ng_cisco.c

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    1 
    2 /*
    3  * ng_cisco.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  * $FreeBSD$
   40  * $Whistle: ng_cisco.c,v 1.25 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/errno.h>
   46 #include <sys/kernel.h>
   47 #include <sys/socket.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/syslog.h>
   51 
   52 #include <net/if.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet/if_ether.h>
   56 
   57 #include <netatalk/at.h>
   58 
   59 #include <netipx/ipx.h>
   60 #include <netipx/ipx_if.h>
   61 
   62 #include <netgraph/ng_message.h>
   63 #include <netgraph/netgraph.h>
   64 #include <netgraph/ng_parse.h>
   65 #include <netgraph/ng_cisco.h>
   66 
   67 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
   68 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
   69 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
   70 #define CISCO_ADDR_REQ          0       /* Cisco address request */
   71 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
   72 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
   73 
   74 #define KEEPALIVE_SECS          10
   75 
   76 struct cisco_header {
   77         u_char  address;
   78         u_char  control;
   79         u_short protocol;
   80 };
   81 
   82 #define CISCO_HEADER_LEN          sizeof (struct cisco_header)
   83 
   84 struct cisco_packet {
   85         u_long  type;
   86         u_long  par1;
   87         u_long  par2;
   88         u_short rel;
   89         u_short time0;
   90         u_short time1;
   91 };
   92 
   93 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
   94 
   95 struct protoent {
   96         hook_p  hook;           /* the hook for this proto */
   97         u_short af;             /* address family, -1 = downstream */
   98 };
   99 
  100 struct cisco_priv {
  101         u_long  local_seq;
  102         u_long  remote_seq;
  103         u_long  seqRetries;     /* how many times we've been here throwing out
  104                                  * the same sequence number without ack */
  105         node_p  node;
  106         struct callout_handle handle;
  107         struct protoent downstream;
  108         struct protoent inet;           /* IP information */
  109         struct in_addr localip;
  110         struct in_addr localmask;
  111         struct protoent inet6;          /* IPv6 information */
  112         struct protoent atalk;          /* AppleTalk information */
  113         struct protoent ipx;            /* IPX information */
  114 };
  115 typedef struct cisco_priv *sc_p;
  116 
  117 /* Netgraph methods */
  118 static ng_constructor_t         cisco_constructor;
  119 static ng_rcvmsg_t              cisco_rcvmsg;
  120 static ng_shutdown_t            cisco_rmnode;
  121 static ng_newhook_t             cisco_newhook;
  122 static ng_rcvdata_t             cisco_rcvdata;
  123 static ng_disconnect_t          cisco_disconnect;
  124 
  125 /* Other functions */
  126 static int      cisco_input(sc_p sc, struct mbuf *m, meta_p meta);
  127 static void     cisco_keepalive(void *arg);
  128 static int      cisco_send(sc_p sc, int type, long par1, long par2);
  129 
  130 /* Parse type for struct ng_cisco_ipaddr */
  131 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
  132         = NG_CISCO_IPADDR_TYPE_INFO;
  133 static const struct ng_parse_type ng_cisco_ipaddr_type = {
  134         &ng_parse_struct_type,
  135         &ng_cisco_ipaddr_type_fields
  136 };
  137 
  138 /* Parse type for struct ng_async_stat */
  139 static const struct ng_parse_struct_field ng_cisco_stats_type_fields[]
