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/9.1/sys/sys/mbuf.h 238250 2012-07-08 16:00:45Z tuexen $
   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 #define CSUM_SCTP_IPV6          0x0080          /* will csum IPv6/SCTP */
  287 
  288 #define CSUM_IP_CHECKED         0x0100          /* did csum IP */
  289 #define CSUM_IP_VALID           0x0200          /*   ... the csum is valid */
  290 #define CSUM_DATA_VALID         0x0400          /* csum_data field is valid */
  291 #define CSUM_PSEUDO_HDR         0x0800          /* csum_data has pseudo hdr */
  292 #define CSUM_SCTP_VALID         0x1000          /* SCTP checksum is valid */
  293 #define CSUM_UDP_IPV6           0x2000          /* will csum IPv6/UDP */
  294 #define CSUM_TCP_IPV6           0x4000          /* will csum IPv6/TCP */
  295 /*      CSUM_TSO_IPV6           0x8000          will do IPv6/TSO */
  296 
  297 /*      CSUM_FRAGMENT_IPV6      0x10000         will do IPv6 fragementation */
  298 
  299 #define CSUM_DELAY_DATA_IPV6    (CSUM_TCP_IPV6 | CSUM_UDP_IPV6)
  300 #define CSUM_DATA_VALID_IPV6    CSUM_DATA_VALID
  301 
  302 #define CSUM_DELAY_DATA         (CSUM_TCP | CSUM_UDP)
  303 #define CSUM_DELAY_IP           (CSUM_IP)       /* Only v4, no v6 IP hdr csum */
  304 
  305 /*
  306  * mbuf types.
  307  */
  308 #define MT_NOTMBUF      0       /* USED INTERNALLY ONLY! Object is not mbuf */
  309 #define MT_DATA         1       /* dynamic (data) allocation */
  310 #define MT_HEADER       MT_DATA /* packet header, use M_PKTHDR instead */
  311 #define MT_SONAME       8       /* socket name */
  312 #define MT_CONTROL      14      /* extra-data protocol message */
  313 #define MT_OOBDATA      15      /* expedited data  */
  314 #define MT_NTYPES       16      /* number of mbuf types for mbtypes[] */
  315 
  316 #define MT_NOINIT       255     /* Not a type but a flag to allocate
  317                                    a non-initialized mbuf */
  318 
  319 #define MB_NOTAGS       0x1UL   /* no tags attached to mbuf */
  320 
  321 /*
  322  * General mbuf allocator statistics structure.
  323  *
  324  * Many of these statistics are no longer used; we instead track many
  325  * allocator statistics through UMA's built in statistics mechanism.
  326  */
  327 struct mbstat {
  328         u_long  m_mbufs;        /* XXX */
  329         u_long  m_mclusts;      /* XXX */
  330 
  331         u_long  m_drain;        /* times drained protocols for space */
  332         u_long  m_mcfail;       /* XXX: times m_copym failed */
  333         u_long  m_mpfail;       /* XXX: times m_pullup failed */
  334         u_long  m_msize;        /* length of an mbuf */
  335         u_long  m_mclbytes;     /* length of an mbuf cluster */
  336         u_long  m_minclsize;    /* min length of data to allocate a cluster */
  337         u_long  m_mlen;         /* length of data in an mbuf */
  338         u_long  m_mhlen;        /* length of data in a header mbuf */
  339 
  340         /* Number of mbtypes (gives # elems in mbtypes[] array) */
  341         short   m_numtypes;
  342 
  343         /* XXX: Sendfile stats should eventually move to their own struct */
  344         u_long  sf_iocnt;       /* times sendfile had to do disk I/O */
  345         u_long  sf_allocfail;   /* times sfbuf allocation failed */
  346         u_long  sf_allocwait;   /* times sfbuf allocation had to wait */
  347 };
  348 
  349 /*
  350  * Flags specifying how an allocation should be made.
  351  *
  352  * The flag to use is as follows:
  353  * - M_DONTWAIT or M_NOWAIT from an interrupt handler to not block allocation.
  354  * - M_WAIT or M_WAITOK from wherever it is safe to block.
  355  *
  356  * M_DONTWAIT/M_NOWAIT means that we will not block the thread explicitly and
  357  * if we cannot allocate immediately we may return NULL, whereas
  358  * M_WAIT/M_WAITOK means that if we cannot allocate resources we
  359  * will block until they are available, and thus never return NULL.
