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

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    1 /*
    2  * ng_iface.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Archie Cobbs <archie@freebsd.org>
   39  *
   40  * $FreeBSD$
   41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 /*
   45  * This node is also a system networking interface. It has
   46  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
   47  * are simply relayed between the interface and the hooks.
   48  *
   49  * Interfaces are named ng0, ng1, etc.  New nodes take the
   50  * first available interface name.
   51  *
   52  * This node also includes Berkeley packet filter support.
   53  */
   54 
   55 #include "opt_atalk.h"
   56 #include "opt_inet.h"
   57 #include "opt_inet6.h"
   58 #include "opt_ipx.h"
   59 
   60 #include <sys/param.h>
   61 #include <sys/systm.h>
   62 #include <sys/errno.h>
   63 #include <sys/kernel.h>
   64 #include <sys/malloc.h>
   65 #include <sys/mbuf.h>
   66 #include <sys/errno.h>
   67 #include <sys/random.h>
   68 #include <sys/sockio.h>
   69 #include <sys/socket.h>
   70 #include <sys/syslog.h>
   71 #include <sys/libkern.h>
   72 
   73 #include <net/if.h>
   74 #include <net/if_types.h>
   75 #include <net/bpf.h>
   76 #include <net/netisr.h>
   77 
   78 #include <netinet/in.h>
   79 
   80 #include <netgraph/ng_message.h>
   81 #include <netgraph/netgraph.h>
   82 #include <netgraph/ng_parse.h>
   83 #include <netgraph/ng_iface.h>
   84 #include <netgraph/ng_cisco.h>
   85 
   86 #ifdef NG_SEPARATE_MALLOC
   87 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
   88 #else
   89 #define M_NETGRAPH_IFACE M_NETGRAPH
   90 #endif
   91 
   92 /* This struct describes one address family */
   93 struct iffam {
   94         sa_family_t     family;         /* Address family */
   95         const char      *hookname;      /* Name for hook */
   96 };
   97 typedef const struct iffam *iffam_p;
   98 
   99 /* List of address families supported by our interface */
  100 const static struct iffam gFamilies[] = {
  101         { AF_INET,      NG_IFACE_HOOK_INET      },
  102         { AF_INET6,     NG_IFACE_HOOK_INET6     },
  103         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
  104         { AF_IPX,       NG_IFACE_HOOK_IPX       },
  105         { AF_ATM,       NG_IFACE_HOOK_ATM       },
  106         { AF_NATM,      NG_IFACE_HOOK_NATM      },
  107 };
  108 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
  109 
  110 /* Node private data */
  111 struct ng_iface_private {
  112         struct  ifnet *ifp;             /* Our interface */
  113         int     unit;                   /* Interface unit number */
  114         node_p  node;                   /* Our netgraph node */
  115         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
  116 };
  117 typedef struct ng_iface_private *priv_p;
  118 
  119 /* Interface methods */
  120 static void     ng_iface_start(struct ifnet *ifp);
  121 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  122 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
  123                         struct sockaddr *dst, struct rtentry *rt0);
  124 static void     ng_iface_bpftap(struct ifnet *ifp,
  125                         struct mbuf *m, sa_family_t family);
  126 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
  127                         sa_family_t sa);
  128 #ifdef DEBUG
  129 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  130 #endif
  131 
  132 /* Netgraph methods */
  133 static int              ng_iface_mod_event(module_t, int, void *);
  134 static ng_constructor_t ng_iface_constructor;
  135 static ng_rcvmsg_t      ng_iface_rcvmsg;
  136 static ng_shutdown_t    ng_iface_shutdown;
  137 static ng_newhook_t     ng_iface_newhook;
  138 static ng_rcvdata_t     ng_iface_rcvdata;
  139 static ng_disconnect_t  ng_iface_disconnect;
  140 
  141 /* Helper stuff */
  142 static iffam_p  get_iffam_from_af(sa_family_t family);
  143 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  144 static iffam_p  get_iffam_from_name(const char *name);
  145 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  146 
  147 /* Parse type for struct ng_cisco_ipaddr */
  148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
  149         = NG_CISCO_IPADDR_TYPE_INFO;
  150 static const struct ng_parse_type ng_cisco_ipaddr_type = {
  151         &ng_parse_struct_type,
  152         &ng_cisco_ipaddr_type_fields
  153 };
  154 
  155 /* List of commands and how to convert arguments to/from ASCII */
  156 static const struct ng_cmdlist ng_iface_cmds[] = {
