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: releng/11.1/sys/netgraph/ng_iface.c 302054 2016-06-21 13:48:49Z bz $
   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, 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_inet.h"
   56 #include "opt_inet6.h"
   57 
   58 #include <sys/param.h>
   59 #include <sys/systm.h>
   60 #include <sys/errno.h>
   61 #include <sys/kernel.h>
   62 #include <sys/malloc.h>
   63 #include <sys/mbuf.h>
   64 #include <sys/errno.h>
   65 #include <sys/proc.h>
   66 #include <sys/random.h>
   67 #include <sys/sockio.h>
   68 #include <sys/socket.h>
   69 #include <sys/syslog.h>
   70 #include <sys/libkern.h>
   71 
   72 #include <net/if.h>
   73 #include <net/if_var.h>
   74 #include <net/if_types.h>
   75 #include <net/bpf.h>
   76 #include <net/netisr.h>
   77 #include <net/route.h>
   78 #include <net/vnet.h>
   79 
   80 #include <netinet/in.h>
   81 
   82 #include <netgraph/ng_message.h>
   83 #include <netgraph/netgraph.h>
   84 #include <netgraph/ng_parse.h>
   85 #include <netgraph/ng_iface.h>
   86 
   87 #ifdef NG_SEPARATE_MALLOC
   88 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
   89 #else
   90 #define M_NETGRAPH_IFACE M_NETGRAPH
   91 #endif
   92 
   93 /* This struct describes one address family */
   94 struct iffam {
   95         sa_family_t     family;         /* Address family */
   96         const char      *hookname;      /* Name for hook */
   97 };
   98 typedef const struct iffam *iffam_p;
   99 
  100 /* List of address families supported by our interface */
  101 const static struct iffam gFamilies[] = {
  102         { AF_INET,      NG_IFACE_HOOK_INET      },
  103         { AF_INET6,     NG_IFACE_HOOK_INET6     },
  104         { AF_ATM,       NG_IFACE_HOOK_ATM       },
  105         { AF_NATM,      NG_IFACE_HOOK_NATM      },
  106 };
  107 #define NUM_FAMILIES            nitems(gFamilies)
  108 
  109 /* Node private data */
  110 struct ng_iface_private {
  111         struct  ifnet *ifp;             /* Our interface */
  112         int     unit;                   /* Interface unit number */
  113         node_p  node;                   /* Our netgraph node */
  114         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
  115 };
  116 typedef struct ng_iface_private *priv_p;
  117 
  118 /* Interface methods */
  119 static void     ng_iface_start(struct ifnet *ifp);
  120 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  121 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
  122                         const struct sockaddr *dst, struct route *ro);
  123 static void     ng_iface_bpftap(struct ifnet *ifp,
  124                         struct mbuf *m, sa_family_t family);
  125 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
  126                         sa_family_t sa);
  127 #ifdef DEBUG
  128 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  129 #endif
  130 
  131 /* Netgraph methods */
  132 static int              ng_iface_mod_event(module_t, int, void *);
  133 static ng_constructor_t ng_iface_constructor;
  134 static ng_rcvmsg_t      ng_iface_rcvmsg;
  135 static ng_shutdown_t    ng_iface_shutdown;
  136 static ng_newhook_t     ng_iface_newhook;
  137 static ng_rcvdata_t     ng_iface_rcvdata;
  138 static ng_disconnect_t  ng_iface_disconnect;
  139 
  140 /* Helper stuff */
  141 static iffam_p  get_iffam_from_af(sa_family_t family);
  142 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  143 static iffam_p  get_iffam_from_name(const char *name);
  144 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  145 
  146 /* List of commands and how to convert arguments to/from ASCII */
  147 static const struct ng_cmdlist ng_iface_cmds[] = {
  148         {
  149           NGM_IFACE_COOKIE,
  150           NGM_IFACE_GET_IFNAME,
  151           "getifname",
  152           NULL,
  153           &ng_parse_string_type
  154         },
  155         {
  156           NGM_IFACE_COOKIE,
  157           NGM_IFACE_POINT2POINT,
  158           "point2point",
  159           NULL,
  160           NULL
  161         },
  162         {
