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.
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17 * This product includes software developed by the University of
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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 1.54 2008/10/19 08:39:55 sephe 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))
77 #define mtodoff(m, t, off) ((t)((m)->m_data + (off)))
80 * Header present at the beginning of every mbuf.
83 struct mbuf *mh_next; /* next buffer in chain */
84 struct mbuf *mh_nextpkt; /* next chain in queue/record */
85 caddr_t mh_data; /* location of data */
86 int mh_len; /* amount of data in this mbuf */
87 int mh_flags; /* flags; see below */
88 short mh_type; /* type of data in this mbuf */
89 short mh_pad; /* padding */
90 struct netmsg_packet mh_netmsg; /* hardware->proto stack msg */
95 void *hdr; /* saved hdr pos in mbuf, for ECN */
96 u_int rtableid; /* alternate routing table id */
97 u_int32_t qid; /* queue id */
98 u_int16_t tag; /* tag id */
101 uint32_t state_hash; /* identifies 'connections' */
102 uint8_t ecn_af; /* for altq_red */
109 * Packet tag structure (see below for details).
112 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
113 u_int16_t m_tag_id; /* Tag ID */
114 u_int16_t m_tag_len; /* Length of data */
115 u_int32_t m_tag_cookie; /* ABI/Module ID */
118 SLIST_HEAD(packet_tags, m_tag);
121 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
123 * Be careful: The fields have been carefully ordered to avoid hidden padding.
124 * Keep this in mind, when adding or removing fields!
127 struct ifnet *rcvif; /* rcv interface */
128 int len; /* total packet length */
129 struct packet_tags tags; /* list of packet tags */
131 /* variables for ip and tcp reassembly */
132 void *header; /* pointer to packet header */
134 /* variables for hardware checksum */
135 int csum_flags; /* flags regarding checksum */
136 int csum_data; /* data field used by csum routines */
139 uint32_t fw_flags; /* flags for PF */
141 /* variables for PF processing */
142 struct pkthdr_pf pf; /* structure for PF */
144 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */
145 uint16_t hash; /* packet hash */
147 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */
151 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
154 caddr_t ext_buf; /* start of buffer */
155 void (*ext_free)(void *);
156 u_int ext_size; /* size of buffer, for ext_free */
157 void (*ext_ref)(void *);
162 * The core of the mbuf object along with some shortcut defines for
163 * practical purposes.
169 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
171 struct m_ext MH_ext; /* M_EXT set */
172 char MH_databuf[MHLEN];
175 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
178 #define m_next m_hdr.mh_next
179 #define m_len m_hdr.mh_len
180 #define m_data m_hdr.mh_data
181 #define m_type m_hdr.mh_type
182 #define m_flags m_hdr.mh_flags
183 #define m_nextpkt m_hdr.mh_nextpkt
184 #define m_pkthdr M_dat.MH.MH_pkthdr
185 #define m_ext M_dat.MH.MH_dat.MH_ext
186 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
187 #define m_dat M_dat.M_databuf
190 * Code that uses m_act should be converted to use m_nextpkt
191 * instead; m_act is historical and deprecated.
193 #define m_act m_nextpkt
198 #define M_EXT 0x0001 /* has associated external storage */
199 #define M_PKTHDR 0x0002 /* start of record */
200 #define M_EOR 0x0004 /* end of record */
201 #define M_PROTO1 0x0008 /* protocol-specific */
202 #define M_PROTO2 0x0010 /* protocol-specific */
203 #define M_PROTO3 0x0020 /* protocol-specific */
204 #define M_PROTO4 0x0040 /* protocol-specific */
205 #define M_PROTO5 0x0080 /* protocol-specific */
208 * mbuf pkthdr flags (also stored in m_flags).
210 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
211 #define M_MCAST 0x0200 /* send/received as link-level multicast */
212 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
213 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
214 #define M_LASTFRAG 0x1000 /* packet is last fragment */
215 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
216 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
217 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
218 #define M_NOTIFICATION 0x10000 /* notification event */
219 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
220 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */
221 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */
222 #define M_HASH 0x100000/* hash field in pkthdr is valid */
223 #define M_PROTO6 0x200000/* protocol-specific */
224 #define M_PROTO7 0x400000/* protocol-specific */
225 #define M_PROTO8 0x800000/* protocol-specific */
228 * Flags copied when copying m_pkthdr.
