The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_iface.c

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    1 /*
    2  * ng_iface.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Archie Cobbs <archie@freebsd.org>
   39  *
   40  * $FreeBSD: releng/9.0/sys/netgraph/ng_iface.c 223741 2011-07-03 16:08:38Z 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 error = 0;
  290 
  291 #ifdef DEBUG
  292         ng_iface_print_ioctl(ifp, command, data);
  293 #endif
  294         switch (command) {
  295 
  296         /* These two are mostly handled at a higher layer */
  297         case SIOCSIFADDR:
  298                 ifp->if_flags |= IFF_UP;
  299                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  300                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  301                 break;
  302         case SIOCGIFADDR:
  303                 break;
  304 
  305         /* Set flags */
  306         case SIOCSIFFLAGS:
  307                 /*
  308                  * If the interface is marked up and stopped, then start it.
  309                  * If it is marked down and running, then stop it.
  310                  */
  311                 if (ifr->ifr_flags & IFF_UP) {
  312                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  313                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  314                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  315                         }
  316                 } else {
  317                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  318                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  319                                     IFF_DRV_OACTIVE);
  320                 }
  321                 break;
  322 
  323         /* Set the interface MTU */
  324         case SIOCSIFMTU:
  325                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  326                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  327                         error = EINVAL;
  328                 else
  329                         ifp->if_mtu = ifr->ifr_mtu;
  330                 break;
  331 
  332         /* Stuff that's not supported */
  333         case SIOCADDMULTI:
  334         case SIOCDELMULTI:
  335                 error = 0;
  336                 break;
  337         case SIOCSIFPHYS:
  338                 error = EOPNOTSUPP;
  339                 break;
  340 
  341         default:
  342                 error = EINVAL;
  343                 break;
  344         }
  345         return (error);
  346 }
  347 
  348 /*
  349  * This routine is called to deliver a packet out the interface.
  350  * We simply look at the address family and relay the packet to
  351  * the corresponding hook, if it exists and is connected.
  352  */
  353 
  354 static int
  355 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  356                 struct sockaddr *dst, struct route *ro)
  357 {
  358         struct m_tag *mtag;
  359         uint32_t af;
  360         int error;
  361 
  362         /* Check interface flags */
  363         if (!((ifp->if_flags & IFF_UP) &&
  364             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  365                 m_freem(m);
  366                 return (ENETDOWN);
  367         }
  368 
  369         /* Protect from deadly infinite recursion. */
  370         mtag = NULL;
  371         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
  372                 if (*(struct ifnet **)(mtag + 1) == ifp) {
  373                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
  374                         m_freem(m);
  375                         return (EDEADLK);
  376                 }
  377         }
  378         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
  379             M_NOWAIT);
  380         if (mtag == NULL) {
  381                 m_freem(m);
  382                 return (ENOMEM);
  383         }
  384         *(struct ifnet **)(mtag + 1) = ifp;
  385         m_tag_prepend(m, mtag);
  386 
  387         /* BPF writes need to be handled specially. */
  388         if (dst->sa_family == AF_UNSPEC) {
  389                 bcopy(dst->sa_data, &af, sizeof(af));
  390                 dst->sa_family = af;
  391         }
  392 
  393         /* Berkeley packet filter */
  394         ng_iface_bpftap(ifp, m, dst->sa_family);
  395 
  396         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  397                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
  398                 if (m == NULL) {
  399                         IFQ_LOCK(&ifp->if_snd);
  400                         IFQ_INC_DROPS(&ifp->if_snd);
  401                         IFQ_UNLOCK(&ifp->if_snd);
  402                         ifp->if_oerrors++;
  403                         return (ENOBUFS);
  404                 }
  405                 *(sa_family_t *)m->m_data = dst->sa_family;
  406                 error = (ifp->if_transmit)(ifp, m);
  407         } else
  408                 error = ng_iface_send(ifp, m, dst->sa_family);
  409 
  410         return (error);
  411 }
  412 
  413 /*
  414  * Start method is used only when ALTQ is enabled.
