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 /*
    3  * ng_iface.c
    4  *
    5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    6  * All rights reserved.
    7  * 
    8  * Subject to the following obligations and disclaimer of warranty, use and
    9  * redistribution of this software, in source or object code forms, with or
   10  * without modifications are expressly permitted by Whistle Communications;
   11  * provided, however, that:
   12  * 1. Any and all reproductions of the source or object code must include the
   13  *    copyright notice above and the following disclaimer of warranties; and
   14  * 2. No rights are granted, in any manner or form, to use Whistle
   15  *    Communications, Inc. trademarks, including the mark "WHISTLE
   16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   17  *    such appears in the above copyright notice or in the software.
   18  * 
   19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   35  * OF SUCH DAMAGE.
   36  *
   37  * Author: Archie Cobbs <archie@freebsd.org>
   38  *
   39  * $FreeBSD: releng/5.0/sys/netgraph/ng_iface.c 106933 2002-11-14 23:44:37Z sam $
   40  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 /*
   44  * This node is also a system networking interface. It has
   45  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
   46  * are simply relayed between the interface and the hooks.
   47  *
   48  * Interfaces are named ng0, ng1, etc.  New nodes take the
   49  * first available interface name.
   50  *
   51  * This node also includes Berkeley packet filter support.
   52  */
   53 
   54 #include <sys/param.h>
   55 #include <sys/systm.h>
   56 #include <sys/errno.h>
   57 #include <sys/kernel.h>
   58 #include <sys/malloc.h>
   59 #include <sys/mbuf.h>
   60 #include <sys/errno.h>
   61 #include <sys/sockio.h>
   62 #include <sys/socket.h>
   63 #include <sys/syslog.h>
   64 #include <sys/libkern.h>
   65 
   66 #include <net/if.h>
   67 #include <net/if_types.h>
   68 #include <net/intrq.h>
   69 #include <net/bpf.h>
   70 
   71 #include <netinet/in.h>
   72 
   73 #include <netgraph/ng_message.h>
   74 #include <netgraph/netgraph.h>
   75 #include <netgraph/ng_parse.h>
   76 #include <netgraph/ng_iface.h>
   77 #include <netgraph/ng_cisco.h>
   78 
   79 #ifdef NG_SEPARATE_MALLOC
   80 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
   81 #else
   82 #define M_NETGRAPH_IFACE M_NETGRAPH
   83 #endif
   84 
   85 /* This struct describes one address family */
   86 struct iffam {
   87         sa_family_t     family;         /* Address family */
   88         const char      *hookname;      /* Name for hook */
   89 };
   90 typedef const struct iffam *iffam_p;
   91 
   92 /* List of address families supported by our interface */
   93 const static struct iffam gFamilies[] = {
   94         { AF_INET,      NG_IFACE_HOOK_INET      },
   95         { AF_INET6,     NG_IFACE_HOOK_INET6     },
   96         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
   97         { AF_IPX,       NG_IFACE_HOOK_IPX       },
   98         { AF_ATM,       NG_IFACE_HOOK_ATM       },
   99         { AF_NATM,      NG_IFACE_HOOK_NATM      },
  100         { AF_NS,        NG_IFACE_HOOK_NS        },
  101 };
  102 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
  103 
  104 /* Node private data */
  105 struct ng_iface_private {
  106         struct  ifnet *ifp;             /* Our interface */
  107         int     unit;                   /* Interface unit number */
  108         node_p  node;                   /* Our netgraph node */
  109         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
  110 };
  111 typedef struct ng_iface_private *priv_p;
  112 
  113 /* Interface methods */
  114 static void     ng_iface_start(struct ifnet *ifp);
  115 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  116 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
  117                         struct sockaddr *dst, struct rtentry *rt0);