230 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
231 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
232 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
233 M_VLANTAG|M_MPLSLABELED | \
237 * Flags indicating hw checksum support and sw checksum requirements.
239 #define CSUM_IP 0x0001 /* will csum IP */
240 #define CSUM_TCP 0x0002 /* will csum TCP */
241 #define CSUM_UDP 0x0004 /* will csum UDP */
242 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
243 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
245 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
246 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
247 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
248 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
249 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
250 * NB: This flag is only used
251 * by IP defragmenter.
254 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
255 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
258 * Flags indicating PF processing status
260 #define FW_MBUF_GENERATED 0x00000001
261 #define PF_MBUF_STRUCTURE 0x00000002 /* m_pkthdr.pf valid */
262 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
263 #define XX_MBUF_UNUSED08 0x00000008
264 #define XX_MBUF_UNUSED10 0x00000010
265 #define XX_MBUF_UNUSED20 0x00000020
266 #define IPFORWARD_MBUF_TAGGED 0x00000040
267 #define DUMMYNET_MBUF_TAGGED 0x00000080
268 #define XX_MBUF_UNUSED100 0x00000100
269 #define FW_MBUF_REDISPATCH 0x00000200
270 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
274 #define MT_FREE 0 /* should be on free list */
275 #define MT_DATA 1 /* dynamic (data) allocation */
276 #define MT_HEADER 2 /* packet header */
277 #define MT_SONAME 3 /* socket name */
279 #define MT_CONTROL 5 /* extra-data protocol message */
280 #define MT_OOBDATA 6 /* expedited data */
281 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
284 struct mbuf *mc_head;
285 struct mbuf *mc_tail;
289 * General mbuf allocator statistics structure.
292 u_long m_mbufs; /* mbufs obtained from page pool */
293 u_long m_clusters; /* clusters obtained from page pool */
294 u_long m_spare; /* spare field */
295 u_long m_clfree; /* free clusters */
296 u_long m_drops; /* times failed to find space */
297 u_long m_wait; /* times waited for space */
298 u_long m_drain; /* times drained protocols for space */
299 u_long m_mcfail; /* times m_copym failed */
300 u_long m_mpfail; /* times m_pullup failed */
301 u_long m_msize; /* length of an mbuf */
302 u_long m_mclbytes; /* length of an mbuf cluster */
303 u_long m_minclsize; /* min length of data to allocate a cluster */
304 u_long m_mlen; /* length of data in an mbuf */
305 u_long m_mhlen; /* length of data in a header mbuf */
309 * Flags specifying how an allocation should be made.
312 #define MB_DONTWAIT 0x4
313 #define MB_TRYWAIT 0x8
314 #define MB_WAIT MB_TRYWAIT
317 * Mbuf to Malloc Flag Conversion.
319 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
322 * These are identifying numbers passed to the m_mballoc_wait function,
323 * allowing us to determine whether the call came from an MGETHDR or
330 * mbuf allocation/deallocation macros (YYY deprecated, too big):
332 * MGET(struct mbuf *m, int how, int type)
333 * allocates an mbuf and initializes it to contain internal data.
335 * MGETHDR(struct mbuf *m, int how, int type)
336 * allocates an mbuf and initializes it to contain a packet header
339 #define MGET(m, how, type) do { \
340 (m) = m_get((how), (type)); \
343 #define MGETHDR(m, how, type) do { \
344 (m) = m_gethdr((how), (type)); \
348 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
350 * Deprecated. Use m_getcl() or m_getl() instead.
352 #define MCLGET(m, how) do { \
353 m_mclget((m), (how)); \
357 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
361 * Move mbuf pkthdr from "from" to "to".
362 * from should have M_PKTHDR set, and to must be empty.
363 * from no longer has a pkthdr after this operation.
365 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
368 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
369 * an object of the specified size at the end of the mbuf, longword aligned.
371 #define M_ALIGN(m, len) do { \
372 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
376 * As above, for mbufs allocated with m_gethdr/MGETHDR
377 * or initialized by M_COPY_PKTHDR.
379 #define MH_ALIGN(m, len) do { \
380 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
384 * Check if we can write to an mbuf.
386 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
387 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
390 * Check if the supplied mbuf has a packet header, or else panic.
392 #define M_ASSERTPKTHDR(m) \
393 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
394 ("%s: invalid mbuf or no mbuf packet header!", __func__))
397 * Compute the amount of space available before the current start of data.
