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gstreamer/ext/sctp/usrsctp/usrsctplib/user_socketvar.h

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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>
2020-07-24 18:23:19 +00:00
/*-
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
*/
/* __Userspace__ version of <sys/socketvar.h> goes here.*/
#ifndef _USER_SOCKETVAR_H_
#define _USER_SOCKETVAR_H_
#if defined(__APPLE__)
#include <sys/types.h>
#include <unistd.h>
#endif
/* #include <sys/selinfo.h> */ /*__Userspace__ alternative?*/ /* for struct selinfo */
/* #include <sys/_lock.h> was 0 byte file */
/* #include <sys/_mutex.h> was 0 byte file */
/* #include <sys/_sx.h> */ /*__Userspace__ alternative?*/
#if !defined(__DragonFly__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(_WIN32) && !defined(__native_client__)
#include <sys/uio.h>
#endif
#define SOCK_MAXADDRLEN 255
#if !defined(MSG_NOTIFICATION)
#define MSG_NOTIFICATION 0x2000 /* SCTP notification */
#endif
#define SCTP_SO_LINGER 0x0001
#define SCTP_SO_ACCEPTCONN 0x0002
#define SS_CANTRCVMORE 0x020
#define SS_CANTSENDMORE 0x010
#if defined(__APPLE__) || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(_WIN32) || defined(__native_client__)
#define UIO_MAXIOV 1024
#define ERESTART (-1)
#endif
#if !defined(__APPLE__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
enum uio_rw { UIO_READ, UIO_WRITE };
#endif
#if !defined(__NetBSD__) && !defined(__OpenBSD__)
/* Segment flag values. */
enum uio_seg {
UIO_USERSPACE, /* from user data space */
UIO_SYSSPACE /* from system space */
};
#endif
struct proc {
int stub; /* struct proc is a dummy for __Userspace__ */
};
MALLOC_DECLARE(M_ACCF);
MALLOC_DECLARE(M_PCB);
MALLOC_DECLARE(M_SONAME);
/* __Userspace__ Are these all the fields we need?
* Removing struct thread *uio_td; owner field
*/
struct uio {
struct iovec *uio_iov; /* scatter/gather list */
int uio_iovcnt; /* length of scatter/gather list */
off_t uio_offset; /* offset in target object */
ssize_t uio_resid; /* remaining bytes to process */
enum uio_seg uio_segflg; /* address space */
enum uio_rw uio_rw; /* operation */
};
/* __Userspace__ */
/*
* Kernel structure per socket.
* Contains send and receive buffer queues,
* handle on protocol and pointer to protocol
* private data and error information.
*/
#if defined(_WIN32)
#define AF_ROUTE 17
#if !defined(__MINGW32__)
typedef __int32 pid_t;
#endif
typedef unsigned __int32 uid_t;
enum sigType {
SIGNAL = 0,
BROADCAST = 1,
MAX_EVENTS = 2
};
#endif
/*-
* Locking key to struct socket:
* (a) constant after allocation, no locking required.
* (b) locked by SOCK_LOCK(so).
* (c) locked by SOCKBUF_LOCK(&so->so_rcv).
* (d) locked by SOCKBUF_LOCK(&so->so_snd).
* (e) locked by ACCEPT_LOCK().
* (f) not locked since integer reads/writes are atomic.
* (g) used only as a sleep/wakeup address, no value.
* (h) locked by global mutex so_global_mtx.
*/
struct socket {
int so_count; /* (b) reference count */
short so_type; /* (a) generic type, see socket.h */
short so_options; /* from socket call, see socket.h */
short so_linger; /* time to linger while closing */
short so_state; /* (b) internal state flags SS_* */
int so_qstate; /* (e) internal state flags SQ_* */
void *so_pcb; /* protocol control block */
int so_dom;
/*
* Variables for connection queuing.
* Socket where accepts occur is so_head in all subsidiary sockets.
* If so_head is 0, socket is not related to an accept.
* For head socket so_incomp queues partially completed connections,
* while so_comp is a queue of connections ready to be accepted.
