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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 * Static network interface owned tag.
134 * Allocated through ifp->if_snd_tag_alloc().
137 struct ifnet *ifp; /* network interface tag belongs to */
141 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
144 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
149 struct m_snd_tag *snd_tag; /* send tag, if any */
150 struct ifnet *rcvif; /* rcv interface */
152 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
153 int32_t len; /* total packet length */
155 /* Layer crossing persistent information. */
156 uint32_t flowid; /* packet's 4-tuple system */
157 uint64_t csum_flags; /* checksum and offload features */
158 uint16_t fibnum; /* this packet should use this fib */
159 uint8_t cosqos; /* class/quality of service */
160 uint8_t rsstype; /* hash type */
161 uint8_t l2hlen; /* layer 2 header length */
162 uint8_t l3hlen; /* layer 3 header length */
163 uint8_t l4hlen; /* layer 4 header length */
164 uint8_t l5hlen; /* layer 5 header length */
168 uint32_t thirtytwo[2];
169 uint64_t sixtyfour[1];
170 uintptr_t unintptr[1];
174 /* Layer specific non-persistent local storage for reassembly, etc. */
178 uint32_t thirtytwo[2];
179 uint64_t sixtyfour[1];
180 uintptr_t unintptr[1];
184 #define ether_vtag PH_per.sixteen[0]
186 #define vt_nrecs sixteen[0]
187 #define tso_segsz PH_per.sixteen[1]
188 #define lro_nsegs tso_segsz
189 #define csum_phsum PH_per.sixteen[2]
190 #define csum_data PH_per.thirtytwo[1]
193 * Description of external storage mapped into mbuf; valid only if M_EXT is
197 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
202 volatile u_int ext_count; /* value of ref count info */
203 volatile u_int *ext_cnt; /* pointer to ref count info */
205 caddr_t ext_buf; /* start of buffer */
206 uint32_t ext_size; /* size of buffer, for ext_free */
207 uint32_t ext_type:8, /* type of external storage */
208 ext_flags:24; /* external storage mbuf flags */
209 void (*ext_free) /* free routine if not the usual */
210 (struct mbuf *, void *, void *);
211 void *ext_arg1; /* optional argument pointer */
212 void *ext_arg2; /* optional argument pointer */
216 * The core of the mbuf object along with some shortcut defines for practical
221 * Header present at the beginning of every mbuf.
224 * Compile-time assertions in uipc_mbuf.c test these values to ensure
225 * that they are correct.
227 union { /* next buffer in chain */
229 SLIST_ENTRY(mbuf) m_slist;
230 STAILQ_ENTRY(mbuf) m_stailq;
232 union { /* next chain in queue/record */
233 struct mbuf *m_nextpkt;
234 SLIST_ENTRY(mbuf) m_slistpkt;
235 STAILQ_ENTRY(mbuf) m_stailqpkt;
237 caddr_t m_data; /* location of data */
238 int32_t m_len; /* amount of data in this mbuf */
239 uint32_t m_type:8, /* type of data in this mbuf */
240 m_flags:24; /* flags; see below */
241 #if !defined(__LP64__)
242 uint32_t m_pad; /* pad for 64bit alignment */
246 * A set of optional headers (packet header, external storage header)
247 * and internal data storage. Historically, these arrays were sized
248 * to MHLEN (space left after a packet header) and MLEN (space left
249 * after only a regular mbuf header); they are now variable size in
250 * order to support future work on variable-size mbufs.
254 struct pkthdr m_pkthdr; /* M_PKTHDR set */
256 struct m_ext m_ext; /* M_EXT set */
260 char m_dat[0]; /* !M_PKTHDR, !M_EXT */
265 * mbuf flags of global significance and layer crossing.
266 * Those of only protocol/layer specific significance are to be mapped
267 * to M_PROTO[1-12] and cleared at layer handoff boundaries.
268 * NB: Limited to the lower 24 bits.
