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: stable/8/sys/netgraph/ng_iface.c 231380 2012-02-10 13:15:11Z bz $
   41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 /*
   45  * This node is also a system networking interface. It has
   46  * a hook for each protocol (IP, AppleTalk, 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/proc.h>
   68 #include <sys/random.h>
   69 #include <sys/sockio.h>
   70 #include <sys/socket.h>
   71 #include <sys/syslog.h>
   72 #include <sys/libkern.h>
   73 
   74 #include <net/if.h>
   75 #include <net/if_types.h>
   76 #include <net/bpf.h>
   77 #include <net/netisr.h>
   78 #include <net/route.h>
   79 #include <net/vnet.h>
   80 
   81 #include <netinet/in.h>
   82 
   83 #include <netgraph/ng_message.h>
   84 #include <netgraph/netgraph.h>
   85 #include <netgraph/ng_parse.h>
   86 #include <netgraph/ng_iface.h>
   87 #include <netgraph/ng_cisco.h>
   88 
   89 #ifdef NG_SEPARATE_MALLOC
   90 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
   91 #else
   92 #define M_NETGRAPH_IFACE M_NETGRAPH
   93 #endif
   94 
   95 /* This struct describes one address family */
   96 struct iffam {
   97         sa_family_t     family;         /* Address family */
   98         const char      *hookname;      /* Name for hook */
   99 };
  100 typedef const struct iffam *iffam_p;
  101 
  102 /* List of address families supported by our interface */
  103 const static struct iffam gFamilies[] = {
  104         { AF_INET,      NG_IFACE_HOOK_INET      },
  105         { AF_INET6,     NG_IFACE_HOOK_INET6     },
  106         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
  107         { AF_IPX,       NG_IFACE_HOOK_IPX       },
  108         { AF_ATM,       NG_IFACE_HOOK_ATM       },
  109         { AF_NATM,      NG_IFACE_HOOK_NATM      },
  110 };
  111 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
  112 
  113 /* Node private data */
  114 struct ng_iface_private {
  115         struct  ifnet *ifp;             /* Our interface */
  116         int     unit;                   /* Interface unit number */
  117         node_p  node;                   /* Our netgraph node */
  118         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
  119 };
  120 typedef struct ng_iface_private *priv_p;
  121 
  122 /* Interface methods */
  123 static void     ng_iface_start(struct ifnet *ifp);
  124 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  125 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
  126                         struct sockaddr *dst, struct route *ro);
  127 static void     ng_iface_bpftap(struct ifnet *ifp,
  128                         struct mbuf *m, sa_family_t family);
  129 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
  130                         sa_family_t sa);
  131 #ifdef DEBUG
  132 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  133 #endif
  134 
  135 /* Netgraph methods */
  136 static int              ng_iface_mod_event(module_t, int, void *);
  137 static ng_constructor_t ng_iface_constructor;
  138 static ng_rcvmsg_t      ng_iface_rcvmsg;
  139 static ng_shutdown_t    ng_iface_shutdown;
  140 static ng_newhook_t     ng_iface_newhook;
  141 static ng_rcvdata_t     ng_iface_rcvdata;
  142 static ng_disconnect_t  ng_iface_disconnect;
  143 
  144 /* Helper stuff */
  145 static iffam_p  get_iffam_from_af(sa_family_t family);
  146 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  147 static iffam_p  get_iffam_from_name(const char *name);
  148 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  149 
  150 /* Parse type for struct ng_cisco_ipaddr */
  151 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
  152         = NG_CISCO_IPADDR_TYPE_INFO;
  153 static const struct ng_parse_type ng_cisco_ipaddr_type = {
  154         &ng_parse_struct_type,
  155         &ng_cisco_ipaddr_type_fields
  156 };
  157 
  158 /* List of commands and how to convert arguments to/from ASCII */
  159 static const struct ng_cmdlist ng_iface_cmds[] = {
  160         {
  161           NGM_IFACE_COOKIE,
  162           NGM_IFACE_GET_IFNAME,
  163           "getifname",
  164           NULL,
  165           &ng_parse_string_type
  166         },
  167         {
  168           NGM_IFACE_COOKIE,
  169           NGM_IFACE_POINT2POINT,
  170           "point2point",
