The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mbuf.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1988, 1993
    3  *      The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)mbuf.h      8.5 (Berkeley) 2/19/95
   31  * $FreeBSD: releng/9.0/sys/sys/mbuf.h 223637 2011-06-28 11:57:25Z bz $
   32  */
   33 
   34 #ifndef _SYS_MBUF_H_
   35 #define _SYS_MBUF_H_
   36 
   37 /* XXX: These includes suck. Sorry! */
   38 #include <sys/queue.h>
   39 #ifdef _KERNEL
   40 #include <sys/systm.h>
   41 #include <vm/uma.h>
   42 #ifdef WITNESS
   43 #include <sys/lock.h>
   44 #endif
   45 #endif
   46 
   47 /*
   48  * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead.
   49  * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in
   50  * sys/param.h), which has no additional overhead and is used instead of the
   51  * internal data area; this is done when at least MINCLSIZE of data must be
   52  * stored.  Additionally, it is possible to allocate a separate buffer
   53  * externally and attach it to the mbuf in a way similar to that of mbuf
   54  * clusters.
   55  */
   56 #define MLEN            (MSIZE - sizeof(struct m_hdr))  /* normal data len */
   57 #define MHLEN           (MLEN - sizeof(struct pkthdr))  /* data len w/pkthdr */
   58 #define MINCLSIZE       (MHLEN + 1)     /* smallest amount to put in cluster */
   59 #define M_MAXCOMPRESS   (MHLEN / 2)     /* max amount to copy for compression */
   60 
   61 #ifdef _KERNEL
   62 /*-
   63  * Macro for type conversion: convert mbuf pointer to data pointer of correct
   64  * type:
   65  *
   66  * mtod(m, t)   -- Convert mbuf pointer to data pointer of correct type.
   67  */
   68 #define mtod(m, t)      ((t)((m)->m_data))
   69 
   70 /*
   71  * Argument structure passed to UMA routines during mbuf and packet
   72  * allocations.
   73  */
   74 struct mb_args {
   75         int     flags;  /* Flags for mbuf being allocated */
   76         short   type;   /* Type of mbuf being allocated */
   77 };
   78 #endif /* _KERNEL */
   79 
   80 #if defined(__LP64__)
   81 #define M_HDR_PAD    6
   82 #else
   83 #define M_HDR_PAD    2
   84 #endif
   85 
   86 /*
   87  * Header present at the beginning of every mbuf.
   88  */
   89 struct m_hdr {
   90         struct mbuf     *mh_next;       /* next buffer in chain */
   91         struct mbuf     *mh_nextpkt;    /* next chain in queue/record */
   92         caddr_t          mh_data;       /* location of data */
   93         int              mh_len;        /* amount of data in this mbuf */
   94         int              mh_flags;      /* flags; see below */
   95         short            mh_type;       /* type of data in this mbuf */
   96         uint8_t          pad[M_HDR_PAD];/* word align                  */
   97 };
   98 
   99 /*
  100  * Packet tag structure (see below for details).
  101  */
  102 struct m_tag {
  103         SLIST_ENTRY(m_tag)      m_tag_link;     /* List of packet tags */
  104         u_int16_t               m_tag_id;       /* Tag ID */
  105         u_int16_t               m_tag_len;      /* Length of data */
  106         u_int32_t               m_tag_cookie;   /* ABI/Module ID */
  107         void                    (*m_tag_free)(struct m_tag *);
  108 };
  109 
  110 /*
  111  * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
  112  */
  113 struct pkthdr {
  114         struct ifnet    *rcvif;         /* rcv interface */
  115         /* variables for ip and tcp reassembly */
  116         void            *header;        /* pointer to packet header */
  117         int              len;           /* total packet length */
  118         uint32_t         flowid;        /* packet's 4-tuple system 
  119                                          * flow identifier
  120                                          */
  121         /* variables for hardware checksum */
  122         int              csum_flags;    /* flags regarding checksum */
  123         int              csum_data;     /* data field used by csum routines */
  124         u_int16_t        tso_segsz;     /* TSO segment size */
  125         union {
  126                 u_int16_t vt_vtag;      /* Ethernet 802.1p+q vlan tag */
  127                 u_int16_t vt_nrecs;     /* # of IGMPv3 records in this chain */
  128         } PH_vt;
  129         SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
  130 };
  131 #define ether_vtag      PH_vt.vt_vtag
  132 
  133 /*
  134  * Description of external storage mapped into mbuf; valid only if M_EXT is
  135  * set.
  136  */
  137 struct m_ext {
  138         caddr_t          ext_buf;       /* start of buffer */
  139         void            (*ext_free)     /* free routine if not the usual */
  140                             (void *, void *);
  141         void            *ext_arg1;      /* optional argument pointer */
  142         void            *ext_arg2;      /* optional argument pointer */
  143         u_int            ext_size;      /* size of buffer, for ext_free */
  144         volatile u_int  *ref_cnt;       /* pointer to ref count info */
  145         int              ext_type;      /* type of external storage */
  146 };
  147 
  148 /*
  149  * The core of the mbuf object along with some shortcut defines for practical
  150  * purposes.
  151  */
  152 struct mbuf {
  153         struct m_hdr    m_hdr;
  154         union {
  155                 struct {
  156                         struct pkthdr   MH_pkthdr;      /* M_PKTHDR set */
  157                         union {
  158                                 struct m_ext    MH_ext; /* M_EXT set */
  159                                 char            MH_databuf[MHLEN];
  160                         } MH_dat;
  161                 } MH;
  162                 char    M_databuf[MLEN];                /* !M_PKTHDR, !M_EXT */
  163         } M_dat;
  164 };
  165 #define m_next          m_hdr.mh_next
  166 #define m_len           m_hdr.mh_len
  167 #define m_data          m_hdr.mh_data
  168 #define m_type          m_hdr.mh_type
  169 #define m_flags         m_hdr.mh_flags
  170 #define m_nextpkt       m_hdr.mh_nextpkt
  171 #define m_act           m_nextpkt
  172 #define m_pkthdr        M_dat.MH.MH_pkthdr
  173 #define m_ext           M_dat.MH.MH_dat.MH_ext
  174 #define m_pktdat        M_dat.MH.MH_dat.MH_databuf
  175 #define m_dat           M_dat.M_databuf
  176 
  177 /*
  178  * mbuf flags.
