The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_rfc1490.c

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    1 
    2 /*
    3  * ng_rfc1490.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: Julian Elischer <julian@freebsd.org>
   38  *
   39  * $FreeBSD: releng/5.2/sys/netgraph/ng_rfc1490.c 111119 2003-02-19 05:47:46Z imp $
   40  * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
   41  */
   42 
   43 /*
   44  * This node does RFC 1490 multiplexing.
   45  *
   46  * NOTE: RFC 1490 is updated by RFC 2427.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/errno.h>
   52 #include <sys/kernel.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/errno.h>
   56 #include <sys/socket.h>
   57 
   58 #include <net/if.h>
   59 #include <netinet/in.h>
   60 #include <netinet/if_ether.h>
   61 
   62 #include <netgraph/ng_message.h>
   63 #include <netgraph/netgraph.h>
   64 #include <netgraph/ng_rfc1490.h>
   65 
   66 /*
   67  * DEFINITIONS
   68  */
   69 
   70 /* Q.922 stuff -- see RFC 1490 */
   71 #define HDLC_UI         0x03
   72 
   73 #define NLPID_IP        0xCC
   74 #define NLPID_PPP       0xCF
   75 #define NLPID_SNAP      0x80
   76 #define NLPID_Q933      0x08
   77 #define NLPID_CLNP      0x81
   78 #define NLPID_ESIS      0x82
   79 #define NLPID_ISIS      0x83
   80 
   81 /* Node private data */
   82 struct ng_rfc1490_private {
   83         hook_p  downlink;
   84         hook_p  ppp;
   85         hook_p  inet;
   86 };
   87 typedef struct ng_rfc1490_private *priv_p;
   88 
   89 /* Netgraph node methods */
   90 static ng_constructor_t ng_rfc1490_constructor;
   91 static ng_rcvmsg_t      ng_rfc1490_rcvmsg;
   92 static ng_shutdown_t    ng_rfc1490_shutdown;
   93 static ng_newhook_t     ng_rfc1490_newhook;
   94 static ng_rcvdata_t     ng_rfc1490_rcvdata;
   95 static ng_disconnect_t  ng_rfc1490_disconnect;
   96 
   97 /* Node type descriptor */
   98 static struct ng_type typestruct = {
   99         NG_ABI_VERSION,
  100         NG_RFC1490_NODE_TYPE,
  101         NULL,
  102         ng_rfc1490_constructor,
  103         ng_rfc1490_rcvmsg,
  104         ng_rfc1490_shutdown,
  105         ng_rfc1490_newhook,
  106         NULL,
  107         NULL,
  108         ng_rfc1490_rcvdata,
  109         ng_rfc1490_disconnect,
  110         NULL
  111 };
  112 NETGRAPH_INIT(rfc1490, &typestruct);
  113 
  114 /************************************************************************
  115                         NETGRAPH NODE STUFF
  116  ************************************************************************/
  117 
  118 /*
  119  * Node constructor
  120  */
  121 static int
  122 ng_rfc1490_constructor(node_p node)
  123 {
  124         priv_p priv;
  125 
  126         /* Allocate private structure */
  127         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  128         if (priv == NULL)
  129                 return (ENOMEM);
  130 
  131         NG_NODE_SET_PRIVATE(node, priv);
  132 
  133         /* Done */
  134         return (0);
  135 }
  136 
  137 /*
  138  * Give our ok for a hook to be added
  139  */
  140 static int
  141 ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
  142 {
  143         const priv_p priv = NG_NODE_PRIVATE(node);
  144 
  145         if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
  146                 if (priv->downlink)
  147                         return (EISCONN);
  148                 priv->downlink = hook;
  149         } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
  150                 if (priv->ppp)
  151                         return (EISCONN);
  152                 priv->ppp = hook;
  153         } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
  154                 if (priv->inet)
  155                         return (EISCONN);
  156                 priv->inet = hook;
  157         } else
  158                 return (EINVAL);
  159         return (0);
  160 }
  161 
  162 /*
  163  * Receive a control message. We don't support any special ones.
  164  */
  165 static int
  166 ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook)
  167 {
  168         NG_FREE_ITEM(item);
  169         return (EINVAL);
  170 }
  171 
  172 /*
  173  * Receive data on a hook and encapsulate according to RFC 1490.
  174  * Only those nodes marked (*) are supported by this routine so far.
  175  *
  176  *                            Q.922 control
  177  *                                 |
  178  *                                 |
  179  *            --------------------------------------------
  180  *            | 0x03                                     |
  181  *           UI                                       I Frame
  182  *            |                                          |
  183  *      ---------------------------------         --------------
  184  *      | 0x08  | 0x81  |0xCC   |0xCF   | 0x00    |..01....    |..10....
  185  *      |       |       |       |       | 0x80    |            |
  186  *     Q.933   CLNP    IP(*)   PPP(*)  SNAP     ISO 8208    ISO 8208
  187  *      |                    (rfc1973)  |       Modulo 8    Modulo 128
  188  *      |                               |
  189  *      --------------------           OUI
  190  *      |                  |            |
  191  *     L2 ID              L3 ID      -------------------------
  192  *      |               User         |00-80-C2               |00-00-00
  193  *      |               specified    |                       |
  194  *      |               0x70        PID                     Ethertype
  195  *      |                            |                       |
  196  *      -------------------        --------------...        ----------
  197  *      |0x51 |0x4E |     |0x4C    |0x1   |0xB  |           |0x806   |
  198  *      |     |     |     |        |      |     |           |        |