270 #define M_EXT 0x00000001 /* has associated external storage */
271 #define M_PKTHDR 0x00000002 /* start of record */
272 #define M_EOR 0x00000004 /* end of record */
273 #define M_RDONLY 0x00000008 /* associated data is marked read-only */
274 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */
275 #define M_MCAST 0x00000020 /* send/received as link-level multicast */
276 #define M_PROMISC 0x00000040 /* packet was not for us */
277 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */
278 #define M_UNUSED_8 0x00000100 /* --available-- */
279 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */
281 #define M_PROTO1 0x00001000 /* protocol-specific */
282 #define M_PROTO2 0x00002000 /* protocol-specific */
283 #define M_PROTO3 0x00004000 /* protocol-specific */
284 #define M_PROTO4 0x00008000 /* protocol-specific */
285 #define M_PROTO5 0x00010000 /* protocol-specific */
286 #define M_PROTO6 0x00020000 /* protocol-specific */
287 #define M_PROTO7 0x00040000 /* protocol-specific */
288 #define M_PROTO8 0x00080000 /* protocol-specific */
289 #define M_PROTO9 0x00100000 /* protocol-specific */
290 #define M_PROTO10 0x00200000 /* protocol-specific */
291 #define M_PROTO11 0x00400000 /* protocol-specific */
292 #define M_PROTO12 0x00800000 /* protocol-specific */
294 #define MB_DTOR_SKIP 0x1 /* don't pollute the cache by touching a freed mbuf */
297 * Flags to purge when crossing layers.
299 #define M_PROTOFLAGS \
300 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\
301 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12)
304 * Flags preserved when copying m_pkthdr.
306 #define M_COPYFLAGS \
307 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG| \
311 * Mbuf flag description for use with printf(9) %b identifier.
313 #define M_FLAG_BITS \
314 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \
315 "\7M_PROMISC\10M_VLANTAG"
316 #define M_FLAG_PROTOBITS \
317 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \
318 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \
319 "\27M_PROTO11\30M_PROTO12"
320 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS)
323 * Network interface cards are able to hash protocol fields (such as IPv4
324 * addresses and TCP port numbers) classify packets into flows. These flows
325 * can then be used to maintain ordering while delivering packets to the OS
326 * via parallel input queues, as well as to provide a stateless affinity
327 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set
328 * m_flag fields to indicate how the hash should be interpreted by the
331 * Most NICs support RSS, which provides ordering and explicit affinity, and
332 * use the hash m_flag bits to indicate what header fields were covered by
333 * the hash. M_HASHTYPE_OPAQUE and M_HASHTYPE_OPAQUE_HASH can be set by non-
334 * RSS cards or configurations that provide an opaque flow identifier, allowing
335 * for ordering and distribution without explicit affinity. Additionally,
336 * M_HASHTYPE_OPAQUE_HASH indicates that the flow identifier has hash
339 #define M_HASHTYPE_HASHPROP 0x80 /* has hash properties */
340 #define M_HASHTYPE_HASH(t) (M_HASHTYPE_HASHPROP | (t))
341 /* Microsoft RSS standard hash types */
342 #define M_HASHTYPE_NONE 0
343 #define M_HASHTYPE_RSS_IPV4 M_HASHTYPE_HASH(1) /* IPv4 2-tuple */
344 #define M_HASHTYPE_RSS_TCP_IPV4 M_HASHTYPE_HASH(2) /* TCPv4 4-tuple */
345 #define M_HASHTYPE_RSS_IPV6 M_HASHTYPE_HASH(3) /* IPv6 2-tuple */
346 #define M_HASHTYPE_RSS_TCP_IPV6 M_HASHTYPE_HASH(4) /* TCPv6 4-tuple */
347 #define M_HASHTYPE_RSS_IPV6_EX M_HASHTYPE_HASH(5) /* IPv6 2-tuple +
349 #define M_HASHTYPE_RSS_TCP_IPV6_EX M_HASHTYPE_HASH(6) /* TCPv6 4-tuple +
351 /* Non-standard RSS hash types */
352 #define M_HASHTYPE_RSS_UDP_IPV4 M_HASHTYPE_HASH(7) /* IPv4 UDP 4-tuple*/
353 #define M_HASHTYPE_RSS_UDP_IPV4_EX M_HASHTYPE_HASH(8) /* IPv4 UDP 4-tuple +
355 #define M_HASHTYPE_RSS_UDP_IPV6 M_HASHTYPE_HASH(9) /* IPv6 UDP 4-tuple*/
356 #define M_HASHTYPE_RSS_UDP_IPV6_EX M_HASHTYPE_HASH(10)/* IPv6 UDP 4-tuple +
359 #define M_HASHTYPE_OPAQUE 63 /* ordering, not affinity */
360 #define M_HASHTYPE_OPAQUE_HASH M_HASHTYPE_HASH(M_HASHTYPE_OPAQUE)
361 /* ordering+hash, not affinity*/
363 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0)
364 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype)
365 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v))
366 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v))
367 #define M_HASHTYPE_ISHASH(m) (M_HASHTYPE_GET(m) & M_HASHTYPE_HASHPROP)
370 * COS/QOS class and quality of service tags.