  157         {
  158           NGM_IFACE_COOKIE,
  159           NGM_IFACE_GET_IFNAME,
  160           "getifname",
  161           NULL,
  162           &ng_parse_string_type
  163         },
  164         {
  165           NGM_IFACE_COOKIE,
  166           NGM_IFACE_POINT2POINT,
  167           "point2point",
  168           NULL,
  169           NULL
  170         },
  171         {
  172           NGM_IFACE_COOKIE,
  173           NGM_IFACE_BROADCAST,
  174           "broadcast",
  175           NULL,
  176           NULL
  177         },
  178         {
  179           NGM_CISCO_COOKIE,
  180           NGM_CISCO_GET_IPADDR,
  181           "getipaddr",
  182           NULL,
  183           &ng_cisco_ipaddr_type
  184         },
  185         {
  186           NGM_IFACE_COOKIE,
  187           NGM_IFACE_GET_IFINDEX,
  188           "getifindex",
  189           NULL,
  190           &ng_parse_uint32_type
  191         },
  192         { 0 }
  193 };
  194 
  195 /* Node type descriptor */
  196 static struct ng_type typestruct = {
  197         .version =      NG_ABI_VERSION,
  198         .name =         NG_IFACE_NODE_TYPE,
  199         .mod_event =    ng_iface_mod_event,
  200         .constructor =  ng_iface_constructor,
  201         .rcvmsg =       ng_iface_rcvmsg,
  202         .shutdown =     ng_iface_shutdown,
  203         .newhook =      ng_iface_newhook,
  204         .rcvdata =      ng_iface_rcvdata,
  205         .disconnect =   ng_iface_disconnect,
  206         .cmdlist =      ng_iface_cmds,
  207 };
  208 NETGRAPH_INIT(iface, &typestruct);
  209 
  210 static struct unrhdr    *ng_iface_unit;
  211 
  212 /************************************************************************
  213                         HELPER STUFF
  214  ************************************************************************/
  215 
  216 /*
  217  * Get the family descriptor from the family ID
  218  */
  219 static __inline iffam_p
  220 get_iffam_from_af(sa_family_t family)
  221 {
  222         iffam_p iffam;
  223         int k;
  224 
  225         for (k = 0; k < NUM_FAMILIES; k++) {
  226                 iffam = &gFamilies[k];
  227                 if (iffam->family == family)
  228                         return (iffam);
  229         }
  230         return (NULL);
  231 }
  232 
  233 /*
  234  * Get the family descriptor from the hook
  235  */
  236 static __inline iffam_p
  237 get_iffam_from_hook(priv_p priv, hook_p hook)
  238 {
  239         int k;
  240 
  241         for (k = 0; k < NUM_FAMILIES; k++)
  242                 if (priv->hooks[k] == hook)
  243                         return (&gFamilies[k]);
  244         return (NULL);
  245 }
  246 
  247 /*
  248  * Get the hook from the iffam descriptor
  249  */
  250 
  251 static __inline hook_p *
  252 get_hook_from_iffam(priv_p priv, iffam_p iffam)
  253 {
  254         return (&priv->hooks[iffam - gFamilies]);
  255 }
  256 
  257 /*
  258  * Get the iffam descriptor from the name
  259  */
  260 static __inline iffam_p
  261 get_iffam_from_name(const char *name)
  262 {
  263         iffam_p iffam;
  264         int k;
  265 
  266         for (k = 0; k < NUM_FAMILIES; k++) {
  267                 iffam = &gFamilies[k];
  268                 if (!strcmp(iffam->hookname, name))
  269                         return (iffam);
  270         }
  271         return (NULL);
  272 }
  273 
  274 /************************************************************************
  275                         INTERFACE STUFF
  276  ************************************************************************/
  277 
  278 /*
  279  * Process an ioctl for the virtual interface
  280  */
  281 static int
  282 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  283 {
  284         struct ifreq *const ifr = (struct ifreq *) data;
  285         int s, error = 0;
  286 
  287 #ifdef DEBUG
  288         ng_iface_print_ioctl(ifp, command, data);
  289 #endif
  290         s = splimp();
  291         switch (command) {
  292 
  293         /* These two are mostly handled at a higher layer */
  294         case SIOCSIFADDR:
  295                 ifp->if_flags |= IFF_UP;
  296                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  297                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  298                 break;
  299         case SIOCGIFADDR:
  300                 break;
  301 
  302         /* Set flags */
  303         case SIOCSIFFLAGS:
  304                 /*
  305                  * If the interface is marked up and stopped, then start it.
