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 1.46 2008/03/10 10:47:57 sephe Exp $ 38 */ 39 40 #ifndef _SYS_MBUF_H_ 41 #define _SYS_MBUF_H_ 42 43 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 44 45 #ifndef _SYS_TYPES_H_ 46 #include <sys/types.h> 47 #endif 48 #ifndef _SYS_PARAM_H_ 49 #include <sys/param.h> 50 #endif 51 #ifndef _SYS_QUEUE_H_ 52 #include <sys/queue.h> 53 #endif 54 #ifndef _NET_NETISR_H_ 55 #include <net/netisr.h> 56 #endif 57 58 /* 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. 64 */ 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 */ 69 70 /* 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 75 */ 76 #define mtod(m, t) ((t)((m)->m_data)) 77 78 /* 79 * Header present at the beginning of every mbuf. 80 */ 81 struct m_hdr { 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 */ 90 }; 91 92 /* 93 * Packet tag structure (see below for details). 94 */ 95 struct m_tag { 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 */ 100 }; 101 102 SLIST_HEAD(packet_tags, m_tag); 103 104 /* 105 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 106 * 107 * Be careful: The fields have been carefully ordered to avoid hidden padding. 108 * Keep this in mind, when adding or removing fields! 109 */ 110 struct pkthdr { 111 struct ifnet *rcvif; /* rcv interface */ 112 int len; /* total packet length */ 113 struct packet_tags tags; /* list of packet tags */ 114 115 /* variables for ip and tcp reassembly */ 116 void *header; /* pointer to packet header */ 117 118 /* variables for hardware checksum */ 119 int csum_flags; /* flags regarding checksum */ 120 int csum_data; /* data field used by csum routines */ 121 122 /* firewall flags */ 123 uint32_t fw_flags; /* flags for PF */ 124 125 /* variables for PF processing */ 126 uint16_t pf_tag; /* PF tag id */ 127 uint8_t pf_routed; /* PF routing counter */ 128 129 /* variables for ALTQ processing */ 130 uint8_t ecn_af; /* address family for ECN */ 131 uint32_t altq_qid; /* queue id */ 132 133 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */ 134 uint16_t pad; /* explicit padding */ 135 }; 136 137 /* 138 * Description of external storage mapped into mbuf; valid only if M_EXT is set. 139 */ 140 struct m_ext { 141 caddr_t ext_buf; /* start of buffer */ 142 void (*ext_free)(void *); 143 u_int ext_size; /* size of buffer, for ext_free */ 144 void (*ext_ref)(void *); 145 void *ext_arg; 146 }; 147 148 /* 149 * The core of the mbuf object along with some shortcut defines for 150 * practical purposes. 151 */ 152 struct mbuf { 153 struct m_hdr m_hdr; 154 union { 155 struct { 156 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 157 union { 158 struct m_ext MH_ext; /* M_EXT set */ 159 char MH_databuf[MHLEN]; 160 } MH_dat; 161 } MH; 162 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 163 } M_dat; 164 }; 165 #define m_next m_hdr.mh_next 166 #define m_len m_hdr.mh_len 167 #define m_data m_hdr.mh_data 168 #define m_type m_hdr.mh_type 169 #define m_flags m_hdr.mh_flags 170 #define m_nextpkt m_hdr.mh_nextpkt 171 #define m_pkthdr M_dat.MH.MH_pkthdr 172 #define m_ext M_dat.MH.MH_dat.MH_ext 173 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 174 #define m_dat M_dat.M_databuf 175 176 /* 177 * Code that uses m_act should be converted to use m_nextpkt 178 * instead; m_act is historical and deprecated. 179 */ 180 #define m_act m_nextpkt 181 182 /* 183 * mbuf flags. 184 */ 185 #define M_EXT 0x0001 /* has associated external storage */ 186 #define M_PKTHDR 0x0002 /* start of record */ 187 #define M_EOR 0x0004 /* end of record */ 188 #define M_PROTO1 0x0008 /* protocol-specific */ 189 #define M_PROTO2 0x0010 /* protocol-specific */ 190 #define M_PROTO3 0x0020 /* protocol-specific */ 191 #define M_PROTO4 0x0040 /* protocol-specific */ 192 #define M_PROTO5 0x0080 /* protocol-specific */ 193 194 /* 195 * mbuf pkthdr flags (also stored in m_flags). 