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 * NB: These calculation do not take actual compiler-induced alignment and 57 * padding inside the complete struct mbuf into account. Appropriate 58 * attention is required when changing members of struct mbuf. 59 * 60 * MLEN is data length in a normal mbuf. 61 * MHLEN is data length in an mbuf with pktheader. 62 * MINCLSIZE is a smallest amount of data that should be put into cluster. 63 */ 64 #define MLEN ((int)(MSIZE - sizeof(struct m_hdr))) 65 #define MHLEN ((int)(MLEN - sizeof(struct pkthdr))) 66 #define MINCLSIZE (MHLEN + 1) 67 68 #ifdef _KERNEL 69 /*- 70 * Macro for type conversion: convert mbuf pointer to data pointer of correct 71 * type: 72 * 73 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. 74 * mtodo(m, o) -- Same as above but with offset 'o' into data. 75 */ 76 #define mtod(m, t) ((t)((m)->m_data)) 77 #define mtodo(m, o) ((void *)(((m)->m_data) + (o))) 78 79 /* 80 * Argument structure passed to UMA routines during mbuf and packet 81 * allocations. 82 */ 83 struct mb_args { 84 int flags; /* Flags for mbuf being allocated */ 85 short type; /* Type of mbuf being allocated */ 86 }; 87 #endif /* _KERNEL */ 88 89 /* 90 * Header present at the beginning of every mbuf. 91 * Size ILP32: 24 92 * LP64: 32 93 */ 94 struct m_hdr { 95 struct mbuf *mh_next; /* next buffer in chain */ 96 struct mbuf *mh_nextpkt; /* next chain in queue/record */ 97 caddr_t mh_data; /* location of data */ 98 int32_t mh_len; /* amount of data in this mbuf */ 99 uint32_t mh_type:8, /* type of data in this mbuf */ 100 mh_flags:24; /* flags; see below */ 101 #if !defined(__LP64__) 102 uint32_t mh_pad; /* pad for 64bit alignment */ 103 #endif 104 }; 105 106 /* 107 * Packet tag structure (see below for details). 108 */ 109 struct m_tag { 110 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ 111 u_int16_t m_tag_id; /* Tag ID */ 112 u_int16_t m_tag_len; /* Length of data */ 113 u_int32_t m_tag_cookie; /* ABI/Module ID */ 114 void (*m_tag_free)(struct m_tag *); 115 }; 116 117 /* 118 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 119 * Size ILP32: 48 120 * LP64: 56 121 */ 122 struct pkthdr { 123 struct ifnet *rcvif; /* rcv interface */ 124 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */ 125 int32_t len; /* total packet length */ 126 127 /* Layer crossing persistent information. */ 128 uint32_t flowid; /* packet's 4-tuple system */ 129 uint64_t csum_flags; /* checksum and offload features */ 130 uint16_t fibnum; /* this packet should use this fib */ 131 uint8_t cosqos; /* class/quality of service */ 132 uint8_t rsstype; /* hash type */ 133 uint8_t l2hlen; /* layer 2 header length */ 134 uint8_t l3hlen; /* layer 3 header length */ 135 uint8_t l4hlen; /* layer 4 header length */ 136 uint8_t l5hlen; /* layer 5 header length */ 137 union { 138 uint8_t eight[8]; 139 uint16_t sixteen[4]; 140 uint32_t thirtytwo[2]; 141 uint64_t sixtyfour[1]; 142 uintptr_t unintptr[1]; 143 void *ptr; 144 } PH_per; 145 146 /* Layer specific non-persistent local storage for reassembly, etc. */ 147 union { 148 uint8_t eight[8]; 149 uint16_t sixteen[4]; 150 uint32_t thirtytwo[2]; 151 uint64_t sixtyfour[1]; 152 uintptr_t unintptr[1]; 153 void *ptr; 154 } PH_loc; 155 }; 156 #define ether_vtag PH_per.sixteen[0] 157 #define PH_vt PH_per 158 #define vt_nrecs sixteen[0] 159 #define tso_segsz PH_per.sixteen[1] 160 #define csum_phsum PH_per.sixteen[2] 161 #define csum_data PH_per.thirtytwo[1] 162 #define pkt_tcphdr PH_loc.ptr 163 164 /* 165 * Description of external storage mapped into mbuf; valid only if M_EXT is 166 * set. 167 * Size ILP32: 28 168 * LP64: 48 169 */ 170 struct m_ext { 171 volatile u_int *ext_cnt; /* pointer to ref count info */ 172 caddr_t ext_buf; /* start of buffer */ 173 uint32_t ext_size; /* size of buffer, for ext_free */ 174 uint32_t ext_type:8, /* type of external storage */ 175 ext_flags:24; /* external storage mbuf flags */ 176 void (*ext_free) /* free routine if not the usual */ 177 (struct mbuf *, void *, void *); 178 void *ext_arg1; /* optional argument pointer */ 179 void *ext_arg2; /* optional argument pointer */ 180 }; 181 182 /* 183 * The core of the mbuf object along with some shortcut defines for practical 184 * purposes. 185 */ 186 struct mbuf { 187 struct m_hdr m_hdr; 188 union { 189 struct { 190 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 191 union { 192 struct m_ext MH_ext; /* M_EXT set */ 193 char MH_databuf[MHLEN]; 194 } MH_dat; 195 } MH; 196 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 197 } M_dat; 198 }; 199 #define m_next m_hdr.mh_next 200 #define m_len m_hdr.mh_len 201 #define m_data m_hdr.mh_data 202 #define m_type m_hdr.mh_type 203 #define m_flags m_hdr.mh_flags 204 #define m_nextpkt m_hdr.mh_nextpkt 205 #define m_pkthdr M_dat.MH.MH_pkthdr 206 #define m_ext M_dat.MH.MH_dat.MH_ext 207 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 208 #define m_dat M_dat.M_databuf 209 210 /* 211 * mbuf flags of global significance and layer crossing. 