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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>
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
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.
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.
64 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
68 #define MHSIZE offsetof(struct mbuf, m_dat)
69 #define MPKTHSIZE offsetof(struct mbuf, m_pktdat)
70 #define MLEN ((int)(MSIZE - MHSIZE))
71 #define MHLEN ((int)(MSIZE - MPKTHSIZE))
72 #define MINCLSIZE (MHLEN + 1)
76 * Macro for type conversion: convert mbuf pointer to data pointer of correct
79 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
80 * mtodo(m, o) -- Same as above but with offset 'o' into data.
82 #define mtod(m, t) ((t)((m)->m_data))
83 #define mtodo(m, o) ((void *)(((m)->m_data) + (o)))
86 * Argument structure passed to UMA routines during mbuf and packet
90 int flags; /* Flags for mbuf being allocated */
91 short type; /* Type of mbuf being allocated */
96 * Packet tag structure (see below for details).
99 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
100 u_int16_t m_tag_id; /* Tag ID */
101 u_int16_t m_tag_len; /* Length of data */
102 u_int32_t m_tag_cookie; /* ABI/Module ID */
103 void (*m_tag_free)(struct m_tag *);
107 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
110 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
114 struct ifnet *rcvif; /* rcv interface */
115 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
116 int32_t len; /* total packet length */
118 /* Layer crossing persistent information. */
119 uint32_t flowid; /* packet's 4-tuple system */
120 uint64_t csum_flags; /* checksum and offload features */
121 uint16_t fibnum; /* this packet should use this fib */
122 uint8_t cosqos; /* class/quality of service */
123 uint8_t rsstype; /* hash type */
124 uint8_t l2hlen; /* layer 2 header length */
125 uint8_t l3hlen; /* layer 3 header length */
126 uint8_t l4hlen; /* layer 4 header length */
127 uint8_t l5hlen; /* layer 5 header length */
131 uint32_t thirtytwo[2];
132 uint64_t sixtyfour[1];
133 uintptr_t unintptr[1];
137 /* Layer specific non-persistent local storage for reassembly, etc. */
141 uint32_t thirtytwo[2];
142 uint64_t sixtyfour[1];
143 uintptr_t unintptr[1];
147 #define ether_vtag PH_per.sixteen[0]
149 #define vt_nrecs sixteen[0]
150 #define tso_segsz PH_per.sixteen[1]
151 #define csum_phsum PH_per.sixteen[2]
152 #define csum_data PH_per.thirtytwo[1]
155 * Description of external storage mapped into mbuf; valid only if M_EXT is
159 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
164 volatile u_int ext_count; /* value of ref count info */
165 volatile u_int *ext_cnt; /* pointer to ref count info */
167 caddr_t ext_buf; /* start of buffer */
168 uint32_t ext_size; /* size of buffer, for ext_free */
169 uint32_t ext_type:8, /* type of external storage */
170 ext_flags:24; /* external storage mbuf flags */
171 void (*ext_free) /* free routine if not the usual */
172 (struct mbuf *, void *, void *);
173 void *ext_arg1; /* optional argument pointer */
174 void *ext_arg2; /* optional argument pointer */
178 * The core of the mbuf object along with some shortcut defines for practical
183 * Header present at the beginning of every mbuf.
186 * Compile-time assertions in uipc_mbuf.c test these values to ensure
187 * that they are correct.
189 union { /* next buffer in chain */
191 SLIST_ENTRY(mbuf) m_slist;
192 STAILQ_ENTRY(mbuf) m_stailq;
194 union { /* next chain in queue/record */
195 struct mbuf *m_nextpkt;
196 SLIST_ENTRY(mbuf) m_slistpkt;
197 STAILQ_ENTRY(mbuf) m_stailqpkt;
199 caddr_t m_data; /* location of data */
200 int32_t m_len; /* amount of data in this mbuf */
201 uint32_t m_type:8, /* type of data in this mbuf */
202 m_flags:24; /* flags; see below */
203 #if !defined(__LP64__)
204 uint32_t m_pad; /* pad for 64bit alignment */
208 * A set of optional headers (packet header, external storage header)
209 * and internal data storage. Historically, these arrays were sized
210 * to MHLEN (space left after a packet header) and MLEN (space left
211 * after only a regular mbuf header); they are now variable size in
212 * order to support future work on variable-size mbufs.
