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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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: releng/5.3/sys/netgraph/ng_cisco.c 136588 2004-10-16 08:43:07Z cvs2svn $
   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_shutdown;
  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, item_p item);
  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         .version =      NG_ABI_VERSION,
  175         .name =         NG_CISCO_NODE_TYPE,
  176         .constructor =  cisco_constructor,
  177         .rcvmsg =       cisco_rcvmsg,
  178         .shutdown =     cisco_shutdown,
  179         .newhook =      cisco_newhook,
  180         .rcvdata =      cisco_rcvdata,
  181         .disconnect =   cisco_disconnect,
  182         .cmdlist =      ng_cisco_cmdlist,
  183 };
  184 NETGRAPH_INIT(cisco, &typestruct);
  185 
  186 /*
  187  * Node constructor
  188  */
  189 static int
  190 cisco_constructor(node_p node)
  191 {
  192         sc_p sc;
  193 
  194         MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
  195         if (sc == NULL)
  196                 return (ENOMEM);
  197 
  198         callout_handle_init(&sc->handle);
  199         NG_NODE_SET_PRIVATE(node, sc);
  200         sc->node = node;
  201 
  202         /* Initialise the varous protocol hook holders */
  203         sc->downstream.af = 0xffff;
  204         sc->inet.af = AF_INET;
  205         sc->inet6.af = AF_INET6;
  206         sc->atalk.af = AF_APPLETALK;
  207         sc->ipx.af = AF_IPX;
  208         return (0);
  209 }
  210 
  211 /*
  212  * Check new hook
  213  */
  214 static int
  215 cisco_newhook(node_p node, hook_p hook, const char *name)
  216 {
  217         const sc_p sc = NG_NODE_PRIVATE(node);
  218 
  219         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
  220                 sc->downstream.hook = hook;
  221                 NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
  222 
  223                 /* Start keepalives */
  224                 sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
  225         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
  226                 sc->inet.hook = hook;
  227                 NG_HOOK_SET_PRIVATE(hook, &sc->inet);
  228         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
  229                 sc->atalk.hook = hook;
  230                 NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
  231         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
  232                 sc->ipx.hook = hook;
  233                 NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
  234         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
  235                 NG_HOOK_SET_PRIVATE(hook, NULL);        /* unimplemented */
  236         } else
  237                 return (EINVAL);
  238         return 0;
  239 }
  240 
  241 /*
  242  * Receive control message.
  243  */
  244 static int
  245 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
  246 {
  247         struct ng_mesg *msg;
  248         const sc_p sc = NG_NODE_PRIVATE(node);
  249         struct ng_mesg *resp = NULL;
  250         int error = 0;
  251 
  252         NGI_GET_MSG(item, msg);
  253         switch (msg->header.typecookie) {
  254         case NGM_GENERIC_COOKIE:
  255                 switch (msg->header.cmd) {
  256                 case NGM_TEXT_STATUS:
  257                     {
  258                         char *arg;
  259                         int pos;
  260 
  261                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_mesg)
  262                             + NG_TEXTRESPONSE, M_NOWAIT);
  263                         if (resp == NULL) {
  264                                 error = ENOMEM;
  265                                 break;
  266                         }
  267                         arg = (char *) resp->data;
  268                         pos = sprintf(arg,
  269                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
  270                         pos += sprintf(arg + pos,
  271                           "unacknowledged keepalives: %ld", sc->seqRetries);
  272                         resp->header.arglen = pos + 1;
  273                         break;
  274                     }
  275                 default:
  276                         error = EINVAL;
  277                         break;
  278                 }
  279                 break;
  280         case NGM_CISCO_COOKIE:
  281                 switch (msg->header.cmd) {
  282                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
  283                         if ((msg->header.flags & NGF_RESP) == 0) {
  284                                 struct in_addr *ips;
  285 
  286                                 NG_MKRESPONSE(resp, msg,
  287                                     2 * sizeof(*ips), M_NOWAIT);
  288                                 if (!resp) {
  289                                         error = ENOMEM;
  290                                         break;
  291                                 }
  292                                 ips = (struct in_addr *) resp->data;
  293                                 ips[0] = sc->localip;
  294                                 ips[1] = sc->localmask;
  295                                 break;
  296                         }
  297                         /* FALLTHROUGH */       /* ...if it's a reply */
  298                 case NGM_CISCO_SET_IPADDR:
  299                     {
  300                         struct in_addr *const ips = (struct in_addr *)msg->data;
  301 
  302                         if (msg->header.arglen < 2 * sizeof(*ips)) {
  303                                 error = EINVAL;
  304                                 break;
  305                         }
  306                         sc->localip = ips[0];
  307                         sc->localmask = ips[1];
  308                         break;
  309                     }