212 * Those of only protocol/layer specific significance are to be mapped 213 * to M_PROTO[1-12] and cleared at layer handoff boundaries. 214 * NB: Limited to the lower 24 bits. 215 */ 216 #define M_EXT 0x00000001 /* has associated external storage */ 217 #define M_PKTHDR 0x00000002 /* start of record */ 218 #define M_EOR 0x00000004 /* end of record */ 219 #define M_RDONLY 0x00000008 /* associated data is marked read-only */ 220 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */ 221 #define M_MCAST 0x00000020 /* send/received as link-level multicast */ 222 #define M_PROMISC 0x00000040 /* packet was not for us */ 223 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */ 224 #define M_FLOWID 0x00000100 /* deprecated: flowid is valid */ 225 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */ 226 227 #define M_PROTO1 0x00001000 /* protocol-specific */ 228 #define M_PROTO2 0x00002000 /* protocol-specific */ 229 #define M_PROTO3 0x00004000 /* protocol-specific */ 230 #define M_PROTO4 0x00008000 /* protocol-specific */ 231 #define M_PROTO5 0x00010000 /* protocol-specific */ 232 #define M_PROTO6 0x00020000 /* protocol-specific */ 233 #define M_PROTO7 0x00040000 /* protocol-specific */ 234 #define M_PROTO8 0x00080000 /* protocol-specific */ 235 #define M_PROTO9 0x00100000 /* protocol-specific */ 236 #define M_PROTO10 0x00200000 /* protocol-specific */ 237 #define M_PROTO11 0x00400000 /* protocol-specific */ 238 #define M_PROTO12 0x00800000 /* protocol-specific */ 239 240 /* 241 * Flags to purge when crossing layers. 242 */ 243 #define M_PROTOFLAGS \ 244 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\ 245 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12) 246 247 /* 248 * Flags preserved when copying m_pkthdr. 249 */ 250 #define M_COPYFLAGS \ 251 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG|M_FLOWID| \ 252 M_PROTOFLAGS) 253 254 /* 255 * Mbuf flag description for use with printf(9) %b identifier. 256 */ 257 #define M_FLAG_BITS \ 258 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \ 259 "\7M_PROMISC\10M_VLANTAG\11M_FLOWID" 260 #define M_FLAG_PROTOBITS \ 261 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \ 262 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \ 263 "\27M_PROTO11\30M_PROTO12" 264 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS) 265 266 /* 267 * Network interface cards are able to hash protocol fields (such as IPv4 268 * addresses and TCP port numbers) classify packets into flows. These flows 269 * can then be used to maintain ordering while delivering packets to the OS 270 * via parallel input queues, as well as to provide a stateless affinity 271 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set 272 * m_flag fields to indicate how the hash should be interpreted by the 273 * network stack. 274 * 275 * Most NICs support RSS, which provides ordering and explicit affinity, and 276 * use the hash m_flag bits to indicate what header fields were covered by 277 * the hash. M_HASHTYPE_OPAQUE can be set by non-RSS cards or configurations 278 * that provide an opaque flow identifier, allowing for ordering and 279 * distribution without explicit affinity. 280 */ 281 /* Microsoft RSS standard hash types */ 282 #define M_HASHTYPE_NONE 0 283 #define M_HASHTYPE_RSS_IPV4 1 /* IPv4 2-tuple */ 284 #define M_HASHTYPE_RSS_TCP_IPV4 2 /* TCPv4 4-tuple */ 285 #define M_HASHTYPE_RSS_IPV6 3 /* IPv6 2-tuple */ 286 #define M_HASHTYPE_RSS_TCP_IPV6 4 /* TCPv6 4-tuple */ 287 #define M_HASHTYPE_RSS_IPV6_EX 5 /* IPv6 2-tuple + ext hdrs */ 288 #define M_HASHTYPE_RSS_TCP_IPV6_EX 6 /* TCPv6 4-tiple + ext hdrs */ 289 /* Non-standard RSS hash types */ 290 #define M_HASHTYPE_RSS_UDP_IPV4 7 /* IPv4 UDP 4-tuple */ 291 #define M_HASHTYPE_RSS_UDP_IPV4_EX 8 /* IPv4 UDP 4-tuple + ext hdrs */ 292 #define M_HASHTYPE_RSS_UDP_IPV6 9 /* IPv6 UDP 4-tuple */ 293 #define M_HASHTYPE_RSS_UDP_IPV6_EX 10 /* IPv6 UDP 4-tuple + ext hdrs */ 294 295 #define M_HASHTYPE_OPAQUE 255 /* ordering, not affinity */ 296 297 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0) 298 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype) 299 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v)) 300 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v)) 301 302 /* 303 * COS/QOS class and quality of service tags. 304 * It uses DSCP code points as base. 305 */ 306 #define QOS_DSCP_CS0 0x00 307 #define QOS_DSCP_DEF QOS_DSCP_CS0 308 #define QOS_DSCP_CS1 0x20 309 #define QOS_DSCP_AF11 0x28 310 #define QOS_DSCP_AF12 0x30 311 #define QOS_DSCP_AF13 0x38 312 #define QOS_DSCP_CS2 0x40 313 #define QOS_DSCP_AF21 0x48 314 #define QOS_DSCP_AF22 0x50 315 #define QOS_DSCP_AF23 0x58 316 #define QOS_DSCP_CS3 0x60 317 #define QOS_DSCP_AF31 0x68 318 #define QOS_DSCP_AF32 0x70 319 #define QOS_DSCP_AF33 0x78 320 #define QOS_DSCP_CS4 0x80 321 #define QOS_DSCP_AF41 0x88 322 #define QOS_DSCP_AF42 0x90 323 #define QOS_DSCP_AF43 0x98 324 #define QOS_DSCP_CS5 0xa0 325 #define QOS_DSCP_EF 0xb8 326 #define QOS_DSCP_CS6 0xc0 327 #define QOS_DSCP_CS7 0xe0 328 329 /* 330 * External mbuf storage buffer types. 