* If a connection is aborted and it has so_head set, then
* it has to be pulled out of either so_incomp or so_comp.
* We allow connections to queue up based on current queue lengths
* and limit on number of queued connections for this socket.
*/
struct socket *so_head; /* (e) back pointer to listen socket */
TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */
TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */
TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */
u_short so_qlen; /* (e) number of unaccepted connections */
u_short so_incqlen; /* (e) number of unaccepted incomplete
connections */
u_short so_qlimit; /* (e) max number queued connections */
short so_timeo; /* (g) connection timeout */
userland_cond_t timeo_cond; /* timeo_cond condition variable being used in wakeup */
u_short so_error; /* (f) error affecting connection */
struct sigio *so_sigio; /* [sg] information for async I/O or
out of band data (SIGURG) */
u_long so_oobmark; /* (c) chars to oob mark */
TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
/*
* Variables for socket buffering.
*/
struct sockbuf {
/* __Userspace__ Many of these fields may
* not be required for the sctp stack.
* Commenting out the following.
* Including pthread mutex and condition variable to be
* used by sbwait, sorwakeup and sowwakeup.
*/
/* struct selinfo sb_sel;*/ /* process selecting read/write */
/* struct mtx sb_mtx;*/ /* sockbuf lock */
/* struct sx sb_sx;*/ /* prevent I/O interlacing */
userland_cond_t sb_cond; /* sockbuf condition variable */
userland_mutex_t sb_mtx; /* sockbuf lock associated with sb_cond */
short sb_state; /* (c/d) socket state on sockbuf */
#define sb_startzero sb_mb
struct mbuf *sb_mb; /* (c/d) the mbuf chain */
struct mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
struct mbuf *sb_lastrecord; /* (c/d) first mbuf of last
* record in socket buffer */
struct mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
u_int sb_sndptroff; /* (c/d) byte offset of ptr into chain */
u_int sb_cc; /* (c/d) actual chars in buffer */
u_int sb_hiwat; /* (c/d) max actual char count */
u_int sb_mbcnt; /* (c/d) chars of mbufs used */
u_int sb_mbmax; /* (c/d) max chars of mbufs to use */
u_int sb_ctl; /* (c/d) non-data chars in buffer */
int sb_lowat; /* (c/d) low water mark */
int sb_timeo; /* (c/d) timeout for read/write */
short sb_flags; /* (c/d) flags, see below */
} so_rcv, so_snd;
/*
* Constants for sb_flags field of struct sockbuf.
*/
#define SB_MAX (256*1024) /* default for max chars in sockbuf */
#define SB_RAW (64*1024*2) /*Aligning so->so_rcv.sb_hiwat with the receive buffer size of raw socket*/
/*
* Constants for sb_flags field of struct sockbuf.
*/
#define SB_WAIT 0x04 /* someone is waiting for data/space */
#define SB_SEL 0x08 /* someone is selecting */
#define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
#define SB_UPCALL 0x20 /* someone wants an upcall */
#define SB_NOINTR 0x40 /* operations not interruptible */
#define SB_AIO 0x80 /* AIO operations queued */
#define SB_KNOTE 0x100 /* kernel note attached */
#define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
void (*so_upcall)(struct socket *, void *, int);
void *so_upcallarg;
struct ucred *so_cred; /* (a) user credentials */
struct label *so_label; /* (b) MAC label for socket */
struct label *so_peerlabel; /* (b) cached MAC label for peer */
/* NB: generation count must not be first. */
uint32_t so_gencnt; /* (h) generation count */
void *so_emuldata; /* (b) private data for emulators */
struct so_accf {
struct accept_filter *so_accept_filter;
void *so_accept_filter_arg; /* saved filter args */
char *so_accept_filter_str; /* saved user args */
} *so_accf;
};
#define SB_EMPTY_FIXUP(sb) do { \
if ((sb)->sb_mb == NULL) { \
(sb)->sb_mbtail = NULL; \
(sb)->sb_lastrecord = NULL; \
} \
} while (/*CONSTCOND*/0)
/*
* Global accept mutex to serialize access to accept queues and
* fields associated with multiple sockets. This allows us to
* avoid defining a lock order between listen and accept sockets
* until such time as it proves to be a good idea.
