1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)mbuf.h 8.5 (Berkeley) 2/19/95 31 * $FreeBSD$ 32 */ 33 34 #ifndef _SYS_MBUF_H_ 35 #define _SYS_MBUF_H_ 36 37 /* XXX: These includes suck. Sorry! */ 38 #include <sys/queue.h> 39 #ifdef _KERNEL 40 #include <sys/systm.h> 41 #include <vm/uma.h> 42 #ifdef WITNESS 43 #include <sys/lock.h> 44 #endif 45 #endif 46 47 /* 48 * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead. 49 * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in 50 * sys/param.h), which has no additional overhead and is used instead of the 51 * internal data area; this is done when at least MINCLSIZE of data must be 52 * stored. Additionally, it is possible to allocate a separate buffer 53 * externally and attach it to the mbuf in a way similar to that of mbuf 54 * clusters. 55 * 56 * MLEN is data length in a normal mbuf. 57 * MHLEN is data length in an mbuf with pktheader. 58 * MINCLSIZE is a smallest amount of data that should be put into cluster. 59 */ 60 #define MLEN ((int)(MSIZE - sizeof(struct m_hdr))) 61 #define MHLEN ((int)(MLEN - sizeof(struct pkthdr))) 62 #define MINCLSIZE (MHLEN + 1) 63 64 #ifdef _KERNEL 65 /*- 66 * Macro for type conversion: convert mbuf pointer to data pointer of correct 67 * type: 68 * 69 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. 70 * mtodo(m, o) -- Same as above but with offset 'o' into data. 71 */ 72 #define mtod(m, t) ((t)((m)->m_data)) 73 #define mtodo(m, o) ((void *)(((m)->m_data) + (o))) 74 75 /* 76 * Argument structure passed to UMA routines during mbuf and packet 77 * allocations. 78 */ 79 struct mb_args { 80 int flags; /* Flags for mbuf being allocated */ 81 short type; /* Type of mbuf being allocated */ 82 }; 83 #endif /* _KERNEL */ 84 85 /* 86 * Header present at the beginning of every mbuf. 87 * Size ILP32: 20 88 * LP64: 32 89 */ 90 struct m_hdr { 91 struct mbuf *mh_next; /* next buffer in chain */ 92 struct mbuf *mh_nextpkt; /* next chain in queue/record */ 93 caddr_t mh_data; /* location of data */ 94 int32_t mh_len; /* amount of data in this mbuf */ 95 uint32_t mh_type:8, /* type of data in this mbuf */ 96 mh_flags:24; /* flags; see below */ 97 }; 98 99 /* 100 * Packet tag structure (see below for details). 101 */ 102 struct m_tag { 103 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ 104 u_int16_t m_tag_id; /* Tag ID */ 105 u_int16_t m_tag_len; /* Length of data */ 106 u_int32_t m_tag_cookie; /* ABI/Module ID */ 107 void (*m_tag_free)(struct m_tag *); 108 }; 109 110 /* 111 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 112 * Size ILP32: 48 113 * LP64: 56 114 */ 115 struct pkthdr { 116 struct ifnet *rcvif; /* rcv interface */ 117 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */ 118 int32_t len; /* total packet length */ 119 120 /* Layer crossing persistent information. */ 121 uint32_t flowid; /* packet's 4-tuple system */ 122 uint64_t csum_flags; /* checksum and offload features */ 123 uint16_t fibnum; /* this packet should use this fib */ 124 uint8_t cosqos; /* class/quality of service */ 125 uint8_t rsstype; /* hash type */ 126 uint8_t l2hlen; /* layer 2 header length */ 127 uint8_t l3hlen; /* layer 3 header length */ 128 uint8_t l4hlen; /* layer 4 header length */ 129 uint8_t l5hlen; /* layer 5 header length */ 130 union { 131 uint8_t eigth[8]; 132 uint16_t sixteen[4]; 133 uint32_t thirtytwo[2]; 134 uint64_t sixtyfour[1]; 135 uintptr_t unintptr[1]; 136 void *ptr; 137 } PH_per; 138 139 /* Layer specific non-persistent local storage for reassembly, etc. */ 140 union { 141 uint8_t eigth[8]; 142 uint16_t sixteen[4]; 143 uint32_t thirtytwo[2]; 144 uint64_t sixtyfour[1]; 145 uintptr_t unintptr[1]; 146 void *ptr; 147 } PH_loc; 148 }; 149 #define ether_vtag PH_per.sixteen[0] 150 #define PH_vt PH_per 151 #define vt_nrecs sixteen[0] 152 #define tso_segsz PH_per.sixteen[1] 153 #define csum_phsum PH_per.sixteen[2] 154 #define csum_data PH_per.thirtytwo[1] 155 156 /* 157 * Description of external storage mapped into mbuf; valid only if M_EXT is 158 * set. 159 * Size ILP32: 28 160 * LP64: 48 161 */ 162 struct m_ext { 163 volatile u_int *ref_cnt; /* pointer to ref count info */ 164 caddr_t ext_buf; /* start of buffer */ 165 uint32_t ext_size; /* size of buffer, for ext_free */ 166 uint32_t ext_type:8, /* type of external storage */ 167 ext_flags:24; /* external storage mbuf flags */ 168 int (*ext_free) /* free routine if not the usual */ 169 (struct mbuf *, void *, void *); 170 void *ext_arg1; /* optional argument pointer */ 171 void *ext_arg2; /* optional argument pointer */ 172 }; 173 174 /* 175 * The core of the mbuf object along with some shortcut defines for practical 176 * purposes. 