  140         = NG_CISCO_STATS_TYPE_INFO;
  141 static const struct ng_parse_type ng_cisco_stats_type = {
  142         &ng_parse_struct_type,
  143         &ng_cisco_stats_type_fields
  144 };
  145 
  146 /* List of commands and how to convert arguments to/from ASCII */
  147 static const struct ng_cmdlist ng_cisco_cmdlist[] = {
  148         {
  149           NGM_CISCO_COOKIE,
  150           NGM_CISCO_SET_IPADDR,
  151           "setipaddr",
  152           &ng_cisco_ipaddr_type,
  153           NULL
  154         },
  155         {
  156           NGM_CISCO_COOKIE,
  157           NGM_CISCO_GET_IPADDR,
  158           "getipaddr",
  159           NULL,
  160           &ng_cisco_ipaddr_type
  161         },
  162         {
  163           NGM_CISCO_COOKIE,
  164           NGM_CISCO_GET_STATUS,
  165           "getstats",
  166           NULL,
  167           &ng_cisco_stats_type
  168         },
  169         { 0 }
  170 };
  171 
  172 /* Node type */
  173 static struct ng_type typestruct = {
  174         NG_VERSION,
  175         NG_CISCO_NODE_TYPE,
  176         NULL,
  177         cisco_constructor,
  178         cisco_rcvmsg,
  179         cisco_rmnode,
  180         cisco_newhook,
  181         NULL,
  182         NULL,
  183         cisco_rcvdata,
  184         cisco_rcvdata,
  185         cisco_disconnect,
  186         ng_cisco_cmdlist
  187 };
  188 NETGRAPH_INIT(cisco, &typestruct);
  189 
  190 /*
  191  * Node constructor
  192  */
  193 static int
  194 cisco_constructor(node_p *nodep)
  195 {
  196         sc_p sc;
  197         int error = 0;
  198 
  199         MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT);
  200         if (sc == NULL)
  201                 return (ENOMEM);
  202         bzero(sc, sizeof(struct cisco_priv));
  203 
  204         callout_handle_init(&sc->handle);
  205         if ((error = ng_make_node_common(&typestruct, nodep))) {
  206                 FREE(sc, M_NETGRAPH);
  207                 return (error);
  208         }
  209         (*nodep)->private = sc;
  210         sc->node = *nodep;
  211 
  212         /* Initialise the varous protocol hook holders */
  213         sc->downstream.af = 0xffff;
  214         sc->inet.af = AF_INET;
  215         sc->inet6.af = AF_INET6;
  216         sc->atalk.af = AF_APPLETALK;
  217         sc->ipx.af = AF_IPX;
  218         return (0);
  219 }
  220 
  221 /*
  222  * Check new hook
  223  */
  224 static int
  225 cisco_newhook(node_p node, hook_p hook, const char *name)
  226 {
  227         const sc_p sc = node->private;
  228 
  229         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
  230                 sc->downstream.hook = hook;
  231                 hook->private = &sc->downstream;
  232 
  233                 /* Start keepalives */
  234                 sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
  235         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
  236                 sc->inet.hook = hook;
  237                 hook->private = &sc->inet;
  238         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
  239                 sc->atalk.hook = hook;
  240                 hook->private = &sc->atalk;
  241         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
  242                 sc->ipx.hook = hook;
  243                 hook->private = &sc->ipx;
  244         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
  245                 hook->private = NULL;   /* unimplemented */
  246         } else
  247                 return (EINVAL);
  248         return 0;
  249 }
  250 
  251 /*
  252  * Receive control message.