216 struct pkthdr m_pkthdr; /* M_PKTHDR set */
218 struct m_ext m_ext; /* M_EXT set */
222 char m_dat[0]; /* !M_PKTHDR, !M_EXT */
227 * mbuf flags of global significance and layer crossing.
228 * Those of only protocol/layer specific significance are to be mapped
229 * to M_PROTO[1-12] and cleared at layer handoff boundaries.
230 * NB: Limited to the lower 24 bits.
232 #define M_EXT 0x00000001 /* has associated external storage */
233 #define M_PKTHDR 0x00000002 /* start of record */
234 #define M_EOR 0x00000004 /* end of record */
235 #define M_RDONLY 0x00000008 /* associated data is marked read-only */
236 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */
237 #define M_MCAST 0x00000020 /* send/received as link-level multicast */
238 #define M_PROMISC 0x00000040 /* packet was not for us */
239 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */
240 #define M_UNUSED_8 0x00000100 /* --available-- */
241 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */
243 #define M_PROTO1 0x00001000 /* protocol-specific */
244 #define M_PROTO2 0x00002000 /* protocol-specific */
245 #define M_PROTO3 0x00004000 /* protocol-specific */
246 #define M_PROTO4 0x00008000 /* protocol-specific */
247 #define M_PROTO5 0x00010000 /* protocol-specific */
248 #define M_PROTO6 0x00020000 /* protocol-specific */
249 #define M_PROTO7 0x00040000 /* protocol-specific */
250 #define M_PROTO8 0x00080000 /* protocol-specific */
251 #define M_PROTO9 0x00100000 /* protocol-specific */
252 #define M_PROTO10 0x00200000 /* protocol-specific */
253 #define M_PROTO11 0x00400000 /* protocol-specific */
254 #define M_PROTO12 0x00800000 /* protocol-specific */
257 * Flags to purge when crossing layers.
259 #define M_PROTOFLAGS \
260 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\
261 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12)
264 * Flags preserved when copying m_pkthdr.
266 #define M_COPYFLAGS \
267 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG| \
271 * Mbuf flag description for use with printf(9) %b identifier.
273 #define M_FLAG_BITS \
274 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \
275 "\7M_PROMISC\10M_VLANTAG"
276 #define M_FLAG_PROTOBITS \
277 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \
278 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \
279 "\27M_PROTO11\30M_PROTO12"
280 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS)
283 * Network interface cards are able to hash protocol fields (such as IPv4
284 * addresses and TCP port numbers) classify packets into flows. These flows
285 * can then be used to maintain ordering while delivering packets to the OS
286 * via parallel input queues, as well as to provide a stateless affinity
287 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set
288 * m_flag fields to indicate how the hash should be interpreted by the
291 * Most NICs support RSS, which provides ordering and explicit affinity, and
292 * use the hash m_flag bits to indicate what header fields were covered by
293 * the hash. M_HASHTYPE_OPAQUE can be set by non-RSS cards or configurations
294 * that provide an opaque flow identifier, allowing for ordering and
295 * distribution without explicit affinity.
297 /* Microsoft RSS standard hash types */
298 #define M_HASHTYPE_NONE 0
299 #define M_HASHTYPE_RSS_IPV4 1 /* IPv4 2-tuple */
300 #define M_HASHTYPE_RSS_TCP_IPV4 2 /* TCPv4 4-tuple */
301 #define M_HASHTYPE_RSS_IPV6 3 /* IPv6 2-tuple */
302 #define M_HASHTYPE_RSS_TCP_IPV6 4 /* TCPv6 4-tuple */
303 #define M_HASHTYPE_RSS_IPV6_EX 5 /* IPv6 2-tuple + ext hdrs */
304 #define M_HASHTYPE_RSS_TCP_IPV6_EX 6 /* TCPv6 4-tiple + ext hdrs */
305 /* Non-standard RSS hash types */
306 #define M_HASHTYPE_RSS_UDP_IPV4 7 /* IPv4 UDP 4-tuple */
307 #define M_HASHTYPE_RSS_UDP_IPV4_EX 8 /* IPv4 UDP 4-tuple + ext hdrs */
308 #define M_HASHTYPE_RSS_UDP_IPV6 9 /* IPv6 UDP 4-tuple */
309 #define M_HASHTYPE_RSS_UDP_IPV6_EX 10 /* IPv6 UDP 4-tuple + ext hdrs */
311 #define M_HASHTYPE_OPAQUE 255 /* ordering, not affinity */
313 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0)
314 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype)
315 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v))
316 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v))
319 * COS/QOS class and quality of service tags.