398 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
399 * of checking writability of the mbuf data area rests solely with the caller.
401 #define M_LEADINGSPACE(m) \
402 ((m)->m_flags & M_EXT ? \
403 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
404 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
405 (m)->m_data - (m)->m_dat)
408 * Compute the amount of space available after the end of data in an mbuf.
409 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
410 * of checking writability of the mbuf data area rests solely with the caller.
412 #define M_TRAILINGSPACE(m) \
413 ((m)->m_flags & M_EXT ? \
414 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
415 - ((m)->m_data + (m)->m_len) : 0) : \
416 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
419 * Arrange to prepend space of size plen to mbuf m.
420 * If a new mbuf must be allocated, how specifies whether to wait.
421 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
422 * is freed and m is set to NULL.
424 #define M_PREPEND(m, plen, how) do { \
425 struct mbuf **_mmp = &(m); \
426 struct mbuf *_mm = *_mmp; \
427 int _mplen = (plen); \
428 int __mhow = (how); \
430 if (M_LEADINGSPACE(_mm) >= _mplen) { \
431 _mm->m_data -= _mplen; \
432 _mm->m_len += _mplen; \
434 _mm = m_prepend(_mm, _mplen, __mhow); \
435 if (_mm != NULL && (_mm->m_flags & M_PKTHDR)) \
436 _mm->m_pkthdr.len += _mplen; \
440 /* Length to m_copy to copy all. */
441 #define M_COPYALL 1000000000
443 /* Compatibility with 4.3 */
444 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
447 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
448 extern u_int m_mballoc_wid; /* mbuf wait count */
449 extern int max_linkhdr; /* largest link-level header */
450 extern int max_protohdr; /* largest protocol header */
451 extern int max_hdr; /* largest link+protocol header */
452 extern int max_datalen; /* MHLEN - max_hdr */
453 extern int mbuf_wait; /* mbuf sleep time */
454 extern int nmbclusters;
459 void m_adj(struct mbuf *, int);
460 void m_align(struct mbuf *, int);
461 int m_apply(struct mbuf *, int, int,
462 int (*)(void *, void *, u_int), void *);
463 int m_append(struct mbuf *, int, c_caddr_t);
464 void m_cat(struct mbuf *, struct mbuf *);
465 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
466 void m_copyback(struct mbuf *, int, int, caddr_t);
467 void m_copydata(const struct mbuf *, int, int, caddr_t);
468 struct mbuf *m_copym(const struct mbuf *, int, int, int);
469 struct mbuf *m_copypacket(struct mbuf *, int);
470 struct mbuf *m_defrag(struct mbuf *, int);
471 struct mbuf *m_defrag_nofree(struct mbuf *, int);
472 struct mbuf *m_devget(char *, int, int, struct ifnet *,
473 void (*copy)(volatile const void *, volatile void *, size_t));
474 struct mbuf *m_dup(struct mbuf *, int);
475 struct mbuf *m_dup_data(struct mbuf *, int);
476 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
477 struct mbuf *m_free(struct mbuf *);
478 void m_freem(struct mbuf *);
479 struct mbuf *m_get(int, int);
480 struct mbuf *m_getc(int len, int how, int type);
481 struct mbuf *m_getcl(int how, short type, int flags);
482 struct mbuf *m_getclr(int, int);
483 struct mbuf *m_gethdr(int, int);
484 struct mbuf *m_getm(struct mbuf *, int, int, int);
485 struct mbuf *m_getptr(struct mbuf *, int, int *);
486 struct mbuf *m_last(struct mbuf *m);
487 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
488 void m_move_pkthdr(struct mbuf *, struct mbuf *);
489 struct mbuf *m_prepend(struct mbuf *, int, int);
490 void m_print(const struct mbuf *m);
491 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
492 struct mbuf *m_pullup(struct mbuf *, int);
493 struct mbuf *m_split(struct mbuf *, int, int);
494 struct mbuf *m_uiomove(struct uio *);
495 void m_mclget(struct mbuf *m, int how);
496 int m_sharecount(struct mbuf *m);
497 void m_chtype(struct mbuf *m, int type);
498 int m_devpad(struct mbuf *m, int padto);
501 void mbuftrackid(struct mbuf *, int);
503 #define mbuftrackid(m, id) /* empty */
507 * Allocate the right type of mbuf for the desired total length.
