2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * Copyright (c) 1982, 1986, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
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28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)mbuf.h 8.5 (Berkeley) 2/19/95
36 * $FreeBSD: src/sys/sys/mbuf.h,v 1.44.2.17 2003/04/15 06:15:02 silby Exp $
37 * $DragonFly: src/sys/sys/mbuf.h,v 1.37 2006/09/29 05:37:03 hsu Exp $
43 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
46 #include <sys/types.h>
49 #include <sys/param.h>
52 #include <sys/queue.h>
54 #ifndef _NET_NETISR_H_
55 #include <net/netisr.h>
59 * Mbufs are of a single size, MSIZE (machine/param.h), which
60 * includes overhead. An mbuf may add a single "mbuf cluster" of size
61 * MCLBYTES (also in machine/param.h), which has no additional overhead
62 * and is used instead of the internal data area; this is done when
63 * at least MINCLSIZE of data must be stored.
65 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
66 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
67 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */
68 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
71 * Macros for type conversion:
72 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
73 * mtocl(x) - convert pointer within cluster to cluster index #
74 * cltom(x) - convert cluster # to ptr to beginning of cluster
76 #define mtod(m, t) ((t)((m)->m_data))
79 * Header present at the beginning of every mbuf.
82 struct mbuf
*mh_next
; /* next buffer in chain */
83 struct mbuf
*mh_nextpkt
; /* next chain in queue/record */
84 caddr_t mh_data
; /* location of data */
85 int mh_len
; /* amount of data in this mbuf */
86 short mh_type
; /* type of data in this mbuf */
87 short mh_flags
; /* flags; see below */
88 struct netmsg_packet mh_netmsg
; /* hardware->proto stack msg */
92 * Packet tag structure (see below for details).
95 SLIST_ENTRY(m_tag
) m_tag_link
; /* List of packet tags */
96 u_int16_t m_tag_id
; /* Tag ID */
97 u_int16_t m_tag_len
; /* Length of data */
98 u_int32_t m_tag_cookie
; /* ABI/Module ID */
101 SLIST_HEAD(packet_tags
, m_tag
);
104 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
106 * Be careful: The fields have been carefully ordered to avoid hidden padding.
107 * Keep this in mind, when adding or removing fields!
110 struct ifnet
*rcvif
; /* rcv interface */
111 int len
; /* total packet length */
112 struct packet_tags tags
; /* list of packet tags */
114 /* variables for ip and tcp reassembly */
115 void *header
; /* pointer to packet header */
117 /* variables for hardware checksum */
118 int csum_flags
; /* flags regarding checksum */
119 int csum_data
; /* data field used by csum routines */
122 uint32_t fw_flags
; /* flags for PF */
124 /* variables for PF processing */
125 uint16_t pf_tag
; /* PF tag id */
126 uint8_t pf_routed
; /* PF routing counter */
128 /* variables for ALTQ processing */
129 uint8_t ecn_af
; /* address family for ECN */
130 uint32_t altq_qid
; /* queue id */
134 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
137 caddr_t ext_buf
; /* start of buffer */
138 void (*ext_free
)(void *);
139 u_int ext_size
; /* size of buffer, for ext_free */
140 void (*ext_ref
)(void *);
145 * The core of the mbuf object along with some shortcut defines for
146 * practical purposes.
152 struct pkthdr MH_pkthdr
; /* M_PKTHDR set */
154 struct m_ext MH_ext
; /* M_EXT set */
155 char MH_databuf
[MHLEN
];
158 char M_databuf
[MLEN
]; /* !M_PKTHDR, !M_EXT */
161 #define m_next m_hdr.mh_next
162 #define m_len m_hdr.mh_len
163 #define m_data m_hdr.mh_data
164 #define m_type m_hdr.mh_type
165 #define m_flags m_hdr.mh_flags
166 #define m_nextpkt m_hdr.mh_nextpkt
167 #define m_pkthdr M_dat.MH.MH_pkthdr
168 #define m_ext M_dat.MH.MH_dat.MH_ext
169 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
170 #define m_dat M_dat.M_databuf
173 * Code that uses m_act should be converted to use m_nextpkt
174 * instead; m_act is historical and deprecated.
176 #define m_act m_nextpkt
181 #define M_EXT 0x0001 /* has associated external storage */
182 #define M_PKTHDR 0x0002 /* start of record */
183 #define M_EOR 0x0004 /* end of record */
184 #define M_PROTO1 0x0008 /* protocol-specific */
185 #define M_PROTO2 0x0010 /* protocol-specific */
186 #define M_PROTO3 0x0020 /* protocol-specific */
187 #define M_PROTO4 0x0040 /* protocol-specific */
188 #define M_PROTO5 0x0080 /* protocol-specific */
191 * mbuf pkthdr flags (also stored in m_flags).