320 * It uses DSCP code points as base.
322 #define QOS_DSCP_CS0 0x00
323 #define QOS_DSCP_DEF QOS_DSCP_CS0
324 #define QOS_DSCP_CS1 0x20
325 #define QOS_DSCP_AF11 0x28
326 #define QOS_DSCP_AF12 0x30
327 #define QOS_DSCP_AF13 0x38
328 #define QOS_DSCP_CS2 0x40
329 #define QOS_DSCP_AF21 0x48
330 #define QOS_DSCP_AF22 0x50
331 #define QOS_DSCP_AF23 0x58
332 #define QOS_DSCP_CS3 0x60
333 #define QOS_DSCP_AF31 0x68
334 #define QOS_DSCP_AF32 0x70
335 #define QOS_DSCP_AF33 0x78
336 #define QOS_DSCP_CS4 0x80
337 #define QOS_DSCP_AF41 0x88
338 #define QOS_DSCP_AF42 0x90
339 #define QOS_DSCP_AF43 0x98
340 #define QOS_DSCP_CS5 0xa0
341 #define QOS_DSCP_EF 0xb8
342 #define QOS_DSCP_CS6 0xc0
343 #define QOS_DSCP_CS7 0xe0
346 * External mbuf storage buffer types.
348 #define EXT_CLUSTER 1 /* mbuf cluster */
349 #define EXT_SFBUF 2 /* sendfile(2)'s sf_buf */
350 #define EXT_JUMBOP 3 /* jumbo cluster page sized */
351 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */
352 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
353 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */
354 #define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */
355 #define EXT_SFBUF_NOCACHE 8 /* sendfile(2)'s sf_buf not to be cached */
357 #define EXT_VENDOR1 224 /* for vendor-internal use */
358 #define EXT_VENDOR2 225 /* for vendor-internal use */
359 #define EXT_VENDOR3 226 /* for vendor-internal use */
360 #define EXT_VENDOR4 227 /* for vendor-internal use */
362 #define EXT_EXP1 244 /* for experimental use */
363 #define EXT_EXP2 245 /* for experimental use */
364 #define EXT_EXP3 246 /* for experimental use */
365 #define EXT_EXP4 247 /* for experimental use */
367 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */
368 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */
369 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */
370 #define EXT_EXTREF 255 /* has externally maintained ext_cnt ptr */
373 * Flags for external mbuf buffer types.
374 * NB: limited to the lower 24 bits.
376 #define EXT_FLAG_EMBREF 0x000001 /* embedded ext_count */
377 #define EXT_FLAG_EXTREF 0x000002 /* external ext_cnt, notyet */
378 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */
380 #define EXT_FLAG_VENDOR1 0x010000 /* for vendor-internal use */
381 #define EXT_FLAG_VENDOR2 0x020000 /* for vendor-internal use */
382 #define EXT_FLAG_VENDOR3 0x040000 /* for vendor-internal use */
383 #define EXT_FLAG_VENDOR4 0x080000 /* for vendor-internal use */
385 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */
386 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */
387 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */
388 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */
391 * EXT flag description for use with printf(9) %b identifier.
393 #define EXT_FLAG_BITS \
394 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \
395 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \
396 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \
400 * External reference/free functions.
402 void sf_ext_free(void *, void *);
403 void sf_ext_free_nocache(void *, void *);
406 * Flags indicating checksum, segmentation and other offload work to be
407 * done, or already done, by hardware or lower layers. It is split into
408 * separate inbound and outbound flags.
410 * Outbound flags that are set by upper protocol layers requesting lower
411 * layers, or ideally the hardware, to perform these offloading tasks.
412 * For outbound packets this field and its flags can be directly tested
413 * against ifnet if_hwassist.
415 #define CSUM_IP 0x00000001 /* IP header checksum offload */
416 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */
417 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */
418 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */
419 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */
420 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */
422 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */
423 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */
424 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */
425 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */
426 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */
428 /* Inbound checksum support where the checksum was verified by hardware. */
429 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */
430 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */
431 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */
432 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */
433 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */
434 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */
435 #define CSUM_COALESED 0x40000000 /* contains merged segments */
438 * CSUM flag description for use with printf(9) %b identifier.