331 */ 332 #define EXT_CLUSTER 1 /* mbuf cluster */ 333 #define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */ 334 #define EXT_JUMBOP 3 /* jumbo cluster 4096 bytes */ 335 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */ 336 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */ 337 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */ 338 #define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */ 339 340 #define EXT_VENDOR1 224 /* for vendor-internal use */ 341 #define EXT_VENDOR2 225 /* for vendor-internal use */ 342 #define EXT_VENDOR3 226 /* for vendor-internal use */ 343 #define EXT_VENDOR4 227 /* for vendor-internal use */ 344 345 #define EXT_EXP1 244 /* for experimental use */ 346 #define EXT_EXP2 245 /* for experimental use */ 347 #define EXT_EXP3 246 /* for experimental use */ 348 #define EXT_EXP4 247 /* for experimental use */ 349 350 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */ 351 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */ 352 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */ 353 #define EXT_EXTREF 255 /* has externally maintained ext_cnt ptr */ 354 355 /* 356 * Flags for external mbuf buffer types. 357 * NB: limited to the lower 24 bits. 358 */ 359 #define EXT_FLAG_EMBREF 0x000001 /* embedded ext_cnt, notyet */ 360 #define EXT_FLAG_EXTREF 0x000002 /* external ext_cnt, notyet */ 361 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */ 362 363 #define EXT_FLAG_VENDOR1 0x010000 /* for vendor-internal use */ 364 #define EXT_FLAG_VENDOR2 0x020000 /* for vendor-internal use */ 365 #define EXT_FLAG_VENDOR3 0x040000 /* for vendor-internal use */ 366 #define EXT_FLAG_VENDOR4 0x080000 /* for vendor-internal use */ 367 368 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */ 369 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */ 370 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */ 371 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */ 372 373 /* 374 * EXT flag description for use with printf(9) %b identifier. 375 */ 376 #define EXT_FLAG_BITS \ 377 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \ 378 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \ 379 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \ 380 "\30EXT_FLAG_EXP4" 381 382 /* 383 * External reference/free functions. 384 */ 385 void sf_ext_ref(void *, void *); 386 void sf_ext_free(void *, void *); 387 388 /* 389 * Flags indicating checksum, segmentation and other offload work to be 390 * done, or already done, by hardware or lower layers. It is split into 391 * separate inbound and outbound flags. 392 * 393 * Outbound flags that are set by upper protocol layers requesting lower 394 * layers, or ideally the hardware, to perform these offloading tasks. 395 * For outbound packets this field and its flags can be directly tested 396 * against ifnet if_hwassist. 397 */ 398 #define CSUM_IP 0x00000001 /* IP header checksum offload */ 399 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */ 400 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */ 401 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */ 402 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */ 403 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */ 404 405 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */ 406 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */ 407 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */ 408 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */ 409 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */ 410 411 /* Inbound checksum support where the checksum was verified by hardware. */ 412 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */ 413 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */ 414 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */ 415 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */ 416 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */ 417 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */ 418 #define CSUM_COALESED 0x40000000 /* contains merged segments */ 419 420 /* 421 * CSUM flag description for use with printf(9) %b identifier. 