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 1.54 2008/10/19 08:39:55 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 #ifndef _NET_ETHERNET_H_ 58 #include <net/ethernet.h> 59 #endif 60 61 /* 62 * Mbufs are of a single size, MSIZE (machine/param.h), which 63 * includes overhead. An mbuf may add a single "mbuf cluster" of size 64 * MCLBYTES (also in machine/param.h), which has no additional overhead 65 * and is used instead of the internal data area; this is done when 66 * at least MINCLSIZE of data must be stored. 67 */ 68 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */ 69 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */ 70 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */ 71 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */ 72 73 /* 74 * Macros for type conversion: 75 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. 76 * mtodoff(m, t, off) -- Convert mbuf pointer at the specified offset to data 77 * pointer of correct type. 78 */ 79 #define mtod(m, t) ((t)((m)->m_data)) 80 #define mtodoff(m, t, off) ((t)((m)->m_data + (off))) 81 82 /* 83 * Header present at the beginning of every mbuf. 84 */ 85 struct m_hdr { 86 struct mbuf *mh_next; /* next buffer in chain */ 87 struct mbuf *mh_nextpkt; /* next chain in queue/record */ 88 caddr_t mh_data; /* location of data */ 89 int mh_len; /* amount of data in this mbuf */ 90 int mh_flags; /* flags; see below */ 91 short mh_type; /* type of data in this mbuf */ 92 short mh_pad; /* padding */ 93 /* XXX implicit 4 bytes padding on x86_64 */ 94 #ifdef MBUF_DEBUG 95 const char *mh_lastfunc; 96 #endif 97 union { 98 struct netmsg_packet mhm_pkt; /* hardware->proto stack msg */ 99 struct netmsg_pru_send mhm_snd; /* usrspace->proto stack msg */ 100 struct netmsg_inarp mhm_arp; /* proto stack<->route msg */ 101 } mh_msgu; 102 }; 103 #define mh_netmsg mh_msgu.mhm_pkt 104 #define mh_sndmsg mh_msgu.mhm_snd 105 #define mh_arpmsg mh_msgu.mhm_arp 106 107 /* pf stuff */ 108 struct pkthdr_pf { 109 void *hdr; /* saved hdr pos in mbuf, for ECN */ 110 void *statekey; /* pf stackside statekey */ 111 u_int rtableid; /* alternate routing table id */ 112 uint32_t qid; /* queue id */ 113 uint16_t tag; /* tag id */ 114 uint8_t flags; 115 uint8_t routed; 116 uint32_t state_hash; /* identifies 'connections' */ 117 uint8_t ecn_af; /* for altq_red */ 118 uint8_t unused01; 119 uint8_t unused02; 120 uint8_t unused03; 121 /* XXX implicit 4 bytes padding on x86_64 */ 122 }; 123 124 /* pkthdr_pf.flags */ 125 #define PF_TAG_GENERATED 0x01 126 #define PF_TAG_FRAGCACHE 0x02 127 #define PF_TAG_TRANSLATE_LOCALHOST 0x04 128 #define PF_TAG_DIVERTED 0x08 129 #define PF_TAG_DIVERTED_PACKET 0x10 130 #define PF_TAG_REROUTE 0x20 131 132 /* 133 * Packet tag structure (see below for details). 134 */ 135 struct m_tag { 136 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ 137 uint16_t m_tag_id; /* Tag ID */ 138 uint16_t m_tag_len; /* Length of data */ 139 uint32_t m_tag_cookie; /* ABI/Module ID */ 140 }; 141 142 SLIST_HEAD(packet_tags, m_tag); 143 144 /* 145 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 146 * 147 * Be careful: The fields have been carefully ordered to avoid hidden padding. 148 * Keep this in mind, when adding or removing fields! 149 */ 150 struct pkthdr { 151 struct ifnet *rcvif; /* rcv interface */ 152 struct packet_tags tags; /* list of packet tags */ 153 154 /* variables for ip and tcp reassembly */ 155 void *header; /* pointer to packet header */ 156 int len; /* total packet length */ 157 158 /* variables for hardware checksum */ 159 int csum_flags; /* flags regarding checksum */ 160 int csum_data; /* data field used by csum routines */ 161 uint16_t csum_iphlen; /* IP header length */ 162 /* valid if CSUM IP|UDP|TCP|TSO */ 163 uint8_t csum_thlen; /* TCP/UDP header length */ 164 /* valid if CSUM UDP|TCP|TSO */ 165 uint8_t csum_lhlen; /* link header length */ 166 167 uint16_t tso_segsz; /* TSO segment size */ 168 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */ 169 170 uint16_t hash; /* packet hash */ 171 uint16_t unused1; /* reserved for route table id */ 172 uint32_t unused2; /* reserved for codel timestamp */ 173 174 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */ 175 /* 176 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records 177 * the original ether source address (if compatible). 