441 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \
443 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \
444 "\16CSUM_IP6_ISCSI" \
445 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \
446 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESED"
448 /* CSUM flags compatibility mappings. */
449 #define CSUM_IP_CHECKED CSUM_L3_CALC
450 #define CSUM_IP_VALID CSUM_L3_VALID
451 #define CSUM_DATA_VALID CSUM_L4_VALID
452 #define CSUM_PSEUDO_HDR CSUM_L4_CALC
453 #define CSUM_SCTP_VALID CSUM_L4_VALID
454 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP)
455 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */
456 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6)
457 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID
458 #define CSUM_TCP CSUM_IP_TCP
459 #define CSUM_UDP CSUM_IP_UDP
460 #define CSUM_SCTP CSUM_IP_SCTP
461 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO)
462 #define CSUM_UDP_IPV6 CSUM_IP6_UDP
463 #define CSUM_TCP_IPV6 CSUM_IP6_TCP
464 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP
467 * mbuf types describing the content of the mbuf (including external storage).
469 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
470 #define MT_DATA 1 /* dynamic (data) allocation */
471 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */
473 #define MT_VENDOR1 4 /* for vendor-internal use */
474 #define MT_VENDOR2 5 /* for vendor-internal use */
475 #define MT_VENDOR3 6 /* for vendor-internal use */
476 #define MT_VENDOR4 7 /* for vendor-internal use */
478 #define MT_SONAME 8 /* socket name */
480 #define MT_EXP1 9 /* for experimental use */
481 #define MT_EXP2 10 /* for experimental use */
482 #define MT_EXP3 11 /* for experimental use */
483 #define MT_EXP4 12 /* for experimental use */
485 #define MT_CONTROL 14 /* extra-data protocol message */
486 #define MT_OOBDATA 15 /* expedited data */
487 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
489 #define MT_NOINIT 255 /* Not a type but a flag to allocate
490 a non-initialized mbuf */
493 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to
494 * !_KERNEL so that monitoring tools can look up the zones with
497 #define MBUF_MEM_NAME "mbuf"
498 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster"
499 #define MBUF_PACKET_MEM_NAME "mbuf_packet"
500 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page"
501 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k"
502 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k"
503 #define MBUF_TAG_MEM_NAME "mbuf_tag"
504 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
509 #define MBUF_CHECKSLEEP(how) do { \
510 if (how == M_WAITOK) \
511 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \
512 "Sleeping in \"%s\"", __func__); \
515 #define MBUF_CHECKSLEEP(how)
519 * Network buffer allocation API
521 * The rest of it is defined in kern/kern_mbuf.c
523 extern uma_zone_t zone_mbuf;
524 extern uma_zone_t zone_clust;
525 extern uma_zone_t zone_pack;
526 extern uma_zone_t zone_jumbop;
527 extern uma_zone_t zone_jumbo9;
528 extern uma_zone_t zone_jumbo16;
530 void mb_dupcl(struct mbuf *, struct mbuf *);
531 void mb_free_ext(struct mbuf *);
532 void m_adj(struct mbuf *, int);
533 int m_apply(struct mbuf *, int, int,
534 int (*)(void *, void *, u_int), void *);
535 int m_append(struct mbuf *, int, c_caddr_t);
536 void m_cat(struct mbuf *, struct mbuf *);
537 void m_catpkt(struct mbuf *, struct mbuf *);
538 int m_clget(struct mbuf *m, int how);
539 void *m_cljget(struct mbuf *m, int how, int size);
540 struct mbuf *m_collapse(struct mbuf *, int, int);
541 void m_copyback(struct mbuf *, int, int, c_caddr_t);
542 void m_copydata(const struct mbuf *, int, int, caddr_t);
543 struct mbuf *m_copym(struct mbuf *, int, int, int);
544 struct mbuf *m_copypacket(struct mbuf *, int);
545 void m_copy_pkthdr(struct mbuf *, struct mbuf *);
546 struct mbuf *m_copyup(struct mbuf *, int, int);
547 struct mbuf *m_defrag(struct mbuf *, int);
548 void m_demote_pkthdr(struct mbuf *);
549 void m_demote(struct mbuf *, int, int);
550 struct mbuf *m_devget(char *, int, int, struct ifnet *,
551 void (*)(char *, caddr_t, u_int));
552 struct mbuf *m_dup(const struct mbuf *, int);
553 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