422 */ 423 #define CSUM_BITS \ 424 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \ 425 "\6CSUM_IP_ISCSI" \ 426 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \ 427 "\16CSUM_IP6_ISCSI" \ 428 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \ 429 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESED" 430 431 /* CSUM flags compatibility mappings. */ 432 #define CSUM_IP_CHECKED CSUM_L3_CALC 433 #define CSUM_IP_VALID CSUM_L3_VALID 434 #define CSUM_DATA_VALID CSUM_L4_VALID 435 #define CSUM_PSEUDO_HDR CSUM_L4_CALC 436 #define CSUM_SCTP_VALID CSUM_L4_VALID 437 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP) 438 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */ 439 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6) 440 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID 441 #define CSUM_TCP CSUM_IP_TCP 442 #define CSUM_UDP CSUM_IP_UDP 443 #define CSUM_SCTP CSUM_IP_SCTP 444 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO) 445 #define CSUM_UDP_IPV6 CSUM_IP6_UDP 446 #define CSUM_TCP_IPV6 CSUM_IP6_TCP 447 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP 448 449 /* 450 * mbuf types describing the content of the mbuf (including external storage). 451 */ 452 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */ 453 #define MT_DATA 1 /* dynamic (data) allocation */ 454 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */ 455 456 #define MT_VENDOR1 4 /* for vendor-internal use */ 457 #define MT_VENDOR2 5 /* for vendor-internal use */ 458 #define MT_VENDOR3 6 /* for vendor-internal use */ 459 #define MT_VENDOR4 7 /* for vendor-internal use */ 460 461 #define MT_SONAME 8 /* socket name */ 462 463 #define MT_EXP1 9 /* for experimental use */ 464 #define MT_EXP2 10 /* for experimental use */ 465 #define MT_EXP3 11 /* for experimental use */ 466 #define MT_EXP4 12 /* for experimental use */ 467 468 #define MT_CONTROL 14 /* extra-data protocol message */ 469 #define MT_OOBDATA 15 /* expedited data */ 470 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */ 471 472 #define MT_NOINIT 255 /* Not a type but a flag to allocate 473 a non-initialized mbuf */ 474 475 /* 476 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to 477 * !_KERNEL so that monitoring tools can look up the zones with 478 * libmemstat(3). 479 */ 480 #define MBUF_MEM_NAME "mbuf" 481 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster" 482 #define MBUF_PACKET_MEM_NAME "mbuf_packet" 483 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page" 484 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k" 485 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k" 486 #define MBUF_TAG_MEM_NAME "mbuf_tag" 487 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt" 488 489 #ifdef _KERNEL 490 491 #ifdef WITNESS 492 #define MBUF_CHECKSLEEP(how) do { \ 493 if (how == M_WAITOK) \ 494 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \ 495 "Sleeping in \"%s\"", __func__); \ 496 } while (0) 497 #else 498 #define MBUF_CHECKSLEEP(how) 499 #endif 500 501 /* 502 * Network buffer allocation API 503 * 504 * The rest of it is defined in kern/kern_mbuf.c 505 */ 506 extern uma_zone_t zone_mbuf; 507 extern uma_zone_t zone_clust; 508 extern uma_zone_t zone_pack; 509 extern uma_zone_t zone_jumbop; 510 extern uma_zone_t zone_jumbo9; 511 extern uma_zone_t zone_jumbo16; 512 extern uma_zone_t zone_ext_refcnt; 513 514 void mb_free_ext(struct mbuf *); 515 int m_pkthdr_init(struct mbuf *, int); 516 517 static __inline int 518 m_gettype(int size) 519 { 520 int type; 521 522 switch (size) { 523 case MSIZE: 524 type = EXT_MBUF; 525 break; 526 case MCLBYTES: 527 type = EXT_CLUSTER; 528 break; 529 #if MJUMPAGESIZE != MCLBYTES 530 case MJUMPAGESIZE: 531 type = EXT_JUMBOP; 532 break; 533 #endif 534 case MJUM9BYTES: 535 type = EXT_JUMBO9; 536 break; 537 case MJUM16BYTES: 538 type = EXT_JUMBO16; 539 break; 540 default: 541 panic("%s: invalid cluster size %d", __func__, size); 542 } 543 544 return (type); 545 } 546 547 /* 548 * Associated an external reference counted buffer with an mbuf. 549 */ 550 static __inline void 551 m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt, 552 void (*freef)(struct mbuf *, void *, void *), void *arg1, void *arg2) 553 { 554 555 KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__)); 556 557 atomic_add_int(ref_cnt, 1); 558 m->m_flags |= M_EXT; 559 m->m_ext.ext_buf = buf; 560 m->m_ext.ext_cnt = ref_cnt; 561 m->m_data = m->m_ext.ext_buf; 562 m->m_ext.ext_size = size; 563 m->m_ext.ext_free = freef; 564 m->m_ext.ext_arg1 = arg1; 565 m->m_ext.ext_arg2 = arg2; 566 m->m_ext.ext_type = EXT_EXTREF; 567 } 568 569 static __inline uma_zone_t 570 m_getzone(int size) 571 { 572 uma_zone_t zone; 573 574 switch (size) { 575 case MCLBYTES: 576 zone = zone_clust; 577 break; 578 #if MJUMPAGESIZE != MCLBYTES 579 case MJUMPAGESIZE: 580 zone = zone_jumbop; 581 break; 582 #endif 583 case MJUM9BYTES: 584 zone = zone_jumbo9; 585 break; 586 case MJUM16BYTES: 587 zone = zone_jumbo16; 588 break; 589 default: 590 panic("%s: invalid cluster size %d", __func__, size); 591 } 592 593 return (zone); 594 } 595 596 /* 597 * Initialize an mbuf with linear storage. 598 * 599 * Inline because the consumer text overhead will be roughly the same to 600 * initialize or call a function with this many parameters and M_PKTHDR 601 * should go away with constant propagation for !MGETHDR. 