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

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    1 /*-
    2  *
    3  * Copyright (c) 1999-2001, Vitaly V Belekhov
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice unmodified, this list of conditions, and the following
   11  *    disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/7.4/sys/netgraph/ng_eiface.c 215368 2010-11-16 04:40:03Z sobomax $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/errno.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mbuf.h>
   37 #include <sys/errno.h>
   38 #include <sys/sockio.h>
   39 #include <sys/socket.h>
   40 #include <sys/syslog.h>
   41 
   42 #include <net/if.h>
   43 #include <net/if_types.h>
   44 #include <net/netisr.h>
   45 
   46 #include <netgraph/ng_message.h>
   47 #include <netgraph/netgraph.h>
   48 #include <netgraph/ng_parse.h>
   49 #include <netgraph/ng_eiface.h>
   50 
   51 #include <net/bpf.h>
   52 #include <net/ethernet.h>
   53 #include <net/if_arp.h>
   54 
   55 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   56         {
   57           NGM_EIFACE_COOKIE,
   58           NGM_EIFACE_GET_IFNAME,
   59           "getifname",
   60           NULL,
   61           &ng_parse_string_type
   62         },
   63         {
   64           NGM_EIFACE_COOKIE,
   65           NGM_EIFACE_SET,
   66           "set",
   67           &ng_parse_enaddr_type,
   68           NULL
   69         },
   70         { 0 }
   71 };
   72 
   73 /* Node private data */
   74 struct ng_eiface_private {
   75         struct ifnet    *ifp;           /* per-interface network data */
   76         int             unit;           /* Interface unit number */
   77         node_p          node;           /* Our netgraph node */
   78         hook_p          ether;          /* Hook for ethernet stream */
   79 };
   80 typedef struct ng_eiface_private *priv_p;
   81 
   82 /* Interface methods */
   83 static void     ng_eiface_init(void *xsc);
   84 static void     ng_eiface_start(struct ifnet *ifp);
   85 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   86 #ifdef DEBUG
   87 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
   88 #endif
   89 
   90 /* Netgraph methods */
   91 static int              ng_eiface_mod_event(module_t, int, void *);
   92 static ng_constructor_t ng_eiface_constructor;
   93 static ng_rcvmsg_t      ng_eiface_rcvmsg;
   94 static ng_shutdown_t    ng_eiface_rmnode;
   95 static ng_newhook_t     ng_eiface_newhook;
   96 static ng_rcvdata_t     ng_eiface_rcvdata;
   97 static ng_disconnect_t  ng_eiface_disconnect;
   98 
   99 /* Node type descriptor */
  100 static struct ng_type typestruct = {
  101         .version =      NG_ABI_VERSION,
  102         .name =         NG_EIFACE_NODE_TYPE,
  103         .mod_event =    ng_eiface_mod_event,
  104         .constructor =  ng_eiface_constructor,
  105         .rcvmsg =       ng_eiface_rcvmsg,
  106         .shutdown =     ng_eiface_rmnode,
  107         .newhook =      ng_eiface_newhook,
  108         .rcvdata =      ng_eiface_rcvdata,
  109         .disconnect =   ng_eiface_disconnect,
  110         .cmdlist =      ng_eiface_cmdlist
  111 };
  112 NETGRAPH_INIT(eiface, &typestruct);
  113 
  114 static struct unrhdr    *ng_eiface_unit;
  115 
  116 /************************************************************************
  117                         INTERFACE STUFF
  118  ************************************************************************/
  119 
  120 /*
  121  * Process an ioctl for the virtual interface
  122  */
  123 static int
  124 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  125 {
  126         struct ifreq *const ifr = (struct ifreq *)data;
  127         int s, error = 0;
  128 
  129 #ifdef DEBUG
  130         ng_eiface_print_ioctl(ifp, command, data);
  131 #endif
  132         s = splimp();
  133         switch (command) {
  134 
  135         /* These two are mostly handled at a higher layer */
  136         case SIOCSIFADDR:
  137                 error = ether_ioctl(ifp, command, data);
  138                 break;
  139         case SIOCGIFADDR:
  140                 break;
  141 
  142         /* Set flags */
  143         case SIOCSIFFLAGS:
  144                 /*
  145                  * If the interface is marked up and stopped, then start it.