554 void m_extadd(struct mbuf *, caddr_t, u_int,
555 void (*)(struct mbuf *, void *, void *), void *, void *,
557 u_int m_fixhdr(struct mbuf *);
558 struct mbuf *m_fragment(struct mbuf *, int, int);
559 void m_freem(struct mbuf *);
560 struct mbuf *m_get2(int, int, short, int);
561 struct mbuf *m_getjcl(int, short, int, int);
562 struct mbuf *m_getm2(struct mbuf *, int, int, short, int);
563 struct mbuf *m_getptr(struct mbuf *, int, int *);
564 u_int m_length(struct mbuf *, struct mbuf **);
565 int m_mbuftouio(struct uio *, struct mbuf *, int);
566 void m_move_pkthdr(struct mbuf *, struct mbuf *);
567 int m_pkthdr_init(struct mbuf *, int);
568 struct mbuf *m_prepend(struct mbuf *, int, int);
569 void m_print(const struct mbuf *, int);
570 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
571 struct mbuf *m_pullup(struct mbuf *, int);
572 int m_sanity(struct mbuf *, int);
573 struct mbuf *m_split(struct mbuf *, int, int);
574 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int);
575 struct mbuf *m_unshare(struct mbuf *, int);
589 #if MJUMPAGESIZE != MCLBYTES
601 panic("%s: invalid cluster size %d", __func__, size);
608 * Associated an external reference counted buffer with an mbuf.
611 m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt,
612 void (*freef)(struct mbuf *, void *, void *), void *arg1, void *arg2)
615 KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__));
617 atomic_add_int(ref_cnt, 1);
619 m->m_ext.ext_buf = buf;
620 m->m_ext.ext_cnt = ref_cnt;
621 m->m_data = m->m_ext.ext_buf;
622 m->m_ext.ext_size = size;
623 m->m_ext.ext_free = freef;
624 m->m_ext.ext_arg1 = arg1;
625 m->m_ext.ext_arg2 = arg2;
626 m->m_ext.ext_type = EXT_EXTREF;
627 m->m_ext.ext_flags = 0;
630 static __inline uma_zone_t
639 #if MJUMPAGESIZE != MCLBYTES
651 panic("%s: invalid cluster size %d", __func__, size);
658 * Initialize an mbuf with linear storage.
660 * Inline because the consumer text overhead will be roughly the same to
661 * initialize or call a function with this many parameters and M_PKTHDR
662 * should go away with constant propagation for !MGETHDR.
665 m_init(struct mbuf *m, int how, short type, int flags)
671 m->m_data = m->m_dat;
675 if (flags & M_PKTHDR) {
676 if ((error = m_pkthdr_init(m, how)) != 0)
683 static __inline struct mbuf *
684 m_get(int how, short type)
690 return (uma_zalloc_arg(zone_mbuf, &args, how));
693 static __inline struct mbuf *
694 m_gethdr(int how, short type)
698 args.flags = M_PKTHDR;
700 return (uma_zalloc_arg(zone_mbuf, &args, how));
703 static __inline struct mbuf *
704 m_getcl(int how, short type, int flags)
710 return (uma_zalloc_arg(zone_pack, &args, how));
714 * XXX: m_cljset() is a dangerous API. One must attach only a new,
715 * unreferenced cluster to an mbuf(9). It is not possible to assert
716 * that, so care can be taken only by users of the API.
719 m_cljset(struct mbuf *m, void *cl, int type)
727 #if MJUMPAGESIZE != MCLBYTES
739 panic("%s: unknown cluster type %d", __func__, type);
743 m->m_data = m->m_ext.ext_buf = cl;
744 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
745 m->m_ext.ext_size = size;
746 m->m_ext.ext_type = type;
747 m->m_ext.ext_flags = EXT_FLAG_EMBREF;
748 m->m_ext.ext_count = 1;
753 m_chtype(struct mbuf *m, short new_type)
756 m->m_type = new_type;
760 m_clrprotoflags(struct mbuf *m)
764 m->m_flags &= ~M_PROTOFLAGS;
769 static __inline struct mbuf *
770 m_last(struct mbuf *m)
779 m_extrefcnt(struct mbuf *m)
782 KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing", __func__));
784 return ((m->m_ext.ext_flags & EXT_FLAG_EMBREF) ? m->m_ext.ext_count :
789 * mbuf, cluster, and external object allocation macros (for compatibility
792 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
793 #define MGET(m, how, type) ((m) = m_get((how), (type)))
794 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type)))
795 #define MCLGET(m, how) m_clget((m), (how))
796 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \
797 m_extadd((m), (caddr_t)(buf), (size), (free), (arg1), (arg2), \
799 #define m_getm(m, len, how, type) \
800 m_getm2((m), (len), (how), (type), M_PKTHDR)
803 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
804 * be both the local data payload, or an external buffer area, depending on
805 * whether M_EXT is set).
