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 
    6 /*-
    7  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    8  * All rights reserved.
    9  * 
   10  * Subject to the following obligations and disclaimer of warranty, use and
   11  * redistribution of this software, in source or object code forms, with or
   12  * without modifications are expressly permitted by Whistle Communications;
   13  * provided, however, that:
   14  * 1. Any and all reproductions of the source or object code must include the
   15  *    copyright notice above and the following disclaimer of warranties; and
   16  * 2. No rights are granted, in any manner or form, to use Whistle
   17  *    Communications, Inc. trademarks, including the mark "WHISTLE
   18  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   19  *    such appears in the above copyright notice or in the software.
   20  * 
   21  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   22  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   23  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   24  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   26  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   27  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   28  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   29  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   30  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   31  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   32  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   33  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   36  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   37  * OF SUCH DAMAGE.
   38  *
   39  * Author: Archie Cobbs <archie@freebsd.org>
   40  *
   41  * $FreeBSD: stable/8/sys/netgraph/ng_vjc.c 199583 2009-11-20 15:27:52Z jhb $
   42  * $Whistle: ng_vjc.c,v 1.17 1999/11/01 09:24:52 julian Exp $
   43  */
   44 
   45 /*
   46  * This node performs Van Jacobson IP header (de)compression.
   47  * You must have included net/slcompress.c in your kernel compilation.
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/errno.h>
   53 #include <sys/kernel.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/malloc.h>
   56 #include <sys/errno.h>
   57 
   58 #include <netgraph/ng_message.h>
   59 #include <netgraph/netgraph.h>
   60 #include <netgraph/ng_parse.h>
   61 #include <netgraph/ng_vjc.h>
   62 
   63 #include <netinet/in.h>
   64 #include <netinet/in_systm.h>
   65 #include <netinet/ip.h>
   66 #include <netinet/tcp.h>
   67 
   68 #include <net/slcompress.h>
   69 
   70 /* Check agreement with slcompress.c */
   71 #if MAX_STATES != NG_VJC_MAX_CHANNELS
   72 #error NG_VJC_MAX_CHANNELS must be the same as MAX_STATES
   73 #endif
   74 
   75 /* Maximum length of a compressed TCP VJ header */
   76 #define MAX_VJHEADER            19
   77 
   78 /* Node private data */
   79 struct ng_vjc_private {
   80         struct  ngm_vjc_config conf;
   81         struct  slcompress slc;
   82         hook_p  ip;
   83         hook_p  vjcomp;
   84         hook_p  vjuncomp;
   85         hook_p  vjip;
   86 };
   87 typedef struct ng_vjc_private *priv_p;
   88 
   89 #define ERROUT(x)       do { error = (x); goto done; } while (0)
   90 
   91 /* Netgraph node methods */
   92 static ng_constructor_t ng_vjc_constructor;
   93 static ng_rcvmsg_t      ng_vjc_rcvmsg;
   94 static ng_shutdown_t    ng_vjc_shutdown;
   95 static ng_newhook_t     ng_vjc_newhook;
   96 static ng_rcvdata_t     ng_vjc_rcvdata;
   97 static ng_disconnect_t  ng_vjc_disconnect;
   98 
   99 /* Helper stuff */
  100 static struct mbuf *ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP);
  101 
  102 /* Parse type for struct ngm_vjc_config */
  103 static const struct ng_parse_struct_field ng_vjc_config_type_fields[]
  104         = NG_VJC_CONFIG_TYPE_INFO;
  105 static const struct ng_parse_type ng_vjc_config_type = {
  106         &ng_parse_struct_type,
  107         &ng_vjc_config_type_fields
  108 };
  109 
  110 /* Parse type for the 'last_cs' and 'cs_next' fields in struct slcompress,
