The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_vjc.c

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    1 
    2 /*
    3  * ng_vjc.c
    4  *
    5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    6  * All rights reserved.
    7  * 
    8  * Subject to the following obligations and disclaimer of warranty, use and
    9  * redistribution of this software, in source or object code forms, with or
   10  * without modifications are expressly permitted by Whistle Communications;
   11  * provided, however, that:
   12  * 1. Any and all reproductions of the source or object code must include the
   13  *    copyright notice above and the following disclaimer of warranties; and
   14  * 2. No rights are granted, in any manner or form, to use Whistle
   15  *    Communications, Inc. trademarks, including the mark "WHISTLE
   16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   17  *    such appears in the above copyright notice or in the software.
   18  * 
   19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   35  * OF SUCH DAMAGE.
   36  *
   37  * Author: Archie Cobbs <archie@freebsd.org>
   38  *
   39  * $FreeBSD$
   40  * $Whistle: ng_vjc.c,v 1.17 1999/11/01 09:24:52 julian Exp $
   41  */
   42 
   43 /*
   44  * This node performs Van Jacobson IP header (de)compression.
   45  * You must have included net/slcompress.c in your kernel compilation.
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/errno.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/malloc.h>
   54 #include <sys/errno.h>
   55 
   56 #include <netgraph/ng_message.h>
   57 #include <netgraph/netgraph.h>
   58 #include <netgraph/ng_parse.h>
   59 #include <netgraph/ng_vjc.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/in_systm.h>
   63 #include <netinet/ip.h>
   64 #include <netinet/tcp.h>
   65 
   66 #include <net/slcompress.h>
   67 
   68 /* Check agreement with slcompress.c */
   69 #if MAX_STATES != NG_VJC_MAX_CHANNELS
   70 #error NG_VJC_MAX_CHANNELS must be the same as MAX_STATES
   71 #endif
   72 
   73 /* Maximum length of a compressed TCP VJ header */
   74 #define MAX_VJHEADER            19
   75 
   76 /* Node private data */
   77 struct ng_vjc_private {
   78         struct  ngm_vjc_config conf;
   79         struct  slcompress slc;
   80         hook_p  ip;
   81         hook_p  vjcomp;
   82         hook_p  vjuncomp;
   83         hook_p  vjip;
   84 };
   85 typedef struct ng_vjc_private *priv_p;
   86 
   87 #define ERROUT(x)       do { error = (x); goto done; } while (0)
   88 
   89 /* Netgraph node methods */
   90 static ng_constructor_t ng_vjc_constructor;
   91 static ng_rcvmsg_t      ng_vjc_rcvmsg;
   92 static ng_shutdown_t    ng_vjc_rmnode;
   93 static ng_newhook_t     ng_vjc_newhook;
   94 static ng_rcvdata_t     ng_vjc_rcvdata;
   95 static ng_disconnect_t  ng_vjc_disconnect;
   96 
   97 /* Helper stuff */
   98 static struct mbuf *ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP);
   99 
  100 /* Parse type for struct ngm_vjc_config */
  101 static const struct ng_parse_struct_field ng_vjc_config_type_fields[]
  102         = NG_VJC_CONFIG_TYPE_INFO;
  103 static const struct ng_parse_type ng_vjc_config_type = {
  104         &ng_parse_struct_type,
  105         &ng_vjc_config_type_fields
  106 };
  107 
  108 /* Parse type for the 'last_cs' and 'cs_next' fields in struct slcompress,
  109    which are pointers converted to integer indices, so parse them that way. */
  110 #if _MACHINE_ARCH == i386
  111 #define NG_VJC_TSTATE_PTR_TYPE  &ng_parse_uint32_type
  112 #elif _MACHINE_ARCH == alpha
  113 #define NG_VJC_TSTATE_PTR_TYPE  &ng_parse_uint64_type
  114 #else
  115 #error Unspported _MACHINE_ARCH
  116 #endif
  117 
  118 /* Parse type for the 'cs_hdr' field in a struct cstate. Ideally we would
  119    like to use a 'struct ip' type instead of a simple array of bytes. */
  120 static const struct ng_parse_fixedarray_info ng_vjc_cs_hdr_type_info = {
  121         &ng_parse_hint8_type,
  122         MAX_HDR