  253  */
  254 static int
  255 cisco_rcvmsg(node_p node, struct ng_mesg *msg,
  256         const char *retaddr, struct ng_mesg **rptr)
  257 {
  258         const sc_p sc = node->private;
  259         struct ng_mesg *resp = NULL;
  260         int error = 0;
  261 
  262         switch (msg->header.typecookie) {
  263         case NGM_GENERIC_COOKIE:
  264                 switch (msg->header.cmd) {
  265                 case NGM_TEXT_STATUS:
  266                     {
  267                         char *arg;
  268                         int pos;
  269 
  270                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_mesg)
  271                             + NG_TEXTRESPONSE, M_NOWAIT);
  272                         if (resp == NULL) {
  273                                 error = ENOMEM;
  274                                 break;
  275                         }
  276                         arg = (char *) resp->data;
  277                         pos = sprintf(arg,
  278                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
  279                         pos += sprintf(arg + pos,
  280                           "unacknowledged keepalives: %ld", sc->seqRetries);
  281                         resp->header.arglen = pos + 1;
  282                         break;
  283                     }
  284                 default:
  285                         error = EINVAL;
  286                         break;
  287                 }
  288                 break;
  289         case NGM_CISCO_COOKIE:
  290                 switch (msg->header.cmd) {
  291                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
  292                         if ((msg->header.flags & NGF_RESP) == 0) {
  293                                 struct in_addr *ips;
  294 
  295                                 NG_MKRESPONSE(resp, msg,
  296                                     2 * sizeof(*ips), M_NOWAIT);
  297                                 if (!resp) {
  298                                         error = ENOMEM;
  299                                         break;
  300                                 }
  301                                 ips = (struct in_addr *) resp->data;
  302                                 ips[0] = sc->localip;
  303                                 ips[1] = sc->localmask;
  304                                 break;
  305                         }
  306                         /* FALLTHROUGH */       /* ...if it's a reply */
  307                 case NGM_CISCO_SET_IPADDR:
  308                     {
  309                         struct in_addr *const ips = (struct in_addr *)msg->data;
  310 
  311                         if (msg->header.arglen < 2 * sizeof(*ips)) {
  312                                 error = EINVAL;
  313                                 break;
  314                         }
  315                         sc->localip = ips[0];
  316                         sc->localmask = ips[1];
  317                         break;
  318                     }
  319                 case NGM_CISCO_GET_STATUS:
  320                     {
  321                         struct ng_cisco_stats *stat;
  322 
  323                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
  324                         if (!resp) {
  325                                 error = ENOMEM;
  326                                 break;
  327                         }
  328                         stat = (struct ng_cisco_stats *)resp->data;
  329                         stat->seqRetries = sc->seqRetries;
  330                         stat->keepAlivePeriod = KEEPALIVE_SECS;
  331                         break;
  332                     }
  333                 default:
  334                         error = EINVAL;
  335                         break;
  336                 }
  337                 break;
  338         default:
  339                 error = EINVAL;
  340                 break;
  341         }
  342         if (rptr)
  343                 *rptr = resp;
  344         else if (resp)
  345                 FREE(resp, M_NETGRAPH);
  346         FREE(msg, M_NETGRAPH);
  347         return (error);
  348 }
  349 
  350 /*
  351  * Receive data
  352  */
  353 static int
  354 cisco_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  355 {
  356         const sc_p sc = hook->node->private;
  357         struct protoent *pep;
  358         struct cisco_header *h;
  359         int error = 0;
  360 
  361         if ((pep = hook->private) == NULL)
  362                 goto out;
  363 
  364         /* If it came from our downlink, deal with it separately */
  365         if (pep->af == 0xffff)
  366                 return (cisco_input(sc, m, meta));
  367 
  368         /* OK so it came from a protocol, heading out. Prepend general data
  369            packet header. For now, IP,IPX only  */
  370         M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
  371         if (!m) {
