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

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