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gstreamer/ext/sctp/usrsctp/usrsctplib/netinet/sctp_input.c
Tim-Philipp Müller f4538e24b6 sctp: import internal copy of usrsctp library 
There are problems with global shared state and no API stability
guarantees, and we can't rely on distros shipping the fixes we
need. Both firefox and Chrome bundle their own copies too.

Imported from https://github.com/sctplab/usrsctp,
commit 547d3b46c64876c0336b9eef297fda58dbe1adaf
Date: Thu Jul 23 21:49:32 2020 +0200

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/870

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1465>
2020-08-14 01:32:45 +01:00

6427 lines
205 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 363194 2020-07-14 20:32:50Z tuexen $");
#endif
#include <netinet/sctp_os.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_crc32.h>
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <netinet/sctp_kdtrace.h>
#endif
#if defined(INET) || defined(INET6)
#if !defined(_WIN32)
#include <netinet/udp.h>
#endif
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/smp.h>
#endif
static void
sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
{
struct sctp_nets *net;
/* This now not only stops all cookie timers
* it also stops any INIT timers as well. This
* will make sure that the timers are stopped in
* all collision cases.
*/
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
stcb->sctp_ep,
stcb,
net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
} else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
stcb->sctp_ep,
stcb,
net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
}
}
}
/* INIT handler */
static void
sctp_handle_init(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id, uint16_t port)
{
struct sctp_init *init;
struct mbuf *op_err;
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
(void *)stcb);
if (stcb == NULL) {
SCTP_INP_RLOCK(inp);
}
/* validate length */
if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
/* validate parameters */
init = &cp->init;
if (init->initiate_tag == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
/* invalid parameter... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (init->num_inbound_streams == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (init->num_outbound_streams == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
offset + ntohs(cp->ch.chunk_length))) {
/* auth parameter(s) error... send abort */
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Problem with AUTH parameters");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
/* We are only accepting if we have a listening socket.*/
if ((stcb == NULL) &&
((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
(!SCTP_IS_LISTENING(inp)))) {
/*
* FIX ME ?? What about TCP model and we have a
* match/restart case? Actually no fix is needed.
* the lookup will always find the existing assoc so stcb
* would not be NULL. It may be questionable to do this
* since we COULD just send back the INIT-ACK and hope that
* the app did accept()'s by the time the COOKIE was sent. But
* there is a price to pay for COOKIE generation and I don't
* want to pay it on the chance that the app will actually do
* some accepts(). The App just looses and should NOT be in
* this state :-)
*/
if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"No listener");
sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, port);
}
goto outnow;
}
if ((stcb != NULL) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
sctp_send_shutdown_ack(stcb, NULL);
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
} else {
SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
src, dst, sh, cp,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
}
outnow:
if (stcb == NULL) {
SCTP_INP_RUNLOCK(inp);
}
}
/*
* process peer "INIT/INIT-ACK" chunk returns value < 0 on error
*/
int
sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
{
int unsent_data;
unsigned int i;
struct sctp_stream_queue_pending *sp;
struct sctp_association *asoc;
/* This function returns if any stream has true unsent data on it.
* Note that as it looks through it will clean up any places that
* have old data that has been sent but left at top of stream queue.
*/
asoc = &stcb->asoc;
unsent_data = 0;
SCTP_TCB_SEND_LOCK(stcb);
if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
/* Check to see if some data queued */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
/*sa_ignore FREED_MEMORY*/
sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
if (sp == NULL) {
continue;
}
if ((sp->msg_is_complete) &&
(sp->length == 0) &&
(sp->sender_all_done)) {
/* We are doing differed cleanup. Last
* time through when we took all the data
* the sender_all_done was not set.
*/
if (sp->put_last_out == 0) {
SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
sp->sender_all_done,
sp->length,
sp->msg_is_complete,
sp->put_last_out);
}
atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
if (sp->net) {
sctp_free_remote_addr(sp->net);
sp->net = NULL;
}
if (sp->data) {
sctp_m_freem(sp->data);
sp->data = NULL;
}
sctp_free_a_strmoq(stcb, sp, so_locked);
if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
unsent_data++;
}
} else {
unsent_data++;
}
if (unsent_data > 0) {
break;
}
}
}
SCTP_TCB_SEND_UNLOCK(stcb);
return (unsent_data);
}
static int
sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
{
struct sctp_init *init;
struct sctp_association *asoc;
struct sctp_nets *lnet;
unsigned int i;
init = &cp->init;
asoc = &stcb->asoc;
/* save off parameters */
asoc->peer_vtag = ntohl(init->initiate_tag);
asoc->peers_rwnd = ntohl(init->a_rwnd);
/* init tsn's */
asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
if (!TAILQ_EMPTY(&asoc->nets)) {
/* update any ssthresh's that may have a default */
TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
lnet->ssthresh = asoc->peers_rwnd;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
}
}
}
SCTP_TCB_SEND_LOCK(stcb);
if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
unsigned int newcnt;
struct sctp_stream_out *outs;
struct sctp_stream_queue_pending *sp, *nsp;
struct sctp_tmit_chunk *chk, *nchk;
/* abandon the upper streams */
newcnt = ntohs(init->num_inbound_streams);
TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
if (chk->rec.data.sid >= newcnt) {
TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
asoc->send_queue_cnt--;
if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
#ifdef INVARIANTS
} else {
panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
#endif
}
if (chk->data != NULL) {
sctp_free_bufspace(stcb, asoc, chk, 1);
sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
0, chk, SCTP_SO_NOT_LOCKED);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
/*sa_ignore FREED_MEMORY*/
}
}
if (asoc->strmout) {
for (i = newcnt; i < asoc->pre_open_streams; i++) {
outs = &asoc->strmout[i];
TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
TAILQ_REMOVE(&outs->outqueue, sp, next);
stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
stcb, 0, sp, SCTP_SO_NOT_LOCKED);
if (sp->data) {
sctp_m_freem(sp->data);
sp->data = NULL;
}
if (sp->net) {
sctp_free_remote_addr(sp->net);
sp->net = NULL;
}
/* Free the chunk */
sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
/*sa_ignore FREED_MEMORY*/
}
outs->state = SCTP_STREAM_CLOSED;
}
}
/* cut back the count */
asoc->pre_open_streams = newcnt;
}
SCTP_TCB_SEND_UNLOCK(stcb);
asoc->streamoutcnt = asoc->pre_open_streams;
if (asoc->strmout) {
for (i = 0; i < asoc->streamoutcnt; i++) {
asoc->strmout[i].state = SCTP_STREAM_OPEN;
}
}
/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
/* This is the next one we expect */
asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
/* open the requested streams */
if (asoc->strmin != NULL) {
/* Free the old ones */
for (i = 0; i < asoc->streamincnt; i++) {
sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
}
SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
}
if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
asoc->streamincnt = ntohs(init->num_outbound_streams);
} else {
asoc->streamincnt = asoc->max_inbound_streams;
}
SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
sizeof(struct sctp_stream_in), SCTP_M_STRMI);
if (asoc->strmin == NULL) {
/* we didn't get memory for the streams! */
SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
return (-1);
}
for (i = 0; i < asoc->streamincnt; i++) {
asoc->strmin[i].sid = i;
asoc->strmin[i].last_mid_delivered = 0xffffffff;
TAILQ_INIT(&asoc->strmin[i].inqueue);
TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
asoc->strmin[i].pd_api_started = 0;
asoc->strmin[i].delivery_started = 0;
}
/*
* load_address_from_init will put the addresses into the
* association when the COOKIE is processed or the INIT-ACK is
* processed. Both types of COOKIE's existing and new call this
* routine. It will remove addresses that are no longer in the
* association (for the restarting case where addresses are
* removed). Up front when the INIT arrives we will discard it if it
* is a restart and new addresses have been added.
*/
/* sa_ignore MEMLEAK */
return (0);
}
/*
* INIT-ACK message processing/consumption returns value < 0 on error
*/
static int
sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
struct sctp_nets *net, int *abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id)
{
struct sctp_association *asoc;
struct mbuf *op_err;
int retval, abort_flag, cookie_found;
int initack_limit;
int nat_friendly = 0;
/* First verify that we have no illegal param's */
abort_flag = 0;
cookie_found = 0;
op_err = sctp_arethere_unrecognized_parameters(m,
(offset + sizeof(struct sctp_init_chunk)),
&abort_flag, (struct sctp_chunkhdr *)cp,
&nat_friendly, &cookie_found);
if (abort_flag) {
/* Send an abort and notify peer */
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_no_unlock = 1;
return (-1);
}
if (!cookie_found) {
uint16_t len;
/* Only report the missing cookie parameter */
if (op_err != NULL) {
sctp_m_freem(op_err);
}
len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
/* We abort with an error of missing mandatory param */
op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
struct sctp_error_missing_param *cause;
SCTP_BUF_LEN(op_err) = len;
cause = mtod(op_err, struct sctp_error_missing_param *);
/* Subtract the reserved param */
cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
cause->cause.length = htons(len);
cause->num_missing_params = htonl(1);
cause->type[0] = htons(SCTP_STATE_COOKIE);
}
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-3);
}
asoc = &stcb->asoc;
asoc->peer_supports_nat = (uint8_t)nat_friendly;
/* process the peer's parameters in the INIT-ACK */
retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
if (retval < 0) {
if (op_err != NULL) {
sctp_m_freem(op_err);
}
return (retval);
}
initack_limit = offset + ntohs(cp->ch.chunk_length);
/* load all addresses */
if ((retval = sctp_load_addresses_from_init(stcb, m,
(offset + sizeof(struct sctp_init_chunk)), initack_limit,
src, dst, NULL, stcb->asoc.port))) {
if (op_err != NULL) {
sctp_m_freem(op_err);
}
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Problem with address parameters");
SCTPDBG(SCTP_DEBUG_INPUT1,
"Load addresses from INIT causes an abort %d\n",
retval);
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
/* if the peer doesn't support asconf, flush the asconf queue */
if (asoc->asconf_supported == 0) {
struct sctp_asconf_addr *param, *nparam;
TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
TAILQ_REMOVE(&asoc->asconf_queue, param, next);
SCTP_FREE(param, SCTP_M_ASC_ADDR);
}
}
stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
stcb->asoc.local_hmacs);
if (op_err) {
sctp_queue_op_err(stcb, op_err);
/* queuing will steal away the mbuf chain to the out queue */
op_err = NULL;
}
/* extract the cookie and queue it to "echo" it back... */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
net->error_count = 0;
/*
* Cancel the INIT timer, We do this first before queueing the
* cookie. We always cancel at the primary to assue that we are
* canceling the timer started by the INIT which always goes to the
* primary.
*/
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
/* calculate the RTO */
sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
SCTP_RTT_FROM_NON_DATA);
#if defined(__Userspace__)
if (stcb->sctp_ep->recv_callback) {
if (stcb->sctp_socket) {
uint32_t inqueue_bytes, sb_free_now;
struct sctp_inpcb *inp;
inp = stcb->sctp_ep;
inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv);
/* check if the amount free in the send socket buffer crossed the threshold */
if (inp->send_callback &&
(((inp->send_sb_threshold > 0) &&
(sb_free_now >= inp->send_sb_threshold) &&
(stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) ||
(inp->send_sb_threshold == 0))) {
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
inp->send_callback(stcb->sctp_socket, sb_free_now);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
}
}
}
#endif
retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
return (retval);
}
static void
sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
union sctp_sockstore store;
struct sctp_nets *r_net, *f_net;
struct timeval tv;
int req_prim = 0;
uint16_t old_error_counter;
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
/* Invalid length */
return;
}
memset(&store, 0, sizeof(store));
switch (cp->heartbeat.hb_info.addr_family) {
#ifdef INET
case AF_INET:
if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
#ifdef HAVE_SIN_LEN
store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
#endif
store.sin.sin_port = stcb->rport;
memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
sizeof(store.sin.sin_addr));
} else {
return;
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
#ifdef HAVE_SIN6_LEN
store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
#endif
store.sin6.sin6_port = stcb->rport;
memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
} else {
return;
}
break;
#endif
#if defined(__Userspace__)
case AF_CONN:
if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family;
#ifdef HAVE_SCONN_LEN
store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len;
#endif
store.sconn.sconn_port = stcb->rport;
memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *));
} else {
return;
}
break;
#endif
default:
return;
}
r_net = sctp_findnet(stcb, &store.sa);
if (r_net == NULL) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
return;
}
if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
(r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
(r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
/*
* If the its a HB and it's random value is correct when can
* confirm the destination.
*/
r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
stcb->asoc.primary_destination = r_net;
r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
f_net = TAILQ_FIRST(&stcb->asoc.nets);
if (f_net != r_net) {
/* first one on the list is NOT the primary
* sctp_cmpaddr() is much more efficient if
* the primary is the first on the list, make it
* so.
*/
TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
}
req_prim = 1;
}
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
old_error_counter = r_net->error_count;
r_net->error_count = 0;
r_net->hb_responded = 1;
tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
/* Now lets do a RTO with this */
sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
SCTP_RTT_FROM_NON_DATA);
if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
r_net->dest_state |= SCTP_ADDR_REACHABLE;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
0, (void *)r_net, SCTP_SO_NOT_LOCKED);
}
if (r_net->dest_state & SCTP_ADDR_PF) {
r_net->dest_state &= ~SCTP_ADDR_PF;
stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
}
if (old_error_counter > 0) {
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
}
if (r_net == stcb->asoc.primary_destination) {
if (stcb->asoc.alternate) {
/* release the alternate, primary is good */
sctp_free_remote_addr(stcb->asoc.alternate);
stcb->asoc.alternate = NULL;
}
}
/* Mobility adaptation */
if (req_prim) {
if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_BASE) ||
sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_FASTHANDOFF)) &&
sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_PRIM_DELETED)) {
sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
stcb->sctp_ep, stcb, NULL,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
if (sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_FASTHANDOFF)) {
sctp_assoc_immediate_retrans(stcb,
stcb->asoc.primary_destination);
}
if (sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_BASE)) {
sctp_move_chunks_from_net(stcb,
stcb->asoc.deleted_primary);
}
sctp_delete_prim_timer(stcb->sctp_ep, stcb);
}
}
}
static int
sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
{
/*
* Return 0 means we want you to proceed with the abort
* non-zero means no abort processing.
*/
uint32_t new_vtag;
struct sctpasochead *head;
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_INP_INFO_WLOCK();
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
} else {
return (0);
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
/* generate a new vtag and send init */
LIST_REMOVE(stcb, sctp_asocs);
stcb->asoc.my_vtag = new_vtag;
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
/* put it in the bucket in the vtag hash of assoc's for the system */
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_INP_INFO_WUNLOCK();
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
return (1);
} else {
/* treat like a case where the cookie expired i.e.:
* - dump current cookie.
* - generate a new vtag.
* - resend init.
*/
/* generate a new vtag and send init */
LIST_REMOVE(stcb, sctp_asocs);
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, &stcb->asoc);
stcb->asoc.my_vtag = new_vtag;
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
/* put it in the bucket in the vtag hash of assoc's for the system */
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_INP_INFO_WUNLOCK();
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
return (1);
}
return (0);
}
static int
sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
struct sctp_nets *net)
{
/* return 0 means we want you to proceed with the abort
* non-zero means no abort processing
*/
if (stcb->asoc.auth_supported == 0) {
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
return (0);
}
sctp_asconf_send_nat_state_update(stcb, net);
return (1);
}
/* Returns 1 if the stcb was aborted, 0 otherwise */
static int
sctp_handle_abort(struct sctp_abort_chunk *abort,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
uint16_t len;
uint16_t error;
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
if (stcb == NULL)
return (0);
len = ntohs(abort->ch.chunk_length);
if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
/* Need to check the cause codes for our
* two magic nat aborts which don't kill the assoc
* necessarily.