  163           NGM_IFACE_COOKIE,
  164           NGM_IFACE_BROADCAST,
  165           "broadcast",
  166           NULL,
  167           NULL
  168         },
  169         {
  170           NGM_IFACE_COOKIE,
  171           NGM_IFACE_GET_IFINDEX,
  172           "getifindex",
  173           NULL,
  174           &ng_parse_uint32_type
  175         },
  176         { 0 }
  177 };
  178 
  179 /* Node type descriptor */
  180 static struct ng_type typestruct = {
  181         .version =      NG_ABI_VERSION,
  182         .name =         NG_IFACE_NODE_TYPE,
  183         .mod_event =    ng_iface_mod_event,
  184         .constructor =  ng_iface_constructor,
  185         .rcvmsg =       ng_iface_rcvmsg,
  186         .shutdown =     ng_iface_shutdown,
  187         .newhook =      ng_iface_newhook,
  188         .rcvdata =      ng_iface_rcvdata,
  189         .disconnect =   ng_iface_disconnect,
  190         .cmdlist =      ng_iface_cmds,
  191 };
  192 NETGRAPH_INIT(iface, &typestruct);
  193 
  194 static VNET_DEFINE(struct unrhdr *, ng_iface_unit);
  195 #define V_ng_iface_unit                 VNET(ng_iface_unit)
  196 
  197 /************************************************************************
  198                         HELPER STUFF
  199  ************************************************************************/
  200 
  201 /*
  202  * Get the family descriptor from the family ID
  203  */
  204 static __inline iffam_p
  205 get_iffam_from_af(sa_family_t family)
  206 {
  207         iffam_p iffam;
  208         int k;
  209 
  210         for (k = 0; k < NUM_FAMILIES; k++) {
  211                 iffam = &gFamilies[k];
  212                 if (iffam->family == family)
  213                         return (iffam);
  214         }
  215         return (NULL);
  216 }
  217 
  218 /*
  219  * Get the family descriptor from the hook
  220  */
  221 static __inline iffam_p
  222 get_iffam_from_hook(priv_p priv, hook_p hook)
  223 {
  224         int k;
  225 
  226         for (k = 0; k < NUM_FAMILIES; k++)
  227                 if (priv->hooks[k] == hook)
  228                         return (&gFamilies[k]);
  229         return (NULL);
  230 }
  231 
  232 /*
  233  * Get the hook from the iffam descriptor
  234  */
  235 
  236 static __inline hook_p *
  237 get_hook_from_iffam(priv_p priv, iffam_p iffam)
  238 {
  239         return (&priv->hooks[iffam - gFamilies]);
  240 }
  241 
  242 /*
  243  * Get the iffam descriptor from the name
  244  */
  245 static __inline iffam_p
  246 get_iffam_from_name(const char *name)
  247 {
  248         iffam_p iffam;
  249         int k;
  250 
  251         for (k = 0; k < NUM_FAMILIES; k++) {
  252                 iffam = &gFamilies[k];
  253                 if (!strcmp(iffam->hookname, name))
  254                         return (iffam);
  255         }
  256         return (NULL);
  257 }
  258 
  259 /************************************************************************
  260                         INTERFACE STUFF
  261  ************************************************************************/
  262 
  263 /*
  264  * Process an ioctl for the virtual interface
  265  */
  266 static int
  267 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  268 {
  269         struct ifreq *const ifr = (struct ifreq *) data;
  270         int error = 0;
  271 
  272 #ifdef DEBUG
  273         ng_iface_print_ioctl(ifp, command, data);
  274 #endif
  275         switch (command) {
  276 
  277         /* These two are mostly handled at a higher layer */
  278         case SIOCSIFADDR:
  279                 ifp->if_flags |= IFF_UP;
  280                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  281                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  282                 break;
  283         case SIOCGIFADDR:
  284                 break;
  285 
  286         /* Set flags */
  287         case SIOCSIFFLAGS:
  288                 /*
  289                  * If the interface is marked up and stopped, then start it.
  290                  * If it is marked down and running, then stop it.