  372                 error = ENOBUFS;
  373                 goto out;
  374         }
  375         h = mtod(m, struct cisco_header *);
  376         h->address = CISCO_UNICAST;
  377         h->control = 0;
  378 
  379         switch (pep->af) {
  380         case AF_INET:           /* Internet Protocol */
  381                 h->protocol = htons(ETHERTYPE_IP);
  382                 break;
  383         case AF_INET6:
  384                 h->protocol = htons(ETHERTYPE_IPV6);
  385                 break;
  386         case AF_APPLETALK:      /* AppleTalk Protocol */
  387                 h->protocol = htons(ETHERTYPE_AT);
  388                 break;
  389         case AF_IPX:            /* Novell IPX Protocol */
  390                 h->protocol = htons(ETHERTYPE_IPX);
  391                 break;
  392         default:
  393                 error = EAFNOSUPPORT;
  394                 goto out;
  395         }
  396 
  397         /* Send it */
  398         NG_SEND_DATA(error, sc->downstream.hook, m, meta);
  399         return (error);
  400 
  401 out:
  402         NG_FREE_DATA(m, meta);
  403         return (error);
  404 }
  405 
  406 /*
  407  * Shutdown node
  408  */
  409 static int
  410 cisco_rmnode(node_p node)
  411 {
  412         const sc_p sc = node->private;
  413 
  414         node->flags |= NG_INVALID;
  415         ng_cutlinks(node);
  416         ng_unname(node);
  417         node->private = NULL;
  418         ng_unref(sc->node);
  419         FREE(sc, M_NETGRAPH);
  420         return (0);
  421 }
  422 
  423 /*
  424  * Disconnection of a hook
  425  *
  426  * For this type, removal of the last link destroys the node
  427  */
  428 static int
  429 cisco_disconnect(hook_p hook)
  430 {
  431         const sc_p sc = hook->node->private;
  432         struct protoent *pep;
  433 
  434         /* Check it's not the debug hook */
  435         if ((pep = hook->private)) {
  436                 pep->hook = NULL;
  437                 if (pep->af == 0xffff) {
  438                         /* If it is the downstream hook, stop the timers */
  439                         untimeout(cisco_keepalive, sc, sc->handle);
  440                 }
  441         }
  442 
  443         /* If no more hooks, remove the node */
  444         if (hook->node->numhooks == 0)
  445                 ng_rmnode(hook->node);
  446         return (0);
  447 }
  448 
  449 /*
  450  * Receive data
  451  */
  452 static int
  453 cisco_input(sc_p sc, struct mbuf *m, meta_p meta)
  454 {
  455         const struct cisco_header *h;
  456         struct cisco_header hdrbuf;
  457         struct protoent *pep;
  458         int error = 0;
  459 
  460         /* Sanity check header length */
  461         if (m->m_pkthdr.len < sizeof(*h)) {
  462                 error = EINVAL;
  463                 goto drop;
  464         }
  465 
  466         /* Get cisco header */
  467         if (m->m_len >= sizeof(*h))                     /* the common case */
  468                 h = mtod(m, const struct cisco_header *);
  469         else {
  470                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
  471                 h = &hdrbuf;
  472         }
  473         m_adj(m, sizeof(*h));
  474 
  475         /* Check header address */
  476         switch (h->address) {
  477         default:                /* Invalid Cisco packet. */
  478                 goto drop;
  479         case CISCO_UNICAST:
  480         case CISCO_MULTICAST:
  481                 /* Don't check the control field here (RFC 1547). */
  482                 switch (ntohs(h->protocol)) {
  483                 default:
  484                         goto drop;
  485                 case CISCO_KEEPALIVE:
  486                     {
  487                         const struct cisco_packet *p;
  488                         struct cisco_packet pktbuf;
  489 
  490                         /* Sanity check packet length */
  491                         if (m->m_pkthdr.len < sizeof(*p)) {
  492                                 error = EINVAL;
  493                                 goto drop;
  494                         }
  495 
  496                         /* Get cisco packet */
  497                         if (m->m_len >= sizeof(*p))     /* the common case */
  498                                 p = mtod(m, const struct cisco_packet *);
  499                         else {
  500                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
  501                                 p = &pktbuf;
  502                         }
  503 
  504                         /* Check packet type */
  505                         switch (ntohl(p->type)) {
  506                         default:
  507                                 log(LOG_WARNING,
  508                                     "cisco: unknown cisco packet type: 0x%lx\n",
  509                                        ntohl(p->type));
  510                                 break;