178 */ 179 uint8_t ether_br_shost[ETHER_ADDR_LEN]; 180 181 /* firewall flags */ 182 uint32_t fw_flags; /* flags for FW */ 183 184 /* variables for PF processing */ 185 struct pkthdr_pf pf; /* structure for PF */ 186 }; 187 188 /* 189 * Description of external storage mapped into mbuf; valid only if M_EXT is set. 190 */ 191 struct m_ext { 192 caddr_t ext_buf; /* start of buffer */ 193 void (*ext_free)(void *); 194 u_int ext_size; /* size of buffer, for ext_free */ 195 void (*ext_ref)(void *); 196 void *ext_arg; 197 }; 198 199 /* 200 * The core of the mbuf object along with some shortcut defines for 201 * practical purposes. 202 */ 203 struct mbuf { 204 struct m_hdr m_hdr; 205 union { 206 struct { 207 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 208 union { 209 struct m_ext MH_ext; /* M_EXT set */ 210 char MH_databuf[MHLEN]; 211 } MH_dat; 212 } MH; 213 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 214 } M_dat; 215 }; 216 #define m_next m_hdr.mh_next 217 #define m_len m_hdr.mh_len 218 #define m_data m_hdr.mh_data 219 #define m_type m_hdr.mh_type 220 #define m_flags m_hdr.mh_flags 221 #define m_nextpkt m_hdr.mh_nextpkt 222 #define m_pkthdr M_dat.MH.MH_pkthdr 223 #define m_ext M_dat.MH.MH_dat.MH_ext 224 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 225 #define m_dat M_dat.M_databuf 226 227 /* 228 * Code that uses m_act should be converted to use m_nextpkt 229 * instead; m_act is historical and deprecated. 230 */ 231 #define m_act m_nextpkt 232 233 /* 234 * mbuf flags. 235 */ 236 #define M_EXT 0x0001 /* has associated external storage */ 237 #define M_PKTHDR 0x0002 /* start of record */ 238 #define M_EOR 0x0004 /* end of record */ 239 #define M_PROTO1 0x0008 /* protocol-specific */ 240 #define M_PROTO2 0x0010 /* protocol-specific */ 241 #define M_PROTO3 0x0020 /* protocol-specific */ 242 #define M_PROTO4 0x0040 /* protocol-specific */ 243 #define M_PROTO5 0x0080 /* protocol-specific */ 244 245 /* 246 * mbuf pkthdr flags (also stored in m_flags). 247 */ 248 #define M_BCAST 0x0100 /* send/received as link-level broadcast */ 249 #define M_MCAST 0x0200 /* send/received as link-level multicast */ 250 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */ 251 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */ 252 #define M_LASTFRAG 0x1000 /* packet is last fragment */ 253 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */ 254 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */ 255 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */ 256 #define M_NOTIFICATION 0x10000 /* notification event */ 257 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */ 258 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */ 259 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */ 260 #define M_HASH 0x100000/* hash field in pkthdr is valid */ 261 #define M_PROTO6 0x200000/* protocol-specific */ 262 #define M_PROTO7 0x400000/* protocol-specific */ 263 #define M_PROTO8 0x800000/* protocol-specific */ 264 #define M_CKHASH 0x1000000/* hash needs software verification */ 265 #define M_PRIO 0x2000000/* high priority mbuf */ 266 267 /* 268 * Flags copied when copying m_pkthdr. 269 */ 270 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \ 271 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \ 272 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \ 273 M_VLANTAG|M_MPLSLABELED | \ 274 M_LENCHECKED|M_HASH|M_CKHASH|M_PRIO) 275 276 /* 277 * Flags indicating hw checksum support and sw checksum requirements. 