*/
#if defined(_WIN32)
extern userland_mutex_t accept_mtx;
extern userland_cond_t accept_cond;
#define ACCEPT_LOCK_ASSERT()
#define ACCEPT_LOCK() do { \
EnterCriticalSection(&accept_mtx); \
} while (0)
#define ACCEPT_UNLOCK() do { \
LeaveCriticalSection(&accept_mtx); \
} while (0)
#define ACCEPT_UNLOCK_ASSERT()
#else
extern userland_mutex_t accept_mtx;
extern userland_cond_t accept_cond;
#ifdef INVARIANTS
#define ACCEPT_LOCK() KASSERT(pthread_mutex_lock(&accept_mtx) == 0, ("%s: accept_mtx already locked", __func__))
#define ACCEPT_UNLOCK() KASSERT(pthread_mutex_unlock(&accept_mtx) == 0, ("%s: accept_mtx not locked", __func__))
#else
#define ACCEPT_LOCK() (void)pthread_mutex_lock(&accept_mtx)
#define ACCEPT_UNLOCK() (void)pthread_mutex_unlock(&accept_mtx)
#endif
#define ACCEPT_LOCK_ASSERT() \
KASSERT(pthread_mutex_trylock(&accept_mtx) == EBUSY, ("%s: accept_mtx not locked", __func__))
#define ACCEPT_UNLOCK_ASSERT() do { \
KASSERT(pthread_mutex_trylock(&accept_mtx) == 0, ("%s: accept_mtx locked", __func__)); \
(void)pthread_mutex_unlock(&accept_mtx); \
} while (0)
#endif
/*
* Per-socket buffer mutex used to protect most fields in the socket
* buffer.
*/
#define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
#if defined(_WIN32)
#define SOCKBUF_LOCK_INIT(_sb, _name) \
InitializeCriticalSection(SOCKBUF_MTX(_sb))
#define SOCKBUF_LOCK_DESTROY(_sb) DeleteCriticalSection(SOCKBUF_MTX(_sb))
#define SOCKBUF_COND_INIT(_sb) InitializeConditionVariable((&(_sb)->sb_cond))
#define SOCKBUF_COND_DESTROY(_sb) DeleteConditionVariable((&(_sb)->sb_cond))
#define SOCK_COND_INIT(_so) InitializeConditionVariable((&(_so)->timeo_cond))
#define SOCK_COND_DESTROY(_so) DeleteConditionVariable((&(_so)->timeo_cond))
#define SOCK_COND(_so) (&(_so)->timeo_cond)
#else
#ifdef INVARIANTS
#define SOCKBUF_LOCK_INIT(_sb, _name) do { \
pthread_mutexattr_t mutex_attr; \
\
pthread_mutexattr_init(&mutex_attr); \
pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_ERRORCHECK); \
pthread_mutex_init(SOCKBUF_MTX(_sb), &mutex_attr); \
pthread_mutexattr_destroy(&mutex_attr); \
} while (0)
#else
#define SOCKBUF_LOCK_INIT(_sb, _name) \
pthread_mutex_init(SOCKBUF_MTX(_sb), NULL)
#endif
#define SOCKBUF_LOCK_DESTROY(_sb) pthread_mutex_destroy(SOCKBUF_MTX(_sb))
#define SOCKBUF_COND_INIT(_sb) pthread_cond_init((&(_sb)->sb_cond), NULL)
#define SOCKBUF_COND_DESTROY(_sb) pthread_cond_destroy((&(_sb)->sb_cond))
#define SOCK_COND_INIT(_so) pthread_cond_init((&(_so)->timeo_cond), NULL)
#define SOCK_COND_DESTROY(_so) pthread_cond_destroy((&(_so)->timeo_cond))
#define SOCK_COND(_so) (&(_so)->timeo_cond)
#endif
/*__Userspace__ SOCKBUF_LOCK(_sb) is now defined in netinet/sctp_process_lock.h */
/* #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb)) unused */
/*__Userspace__ SOCKBUF_UNLOCK(_sb) is now defined in netinet/sctp_process_lock.h */
/*__Userspace__ SOCKBUF_LOCK_ASSERT(_sb) is now defined in netinet/sctp_process_lock.h */
/* #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED) unused */
/*
* Per-socket mutex: we reuse the receive socket buffer mutex for space
* efficiency. This decision should probably be revisited as we optimize
* locking for the socket code.
