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7 * modification, are permitted provided that the following conditions
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * @(#)mbuf.h 8.5 (Berkeley) 2/19/95
37 /* XXX: These includes suck. Sorry! */
38 #include <sys/queue.h>
40 #include <sys/systm.h>
50 #define MBUF_PROBE1(probe, arg0) \
51 SDT_PROBE1(sdt, , , probe, arg0)
52 #define MBUF_PROBE2(probe, arg0, arg1) \
53 SDT_PROBE2(sdt, , , probe, arg0, arg1)
54 #define MBUF_PROBE3(probe, arg0, arg1, arg2) \
55 SDT_PROBE3(sdt, , , probe, arg0, arg1, arg2)
56 #define MBUF_PROBE4(probe, arg0, arg1, arg2, arg3) \
57 SDT_PROBE4(sdt, , , probe, arg0, arg1, arg2, arg3)
58 #define MBUF_PROBE5(probe, arg0, arg1, arg2, arg3, arg4) \
59 SDT_PROBE5(sdt, , , probe, arg0, arg1, arg2, arg3, arg4)
61 SDT_PROBE_DECLARE(sdt, , , m__init);
62 SDT_PROBE_DECLARE(sdt, , , m__gethdr);
63 SDT_PROBE_DECLARE(sdt, , , m__get);
64 SDT_PROBE_DECLARE(sdt, , , m__getcl);
65 SDT_PROBE_DECLARE(sdt, , , m__clget);
66 SDT_PROBE_DECLARE(sdt, , , m__cljget);
67 SDT_PROBE_DECLARE(sdt, , , m__cljset);
68 SDT_PROBE_DECLARE(sdt, , , m__free);
69 SDT_PROBE_DECLARE(sdt, , , m__freem);
74 * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead.
75 * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in
76 * sys/param.h), which has no additional overhead and is used instead of the
77 * internal data area; this is done when at least MINCLSIZE of data must be
78 * stored. Additionally, it is possible to allocate a separate buffer
79 * externally and attach it to the mbuf in a way similar to that of mbuf
82 * NB: These calculation do not take actual compiler-induced alignment and
83 * padding inside the complete struct mbuf into account. Appropriate
84 * attention is required when changing members of struct mbuf.
86 * MLEN is data length in a normal mbuf.
87 * MHLEN is data length in an mbuf with pktheader.
88 * MINCLSIZE is a smallest amount of data that should be put into cluster.
90 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
94 #define MHSIZE offsetof(struct mbuf, m_dat)
95 #define MPKTHSIZE offsetof(struct mbuf, m_pktdat)
96 #define MLEN ((int)(MSIZE - MHSIZE))
97 #define MHLEN ((int)(MSIZE - MPKTHSIZE))
98 #define MINCLSIZE (MHLEN + 1)
102 * Macro for type conversion: convert mbuf pointer to data pointer of correct
105 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
106 * mtodo(m, o) -- Same as above but with offset 'o' into data.
108 #define mtod(m, t) ((t)((m)->m_data))
109 #define mtodo(m, o) ((void *)(((m)->m_data) + (o)))
112 * Argument structure passed to UMA routines during mbuf and packet
116 int flags; /* Flags for mbuf being allocated */
117 short type; /* Type of mbuf being allocated */
122 * Packet tag structure (see below for details).
125 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
126 u_int16_t m_tag_id; /* Tag ID */
127 u_int16_t m_tag_len; /* Length of data */
128 u_int32_t m_tag_cookie; /* ABI/Module ID */
129 void (*m_tag_free)(struct m_tag *);
133 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
136 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
140 struct ifnet *rcvif; /* rcv interface */
141 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
142 int32_t len; /* total packet length */
144 /* Layer crossing persistent information. */
145 uint32_t flowid; /* packet's 4-tuple system */
146 uint64_t csum_flags; /* checksum and offload features */
147 uint16_t fibnum; /* this packet should use this fib */
148 uint8_t cosqos; /* class/quality of service */
149 uint8_t rsstype; /* hash type */
150 uint8_t l2hlen; /* layer 2 header length */
151 uint8_t l3hlen; /* layer 3 header length */
152 uint8_t l4hlen; /* layer 4 header length */
153 uint8_t l5hlen; /* layer 5 header length */
157 uint32_t thirtytwo[2];
158 uint64_t sixtyfour[1];
159 uintptr_t unintptr[1];
163 /* Layer specific non-persistent local storage for reassembly, etc. */
167 uint32_t thirtytwo[2];
168 uint64_t sixtyfour[1];
169 uintptr_t unintptr[1];
173 #define ether_vtag PH_per.sixteen[0]
175 #define vt_nrecs sixteen[0]
176 #define tso_segsz PH_per.sixteen[1]
177 #define csum_phsum PH_per.sixteen[2]
178 #define csum_data PH_per.thirtytwo[1]
181 * Description of external storage mapped into mbuf; valid only if M_EXT is
185 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
190 volatile u_int ext_count; /* value of ref count info */
191 volatile u_int *ext_cnt; /* pointer to ref count info */
193 caddr_t ext_buf; /* start of buffer */
194 uint32_t ext_size; /* size of buffer, for ext_free */
195 uint32_t ext_type:8, /* type of external storage */
196 ext_flags:24; /* external storage mbuf flags */
197 void (*ext_free) /* free routine if not the usual */
198 (struct mbuf *, void *, void *);
199 void *ext_arg1; /* optional argument pointer */
200 void *ext_arg2; /* optional argument pointer */
204 * The core of the mbuf object along with some shortcut defines for practical
209 * Header present at the beginning of every mbuf.