196 */ 197 #define M_BCAST 0x0100 /* send/received as link-level broadcast */ 198 #define M_MCAST 0x0200 /* send/received as link-level multicast */ 199 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */ 200 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */ 201 #define M_LASTFRAG 0x1000 /* packet is last fragment */ 202 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */ 203 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */ 204 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */ 205 #define M_NOTIFICATION 0x10000 /* notification event */ 206 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */ 207 208 /* 209 * Flags copied when copying m_pkthdr. 210 */ 211 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \ 212 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \ 213 M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG) 214 215 /* 216 * Flags indicating hw checksum support and sw checksum requirements. 217 */ 218 #define CSUM_IP 0x0001 /* will csum IP */ 219 #define CSUM_TCP 0x0002 /* will csum TCP */ 220 #define CSUM_UDP 0x0004 /* will csum UDP */ 221 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */ 222 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */ 223 224 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */ 225 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */ 226 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */ 227 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */ 228 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment 229 * NB: This flag is only used 230 * by IP defragmenter. 231 */ 232 233 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP) 234 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */ 235 236 /* 237 * Flags indicating PF processing status 238 */ 239 #define FW_MBUF_GENERATED 0x00000001 240 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */ 241 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */ 242 #define PF_MBUF_TRANSLATE_LOCALHOST \ 243 0x00000008 244 #define PF_MBUF_FRAGCACHE 0x00000010 245 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */ 246 #define PF_MBUF_GENERATED FW_MBUF_GENERATED 247 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED 248 #define DUMMYNET_MBUF_TAGGED 0x00000080 249 250 /* 251 * mbuf types. 252 */ 253 #define MT_FREE 0 /* should be on free list */ 254 #define MT_DATA 1 /* dynamic (data) allocation */ 255 #define MT_HEADER 2 /* packet header */ 256 #define MT_SONAME 3 /* socket name */ 257 #define MT_TAG 4 /* volatile metadata associated to pkts */ 258 #define MT_CONTROL 5 /* extra-data protocol message */ 259 #define MT_OOBDATA 6 /* expedited data */ 260 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */ 261 262 /* 263 * General mbuf allocator statistics structure. 264 */ 265 struct mbstat { 266 u_long m_mbufs; /* mbufs obtained from page pool */ 267 u_long m_clusters; /* clusters obtained from page pool */ 268 u_long m_spare; /* spare field */ 269 u_long m_clfree; /* free clusters */ 270 u_long m_drops; /* times failed to find space */ 271 u_long m_wait; /* times waited for space */ 272 u_long m_drain; /* times drained protocols for space */ 273 u_long m_mcfail; /* times m_copym failed */ 274 u_long m_mpfail; /* times m_pullup failed */ 275 u_long m_msize; /* length of an mbuf */ 276 u_long m_mclbytes; /* length of an mbuf cluster */ 277 u_long m_minclsize; /* min length of data to allocate a cluster */ 278 u_long m_mlen; /* length of data in an mbuf */ 279 u_long m_mhlen; /* length of data in a header mbuf */ 280 }; 281 282 /* 283 * Flags specifying how an allocation should be made. 284 */ 285 286 #define MB_DONTWAIT 0x4 287 #define MB_TRYWAIT 0x8 288 #define MB_WAIT MB_TRYWAIT 289 290 /* 291 * Mbuf to Malloc Flag Conversion. 