*/
#define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv)
/*__Userspace__ SOCK_LOCK(_so) is now defined in netinet/sctp_process_lock.h */
/* #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv) unused */
/*__Userspace__ SOCK_UNLOCK(_so) is now defined in netinet/sctp_process_lock.h */
#define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
/*
* Socket state bits.
*
* Historically, this bits were all kept in the so_state field. For
* locking reasons, they are now in multiple fields, as they are
* locked differently. so_state maintains basic socket state protected
* by the socket lock. so_qstate holds information about the socket
* accept queues. Each socket buffer also has a state field holding
* information relevant to that socket buffer (can't send, rcv). Many
* fields will be read without locks to improve performance and avoid
* lock order issues. However, this approach must be used with caution.
*/
#define SS_NOFDREF 0x0001 /* no file table ref any more */
#define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
#define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
#define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
#define SS_NBIO 0x0100 /* non-blocking ops */
#define SS_ASYNC 0x0200 /* async i/o notify */
#define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
#define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
/*
* Protocols can mark a socket as SS_PROTOREF to indicate that, following
* pru_detach, they still want the socket to persist, and will free it
* themselves when they are done. Protocols should only ever call sofree()
* following setting this flag in pru_detach(), and never otherwise, as
* sofree() bypasses socket reference counting.
*/
#define SS_PROTOREF 0x4000 /* strong protocol reference */
/*
* Socket state bits now stored in the socket buffer state field.
*/
#define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
#define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
#define SBS_RCVATMARK 0x0040 /* at mark on input */
/*
* Socket state bits stored in so_qstate.
*/
#define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */
#define SQ_COMP 0x1000 /* unaccepted, complete connection */
/*
* Socket event flags
*/
#define SCTP_EVENT_READ 0x0001 /* socket is readable */
#define SCTP_EVENT_WRITE 0x0002 /* socket is writeable */
#define SCTP_EVENT_ERROR 0x0004 /* socket has an error state */
/*-------------------------------------------------------------*/
/*-------------------------------------------------------------*/
/* __Userspace__ */
/*-------------------------------------------------------------*/
/*-------------------------------------------------------------*/
/* this new __Userspace__ section is to copy portions of the _KERNEL block
* above into, avoiding having to port the entire thing at once...
* For function prototypes, the full bodies are in user_socket.c .