212 * Compile-time assertions in uipc_mbuf.c test these values to ensure
213 * that they are correct.
215 union { /* next buffer in chain */
217 SLIST_ENTRY(mbuf) m_slist;
218 STAILQ_ENTRY(mbuf) m_stailq;
220 union { /* next chain in queue/record */
221 struct mbuf *m_nextpkt;
222 SLIST_ENTRY(mbuf) m_slistpkt;
223 STAILQ_ENTRY(mbuf) m_stailqpkt;
225 caddr_t m_data; /* location of data */
226 int32_t m_len; /* amount of data in this mbuf */
227 uint32_t m_type:8, /* type of data in this mbuf */
228 m_flags:24; /* flags; see below */
229 #if !defined(__LP64__)
230 uint32_t m_pad; /* pad for 64bit alignment */
234 * A set of optional headers (packet header, external storage header)
235 * and internal data storage. Historically, these arrays were sized
236 * to MHLEN (space left after a packet header) and MLEN (space left
237 * after only a regular mbuf header); they are now variable size in
238 * order to support future work on variable-size mbufs.
242 struct pkthdr m_pkthdr; /* M_PKTHDR set */
244 struct m_ext m_ext; /* M_EXT set */
248 char m_dat[0]; /* !M_PKTHDR, !M_EXT */
253 * mbuf flags of global significance and layer crossing.
254 * Those of only protocol/layer specific significance are to be mapped
255 * to M_PROTO[1-12] and cleared at layer handoff boundaries.
256 * NB: Limited to the lower 24 bits.
258 #define M_EXT 0x00000001 /* has associated external storage */
259 #define M_PKTHDR 0x00000002 /* start of record */
260 #define M_EOR 0x00000004 /* end of record */
261 #define M_RDONLY 0x00000008 /* associated data is marked read-only */
262 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */
263 #define M_MCAST 0x00000020 /* send/received as link-level multicast */
264 #define M_PROMISC 0x00000040 /* packet was not for us */
265 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */
266 #define M_UNUSED_8 0x00000100 /* --available-- */
267 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */
269 #define M_PROTO1 0x00001000 /* protocol-specific */
270 #define M_PROTO2 0x00002000 /* protocol-specific */
271 #define M_PROTO3 0x00004000 /* protocol-specific */
272 #define M_PROTO4 0x00008000 /* protocol-specific */
273 #define M_PROTO5 0x00010000 /* protocol-specific */
274 #define M_PROTO6 0x00020000 /* protocol-specific */
275 #define M_PROTO7 0x00040000 /* protocol-specific */
276 #define M_PROTO8 0x00080000 /* protocol-specific */
277 #define M_PROTO9 0x00100000 /* protocol-specific */
278 #define M_PROTO10 0x00200000 /* protocol-specific */
279 #define M_PROTO11 0x00400000 /* protocol-specific */
280 #define M_PROTO12 0x00800000 /* protocol-specific */
282 #define MB_DTOR_SKIP 0x1 /* don't pollute the cache by touching a freed mbuf */
285 * Flags to purge when crossing layers.
287 #define M_PROTOFLAGS \
288 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\
289 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12)
292 * Flags preserved when copying m_pkthdr.
294 #define M_COPYFLAGS \
295 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG| \
299 * Mbuf flag description for use with printf(9) %b identifier.