  123 };
  124 static const struct ng_parse_type ng_vjc_cs_hdr_type = {
  125         &ng_parse_fixedarray_type,
  126         &ng_vjc_cs_hdr_type_info
  127 };
  128 
  129 /* Parse type for a struct cstate */
  130 static const struct ng_parse_struct_field ng_vjc_cstate_type_fields[] = {
  131         { "cs_next",            NG_VJC_TSTATE_PTR_TYPE          },
  132         { "cs_hlen",            &ng_parse_uint16_type           },
  133         { "cs_id",              &ng_parse_uint8_type            },
  134         { "cs_filler",          &ng_parse_uint8_type            },
  135         { "cs_hdr",             &ng_vjc_cs_hdr_type             },
  136         { NULL }
  137 };
  138 static const struct ng_parse_type ng_vjc_cstate_type = {
  139         &ng_parse_struct_type,
  140         &ng_vjc_cstate_type_fields
  141 };
  142 
  143 /* Parse type for an array of MAX_STATES struct cstate's, ie, tstate & rstate */
  144 static const struct ng_parse_fixedarray_info ng_vjc_cstatearray_type_info = {
  145         &ng_vjc_cstate_type,
  146         MAX_STATES
  147 };
  148 static const struct ng_parse_type ng_vjc_cstatearray_type = {
  149         &ng_parse_fixedarray_type,
  150         &ng_vjc_cstatearray_type_info
  151 };
  152 
  153 /* Parse type for struct slcompress. Keep this in sync with the
  154    definition of struct slcompress defined in <net/slcompress.h> */
  155 static const struct ng_parse_struct_field ng_vjc_slcompress_type_fields[] = {
  156         { "last_cs",            NG_VJC_TSTATE_PTR_TYPE          },
  157         { "last_recv",          &ng_parse_uint8_type            },
  158         { "last_xmit",          &ng_parse_uint8_type            },
  159         { "flags",              &ng_parse_hint16_type           },
  160 #ifndef SL_NO_STATS
  161         { "sls_packets",        &ng_parse_uint32_type           },
  162         { "sls_compressed",     &ng_parse_uint32_type           },
  163         { "sls_searches",       &ng_parse_uint32_type           },
  164         { "sls_misses",         &ng_parse_uint32_type           },
  165         { "sls_uncompressedin", &ng_parse_uint32_type           },
  166         { "sls_compressedin",   &ng_parse_uint32_type           },
  167         { "sls_errorin",        &ng_parse_uint32_type           },
  168         { "sls_tossed",         &ng_parse_uint32_type           },
  169 #endif
  170         { "tstate",             &ng_vjc_cstatearray_type        },
  171         { "rstate",             &ng_vjc_cstatearray_type        },
  172         { NULL }
  173 };
  174 static const struct ng_parse_type ng_vjc_slcompress_type = {
  175         &ng_parse_struct_type,
  176         &ng_vjc_slcompress_type_fields
  177 };
  178 
  179 /* List of commands and how to convert arguments to/from ASCII */
  180 static const struct ng_cmdlist ng_vjc_cmds[] = {
  181         {
  182           NGM_VJC_COOKIE,
  183           NGM_VJC_SET_CONFIG,
  184           "setconfig",
  185           &ng_vjc_config_type,
  186           NULL
  187         },
  188         {
  189           NGM_VJC_COOKIE,
  190           NGM_VJC_GET_CONFIG,
  191           "getconfig",
  192           NULL,
  193           &ng_vjc_config_type,
  194         },
  195         {
  196           NGM_VJC_COOKIE,
  197           NGM_VJC_GET_STATE,
  198           "getstate",
  199           NULL,
  200           &ng_vjc_slcompress_type,
  201         },
  202         {
  203           NGM_VJC_COOKIE,
  204           NGM_VJC_CLR_STATS,
  205           "clrstats",
  206           NULL,
  207           NULL,
  208         },
  209         {
  210           NGM_VJC_COOKIE,
  211           NGM_VJC_RECV_ERROR,
  212           "recverror",
  213           NULL,
  214           NULL,
  215         },
  216         { 0 }
  217 };
  218 
  219 /* Node type descriptor */
  220 static struct ng_type ng_vjc_typestruct = {
  221         NG_VERSION,
  222         NG_VJC_NODE_TYPE,
  223         NULL,
  224         ng_vjc_constructor,
  225         ng_vjc_rcvmsg,