  360  *
  361  * XXX Eventually just phase this out to use M_WAITOK/M_NOWAIT.
  362  */
  363 #define MBTOM(how)      (how)
  364 #define M_DONTWAIT      M_NOWAIT
  365 #define M_TRYWAIT       M_WAITOK
  366 #define M_WAIT          M_WAITOK
  367 
  368 /*
  369  * String names of mbuf-related UMA(9) and malloc(9) types.  Exposed to
  370  * !_KERNEL so that monitoring tools can look up the zones with
  371  * libmemstat(3).
  372  */
  373 #define MBUF_MEM_NAME           "mbuf"
  374 #define MBUF_CLUSTER_MEM_NAME   "mbuf_cluster"
  375 #define MBUF_PACKET_MEM_NAME    "mbuf_packet"
  376 #define MBUF_JUMBOP_MEM_NAME    "mbuf_jumbo_page"
  377 #define MBUF_JUMBO9_MEM_NAME    "mbuf_jumbo_9k"
  378 #define MBUF_JUMBO16_MEM_NAME   "mbuf_jumbo_16k"
  379 #define MBUF_TAG_MEM_NAME       "mbuf_tag"
  380 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
  381 
  382 #ifdef _KERNEL
  383 
  384 #ifdef WITNESS
  385 #define MBUF_CHECKSLEEP(how) do {                                       \
  386         if (how == M_WAITOK)                                            \
  387                 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,         \
  388                     "Sleeping in \"%s\"", __func__);                    \
  389 } while (0)
  390 #else
  391 #define MBUF_CHECKSLEEP(how)
  392 #endif
  393 
  394 /*
  395  * Network buffer allocation API
  396  *
  397  * The rest of it is defined in kern/kern_mbuf.c
  398  */
  399 
  400 extern uma_zone_t       zone_mbuf;
  401 extern uma_zone_t       zone_clust;
  402 extern uma_zone_t       zone_pack;
  403 extern uma_zone_t       zone_jumbop;
  404 extern uma_zone_t       zone_jumbo9;
  405 extern uma_zone_t       zone_jumbo16;
  406 extern uma_zone_t       zone_ext_refcnt;
  407 
  408 static __inline struct mbuf     *m_getcl(int how, short type, int flags);
  409 static __inline struct mbuf     *m_get(int how, short type);
  410 static __inline struct mbuf     *m_gethdr(int how, short type);
  411 static __inline struct mbuf     *m_getjcl(int how, short type, int flags,
  412                                     int size);
  413 static __inline struct mbuf     *m_getclr(int how, short type); /* XXX */
  414 static __inline int              m_init(struct mbuf *m, uma_zone_t zone,
  415                                     int size, int how, short type, int flags);
  416 static __inline struct mbuf     *m_free(struct mbuf *m);
  417 static __inline void             m_clget(struct mbuf *m, int how);
  418 static __inline void            *m_cljget(struct mbuf *m, int how, int size);
  419 static __inline void             m_chtype(struct mbuf *m, short new_type);
  420 void                             mb_free_ext(struct mbuf *);
  421 static __inline struct mbuf     *m_last(struct mbuf *m);
  422 int                              m_pkthdr_init(struct mbuf *m, int how);
  423 
  424 static __inline int
  425 m_gettype(int size)
  426 {
  427         int type;
  428 
  429         switch (size) {
  430         case MSIZE:
  431                 type = EXT_MBUF;
  432                 break;
  433         case MCLBYTES:
  434                 type = EXT_CLUSTER;
  435                 break;
  436 #if MJUMPAGESIZE != MCLBYTES
  437         case MJUMPAGESIZE:
  438                 type = EXT_JUMBOP;
  439                 break;
  440 #endif
  441         case MJUM9BYTES:
  442                 type = EXT_JUMBO9;
  443                 break;
  444         case MJUM16BYTES:
  445                 type = EXT_JUMBO16;
  446                 break;
  447         default:
  448                 panic("%s: m_getjcl: invalid cluster size", __func__);
  449         }
  450 
  451         return (type);
  452 }
  453 
  454 static __inline uma_zone_t
  455 m_getzone(int size)
  456 {
  457         uma_zone_t zone;
  458 
  459         switch (size) {
  460         case MSIZE:
  461                 zone = zone_mbuf;
  462                 break;
  463         case MCLBYTES:
  464                 zone = zone_clust;
  465                 break;
  466 #if MJUMPAGESIZE != MCLBYTES
  467         case MJUMPAGESIZE:
  468                 zone = zone_jumbop;
  469                 break;
  470 #endif
  471         case MJUM9BYTES:
  472                 zone = zone_jumbo9;
  473                 break;
  474         case MJUM16BYTES:
  475                 zone = zone_jumbo16;
  476                 break;
  477         default:
  478                 panic("%s: m_getjcl: invalid cluster type", __func__);
  479         }
  480 
  481         return (zone);
  482 }
  483 
  484 /*
  485  * Initialize an mbuf with linear storage.