292 */ 293 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT) 294 295 /* 296 * These are identifying numbers passed to the m_mballoc_wait function, 297 * allowing us to determine whether the call came from an MGETHDR or 298 * an MGET. 299 */ 300 #define MGETHDR_C 1 301 #define MGET_C 2 302 303 /* 304 * mbuf allocation/deallocation macros (YYY deprecated, too big): 305 * 306 * MGET(struct mbuf *m, int how, int type) 307 * allocates an mbuf and initializes it to contain internal data. 308 * 309 * MGETHDR(struct mbuf *m, int how, int type) 310 * allocates an mbuf and initializes it to contain a packet header 311 * and internal data. 312 */ 313 #define MGET(m, how, type) do { \ 314 (m) = m_get((how), (type)); \ 315 } while (0) 316 317 #define MGETHDR(m, how, type) do { \ 318 (m) = m_gethdr((how), (type)); \ 319 } while (0) 320 321 /* 322 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon 323 * success. 324 * Deprecated. Use m_getcl() or m_getl() instead. 325 */ 326 #define MCLGET(m, how) do { \ 327 m_mclget((m), (how)); \ 328 } while (0) 329 330 /* 331 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR 332 * or m_dup_pkthdr. 333 */ 334 /* 335 * Move mbuf pkthdr from "from" to "to". 336 * from should have M_PKTHDR set, and to must be empty. 337 * from no longer has a pkthdr after this operation. 338 */ 339 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from)) 340 341 /* 342 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place 343 * an object of the specified size at the end of the mbuf, longword aligned. 344 */ 345 #define M_ALIGN(m, len) do { \ 346 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 347 } while (0) 348 349 /* 350 * As above, for mbufs allocated with m_gethdr/MGETHDR 351 * or initialized by M_COPY_PKTHDR. 352 */ 353 #define MH_ALIGN(m, len) do { \ 354 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 355 } while (0) 356 357 /* 358 * Check if we can write to an mbuf. 359 */ 360 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1) 361 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m)) 362 363 /* 364 * Check if the supplied mbuf has a packet header, or else panic. 365 */ 366 #define M_ASSERTPKTHDR(m) \ 367 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \ 368 ("%s: invalid mbuf or no mbuf packet header!", __func__)) 369 370 /* 371 * Compute the amount of space available before the current start of data. 372 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden 373 * of checking writability of the mbuf data area rests solely with the caller. 374 */ 375 #define M_LEADINGSPACE(m) \ 376 ((m)->m_flags & M_EXT ? \ 377 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ 378 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ 379 (m)->m_data - (m)->m_dat) 380 381 /* 382 * Compute the amount of space available after the end of data in an mbuf. 383 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 384 * of checking writability of the mbuf data area rests solely with the caller. 385 */ 386 #define M_TRAILINGSPACE(m) \ 387 ((m)->m_flags & M_EXT ? \ 388 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ 389 - ((m)->m_data + (m)->m_len) : 0) : \ 390 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) 391 392 /* 393 * Arrange to prepend space of size plen to mbuf m. 394 * If a new mbuf must be allocated, how specifies whether to wait. 395 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain 396 * is freed and m is set to NULL. 397 */ 398 #define M_PREPEND(m, plen, how) do { \ 399 struct mbuf **_mmp = &(m); \ 400 struct mbuf *_mm = *_mmp; \ 401 int _mplen = (plen); \ 402 int __mhow = (how); \ 403 \ 404 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 405 _mm->m_data -= _mplen; \ 406 _mm->m_len += _mplen; \ 407 } else \ 408 _mm = m_prepend(_mm, _mplen, __mhow); \ 409 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ 410 _mm->m_pkthdr.len += _mplen; \ 411 *_mmp = _mm; \ 412 } while (0) 413 414 /* Length to m_copy to copy all. */ 415 #define M_COPYALL 1000000000 416 417 /* Compatibility with 4.3 */ 418 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT) 419 420 #ifdef _KERNEL 421 extern u_int m_clalloc_wid; /* mbuf cluster wait count */ 422 extern u_int m_mballoc_wid; /* mbuf wait count */ 423 extern int max_linkhdr; /* largest link-level header */ 424 extern int max_protohdr; /* largest protocol header */ 425 extern int max_hdr; /* largest link+protocol header */ 426 extern int