  171           NULL,
  172           NULL
  173         },
  174         {
  175           NGM_IFACE_COOKIE,
  176           NGM_IFACE_BROADCAST,
  177           "broadcast",
  178           NULL,
  179           NULL
  180         },
  181         {
  182           NGM_CISCO_COOKIE,
  183           NGM_CISCO_GET_IPADDR,
  184           "getipaddr",
  185           NULL,
  186           &ng_cisco_ipaddr_type
  187         },
  188         {
  189           NGM_IFACE_COOKIE,
  190           NGM_IFACE_GET_IFINDEX,
  191           "getifindex",
  192           NULL,
  193           &ng_parse_uint32_type
  194         },
  195         { 0 }
  196 };
  197 
  198 /* Node type descriptor */
  199 static struct ng_type typestruct = {
  200         .version =      NG_ABI_VERSION,
  201         .name =         NG_IFACE_NODE_TYPE,
  202         .mod_event =    ng_iface_mod_event,
  203         .constructor =  ng_iface_constructor,
  204         .rcvmsg =       ng_iface_rcvmsg,
  205         .shutdown =     ng_iface_shutdown,
  206         .newhook =      ng_iface_newhook,
  207         .rcvdata =      ng_iface_rcvdata,
  208         .disconnect =   ng_iface_disconnect,
  209         .cmdlist =      ng_iface_cmds,
  210 };
  211 NETGRAPH_INIT(iface, &typestruct);
  212 
  213 static VNET_DEFINE(struct unrhdr *, ng_iface_unit);
  214 #define V_ng_iface_unit                 VNET(ng_iface_unit)
  215 
  216 /************************************************************************
  217                         HELPER STUFF
  218  ************************************************************************/
  219 
  220 /*
  221  * Get the family descriptor from the family ID
  222  */
  223 static __inline iffam_p
  224 get_iffam_from_af(sa_family_t family)
  225 {
  226         iffam_p iffam;
  227         int k;
  228 
  229         for (k = 0; k < NUM_FAMILIES; k++) {
  230                 iffam = &gFamilies[k];
  231                 if (iffam->family == family)
  232                         return (iffam);
  233         }
  234         return (NULL);
  235 }
  236 
  237 /*
  238  * Get the family descriptor from the hook
  239  */
  240 static __inline iffam_p
  241 get_iffam_from_hook(priv_p priv, hook_p hook)
  242 {
  243         int k;
  244 
  245         for (k = 0; k < NUM_FAMILIES; k++)
  246                 if (priv->hooks[k] == hook)
  247                         return (&gFamilies[k]);
  248         return (NULL);
  249 }
  250 
  251 /*
  252  * Get the hook from the iffam descriptor
  253  */
  254 
  255 static __inline hook_p *
  256 get_hook_from_iffam(priv_p priv, iffam_p iffam)
  257 {
  258         return (&priv->hooks[iffam - gFamilies]);
  259 }
  260 
  261 /*
  262  * Get the iffam descriptor from the name
  263  */
  264 static __inline iffam_p
  265 get_iffam_from_name(const char *name)
  266 {
  267         iffam_p iffam;
  268         int k;
  269 
  270         for (k = 0; k < NUM_FAMILIES; k++) {
  271                 iffam = &gFamilies[k];
  272                 if (!strcmp(iffam->hookname, name))
  273                         return (iffam);
  274         }
  275         return (NULL);
  276 }
  277 
  278 /************************************************************************
  279                         INTERFACE STUFF
  280  ************************************************************************/
  281 
  282 /*
  283  * Process an ioctl for the virtual interface
  284  */
  285 static int
  286 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  287 {
  288         struct ifreq *const ifr = (struct ifreq *) data;
  289         int s, error = 0;
  290 
  291 #ifdef DEBUG
  292         ng_iface_print_ioctl(ifp, command, data);
  293 #endif
  294         s = splimp();
  295         switch (command) {
  296 
  297         /* These two are mostly handled at a higher layer */
  298         case SIOCSIFADDR:
  299                 ifp->if_flags |= IFF_UP;
  300                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  301                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  302                 break;
  303         case SIOCGIFADDR:
  304                 break;
  305 
  306         /* Set flags */
  307         case SIOCSIFFLAGS:
  308                 /*
  309                  * If the interface is marked up and stopped, then start it.