371 * It uses DSCP code points as base.
373 #define QOS_DSCP_CS0 0x00
374 #define QOS_DSCP_DEF QOS_DSCP_CS0
375 #define QOS_DSCP_CS1 0x20
376 #define QOS_DSCP_AF11 0x28
377 #define QOS_DSCP_AF12 0x30
378 #define QOS_DSCP_AF13 0x38
379 #define QOS_DSCP_CS2 0x40
380 #define QOS_DSCP_AF21 0x48
381 #define QOS_DSCP_AF22 0x50
382 #define QOS_DSCP_AF23 0x58
383 #define QOS_DSCP_CS3 0x60
384 #define QOS_DSCP_AF31 0x68
385 #define QOS_DSCP_AF32 0x70
386 #define QOS_DSCP_AF33 0x78
387 #define QOS_DSCP_CS4 0x80
388 #define QOS_DSCP_AF41 0x88
389 #define QOS_DSCP_AF42 0x90
390 #define QOS_DSCP_AF43 0x98
391 #define QOS_DSCP_CS5 0xa0
392 #define QOS_DSCP_EF 0xb8
393 #define QOS_DSCP_CS6 0xc0
394 #define QOS_DSCP_CS7 0xe0
397 * External mbuf storage buffer types.
399 #define EXT_CLUSTER 1 /* mbuf cluster */
400 #define EXT_SFBUF 2 /* sendfile(2)'s sf_buf */
401 #define EXT_JUMBOP 3 /* jumbo cluster page sized */
402 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */
403 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
404 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */
405 #define EXT_MBUF 7 /* external mbuf reference */
406 #define EXT_SFBUF_NOCACHE 8 /* sendfile(2)'s sf_buf not to be cached */
408 #define EXT_VENDOR1 224 /* for vendor-internal use */
409 #define EXT_VENDOR2 225 /* for vendor-internal use */
410 #define EXT_VENDOR3 226 /* for vendor-internal use */
411 #define EXT_VENDOR4 227 /* for vendor-internal use */
413 #define EXT_EXP1 244 /* for experimental use */
414 #define EXT_EXP2 245 /* for experimental use */
415 #define EXT_EXP3 246 /* for experimental use */
416 #define EXT_EXP4 247 /* for experimental use */
418 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */
419 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */
420 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */
421 #define EXT_EXTREF 255 /* has externally maintained ext_cnt ptr */
424 * Flags for external mbuf buffer types.
425 * NB: limited to the lower 24 bits.
427 #define EXT_FLAG_EMBREF 0x000001 /* embedded ext_count */
428 #define EXT_FLAG_EXTREF 0x000002 /* external ext_cnt, notyet */
430 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */
432 #define EXT_FLAG_VENDOR1 0x010000 /* for vendor-internal use */
433 #define EXT_FLAG_VENDOR2 0x020000 /* for vendor-internal use */
434 #define EXT_FLAG_VENDOR3 0x040000 /* for vendor-internal use */
435 #define EXT_FLAG_VENDOR4 0x080000 /* for vendor-internal use */
437 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */
438 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */
439 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */
440 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */
443 * EXT flag description for use with printf(9) %b identifier.
445 #define EXT_FLAG_BITS \
446 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \
447 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \
448 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \
452 * External reference/free functions.
454 void sf_ext_free(void *, void *);
455 void sf_ext_free_nocache(void *, void *);
458 * Flags indicating checksum, segmentation and other offload work to be
459 * done, or already done, by hardware or lower layers. It is split into
460 * separate inbound and outbound flags.
462 * Outbound flags that are set by upper protocol layers requesting lower
463 * layers, or ideally the hardware, to perform these offloading tasks.
464 * For outbound packets this field and its flags can be directly tested
465 * against ifnet if_hwassist.
467 #define CSUM_IP 0x00000001 /* IP header checksum offload */
468 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */
469 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */
470 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */
471 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */
472 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */
474 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */
475 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */
476 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */
477 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */
478 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */
480 /* Inbound checksum support where the checksum was verified by hardware. */
481 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */
482 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */
483 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */
484 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */
485 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */
486 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */
487 #define CSUM_COALESCED 0x40000000 /* contains merged segments */
490 * CSUM flag description for use with printf(9) %b identifier.