*/
struct sctp_error_cause *cause;
cause = (struct sctp_error_cause *)(abort + 1);
error = ntohs(cause->code);
if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
abort->ch.chunk_flags);
if (sctp_handle_nat_colliding_state(stcb)) {
return (0);
}
} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
abort->ch.chunk_flags);
if (sctp_handle_nat_missing_state(stcb, net)) {
return (0);
}
}
} else {
error = 0;
}
/* stop any receive timers */
sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
/* notify user of the abort and clean up... */
sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
/* free the tcb */
SCTP_STAT_INCR_COUNTER32(sctps_aborted);
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
#ifdef SCTP_ASOCLOG_OF_TSNS
sctp_print_out_track_log(stcb);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
return (1);
}
static void
sctp_start_net_timers(struct sctp_tcb *stcb)
{
uint32_t cnt_hb_sent;
struct sctp_nets *net;
cnt_hb_sent = 0;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
/* For each network start:
* 1) A pmtu timer.
* 2) A HB timer
* 3) If the dest in unconfirmed send
* a hb as well if under max_hb_burst have
* been sent.
*/
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
(cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
cnt_hb_sent++;
}
}
if (cnt_hb_sent) {
sctp_chunk_output(stcb->sctp_ep, stcb,
SCTP_OUTPUT_FROM_COOKIE_ACK,
SCTP_SO_NOT_LOCKED);
}
}
static void
sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
{
struct sctp_association *asoc;
int some_on_streamwheel;
int old_state;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown: handling SHUTDOWN\n");
if (stcb == NULL)
return;
asoc = &stcb->asoc;
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
return;
}
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
/* Shutdown NOT the expected size */
return;
}
old_state = SCTP_GET_STATE(stcb);
sctp_update_acked(stcb, cp, abort_flag);
if (*abort_flag) {
return;
}
if (asoc->control_pdapi) {
/* With a normal shutdown
* we assume the end of last record.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
if (asoc->control_pdapi->on_strm_q) {
struct sctp_stream_in *strm;
strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
/* Unordered */
TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
asoc->control_pdapi->on_strm_q = 0;
} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
/* Ordered */
TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
asoc->control_pdapi->on_strm_q = 0;
#ifdef INVARIANTS
} else {
panic("Unknown state on ctrl:%p on_strm_q:%d",
asoc->control_pdapi,
asoc->control_pdapi->on_strm_q);
#endif
}
}
asoc->control_pdapi->end_added = 1;
asoc->control_pdapi->pdapi_aborted = 1;
asoc->control_pdapi = NULL;
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* assoc was freed while we were unlocked */
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
if (stcb->sctp_socket) {
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
/* goto SHUTDOWN_RECEIVED state to block new requests */
if (stcb->sctp_socket) {
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
/* notify upper layer that peer has initiated a shutdown */
sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
/* reset time */
(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
}
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
/*
* stop the shutdown timer, since we WILL move to
* SHUTDOWN-ACK-SENT.
*/
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
}
/* Now is there unsent data on a stream somewhere? */
some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
if (!TAILQ_EMPTY(&asoc->send_queue) ||
!TAILQ_EMPTY(&asoc->sent_queue) ||
some_on_streamwheel) {
/* By returning we will push more data out */
return;
} else {
/* no outstanding data to send, so move on... */
/* send SHUTDOWN-ACK */
/* move to SHUTDOWN-ACK-SENT state */
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
sctp_stop_timers_for_shutdown(stcb);
sctp_send_shutdown_ack(stcb, net);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, net);
} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
sctp_send_shutdown_ack(stcb, net);
}
}
}
static void
sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
struct sctp_association *asoc;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
so = SCTP_INP_SO(stcb->sctp_ep);
#endif
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
if (stcb == NULL)
return;
asoc = &stcb->asoc;
/* process according to association state */
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
/* unexpected SHUTDOWN-ACK... do OOTB handling... */
sctp_send_shutdown_complete(stcb, net, 1);
SCTP_TCB_UNLOCK(stcb);
return;
}
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
/* unexpected SHUTDOWN-ACK... so ignore... */
SCTP_TCB_UNLOCK(stcb);
return;
}
if (asoc->control_pdapi) {
/* With a normal shutdown
* we assume the end of last record.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
asoc->control_pdapi->end_added = 1;
asoc->control_pdapi->pdapi_aborted = 1;
asoc->control_pdapi = NULL;
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* assoc was freed while we were unlocked */
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
#ifdef INVARIANTS
if (!TAILQ_EMPTY(&asoc->send_queue) ||
!TAILQ_EMPTY(&asoc->sent_queue) ||
sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
panic("Queues are not empty when handling SHUTDOWN-ACK");
}
#endif
/* stop the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
/* send SHUTDOWN-COMPLETE */
sctp_send_shutdown_complete(stcb, net, 0);
/* notify upper layer protocol */
if (stcb->sctp_socket) {
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
stcb->sctp_socket->so_snd.sb_cc = 0;
}
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
/* free the TCB but first save off the ep */
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
static void
sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
{
switch (chunk_type) {
case SCTP_ASCONF_ACK:
case SCTP_ASCONF:
sctp_asconf_cleanup(stcb);
break;
case SCTP_IFORWARD_CUM_TSN:
case SCTP_FORWARD_CUM_TSN:
stcb->asoc.prsctp_supported = 0;
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT2,
"Peer does not support chunk type %d (0x%x).\n",
chunk_type, chunk_type);
break;
}
}
/*
* Skip past the param header and then we will find the param that caused the
* problem. There are a number of param's in a ASCONF OR the prsctp param
* these will turn of specific features.
* XXX: Is this the right thing to do?
*/
static void
sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
{
switch (parameter_type) {
/* pr-sctp draft */
case SCTP_PRSCTP_SUPPORTED:
stcb->asoc.prsctp_supported = 0;
break;
case SCTP_SUPPORTED_CHUNK_EXT:
break;
/* draft-ietf-tsvwg-addip-sctp */
case SCTP_HAS_NAT_SUPPORT:
stcb->asoc.peer_supports_nat = 0;
break;
case SCTP_ADD_IP_ADDRESS:
case SCTP_DEL_IP_ADDRESS:
case SCTP_SET_PRIM_ADDR:
stcb->asoc.asconf_supported = 0;
break;
case SCTP_SUCCESS_REPORT:
case SCTP_ERROR_CAUSE_IND:
SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
SCTPDBG(SCTP_DEBUG_INPUT2,
"Turning off ASCONF to this strange peer\n");
stcb->asoc.asconf_supported = 0;
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT2,
"Peer does not support param type %d (0x%x)??\n",
parameter_type, parameter_type);
break;
}
}
static int
sctp_handle_error(struct sctp_chunkhdr *ch,
struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
{
struct sctp_error_cause *cause;
struct sctp_association *asoc;
uint32_t remaining_length, adjust;
uint16_t code, cause_code, cause_length;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
/* parse through all of the errors and process */
asoc = &stcb->asoc;
cause = (struct sctp_error_cause *)((caddr_t)ch +
sizeof(struct sctp_chunkhdr));
remaining_length = ntohs(ch->chunk_length);
if (remaining_length > limit) {
remaining_length = limit;
}
if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
remaining_length -= sizeof(struct sctp_chunkhdr);
} else {
remaining_length = 0;
}
code = 0;
while (remaining_length >= sizeof(struct sctp_error_cause)) {
/* Process an Error Cause */
cause_code = ntohs(cause->code);
cause_length = ntohs(cause->length);
if ((cause_length > remaining_length) || (cause_length == 0)) {
/* Invalid cause length, possibly due to truncation. */
SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
remaining_length, cause_length);
return (0);
}
if (code == 0) {
/* report the first error cause */
code = cause_code;
}
switch (cause_code) {
case SCTP_CAUSE_INVALID_STREAM:
case SCTP_CAUSE_MISSING_PARAM:
case SCTP_CAUSE_INVALID_PARAM:
case SCTP_CAUSE_NO_USER_DATA:
SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
cause_code);
break;
case SCTP_CAUSE_NAT_COLLIDING_STATE:
SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
ch->chunk_flags);
if (sctp_handle_nat_colliding_state(stcb)) {
return (0);
}
break;
case SCTP_CAUSE_NAT_MISSING_STATE:
SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
ch->chunk_flags);
if (sctp_handle_nat_missing_state(stcb, net)) {
return (0);
}
break;
case SCTP_CAUSE_STALE_COOKIE:
/*
* We only act if we have echoed a cookie and are
* waiting.
*/
if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
struct sctp_error_stale_cookie *stale_cookie;
stale_cookie = (struct sctp_error_stale_cookie *)cause;
asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
/* Double it to be more robust on RTX */
if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
asoc->cookie_preserve_req *= 2;
} else {
asoc->cookie_preserve_req = UINT32_MAX;
}
asoc->stale_cookie_count++;
if (asoc->stale_cookie_count >
asoc->max_init_times) {
sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
/* now free the asoc */
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (-1);
}
/* blast back to INIT state */
sctp_toss_old_cookies(stcb, &stcb->asoc);
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
sctp_stop_all_cookie_timers(stcb);
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
}
break;
case SCTP_CAUSE_UNRESOLVABLE_ADDR:
/*
* Nothing we can do here, we don't do hostname
* addresses so if the peer does not like my IPv6
* (or IPv4 for that matter) it does not matter. If
* they don't support that type of address, they can
* NOT possibly get that packet type... i.e. with no
* IPv6 you can't receive a IPv6 packet. so we can
* safely ignore this one. If we ever added support
* for HOSTNAME Addresses, then we would need to do
* something here.
*/
break;
case SCTP_CAUSE_UNRECOG_CHUNK:
if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
struct sctp_error_unrecognized_chunk *unrec_chunk;
unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
}
break;
case SCTP_CAUSE_UNRECOG_PARAM:
/* XXX: We only consider the first parameter */
if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
struct sctp_paramhdr *unrec_parameter;
unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
}
break;
case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
/*
* We ignore this since the timer will drive out a
* new cookie anyway and there timer will drive us
* to send a SHUTDOWN_COMPLETE. We can't send one
* here since we don't have their tag.
*/
break;
case SCTP_CAUSE_DELETING_LAST_ADDR:
case SCTP_CAUSE_RESOURCE_SHORTAGE:
case SCTP_CAUSE_DELETING_SRC_ADDR:
/*
* We should NOT get these here, but in a
* ASCONF-ACK.
*/
SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
cause_code);
break;
case SCTP_CAUSE_OUT_OF_RESC:
/*
* And what, pray tell do we do with the fact that
* the peer is out of resources? Not really sure we
* could do anything but abort. I suspect this
* should have came WITH an abort instead of in a
* OP-ERROR.
*/
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
cause_code);
break;
}
adjust = SCTP_SIZE32(cause_length);
if (remaining_length >= adjust) {
remaining_length -= adjust;
} else {
remaining_length = 0;
}
cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
}
sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
return (0);
}
static int
sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
struct sctp_nets *net, int *abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id)
{
struct sctp_init_ack *init_ack;
struct mbuf *op_err;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_init_ack: handling INIT-ACK\n");
if (stcb == NULL) {
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_init_ack: TCB is null\n");
return (-1);
}
if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
/* Invalid length */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
init_ack = &cp->init;
/* validate parameters */
if (init_ack->initiate_tag == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (init_ack->num_inbound_streams == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (init_ack->num_outbound_streams == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
/* process according to association state... */
switch (SCTP_GET_STATE(stcb)) {
case SCTP_STATE_COOKIE_WAIT:
/* this is the expected state for this chunk */
/* process the INIT-ACK parameters */
if (stcb->asoc.primary_destination->dest_state &
SCTP_ADDR_UNCONFIRMED) {
/*
* The primary is where we sent the INIT, we can
* always consider it confirmed when the INIT-ACK is
* returned. Do this before we load addresses
* though.
*/
stcb->asoc.primary_destination->dest_state &=
~SCTP_ADDR_UNCONFIRMED;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
}
if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
net, abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id) < 0) {
/* error in parsing parameters */
return (-1);
}
/* update our state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
/* reset the RTO calc */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
/*
* collapse the init timer back in case of a exponential
* backoff
*/
sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
stcb, net);
/*
* the send at the end of the inbound data processing will
* cause the cookie to be sent
*/
break;
case SCTP_STATE_SHUTDOWN_SENT:
/* incorrect state... discard */
break;
case SCTP_STATE_COOKIE_ECHOED:
/* incorrect state... discard */
break;
case SCTP_STATE_OPEN:
/* incorrect state... discard */
break;
case SCTP_STATE_EMPTY:
case SCTP_STATE_INUSE:
default:
/* incorrect state... discard */
return (-1);
break;
}
SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
return (0);
}
static struct sctp_tcb *
sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
struct sctp_inpcb *inp, struct sctp_nets **netp,
struct sockaddr *init_src, int *notification,
int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id, uint16_t port);
/*
* handle a state cookie for an existing association m: input packet mbuf
* chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
* "split" mbuf and the cookie signature does not exist offset: offset into
* mbuf to the cookie-echo chunk
*/
static struct sctp_tcb *
sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
struct sockaddr *init_src, int *notification,
int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id, uint16_t port)
{
struct sctp_association *asoc;
struct sctp_init_chunk *init_cp, init_buf;
struct sctp_init_ack_chunk *initack_cp, initack_buf;
struct sctp_nets *net;
struct mbuf *op_err;
struct timeval old;
int init_offset, initack_offset, i;
int retval;
int spec_flag = 0;
uint32_t how_indx;
#if defined(SCTP_DETAILED_STR_STATS)
int j;
#endif
net = *netp;
/* I know that the TCB is non-NULL from the caller */
asoc = &stcb->asoc;
for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
if (asoc->cookie_how[how_indx] == 0)
break;
}
if (how_indx < sizeof(asoc->cookie_how)) {
asoc->cookie_how[how_indx] = 1;
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
/* SHUTDOWN came in after sending INIT-ACK */
sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, net->port);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 2;
return (NULL);
}
/*
* find and validate the INIT chunk in the cookie (peer's info) the
* INIT should start after the cookie-echo header struct (chunk
* header, state cookie header struct)
*/
init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
init_cp = (struct sctp_init_chunk *)
sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
(uint8_t *) & init_buf);
if (init_cp == NULL) {
/* could not pull a INIT chunk in cookie */
return (NULL);
}
if (init_cp->ch.chunk_type != SCTP_INITIATION) {
return (NULL);
}
/*
* find and validate the INIT-ACK chunk in the cookie (my info) the
* INIT-ACK follows the INIT chunk
*/
initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
initack_cp = (struct sctp_init_ack_chunk *)
sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
(uint8_t *) & initack_buf);
if (initack_cp == NULL) {
/* could not pull INIT-ACK chunk in cookie */
return (NULL);
}
if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
return (NULL);
}
if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
(ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
/*
* case D in Section 5.2.4 Table 2: MMAA process accordingly
* to get into the OPEN state
*/
if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
/*-
* Opps, this means that we somehow generated two vtag's
* the same. I.e. we did:
* Us Peer
* <---INIT(tag=a)------
* ----INIT-ACK(tag=t)-->
* ----INIT(tag=t)------> *1
* <---INIT-ACK(tag=a)---
* <----CE(tag=t)------------- *2
*
* At point *1 we should be generating a different
* tag t'. Which means we would throw away the CE and send
* ours instead. Basically this is case C (throw away side).
