The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_gif.c

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    1 /*
    2  * ng_gif.c
    3  */
    4 
    5 /*-
    6  * SPDX-License-Identifier: BSD-3-Clause AND BSD-2-Clause
    7  *
    8  * Copyright 2001 The Aerospace Corporation.  All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  *
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions, and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions, and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The name of The Aerospace Corporation may not be used to endorse or
   20  *    promote products derived from this software.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *
   35  * Copyright (c) 1996-2000 Whistle Communications, Inc.
   36  * All rights reserved.
   37  * 
   38  * Subject to the following obligations and disclaimer of warranty, use and
   39  * redistribution of this software, in source or object code forms, with or
   40  * without modifications are expressly permitted by Whistle Communications;
   41  * provided, however, that:
   42  * 1. Any and all reproductions of the source or object code must include the
   43  *    copyright notice above and the following disclaimer of warranties; and
   44  * 2. No rights are granted, in any manner or form, to use Whistle
   45  *    Communications, Inc. trademarks, including the mark "WHISTLE
   46  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   47  *    such appears in the above copyright notice or in the software.
   48  * 
   49  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   50  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   51  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   52  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   53  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   54  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   55  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   56  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   57  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   58  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   59  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   60  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   61  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   62  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   63  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   64  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   65  * OF SUCH DAMAGE.
   66  *
   67  * $FreeBSD: stable/12/sys/netgraph/ng_gif.c 334123 2018-05-24 00:06:55Z jhb $
   68  */
   69 
   70 /*
   71  * ng_gif(4) netgraph node type
   72  */
   73 #include <sys/param.h>
   74 #include <sys/systm.h>
   75 #include <sys/kernel.h>
   76 #include <sys/malloc.h>
   77 #include <sys/mbuf.h>
   78 #include <sys/errno.h>
   79 #include <sys/syslog.h>
   80 #include <sys/socket.h>
   81 
   82 #include <net/if.h>
   83 #include <net/route.h>
   84 #include <net/if_types.h>
   85 #include <net/if_var.h>
   86 #include <net/if_gif.h>
   87 #include <net/vnet.h>
   88 
   89 #include <netgraph/ng_message.h>
   90 #include <netgraph/netgraph.h>
   91 #include <netgraph/ng_parse.h>
   92 #include <netgraph/ng_gif.h>
   93 
   94 #define IFP2NG(ifp)  ((struct ng_node *)((struct gif_softc *)(ifp->if_softc))->gif_netgraph)
   95 #define IFP2NG_SET(ifp, val)  (((struct gif_softc *)(ifp->if_softc))->gif_netgraph = (val))
   96 
   97 /* Per-node private data */
   98 struct private {
   99         struct ifnet    *ifp;           /* associated interface */
  100         hook_p          lower;          /* lower OR orphan hook connection */
  101         u_char          lowerOrphan;    /* whether lower is lower or orphan */
  102 };
  103 typedef struct private *priv_p;
  104 
  105 /* Functional hooks called from if_gif.c */
  106 static void     ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
  107 static void     ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
  108 static void     ng_gif_attach(struct ifnet *ifp);
  109 static void     ng_gif_detach(struct ifnet *ifp); 
  110 
  111 /* Other functions */
  112 static void     ng_gif_input2(node_p node, struct mbuf **mp, int af);
  113 static int      ng_gif_glue_af(struct mbuf **mp, int af);
  114 static int      ng_gif_rcv_lower(node_p node, struct mbuf *m);
  115 
  116 /* Netgraph node methods */
  117 static ng_constructor_t ng_gif_constructor;
  118 static ng_rcvmsg_t      ng_gif_rcvmsg;
  119 static ng_shutdown_t    ng_gif_shutdown;
  120 static ng_newhook_t     ng_gif_newhook;
  121 static ng_connect_t     ng_gif_connect;
  122 static ng_rcvdata_t     ng_gif_rcvdata;
  123 static ng_disconnect_t  ng_gif_disconnect;
  124 static int              ng_gif_mod_event(module_t mod, int event, void *data);
  125 
  126 /* List of commands and how to convert arguments to/from ASCII */
  127 static const struct ng_cmdlist ng_gif_cmdlist[] = {
  128         {
  129           NGM_GIF_COOKIE,
  130           NGM_GIF_GET_IFNAME,
  131           "getifname",
  132           NULL,
  133           &ng_parse_string_type
  134         },
  135         {
  136           NGM_GIF_COOKIE,
  137           NGM_GIF_GET_IFINDEX,
  138           "getifindex",
  139           NULL,
  140           &ng_parse_int32_type
  141         },
  142         { 0 }
  143 };
  144 
  145 static struct ng_type ng_gif_typestruct = {
  146         .version =      NG_ABI_VERSION,
  147         .name =         NG_GIF_NODE_TYPE,
  148         .mod_event =    ng_gif_mod_event,
  149         .constructor =  ng_gif_constructor,
  150         .rcvmsg =       ng_gif_rcvmsg,
  151         .shutdown =     ng_gif_shutdown,
  152         .newhook =      ng_gif_newhook,
  153         .connect =      ng_gif_connect,
  154         .rcvdata =      ng_gif_rcvdata,
  155         .disconnect =   ng_gif_disconnect,
  156         .cmdlist =      ng_gif_cmdlist,
  157 };
  158 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
  159 NETGRAPH_INIT(gif, &ng_gif_typestruct);
  160 
  161 /******************************************************************
  162                        GIF FUNCTION HOOKS
  163 ******************************************************************/
  164 
  165 /*
  166  * Handle a packet that has come in on an interface. We get to
  167  * look at it here before any upper layer protocols do.