177 */ 178 struct mbuf { 179 struct m_hdr m_hdr; 180 union { 181 struct { 182 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 183 union { 184 struct m_ext MH_ext; /* M_EXT set */ 185 char MH_databuf[MHLEN]; 186 } MH_dat; 187 } MH; 188 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 189 } M_dat; 190 }; 191 #define m_next m_hdr.mh_next 192 #define m_len m_hdr.mh_len 193 #define m_data m_hdr.mh_data 194 #define m_type m_hdr.mh_type 195 #define m_flags m_hdr.mh_flags 196 #define m_nextpkt m_hdr.mh_nextpkt 197 #define m_act m_nextpkt 198 #define m_pkthdr M_dat.MH.MH_pkthdr 199 #define m_ext M_dat.MH.MH_dat.MH_ext 200 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 201 #define m_dat M_dat.M_databuf 202 203 /* 204 * mbuf flags of global significance and layer crossing. 205 * Those of only protocol/layer specific significance are to be mapped 206 * to M_PROTO[1-12] and cleared at layer handoff boundaries. 207 * NB: Limited to the lower 24 bits. 208 */ 209 #define M_EXT 0x00000001 /* has associated external storage */ 210 #define M_PKTHDR 0x00000002 /* start of record */ 211 #define M_EOR 0x00000004 /* end of record */ 212 #define M_RDONLY 0x00000008 /* associated data is marked read-only */ 213 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */ 214 #define M_MCAST 0x00000020 /* send/received as link-level multicast */ 215 #define M_PROMISC 0x00000040 /* packet was not for us */ 216 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */ 217 #define M_FLOWID 0x00000100 /* deprecated: flowid is valid */ 218 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */ 219 220 #define M_PROTO1 0x00001000 /* protocol-specific */ 221 #define M_PROTO2 0x00002000 /* protocol-specific */ 222 #define M_PROTO3 0x00004000 /* protocol-specific */ 223 #define M_PROTO4 0x00008000 /* protocol-specific */ 224 #define M_PROTO5 0x00010000 /* protocol-specific */ 225 #define M_PROTO6 0x00020000 /* protocol-specific */ 226 #define M_PROTO7 0x00040000 /* protocol-specific */ 227 #define M_PROTO8 0x00080000 /* protocol-specific */ 228 #define M_PROTO9 0x00100000 /* protocol-specific */ 229 #define M_PROTO10 0x00200000 /* protocol-specific */ 230 #define M_PROTO11 0x00400000 /* protocol-specific */ 231 #define M_PROTO12 0x00800000 /* protocol-specific */ 232 233 /* 234 * Flags to purge when crossing layers. 235 */ 236 #define M_PROTOFLAGS \ 237 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\ 238 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12) 239 240 /* 241 * Flags preserved when copying m_pkthdr. 242 */ 243 #define M_COPYFLAGS \ 244 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_VLANTAG|M_PROMISC| \ 245 M_PROTOFLAGS) 246 247 /* 248 * Mbuf flag description for use with printf(9) %b identifier. 249 */ 250 #define M_FLAG_BITS \ 251 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \ 252 "\7M_PROMISC\10M_VLANTAG\11M_FLOWID" 253 #define M_FLAG_PROTOBITS \ 254 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \ 255 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \ 256 "\27M_PROTO11\30M_PROTO12" 257 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS) 258 259 /* 260 * Network interface cards are able to hash protocol fields (such as IPv4 261 * addresses and TCP port numbers) classify packets into flows. These flows 262 * can then be used to maintain ordering while delivering packets to the OS 263 * via parallel input queues, as well as to provide a stateless affinity 264 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set 265 * m_flag fields to indicate how the hash should be interpreted by the 266 * network stack. 267 * 268 * Most NICs support RSS, which provides ordering and explicit affinity, and 269 * use the hash m_flag bits to indicate what header fields were covered by 270 * the hash. M_HASHTYPE_OPAQUE can be set by non-RSS cards or configurations 271 * that provide an opaque flow identifier, allowing for ordering and 272 * distribution without explicit affinity. 273 */ 274 #define M_HASHTYPE_NONE 0 275 #define M_HASHTYPE_RSS_IPV4 1 /* IPv4 2-tuple */ 276 #define M_HASHTYPE_RSS_TCP_IPV4 2 /* TCPv4 4-tuple */ 277 #define M_HASHTYPE_RSS_IPV6 3 /* IPv6 2-tuple */ 278 #define M_HASHTYPE_RSS_TCP_IPV6 4 /* TCPv6 4-tuple */ 279 #define M_HASHTYPE_RSS_IPV6_EX 5 /* IPv6 2-tuple + ext hdrs */ 280 #define M_HASHTYPE_RSS_TCP_IPV6_EX 6 /* TCPv6 4-tiple + ext hdrs */ 281 #define M_HASHTYPE_OPAQUE 255 /* ordering, not affinity */ 282 283 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0) 284 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype) 285 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v)) 286 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v)) 287 288 /* 289 * COS/QOS class and quality of service tags. 290 * It uses DSCP code points as base. 291 */ 