193 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
194 #define M_MCAST 0x0200 /* send/received as link-level multicast */
195 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
196 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
197 #define M_LASTFRAG 0x1000 /* packet is last fragment */
198 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
199 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
200 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
201 #define M_NOTIFICATION 0x10000 /* notification event */
204 * Flags copied when copying m_pkthdr.
206 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
207 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \
208 M_FIRSTFRAG|M_LASTFRAG)
211 * Flags indicating hw checksum support and sw checksum requirements.
213 #define CSUM_IP 0x0001 /* will csum IP */
214 #define CSUM_TCP 0x0002 /* will csum TCP */
215 #define CSUM_UDP 0x0004 /* will csum UDP */
216 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
217 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
219 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
220 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
221 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
222 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
224 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
225 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
228 * Flags indicating PF processing status
230 #define PF_MBUF_GENERATED 0x00000001
231 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */
232 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
233 #define PF_MBUF_TRANSLATE_LOCALHOST \
235 #define PF_MBUF_FRAGCACHE 0x00000010
236 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */
237 #define IPFW_MBUF_SKIP_FIREWALL 0x00000040
242 #define MT_FREE 0 /* should be on free list */
243 #define MT_DATA 1 /* dynamic (data) allocation */
244 #define MT_HEADER 2 /* packet header */
245 #define MT_SONAME 3 /* socket name */
246 #define MT_TAG 4 /* volatile metadata associated to pkts */
247 #define MT_CONTROL 5 /* extra-data protocol message */
248 #define MT_OOBDATA 6 /* expedited data */
249 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
252 * General mbuf allocator statistics structure.
255 u_long m_mbufs
; /* mbufs obtained from page pool */
256 u_long m_clusters
; /* clusters obtained from page pool */
257 u_long m_spare
; /* spare field */
258 u_long m_clfree
; /* free clusters */
259 u_long m_drops
; /* times failed to find space */
260 u_long m_wait
; /* times waited for space */
261 u_long m_drain
; /* times drained protocols for space */
262 u_long m_mcfail
; /* times m_copym failed */
263 u_long m_mpfail
; /* times m_pullup failed */
264 u_long m_msize
; /* length of an mbuf */
265 u_long m_mclbytes
; /* length of an mbuf cluster */
266 u_long m_minclsize
; /* min length of data to allocate a cluster */
267 u_long m_mlen
; /* length of data in an mbuf */
268 u_long m_mhlen
; /* length of data in a header mbuf */
272 * Flags specifying how an allocation should be made.
275 #define MB_DONTWAIT 0x4
276 #define MB_TRYWAIT 0x8
277 #define MB_WAIT MB_TRYWAIT
280 * Mbuf to Malloc Flag Conversion.
282 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
285 * These are identifying numbers passed to the m_mballoc_wait function,
286 * allowing us to determine whether the call came from an MGETHDR or
293 * mbuf allocation/deallocation macros (YYY deprecated, too big):
295 * MGET(struct mbuf *m, int how, int type)
296 * allocates an mbuf and initializes it to contain internal data.
298 * MGETHDR(struct mbuf *m, int how, int type)
299 * allocates an mbuf and initializes it to contain a packet header
302 #define MGET(m, how, type) do { \
303 (m) = m_get((how), (type)); \
306 #define MGETHDR(m, how, type) do { \
307 (m) = m_gethdr((how), (type)); \
311 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
313 * Deprecated. Use m_getcl() or m_getl() instead.
315 #define MCLGET(m, how) do { \
316 m_mclget((m), (how)); \
320 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
324 * Move mbuf pkthdr from "from" to "to".
325 * from should have M_PKTHDR set, and to must be empty.
326 * from no longer has a pkthdr after this operation.
328 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
331 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
332 * an object of the specified size at the end of the mbuf, longword aligned.
334 #define M_ALIGN(m, len) do { \
335 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
339 * As above, for mbufs allocated with m_gethdr/MGETHDR
340 * or initialized by M_COPY_PKTHDR.
342 #define MH_ALIGN(m, len) do { \
343 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
347 * Check if we can write to an mbuf.
349 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
350 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
353 * Check if the supplied mbuf has a packet header, or else panic.
355 #define M_ASSERTPKTHDR(m) \
356 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
357 ("%s: invalid mbuf or no mbuf packet header!", __func__))
360 * Compute the amount of space available before the current start of data.
361 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
362 * of checking writability of the mbuf data area rests solely with the caller.
364 #define M_LEADINGSPACE(m) \
365 ((m)->m_flags & M_EXT ? \
366 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
367 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
368 (m)->m_data - (m)->m_dat)
371 * Compute the amount of space available after the end of data in an mbuf.