278 */ 279 #define CSUM_IP 0x0001 /* will csum IP */ 280 #define CSUM_TCP 0x0002 /* will csum TCP */ 281 #define CSUM_UDP 0x0004 /* will csum UDP */ 282 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */ 283 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */ 284 285 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */ 286 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */ 287 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */ 288 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */ 289 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment 290 * NB: This flag is only used 291 * by IP defragmenter. 292 */ 293 #define CSUM_TSO 0x2000 /* will do TCP segmentation */ 294 295 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP) 296 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */ 297 298 /* 299 * Flags indicating PF processing status 300 */ 301 #define FW_MBUF_GENERATED 0x00000001 302 #define PF_MBUF_STRUCTURE 0x00000002 /* m_pkthdr.pf valid */ 303 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */ 304 #define PF_MBUF_TAGGED 0x00000008 305 #define XX_MBUF_UNUSED10 0x00000010 306 #define XX_MBUF_UNUSED20 0x00000020 307 #define IPFORWARD_MBUF_TAGGED 0x00000040 308 #define DUMMYNET_MBUF_TAGGED 0x00000080 309 #define BRIDGE_MBUF_TAGGED 0x00000100 310 #define FW_MBUF_REDISPATCH 0x00000200 311 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED 312 /* 313 * mbuf types. 314 */ 315 #define MT_FREE 0 /* should be on free list */ 316 #define MT_DATA 1 /* dynamic (data) allocation */ 317 #define MT_HEADER 2 /* packet header */ 318 #define MT_SONAME 3 /* socket name */ 319 /* 4 was MT_TAG */ 320 #define MT_CONTROL 5 /* extra-data protocol message */ 321 #define MT_OOBDATA 6 /* expedited data */ 322 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */ 323 324 /* 325 * General mbuf allocator statistics structure. 326 * 327 * NOTE: Make sure this struct's size is multiple cache line size. 328 */ 329 struct mbstat { 330 u_long m_mbufs; /* mbufs obtained from page pool */ 331 u_long m_clusters; /* clusters obtained from page pool */ 332 u_long m_jclusters; /* jclusters obtained from page pool */ 333 u_long m_clfree; /* free clusters */ 334 u_long m_drops; /* times failed to find space */ 335 u_long m_wait; /* times waited for space */ 336 u_long m_drain; /* times drained protocols for space */ 337 u_long m_mcfail; /* times m_copym failed */ 338 u_long m_mpfail; /* times m_pullup failed */ 339 u_long m_msize; /* length of an mbuf */ 340 u_long m_mclbytes; /* length of an mbuf cluster */ 341 u_long m_mjumpagesize; /* length of a jumbo mbuf cluster */ 342 u_long m_minclsize; /* min length of data to allocate a cluster */ 343 u_long m_mlen; /* length of data in an mbuf */ 344 u_long m_mhlen; /* length of data in a header mbuf */ 345 u_long m_pad; /* pad to cache line size (64B) */ 346 }; 347 348 /* 349 * Flags specifying how an allocation should be made. 350 */ 351 352 #define MB_DONTWAIT 0x4 353 #define MB_TRYWAIT 0x8 354 #define MB_WAIT MB_TRYWAIT 355 356 /* 357 * Mbuf to Malloc Flag Conversion. 358 */ 359 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT) 360 361 /* 362 * These are identifying numbers passed to the m_mballoc_wait function, 363 * allowing us to determine whether the call came from an MGETHDR or 364 * an MGET. 365 */ 366 #define MGETHDR_C 1 367 #define MGET_C 2 368 369 /* 370 * mbuf allocation/deallocation macros (YYY deprecated, too big): 371 * 372 * MGET(struct mbuf *m, int how, int type) 373 * allocates an mbuf and initializes it to contain internal data. 374 * 375 * MGETHDR(struct mbuf *m, int how, int type) 376 * allocates an mbuf and initializes it to contain a packet header 377 * and internal data. 378 */ 379 #define MGET(m, how, type) do { \ 380 (m) = m_get((how), (type)); \ 381 } while (0) 382 383 #define MGETHDR(m, how, type) do { \ 384 (m) = m_gethdr((how), (type)); \ 385 } while (0) 386 387 /* 388 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon 389 * success. 390 * Deprecated. Use m_getcl() or m_getl() instead. 391 */ 392 #define MCLGET(m, how) do { \ 393 m_mclget((m), (how)); \ 394 } while (0) 395 396 /* 397 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR 398 * or m_dup_pkthdr. 399 */ 400 /* 401 * Move mbuf pkthdr from "from" to "to". 