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/7.3/sys/netgraph/ng_iface.c 195336 2009-07-04 06:00:57Z mav $
   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         struct m_tag *mtag;
  357         uint32_t af;
  358         int error;
  359 
  360         /* Check interface flags */
  361         if (!((ifp->if_flags & IFF_UP) &&
  362             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  363                 m_freem(m);
  364                 return (ENETDOWN);
  365         }
  366 
  367         /* Protect from deadly infinite recursion. */
  368         mtag = NULL;
  369         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
  370                 if (*(struct ifnet **)(mtag + 1) == ifp) {
  371                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
  372                         m_freem(m);
  373                         return (EDEADLK);
  374                 }
  375         }
  376         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
  377             M_NOWAIT);
  378         if (mtag == NULL) {
  379                 m_freem(m);
  380                 return (ENOMEM);
  381         }
  382         *(struct ifnet **)(mtag + 1) = ifp;
  383         m_tag_prepend(m, mtag);
  384 
  385         /* BPF writes need to be handled specially. */
  386         if (dst->sa_family == AF_UNSPEC) {
  387                 bcopy(dst->sa_data, &af, sizeof(af));
  388                 dst->sa_family = af;
  389         }
  390 
  391         /* Berkeley packet filter */
  392         ng_iface_bpftap(ifp, m, dst->sa_family);
  393 
  394         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  395                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
  396                 if (m == NULL) {
  397                         IFQ_LOCK(&ifp->if_snd);
  398                         IFQ_INC_DROPS(&ifp->if_snd);
  399                         IFQ_UNLOCK(&ifp->if_snd);
  400                         ifp->if_oerrors++;
  401                         return (ENOBUFS);
  402                 }
  403                 *(sa_family_t *)m->m_data = dst->sa_family;
  404                 IFQ_HANDOFF(ifp, m, error);
  405         } else
  406                 error = ng_iface_send(ifp, m, dst->sa_family);
  407 
  408         return (error);
  409 }
  410 
  411 /*
  412  * Start method is used only when ALTQ is enabled.
  413  */
  414 static void
  415 ng_iface_start(struct ifnet *ifp)
  416 {
  417         struct mbuf *m;
  418         sa_family_t sa;
  419 
  420         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  421 
  422         for(;;) {
  423                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  424                 if (m == NULL)
  425                         break;
  426                 sa = *mtod(m, sa_family_t *);
  427                 m_adj(m, sizeof(sa_family_t));
  428                 ng_iface_send(ifp, m, sa);
  429         }
  430 }
  431 
  432 /*
  433  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  434  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  435  */
  436 static void
  437 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  438 {
  439         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  440         if (bpf_peers_present(ifp->if_bpf)) {
  441                 int32_t family4 = (int32_t)family;
  442                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  443         }
  444 }
  445 
  446 /*
  447  * This routine does actual delivery of the packet into the
  448  * netgraph(4). It is called from ng_iface_start() and
  449  * ng_iface_output().
  450  */
  451 static int
  452 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  453 {
  454         const priv_p priv = (priv_p) ifp->if_softc;
  455         const iffam_p iffam = get_iffam_from_af(sa);
  456         int error;
  457         int len;
  458 
  459         /* Check address family to determine hook (if known) */
  460         if (iffam == NULL) {
  461                 m_freem(m);
  462                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  463                 return (EAFNOSUPPORT);
  464         }
  465 
  466         /* Copy length before the mbuf gets invalidated. */
  467         len = m->m_pkthdr.len;
  468 
  469         /* Send packet. If hook is not connected,
  470            mbuf will get freed. */
  471         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
  472 
  473         /* Update stats. */
  474         if (error == 0) {
  475                 ifp->if_obytes += len;
  476                 ifp->if_opackets++;
  477         }
  478 
  479         return (error);
  480 }
  481 
  482 #ifdef DEBUG
  483 /*
  484  * Display an ioctl to the virtual interface
  485  */
  486 
  487 static void
  488 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  489 {
  490         char   *str;
  491 
  492         switch (command & IOC_DIRMASK) {
  493         case IOC_VOID:
  494                 str = "IO";
  495                 break;
  496         case IOC_OUT:
  497                 str = "IOR";
  498                 break;
  499         case IOC_IN:
  500                 str = "IOW";
  501                 break;
  502         case IOC_INOUT:
  503                 str = "IORW";
  504                 break;
  505         default:
  506                 str = "IO??";
  507         }
  508         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  509                ifp->if_xname,
  510                str,
  511                IOCGROUP(command),
  512                command & 0xff,
  513                IOCPARM_LEN(command));
  514 }
  515 #endif /* DEBUG */
  516 
  517 /************************************************************************
  518                         NETGRAPH NODE STUFF
  519  ************************************************************************/
  520 
  521 /*
  522  * Constructor for a node
  523  */
  524 static int
  525 ng_iface_constructor(node_p node)
  526 {
  527         struct ifnet *ifp;
  528         priv_p priv;
  529 
  530         /* Allocate node and interface private structures */
  531         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
  532         if (priv == NULL)
  533                 return (ENOMEM);
  534         ifp = if_alloc(IFT_PROPVIRTUAL);
  535         if (ifp == NULL) {
  536                 FREE(priv, M_NETGRAPH_IFACE);
  537                 return (ENOMEM);
  538         }
  539 
  540         /* Link them together */
  541         ifp->if_softc = priv;
  542         priv->ifp = ifp;
  543 
  544         /* Get an interface unit number */
  545         priv->unit = alloc_unr(ng_iface_unit);
  546 
  547         /* Link together node and private info */
  548         NG_NODE_SET_PRIVATE(node, priv);
  549         priv->node = node;
  550 
  551         /* Initialize interface structure */
  552         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  553         ifp->if_output = ng_iface_output;