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 17;
return (NULL);
}
switch (SCTP_GET_STATE(stcb)) {
case SCTP_STATE_COOKIE_WAIT:
case SCTP_STATE_COOKIE_ECHOED:
/*
* INIT was sent but got a COOKIE_ECHO with the
* correct tags... just accept it...but we must
* process the init so that we can make sure we
* have the right seq no's.
*/
/* First we must process the INIT !! */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 3;
return (NULL);
}
/* we have already processed the INIT so no problem */
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
/* update current state */
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
else
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
sctp_stop_all_cookie_timers(stcb);
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
(!SCTP_IS_LISTENING(inp))) {
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
/*
* Here is where collision would go if we
* did a connect() and instead got a
* init/init-ack/cookie done before the
* init-ack came back..
*/
stcb->sctp_ep->sctp_flags |=
SCTP_PCB_FLAGS_CONNECTED;
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_add_int(&stcb->asoc.refcnt, -1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
SCTP_SOCKET_UNLOCK(so, 1);
return (NULL);
}
#endif
soisconnected(stcb->sctp_socket);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
/* notify upper layer */
*notification = SCTP_NOTIFY_ASSOC_UP;
/*
* since we did not send a HB make sure we
* don't double things
*/
old.tv_sec = cookie->time_entered.tv_sec;
old.tv_usec = cookie->time_entered.tv_usec;
net->hb_responded = 1;
sctp_calculate_rto(stcb, asoc, net, &old,
SCTP_RTT_FROM_NON_DATA);
if (stcb->asoc.sctp_autoclose_ticks &&
(sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
inp, stcb, NULL);
}
break;
default:
/*
* we're in the OPEN state (or beyond), so
* peer must have simply lost the COOKIE-ACK
*/
break;
} /* end switch */
sctp_stop_all_cookie_timers(stcb);
/*
* We ignore the return code here.. not sure if we should
* somehow abort.. but we do have an existing asoc. This
* really should not fail.
*/
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 4;
return (NULL);
}
/* respond with a COOKIE-ACK */
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 5;
return (stcb);
}
if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
cookie->tie_tag_my_vtag == 0 &&
cookie->tie_tag_peer_vtag == 0) {
/*
* case C in Section 5.2.4 Table 2: XMOO silently discard
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 6;
return (NULL);
}
/* If nat support, and the below and stcb is established,
* send back a ABORT(colliding state) if we are established.
*/
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
(asoc->peer_supports_nat) &&
((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
(asoc->peer_vtag == 0)))) {
/* Special case - Peer's support nat. We may have
* two init's that we gave out the same tag on since
* one was not established.. i.e. we get INIT from host-1
* behind the nat and we respond tag-a, we get a INIT from
* host-2 behind the nat and we get tag-a again. Then we
* bring up host-1 (or 2's) assoc, Then comes the cookie
* from hsot-2 (or 1). Now we have colliding state. We must
* send an abort here with colliding state indication.
*/
op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, port);
return (NULL);
}
if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
(asoc->peer_vtag == 0))) {
/*
* case B in Section 5.2.4 Table 2: MXAA or MOAA my info
* should be ok, re-accept peer info
*/
if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
/* Extension of case C.
* If we hit this, then the random number
* generator returned the same vtag when we
* first sent our INIT-ACK and when we later sent
* our INIT. The side with the seq numbers that are
* different will be the one that normnally would
* have hit case C. This in effect "extends" our vtags
* in this collision case to be 64 bits. The same collision
* could occur aka you get both vtag and seq number the
* same twice in a row.. but is much less likely. If it
* did happen then we would proceed through and bring
* up the assoc.. we may end up with the wrong stream
* setup however.. which would be bad.. but there is
* no way to tell.. until we send on a stream that does
* not exist :-)
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 7;
return (NULL);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 8;
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
sctp_stop_all_cookie_timers(stcb);
/*
* since we did not send a HB make sure we don't double
* things
*/
net->hb_responded = 1;
if (stcb->asoc.sctp_autoclose_ticks &&
sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
NULL);
}
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
/* Ok the peer probably discarded our
* data (if we echoed a cookie+data). So anything
* on the sent_queue should be marked for
* retransmit, we may not get something to
* kick us so it COULD still take a timeout
* to move these.. but it can't hurt to mark them.
*/
struct sctp_tmit_chunk *chk;
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if (chk->sent < SCTP_DATAGRAM_RESEND) {
chk->sent = SCTP_DATAGRAM_RESEND;
sctp_flight_size_decrease(chk);
sctp_total_flight_decrease(stcb, chk);
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
spec_flag++;
}
}
}
/* process the INIT info (peer's info) */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 9;
return (NULL);
}
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 10;
return (NULL);
}
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
*notification = SCTP_NOTIFY_ASSOC_UP;
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
(!SCTP_IS_LISTENING(inp))) {
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
stcb->sctp_ep->sctp_flags |=
SCTP_PCB_FLAGS_CONNECTED;
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_add_int(&stcb->asoc.refcnt, -1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
SCTP_SOCKET_UNLOCK(so, 1);
return (NULL);
}
#endif
soisconnected(stcb->sctp_socket);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
else
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
} else {
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
}
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (spec_flag) {
/* only if we have retrans set do we do this. What
* this call does is get only the COOKIE-ACK out
* and then when we return the normal call to
* sctp_chunk_output will get the retrans out
* behind this.
*/
sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 11;
return (stcb);
}
if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
cookie->tie_tag_peer_vtag != 0) {
struct sctpasochead *head;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
if (asoc->peer_supports_nat) {
/* This is a gross gross hack.
* Just call the cookie_new code since we
* are allowing a duplicate association.
* I hope this works...
*/
return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
sh, cookie, cookie_len,
inp, netp, init_src,notification,
auth_skipped, auth_offset, auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port));
}
/*
* case A in Section 5.2.4 Table 2: XXMM (peer restarted)
*/
/* temp code */
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 12;
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
/* notify upper layer */
*notification = SCTP_NOTIFY_ASSOC_RESTART;
atomic_add_int(&stcb->asoc.refcnt, 1);
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
}
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
/* move to OPEN state, if not in SHUTDOWN_SENT */
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
}
asoc->pre_open_streams =
ntohs(initack_cp->init.num_outbound_streams);
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
asoc->str_reset_seq_in = asoc->init_seq_number;
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
if (asoc->mapping_array) {
memset(asoc->mapping_array, 0,
asoc->mapping_array_size);
}
if (asoc->nr_mapping_array) {
memset(asoc->nr_mapping_array, 0,
asoc->mapping_array_size);
}
SCTP_TCB_UNLOCK(stcb);
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
SCTP_SOCKET_LOCK(so, 1);
#endif
SCTP_INP_INFO_WLOCK();
SCTP_INP_WLOCK(stcb->sctp_ep);
SCTP_TCB_LOCK(stcb);
atomic_add_int(&stcb->asoc.refcnt, -1);
/* send up all the data */
SCTP_TCB_SEND_LOCK(stcb);
sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].chunks_on_queues = 0;
#if defined(SCTP_DETAILED_STR_STATS)
for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
asoc->strmout[i].abandoned_sent[j] = 0;
asoc->strmout[i].abandoned_unsent[j] = 0;
}
#else
asoc->strmout[i].abandoned_sent[0] = 0;
asoc->strmout[i].abandoned_unsent[0] = 0;
#endif
stcb->asoc.strmout[i].sid = i;
stcb->asoc.strmout[i].next_mid_ordered = 0;
stcb->asoc.strmout[i].next_mid_unordered = 0;
stcb->asoc.strmout[i].last_msg_incomplete = 0;
}
/* process the INIT-ACK info (my info) */
asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
/* pull from vtag hash */
LIST_REMOVE(stcb, sctp_asocs);
/* re-insert to new vtag position */
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
SCTP_BASE_INFO(hashasocmark))];
/*
* put it in the bucket in the vtag hash of assoc's for the
* system
*/
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_TCB_SEND_UNLOCK(stcb);
SCTP_INP_WUNLOCK(stcb->sctp_ep);
SCTP_INP_INFO_WUNLOCK();
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
asoc->total_flight = 0;
asoc->total_flight_count = 0;
/* process the INIT info (peer's info) */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 13;
return (NULL);
}
/*
* since we did not send a HB make sure we don't double
* things
*/
net->hb_responded = 1;
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 14;
return (NULL);
}
/* respond with a COOKIE-ACK */
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 15;
return (stcb);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 16;
/* all other cases... */
return (NULL);
}
/*
* handle a state cookie for a new association m: input packet mbuf chain--
* assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
* and the cookie signature does not exist offset: offset into mbuf to the
* cookie-echo chunk length: length of the cookie chunk to: where the init
* was from returns a new TCB
*/
static struct sctp_tcb *
sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
struct sctp_inpcb *inp, struct sctp_nets **netp,
struct sockaddr *init_src, int *notification,
int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id, uint16_t port)
{
struct sctp_tcb *stcb;
struct sctp_init_chunk *init_cp, init_buf;
struct sctp_init_ack_chunk *initack_cp, initack_buf;
union sctp_sockstore store;
struct sctp_association *asoc;
int init_offset, initack_offset, initack_limit;
int retval;
int error = 0;
uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
so = SCTP_INP_SO(inp);
#endif
/*
* find and validate the INIT chunk in the cookie (peer's info) the
* INIT should start after the cookie-echo header struct (chunk
* header, state cookie header struct)
*/
init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
init_cp = (struct sctp_init_chunk *)
sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
(uint8_t *) & init_buf);
if (init_cp == NULL) {
/* could not pull a INIT chunk in cookie */
SCTPDBG(SCTP_DEBUG_INPUT1,
"process_cookie_new: could not pull INIT chunk hdr\n");
return (NULL);
}
if (init_cp->ch.chunk_type != SCTP_INITIATION) {
SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
return (NULL);
}
initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
/*
* find and validate the INIT-ACK chunk in the cookie (my info) the
* INIT-ACK follows the INIT chunk
*/
initack_cp = (struct sctp_init_ack_chunk *)
sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
(uint8_t *) & initack_buf);
if (initack_cp == NULL) {
/* could not pull INIT-ACK chunk in cookie */
SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
return (NULL);
}
if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
return (NULL);
}
/*
* NOTE: We can't use the INIT_ACK's chk_length to determine the
* "initack_limit" value. This is because the chk_length field
* includes the length of the cookie, but the cookie is omitted when
* the INIT and INIT_ACK are tacked onto the cookie...
*/
initack_limit = offset + cookie_len;
/*
* now that we know the INIT/INIT-ACK are in place, create a new TCB
* and popluate
*/
/*
* Here we do a trick, we set in NULL for the proc/thread argument. We
* do this since in effect we only use the p argument when
* the socket is unbound and we must do an implicit bind.
* Since we are getting a cookie, we cannot be unbound.
*/
stcb = sctp_aloc_assoc(inp, init_src, &error,
ntohl(initack_cp->init.initiate_tag), vrf_id,
ntohs(initack_cp->init.num_outbound_streams),
port,
#if defined(__FreeBSD__) && !defined(__Userspace__)
(struct thread *)NULL,
#elif defined(_WIN32) && !defined(__Userspace__)
(PKTHREAD)NULL,
#else
(struct proc *)NULL,
#endif
SCTP_DONT_INITIALIZE_AUTH_PARAMS);
if (stcb == NULL) {
struct mbuf *op_err;
/* memory problem? */
SCTPDBG(SCTP_DEBUG_INPUT1,
"process_cookie_new: no room for another TCB!\n");
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
return (NULL);
}
/* get the correct sctp_nets */
if (netp)
*netp = sctp_findnet(stcb, init_src);
asoc = &stcb->asoc;
/* get scope variables out of cookie */
asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
asoc->scope.site_scope = cookie->site_scope;
asoc->scope.local_scope = cookie->local_scope;
asoc->scope.loopback_scope = cookie->loopback_scope;
#if defined(__Userspace__)
if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
(asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
(asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
#else
if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
(asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
#endif
struct mbuf *op_err;
/*
* Houston we have a problem. The EP changed while the
* cookie was in flight. Only recourse is to abort the
* association.
*/
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (NULL);
}
/* process the INIT-ACK info (my info) */
asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
asoc->str_reset_seq_in = asoc->init_seq_number;
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
/* process the INIT info (peer's info) */
if (netp)
retval = sctp_process_init(init_cp, stcb);
else
retval = 0;
if (retval < 0) {
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (NULL);
}
/* load all addresses */
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk), initack_offset,
src, dst, init_src, port)) {
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (NULL);
}
/*
* verify any preceding AUTH chunk that was skipped
*/
/* pull the local authentication parameters from the cookie/init-ack */
sctp_auth_get_cookie_params(stcb, m,
initack_offset + sizeof(struct sctp_init_ack_chunk),
initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
if (auth_skipped) {
struct sctp_auth_chunk *auth;
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
} else {
auth = NULL;
}
if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
/* auth HMAC failed, dump the assoc and packet */
SCTPDBG(SCTP_DEBUG_AUTH1,
"COOKIE-ECHO: AUTH failed\n");
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (NULL);
} else {
/* remaining chunks checked... good to go */
stcb->asoc.authenticated = 1;
}
}
/*
* if we're doing ASCONFs, check to see if we have any new local
* addresses that need to get added to the peer (eg. addresses
* changed while cookie echo in flight). This needs to be done
* after we go to the OPEN state to do the correct asconf
* processing. else, make sure we have the correct addresses in our
* lists
*/
/* warning, we re-use sin, sin6, sa_store here! */
/* pull in local_address (our "from" address) */
switch (cookie->laddr_type) {
#ifdef INET
case SCTP_IPV4_ADDRESS:
/* source addr is IPv4 */
memset(&store.sin, 0, sizeof(struct sockaddr_in));
store.sin.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
store.sin.sin_len = sizeof(struct sockaddr_in);
#endif
store.sin.sin_addr.s_addr = cookie->laddress[0];
break;
#endif
#ifdef INET6
case SCTP_IPV6_ADDRESS:
/* source addr is IPv6 */
memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
store.sin6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
store.sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
store.sin6.sin6_scope_id = cookie->scope_id;
memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
break;
#endif
#if defined(__Userspace__)
case SCTP_CONN_ADDRESS:
/* source addr is conn */
memset(&store.sconn, 0, sizeof(struct sockaddr_conn));
store.sconn.sconn_family = AF_CONN;
#ifdef HAVE_SCONN_LEN
store.sconn.sconn_len = sizeof(struct sockaddr_conn);
#endif
memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *));
break;
#endif
default:
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (NULL);
}
/* update current state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
sctp_stop_all_cookie_timers(stcb);
SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
/* set up to notify upper layer */
*notification = SCTP_NOTIFY_ASSOC_UP;
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
(!SCTP_IS_LISTENING(inp))) {
/*
* This is an endpoint that called connect() how it got a
* cookie that is NEW is a bit of a mystery. It must be that
* the INIT was sent, but before it got there.. a complete
* INIT/INIT-ACK/COOKIE arrived. But of course then it
* should have went to the other code.. not here.. oh well..
* a bit of protection is worth having..
*/
stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
SCTP_SOCKET_UNLOCK(so, 1);
return (NULL);
}
#endif
soisconnected(stcb->sctp_socket);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(SCTP_IS_LISTENING(inp))) {
/*
* We don't want to do anything with this one. Since it is
* the listening guy. The timer will get started for
* accepted connections in the caller.