807 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \
808 (!(((m)->m_flags & M_EXT)) || \
809 (m_extrefcnt(m) == 1)))
811 /* Check if the supplied mbuf has a packet header, or else panic. */
812 #define M_ASSERTPKTHDR(m) \
813 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \
814 ("%s: no mbuf packet header!", __func__))
817 * Ensure that the supplied mbuf is a valid, non-free mbuf.
819 * XXX: Broken at the moment. Need some UMA magic to make it work again.
821 #define M_ASSERTVALID(m) \
822 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \
823 ("%s: attempted use of a free mbuf!", __func__))
826 * Return the address of the start of the buffer associated with an mbuf,
827 * handling external storage, packet-header mbufs, and regular data mbufs.
830 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \
831 ((m)->m_flags & M_PKTHDR) ? &(m)->m_pktdat[0] : \
835 * Return the size of the buffer associated with an mbuf, handling external
836 * storage, packet-header mbufs, and regular data mbufs.
839 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \
840 ((m)->m_flags & M_PKTHDR) ? MHLEN : \
844 * Set the m_data pointer of a newly allocated mbuf to place an object of the
845 * specified size at the end of the mbuf, longword aligned.
847 * NB: Historically, we had M_ALIGN(), MH_ALIGN(), and MEXT_ALIGN() as
848 * separate macros, each asserting that it was called at the proper moment.
849 * This required callers to themselves test the storage type and call the
850 * right one. Rather than require callers to be aware of those layout
851 * decisions, we centralize here.
854 m_align(struct mbuf *m, int len)
857 const char *msg = "%s: not a virgin mbuf";
861 KASSERT(m->m_data == M_START(m), (msg, __func__));
863 adjust = M_SIZE(m) - len;
864 m->m_data += adjust &~ (sizeof(long)-1);
867 #define M_ALIGN(m, len) m_align(m, len)
868 #define MH_ALIGN(m, len) m_align(m, len)
869 #define MEXT_ALIGN(m, len) m_align(m, len)
872 * Compute the amount of space available before the current start of data in
875 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
876 * of checking writability of the mbuf data area rests solely with the caller.
878 * NB: In previous versions, M_LEADINGSPACE() would only check M_WRITABLE()
879 * for mbufs with external storage. We now allow mbuf-embedded data to be
882 #define M_LEADINGSPACE(m) \
883 (M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0)
886 * Compute the amount of space available after the end of data in an mbuf.
888 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
889 * of checking writability of the mbuf data area rests solely with the caller.
891 * NB: In previous versions, M_TRAILINGSPACE() would only check M_WRITABLE()
892 * for mbufs with external storage. We now allow mbuf-embedded data to be
895 #define M_TRAILINGSPACE(m) \
897 ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len)) : 0)
900 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be
901 * allocated, how specifies whether to wait. If the allocation fails, the
902 * original mbuf chain is freed and m is set to NULL.