301 #define M_FLAG_BITS \
302 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \
303 "\7M_PROMISC\10M_VLANTAG"
304 #define M_FLAG_PROTOBITS \
305 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \
306 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \
307 "\27M_PROTO11\30M_PROTO12"
308 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS)
311 * Network interface cards are able to hash protocol fields (such as IPv4
312 * addresses and TCP port numbers) classify packets into flows. These flows
313 * can then be used to maintain ordering while delivering packets to the OS
314 * via parallel input queues, as well as to provide a stateless affinity
315 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set
316 * m_flag fields to indicate how the hash should be interpreted by the
319 * Most NICs support RSS, which provides ordering and explicit affinity, and
320 * use the hash m_flag bits to indicate what header fields were covered by
321 * the hash. M_HASHTYPE_OPAQUE and M_HASHTYPE_OPAQUE_HASH can be set by non-
322 * RSS cards or configurations that provide an opaque flow identifier, allowing
323 * for ordering and distribution without explicit affinity. Additionally,
324 * M_HASHTYPE_OPAQUE_HASH indicates that the flow identifier has hash
327 #define M_HASHTYPE_HASHPROP 0x80 /* has hash properties */
328 #define M_HASHTYPE_HASH(t) (M_HASHTYPE_HASHPROP | (t))
329 /* Microsoft RSS standard hash types */
330 #define M_HASHTYPE_NONE 0
331 #define M_HASHTYPE_RSS_IPV4 M_HASHTYPE_HASH(1) /* IPv4 2-tuple */
332 #define M_HASHTYPE_RSS_TCP_IPV4 M_HASHTYPE_HASH(2) /* TCPv4 4-tuple */
333 #define M_HASHTYPE_RSS_IPV6 M_HASHTYPE_HASH(3) /* IPv6 2-tuple */
334 #define M_HASHTYPE_RSS_TCP_IPV6 M_HASHTYPE_HASH(4) /* TCPv6 4-tuple */
335 #define M_HASHTYPE_RSS_IPV6_EX M_HASHTYPE_HASH(5) /* IPv6 2-tuple +
337 #define M_HASHTYPE_RSS_TCP_IPV6_EX M_HASHTYPE_HASH(6) /* TCPv6 4-tiple +
339 /* Non-standard RSS hash types */
340 #define M_HASHTYPE_RSS_UDP_IPV4 M_HASHTYPE_HASH(7) /* IPv4 UDP 4-tuple*/
341 #define M_HASHTYPE_RSS_UDP_IPV4_EX M_HASHTYPE_HASH(8) /* IPv4 UDP 4-tuple +
343 #define M_HASHTYPE_RSS_UDP_IPV6 M_HASHTYPE_HASH(9) /* IPv6 UDP 4-tuple*/
344 #define M_HASHTYPE_RSS_UDP_IPV6_EX M_HASHTYPE_HASH(10)/* IPv6 UDP 4-tuple +
347 #define M_HASHTYPE_OPAQUE 63 /* ordering, not affinity */
348 #define M_HASHTYPE_OPAQUE_HASH M_HASHTYPE_HASH(M_HASHTYPE_OPAQUE)
349 /* ordering+hash, not affinity*/
351 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0)
352 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype)
353 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v))
354 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v))
355 #define M_HASHTYPE_ISHASH(m) (M_HASHTYPE_GET(m) & M_HASHTYPE_HASHPROP)
358 * COS/QOS class and quality of service tags.
359 * It uses DSCP code points as base.
361 #define QOS_DSCP_CS0 0x00
362 #define QOS_DSCP_DEF QOS_DSCP_CS0
363 #define QOS_DSCP_CS1 0x20
364 #define QOS_DSCP_AF11 0x28
365 #define QOS_DSCP_AF12 0x30
366 #define QOS_DSCP_AF13 0x38
367 #define QOS_DSCP_CS2 0x40
368 #define QOS_DSCP_AF21 0x48
369 #define QOS_DSCP_AF22 0x50
370 #define QOS_DSCP_AF23 0x58
371 #define QOS_DSCP_CS3 0x60
372 #define QOS_DSCP_AF31 0x68
373 #define QOS_DSCP_AF32 0x70
374 #define QOS_DSCP_AF33 0x78
375 #define QOS_DSCP_CS4 0x80
376 #define QOS_DSCP_AF41 0x88
377 #define QOS_DSCP_AF42 0x90
378 #define QOS_DSCP_AF43 0x98
379 #define QOS_DSCP_CS5 0xa0
380 #define QOS_DSCP_EF 0xb8
381 #define QOS_DSCP_CS6 0xc0
382 #define QOS_DSCP_CS7 0xe0
385 * External mbuf storage buffer types.
387 #define EXT_CLUSTER 1 /* mbuf cluster */
388 #define EXT_SFBUF 2 /* sendfile(2)'s sf_buf */
389 #define EXT_JUMBOP 3 /* jumbo cluster page sized */
390 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */
391 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
392 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */
393 #define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */
394 #define EXT_SFBUF_NOCACHE 8 /* sendfile(2)'s sf_buf not to be cached */
396 #define EXT_VENDOR1 224 /* for vendor-internal use */
397 #define EXT_VENDOR2 225 /* for vendor-internal use */
398 #define EXT_VENDOR3 226 /* for vendor-internal use */
399 #define EXT_VENDOR4 227 /* for vendor-internal use */
401 #define EXT_EXP1 244 /* for experimental use */
402 #define EXT_EXP2 245 /* for experimental use */
403 #define EXT_EXP3 246 /* for experimental use */
404 #define EXT_EXP4 247 /* for experimental use */
406 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */
407 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */
408 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */
409 #define EXT_EXTREF 255 /* has externally maintained ext_cnt ptr */
412 * Flags for external mbuf buffer types.
