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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8 * modification, are permitted provided that the following conditions
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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 1.44 2007/12/02 05:01:04 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))
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 int mh_flags; /* flags; see below */
87 short mh_type; /* type of data in this mbuf */
88 short mh_pad; /* padding */
89 struct netmsg_packet mh_netmsg; /* hardware->proto stack msg */
93 * Packet tag structure (see below for details).
96 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
97 u_int16_t m_tag_id; /* Tag ID */
98 u_int16_t m_tag_len; /* Length of data */
99 u_int32_t m_tag_cookie; /* ABI/Module ID */
102 SLIST_HEAD(packet_tags, m_tag);
105 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
107 * Be careful: The fields have been carefully ordered to avoid hidden padding.
108 * Keep this in mind, when adding or removing fields!
111 struct ifnet *rcvif; /* rcv interface */
112 int len; /* total packet length */
113 struct packet_tags tags; /* list of packet tags */
115 /* variables for ip and tcp reassembly */
116 void *header; /* pointer to packet header */
118 /* variables for hardware checksum */
119 int csum_flags; /* flags regarding checksum */
120 int csum_data; /* data field used by csum routines */
123 uint32_t fw_flags; /* flags for PF */
125 /* variables for PF processing */
126 uint16_t pf_tag; /* PF tag id */
127 uint8_t pf_routed; /* PF routing counter */
129 /* variables for ALTQ processing */
130 uint8_t ecn_af; /* address family for ECN */
131 uint32_t altq_qid; /* queue id */
135 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
138 caddr_t ext_buf; /* start of buffer */
139 void (*ext_free)(void *);
140 u_int ext_size; /* size of buffer, for ext_free */
141 void (*ext_ref)(void *);
146 * The core of the mbuf object along with some shortcut defines for
147 * practical purposes.
153 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
155 struct m_ext MH_ext; /* M_EXT set */
156 char MH_databuf[MHLEN];
159 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
162 #define m_next m_hdr.mh_next
163 #define m_len m_hdr.mh_len
164 #define m_data m_hdr.mh_data
165 #define m_type m_hdr.mh_type
166 #define m_flags m_hdr.mh_flags
167 #define m_nextpkt m_hdr.mh_nextpkt
168 #define m_pkthdr M_dat.MH.MH_pkthdr
169 #define m_ext M_dat.MH.MH_dat.MH_ext
170 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
171 #define m_dat M_dat.M_databuf
174 * Code that uses m_act should be converted to use m_nextpkt
175 * instead; m_act is historical and deprecated.
177 #define m_act m_nextpkt
182 #define M_EXT 0x0001 /* has associated external storage */
183 #define M_PKTHDR 0x0002 /* start of record */
184 #define M_EOR 0x0004 /* end of record */
185 #define M_PROTO1 0x0008 /* protocol-specific */
186 #define M_PROTO2 0x0010 /* protocol-specific */
187 #define M_PROTO3 0x0020 /* protocol-specific */
188 #define M_PROTO4 0x0040 /* protocol-specific */
189 #define M_PROTO5 0x0080 /* protocol-specific */
192 * mbuf pkthdr flags (also stored in m_flags).
194 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
195 #define M_MCAST 0x0200 /* send/received as link-level multicast */
196 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
197 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
198 #define M_LASTFRAG 0x1000 /* packet is last fragment */
199 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
200 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
201 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
202 #define M_NOTIFICATION 0x10000 /* notification event */
205 * Flags copied when copying m_pkthdr.
207 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
208 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \
209 M_FIRSTFRAG|M_LASTFRAG)
212 * Flags indicating hw checksum support and sw checksum requirements.
214 #define CSUM_IP 0x0001 /* will csum IP */
215 #define CSUM_TCP 0x0002 /* will csum TCP */
216 #define CSUM_UDP 0x0004 /* will csum UDP */
217 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
218 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
220 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
221 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
222 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
223 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
224 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
225 * NB: This flag is only used
226 * by IP defragmenter.