  511                         case CISCO_ADDR_REPLY:
  512                                 /* Reply on address request, ignore */
  513                                 break;
  514                         case CISCO_KEEPALIVE_REQ:
  515                                 sc->remote_seq = ntohl(p->par1);
  516                                 if (sc->local_seq == ntohl(p->par2)) {
  517                                         sc->local_seq++;
  518                                         sc->seqRetries = 0;
  519                                 }
  520                                 break;
  521                         case CISCO_ADDR_REQ:
  522                             {
  523                                 struct ng_mesg *msg, *resp;
  524 
  525                                 /* Ask inet peer for IP address information */
  526                                 if (sc->inet.hook == NULL)
  527                                         goto nomsg;
  528                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
  529                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
  530                                 if (msg == NULL)
  531                                         goto nomsg;
  532                                 ng_send_msg(sc->node, msg,
  533                                     NG_CISCO_HOOK_INET, &resp);
  534                                 if (resp != NULL)
  535                                         cisco_rcvmsg(sc->node, resp, ".", NULL);
  536 
  537                 nomsg:
  538                                 /* Send reply to peer device */
  539                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
  540                                             ntohl(sc->localip.s_addr),
  541                                             ntohl(sc->localmask.s_addr));
  542                                 break;
  543                             }
  544                         }
  545                         goto drop;
  546                     }
  547                 case ETHERTYPE_IP:
  548                         pep = &sc->inet;
  549                         break;
  550                 case ETHERTYPE_IPV6:
  551                         pep = &sc->inet6;
  552                         break;
  553                 case ETHERTYPE_AT:
  554                         pep = &sc->atalk;
  555                         break;
  556                 case ETHERTYPE_IPX:
  557                         pep = &sc->ipx;
  558                         break;
  559                 }
  560                 break;
  561         }
  562 
  563         /* Drop if payload is empty */
  564         if (m->m_pkthdr.len == 0) {
  565                 error = EINVAL;
  566                 goto drop;
  567         }
  568 
  569         /* Send it on */
  570         if (pep->hook == NULL)
  571                 goto drop;
  572         NG_SEND_DATA(error, pep->hook, m, meta);
  573         return (error);
  574 
  575 drop:
  576         NG_FREE_DATA(m, meta);
  577         return (error);
  578 }
  579 
  580 
  581 /*
  582  * Send keepalive packets, every 10 seconds.
  583  */
  584 static void
  585 cisco_keepalive(void *arg)
  586 {
  587         const sc_p sc = arg;
  588         int s = splimp();
  589 
  590         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
  591         sc->seqRetries++;
  592         splx(s);
  593         sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
  594 }
  595 
  596 /*
  597  * Send Cisco keepalive packet.
  598  */
  599 static int
  600 cisco_send(sc_p sc, int type, long par1, long par2)
  601 {
  602         struct cisco_header *h;
  603         struct cisco_packet *ch;
  604         struct mbuf *m;
  605         u_long  t;
  606         int     error = 0;
  607         meta_p  meta = NULL;
  608         struct timeval time;
  609 
  610         getmicrotime(&time);
  611 
  612         MGETHDR(m, M_DONTWAIT, MT_DATA);
  613         if (!m)
  614                 return (ENOBUFS);
  615 
  616         t = (time.tv_sec - boottime.tv_sec) * 1000;
  617         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
  618         m->m_pkthdr.rcvif = 0;
  619 
  620         h = mtod(m, struct cisco_header *);
  621         h->address = CISCO_MULTICAST;
  622         h->control = 0;
  623         h->protocol = htons(CISCO_KEEPALIVE);
  624 
  625         ch = (struct cisco_packet *) (h + 1);
  626         ch->type = htonl(type);
  627         ch->par1 = htonl(par1);
  628         ch->par2 = htonl(par2);
  629         ch->rel = -1;
  630         ch->time0 = htons((u_short) (t >> 16));
  631         ch->time1 = htons((u_short) t);
  632 
  633         NG_SEND_DATA(error, sc->downstream.hook, m, meta);
  634         return (error);
  635 }
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This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/netgraph/ng_cisco.c

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