413 * NB: limited to the lower 24 bits.
415 #define EXT_FLAG_EMBREF 0x000001 /* embedded ext_count */
416 #define EXT_FLAG_EXTREF 0x000002 /* external ext_cnt, notyet */
418 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */
420 #define EXT_FLAG_VENDOR1 0x010000 /* for vendor-internal use */
421 #define EXT_FLAG_VENDOR2 0x020000 /* for vendor-internal use */
422 #define EXT_FLAG_VENDOR3 0x040000 /* for vendor-internal use */
423 #define EXT_FLAG_VENDOR4 0x080000 /* for vendor-internal use */
425 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */
426 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */
427 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */
428 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */
431 * EXT flag description for use with printf(9) %b identifier.
433 #define EXT_FLAG_BITS \
434 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \
435 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \
436 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \
440 * External reference/free functions.
442 void sf_ext_free(void *, void *);
443 void sf_ext_free_nocache(void *, void *);
446 * Flags indicating checksum, segmentation and other offload work to be
447 * done, or already done, by hardware or lower layers. It is split into
448 * separate inbound and outbound flags.
450 * Outbound flags that are set by upper protocol layers requesting lower
451 * layers, or ideally the hardware, to perform these offloading tasks.
452 * For outbound packets this field and its flags can be directly tested
453 * against ifnet if_hwassist.
455 #define CSUM_IP 0x00000001 /* IP header checksum offload */
456 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */
457 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */
458 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */
459 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */
460 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */
462 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */
463 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */
464 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */
465 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */
466 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */
468 /* Inbound checksum support where the checksum was verified by hardware. */
469 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */
470 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */
471 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */
472 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */
473 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */
474 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */
475 #define CSUM_COALESED 0x40000000 /* contains merged segments */
478 * CSUM flag description for use with printf(9) %b identifier.
481 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \
483 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \
484 "\16CSUM_IP6_ISCSI" \
485 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \
486 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESED"
488 /* CSUM flags compatibility mappings. */
489 #define CSUM_IP_CHECKED CSUM_L3_CALC
490 #define CSUM_IP_VALID CSUM_L3_VALID
491 #define CSUM_DATA_VALID CSUM_L4_VALID
492 #define CSUM_PSEUDO_HDR CSUM_L4_CALC
493 #define CSUM_SCTP_VALID CSUM_L4_VALID
494 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP)
495 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */
496 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6)
497 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID
498 #define CSUM_TCP CSUM_IP_TCP
499 #define CSUM_UDP CSUM_IP_UDP
500 #define CSUM_SCTP CSUM_IP_SCTP
501 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO)
502 #define CSUM_UDP_IPV6 CSUM_IP6_UDP
503 #define CSUM_TCP_IPV6 CSUM_IP6_TCP
504 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP
507 * mbuf types describing the content of the mbuf (including external storage).
509 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
510 #define MT_DATA 1 /* dynamic (data) allocation */
511 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */
513 #define MT_VENDOR1 4 /* for vendor-internal use */
514 #define MT_VENDOR2 5 /* for vendor-internal use */
515 #define MT_VENDOR3 6 /* for vendor-internal use */
516 #define MT_VENDOR4 7 /* for vendor-internal use */
518 #define MT_SONAME 8 /* socket name */
520 #define MT_EXP1 9 /* for experimental use */
521 #define MT_EXP2 10 /* for experimental use */
522 #define MT_EXP3 11 /* for experimental use */
523 #define MT_EXP4 12 /* for experimental use */
525 #define MT_CONTROL 14 /* extra-data protocol message */
526 #define MT_OOBDATA 15 /* expedited data */
527 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
529 #define MT_NOINIT 255 /* Not a type but a flag to allocate
530 a non-initialized mbuf */
533 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to
534 * !_KERNEL so that monitoring tools can look up the zones with
537 #define MBUF_MEM_NAME "mbuf"