  168  */
  169 static void
  170 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  171 {
  172         const node_p node = IFP2NG(ifp);
  173         const priv_p priv = NG_NODE_PRIVATE(node);
  174 
  175         /* If "lower" hook not connected, let packet continue */
  176         if (priv->lower == NULL || priv->lowerOrphan)
  177                 return;
  178         ng_gif_input2(node, mp, af);
  179 }
  180 
  181 /*
  182  * Handle a packet that has come in on an interface, and which
  183  * does not match any of our known protocols (an ``orphan'').
  184  */
  185 static void
  186 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  187 {
  188         const node_p node = IFP2NG(ifp);
  189         const priv_p priv = NG_NODE_PRIVATE(node);
  190 
  191         /* If "orphan" hook not connected, let packet continue */
  192         if (priv->lower == NULL || !priv->lowerOrphan) {
  193                 m_freem(m);
  194                 return;
  195         }
  196         ng_gif_input2(node, &m, af);
  197         if (m != NULL)
  198                 m_freem(m);
  199 }
  200 
  201 /*
  202  * Handle a packet that has come in on a gif interface.
  203  * Attach the address family to the mbuf for later use.
  204  */
  205 static void
  206 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  207 {
  208         const priv_p priv = NG_NODE_PRIVATE(node);
  209         int error;
  210 
  211         /* Glue address family on */
  212         if ((error = ng_gif_glue_af(mp, af)) != 0)
  213                 return;
  214 
  215         /* Send out lower/orphan hook */
  216         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  217         *mp = NULL;
  218 }
  219 
  220 /*
  221  * A new gif interface has been attached.
  222  * Create a new node for it, etc.
  223  */
  224 static void
  225 ng_gif_attach(struct ifnet *ifp)
  226 {
  227         priv_p priv;
  228         node_p node;
  229 
  230         /* Create node */
  231         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  232         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  233                 log(LOG_ERR, "%s: can't %s for %s\n",
  234                     __func__, "create node", ifp->if_xname);
  235                 return;
  236         }
  237 
  238         /* Allocate private data */
  239         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  240         if (priv == NULL) {
  241                 log(LOG_ERR, "%s: can't %s for %s\n",
  242                     __func__, "allocate memory", ifp->if_xname);
  243                 NG_NODE_UNREF(node);
  244                 return;
  245         }
  246         NG_NODE_SET_PRIVATE(node, priv);
  247         priv->ifp = ifp;
  248         IFP2NG_SET(ifp, node);
  249 
  250         /* Try to give the node the same name as the interface */
  251         if (ng_name_node(node, ifp->if_xname) != 0) {
  252                 log(LOG_WARNING, "%s: can't name node %s\n",
  253                     __func__, ifp->if_xname);
  254         }
  255 }
  256 
  257 /*
  258  * An interface is being detached.
  259  * REALLY Destroy its node.
  260  */
  261 static void
  262 ng_gif_detach(struct ifnet *ifp)
  263 {
  264         const node_p node = IFP2NG(ifp);
  265         priv_p priv;
  266 
  267         if (node == NULL)               /* no node (why not?), ignore */
  268                 return;
  269         priv = NG_NODE_PRIVATE(node);
  270         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  271         /*
  272          * We can't assume the ifnet is still around when we run shutdown
  273          * So zap it now. XXX We HOPE that anything running at this time
  274          * handles it (as it should in the non netgraph case).
  275          */
  276         IFP2NG_SET(ifp, NULL);
  277         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  278         ng_rmnode_self(node);           /* remove all netgraph parts */
  279 }
  280 
  281 /*
  282  * Optimization for gluing the address family onto
  283  * the front of an incoming packet.
