1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 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 1.31 2005/06/17 19:12:18 dillon Exp $ 38 */ 39 40 #ifndef _SYS_MBUF_H_ 41 #define _SYS_MBUF_H_ 42 43 #include <sys/queue.h> 44 45 /* 46 * Mbufs are of a single size, MSIZE (machine/param.h), which 47 * includes overhead. An mbuf may add a single "mbuf cluster" of size 48 * MCLBYTES (also in machine/param.h), which has no additional overhead 49 * and is used instead of the internal data area; this is done when 50 * at least MINCLSIZE of data must be stored. 51 */ 52 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */ 53 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */ 54 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */ 55 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */ 56 57 /* 58 * Macros for type conversion: 59 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. 60 * mtocl(x) - convert pointer within cluster to cluster index # 61 * cltom(x) - convert cluster # to ptr to beginning of cluster 62 */ 63 #define mtod(m, t) ((t)((m)->m_data)) 64 65 /* 66 * Header present at the beginning of every mbuf. 67 */ 68 struct m_hdr { 69 struct mbuf *mh_next; /* next buffer in chain */ 70 struct mbuf *mh_nextpkt; /* next chain in queue/record */ 71 caddr_t mh_data; /* location of data */ 72 int mh_len; /* amount of data in this mbuf */ 73 short mh_type; /* type of data in this mbuf */ 74 short mh_flags; /* flags; see below */ 75 }; 76 77 /* 78 * Packet tag structure (see below for details). 79 */ 80 struct m_tag { 81 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ 82 u_int16_t m_tag_id; /* Tag ID */ 83 u_int16_t m_tag_len; /* Length of data */ 84 u_int32_t m_tag_cookie; /* ABI/Module ID */ 85 }; 86 87 SLIST_HEAD(packet_tags, m_tag); 88 89 /* 90 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 91 * 92 * Be careful: The fields have been carefully ordered to avoid hidden padding. 93 * Keep this in mind, when adding or removing fields! 94 */ 95 struct pkthdr { 96 struct ifnet *rcvif; /* rcv interface */ 97 int len; /* total packet length */ 98 struct packet_tags tags; /* list of packet tags */ 99 100 /* variables for ip and tcp reassembly */ 101 void *header; /* pointer to packet header */ 102 103 /* variables for hardware checksum */ 104 int csum_flags; /* flags regarding checksum */ 105 int csum_data; /* data field used by csum routines */ 106 107 /* firewall flags */ 108 uint32_t fw_flags; /* flags for PF */ 109 110 /* variables for PF processing */ 111 uint16_t pf_tag; /* PF tag id */ 112 uint8_t pf_routed; /* PF routing counter */ 113 114 /* variables for ALTQ processing */ 115 uint8_t ecn_af; /* address family for ECN */ 116 uint32_t altq_qid; /* queue id */ 117 }; 118 119 /* 120 * Description of external storage mapped into mbuf; valid only if M_EXT is set. 121 */ 122 struct m_ext { 123 caddr_t ext_buf; /* start of buffer */ 124 void (*ext_free)(void *); 125 u_int ext_size; /* size of buffer, for ext_free */ 126 void (*ext_ref)(void *); 127 void *ext_arg; 128 }; 129 130 /* 131 * The core of the mbuf object along with some shortcut defines for 132 * practical purposes. 133 */ 134 struct mbuf { 135 struct m_hdr m_hdr; 136 union { 137 struct { 138 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 139 union { 140 struct m_ext MH_ext; /* M_EXT set */ 141 char MH_databuf[MHLEN]; 142 } MH_dat; 143 } MH; 144 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 145 } M_dat; 146 }; 147 #define m_next m_hdr.mh_next 148 #define m_len m_hdr.mh_len 149 #define m_data m_hdr.mh_data 150 #define m_type m_hdr.mh_type 151 #define m_flags m_hdr.mh_flags 152 #define m_nextpkt m_hdr.mh_nextpkt 153 #define m_pkthdr M_dat.MH.MH_pkthdr 154 #define m_ext M_dat.MH.MH_dat.MH_ext 155 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 156 #define m_dat M_dat.M_databuf 157 158 /* 159 * Code that uses m_act should be converted to use m_nextpkt 160 * instead; m_act is historical and deprecated. 