538 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster"
539 #define MBUF_PACKET_MEM_NAME "mbuf_packet"
540 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page"
541 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k"
542 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k"
543 #define MBUF_TAG_MEM_NAME "mbuf_tag"
544 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
549 #define MBUF_CHECKSLEEP(how) do { \
550 if (how == M_WAITOK) \
551 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \
552 "Sleeping in \"%s\"", __func__); \
555 #define MBUF_CHECKSLEEP(how)
559 * Network buffer allocation API
561 * The rest of it is defined in kern/kern_mbuf.c
563 extern uma_zone_t zone_mbuf;
564 extern uma_zone_t zone_clust;
565 extern uma_zone_t zone_pack;
566 extern uma_zone_t zone_jumbop;
567 extern uma_zone_t zone_jumbo9;
568 extern uma_zone_t zone_jumbo16;
570 void mb_dupcl(struct mbuf *, struct mbuf *);
571 void mb_free_ext(struct mbuf *);
572 void m_adj(struct mbuf *, int);
573 int m_apply(struct mbuf *, int, int,
574 int (*)(void *, void *, u_int), void *);
575 int m_append(struct mbuf *, int, c_caddr_t);
576 void m_cat(struct mbuf *, struct mbuf *);
577 void m_catpkt(struct mbuf *, struct mbuf *);
578 int m_clget(struct mbuf *m, int how);
579 void *m_cljget(struct mbuf *m, int how, int size);
580 struct mbuf *m_collapse(struct mbuf *, int, int);
581 void m_copyback(struct mbuf *, int, int, c_caddr_t);
582 void m_copydata(const struct mbuf *, int, int, caddr_t);
583 struct mbuf *m_copym(struct mbuf *, int, int, int);
584 struct mbuf *m_copypacket(struct mbuf *, int);
585 void m_copy_pkthdr(struct mbuf *, struct mbuf *);
586 struct mbuf *m_copyup(struct mbuf *, int, int);
587 struct mbuf *m_defrag(struct mbuf *, int);
588 void m_demote_pkthdr(struct mbuf *);
589 void m_demote(struct mbuf *, int, int);
590 struct mbuf *m_devget(char *, int, int, struct ifnet *,
591 void (*)(char *, caddr_t, u_int));
592 struct mbuf *m_dup(const struct mbuf *, int);
593 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
594 void m_extadd(struct mbuf *, caddr_t, u_int,
595 void (*)(struct mbuf *, void *, void *), void *, void *,
597 u_int m_fixhdr(struct mbuf *);
598 struct mbuf *m_fragment(struct mbuf *, int, int);
599 void m_freem(struct mbuf *);
600 struct mbuf *m_get2(int, int, short, int);
601 struct mbuf *m_getjcl(int, short, int, int);
602 struct mbuf *m_getm2(struct mbuf *, int, int, short, int);
603 struct mbuf *m_getptr(struct mbuf *, int, int *);
604 u_int m_length(struct mbuf *, struct mbuf **);
605 int m_mbuftouio(struct uio *, struct mbuf *, int);
606 void m_move_pkthdr(struct mbuf *, struct mbuf *);
607 int m_pkthdr_init(struct mbuf *, int);
608 struct mbuf *m_prepend(struct mbuf *, int, int);
609 void m_print(const struct mbuf *, int);
610 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
611 struct mbuf *m_pullup(struct mbuf *, int);
612 int m_sanity(struct mbuf *, int);
613 struct mbuf *m_split(struct mbuf *, int, int);
614 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int);
615 struct mbuf *m_unshare(struct mbuf *, int);
629 #if MJUMPAGESIZE != MCLBYTES
641 panic("%s: invalid cluster size %d", __func__, size);
648 * Associated an external reference counted buffer with an mbuf.
651 m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt,
652 void (*freef)(struct mbuf *, void *, void *), void *arg1, void *arg2)
655 KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__));
657 atomic_add_int(ref_cnt, 1);
659 m->m_ext.ext_buf = buf;
660 m->m_ext.ext_cnt = ref_cnt;
661 m->m_data = m->m_ext.ext_buf;
662 m->m_ext.ext_size = size;
663 m->m_ext.ext_free = freef;
664 m->m_ext.ext_arg1 = arg1;
665 m->m_ext.ext_arg2 = arg2;
666 m->m_ext.ext_type = EXT_EXTREF;
667 m->m_ext.ext_flags = 0;
670 static __inline uma_zone_t
679 #if MJUMPAGESIZE != MCLBYTES
691 panic("%s: invalid cluster size %d", __func__, size);
698 * Initialize an mbuf with linear storage.
700 * Inline because the consumer text overhead will be roughly the same to
701 * initialize or call a function with this many parameters and M_PKTHDR
702 * should go away with constant propagation for !MGETHDR.
705 m_init(struct mbuf *m, int how, short type, int flags)
711 m->m_data = m->m_dat;
715 if (flags & M_PKTHDR)
716 error = m_pkthdr_init(m, how);
720 MBUF_PROBE5(m__init, m, how, type, flags, error);
724 static __inline struct mbuf *
725 m_get(int how, short type)
732 m = uma_zalloc_arg(zone_mbuf, &args, how);
733 MBUF_PROBE3(m__get, how, type, m);
737 static __inline struct mbuf *
738 m_gethdr(int how, short type)
743 args.flags = M_PKTHDR;
745 m = uma_zalloc_arg(zone_mbuf, &args, how);
746 MBUF_PROBE3(m__gethdr, how, type, m);
750 static __inline struct mbuf *
751 m_getcl(int how, short type, int flags)
758 m = uma_zalloc_arg(zone_pack, &args, how);
759 MBUF_PROBE4(m__getcl, how, type, flags, m);
764 * XXX: m_cljset() is a dangerous API. One must attach only a new,
765 * unreferenced cluster to an mbuf(9). It is not possible to assert
766 * that, so care can be taken only by users of the API.