372 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
373 * of checking writability of the mbuf data area rests solely with the caller.
375 #define M_TRAILINGSPACE(m) \
376 ((m)->m_flags & M_EXT ? \
377 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
378 - ((m)->m_data + (m)->m_len) : 0) : \
379 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
382 * Arrange to prepend space of size plen to mbuf m.
383 * If a new mbuf must be allocated, how specifies whether to wait.
384 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
385 * is freed and m is set to NULL.
387 #define M_PREPEND(m, plen, how) do { \
388 struct mbuf **_mmp = &(m); \
389 struct mbuf *_mm = *_mmp; \
390 int _mplen = (plen); \
391 int __mhow = (how); \
393 if (M_LEADINGSPACE(_mm) >= _mplen) { \
394 _mm->m_data -= _mplen; \
395 _mm->m_len += _mplen; \
397 _mm = m_prepend(_mm, _mplen, __mhow); \
398 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
399 _mm->m_pkthdr.len += _mplen; \
403 /* Length to m_copy to copy all. */
404 #define M_COPYALL 1000000000
406 /* Compatibility with 4.3 */
407 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
410 extern u_int m_clalloc_wid
; /* mbuf cluster wait count */
411 extern u_int m_mballoc_wid
; /* mbuf wait count */
412 extern int max_linkhdr
; /* largest link-level header */
413 extern int max_protohdr
; /* largest protocol header */
414 extern int max_hdr
; /* largest link+protocol header */
415 extern int max_datalen
; /* MHLEN - max_hdr */
416 extern struct mbstat mbstat
;
417 extern int mbuf_wait
; /* mbuf sleep time */
418 extern int nmbclusters
;
423 void m_adj(struct mbuf
*, int);
424 void m_cat(struct mbuf
*, struct mbuf
*);
425 u_int
m_countm(struct mbuf
*m
, struct mbuf
**lastm
, u_int
*mbcnt
);
426 void m_copyback(struct mbuf
*, int, int, caddr_t
);
427 void m_copydata(const struct mbuf
*, int, int, caddr_t
);
428 struct mbuf
*m_copym(const struct mbuf
*, int, int, int);
429 struct mbuf
*m_copypacket(struct mbuf
*, int);
430 struct mbuf
*m_defrag(struct mbuf
*, int);
431 struct mbuf
*m_defrag_nofree(struct mbuf
*, int);
432 struct mbuf
*m_devget(char *, int, int, struct ifnet
*,
433 void (*copy
)(volatile const void *, volatile void *, size_t));
434 struct mbuf
*m_dup(struct mbuf
*, int);
435 int m_dup_pkthdr(struct mbuf
*, const struct mbuf
*, int);
436 struct mbuf
*m_free(struct mbuf
*);
437 void m_freem(struct mbuf
*);
438 struct mbuf
*m_get(int, int);
439 struct mbuf
*m_getc(int len
, int how
, int type
);
440 struct mbuf
*m_getcl(int how
, short type
, int flags
);
441 struct mbuf
*m_getclr(int, int);
442 struct mbuf
*m_gethdr(int, int);
443 struct mbuf
*m_getm(struct mbuf
*, int, int, int);
444 struct mbuf
*m_last(struct mbuf
*m
);
445 u_int
m_lengthm(struct mbuf
*m
, struct mbuf
**lastm
);
446 void m_move_pkthdr(struct mbuf
*, struct mbuf
*);
447 struct mbuf
*m_prepend(struct mbuf
*, int, int);
448 void m_print(const struct mbuf
*m
);
449 struct mbuf
*m_pulldown(struct mbuf
*, int, int, int *);
450 struct mbuf
*m_pullup(struct mbuf
*, int);
451 struct mbuf
*m_split(struct mbuf
*, int, int);
452 struct mbuf
*m_uiomove(struct uio
*);
453 void m_mclget(struct mbuf
*m
, int how
);
454 int m_sharecount(struct mbuf
*m
);
455 void m_chtype(struct mbuf
*m
, int type
);
458 * Allocate the right type of mbuf for the desired total length.
459 * The mbuf returned does not necessarily cover the entire requested length.
460 * This function follows mbuf chaining policy of allowing MINCLSIZE
461 * amount of chained mbufs.
463 static __inline
struct mbuf
*
464 m_getl(int len
, int how
, int type
, int flags
, int *psize
)
469 if (len
>= MINCLSIZE
) {
470 m
= m_getcl(how
, type
, flags
);
472 } else if (flags
& M_PKTHDR
) {
473 m
= m_gethdr(how
, type
);
476 m
= m_get(how
, type
);
485 * Get a single mbuf that covers the requested number of bytes.
486 * This function does not create mbuf chains. It explicitly marks
487 * places in the code that abuse mbufs for contiguous data buffers.