161 */ 162 #define m_act m_nextpkt 163 164 /* 165 * mbuf flags. 166 */ 167 #define M_EXT 0x0001 /* has associated external storage */ 168 #define M_PKTHDR 0x0002 /* start of record */ 169 #define M_EOR 0x0004 /* end of record */ 170 #define M_PROTO1 0x0008 /* protocol-specific */ 171 #define M_PROTO2 0x0010 /* protocol-specific */ 172 #define M_PROTO3 0x0020 /* protocol-specific */ 173 #define M_PROTO4 0x0040 /* protocol-specific */ 174 #define M_PROTO5 0x0080 /* protocol-specific */ 175 176 /* 177 * mbuf pkthdr flags (also stored in m_flags). 178 */ 179 #define M_BCAST 0x0100 /* send/received as link-level broadcast */ 180 #define M_MCAST 0x0200 /* send/received as link-level multicast */ 181 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */ 182 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */ 183 #define M_LASTFRAG 0x1000 /* packet is last fragment */ 184 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */ 185 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */ 186 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */ 187 188 /* 189 * Flags copied when copying m_pkthdr. 190 */ 191 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \ 192 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \ 193 M_FIRSTFRAG|M_LASTFRAG) 194 195 /* 196 * Flags indicating hw checksum support and sw checksum requirements. 197 */ 198 #define CSUM_IP 0x0001 /* will csum IP */ 199 #define CSUM_TCP 0x0002 /* will csum TCP */ 200 #define CSUM_UDP 0x0004 /* will csum UDP */ 201 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */ 202 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */ 203 204 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */ 205 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */ 206 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */ 207 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */ 208 209 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP) 210 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */ 211 212 /* 213 * Flags indicating PF processing status 214 */ 215 #define PF_MBUF_GENERATED 0x00000001 216 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */ 217 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */ 218 #define PF_MBUF_TRANSLATE_LOCALHOST \ 219 0x00000008 220 #define PF_MBUF_FRAGCACHE 0x00000010 221 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */ 222 223 /* 224 * mbuf types. 225 */ 226 #define MT_FREE 0 /* should be on free list */ 227 #define MT_DATA 1 /* dynamic (data) allocation */ 228 #define MT_HEADER 2 /* packet header */ 229 #define MT_SONAME 3 /* socket name */ 230 #define MT_TAG 4 /* volatile metadata associated to pkts */ 231 #define MT_CONTROL 5 /* extra-data protocol message */ 232 #define MT_OOBDATA 6 /* expedited data */ 233 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */ 234 235 /* 236 * General mbuf allocator statistics structure. 237 */ 238 struct mbstat { 239 u_long m_mbufs; /* mbufs obtained from page pool */ 240 u_long m_clusters; /* clusters obtained from page pool */ 241 u_long m_spare; /* spare field */ 242 u_long m_clfree; /* free clusters */ 243 u_long m_drops; /* times failed to find space */ 244 u_long m_wait; /* times waited for space */ 245 u_long m_drain; /* times drained protocols for space */ 246 u_long m_mcfail; /* times m_copym failed */ 247 u_long m_mpfail; /* times m_pullup failed */ 248 u_long m_msize; /* length of an mbuf */ 249 u_long m_mclbytes; /* length of an mbuf cluster */ 250 u_long m_minclsize; /* min length of data to allocate a cluster */ 251 u_long m_mlen; /* length of data in an mbuf */ 252 u_long m_mhlen; /* length of data in a header mbuf */ 253 }; 254 255 /* 256 * Flags specifying how an allocation should be made. 257 */ 258 259 #define MB_DONTWAIT 0x4 260 #define MB_TRYWAIT 0x8 261 #define MB_WAIT MB_TRYWAIT 262 263 /* 264 * Mbuf to Malloc Flag Conversion. 