  179  */
  180 #define M_EXT           0x00000001 /* has associated external storage */
  181 #define M_PKTHDR        0x00000002 /* start of record */
  182 #define M_EOR           0x00000004 /* end of record */
  183 #define M_RDONLY        0x00000008 /* associated data is marked read-only */
  184 #define M_PROTO1        0x00000010 /* protocol-specific */
  185 #define M_PROTO2        0x00000020 /* protocol-specific */
  186 #define M_PROTO3        0x00000040 /* protocol-specific */
  187 #define M_PROTO4        0x00000080 /* protocol-specific */
  188 #define M_PROTO5        0x00000100 /* protocol-specific */
  189 #define M_BCAST         0x00000200 /* send/received as link-level broadcast */
  190 #define M_MCAST         0x00000400 /* send/received as link-level multicast */
  191 #define M_FRAG          0x00000800 /* packet is a fragment of a larger packet */
  192 #define M_FIRSTFRAG     0x00001000 /* packet is first fragment */
  193 #define M_LASTFRAG      0x00002000 /* packet is last fragment */
  194 #define M_SKIP_FIREWALL 0x00004000 /* skip firewall processing */
  195 #define M_FREELIST      0x00008000 /* mbuf is on the free list */
  196 #define M_VLANTAG       0x00010000 /* ether_vtag is valid */
  197 #define M_PROMISC       0x00020000 /* packet was not for us */
  198 #define M_NOFREE        0x00040000 /* do not free mbuf, embedded in cluster */
  199 #define M_PROTO6        0x00080000 /* protocol-specific */
  200 #define M_PROTO7        0x00100000 /* protocol-specific */
  201 #define M_PROTO8        0x00200000 /* protocol-specific */
  202 #define M_FLOWID        0x00400000 /* deprecated: flowid is valid */
  203 #define M_HASHTYPEBITS  0x0F000000 /* mask of bits holding flowid hash type */
  204 
  205 /*
  206  * For RELENG_{6,7} steal these flags for limited multiple routing table
  207  * support. In RELENG_8 and beyond, use just one flag and a tag.
  208  */
  209 #define M_FIB           0xF0000000 /* steal some bits to store fib number. */
  210 
  211 #define M_NOTIFICATION  M_PROTO5    /* SCTP notification */
  212 
  213 /*
  214  * Flags to purge when crossing layers.
  215  */
  216 #define M_PROTOFLAGS \
  217     (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8)
  218 
  219 /*
  220  * Network interface cards are able to hash protocol fields (such as IPv4
  221  * addresses and TCP port numbers) classify packets into flows.  These flows
  222  * can then be used to maintain ordering while delivering packets to the OS
  223  * via parallel input queues, as well as to provide a stateless affinity
  224  * model.  NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set
  225  * m_flag fields to indicate how the hash should be interpreted by the
  226  * network stack.
  227  *
  228  * Most NICs support RSS, which provides ordering and explicit affinity, and
  229  * use the hash m_flag bits to indicate what header fields were covered by
  230  * the hash.  M_HASHTYPE_OPAQUE can be set by non-RSS cards or configurations
  231  * that provide an opaque flow identifier, allowing for ordering and
  232  * distribution without explicit affinity.
  233  */
  234 #define M_HASHTYPE_SHIFT                24
  235 #define M_HASHTYPE_NONE                 0x0
  236 #define M_HASHTYPE_RSS_IPV4             0x1     /* IPv4 2-tuple */
  237 #define M_HASHTYPE_RSS_TCP_IPV4         0x2     /* TCPv4 4-tuple */
  238 #define M_HASHTYPE_RSS_IPV6             0x3     /* IPv6 2-tuple */
  239 #define M_HASHTYPE_RSS_TCP_IPV6         0x4     /* TCPv6 4-tuple */
  240 #define M_HASHTYPE_RSS_IPV6_EX          0x5     /* IPv6 2-tuple + ext hdrs */
  241 #define M_HASHTYPE_RSS_TCP_IPV6_EX      0x6     /* TCPv6 4-tiple + ext hdrs */
  242 #define M_HASHTYPE_OPAQUE               0xf     /* ordering, not affinity */
  243 
  244 #define M_HASHTYPE_CLEAR(m)     (m)->m_flags &= ~(M_HASHTYPEBITS)
  245 #define M_HASHTYPE_GET(m)       (((m)->m_flags & M_HASHTYPEBITS) >> \
  246                                     M_HASHTYPE_SHIFT)
  247 #define M_HASHTYPE_SET(m, v)    do {                                    \
  248         (m)->m_flags &= ~M_HASHTYPEBITS;                                \
  249         (m)->m_flags |= ((v) << M_HASHTYPE_SHIFT);                      \
  250 } while (0)
  251 #define M_HASHTYPE_TEST(m, v)   (M_HASHTYPE_GET(m) == (v))
  252 
  253 /*
  254  * Flags preserved when copying m_pkthdr.
  255  */
  256 #define M_COPYFLAGS \
  257     (M_PKTHDR|M_EOR|M_RDONLY|M_PROTOFLAGS|M_SKIP_FIREWALL|M_BCAST|M_MCAST|\
  258      M_FRAG|M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG|M_PROMISC|M_FIB|M_HASHTYPEBITS)
  259 
  260 /*
  261  * External buffer types: identify ext_buf type.