*/
;
}
/* since we did not send a HB make sure we don't double things */
if ((netp) && (*netp))
(*netp)->hb_responded = 1;
if (stcb->asoc.sctp_autoclose_ticks &&
sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
}
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
if ((netp != NULL) && (*netp != NULL)) {
struct timeval old;
/* calculate the RTT and set the encaps port */
old.tv_sec = cookie->time_entered.tv_sec;
old.tv_usec = cookie->time_entered.tv_usec;
sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
}
/* respond with a COOKIE-ACK */
sctp_send_cookie_ack(stcb);
/*
* check the address lists for any ASCONFs that need to be sent
* AFTER the cookie-ack is sent
*/
sctp_check_address_list(stcb, m,
initack_offset + sizeof(struct sctp_init_ack_chunk),
initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
&store.sa, cookie->local_scope, cookie->site_scope,
cookie->ipv4_scope, cookie->loopback_scope);
return (stcb);
}
/*
* CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
* we NEED to make sure we are not already using the vtag. If so we
* need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
SCTP_BASE_INFO(hashasocmark))];
LIST_FOREACH(stcb, head, sctp_asocs) {
if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
-- SEND ABORT - TRY AGAIN --
}
}
*/
/*
* handles a COOKIE-ECHO message stcb: modified to either a new or left as
* existing (non-NULL) TCB
*/
static struct mbuf *
sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
struct sctp_tcb **locked_tcb,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid,
#endif
uint32_t vrf_id, uint16_t port)
{
struct sctp_state_cookie *cookie;
struct sctp_tcb *l_stcb = *stcb;
struct sctp_inpcb *l_inp;
struct sockaddr *to;
struct sctp_pcb *ep;
struct mbuf *m_sig;
uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
uint8_t *sig;
uint8_t cookie_ok = 0;
unsigned int sig_offset, cookie_offset;
unsigned int cookie_len;
struct timeval now;
struct timeval time_expires;
int notification = 0;
struct sctp_nets *netl;
int had_a_existing_tcb = 0;
int send_int_conf = 0;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
#if defined(__Userspace__)
struct sockaddr_conn sconn;
#endif
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_cookie: handling COOKIE-ECHO\n");
if (inp_p == NULL) {
return (NULL);
}
cookie = &cp->cookie;
cookie_offset = offset + sizeof(struct sctp_chunkhdr);
cookie_len = ntohs(cp->ch.chunk_length);
if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
sizeof(struct sctp_init_chunk) +
sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
/* cookie too small */
return (NULL);
}
if ((cookie->peerport != sh->src_port) ||
(cookie->myport != sh->dest_port) ||
(cookie->my_vtag != sh->v_tag)) {
/*
* invalid ports or bad tag. Note that we always leave the
* v_tag in the header in network order and when we stored
* it in the my_vtag slot we also left it in network order.
* This maintains the match even though it may be in the
* opposite byte order of the machine :->
*/
return (NULL);
}
#if defined(__Userspace__)
/*
* Recover the AF_CONN addresses within the cookie.
* This needs to be done in the buffer provided for later processing
* of the cookie and in the mbuf chain for HMAC validation.
*/
if ((cookie->addr_type == SCTP_CONN_ADDRESS) && (src->sa_family == AF_CONN)) {
struct sockaddr_conn *sconnp = (struct sockaddr_conn *)src;
memcpy(cookie->address, &sconnp->sconn_addr , sizeof(void *));
m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, address),
(int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
}
if ((cookie->laddr_type == SCTP_CONN_ADDRESS) && (dst->sa_family == AF_CONN)) {
struct sockaddr_conn *sconnp = (struct sockaddr_conn *)dst;
memcpy(cookie->laddress, &sconnp->sconn_addr , sizeof(void *));
m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, laddress),
(int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
}
#endif
/*
* split off the signature into its own mbuf (since it should not be
* calculated in the sctp_hmac_m() call).
*/
sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
m_sig = m_split(m, sig_offset, M_NOWAIT);
if (m_sig == NULL) {
/* out of memory or ?? */
return (NULL);
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
}
#endif
/*
* compute the signature/digest for the cookie
*/
ep = &(*inp_p)->sctp_ep;
l_inp = *inp_p;
if (l_stcb) {
SCTP_TCB_UNLOCK(l_stcb);
}
SCTP_INP_RLOCK(l_inp);
if (l_stcb) {
SCTP_TCB_LOCK(l_stcb);
}
/* which cookie is it? */
if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
(ep->current_secret_number != ep->last_secret_number)) {
/* it's the old cookie */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->last_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
} else {
/* it's the current cookie */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->current_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
}
/* get the signature */
SCTP_INP_RUNLOCK(l_inp);
sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
if (sig == NULL) {
/* couldn't find signature */
sctp_m_freem(m_sig);
return (NULL);
}
/* compare the received digest with the computed digest */
if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
/* try the old cookie? */
if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
(ep->current_secret_number != ep->last_secret_number)) {
/* compute digest with old */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->last_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
/* compare */
if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
cookie_ok = 1;
}
} else {
cookie_ok = 1;
}
/*
* Now before we continue we must reconstruct our mbuf so that
* normal processing of any other chunks will work.
*/
{
struct mbuf *m_at;
m_at = m;
while (SCTP_BUF_NEXT(m_at) != NULL) {
m_at = SCTP_BUF_NEXT(m_at);
}
SCTP_BUF_NEXT(m_at) = m_sig;
}
if (cookie_ok == 0) {
SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
SCTPDBG(SCTP_DEBUG_INPUT2,
"offset = %u, cookie_offset = %u, sig_offset = %u\n",
(uint32_t) offset, cookie_offset, sig_offset);
return (NULL);
}
/*
* check the cookie timestamps to be sure it's not stale
*/
(void)SCTP_GETTIME_TIMEVAL(&now);
/* Expire time is in Ticks, so we convert to seconds */
time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
time_expires.tv_usec = cookie->time_entered.tv_usec;
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
if (timercmp(&now, &time_expires, >))
#else
if (timevalcmp(&now, &time_expires, >))
#endif
{
/* cookie is stale! */
struct mbuf *op_err;
struct sctp_error_stale_cookie *cause;
struct timeval diff;
uint32_t staleness;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
0, M_NOWAIT, 1, MT_DATA);
if (op_err == NULL) {
/* FOOBAR */
return (NULL);
}
/* Set the len */
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
cause = mtod(op_err, struct sctp_error_stale_cookie *);
cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t))));
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
timersub(&now, &time_expires, &diff);
#else
diff = now;
timevalsub(&diff, &time_expires);
#endif
if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
staleness = UINT32_MAX;
} else {
staleness = diff.tv_sec * 1000000;
}
if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
staleness += diff.tv_usec;
} else {
staleness = UINT32_MAX;
}
cause->stale_time = htonl(staleness);
sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, l_inp->fibnum,
#endif
vrf_id, port);
return (NULL);
}
/*
* Now we must see with the lookup address if we have an existing
* asoc. This will only happen if we were in the COOKIE-WAIT state
* and a INIT collided with us and somewhere the peer sent the
* cookie on another address besides the single address our assoc
* had for him. In this case we will have one of the tie-tags set at
* least AND the address field in the cookie can be used to look it
* up.
*/
to = NULL;
switch (cookie->addr_type) {
#ifdef INET6
case SCTP_IPV6_ADDRESS:
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
sin6.sin6_len = sizeof(sin6);
#endif
sin6.sin6_port = sh->src_port;
sin6.sin6_scope_id = cookie->scope_id;
memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
sizeof(sin6.sin6_addr.s6_addr));
to = (struct sockaddr *)&sin6;
break;
#endif
#ifdef INET
case SCTP_IPV4_ADDRESS:
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
sin.sin_len = sizeof(sin);
#endif
sin.sin_port = sh->src_port;
sin.sin_addr.s_addr = cookie->address[0];
to = (struct sockaddr *)&sin;
break;
#endif
#if defined(__Userspace__)
case SCTP_CONN_ADDRESS:
memset(&sconn, 0, sizeof(struct sockaddr_conn));
sconn.sconn_family = AF_CONN;
#ifdef HAVE_SCONN_LEN
sconn.sconn_len = sizeof(struct sockaddr_conn);
#endif
sconn.sconn_port = sh->src_port;
memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
to = (struct sockaddr *)&sconn;
break;
#endif
default:
/* This should not happen */
return (NULL);
}
if (*stcb == NULL) {
/* Yep, lets check */
*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
if (*stcb == NULL) {
/*
* We should have only got back the same inp. If we
* got back a different ep we have a problem. The
* original findep got back l_inp and now
*/
if (l_inp != *inp_p) {
SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
}
} else {
if (*locked_tcb == NULL) {
/* In this case we found the assoc only
* after we locked the create lock. This means
* we are in a colliding case and we must make
* sure that we unlock the tcb if its one of the
* cases where we throw away the incoming packets.
*/
*locked_tcb = *stcb;
/* We must also increment the inp ref count
* since the ref_count flags was set when we
* did not find the TCB, now we found it which
* reduces the refcount.. we must raise it back
* out to balance it all :-)
*/
SCTP_INP_INCR_REF((*stcb)->sctp_ep);
if ((*stcb)->sctp_ep != l_inp) {
SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
(void *)(*stcb)->sctp_ep, (void *)l_inp);
}
}
}
}
cookie_len -= SCTP_SIGNATURE_SIZE;
if (*stcb == NULL) {
/* this is the "normal" case... get a new TCB */
*stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
cookie, cookie_len, *inp_p,
netp, to, &notification,
auth_skipped, auth_offset, auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
} else {
/* this is abnormal... cookie-echo on existing TCB */
had_a_existing_tcb = 1;
*stcb = sctp_process_cookie_existing(m, iphlen, offset,
src, dst, sh,
cookie, cookie_len, *inp_p, *stcb, netp, to,
&notification, auth_skipped, auth_offset, auth_len,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
}
if (*stcb == NULL) {
/* still no TCB... must be bad cookie-echo */
return (NULL);
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (*netp != NULL) {
(*netp)->flowtype = mflowtype;
(*netp)->flowid = mflowid;
}
#endif
/*
* Ok, we built an association so confirm the address we sent the
* INIT-ACK to.
*/
netl = sctp_findnet(*stcb, to);
/*
* This code should in theory NOT run but
*/
if (netl == NULL) {
/* TSNH! Huh, why do I need to add this address here? */
if (sctp_add_remote_addr(*stcb, to, NULL, port,
SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
return (NULL);
}
netl = sctp_findnet(*stcb, to);
}
if (netl) {
if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
netl);
send_int_conf = 1;
}
}
sctp_start_net_timers(*stcb);
if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
if (!had_a_existing_tcb ||
(((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
/*
* If we have a NEW cookie or the connect never
* reached the connected state during collision we
* must do the TCP accept thing.
*/
struct socket *so, *oso;
struct sctp_inpcb *inp;
if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
/*
* For a restart we will keep the same
* socket, no need to do anything. I THINK!!
*/
sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
return (m);
}
oso = (*inp_p)->sctp_socket;
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
#if defined(__FreeBSD__) && !defined(__Userspace__)
CURVNET_SET(oso->so_vnet);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_LOCK(oso, 1);
#endif
so = sonewconn(oso, 0
#if defined(__APPLE__) && !defined(__Userspace__)
,NULL
#endif
);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(oso, 1);
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
CURVNET_RESTORE();
#endif
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
if (so == NULL) {
struct mbuf *op_err;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *pcb_so;
#endif
/* Too many sockets */
SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(*inp_p, NULL, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
#if defined(__APPLE__) && !defined(__Userspace__)
pcb_so = SCTP_INP_SO(*inp_p);
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
SCTP_SOCKET_LOCK(pcb_so, 1);
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(pcb_so, 1);
#endif
return (NULL);
}
inp = (struct sctp_inpcb *)so->so_pcb;
SCTP_INP_INCR_REF(inp);
/*
* We add the unbound flag here so that
* if we get an soabort() before we get the
* move_pcb done, we will properly cleanup.
*/
inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
SCTP_PCB_FLAGS_CONNECTED |
SCTP_PCB_FLAGS_IN_TCPPOOL |
SCTP_PCB_FLAGS_UNBOUND |
(SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
SCTP_PCB_FLAGS_DONT_WAKE);
inp->sctp_features = (*inp_p)->sctp_features;
inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
inp->sctp_socket = so;
inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
inp->max_cwnd = (*inp_p)->max_cwnd;
inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
inp->ecn_supported = (*inp_p)->ecn_supported;
inp->prsctp_supported = (*inp_p)->prsctp_supported;
inp->auth_supported = (*inp_p)->auth_supported;
inp->asconf_supported = (*inp_p)->asconf_supported;
inp->reconfig_supported = (*inp_p)->reconfig_supported;
inp->nrsack_supported = (*inp_p)->nrsack_supported;
inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
inp->sctp_context = (*inp_p)->sctp_context;
inp->local_strreset_support = (*inp_p)->local_strreset_support;
inp->fibnum = (*inp_p)->fibnum;
inp->inp_starting_point_for_iterator = NULL;
#if defined(__Userspace__)
inp->ulp_info = (*inp_p)->ulp_info;
inp->recv_callback = (*inp_p)->recv_callback;
inp->send_callback = (*inp_p)->send_callback;
inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
#endif
/*
* copy in the authentication parameters from the
* original endpoint
*/
if (inp->sctp_ep.local_hmacs)
sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
inp->sctp_ep.local_hmacs =
sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
if (inp->sctp_ep.local_auth_chunks)
sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
inp->sctp_ep.local_auth_chunks =
sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
/*
* Now we must move it from one hash table to
* another and get the tcb in the right place.
*/
/* This is where the one-2-one socket is put into
* the accept state waiting for the accept!
*/
if (*stcb) {
SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
}
sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
#if defined(__FreeBSD__) && !defined(__Userspace__)
sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
0);
#else
sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
#endif
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
/* now we must check to see if we were aborted while
* the move was going on and the lock/unlock happened.
*/
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* yep it was, we leave the
* assoc attached to the socket since
* the sctp_inpcb_free() call will send
* an abort for us.
*/
SCTP_INP_DECR_REF(inp);
return (NULL);
}
SCTP_INP_DECR_REF(inp);
/* Switch over to the new guy */
*inp_p = inp;
sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
/* Pull it from the incomplete queue and wake the guy */
#if defined(__APPLE__) && !defined(__Userspace__)
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
SCTP_SOCKET_LOCK(so, 1);
#endif
soisconnected(so);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (m);
}
}
if (notification) {
sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
return (m);
}
static void
sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* cp must not be used, others call this without a c-ack :-) */
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_cookie_ack: handling COOKIE-ACK\n");
if ((stcb == NULL) || (net == NULL)) {
return;
}
asoc = &stcb->asoc;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
asoc->overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
asoc->overall_error_count = 0;
sctp_stop_all_cookie_timers(stcb);
/* process according to association state */
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
/* state change only needed when I am in right state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
sctp_start_net_timers(stcb);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
/* update RTO */
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
if (asoc->overall_error_count == 0) {
sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
SCTP_RTT_FROM_NON_DATA);
}
(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
soisconnected(stcb->sctp_socket);
}
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
/*
* since we did not send a HB make sure we don't double
* things
*/
net->hb_responded = 1;
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* We don't need to do the asconf thing,
* nor hb or autoclose if the socket is closed.
