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gstreamer/subprojects/gst-plugins-bad/ext/sctp/usrsctp/usrsctplib/user_mbuf.h

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/*-
* Copyright (c) 1982, 1986, 1988, 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.
* 3. 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.
*
*/
#ifndef _USER_MBUF_H_
#define _USER_MBUF_H_
/* __Userspace__ header file for mbufs */
#include <stdio.h>
#if !defined(SCTP_SIMPLE_ALLOCATOR)
#include "umem.h"
#endif
#include "user_malloc.h"
#include "netinet/sctp_os_userspace.h"
#define USING_MBUF_CONSTRUCTOR 0
/* For Linux */
#ifndef MSIZE
#define MSIZE 256
/* #define MSIZE 1024 */
#endif
#ifndef MCLBYTES
#define MCLBYTES 2048
#endif
struct mbuf * m_gethdr(int how, short type);
struct mbuf * m_get(int how, short type);
struct mbuf * m_free(struct mbuf *m);
void m_clget(struct mbuf *m, int how);
struct mbuf * m_getm2(struct mbuf *m, int len, int how, short type, int flags, int allonebuf);
struct mbuf *m_uiotombuf(struct uio *uio, int how, int len, int align, int flags);
u_int m_length(struct mbuf *m0, struct mbuf **last);
struct mbuf *m_last(struct mbuf *m);
/* mbuf initialization function */
void mbuf_initialize(void *);
#define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
#define MGET(m, how, type) ((m) = m_get((how), (type)))
#define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type)))
#define MCLGET(m, how) m_clget((m), (how))
#define M_HDR_PAD ((sizeof(intptr_t)==4) ? 2 : 6) /* modified for __Userspace__ */
/* Length to m_copy to copy all. */
#define M_COPYALL 1000000000
/* umem_cache_t is defined in user_include/umem.h as
* typedef struct umem_cache umem_cache_t;
* Note:umem_zone_t is a pointer.
*/
#if defined(SCTP_SIMPLE_ALLOCATOR)
typedef size_t sctp_zone_t;
#else
typedef umem_cache_t *sctp_zone_t;
#endif
extern sctp_zone_t zone_mbuf;
extern sctp_zone_t zone_clust;
extern sctp_zone_t zone_ext_refcnt;
/*-
* Macros for type conversion:
* mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
* dtom(x) -- Convert data pointer within mbuf to mbuf pointer (XXX).
*/
#define mtod(m, t) ((t)((m)->m_data))
#define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1)))
struct mb_args {
int flags; /* Flags for mbuf being allocated */
short type; /* Type of mbuf being allocated */
};
struct clust_args {
struct mbuf * parent_mbuf;
};
struct mbuf * m_split(struct mbuf *, int, int);
void m_cat(struct mbuf *m, struct mbuf *n);
void m_adj(struct mbuf *, int);
void mb_free_ext(struct mbuf *);
void m_freem(struct mbuf *);
struct m_tag *m_tag_alloc(uint32_t, int, int, int);
struct mbuf *m_copym(struct mbuf *, int, int, int);
void m_copyback(struct mbuf *, int, int, caddr_t);
struct mbuf *m_pullup(struct mbuf *, int);
struct mbuf *m_pulldown(struct mbuf *, int off, int len, int *offp);
int m_dup_pkthdr(struct mbuf *, struct mbuf *, int);
struct m_tag *m_tag_copy(struct m_tag *, int);
int m_tag_copy_chain(struct mbuf *, struct mbuf *, int);
struct mbuf *m_prepend(struct mbuf *, int, int);
void m_copydata(const struct mbuf *, int, int, caddr_t);
#define MBUF_MEM_NAME "mbuf"
#define MBUF_CLUSTER_MEM_NAME "mbuf_cluster"
#define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
#define MT_NOINIT 255 /* Not a type but a flag to allocate
a non-initialized mbuf */
/*
* Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead.
* An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in
* sys/param.h), which has no additional overhead and is used instead of the
* internal data area; this is done when at least MINCLSIZE of data must be
* stored. Additionally, it is possible to allocate a separate buffer
* externally and attach it to the mbuf in a way similar to that of mbuf
* clusters.
*/
#define MLEN ((int)(MSIZE - sizeof(struct m_hdr))) /* normal data len */
#define MHLEN ((int)(MLEN - sizeof(struct pkthdr))) /* data len w/pkthdr */
#define MINCLSIZE ((int)(MHLEN + 1)) /* smallest amount to put in cluster */
#define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
/*
* Header present at the beginning of every mbuf.