265 */ 266 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT) 267 268 /* 269 * These are identifying numbers passed to the m_mballoc_wait function, 270 * allowing us to determine whether the call came from an MGETHDR or 271 * an MGET. 272 */ 273 #define MGETHDR_C 1 274 #define MGET_C 2 275 276 /* 277 * mbuf allocation/deallocation macros (YYY deprecated, too big): 278 * 279 * MGET(struct mbuf *m, int how, int type) 280 * allocates an mbuf and initializes it to contain internal data. 281 * 282 * MGETHDR(struct mbuf *m, int how, int type) 283 * allocates an mbuf and initializes it to contain a packet header 284 * and internal data. 285 */ 286 #define MGET(m, how, type) do { \ 287 (m) = m_get((how), (type)); \ 288 } while (0) 289 290 #define MGETHDR(m, how, type) do { \ 291 (m) = m_gethdr((how), (type)); \ 292 } while (0) 293 294 /* 295 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon 296 * success. 297 * Deprecated. Use m_getcl() or m_getl() instead. 298 */ 299 #define MCLGET(m, how) do { \ 300 m_mclget((m), (how)); \ 301 } while (0) 302 303 /* 304 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR 305 * or m_dup_pkthdr. 306 */ 307 /* 308 * Move mbuf pkthdr from "from" to "to". 309 * from should have M_PKTHDR set, and to must be empty. 310 * from no longer has a pkthdr after this operation. 311 */ 312 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from)) 313 314 /* 315 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place 316 * an object of the specified size at the end of the mbuf, longword aligned. 317 */ 318 #define M_ALIGN(m, len) do { \ 319 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 320 } while (0) 321 322 /* 323 * As above, for mbufs allocated with m_gethdr/MGETHDR 324 * or initialized by M_COPY_PKTHDR. 325 */ 326 #define MH_ALIGN(m, len) do { \ 327 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 328 } while (0) 329 330 /* 331 * Check if we can write to an mbuf. 332 */ 333 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1) 334 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m)) 335 336 /* 337 * Check if the supplied mbuf has a packet header, or else panic. 338 */ 339 #define M_ASSERTPKTHDR(m) \ 340 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \ 341 ("%s: invalid mbuf or no mbuf packet header!", __func__)) 342 343 /* 344 * Compute the amount of space available before the current start of data. 345 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden 346 * of checking writability of the mbuf data area rests solely with the caller. 347 */ 348 #define M_LEADINGSPACE(m) \ 349 ((m)->m_flags & M_EXT ? \ 350 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ 351 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ 352 (m)->m_data - (m)->m_dat) 353 354 /* 355 * Compute the amount of space available after the end of data in an mbuf. 356 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 357 * of checking writability of the mbuf data area rests solely with the caller. 358 */ 359 #define M_TRAILINGSPACE(m) \ 360 ((m)->m_flags & M_EXT ? \ 361 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ 362 - ((m)->m_data + (m)->m_len) : 0) : \ 363 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) 364 365 /* 366 * Arrange to prepend space of size plen to mbuf m. 367 * If a new mbuf must be allocated, how specifies whether to wait. 368 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain 369 * is freed and m is set to NULL. 370 */ 371 #define M_PREPEND(m, plen, how) do { \ 372 struct mbuf **_mmp = &(m); \ 373 struct mbuf *_mm = *_mmp; \ 374 int _mplen = (plen); \ 375 int __mhow = (how); \ 376 \ 377 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 378 _mm->m_data -= _mplen; \ 379 _mm->m_len += _mplen; \ 380 } else \ 381 _mm = m_prepend(_mm, _mplen, __mhow); \ 