  310                 case NGM_CISCO_GET_STATUS:
  311                     {
  312                         struct ng_cisco_stats *stat;
  313 
  314                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
  315                         if (!resp) {
  316                                 error = ENOMEM;
  317                                 break;
  318                         }
  319                         stat = (struct ng_cisco_stats *)resp->data;
  320                         stat->seqRetries = sc->seqRetries;
  321                         stat->keepAlivePeriod = KEEPALIVE_SECS;
  322                         break;
  323                     }
  324                 default:
  325                         error = EINVAL;
  326                         break;
  327                 }
  328                 break;
  329         default:
  330                 error = EINVAL;
  331                 break;
  332         }
  333         NG_RESPOND_MSG(error, node, item, resp);
  334         NG_FREE_MSG(msg);
  335         return (error);
  336 }
  337 
  338 /*
  339  * Receive data
  340  */
  341 static int
  342 cisco_rcvdata(hook_p hook, item_p item)
  343 {
  344         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  345         struct protoent *pep;
  346         struct cisco_header *h;
  347         int error = 0;
  348         struct mbuf *m;
  349 
  350         if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
  351                 goto out;
  352 
  353         /* If it came from our downlink, deal with it separately */
  354         if (pep->af == 0xffff)
  355                 return (cisco_input(sc, item));
  356 
  357         /* OK so it came from a protocol, heading out. Prepend general data
  358            packet header. For now, IP,IPX only  */
  359         m = NGI_M(item); /* still associated with item */
  360         M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
  361         if (!m) {
  362                 error = ENOBUFS;
  363                 goto out;
  364         }
  365         h = mtod(m, struct cisco_header *);
  366         h->address = CISCO_UNICAST;
  367         h->control = 0;
  368 
  369         switch (pep->af) {
  370         case AF_INET:           /* Internet Protocol */
  371                 h->protocol = htons(ETHERTYPE_IP);
  372                 break;
  373         case AF_INET6:
  374                 h->protocol = htons(ETHERTYPE_IPV6);
  375                 break;
  376         case AF_APPLETALK:      /* AppleTalk Protocol */
  377                 h->protocol = htons(ETHERTYPE_AT);
  378                 break;
  379         case AF_IPX:            /* Novell IPX Protocol */
  380                 h->protocol = htons(ETHERTYPE_IPX);
  381                 break;
  382         default:
  383                 error = EAFNOSUPPORT;
  384                 goto out;
  385         }
  386 
  387         /* Send it */
  388         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
  389         return (error);
  390 
  391 out:
  392         NG_FREE_ITEM(item);
  393         return (error);
  394 }
  395 
  396 /*
  397  * Shutdown node
  398  */
  399 static int
  400 cisco_shutdown(node_p node)
  401 {
  402         const sc_p sc = NG_NODE_PRIVATE(node);
  403 
  404         NG_NODE_SET_PRIVATE(node, NULL);
  405         NG_NODE_UNREF(sc->node);
  406         FREE(sc, M_NETGRAPH);
  407         return (0);
  408 }
  409 
  410 /*
  411  * Disconnection of a hook
  412  *
  413  * For this type, removal of the last link destroys the node
  414  */
  415 static int
  416 cisco_disconnect(hook_p hook)
  417 {
  418         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  419         struct protoent *pep;
  420 
  421         /* Check it's not the debug hook */
  422         if ((pep = NG_HOOK_PRIVATE(hook))) {
  423                 pep->hook = NULL;
  424                 if (pep->af == 0xffff) {
  425                         /* If it is the downstream hook, stop the timers */
  426                         untimeout(cisco_keepalive, sc, sc->handle);
  427                 }
  428         }
  429 
  430         /* If no more hooks, remove the node */
  431         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  432         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  433                 ng_rmnode_self(NG_HOOK_NODE(hook));
  434         return (0);
  435 }
  436 
  437 /*
  438  * Receive data
  439  */
  440 static int
  441 cisco_input(sc_p sc, item_p item)
  442 {
  443         const struct cisco_header *h;
  444         struct cisco_header hdrbuf;
  445         struct protoent *pep;
  446         int error = 0;
  447         struct mbuf *m;
  448 
  449         /* Get data */
  450         m = NGI_M(item);
  451 
  452         /* Sanity check header length */
  453         if (m->m_pkthdr.len < sizeof(*h)) {
  454                 error = EINVAL;
  455                 goto drop;
  456         }
  457 
  458         /* Get cisco header */
  459         if (m->m_len >= sizeof(*h))                     /* the common case */
  460                 h = mtod(m, const struct cisco_header *);
  461         else {
  462                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
  463                 h = &hdrbuf;
  464         }
  465         m_adj(m, sizeof(*h));
  466 
  467         /* Check header address */
  468         switch (h->address) {
  469         default:                /* Invalid Cisco packet. */
  470                 goto drop;
  471         case CISCO_UNICAST:
  472         case CISCO_MULTICAST:
  473                 /* Don't check the control field here (RFC 1547). */
  474                 switch (ntohs(h->protocol)) {
  475                 default:
  476                         goto drop;
  477                 case CISCO_KEEPALIVE:
  478                     {
  479                         const struct cisco_packet *p;
  480                         struct cisco_packet pktbuf;
  481 
  482                         /* Sanity check packet length */