*/
struct m_hdr {
struct mbuf *mh_next; /* next buffer in chain */
struct mbuf *mh_nextpkt; /* next chain in queue/record */
caddr_t mh_data; /* location of data */
int mh_len; /* amount of data in this mbuf */
int mh_flags; /* flags; see below */
short mh_type; /* type of data in this mbuf */
uint8_t pad[M_HDR_PAD];/* word align */
};
/*
* Packet tag structure (see below for details).
*/
struct m_tag {
SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
uint16_t m_tag_id; /* Tag ID */
uint16_t m_tag_len; /* Length of data */
uint32_t m_tag_cookie; /* ABI/Module ID */
void (*m_tag_free)(struct m_tag *);
};
/*
* Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
*/
struct pkthdr {
struct ifnet *rcvif; /* rcv interface */
/* variables for ip and tcp reassembly */
void *header; /* pointer to packet header */
int len; /* total packet length */
/* variables for hardware checksum */
int csum_flags; /* flags regarding checksum */
int csum_data; /* data field used by csum routines */
uint16_t tso_segsz; /* TSO segment size */
uint16_t ether_vtag; /* Ethernet 802.1p+q vlan tag */
SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
};
/*
* Description of external storage mapped into mbuf; valid only if M_EXT is
* set.
*/
struct m_ext {
caddr_t ext_buf; /* start of buffer */
void (*ext_free) /* free routine if not the usual */
(void *, void *);
void *ext_args; /* optional argument pointer */
u_int ext_size; /* size of buffer, for ext_free */
volatile u_int *ref_cnt; /* pointer to ref count info */
int ext_type; /* type of external storage */
};
/*
* The core of the mbuf object along with some shortcut defined for practical
* purposes.
*/
struct mbuf {
struct m_hdr m_hdr;
union {
struct {
struct pkthdr MH_pkthdr; /* M_PKTHDR set */
union {
struct m_ext MH_ext; /* M_EXT set */
char MH_databuf[MHLEN];
} MH_dat;
} MH;
char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
} M_dat;
};
#define m_next m_hdr.mh_next
#define m_len m_hdr.mh_len
#define m_data m_hdr.mh_data
#define m_type m_hdr.mh_type
#define m_flags m_hdr.mh_flags
#define m_nextpkt m_hdr.mh_nextpkt
#define m_act m_nextpkt
#define m_pkthdr M_dat.MH.MH_pkthdr
#define m_ext M_dat.MH.MH_dat.MH_ext
#define m_pktdat M_dat.MH.MH_dat.MH_databuf
#define m_dat M_dat.M_databuf
/*
* mbuf flags.
*/
#define M_EXT 0x0001 /* has associated external storage */
#define M_PKTHDR 0x0002 /* start of record */
#define M_EOR 0x0004 /* end of record */
#define M_RDONLY 0x0008 /* associated data is marked read-only */
#define M_PROTO1 0x0010 /* protocol-specific */
#define M_PROTO2 0x0020 /* protocol-specific */
#define M_PROTO3 0x0040 /* protocol-specific */
#define M_PROTO4 0x0080 /* protocol-specific */
#define M_PROTO5 0x0100 /* protocol-specific */
#define M_FREELIST 0x8000 /* mbuf is on the free list */
/*
* Flags copied when copying m_pkthdr.
*/
#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_RDONLY|M_PROTO1|M_PROTO1|M_PROTO2|\
M_PROTO3|M_PROTO4|M_PROTO5|\
M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG|\
M_VLANTAG|M_PROMISC)
/*
* mbuf pkthdr flags (also stored in m_flags).
*/
#define M_BCAST 0x0200 /* send/received as link-level broadcast */
#define M_MCAST 0x0400 /* send/received as link-level multicast */
#define M_FRAG 0x0800 /* packet is a fragment of a larger packet */
#define M_FIRSTFRAG 0x1000 /* packet is first fragment */
#define M_LASTFRAG 0x2000 /* packet is last fragment */
#define M_VLANTAG 0x10000 /* ether_vtag is valid */
#define M_PROMISC 0x20000 /* packet was not for us */
#define M_NOFREE 0x40000 /* do not free mbuf - it is embedded in the cluster */
/*
* External buffer types: identify ext_buf type.
*/
#define EXT_CLUSTER 1 /* mbuf cluster */
#define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */
#define EXT_JUMBOP 3 /* jumbo cluster 4096 bytes */
#define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */
#define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
#define EXT_PACKET 6 /* mbuf+cluster from packet zone */
#define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */
#define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */
#define EXT_MOD_TYPE 200 /* custom module's ext_buf type */
#define EXT_DISPOSABLE 300 /* can throw this buffer away w/page flipping */
#define EXT_EXTREF 400 /* has externally maintained ref_cnt ptr */
/*
* mbuf types.
