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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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: stable/3/sys/netgraph/ng_rfc1490.c 118183 2003-07-29 20:44:35Z bde $
   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_rmnode;
   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_VERSION,
  100         NG_RFC1490_NODE_TYPE,
  101         NULL,
  102         ng_rfc1490_constructor,
  103         ng_rfc1490_rcvmsg,
  104         ng_rfc1490_rmnode,
  105         ng_rfc1490_newhook,
  106         NULL,
  107         NULL,
  108         ng_rfc1490_rcvdata,
  109         ng_rfc1490_rcvdata,
  110         ng_rfc1490_disconnect,
  111         NULL
  112 };
  113 NETGRAPH_INIT(rfc1490, &typestruct);
  114 
  115 /************************************************************************
  116                         NETGRAPH NODE STUFF
  117  ************************************************************************/
  118 
  119 /*
  120  * Node constructor
  121  */
  122 static int
  123 ng_rfc1490_constructor(node_p *nodep)
  124 {
  125         priv_p priv;
  126         int error;
  127 
  128         /* Allocate private structure */
  129         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
  130         if (priv == NULL)
  131                 return (ENOMEM);
  132         bzero(priv, sizeof(*priv));
  133 
  134         /* Call generic node constructor */
  135         if ((error = ng_make_node_common(&typestruct, nodep))) {
  136                 FREE(priv, M_NETGRAPH);
  137                 return (error);
  138         }
  139         (*nodep)->private = priv;
  140 
  141         /* Done */
  142         return (0);
  143 }
  144 
  145 /*
  146  * Give our ok for a hook to be added
  147  */
  148 static int
  149 ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
  150 {
  151         const priv_p priv = node->private;
  152 
  153         if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
  154                 if (priv->downlink)
  155                         return (EISCONN);
  156                 priv->downlink = hook;
  157         } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
  158                 if (priv->ppp)
  159                         return (EISCONN);
  160                 priv->ppp = hook;
  161         } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
  162                 if (priv->inet)
  163                         return (EISCONN);
  164                 priv->inet = hook;
  165         } else
  166                 return (EINVAL);
  167         return (0);
  168 }
  169 
  170 /*
  171  * Receive a control message. We don't support any special ones.
  172  */
  173 static int
  174 ng_rfc1490_rcvmsg(node_p node, struct ng_mesg *msg,
  175                   const char *raddr, struct ng_mesg **rp)
  176 {
  177         FREE(msg, M_NETGRAPH);
  178         return (EINVAL);
  179 }
  180 
  181 /*
  182  * Receive data on a hook and encapsulate according to RFC 1490.
  183  * Only those nodes marked (*) are supported by this routine so far.
  184  *
  185  *                            Q.922 control
  186  *                                 |
  187  *                                 |
  188  *            --------------------------------------------
  189  *            | 0x03                                     |
  190  *           UI                                       I Frame
  191  *            |                                          |
  192  *      ---------------------------------         --------------
  193  *      | 0x08  | 0x81  |0xCC   |0xCF   | 0x00    |..01....    |..10....
  194  *      |       |       |       |       | 0x80    |            |
  195  *     Q.933   CLNP    IP(*)   PPP(*)  SNAP     ISO 8208    ISO 8208
  196  *      |                    (rfc1973)  |       Modulo 8    Modulo 128
  197  *      |                               |
  198  *      --------------------           OUI
  199  *      |                  |            |
  200  *     L2 ID              L3 ID      -------------------------
  201  *      |               User         |00-80-C2               |00-00-00
  202  *      |               specified    |                       |
  203  *      |               0x70        PID                     Ethertype
  204  *      |                            |                       |
  205  *      -------------------        --------------...        ----------
  206  *      |0x51 |0x4E |     |0x4C    |0x1   |0xB  |           |0x806   |
  207  *      |     |     |     |        |      |     |           |        |
  208  *     7776  Q.922 Others 802.2   802.3  802.6 Others       ARP(*)  Others
  209  *
  210  *
  211  */
  212 
  213 #define MAX_ENCAPS_HDR  8
  214 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  215 #define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
  216 
  217 static int
  218 ng_rfc1490_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  219 {
  220         const node_p node = hook->node;
  221         const priv_p priv = node->private;
  222         int error = 0;
  223 
  224         if (hook == priv->downlink) {