  118 static void     ng_iface_bpftap(struct ifnet *ifp,
  119                         struct mbuf *m, sa_family_t family);
  120 #ifdef DEBUG
  121 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  122 #endif
  123 
  124 /* Netgraph methods */
  125 static ng_constructor_t ng_iface_constructor;
  126 static ng_rcvmsg_t      ng_iface_rcvmsg;
  127 static ng_shutdown_t    ng_iface_shutdown;
  128 static ng_newhook_t     ng_iface_newhook;
  129 static ng_rcvdata_t     ng_iface_rcvdata;
  130 static ng_disconnect_t  ng_iface_disconnect;
  131 
  132 /* Helper stuff */
  133 static iffam_p  get_iffam_from_af(sa_family_t family);
  134 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  135 static iffam_p  get_iffam_from_name(const char *name);
  136 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  137 
  138 /* Parse type for struct ng_iface_ifname */
  139 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = {
  140         NG_IFACE_IFACE_NAME_MAX + 1
  141 };
  142 static const struct ng_parse_type ng_iface_ifname_type = {
  143         &ng_parse_fixedstring_type,
  144         &ng_iface_ifname_info
  145 };
  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_iface_ifname_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         { 0 }
  186 };
  187 
  188 /* Node type descriptor */
  189 static struct ng_type typestruct = {
  190         NG_ABI_VERSION,
  191         NG_IFACE_NODE_TYPE,
  192         NULL,
  193         ng_iface_constructor,
  194         ng_iface_rcvmsg,
  195         ng_iface_shutdown,
  196         ng_iface_newhook,
  197         NULL,
  198         NULL,
  199         ng_iface_rcvdata,
  200         ng_iface_disconnect,
  201         ng_iface_cmds
  202 };
  203 NETGRAPH_INIT(iface, &typestruct);
  204 
  205 /* We keep a bitmap indicating which unit numbers are free.
  206    One means the unit number is free, zero means it's taken. */
  207 static int      *ng_iface_units = NULL;
  208 static int      ng_iface_units_len = 0;
  209 static int      ng_units_in_use = 0;
  210 
  211 #define UNITS_BITSPERWORD       (sizeof(*ng_iface_units) * NBBY)
  212 
  213 /************************************************************************
  214                         HELPER STUFF
  215  ************************************************************************/
  216 
  217 /*
  218  * Get the family descriptor from the family ID
  219  */
  220 static __inline__ iffam_p
  221 get_iffam_from_af(sa_family_t family)
  222 {
  223         iffam_p iffam;
  224         int k;
  225 
  226         for (k = 0; k < NUM_FAMILIES; k++) {
  227                 iffam = &gFamilies[k];
  228                 if (iffam->family == family)
  229                         return (iffam);
  230         }
  231         return (NULL);
  232 }
  233 
  234 /*
  235  * Get the family descriptor from the hook
  236  */
  237 static __inline__ iffam_p
  238 get_iffam_from_hook(priv_p priv, hook_p hook)
  239 {
  240         int k;
  241 
  242         for (k = 0; k < NUM_FAMILIES; k++)
  243                 if (priv->hooks[k] == hook)
  244                         return (&gFamilies[k]);
  245         return (NULL);
  246 }
  247 
  248 /*
  249  * Get the hook from the iffam descriptor
  250  */
  251 
  252 static __inline__ hook_p *
  253 get_hook_from_iffam(priv_p priv, iffam_p iffam)
  254 {
  255         return (&priv->hooks[iffam - gFamilies]);
  256 }
  257 
  258 /*
  259  * Get the iffam descriptor from the name
  260  */
  261 static __inline__ iffam_p
  262 get_iffam_from_name(const char *name)
  263 {
  264         iffam_p iffam;
  265         int k;
  266 
  267         for (k = 0; k < NUM_FAMILIES; k++) {
  268                 iffam = &gFamilies[k];
  269                 if (!strcmp(iffam->hookname, name))
  270                         return (iffam);
  271         }
  272         return (NULL);
  273 }
  274 
  275 /*
  276  * Find the first free unit number for a new interface.
  277  * Increase the size of the unit bitmap as necessary.