  291                  */
  292                 if (ifr->ifr_flags & IFF_UP) {
  293                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  294                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  295                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  296                         }
  297                 } else {
  298                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  299                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  300                                     IFF_DRV_OACTIVE);
  301                 }
  302                 break;
  303 
  304         /* Set the interface MTU */
  305         case SIOCSIFMTU:
  306                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  307                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  308                         error = EINVAL;
  309                 else
  310                         ifp->if_mtu = ifr->ifr_mtu;
  311                 break;
  312 
  313         /* Stuff that's not supported */
  314         case SIOCADDMULTI:
  315         case SIOCDELMULTI:
  316                 error = 0;
  317                 break;
  318         case SIOCSIFPHYS:
  319                 error = EOPNOTSUPP;
  320                 break;
  321 
  322         default:
  323                 error = EINVAL;
  324                 break;
  325         }
  326         return (error);
  327 }
  328 
  329 /*
  330  * This routine is called to deliver a packet out the interface.
  331  * We simply look at the address family and relay the packet to
  332  * the corresponding hook, if it exists and is connected.
  333  */
  334 
  335 static int
  336 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  337         const struct sockaddr *dst, struct route *ro)
  338 {
  339         struct m_tag *mtag;
  340         uint32_t af;
  341         int error;
  342 
  343         /* Check interface flags */
  344         if (!((ifp->if_flags & IFF_UP) &&
  345             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  346                 m_freem(m);
  347                 return (ENETDOWN);
  348         }
  349 
  350         /* Protect from deadly infinite recursion. */
  351         mtag = NULL;
  352         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
  353                 if (*(struct ifnet **)(mtag + 1) == ifp) {
  354                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
  355                         m_freem(m);
  356                         return (EDEADLK);
  357                 }
  358         }
  359         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
  360             M_NOWAIT);
  361         if (mtag == NULL) {
  362                 m_freem(m);
  363                 return (ENOMEM);
  364         }
  365         *(struct ifnet **)(mtag + 1) = ifp;
  366         m_tag_prepend(m, mtag);
  367 
  368         /* BPF writes need to be handled specially. */
  369         if (dst->sa_family == AF_UNSPEC)
  370                 bcopy(dst->sa_data, &af, sizeof(af));
  371         else
  372                 af = dst->sa_family;
  373 
  374         /* Berkeley packet filter */
  375         ng_iface_bpftap(ifp, m, af);
  376 
  377         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  378                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
  379                 if (m == NULL) {
  380                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
  381                         return (ENOBUFS);
  382                 }
  383                 *(sa_family_t *)m->m_data = af;
  384                 error = (ifp->if_transmit)(ifp, m);
  385         } else
  386                 error = ng_iface_send(ifp, m, af);
  387 
  388         return (error);
  389 }
  390 
  391 /*
  392  * Start method is used only when ALTQ is enabled.
  393  */
  394 static void
  395 ng_iface_start(struct ifnet *ifp)
  396 {
  397         struct mbuf *m;
  398         sa_family_t sa;
  399 
  400         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  401 
  402         for(;;) {
  403                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  404                 if (m == NULL)
  405                         break;
  406                 sa = *mtod(m, sa_family_t *);
  407                 m_adj(m, sizeof(sa_family_t));
  408                 ng_iface_send(ifp, m, sa);
  409         }
  410 }
  411 
  412 /*
  413  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  414  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  415  */
  416 static void
  417 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  418 {
  419         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  420         if (bpf_peers_present(ifp->if_bpf)) {
  421                 int32_t family4 = (int32_t)family;
  422                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  423         }
  424 }
  425 
  426 /*
  427  * This routine does actual delivery of the packet into the
  428  * netgraph(4). It is called from ng_iface_start() and
  429  * ng_iface_output().