  111    which are pointers converted to integer indices, so parse them that way. */
  112 #ifndef __LP64__
  113 #define NG_VJC_TSTATE_PTR_TYPE  &ng_parse_uint32_type
  114 #else
  115 #define NG_VJC_TSTATE_PTR_TYPE  &ng_parse_uint64_type
  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         .version =      NG_ABI_VERSION,
  222         .name =         NG_VJC_NODE_TYPE,
  223         .constructor =  ng_vjc_constructor,
  224         .rcvmsg =       ng_vjc_rcvmsg,
  225         .shutdown =     ng_vjc_shutdown,
  226         .newhook =      ng_vjc_newhook,
  227         .rcvdata =      ng_vjc_rcvdata,
  228         .disconnect =   ng_vjc_disconnect,
  229         .cmdlist =      ng_vjc_cmds,
  230 };
  231 NETGRAPH_INIT(vjc, &ng_vjc_typestruct);
  232 
  233 /************************************************************************
  234                         NETGRAPH NODE METHODS
  235  ************************************************************************/
  236 
  237 /*
  238  * Create a new node
  239  */
  240 static int
  241 ng_vjc_constructor(node_p node)
  242 {
  243         priv_p priv;
  244 
  245         /* Allocate private structure */
  246         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  247         if (priv == NULL)
  248                 return (ENOMEM);
  249 
  250         NG_NODE_SET_PRIVATE(node, priv);
  251 
  252         /* slcompress is not thread-safe. Protect it's state here. */
  253         NG_NODE_FORCE_WRITER(node);
  254 
  255         /* Done */
  256         return (0);
  257 }
  258 
  259 /*
  260  * Add a new hook
  261  */
  262 static int
  263 ng_vjc_newhook(node_p node, hook_p hook, const char *name)
  264 {
  265         const priv_p priv = NG_NODE_PRIVATE(node);
  266         hook_p *hookp;
  267 
  268         /* Get hook */
  269         if (strcmp(name, NG_VJC_HOOK_IP) == 0)
  270                 hookp = &priv->ip;
  271         else if (strcmp(name, NG_VJC_HOOK_VJCOMP) == 0)
  272                 hookp = &priv->vjcomp;
  273         else if (strcmp(name, NG_VJC_HOOK_VJUNCOMP) == 0)
  274                 hookp = &priv->vjuncomp;
  275         else if (strcmp(name, NG_VJC_HOOK_VJIP) == 0)
  276                 hookp = &priv->vjip;
  277         else
  278                 return (EINVAL);
  279 
  280         /* See if already connected */
  281         if (*hookp)
  282                 return (EISCONN);
  283 
  284         /* OK */
  285         *hookp = hook;
  286         return (0);
  287 }
  288 
  289 /*
  290  * Receive a control message
  291  */
  292 static int
  293 ng_vjc_rcvmsg(node_p node, item_p item, hook_p lasthook)
  294 {
  295         const priv_p priv = NG_NODE_PRIVATE(node);
  296         struct ng_mesg *resp = NULL;
  297         int error = 0;
  298         struct ng_mesg *msg;
  299 
  300         NGI_GET_MSG(item, msg);
  301         /* Check type cookie */
  302         switch (msg->header.typecookie) {
  303         case NGM_VJC_COOKIE:
  304                 switch (msg->header.cmd) {
  305                 case NGM_VJC_SET_CONFIG:
  306                     {
  307                         struct ngm_vjc_config *const c =
  308                                 (struct ngm_vjc_config *) msg->data;
  309 
  310                         if (msg->header.arglen != sizeof(*c))
  311                                 ERROUT(EINVAL);
  312                         if ((priv->conf.enableComp || priv->conf.enableDecomp)
  313                             && (c->enableComp || c->enableDecomp))
  314                                 ERROUT(EALREADY);
  315                         if (c->enableComp) {
  316                                 if (c->maxChannel > NG_VJC_MAX_CHANNELS - 1
  317                                     || c->maxChannel < NG_VJC_MIN_CHANNELS - 1)
  318                                         ERROUT(EINVAL);
  319                         } else
  320                                 c->maxChannel = NG_VJC_MAX_CHANNELS - 1;
  321                         if (c->enableComp != 0 || c->enableDecomp != 0) {
  322                                 bzero(&priv->slc, sizeof(priv->slc));