229 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
230 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
233 * Flags indicating PF processing status
235 #define PF_MBUF_GENERATED 0x00000001
236 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */
237 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
238 #define PF_MBUF_TRANSLATE_LOCALHOST \
240 #define PF_MBUF_FRAGCACHE 0x00000010
241 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */
242 #define IPFW_MBUF_SKIP_FIREWALL 0x00000040
243 #define DUMMYNET_MBUF_TAGGED 0x00000080
248 #define MT_FREE 0 /* should be on free list */
249 #define MT_DATA 1 /* dynamic (data) allocation */
250 #define MT_HEADER 2 /* packet header */
251 #define MT_SONAME 3 /* socket name */
252 #define MT_TAG 4 /* volatile metadata associated to pkts */
253 #define MT_CONTROL 5 /* extra-data protocol message */
254 #define MT_OOBDATA 6 /* expedited data */
255 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
258 * General mbuf allocator statistics structure.
261 u_long m_mbufs; /* mbufs obtained from page pool */
262 u_long m_clusters; /* clusters obtained from page pool */
263 u_long m_spare; /* spare field */
264 u_long m_clfree; /* free clusters */
265 u_long m_drops; /* times failed to find space */
266 u_long m_wait; /* times waited for space */
267 u_long m_drain; /* times drained protocols for space */
268 u_long m_mcfail; /* times m_copym failed */
269 u_long m_mpfail; /* times m_pullup failed */
270 u_long m_msize; /* length of an mbuf */
271 u_long m_mclbytes; /* length of an mbuf cluster */
272 u_long m_minclsize; /* min length of data to allocate a cluster */
273 u_long m_mlen; /* length of data in an mbuf */
274 u_long m_mhlen; /* length of data in a header mbuf */
278 * Flags specifying how an allocation should be made.
281 #define MB_DONTWAIT 0x4
282 #define MB_TRYWAIT 0x8
283 #define MB_WAIT MB_TRYWAIT
286 * Mbuf to Malloc Flag Conversion.
288 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
291 * These are identifying numbers passed to the m_mballoc_wait function,
292 * allowing us to determine whether the call came from an MGETHDR or
299 * mbuf allocation/deallocation macros (YYY deprecated, too big):
301 * MGET(struct mbuf *m, int how, int type)
302 * allocates an mbuf and initializes it to contain internal data.
304 * MGETHDR(struct mbuf *m, int how, int type)
305 * allocates an mbuf and initializes it to contain a packet header
308 #define MGET(m, how, type) do { \
309 (m) = m_get((how), (type)); \
312 #define MGETHDR(m, how, type) do { \
313 (m) = m_gethdr((how), (type)); \
317 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
319 * Deprecated. Use m_getcl() or m_getl() instead.
321 #define MCLGET(m, how) do { \
322 m_mclget((m), (how)); \
326 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
330 * Move mbuf pkthdr from "from" to "to".
331 * from should have M_PKTHDR set, and to must be empty.
332 * from no longer has a pkthdr after this operation.
334 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
337 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
338 * an object of the specified size at the end of the mbuf, longword aligned.
340 #define M_ALIGN(m, len) do { \
341 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
345 * As above, for mbufs allocated with m_gethdr/MGETHDR
346 * or initialized by M_COPY_PKTHDR.
348 #define MH_ALIGN(m, len) do { \
349 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
353 * Check if we can write to an mbuf.
355 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
356 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
359 * Check if the supplied mbuf has a packet header, or else panic.
361 #define M_ASSERTPKTHDR(m) \
362 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
363 ("%s: invalid mbuf or no mbuf packet header!", __func__))
366 * Compute the amount of space available before the current start of data.
367 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
368 * of checking writability of the mbuf data area rests solely with the caller.
370 #define M_LEADINGSPACE(m) \
371 ((m)->m_flags & M_EXT ? \
372 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
373 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
374 (m)->m_data - (m)->m_dat)
377 * Compute the amount of space available after the end of data in an mbuf.
378 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
379 * of checking writability of the mbuf data area rests solely with the caller.