292 #define QOS_DSCP_CS0 0x00 293 #define QOS_DSCP_DEF QOS_DSCP_CS0 294 #define QOS_DSCP_CS1 0x20 295 #define QOS_DSCP_AF11 0x28 296 #define QOS_DSCP_AF12 0x30 297 #define QOS_DSCP_AF13 0x38 298 #define QOS_DSCP_CS2 0x40 299 #define QOS_DSCP_AF21 0x48 300 #define QOS_DSCP_AF22 0x50 301 #define QOS_DSCP_AF23 0x58 302 #define QOS_DSCP_CS3 0x60 303 #define QOS_DSCP_AF31 0x68 304 #define QOS_DSCP_AF32 0x70 305 #define QOS_DSCP_AF33 0x78 306 #define QOS_DSCP_CS4 0x80 307 #define QOS_DSCP_AF41 0x88 308 #define QOS_DSCP_AF42 0x90 309 #define QOS_DSCP_AF43 0x98 310 #define QOS_DSCP_CS5 0xa0 311 #define QOS_DSCP_EF 0xb8 312 #define QOS_DSCP_CS6 0xc0 313 #define QOS_DSCP_CS7 0xe0 314 315 /* 316 * External mbuf storage buffer types. 317 */ 318 #define EXT_CLUSTER 1 /* mbuf cluster */ 319 #define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */ 320 #define EXT_JUMBOP 3 /* jumbo cluster 4096 bytes */ 321 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */ 322 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */ 323 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */ 324 #define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */ 325 326 #define EXT_VENDOR1 224 /* for vendor-internal use */ 327 #define EXT_VENDOR2 225 /* for vendor-internal use */ 328 #define EXT_VENDOR3 226 /* for vendor-internal use */ 329 #define EXT_VENDOR4 227 /* for vendor-internal use */ 330 331 #define EXT_EXP1 244 /* for experimental use */ 332 #define EXT_EXP2 245 /* for experimental use */ 333 #define EXT_EXP3 246 /* for experimental use */ 334 #define EXT_EXP4 247 /* for experimental use */ 335 336 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */ 337 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */ 338 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */ 339 #define EXT_EXTREF 255 /* has externally maintained ref_cnt ptr */ 340 341 /* 342 * Flags for external mbuf buffer types. 343 * NB: limited to the lower 24 bits. 344 */ 345 #define EXT_FLAG_EMBREF 0x000001 /* embedded ref_cnt, notyet */ 346 #define EXT_FLAG_EXTREF 0x000002 /* external ref_cnt, notyet */ 347 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */ 348 349 #define EXT_FLAG_VENDOR1 0x010000 /* for vendor-internal use */ 350 #define EXT_FLAG_VENDOR2 0x020000 /* for vendor-internal use */ 351 #define EXT_FLAG_VENDOR3 0x040000 /* for vendor-internal use */ 352 #define EXT_FLAG_VENDOR4 0x080000 /* for vendor-internal use */ 353 354 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */ 355 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */ 356 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */ 357 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */ 358 359 /* 360 * EXT flag description for use with printf(9) %b identifier. 361 */ 362 #define EXT_FLAG_BITS \ 363 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \ 364 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \ 365 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \ 366 "\30EXT_FLAG_EXP4" 367 368 /* 369 * Return values for (*ext_free). 370 */ 371 #define EXT_FREE_OK 0 /* Normal return */ 372 373 /* 374 * Flags indicating checksum, segmentation and other offload work to be 375 * done, or already done, by hardware or lower layers. It is split into 376 * separate inbound and outbound flags. 377 * 378 * Outbound flags that are set by upper protocol layers requesting lower 379 * layers, or ideally the hardware, to perform these offloading tasks. 380 * For outbound packets this field and its flags can be directly tested 381 * against if_data.ifi_hwassist. 382 */ 383 #define CSUM_IP 0x00000001 /* IP header checksum offload */ 384 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */ 385 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */ 386 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */ 387 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */ 388 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */ 389 390 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */ 391 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */ 392 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */ 393 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */ 394 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */ 395 396 /* Inbound checksum support where the checksum was verified by hardware. */ 397 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */ 398 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */ 399 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */ 400 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */ 401 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */ 402 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */ 403 #define CSUM_COALESED 0x40000000 /* contains merged segments */ 404 405 /* 406 * CSUM flag description for use with printf(9) %b identifier. 