  323                                 sl_compress_init(&priv->slc, c->maxChannel);
  324                         }
  325                         priv->conf = *c;
  326                         break;
  327                     }
  328                 case NGM_VJC_GET_CONFIG:
  329                     {
  330                         struct ngm_vjc_config *conf;
  331 
  332                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  333                         if (resp == NULL)
  334                                 ERROUT(ENOMEM);
  335                         conf = (struct ngm_vjc_config *)resp->data;
  336                         *conf = priv->conf;
  337                         break;
  338                     }
  339                 case NGM_VJC_GET_STATE:
  340                     {
  341                         const struct slcompress *const sl0 = &priv->slc;
  342                         struct slcompress *sl;
  343                         u_int16_t index;
  344                         int i;
  345 
  346                         /* Get response structure */
  347                         NG_MKRESPONSE(resp, msg, sizeof(*sl), M_NOWAIT);
  348                         if (resp == NULL)
  349                                 ERROUT(ENOMEM);
  350                         sl = (struct slcompress *)resp->data;
  351                         *sl = *sl0;
  352 
  353                         /* Replace pointers with integer indicies */
  354                         if (sl->last_cs != NULL) {
  355                                 index = sl0->last_cs - sl0->tstate;
  356                                 bzero(&sl->last_cs, sizeof(sl->last_cs));
  357                                 *((u_int16_t *)&sl->last_cs) = index;
  358                         }
  359                         for (i = 0; i < MAX_STATES; i++) {
  360                                 struct cstate *const cs = &sl->tstate[i];
  361 
  362                                 index = sl0->tstate[i].cs_next - sl0->tstate;
  363                                 bzero(&cs->cs_next, sizeof(cs->cs_next));
  364                                 *((u_int16_t *)&cs->cs_next) = index;
  365                         }
  366                         break;
  367                     }
  368                 case NGM_VJC_CLR_STATS:
  369                         priv->slc.sls_packets = 0;
  370                         priv->slc.sls_compressed = 0;
  371                         priv->slc.sls_searches = 0;
  372                         priv->slc.sls_misses = 0;
  373                         priv->slc.sls_uncompressedin = 0;
  374                         priv->slc.sls_compressedin = 0;
  375                         priv->slc.sls_errorin = 0;
  376                         priv->slc.sls_tossed = 0;
  377                         break;
  378                 case NGM_VJC_RECV_ERROR:
  379                         sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &priv->slc);
  380                         break;
  381                 default:
  382                         error = EINVAL;
  383                         break;
  384                 }
  385                 break;
  386         default:
  387                 error = EINVAL;
  388                 break;
  389         }
  390 done:
  391         NG_RESPOND_MSG(error, node, item, resp);
  392         NG_FREE_MSG(msg);
  393         return (error);
  394 }
  395 
  396 /*
  397  * Receive data
  398  */
  399 static int
  400 ng_vjc_rcvdata(hook_p hook, item_p item)
  401 {
  402         const node_p node = NG_HOOK_NODE(hook);
  403         const priv_p priv = NG_NODE_PRIVATE(node);
  404         int error = 0;
  405         struct mbuf *m;
  406 
  407         NGI_GET_M(item, m);
  408         if (hook == priv->ip) {                 /* outgoing packet */
  409                 u_int type = TYPE_IP;
  410 
  411                 /* Compress packet if enabled and proto is TCP */
  412                 if (priv->conf.enableComp) {
  413                         struct ip *ip;
  414 
  415                         if ((m = ng_vjc_pulluphdrs(m, 0)) == NULL) {
  416                                 NG_FREE_ITEM(item);