  430  */
  431 static int
  432 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  433 {
  434         const priv_p priv = (priv_p) ifp->if_softc;
  435         const iffam_p iffam = get_iffam_from_af(sa);
  436         int error;
  437         int len;
  438 
  439         /* Check address family to determine hook (if known) */
  440         if (iffam == NULL) {
  441                 m_freem(m);
  442                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  443                 return (EAFNOSUPPORT);
  444         }
  445 
  446         /* Copy length before the mbuf gets invalidated. */
  447         len = m->m_pkthdr.len;
  448 
  449         /* Send packet. If hook is not connected, mbuf will get freed. */
  450         NG_OUTBOUND_THREAD_REF();
  451         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
  452         NG_OUTBOUND_THREAD_UNREF();
  453 
  454         /* Update stats. */
  455         if (error == 0) {
  456                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
  457                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  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         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
  513         ifp = if_alloc(IFT_PROPVIRTUAL);
  514         if (ifp == NULL) {
  515                 free(priv, M_NETGRAPH_IFACE);
  516                 return (ENOMEM);
  517         }
  518 
  519         /* Link them together */
  520         ifp->if_softc = priv;
  521         priv->ifp = ifp;
  522 
  523         /* Get an interface unit number */
  524         priv->unit = alloc_unr(V_ng_iface_unit);
  525 
  526         /* Link together node and private info */
  527         NG_NODE_SET_PRIVATE(node, priv);
  528         priv->node = node;
  529 
  530         /* Initialize interface structure */
  531         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  532         ifp->if_output = ng_iface_output;
  533         ifp->if_start = ng_iface_start;
  534         ifp->if_ioctl = ng_iface_ioctl;
  535         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  536         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  537         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  538         ifp->if_addrlen = 0;                    /* XXX */
  539         ifp->if_hdrlen = 0;                     /* XXX */
  540         ifp->if_baudrate = 64000;               /* XXX */
  541         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  542         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  543         IFQ_SET_READY(&ifp->if_snd);
  544 
  545         /* Give this node the same name as the interface (if possible) */
  546         if (ng_name_node(node, ifp->if_xname) != 0)
  547                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  548                     ifp->if_xname);
  549 
  550         /* Attach the interface */
  551         if_attach(ifp);
  552         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  553 
  554         /* Done */
  555         return (0);
  556 }
  557 
  558 /*
  559  * Give our ok for a hook to be added
  560  */
  561 static int
  562 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  563 {
  564         const iffam_p iffam = get_iffam_from_name(name);
  565         hook_p *hookptr;
  566 
  567         if (iffam == NULL)
  568                 return (EPFNOSUPPORT);
  569         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  570         if (*hookptr != NULL)
  571                 return (EISCONN);
  572         *hookptr = hook;
  573         NG_HOOK_HI_STACK(hook);
  574         NG_HOOK_SET_TO_INBOUND(hook);
  575         return (0);
  576 }
  577 
  578 /*
  579  * Receive a control message
  580  */
  581 static int
  582 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  583 {
  584         const priv_p priv = NG_NODE_PRIVATE(node);
  585         struct ifnet *const ifp = priv->ifp;
  586         struct ng_mesg *resp = NULL;
  587         int error = 0;
  588         struct ng_mesg *msg;
  589 
  590         NGI_GET_MSG(item, msg);
  591         switch (msg->header.typecookie) {
  592         case NGM_IFACE_COOKIE:
  593                 switch (msg->header.cmd) {
  594                 case NGM_IFACE_GET_IFNAME:
  595                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  596                         if (resp == NULL) {
  597                                 error = ENOMEM;
  598                                 break;
  599                         }
  600                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  601                         break;
  602 
  603                 case NGM_IFACE_POINT2POINT:
  604                 case NGM_IFACE_BROADCAST:
  605                     {
  606 
  607                         /* Deny request if interface is UP */
  608                         if ((ifp->if_flags & IFF_UP) != 0)
  609                                 return (EBUSY);
  610 
  611                         /* Change flags */
  612                         switch (msg->header.cmd) {
  613                         case NGM_IFACE_POINT2POINT:
  614                                 ifp->if_flags |= IFF_POINTOPOINT;
  615                                 ifp->if_flags &= ~IFF_BROADCAST;
  616                                 break;
  617                         case NGM_IFACE_BROADCAST:
  618                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  619                                 ifp->if_flags |= IFF_BROADCAST;
  620                                 break;
  621                         }
  622                         break;
  623                     }
  624 
  625                 case NGM_IFACE_GET_IFINDEX:
  626                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  627                         if (resp == NULL) {
  628                                 error = ENOMEM;
  629                                 break;
  630                         }
  631                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  632                         break;
  633 
  634                 default:
  635                         error = EINVAL;
  636                         break;
  637                 }
  638                 break;
  639         case NGM_FLOW_COOKIE:
  640                 switch (msg->header.cmd) {
  641                 case NGM_LINK_IS_UP:
  642                         if_link_state_change(ifp, LINK_STATE_UP);
  643                         break;
  644                 case NGM_LINK_IS_DOWN:
  645                         if_link_state_change(ifp, LINK_STATE_DOWN);
  646                         break;
  647                 default:
  648                         break;
  649                 }
  650                 break;
  651         default:
  652                 error = EINVAL;
  653                 break;
  654         }
  655         NG_RESPOND_MSG(error, node, item, resp);
  656         NG_FREE_MSG(msg);
  657         return (error);
  658 }
  659 
  660 /*
  661  * Recive data from a hook. Pass the packet to the correct input routine.