381 #define M_TRAILINGSPACE(m) \
382 ((m)->m_flags & M_EXT ? \
383 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
384 - ((m)->m_data + (m)->m_len) : 0) : \
385 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
388 * Arrange to prepend space of size plen to mbuf m.
389 * If a new mbuf must be allocated, how specifies whether to wait.
390 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
391 * is freed and m is set to NULL.
393 #define M_PREPEND(m, plen, how) do { \
394 struct mbuf **_mmp = &(m); \
395 struct mbuf *_mm = *_mmp; \
396 int _mplen = (plen); \
397 int __mhow = (how); \
399 if (M_LEADINGSPACE(_mm) >= _mplen) { \
400 _mm->m_data -= _mplen; \
401 _mm->m_len += _mplen; \
403 _mm = m_prepend(_mm, _mplen, __mhow); \
404 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
405 _mm->m_pkthdr.len += _mplen; \
409 /* Length to m_copy to copy all. */
410 #define M_COPYALL 1000000000
412 /* Compatibility with 4.3 */
413 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
416 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
417 extern u_int m_mballoc_wid; /* mbuf wait count */
418 extern int max_linkhdr; /* largest link-level header */
419 extern int max_protohdr; /* largest protocol header */
420 extern int max_hdr; /* largest link+protocol header */
421 extern int max_datalen; /* MHLEN - max_hdr */
422 extern int mbuf_wait; /* mbuf sleep time */
423 extern int nmbclusters;
428 void m_adj(struct mbuf *, int);
429 void m_cat(struct mbuf *, struct mbuf *);
430 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
431 void m_copyback(struct mbuf *, int, int, caddr_t);
432 void m_copydata(const struct mbuf *, int, int, caddr_t);
433 struct mbuf *m_copym(const struct mbuf *, int, int, int);
434 struct mbuf *m_copypacket(struct mbuf *, int);
435 struct mbuf *m_defrag(struct mbuf *, int);
436 struct mbuf *m_defrag_nofree(struct mbuf *, int);
437 struct mbuf *m_devget(char *, int, int, struct ifnet *,
438 void (*copy)(volatile const void *, volatile void *, size_t));
439 struct mbuf *m_dup(struct mbuf *, int);
440 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
441 struct mbuf *m_free(struct mbuf *);
442 void m_freem(struct mbuf *);
443 struct mbuf *m_get(int, int);
444 struct mbuf *m_getc(int len, int how, int type);
445 struct mbuf *m_getcl(int how, short type, int flags);
446 struct mbuf *m_getclr(int, int);
447 struct mbuf *m_gethdr(int, int);
448 struct mbuf *m_getm(struct mbuf *, int, int, int);
449 struct mbuf *m_last(struct mbuf *m);
450 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
451 void m_move_pkthdr(struct mbuf *, struct mbuf *);
452 struct mbuf *m_prepend(struct mbuf *, int, int);
453 void m_print(const struct mbuf *m);
454 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
455 struct mbuf *m_pullup(struct mbuf *, int);
456 struct mbuf *m_split(struct mbuf *, int, int);
457 struct mbuf *m_uiomove(struct uio *);
458 void m_mclget(struct mbuf *m, int how);
459 int m_sharecount(struct mbuf *m);
460 void m_chtype(struct mbuf *m, int type);
463 void mbuftrackid(struct mbuf *, int);
465 #define mbuftrackid(m, id) /* empty */
469 * Allocate the right type of mbuf for the desired total length.
470 * The mbuf returned does not necessarily cover the entire requested length.
471 * This function follows mbuf chaining policy of allowing MINCLSIZE
472 * amount of chained mbufs.
474 static __inline struct mbuf *
475 m_getl(int len, int how, int type, int flags, int *psize)
480 if (len >= MINCLSIZE) {
481 m = m_getcl(how, type, flags);
483 } else if (flags & M_PKTHDR) {
484 m = m_gethdr(how, type);
487 m = m_get(how, type);
496 * Get a single mbuf that covers the requested number of bytes.