904 #define M_PREPEND(m, plen, how) do { \
905 struct mbuf **_mmp = &(m); \
906 struct mbuf *_mm = *_mmp; \
907 int _mplen = (plen); \
908 int __mhow = (how); \
910 MBUF_CHECKSLEEP(how); \
911 if (M_LEADINGSPACE(_mm) >= _mplen) { \
912 _mm->m_data -= _mplen; \
913 _mm->m_len += _mplen; \
915 _mm = m_prepend(_mm, _mplen, __mhow); \
916 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
917 _mm->m_pkthdr.len += _mplen; \
922 * Change mbuf to new type. This is a relatively expensive operation and
925 #define MCHTYPE(m, t) m_chtype((m), (t))
927 /* Length to m_copy to copy all. */
928 #define M_COPYALL 1000000000
930 /* Compatibility with 4.3. */
931 #define m_copy(m, o, l) m_copym((m), (o), (l), M_NOWAIT)
933 extern int max_datalen; /* MHLEN - max_hdr */
934 extern int max_hdr; /* Largest link + protocol header */
935 extern int max_linkhdr; /* Largest link-level header */
936 extern int max_protohdr; /* Largest protocol header */
937 extern int nmbclusters; /* Maximum number of clusters */
940 * Network packets may have annotations attached by affixing a list of
941 * "packet tags" to the pkthdr structure. Packet tags are dynamically
942 * allocated semi-opaque data structures that have a fixed header
943 * (struct m_tag) that specifies the size of the memory block and a
944 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique
945 * unsigned value used to identify a module or ABI. By convention this value
946 * is chosen as the date+time that the module is created, expressed as the
947 * number of seconds since the epoch (e.g., using date -u +'%s'). The type
948 * value is an ABI/module-specific value that identifies a particular
949 * annotation and is private to the module. For compatibility with systems
950 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
951 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
952 * compatibility shim functions and several tag types are defined below.
953 * Users that do not require compatibility should use a private cookie value
954 * so that packet tag-related definitions can be maintained privately.
956 * Note that the packet tag returned by m_tag_alloc has the default memory
957 * alignment implemented by malloc. To reference private data one can use a
960 * struct m_tag *mtag = m_tag_alloc(...);
961 * struct foo *p = (struct foo *)(mtag+1);
963 * if the alignment of struct m_tag is sufficient for referencing members of
964 * struct foo. Otherwise it is necessary to embed struct m_tag within the
965 * private data structure to insure proper alignment; e.g.,
971 * struct foo *p = (struct foo *) m_tag_alloc(...);
972 * struct m_tag *mtag = &p->tag;
976 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise
977 * tags are expected to ``vanish'' when they pass through a network
978 * interface. For most interfaces this happens normally as the tags are
979 * reclaimed when the mbuf is free'd. However in some special cases
980 * reclaiming must be done manually. An example is packets that pass through
981 * the loopback interface. Also, one must be careful to do this when
982 * ``turning around'' packets (e.g., icmp_reflect).
984 * To mark a tag persistent bit-or this flag in when defining the tag id.
985 * The tag will then be treated as described above.
987 #define MTAG_PERSISTENT 0x800
989 #define PACKET_TAG_NONE 0 /* Nadda */
991 /* Packet tags for use with PACKET_ABI_COMPAT. */
992 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
993 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
994 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
995 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
996 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */
997 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */
998 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */
999 #define PACKET_TAG_GIF 8 /* GIF processing done */
1000 #define PACKET_TAG_GRE 9 /* GRE processing done */
1001 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */
1002 #define PACKET_TAG_ENCAP 11 /* Encap. processing */
1003 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */
1004 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */
1005 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */
1006 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
1007 #define PACKET_TAG_DIVERT 17 /* divert info */
1008 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
1009 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */
1010 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */
1011 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */
1012 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */
1013 #define PACKET_TAG_CARP 28 /* CARP info */
1014 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */
1015 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */
1017 /* Specific cookies and tags. */
1019 /* Packet tag routines. */
1020 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
1021 void m_tag_delete(struct mbuf *, struct m_tag *);
1022 void m_tag_delete_chain(struct mbuf *, struct m_tag *);
1023 void m_tag_free_default(struct m_tag *);
1024 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
1025 struct m_tag *m_tag_copy(struct m_tag *, int);
1026 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
1027 void m_tag_delete_nonpersistent(struct mbuf *);
1030 * Initialize the list of tags associated with an mbuf.
1032 static __inline void
1033 m_tag_init(struct mbuf *m)
1036 SLIST_INIT(&m->m_pkthdr.tags);
1040 * Set up the contents of a tag. Note that this does not fill in the free
1041 * method; the caller is expected to do that.
1043 * XXX probably should be called m_tag_init, but that was already taken.
1045 static __inline void
1046 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
1051 t->m_tag_cookie = cookie;
1055 * Reclaim resources associated with a tag.
1057 static __inline void
1058 m_tag_free(struct m_tag *t)
1061 (*t->m_tag_free)(t);
1065 * Return the first tag associated with an mbuf.