  554         ifp->if_start = ng_iface_start;
  555         ifp->if_ioctl = ng_iface_ioctl;
  556         ifp->if_watchdog = NULL;
  557         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  558         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  559         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  560         ifp->if_addrlen = 0;                    /* XXX */
  561         ifp->if_hdrlen = 0;                     /* XXX */
  562         ifp->if_baudrate = 64000;               /* XXX */
  563         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
  564         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
  565         IFQ_SET_READY(&ifp->if_snd);
  566 
  567         /* Give this node the same name as the interface (if possible) */
  568         if (ng_name_node(node, ifp->if_xname) != 0)
  569                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  570                     ifp->if_xname);
  571 
  572         /* Attach the interface */
  573         if_attach(ifp);
  574         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  575 
  576         /* Done */
  577         return (0);
  578 }
  579 
  580 /*
  581  * Give our ok for a hook to be added
  582  */
  583 static int
  584 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  585 {
  586         const iffam_p iffam = get_iffam_from_name(name);
  587         hook_p *hookptr;
  588 
  589         if (iffam == NULL)
  590                 return (EPFNOSUPPORT);
  591         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  592         if (*hookptr != NULL)
  593                 return (EISCONN);
  594         *hookptr = hook;
  595         NG_HOOK_HI_STACK(hook);
  596         return (0);
  597 }
  598 
  599 /*
  600  * Receive a control message
  601  */
  602 static int
  603 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  604 {
  605         const priv_p priv = NG_NODE_PRIVATE(node);
  606         struct ifnet *const ifp = priv->ifp;
  607         struct ng_mesg *resp = NULL;
  608         int error = 0;
  609         struct ng_mesg *msg;
  610 
  611         NGI_GET_MSG(item, msg);
  612         switch (msg->header.typecookie) {
  613         case NGM_IFACE_COOKIE:
  614                 switch (msg->header.cmd) {
  615                 case NGM_IFACE_GET_IFNAME:
  616                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  617                         if (resp == NULL) {
  618                                 error = ENOMEM;
  619                                 break;
  620                         }
  621                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  622                         break;
  623 
  624                 case NGM_IFACE_POINT2POINT:
  625                 case NGM_IFACE_BROADCAST:
  626                     {
  627 
  628                         /* Deny request if interface is UP */
  629                         if ((ifp->if_flags & IFF_UP) != 0)
  630                                 return (EBUSY);
  631 
  632                         /* Change flags */
  633                         switch (msg->header.cmd) {
  634                         case NGM_IFACE_POINT2POINT:
  635                                 ifp->if_flags |= IFF_POINTOPOINT;
  636                                 ifp->if_flags &= ~IFF_BROADCAST;
  637                                 break;
  638                         case NGM_IFACE_BROADCAST:
  639                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  640                                 ifp->if_flags |= IFF_BROADCAST;
  641                                 break;
  642                         }
  643                         break;
  644                     }
  645 
  646                 case NGM_IFACE_GET_IFINDEX:
  647                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  648                         if (resp == NULL) {
  649                                 error = ENOMEM;
  650                                 break;
  651                         }
  652                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  653                         break;
  654 
  655                 default:
  656                         error = EINVAL;
  657                         break;
  658                 }
  659                 break;
  660         case NGM_CISCO_COOKIE:
  661                 switch (msg->header.cmd) {
  662                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
  663                     {
  664                         struct ifaddr *ifa;
  665 
  666                         /* Return the first configured IP address */
  667                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  668                                 struct ng_cisco_ipaddr *ips;
  669 
  670                                 if (ifa->ifa_addr->sa_family != AF_INET)
  671                                         continue;
  672                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
  673                                 if (resp == NULL) {
  674                                         error = ENOMEM;
  675                                         break;
  676                                 }
  677                                 ips = (struct ng_cisco_ipaddr *)resp->data;
  678                                 ips->ipaddr = ((struct sockaddr_in *)
  679                                                 ifa->ifa_addr)->sin_addr;
  680                                 ips->netmask = ((struct sockaddr_in *)
  681                                                 ifa->ifa_netmask)->sin_addr;
  682                                 break;
  683                         }
  684 
  685                         /* No IP addresses on this interface? */
  686                         if (ifa == NULL)
  687                                 error = EADDRNOTAVAIL;
  688                         break;
  689                     }
  690                 default:
  691                         error = EINVAL;
  692                         break;
  693                 }
  694                 break;
  695         case NGM_FLOW_COOKIE:
  696                 switch (msg->header.cmd) {
  697                 case NGM_LINK_IS_UP:
  698                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  699                         break;
  700                 case NGM_LINK_IS_DOWN:
  701                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  702                         break;
  703                 default:
  704                         break;
  705                 }
  706                 break;
  707         default:
  708                 error = EINVAL;
  709                 break;
  710         }
  711         NG_RESPOND_MSG(error, node, item, resp);
  712         NG_FREE_MSG(msg);
  713         return (error);
  714 }
  715 
  716 /*
  717  * Recive data from a hook. Pass the packet to the correct input routine.