  262  */
  263 #define EXT_CLUSTER     1       /* mbuf cluster */
  264 #define EXT_SFBUF       2       /* sendfile(2)'s sf_bufs */
  265 #define EXT_JUMBOP      3       /* jumbo cluster 4096 bytes */
  266 #define EXT_JUMBO9      4       /* jumbo cluster 9216 bytes */
  267 #define EXT_JUMBO16     5       /* jumbo cluster 16184 bytes */
  268 #define EXT_PACKET      6       /* mbuf+cluster from packet zone */
  269 #define EXT_MBUF        7       /* external mbuf reference (M_IOVEC) */
  270 #define EXT_NET_DRV     100     /* custom ext_buf provided by net driver(s) */
  271 #define EXT_MOD_TYPE    200     /* custom module's ext_buf type */
  272 #define EXT_DISPOSABLE  300     /* can throw this buffer away w/page flipping */
  273 #define EXT_EXTREF      400     /* has externally maintained ref_cnt ptr */
  274 
  275 /*
  276  * Flags indicating hw checksum support and sw checksum requirements.  This
  277  * field can be directly tested against if_data.ifi_hwassist.
  278  */
  279 #define CSUM_IP                 0x0001          /* will csum IP */
  280 #define CSUM_TCP                0x0002          /* will csum TCP */
  281 #define CSUM_UDP                0x0004          /* will csum UDP */
  282 #define CSUM_IP_FRAGS           0x0008          /* will csum IP fragments */
  283 #define CSUM_FRAGMENT           0x0010          /* will do IP fragmentation */
  284 #define CSUM_TSO                0x0020          /* will do TSO */
  285 #define CSUM_SCTP               0x0040          /* will csum SCTP */
  286 
  287 #define CSUM_IP_CHECKED         0x0100          /* did csum IP */
  288 #define CSUM_IP_VALID           0x0200          /*   ... the csum is valid */
  289 #define CSUM_DATA_VALID         0x0400          /* csum_data field is valid */
  290 #define CSUM_PSEUDO_HDR         0x0800          /* csum_data has pseudo hdr */
  291 #define CSUM_SCTP_VALID         0x1000          /* SCTP checksum is valid */
  292 
  293 #define CSUM_DELAY_DATA         (CSUM_TCP | CSUM_UDP)
  294 #define CSUM_DELAY_IP           (CSUM_IP)       /* XXX add ipv6 here too? */
  295 
  296 /*
  297  * mbuf types.
  298  */
  299 #define MT_NOTMBUF      0       /* USED INTERNALLY ONLY! Object is not mbuf */
  300 #define MT_DATA         1       /* dynamic (data) allocation */
  301 #define MT_HEADER       MT_DATA /* packet header, use M_PKTHDR instead */
  302 #define MT_SONAME       8       /* socket name */
  303 #define MT_CONTROL      14      /* extra-data protocol message */
  304 #define MT_OOBDATA      15      /* expedited data  */
  305 #define MT_NTYPES       16      /* number of mbuf types for mbtypes[] */
  306 
  307 #define MT_NOINIT       255     /* Not a type but a flag to allocate
  308                                    a non-initialized mbuf */
  309 
  310 #define MB_NOTAGS       0x1UL   /* no tags attached to mbuf */
  311 
  312 /*
  313  * General mbuf allocator statistics structure.
  314  *
  315  * Many of these statistics are no longer used; we instead track many
  316  * allocator statistics through UMA's built in statistics mechanism.
  317  */
  318 struct mbstat {
  319         u_long  m_mbufs;        /* XXX */
  320         u_long  m_mclusts;      /* XXX */
  321 
  322         u_long  m_drain;        /* times drained protocols for space */
  323         u_long  m_mcfail;       /* XXX: times m_copym failed */
  324         u_long  m_mpfail;       /* XXX: times m_pullup failed */
  325         u_long  m_msize;        /* length of an mbuf */
  326         u_long  m_mclbytes;     /* length of an mbuf cluster */
  327         u_long  m_minclsize;    /* min length of data to allocate a cluster */
  328         u_long  m_mlen;         /* length of data in an mbuf */
  329         u_long  m_mhlen;        /* length of data in a header mbuf */
  330 
  331         /* Number of mbtypes (gives # elems in mbtypes[] array) */
  332         short   m_numtypes;
  333 
  334         /* XXX: Sendfile stats should eventually move to their own struct */
  335         u_long  sf_iocnt;       /* times sendfile had to do disk I/O */
  336         u_long  sf_allocfail;   /* times sfbuf allocation failed */
  337         u_long  sf_allocwait;   /* times sfbuf allocation had to wait */
  338 };
  339 
  340 /*
  341  * Flags specifying how an allocation should be made.
  342  *
  343  * The flag to use is as follows:
  344  * - M_DONTWAIT or M_NOWAIT from an interrupt handler to not block allocation.
  345  * - M_WAIT or M_WAITOK from wherever it is safe to block.
  346  *
  347  * M_DONTWAIT/M_NOWAIT means that we will not block the thread explicitly and
  348  * if we cannot allocate immediately we may return NULL, whereas
  349  * M_WAIT/M_WAITOK means that if we cannot allocate resources we
  350  * will block until they are available, and thus never return NULL.
  351  *
  352  * XXX Eventually just phase this out to use M_WAITOK/M_NOWAIT.
  353  */
  354 #define MBTOM(how)      (how)
  355 #define M_DONTWAIT      M_NOWAIT
  356 #define M_TRYWAIT       M_WAITOK
  357 #define M_WAIT          M_WAITOK
  358 
  359 /*
  360  * String names of mbuf-related UMA(9) and malloc(9) types.  Exposed to
  361  * !_KERNEL so that monitoring tools can look up the zones with
  362  * libmemstat(3).