  486  *
  487  * Inline because the consumer text overhead will be roughly the same to
  488  * initialize or call a function with this many parameters and M_PKTHDR
  489  * should go away with constant propagation for !MGETHDR.
  490  */
  491 static __inline int
  492 m_init(struct mbuf *m, uma_zone_t zone, int size, int how, short type,
  493     int flags)
  494 {
  495         int error;
  496 
  497         m->m_next = NULL;
  498         m->m_nextpkt = NULL;
  499         m->m_data = m->m_dat;
  500         m->m_len = 0;
  501         m->m_flags = flags;
  502         m->m_type = type;
  503         if (flags & M_PKTHDR) {
  504                 if ((error = m_pkthdr_init(m, how)) != 0)
  505                         return (error);
  506         }
  507 
  508         return (0);
  509 }
  510 
  511 static __inline struct mbuf *
  512 m_get(int how, short type)
  513 {
  514         struct mb_args args;
  515 
  516         args.flags = 0;
  517         args.type = type;
  518         return ((struct mbuf *)(uma_zalloc_arg(zone_mbuf, &args, how)));
  519 }
  520 
  521 /*
  522  * XXX This should be deprecated, very little use.
  523  */
  524 static __inline struct mbuf *
  525 m_getclr(int how, short type)
  526 {
  527         struct mbuf *m;
  528         struct mb_args args;
  529 
  530         args.flags = 0;
  531         args.type = type;
  532         m = uma_zalloc_arg(zone_mbuf, &args, how);
  533         if (m != NULL)
  534                 bzero(m->m_data, MLEN);
  535         return (m);
  536 }
  537 
  538 static __inline struct mbuf *
  539 m_gethdr(int how, short type)
  540 {
  541         struct mb_args args;
  542 
  543         args.flags = M_PKTHDR;
  544         args.type = type;
  545         return ((struct mbuf *)(uma_zalloc_arg(zone_mbuf, &args, how)));
  546 }
  547 
  548 static __inline struct mbuf *
  549 m_getcl(int how, short type, int flags)
  550 {
  551         struct mb_args args;
  552 
  553         args.flags = flags;
  554         args.type = type;
  555         return ((struct mbuf *)(uma_zalloc_arg(zone_pack, &args, how)));
  556 }
  557 
  558 /*
  559  * m_getjcl() returns an mbuf with a cluster of the specified size attached.
  560  * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
  561  *
  562  * XXX: This is rather large, should be real function maybe.
  563  */
  564 static __inline struct mbuf *
  565 m_getjcl(int how, short type, int flags, int size)
  566 {
  567         struct mb_args args;
  568         struct mbuf *m, *n;
  569         uma_zone_t zone;
  570 
  571         if (size == MCLBYTES)
  572                 return m_getcl(how, type, flags);
  573 
  574         args.flags = flags;
  575         args.type = type;
  576 
  577         m = uma_zalloc_arg(zone_mbuf, &args, how);
  578         if (m == NULL)
  579                 return (NULL);
  580 
  581         zone = m_getzone(size);
  582         n = uma_zalloc_arg(zone, m, how);
  583         if (n == NULL) {
  584                 uma_zfree(zone_mbuf, m);
  585                 return (NULL);
  586         }
  587         return (m);
  588 }
  589 
  590 static __inline void
  591 m_free_fast(struct mbuf *m)
  592 {
  593 #ifdef INVARIANTS
  594         if (m->m_flags & M_PKTHDR)
  595                 KASSERT(SLIST_EMPTY(&m->m_pkthdr.tags), ("doing fast free of mbuf with tags"));
  596 #endif
  597 
  598         uma_zfree_arg(zone_mbuf, m, (void *)MB_NOTAGS);
  599 }
  600 
  601 static __inline struct mbuf *
  602 m_free(struct mbuf *m)
  603 {
  604         struct mbuf *n = m->m_next;
  605 
  606         if (m->m_flags & M_EXT)
  607                 mb_free_ext(m);
  608         else if ((m->m_flags & M_NOFREE) == 0)
  609                 uma_zfree(zone_mbuf, m);
  610         return (n);
  611 }
  612 
  613 static __inline void
  614 m_clget(struct mbuf *m, int how)
  615 {
  616 
  617         if (m->m_flags & M_EXT)
  618                 printf("%s: %p mbuf already has cluster\n", __func__, m);
  619         m->m_ext.ext_buf = (char *)NULL;
  620         uma_zalloc_arg(zone_clust, m, how);
  621         /*
  622          * On a cluster allocation failure, drain the packet zone and retry,
  623          * we might be able to loosen a few clusters up on the drain.