  278  */
  279 static __inline__ int
  280 ng_iface_get_unit(int *unit)
  281 {
  282         int index, bit;
  283 
  284         for (index = 0; index < ng_iface_units_len
  285             && ng_iface_units[index] == 0; index++);
  286         if (index == ng_iface_units_len) {              /* extend array */
  287                 int i, *newarray, newlen;
  288 
  289                 newlen = (2 * ng_iface_units_len) + 4;
  290                 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units),
  291                     M_NETGRAPH_IFACE, M_NOWAIT);
  292                 if (newarray == NULL)
  293                         return (ENOMEM);
  294                 bcopy(ng_iface_units, newarray,
  295                     ng_iface_units_len * sizeof(*ng_iface_units));
  296                 for (i = ng_iface_units_len; i < newlen; i++)
  297                         newarray[i] = ~0;
  298                 if (ng_iface_units != NULL)
  299                         FREE(ng_iface_units, M_NETGRAPH_IFACE);
  300                 ng_iface_units = newarray;
  301                 ng_iface_units_len = newlen;
  302         }
  303         bit = ffs(ng_iface_units[index]) - 1;
  304         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  305             ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit));
  306         ng_iface_units[index] &= ~(1 << bit);
  307         *unit = (index * UNITS_BITSPERWORD) + bit;
  308         ng_units_in_use++;
  309         return (0);
  310 }
  311 
  312 /*
  313  * Free a no longer needed unit number.
  314  */
  315 static __inline__ void
  316 ng_iface_free_unit(int unit)
  317 {
  318         int index, bit;
  319 
  320         index = unit / UNITS_BITSPERWORD;
  321         bit = unit % UNITS_BITSPERWORD;
  322         KASSERT(index < ng_iface_units_len,
  323             ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len));
  324         KASSERT((ng_iface_units[index] & (1 << bit)) == 0,
  325             ("%s: unit=%d is free", __func__, unit));
  326         ng_iface_units[index] |= (1 << bit);
  327         /*
  328          * XXX We could think about reducing the size of ng_iface_units[]
  329          * XXX here if the last portion is all ones
  330          * XXX At least free it if no more units.
  331          * Needed if we are to eventually be able to unload.
  332          */
  333         ng_units_in_use--;
  334         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  335                 FREE(ng_iface_units, M_NETGRAPH_IFACE);
  336                 ng_iface_units_len = 0;
  337                 ng_iface_units = NULL;
  338         }
  339 }
  340 
  341 /************************************************************************
  342                         INTERFACE STUFF
  343  ************************************************************************/
  344 
  345 /*
  346  * Process an ioctl for the virtual interface
  347  */
  348 static int
  349 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  350 {
  351         struct ifreq *const ifr = (struct ifreq *) data;
  352         int s, error = 0;
  353 
  354 #ifdef DEBUG
  355         ng_iface_print_ioctl(ifp, command, data);
  356 #endif
  357         s = splimp();
  358         switch (command) {
  359 
  360         /* These two are mostly handled at a higher layer */
  361         case SIOCSIFADDR:
  362                 ifp->if_flags |= (IFF_UP | IFF_RUNNING);
  363                 ifp->if_flags &= ~(IFF_OACTIVE);
  364                 break;
  365         case SIOCGIFADDR:
  366                 break;
  367 
  368         /* Set flags */
  369         case SIOCSIFFLAGS:
  370                 /*
  371                  * If the interface is marked up and stopped, then start it.
  372                  * If it is marked down and running, then stop it.
  373                  */
  374                 if (ifr->ifr_flags & IFF_UP) {
  375                         if (!(ifp->if_flags & IFF_RUNNING)) {
  376                                 ifp->if_flags &= ~(IFF_OACTIVE);
  377                                 ifp->if_flags |= IFF_RUNNING;
  378                         }
  379                 } else {
  380                         if (ifp->if_flags & IFF_RUNNING)
  381                                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  382                 }
  383                 break;
  384 
  385         /* Set the interface MTU */
  386         case SIOCSIFMTU:
  387                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  388                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  389                         error = EINVAL;
  390                 else
  391                         ifp->if_mtu = ifr->ifr_mtu;
  392                 break;
  393 
  394         /* Stuff that's not supported */
  395         case SIOCADDMULTI:
  396         case SIOCDELMULTI:
  397                 error = 0;
  398                 break;
  399         case SIOCSIFPHYS:
  400                 error = EOPNOTSUPP;
  401                 break;
  402 
  403         default:
  404                 error = EINVAL;
  405                 break;
  406         }
  407         (void) splx(s);
  408         return (error);
  409 }
  410 
  411 /*
  412  * This routine is called to deliver a packet out the interface.