  146                  * If it is marked down and running, then stop it.
  147                  */
  148                 if (ifp->if_flags & IFF_UP) {
  149                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  150                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  151                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  152                         }
  153                 } else {
  154                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  155                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  156                                     IFF_DRV_OACTIVE);
  157                 }
  158                 break;
  159 
  160         /* Set the interface MTU */
  161         case SIOCSIFMTU:
  162                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  163                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  164                         error = EINVAL;
  165                 else
  166                         ifp->if_mtu = ifr->ifr_mtu;
  167                 break;
  168 
  169         /* Stuff that's not supported */
  170         case SIOCADDMULTI:
  171         case SIOCDELMULTI:
  172                 error = 0;
  173                 break;
  174         case SIOCSIFPHYS:
  175                 error = EOPNOTSUPP;
  176                 break;
  177 
  178         default:
  179                 error = EINVAL;
  180                 break;
  181         }
  182         splx(s);
  183         return (error);
  184 }
  185 
  186 static void
  187 ng_eiface_init(void *xsc)
  188 {
  189         priv_p sc = xsc;
  190         struct ifnet *ifp = sc->ifp;
  191         int s;
  192 
  193         s = splimp();
  194 
  195         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  196         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  197 
  198         splx(s);
  199 }
  200 
  201 /*
  202  * We simply relay the packet to the "ether" hook, if it is connected.
  203  * We have been through the netgraph locking and are guaranteed to
  204  * be the only code running in this node at this time.
  205  */
  206 static void
  207 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  208 {
  209         struct ifnet *ifp = arg1;
  210         const priv_p priv = (priv_p)ifp->if_softc;
  211         int error = 0;
  212         struct mbuf *m;
  213 
  214         /* Check interface flags */
  215 
  216         if (!((ifp->if_flags & IFF_UP) &&
  217             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  218                 return;
  219 
  220         for (;;) {
  221                 /*
  222                  * Grab a packet to transmit.
  223                  */
  224                 IF_DEQUEUE(&ifp->if_snd, m);
  225 
  226                 /* If there's nothing to send, break. */
  227                 if (m == NULL)
  228                         break;
  229 
  230                 /*
  231                  * Berkeley packet filter.
  232                  * Pass packet to bpf if there is a listener.
  233                  * XXX is this safe? locking?
  234                  */
  235                 BPF_MTAP(ifp, m);
  236 
  237                 if (ifp->if_flags & IFF_MONITOR) {
  238                         ifp->if_ipackets++;
  239                         m_freem(m);
  240                         continue;
  241                 }
  242 
  243                 /*
  244                  * Send packet; if hook is not connected, mbuf will get
  245                  * freed.
  246                  */
  247                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  248 
  249                 /* Update stats */
  250                 if (error == 0)
  251                         ifp->if_opackets++;
  252                 else
  253                         ifp->if_oerrors++;
  254         }
  255 
  256         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  257 
  258         return;
  259 }
  260 
  261 /*
  262  * This routine is called to deliver a packet out the interface.
  263  * We simply queue the netgraph version to be called when netgraph locking
  264  * allows it to happen.
  265  * Until we know what the rest of the networking code is doing for
  266  * locking, we don't know how we will interact with it.
  267  * Take comfort from the fact that the ifnet struct is part of our
  268  * private info and can't go away while we are queued.
  269  * [Though we don't know it is still there now....]
  270  * it is possible we don't gain anything from this because
  271  * we would like to get the mbuf and queue it as data
  272  * somehow, but we can't and if we did would we solve anything?