  624          */
  625         if ((how & M_NOWAIT) && (m->m_ext.ext_buf == NULL)) {
  626                 zone_drain(zone_pack);
  627                 uma_zalloc_arg(zone_clust, m, how);
  628         }
  629 }
  630 
  631 /*
  632  * m_cljget() is different from m_clget() as it can allocate clusters without
  633  * attaching them to an mbuf.  In that case the return value is the pointer
  634  * to the cluster of the requested size.  If an mbuf was specified, it gets
  635  * the cluster attached to it and the return value can be safely ignored.
  636  * For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
  637  */
  638 static __inline void *
  639 m_cljget(struct mbuf *m, int how, int size)
  640 {
  641         uma_zone_t zone;
  642 
  643         if (m && m->m_flags & M_EXT)
  644                 printf("%s: %p mbuf already has cluster\n", __func__, m);
  645         if (m != NULL)
  646                 m->m_ext.ext_buf = NULL;
  647 
  648         zone = m_getzone(size);
  649         return (uma_zalloc_arg(zone, m, how));
  650 }
  651 
  652 static __inline void
  653 m_cljset(struct mbuf *m, void *cl, int type)
  654 {
  655         uma_zone_t zone;
  656         int size;
  657 
  658         switch (type) {
  659         case EXT_CLUSTER:
  660                 size = MCLBYTES;
  661                 zone = zone_clust;
  662                 break;
  663 #if MJUMPAGESIZE != MCLBYTES
  664         case EXT_JUMBOP:
  665                 size = MJUMPAGESIZE;
  666                 zone = zone_jumbop;
  667                 break;
  668 #endif
  669         case EXT_JUMBO9:
  670                 size = MJUM9BYTES;
  671                 zone = zone_jumbo9;
  672                 break;
  673         case EXT_JUMBO16:
  674                 size = MJUM16BYTES;
  675                 zone = zone_jumbo16;
  676                 break;
  677         default:
  678                 panic("unknown cluster type");
  679                 break;
  680         }
  681 
  682         m->m_data = m->m_ext.ext_buf = cl;
  683         m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
  684         m->m_ext.ext_size = size;
  685         m->m_ext.ext_type = type;
  686         m->m_ext.ref_cnt = uma_find_refcnt(zone, cl);
  687         m->m_flags |= M_EXT;
  688 
  689 }
  690 
  691 static __inline void
  692 m_chtype(struct mbuf *m, short new_type)
  693 {
  694 
  695         m->m_type = new_type;
  696 }
  697 
  698 static __inline struct mbuf *
  699 m_last(struct mbuf *m)
  700 {
  701 
  702         while (m->m_next)
  703                 m = m->m_next;
  704         return (m);
  705 }
  706 
  707 extern void (*m_addr_chg_pf_p)(struct mbuf *m);
  708 
  709 static __inline void
  710 m_addr_changed(struct mbuf *m)
  711 {
  712 
  713         if (m_addr_chg_pf_p)
  714                 m_addr_chg_pf_p(m);
  715 }
  716 
  717 /*
  718  * mbuf, cluster, and external object allocation macros (for compatibility
  719  * purposes).