  413  * We simply look at the address family and relay the packet to
  414  * the corresponding hook, if it exists and is connected.
  415  */
  416 
  417 static int
  418 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  419                 struct sockaddr *dst, struct rtentry *rt0)
  420 {
  421         const priv_p priv = (priv_p) ifp->if_softc;
  422         const iffam_p iffam = get_iffam_from_af(dst->sa_family);
  423         meta_p meta = NULL;
  424         int len, error = 0;
  425 
  426         /* Check interface flags */
  427         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
  428                 m_freem(m);
  429                 return (ENETDOWN);
  430         }
  431 
  432         /* BPF writes need to be handled specially */
  433         if (dst->sa_family == AF_UNSPEC) {
  434                 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
  435                         return (ENOBUFS);
  436                 dst->sa_family = (sa_family_t)*mtod(m, int32_t *);
  437                 m->m_data += 4;
  438                 m->m_len -= 4;
  439                 m->m_pkthdr.len -= 4;
  440         }
  441 
  442         /* Berkeley packet filter */
  443         ng_iface_bpftap(ifp, m, dst->sa_family);
  444 
  445         /* Check address family to determine hook (if known) */
  446         if (iffam == NULL) {
  447                 m_freem(m);
  448                 log(LOG_WARNING, "%s%d: can't handle af%d\n",
  449                        ifp->if_name, ifp->if_unit, (int)dst->sa_family);
  450                 return (EAFNOSUPPORT);
  451         }
  452 
  453         /* Copy length before the mbuf gets invalidated */
  454         len = m->m_pkthdr.len;
  455 
  456         /* Send packet; if hook is not connected, mbuf will get freed. */
  457         NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta);
  458 
  459         /* Update stats */
  460         if (error == 0) {
  461                 ifp->if_obytes += len;
  462                 ifp->if_opackets++;
  463         }
  464         return (error);
  465 }
  466 
  467 /*
  468  * This routine should never be called
  469  */
  470 
  471 static void
  472 ng_iface_start(struct ifnet *ifp)
  473 {
  474         if_printf(ifp, "%s called?", __func__);
  475 }
  476 
  477 /*
  478  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  479  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  480  */
  481 static void
  482 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  483 {
  484         int32_t family4 = (int32_t)family;
  485         struct mbuf m0;
  486 
  487         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  488         if (ifp->if_bpf != NULL) {
  489                 bzero(&m0, sizeof(m0));
  490                 m0.m_next = m;
  491                 m0.m_len = sizeof(family4);
  492                 m0.m_data = (char *)&family4;
  493                 BPF_MTAP(ifp, &m0);
  494         }
  495 }
  496 
  497 #ifdef DEBUG
  498 /*
  499  * Display an ioctl to the virtual interface
  500  */
  501 
  502 static void
  503 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  504 {
  505         char   *str;
  506 
  507         switch (command & IOC_DIRMASK) {
  508         case IOC_VOID:
  509                 str = "IO";
  510                 break;
  511         case IOC_OUT:
  512                 str = "IOR";
  513                 break;
  514         case IOC_IN:
  515                 str = "IOW";
  516                 break;
  517         case IOC_INOUT:
  518                 str = "IORW";
  519                 break;
  520         default:
  521                 str = "IO??";
  522         }
  523         log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
  524                ifp->if_name, ifp->if_unit,
  525                str,
  526                IOCGROUP(command),
  527                command & 0xff,
  528                IOCPARM_LEN(command));
  529 }
  530 #endif /* DEBUG */
  531 
  532 /************************************************************************
  533                         NETGRAPH NODE STUFF
  534  ************************************************************************/
  535 
  536 /*
  537  * Constructor for a node
  538  */
  539 static int
  540 ng_iface_constructor(node_p node)
  541 {
  542         char ifname[NG_IFACE_IFACE_NAME_MAX + 1];
  543         struct ifnet *ifp;
  544         priv_p priv;
  545         int error = 0;
  546 
  547         /* Allocate node and interface private structures */
  548         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
  549         if (priv == NULL)
  550                 return (ENOMEM);
  551         MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