  199  *     7776  Q.922 Others 802.2   802.3  802.6 Others       ARP(*)  Others
  200  *
  201  *
  202  */
  203 
  204 #define MAX_ENCAPS_HDR  8
  205 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  206 #define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
  207 
  208 static int
  209 ng_rfc1490_rcvdata(hook_p hook, item_p item)
  210 {
  211         const node_p node = NG_HOOK_NODE(hook);
  212         const priv_p priv = NG_NODE_PRIVATE(node);
  213         int error = 0;
  214         struct mbuf *m;
  215 
  216         NGI_GET_M(item, m);
  217         if (hook == priv->downlink) {
  218                 const u_char *start;
  219                 const u_char *ptr;
  220 
  221                 if (!m || (m->m_len < MAX_ENCAPS_HDR
  222                     && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
  223                         ERROUT(ENOBUFS);
  224                 ptr = start = mtod(m, const u_char *);
  225 
  226                 /* Must be UI frame */
  227                 if (*ptr++ != HDLC_UI)
  228                         ERROUT(0);
  229 
  230                 /* Eat optional zero pad byte */
  231                 if (*ptr == 0x00)
  232                         ptr++;
  233 
  234                 /* Multiplex on NLPID */
  235                 switch (*ptr++) {
  236                 case NLPID_SNAP:
  237                         if (OUICMP(ptr, 0, 0, 0)) {     /* It's an ethertype */
  238                                 u_int16_t etype;
  239 
  240                                 ptr += 3;
  241                                 etype = ntohs(*((const u_int16_t *)ptr));
  242                                 ptr += 2;
  243                                 m_adj(m, ptr - start);
  244                                 switch (etype) {
  245                                 case ETHERTYPE_IP:
  246                                         NG_FWD_NEW_DATA(error, item,
  247                                             priv->inet, m);
  248                                         break;
  249                                 case ETHERTYPE_ARP:
  250                                 case ETHERTYPE_REVARP:
  251                                 default:
  252                                         ERROUT(0);
  253                                 }
  254                         } else if (OUICMP(ptr, 0x00, 0x80, 0xc2))       /* 802.1 bridging */
  255                                 ERROUT(0);
  256                         else    /* Other weird stuff... */
  257                                 ERROUT(0);
  258                         break;
  259                 case NLPID_IP:
  260                         m_adj(m, ptr - start);
  261                         NG_FWD_NEW_DATA(error, item, priv->inet, m);
  262                         break;
  263                 case NLPID_PPP:
  264                         m_adj(m, ptr - start);
  265                         NG_FWD_NEW_DATA(error, item, priv->ppp, m);
  266                         break;
  267                 case NLPID_Q933:
  268                 case NLPID_CLNP:
  269                 case NLPID_ESIS:
  270                 case NLPID_ISIS:
  271                         ERROUT(0);
  272                 default:        /* Try PPP (see RFC 1973) */
  273                         ptr--;  /* NLPID becomes PPP proto */
  274                         if ((*ptr & 0x01) == 0x01)
  275                                 ERROUT(0);
  276                         m_adj(m, ptr - start);
  277                         NG_FWD_NEW_DATA(error, item, priv->ppp, m);
  278                         break;
  279                 }
  280         } else if (hook == priv->ppp) {
  281                 M_PREPEND(m, 2, M_DONTWAIT);    /* Prepend PPP NLPID */
  282                 if (!m)
  283                         ERROUT(ENOBUFS);
  284                 mtod(m, u_char *)[0] = HDLC_UI;
  285                 mtod(m, u_char *)[1] = NLPID_PPP;
  286                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);
  287         } else if (hook == priv->inet) {
  288                 M_PREPEND(m, 2, M_DONTWAIT);    /* Prepend IP NLPID */
  289                 if (!m)
  290                         ERROUT(ENOBUFS);
  291                 mtod(m, u_char *)[0] = HDLC_UI;
  292                 mtod(m, u_char *)[1] = NLPID_IP;
  293                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);
  294         } else
  295                 panic(__func__);
  296 
  297 done:
  298         if (item)
  299                 NG_FREE_ITEM(item);
  300         NG_FREE_M(m);
  301         return (error);
  302 }
  303 
  304 /*
  305  * Nuke node
  306  */
  307 static int
  308 ng_rfc1490_shutdown(node_p node)
  309 {
  310         const priv_p priv = NG_NODE_PRIVATE(node);
  311 
  312         /* Take down netgraph node */
  313         bzero(priv, sizeof(*priv));
  314         FREE(priv, M_NETGRAPH);
  315         NG_NODE_SET_PRIVATE(node, NULL);
  316         NG_NODE_UNREF(node);            /* let the node escape */
  317         return (0);
  318 }
  319 
  320 /*
  321  * Hook disconnection
  322  */
  323 static int
  324 ng_rfc1490_disconnect(hook_p hook)
  325 {
  326         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  327 
  328         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  329         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  330                 ng_rmnode_self(NG_HOOK_NODE(hook));
  331         else if (hook == priv->downlink)
  332                 priv->downlink = NULL;
  333         else if (hook == priv->inet)
  334                 priv->inet = NULL;
  335         else if (hook == priv->ppp)
  336                 priv->ppp = NULL;
  337         else
  338                 panic(__func__);
  339         return (0);
  340 }
  341 

Cache object: 1c20612fe47720e1e836e74e4f02ad73


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