497 * This function does not create mbuf chains. It explicitly marks
498 * places in the code that abuse mbufs for contiguous data buffers.
500 static __inline struct mbuf *
501 m_getb(int len, int how, int type, int flags)
504 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
507 m = m_getcl(how, type, flags);
508 else if (flags & M_PKTHDR)
509 m = m_gethdr(how, type);
511 m = m_get(how, type);
516 * Packets may have annotations attached by affixing a list
517 * of "packet tags" to the pkthdr structure. Packet tags are
518 * dynamically allocated semi-opaque data structures that have
519 * a fixed header (struct m_tag) that specifies the size of the
520 * memory block and a <cookie,type> pair that identifies it.
521 * The cookie is a 32-bit unique unsigned value used to identify
522 * a module or ABI. By convention this value is chose as the
523 * date+time that the module is created, expressed as the number of
524 * seconds since the epoch (e.g. using date -u +'%s'). The type value
525 * is an ABI/module-specific value that identifies a particular annotation
526 * and is private to the module. For compatibility with systems
527 * like openbsd that define packet tags w/o an ABI/module cookie,
528 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
529 * m_tag_find compatibility shim functions and several tag types are
530 * defined below. Users that do not require compatibility should use
531 * a private cookie value so that packet tag-related definitions
532 * can be maintained privately.
534 * Note that the packet tag returned by m_tag_alloc has the default
535 * memory alignment implemented by kmalloc. To reference private data
536 * one can use a construct like:
538 * struct m_tag *mtag = m_tag_alloc(...);
539 * struct foo *p = m_tag_data(mtag);
541 * if the alignment of struct m_tag is sufficient for referencing members
542 * of struct foo. Otherwise it is necessary to embed struct m_tag within
543 * the private data structure to insure proper alignment; e.g.
549 * struct foo *p = (struct foo *)m_tag_alloc(...);
550 * struct m_tag *mtag = &p->tag;
553 #define PACKET_TAG_NONE 0 /* Nadda */
555 /* Packet tag for use with PACKET_ABI_COMPAT */
556 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
557 /* struct tdb_indent */
558 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
559 /* struct tdb_indent */
560 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
561 /* struct tdb_indent, never added */
562 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
563 /* struct tdb_indent, never added */
564 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
565 /* struct tdb_indent, never added */
566 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
567 /* struct ifnet *, the GIF interface */
568 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
569 /* struct ipsec_history */
570 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
572 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
574 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
576 #define PACKET_TAG_CARP 28 /* CARP info */
579 * As a temporary and low impact solution to replace the even uglier
580 * approach used so far in some parts of the network stack (which relies
581 * on global variables), packet tag-like annotations are stored in MT_TAG
582 * mbufs (or lookalikes) prepended to the actual mbuf chain.
586 * m_next = next buffer in chain.
588 * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines.
590 #define _m_tag_id m_hdr.mh_flags
592 /* Packet tags used in the FreeBSD network stack */
593 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
594 /* struct sockaddr_in * as m_data */
596 /* Packet tag routines */
597 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
598 void m_tag_free(struct m_tag *);
599 void m_tag_prepend(struct mbuf *, struct m_tag *);
600 void m_tag_unlink(struct mbuf *, struct m_tag *);
601 void m_tag_delete(struct mbuf *, struct m_tag *);
602 void m_tag_delete_chain(struct mbuf *);
603 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
604 struct m_tag *m_tag_copy(struct m_tag *, int);
605 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
606 void m_tag_init(struct mbuf *);
607 struct m_tag *m_tag_first(struct mbuf *);
608 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
610 /* these are for openbsd compatibility */
611 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
613 static __inline void *
614 m_tag_data(struct m_tag *tag)
616 return ((void *)(tag + 1));
619 static __inline struct m_tag *
620 m_tag_get(int type, int length, int wait)
622 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
625 static __inline struct m_tag *
626 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
628 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
633 #endif /* _KERNEL || _KERNEL_STRUCTURES */
634 #endif /* !_SYS_MBUF_H_ */