402 * from should have M_PKTHDR set, and to must be empty. 403 * from no longer has a pkthdr after this operation. 404 */ 405 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from)) 406 407 /* 408 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place 409 * an object of the specified size at the end of the mbuf, longword aligned. 410 */ 411 #define M_ALIGN(m, len) do { \ 412 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 413 } while (0) 414 415 /* 416 * As above, for mbufs allocated with m_gethdr/MGETHDR 417 * or initialized by M_COPY_PKTHDR. 418 */ 419 #define MH_ALIGN(m, len) do { \ 420 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 421 } while (0) 422 423 /* 424 * Check if we can write to an mbuf. 425 */ 426 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1) 427 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m)) 428 429 /* 430 * Check if the supplied mbuf has a packet header, or else panic. 431 */ 432 #define M_ASSERTPKTHDR(m) \ 433 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \ 434 ("%s: invalid mbuf or no mbuf packet header!", __func__)) 435 436 /* 437 * Compute the amount of space available before the current start of data. 438 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden 439 * of checking writability of the mbuf data area rests solely with the caller. 440 */ 441 #define M_LEADINGSPACE(m) \ 442 ((m)->m_flags & M_EXT ? \ 443 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ 444 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ 445 (m)->m_data - (m)->m_dat) 446 447 /* 448 * Compute the amount of space available after the end of data in an mbuf. 449 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 450 * of checking writability of the mbuf data area rests solely with the caller. 451 */ 452 #define M_TRAILINGSPACE(m) \ 453 ((m)->m_flags & M_EXT ? \ 454 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ 455 - ((m)->m_data + (m)->m_len) : 0) : \ 456 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) 457 458 /* 459 * Arrange to prepend space of size plen to mbuf m. 460 * If a new mbuf must be allocated, how specifies whether to wait. 461 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain 462 * is freed and m is set to NULL. 463 */ 464 #define M_PREPEND(m, plen, how) do { \ 465 struct mbuf **_mmp = &(m); \ 466 struct mbuf *_mm = *_mmp; \ 467 int _mplen = (plen); \ 468 int __mhow = (how); \ 469 \ 470 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 471 _mm->m_data -= _mplen; \ 472 _mm->m_len += _mplen; \ 473 } else \ 474 _mm = m_prepend(_mm, _mplen, __mhow); \ 475 if (_mm != NULL && (_mm->m_flags & M_PKTHDR)) \ 476 _mm->m_pkthdr.len += _mplen; \ 477 *_mmp = _mm; \ 478 } while (0) 479 480 /* Length to m_copy to copy all. */ 481 #define M_COPYALL 1000000000 482 483 /* Compatibility with 4.3 */ 484 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT) 485 486 #ifdef _KERNEL 487 extern u_int m_clalloc_wid; /* mbuf cluster wait count */ 488 extern u_int m_mballoc_wid; /* mbuf wait count */ 489 extern int max_linkhdr; /* largest link-level header */ 490 extern int max_protohdr; /* largest protocol header */ 491 extern int max_hdr; /* largest link+protocol header */ 492 extern int max_datalen; /* MHLEN - max_hdr */ 493 extern int mbuf_wait; /* mbuf sleep time */ 494 extern int nmbclusters; 495 extern int nmbufs; 496 497 struct uio; 498 499 void m_adj(struct mbuf *, int); 500 void m_align(struct mbuf *, int); 501 int m_apply(struct mbuf *, int, int, 502 int (*)(void *, void *, u_int), void *); 503 int m_append(struct mbuf *, int, c_caddr_t); 504 void m_cat(struct mbuf *, struct mbuf *); 505 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt); 506 void m_copyback(struct mbuf *, int, int, caddr_t); 507 void m_copydata(const struct mbuf *, int, int, caddr_t); 508 struct mbuf *m_copym(const struct mbuf *, int, int, int); 509 struct mbuf *m_copypacket(struct mbuf *, int); 510 struct mbuf *m_defrag(struct mbuf *, int); 511 struct mbuf *m_defrag_nofree(struct mbuf *, int); 