489 static __inline
struct mbuf
*
490 m_getb(int len
, int how
, int type
, int flags
)
493 int mbufsize
= (flags
& M_PKTHDR
) ? MHLEN
: MLEN
;
496 m
= m_getcl(how
, type
, flags
);
497 else if (flags
& M_PKTHDR
)
498 m
= m_gethdr(how
, type
);
500 m
= m_get(how
, type
);
505 * Packets may have annotations attached by affixing a list
506 * of "packet tags" to the pkthdr structure. Packet tags are
507 * dynamically allocated semi-opaque data structures that have
508 * a fixed header (struct m_tag) that specifies the size of the
509 * memory block and a <cookie,type> pair that identifies it.
510 * The cookie is a 32-bit unique unsigned value used to identify
511 * a module or ABI. By convention this value is chose as the
512 * date+time that the module is created, expressed as the number of
513 * seconds since the epoch (e.g. using date -u +'%s'). The type value
514 * is an ABI/module-specific value that identifies a particular annotation
515 * and is private to the module. For compatibility with systems
516 * like openbsd that define packet tags w/o an ABI/module cookie,
517 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
518 * m_tag_find compatibility shim functions and several tag types are
519 * defined below. Users that do not require compatibility should use
520 * a private cookie value so that packet tag-related definitions
521 * can be maintained privately.
523 * Note that the packet tag returned by m_tag_allocate has the default
524 * memory alignment implemented by malloc. To reference private data
525 * one can use a construct like:
527 * struct m_tag *mtag = m_tag_allocate(...);
528 * struct foo *p = (struct foo *)(mtag+1);
530 * if the alignment of struct m_tag is sufficient for referencing members
531 * of struct foo. Otherwise it is necessary to embed struct m_tag within
532 * the private data structure to insure proper alignment; e.g.
538 * struct foo *p = (struct foo *) m_tag_allocate(...);
539 * struct m_tag *mtag = &p->tag;
542 #define PACKET_TAG_NONE 0 /* Nadda */
544 /* Packet tag for use with PACKET_ABI_COMPAT */
545 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
546 /* struct tdb_indent */
547 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
548 /* struct tdb_indent */
549 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
550 /* struct tdb_indent, never added */
551 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
552 /* struct tdb_indent, never added */
553 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
554 /* struct tdb_indent, never added */
555 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
556 /* struct ifnet *, the GIF interface */
557 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
558 /* struct ipsec_history */
559 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
561 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
565 * As a temporary and low impact solution to replace the even uglier
566 * approach used so far in some parts of the network stack (which relies
567 * on global variables), packet tag-like annotations are stored in MT_TAG
568 * mbufs (or lookalikes) prepended to the actual mbuf chain.
572 * m_next = next buffer in chain.
574 * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines.
576 #define _m_tag_id m_hdr.mh_flags
578 /* Packet tags used in the FreeBSD network stack */
579 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
580 /* struct dn_pkt as fake mbuf */
581 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
582 /* struct sockaddr_in * as m_data */
584 /* Packet tag routines */
585 struct m_tag
*m_tag_alloc(u_int32_t
, int, int, int);
586 void m_tag_free(struct m_tag
*);
587 void m_tag_prepend(struct mbuf
*, struct m_tag
*);
588 void m_tag_unlink(struct mbuf
*, struct m_tag
*);
589 void m_tag_delete(struct mbuf
*, struct m_tag
*);
590 void m_tag_delete_chain(struct mbuf
*);
591 struct m_tag
*m_tag_locate(struct mbuf
*, u_int32_t
, int, struct m_tag
*);
592 struct m_tag
*m_tag_copy(struct m_tag
*, int);
593 int m_tag_copy_chain(struct mbuf
*, const struct mbuf
*, int);
594 void m_tag_init(struct mbuf
*);
595 struct m_tag
*m_tag_first(struct mbuf
*);
596 struct m_tag
*m_tag_next(struct mbuf
*, struct m_tag
*);
598 /* these are for openbsd compatibility */
599 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
601 static __inline
void *
602 m_tag_data(struct m_tag
*tag
)
604 return ((void *)(tag
+ 1));
607 static __inline
struct m_tag
*
608 m_tag_get(int type
, int length
, int wait
)
610 return m_tag_alloc(MTAG_ABI_COMPAT
, type
, length
, wait
);
613 static __inline
struct m_tag
*
614 m_tag_find(struct mbuf
*m
, int type
, struct m_tag
*start
)
616 return m_tag_locate(m
, MTAG_ABI_COMPAT
, type
, start
);
621 #endif /* _KERNEL || _KERNEL_STRUCTURES */
622 #endif /* !_SYS_MBUF_H_ */