max_datalen; /* MHLEN - max_hdr */ 427 extern int mbuf_wait; /* mbuf sleep time */ 428 extern int nmbclusters; 429 extern int nmbufs; 430 431 struct uio; 432 433 void m_adj(struct mbuf *, int); 434 void m_cat(struct mbuf *, struct mbuf *); 435 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt); 436 void m_copyback(struct mbuf *, int, int, caddr_t); 437 void m_copydata(const struct mbuf *, int, int, caddr_t); 438 struct mbuf *m_copym(const struct mbuf *, int, int, int); 439 struct mbuf *m_copypacket(struct mbuf *, int); 440 struct mbuf *m_defrag(struct mbuf *, int); 441 struct mbuf *m_defrag_nofree(struct mbuf *, int); 442 struct mbuf *m_devget(char *, int, int, struct ifnet *, 443 void (*copy)(volatile const void *, volatile void *, size_t)); 444 struct mbuf *m_dup(struct mbuf *, int); 445 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int); 446 struct mbuf *m_free(struct mbuf *); 447 void m_freem(struct mbuf *); 448 struct mbuf *m_get(int, int); 449 struct mbuf *m_getc(int len, int how, int type); 450 struct mbuf *m_getcl(int how, short type, int flags); 451 struct mbuf *m_getclr(int, int); 452 struct mbuf *m_gethdr(int, int); 453 struct mbuf *m_getm(struct mbuf *, int, int, int); 454 struct mbuf *m_last(struct mbuf *m); 455 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm); 456 void m_move_pkthdr(struct mbuf *, struct mbuf *); 457 struct mbuf *m_prepend(struct mbuf *, int, int); 458 void m_print(const struct mbuf *m); 459 struct mbuf *m_pulldown(struct mbuf *, int, int, int *); 460 struct mbuf *m_pullup(struct mbuf *, int); 461 struct mbuf *m_split(struct mbuf *, int, int); 462 struct mbuf *m_uiomove(struct uio *); 463 void m_mclget(struct mbuf *m, int how); 464 int m_sharecount(struct mbuf *m); 465 void m_chtype(struct mbuf *m, int type); 466 467 #ifdef MBUF_DEBUG 468 void mbuftrackid(struct mbuf *, int); 469 #else 470 #define mbuftrackid(m, id) /* empty */ 471 #endif 472 473 /* 474 * Allocate the right type of mbuf for the desired total length. 475 * The mbuf returned does not necessarily cover the entire requested length. 476 * This function follows mbuf chaining policy of allowing MINCLSIZE 477 * amount of chained mbufs. 478 */ 479 static __inline struct mbuf * 480 m_getl(int len, int how, int type, int flags, int *psize) 481 { 482 struct mbuf *m; 483 int size; 484 485 if (len >= MINCLSIZE) { 486 m = m_getcl(how, type, flags); 487 size = MCLBYTES; 488 } else if (flags & M_PKTHDR) { 489 m = m_gethdr(how, type); 490 size = MHLEN; 491 } else { 492 m = m_get(how, type); 493 size = MLEN; 494 } 495 if (psize != NULL) 496 *psize = size; 497 return (m); 498 } 499 500 /* 501 * Get a single mbuf that covers the requested number of bytes. 502 * This function does not create mbuf chains. It explicitly marks 503 * places in the code that abuse mbufs for contiguous data buffers. 504 */ 505 static __inline struct mbuf * 506 m_getb(int len, int how, int type, int flags) 507 { 508 struct mbuf *m; 509 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN; 510 511 if (len > mbufsize) 512 m = m_getcl(how, type, flags); 513 else if (flags & M_PKTHDR) 514 m = m_gethdr(how, type); 515 else 516 m = m_get(how, type); 517 return (m); 518 } 519 520 /* 521 * Packets may have annotations attached by affixing a list 522 * of "packet tags" to the pkthdr structure. Packet tags are 523 * dynamically allocated semi-opaque data structures that have 524 * a fixed header (struct m_tag) that specifies the size of the 525 * memory block and a <cookie,type> pair that identifies it. 526 * The cookie is a 32-bit unique unsigned value used to identify 527 * a module or ABI. By convention this value is chose as the 528 * date+time that the module is created, expressed as the number of 529 * seconds since the epoch (e.g. using date -u +'%s'). The type value 530 * is an ABI/module-specific value that identifies a particular annotation 531 * and is private to the module. For compatibility with systems 532 * like openbsd that define packet tags w/o an ABI/module cookie, 533 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and 534 * m_tag_find compatibility shim functions and several tag types are 535 * defined below. Users that do not require compatibility should use 536 * a private cookie value so that packet tag-related definitions 537 * can be maintained privately. 