  273  */
  274 static void
  275 ng_eiface_start(struct ifnet *ifp)
  276 {
  277 
  278         const priv_p priv = (priv_p)ifp->if_softc;
  279 
  280         /* Don't do anything if output is active */
  281         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  282                 return;
  283 
  284         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  285 
  286         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  287                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  288 }
  289 
  290 #ifdef DEBUG
  291 /*
  292  * Display an ioctl to the virtual interface
  293  */
  294 
  295 static void
  296 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  297 {
  298         char *str;
  299 
  300         switch (command & IOC_DIRMASK) {
  301         case IOC_VOID:
  302                 str = "IO";
  303                 break;
  304         case IOC_OUT:
  305                 str = "IOR";
  306                 break;
  307         case IOC_IN:
  308                 str = "IOW";
  309                 break;
  310         case IOC_INOUT:
  311                 str = "IORW";
  312                 break;
  313         default:
  314                 str = "IO??";
  315         }
  316         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  317             ifp->if_xname,
  318             str,
  319             IOCGROUP(command),
  320             command & 0xff,
  321             IOCPARM_LEN(command));
  322 }
  323 #endif /* DEBUG */
  324 
  325 /************************************************************************
  326                         NETGRAPH NODE STUFF
  327  ************************************************************************/
  328 
  329 /*
  330  * Constructor for a node
  331  */
  332 static int
  333 ng_eiface_constructor(node_p node)
  334 {
  335         struct ifnet *ifp;
  336         priv_p priv;
  337         u_char eaddr[6] = {0,0,0,0,0,0};
  338 
  339         /* Allocate node and interface private structures */
  340         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  341         if (priv == NULL)
  342                 return (ENOMEM);
  343 
  344         ifp = priv->ifp = if_alloc(IFT_ETHER);
  345         if (ifp == NULL) {
  346                 free(priv, M_NETGRAPH);
  347                 return (ENOSPC);
  348         }
  349 
  350         /* Link them together */
  351         ifp->if_softc = priv;
  352 
  353         /* Get an interface unit number */
  354         priv->unit = alloc_unr(ng_eiface_unit);
  355 
  356         /* Link together node and private info */
  357         NG_NODE_SET_PRIVATE(node, priv);
  358         priv->node = node;
  359 
  360         /* Initialize interface structure */
  361         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  362         ifp->if_init = ng_eiface_init;
  363         ifp->if_output = ether_output;
  364         ifp->if_start = ng_eiface_start;
  365         ifp->if_ioctl = ng_eiface_ioctl;
  366         ifp->if_watchdog = NULL;
  367         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  368         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  369 
  370 #if 0
  371         /* Give this node name */
  372         bzero(ifname, sizeof(ifname));
  373         sprintf(ifname, "if%s", ifp->if_xname);
  374         (void)ng_name_node(node, ifname);
  375 #endif
  376 
  377         /* Attach the interface */
  378         ether_ifattach(ifp, eaddr);
  379 
  380         /* Done */
  381         return (0);
  382 }
  383 
  384 /*
  385  * Give our ok for a hook to be added
  386  */
  387 static int
  388 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  389 {
  390         priv_p priv = NG_NODE_PRIVATE(node);
  391         struct ifnet *ifp = priv->ifp;
  392 
  393         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  394                 return (EPFNOSUPPORT);
  395         if (priv->ether != NULL)
  396                 return (EISCONN);
  397         priv->ether = hook;
  398         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  399 
  400         if_link_state_change(ifp, LINK_STATE_UP);
  401 
  402         return (0);
  403 }
  404 
  405 /*
  406  * Receive a control message
  407  */
  408 static int
  409 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  410 {
  411         const priv_p priv = NG_NODE_PRIVATE(node);
  412         struct ifnet *const ifp = priv->ifp;
  413         struct ng_mesg *resp = NULL;
  414         int error = 0;
  415         struct ng_mesg *msg;
  416 
  417         NGI_GET_MSG(item, msg);
  418         switch (msg->header.typecookie) {
  419         case NGM_EIFACE_COOKIE:
  420                 switch (msg->header.cmd) {
  421 
  422                 case NGM_EIFACE_SET:
  423                     {
  424                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  425                                 error = EINVAL;
  426                                 break;
  427                         }
  428                         error = if_setlladdr(priv->ifp,
  429                             (u_char *)msg->data, ETHER_ADDR_LEN);
  430                         break;
  431                     }
  432 
  433                 case NGM_EIFACE_GET_IFNAME:
  434                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  435                         if (resp == NULL) {