508 * The mbuf returned does not necessarily cover the entire requested length.
509 * This function follows mbuf chaining policy of allowing MINCLSIZE
510 * amount of chained mbufs.
512 static __inline struct mbuf *
513 m_getl(int len, int how, int type, int flags, int *psize)
518 if (len >= MINCLSIZE) {
519 m = m_getcl(how, type, flags);
521 } else if (flags & M_PKTHDR) {
522 m = m_gethdr(how, type);
525 m = m_get(how, type);
534 * Get a single mbuf that covers the requested number of bytes.
535 * This function does not create mbuf chains. It explicitly marks
536 * places in the code that abuse mbufs for contiguous data buffers.
538 static __inline struct mbuf *
539 m_getb(int len, int how, int type, int flags)
542 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
545 m = m_getcl(how, type, flags);
546 else if (flags & M_PKTHDR)
547 m = m_gethdr(how, type);
549 m = m_get(how, type);
554 * Packets may have annotations attached by affixing a list
555 * of "packet tags" to the pkthdr structure. Packet tags are
556 * dynamically allocated semi-opaque data structures that have
557 * a fixed header (struct m_tag) that specifies the size of the
558 * memory block and a <cookie,type> pair that identifies it.
559 * The cookie is a 32-bit unique unsigned value used to identify
560 * a module or ABI. By convention this value is chose as the
561 * date+time that the module is created, expressed as the number of
562 * seconds since the epoch (e.g. using date -u +'%s'). The type value
563 * is an ABI/module-specific value that identifies a particular annotation
564 * and is private to the module. For compatibility with systems
565 * like openbsd that define packet tags w/o an ABI/module cookie,
566 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
567 * m_tag_find compatibility shim functions and several tag types are
568 * defined below. Users that do not require compatibility should use
569 * a private cookie value so that packet tag-related definitions
570 * can be maintained privately.
572 * Note that the packet tag returned by m_tag_alloc has the default
573 * memory alignment implemented by kmalloc. To reference private data
574 * one can use a construct like:
576 * struct m_tag *mtag = m_tag_alloc(...);
577 * struct foo *p = m_tag_data(mtag);
579 * if the alignment of struct m_tag is sufficient for referencing members
580 * of struct foo. Otherwise it is necessary to embed struct m_tag within
581 * the private data structure to insure proper alignment; e.g.
587 * struct foo *p = (struct foo *)m_tag_alloc(...);
588 * struct m_tag *mtag = &p->tag;
591 #define PACKET_TAG_NONE 0 /* Nadda */
593 /* Packet tag for use with PACKET_ABI_COMPAT */
594 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
595 /* struct tdb_indent */
596 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
597 /* struct tdb_indent */
598 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
599 /* struct tdb_indent, never added */
600 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
601 /* struct tdb_indent, never added */
602 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
603 /* struct tdb_indent, never added */
604 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
605 /* struct ifnet *, the GIF interface */
606 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
607 /* struct ipsec_history */
608 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
610 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
611 /* struct divert_info */
612 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
614 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
615 /* struct sockaddr_in */
616 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */
617 /* struct ip_srcrt_opt */
618 #define PACKET_TAG_CARP 28 /* CARP info */
620 #define PACKET_TAG_PF 29 /* PF info */
622 /* Packet tag routines */
623 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
624 void m_tag_free(struct m_tag *);
625 void m_tag_prepend(struct mbuf *, struct m_tag *);
626 void m_tag_unlink(struct mbuf *, struct m_tag *);
627 void m_tag_delete(struct mbuf *, struct m_tag *);
628 void m_tag_delete_chain(struct mbuf *);
629 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
630 struct m_tag *m_tag_copy(struct m_tag *, int);
631 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
632 void m_tag_init(struct mbuf *);
633 struct m_tag *m_tag_first(struct mbuf *);
634 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
636 /* these are for openbsd compatibility */
637 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
639 static __inline void *
640 m_tag_data(struct m_tag *tag)
642 return ((void *)(tag + 1));
645 static __inline struct m_tag *
646 m_tag_get(int type, int length, int wait)
648 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
651 static __inline struct m_tag *
652 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
654 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
659 #endif /* _KERNEL || _KERNEL_STRUCTURES */
660 #endif /* !_SYS_MBUF_H_ */