602 */ 603 static __inline int 604 m_init(struct mbuf *m, uma_zone_t zone, int size, int how, short type, 605 int flags) 606 { 607 int error; 608 609 m->m_next = NULL; 610 m->m_nextpkt = NULL; 611 m->m_data = m->m_dat; 612 m->m_len = 0; 613 m->m_flags = flags; 614 m->m_type = type; 615 if (flags & M_PKTHDR) { 616 if ((error = m_pkthdr_init(m, how)) != 0) 617 return (error); 618 } 619 620 return (0); 621 } 622 623 static __inline struct mbuf * 624 m_get(int how, short type) 625 { 626 struct mb_args args; 627 628 args.flags = 0; 629 args.type = type; 630 return (uma_zalloc_arg(zone_mbuf, &args, how)); 631 } 632 633 /* 634 * XXX This should be deprecated, very little use. 635 */ 636 static __inline struct mbuf * 637 m_getclr(int how, short type) 638 { 639 struct mbuf *m; 640 struct mb_args args; 641 642 args.flags = 0; 643 args.type = type; 644 m = uma_zalloc_arg(zone_mbuf, &args, how); 645 if (m != NULL) 646 bzero(m->m_data, MLEN); 647 return (m); 648 } 649 650 static __inline struct mbuf * 651 m_gethdr(int how, short type) 652 { 653 struct mb_args args; 654 655 args.flags = M_PKTHDR; 656 args.type = type; 657 return (uma_zalloc_arg(zone_mbuf, &args, how)); 658 } 659 660 static __inline struct mbuf * 661 m_getcl(int how, short type, int flags) 662 { 663 struct mb_args args; 664 665 args.flags = flags; 666 args.type = type; 667 return (uma_zalloc_arg(zone_pack, &args, how)); 668 } 669 670 static __inline void 671 m_clget(struct mbuf *m, int how) 672 { 673 674 if (m->m_flags & M_EXT) 675 printf("%s: %p mbuf already has external storage\n", __func__, m); 676 m->m_ext.ext_buf = (char *)NULL; 677 uma_zalloc_arg(zone_clust, m, how); 678 /* 679 * On a cluster allocation failure, drain the packet zone and retry, 680 * we might be able to loosen a few clusters up on the drain. 681 */ 682 if ((how & M_NOWAIT) && (m->m_ext.ext_buf == NULL)) { 683 zone_drain(zone_pack); 684 uma_zalloc_arg(zone_clust, m, how); 685 } 686 } 687 688 /* 689 * m_cljget() is different from m_clget() as it can allocate clusters without 690 * attaching them to an mbuf. In that case the return value is the pointer 691 * to the cluster of the requested size. If an mbuf was specified, it gets 692 * the cluster attached to it and the return value can be safely ignored. 693 * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES. 694 */ 695 static __inline void * 696 m_cljget(struct mbuf *m, int how, int size) 697 { 698 uma_zone_t zone; 699 700 if (m && m->m_flags & M_EXT) 701 printf("%s: %p mbuf already has external storage\n", __func__, m); 702 if (m != NULL) 703 m->m_ext.ext_buf = NULL; 704 705 zone = m_getzone(size); 706 return (uma_zalloc_arg(zone, m, how)); 707 } 708 709 static __inline void 710 m_cljset(struct mbuf *m, void *cl, int type) 711 { 712 uma_zone_t zone; 713 int size; 714 715 switch (type) { 716 case EXT_CLUSTER: 717 size = MCLBYTES; 718 zone = zone_clust; 719 break; 720 #if MJUMPAGESIZE != MCLBYTES 721 case EXT_JUMBOP: 722 size = MJUMPAGESIZE; 723 zone = zone_jumbop; 724 break; 725 #endif 726 case EXT_JUMBO9: 727 size = MJUM9BYTES; 728 zone = zone_jumbo9; 729 break; 730 case EXT_JUMBO16: 731 size = MJUM16BYTES; 732 zone = zone_jumbo16; 733 break; 734 default: 735 panic("%s: unknown cluster type %d", __func__, type); 736 break; 737 } 738 739 m->m_data = m->m_ext.ext_buf = cl; 740 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL; 741 m->m_ext.ext_size = size; 742 m->m_ext.ext_type = type; 743 m->m_ext.ext_flags = 0; 744 m->m_ext.ext_cnt = uma_find_refcnt(zone, cl); 745 m->m_flags |= M_EXT; 746 747 } 748 749 static __inline void 750 m_chtype(struct mbuf *m, short new_type) 751 { 752 753 m->m_type = new_type; 754 } 755 756 static __inline void 757 m_clrprotoflags(struct mbuf *m) 758 { 759 760 m->m_flags &= ~M_PROTOFLAGS; 761 } 762 763 static __inline struct mbuf * 764 m_last(struct mbuf *m) 765 { 766 767 while (m->m_next) 768 m = m->m_next; 769 return (m); 770 } 771 772 /* 773 * mbuf, cluster, and external object allocation macros (for compatibility 774 * purposes). 775 */ 776 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from)) 777 #define MGET(m, how, type) ((m) = m_get((how), (type))) 778 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type))) 779 #define MCLGET(m, how) m_clget((m), (how)) 780 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \ 781 (void )m_extadd((m), (caddr_t)(buf), (size), (free), (arg1), (arg2),\ 782 (flags), (type), M_NOWAIT) 783 #define m_getm(m, len, how, type) \ 784 m_getm2((m), (len), (how), (type), M_PKTHDR) 785 786 /* 787 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can 788 * be both the local data payload, or an external buffer area, depending on 789 * whether M_EXT is set). 790 */ 791 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \ 792 (!