  306                  * If it is marked down and running, then stop it.
  307                  */
  308                 if (ifr->ifr_flags & IFF_UP) {
  309                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  310                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  311                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  312                         }
  313                 } else {
  314                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  315                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  316                                     IFF_DRV_OACTIVE);
  317                 }
  318                 break;
  319 
  320         /* Set the interface MTU */
  321         case SIOCSIFMTU:
  322                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  323                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  324                         error = EINVAL;
  325                 else
  326                         ifp->if_mtu = ifr->ifr_mtu;
  327                 break;
  328 
  329         /* Stuff that's not supported */
  330         case SIOCADDMULTI:
  331         case SIOCDELMULTI:
  332                 error = 0;
  333                 break;
  334         case SIOCSIFPHYS:
  335                 error = EOPNOTSUPP;
  336                 break;
  337 
  338         default:
  339                 error = EINVAL;
  340                 break;
  341         }
  342         (void) splx(s);
  343         return (error);
  344 }
  345 
  346 /*
  347  * This routine is called to deliver a packet out the interface.
  348  * We simply look at the address family and relay the packet to
  349  * the corresponding hook, if it exists and is connected.
  350  */
  351 
  352 static int
  353 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  354                 struct sockaddr *dst, struct rtentry *rt0)
  355 {
  356         uint32_t af;
  357         int error;
  358 
  359         /* Check interface flags */
  360         if (!((ifp->if_flags & IFF_UP) &&
  361             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  362                 m_freem(m);
  363                 return (ENETDOWN);
  364         }
  365 
  366         /* BPF writes need to be handled specially. */
  367         if (dst->sa_family == AF_UNSPEC) {
  368                 bcopy(dst->sa_data, &af, sizeof(af));
  369                 dst->sa_family = af;
  370         }
  371 
  372         /* Berkeley packet filter */
  373         ng_iface_bpftap(ifp, m, dst->sa_family);
  374 
  375         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  376                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
  377                 if (m == NULL) {
  378                         IFQ_LOCK(&ifp->if_snd);
  379                         IFQ_INC_DROPS(&ifp->if_snd);
  380                         IFQ_UNLOCK(&ifp->if_snd);
  381                         ifp->if_oerrors++;
  382                         return (ENOBUFS);
  383                 }
  384                 *(sa_family_t *)m->m_data = dst->sa_family;
  385                 IFQ_HANDOFF(ifp, m, error);
  386         } else
  387                 error = ng_iface_send(ifp, m, dst->sa_family);
  388 
  389         return (error);
  390 }
  391 
  392 /*
  393  * Start method is used only when ALTQ is enabled.