407 */ 408 #define CSUM_BITS \ 409 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \ 410 "\6CSUM_IP_ISCSI" \ 411 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \ 412 "\16CSUM_IP6_ISCSI" \ 413 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \ 414 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESED" 415 416 /* CSUM flags compatibility mappings. */ 417 #define CSUM_IP_CHECKED CSUM_L3_CALC 418 #define CSUM_IP_VALID CSUM_L3_VALID 419 #define CSUM_DATA_VALID CSUM_L4_VALID 420 #define CSUM_PSEUDO_HDR CSUM_L4_CALC 421 #define CSUM_SCTP_VALID CSUM_L4_VALID 422 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP) 423 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */ 424 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6) 425 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID 426 #define CSUM_TCP CSUM_IP_TCP 427 #define CSUM_UDP CSUM_IP_UDP 428 #define CSUM_SCTP CSUM_IP_SCTP 429 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO) 430 #define CSUM_UDP_IPV6 CSUM_IP6_UDP 431 #define CSUM_TCP_IPV6 CSUM_IP6_TCP 432 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP 433 #define CSUM_FRAGMENT 0x0 /* Unused */ 434 435 /* 436 * mbuf types describing the content of the mbuf (including external storage). 437 */ 438 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */ 439 #define MT_DATA 1 /* dynamic (data) allocation */ 440 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */ 441 442 #define MT_VENDOR1 4 /* for vendor-internal use */ 443 #define MT_VENDOR2 5 /* for vendor-internal use */ 444 #define MT_VENDOR3 6 /* for vendor-internal use */ 445 #define MT_VENDOR4 7 /* for vendor-internal use */ 446 447 #define MT_SONAME 8 /* socket name */ 448 449 #define MT_EXP1 9 /* for experimental use */ 450 #define MT_EXP2 10 /* for experimental use */ 451 #define MT_EXP3 11 /* for experimental use */ 452 #define MT_EXP4 12 /* for experimental use */ 453 454 #define MT_CONTROL 14 /* extra-data protocol message */ 455 #define MT_OOBDATA 15 /* expedited data */ 456 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */ 457 458 #define MT_NOINIT 255 /* Not a type but a flag to allocate 459 a non-initialized mbuf */ 460 461 /* 462 * Compatibility with historic mbuf allocator. 463 */ 464 #define MBTOM(how) (how) 465 #define M_DONTWAIT M_NOWAIT 466 #define M_TRYWAIT M_WAITOK 467 #define M_WAIT M_WAITOK 468 469 /* 470 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to 471 * !_KERNEL so that monitoring tools can look up the zones with 472 * libmemstat(3). 473 */ 474 #define MBUF_MEM_NAME "mbuf" 475 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster" 476 #define MBUF_PACKET_MEM_NAME "mbuf_packet" 477 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page" 478 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k" 479 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k" 480 #define MBUF_TAG_MEM_NAME "mbuf_tag" 481 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt" 482 483 #ifdef _KERNEL 484 485 #ifdef WITNESS 486 #define MBUF_CHECKSLEEP(how) do { \ 487 if (how == M_WAITOK) \ 488 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \ 489 "Sleeping in \"%s\"", __func__); \ 490 } while (0) 491 #else 492 #define MBUF_CHECKSLEEP(how) 493 #endif 494 495 /* 496 * Network buffer allocation API 497 * 498 * The rest of it is defined in kern/kern_mbuf.c 499 */ 500 extern uma_zone_t zone_mbuf; 501 extern uma_zone_t zone_clust; 502 extern uma_zone_t zone_pack; 503 extern uma_zone_t zone_jumbop; 504 extern uma_zone_t zone_jumbo9; 505 extern uma_zone_t zone_jumbo16; 506 extern uma_zone_t zone_ext_refcnt; 507 508 void mb_free_ext(struct mbuf *); 509 int m_pkthdr_init(struct mbuf *, int); 510 511 static __inline int 512 m_gettype(int size) 513 { 514 int type; 515 516 switch (size) { 517 case MSIZE: 518 type = EXT_MBUF; 519 break; 520 case MCLBYTES: 521 type = EXT_CLUSTER; 522 break; 523 #if MJUMPAGESIZE != MCLBYTES 524 case MJUMPAGESIZE: 525 type = EXT_JUMBOP; 526 break; 527 #endif 528 case MJUM9BYTES: 529 type = EXT_JUMBO9; 530 break; 531 case MJUM16BYTES: 532 type = EXT_JUMBO16; 533 break; 534 default: 535 panic("%s: invalid cluster size", __func__); 536 } 537 538 return (type); 539 } 540 541 static __inline uma_zone_t 542 m_getzone(int size) 543 { 544 uma_zone_t zone; 545 546 switch (size) { 547 case MCLBYTES: 548 zone = zone_clust; 549 break; 550 #if MJUMPAGESIZE != MCLBYTES 551 case MJUMPAGESIZE: 552 zone = zone_jumbop; 553 break; 554 #endif 555 case MJUM9BYTES: 556 zone = zone_jumbo9; 557 break; 558 case MJUM16BYTES: 559 zone = zone_jumbo16; 560 break; 561 default: 562 panic("%s: invalid cluster size", __func__); 563 } 564 565 return (zone); 566 } 567 568 /* 569 * Initialize an mbuf with linear storage. 