(((m)->m_flags & M_EXT)) || \ 793 (*((m)->m_ext.ext_cnt) == 1)) ) \ 794 795 /* Check if the supplied mbuf has a packet header, or else panic. */ 796 #define M_ASSERTPKTHDR(m) \ 797 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \ 798 ("%s: no mbuf packet header!", __func__)) 799 800 /* 801 * Ensure that the supplied mbuf is a valid, non-free mbuf. 802 * 803 * XXX: Broken at the moment. Need some UMA magic to make it work again. 804 */ 805 #define M_ASSERTVALID(m) \ 806 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \ 807 ("%s: attempted use of a free mbuf!", __func__)) 808 809 /* 810 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an 811 * object of the specified size at the end of the mbuf, longword aligned. 812 */ 813 #define M_ALIGN(m, len) do { \ 814 KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)), \ 815 ("%s: M_ALIGN not normal mbuf", __func__)); \ 816 KASSERT((m)->m_data == (m)->m_dat, \ 817 ("%s: M_ALIGN not a virgin mbuf", __func__)); \ 818 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 819 } while (0) 820 821 /* 822 * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by 823 * M_DUP/MOVE_PKTHDR. 824 */ 825 #define MH_ALIGN(m, len) do { \ 826 KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT), \ 827 ("%s: MH_ALIGN not PKTHDR mbuf", __func__)); \ 828 KASSERT((m)->m_data == (m)->m_pktdat, \ 829 ("%s: MH_ALIGN not a virgin mbuf", __func__)); \ 830 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 831 } while (0) 832 833 /* 834 * As above, for mbuf with external storage. 835 */ 836 #define MEXT_ALIGN(m, len) do { \ 837 KASSERT((m)->m_flags & M_EXT, \ 838 ("%s: MEXT_ALIGN not an M_EXT mbuf", __func__)); \ 839 KASSERT((m)->m_data == (m)->m_ext.ext_buf, \ 840 ("%s: MEXT_ALIGN not a virgin mbuf", __func__)); \ 841 (m)->m_data += ((m)->m_ext.ext_size - (len)) & \ 842 ~(sizeof(long) - 1); \ 843 } while (0) 844 845 /* 846 * Return the address of the start of the buffer associated with an mbuf, 847 * handling external storage, packet-header mbufs, and regular data mbufs. 848 */ 849 #define M_START(m) \ 850 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \ 851 ((m)->m_flags & M_PKTHDR) ? &(m)->m_pktdat[0] : \ 852 &(m)->m_dat[0]) 853 854 /* 855 * Return the size of the buffer associated with an mbuf, handling external 856 * storage, packet-header mbufs, and regular data mbufs. 857 */ 858 #define M_SIZE(m) \ 859 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \ 860 ((m)->m_flags & M_PKTHDR) ? MHLEN : \ 861 MLEN) 862 863 /* 864 * Compute the amount of space available before the current start of data in 865 * an mbuf. 866 * 867 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 868 * of checking writability of the mbuf data area rests solely with the caller. 869 * 870 * NB: In previous versions, M_LEADINGSPACE() would only check M_WRITABLE() 871 * for mbufs with external storage. We now allow mbuf-embedded data to be 872 * read-only as well. 873 */ 874 #define M_LEADINGSPACE(m) \ 875 (M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0) 876 877 /* 878 * Compute the amount of space available after the end of data in an mbuf. 879 * 880 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 881 * of checking writability of the mbuf data area rests solely with the caller. 882 * 883 * NB: In previous versions, M_TRAILINGSPACE() would only check M_WRITABLE() 884 * for mbufs with external storage. We now allow mbuf-embedded data to be 885 * read-only as well. 886 */ 887 #define M_TRAILINGSPACE(m) \ 888 (M_WRITABLE(m) ? \ 889 ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len)) : 0) 890 891 /* 892 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be 893 * allocated, how specifies whether to wait. If the allocation fails, the 894 * original mbuf chain is freed and m is set to NULL. 895 */ 896 #define M_PREPEND(m, plen, how) do { \ 897 struct mbuf **_mmp = &(m); \ 898 struct mbuf *_mm = *_mmp; \ 899 int _mplen = (plen); \ 900 int __mhow = (how); \ 901 \ 902 MBUF_CHECKSLEEP(how); \ 903 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 904 _mm->m_data -= _mplen; \ 905 _mm->m_len += _mplen; \ 906 } else \ 907 _mm = m_prepend(_mm, _mplen, __mhow); \ 908 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ 909 _mm->m_pkthdr.len += _mplen; \ 910 *_mmp = _mm; \ 911 } while (0) 912 913 /* 914 * Change mbuf to new type. This is a relatively expensive operation and 915 * should be avoided. 