  363  */
  364 #define MBUF_MEM_NAME           "mbuf"
  365 #define MBUF_CLUSTER_MEM_NAME   "mbuf_cluster"
  366 #define MBUF_PACKET_MEM_NAME    "mbuf_packet"
  367 #define MBUF_JUMBOP_MEM_NAME    "mbuf_jumbo_page"
  368 #define MBUF_JUMBO9_MEM_NAME    "mbuf_jumbo_9k"
  369 #define MBUF_JUMBO16_MEM_NAME   "mbuf_jumbo_16k"
  370 #define MBUF_TAG_MEM_NAME       "mbuf_tag"
  371 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
  372 
  373 #ifdef _KERNEL
  374 
  375 #ifdef WITNESS
  376 #define MBUF_CHECKSLEEP(how) do {                                       \
  377         if (how == M_WAITOK)                                            \
  378                 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,         \
  379                     "Sleeping in \"%s\"", __func__);                    \
  380 } while (0)
  381 #else
  382 #define MBUF_CHECKSLEEP(how)
  383 #endif
  384 
  385 /*
  386  * Network buffer allocation API
  387  *
  388  * The rest of it is defined in kern/kern_mbuf.c
  389  */
  390 
  391 extern uma_zone_t       zone_mbuf;
  392 extern uma_zone_t       zone_clust;
  393 extern uma_zone_t       zone_pack;
  394 extern uma_zone_t       zone_jumbop;
  395 extern uma_zone_t       zone_jumbo9;
  396 extern uma_zone_t       zone_jumbo16;
  397 extern uma_zone_t       zone_ext_refcnt;
  398 
  399 static __inline struct mbuf     *m_getcl(int how, short type, int flags);
  400 static __inline struct mbuf     *m_get(int how, short type);
  401 static __inline struct mbuf     *m_gethdr(int how, short type);
  402 static __inline struct mbuf     *m_getjcl(int how, short type, int flags,
  403                                     int size);
  404 static __inline struct mbuf     *m_getclr(int how, short type); /* XXX */
  405 static __inline int              m_init(struct mbuf *m, uma_zone_t zone,
  406                                     int size, int how, short type, int flags);
  407 static __inline struct mbuf     *m_free(struct mbuf *m);
  408 static __inline void             m_clget(struct mbuf *m, int how);
  409 static __inline void            *m_cljget(struct mbuf *m, int how, int size);
  410 static __inline void             m_chtype(struct mbuf *m, short new_type);
  411 void                             mb_free_ext(struct mbuf *);
  412 static __inline struct mbuf     *m_last(struct mbuf *m);
  413 int                              m_pkthdr_init(struct mbuf *m, int how);
  414 
  415 static __inline int
  416 m_gettype(int size)
  417 {
  418         int type;
  419         
  420         switch (size) {
  421         case MSIZE:
  422                 type = EXT_MBUF;
  423                 break;
  424         case MCLBYTES:
  425                 type = EXT_CLUSTER;
  426                 break;
  427 #if MJUMPAGESIZE != MCLBYTES
  428         case MJUMPAGESIZE:
  429                 type = EXT_JUMBOP;
  430                 break;
  431 #endif
  432         case MJUM9BYTES:
  433                 type = EXT_JUMBO9;
  434                 break;
  435         case MJUM16BYTES:
  436                 type = EXT_JUMBO16;
  437                 break;
  438         default:
  439                 panic("%s: m_getjcl: invalid cluster size", __func__);
  440         }
  441 
  442         return (type);
  443 }
  444 
  445 static __inline uma_zone_t
  446 m_getzone(int size)
  447 {
  448         uma_zone_t zone;
  449         
  450         switch (size) {
  451         case MSIZE:
  452                 zone = zone_mbuf;
  453                 break;
  454         case MCLBYTES:
  455                 zone = zone_clust;
  456                 break;
  457 #if MJUMPAGESIZE != MCLBYTES
  458         case MJUMPAGESIZE:
  459                 zone = zone_jumbop;
  460                 break;
  461 #endif
  462         case MJUM9BYTES:
  463                 zone = zone_jumbo9;
  464                 break;
  465         case MJUM16BYTES:
  466                 zone = zone_jumbo16;
  467                 break;
  468         default:
  469                 panic("%s: m_getjcl: invalid cluster type", __func__);
  470         }
  471 
  472         return (zone);
  473 }
  474 
  475 /*
  476  * Initialize an mbuf with linear storage.
  477  *
  478  * Inline because the consumer text overhead will be roughly the same to
  479  * initialize or call a function with this many parameters and M_PKTHDR
  480  * should go away with constant propagation for !MGETHDR.
  481  */
  482 static __inline int
  483 m_init(struct mbuf *m, uma_zone_t zone, int size, int how, short type,
  484     int flags)
  485 {
  486         int error;
  487 
  488         m->m_next = NULL;
  489         m->m_nextpkt = NULL;
  490         m->m_data = m->m_dat;
  491         m->m_len = 0;
  492         m->m_flags = flags;
  493         m->m_type = type;
  494         if (flags & M_PKTHDR) {
  495                 if ((error = m_pkthdr_init(m, how)) != 0)
  496                         return (error);
  497         }
  498 
  499         return (0);
  500 }
  501 
  502 static __inline struct mbuf *
  503 m_get(int how, short type)
  504 {
  505         struct mb_args args;
  506 
  507         args.flags = 0;
  508         args.type = type;
  509         return ((struct mbuf *)(uma_zalloc_arg(zone_mbuf, &args, how)));
  510 }
  511 
  512 /*
  513  * XXX This should be deprecated, very little use.