  720  */
  721 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
  722 #define MGET(m, how, type)      ((m) = m_get((how), (type)))
  723 #define MGETHDR(m, how, type)   ((m) = m_gethdr((how), (type)))
  724 #define MCLGET(m, how)          m_clget((m), (how))
  725 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type)            \
  726     m_extadd((m), (caddr_t)(buf), (size), (free),(arg1),(arg2),(flags), (type))
  727 #define m_getm(m, len, how, type)                                       \
  728     m_getm2((m), (len), (how), (type), M_PKTHDR)
  729 
  730 /*
  731  * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
  732  * be both the local data payload, or an external buffer area, depending on
  733  * whether M_EXT is set).
  734  */
  735 #define M_WRITABLE(m)   (!((m)->m_flags & M_RDONLY) &&                  \
  736                          (!(((m)->m_flags & M_EXT)) ||                  \
  737                          (*((m)->m_ext.ref_cnt) == 1)) )                \
  738 
  739 /* Check if the supplied mbuf has a packet header, or else panic. */
  740 #define M_ASSERTPKTHDR(m)                                               \
  741         KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR,                 \
  742             ("%s: no mbuf packet header!", __func__))
  743 
  744 /*
  745  * Ensure that the supplied mbuf is a valid, non-free mbuf.
  746  *
  747  * XXX: Broken at the moment.  Need some UMA magic to make it work again.
  748  */
  749 #define M_ASSERTVALID(m)                                                \
  750         KASSERT((((struct mbuf *)m)->m_flags & 0) == 0,                 \
  751             ("%s: attempted use of a free mbuf!", __func__))
  752 
  753 /*
  754  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an
  755  * object of the specified size at the end of the mbuf, longword aligned.
  756  */
  757 #define M_ALIGN(m, len) do {                                            \
  758         KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)),                     \
  759                 ("%s: M_ALIGN not normal mbuf", __func__));             \
  760         KASSERT((m)->m_data == (m)->m_dat,                              \
  761                 ("%s: M_ALIGN not a virgin mbuf", __func__));           \
  762         (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);            \
  763 } while (0)
  764 
  765 /*
  766  * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by
  767  * M_DUP/MOVE_PKTHDR.
  768  */
  769 #define MH_ALIGN(m, len) do {                                           \
  770         KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT),     \
  771                 ("%s: MH_ALIGN not PKTHDR mbuf", __func__));            \
  772         KASSERT((m)->m_data == (m)->m_pktdat,                           \
  773                 ("%s: MH_ALIGN not a virgin mbuf", __func__));          \
  774         (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);           \
  775 } while (0)
  776 
  777 /*
  778  * Compute the amount of space available before the current start of data in
  779  * an mbuf.
  780  *
  781  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
  782  * of checking writability of the mbuf data area rests solely with the caller.
  783  */
  784 #define M_LEADINGSPACE(m)                                               \
  785         ((m)->m_flags & M_EXT ?                                         \
  786             (M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):     \
  787             (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :     \
  788             (m)->m_data - (m)->m_dat)
  789 
  790 /*
  791  * Compute the amount of space available after the end of data in an mbuf.
  792  *
  793  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
  794  * of checking writability of the mbuf data area rests solely with the caller.
  795  */
  796 #define M_TRAILINGSPACE(m)                                              \
  797         ((m)->m_flags & M_EXT ?                                         \
  798             (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size   \
  799                 - ((m)->m_data + (m)->m_len) : 0) :                     \
  800             &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
  801 
  802 /*
  803  * Arrange to prepend space of size plen to mbuf m.  If a new mbuf must be
  804  * allocated, how specifies whether to wait.  If the allocation fails, the
  805  * original mbuf chain is freed and m is set to NULL.
  806  */
  807 #define M_PREPEND(m, plen, how) do {                                    \
  808         struct mbuf **_mmp = &(m);                                      \
  809         struct mbuf *_mm = *_mmp;                                       \
  810         int _mplen = (plen);                                            \
  811         int __mhow = (how);                                             \
  812                                                                         \
  813         MBUF_CHECKSLEEP(how);                                           \
  814         if (M_LEADINGSPACE(_mm) >= _mplen) {                            \
  815                 _mm->m_data -= _mplen;                                  \
  816                 _mm->m_len += _mplen;                                   \
  817         } else                                                          \
  818                 _mm = m_prepend(_mm, _mplen, __mhow);                   \
  819         if (_mm != NULL && _mm->m_flags & M_PKTHDR)                     \
  820                 _mm->m_pkthdr.len += _mplen;                            \
  821         *_mmp = _mm;                                                    \
  822 } while (0)
  823 
  824 /*
  825  * Change mbuf to new type.  This is a relatively expensive operation and
  826  * should be avoided.
