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/8.2/sys/netgraph/ng_eiface.c 215869 2010-11-26 15:44:16Z zec $
   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/proc.h>
   39 #include <sys/sockio.h>
   40 #include <sys/socket.h>
   41 #include <sys/syslog.h>
   42 
   43 #include <net/if.h>
   44 #include <net/if_types.h>
   45 #include <net/netisr.h>
   46 #include <net/route.h>
   47 #include <net/vnet.h>
   48 
   49 #include <netgraph/ng_message.h>
   50 #include <netgraph/netgraph.h>
   51 #include <netgraph/ng_parse.h>
   52 #include <netgraph/ng_eiface.h>
   53 
   54 #include <net/bpf.h>
   55 #include <net/ethernet.h>
   56 #include <net/if_arp.h>
   57 
   58 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   59         {
   60           NGM_EIFACE_COOKIE,
   61           NGM_EIFACE_GET_IFNAME,
   62           "getifname",
   63           NULL,
   64           &ng_parse_string_type
   65         },
   66         {
   67           NGM_EIFACE_COOKIE,
   68           NGM_EIFACE_SET,
   69           "set",
   70           &ng_parse_enaddr_type,
   71           NULL
   72         },
   73         { 0 }
   74 };
   75 
   76 /* Node private data */
   77 struct ng_eiface_private {
   78         struct ifnet    *ifp;           /* per-interface network data */
   79         int             unit;           /* Interface unit number */
   80         node_p          node;           /* Our netgraph node */
   81         hook_p          ether;          /* Hook for ethernet stream */
   82 };
   83 typedef struct ng_eiface_private *priv_p;
   84 
   85 /* Interface methods */
   86 static void     ng_eiface_init(void *xsc);
   87 static void     ng_eiface_start(struct ifnet *ifp);
   88 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   89 #ifdef DEBUG
   90 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
   91 #endif
   92 
   93 /* Netgraph methods */
   94 static int              ng_eiface_mod_event(module_t, int, void *);
   95 static ng_constructor_t ng_eiface_constructor;
   96 static ng_rcvmsg_t      ng_eiface_rcvmsg;
   97 static ng_shutdown_t    ng_eiface_rmnode;
   98 static ng_newhook_t     ng_eiface_newhook;
   99 static ng_rcvdata_t     ng_eiface_rcvdata;
  100 static ng_disconnect_t  ng_eiface_disconnect;
  101 
  102 /* Node type descriptor */
  103 static struct ng_type typestruct = {
  104         .version =      NG_ABI_VERSION,
  105         .name =         NG_EIFACE_NODE_TYPE,
  106         .mod_event =    ng_eiface_mod_event,
  107         .constructor =  ng_eiface_constructor,
  108         .rcvmsg =       ng_eiface_rcvmsg,
  109         .shutdown =     ng_eiface_rmnode,
  110         .newhook =      ng_eiface_newhook,
  111         .rcvdata =      ng_eiface_rcvdata,
  112         .disconnect =   ng_eiface_disconnect,
  113         .cmdlist =      ng_eiface_cmdlist
  114 };
  115 NETGRAPH_INIT(eiface, &typestruct);
  116 
  117 static VNET_DEFINE(struct unrhdr *, ng_eiface_unit);
  118 #define V_ng_eiface_unit                VNET(ng_eiface_unit)
  119 
  120 /************************************************************************
  121                         INTERFACE STUFF
  122  ************************************************************************/
  123 
  124 /*
  125  * Process an ioctl for the virtual interface
  126  */
  127 static int
  128 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  129 {
  130         struct ifreq *const ifr = (struct ifreq *)data;
  131         int s, error = 0;
  132 
  133 #ifdef DEBUG
  134         ng_eiface_print_ioctl(ifp, command, data);
  135 #endif
  136         s = splimp();
  137         switch (command) {
  138 
  139         /* These two are mostly handled at a higher layer */
  140         case SIOCSIFADDR:
  141                 error = ether_ioctl(ifp, command, data);
  142                 break;
  143         case SIOCGIFADDR:
  144                 break;
  145 
  146         /* Set flags */
  147         case SIOCSIFFLAGS:
  148                 /*
  149                  * If the interface is marked up and stopped, then start it.
  150                  * If it is marked down and running, then stop it.