493 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \
495 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \
496 "\16CSUM_IP6_ISCSI" \
497 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \
498 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESCED"
500 /* CSUM flags compatibility mappings. */
501 #define CSUM_IP_CHECKED CSUM_L3_CALC
502 #define CSUM_IP_VALID CSUM_L3_VALID
503 #define CSUM_DATA_VALID CSUM_L4_VALID
504 #define CSUM_PSEUDO_HDR CSUM_L4_CALC
505 #define CSUM_SCTP_VALID CSUM_L4_VALID
506 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP)
507 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */
508 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6)
509 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID
510 #define CSUM_TCP CSUM_IP_TCP
511 #define CSUM_UDP CSUM_IP_UDP
512 #define CSUM_SCTP CSUM_IP_SCTP
513 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO)
514 #define CSUM_UDP_IPV6 CSUM_IP6_UDP
515 #define CSUM_TCP_IPV6 CSUM_IP6_TCP
516 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP
519 * mbuf types describing the content of the mbuf (including external storage).
521 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
522 #define MT_DATA 1 /* dynamic (data) allocation */
523 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */
525 #define MT_VENDOR1 4 /* for vendor-internal use */
526 #define MT_VENDOR2 5 /* for vendor-internal use */
527 #define MT_VENDOR3 6 /* for vendor-internal use */
528 #define MT_VENDOR4 7 /* for vendor-internal use */
530 #define MT_SONAME 8 /* socket name */
532 #define MT_EXP1 9 /* for experimental use */
533 #define MT_EXP2 10 /* for experimental use */
534 #define MT_EXP3 11 /* for experimental use */
535 #define MT_EXP4 12 /* for experimental use */
537 #define MT_CONTROL 14 /* extra-data protocol message */
538 #define MT_OOBDATA 15 /* expedited data */
539 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
541 #define MT_NOINIT 255 /* Not a type but a flag to allocate
542 a non-initialized mbuf */
545 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to
546 * !_KERNEL so that monitoring tools can look up the zones with
549 #define MBUF_MEM_NAME "mbuf"
550 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster"
551 #define MBUF_PACKET_MEM_NAME "mbuf_packet"
552 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page"
553 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k"
554 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k"
555 #define MBUF_TAG_MEM_NAME "mbuf_tag"
556 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
561 #define MBUF_CHECKSLEEP(how) do { \
562 if (how == M_WAITOK) \
563 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \
564 "Sleeping in \"%s\"", __func__); \
567 #define MBUF_CHECKSLEEP(how)
571 * Network buffer allocation API
573 * The rest of it is defined in kern/kern_mbuf.c
575 extern uma_zone_t zone_mbuf;
576 extern uma_zone_t zone_clust;
577 extern uma_zone_t zone_pack;
578 extern uma_zone_t zone_jumbop;
579 extern uma_zone_t zone_jumbo9;
580 extern uma_zone_t zone_jumbo16;
582 void mb_dupcl(struct mbuf *, struct mbuf *);
583 void mb_free_ext(struct mbuf *);
584 void m_adj(struct mbuf *, int);
585 int m_apply(struct mbuf *, int, int,
586 int (*)(void *, void *, u_int), void *);
587 int m_append(struct mbuf *, int, c_caddr_t);
588 void m_cat(struct mbuf *, struct mbuf *);
589 void m_catpkt(struct mbuf *, struct mbuf *);
590 int m_clget(struct mbuf *m, int how);
591 void *m_cljget(struct mbuf *m, int how, int size);
592 struct mbuf *m_collapse(struct mbuf *, int, int);
593 void m_copyback(struct mbuf *, int, int, c_caddr_t);
594 void m_copydata(const struct mbuf *, int, int, caddr_t);
595 struct mbuf *m_copym(struct mbuf *, int, int, int);
596 struct mbuf *m_copypacket(struct mbuf *, int);
597 void m_copy_pkthdr(struct mbuf *, struct mbuf *);
598 struct mbuf *m_copyup(struct mbuf *, int, int);
599 struct mbuf *m_defrag(struct mbuf *, int);
600 void m_demote_pkthdr(struct mbuf *);
601 void m_demote(struct mbuf *, int, int);
602 struct mbuf *m_devget(char *, int, int, struct ifnet *,
603 void (*)(char *, caddr_t, u_int));
604 struct mbuf *m_dup(const struct mbuf *, int);
605 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
606 void m_extadd(struct mbuf *, caddr_t, u_int,
607 void (*)(struct mbuf *, void *, void *), void *, void *,