*/
/* ---------------------------------------------------------- */
/* --- function prototypes (implemented in user_socket.c) --- */
/* ---------------------------------------------------------- */
void soisconnecting(struct socket *so);
void soisdisconnecting(struct socket *so);
void soisconnected(struct socket *so);
struct socket * sonewconn(struct socket *head, int connstatus);
void socantrcvmore(struct socket *so);
void socantsendmore(struct socket *so);
void sofree(struct socket *so);
/* -------------- */
/* --- macros --- */
/* -------------- */
#define soref(so) do { \
SOCK_LOCK_ASSERT(so); \
++(so)->so_count; \
} while (0)
#define sorele(so) do { \
ACCEPT_LOCK_ASSERT(); \
SOCK_LOCK_ASSERT(so); \
KASSERT((so)->so_count > 0, ("sorele")); \
if (--(so)->so_count == 0) \
sofree(so); \
else { \
SOCK_UNLOCK(so); \
ACCEPT_UNLOCK(); \
} \
} while (0)
/* replacing imin with min (user_environment.h) */
#define sbspace(sb) \
((long) min((int)((sb)->sb_hiwat - (sb)->sb_cc), \
(int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
/* do we have to send all at once on a socket? */
#define sosendallatonce(so) \
((so)->so_proto->pr_flags & PR_ATOMIC)
/* can we read something from so? */
#define soreadable(so) \
((int)((so)->so_rcv.sb_cc) >= (so)->so_rcv.sb_lowat || \
((so)->so_rcv.sb_state & SBS_CANTRCVMORE) || \
!TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
#if 0 /* original */
#define PR_CONNREQUIRED 0x04 /* from sys/protosw.h "needed" for sowriteable */
#define sowriteable(so) \
((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
(((so)->so_state&SS_ISCONNECTED) || \
((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
(so)->so_error)
#else /* line with PR_CONNREQUIRED removed */
/* can we write something to so? */
#define sowriteable(so) \
((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
(((so)->so_state&SS_ISCONNECTED))) || \
((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
(so)->so_error)
#endif
extern void solisten_proto(struct socket *so, int backlog);
extern int solisten_proto_check(struct socket *so);
extern int sctp_listen(struct socket *so, int backlog, struct proc *p);
extern void socantrcvmore_locked(struct socket *so);
extern int sctp_bind(struct socket *so, struct sockaddr *addr);
extern int sctp6_bind(struct socket *so, struct sockaddr *addr, void *proc);
extern int sctpconn_bind(struct socket *so, struct sockaddr *addr);
extern int sctp_accept(struct socket *so, struct sockaddr **addr);
extern int sctp_attach(struct socket *so, int proto, uint32_t vrf_id);
extern int sctp6_attach(struct socket *so, int proto, uint32_t vrf_id);
extern int sctp_abort(struct socket *so);
extern int sctp6_abort(struct socket *so);
extern void sctp_close(struct socket *so);
extern int soaccept(struct socket *so, struct sockaddr **nam);
extern int solisten(struct socket *so, int backlog);
extern int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
extern void sowakeup(struct socket *so, struct sockbuf *sb);
extern void wakeup(void *ident, struct socket *so); /*__Userspace__ */
extern int uiomove(void *cp, int n, struct uio *uio);
extern int sbwait(struct sockbuf *sb);
extern int sodisconnect(struct socket *so);
extern int soconnect(struct socket *so, struct sockaddr *nam);
extern int sctp_disconnect(struct socket *so);
extern int sctp_connect(struct socket *so, struct sockaddr *addr);
extern int sctp6_connect(struct socket *so, struct sockaddr *addr);
extern int sctpconn_connect(struct socket *so, struct sockaddr *addr);
extern void sctp_finish(void);
/* ------------------------------------------------ */
/* ----- macros copied from above ---- */
/* ------------------------------------------------ */
/*
* Do we need to notify the other side when I/O is possible?
*/
#define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
/*
* In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
* avoid a non-atomic test-and-wakeup. However, sowakeup is
* responsible for releasing the lock if it is called. We unlock only
* if we don't call into sowakeup. If any code is introduced that
* directly invokes the underlying sowakeup() primitives, it must
* maintain the same semantics.
*/
#define sorwakeup_locked(so) do { \
SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
if (sb_notify(&(so)->so_rcv)) \
sowakeup((so), &(so)->so_rcv); \
else \
SOCKBUF_UNLOCK(&(so)->so_rcv); \
} while (0)
#define sorwakeup(so) do { \
SOCKBUF_LOCK(&(so)->so_rcv); \
sorwakeup_locked(so); \
} while (0)
#define sowwakeup_locked(so) do { \
SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
if (sb_notify(&(so)->so_snd)) \
sowakeup((so), &(so)->so_snd); \
else \
SOCKBUF_UNLOCK(&(so)->so_snd); \
} while (0)
#define sowwakeup(so) do { \
SOCKBUF_LOCK(&(so)->so_snd); \
sowwakeup_locked(so); \
} while (0)
#endif /* !_SYS_SOCKETVAR_H_ */
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