  552         if (ifp == NULL) {
  553                 FREE(priv, M_NETGRAPH_IFACE);
  554                 return (ENOMEM);
  555         }
  556 
  557         /* Link them together */
  558         ifp->if_softc = priv;
  559         priv->ifp = ifp;
  560 
  561         /* Get an interface unit number */
  562         if ((error = ng_iface_get_unit(&priv->unit)) != 0) {
  563                 FREE(ifp, M_NETGRAPH_IFACE);
  564                 FREE(priv, M_NETGRAPH_IFACE);
  565                 return (error);
  566         }
  567 
  568         /* Link together node and private info */
  569         NG_NODE_SET_PRIVATE(node, priv);
  570         priv->node = node;
  571 
  572         /* Initialize interface structure */
  573         ifp->if_name = NG_IFACE_IFACE_NAME;
  574         ifp->if_unit = priv->unit;
  575         ifp->if_output = ng_iface_output;
  576         ifp->if_start = ng_iface_start;
  577         ifp->if_ioctl = ng_iface_ioctl;
  578         ifp->if_watchdog = NULL;
  579         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
  580         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  581         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  582         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  583         ifp->if_addrlen = 0;                    /* XXX */
  584         ifp->if_hdrlen = 0;                     /* XXX */
  585         ifp->if_baudrate = 64000;               /* XXX */
  586         TAILQ_INIT(&ifp->if_addrhead);
  587 
  588         /* Give this node the same name as the interface (if possible) */
  589         bzero(ifname, sizeof(ifname));
  590         snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit);
  591         if (ng_name_node(node, ifname) != 0)
  592                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
  593 
  594         /* Attach the interface */
  595         if_attach(ifp);
  596         bpfattach(ifp, DLT_NULL, sizeof(u_int));
  597 
  598         /* Done */
  599         return (0);
  600 }
  601 
  602 /*
  603  * Give our ok for a hook to be added
  604  */
  605 static int
  606 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  607 {
  608         const iffam_p iffam = get_iffam_from_name(name);
  609         hook_p *hookptr;
  610 
  611         if (iffam == NULL)
  612                 return (EPFNOSUPPORT);
  613         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  614         if (*hookptr != NULL)
  615                 return (EISCONN);
  616         *hookptr = hook;
  617         return (0);
  618 }
  619 
  620 /*
  621  * Receive a control message
  622  */
  623 static int
  624 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  625 {
  626         const priv_p priv = NG_NODE_PRIVATE(node);
  627         struct ifnet *const ifp = priv->ifp;
  628         struct ng_mesg *resp = NULL;
  629         int error = 0;
  630         struct ng_mesg *msg;
  631 
  632         NGI_GET_MSG(item, msg);
  633         switch (msg->header.typecookie) {
  634         case NGM_IFACE_COOKIE:
  635                 switch (msg->header.cmd) {
  636                 case NGM_IFACE_GET_IFNAME:
  637                     {
  638                         struct ng_iface_ifname *arg;
  639 
  640                         NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
  641                         if (resp == NULL) {
  642                                 error = ENOMEM;
  643                                 break;
  644                         }
  645                         arg = (struct ng_iface_ifname *)resp->data;
  646                         snprintf(arg->ngif_name, sizeof(arg->ngif_name),
  647                             "%s%d", ifp->if_name, ifp->if_unit);
  648                         break;
  649                     }
  650 
  651                 case NGM_IFACE_POINT2POINT:
  652                 case NGM_IFACE_BROADCAST:
  653                     {
  654 
  655                         /* Deny request if interface is UP */
  656                         if ((ifp->if_flags & IFF_UP) != 0)
  657                                 return (EBUSY);
  658 
  659                         /* Change flags */
  660                         switch (msg->header.cmd) {
  661                         case NGM_IFACE_POINT2POINT:
  662                                 ifp->if_flags |= IFF_POINTOPOINT;
  663                                 ifp->if_flags &= ~IFF_BROADCAST;
  664                                 break;
  665                         case NGM_IFACE_BROADCAST:
  666                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  667                                 ifp->if_flags |= IFF_BROADCAST;