  284  */
  285 static int
  286 ng_gif_glue_af(struct mbuf **mp, int af)
  287 {
  288         struct mbuf *m = *mp;
  289         int error = 0;
  290         sa_family_t tmp_af;
  291 
  292         tmp_af = (sa_family_t) af;
  293 
  294         /*
  295          * XXX: should try to bring back some of the optimizations from
  296          * ng_ether.c
  297          */
  298 
  299         /*
  300          * Doing anything more is likely to get more
  301          * expensive than it's worth..
  302          * it's probable that everything else is in one
  303          * big lump. The next node will do an m_pullup()
  304          * for exactly the amount of data it needs and
  305          * hopefully everything after that will not
  306          * need one. So let's just use M_PREPEND.
  307          */
  308         M_PREPEND(m, sizeof (tmp_af), M_NOWAIT);
  309         if (m == NULL) {
  310                 error = ENOBUFS;
  311                 goto done;
  312         }
  313 
  314 #if 0
  315 copy:
  316 #endif
  317         /* Copy header and return (possibly new) mbuf */
  318         *mtod(m, sa_family_t *) = tmp_af;
  319 #if 0
  320         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  321 #endif
  322 done:
  323         *mp = m;
  324         return error;
  325 }
  326 
  327 /******************************************************************
  328                     NETGRAPH NODE METHODS
  329 ******************************************************************/
  330 
  331 /*
  332  * It is not possible or allowable to create a node of this type.
  333  * Nodes get created when the interface is attached (or, when
  334  * this node type's KLD is loaded).
  335  */
  336 static int
  337 ng_gif_constructor(node_p node)
  338 {
  339         return (EINVAL);
  340 }
  341 
  342 /*
  343  * Check for attaching a new hook.
  344  */
  345 static  int
  346 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  347 {
  348         const priv_p priv = NG_NODE_PRIVATE(node);
  349         u_char orphan = priv->lowerOrphan;
  350         hook_p *hookptr;
  351 
  352         /* Divert hook is an alias for lower */
  353         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  354                 name = NG_GIF_HOOK_LOWER;
  355 
  356         /* Which hook? */
  357         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  358                 hookptr = &priv->lower;
  359                 orphan = 0;
  360         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  361                 hookptr = &priv->lower;
  362                 orphan = 1;
  363         } else
  364                 return (EINVAL);
  365 
  366         /* Check if already connected (shouldn't be, but doesn't hurt) */
  367         if (*hookptr != NULL)
  368                 return (EISCONN);
  369 
  370         /* OK */
  371         *hookptr = hook;
  372         priv->lowerOrphan = orphan;
  373         return (0);
  374 }
  375 
  376 /*
  377  * Hooks are attached, adjust to force queueing.
  378  * We don't really care which hook it is.
  379  * they should all be queuing for outgoing data.
  380  */
  381 static  int
  382 ng_gif_connect(hook_p hook)
  383 {
  384         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  385         return (0);
  386 }
  387 
  388 /*
  389  * Receive an incoming control message.
  390  */
  391 static int
  392 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  393 {
  394         const priv_p priv = NG_NODE_PRIVATE(node);
  395         struct ng_mesg *resp = NULL;
  396         int error = 0;
  397         struct ng_mesg *msg;
  398 
  399         NGI_GET_MSG(item, msg);
  400         switch (msg->header.typecookie) {
  401         case NGM_GIF_COOKIE:
  402                 switch (msg->header.cmd) {
  403                 case NGM_GIF_GET_IFNAME:
  404                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  405                         if (resp == NULL) {
  406                                 error = ENOMEM;
  407                                 break;
  408                         }
  409                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
  410                         break;
  411                 case NGM_GIF_GET_IFINDEX:
  412                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  413                         if (resp == NULL) {
  414                                 error = ENOMEM;
  415                                 break;
  416                         }
  417                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  418                         break;
  419                 default:
  420                         error = EINVAL;
  421                         break;
  422                 }
  423                 break;
  424         default:
  425                 error = EINVAL;
  426                 break;
  427         }
  428         NG_RESPOND_MSG(error, node, item, resp);
  429         NG_FREE_MSG(msg);
  430         return (error);
  431 }
  432 
  433 /*
  434  * Receive data on a hook.
  435  */
  436 static int
  437 ng_gif_rcvdata(hook_p hook, item_p item)
  438 {
  439         const node_p node = NG_HOOK_NODE(hook);
  440         const priv_p priv = NG_NODE_PRIVATE(node);
  441         struct mbuf *m;
  442 
  443         NGI_GET_M(item, m);
  444         NG_FREE_ITEM(item);
  445 
  446         if (hook == priv->lower)
  447                 return ng_gif_rcv_lower(node, m);
  448         panic("%s: weird hook", __func__);
  449 }
  450 
  451 /*
  452  * Handle an mbuf received on the "lower" hook.