  718  */
  719 static int
  720 ng_iface_rcvdata(hook_p hook, item_p item)
  721 {
  722         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  723         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  724         struct ifnet *const ifp = priv->ifp;
  725         struct mbuf *m;
  726         int isr;
  727 
  728         NGI_GET_M(item, m);
  729         NG_FREE_ITEM(item);
  730         /* Sanity checks */
  731         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  732         M_ASSERTPKTHDR(m);
  733         if ((ifp->if_flags & IFF_UP) == 0) {
  734                 NG_FREE_M(m);
  735                 return (ENETDOWN);
  736         }
  737 
  738         /* Update interface stats */
  739         ifp->if_ipackets++;
  740         ifp->if_ibytes += m->m_pkthdr.len;
  741 
  742         /* Note receiving interface */
  743         m->m_pkthdr.rcvif = ifp;
  744 
  745         /* Berkeley packet filter */
  746         ng_iface_bpftap(ifp, m, iffam->family);
  747 
  748         /* Send packet */
  749         switch (iffam->family) {
  750 #ifdef INET
  751         case AF_INET:
  752                 isr = NETISR_IP;
  753                 break;
  754 #endif
  755 #ifdef INET6
  756         case AF_INET6:
  757                 isr = NETISR_IPV6;
  758                 break;
  759 #endif
  760 #ifdef IPX
  761         case AF_IPX:
  762                 isr = NETISR_IPX;
  763                 break;
  764 #endif
  765 #ifdef NETATALK
  766         case AF_APPLETALK:
  767                 isr = NETISR_ATALK2;
  768                 break;
  769 #endif
  770         default:
  771                 m_freem(m);
  772                 return (EAFNOSUPPORT);
  773         }
  774         /* First chunk of an mbuf contains good junk */
  775         if (harvest.point_to_point)
  776                 random_harvest(m, 16, 3, 0, RANDOM_NET);
  777         netisr_dispatch(isr, m);
  778         return (0);
  779 }
  780 
  781 /*
  782  * Shutdown and remove the node and its associated interface.
  783  */
  784 static int
  785 ng_iface_shutdown(node_p node)
  786 {
  787         const priv_p priv = NG_NODE_PRIVATE(node);
  788 
  789         bpfdetach(priv->ifp);
  790         if_detach(priv->ifp);
  791         if_free(priv->ifp);
  792         priv->ifp = NULL;
  793         free_unr(ng_iface_unit, priv->unit);
  794         FREE(priv, M_NETGRAPH_IFACE);
  795         NG_NODE_SET_PRIVATE(node, NULL);
  796         NG_NODE_UNREF(node);
  797         return (0);
  798 }
  799 
  800 /*
  801  * Hook disconnection. Note that we do *not* shutdown when all
  802  * hooks have been disconnected.
  803  */
  804 static int
  805 ng_iface_disconnect(hook_p hook)
  806 {
  807         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  808         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  809 
  810         if (iffam == NULL)
  811                 panic(__func__);
  812         *get_hook_from_iffam(priv, iffam) = NULL;
  813         return (0);
  814 }
  815 
  816 /*
  817  * Handle loading and unloading for this node type.
  818  */
  819 static int
  820 ng_iface_mod_event(module_t mod, int event, void *data)
  821 {
  822         int error = 0;
  823 
  824         switch (event) {
  825         case MOD_LOAD:
  826                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  827                 break;
  828         case MOD_UNLOAD:
  829                 delete_unrhdr(ng_iface_unit);
  830                 break;
  831         default:
  832                 error = EOPNOTSUPP;
  833                 break;
  834         }
  835         return (error);
  836 }

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