  827  */
  828 #define MCHTYPE(m, t)   m_chtype((m), (t))
  829 
  830 /* Length to m_copy to copy all. */
  831 #define M_COPYALL       1000000000
  832 
  833 /* Compatibility with 4.3. */
  834 #define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT)
  835 
  836 extern int              max_datalen;    /* MHLEN - max_hdr */
  837 extern int              max_hdr;        /* Largest link + protocol header */
  838 extern int              max_linkhdr;    /* Largest link-level header */
  839 extern int              max_protohdr;   /* Largest protocol header */
  840 extern struct mbstat    mbstat;         /* General mbuf stats/infos */
  841 extern int              nmbclusters;    /* Maximum number of clusters */
  842 
  843 struct uio;
  844 
  845 void             m_adj(struct mbuf *, int);
  846 void             m_align(struct mbuf *, int);
  847 int              m_apply(struct mbuf *, int, int,
  848                     int (*)(void *, void *, u_int), void *);
  849 int              m_append(struct mbuf *, int, c_caddr_t);
  850 void             m_cat(struct mbuf *, struct mbuf *);
  851 void             m_extadd(struct mbuf *, caddr_t, u_int,
  852                     void (*)(void *, void *), void *, void *, int, int);
  853 struct mbuf     *m_collapse(struct mbuf *, int, int);
  854 void             m_copyback(struct mbuf *, int, int, c_caddr_t);
  855 void             m_copydata(const struct mbuf *, int, int, caddr_t);
  856 struct mbuf     *m_copym(struct mbuf *, int, int, int);
  857 struct mbuf     *m_copymdata(struct mbuf *, struct mbuf *,
  858                     int, int, int, int);
  859 struct mbuf     *m_copypacket(struct mbuf *, int);
  860 void             m_copy_pkthdr(struct mbuf *, struct mbuf *);
  861 struct mbuf     *m_copyup(struct mbuf *n, int len, int dstoff);
  862 struct mbuf     *m_defrag(struct mbuf *, int);
  863 void             m_demote(struct mbuf *, int);
  864 struct mbuf     *m_devget(char *, int, int, struct ifnet *,
  865                     void (*)(char *, caddr_t, u_int));
  866 struct mbuf     *m_dup(struct mbuf *, int);
  867 int              m_dup_pkthdr(struct mbuf *, struct mbuf *, int);
  868 u_int            m_fixhdr(struct mbuf *);
  869 struct mbuf     *m_fragment(struct mbuf *, int, int);
  870 void             m_freem(struct mbuf *);
  871 struct mbuf     *m_getm2(struct mbuf *, int, int, short, int);
  872 struct mbuf     *m_getptr(struct mbuf *, int, int *);
  873 u_int            m_length(struct mbuf *, struct mbuf **);
  874 int              m_mbuftouio(struct uio *, struct mbuf *, int);
  875 void             m_move_pkthdr(struct mbuf *, struct mbuf *);
  876 struct mbuf     *m_prepend(struct mbuf *, int, int);
  877 void             m_print(const struct mbuf *, int);
  878 struct mbuf     *m_pulldown(struct mbuf *, int, int, int *);
  879 struct mbuf     *m_pullup(struct mbuf *, int);
  880 int             m_sanity(struct mbuf *, int);
  881 struct mbuf     *m_split(struct mbuf *, int, int);
  882 struct mbuf     *m_uiotombuf(struct uio *, int, int, int, int);
  883 struct mbuf     *m_unshare(struct mbuf *, int how);
  884 
  885 /*-
  886  * Network packets may have annotations attached by affixing a list of
  887  * "packet tags" to the pkthdr structure.  Packet tags are dynamically
  888  * allocated semi-opaque data structures that have a fixed header
  889  * (struct m_tag) that specifies the size of the memory block and a
  890  * <cookie,type> pair that identifies it.  The cookie is a 32-bit unique
  891  * unsigned value used to identify a module or ABI.  By convention this value
  892  * is chosen as the date+time that the module is created, expressed as the
  893  * number of seconds since the epoch (e.g., using date -u +'%s').  The type
  894  * value is an ABI/module-specific value that identifies a particular
  895  * annotation and is private to the module.  For compatibility with systems
  896  * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
  897  * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
  898  * compatibility shim functions and several tag types are defined below.