916 */ 917 #define MCHTYPE(m, t) m_chtype((m), (t)) 918 919 /* Length to m_copy to copy all. */ 920 #define M_COPYALL 1000000000 921 922 /* Compatibility with 4.3. */ 923 #define m_copy(m, o, l) m_copym((m), (o), (l), M_NOWAIT) 924 925 extern int max_datalen; /* MHLEN - max_hdr */ 926 extern int max_hdr; /* Largest link + protocol header */ 927 extern int max_linkhdr; /* Largest link-level header */ 928 extern int max_protohdr; /* Largest protocol header */ 929 extern int nmbclusters; /* Maximum number of clusters */ 930 931 struct uio; 932 933 void m_adj(struct mbuf *, int); 934 void m_align(struct mbuf *, int); 935 int m_apply(struct mbuf *, int, int, 936 int (*)(void *, void *, u_int), void *); 937 int m_append(struct mbuf *, int, c_caddr_t); 938 void m_cat(struct mbuf *, struct mbuf *); 939 void m_catpkt(struct mbuf *, struct mbuf *); 940 int m_extadd(struct mbuf *, caddr_t, u_int, 941 void (*)(struct mbuf *, void *, void *), void *, void *, 942 int, int, int); 943 struct mbuf *m_collapse(struct mbuf *, int, int); 944 void m_copyback(struct mbuf *, int, int, c_caddr_t); 945 void m_copydata(const struct mbuf *, int, int, caddr_t); 946 struct mbuf *m_copym(struct mbuf *, int, int, int); 947 struct mbuf *m_copymdata(struct mbuf *, struct mbuf *, 948 int, int, int, int); 949 struct mbuf *m_copypacket(struct mbuf *, int); 950 void m_copy_pkthdr(struct mbuf *, struct mbuf *); 951 struct mbuf *m_copyup(struct mbuf *, int, int); 952 struct mbuf *m_defrag(struct mbuf *, int); 953 void m_demote(struct mbuf *, int); 954 struct mbuf *m_devget(char *, int, int, struct ifnet *, 955 void (*)(char *, caddr_t, u_int)); 956 struct mbuf *m_dup(struct mbuf *, int); 957 int m_dup_pkthdr(struct mbuf *, struct mbuf *, int); 958 u_int m_fixhdr(struct mbuf *); 959 struct mbuf *m_fragment(struct mbuf *, int, int); 960 void m_freem(struct mbuf *); 961 struct mbuf *m_get2(int, int, short, int); 962 struct mbuf *m_getjcl(int, short, int, int); 963 struct mbuf *m_getm2(struct mbuf *, int, int, short, int); 964 struct mbuf *m_getptr(struct mbuf *, int, int *); 965 u_int m_length(struct mbuf *, struct mbuf **); 966 int m_mbuftouio(struct uio *, struct mbuf *, int); 967 void m_move_pkthdr(struct mbuf *, struct mbuf *); 968 struct mbuf *m_prepend(struct mbuf *, int, int); 969 void m_print(const struct mbuf *, int); 970 struct mbuf *m_pulldown(struct mbuf *, int, int, int *); 971 struct mbuf *m_pullup(struct mbuf *, int); 972 int m_sanity(struct mbuf *, int); 973 struct mbuf *m_split(struct mbuf *, int, int); 974 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int); 975 struct mbuf *m_unshare(struct mbuf *, int); 976 977 /*- 978 * Network packets may have annotations attached by affixing a list of 979 * "packet tags" to the pkthdr structure. Packet tags are dynamically 980 * allocated semi-opaque data structures that have a fixed header 981 * (struct m_tag) that specifies the size of the memory block and a 982 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique 983 * unsigned value used to identify a module or ABI. By convention this value 984 * is chosen as the date+time that the module is created, expressed as the 985 * number of seconds since the epoch (e.g., using date -u +'%s'). The type 986 * value is an ABI/module-specific value that identifies a particular 987 * annotation and is private to the module. For compatibility with systems 988 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value 989 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find 990 * compatibility shim functions and several tag types are defined below. 991 * Users that do not require compatibility should use a private cookie value 992 * so that packet tag-related definitions can be maintained privately. 993 * 994 * Note that the packet tag returned by m_tag_alloc has the default memory 995 * alignment implemented by malloc. To reference private data one can use a 996 * construct like: 997 * 998 * struct m_tag *mtag = m_tag_alloc(...); 999 * struct foo *p = (struct foo *)(mtag+1); 1000 * 1001 * if the alignment of struct m_tag is sufficient for referencing members of 1002 * struct foo. Otherwise it is necessary to embed struct m_tag within the 1003 * private data structure to insure proper alignment; e.g., 1004 * 1005 * struct foo { 1006 * struct m_tag tag; 1007 * ... 1008 * }; 1009 * struct foo *p = (struct foo *) m_tag_alloc(...); 1010 * struct m_tag *mtag = &p->tag; 1011 */ 1012 1013 /* 1014 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise 1015 * tags are expected to ``vanish'' when they pass through a network 1016 * interface. For most interfaces this happens normally as the tags are 1017 * reclaimed when the mbuf is free'd. However in some special cases 1018 * reclaiming must be done manually. An example is packets that pass through 1019 * the loopback interface. Also, one must be careful to do this when 1020 * ``turning around'' packets (e.g., icmp_reflect). 1021 * 1022 * To mark a tag persistent bit-or this flag in when defining the tag id. 1023 * The tag will then be treated as described above. 