512 struct mbuf *m_devget(char *, int, int, struct ifnet *, 513 void (*copy)(volatile const void *, volatile void *, size_t)); 514 struct mbuf *m_dup(struct mbuf *, int); 515 struct mbuf *m_dup_data(struct mbuf *, int); 516 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int); 517 void m_extadd(struct mbuf *, caddr_t, u_int, void (*)(void *), 518 void (*)(void *), void *); 519 #ifdef MBUF_DEBUG 520 struct mbuf *_m_free(struct mbuf *, const char *name); 521 void _m_freem(struct mbuf *, const char *name); 522 #else 523 struct mbuf *m_free(struct mbuf *); 524 void m_freem(struct mbuf *); 525 #endif 526 struct mbuf *m_get(int, int); 527 struct mbuf *m_getc(int len, int how, int type); 528 struct mbuf *m_getcl(int how, short type, int flags); 529 struct mbuf *m_getjcl(int how, short type, int flags, size_t size); 530 struct mbuf *m_getclr(int, int); 531 struct mbuf *m_gethdr(int, int); 532 struct mbuf *m_getm(struct mbuf *, int, int, int); 533 struct mbuf *m_getptr(struct mbuf *, int, int *); 534 struct mbuf *m_last(struct mbuf *m); 535 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm); 536 void m_move_pkthdr(struct mbuf *, struct mbuf *); 537 struct mbuf *m_prepend(struct mbuf *, int, int); 538 void m_print(const struct mbuf *m); 539 struct mbuf *m_pulldown(struct mbuf *, int, int, int *); 540 struct mbuf *m_pullup(struct mbuf *, int); 541 struct mbuf *m_split(struct mbuf *, int, int); 542 struct mbuf *m_uiomove(struct uio *); 543 struct mbuf *m_unshare(struct mbuf *, int); 544 void m_mclget(struct mbuf *m, int how); 545 int m_sharecount(struct mbuf *m); 546 void m_chtype(struct mbuf *m, int type); 547 int m_devpad(struct mbuf *m, int padto); 548 549 #ifdef MBUF_DEBUG 550 551 void mbuftrackid(struct mbuf *, int); 552 553 #define m_free(m) _m_free(m, __func__) 554 #define m_freem(m) _m_freem(m, __func__) 555 556 #else 557 558 #define mbuftrackid(m, id) /* empty */ 559 560 #endif 561 562 /* 563 * Allocate the right type of mbuf for the desired total length. 564 * The mbuf returned does not necessarily cover the entire requested length. 565 * This function follows mbuf chaining policy of allowing MINCLSIZE 566 * amount of chained mbufs. 567 */ 568 static __inline struct mbuf * 569 m_getl(int len, int how, int type, int flags, int *psize) 570 { 571 struct mbuf *m; 572 int size; 573 574 if (len >= MINCLSIZE) { 575 m = m_getcl(how, type, flags); 576 size = MCLBYTES; 577 } else if (flags & M_PKTHDR) { 578 m = m_gethdr(how, type); 579 size = MHLEN; 580 } else { 581 m = m_get(how, type); 582 size = MLEN; 583 } 584 if (psize != NULL) 585 *psize = size; 586 return (m); 587 } 588 589 static __inline struct mbuf * 590 m_getlj(int len, int how, int type, int flags, int *psize) 591 { 592 if (len > MCLBYTES) { 593 struct mbuf *m; 594 595 m = m_getjcl(how, type, flags, MJUMPAGESIZE); 596 if (psize != NULL) 597 *psize = MJUMPAGESIZE; 598 return m; 599 } 600 return m_getl(len, how, type, flags, psize); 601 } 602 603 /* 604 * Get a single mbuf that covers the requested number of bytes. 605 * This function does not create mbuf chains. It explicitly marks 606 * places in the code that abuse mbufs for contiguous data buffers. 607 */ 608 static __inline struct mbuf * 609 m_getb(int len, int how, int type, int flags) 610 { 611 struct mbuf *m; 612 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN; 613 614 if (len > mbufsize) 615 m = m_getcl(how, type, flags); 616 else if (flags & M_PKTHDR) 617 m = m_gethdr(how, type); 618 else 619 m = m_get(how, type); 620 return (m); 621 } 622 623 /* 624 * Packets may have annotations attached by affixing a list 625 * of "packet tags" to the pkthdr structure. Packet tags are 626 * dynamically allocated semi-opaque data structures that have 627 * a fixed header (struct m_tag) that specifies the size of the 628 * memory block and a <cookie,type> pair that identifies it. 629 * The cookie is a 32-bit unique unsigned value used to identify 630 * a module or ABI. By convention this value is chose as the 631 * date+time that the module is created, expressed