  310                  * If it is marked down and running, then stop it.
  311                  */
  312                 if (ifr->ifr_flags & IFF_UP) {
  313                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  314                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  315                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  316                         }
  317                 } else {
  318                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  319                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  320                                     IFF_DRV_OACTIVE);
  321                 }
  322                 break;
  323 
  324         /* Set the interface MTU */
  325         case SIOCSIFMTU:
  326                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  327                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  328                         error = EINVAL;
  329                 else
  330                         ifp->if_mtu = ifr->ifr_mtu;
  331                 break;
  332 
  333         /* Stuff that's not supported */
  334         case SIOCADDMULTI:
  335         case SIOCDELMULTI:
  336                 error = 0;
  337                 break;
  338         case SIOCSIFPHYS:
  339                 error = EOPNOTSUPP;
  340                 break;
  341 
  342         default:
  343                 error = EINVAL;
  344                 break;
  345         }
  346         (void) splx(s);
  347         return (error);
  348 }
  349 
  350 /*
  351  * This routine is called to deliver a packet out the interface.
  352  * We simply look at the address family and relay the packet to
  353  * the corresponding hook, if it exists and is connected.
  354  */
  355 
  356 static int
  357 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  358                 struct sockaddr *dst, struct route *ro)
  359 {
  360         struct m_tag *mtag;
  361         uint32_t af;
  362         int error;
  363 
  364         /* Check interface flags */
  365         if (!((ifp->if_flags & IFF_UP) &&
  366             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  367                 m_freem(m);
  368                 return (ENETDOWN);
  369         }
  370 
  371         /* Protect from deadly infinite recursion. */
  372         mtag = NULL;
  373         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
  374                 if (*(struct ifnet **)(mtag + 1) == ifp) {
  375                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
  376                         m_freem(m);
  377                         return (EDEADLK);
  378                 }
  379         }
  380         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
  381             M_NOWAIT);
  382         if (mtag == NULL) {
  383                 m_freem(m);
  384                 return (ENOMEM);
  385         }
  386         *(struct ifnet **)(mtag + 1) = ifp;
  387         m_tag_prepend(m, mtag);
  388 
  389         /* BPF writes need to be handled specially. */
  390         if (dst->sa_family == AF_UNSPEC) {
  391                 bcopy(dst->sa_data, &af, sizeof(af));
  392                 dst->sa_family = af;
  393         }
  394 
  395         /* Berkeley packet filter */
  396         ng_iface_bpftap(ifp, m, dst->sa_family);
  397 
  398         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  399                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
  400                 if (m == NULL) {
  401                         IFQ_LOCK(&ifp->if_snd);
  402                         IFQ_INC_DROPS(&ifp->if_snd);
  403                         IFQ_UNLOCK(&ifp->if_snd);
  404                         ifp->if_oerrors++;
  405                         return (ENOBUFS);
  406                 }
  407                 *(sa_family_t *)m->m_data = dst->sa_family;
  408                 error = (ifp->if_transmit)(ifp, m);
  409         } else
  410                 error = ng_iface_send(ifp, m, dst->sa_family);
  411 
  412         return (error);
  413 }
  414 
  415 /*
  416  * Start method is used only when ALTQ is enabled.
  417  */
  418 static void
  419 ng_iface_start(struct ifnet *ifp)
  420 {
  421         struct mbuf *m;
  422         sa_family_t sa;
  423 
  424         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  425 
  426         for(;;) {
  427                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  428                 if (m == NULL)
  429                         break;
  430                 sa = *mtod(m, sa_family_t *);
  431                 m_adj(m, sizeof(sa_family_t));
  432                 ng_iface_send(ifp, m, sa);
  433         }
  434 }
  435 
  436 /*
  437  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  438  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  439  */
  440 static void
  441 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  442 {
  443         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  444         if (bpf_peers_present(ifp->if_bpf)) {
  445                 int32_t family4 = (int32_t)family;
  446                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  447         }
  448 }
  449 
  450 /*
  451  * This routine does actual delivery of the packet into the
  452  * netgraph(4). It is called from ng_iface_start() and
  453  * ng_iface_output().