  514  */
  515 static __inline struct mbuf *
  516 m_getclr(int how, short type)
  517 {
  518         struct mbuf *m;
  519         struct mb_args args;
  520 
  521         args.flags = 0;
  522         args.type = type;
  523         m = uma_zalloc_arg(zone_mbuf, &args, how);
  524         if (m != NULL)
  525                 bzero(m->m_data, MLEN);
  526         return (m);
  527 }
  528 
  529 static __inline struct mbuf *
  530 m_gethdr(int how, short type)
  531 {
  532         struct mb_args args;
  533 
  534         args.flags = M_PKTHDR;
  535         args.type = type;
  536         return ((struct mbuf *)(uma_zalloc_arg(zone_mbuf, &args, how)));
  537 }
  538 
  539 static __inline struct mbuf *
  540 m_getcl(int how, short type, int flags)
  541 {
  542         struct mb_args args;
  543 
  544         args.flags = flags;
  545         args.type = type;
  546         return ((struct mbuf *)(uma_zalloc_arg(zone_pack, &args, how)));
  547 }
  548 
  549 /*
  550  * m_getjcl() returns an mbuf with a cluster of the specified size attached.
  551  * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
  552  *
  553  * XXX: This is rather large, should be real function maybe.
  554  */
  555 static __inline struct mbuf *
  556 m_getjcl(int how, short type, int flags, int size)
  557 {
  558         struct mb_args args;
  559         struct mbuf *m, *n;
  560         uma_zone_t zone;
  561 
  562         if (size == MCLBYTES)
  563                 return m_getcl(how, type, flags);
  564 
  565         args.flags = flags;
  566         args.type = type;
  567 
  568         m = uma_zalloc_arg(zone_mbuf, &args, how);
  569         if (m == NULL)
  570                 return (NULL);
  571 
  572         zone = m_getzone(size);
  573         n = uma_zalloc_arg(zone, m, how);
  574         if (n == NULL) {
  575                 uma_zfree(zone_mbuf, m);
  576                 return (NULL);
  577         }
  578         return (m);
  579 }
  580 
  581 static __inline void
  582 m_free_fast(struct mbuf *m)
  583 {
  584 #ifdef INVARIANTS
  585         if (m->m_flags & M_PKTHDR)
  586                 KASSERT(SLIST_EMPTY(&m->m_pkthdr.tags), ("doing fast free of mbuf with tags"));
  587 #endif
  588         
  589         uma_zfree_arg(zone_mbuf, m, (void *)MB_NOTAGS);
  590 }
  591 
  592 static __inline struct mbuf *
  593 m_free(struct mbuf *m)
  594 {
  595         struct mbuf *n = m->m_next;
  596 
  597         if (m->m_flags & M_EXT)
  598                 mb_free_ext(m);
  599         else if ((m->m_flags & M_NOFREE) == 0)
  600                 uma_zfree(zone_mbuf, m);
  601         return (n);
  602 }
  603 
  604 static __inline void
  605 m_clget(struct mbuf *m, int how)
  606 {
  607 
  608         if (m->m_flags & M_EXT)
  609                 printf("%s: %p mbuf already has cluster\n", __func__, m);
  610         m->m_ext.ext_buf = (char *)NULL;
  611         uma_zalloc_arg(zone_clust, m, how);
  612         /*
  613          * On a cluster allocation failure, drain the packet zone and retry,
  614          * we might be able to loosen a few clusters up on the drain.
  615          */
  616         if ((how & M_NOWAIT) && (m->m_ext.ext_buf == NULL)) {
  617                 zone_drain(zone_pack);
  618                 uma_zalloc_arg(zone_clust, m, how);
  619         }
  620 }
  621 
  622 /*
  623  * m_cljget() is different from m_clget() as it can allocate clusters without
  624  * attaching them to an mbuf.  In that case the return value is the pointer
  625  * to the cluster of the requested size.  If an mbuf was specified, it gets
  626  * the cluster attached to it and the return value can be safely ignored.
  627  * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
  628  */
  629 static __inline void *
  630 m_cljget(struct mbuf *m, int how, int size)
  631 {
  632         uma_zone_t zone;
  633 
  634         if (m && m->m_flags & M_EXT)
  635                 printf("%s: %p mbuf already has cluster\n", __func__, m);
  636         if (m != NULL)
  637                 m->m_ext.ext_buf = NULL;
  638 
  639         zone = m_getzone(size);
  640         return (uma_zalloc_arg(zone, m, how));
  641 }
  642 
  643 static __inline void
  644 m_cljset(struct mbuf *m, void *cl, int type)
  645 {
  646         uma_zone_t zone;
  647         int size;
  648         
  649         switch (type) {
  650         case EXT_CLUSTER:
  651                 size = MCLBYTES;
  652                 zone = zone_clust;
  653                 break;
  654 #if MJUMPAGESIZE != MCLBYTES
  655         case EXT_JUMBOP:
  656                 size = MJUMPAGESIZE;
  657                 zone = zone_jumbop;
  658                 break;
  659 #endif
  660         case EXT_JUMBO9:
  661                 size = MJUM9BYTES;
  662                 zone = zone_jumbo9;
  663                 break;
  664         case EXT_JUMBO16:
  665                 size = MJUM16BYTES;
  666                 zone = zone_jumbo16;
  667                 break;
  668         default:
  669                 panic("unknown cluster type");
  670                 break;
  671         }
  672 
  673         m->m_data = m->m_ext.ext_buf = cl;
  674         m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
  675         m->m_ext.ext_size = size;
  676         m->m_ext.ext_type = type;
  677         m->m_ext.ref_cnt = uma_find_refcnt(zone, cl);
  678         m->m_flags |= M_EXT;
  679 
  680 }
  681 
  682 static __inline void
  683 m_chtype(struct mbuf *m, short new_type)
  684 {
  685 
  686         m->m_type = new_type;
  687 }
  688 
  689 static __inline struct mbuf *
  690 m_last(struct mbuf *m)
  691 {
  692 
  693         while (m->m_next)
  694                 m = m->m_next;
  695         return (m);
  696 }
  697 
  698 extern void (*m_addr_chg_pf_p)(struct mbuf *m);
  699 
  700 static __inline void 
  701 m_addr_changed(struct mbuf *m)
  702 {
  703 
  704         if (m_addr_chg_pf_p)
  705                 m_addr_chg_pf_p(m);
  706 }
  707 
  708 /*
  709  * mbuf, cluster, and external object allocation macros (for compatibility
  710  * purposes).