*/
goto closed_socket;
}
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, net);
if (stcb->asoc.sctp_autoclose_ticks &&
sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
stcb->sctp_ep, stcb, NULL);
}
/*
* send ASCONF if parameters are pending and ASCONFs are
* allowed (eg. addresses changed when init/cookie echo were
* in flight)
*/
if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
(stcb->asoc.asconf_supported == 1) &&
(!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
#ifdef SCTP_TIMER_BASED_ASCONF
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
stcb->sctp_ep, stcb,
stcb->asoc.primary_destination);
#else
sctp_send_asconf(stcb, stcb->asoc.primary_destination,
SCTP_ADDR_NOT_LOCKED);
#endif
}
}
closed_socket:
/* Toss the cookie if I can */
sctp_toss_old_cookies(stcb, asoc);
/* Restart the timer if we have pending data */
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->whoTo != NULL) {
break;
}
}
if (chk != NULL) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
}
}
static void
sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
struct sctp_tcb *stcb)
{
struct sctp_nets *net;
struct sctp_tmit_chunk *lchk;
struct sctp_ecne_chunk bkup;
uint8_t override_bit;
uint32_t tsn, window_data_tsn;
int len;
unsigned int pkt_cnt;
len = ntohs(cp->ch.chunk_length);
if ((len != sizeof(struct sctp_ecne_chunk)) &&
(len != sizeof(struct old_sctp_ecne_chunk))) {
return;
}
if (len == sizeof(struct old_sctp_ecne_chunk)) {
/* Its the old format */
memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
bkup.num_pkts_since_cwr = htonl(1);
cp = &bkup;
}
SCTP_STAT_INCR(sctps_recvecne);
tsn = ntohl(cp->tsn);
pkt_cnt = ntohl(cp->num_pkts_since_cwr);
lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
if (lchk == NULL) {
window_data_tsn = stcb->asoc.sending_seq - 1;
} else {
window_data_tsn = lchk->rec.data.tsn;
}
/* Find where it was sent to if possible. */
net = NULL;
TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
if (lchk->rec.data.tsn == tsn) {
net = lchk->whoTo;
net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
break;
}
if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
break;
}
}
if (net == NULL) {
/*
* What to do. A previous send of a
* CWR was possibly lost. See how old it is, we
* may have it marked on the actual net.
*/
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if (tsn == net->last_cwr_tsn) {
/* Found him, send it off */
break;
}
}
if (net == NULL) {
/*
* If we reach here, we need to send a special
* CWR that says hey, we did this a long time
* ago and you lost the response.
*/
net = TAILQ_FIRST(&stcb->asoc.nets);
if (net == NULL) {
/* TSNH */
return;
}
override_bit = SCTP_CWR_REDUCE_OVERRIDE;
} else {
override_bit = 0;
}
} else {
override_bit = 0;
}
if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
/* JRS - Use the congestion control given in the pluggable CC module */
stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
/*
* We reduce once every RTT. So we will only lower cwnd at
* the next sending seq i.e. the window_data_tsn
*/
net->cwr_window_tsn = window_data_tsn;
net->ecn_ce_pkt_cnt += pkt_cnt;
net->lost_cnt = pkt_cnt;
net->last_cwr_tsn = tsn;
} else {
override_bit |= SCTP_CWR_IN_SAME_WINDOW;
if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
/*
* Another loss in the same window update how
* many marks/packets lost we have had.
*/
int cnt = 1;
if (pkt_cnt > net->lost_cnt) {
/* Should be the case */
cnt = (pkt_cnt - net->lost_cnt);
net->ecn_ce_pkt_cnt += cnt;
}
net->lost_cnt = pkt_cnt;
net->last_cwr_tsn = tsn;
/*
* Most CC functions will ignore this call, since we are in-window
* yet of the initial CE the peer saw.
*/
stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
}
}
/*
* We always send a CWR this way if our previous one was lost our
* peer will get an update, or if it is not time again to reduce we
* still get the cwr to the peer. Note we set the override when we
* could not find the TSN on the chunk or the destination network.
*/
sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
}
static void
sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
{
/*
* Here we get a CWR from the peer. We must look in the outqueue and
* make sure that we have a covered ECNE in the control chunk part.
* If so remove it.
*/
struct sctp_tmit_chunk *chk, *nchk;
struct sctp_ecne_chunk *ecne;
int override;
uint32_t cwr_tsn;
cwr_tsn = ntohl(cp->tsn);
override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
continue;
}
if ((override == 0) && (chk->whoTo != net)) {
/* Must be from the right src unless override is set */
continue;
}
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
/* this covers this ECNE, we can remove it */
stcb->asoc.ecn_echo_cnt_onq--;
TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
sctp_next);
stcb->asoc.ctrl_queue_cnt--;
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
if (override == 0) {
break;
}
}
}
}
static void
sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
if (stcb == NULL)
return;
/* process according to association state */
if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
/* unexpected SHUTDOWN-COMPLETE... so ignore... */
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
SCTP_TCB_UNLOCK(stcb);
return;
}
/* notify upper layer protocol */
if (stcb->sctp_socket) {
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
#ifdef INVARIANTS
if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
!TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
}
#endif
/* stop the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
/* free the TCB */
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: calls free-asoc\n");
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return;
}
static int
process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
struct sctp_nets *net, uint8_t flg)
{
switch (desc->chunk_type) {
case SCTP_DATA:
case SCTP_IDATA:
/* find the tsn to resend (possibly) */
{
uint32_t tsn;
struct sctp_tmit_chunk *tp1;
tsn = ntohl(desc->tsn_ifany);
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
if (tp1->rec.data.tsn == tsn) {
/* found it */
break;
}
if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
/* not found */
tp1 = NULL;
break;
}
}
if (tp1 == NULL) {
/*
* Do it the other way , aka without paying
* attention to queue seq order.
*/
SCTP_STAT_INCR(sctps_pdrpdnfnd);
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
if (tp1->rec.data.tsn == tsn) {
/* found it */
break;
}
}
}
if (tp1 == NULL) {
SCTP_STAT_INCR(sctps_pdrptsnnf);
}
if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
if (((flg & SCTP_BADCRC) == 0) &&
((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
return (0);
}
if ((stcb->asoc.peers_rwnd == 0) &&
((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
SCTP_STAT_INCR(sctps_pdrpdiwnp);
return (0);
}
if (stcb->asoc.peers_rwnd == 0 &&
(flg & SCTP_FROM_MIDDLE_BOX)) {
SCTP_STAT_INCR(sctps_pdrpdizrw);
return (0);
}
if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
/* Payload not matching. */
SCTP_STAT_INCR(sctps_pdrpbadd);
return (-1);
}
if (memcmp(mtod(tp1->data, caddr_t) + SCTP_DATA_CHUNK_OVERHEAD(stcb),
desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
/* Payload not matching. */
SCTP_STAT_INCR(sctps_pdrpbadd);
return (-1);
}
if (tp1->do_rtt) {
/*
* this guy had a RTO calculation
* pending on it, cancel it
*/
if (tp1->whoTo->rto_needed == 0) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
SCTP_STAT_INCR(sctps_pdrpmark);
if (tp1->sent != SCTP_DATAGRAM_RESEND)
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
/*
* mark it as if we were doing a FR, since
* we will be getting gap ack reports behind
* the info from the router.
*/
tp1->rec.data.doing_fast_retransmit = 1;
/*
* mark the tsn with what sequences can
* cause a new FR.
*/
if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
} else {
tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
}
/* restart the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, tp1->whoTo,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, tp1->whoTo);
/* fix counts and things */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t)(uintptr_t)stcb,
tp1->rec.data.tsn);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
}
tp1->sent = SCTP_DATAGRAM_RESEND;
} {
/* audit code */
unsigned int audit;
audit = 0;
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
if (tp1->sent == SCTP_DATAGRAM_RESEND)
audit++;
}
TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
sctp_next) {
if (tp1->sent == SCTP_DATAGRAM_RESEND)
audit++;
}
if (audit != stcb->asoc.sent_queue_retran_cnt) {
SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
audit, stcb->asoc.sent_queue_retran_cnt);
#ifndef SCTP_AUDITING_ENABLED
stcb->asoc.sent_queue_retran_cnt = audit;
#endif
}
}
}
break;
case SCTP_ASCONF:
{
struct sctp_tmit_chunk *asconf;
TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
sctp_next) {
if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
break;
}
}
if (asconf) {
if (asconf->sent != SCTP_DATAGRAM_RESEND)
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
asconf->sent = SCTP_DATAGRAM_RESEND;
asconf->snd_count--;
}
}
break;
case SCTP_INITIATION:
/* resend the INIT */
stcb->asoc.dropped_special_cnt++;
if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
/*
* If we can get it in, in a few attempts we do
* this, otherwise we let the timer fire.
*/
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
}
break;
case SCTP_SELECTIVE_ACK:
case SCTP_NR_SELECTIVE_ACK:
/* resend the sack */
sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
break;
case SCTP_HEARTBEAT_REQUEST:
/* resend a demand HB */
if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
/* Only retransmit if we KNOW we wont destroy the tcb */
sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
}
break;
case SCTP_SHUTDOWN:
sctp_send_shutdown(stcb, net);
break;
case SCTP_SHUTDOWN_ACK:
sctp_send_shutdown_ack(stcb, net);
break;
case SCTP_COOKIE_ECHO:
{
struct sctp_tmit_chunk *cookie;
cookie = NULL;
TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
sctp_next) {
if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
break;
}
}
if (cookie) {
if (cookie->sent != SCTP_DATAGRAM_RESEND)
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
cookie->sent = SCTP_DATAGRAM_RESEND;
sctp_stop_all_cookie_timers(stcb);
}
}
break;
case SCTP_COOKIE_ACK:
sctp_send_cookie_ack(stcb);
break;
case SCTP_ASCONF_ACK:
/* resend last asconf ack */
sctp_send_asconf_ack(stcb);
break;
case SCTP_IFORWARD_CUM_TSN:
case SCTP_FORWARD_CUM_TSN:
send_forward_tsn(stcb, &stcb->asoc);
break;
/* can't do anything with these */
case SCTP_PACKET_DROPPED:
case SCTP_INITIATION_ACK: /* this should not happen */
case SCTP_HEARTBEAT_ACK:
case SCTP_ABORT_ASSOCIATION:
case SCTP_OPERATION_ERROR:
case SCTP_SHUTDOWN_COMPLETE:
case SCTP_ECN_ECHO:
case SCTP_ECN_CWR:
default:
break;
}
return (0);
}
void
sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
/*
* We set things to 0xffffffff since this is the last delivered sequence
* and we will be sending in 0 after the reset.
*/
if (number_entries) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(list[i]);
if (temp >= stcb->asoc.streamincnt) {
continue;
}
stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
}
} else {
list = NULL;
for (i = 0; i < stcb->asoc.streamincnt; i++) {
stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
}
}
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
}
static void
sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
if (number_entries > 0) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(list[i]);
if (temp >= stcb->asoc.streamoutcnt) {
/* no such stream */
continue;
}
stcb->asoc.strmout[temp].next_mid_ordered = 0;
stcb->asoc.strmout[temp].next_mid_unordered = 0;
}
} else {
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].next_mid_ordered = 0;
stcb->asoc.strmout[i].next_mid_unordered = 0;
}
}
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
}
static void
sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
if (number_entries > 0) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(list[i]);
if (temp >= stcb->asoc.streamoutcnt) {
/* no such stream */
continue;
}
stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
}
} else {
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
}
}
}
struct sctp_stream_reset_request *
sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
{
struct sctp_association *asoc;
struct sctp_chunkhdr *ch;
struct sctp_stream_reset_request *r;
struct sctp_tmit_chunk *chk;
int len, clen;
asoc = &stcb->asoc;
if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
asoc->stream_reset_outstanding = 0;
return (NULL);
}
if (stcb->asoc.str_reset == NULL) {
asoc->stream_reset_outstanding = 0;
return (NULL);
}
chk = stcb->asoc.str_reset;
if (chk->data == NULL) {
return (NULL);
}
if (bchk) {
/* he wants a copy of the chk pointer */
*bchk = chk;
}
clen = chk->send_size;
ch = mtod(chk->data, struct sctp_chunkhdr *);
r = (struct sctp_stream_reset_request *)(ch + 1);
if (ntohl(r->request_seq) == seq) {
/* found it */
return (r);
}
len = SCTP_SIZE32(ntohs(r->ph.param_length));
if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
/* move to the next one, there can only be a max of two */
r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
if (ntohl(r->request_seq) == seq) {
return (r);
}
}
/* that seq is not here */
return (NULL);
}
static void
sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
asoc = &stcb->asoc;
chk = asoc->str_reset;
if (chk == NULL) {
return;
}
asoc->str_reset = NULL;
sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt--;
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
static int
sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
uint32_t seq, uint32_t action,
struct sctp_stream_reset_response *respin)
{
uint16_t type;
int lparam_len;
struct sctp_association *asoc = &stcb->asoc;
struct sctp_tmit_chunk *chk;
struct sctp_stream_reset_request *req_param;
struct sctp_stream_reset_out_request *req_out_param;
struct sctp_stream_reset_in_request *req_in_param;
uint32_t number_entries;
if (asoc->stream_reset_outstanding == 0) {
/* duplicate */
return (0);
}
if (seq == stcb->asoc.str_reset_seq_out) {
req_param = sctp_find_stream_reset(stcb, seq, &chk);
if (req_param != NULL) {
stcb->asoc.str_reset_seq_out++;
type = ntohs(req_param->ph.param_type);
lparam_len = ntohs(req_param->ph.param_length);
if (type == SCTP_STR_RESET_OUT_REQUEST) {
int no_clear = 0;
req_out_param = (struct sctp_stream_reset_out_request *)req_param;
number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
asoc->stream_reset_out_is_outstanding = 0;
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
/* do it */
sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
/* Set it up so we don't stop retransmitting */
asoc->stream_reset_outstanding++;
stcb->asoc.str_reset_seq_out--;
asoc->stream_reset_out_is_outstanding = 1;
no_clear = 1;
} else {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
}
if (no_clear == 0) {
sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
}
} else if (type == SCTP_STR_RESET_IN_REQUEST) {
req_in_param = (struct sctp_stream_reset_in_request *)req_param;
number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
}
} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
/* Ok we now may have more streams */
int num_stream;
num_stream = stcb->asoc.strm_pending_add_size;
if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
/* TSNH */
num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
}
stcb->asoc.strm_pending_add_size = 0;
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
/* Put the new streams into effect */
int i;
for ( i = asoc->streamoutcnt; i< (asoc->streamoutcnt + num_stream); i++) {
asoc->strmout[i].state = SCTP_STREAM_OPEN;
}
asoc->streamoutcnt += num_stream;
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_DENIED);
} else {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_FAILED);
}
} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_DENIED);
} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_FAILED);
}
} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
/**
* a) Adopt the new in tsn.
* b) reset the map
* c) Adopt the new out-tsn
*/
struct sctp_stream_reset_response_tsn *resp;
struct sctp_forward_tsn_chunk fwdtsn;
int abort_flag = 0;
if (respin == NULL) {
/* huh ? */
return (0);
}
if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
return (0);
}
if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
resp = (struct sctp_stream_reset_response_tsn *)respin;
asoc->stream_reset_outstanding--;
fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
if (abort_flag) {
return (1);
}
stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
SCTP_ASSOC_RESET_DENIED);
} else {
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
SCTP_ASSOC_RESET_FAILED);
}
}
/* get rid of the request and get the request flags */
if (asoc->stream_reset_outstanding == 0) {
sctp_clean_up_stream_reset(stcb);
}
}
}
if (asoc->stream_reset_outstanding == 0) {
sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
}
return (0);
}
static void
sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_in_request *req, int trunc)
{
uint32_t seq;
int len, i;
int number_entries;
uint16_t temp;
/*
* peer wants me to send a str-reset to him for my outgoing seq's if
* seq_in is right.