  453  */
  454 static int
  455 ng_gif_rcv_lower(node_p node, struct mbuf *m)
  456 {
  457         struct sockaddr dst;
  458         const priv_p priv = NG_NODE_PRIVATE(node);
  459 
  460         bzero(&dst, sizeof(dst));
  461 
  462         /* Make sure header is fully pulled up */
  463         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  464                 NG_FREE_M(m);
  465                 return (EINVAL);
  466         }
  467         if (m->m_len < sizeof(sa_family_t)
  468             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  469                 return (ENOBUFS);
  470         }
  471 
  472         dst.sa_family = *mtod(m, sa_family_t *);
  473         m_adj(m, sizeof(sa_family_t));
  474 
  475         /* Send it on its way */
  476         /*
  477          * XXX: gif_output only uses dst for the family and passes the
  478          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  479          * If this changes ng_gif will probably break.
  480          */
  481         return gif_output(priv->ifp, m, &dst, NULL);
  482 }
  483 
  484 /*
  485  * Shutdown node. This resets the node but does not remove it
  486  * unless the REALLY_DIE flag is set.
  487  */
  488 static int
  489 ng_gif_shutdown(node_p node)
  490 {
  491         const priv_p priv = NG_NODE_PRIVATE(node);
  492 
  493         if (node->nd_flags & NGF_REALLY_DIE) {
  494                 /*
  495                  * WE came here because the gif interface is being destroyed,
  496                  * so stop being persistent.
  497                  * Actually undo all the things we did on creation.
  498                  * Assume the ifp has already been freed.
  499                  */
  500                 NG_NODE_SET_PRIVATE(node, NULL);
  501                 free(priv, M_NETGRAPH);         
  502                 NG_NODE_UNREF(node);    /* free node itself */
  503                 return (0);
  504         }
  505         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  506         return (0);
  507 }
  508 
  509 /*
  510  * Hook disconnection.
  511  */
  512 static int
  513 ng_gif_disconnect(hook_p hook)
  514 {
  515         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  516 
  517         if (hook == priv->lower) {
  518                 priv->lower = NULL;
  519                 priv->lowerOrphan = 0;
  520         } else 
  521                 panic("%s: weird hook", __func__);
  522         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  523             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  524                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  525 
  526         return (0);
  527 }
  528 
  529 /******************************************************************
  530                         INITIALIZATION
  531 ******************************************************************/
  532 
  533 /*
  534  * Handle loading and unloading for this node type.
  535  */
  536 static int
  537 ng_gif_mod_event(module_t mod, int event, void *data)
  538 {
  539         VNET_ITERATOR_DECL(vnet_iter);
  540         struct ifnet *ifp;
  541         int error = 0;
  542 
  543         switch (event) {
  544         case MOD_LOAD:
  545 
  546                 /* Register function hooks */
  547                 if (ng_gif_attach_p != NULL) {
  548                         error = EEXIST;
  549                         break;
  550                 }
  551                 ng_gif_attach_p = ng_gif_attach;
  552                 ng_gif_detach_p = ng_gif_detach;
  553                 ng_gif_input_p = ng_gif_input;
  554                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  555 
  556                 /* Create nodes for any already-existing gif interfaces */
  557                 VNET_LIST_RLOCK();
  558                 IFNET_RLOCK();
  559                 VNET_FOREACH(vnet_iter) {
  560                         CURVNET_SET_QUIET(vnet_iter); /* XXX revisit quiet */
  561                         CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  562                                 if (ifp->if_type == IFT_GIF)
  563                                         ng_gif_attach(ifp);
  564                         }
  565                         CURVNET_RESTORE();
  566                 }
  567                 IFNET_RUNLOCK();
  568                 VNET_LIST_RUNLOCK();
  569                 break;
  570 
  571         case MOD_UNLOAD:
  572 
  573                 /*
  574                  * Note that the base code won't try to unload us until
  575                  * all nodes have been removed, and that can't happen
  576                  * until all gif interfaces are destroyed. In any
  577                  * case, we know there are no nodes left if the action
  578                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  579                  *
  580                  * XXX: what about manual unloads?!?
  581                  */
  582 
  583                 /* Unregister function hooks */
  584                 ng_gif_attach_p = NULL;
  585                 ng_gif_detach_p = NULL;
  586                 ng_gif_input_p = NULL;
  587                 ng_gif_input_orphan_p = NULL;
  588                 break;
  589 
  590         default:
  591                 error = EOPNOTSUPP;
  592                 break;
  593         }
  594         return (error);
  595 }
  596 

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