382 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ 383 _mm->m_pkthdr.len += _mplen; \ 384 *_mmp = _mm; \ 385 } while (0) 386 387 /* Length to m_copy to copy all. */ 388 #define M_COPYALL 1000000000 389 390 /* Compatibility with 4.3 */ 391 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT) 392 393 #ifdef _KERNEL 394 extern u_int m_clalloc_wid; /* mbuf cluster wait count */ 395 extern u_int m_mballoc_wid; /* mbuf wait count */ 396 extern int max_linkhdr; /* largest link-level header */ 397 extern int max_protohdr; /* largest protocol header */ 398 extern int max_hdr; /* largest link+protocol header */ 399 extern int max_datalen; /* MHLEN - max_hdr */ 400 extern struct mbstat mbstat; 401 extern int mbuf_wait; /* mbuf sleep time */ 402 extern int nmbclusters; 403 extern int nmbufs; 404 405 struct uio; 406 407 void m_adj(struct mbuf *, int); 408 void m_cat(struct mbuf *, struct mbuf *); 409 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt); 410 void m_copyback(struct mbuf *, int, int, caddr_t); 411 void m_copydata(const struct mbuf *, int, int, caddr_t); 412 struct mbuf *m_copym(const struct mbuf *, int, int, int); 413 struct mbuf *m_copypacket(struct mbuf *, int); 414 struct mbuf *m_defrag(struct mbuf *, int); 415 struct mbuf *m_defrag_nofree(struct mbuf *, int); 416 struct mbuf *m_devget(char *, int, int, struct ifnet *, 417 void (*copy)(volatile const void *, volatile void *, size_t)); 418 struct mbuf *m_dup(struct mbuf *, int); 419 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int); 420 struct mbuf *m_free(struct mbuf *); 421 void m_freem(struct mbuf *); 422 struct mbuf *m_get(int, int); 423 struct mbuf *m_getc(int len, int how, int type); 424 struct mbuf *m_getcl(int how, short type, int flags); 425 struct mbuf *m_getclr(int, int); 426 struct mbuf *m_gethdr(int, int); 427 struct mbuf *m_getm(struct mbuf *, int, int, int); 428 struct mbuf *m_last(struct mbuf *m); 429 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm); 430 void m_move_pkthdr(struct mbuf *, struct mbuf *); 431 struct mbuf *m_prepend(struct mbuf *, int, int); 432 void m_print(const struct mbuf *m); 433 struct mbuf *m_pulldown(struct mbuf *, int, int, int *); 434 struct mbuf *m_pullup(struct mbuf *, int); 435 struct mbuf *m_split(struct mbuf *, int, int); 436 struct mbuf *m_uiomove(struct uio *); 437 void m_mclget(struct mbuf *m, int how); 438 int m_sharecount(struct mbuf *m); 439 void m_chtype(struct mbuf *m, int type); 440 441 /* 442 * Allocate the right type of mbuf for the desired total length. 443 */ 444 static __inline struct mbuf * 445 m_getl(int len, int how, int type, int flags, int *psize) 446 { 447 struct mbuf *m; 448 int size; 449 450 if (len >= MINCLSIZE) { 451 m = m_getcl(how, type, flags); 452 size = MCLBYTES; 453 } else if (flags & M_PKTHDR) { 454 m = m_gethdr(how, type); 455 size = MHLEN; 456 } else { 457 m = m_get(how, type); 458 size = MLEN; 459 } 460 if (psize != NULL) 461 *psize = size; 462 return (m); 463 } 464 465 /* 466 * Packets may have annotations attached by affixing a list 467 * of "packet tags" to the pkthdr structure. Packet tags are 468 * dynamically allocated semi-opaque data structures that have 469 * a fixed header (struct m_tag) that specifies the size of the 470 * memory block and a <cookie,type> pair that identifies it. 471 * The cookie is a 32-bit unique unsigned value used to identify 472 * a module or ABI. By convention this value is chose as the 473 * date+time that the module is created, expressed as the number of 474 * seconds since the epoch (e.g. using date -u +'%s'). The type value 475 * is an ABI/module-specific value that identifies a particular annotation 476 * and is private to the module. For compatibility with systems 477 * like openbsd that define packet tags w/o an ABI/module cookie, 478 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and 479 * m_tag_find compatibility shim functions and several tag types are 480 * defined below. Users that do not require compatibility should use 481 * a private cookie value so that packet tag-related definitions 482 * can be maintained privately. 