  226         ng_vjc_rmnode,
  227         ng_vjc_newhook,
  228         NULL,
  229         NULL,
  230         ng_vjc_rcvdata,
  231         ng_vjc_rcvdata,
  232         ng_vjc_disconnect,
  233         ng_vjc_cmds
  234 };
  235 NETGRAPH_INIT(vjc, &ng_vjc_typestruct);
  236 
  237 /************************************************************************
  238                         NETGRAPH NODE METHODS
  239  ************************************************************************/
  240 
  241 /*
  242  * Create a new node
  243  */
  244 static int
  245 ng_vjc_constructor(node_p *nodep)
  246 {
  247         priv_p priv;
  248         int error;
  249 
  250         /* Allocate private structure */
  251         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
  252         if (priv == NULL)
  253                 return (ENOMEM);
  254         bzero(priv, sizeof(*priv));
  255 
  256         /* Call generic node constructor */
  257         if ((error = ng_make_node_common(&ng_vjc_typestruct, nodep))) {
  258                 FREE(priv, M_NETGRAPH);
  259                 return (error);
  260         }
  261         (*nodep)->private = priv;
  262 
  263         /* Done */
  264         return (0);
  265 }
  266 
  267 /*
  268  * Add a new hook
  269  */
  270 static int
  271 ng_vjc_newhook(node_p node, hook_p hook, const char *name)
  272 {
  273         const priv_p priv = (priv_p) node->private;
  274         hook_p *hookp;
  275 
  276         /* Get hook */
  277         if (strcmp(name, NG_VJC_HOOK_IP) == 0)
  278                 hookp = &priv->ip;
  279         else if (strcmp(name, NG_VJC_HOOK_VJCOMP) == 0)
  280                 hookp = &priv->vjcomp;
  281         else if (strcmp(name, NG_VJC_HOOK_VJUNCOMP) == 0)
  282                 hookp = &priv->vjuncomp;
  283         else if (strcmp(name, NG_VJC_HOOK_VJIP) == 0)
  284                 hookp = &priv->vjip;
  285         else
  286                 return (EINVAL);
  287 
  288         /* See if already connected */
  289         if (*hookp)
  290                 return (EISCONN);
  291 
  292         /* OK */
  293         *hookp = hook;
  294         return (0);
  295 }
  296 
  297 /*
  298  * Receive a control message
  299  */
  300 static int
  301 ng_vjc_rcvmsg(node_p node, struct ng_mesg *msg,
  302               const char *raddr, struct ng_mesg **rptr)
  303 {
  304         const priv_p priv = (priv_p) node->private;
  305         struct ng_mesg *resp = NULL;
  306         int error = 0;
  307 
  308         /* Check type cookie */
  309         switch (msg->header.typecookie) {
  310         case NGM_VJC_COOKIE:
  311                 switch (msg->header.cmd) {
  312                 case NGM_VJC_SET_CONFIG:
  313                     {
  314                         struct ngm_vjc_config *const c =
  315                                 (struct ngm_vjc_config *) msg->data;
  316 
  317                         if (msg->header.arglen != sizeof(*c))
  318                                 ERROUT(EINVAL);
  319                         if ((priv->conf.enableComp || priv->conf.enableDecomp)
  320                             && (c->enableComp || c->enableDecomp))
  321                                 ERROUT(EALREADY);
  322                         if (c->enableComp) {
  323                                 if (c->maxChannel > NG_VJC_MAX_CHANNELS - 1
  324                                     || c->maxChannel < NG_VJC_MIN_CHANNELS - 1)
  325                                         ERROUT(EINVAL);
  326                         } else
  327                                 c->maxChannel = NG_VJC_MAX_CHANNELS - 1;
  328                         if (c->enableComp != 0 || c->enableDecomp != 0) {
  329                                 bzero(&priv->slc, sizeof(priv->slc));
  330                                 sl_compress_init(&priv->slc, c->maxChannel);
  331                         }
  332                         priv->conf = *c;
  333                         break;
  334                     }