*/
#define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
#define MT_DATA 1 /* dynamic (data) allocation */
#define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */
#define MT_SONAME 8 /* socket name */
#define MT_CONTROL 14 /* extra-data protocol message */
#define MT_OOBDATA 15 /* expedited data */
#define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
#define MT_NOINIT 255 /* Not a type but a flag to allocate
a non-initialized mbuf */
/*
* __Userspace__ flags like M_NOWAIT are defined in malloc.h
* Flags like these are used in functions like uma_zalloc()
* but don't have an equivalent in userland umem
* Flags specifying how an allocation should be made.
*
* The flag to use is as follows:
* - M_DONTWAIT or M_NOWAIT from an interrupt handler to not block allocation.
* - M_WAIT or M_WAITOK or M_TRYWAIT from wherever it is safe to block.
*
* M_DONTWAIT/M_NOWAIT means that we will not block the thread explicitly and
* if we cannot allocate immediately we may return NULL, whereas
* M_WAIT/M_WAITOK/M_TRYWAIT means that if we cannot allocate resources we
* will block until they are available, and thus never return NULL.
*
* XXX Eventually just phase this out to use M_WAITOK/M_NOWAIT.
*/
#define MBTOM(how) (how)
void m_tag_delete(struct mbuf *, struct m_tag *);
void m_tag_delete_chain(struct mbuf *, struct m_tag *);
void m_move_pkthdr(struct mbuf *, struct mbuf *);
void m_tag_free_default(struct m_tag *);
extern int max_linkhdr; /* Largest link-level header */
extern int max_protohdr; /* Size of largest protocol layer header. See user_mbuf.c */
/*
* Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
* be both the local data payload, or an external buffer area, depending on
* whether M_EXT is set).
*/
#define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \
(!(((m)->m_flags & M_EXT)) || \
(*((m)->m_ext.ref_cnt) == 1)) ) \
/*
* Compute the amount of space available before the current start of data in
* an mbuf.
*
* The M_WRITABLE() is a temporary, conservative safety measure: the burden
* of checking writability of the mbuf data area rests solely with the caller.
*/
#define M_LEADINGSPACE(m) \
(((m)->m_flags & M_EXT) ? \
(M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
((m)->m_flags & M_PKTHDR)? (m)->m_data - (m)->m_pktdat : \
(m)->m_data - (m)->m_dat)
/*
* Compute the amount of space available after the end of data in an mbuf.
*
* The M_WRITABLE() is a temporary, conservative safety measure: the burden
* of checking writability of the mbuf data area rests solely with the caller.
*/
#define M_TRAILINGSPACE(m) \
(((m)->m_flags & M_EXT) ? \
(M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
- ((m)->m_data + (m)->m_len) : 0) : \
&(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
/*
* Arrange to prepend space of size plen to mbuf m. If a new mbuf must be
* allocated, how specifies whether to wait. If the allocation fails, the
* original mbuf chain is freed and m is set to NULL.
*/
#define M_PREPEND(m, plen, how) do { \
struct mbuf **_mmp = &(m); \
struct mbuf *_mm = *_mmp; \
int _mplen = (plen); \
int __mhow = (how); \
\
if (M_LEADINGSPACE(_mm) >= _mplen) { \
_mm->m_data -= _mplen; \
_mm->m_len += _mplen; \
} else \
_mm = m_prepend(_mm, _mplen, __mhow); \
if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
_mm->m_pkthdr.len += _mplen; \
*_mmp = _mm; \
} while (0)
/*
* Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an
* object of the specified size at the end of the mbuf, longword aligned.
*/
#define M_ALIGN(m, len) do { \
KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)), \
("%s: M_ALIGN not normal mbuf", __func__)); \
KASSERT((m)->m_data == (m)->m_dat, \
("%s: M_ALIGN not a virgin mbuf", __func__)); \
(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
} while (0)
/*
* As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by
* M_DUP/MOVE_PKTHDR.
*/
#define MH_ALIGN(m, len) do { \
KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT), \
("%s: MH_ALIGN not PKTHDR mbuf", __func__)); \
KASSERT((m)->m_data == (m)->m_pktdat, \
("%s: MH_ALIGN not a virgin mbuf", __func__)); \
(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
} while (0)
#define M_SIZE(m) \
(((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \
((m)->m_flags & M_PKTHDR) ? MHLEN : \
MLEN)
#endif
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