  436                                 error = ENOMEM;
  437                                 break;
  438                         }
  439                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  440                         break;
  441 
  442                 case NGM_EIFACE_GET_IFADDRS:
  443                     {
  444                         struct ifaddr *ifa;
  445                         caddr_t ptr;
  446                         int buflen;
  447 
  448 #define SA_SIZE(s)      ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
  449 
  450                         /* Determine size of response and allocate it */
  451                         buflen = 0;
  452                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  453                                 buflen += SA_SIZE(ifa->ifa_addr);
  454                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  455                         if (resp == NULL) {
  456                                 error = ENOMEM;
  457                                 break;
  458                         }
  459 
  460                         /* Add addresses */
  461                         ptr = resp->data;
  462                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  463                                 const int len = SA_SIZE(ifa->ifa_addr);
  464 
  465                                 if (buflen < len) {
  466                                         log(LOG_ERR, "%s: len changed?\n",
  467                                             ifp->if_xname);
  468                                         break;
  469                                 }
  470                                 bcopy(ifa->ifa_addr, ptr, len);
  471                                 ptr += len;
  472                                 buflen -= len;
  473                         }
  474                         break;
  475 #undef SA_SIZE
  476                     }
  477 
  478                 default:
  479                         error = EINVAL;
  480                         break;
  481                 } /* end of inner switch() */
  482                 break;
  483         case NGM_FLOW_COOKIE:
  484                 switch (msg->header.cmd) {
  485                 case NGM_LINK_IS_UP:
  486                         if_link_state_change(ifp, LINK_STATE_UP);
  487                         break;
  488                 case NGM_LINK_IS_DOWN:
  489                         if_link_state_change(ifp, LINK_STATE_DOWN);
  490                         break;
  491                 default:
  492                         break;
  493                 }
  494                 break;
  495         default:
  496                 error = EINVAL;
  497                 break;
  498         }
  499         NG_RESPOND_MSG(error, node, item, resp);
  500         NG_FREE_MSG(msg);
  501         return (error);
  502 }
  503 
  504 /*
  505  * Receive data from a hook. Pass the packet to the ether_input routine.
  506  */
  507 static int
  508 ng_eiface_rcvdata(hook_p hook, item_p item)
  509 {
  510         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  511         struct ifnet *const ifp = priv->ifp;
  512         struct mbuf *m;
  513 
  514         NGI_GET_M(item, m);
  515         NG_FREE_ITEM(item);
  516 
  517         if (!((ifp->if_flags & IFF_UP) &&
  518             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  519                 NG_FREE_M(m);
  520                 return (ENETDOWN);
  521         }
  522 
  523         if (m->m_len < ETHER_HDR_LEN) {
  524                 m = m_pullup(m, ETHER_HDR_LEN);
  525                 if (m == NULL)
  526                         return (EINVAL);
  527         }
  528 
  529         /* Note receiving interface */
  530         m->m_pkthdr.rcvif = ifp;
  531 
  532         /* Update interface stats */
  533         ifp->if_ipackets++;
  534 
  535         (*ifp->if_input)(ifp, m);
  536 
  537         /* Done */
  538         return (0);
  539 }
  540 
  541 /*
  542  * Shutdown processing.
  543  */
  544 static int
  545 ng_eiface_rmnode(node_p node)
  546 {
  547         const priv_p priv = NG_NODE_PRIVATE(node);
  548         struct ifnet *const ifp = priv->ifp;
  549 
  550         ether_ifdetach(ifp);
  551         if_free(ifp);
  552         free_unr(ng_eiface_unit, priv->unit);
  553         FREE(priv, M_NETGRAPH);
  554         NG_NODE_SET_PRIVATE(node, NULL);
  555         NG_NODE_UNREF(node);
  556         return (0);
  557 }
  558 
  559 /*
  560  * Hook disconnection
  561  */
  562 static int
  563 ng_eiface_disconnect(hook_p hook)
  564 {
  565         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  566 
  567         priv->ether = NULL;
  568         return (0);
  569 }
  570 
  571 /*
  572  * Handle loading and unloading for this node type.
  573  */
  574 static int
  575 ng_eiface_mod_event(module_t mod, int event, void *data)
  576 {
  577         int error = 0;
  578 
  579         switch (event) {
  580         case MOD_LOAD:
  581                 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
  582                 break;
  583         case MOD_UNLOAD:
  584                 delete_unrhdr(ng_eiface_unit);
  585                 break;
  586         default:
  587                 error = EOPNOTSUPP;
  588                 break;
  589         }
  590         return (error);
  591 }

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