  483                         if (m->m_pkthdr.len < sizeof(*p)) {
  484                                 error = EINVAL;
  485                                 goto drop;
  486                         }
  487 
  488                         /* Get cisco packet */
  489                         if (m->m_len >= sizeof(*p))     /* the common case */
  490                                 p = mtod(m, const struct cisco_packet *);
  491                         else {
  492                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
  493                                 p = &pktbuf;
  494                         }
  495 
  496                         /* Check packet type */
  497                         switch (ntohl(p->type)) {
  498                         default:
  499                                 log(LOG_WARNING,
  500                                     "cisco: unknown cisco packet type: 0x%lx\n",
  501                                        (long)ntohl(p->type));
  502                                 break;
  503                         case CISCO_ADDR_REPLY:
  504                                 /* Reply on address request, ignore */
  505                                 break;
  506                         case CISCO_KEEPALIVE_REQ:
  507                                 sc->remote_seq = ntohl(p->par1);
  508                                 if (sc->local_seq == ntohl(p->par2)) {
  509                                         sc->local_seq++;
  510                                         sc->seqRetries = 0;
  511                                 }
  512                                 break;
  513                         case CISCO_ADDR_REQ:
  514                             {
  515                                 struct ng_mesg *msg;
  516                                 int dummy_error = 0;
  517 
  518                                 /* Ask inet peer for IP address information */
  519                                 if (sc->inet.hook == NULL)
  520                                         goto nomsg;
  521                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
  522                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
  523                                 if (msg == NULL)
  524                                         goto nomsg;
  525                                 NG_SEND_MSG_HOOK(dummy_error,
  526                                     sc->node, msg, sc->inet.hook, 0);
  527                 /*
  528                  * XXX Now maybe we should set a flag telling
  529                  * our receiver to send this message when the response comes in
  530                  * instead of now when the data may be bad.
  531                  */
  532                 nomsg:
  533                                 /* Send reply to peer device */
  534                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
  535                                             ntohl(sc->localip.s_addr),
  536                                             ntohl(sc->localmask.s_addr));
  537                                 break;
  538                             }
  539                         }
  540                         goto drop;
  541                     }
  542                 case ETHERTYPE_IP:
  543                         pep = &sc->inet;
  544                         break;
  545                 case ETHERTYPE_IPV6:
  546                         pep = &sc->inet6;
  547                         break;
  548                 case ETHERTYPE_AT:
  549                         pep = &sc->atalk;
  550                         break;
  551                 case ETHERTYPE_IPX:
  552                         pep = &sc->ipx;
  553                         break;
  554                 }
  555                 break;
  556         }
  557 
  558         /* Drop if payload is empty */
  559         if (m->m_pkthdr.len == 0) {
  560                 error = EINVAL;
  561                 goto drop;
  562         }
  563 
  564         /* Send it on */
  565         if (pep->hook == NULL)
  566                 goto drop;
  567         NG_FWD_NEW_DATA(error, item, pep->hook, m);
  568         return (error);
  569 
  570 drop:
  571         NG_FREE_ITEM(item);
  572         return (error);
  573 }
  574 
  575 
  576 /*
  577  * Send keepalive packets, every 10 seconds.
  578  */
  579 static void
  580 cisco_keepalive(void *arg)
  581 {
  582         const sc_p sc = arg;
  583         int s = splimp();
  584 
  585         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
  586         sc->seqRetries++;
  587         splx(s);
  588         sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
  589 }
  590 
  591 /*
  592  * Send Cisco keepalive packet.
  593  */
  594 static int
  595 cisco_send(sc_p sc, int type, long par1, long par2)
  596 {
  597         struct cisco_header *h;
  598         struct cisco_packet *ch;
  599         struct mbuf *m;
  600         u_long  t;
  601         int     error = 0;
  602         struct timeval time;
  603 
  604         getmicrouptime(&time);
  605 
  606         MGETHDR(m, M_DONTWAIT, MT_DATA);
  607         if (!m)
  608                 return (ENOBUFS);
  609 
  610         t = time.tv_sec * 1000 + time.tv_usec / 1000;
  611         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
  612         m->m_pkthdr.rcvif = 0;
  613 
  614         h = mtod(m, struct cisco_header *);
  615         h->address = CISCO_MULTICAST;
  616         h->control = 0;
  617         h->protocol = htons(CISCO_KEEPALIVE);
  618 
  619         ch = (struct cisco_packet *) (h + 1);
  620         ch->type = htonl(type);
  621         ch->par1 = htonl(par1);
  622         ch->par2 = htonl(par2);
  623         ch->rel = -1;
  624         ch->time0 = htons((u_short) (t >> 16));
  625         ch->time1 = htons((u_short) t);
  626 
  627         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
  628         return (error);
  629 }

Cache object: d77c6047380d4f0fa5192fe020029690


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.