  711  */
  712 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
  713 #define MGET(m, how, type)      ((m) = m_get((how), (type)))
  714 #define MGETHDR(m, how, type)   ((m) = m_gethdr((how), (type)))
  715 #define MCLGET(m, how)          m_clget((m), (how))
  716 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type)            \
  717     m_extadd((m), (caddr_t)(buf), (size), (free),(arg1),(arg2),(flags), (type))
  718 #define m_getm(m, len, how, type)                                       \
  719     m_getm2((m), (len), (how), (type), M_PKTHDR)
  720 
  721 /*
  722  * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
  723  * be both the local data payload, or an external buffer area, depending on
  724  * whether M_EXT is set).
  725  */
  726 #define M_WRITABLE(m)   (!((m)->m_flags & M_RDONLY) &&                  \
  727                          (!(((m)->m_flags & M_EXT)) ||                  \
  728                          (*((m)->m_ext.ref_cnt) == 1)) )                \
  729 
  730 /* Check if the supplied mbuf has a packet header, or else panic. */
  731 #define M_ASSERTPKTHDR(m)                                               \
  732         KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR,                 \
  733             ("%s: no mbuf packet header!", __func__))
  734 
  735 /*
  736  * Ensure that the supplied mbuf is a valid, non-free mbuf.
  737  *
  738  * XXX: Broken at the moment.  Need some UMA magic to make it work again.
  739  */
  740 #define M_ASSERTVALID(m)                                                \
  741         KASSERT((((struct mbuf *)m)->m_flags & 0) == 0,                 \
  742             ("%s: attempted use of a free mbuf!", __func__))
  743 
  744 /*
  745  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an
  746  * object of the specified size at the end of the mbuf, longword aligned.
  747  */
  748 #define M_ALIGN(m, len) do {                                            \
  749         KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)),                     \
  750                 ("%s: M_ALIGN not normal mbuf", __func__));             \
  751         KASSERT((m)->m_data == (m)->m_dat,                              \
  752                 ("%s: M_ALIGN not a virgin mbuf", __func__));           \
  753         (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);            \
  754 } while (0)
  755 
  756 /*
  757  * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by
  758  * M_DUP/MOVE_PKTHDR.
  759  */
  760 #define MH_ALIGN(m, len) do {                                           \
  761         KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT),     \
  762                 ("%s: MH_ALIGN not PKTHDR mbuf", __func__));            \
  763         KASSERT((m)->m_data == (m)->m_pktdat,                           \
  764                 ("%s: MH_ALIGN not a virgin mbuf", __func__));          \
  765         (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);           \
  766 } while (0)
  767 
  768 /*
  769  * Compute the amount of space available before the current start of data in
  770  * an mbuf.
  771  *
  772  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
  773  * of checking writability of the mbuf data area rests solely with the caller.
  774  */
  775 #define M_LEADINGSPACE(m)                                               \
  776         ((m)->m_flags & M_EXT ?                                         \
  777             (M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):     \
  778             (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :     \
  779             (m)->m_data - (m)->m_dat)
  780 
  781 /*
  782  * Compute the amount of space available after the end of data in an mbuf.
  783  *
  784  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
  785  * of checking writability of the mbuf data area rests solely with the caller.
  786  */
  787 #define M_TRAILINGSPACE(m)                                              \
  788         ((m)->m_flags & M_EXT ?                                         \
  789             (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size   \
  790                 - ((m)->m_data + (m)->m_len) : 0) :                     \
  791             &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
  792 
  793 /*
  794  * Arrange to prepend space of size plen to mbuf m.  If a new mbuf must be
  795  * allocated, how specifies whether to wait.  If the allocation fails, the
  796  * original mbuf chain is freed and m is set to NULL.
  797  */
  798 #define M_PREPEND(m, plen, how) do {                                    \
  799         struct mbuf **_mmp = &(m);                                      \
  800         struct mbuf *_mm = *_mmp;                                       \
  801         int _mplen = (plen);                                            \
  802         int __mhow = (how);                                             \
  803                                                                         \
  804         MBUF_CHECKSLEEP(how);                                           \
  805         if (M_LEADINGSPACE(_mm) >= _mplen) {                            \
  806                 _mm->m_data -= _mplen;                                  \
  807                 _mm->m_len += _mplen;                                   \
  808         } else                                                          \
  809                 _mm = m_prepend(_mm, _mplen, __mhow);                   \
  810         if (_mm != NULL && _mm->m_flags & M_PKTHDR)                     \
  811                 _mm->m_pkthdr.len += _mplen;                            \
  812         *_mmp = _mm;                                                    \
  813 } while (0)
  814 
  815 /*
  816  * Change mbuf to new type.  This is a relatively expensive operation and
  817  * should be avoided.