570 * 571 * Inline because the consumer text overhead will be roughly the same to 572 * initialize or call a function with this many parameters and M_PKTHDR 573 * should go away with constant propagation for !MGETHDR. 574 */ 575 static __inline int 576 m_init(struct mbuf *m, uma_zone_t zone, int size, int how, short type, 577 int flags) 578 { 579 int error; 580 581 m->m_next = NULL; 582 m->m_nextpkt = NULL; 583 m->m_data = m->m_dat; 584 m->m_len = 0; 585 m->m_flags = flags; 586 m->m_type = type; 587 if (flags & M_PKTHDR) { 588 if ((error = m_pkthdr_init(m, how)) != 0) 589 return (error); 590 } 591 592 return (0); 593 } 594 595 static __inline struct mbuf * 596 m_get(int how, short type) 597 { 598 struct mb_args args; 599 600 args.flags = 0; 601 args.type = type; 602 return (uma_zalloc_arg(zone_mbuf, &args, how)); 603 } 604 605 /* 606 * XXX This should be deprecated, very little use. 607 */ 608 static __inline struct mbuf * 609 m_getclr(int how, short type) 610 { 611 struct mbuf *m; 612 struct mb_args args; 613 614 args.flags = 0; 615 args.type = type; 616 m = uma_zalloc_arg(zone_mbuf, &args, how); 617 if (m != NULL) 618 bzero(m->m_data, MLEN); 619 return (m); 620 } 621 622 static __inline struct mbuf * 623 m_gethdr(int how, short type) 624 { 625 struct mb_args args; 626 627 args.flags = M_PKTHDR; 628 args.type = type; 629 return (uma_zalloc_arg(zone_mbuf, &args, how)); 630 } 631 632 static __inline struct mbuf * 633 m_getcl(int how, short type, int flags) 634 { 635 struct mb_args args; 636 637 args.flags = flags; 638 args.type = type; 639 return (uma_zalloc_arg(zone_pack, &args, how)); 640 } 641 642 static __inline struct mbuf * 643 m_free(struct mbuf *m) 644 { 645 struct mbuf *n = m->m_next; 646 647 if (m->m_flags & M_EXT) 648 mb_free_ext(m); 649 else if ((m->m_flags & M_NOFREE) == 0) 650 uma_zfree(zone_mbuf, m); 651 return (n); 652 } 653 654 static __inline void 655 m_clget(struct mbuf *m, int how) 656 { 657 658 if (m->m_flags & M_EXT) 659 printf("%s: %p mbuf already has cluster\n", __func__, m); 660 m->m_ext.ext_buf = (char *)NULL; 661 uma_zalloc_arg(zone_clust, m, how); 662 /* 663 * On a cluster allocation failure, drain the packet zone and retry, 664 * we might be able to loosen a few clusters up on the drain. 665 */ 666 if ((how & M_NOWAIT) && (m->m_ext.ext_buf == NULL)) { 667 zone_drain(zone_pack); 668 uma_zalloc_arg(zone_clust, m, how); 669 } 670 } 671 672 /* 673 * m_cljget() is different from m_clget() as it can allocate clusters without 674 * attaching them to an mbuf. In that case the return value is the pointer 675 * to the cluster of the requested size. If an mbuf was specified, it gets 676 * the cluster attached to it and the return value can be safely ignored. 677 * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES. 678 */ 679 static __inline void * 680 m_cljget(struct mbuf *m, int how, int size) 681 { 682 uma_zone_t zone; 683 684 if (m && m->m_flags & M_EXT) 685 printf("%s: %p mbuf already has cluster\n", __func__, m); 686 if (m != NULL) 687 m->m_ext.ext_buf = NULL; 688 689 zone = m_getzone(size); 690 return (uma_zalloc_arg(zone, m, how)); 691 } 692 693 static __inline void 694 m_cljset(struct mbuf *m, void *cl, int type) 695 { 696 uma_zone_t zone; 697 int size; 698 699 switch (type) { 700 case EXT_CLUSTER: 701 size = MCLBYTES; 702 zone = zone_clust; 703 break; 704 #if MJUMPAGESIZE != MCLBYTES 705 case EXT_JUMBOP: 706 size = MJUMPAGESIZE; 707 zone = zone_jumbop; 708 break; 709 #endif 710 case EXT_JUMBO9: 711 size = MJUM9BYTES; 712 zone = zone_jumbo9; 713 break; 714 case EXT_JUMBO16: 715 size = MJUM16BYTES; 716 zone = zone_jumbo16; 717 break; 718 default: 719 panic("%s: unknown cluster type", __func__); 720 break; 721 } 722 723 m->m_data = m->m_ext.ext_buf = cl; 724 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL; 725 m->m_ext.ext_size = size; 726 m->m_ext.ext_type = type; 727 m->m_ext.ext_flags = 0; 728 m->m_ext.ref_cnt = uma_find_refcnt(zone, cl); 729 m->m_flags |= M_EXT; 730 731 } 732 733 static __inline void 734 m_chtype(struct mbuf *m, short new_type) 735 { 736 737 m->m_type = new_type; 738 } 739 740 static __inline void 741 m_clrprotoflags(struct mbuf *m) 742 { 743 744 m->m_flags &= ~M_PROTOFLAGS; 745 } 746 747 static __inline struct mbuf * 748 m_last(struct mbuf *m) 749 { 750 751 while (m->m_next) 752 m = m->m_next; 753 return (m); 754 } 755 756 /* 757 * mbuf, cluster, and external object allocation macros (for compatibility 758 * purposes). 