1067 static __inline struct m_tag *
1068 m_tag_first(struct mbuf *m)
1071 return (SLIST_FIRST(&m->m_pkthdr.tags));
1075 * Return the next tag in the list of tags associated with an mbuf.
1077 static __inline struct m_tag *
1078 m_tag_next(struct mbuf *m __unused, struct m_tag *t)
1081 return (SLIST_NEXT(t, m_tag_link));
1085 * Prepend a tag to the list of tags associated with an mbuf.
1087 static __inline void
1088 m_tag_prepend(struct mbuf *m, struct m_tag *t)
1091 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
1095 * Unlink a tag from the list of tags associated with an mbuf.
1097 static __inline void
1098 m_tag_unlink(struct mbuf *m, struct m_tag *t)
1101 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
1104 /* These are for OpenBSD compatibility. */
1105 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
1107 static __inline struct m_tag *
1108 m_tag_get(int type, int length, int wait)
1110 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
1113 static __inline struct m_tag *
1114 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
1116 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
1117 m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
1120 static __inline struct mbuf *
1121 m_free(struct mbuf *m)
1123 struct mbuf *n = m->m_next;
1125 if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE))
1126 m_tag_delete_chain(m, NULL);
1127 if (m->m_flags & M_EXT)
1129 else if ((m->m_flags & M_NOFREE) == 0)
1130 uma_zfree(zone_mbuf, m);
1135 rt_m_getfib(struct mbuf *m)
1137 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf."));
1138 return (m->m_pkthdr.fibnum);
1141 #define M_GETFIB(_m) rt_m_getfib(_m)
1143 #define M_SETFIB(_m, _fib) do { \
1144 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \
1145 ((_m)->m_pkthdr.fibnum) = (_fib); \
1148 /* flags passed as first argument for "m_ether_tcpip_hash()" */
1149 #define MBUF_HASHFLAG_L2 (1 << 2)
1150 #define MBUF_HASHFLAG_L3 (1 << 3)
1151 #define MBUF_HASHFLAG_L4 (1 << 4)
1153 /* mbuf hashing helper routines */
1154 uint32_t m_ether_tcpip_hash_init(void);
1155 uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, const uint32_t);
1157 #ifdef MBUF_PROFILING
1158 void m_profile(struct mbuf *m);
1159 #define M_PROFILE(m) m_profile(m)
1161 #define M_PROFILE(m)
1165 STAILQ_HEAD(, mbuf) mq_head;
1171 mbufq_init(struct mbufq *mq, int maxlen)
1174 STAILQ_INIT(&mq->mq_head);
1175 mq->mq_maxlen = maxlen;
1179 static inline struct mbuf *
1180 mbufq_flush(struct mbufq *mq)
1184 m = STAILQ_FIRST(&mq->mq_head);
1185 STAILQ_INIT(&mq->mq_head);
1191 mbufq_drain(struct mbufq *mq)
1195 n = mbufq_flush(mq);
1196 while ((m = n) != NULL) {
1197 n = STAILQ_NEXT(m, m_stailqpkt);
1202 static inline struct mbuf *
1203 mbufq_first(const struct mbufq *mq)
1206 return (STAILQ_FIRST(&mq->mq_head));
1209 static inline struct mbuf *
1210 mbufq_last(const struct mbufq *mq)
1213 return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
1217 mbufq_full(const struct mbufq *mq)
1220 return (mq->mq_len >= mq->mq_maxlen);
1224 mbufq_len(const struct mbufq *mq)
1227 return (mq->mq_len);
1231 mbufq_enqueue(struct mbufq *mq, struct mbuf *m)
1236 STAILQ_INSERT_TAIL(&mq->mq_head, m, m_stailqpkt);
1241 static inline struct mbuf *
1242 mbufq_dequeue(struct mbufq *mq)
1246 m = STAILQ_FIRST(&mq->mq_head);
1248 STAILQ_REMOVE_HEAD(&mq->mq_head, m_stailqpkt);
1249 m->m_nextpkt = NULL;
1256 mbufq_prepend(struct mbufq *mq, struct mbuf *m)
1259 STAILQ_INSERT_HEAD(&mq->mq_head, m, m_stailqpkt);
1262 #endif /* _KERNEL */
1263 #endif /* !_SYS_MBUF_H_ */