  335                 case NGM_VJC_GET_CONFIG:
  336                     {
  337                         struct ngm_vjc_config *conf;
  338 
  339                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  340                         if (resp == NULL)
  341                                 ERROUT(ENOMEM);
  342                         conf = (struct ngm_vjc_config *)resp->data;
  343                         *conf = priv->conf;
  344                         break;
  345                     }
  346                 case NGM_VJC_GET_STATE:
  347                     {
  348                         const struct slcompress *const sl0 = &priv->slc;
  349                         struct slcompress *sl;
  350                         u_int16_t index;
  351                         int i;
  352 
  353                         /* Get response structure */
  354                         NG_MKRESPONSE(resp, msg, sizeof(*sl), M_NOWAIT);
  355                         if (resp == NULL)
  356                                 ERROUT(ENOMEM);
  357                         sl = (struct slcompress *)resp->data;
  358                         *sl = *sl0;
  359 
  360                         /* Replace pointers with integer indicies */
  361                         if (sl->last_cs != NULL) {
  362                                 index = sl0->last_cs - sl0->tstate;
  363                                 bzero(&sl->last_cs, sizeof(sl->last_cs));
  364                                 *((u_int16_t *)&sl->last_cs) = index;
  365                         }
  366                         for (i = 0; i < MAX_STATES; i++) {
  367                                 struct cstate *const cs = &sl->tstate[i];
  368 
  369                                 index = sl0->tstate[i].cs_next - sl0->tstate;
  370                                 bzero(&cs->cs_next, sizeof(cs->cs_next));
  371                                 *((u_int16_t *)&cs->cs_next) = index;
  372                         }
  373                         break;
  374                     }
  375                 case NGM_VJC_CLR_STATS:
  376                         priv->slc.sls_packets = 0;
  377                         priv->slc.sls_compressed = 0;
  378                         priv->slc.sls_searches = 0;
  379                         priv->slc.sls_misses = 0;
  380                         priv->slc.sls_uncompressedin = 0;
  381                         priv->slc.sls_compressedin = 0;
  382                         priv->slc.sls_errorin = 0;
  383                         priv->slc.sls_tossed = 0;
  384                         break;
  385                 case NGM_VJC_RECV_ERROR:
  386                         sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &priv->slc);
  387                         break;
  388                 default:
  389                         error = EINVAL;
  390                         break;
  391                 }
  392                 break;
  393         default:
  394                 error = EINVAL;
  395                 break;
  396         }
  397         if (rptr)
  398                 *rptr = resp;
  399         else if (resp)
  400                 FREE(resp, M_NETGRAPH);
  401 
  402 done:
  403         FREE(msg, M_NETGRAPH);
  404         return (error);
  405 }
  406 
  407 /*
  408  * Receive data
  409  */
  410 static int
  411 ng_vjc_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  412 {
  413         const node_p node = hook->node;
  414         const priv_p priv = (priv_p) node->private;
  415         int error = 0;
  416 
  417         if (hook == priv->ip) {                 /* outgoing packet */
  418                 u_int type = TYPE_IP;
  419 
  420                 /* Compress packet if enabled and proto is TCP */
  421                 if (priv->conf.enableComp) {
  422                         struct ip *ip;
  423 
  424                         if ((m = ng_vjc_pulluphdrs(m, 0)) == NULL) {
  425                                 NG_FREE_META(meta);
  426                                 return (ENOBUFS);