  899  * Users that do not require compatibility should use a private cookie value
  900  * so that packet tag-related definitions can be maintained privately.
  901  *
  902  * Note that the packet tag returned by m_tag_alloc has the default memory
  903  * alignment implemented by malloc.  To reference private data one can use a
  904  * construct like:
  905  *
  906  *      struct m_tag *mtag = m_tag_alloc(...);
  907  *      struct foo *p = (struct foo *)(mtag+1);
  908  *
  909  * if the alignment of struct m_tag is sufficient for referencing members of
  910  * struct foo.  Otherwise it is necessary to embed struct m_tag within the
  911  * private data structure to insure proper alignment; e.g.,
  912  *
  913  *      struct foo {
  914  *              struct m_tag    tag;
  915  *              ...
  916  *      };
  917  *      struct foo *p = (struct foo *) m_tag_alloc(...);
  918  *      struct m_tag *mtag = &p->tag;
  919  */
  920 
  921 /*
  922  * Persistent tags stay with an mbuf until the mbuf is reclaimed.  Otherwise
  923  * tags are expected to ``vanish'' when they pass through a network
  924  * interface.  For most interfaces this happens normally as the tags are
  925  * reclaimed when the mbuf is free'd.  However in some special cases
  926  * reclaiming must be done manually.  An example is packets that pass through
  927  * the loopback interface.  Also, one must be careful to do this when
  928  * ``turning around'' packets (e.g., icmp_reflect).
  929  *
  930  * To mark a tag persistent bit-or this flag in when defining the tag id.
  931  * The tag will then be treated as described above.
  932  */
  933 #define MTAG_PERSISTENT                         0x800
  934 
  935 #define PACKET_TAG_NONE                         0  /* Nadda */
  936 
  937 /* Packet tags for use with PACKET_ABI_COMPAT. */
  938 #define PACKET_TAG_IPSEC_IN_DONE                1  /* IPsec applied, in */
  939 #define PACKET_TAG_IPSEC_OUT_DONE               2  /* IPsec applied, out */
  940 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE         3  /* NIC IPsec crypto done */
  941 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED      4  /* NIC IPsec crypto req'ed */
  942 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO     5  /* NIC notifies IPsec */
  943 #define PACKET_TAG_IPSEC_PENDING_TDB            6  /* Reminder to do IPsec */
  944 #define PACKET_TAG_BRIDGE                       7  /* Bridge processing done */
  945 #define PACKET_TAG_GIF                          8  /* GIF processing done */
  946 #define PACKET_TAG_GRE                          9  /* GRE processing done */
  947 #define PACKET_TAG_IN_PACKET_CHECKSUM           10 /* NIC checksumming done */
  948 #define PACKET_TAG_ENCAP                        11 /* Encap.  processing */
  949 #define PACKET_TAG_IPSEC_SOCKET                 12 /* IPSEC socket ref */
  950 #define PACKET_TAG_IPSEC_HISTORY                13 /* IPSEC history */
  951 #define PACKET_TAG_IPV6_INPUT                   14 /* IPV6 input processing */
  952 #define PACKET_TAG_DUMMYNET                     15 /* dummynet info */
  953 #define PACKET_TAG_DIVERT                       17 /* divert info */
  954 #define PACKET_TAG_IPFORWARD                    18 /* ipforward info */
  955 #define PACKET_TAG_MACLABEL     (19 | MTAG_PERSISTENT) /* MAC label */
  956 #define PACKET_TAG_PF                           21 /* PF + ALTQ information */
  957 #define PACKET_TAG_RTSOCKFAM                    25 /* rtsock sa family */
  958 #define PACKET_TAG_IPOPTIONS                    27 /* Saved IP options */
  959 #define PACKET_TAG_CARP                         28 /* CARP info */
  960 #define PACKET_TAG_IPSEC_NAT_T_PORTS            29 /* two uint16_t */
  961 #define PACKET_TAG_ND_OUTGOING                  30 /* ND outgoing */
  962 
  963 /* Specific cookies and tags. */
  964 
  965 /* Packet tag routines. */
  966 struct m_tag    *m_tag_alloc(u_int32_t, int, int, int);
  967 void             m_tag_delete(struct mbuf *, struct m_tag *);
  968 void             m_tag_delete_chain(struct mbuf *, struct m_tag *);
  969 void             m_tag_free_default(struct m_tag *);
  970 struct m_tag    *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
  971 struct m_tag    *m_tag_copy(struct m_tag *, int);
  972 int              m_tag_copy_chain(struct mbuf *, struct mbuf *, int);
  973 void             m_tag_delete_nonpersistent(struct mbuf *);
  974 
  975 /*
  976  * Initialize the list of tags associated with an mbuf.