as the number of 632 * seconds since the epoch (e.g. using date -u +'%s'). The type value 633 * is an ABI/module-specific value that identifies a particular annotation 634 * and is private to the module. For compatibility with systems 635 * like openbsd that define packet tags w/o an ABI/module cookie, 636 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and 637 * m_tag_find compatibility shim functions and several tag types are 638 * defined below. Users that do not require compatibility should use 639 * a private cookie value so that packet tag-related definitions 640 * can be maintained privately. 641 * 642 * Note that the packet tag returned by m_tag_alloc has the default 643 * memory alignment implemented by kmalloc. To reference private data 644 * one can use a construct like: 645 * 646 * struct m_tag *mtag = m_tag_alloc(...); 647 * struct foo *p = m_tag_data(mtag); 648 * 649 * if the alignment of struct m_tag is sufficient for referencing members 650 * of struct foo. Otherwise it is necessary to embed struct m_tag within 651 * the private data structure to insure proper alignment; e.g. 652 * 653 * struct foo { 654 * struct m_tag tag; 655 * ... 656 * }; 657 * struct foo *p = (struct foo *)m_tag_alloc(...); 658 * struct m_tag *mtag = &p->tag; 659 */ 660 661 #define PACKET_TAG_NONE 0 /* Nadda */ 662 663 /* Packet tag for use with PACKET_ABI_COMPAT */ 664 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */ 665 /* struct tdb_indent */ 666 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */ 667 /* struct tdb_indent */ 668 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */ 669 /* struct tdb_indent, never added */ 670 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */ 671 /* struct tdb_indent, never added */ 672 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */ 673 /* struct tdb_indent, never added */ 674 #define PACKET_TAG_ENCAP 6 /* Encap. processing */ 675 /* struct ifnet *, the GIF interface */ 676 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */ 677 /* struct ipsec_history */ 678 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */ 679 /* struct ip6aux */ 680 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */ 681 /* struct divert_info */ 682 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */ 683 /* struct dn_pkt */ 684 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */ 685 /* struct sockaddr_in */ 686 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */ 687 /* struct ip_srcrt_opt */ 688 #define PACKET_TAG_CARP 28 /* CARP info */ 689 /* struct pf_mtag */ 690 #define PACKET_TAG_PF 29 /* PF info */ 691 692 #define PACKET_TAG_PF_DIVERT 0x0200 /* pf(4) diverted packet */ 693 694 695 /* Packet tag routines */ 696 struct m_tag *m_tag_alloc(uint32_t, int, int, int); 697 void m_tag_free(struct m_tag *); 698 void m_tag_prepend(struct mbuf *, struct m_tag *); 699 void m_tag_unlink(struct mbuf *, struct m_tag *); 700 void m_tag_delete(struct mbuf *, struct m_tag *); 701 void m_tag_delete_chain(struct mbuf *); 702 struct m_tag *m_tag_locate(struct mbuf *, uint32_t, int, struct m_tag *); 703 struct m_tag *m_tag_copy(struct m_tag *, int); 704 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int); 705 void m_tag_init(struct mbuf *); 706 struct m_tag *m_tag_first(struct mbuf *); 707 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *); 708 709 /* these are for openbsd compatibility */ 710 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */ 711 712 static __inline void * 713 m_tag_data(struct m_tag *tag) 714 { 715 return ((void *)(tag + 1)); 716 } 717 718 static __inline struct m_tag * 719 m_tag_get(int type, int length, int wait) 720 { 721 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait); 722 } 723 724 static __inline struct m_tag * 725 m_tag_find(struct mbuf *m, int type, struct m_tag *start) 726 { 727 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start); 728 } 729 730 #endif /* _KERNEL */ 731 732 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 733 #endif /* !_SYS_MBUF_H_ */ 734