  818  */
  819 #define MCHTYPE(m, t)   m_chtype((m), (t))
  820 
  821 /* Length to m_copy to copy all. */
  822 #define M_COPYALL       1000000000
  823 
  824 /* Compatibility with 4.3. */
  825 #define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT)
  826 
  827 extern int              max_datalen;    /* MHLEN - max_hdr */
  828 extern int              max_hdr;        /* Largest link + protocol header */
  829 extern int              max_linkhdr;    /* Largest link-level header */
  830 extern int              max_protohdr;   /* Largest protocol header */
  831 extern struct mbstat    mbstat;         /* General mbuf stats/infos */
  832 extern int              nmbclusters;    /* Maximum number of clusters */
  833 
  834 struct uio;
  835 
  836 void             m_adj(struct mbuf *, int);
  837 void             m_align(struct mbuf *, int);
  838 int              m_apply(struct mbuf *, int, int,
  839                     int (*)(void *, void *, u_int), void *);
  840 int              m_append(struct mbuf *, int, c_caddr_t);
  841 void             m_cat(struct mbuf *, struct mbuf *);
  842 void             m_extadd(struct mbuf *, caddr_t, u_int,
  843                     void (*)(void *, void *), void *, void *, int, int);
  844 struct mbuf     *m_collapse(struct mbuf *, int, int);
  845 void             m_copyback(struct mbuf *, int, int, c_caddr_t);
  846 void             m_copydata(const struct mbuf *, int, int, caddr_t);
  847 struct mbuf     *m_copym(struct mbuf *, int, int, int);
  848 struct mbuf     *m_copymdata(struct mbuf *, struct mbuf *,
  849                     int, int, int, int);
  850 struct mbuf     *m_copypacket(struct mbuf *, int);
  851 void             m_copy_pkthdr(struct mbuf *, struct mbuf *);
  852 struct mbuf     *m_copyup(struct mbuf *n, int len, int dstoff);
  853 struct mbuf     *m_defrag(struct mbuf *, int);
  854 void             m_demote(struct mbuf *, int);
  855 struct mbuf     *m_devget(char *, int, int, struct ifnet *,
  856                     void (*)(char *, caddr_t, u_int));
  857 struct mbuf     *m_dup(struct mbuf *, int);
  858 int              m_dup_pkthdr(struct mbuf *, struct mbuf *, int);
  859 u_int            m_fixhdr(struct mbuf *);
  860 struct mbuf     *m_fragment(struct mbuf *, int, int);
  861 void             m_freem(struct mbuf *);
  862 struct mbuf     *m_getm2(struct mbuf *, int, int, short, int);
  863 struct mbuf     *m_getptr(struct mbuf *, int, int *);
  864 u_int            m_length(struct mbuf *, struct mbuf **);
  865 int              m_mbuftouio(struct uio *, struct mbuf *, int);
  866 void             m_move_pkthdr(struct mbuf *, struct mbuf *);
  867 struct mbuf     *m_prepend(struct mbuf *, int, int);
  868 void             m_print(const struct mbuf *, int);
  869 struct mbuf     *m_pulldown(struct mbuf *, int, int, int *);
  870 struct mbuf     *m_pullup(struct mbuf *, int);
  871 int             m_sanity(struct mbuf *, int);
  872 struct mbuf     *m_split(struct mbuf *, int, int);
  873 struct mbuf     *m_uiotombuf(struct uio *, int, int, int, int);
  874 struct mbuf     *m_unshare(struct mbuf *, int how);
  875 
  876 /*-
  877  * Network packets may have annotations attached by affixing a list of
  878  * "packet tags" to the pkthdr structure.  Packet tags are dynamically
  879  * allocated semi-opaque data structures that have a fixed header
  880  * (struct m_tag) that specifies the size of the memory block and a
  881  * <cookie,type> pair that identifies it.  The cookie is a 32-bit unique
  882  * unsigned value used to identify a module or ABI.  By convention this value
  883  * is chosen as the date+time that the module is created, expressed as the
  884  * number of seconds since the epoch (e.g., using date -u +'%s').  The type
  885  * value is an ABI/module-specific value that identifies a particular
  886  * annotation and is private to the module.  For compatibility with systems
  887  * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
  888  * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
  889  * compatibility shim functions and several tag types are defined below.
  890  * Users that do not require compatibility should use a private cookie value
  891  * so that packet tag-related definitions can be maintained privately.
  892  *
  893  * Note that the packet tag returned by m_tag_alloc has the default memory
  894  * alignment implemented by malloc.  To reference private data one can use a
  895  * construct like:
  896  *
  897  *      struct m_tag *mtag = m_tag_alloc(...);
  898  *      struct foo *p = (struct foo *)(mtag+1);
  899  *
  900  * if the alignment of struct m_tag is sufficient for referencing members of
  901  * struct foo.  Otherwise it is necessary to embed struct m_tag within the
  902  * private data structure to insure proper alignment; e.g.,
  903  *
  904  *      struct foo {
  905  *              struct m_tag    tag;
  906  *              ...
  907  *      };
  908  *      struct foo *p = (struct foo *) m_tag_alloc(...);
  909  *      struct m_tag *mtag = &p->tag;
  910  */
  911 
  912 /*
  913  * Persistent tags stay with an mbuf until the mbuf is reclaimed.  Otherwise
  914  * tags are expected to ``vanish'' when they pass through a network
  915  * interface.  For most interfaces this happens normally as the tags are
  916  * reclaimed when the mbuf is free'd.  However in some special cases
  917  * reclaiming must be done manually.  An example is packets that pass through
  918  * the loopback interface.  Also, one must be careful to do this when
  919  * ``turning around'' packets (e.g., icmp_reflect).
  920  *
  921  * To mark a tag persistent bit-or this flag in when defining the tag id.
  922  * The tag will then be treated as described above.