  417                                 return (ENOBUFS);
  418                         }
  419                         ip = mtod(m, struct ip *);
  420                         if (ip->ip_p == IPPROTO_TCP) {
  421                                 const int origLen = m->m_len;
  422 
  423                                 type = sl_compress_tcp(m, ip,
  424                                     &priv->slc, priv->conf.compressCID);
  425                                 m->m_pkthdr.len += m->m_len - origLen;
  426                         }
  427                 }
  428 
  429                 /* Dispatch to the appropriate outgoing hook */
  430                 switch (type) {
  431                 case TYPE_IP:
  432                         hook = priv->vjip;
  433                         break;
  434                 case TYPE_UNCOMPRESSED_TCP:
  435                         hook = priv->vjuncomp;
  436                         break;
  437                 case TYPE_COMPRESSED_TCP:
  438                         hook = priv->vjcomp;
  439                         break;
  440                 default:
  441                         panic("%s: type=%d", __func__, type);
  442                 }
  443         } else if (hook == priv->vjcomp) {      /* incoming compressed packet */
  444                 int vjlen, need2pullup;
  445                 struct mbuf *hm;
  446                 u_char *hdr;
  447                 u_int hlen;
  448 
  449                 /* Are we decompressing? */
  450                 if (!priv->conf.enableDecomp) {
  451                         NG_FREE_M(m);
  452                         NG_FREE_ITEM(item);
  453                         return (ENXIO);
  454                 }
  455 
  456                 /* Pull up the necessary amount from the mbuf */
  457                 need2pullup = MAX_VJHEADER;
  458                 if (need2pullup > m->m_pkthdr.len)
  459                         need2pullup = m->m_pkthdr.len;
  460                 if (m->m_len < need2pullup
  461                     && (m = m_pullup(m, need2pullup)) == NULL) {
  462                         priv->slc.sls_errorin++;
  463                         NG_FREE_ITEM(item);
  464                         return (ENOBUFS);
  465                 }
  466 
  467                 /* Uncompress packet to reconstruct TCP/IP header */
  468                 vjlen = sl_uncompress_tcp_core(mtod(m, u_char *),
  469                     m->m_len, m->m_pkthdr.len, TYPE_COMPRESSED_TCP,
  470                     &priv->slc, &hdr, &hlen);
  471                 if (vjlen <= 0) {
  472                         NG_FREE_M(m);
  473                         NG_FREE_ITEM(item);
  474                         return (EINVAL);
  475                 }
  476                 m_adj(m, vjlen);
  477 
  478                 /* Copy the reconstructed TCP/IP headers into a new mbuf */
  479                 MGETHDR(hm, M_DONTWAIT, MT_DATA);
  480                 if (hm == NULL) {
  481                         priv->slc.sls_errorin++;
  482                         NG_FREE_M(m);
  483                         NG_FREE_ITEM(item);
  484                         return (ENOBUFS);
  485                 }
  486                 hm->m_len = 0;
  487                 hm->m_pkthdr.rcvif = NULL;
  488                 if (hlen > MHLEN) {             /* unlikely, but can happen */
  489                         MCLGET(hm, M_DONTWAIT);
  490                         if ((hm->m_flags & M_EXT) == 0) {
  491                                 m_freem(hm);
  492                                 priv->slc.sls_errorin++;
  493                                 NG_FREE_M(m);
  494                                 NG_FREE_ITEM(item);
  495                                 return (ENOBUFS);
  496                         }
  497                 }
  498                 bcopy(hdr, mtod(hm, u_char *), hlen);
  499                 hm->m_len = hlen;
  500 
  501                 /* Glue TCP/IP headers and rest of packet together */
  502                 hm->m_next = m;
  503                 hm->m_pkthdr.len = hlen + m->m_pkthdr.len;
  504                 m = hm;
  505                 hook = priv->ip;