609 u_int m_fixhdr(struct mbuf *);
610 struct mbuf *m_fragment(struct mbuf *, int, int);
611 void m_freem(struct mbuf *);
612 struct mbuf *m_get2(int, int, short, int);
613 struct mbuf *m_getjcl(int, short, int, int);
614 struct mbuf *m_getm2(struct mbuf *, int, int, short, int);
615 struct mbuf *m_getptr(struct mbuf *, int, int *);
616 u_int m_length(struct mbuf *, struct mbuf **);
617 int m_mbuftouio(struct uio *, const struct mbuf *, int);
618 void m_move_pkthdr(struct mbuf *, struct mbuf *);
619 int m_pkthdr_init(struct mbuf *, int);
620 struct mbuf *m_prepend(struct mbuf *, int, int);
621 void m_print(const struct mbuf *, int);
622 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
623 struct mbuf *m_pullup(struct mbuf *, int);
624 int m_sanity(struct mbuf *, int);
625 struct mbuf *m_split(struct mbuf *, int, int);
626 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int);
627 struct mbuf *m_unshare(struct mbuf *, int);
641 #if MJUMPAGESIZE != MCLBYTES
653 panic("%s: invalid cluster size %d", __func__, size);
660 * Associated an external reference counted buffer with an mbuf.
663 m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt,
664 void (*freef)(struct mbuf *, void *, void *), void *arg1, void *arg2)
667 KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__));
669 atomic_add_int(ref_cnt, 1);
671 m->m_ext.ext_buf = buf;
672 m->m_ext.ext_cnt = ref_cnt;
673 m->m_data = m->m_ext.ext_buf;
674 m->m_ext.ext_size = size;
675 m->m_ext.ext_free = freef;
676 m->m_ext.ext_arg1 = arg1;
677 m->m_ext.ext_arg2 = arg2;
678 m->m_ext.ext_type = EXT_EXTREF;
679 m->m_ext.ext_flags = 0;
682 static __inline uma_zone_t
691 #if MJUMPAGESIZE != MCLBYTES
703 panic("%s: invalid cluster size %d", __func__, size);
710 * Initialize an mbuf with linear storage.
712 * Inline because the consumer text overhead will be roughly the same to
713 * initialize or call a function with this many parameters and M_PKTHDR
714 * should go away with constant propagation for !MGETHDR.
717 m_init(struct mbuf *m, int how, short type, int flags)
723 m->m_data = m->m_dat;
727 if (flags & M_PKTHDR)
728 error = m_pkthdr_init(m, how);
732 MBUF_PROBE5(m__init, m, how, type, flags, error);
736 static __inline struct mbuf *
737 m_get(int how, short type)
744 m = uma_zalloc_arg(zone_mbuf, &args, how);
745 MBUF_PROBE3(m__get, how, type, m);
749 static __inline struct mbuf *
750 m_gethdr(int how, short type)
755 args.flags = M_PKTHDR;
757 m = uma_zalloc_arg(zone_mbuf, &args, how);
758 MBUF_PROBE3(m__gethdr, how, type, m);
762 static __inline struct mbuf *
763 m_getcl(int how, short type, int flags)
770 m = uma_zalloc_arg(zone_pack, &args, how);
771 MBUF_PROBE4(m__getcl, how, type, flags, m);
776 * XXX: m_cljset() is a dangerous API. One must attach only a new,
777 * unreferenced cluster to an mbuf(9). It is not possible to assert
778 * that, so care can be taken only by users of the API.
781 m_cljset(struct mbuf *m, void *cl, int type)
789 #if MJUMPAGESIZE != MCLBYTES
801 panic("%s: unknown cluster type %d", __func__, type);
805 m->m_data = m->m_ext.ext_buf = cl;
806 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
807 m->m_ext.ext_size = size;
808 m->m_ext.ext_type = type;
809 m->m_ext.ext_flags = EXT_FLAG_EMBREF;
810 m->m_ext.ext_count = 1;
812 MBUF_PROBE3(m__cljset, m, cl, type);
816 m_chtype(struct mbuf *m, short new_type)
819 m->m_type = new_type;
823 m_clrprotoflags(struct mbuf *m)
827 m->m_flags &= ~M_PROTOFLAGS;
832 static __inline struct mbuf *
833 m_last(struct mbuf *m)
842 m_extrefcnt(struct mbuf *m)
845 KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing", __func__));
847 return ((m->m_ext.ext_flags & EXT_FLAG_EMBREF) ? m->m_ext.ext_count :
852 * mbuf, cluster, and external object allocation macros (for compatibility
855 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
856 #define MGET(m, how, type) ((m) = m_get((how), (type)))
857 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type)))
858 #define MCLGET(m, how) m_clget((m), (how))
859 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \
860 m_extadd((m), (caddr_t)(buf), (size), (free), (arg1), (arg2), \
862 #define m_getm(m, len, how, type) \
863 m_getm2((m), (len), (how), (type), M_PKTHDR)
866 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
867 * be both the local data payload, or an external buffer area, depending on
868 * whether M_EXT is set).