  662  */
  663 static int
  664 ng_iface_rcvdata(hook_p hook, item_p item)
  665 {
  666         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  667         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  668         struct ifnet *const ifp = priv->ifp;
  669         struct mbuf *m;
  670         int isr;
  671 
  672         NGI_GET_M(item, m);
  673         NG_FREE_ITEM(item);
  674         /* Sanity checks */
  675         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  676         M_ASSERTPKTHDR(m);
  677         if ((ifp->if_flags & IFF_UP) == 0) {
  678                 NG_FREE_M(m);
  679                 return (ENETDOWN);
  680         }
  681 
  682         /* Update interface stats */
  683         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  684         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  685 
  686         /* Note receiving interface */
  687         m->m_pkthdr.rcvif = ifp;
  688 
  689         /* Berkeley packet filter */
  690         ng_iface_bpftap(ifp, m, iffam->family);
  691 
  692         /* Send packet */
  693         switch (iffam->family) {
  694 #ifdef INET
  695         case AF_INET:
  696                 isr = NETISR_IP;
  697                 break;
  698 #endif
  699 #ifdef INET6
  700         case AF_INET6:
  701                 isr = NETISR_IPV6;
  702                 break;
  703 #endif
  704         default:
  705                 m_freem(m);
  706                 return (EAFNOSUPPORT);
  707         }
  708         random_harvest_queue(m, sizeof(*m), 2, RANDOM_NET_NG);
  709         M_SETFIB(m, ifp->if_fib);
  710         netisr_dispatch(isr, m);
  711         return (0);
  712 }
  713 
  714 /*
  715  * Shutdown and remove the node and its associated interface.
  716  */
  717 static int
  718 ng_iface_shutdown(node_p node)
  719 {
  720         const priv_p priv = NG_NODE_PRIVATE(node);
  721 
  722         /*
  723          * The ifnet may be in a different vnet than the netgraph node, 
  724          * hence we have to change the current vnet context here.
  725          */
  726         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  727         bpfdetach(priv->ifp);
  728         if_detach(priv->ifp);
  729         if_free(priv->ifp);
  730         CURVNET_RESTORE();
  731         priv->ifp = NULL;
  732         free_unr(V_ng_iface_unit, priv->unit);
  733         free(priv, M_NETGRAPH_IFACE);
  734         NG_NODE_SET_PRIVATE(node, NULL);
  735         NG_NODE_UNREF(node);
  736         return (0);
  737 }
  738 
  739 /*
  740  * Hook disconnection. Note that we do *not* shutdown when all
  741  * hooks have been disconnected.
  742  */
  743 static int
  744 ng_iface_disconnect(hook_p hook)
  745 {
  746         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  747         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  748 
  749         if (iffam == NULL)
  750                 panic("%s", __func__);
  751         *get_hook_from_iffam(priv, iffam) = NULL;
  752         return (0);
  753 }
  754 
  755 /*
  756  * Handle loading and unloading for this node type.
  757  */
  758 static int
  759 ng_iface_mod_event(module_t mod, int event, void *data)
  760 {
  761         int error = 0;
  762 
  763         switch (event) {
  764         case MOD_LOAD:
  765         case MOD_UNLOAD:
  766                 break;
  767         default:
  768                 error = EOPNOTSUPP;
  769                 break;
  770         }
  771         return (error);
  772 }
  773 
  774 static void
  775 vnet_ng_iface_init(const void *unused)
  776 {
  777 
  778         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  779 }
  780 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  781     vnet_ng_iface_init, NULL);
  782 
  783 static void
  784 vnet_ng_iface_uninit(const void *unused)
  785 {
  786 
  787         delete_unrhdr(V_ng_iface_unit);
  788 }
  789 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  790     vnet_ng_iface_uninit, NULL);

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