  977  */
  978 static __inline void
  979 m_tag_init(struct mbuf *m)
  980 {
  981 
  982         SLIST_INIT(&m->m_pkthdr.tags);
  983 }
  984 
  985 /*
  986  * Set up the contents of a tag.  Note that this does not fill in the free
  987  * method; the caller is expected to do that.
  988  *
  989  * XXX probably should be called m_tag_init, but that was already taken.
  990  */
  991 static __inline void
  992 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
  993 {
  994 
  995         t->m_tag_id = type;
  996         t->m_tag_len = len;
  997         t->m_tag_cookie = cookie;
  998 }
  999 
 1000 /*
 1001  * Reclaim resources associated with a tag.
 1002  */
 1003 static __inline void
 1004 m_tag_free(struct m_tag *t)
 1005 {
 1006 
 1007         (*t->m_tag_free)(t);
 1008 }
 1009 
 1010 /*
 1011  * Return the first tag associated with an mbuf.
 1012  */
 1013 static __inline struct m_tag *
 1014 m_tag_first(struct mbuf *m)
 1015 {
 1016 
 1017         return (SLIST_FIRST(&m->m_pkthdr.tags));
 1018 }
 1019 
 1020 /*
 1021  * Return the next tag in the list of tags associated with an mbuf.
 1022  */
 1023 static __inline struct m_tag *
 1024 m_tag_next(struct mbuf *m, struct m_tag *t)
 1025 {
 1026 
 1027         return (SLIST_NEXT(t, m_tag_link));
 1028 }
 1029 
 1030 /*
 1031  * Prepend a tag to the list of tags associated with an mbuf.
 1032  */
 1033 static __inline void
 1034 m_tag_prepend(struct mbuf *m, struct m_tag *t)
 1035 {
 1036 
 1037         SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
 1038 }
 1039 
 1040 /*
 1041  * Unlink a tag from the list of tags associated with an mbuf.
 1042  */
 1043 static __inline void
 1044 m_tag_unlink(struct mbuf *m, struct m_tag *t)
 1045 {
 1046 
 1047         SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
 1048 }
 1049 
 1050 /* These are for OpenBSD compatibility. */
 1051 #define MTAG_ABI_COMPAT         0               /* compatibility ABI */
 1052 
 1053 static __inline struct m_tag *
 1054 m_tag_get(int type, int length, int wait)
 1055 {
 1056         return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
 1057 }
 1058 
 1059 static __inline struct m_tag *
 1060 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
 1061 {
 1062         return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
 1063             m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
 1064 }
 1065 
 1066 /* XXX temporary FIB methods probably eventually use tags.*/
 1067 #define M_FIBSHIFT    28
 1068 #define M_FIBMASK       0x0F
 1069 
 1070 /* get the fib from an mbuf and if it is not set, return the default */
 1071 #define M_GETFIB(_m) \
 1072     ((((_m)->m_flags & M_FIB) >> M_FIBSHIFT) & M_FIBMASK)
 1073 
 1074 #define M_SETFIB(_m, _fib) do {                                         \
 1075         _m->m_flags &= ~M_FIB;                                          \
 1076         _m->m_flags |= (((_fib) << M_FIBSHIFT) & M_FIB);  \
 1077 } while (0)
 1078 
 1079 #endif /* _KERNEL */
 1080 
 1081 #ifdef MBUF_PROFILING
 1082  void m_profile(struct mbuf *m);
 1083  #define M_PROFILE(m) m_profile(m)
 1084 #else
 1085  #define M_PROFILE(m)
 1086 #endif
 1087 
 1088 
 1089 #endif /* !_SYS_MBUF_H_ */

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