759 */ 760 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from)) 761 #define MGET(m, how, type) ((m) = m_get((how), (type))) 762 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type))) 763 #define MCLGET(m, how) m_clget((m), (how)) 764 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \ 765 (void )m_extadd((m), (caddr_t)(buf), (size), (free), (arg1), (arg2),\ 766 (flags), (type), M_NOWAIT) 767 #define m_getm(m, len, how, type) \ 768 m_getm2((m), (len), (how), (type), M_PKTHDR) 769 770 /* 771 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can 772 * be both the local data payload, or an external buffer area, depending on 773 * whether M_EXT is set). 774 */ 775 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \ 776 (!(((m)->m_flags & M_EXT)) || \ 777 (*((m)->m_ext.ref_cnt) == 1)) ) \ 778 779 /* Check if the supplied mbuf has a packet header, or else panic. */ 780 #define M_ASSERTPKTHDR(m) \ 781 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \ 782 ("%s: no mbuf packet header!", __func__)) 783 784 /* 785 * Ensure that the supplied mbuf is a valid, non-free mbuf. 786 * 787 * XXX: Broken at the moment. Need some UMA magic to make it work again. 788 */ 789 #define M_ASSERTVALID(m) \ 790 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \ 791 ("%s: attempted use of a free mbuf!", __func__)) 792 793 /* 794 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an 795 * object of the specified size at the end of the mbuf, longword aligned. 796 */ 797 #define M_ALIGN(m, len) do { \ 798 KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)), \ 799 ("%s: M_ALIGN not normal mbuf", __func__)); \ 800 KASSERT((m)->m_data == (m)->m_dat, \ 801 ("%s: M_ALIGN not a virgin mbuf", __func__)); \ 802 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 803 } while (0) 804 805 /* 806 * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by 807 * M_DUP/MOVE_PKTHDR. 808 */ 809 #define MH_ALIGN(m, len) do { \ 810 KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT), \ 811 ("%s: MH_ALIGN not PKTHDR mbuf", __func__)); \ 812 KASSERT((m)->m_data == (m)->m_pktdat, \ 813 ("%s: MH_ALIGN not a virgin mbuf", __func__)); \ 814 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 815 } while (0) 816 817 /* 818 * As above, for mbuf with external storage. 819 */ 820 #define MEXT_ALIGN(m, len) do { \ 821 KASSERT((m)->m_flags & M_EXT, \ 822 ("%s: MEXT_ALIGN not an M_EXT mbuf", __func__)); \ 823 KASSERT((m)->m_data == (m)->m_ext.ext_buf, \ 824 ("%s: MEXT_ALIGN not a virgin mbuf", __func__)); \ 825 (m)->m_data += ((m)->m_ext.ext_size - (len)) & \ 826 ~(sizeof(long) - 1); \ 827 } while (0) 828 829 /* 830 * Compute the amount of space available before the current start of data in 831 * an mbuf. 832 * 833 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 834 * of checking writability of the mbuf data area rests solely with the caller. 835 */ 836 #define M_LEADINGSPACE(m) \ 837 ((m)->m_flags & M_EXT ? \ 838 (M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ 839 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ 840 (m)->m_data - (m)->m_dat) 841 842 /* 843 * Compute the amount of space available after the end of data in an mbuf. 844 * 845 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 846 * of checking writability of the mbuf data area rests solely with the caller. 847 */ 848 #define M_TRAILINGSPACE(m) \ 849 ((m)->m_flags & M_EXT ? \ 850 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ 851 - ((m)->m_data + (m)->m_len) : 0) : \ 852 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) 853 854 /* 855 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be 856 * allocated, how specifies whether to wait. If the allocation fails, the 857 * original mbuf chain is freed and m is set to NULL. 858 */ 859 #define M_PREPEND(m, plen, how) do { \ 860 struct mbuf **_mmp = &(m); \ 861 struct mbuf *_mm = *_mmp; \ 862 int _mplen = (plen); \ 863 int __mhow = (how); \ 864 \ 865 MBUF_CHECKSLEEP(how); \ 866 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 867 _mm->m_data -= _mplen; \ 868 _mm->m_len += _mplen; \ 869 } else \ 870 _mm = m_prepend(_mm, _mplen, __mhow); \ 871 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ 872 _mm->m_pkthdr.len += _mplen; \ 873 *_mmp = _mm; \ 874 } while (0) 875 876 /* 877 * Change mbuf to new type. This is a relatively expensive operation and 878 * should be avoided. 