870 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \
871 (!(((m)->m_flags & M_EXT)) || \
872 (m_extrefcnt(m) == 1)))
874 /* Check if the supplied mbuf has a packet header, or else panic. */
875 #define M_ASSERTPKTHDR(m) \
876 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \
877 ("%s: no mbuf packet header!", __func__))
880 * Ensure that the supplied mbuf is a valid, non-free mbuf.
882 * XXX: Broken at the moment. Need some UMA magic to make it work again.
884 #define M_ASSERTVALID(m) \
885 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \
886 ("%s: attempted use of a free mbuf!", __func__))
889 * Return the address of the start of the buffer associated with an mbuf,
890 * handling external storage, packet-header mbufs, and regular data mbufs.
893 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \
894 ((m)->m_flags & M_PKTHDR) ? &(m)->m_pktdat[0] : \
898 * Return the size of the buffer associated with an mbuf, handling external
899 * storage, packet-header mbufs, and regular data mbufs.
902 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \
903 ((m)->m_flags & M_PKTHDR) ? MHLEN : \
907 * Set the m_data pointer of a newly allocated mbuf to place an object of the
908 * specified size at the end of the mbuf, longword aligned.
910 * NB: Historically, we had M_ALIGN(), MH_ALIGN(), and MEXT_ALIGN() as
911 * separate macros, each asserting that it was called at the proper moment.
912 * This required callers to themselves test the storage type and call the
913 * right one. Rather than require callers to be aware of those layout
914 * decisions, we centralize here.
917 m_align(struct mbuf *m, int len)
920 const char *msg = "%s: not a virgin mbuf";
924 KASSERT(m->m_data == M_START(m), (msg, __func__));
926 adjust = M_SIZE(m) - len;
927 m->m_data += adjust &~ (sizeof(long)-1);
930 #define M_ALIGN(m, len) m_align(m, len)
931 #define MH_ALIGN(m, len) m_align(m, len)
932 #define MEXT_ALIGN(m, len) m_align(m, len)
935 * Compute the amount of space available before the current start of data in
938 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
939 * of checking writability of the mbuf data area rests solely with the caller.
941 * NB: In previous versions, M_LEADINGSPACE() would only check M_WRITABLE()
942 * for mbufs with external storage. We now allow mbuf-embedded data to be
945 #define M_LEADINGSPACE(m) \
946 (M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0)
949 * Compute the amount of space available after the end of data in an mbuf.
951 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
952 * of checking writability of the mbuf data area rests solely with the caller.
954 * NB: In previous versions, M_TRAILINGSPACE() would only check M_WRITABLE()
955 * for mbufs with external storage. We now allow mbuf-embedded data to be
958 #define M_TRAILINGSPACE(m) \
960 ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len)) : 0)
963 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be
964 * allocated, how specifies whether to wait. If the allocation fails, the
965 * original mbuf chain is freed and m is set to NULL.