*/
struct sctp_association *asoc = &stcb->asoc;
seq = ntohl(req->request_seq);
if (asoc->str_reset_seq_in == seq) {
asoc->last_reset_action[1] = asoc->last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (trunc) {
/* Can't do it, since they exceeded our buffer size */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
len = ntohs(req->ph.param_length);
number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
if (number_entries) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(req->list_of_streams[i]);
if (temp >= stcb->asoc.streamoutcnt) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
goto bad_boy;
}
req->list_of_streams[i] = temp;
}
for (i = 0; i < number_entries; i++) {
if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
}
}
} else {
/* Its all */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
}
}
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
} else {
/* Can't do it, since we have sent one out */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
}
bad_boy:
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
asoc->str_reset_seq_in++;
} else if (asoc->str_reset_seq_in - 1 == seq) {
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
} else if (asoc->str_reset_seq_in - 2 == seq) {
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
}
sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
}
static int
sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_tsn_request *req)
{
/* reset all in and out and update the tsn */
/*
* A) reset my str-seq's on in and out. B) Select a receive next,
* and set cum-ack to it. Also process this selected number as a
* fwd-tsn as well. C) set in the response my next sending seq.
*/
struct sctp_forward_tsn_chunk fwdtsn;
struct sctp_association *asoc = &stcb->asoc;
int abort_flag = 0;
uint32_t seq;
seq = ntohl(req->request_seq);
if (asoc->str_reset_seq_in == seq) {
asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else {
fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
fwdtsn.ch.chunk_flags = 0;
fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
if (abort_flag) {
return (1);
}
asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
memset(asoc->mapping_array, 0, asoc->mapping_array_size);
asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
atomic_add_int(&asoc->sending_seq, 1);
/* save off historical data for retrans */
asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
asoc->last_sending_seq[0] = asoc->sending_seq;
asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
}
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
asoc->str_reset_seq_in++;
} else if (asoc->str_reset_seq_in - 1 == seq) {
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
} else if (asoc->str_reset_seq_in - 2 == seq) {
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
}
return (0);
}
static void
sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_out_request *req, int trunc)
{
uint32_t seq, tsn;
int number_entries, len;
struct sctp_association *asoc = &stcb->asoc;
seq = ntohl(req->request_seq);
/* now if its not a duplicate we process it */
if (asoc->str_reset_seq_in == seq) {
len = ntohs(req->ph.param_length);
number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
/*
* the sender is resetting, handle the list issue.. we must
* a) verify if we can do the reset, if so no problem b) If
* we can't do the reset we must copy the request. c) queue
* it, and setup the data in processor to trigger it off
* when needed and dequeue all the queued data.
*/
tsn = ntohl(req->send_reset_at_tsn);
/* move the reset action back one */
asoc->last_reset_action[1] = asoc->last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (trunc) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
/* we can do it now */
sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
} else {
/*
* we must queue it up and thus wait for the TSN's
* to arrive that are at or before tsn
*/
struct sctp_stream_reset_list *liste;
int siz;
siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
siz, SCTP_M_STRESET);
if (liste == NULL) {
/* gak out of memory */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
return;
}
liste->seq = seq;
liste->tsn = tsn;
liste->number_entries = number_entries;
memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
}
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
asoc->str_reset_seq_in++;
} else if ((asoc->str_reset_seq_in - 1) == seq) {
/*
* one seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
} else if ((asoc->str_reset_seq_in - 2) == seq) {
/*
* two seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
}
}
static void
sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_add_strm *str_add)
{
/*
* Peer is requesting to add more streams.
* If its within our max-streams we will
* allow it.
*/
uint32_t num_stream, i;
uint32_t seq;
struct sctp_association *asoc = &stcb->asoc;
struct sctp_queued_to_read *ctl, *nctl;
/* Get the number. */
seq = ntohl(str_add->request_seq);
num_stream = ntohs(str_add->number_of_streams);
/* Now what would be the new total? */
if (asoc->str_reset_seq_in == seq) {
num_stream += stcb->asoc.streamincnt;
stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
(num_stream > 0xffff)) {
/* We must reject it they ask for to many */
denied:
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else {
/* Ok, we can do that :-) */
struct sctp_stream_in *oldstrm;
/* save off the old */
oldstrm = stcb->asoc.strmin;
SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
(num_stream * sizeof(struct sctp_stream_in)),
SCTP_M_STRMI);
if (stcb->asoc.strmin == NULL) {
stcb->asoc.strmin = oldstrm;
goto denied;
}
/* copy off the old data */
for (i = 0; i < stcb->asoc.streamincnt; i++) {
TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
stcb->asoc.strmin[i].sid = i;
stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
/* now anything on those queues? */
TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
}
TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
}
}
/* Init the new streams */
for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
stcb->asoc.strmin[i].sid = i;
stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
stcb->asoc.strmin[i].pd_api_started = 0;
stcb->asoc.strmin[i].delivery_started = 0;
}
SCTP_FREE(oldstrm, SCTP_M_STRMI);
/* update the size */
stcb->asoc.streamincnt = num_stream;
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
}
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
asoc->str_reset_seq_in++;
} else if ((asoc->str_reset_seq_in - 1) == seq) {
/*
* one seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
} else if ((asoc->str_reset_seq_in - 2) == seq) {
/*
* two seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
}
}
static void
sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_add_strm *str_add)
{
/*
* Peer is requesting to add more streams.
* If its within our max-streams we will
* allow it.
*/
uint16_t num_stream;
uint32_t seq;
struct sctp_association *asoc = &stcb->asoc;
/* Get the number. */
seq = ntohl(str_add->request_seq);
num_stream = ntohs(str_add->number_of_streams);
/* Now what would be the new total? */
if (asoc->str_reset_seq_in == seq) {
stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (stcb->asoc.stream_reset_outstanding) {
/* We must reject it we have something pending */
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
} else {
/* Ok, we can do that :-) */
int mychk;
mychk = stcb->asoc.streamoutcnt;
mychk += num_stream;
if (mychk < 0x10000) {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
}
} else {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
}
}
sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
asoc->str_reset_seq_in++;
} else if ((asoc->str_reset_seq_in - 1) == seq) {
/*
* one seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
} else if ((asoc->str_reset_seq_in - 2) == seq) {
/*
* two seq back, just echo back last action since my
* response was lost.
*/
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
}
}
#ifdef __GNUC__
__attribute__ ((noinline))
#endif
static int
sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
struct sctp_chunkhdr *ch_req)
{
uint16_t remaining_length, param_len, ptype;
struct sctp_paramhdr pstore;
uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
uint32_t seq = 0;
int num_req = 0;
int trunc = 0;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;
struct sctp_paramhdr *ph;
int ret_code = 0;
int num_param = 0;
/* now it may be a reset or a reset-response */
remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
/* setup for adding the response */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return (ret_code);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->no_fr_allowed = 0;
chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
chk->book_size_scale = 0;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
strres_nochunk:
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
return (ret_code);
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = NULL;
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->send_size);
SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
offset += sizeof(struct sctp_chunkhdr);
while (remaining_length >= sizeof(struct sctp_paramhdr)) {
ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
if (ph == NULL) {
/* TSNH */
break;
}
param_len = ntohs(ph->param_length);
if ((param_len > remaining_length) ||
(param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
/* bad parameter length */
break;
}
ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
(uint8_t *)&cstore);
if (ph == NULL) {
/* TSNH */
break;
}
ptype = ntohs(ph->param_type);
num_param++;
if (param_len > sizeof(cstore)) {
trunc = 1;
} else {
trunc = 0;
}
if (num_param > SCTP_MAX_RESET_PARAMS) {
/* hit the max of parameters already sorry.. */
break;
}
if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
struct sctp_stream_reset_out_request *req_out;
if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
break;
}
req_out = (struct sctp_stream_reset_out_request *)ph;
num_req++;
if (stcb->asoc.stream_reset_outstanding) {
seq = ntohl(req_out->response_seq);
if (seq == stcb->asoc.str_reset_seq_out) {
/* implicit ack */
(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
}
}
sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
struct sctp_stream_reset_add_strm *str_add;
if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
break;
}
str_add = (struct sctp_stream_reset_add_strm *)ph;
num_req++;
sctp_handle_str_reset_add_strm(stcb, chk, str_add);
} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
struct sctp_stream_reset_add_strm *str_add;
if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
break;
}
str_add = (struct sctp_stream_reset_add_strm *)ph;
num_req++;
sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
struct sctp_stream_reset_in_request *req_in;
num_req++;
req_in = (struct sctp_stream_reset_in_request *)ph;
sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
struct sctp_stream_reset_tsn_request *req_tsn;
num_req++;
req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
ret_code = 1;
goto strres_nochunk;
}
/* no more */
break;
} else if (ptype == SCTP_STR_RESET_RESPONSE) {
struct sctp_stream_reset_response *resp;
uint32_t result;
if (param_len < sizeof(struct sctp_stream_reset_response)) {
break;
}
resp = (struct sctp_stream_reset_response *)ph;
seq = ntohl(resp->response_seq);
result = ntohl(resp->result);
if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
ret_code = 1;
goto strres_nochunk;
}
} else {
break;
}
offset += SCTP_SIZE32(param_len);
if (remaining_length >= SCTP_SIZE32(param_len)) {
remaining_length -= SCTP_SIZE32(param_len);
} else {
remaining_length = 0;
}
}
if (num_req == 0) {
/* we have no response free the stuff */
goto strres_nochunk;
}
/* ok we have a chunk to link in */
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
chk,
sctp_next);
stcb->asoc.ctrl_queue_cnt++;
return (ret_code);
}
/*
* Handle a router or endpoints report of a packet loss, there are two ways
* to handle this, either we get the whole packet and must disect it
* ourselves (possibly with truncation and or corruption) or it is a summary
* from a middle box that did the disectting for us.
*/
static void
sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
{
struct sctp_chunk_desc desc;
struct sctp_chunkhdr *chk_hdr;
struct sctp_data_chunk *data_chunk;
struct sctp_idata_chunk *idata_chunk;
uint32_t bottle_bw, on_queue;
uint32_t offset, chk_len;
uint16_t trunc_len;
uint16_t pktdrp_len;
uint8_t pktdrp_flags;
KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
("PKTDROP chunk too small"));
pktdrp_flags = cp->ch.chunk_flags;
pktdrp_len = ntohs(cp->ch.chunk_length);
KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
trunc_len = ntohs(cp->trunc_len);
if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
/* The peer plays games with us. */
return;
}
} else {
trunc_len = 0;
}
limit -= sizeof(struct sctp_pktdrop_chunk);
offset = 0;
if (offset == limit) {
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpbwrpt);
}
} else if (offset + sizeof(struct sctphdr) > limit) {
/* Only a partial SCTP common header. */
SCTP_STAT_INCR(sctps_pdrpcrupt);
offset = limit;
} else {
/* XXX: Check embedded SCTP common header. */
offset += sizeof(struct sctphdr);
}
/* Now parse through the chunks themselves. */
while (offset < limit) {
if (offset + sizeof(struct sctp_chunkhdr) > limit) {
SCTP_STAT_INCR(sctps_pdrpcrupt);
break;
}
chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
desc.chunk_type = chk_hdr->chunk_type;
/* get amount we need to move */
chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
if (chk_len < sizeof(struct sctp_chunkhdr)) {
/* Someone is lying... */
break;
}
if (desc.chunk_type == SCTP_DATA) {
if (stcb->asoc.idata_supported) {
/* Some is playing games with us. */
break;
}
if (chk_len <= sizeof(struct sctp_data_chunk)) {
/* Some is playing games with us. */
break;
}
if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
/* Not enough data bytes available in the chunk. */
SCTP_STAT_INCR(sctps_pdrpnedat);
goto next_chunk;
}
if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
/* Not enough data in buffer. */
break;
}
data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
desc.tsn_ifany = data_chunk->dp.tsn;
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbda);
}
} else if (desc.chunk_type == SCTP_IDATA) {
if (!stcb->asoc.idata_supported) {
/* Some is playing games with us. */
break;
}
if (chk_len <= sizeof(struct sctp_idata_chunk)) {
/* Some is playing games with us. */
break;
}
if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
/* Not enough data bytes available in the chunk. */
SCTP_STAT_INCR(sctps_pdrpnedat);
goto next_chunk;
}
if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
/* Not enough data in buffer. */
break;
}
idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
desc.tsn_ifany = idata_chunk->dp.tsn;
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbda);
}
} else {
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbct);
}
}
if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
SCTP_STAT_INCR(sctps_pdrppdbrk);
break;
}
next_chunk:
offset += SCTP_SIZE32(chk_len);
}
/* Now update any rwnd --- possibly */
if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
/* From a peer, we get a rwnd report */
uint32_t a_rwnd;
SCTP_STAT_INCR(sctps_pdrpfehos);
bottle_bw = ntohl(cp->bottle_bw);
on_queue = ntohl(cp->current_onq);
if (bottle_bw && on_queue) {
/* a rwnd report is in here */
if (bottle_bw > on_queue)
a_rwnd = bottle_bw - on_queue;
else
a_rwnd = 0;
if (a_rwnd == 0)
stcb->asoc.peers_rwnd = 0;
else {
if (a_rwnd > stcb->asoc.total_flight) {
stcb->asoc.peers_rwnd =
a_rwnd - stcb->asoc.total_flight;
} else {
stcb->asoc.peers_rwnd = 0;
}
if (stcb->asoc.peers_rwnd <
stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
stcb->asoc.peers_rwnd = 0;
}
}
}
} else {
SCTP_STAT_INCR(sctps_pdrpfmbox);
}
/* now middle boxes in sat networks get a cwnd bump */
if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
(stcb->asoc.sat_t3_loss_recovery == 0) &&
(stcb->asoc.sat_network)) {
/*
* This is debatable but for sat networks it makes sense
* Note if a T3 timer has went off, we will prohibit any
* changes to cwnd until we exit the t3 loss recovery.
*/
stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
net, cp, &bottle_bw, &on_queue);
}
}
/*
* handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
* still contain IP/SCTP header - stcb: is the tcb found for this packet -
* offset: offset into the mbuf chain to first chunkhdr - length: is the
* length of the complete packet outputs: - length: modified to remaining
* length after control processing - netp: modified to new sctp_nets after
* cookie-echo processing - return NULL to discard the packet (ie. no asoc,
* bad packet,...) otherwise return the tcb for this packet
*/
#ifdef __GNUC__
__attribute__ ((noinline))
#endif
static struct sctp_tcb *
sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
#endif
uint32_t vrf_id, uint16_t port)
{
struct sctp_association *asoc;
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
uint32_t vtag_in;
int num_chunks = 0; /* number of control chunks processed */
uint32_t chk_length, contiguous;
int ret;
int abort_no_unlock = 0;
int ecne_seen = 0;
/*
* How big should this be, and should it be alloc'd? Lets try the
* d-mtu-ceiling for now (2k) and that should hopefully work ...
* until we get into jumbo grams and such..
*/
uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
int got_auth = 0;
uint32_t auth_offset = 0, auth_len = 0;
int auth_skipped = 0;
int asconf_cnt = 0;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so;
#endif
SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
iphlen, *offset, length, (void *)stcb);
if (stcb) {
SCTP_TCB_LOCK_ASSERT(stcb);
}
/* validate chunk header length... */
if (ntohs(ch->chunk_length) < sizeof(*ch)) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
ntohs(ch->chunk_length));
*offset = length;
return (stcb);
}
/*
* validate the verification tag
*/
vtag_in = ntohl(sh->v_tag);
if (ch->chunk_type == SCTP_INITIATION) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
ntohs(ch->chunk_length), vtag_in);
if (vtag_in != 0) {
/* protocol error- silently discard... */
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
/*
* If there is no stcb, skip the AUTH chunk and process
* later after a stcb is found (to validate the lookup was
* valid.