879 */ 880 #define MCHTYPE(m, t) m_chtype((m), (t)) 881 882 /* Length to m_copy to copy all. */ 883 #define M_COPYALL 1000000000 884 885 /* Compatibility with 4.3. */ 886 #define m_copy(m, o, l) m_copym((m), (o), (l), M_NOWAIT) 887 888 extern int max_datalen; /* MHLEN - max_hdr */ 889 extern int max_hdr; /* Largest link + protocol header */ 890 extern int max_linkhdr; /* Largest link-level header */ 891 extern int max_protohdr; /* Largest protocol header */ 892 extern int nmbclusters; /* Maximum number of clusters */ 893 894 struct uio; 895 896 void m_adj(struct mbuf *, int); 897 void m_align(struct mbuf *, int); 898 int m_apply(struct mbuf *, int, int, 899 int (*)(void *, void *, u_int), void *); 900 int m_append(struct mbuf *, int, c_caddr_t); 901 void m_cat(struct mbuf *, struct mbuf *); 902 int m_extadd(struct mbuf *, caddr_t, u_int, 903 int (*)(struct mbuf *, void *, void *), void *, void *, 904 int, int, int); 905 struct mbuf *m_collapse(struct mbuf *, int, int); 906 void m_copyback(struct mbuf *, int, int, c_caddr_t); 907 void m_copydata(const struct mbuf *, int, int, caddr_t); 908 struct mbuf *m_copym(struct mbuf *, int, int, int); 909 struct mbuf *m_copymdata(struct mbuf *, struct mbuf *, 910 int, int, int, int); 911 struct mbuf *m_copypacket(struct mbuf *, int); 912 void m_copy_pkthdr(struct mbuf *, struct mbuf *); 913 struct mbuf *m_copyup(struct mbuf *, int, int); 914 struct mbuf *m_defrag(struct mbuf *, int); 915 void m_demote(struct mbuf *, int); 916 struct mbuf *m_devget(char *, int, int, struct ifnet *, 917 void (*)(char *, caddr_t, u_int)); 918 struct mbuf *m_dup(struct mbuf *, int); 919 int m_dup_pkthdr(struct mbuf *, struct mbuf *, int); 920 u_int m_fixhdr(struct mbuf *); 921 struct mbuf *m_fragment(struct mbuf *, int, int); 922 void m_freem(struct mbuf *); 923 struct mbuf *m_get2(int, int, short, int); 924 struct mbuf *m_getjcl(int, short, int, int); 925 struct mbuf *m_getm2(struct mbuf *, int, int, short, int); 926 struct mbuf *m_getptr(struct mbuf *, int, int *); 927 u_int m_length(struct mbuf *, struct mbuf **); 928 int m_mbuftouio(struct uio *, struct mbuf *, int); 929 void m_move_pkthdr(struct mbuf *, struct mbuf *); 930 struct mbuf *m_prepend(struct mbuf *, int, int); 931 void m_print(const struct mbuf *, int); 932 struct mbuf *m_pulldown(struct mbuf *, int, int, int *); 933 struct mbuf *m_pullup(struct mbuf *, int); 934 int m_sanity(struct mbuf *, int); 935 struct mbuf *m_split(struct mbuf *, int, int); 936 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int); 937 struct mbuf *m_unshare(struct mbuf *, int); 938 939 /*- 940 * Network packets may have annotations attached by affixing a list of 941 * "packet tags" to the pkthdr structure. Packet tags are dynamically 942 * allocated semi-opaque data structures that have a fixed header 943 * (struct m_tag) that specifies the size of the memory block and a 944 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique 945 * unsigned value used to identify a module or ABI. By convention this value 946 * is chosen as the date+time that the module is created, expressed as the 947 * number of seconds since the epoch (e.g., using date -u +'%s'). The type 948 * value is an ABI/module-specific value that identifies a particular 949 * annotation and is private to the module. For compatibility with systems 950 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value 951 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find 952 * compatibility shim functions and several tag types are defined below. 953 * Users that do not require compatibility should use a private cookie value 954 * so that packet tag-related definitions can be maintained privately. 955 * 956 * Note that the packet tag returned by m_tag_alloc has the default memory 957 * alignment implemented by malloc. To reference private data one can use a 958 * construct like: 959 * 960 * struct m_tag *mtag = m_tag_alloc(...); 961 * struct foo *p = (struct foo *)(mtag+1); 962 * 963 * if the alignment of struct m_tag is sufficient for referencing members of 964 * struct foo. Otherwise it is necessary to embed struct m_tag within the 965 * private data structure to insure proper alignment; e.g., 966 * 967 * struct foo { 968 * struct m_tag tag; 969 * ... 970 * }; 971 * struct foo *p = (struct foo *) m_tag_alloc(...); 972 * struct m_tag *mtag = &p->tag; 973 */ 974 975 /* 976 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise 977 * tags are expected to ``vanish'' when they pass through a network 978 * interface. For most interfaces this happens normally as the tags are 979 * reclaimed when the mbuf is free'd. However in some special cases 980 * reclaiming must be done manually. An example is packets that pass through 981 * the loopback interface. Also, one must be careful to do this when 982 * ``turning around'' packets (e.g., icmp_reflect). 983 * 984 * To mark a tag persistent bit-or this flag in when defining the tag id. 985 * The tag will then be treated as described above. 