  394  */
  395 static void
  396 ng_iface_start(struct ifnet *ifp)
  397 {
  398         struct mbuf *m;
  399         sa_family_t sa;
  400 
  401         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  402 
  403         for(;;) {
  404                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  405                 if (m == NULL)
  406                         break;
  407                 sa = *mtod(m, sa_family_t *);
  408                 m_adj(m, sizeof(sa_family_t));
  409                 ng_iface_send(ifp, m, sa);
  410         }
  411 }
  412 
  413 /*
  414  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  415  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  416  */
  417 static void
  418 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  419 {
  420         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  421         if (bpf_peers_present(ifp->if_bpf)) {
  422                 int32_t family4 = (int32_t)family;
  423                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  424         }
  425 }
  426 
  427 /*
  428  * This routine does actual delivery of the packet into the
  429  * netgraph(4). It is called from ng_iface_start() and
  430  * ng_iface_output().
  431  */
  432 static int
  433 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  434 {
  435         const priv_p priv = (priv_p) ifp->if_softc;
  436         const iffam_p iffam = get_iffam_from_af(sa);
  437         int error;
  438         int len;
  439 
  440         /* Check address family to determine hook (if known) */
  441         if (iffam == NULL) {
  442                 m_freem(m);
  443                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  444                 return (EAFNOSUPPORT);
  445         }
  446 
  447         /* Copy length before the mbuf gets invalidated. */
  448         len = m->m_pkthdr.len;
  449 
  450         /* Send packet. If hook is not connected,
  451            mbuf will get freed. */
  452         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
  453 
  454         /* Update stats. */
  455         if (error == 0) {
  456                 ifp->if_obytes += len;
  457                 ifp->if_opackets++;
  458         }
  459 
  460         return (error);
  461 }
  462 
  463 #ifdef DEBUG
  464 /*
  465  * Display an ioctl to the virtual interface
  466  */
  467 
  468 static void
  469 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  470 {
  471         char   *str;
  472 
  473         switch (command & IOC_DIRMASK) {
  474         case IOC_VOID:
  475                 str = "IO";
  476                 break;
  477         case IOC_OUT:
  478                 str = "IOR";
  479                 break;
  480         case IOC_IN:
  481                 str = "IOW";
  482                 break;
  483         case IOC_INOUT:
  484                 str = "IORW";
  485                 break;
  486         default:
  487                 str = "IO??";
  488         }
  489         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  490                ifp->if_xname,
  491                str,
  492                IOCGROUP(command),
  493                command & 0xff,
  494                IOCPARM_LEN(command));
  495 }
  496 #endif /* DEBUG */
  497 
  498 /************************************************************************
  499                         NETGRAPH NODE STUFF
  500  ************************************************************************/
  501 
  502 /*
  503  * Constructor for a node
  504  */
  505 static int
  506 ng_iface_constructor(node_p node)
  507 {
  508         struct ifnet *ifp;
  509         priv_p priv;
  510 
  511         /* Allocate node and interface private structures */
  512         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
  513         if (priv == NULL)
  514                 return (ENOMEM);
  515         ifp = if_alloc(IFT_PROPVIRTUAL);
  516         if (ifp == NULL) {
  517                 FREE(priv, M_NETGRAPH_IFACE);
  518                 return (ENOMEM);
  519         }
  520 
  521         /* Link them together */
  522         ifp->if_softc = priv;
  523         priv->ifp = ifp;
  524 
  525         /* Get an interface unit number */
  526         priv->unit = alloc_unr(ng_iface_unit);
  527 
  528         /* Link together node and private info */
  529         NG_NODE_SET_PRIVATE(node, priv);
  530         priv->node = node;
  531 
  532         /* Initialize interface structure */
  533         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  534         ifp->if_output = ng_iface_output;
  535         ifp->if_start = ng_iface_start;
  536         ifp->if_ioctl = ng_iface_ioctl;
  537         ifp->if_watchdog = NULL;
  538         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  539         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  540         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  541         ifp->if_addrlen = 0;                    /* XXX */
  542         ifp->if_hdrlen = 0;                     /* XXX */
  543         ifp->if_baudrate = 64000;               /* XXX */
  544         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
  545         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
  546         IFQ_SET_READY(&ifp->if_snd);
  547 
  548         /* Give this node the same name as the interface (if possible) */
  549         if (ng_name_node(node, ifp->if_xname) != 0)
  550                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  551                     ifp->if_xname);
  552 
  553         /* Attach the interface */
  554         if_attach(ifp);
  555         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  556 
  557         /* Done */
  558         return (0);