  454  */
  455 static int
  456 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  457 {
  458         const priv_p priv = (priv_p) ifp->if_softc;
  459         const iffam_p iffam = get_iffam_from_af(sa);
  460         int error;
  461         int len;
  462 
  463         /* Check address family to determine hook (if known) */
  464         if (iffam == NULL) {
  465                 m_freem(m);
  466                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  467                 return (EAFNOSUPPORT);
  468         }
  469 
  470         /* Copy length before the mbuf gets invalidated. */
  471         len = m->m_pkthdr.len;
  472 
  473         /* Send packet. If hook is not connected, mbuf will get freed. */
  474         NG_OUTBOUND_THREAD_REF();
  475         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
  476         NG_OUTBOUND_THREAD_UNREF();
  477 
  478         /* Update stats. */
  479         if (error == 0) {
  480                 ifp->if_obytes += len;
  481                 ifp->if_opackets++;
  482         }
  483 
  484         return (error);
  485 }
  486 
  487 #ifdef DEBUG
  488 /*
  489  * Display an ioctl to the virtual interface
  490  */
  491 
  492 static void
  493 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  494 {
  495         char   *str;
  496 
  497         switch (command & IOC_DIRMASK) {
  498         case IOC_VOID:
  499                 str = "IO";
  500                 break;
  501         case IOC_OUT:
  502                 str = "IOR";
  503                 break;
  504         case IOC_IN:
  505                 str = "IOW";
  506                 break;
  507         case IOC_INOUT:
  508                 str = "IORW";
  509                 break;
  510         default:
  511                 str = "IO??";
  512         }
  513         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  514                ifp->if_xname,
  515                str,
  516                IOCGROUP(command),
  517                command & 0xff,
  518                IOCPARM_LEN(command));
  519 }
  520 #endif /* DEBUG */
  521 
  522 /************************************************************************
  523                         NETGRAPH NODE STUFF
  524  ************************************************************************/
  525 
  526 /*
  527  * Constructor for a node
  528  */
  529 static int
  530 ng_iface_constructor(node_p node)
  531 {
  532         struct ifnet *ifp;
  533         priv_p priv;
  534 
  535         /* Allocate node and interface private structures */
  536         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
  537         if (priv == NULL)
  538                 return (ENOMEM);
  539         ifp = if_alloc(IFT_PROPVIRTUAL);
  540         if (ifp == NULL) {
  541                 free(priv, M_NETGRAPH_IFACE);
  542                 return (ENOMEM);
  543         }
  544 
  545         /* Link them together */
  546         ifp->if_softc = priv;
  547         priv->ifp = ifp;
  548 
  549         /* Get an interface unit number */
  550         priv->unit = alloc_unr(V_ng_iface_unit);
  551 
  552         /* Link together node and private info */
  553         NG_NODE_SET_PRIVATE(node, priv);
  554         priv->node = node;
  555 
  556         /* Initialize interface structure */
  557         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  558         ifp->if_output = ng_iface_output;
  559         ifp->if_start = ng_iface_start;
  560         ifp->if_ioctl = ng_iface_ioctl;
  561         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  562         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  563         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  564         ifp->if_addrlen = 0;                    /* XXX */
  565         ifp->if_hdrlen = 0;                     /* XXX */
  566         ifp->if_baudrate = 64000;               /* XXX */
  567         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  568         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  569         IFQ_SET_READY(&ifp->if_snd);
  570 
  571         /* Give this node the same name as the interface (if possible) */
  572         if (ng_name_node(node, ifp->if_xname) != 0)
  573                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  574                     ifp->if_xname);
  575 
  576         /* Attach the interface */
  577         if_attach(ifp);
  578         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  579 
  580         /* Done */
  581         return (0);
  582 }
  583 
  584 /*
  585  * Give our ok for a hook to be added
  586  */
  587 static int
  588 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  589 {
  590         const iffam_p iffam = get_iffam_from_name(name);
  591         hook_p *hookptr;
  592 
  593         if (iffam == NULL)
  594                 return (EPFNOSUPPORT);
  595         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  596         if (*hookptr != NULL)
  597                 return (EISCONN);
  598         *hookptr = hook;
  599         NG_HOOK_HI_STACK(hook);
  600         NG_HOOK_SET_TO_INBOUND(hook);
  601         return (0);
  602 }
  603 
  604 /*
  605  * Receive a control message