  225                 u_char *start, *ptr;
  226 
  227                 if (!m || (m->m_len < MAX_ENCAPS_HDR
  228                     && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
  229                         ERROUT(ENOBUFS);
  230                 ptr = start = mtod(m, u_char *);
  231 
  232                 /* Must be UI frame */
  233                 if (*ptr++ != HDLC_UI)
  234                         ERROUT(0);
  235 
  236                 /* Eat optional zero pad byte */
  237                 if (*ptr == 0x00)
  238                         ptr++;
  239 
  240                 /* Multiplex on NLPID */
  241                 switch (*ptr++) {
  242                 case NLPID_SNAP:
  243                         if (OUICMP(ptr, 0, 0, 0)) {     /* It's an ethertype */
  244                                 u_int16_t etype;
  245 
  246                                 ptr += 3;
  247                                 etype = ntohs(*((u_int16_t *) ptr));
  248                                 ptr += 2;
  249                                 m_adj(m, ptr - start);
  250                                 switch (etype) {
  251                                 case ETHERTYPE_IP:
  252                                         NG_SEND_DATA(error,
  253                                             priv->inet, m, meta);
  254                                         break;
  255                                 case ETHERTYPE_ARP:
  256                                 case ETHERTYPE_REVARP:
  257                                 default:
  258                                         ERROUT(0);
  259                                 }
  260                         } else if (OUICMP(ptr, 0x00, 0x80, 0xc2))       /* 802.1 bridging */
  261                                 ERROUT(0);
  262                         else    /* Other weird stuff... */
  263                                 ERROUT(0);
  264                         break;
  265                 case NLPID_IP:
  266                         m_adj(m, ptr - start);
  267                         NG_SEND_DATA(error, priv->inet, m, meta);
  268                         break;
  269                 case NLPID_PPP:
  270                         m_adj(m, ptr - start);
  271                         NG_SEND_DATA(error, priv->ppp, m, meta);
  272                         break;
  273                 case NLPID_Q933:
  274                 case NLPID_CLNP:
  275                 case NLPID_ESIS:
  276                 case NLPID_ISIS:
  277                         ERROUT(0);
  278                 default:        /* Try PPP (see RFC 1973) */
  279                         ptr--;  /* NLPID becomes PPP proto */
  280                         if ((*ptr & 0x01) == 0x01)
  281                                 ERROUT(0);
  282                         m_adj(m, ptr - start);
  283                         NG_SEND_DATA(error, priv->ppp, m, meta);
  284                         break;
  285                 }
  286         } else if (hook == priv->ppp) {
  287                 M_PREPEND(m, 2, M_DONTWAIT);    /* Prepend PPP NLPID */
  288                 if (!m)
  289                         ERROUT(ENOBUFS);
  290                 mtod(m, u_char *)[0] = HDLC_UI;
  291                 mtod(m, u_char *)[1] = NLPID_PPP;
  292                 NG_SEND_DATA(error, priv->downlink, m, meta);
  293         } else if (hook == priv->inet) {
  294                 M_PREPEND(m, 2, M_DONTWAIT);    /* Prepend IP NLPID */
  295                 if (!m)
  296                         ERROUT(ENOBUFS);
  297                 mtod(m, u_char *)[0] = HDLC_UI;
  298                 mtod(m, u_char *)[1] = NLPID_IP;
  299                 NG_SEND_DATA(error, priv->downlink, m, meta);
  300         } else
  301                 panic(__FUNCTION__);
  302 
  303 done:
  304         NG_FREE_DATA(m, meta);
  305         return (error);
  306 }
  307 
  308 /*
  309  * Nuke node
  310  */
  311 static int
  312 ng_rfc1490_rmnode(node_p node)
  313 {
  314         const priv_p priv = node->private;
  315 
  316         /* Take down netgraph node */
  317         node->flags |= NG_INVALID;
  318         ng_cutlinks(node);
  319         ng_unname(node);
  320         bzero(priv, sizeof(*priv));
  321         node->private = NULL;
  322         FREE(priv, M_NETGRAPH);
  323         ng_unref(node);         /* let the node escape */
  324         return (0);
  325 }
  326 
  327 /*
  328  * Hook disconnection
  329  */
  330 static int
  331 ng_rfc1490_disconnect(hook_p hook)
  332 {
  333         const priv_p priv = hook->node->private;
  334 
  335         if (hook->node->numhooks == 0)
  336                 ng_rmnode(hook->node);
  337         else if (hook == priv->downlink)
  338                 priv->downlink = NULL;
  339         else if (hook == priv->inet)
  340                 priv->inet = NULL;
  341         else if (hook == priv->ppp)
  342                 priv->ppp = NULL;
  343         else
  344                 panic(__FUNCTION__);
  345         return (0);
  346 }
  347 

Cache object: db0c2bf06b0086a8e81a00352c828721


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