  559 }
  560 
  561 /*
  562  * Give our ok for a hook to be added
  563  */
  564 static int
  565 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  566 {
  567         const iffam_p iffam = get_iffam_from_name(name);
  568         hook_p *hookptr;
  569 
  570         if (iffam == NULL)
  571                 return (EPFNOSUPPORT);
  572         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  573         if (*hookptr != NULL)
  574                 return (EISCONN);
  575         *hookptr = hook;
  576         NG_HOOK_HI_STACK(hook);
  577         return (0);
  578 }
  579 
  580 /*
  581  * Receive a control message
  582  */
  583 static int
  584 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  585 {
  586         const priv_p priv = NG_NODE_PRIVATE(node);
  587         struct ifnet *const ifp = priv->ifp;
  588         struct ng_mesg *resp = NULL;
  589         int error = 0;
  590         struct ng_mesg *msg;
  591 
  592         NGI_GET_MSG(item, msg);
  593         switch (msg->header.typecookie) {
  594         case NGM_IFACE_COOKIE:
  595                 switch (msg->header.cmd) {
  596                 case NGM_IFACE_GET_IFNAME:
  597                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  598                         if (resp == NULL) {
  599                                 error = ENOMEM;
  600                                 break;
  601                         }
  602                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  603                         break;
  604 
  605                 case NGM_IFACE_POINT2POINT:
  606                 case NGM_IFACE_BROADCAST:
  607                     {
  608 
  609                         /* Deny request if interface is UP */
  610                         if ((ifp->if_flags & IFF_UP) != 0)
  611                                 return (EBUSY);
  612 
  613                         /* Change flags */
  614                         switch (msg->header.cmd) {
  615                         case NGM_IFACE_POINT2POINT:
  616                                 ifp->if_flags |= IFF_POINTOPOINT;
  617                                 ifp->if_flags &= ~IFF_BROADCAST;
  618                                 break;
  619                         case NGM_IFACE_BROADCAST:
  620                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  621                                 ifp->if_flags |= IFF_BROADCAST;
  622                                 break;
  623                         }
  624                         break;
  625                     }
  626 
  627                 case NGM_IFACE_GET_IFINDEX:
  628                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  629                         if (resp == NULL) {
  630                                 error = ENOMEM;
  631                                 break;
  632                         }
  633                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  634                         break;
  635 
  636                 default:
  637                         error = EINVAL;
  638                         break;
  639                 }
  640                 break;
  641         case NGM_CISCO_COOKIE:
  642                 switch (msg->header.cmd) {
  643                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
  644                     {
  645                         struct ifaddr *ifa;
  646 
  647                         /* Return the first configured IP address */
  648                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  649                                 struct ng_cisco_ipaddr *ips;
  650 
  651                                 if (ifa->ifa_addr->sa_family != AF_INET)
  652                                         continue;
  653                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
  654                                 if (resp == NULL) {
  655                                         error = ENOMEM;
  656                                         break;
  657                                 }
  658                                 ips = (struct ng_cisco_ipaddr *)resp->data;
  659                                 ips->ipaddr = ((struct sockaddr_in *)
  660                                                 ifa->ifa_addr)->sin_addr;
  661                                 ips->netmask = ((struct sockaddr_in *)
  662                                                 ifa->ifa_netmask)->sin_addr;
  663                                 break;
  664                         }
  665 
  666                         /* No IP addresses on this interface? */
  667                         if (ifa == NULL)
  668                                 error = EADDRNOTAVAIL;
  669                         break;
  670                     }
  671                 default:
  672                         error = EINVAL;
  673                         break;
  674                 }
  675                 break;
  676         case NGM_FLOW_COOKIE:
  677                 switch (msg->header.cmd) {
  678                 case NGM_LINK_IS_UP:
  679                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  680                         break;
  681                 case NGM_LINK_IS_DOWN:
  682                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  683                         break;
  684                 default:
  685                         break;
  686                 }
  687                 break;
  688         default:
  689                 error = EINVAL;
  690                 break;
  691         }
  692         NG_RESPOND_MSG(error, node, item, resp);
  693         NG_FREE_MSG(msg);
  694         return (error);
  695 }
  696 
  697 /*
  698  * Recive data from a hook. Pass the packet to the correct input routine.