538 * 539 * Note that the packet tag returned by m_tag_alloc has the default 540 * memory alignment implemented by kmalloc. To reference private data 541 * one can use a construct like: 542 * 543 * struct m_tag *mtag = m_tag_alloc(...); 544 * struct foo *p = m_tag_data(mtag); 545 * 546 * if the alignment of struct m_tag is sufficient for referencing members 547 * of struct foo. Otherwise it is necessary to embed struct m_tag within 548 * the private data structure to insure proper alignment; e.g. 549 * 550 * struct foo { 551 * struct m_tag tag; 552 * ... 553 * }; 554 * struct foo *p = (struct foo *)m_tag_alloc(...); 555 * struct m_tag *mtag = &p->tag; 556 */ 557 558 #define PACKET_TAG_NONE 0 /* Nadda */ 559 560 /* Packet tag for use with PACKET_ABI_COMPAT */ 561 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */ 562 /* struct tdb_indent */ 563 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */ 564 /* struct tdb_indent */ 565 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */ 566 /* struct tdb_indent, never added */ 567 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */ 568 /* struct tdb_indent, never added */ 569 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */ 570 /* struct tdb_indent, never added */ 571 #define PACKET_TAG_ENCAP 6 /* Encap. processing */ 572 /* struct ifnet *, the GIF interface */ 573 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */ 574 /* struct ipsec_history */ 575 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */ 576 /* struct ip6aux */ 577 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */ 578 /* uint16_t */ 579 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */ 580 /* struct dn_pkt */ 581 #define PACKET_TAG_CARP 28 /* CARP info */ 582 583 /* 584 * As a temporary and low impact solution to replace the even uglier 585 * approach used so far in some parts of the network stack (which relies 586 * on global variables), packet tag-like annotations are stored in MT_TAG 587 * mbufs (or lookalikes) prepended to the actual mbuf chain. 588 * 589 * m_type = MT_TAG 590 * m_flags = m_tag_id 591 * m_next = next buffer in chain. 592 * 593 * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines. 594 */ 595 #define _m_tag_id m_hdr.mh_flags 596 597 /* Packet tags used in the FreeBSD network stack */ 598 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */ 599 /* struct sockaddr_in * as m_data */ 600 601 /* Packet tag routines */ 602 struct m_tag *m_tag_alloc(u_int32_t, int, int, int); 603 void m_tag_free(struct m_tag *); 604 void m_tag_prepend(struct mbuf *, struct m_tag *); 605 void m_tag_unlink(struct mbuf *, struct m_tag *); 606 void m_tag_delete(struct mbuf *, struct m_tag *); 607 void m_tag_delete_chain(struct mbuf *); 608 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *); 609 struct m_tag *m_tag_copy(struct m_tag *, int); 610 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int); 611 void m_tag_init(struct mbuf *); 612 struct m_tag *m_tag_first(struct mbuf *); 613 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *); 614 615 /* these are for openbsd compatibility */ 616 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */ 617 618 static __inline void * 619 m_tag_data(struct m_tag *tag) 620 { 621 return ((void *)(tag + 1)); 622 } 623 624 static __inline struct m_tag * 625 m_tag_get(int type, int length, int wait) 626 { 627 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait); 628 } 629 630 static __inline struct m_tag * 631 m_tag_find(struct mbuf *m, int type, struct m_tag *start) 632 { 633 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start); 634 } 635 636 #endif /* _KERNEL */ 637 638 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 639 #endif /* !_SYS_MBUF_H_ */ 640