986 */ 987 #define MTAG_PERSISTENT 0x800 988 989 #define PACKET_TAG_NONE 0 /* Nadda */ 990 991 /* Packet tags for use with PACKET_ABI_COMPAT. */ 992 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */ 993 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */ 994 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */ 995 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */ 996 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */ 997 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */ 998 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */ 999 #define PACKET_TAG_GIF 8 /* GIF processing done */ 1000 #define PACKET_TAG_GRE 9 /* GRE processing done */ 1001 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */ 1002 #define PACKET_TAG_ENCAP 11 /* Encap. processing */ 1003 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */ 1004 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */ 1005 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */ 1006 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */ 1007 #define PACKET_TAG_DIVERT 17 /* divert info */ 1008 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */ 1009 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */ 1010 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */ 1011 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */ 1012 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */ 1013 #define PACKET_TAG_CARP 28 /* CARP info */ 1014 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */ 1015 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */ 1016 1017 /* Specific cookies and tags. */ 1018 1019 /* Packet tag routines. */ 1020 struct m_tag *m_tag_alloc(u_int32_t, int, int, int); 1021 void m_tag_delete(struct mbuf *, struct m_tag *); 1022 void m_tag_delete_chain(struct mbuf *, struct m_tag *); 1023 void m_tag_free_default(struct m_tag *); 1024 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *); 1025 struct m_tag *m_tag_copy(struct m_tag *, int); 1026 int m_tag_copy_chain(struct mbuf *, struct mbuf *, int); 1027 void m_tag_delete_nonpersistent(struct mbuf *); 1028 1029 /* 1030 * Initialize the list of tags associated with an mbuf. 1031 */ 1032 static __inline void 1033 m_tag_init(struct mbuf *m) 1034 { 1035 1036 SLIST_INIT(&m->m_pkthdr.tags); 1037 } 1038 1039 /* 1040 * Set up the contents of a tag. Note that this does not fill in the free 1041 * method; the caller is expected to do that. 1042 * 1043 * XXX probably should be called m_tag_init, but that was already taken. 1044 */ 1045 static __inline void 1046 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len) 1047 { 1048 1049 t->m_tag_id = type; 1050 t->m_tag_len = len; 1051 t->m_tag_cookie = cookie; 1052 } 1053 1054 /* 1055 * Reclaim resources associated with a tag. 1056 */ 1057 static __inline void 1058 m_tag_free(struct m_tag *t) 1059 { 1060 1061 (*t->m_tag_free)(t); 1062 } 1063 1064 /* 1065 * Return the first tag associated with an mbuf. 1066 */ 1067 static __inline struct m_tag * 1068 m_tag_first(struct mbuf *m) 1069 { 1070 1071 return (SLIST_FIRST(&m->m_pkthdr.tags)); 1072 } 1073 1074 /* 1075 * Return the next tag in the list of tags associated with an mbuf. 1076 */ 1077 static __inline struct m_tag * 1078 m_tag_next(struct mbuf *m, struct m_tag *t) 1079 { 1080 1081 return (SLIST_NEXT(t, m_tag_link)); 1082 } 1083 1084 /* 1085 * Prepend a tag to the list of tags associated with an mbuf. 1086 */ 1087 static __inline void 1088 m_tag_prepend(struct mbuf *m, struct m_tag *t) 1089 { 1090 1091 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link); 1092 } 1093 1094 /* 1095 * Unlink a tag from the list of tags associated with an mbuf. 1096 */ 1097 static __inline void 1098 m_tag_unlink(struct mbuf *m, struct m_tag *t) 1099 { 1100 1101 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link); 1102 } 1103 1104 /* These are for OpenBSD compatibility. */ 1105 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */ 1106 1107 static __inline struct m_tag * 1108 m_tag_get(int type, int length, int wait) 1109 { 1110 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait)); 1111 } 1112 1113 static __inline struct m_tag * 1114 m_tag_find(struct mbuf *m, int type, struct m_tag *start) 1115 { 1116 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL : 1117 m_tag_locate(m, MTAG_ABI_COMPAT, type, start)); 1118 } 1119 1120 static int inline 1121 rt_m_getfib(struct mbuf *m) 1122 { 1123 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf.")); 1124 return (m->m_pkthdr.fibnum); 1125 } 1126 1127 #define M_GETFIB(_m) rt_m_getfib(_m) 1128 1129 #define M_SETFIB(_m, _fib) do { \ 1130 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \ 1131 ((_m)->m_pkthdr.fibnum) = (_fib); \ 1132 } while (0) 1133 1134 #endif /* _KERNEL */ 1135 1136 #ifdef MBUF_PROFILING 1137 void m_profile(struct mbuf *m); 1138 #define M_PROFILE(m) m_profile(m) 1139 #else 1140 #define M_PROFILE(m) 1141 #endif 1142 1143 1144 #endif /* !_SYS_MBUF_H_ */ 1145