483 * 484 * Note that the packet tag returned by m_tag_allocate has the default 485 * memory alignment implemented by malloc. To reference private data 486 * one can use a construct like: 487 * 488 * struct m_tag *mtag = m_tag_allocate(...); 489 * struct foo *p = (struct foo *)(mtag+1); 490 * 491 * if the alignment of struct m_tag is sufficient for referencing members 492 * of struct foo. Otherwise it is necessary to embed struct m_tag within 493 * the private data structure to insure proper alignment; e.g. 494 * 495 * struct foo { 496 * struct m_tag tag; 497 * ... 498 * }; 499 * struct foo *p = (struct foo *) m_tag_allocate(...); 500 * struct m_tag *mtag = &p->tag; 501 */ 502 503 #define PACKET_TAG_NONE 0 /* Nadda */ 504 505 /* Packet tag for use with PACKET_ABI_COMPAT */ 506 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */ 507 /* struct tdb_indent */ 508 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */ 509 /* struct tdb_indent */ 510 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */ 511 /* struct tdb_indent, never added */ 512 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */ 513 /* struct tdb_indent, never added */ 514 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */ 515 /* struct tdb_indent, never added */ 516 #define PACKET_TAG_ENCAP 6 /* Encap. processing */ 517 /* struct ifnet *, the GIF interface */ 518 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */ 519 /* struct ipsec_history */ 520 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */ 521 /* struct ip6aux */ 522 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */ 523 /* uint16_t */ 524 525 /* 526 * As a temporary and low impact solution to replace the even uglier 527 * approach used so far in some parts of the network stack (which relies 528 * on global variables), packet tag-like annotations are stored in MT_TAG 529 * mbufs (or lookalikes) prepended to the actual mbuf chain. 530 * 531 * m_type = MT_TAG 532 * m_flags = m_tag_id 533 * m_next = next buffer in chain. 534 * 535 * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines. 536 */ 537 #define _m_tag_id m_hdr.mh_flags 538 539 /* Packet tags used in the FreeBSD network stack */ 540 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */ 541 /* struct dn_pkt as fake mbuf */ 542 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */ 543 /* struct sockaddr_in * as m_data */ 544 545 /* Packet tag routines */ 546 struct m_tag *m_tag_alloc(u_int32_t, int, int, int); 547 void m_tag_free(struct m_tag *); 548 void m_tag_prepend(struct mbuf *, struct m_tag *); 549 void m_tag_unlink(struct mbuf *, struct m_tag *); 550 void m_tag_delete(struct mbuf *, struct m_tag *); 551 void m_tag_delete_chain(struct mbuf *); 552 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *); 553 struct m_tag *m_tag_copy(struct m_tag *, int); 554 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int); 555 void m_tag_init(struct mbuf *); 556 struct m_tag *m_tag_first(struct mbuf *); 557 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *); 558 559 /* these are for openbsd compatibility */ 560 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */ 561 562 static __inline void * 563 m_tag_data(struct m_tag *tag) 564 { 565 return ((void *)(tag + 1)); 566 } 567 568 static __inline struct m_tag * 569 m_tag_get(int type, int length, int wait) 570 { 571 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait); 572 } 573 574 static __inline struct m_tag * 575 m_tag_find(struct mbuf *m, int type, struct m_tag *start) 576 { 577 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start); 578 } 579 #endif /* _KERNEL */ 580 581 #endif /* !_SYS_MBUF_H_ */ 582