  606  */
  607 static int
  608 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  609 {
  610         const priv_p priv = NG_NODE_PRIVATE(node);
  611         struct ifnet *const ifp = priv->ifp;
  612         struct ng_mesg *resp = NULL;
  613         int error = 0;
  614         struct ng_mesg *msg;
  615 
  616         NGI_GET_MSG(item, msg);
  617         switch (msg->header.typecookie) {
  618         case NGM_IFACE_COOKIE:
  619                 switch (msg->header.cmd) {
  620                 case NGM_IFACE_GET_IFNAME:
  621                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  622                         if (resp == NULL) {
  623                                 error = ENOMEM;
  624                                 break;
  625                         }
  626                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  627                         break;
  628 
  629                 case NGM_IFACE_POINT2POINT:
  630                 case NGM_IFACE_BROADCAST:
  631                     {
  632 
  633                         /* Deny request if interface is UP */
  634                         if ((ifp->if_flags & IFF_UP) != 0)
  635                                 return (EBUSY);
  636 
  637                         /* Change flags */
  638                         switch (msg->header.cmd) {
  639                         case NGM_IFACE_POINT2POINT:
  640                                 ifp->if_flags |= IFF_POINTOPOINT;
  641                                 ifp->if_flags &= ~IFF_BROADCAST;
  642                                 break;
  643                         case NGM_IFACE_BROADCAST:
  644                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  645                                 ifp->if_flags |= IFF_BROADCAST;
  646                                 break;
  647                         }
  648                         break;
  649                     }
  650 
  651                 case NGM_IFACE_GET_IFINDEX:
  652                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  653                         if (resp == NULL) {
  654                                 error = ENOMEM;
  655                                 break;
  656                         }
  657                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  658                         break;
  659 
  660                 default:
  661                         error = EINVAL;
  662                         break;
  663                 }
  664                 break;
  665         case NGM_CISCO_COOKIE:
  666                 switch (msg->header.cmd) {
  667                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
  668                     {
  669                         struct ifaddr *ifa;
  670 
  671                         /* Return the first configured IP address */
  672                         if_addr_rlock(ifp);
  673                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  674                                 struct ng_cisco_ipaddr *ips;
  675 
  676                                 if (ifa->ifa_addr->sa_family != AF_INET)
  677                                         continue;
  678                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
  679                                 if (resp == NULL) {
  680                                         error = ENOMEM;
  681                                         break;
  682                                 }
  683                                 ips = (struct ng_cisco_ipaddr *)resp->data;
  684                                 ips->ipaddr = ((struct sockaddr_in *)
  685                                                 ifa->ifa_addr)->sin_addr;
  686                                 ips->netmask = ((struct sockaddr_in *)
  687                                                 ifa->ifa_netmask)->sin_addr;
  688                                 break;
  689                         }
  690                         if_addr_runlock(ifp);
  691 
  692                         /* No IP addresses on this interface? */
  693                         if (ifa == NULL)
  694                                 error = EADDRNOTAVAIL;
  695                         break;
  696                     }
  697                 default:
  698                         error = EINVAL;
  699                         break;
  700                 }
  701                 break;
  702         case NGM_FLOW_COOKIE:
  703                 switch (msg->header.cmd) {
  704                 case NGM_LINK_IS_UP:
  705                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  706                         break;
  707                 case NGM_LINK_IS_DOWN:
  708                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  709                         break;
  710                 default:
  711                         break;
  712                 }
  713                 break;
  714         default:
  715                 error = EINVAL;
  716                 break;
  717         }
  718         NG_RESPOND_MSG(error, node, item, resp);
  719         NG_FREE_MSG(msg);
  720         return (error);
  721 }
  722 
  723 /*
  724  * Recive data from a hook. Pass the packet to the correct input routine.