  668                                 break;
  669                         }
  670                         break;
  671                     }
  672 
  673                 default:
  674                         error = EINVAL;
  675                         break;
  676                 }
  677                 break;
  678         case NGM_CISCO_COOKIE:
  679                 switch (msg->header.cmd) {
  680                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
  681                     {
  682                         struct ifaddr *ifa;
  683 
  684                         /* Return the first configured IP address */
  685                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  686                                 struct ng_cisco_ipaddr *ips;
  687 
  688                                 if (ifa->ifa_addr->sa_family != AF_INET)
  689                                         continue;
  690                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
  691                                 if (resp == NULL) {
  692                                         error = ENOMEM;
  693                                         break;
  694                                 }
  695                                 ips = (struct ng_cisco_ipaddr *)resp->data;
  696                                 ips->ipaddr = ((struct sockaddr_in *)
  697                                                 ifa->ifa_addr)->sin_addr;
  698                                 ips->netmask = ((struct sockaddr_in *)
  699                                                 ifa->ifa_netmask)->sin_addr;
  700                                 break;
  701                         }
  702 
  703                         /* No IP addresses on this interface? */
  704                         if (ifa == NULL)
  705                                 error = EADDRNOTAVAIL;
  706                         break;
  707                     }
  708                 default:
  709                         error = EINVAL;
  710                         break;
  711                 }
  712                 break;
  713         default:
  714                 error = EINVAL;
  715                 break;
  716         }
  717         NG_RESPOND_MSG(error, node, item, resp);
  718         NG_FREE_MSG(msg);
  719         return (error);
  720 }
  721 
  722 /*
  723  * Recive data from a hook. Pass the packet to the correct input routine.
  724  */
  725 static int
  726 ng_iface_rcvdata(hook_p hook, item_p item)
  727 {
  728         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  729         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  730         struct ifnet *const ifp = priv->ifp;
  731         struct mbuf *m;
  732 
  733         NGI_GET_M(item, m);
  734         NG_FREE_ITEM(item);
  735         /* Sanity checks */
  736         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  737         KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
  738         if (m == NULL)
  739                 return (EINVAL);
  740         if ((ifp->if_flags & IFF_UP) == 0) {
  741                 NG_FREE_M(m);
  742                 return (ENETDOWN);
  743         }
  744 
  745         /* Update interface stats */
  746         ifp->if_ipackets++;
  747         ifp->if_ibytes += m->m_pkthdr.len;
  748 
  749         /* Note receiving interface */
  750         m->m_pkthdr.rcvif = ifp;
  751 
  752         /* Berkeley packet filter */
  753         ng_iface_bpftap(ifp, m, iffam->family);
  754 
  755         /* Send packet */
  756         return family_enqueue(iffam->family, m);
  757 }
  758 
  759 /*
  760  * Shutdown and remove the node and its associated interface.
  761  */
  762 static int
  763 ng_iface_shutdown(node_p node)
  764 {
  765         const priv_p priv = NG_NODE_PRIVATE(node);
  766 
  767         bpfdetach(priv->ifp);
  768         if_detach(priv->ifp);
  769         FREE(priv->ifp, M_NETGRAPH_IFACE);
  770         priv->ifp = NULL;
  771         ng_iface_free_unit(priv->unit);
  772         FREE(priv, M_NETGRAPH_IFACE);
  773         NG_NODE_SET_PRIVATE(node, NULL);
  774         NG_NODE_UNREF(node);
  775         return (0);
  776 }
  777 
  778 /*
  779  * Hook disconnection. Note that we do *not* shutdown when all
  780  * hooks have been disconnected.
  781  */
  782 static int
  783 ng_iface_disconnect(hook_p hook)
  784 {
  785         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  786         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  787 
  788         if (iffam == NULL)
  789                 panic(__func__);
  790         *get_hook_from_iffam(priv, iffam) = NULL;
  791         return (0);
  792 }
  793 

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