  151                  */
  152                 if (ifp->if_flags & IFF_UP) {
  153                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  154                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  155                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  156                         }
  157                 } else {
  158                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  159                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  160                                     IFF_DRV_OACTIVE);
  161                 }
  162                 break;
  163 
  164         /* Set the interface MTU */
  165         case SIOCSIFMTU:
  166                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  167                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  168                         error = EINVAL;
  169                 else
  170                         ifp->if_mtu = ifr->ifr_mtu;
  171                 break;
  172 
  173         /* Stuff that's not supported */
  174         case SIOCADDMULTI:
  175         case SIOCDELMULTI:
  176                 error = 0;
  177                 break;
  178         case SIOCSIFPHYS:
  179                 error = EOPNOTSUPP;
  180                 break;
  181 
  182         default:
  183                 error = EINVAL;
  184                 break;
  185         }
  186         splx(s);
  187         return (error);
  188 }
  189 
  190 static void
  191 ng_eiface_init(void *xsc)
  192 {
  193         priv_p sc = xsc;
  194         struct ifnet *ifp = sc->ifp;
  195         int s;
  196 
  197         s = splimp();
  198 
  199         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  200         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  201 
  202         splx(s);
  203 }
  204 
  205 /*
  206  * We simply relay the packet to the "ether" hook, if it is connected.
  207  * We have been through the netgraph locking and are guaranteed to
  208  * be the only code running in this node at this time.
  209  */
  210 static void
  211 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  212 {
  213         struct ifnet *ifp = arg1;
  214         const priv_p priv = (priv_p)ifp->if_softc;
  215         int error = 0;
  216         struct mbuf *m;
  217 
  218         /* Check interface flags */
  219 
  220         if (!((ifp->if_flags & IFF_UP) &&
  221             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  222                 return;
  223 
  224         for (;;) {
  225                 /*
  226                  * Grab a packet to transmit.
  227                  */
  228                 IF_DEQUEUE(&ifp->if_snd, m);
  229 
  230                 /* If there's nothing to send, break. */
  231                 if (m == NULL)
  232                         break;
  233 
  234                 /*
  235                  * Berkeley packet filter.
  236                  * Pass packet to bpf if there is a listener.
  237                  * XXX is this safe? locking?
  238                  */
  239                 BPF_MTAP(ifp, m);
  240 
  241                 if (ifp->if_flags & IFF_MONITOR) {
  242                         ifp->if_ipackets++;
  243                         m_freem(m);
  244                         continue;
  245                 }
  246 
  247                 /*
  248                  * Send packet; if hook is not connected, mbuf will get
  249                  * freed.
  250                  */
  251                 NG_OUTBOUND_THREAD_REF();
  252                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  253                 NG_OUTBOUND_THREAD_UNREF();
  254 
  255                 /* Update stats */
  256                 if (error == 0)
  257                         ifp->if_opackets++;
  258                 else
  259                         ifp->if_oerrors++;
  260         }
  261 
  262         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  263 
  264         return;
  265 }
  266 
  267 /*
  268  * This routine is called to deliver a packet out the interface.
  269  * We simply queue the netgraph version to be called when netgraph locking
  270  * allows it to happen.
  271  * Until we know what the rest of the networking code is doing for
  272  * locking, we don't know how we will interact with it.
  273  * Take comfort from the fact that the ifnet struct is part of our
  274  * private info and can't go away while we are queued.
  275  * [Though we don't know it is still there now....]
  276  * it is possible we don't gain anything from this because
  277  * we would like to get the mbuf and queue it as data
  278  * somehow, but we can't and if we did would we solve anything?