769 m_cljset(struct mbuf *m, void *cl, int type)
777 #if MJUMPAGESIZE != MCLBYTES
789 panic("%s: unknown cluster type %d", __func__, type);
793 m->m_data = m->m_ext.ext_buf = cl;
794 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
795 m->m_ext.ext_size = size;
796 m->m_ext.ext_type = type;
797 m->m_ext.ext_flags = EXT_FLAG_EMBREF;
798 m->m_ext.ext_count = 1;
800 MBUF_PROBE3(m__cljset, m, cl, type);
804 m_chtype(struct mbuf *m, short new_type)
807 m->m_type = new_type;
811 m_clrprotoflags(struct mbuf *m)
815 m->m_flags &= ~M_PROTOFLAGS;
820 static __inline struct mbuf *
821 m_last(struct mbuf *m)
830 m_extrefcnt(struct mbuf *m)
833 KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing", __func__));
835 return ((m->m_ext.ext_flags & EXT_FLAG_EMBREF) ? m->m_ext.ext_count :
840 * mbuf, cluster, and external object allocation macros (for compatibility
843 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
844 #define MGET(m, how, type) ((m) = m_get((how), (type)))
845 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type)))
846 #define MCLGET(m, how) m_clget((m), (how))
847 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \
848 m_extadd((m), (caddr_t)(buf), (size), (free), (arg1), (arg2), \
850 #define m_getm(m, len, how, type) \
851 m_getm2((m), (len), (how), (type), M_PKTHDR)
854 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
855 * be both the local data payload, or an external buffer area, depending on
856 * whether M_EXT is set).
858 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \
859 (!(((m)->m_flags & M_EXT)) || \
860 (m_extrefcnt(m) == 1)))
862 /* Check if the supplied mbuf has a packet header, or else panic. */
863 #define M_ASSERTPKTHDR(m) \
864 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \
865 ("%s: no mbuf packet header!", __func__))
868 * Ensure that the supplied mbuf is a valid, non-free mbuf.
870 * XXX: Broken at the moment. Need some UMA magic to make it work again.
872 #define M_ASSERTVALID(m) \
873 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \
874 ("%s: attempted use of a free mbuf!", __func__))
877 * Return the address of the start of the buffer associated with an mbuf,
878 * handling external storage, packet-header mbufs, and regular data mbufs.
881 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \
882 ((m)->m_flags & M_PKTHDR) ? &(m)->m_pktdat[0] : \
886 * Return the size of the buffer associated with an mbuf, handling external
887 * storage, packet-header mbufs, and regular data mbufs.
890 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \
891 ((m)->m_flags & M_PKTHDR) ? MHLEN : \
895 * Set the m_data pointer of a newly allocated mbuf to place an object of the
896 * specified size at the end of the mbuf, longword aligned.
898 * NB: Historically, we had M_ALIGN(), MH_ALIGN(), and MEXT_ALIGN() as
899 * separate macros, each asserting that it was called at the proper moment.
900 * This required callers to themselves test the storage type and call the
901 * right one. Rather than require callers to be aware of those layout
902 * decisions, we centralize here.
905 m_align(struct mbuf *m, int len)
908 const char *msg = "%s: not a virgin mbuf";
912 KASSERT(m->m_data == M_START(m), (msg, __func__));
914 adjust = M_SIZE(m) - len;
915 m->m_data += adjust &~ (sizeof(long)-1);
918 #define M_ALIGN(m, len) m_align(m, len)
919 #define MH_ALIGN(m, len) m_align(m, len)
920 #define MEXT_ALIGN(m, len) m_align(m, len)
923 * Compute the amount of space available before the current start of data in
926 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
927 * of checking writability of the mbuf data area rests solely with the caller.
929 * NB: In previous versions, M_LEADINGSPACE() would only check M_WRITABLE()
930 * for mbufs with external storage. We now allow mbuf-embedded data to be
933 #define M_LEADINGSPACE(m) \
934 (M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0)
937 * Compute the amount of space available after the end of data in an mbuf.
939 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
940 * of checking writability of the mbuf data area rests solely with the caller.
942 * NB: In previous versions, M_TRAILINGSPACE() would only check M_WRITABLE()
943 * for mbufs with external storage. We now allow mbuf-embedded data to be
946 #define M_TRAILINGSPACE(m) \
948 ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len)) : 0)
951 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be
952 * allocated, how specifies whether to wait. If the allocation fails, the
953 * original mbuf chain is freed and m is set to NULL.