  427                         }
  428                         ip = mtod(m, struct ip *);
  429                         if (ip->ip_p == IPPROTO_TCP) {
  430                                 const int origLen = m->m_len;
  431 
  432                                 type = sl_compress_tcp(m, ip,
  433                                     &priv->slc, priv->conf.compressCID);
  434                                 m->m_pkthdr.len += m->m_len - origLen;
  435                         }
  436                 }
  437 
  438                 /* Dispatch to the appropriate outgoing hook */
  439                 switch (type) {
  440                 case TYPE_IP:
  441                         hook = priv->vjip;
  442                         break;
  443                 case TYPE_UNCOMPRESSED_TCP:
  444                         hook = priv->vjuncomp;
  445                         break;
  446                 case TYPE_COMPRESSED_TCP:
  447                         hook = priv->vjcomp;
  448                         break;
  449                 default:
  450                         panic("%s: type=%d", __FUNCTION__, type);
  451                 }
  452         } else if (hook == priv->vjcomp) {      /* incoming compressed packet */
  453                 int vjlen, need2pullup;
  454                 struct mbuf *hm;
  455                 u_char *hdr;
  456                 u_int hlen;
  457 
  458                 /* Are we decompressing? */
  459                 if (!priv->conf.enableDecomp) {
  460                         NG_FREE_DATA(m, meta);
  461                         return (ENXIO);
  462                 }
  463 
  464                 /* Pull up the necessary amount from the mbuf */
  465                 need2pullup = MAX_VJHEADER;
  466                 if (need2pullup > m->m_pkthdr.len)
  467                         need2pullup = m->m_pkthdr.len;
  468                 if (m->m_len < need2pullup
  469                     && (m = m_pullup(m, need2pullup)) == NULL) {
  470                         priv->slc.sls_errorin++;
  471                         NG_FREE_META(meta);
  472                         return (ENOBUFS);
  473                 }
  474 
  475                 /* Uncompress packet to reconstruct TCP/IP header */
  476                 vjlen = sl_uncompress_tcp_core(mtod(m, u_char *),
  477                     m->m_len, m->m_pkthdr.len, TYPE_COMPRESSED_TCP,
  478                     &priv->slc, &hdr, &hlen);
  479                 if (vjlen <= 0) {
  480                         NG_FREE_DATA(m, meta);
  481                         return (EINVAL);
  482                 }
  483                 m_adj(m, vjlen);
  484 
  485                 /* Copy the reconstructed TCP/IP headers into a new mbuf */
  486                 MGETHDR(hm, M_DONTWAIT, MT_DATA);
  487                 if (hm == NULL) {
  488                         priv->slc.sls_errorin++;
  489                         NG_FREE_DATA(m, meta);
  490                         return (ENOBUFS);
  491                 }
  492                 hm->m_len = 0;
  493                 hm->m_pkthdr.rcvif = NULL;
  494                 if (hlen > MHLEN) {             /* unlikely, but can happen */
  495                         MCLGET(hm, M_DONTWAIT);
  496                         if ((hm->m_flags & M_EXT) == 0) {
  497                                 m_freem(hm);
  498                                 priv->slc.sls_errorin++;
  499                                 NG_FREE_DATA(m, meta);
  500                                 return (ENOBUFS);
  501                         }
  502                 }
  503                 bcopy(hdr, mtod(hm, u_char *), hlen);
  504                 hm->m_len = hlen;
  505 
  506                 /* Glue TCP/IP headers and rest of packet together */
  507                 hm->m_next = m;
  508                 hm->m_pkthdr.len = hlen + m->m_pkthdr.len;
  509                 m = hm;
  510                 hook = priv->ip;
  511         } else if (hook == priv->vjuncomp) {    /* incoming uncompressed pkt */