  699  */
  700 static int
  701 ng_iface_rcvdata(hook_p hook, item_p item)
  702 {
  703         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  704         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  705         struct ifnet *const ifp = priv->ifp;
  706         struct mbuf *m;
  707         int isr;
  708 
  709         NGI_GET_M(item, m);
  710         NG_FREE_ITEM(item);
  711         /* Sanity checks */
  712         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  713         M_ASSERTPKTHDR(m);
  714         if ((ifp->if_flags & IFF_UP) == 0) {
  715                 NG_FREE_M(m);
  716                 return (ENETDOWN);
  717         }
  718 
  719         /* Update interface stats */
  720         ifp->if_ipackets++;
  721         ifp->if_ibytes += m->m_pkthdr.len;
  722 
  723         /* Note receiving interface */
  724         m->m_pkthdr.rcvif = ifp;
  725 
  726         /* Berkeley packet filter */
  727         ng_iface_bpftap(ifp, m, iffam->family);
  728 
  729         /* Send packet */
  730         switch (iffam->family) {
  731 #ifdef INET
  732         case AF_INET:
  733                 isr = NETISR_IP;
  734                 break;
  735 #endif
  736 #ifdef INET6
  737         case AF_INET6:
  738                 isr = NETISR_IPV6;
  739                 break;
  740 #endif
  741 #ifdef IPX
  742         case AF_IPX:
  743                 isr = NETISR_IPX;
  744                 break;
  745 #endif
  746 #ifdef NETATALK
  747         case AF_APPLETALK:
  748                 isr = NETISR_ATALK2;
  749                 break;
  750 #endif
  751         default:
  752                 m_freem(m);
  753                 return (EAFNOSUPPORT);
  754         }
  755         /* First chunk of an mbuf contains good junk */
  756         if (harvest.point_to_point)
  757                 random_harvest(m, 16, 3, 0, RANDOM_NET);
  758         netisr_dispatch(isr, m);
  759         return (0);
  760 }
  761 
  762 /*
  763  * Shutdown and remove the node and its associated interface.
  764  */
  765 static int
  766 ng_iface_shutdown(node_p node)
  767 {
  768         const priv_p priv = NG_NODE_PRIVATE(node);
  769 
  770         bpfdetach(priv->ifp);
  771         if_detach(priv->ifp);
  772         if_free(priv->ifp);
  773         priv->ifp = NULL;
  774         free_unr(ng_iface_unit, priv->unit);
  775         FREE(priv, M_NETGRAPH_IFACE);
  776         NG_NODE_SET_PRIVATE(node, NULL);
  777         NG_NODE_UNREF(node);
  778         return (0);
  779 }
  780 
  781 /*
  782  * Hook disconnection. Note that we do *not* shutdown when all
  783  * hooks have been disconnected.
  784  */
  785 static int
  786 ng_iface_disconnect(hook_p hook)
  787 {
  788         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  789         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  790 
  791         if (iffam == NULL)
  792                 panic(__func__);
  793         *get_hook_from_iffam(priv, iffam) = NULL;
  794         return (0);
  795 }
  796 
  797 /*
  798  * Handle loading and unloading for this node type.
  799  */
  800 static int
  801 ng_iface_mod_event(module_t mod, int event, void *data)
  802 {
  803         int error = 0;
  804 
  805         switch (event) {
  806         case MOD_LOAD:
  807                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  808                 break;
  809         case MOD_UNLOAD:
  810                 delete_unrhdr(ng_iface_unit);
  811                 break;
  812         default:
  813                 error = EOPNOTSUPP;
  814                 break;
  815         }
  816         return (error);
  817 }

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