  506         } else if (hook == priv->vjuncomp) {    /* incoming uncompressed pkt */
  507                 u_char *hdr;
  508                 u_int hlen;
  509 
  510                 /* Are we decompressing? */
  511                 if (!priv->conf.enableDecomp) {
  512                         NG_FREE_M(m);
  513                         NG_FREE_ITEM(item);
  514                         return (ENXIO);
  515                 }
  516 
  517                 /* Pull up IP+TCP headers */
  518                 if ((m = ng_vjc_pulluphdrs(m, 1)) == NULL) {
  519                         NG_FREE_ITEM(item);
  520                         return (ENOBUFS);
  521                 }
  522 
  523                 /* Run packet through uncompressor */
  524                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
  525                     m->m_len, m->m_pkthdr.len, TYPE_UNCOMPRESSED_TCP,
  526                     &priv->slc, &hdr, &hlen) < 0) {
  527                         NG_FREE_M(m);
  528                         NG_FREE_ITEM(item);
  529                         return (EINVAL);
  530                 }
  531                 hook = priv->ip;
  532         } else if (hook == priv->vjip)  /* incoming regular packet (bypass) */
  533                 hook = priv->ip;
  534         else
  535                 panic("%s: unknown hook", __func__);
  536 
  537         /* Send result back out */
  538         NG_FWD_NEW_DATA(error, item, hook, m);
  539         return (error);
  540 }
  541 
  542 /*
  543  * Shutdown node
  544  */
  545 static int
  546 ng_vjc_shutdown(node_p node)
  547 {
  548         const priv_p priv = NG_NODE_PRIVATE(node);
  549 
  550         bzero(priv, sizeof(*priv));
  551         free(priv, M_NETGRAPH);
  552         NG_NODE_SET_PRIVATE(node, NULL);
  553         NG_NODE_UNREF(node);
  554         return (0);
  555 }
  556 
  557 /*
  558  * Hook disconnection
  559  */
  560 static int
  561 ng_vjc_disconnect(hook_p hook)
  562 {
  563         const node_p node = NG_HOOK_NODE(hook);
  564         const priv_p priv = NG_NODE_PRIVATE(node);
  565 
  566         /* Zero out hook pointer */
  567         if (hook == priv->ip)
  568                 priv->ip = NULL;
  569         else if (hook == priv->vjcomp)
  570                 priv->vjcomp = NULL;
  571         else if (hook == priv->vjuncomp)
  572                 priv->vjuncomp = NULL;
  573         else if (hook == priv->vjip)
  574                 priv->vjip = NULL;
  575         else
  576                 panic("%s: unknown hook", __func__);
  577 
  578         /* Go away if no hooks left */
  579         if ((NG_NODE_NUMHOOKS(node) == 0)
  580         && (NG_NODE_IS_VALID(node)))
  581                 ng_rmnode_self(node);
  582         return (0);
  583 }
  584 
  585 /************************************************************************
  586                         HELPER STUFF
  587  ************************************************************************/
  588 
  589 /*
  590  * Pull up the full IP and TCP headers of a packet. If packet is not
  591  * a TCP packet, just pull up the IP header.
  592  */
  593 static struct mbuf *
  594 ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP)
  595 {
  596         struct ip *ip;
  597         struct tcphdr *tcp;
  598         int ihlen, thlen;
  599 
  600         if (m->m_len < sizeof(*ip) && (m = m_pullup(m, sizeof(*ip))) == NULL)
  601                 return (NULL);
  602         ip = mtod(m, struct ip *);
  603         if (!knownTCP && ip->ip_p != IPPROTO_TCP)
  604                 return (m);
  605         ihlen = ip->ip_hl << 2;
  606         if (m->m_len < ihlen + sizeof(*tcp)) {
  607                 if ((m = m_pullup(m, ihlen + sizeof(*tcp))) == NULL)
  608                         return (NULL);
  609                 ip = mtod(m, struct ip *);
  610         }
  611         tcp = (struct tcphdr *)((u_char *)ip + ihlen);
  612         thlen = tcp->th_off << 2;
  613         if (m->m_len < ihlen + thlen)
  614                 m = m_pullup(m, ihlen + thlen);
  615         return (m);
  616 }
  617 

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