955 #define M_PREPEND(m, plen, how) do { \
956 struct mbuf **_mmp = &(m); \
957 struct mbuf *_mm = *_mmp; \
958 int _mplen = (plen); \
959 int __mhow = (how); \
961 MBUF_CHECKSLEEP(how); \
962 if (M_LEADINGSPACE(_mm) >= _mplen) { \
963 _mm->m_data -= _mplen; \
964 _mm->m_len += _mplen; \
966 _mm = m_prepend(_mm, _mplen, __mhow); \
967 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
968 _mm->m_pkthdr.len += _mplen; \
973 * Change mbuf to new type. This is a relatively expensive operation and
976 #define MCHTYPE(m, t) m_chtype((m), (t))
978 /* Length to m_copy to copy all. */
979 #define M_COPYALL 1000000000
981 /* Compatibility with 4.3. */
982 #define m_copy(m, o, l) m_copym((m), (o), (l), M_NOWAIT)
984 extern int max_datalen; /* MHLEN - max_hdr */
985 extern int max_hdr; /* Largest link + protocol header */
986 extern int max_linkhdr; /* Largest link-level header */
987 extern int max_protohdr; /* Largest protocol header */
988 extern int nmbclusters; /* Maximum number of clusters */
991 * Network packets may have annotations attached by affixing a list of
992 * "packet tags" to the pkthdr structure. Packet tags are dynamically
993 * allocated semi-opaque data structures that have a fixed header
994 * (struct m_tag) that specifies the size of the memory block and a
995 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique
996 * unsigned value used to identify a module or ABI. By convention this value
997 * is chosen as the date+time that the module is created, expressed as the
998 * number of seconds since the epoch (e.g., using date -u +'%s'). The type
999 * value is an ABI/module-specific value that identifies a particular
1000 * annotation and is private to the module. For compatibility with systems
1001 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
1002 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
1003 * compatibility shim functions and several tag types are defined below.
1004 * Users that do not require compatibility should use a private cookie value
1005 * so that packet tag-related definitions can be maintained privately.
1007 * Note that the packet tag returned by m_tag_alloc has the default memory
1008 * alignment implemented by malloc. To reference private data one can use a
1011 * struct m_tag *mtag = m_tag_alloc(...);
1012 * struct foo *p = (struct foo *)(mtag+1);
1014 * if the alignment of struct m_tag is sufficient for referencing members of
1015 * struct foo. Otherwise it is necessary to embed struct m_tag within the
1016 * private data structure to insure proper alignment; e.g.,
1022 * struct foo *p = (struct foo *) m_tag_alloc(...);
1023 * struct m_tag *mtag = &p->tag;
1027 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise
1028 * tags are expected to ``vanish'' when they pass through a network
1029 * interface. For most interfaces this happens normally as the tags are
1030 * reclaimed when the mbuf is free'd. However in some special cases
1031 * reclaiming must be done manually. An example is packets that pass through
1032 * the loopback interface. Also, one must be careful to do this when
1033 * ``turning around'' packets (e.g., icmp_reflect).
1035 * To mark a tag persistent bit-or this flag in when defining the tag id.
1036 * The tag will then be treated as described above.
1038 #define MTAG_PERSISTENT 0x800
1040 #define PACKET_TAG_NONE 0 /* Nadda */
1042 /* Packet tags for use with PACKET_ABI_COMPAT. */
1043 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
1044 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
1045 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
1046 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
1047 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */
1048 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */
1049 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */
1050 #define PACKET_TAG_GIF 8 /* GIF processing done */
1051 #define PACKET_TAG_GRE 9 /* GRE processing done */
1052 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */
1053 #define PACKET_TAG_ENCAP 11 /* Encap. processing */
1054 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */
1055 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */
1056 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */
1057 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
1058 #define PACKET_TAG_DIVERT 17 /* divert info */
1059 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
1060 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */
1061 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */
1062 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */
1063 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */
1064 #define PACKET_TAG_CARP 28 /* CARP info */
1065 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */
1066 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */
1068 /* Specific cookies and tags. */
1070 /* Packet tag routines. */
1071 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
1072 void m_tag_delete(struct mbuf *, struct m_tag *);
1073 void m_tag_delete_chain(struct mbuf *, struct m_tag *);
1074 void m_tag_free_default(struct m_tag *);
1075 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
1076 struct m_tag *m_tag_copy(struct m_tag *, int);
1077 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
1078 void m_tag_delete_nonpersistent(struct mbuf *);
1081 * Initialize the list of tags associated with an mbuf.