*/
if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
(stcb == NULL) &&
(inp->auth_supported == 1)) {
/* save this chunk for later processing */
auth_skipped = 1;
auth_offset = *offset;
auth_len = ntohs(ch->chunk_length);
/* (temporarily) move past this chunk */
*offset += SCTP_SIZE32(auth_len);
if (*offset >= length) {
/* no more data left in the mbuf chain */
*offset = length;
return (NULL);
}
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_chunkhdr), chunk_buf);
}
if (ch == NULL) {
/* Help */
*offset = length;
return (stcb);
}
if (ch->chunk_type == SCTP_COOKIE_ECHO) {
goto process_control_chunks;
}
/*
* first check if it's an ASCONF with an unknown src addr we
* need to look inside to find the association
*/
if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
struct sctp_chunkhdr *asconf_ch = ch;
uint32_t asconf_offset = 0, asconf_len = 0;
/* inp's refcount may be reduced */
SCTP_INP_INCR_REF(inp);
asconf_offset = *offset;
do {
asconf_len = ntohs(asconf_ch->chunk_length);
if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
break;
stcb = sctp_findassociation_ep_asconf(m,
*offset,
dst,
sh, &inp, netp, vrf_id);
if (stcb != NULL)
break;
asconf_offset += SCTP_SIZE32(asconf_len);
asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
sizeof(struct sctp_chunkhdr), chunk_buf);
} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
if (stcb == NULL) {
/*
* reduce inp's refcount if not reduced in
* sctp_findassociation_ep_asconf().
*/
SCTP_INP_DECR_REF(inp);
}
/* now go back and verify any auth chunk to be sure */
if (auth_skipped && (stcb != NULL)) {
struct sctp_auth_chunk *auth;
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
got_auth = 1;
auth_skipped = 0;
} else {
auth = NULL;
}
if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
auth_offset)) {
/* auth HMAC failed so dump it */
*offset = length;
return (stcb);
} else {
/* remaining chunks are HMAC checked */
stcb->asoc.authenticated = 1;
}
}
}
if (stcb == NULL) {
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
/* no association, so it's out of the blue... */
sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, port);
*offset = length;
return (NULL);
}
asoc = &stcb->asoc;
/* ABORT and SHUTDOWN can use either v_tag... */
if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
(ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
(ch->chunk_type == SCTP_PACKET_DROPPED)) {
/* Take the T-bit always into account. */
if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
(vtag_in == asoc->my_vtag)) ||
(((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
(asoc->peer_vtag != htonl(0)) &&
(vtag_in == asoc->peer_vtag))) {
/* this is valid */
} else {
/* drop this packet... */
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
} else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
if (vtag_in != asoc->my_vtag) {
/*
* this could be a stale SHUTDOWN-ACK or the
* peer never got the SHUTDOWN-COMPLETE and
* is still hung; we have started a new asoc
* but it won't complete until the shutdown
* is completed
*/
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, *offset, src, dst,
sh, inp, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
return (NULL);
}
} else {
/* for all other chunks, vtag must match */
if (vtag_in != asoc->my_vtag) {
/* invalid vtag... */
SCTPDBG(SCTP_DEBUG_INPUT3,
"invalid vtag: %xh, expect %xh\n",
vtag_in, asoc->my_vtag);
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
*offset = length;
return (NULL);
}
}
} /* end if !SCTP_COOKIE_ECHO */
/*
* process all control chunks...
*/
if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
(ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
(ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
/* implied cookie-ack.. we must have lost the ack */
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
*netp);
}
process_control_chunks:
while (IS_SCTP_CONTROL(ch)) {
/* validate chunk length */
chk_length = ntohs(ch->chunk_length);
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
ch->chunk_type, chk_length);
SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
if (chk_length < sizeof(*ch) ||
(*offset + (int)chk_length) > length) {
*offset = length;
return (stcb);
}
SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
/*
* INIT and INIT-ACK only gets the init ack "header" portion
* only because we don't have to process the peer's COOKIE.
* All others get a complete chunk.
*/
switch (ch->chunk_type) {
case SCTP_INITIATION:
contiguous = sizeof(struct sctp_init_chunk);
break;
case SCTP_INITIATION_ACK:
contiguous = sizeof(struct sctp_init_ack_chunk);
break;
default:
contiguous = min(chk_length, sizeof(chunk_buf));
break;
}
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
contiguous,
chunk_buf);
if (ch == NULL) {
*offset = length;
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
num_chunks++;
/* Save off the last place we got a control from */
if (stcb != NULL) {
if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
/*
* allow last_control to be NULL if
* ASCONF... ASCONF processing will find the
* right net later
*/
if ((netp != NULL) && (*netp != NULL))
stcb->asoc.last_control_chunk_from = *netp;
}
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xB0, ch->chunk_type);
#endif
/* check to see if this chunk required auth, but isn't */
if ((stcb != NULL) &&
sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
!stcb->asoc.authenticated) {
/* "silently" ignore */
SCTP_STAT_INCR(sctps_recvauthmissing);
goto next_chunk;
}
switch (ch->chunk_type) {
case SCTP_INITIATION:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
/* The INIT chunk must be the only chunk. */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
/* RFC 4960 requires that no ABORT is sent */
*offset = length;
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
/* Honor our resource limit. */
if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
*offset = length;
return (NULL);
}
sctp_handle_init(m, iphlen, *offset, src, dst, sh,
(struct sctp_init_chunk *)ch, inp,
stcb, *netp, &abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
*offset = length;
if ((!abort_no_unlock) && (stcb != NULL)) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
break;
case SCTP_PAD_CHUNK:
break;
case SCTP_INITIATION_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
;
} else {
*offset = length;
if (stcb != NULL) {
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(inp);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
return (NULL);
}
}
/* The INIT-ACK chunk must be the only chunk. */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
*offset = length;
return (stcb);
}
if ((netp != NULL) && (*netp != NULL)) {
ret = sctp_handle_init_ack(m, iphlen, *offset,
src, dst, sh,
(struct sctp_init_ack_chunk *)ch,
stcb, *netp,
&abort_no_unlock,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id);
} else {
ret = -1;
}
*offset = length;
if (abort_no_unlock) {
return (NULL);
}
/*
* Special case, I must call the output routine to
* get the cookie echoed
*/
if ((stcb != NULL) && (ret == 0)) {
sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
}
return (stcb);
break;
case SCTP_SELECTIVE_ACK:
case SCTP_NR_SELECTIVE_ACK:
{
int abort_now = 0;
uint32_t a_rwnd, cum_ack;
uint16_t num_seg, num_nr_seg, num_dup;
uint8_t flags;
int offset_seg, offset_dup;
SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
SCTP_STAT_INCR(sctps_recvsacks);
if (stcb == NULL) {
SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
(ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
break;
}
if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
if (chk_length < sizeof(struct sctp_sack_chunk)) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
break;
}
} else {
if (stcb->asoc.nrsack_supported == 0) {
goto unknown_chunk;
}
if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
break;
}
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
/*-
* If we have sent a shutdown-ack, we will pay no
* attention to a sack sent in to us since
* we don't care anymore.
*/
break;
}
flags = ch->chunk_flags;
if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
struct sctp_sack_chunk *sack;
sack = (struct sctp_sack_chunk *)ch;
cum_ack = ntohl(sack->sack.cum_tsn_ack);
num_seg = ntohs(sack->sack.num_gap_ack_blks);
num_nr_seg = 0;
num_dup = ntohs(sack->sack.num_dup_tsns);
a_rwnd = ntohl(sack->sack.a_rwnd);
if (sizeof(struct sctp_sack_chunk) +
num_seg * sizeof(struct sctp_gap_ack_block) +
num_dup * sizeof(uint32_t) != chk_length) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
break;
}
offset_seg = *offset + sizeof(struct sctp_sack_chunk);
offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
} else {
struct sctp_nr_sack_chunk *nr_sack;
nr_sack = (struct sctp_nr_sack_chunk *)ch;
cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
if (sizeof(struct sctp_nr_sack_chunk) +
(num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
num_dup * sizeof(uint32_t) != chk_length) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
break;
}
offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
}
SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
(ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
cum_ack, num_seg, a_rwnd);
stcb->asoc.seen_a_sack_this_pkt = 1;
if ((stcb->asoc.pr_sctp_cnt == 0) &&
(num_seg == 0) && (num_nr_seg == 0) &&
SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
(stcb->asoc.saw_sack_with_frags == 0) &&
(stcb->asoc.saw_sack_with_nr_frags == 0) &&
(!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
/*
* We have a SIMPLE sack having no
* prior segments and data on sent
* queue to be acked. Use the
* faster path sack processing. We
* also allow window update sacks
* with no missing segments to go
* this way too.
*/
sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
&abort_now, ecne_seen);
} else {
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_sack(m, offset_seg, offset_dup, stcb,
num_seg, num_nr_seg, num_dup, &abort_now, flags,
cum_ack, a_rwnd, ecne_seen);
}
}
if (abort_now) {
/* ABORT signal from sack processing */
*offset = length;
return (NULL);
}
if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
(stcb->asoc.stream_queue_cnt == 0)) {
sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
break;
}
case SCTP_HEARTBEAT_REQUEST:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
SCTP_STAT_INCR(sctps_recvheartbeat);
sctp_send_heartbeat_ack(stcb, m, *offset,
chk_length, *netp);
}
break;
case SCTP_HEARTBEAT_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
/* Its not ours */
*offset = length;
return (stcb);
}
SCTP_STAT_INCR(sctps_recvheartbeatack);
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
stcb, *netp);
}
break;
case SCTP_ABORT_ASSOCIATION:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
(void *)stcb);
*offset = length;
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
return (NULL);
} else {
return (stcb);
}
} else {
return (NULL);
}
break;
case SCTP_SHUTDOWN:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
(void *)stcb);
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
*offset = length;
return (stcb);
}
if ((netp != NULL) && (*netp != NULL)) {
int abort_flag = 0;
sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
stcb, *netp, &abort_flag);
if (abort_flag) {
*offset = length;
return (NULL);
}
}
break;
case SCTP_SHUTDOWN_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
}
*offset = length;
return (NULL);
break;
case SCTP_OPERATION_ERROR:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
*offset = length;
return (NULL);
}
break;
case SCTP_COOKIE_ECHO:
SCTPDBG(SCTP_DEBUG_INPUT3,
"SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
;
} else {
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
abend:
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
*offset = length;
return (NULL);
}
}
/*-
* First are we accepting? We do this again here
* since it is possible that a previous endpoint WAS
* listening responded to a INIT-ACK and then
* closed. We opened and bound.. and are now no
* longer listening.
*
* XXXGL: notes on checking listen queue length.
* 1) SCTP_IS_LISTENING() doesn't necessarily mean
* SOLISTENING(), because a listening "UDP type"
* socket isn't listening in terms of the socket
* layer. It is a normal data flow socket, that
* can fork off new connections. Thus, we should
* look into sol_qlen only in case we are !UDP.
* 2) Checking sol_qlen in general requires locking
* the socket, and this code lacks that.
*/
if ((stcb == NULL) &&
(!SCTP_IS_LISTENING(inp) ||
(!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
#if defined(__FreeBSD__) && !defined(__Userspace__)
inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
#else
inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit))) {
#endif
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, stcb, m, iphlen,
src, dst, sh, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid,
#endif
vrf_id, port);
}
*offset = length;
return (NULL);
} else {
struct mbuf *ret_buf;
struct sctp_inpcb *linp;
struct sctp_tmit_chunk *chk;
if (stcb) {
linp = NULL;
} else {
linp = inp;
}
if (linp != NULL) {
SCTP_ASOC_CREATE_LOCK(linp);
if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
SCTP_ASOC_CREATE_UNLOCK(linp);
goto abend;
}
}
if (netp != NULL) {
struct sctp_tcb *locked_stcb;
locked_stcb = stcb;
ret_buf =
sctp_handle_cookie_echo(m, iphlen,
*offset,
src, dst,
sh,
(struct sctp_cookie_echo_chunk *)ch,
&inp, &stcb, netp,
auth_skipped,
auth_offset,
auth_len,
&locked_stcb,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype,
mflowid,
#endif
vrf_id,
port);
if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
SCTP_TCB_UNLOCK(locked_stcb);
}
if (stcb != NULL) {
SCTP_TCB_LOCK_ASSERT(stcb);
}
} else {
ret_buf = NULL;
}
if (linp != NULL) {
SCTP_ASOC_CREATE_UNLOCK(linp);
}
if (ret_buf == NULL) {
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
SCTPDBG(SCTP_DEBUG_INPUT3,
"GAK, null buffer\n");
*offset = length;
return (NULL);
}
/* if AUTH skipped, see if it verified... */
if (auth_skipped) {
got_auth = 1;
auth_skipped = 0;
}
/* Restart the timer if we have pending data */
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if (chk->whoTo != NULL) {
break;
}
}
if (chk != NULL) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
}
}
break;
case SCTP_COOKIE_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
return (stcb);
}
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
;
} else if (stcb) {
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(inp);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
*offset = length;
return (NULL);
}
}
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
}
break;
case SCTP_ECN_ECHO:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb->asoc.ecn_supported == 0) {
goto unknown_chunk;
}
sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
ecne_seen = 1;
break;
case SCTP_ECN_CWR:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
*offset = length;
return (stcb);
}
if (stcb->asoc.ecn_supported == 0) {
goto unknown_chunk;
}
sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
break;
case SCTP_SHUTDOWN_COMPLETE:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
/* must be first and only chunk */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
stcb, *netp);
}
*offset = length;
return (NULL);
break;
case SCTP_ASCONF:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
if (stcb != NULL) {
if (stcb->asoc.asconf_supported == 0) {
goto unknown_chunk;
}
sctp_handle_asconf(m, *offset, src,
(struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
asconf_cnt++;
}
break;
case SCTP_ASCONF_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (stcb->asoc.asconf_supported == 0) {
goto unknown_chunk;
}
/* He's alive so give him credit */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
sctp_handle_asconf_ack(m, *offset,
(struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
if (abort_no_unlock)
return (NULL);
}
break;
case SCTP_FORWARD_CUM_TSN:
case SCTP_IFORWARD_CUM_TSN:
SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb != NULL) {
int abort_flag = 0;
if (stcb->asoc.prsctp_supported == 0) {
goto unknown_chunk;
}
if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
} else {
SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
}
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
*offset = length;
return (NULL);
}
*fwd_tsn_seen = 1;
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
#if defined(__APPLE__) && !defined(__Userspace__)
so = SCTP_INP_SO(inp);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
*offset = length;
return (NULL);
}
/*
* For sending a SACK this looks like DATA
* chunks.