  725  */
  726 static int
  727 ng_iface_rcvdata(hook_p hook, item_p item)
  728 {
  729         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  730         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  731         struct ifnet *const ifp = priv->ifp;
  732         struct mbuf *m;
  733         int isr;
  734 
  735         NGI_GET_M(item, m);
  736         NG_FREE_ITEM(item);
  737         /* Sanity checks */
  738         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  739         M_ASSERTPKTHDR(m);
  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         switch (iffam->family) {
  757 #ifdef INET
  758         case AF_INET:
  759                 isr = NETISR_IP;
  760                 break;
  761 #endif
  762 #ifdef INET6
  763         case AF_INET6:
  764                 isr = NETISR_IPV6;
  765                 break;
  766 #endif
  767 #ifdef IPX
  768         case AF_IPX:
  769                 isr = NETISR_IPX;
  770                 break;
  771 #endif
  772 #ifdef NETATALK
  773         case AF_APPLETALK:
  774                 isr = NETISR_ATALK2;
  775                 break;
  776 #endif
  777         default:
  778                 m_freem(m);
  779                 return (EAFNOSUPPORT);
  780         }
  781         /* First chunk of an mbuf contains good junk */
  782         if (harvest.point_to_point)
  783                 random_harvest(m, 16, 3, 0, RANDOM_NET);
  784         M_SETFIB(m, ifp->if_fib);
  785         netisr_dispatch(isr, m);
  786         return (0);
  787 }
  788 
  789 /*
  790  * Shutdown and remove the node and its associated interface.
  791  */
  792 static int
  793 ng_iface_shutdown(node_p node)
  794 {
  795         const priv_p priv = NG_NODE_PRIVATE(node);
  796 
  797         /*
  798          * The ifnet may be in a different vnet than the netgraph node, 
  799          * hence we have to change the current vnet context here.
  800          */
  801         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  802         bpfdetach(priv->ifp);
  803         if_detach(priv->ifp);
  804         if_free(priv->ifp);
  805         CURVNET_RESTORE();
  806         priv->ifp = NULL;
  807         free_unr(V_ng_iface_unit, priv->unit);
  808         free(priv, M_NETGRAPH_IFACE);
  809         NG_NODE_SET_PRIVATE(node, NULL);
  810         NG_NODE_UNREF(node);
  811         return (0);
  812 }
  813 
  814 /*
  815  * Hook disconnection. Note that we do *not* shutdown when all
  816  * hooks have been disconnected.
  817  */
  818 static int
  819 ng_iface_disconnect(hook_p hook)
  820 {
  821         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  822         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  823 
  824         if (iffam == NULL)
  825                 panic(__func__);
  826         *get_hook_from_iffam(priv, iffam) = NULL;
  827         return (0);
  828 }
  829 
  830 /*
  831  * Handle loading and unloading for this node type.
  832  */
  833 static int
  834 ng_iface_mod_event(module_t mod, int event, void *data)
  835 {
  836         int error = 0;
  837 
  838         switch (event) {
  839         case MOD_LOAD:
  840         case MOD_UNLOAD:
  841                 break;
  842         default:
  843                 error = EOPNOTSUPP;
  844                 break;
  845         }
  846         return (error);
  847 }
  848 
  849 static void
  850 vnet_ng_iface_init(const void *unused)
  851 {
  852 
  853         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  854 }
  855 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  856     vnet_ng_iface_init, NULL);
  857 
  858 static void
  859 vnet_ng_iface_uninit(const void *unused)
  860 {
  861 
  862         delete_unrhdr(V_ng_iface_unit);
  863 }
  864 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  865     vnet_ng_iface_uninit, NULL);

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