  923  */
  924 #define MTAG_PERSISTENT                         0x800
  925 
  926 #define PACKET_TAG_NONE                         0  /* Nadda */
  927 
  928 /* Packet tags for use with PACKET_ABI_COMPAT. */
  929 #define PACKET_TAG_IPSEC_IN_DONE                1  /* IPsec applied, in */
  930 #define PACKET_TAG_IPSEC_OUT_DONE               2  /* IPsec applied, out */
  931 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE         3  /* NIC IPsec crypto done */
  932 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED      4  /* NIC IPsec crypto req'ed */
  933 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO     5  /* NIC notifies IPsec */
  934 #define PACKET_TAG_IPSEC_PENDING_TDB            6  /* Reminder to do IPsec */
  935 #define PACKET_TAG_BRIDGE                       7  /* Bridge processing done */
  936 #define PACKET_TAG_GIF                          8  /* GIF processing done */
  937 #define PACKET_TAG_GRE                          9  /* GRE processing done */
  938 #define PACKET_TAG_IN_PACKET_CHECKSUM           10 /* NIC checksumming done */
  939 #define PACKET_TAG_ENCAP                        11 /* Encap.  processing */
  940 #define PACKET_TAG_IPSEC_SOCKET                 12 /* IPSEC socket ref */
  941 #define PACKET_TAG_IPSEC_HISTORY                13 /* IPSEC history */
  942 #define PACKET_TAG_IPV6_INPUT                   14 /* IPV6 input processing */
  943 #define PACKET_TAG_DUMMYNET                     15 /* dummynet info */
  944 #define PACKET_TAG_DIVERT                       17 /* divert info */
  945 #define PACKET_TAG_IPFORWARD                    18 /* ipforward info */
  946 #define PACKET_TAG_MACLABEL     (19 | MTAG_PERSISTENT) /* MAC label */
  947 #define PACKET_TAG_PF                           21 /* PF + ALTQ information */
  948 #define PACKET_TAG_RTSOCKFAM                    25 /* rtsock sa family */
  949 #define PACKET_TAG_IPOPTIONS                    27 /* Saved IP options */
  950 #define PACKET_TAG_CARP                         28 /* CARP info */
  951 #define PACKET_TAG_IPSEC_NAT_T_PORTS            29 /* two uint16_t */
  952 #define PACKET_TAG_ND_OUTGOING                  30 /* ND outgoing */
  953 
  954 /* Specific cookies and tags. */
  955 
  956 /* Packet tag routines. */
  957 struct m_tag    *m_tag_alloc(u_int32_t, int, int, int);
  958 void             m_tag_delete(struct mbuf *, struct m_tag *);
  959 void             m_tag_delete_chain(struct mbuf *, struct m_tag *);
  960 void             m_tag_free_default(struct m_tag *);
  961 struct m_tag    *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
  962 struct m_tag    *m_tag_copy(struct m_tag *, int);
  963 int              m_tag_copy_chain(struct mbuf *, struct mbuf *, int);
  964 void             m_tag_delete_nonpersistent(struct mbuf *);
  965 
  966 /*
  967  * Initialize the list of tags associated with an mbuf.
  968  */
  969 static __inline void
  970 m_tag_init(struct mbuf *m)
  971 {
  972 
  973         SLIST_INIT(&m->m_pkthdr.tags);
  974 }
  975 
  976 /*
  977  * Set up the contents of a tag.  Note that this does not fill in the free
  978  * method; the caller is expected to do that.
  979  *
  980  * XXX probably should be called m_tag_init, but that was already taken.
  981  */
  982 static __inline void
  983 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
  984 {
  985 
  986         t->m_tag_id = type;
  987         t->m_tag_len = len;
  988         t->m_tag_cookie = cookie;
  989 }
  990 
  991 /*
  992  * Reclaim resources associated with a tag.
  993  */
  994 static __inline void
  995 m_tag_free(struct m_tag *t)
  996 {
  997 
  998         (*t->m_tag_free)(t);
  999 }
 1000 
 1001 /*
 1002  * Return the first tag associated with an mbuf.
 1003  */
 1004 static __inline struct m_tag *
 1005 m_tag_first(struct mbuf *m)
 1006 {
 1007 
 1008         return (SLIST_FIRST(&m->m_pkthdr.tags));
 1009 }
 1010 
 1011 /*
 1012  * Return the next tag in the list of tags associated with an mbuf.
 1013  */
 1014 static __inline struct m_tag *
 1015 m_tag_next(struct mbuf *m, struct m_tag *t)
 1016 {
 1017 
 1018         return (SLIST_NEXT(t, m_tag_link));
 1019 }
 1020 
 1021 /*
 1022  * Prepend a tag to the list of tags associated with an mbuf.
 1023  */
 1024 static __inline void
 1025 m_tag_prepend(struct mbuf *m, struct m_tag *t)
 1026 {
 1027 
 1028         SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
 1029 }
 1030 
 1031 /*
 1032  * Unlink a tag from the list of tags associated with an mbuf.
 1033  */
 1034 static __inline void
 1035 m_tag_unlink(struct mbuf *m, struct m_tag *t)
 1036 {
 1037 
 1038         SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
 1039 }
 1040 
 1041 /* These are for OpenBSD compatibility. */
 1042 #define MTAG_ABI_COMPAT         0               /* compatibility ABI */
 1043 
 1044 static __inline struct m_tag *
 1045 m_tag_get(int type, int length, int wait)
 1046 {
 1047         return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
 1048 }
 1049 
 1050 static __inline struct m_tag *
 1051 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
 1052 {
 1053         return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
 1054             m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
 1055 }
 1056 
 1057 /* XXX temporary FIB methods probably eventually use tags.*/
 1058 #define M_FIBSHIFT    28
 1059 #define M_FIBMASK       0x0F
 1060 
 1061 /* get the fib from an mbuf and if it is not set, return the default */
 1062 #define M_GETFIB(_m) \
 1063     ((((_m)->m_flags & M_FIB) >> M_FIBSHIFT) & M_FIBMASK)
 1064 
 1065 #define M_SETFIB(_m, _fib) do {                                         \
 1066         _m->m_flags &= ~M_FIB;                                          \
 1067         _m->m_flags |= (((_fib) << M_FIBSHIFT) & M_FIB);  \
 1068 } while (0) 
 1069 
 1070 #endif /* _KERNEL */
 1071 
 1072 #ifdef MBUF_PROFILING
 1073  void m_profile(struct mbuf *m);
 1074  #define M_PROFILE(m) m_profile(m)
 1075 #else
 1076  #define M_PROFILE(m)
 1077 #endif
 1078 
 1079 
 1080 #endif /* !_SYS_MBUF_H_ */

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