  279  */
  280 static void
  281 ng_eiface_start(struct ifnet *ifp)
  282 {
  283 
  284         const priv_p priv = (priv_p)ifp->if_softc;
  285 
  286         /* Don't do anything if output is active */
  287         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  288                 return;
  289 
  290         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  291 
  292         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  293                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  294 }
  295 
  296 #ifdef DEBUG
  297 /*
  298  * Display an ioctl to the virtual interface
  299  */
  300 
  301 static void
  302 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  303 {
  304         char *str;
  305 
  306         switch (command & IOC_DIRMASK) {
  307         case IOC_VOID:
  308                 str = "IO";
  309                 break;
  310         case IOC_OUT:
  311                 str = "IOR";
  312                 break;
  313         case IOC_IN:
  314                 str = "IOW";
  315                 break;
  316         case IOC_INOUT:
  317                 str = "IORW";
  318                 break;
  319         default:
  320                 str = "IO??";
  321         }
  322         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  323             ifp->if_xname,
  324             str,
  325             IOCGROUP(command),
  326             command & 0xff,
  327             IOCPARM_LEN(command));
  328 }
  329 #endif /* DEBUG */
  330 
  331 /************************************************************************
  332                         NETGRAPH NODE STUFF
  333  ************************************************************************/
  334 
  335 /*
  336  * Constructor for a node
  337  */
  338 static int
  339 ng_eiface_constructor(node_p node)
  340 {
  341         struct ifnet *ifp;
  342         priv_p priv;
  343         u_char eaddr[6] = {0,0,0,0,0,0};
  344 
  345         /* Allocate node and interface private structures */
  346         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  347         if (priv == NULL)
  348                 return (ENOMEM);
  349 
  350         ifp = priv->ifp = if_alloc(IFT_ETHER);
  351         if (ifp == NULL) {
  352                 free(priv, M_NETGRAPH);
  353                 return (ENOSPC);
  354         }
  355 
  356         /* Link them together */
  357         ifp->if_softc = priv;
  358 
  359         /* Get an interface unit number */
  360         priv->unit = alloc_unr(V_ng_eiface_unit);
  361 
  362         /* Link together node and private info */
  363         NG_NODE_SET_PRIVATE(node, priv);
  364         priv->node = node;
  365 
  366         /* Initialize interface structure */
  367         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  368         ifp->if_init = ng_eiface_init;
  369         ifp->if_output = ether_output;
  370         ifp->if_start = ng_eiface_start;
  371         ifp->if_ioctl = ng_eiface_ioctl;
  372         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  373         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  374         ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  375         ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  376 
  377         /* Give this node the same name as the interface (if possible) */
  378         if (ng_name_node(node, ifp->if_xname) != 0)
  379                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  380                     ifp->if_xname);
  381 
  382         /* Attach the interface */
  383         ether_ifattach(ifp, eaddr);
  384 
  385         /* Done */
  386         return (0);
  387 }
  388 
  389 /*
  390  * Give our ok for a hook to be added
  391  */
  392 static int
  393 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  394 {
  395         priv_p priv = NG_NODE_PRIVATE(node);
  396         struct ifnet *ifp = priv->ifp;
  397 
  398         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  399                 return (EPFNOSUPPORT);
  400         if (priv->ether != NULL)
  401                 return (EISCONN);
  402         priv->ether = hook;
  403         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  404         NG_HOOK_SET_TO_INBOUND(hook);
  405 
  406         if_link_state_change(ifp, LINK_STATE_UP);
  407 
  408         return (0);
  409 }
  410 
  411 /*
  412  * Receive a control message
  413  */
  414 static int
  415 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  416 {
  417         const priv_p priv = NG_NODE_PRIVATE(node);
  418         struct ifnet *const ifp = priv->ifp;
  419         struct ng_mesg *resp = NULL;
  420         int error = 0;
  421         struct ng_mesg *msg;
  422 
  423         NGI_GET_MSG(item, msg);
  424         switch (msg->header.typecookie) {
  425         case NGM_EIFACE_COOKIE:
  426                 switch (msg->header.cmd) {
  427 
  428                 case NGM_EIFACE_SET:
  429                     {
  430                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  431                                 error = EINVAL;
  432                                 break;
  433                         }
  434                         error = if_setlladdr(priv->ifp,
  435                             (u_char *)msg->data, ETHER_ADDR_LEN);
  436                         EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
  437                         break;
  438                     }
  439 
  440                 case NGM_EIFACE_GET_IFNAME:
  441                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  442                         if (resp == NULL) {
  443                                 error = ENOMEM;
  444                                 break;
  445                         }
  446                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  447                         break;
  448 
  449                 case NGM_EIFACE_GET_IFADDRS:
  450                     {
  451                         struct ifaddr *ifa;
  452                         caddr_t ptr;
  453                         int buflen;
  454 
  455                         /* Determine size of response and allocate it */
  456                         buflen = 0;
  457                         if_addr_rlock(ifp);
  458                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  459                                 buflen += SA_SIZE(ifa->ifa_addr);
  460                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  461                         if (resp == NULL) {
  462                                 if_addr_runlock(ifp);
  463                                 error = ENOMEM;
  464                                 break;
  465                         }
  466 
  467                         /* Add addresses */
  468                         ptr = resp->data;
  469                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  470                                 const int len = SA_SIZE(ifa->ifa_addr);
  471 
  472                                 if (buflen < len) {
  473                                         log(LOG_ERR, "%s: len changed?\n",
  474                                             ifp->if_xname);
  475                                         break;
  476                                 }
  477                                 bcopy(ifa->ifa_addr, ptr, len);
  478                                 ptr += len;
  479                                 buflen -= len;
  480                         }
  481                         if_addr_runlock(ifp);
  482                         break;
  483                     }
  484 
  485                 default:
  486                         error = EINVAL;
  487                         break;
  488                 } /* end of inner switch() */
  489                 break;
  490         case NGM_FLOW_COOKIE:
  491                 switch (msg->header.cmd) {
  492                 case NGM_LINK_IS_UP:
  493                         if_link_state_change(ifp, LINK_STATE_UP);
  494                         break;
  495                 case NGM_LINK_IS_DOWN:
  496                         if_link_state_change(ifp, LINK_STATE_DOWN);
  497                         break;
  498                 default:
  499                         break;
  500                 }
  501                 break;
  502         default:
  503                 error = EINVAL;
  504                 break;
  505         }
  506         NG_RESPOND_MSG(error, node, item, resp);
  507         NG_FREE_MSG(msg);
  508         return (error);
  509 }
  510 
  511 /*
  512  * Receive data from a hook. Pass the packet to the ether_input routine.