*/
stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
sctp_handle_forward_tsn(stcb,
(struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
if (abort_flag) {
*offset = length;
return (NULL);
}
}
break;
case SCTP_STREAM_RESET:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb->asoc.reconfig_supported == 0) {
goto unknown_chunk;
}
if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
/* stop processing */
*offset = length;
return (NULL);
}
break;
case SCTP_PACKET_DROPPED:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
/* re-get it all please */
if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (stcb->asoc.pktdrop_supported == 0) {
goto unknown_chunk;
}
sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
stcb, *netp,
min(chk_length, contiguous));
}
break;
case SCTP_AUTHENTICATION:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
if (stcb == NULL) {
/* save the first AUTH for later processing */
if (auth_skipped == 0) {
auth_offset = *offset;
auth_len = chk_length;
auth_skipped = 1;
}
/* skip this chunk (temporarily) */
goto next_chunk;
}
if (stcb->asoc.auth_supported == 0) {
goto unknown_chunk;
}
if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
(chk_length > (sizeof(struct sctp_auth_chunk) +
SCTP_AUTH_DIGEST_LEN_MAX))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (got_auth == 1) {
/* skip this chunk... it's already auth'd */
goto next_chunk;
}
got_auth = 1;
if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
/* auth HMAC failed so dump the packet */
*offset = length;
return (stcb);
} else {
/* remaining chunks are HMAC checked */
stcb->asoc.authenticated = 1;
}
break;
default:
unknown_chunk:
/* it's an unknown chunk! */
if ((ch->chunk_type & 0x40) &&
(stcb != NULL) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
struct sctp_gen_error_cause *cause;
int len;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
cause = mtod(op_err, struct sctp_gen_error_cause *);
cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
if (SCTP_BUF_NEXT(op_err) != NULL) {
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
}
#endif
sctp_queue_op_err(stcb, op_err);
} else {
sctp_m_freem(op_err);
}
}
}
if ((ch->chunk_type & 0x80) == 0) {
/* discard this packet */
*offset = length;
return (stcb);
} /* else skip this bad chunk and continue... */
break;
} /* switch (ch->chunk_type) */
next_chunk:
/* get the next chunk */
*offset += SCTP_SIZE32(chk_length);
if (*offset >= length) {
/* no more data left in the mbuf chain */
break;
}
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_chunkhdr), chunk_buf);
if (ch == NULL) {
*offset = length;
return (stcb);
}
} /* while */
if ((asconf_cnt > 0) && (stcb != NULL)) {
sctp_send_asconf_ack(stcb);
}
return (stcb);
}
/*
* common input chunk processing (v4 and v6)
*/
void
sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_chunkhdr *ch,
uint8_t compute_crc,
uint8_t ecn_bits,
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
#endif
uint32_t vrf_id, uint16_t port)
{
uint32_t high_tsn;
int fwd_tsn_seen = 0, data_processed = 0;
struct mbuf *m = *mm, *op_err;
char msg[SCTP_DIAG_INFO_LEN];
int un_sent;
int cnt_ctrl_ready = 0;
struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
struct sctp_tcb *stcb = NULL;
struct sctp_nets *net = NULL;
#if defined(__Userspace__)
struct socket *upcall_socket = NULL;
#endif
SCTP_STAT_INCR(sctps_recvdatagrams);
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 1);
sctp_auditing(0, inp, stcb, net);
#endif
if (compute_crc != 0) {
uint32_t check, calc_check;
check = sh->checksum;
sh->checksum = 0;
calc_check = sctp_calculate_cksum(m, iphlen);
sh->checksum = check;
if (calc_check != check) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
calc_check, check, (void *)m, length, iphlen);
stcb = sctp_findassociation_addr(m, offset, src, dst,
sh, ch, &inp, &net, vrf_id);
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (net != NULL) {
net->flowtype = mflowtype;
net->flowid = mflowid;
}
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
if ((inp != NULL) && (stcb != NULL)) {
sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
} else if ((inp != NULL) && (stcb == NULL)) {
inp_decr = inp;
}
SCTP_STAT_INCR(sctps_badsum);
SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
goto out;
}
}
/* Destination port of 0 is illegal, based on RFC4960. */
if (sh->dest_port == 0) {
SCTP_STAT_INCR(sctps_hdrops);
goto out;
}
stcb = sctp_findassociation_addr(m, offset, src, dst,
sh, ch, &inp, &net, vrf_id);
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (net != NULL) {
net->flowtype = mflowtype;
net->flowid = mflowid;
}
#endif
if (inp == NULL) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
SCTP_STAT_INCR(sctps_noport);
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
goto out;
}
#endif
if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
sctp_send_shutdown_complete2(src, dst, sh,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
goto out;
}
if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
goto out;
}
if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
(ch->chunk_type != SCTP_INIT))) {
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Out of the blue");
sctp_send_abort(m, iphlen, src, dst,
sh, 0, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
}
}
goto out;
} else if (stcb == NULL) {
inp_decr = inp;
}
SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
(void *)m, iphlen, offset, length, (void *)stcb);
if (stcb) {
/* always clear this before beginning a packet */
stcb->asoc.authenticated = 0;
stcb->asoc.seen_a_sack_this_pkt = 0;
SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
(void *)stcb, stcb->asoc.state);
if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
(stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
/*-
* If we hit here, we had a ref count
* up when the assoc was aborted and the
* timer is clearing out the assoc, we should
* NOT respond to any packet.. its OOTB.
*/
SCTP_TCB_UNLOCK(stcb);
stcb = NULL;
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, port);
goto out;
}
}
#if defined(__Userspace__)
if ((stcb != NULL) &&
!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) &&
(stcb->sctp_socket != NULL)) {
if (stcb->sctp_socket->so_head != NULL) {
upcall_socket = stcb->sctp_socket->so_head;
} else {
upcall_socket = stcb->sctp_socket;
}
SOCK_LOCK(upcall_socket);
soref(upcall_socket);
SOCK_UNLOCK(upcall_socket);
}
#endif
if (IS_SCTP_CONTROL(ch)) {
/* process the control portion of the SCTP packet */
/* sa_ignore NO_NULL_CHK */
stcb = sctp_process_control(m, iphlen, &offset, length,
src, dst, sh, ch,
inp, stcb, &net, &fwd_tsn_seen,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
if (stcb) {
/* This covers us if the cookie-echo was there
* and it changes our INP.
*/
inp = stcb->sctp_ep;
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
}
} else {
/*
* no control chunks, so pre-process DATA chunks (these
* checks are taken care of by control processing)
*/
/*
* if DATA only packet, and auth is required, then punt...
* can't have authenticated without any AUTH (control)
* chunks
*/
if ((stcb != NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
/* "silently" ignore */
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
SCTP_STAT_INCR(sctps_recvauthmissing);
goto out;
}
if (stcb == NULL) {
/* out of the blue DATA chunk */
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
#endif
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
goto out;
}
if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
/* v_tag mismatch! */
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
SCTP_STAT_INCR(sctps_badvtag);
goto out;
}
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
#endif
if (stcb == NULL) {
/*
* no valid TCB for this packet, or we found it's a bad
* packet while processing control, or we're done with this
* packet (done or skip rest of data), so we drop it...
*/
goto out;
}
#if defined(__Userspace__)
if ((upcall_socket == NULL) &&
!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) &&
(stcb->sctp_socket != NULL)) {
if (stcb->sctp_socket->so_head != NULL) {
upcall_socket = stcb->sctp_socket->so_head;
} else {
upcall_socket = stcb->sctp_socket;
}
SOCK_LOCK(upcall_socket);
soref(upcall_socket);
SOCK_UNLOCK(upcall_socket);
}
#endif
/*
* DATA chunk processing
*/
/* plow through the data chunks while length > offset */
/*
* Rest should be DATA only. Check authentication state if AUTH for
* DATA is required.
*/
if ((length > offset) &&
(stcb != NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
!stcb->asoc.authenticated) {
/* "silently" ignore */
SCTP_STAT_INCR(sctps_recvauthmissing);
SCTPDBG(SCTP_DEBUG_AUTH1,
"Data chunk requires AUTH, skipped\n");
goto trigger_send;
}
if (length > offset) {
int retval;
/*
* First check to make sure our state is correct. We would
* not get here unless we really did have a tag, so we don't
* abort if this happens, just dump the chunk silently.
*/
switch (SCTP_GET_STATE(stcb)) {
case SCTP_STATE_COOKIE_ECHOED:
/*
* we consider data with valid tags in this state
* shows us the cookie-ack was lost. Imply it was
* there.
*/
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
break;
case SCTP_STATE_COOKIE_WAIT:
/*
* We consider OOTB any data sent during asoc setup.
*/
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, inp->fibnum,
#endif
vrf_id, port);
goto out;
/*sa_ignore NOTREACHED*/
break;
case SCTP_STATE_EMPTY: /* should not happen */
case SCTP_STATE_INUSE: /* should not happen */
case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
case SCTP_STATE_SHUTDOWN_ACK_SENT:
default:
goto out;
/*sa_ignore NOTREACHED*/
break;
case SCTP_STATE_OPEN:
case SCTP_STATE_SHUTDOWN_SENT:
break;
}
/* plow through the data chunks while length > offset */
retval = sctp_process_data(mm, iphlen, &offset, length,
inp, stcb, net, &high_tsn);
if (retval == 2) {
/*
* The association aborted, NO UNLOCK needed since
* the association is destroyed.
*/
stcb = NULL;
goto out;
}
data_processed = 1;
/*
* Anything important needs to have been m_copy'ed in
* process_data
*/
}
/* take care of ecn */
if ((data_processed == 1) &&
(stcb->asoc.ecn_supported == 1) &&
((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
/* Yep, we need to add a ECNE */
sctp_send_ecn_echo(stcb, net, high_tsn);
}
if ((data_processed == 0) && (fwd_tsn_seen)) {
int was_a_gap;
uint32_t highest_tsn;
if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
} else {
highest_tsn = stcb->asoc.highest_tsn_inside_map;
}
was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
stcb->asoc.send_sack = 1;
sctp_sack_check(stcb, was_a_gap);
} else if (fwd_tsn_seen) {
stcb->asoc.send_sack = 1;
}
/* trigger send of any chunks in queue... */
trigger_send:
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 2);
sctp_auditing(1, inp, stcb, net);
#endif
SCTPDBG(SCTP_DEBUG_INPUT1,
"Check for chunk output prw:%d tqe:%d tf=%d\n",
stcb->asoc.peers_rwnd,
TAILQ_EMPTY(&stcb->asoc.control_send_queue),
stcb->asoc.total_flight);
un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
}
if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
cnt_ctrl_ready ||
stcb->asoc.trigger_reset ||
((un_sent > 0) &&
(stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 3);
sctp_auditing(2, inp, stcb, net);
#endif
out:
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
#if defined(__Userspace__)
if (upcall_socket != NULL) {
if (upcall_socket->so_upcall != NULL) {
if (soreadable(upcall_socket) ||
sowriteable(upcall_socket) ||
upcall_socket->so_error) {
(*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT);
}
}
ACCEPT_LOCK();
SOCK_LOCK(upcall_socket);
sorele(upcall_socket);
}
#endif
if (inp_decr != NULL) {
/* reduce ref-count */
SCTP_INP_WLOCK(inp_decr);
SCTP_INP_DECR_REF(inp_decr);
SCTP_INP_WUNLOCK(inp_decr);
}
return;
}
#ifdef INET
#if !defined(__Userspace__)
void
sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
{
struct mbuf *m;
int iphlen;
uint32_t vrf_id = 0;
uint8_t ecn_bits;
struct sockaddr_in src, dst;
struct ip *ip;
struct sctphdr *sh;
struct sctp_chunkhdr *ch;
int length, offset;
uint8_t compute_crc;
#if defined(__FreeBSD__) && !defined(__Userspace__)
uint32_t mflowid;
uint8_t mflowtype;
uint16_t fibnum;
#endif
#if defined(__Userspace__)
uint16_t port = 0;
#endif
iphlen = off;
if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
SCTP_RELEASE_PKT(i_pak);
return;
}
m = SCTP_HEADER_TO_CHAIN(i_pak);
#ifdef SCTP_MBUF_LOGGING
/* Log in any input mbufs */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(m, SCTP_MBUF_INPUT);
}
#endif
#ifdef SCTP_PACKET_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
sctp_packet_log(m);
}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
"sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
m->m_pkthdr.len,
if_name(m->m_pkthdr.rcvif),
(int)m->m_pkthdr.csum_flags, CSUM_BITS);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
"sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
m->m_pkthdr.len,
m->m_pkthdr.rcvif->if_name,
m->m_pkthdr.rcvif->if_unit,
m->m_pkthdr.csum_flags);
#endif
#if defined(_WIN32) && !defined(__Userspace__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
"sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
m->m_pkthdr.len,
m->m_pkthdr.rcvif->if_xname,
m->m_pkthdr.csum_flags);
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowid = m->m_pkthdr.flowid;
mflowtype = M_HASHTYPE_GET(m);
fibnum = M_GETFIB(m);
#endif
SCTP_STAT_INCR(sctps_recvpackets);
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
/* Get IP, SCTP, and first chunk header together in the first mbuf. */
offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
if (SCTP_BUF_LEN(m) < offset) {
if ((m = m_pullup(m, offset)) == NULL) {
SCTP_STAT_INCR(sctps_hdrops);
return;
}
}
ip = mtod(m, struct ip *);
sh = (struct sctphdr *)((caddr_t)ip + iphlen);
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
offset -= sizeof(struct sctp_chunkhdr);
memset(&src, 0, sizeof(struct sockaddr_in));
src.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
src.sin_len = sizeof(struct sockaddr_in);
#endif
src.sin_port = sh->src_port;
src.sin_addr = ip->ip_src;
memset(&dst, 0, sizeof(struct sockaddr_in));
dst.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
dst.sin_len = sizeof(struct sockaddr_in);
#endif
dst.sin_port = sh->dest_port;
dst.sin_addr = ip->ip_dst;
#if defined(_WIN32) && !defined(__Userspace__)
NTOHS(ip->ip_len);
#endif
#if defined(__linux__) || (defined(_WIN32) && defined(__Userspace__))
ip->ip_len = ntohs(ip->ip_len);
#endif
#if defined(__Userspace__)
#if defined(__linux__) || defined(_WIN32)
length = ip->ip_len;
#else
length = ip->ip_len + iphlen;
#endif
#elif defined(__FreeBSD__)
length = ntohs(ip->ip_len);
#elif defined(__APPLE__)
length = ip->ip_len + iphlen;
#else
length = ip->ip_len;
#endif
/* Validate mbuf chain length with IP payload length. */
if (SCTP_HEADER_LEN(m) != length) {
SCTPDBG(SCTP_DEBUG_INPUT1,
"sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
SCTP_STAT_INCR(sctps_hdrops);
goto out;
}
/* SCTP does not allow broadcasts or multicasts */
if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
goto out;
}
if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
goto out;
}
ecn_bits = ip->ip_tos;
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
SCTP_STAT_INCR(sctps_recvhwcrc);
compute_crc = 0;
} else {
#else
if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
(SCTP_IS_IT_LOOPBACK(m)))) {
SCTP_STAT_INCR(sctps_recvhwcrc);
compute_crc = 0;
} else {
#endif
SCTP_STAT_INCR(sctps_recvswcrc);
compute_crc = 1;
}
sctp_common_input_processing(&m, iphlen, offset, length,
(struct sockaddr *)&src,
(struct sockaddr *)&dst,
sh, ch,
compute_crc,
ecn_bits,
#if defined(__FreeBSD__) && !defined(__Userspace__)
mflowtype, mflowid, fibnum,
#endif
vrf_id, port);
out:
if (m) {
sctp_m_freem(m);
}
return;
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
#if defined(SCTP_MCORE_INPUT) && defined(SMP)
extern int *sctp_cpuarry;
#endif
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
int
sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
{
struct mbuf *m;
int off;
m = *mp;
off = *offp;
#else
void
sctp_input(struct mbuf *m, int off)
{
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
#if defined(SCTP_MCORE_INPUT) && defined(SMP)
if (mp_ncpus > 1) {
struct ip *ip;
struct sctphdr *sh;
int offset;
int cpu_to_use;
uint32_t flowid, tag;
if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
flowid = m->m_pkthdr.flowid;
} else {
/* No flow id built by lower layers
* fix it so we create one.
*/
offset = off + sizeof(struct sctphdr);
if (SCTP_BUF_LEN(m) < offset) {
if ((m = m_pullup(m, offset)) == NULL) {
SCTP_STAT_INCR(sctps_hdrops);
return (IPPROTO_DONE);
}
}
ip = mtod(m, struct ip *);
sh = (struct sctphdr *)((caddr_t)ip + off);
tag = htonl(sh->v_tag);
flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
m->m_pkthdr.flowid = flowid;
M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
}
cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
sctp_queue_to_mcore(m, off, cpu_to_use);
return (IPPROTO_DONE);
}
#endif
#endif
sctp_input_with_port(m, off, 0);
#if defined(__FreeBSD__) && !defined(__Userspace__)
return (IPPROTO_DONE);
#endif
}
#endif
#endif
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