  512                 u_char *hdr;
  513                 u_int hlen;
  514 
  515                 /* Are we decompressing? */
  516                 if (!priv->conf.enableDecomp) {
  517                         NG_FREE_DATA(m, meta);
  518                         return (ENXIO);
  519                 }
  520 
  521                 /* Pull up IP+TCP headers */
  522                 if ((m = ng_vjc_pulluphdrs(m, 1)) == NULL) {
  523                         NG_FREE_META(meta);
  524                         return (ENOBUFS);
  525                 }
  526 
  527                 /* Run packet through uncompressor */
  528                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
  529                     m->m_len, m->m_pkthdr.len, TYPE_UNCOMPRESSED_TCP,
  530                     &priv->slc, &hdr, &hlen) < 0) {
  531                         NG_FREE_DATA(m, meta);
  532                         return (EINVAL);
  533                 }
  534                 hook = priv->ip;
  535         } else if (hook == priv->vjip)  /* incoming regular packet (bypass) */
  536                 hook = priv->ip;
  537         else
  538                 panic("%s: unknown hook", __FUNCTION__);
  539 
  540         /* Send result back out */
  541         NG_SEND_DATA(error, hook, m, meta);
  542         return (error);
  543 }
  544 
  545 /*
  546  * Shutdown node
  547  */
  548 static int
  549 ng_vjc_rmnode(node_p node)
  550 {
  551         const priv_p priv = (priv_p) node->private;
  552 
  553         node->flags |= NG_INVALID;
  554         ng_cutlinks(node);
  555         ng_unname(node);
  556         bzero(priv, sizeof(*priv));
  557         FREE(priv, M_NETGRAPH);
  558         node->private = NULL;
  559         ng_unref(node);
  560         return (0);
  561 }
  562 
  563 /*
  564  * Hook disconnection
  565  */
  566 static int
  567 ng_vjc_disconnect(hook_p hook)
  568 {
  569         const node_p node = hook->node;
  570         const priv_p priv = node->private;
  571 
  572         /* Zero out hook pointer */
  573         if (hook == priv->ip)
  574                 priv->ip = NULL;
  575         else if (hook == priv->vjcomp)
  576                 priv->vjcomp = NULL;
  577         else if (hook == priv->vjuncomp)
  578                 priv->vjuncomp = NULL;
  579         else if (hook == priv->vjip)
  580                 priv->vjip = NULL;
  581         else
  582                 panic("%s: unknown hook", __FUNCTION__);
  583 
  584         /* Go away if no hooks left */
  585         if (node->numhooks == 0)
  586                 ng_rmnode(node);
  587         return (0);
  588 }
  589 
  590 /************************************************************************
  591                         HELPER STUFF
  592  ************************************************************************/
  593 
  594 /*
  595  * Pull up the full IP and TCP headers of a packet. If packet is not
  596  * a TCP packet, just pull up the IP header.
  597  */
  598 static struct mbuf *
  599 ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP)
  600 {
  601         struct ip *ip;
  602         struct tcphdr *tcp;
  603         int ihlen, thlen;
  604 
  605         if (m->m_len < sizeof(*ip) && (m = m_pullup(m, sizeof(*ip))) == NULL)
  606                 return (NULL);
  607         ip = mtod(m, struct ip *);
  608         if (!knownTCP && ip->ip_p != IPPROTO_TCP)
  609                 return (m);
  610         ihlen = ip->ip_hl << 2;
  611         if (m->m_len < ihlen + sizeof(*tcp)) {
  612                 if ((m = m_pullup(m, ihlen + sizeof(*tcp))) == NULL)
  613                         return (NULL);
  614                 ip = mtod(m, struct ip *);
  615         }
  616         tcp = (struct tcphdr *)((u_char *)ip + ihlen);
  617         thlen = tcp->th_off << 2;
  618         if (m->m_len < ihlen + thlen)
  619                 m = m_pullup(m, ihlen + thlen);
  620         return (m);
  621 }
  622 

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