967 #define M_PREPEND(m, plen, how) do { \
968 struct mbuf **_mmp = &(m); \
969 struct mbuf *_mm = *_mmp; \
970 int _mplen = (plen); \
971 int __mhow = (how); \
973 MBUF_CHECKSLEEP(how); \
974 if (M_LEADINGSPACE(_mm) >= _mplen) { \
975 _mm->m_data -= _mplen; \
976 _mm->m_len += _mplen; \
978 _mm = m_prepend(_mm, _mplen, __mhow); \
979 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
980 _mm->m_pkthdr.len += _mplen; \
985 * Change mbuf to new type. This is a relatively expensive operation and
988 #define MCHTYPE(m, t) m_chtype((m), (t))
990 /* Length to m_copy to copy all. */
991 #define M_COPYALL 1000000000
993 extern int max_datalen; /* MHLEN - max_hdr */
994 extern int max_hdr; /* Largest link + protocol header */
995 extern int max_linkhdr; /* Largest link-level header */
996 extern int max_protohdr; /* Largest protocol header */
997 extern int nmbclusters; /* Maximum number of clusters */
1000 * Network packets may have annotations attached by affixing a list of
1001 * "packet tags" to the pkthdr structure. Packet tags are dynamically
1002 * allocated semi-opaque data structures that have a fixed header
1003 * (struct m_tag) that specifies the size of the memory block and a
1004 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique
1005 * unsigned value used to identify a module or ABI. By convention this value
1006 * is chosen as the date+time that the module is created, expressed as the
1007 * number of seconds since the epoch (e.g., using date -u +'%s'). The type
1008 * value is an ABI/module-specific value that identifies a particular
1009 * annotation and is private to the module. For compatibility with systems
1010 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
1011 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
1012 * compatibility shim functions and several tag types are defined below.
1013 * Users that do not require compatibility should use a private cookie value
1014 * so that packet tag-related definitions can be maintained privately.
1016 * Note that the packet tag returned by m_tag_alloc has the default memory
1017 * alignment implemented by malloc. To reference private data one can use a
1020 * struct m_tag *mtag = m_tag_alloc(...);
1021 * struct foo *p = (struct foo *)(mtag+1);
1023 * if the alignment of struct m_tag is sufficient for referencing members of
1024 * struct foo. Otherwise it is necessary to embed struct m_tag within the
1025 * private data structure to insure proper alignment; e.g.,
1031 * struct foo *p = (struct foo *) m_tag_alloc(...);
1032 * struct m_tag *mtag = &p->tag;
1036 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise
1037 * tags are expected to ``vanish'' when they pass through a network
1038 * interface. For most interfaces this happens normally as the tags are
1039 * reclaimed when the mbuf is free'd. However in some special cases
1040 * reclaiming must be done manually. An example is packets that pass through
1041 * the loopback interface. Also, one must be careful to do this when
1042 * ``turning around'' packets (e.g., icmp_reflect).
1044 * To mark a tag persistent bit-or this flag in when defining the tag id.
1045 * The tag will then be treated as described above.
1047 #define MTAG_PERSISTENT 0x800
1049 #define PACKET_TAG_NONE 0 /* Nadda */
1051 /* Packet tags for use with PACKET_ABI_COMPAT. */
1052 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
1053 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
1054 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
1055 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
1056 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */
1057 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */
1058 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */
1059 #define PACKET_TAG_GIF 8 /* GIF processing done */
1060 #define PACKET_TAG_GRE 9 /* GRE processing done */
1061 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */
1062 #define PACKET_TAG_ENCAP 11 /* Encap. processing */
1063 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */
1064 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */
1065 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */
1066 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
1067 #define PACKET_TAG_DIVERT 17 /* divert info */
1068 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
1069 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */
1070 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */
1071 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */
1072 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */
1073 #define PACKET_TAG_CARP 28 /* CARP info */
1074 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */
1075 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */
1077 /* Specific cookies and tags. */
1079 /* Packet tag routines. */
1080 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
1081 void m_tag_delete(struct mbuf *, struct m_tag *);
1082 void m_tag_delete_chain(struct mbuf *, struct m_tag *);
1083 void m_tag_free_default(struct m_tag *);
1084 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
1085 struct m_tag *m_tag_copy(struct m_tag *, int);
1086 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
1087 void m_tag_delete_nonpersistent(struct mbuf *);
1090 * Initialize the list of tags associated with an mbuf.
1092 static __inline void
1093 m_tag_init(struct mbuf *m)
1096 SLIST_INIT(&m->m_pkthdr.tags);
1100 * Set up the contents of a tag. Note that this does not fill in the free
1101 * method; the caller is expected to do that.
1103 * XXX probably should be called m_tag_init, but that was already taken.
1105 static __inline void
1106 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
1111 t->m_tag_cookie = cookie;
1115 * Reclaim resources associated with a tag.
1117 static __inline void
1118 m_tag_free(struct m_tag *t)
1121 (*t->m_tag_free)(t);
1125 * Return the first tag associated with an mbuf.
1127 static __inline struct m_tag *
1128 m_tag_first(struct mbuf *m)
1131 return (SLIST_FIRST(&m->m_pkthdr.tags));
1135 * Return the next tag in the list of tags associated with an mbuf.