1024 */ 1025 #define MTAG_PERSISTENT 0x800 1026 1027 #define PACKET_TAG_NONE 0 /* Nadda */ 1028 1029 /* Packet tags for use with PACKET_ABI_COMPAT. */ 1030 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */ 1031 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */ 1032 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */ 1033 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */ 1034 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */ 1035 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */ 1036 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */ 1037 #define PACKET_TAG_GIF 8 /* GIF processing done */ 1038 #define PACKET_TAG_GRE 9 /* GRE processing done */ 1039 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */ 1040 #define PACKET_TAG_ENCAP 11 /* Encap. processing */ 1041 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */ 1042 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */ 1043 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */ 1044 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */ 1045 #define PACKET_TAG_DIVERT 17 /* divert info */ 1046 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */ 1047 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */ 1048 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */ 1049 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */ 1050 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */ 1051 #define PACKET_TAG_CARP 28 /* CARP info */ 1052 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */ 1053 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */ 1054 1055 /* Specific cookies and tags. */ 1056 1057 /* Packet tag routines. */ 1058 struct m_tag *m_tag_alloc(u_int32_t, int, int, int); 1059 void m_tag_delete(struct mbuf *, struct m_tag *); 1060 void m_tag_delete_chain(struct mbuf *, struct m_tag *); 1061 void m_tag_free_default(struct m_tag *); 1062 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *); 1063 struct m_tag *m_tag_copy(struct m_tag *, int); 1064 int m_tag_copy_chain(struct mbuf *, struct mbuf *, int); 1065 void m_tag_delete_nonpersistent(struct mbuf *); 1066 1067 /* 1068 * Initialize the list of tags associated with an mbuf. 1069 */ 1070 static __inline void 1071 m_tag_init(struct mbuf *m) 1072 { 1073 1074 SLIST_INIT(&m->m_pkthdr.tags); 1075 } 1076 1077 /* 1078 * Set up the contents of a tag. Note that this does not fill in the free 1079 * method; the caller is expected to do that. 1080 * 1081 * XXX probably should be called m_tag_init, but that was already taken. 1082 */ 1083 static __inline void 1084 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len) 1085 { 1086 1087 t->m_tag_id = type; 1088 t->m_tag_len = len; 1089 t->m_tag_cookie = cookie; 1090 } 1091 1092 /* 1093 * Reclaim resources associated with a tag. 1094 */ 1095 static __inline void 1096 m_tag_free(struct m_tag *t) 1097 { 1098 1099 (*t->m_tag_free)(t); 1100 } 1101 1102 /* 1103 * Return the first tag associated with an mbuf. 1104 */ 1105 static __inline struct m_tag * 1106 m_tag_first(struct mbuf *m) 1107 { 1108 1109 return (SLIST_FIRST(&m->m_pkthdr.tags)); 1110 } 1111 1112 /* 1113 * Return the next tag in the list of tags associated with an mbuf. 1114 */ 1115 static __inline struct m_tag * 1116 m_tag_next(struct mbuf *m, struct m_tag *t) 1117 { 1118 1119 return (SLIST_NEXT(t, m_tag_link)); 1120 } 1121 1122 /* 1123 * Prepend a tag to the list of tags associated with an mbuf. 1124 */ 1125 static __inline void 1126 m_tag_prepend(struct mbuf *m, struct m_tag *t) 1127 { 1128 1129 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link); 1130 } 1131 1132 /* 1133 * Unlink a tag from the list of tags associated with an mbuf. 1134 */ 1135 static __inline void 1136 m_tag_unlink(struct mbuf *m, struct m_tag *t) 1137 { 1138 1139 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link); 1140 } 1141 1142 /* These are for OpenBSD compatibility. */ 1143 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */ 1144 1145 static __inline struct m_tag * 1146 m_tag_get(int type, int length, int wait) 1147 { 1148 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait)); 1149 } 1150 1151 static __inline struct m_tag * 1152 m_tag_find(struct mbuf *m, int type, struct m_tag *start) 1153 { 1154 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL : 1155 m_tag_locate(m, MTAG_ABI_COMPAT, type, start)); 1156 } 1157 1158 static __inline struct mbuf * 1159 m_free(struct mbuf *m) 1160 { 1161 struct mbuf *n = m->m_next; 1162 1163 if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE)) 1164 m_tag_delete_chain(m, NULL); 1165 if (m->m_flags & M_EXT) 1166 mb_free_ext(m); 1167 else if ((m->m_flags & M_NOFREE) == 0) 1168 uma_zfree(zone_mbuf, m); 1169 return (n); 1170 } 1171 1172 static int inline 1173 rt_m_getfib(struct mbuf *m) 1174 { 1175 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf.")); 1176 return (m->m_pkthdr.fibnum); 1177 } 1178 1179 #define M_GETFIB(_m) rt_m_getfib(_m) 1180 1181 #define M_SETFIB(_m, _fib) do { \ 1182 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \ 1183 ((_m)->m_pkthdr.fibnum) = (_fib); \ 1184 } while (0) 1185 1186 #endif /* _KERNEL */ 1187 1188 #ifdef MBUF_PROFILING 1189 void m_profile(struct mbuf *m); 1190 #define M_PROFILE(m) m_profile(m) 1191 #else 1192 #define M_PROFILE(m) 1193 #endif 1194 1195 1196 #endif /* !_SYS_MBUF_H_ */ 1197