1083 static __inline void
1084 m_tag_init(struct mbuf *m)
1087 SLIST_INIT(&m->m_pkthdr.tags);
1091 * Set up the contents of a tag. Note that this does not fill in the free
1092 * method; the caller is expected to do that.
1094 * XXX probably should be called m_tag_init, but that was already taken.
1096 static __inline void
1097 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
1102 t->m_tag_cookie = cookie;
1106 * Reclaim resources associated with a tag.
1108 static __inline void
1109 m_tag_free(struct m_tag *t)
1112 (*t->m_tag_free)(t);
1116 * Return the first tag associated with an mbuf.
1118 static __inline struct m_tag *
1119 m_tag_first(struct mbuf *m)
1122 return (SLIST_FIRST(&m->m_pkthdr.tags));
1126 * Return the next tag in the list of tags associated with an mbuf.
1128 static __inline struct m_tag *
1129 m_tag_next(struct mbuf *m __unused, struct m_tag *t)
1132 return (SLIST_NEXT(t, m_tag_link));
1136 * Prepend a tag to the list of tags associated with an mbuf.
1138 static __inline void
1139 m_tag_prepend(struct mbuf *m, struct m_tag *t)
1142 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
1146 * Unlink a tag from the list of tags associated with an mbuf.
1148 static __inline void
1149 m_tag_unlink(struct mbuf *m, struct m_tag *t)
1152 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
1155 /* These are for OpenBSD compatibility. */
1156 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
1158 static __inline struct m_tag *
1159 m_tag_get(int type, int length, int wait)
1161 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
1164 static __inline struct m_tag *
1165 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
1167 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
1168 m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
1171 static __inline struct mbuf *
1172 m_free(struct mbuf *m)
1174 struct mbuf *n = m->m_next;
1176 MBUF_PROBE1(m__free, m);
1177 if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE))
1178 m_tag_delete_chain(m, NULL);
1179 if (m->m_flags & M_EXT)
1181 else if ((m->m_flags & M_NOFREE) == 0)
1182 uma_zfree(zone_mbuf, m);
1187 rt_m_getfib(struct mbuf *m)
1189 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf."));
1190 return (m->m_pkthdr.fibnum);
1193 #define M_GETFIB(_m) rt_m_getfib(_m)
1195 #define M_SETFIB(_m, _fib) do { \
1196 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \
1197 ((_m)->m_pkthdr.fibnum) = (_fib); \
1200 /* flags passed as first argument for "m_ether_tcpip_hash()" */
1201 #define MBUF_HASHFLAG_L2 (1 << 2)
1202 #define MBUF_HASHFLAG_L3 (1 << 3)
1203 #define MBUF_HASHFLAG_L4 (1 << 4)
1205 /* mbuf hashing helper routines */
1206 uint32_t m_ether_tcpip_hash_init(void);
1207 uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, const uint32_t);
1209 #ifdef MBUF_PROFILING
1210 void m_profile(struct mbuf *m);
1211 #define M_PROFILE(m) m_profile(m)
1213 #define M_PROFILE(m)
1217 STAILQ_HEAD(, mbuf) mq_head;
1223 mbufq_init(struct mbufq *mq, int maxlen)
1226 STAILQ_INIT(&mq->mq_head);
1227 mq->mq_maxlen = maxlen;
1231 static inline struct mbuf *
1232 mbufq_flush(struct mbufq *mq)
1236 m = STAILQ_FIRST(&mq->mq_head);
1237 STAILQ_INIT(&mq->mq_head);
1243 mbufq_drain(struct mbufq *mq)
1247 n = mbufq_flush(mq);
1248 while ((m = n) != NULL) {
1249 n = STAILQ_NEXT(m, m_stailqpkt);
1254 static inline struct mbuf *
1255 mbufq_first(const struct mbufq *mq)
1258 return (STAILQ_FIRST(&mq->mq_head));
1261 static inline struct mbuf *
1262 mbufq_last(const struct mbufq *mq)
1265 return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
1269 mbufq_full(const struct mbufq *mq)
1272 return (mq->mq_len >= mq->mq_maxlen);
1276 mbufq_len(const struct mbufq *mq)
1279 return (mq->mq_len);
1283 mbufq_enqueue(struct mbufq *mq, struct mbuf *m)
1288 STAILQ_INSERT_TAIL(&mq->mq_head, m, m_stailqpkt);
1293 static inline struct mbuf *
1294 mbufq_dequeue(struct mbufq *mq)
1298 m = STAILQ_FIRST(&mq->mq_head);
1300 STAILQ_REMOVE_HEAD(&mq->mq_head, m_stailqpkt);
1301 m->m_nextpkt = NULL;
1308 mbufq_prepend(struct mbufq *mq, struct mbuf *m)
1311 STAILQ_INSERT_HEAD(&mq->mq_head, m, m_stailqpkt);
1314 #endif /* _KERNEL */
1315 #endif /* !_SYS_MBUF_H_ */