  513  */
  514 static int
  515 ng_eiface_rcvdata(hook_p hook, item_p item)
  516 {
  517         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  518         struct ifnet *const ifp = priv->ifp;
  519         struct mbuf *m;
  520 
  521         NGI_GET_M(item, m);
  522         NG_FREE_ITEM(item);
  523 
  524         if (!((ifp->if_flags & IFF_UP) &&
  525             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  526                 NG_FREE_M(m);
  527                 return (ENETDOWN);
  528         }
  529 
  530         if (m->m_len < ETHER_HDR_LEN) {
  531                 m = m_pullup(m, ETHER_HDR_LEN);
  532                 if (m == NULL)
  533                         return (EINVAL);
  534         }
  535 
  536         /* Note receiving interface */
  537         m->m_pkthdr.rcvif = ifp;
  538 
  539         /* Update interface stats */
  540         ifp->if_ipackets++;
  541 
  542         (*ifp->if_input)(ifp, m);
  543 
  544         /* Done */
  545         return (0);
  546 }
  547 
  548 /*
  549  * Shutdown processing.
  550  */
  551 static int
  552 ng_eiface_rmnode(node_p node)
  553 {
  554         const priv_p priv = NG_NODE_PRIVATE(node);
  555         struct ifnet *const ifp = priv->ifp;
  556 
  557         /*
  558          * the ifnet may be in a different vnet than the netgraph node, 
  559          * hence we have to change the current vnet context here.
  560          */
  561         CURVNET_SET_QUIET(ifp->if_vnet);
  562         ether_ifdetach(ifp);
  563         if_free(ifp);
  564         CURVNET_RESTORE();
  565         free_unr(V_ng_eiface_unit, priv->unit);
  566         free(priv, M_NETGRAPH);
  567         NG_NODE_SET_PRIVATE(node, NULL);
  568         NG_NODE_UNREF(node);
  569         return (0);
  570 }
  571 
  572 /*
  573  * Hook disconnection
  574  */
  575 static int
  576 ng_eiface_disconnect(hook_p hook)
  577 {
  578         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  579 
  580         priv->ether = NULL;
  581         return (0);
  582 }
  583 
  584 /*
  585  * Handle loading and unloading for this node type.
  586  */
  587 static int
  588 ng_eiface_mod_event(module_t mod, int event, void *data)
  589 {
  590         int error = 0;
  591 
  592         switch (event) {
  593         case MOD_LOAD:
  594         case MOD_UNLOAD:
  595                 break;
  596         default:
  597                 error = EOPNOTSUPP;
  598                 break;
  599         }
  600         return (error);
  601 }
  602 
  603 static void
  604 vnet_ng_eiface_init(const void *unused)
  605 {
  606 
  607         V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
  608 }
  609 VNET_SYSINIT(vnet_ng_eiface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  610     vnet_ng_eiface_init, NULL);
  611 
  612 static void
  613 vnet_ng_eiface_uninit(const void *unused)
  614 {
  615 
  616         delete_unrhdr(V_ng_eiface_unit);
  617 }
  618 VNET_SYSUNINIT(vnet_ng_eiface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  619    vnet_ng_eiface_uninit, NULL);
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FreeBSD/Linux Kernel Cross Reference sys/netgraph/ng_eiface.c

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