1137 static __inline struct m_tag *
1138 m_tag_next(struct mbuf *m __unused, struct m_tag *t)
1141 return (SLIST_NEXT(t, m_tag_link));
1145 * Prepend a tag to the list of tags associated with an mbuf.
1147 static __inline void
1148 m_tag_prepend(struct mbuf *m, struct m_tag *t)
1151 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
1155 * Unlink a tag from the list of tags associated with an mbuf.
1157 static __inline void
1158 m_tag_unlink(struct mbuf *m, struct m_tag *t)
1161 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
1164 /* These are for OpenBSD compatibility. */
1165 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
1167 static __inline struct m_tag *
1168 m_tag_get(int type, int length, int wait)
1170 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
1173 static __inline struct m_tag *
1174 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
1176 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
1177 m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
1180 static __inline struct mbuf *
1181 m_free(struct mbuf *m)
1183 struct mbuf *n = m->m_next;
1185 MBUF_PROBE1(m__free, m);
1186 if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE))
1187 m_tag_delete_chain(m, NULL);
1188 if (m->m_flags & M_EXT)
1190 else if ((m->m_flags & M_NOFREE) == 0)
1191 uma_zfree(zone_mbuf, m);
1196 rt_m_getfib(struct mbuf *m)
1198 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf."));
1199 return (m->m_pkthdr.fibnum);
1202 #define M_GETFIB(_m) rt_m_getfib(_m)
1204 #define M_SETFIB(_m, _fib) do { \
1205 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \
1206 ((_m)->m_pkthdr.fibnum) = (_fib); \
1209 /* flags passed as first argument for "m_ether_tcpip_hash()" */
1210 #define MBUF_HASHFLAG_L2 (1 << 2)
1211 #define MBUF_HASHFLAG_L3 (1 << 3)
1212 #define MBUF_HASHFLAG_L4 (1 << 4)
1214 /* mbuf hashing helper routines */
1215 uint32_t m_ether_tcpip_hash_init(void);
1216 uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, const uint32_t);
1218 #ifdef MBUF_PROFILING
1219 void m_profile(struct mbuf *m);
1220 #define M_PROFILE(m) m_profile(m)
1222 #define M_PROFILE(m)
1226 STAILQ_HEAD(, mbuf) mq_head;
1232 mbufq_init(struct mbufq *mq, int maxlen)
1235 STAILQ_INIT(&mq->mq_head);
1236 mq->mq_maxlen = maxlen;
1240 static inline struct mbuf *
1241 mbufq_flush(struct mbufq *mq)
1245 m = STAILQ_FIRST(&mq->mq_head);
1246 STAILQ_INIT(&mq->mq_head);
1252 mbufq_drain(struct mbufq *mq)
1256 n = mbufq_flush(mq);
1257 while ((m = n) != NULL) {
1258 n = STAILQ_NEXT(m, m_stailqpkt);
1263 static inline struct mbuf *
1264 mbufq_first(const struct mbufq *mq)
1267 return (STAILQ_FIRST(&mq->mq_head));
1270 static inline struct mbuf *
1271 mbufq_last(const struct mbufq *mq)
1274 return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
1278 mbufq_full(const struct mbufq *mq)
1281 return (mq->mq_len >= mq->mq_maxlen);
1285 mbufq_len(const struct mbufq *mq)
1288 return (mq->mq_len);
1292 mbufq_enqueue(struct mbufq *mq, struct mbuf *m)
1297 STAILQ_INSERT_TAIL(&mq->mq_head, m, m_stailqpkt);
1302 static inline struct mbuf *
1303 mbufq_dequeue(struct mbufq *mq)
1307 m = STAILQ_FIRST(&mq->mq_head);
1309 STAILQ_REMOVE_HEAD(&mq->mq_head, m_stailqpkt);
1310 m->m_nextpkt = NULL;
1317 mbufq_prepend(struct mbufq *mq, struct mbuf *m)
1320 STAILQ_INSERT_HEAD(&mq->mq_head, m, m_stailqpkt);
1325 * Note: this doesn't enforce the maximum list size for dst.
1328 mbufq_concat(struct mbufq *mq_dst, struct mbufq *mq_src)
1331 mq_dst->mq_len += mq_src->mq_len;
1332 STAILQ_CONCAT(&mq_dst->mq_head, &mq_src->mq_head);
1336 #endif /* _KERNEL */
1337 #endif /* !_SYS_MBUF_H_ */