  415  */
  416 static void
  417 ng_iface_start(struct ifnet *ifp)
  418 {
  419         struct mbuf *m;
  420         sa_family_t sa;
  421 
  422         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  423 
  424         for(;;) {
  425                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  426                 if (m == NULL)
  427                         break;
  428                 sa = *mtod(m, sa_family_t *);
  429                 m_adj(m, sizeof(sa_family_t));
  430                 ng_iface_send(ifp, m, sa);
  431         }
  432 }
  433 
  434 /*
  435  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  436  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  437  */
  438 static void
  439 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  440 {
  441         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  442         if (bpf_peers_present(ifp->if_bpf)) {
  443                 int32_t family4 = (int32_t)family;
  444                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  445         }
  446 }
  447 
  448 /*
  449  * This routine does actual delivery of the packet into the
  450  * netgraph(4). It is called from ng_iface_start() and
  451  * ng_iface_output().
  452  */
  453 static int
  454 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  455 {
  456         const priv_p priv = (priv_p) ifp->if_softc;
  457         const iffam_p iffam = get_iffam_from_af(sa);
  458         int error;
  459         int len;
  460 
  461         /* Check address family to determine hook (if known) */
  462         if (iffam == NULL) {
  463                 m_freem(m);
  464                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  465                 return (EAFNOSUPPORT);
  466         }
  467 
  468         /* Copy length before the mbuf gets invalidated. */
  469         len = m->m_pkthdr.len;
  470 
  471         /* Send packet. If hook is not connected, mbuf will get freed. */
  472         NG_OUTBOUND_THREAD_REF();
  473         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
  474         NG_OUTBOUND_THREAD_UNREF();
  475 
  476         /* Update stats. */
  477         if (error == 0) {
  478                 ifp->if_obytes += len;
  479                 ifp->if_opackets++;
  480         }
  481 
  482         return (error);
  483 }
  484 
  485 #ifdef DEBUG
  486 /*
  487  * Display an ioctl to the virtual interface
  488  */
  489 
  490 static void
  491 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  492 {
  493         char   *str;
  494 
  495         switch (command & IOC_DIRMASK) {
  496         case IOC_VOID:
  497                 str = "IO";
  498                 break;
  499         case IOC_OUT:
  500                 str = "IOR";
  501                 break;
  502         case IOC_IN:
  503                 str = "IOW";
  504                 break;
  505         case IOC_INOUT:
  506                 str = "IORW";
  507                 break;
  508         default:
  509                 str = "IO??";
  510         }
  511         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  512                ifp->if_xname,
  513                str,
  514                IOCGROUP(command),
  515                command & 0xff,
  516                IOCPARM_LEN(command));
  517 }
  518 #endif /* DEBUG */
  519 
  520 /************************************************************************
  521                         NETGRAPH NODE STUFF
  522  ************************************************************************/
  523 
  524 /*
  525  * Constructor for a node
  526  */
  527 static int
  528 ng_iface_constructor(node_p node)
  529 {
  530         struct ifnet *ifp;
  531         priv_p priv;
  532 
  533         /* Allocate node and interface private structures */
  534         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
  535         ifp = if_alloc(IFT_PROPVIRTUAL);
  536         if (ifp == NULL) {
  537                 free(priv, M_NETGRAPH_IFACE);
  538                 return (ENOMEM);
  539         }
  540 
  541         /* Link them together */
  542         ifp->if_softc = priv;
  543         priv->ifp = ifp;
  544 
  545         /* Get an interface unit number */
  546         priv->unit = alloc_unr(V_ng_iface_unit);
  547 
  548         /* Link together node and private info */
  549         NG_NODE_SET_PRIVATE(node, priv);
  550         priv->node = node;
  551 
  552         /* Initialize interface structure */
  553         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  554         ifp->if_output = ng_iface_output;
  555         ifp->if_start = ng_iface_start;
  556         ifp->if_ioctl = ng_iface_ioctl;
  557         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  558         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  559         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  560         ifp->if_addrlen = 0;                    /* XXX */
  561         ifp->if_hdrlen = 0;                     /* XXX */
  562         ifp->if_baudrate = 64000;               /* XXX */
  563         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  564         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  565         IFQ_SET_READY(&ifp->if_snd);
  566 
  567         /* Give this node the same name as the interface (if possible) */
  568         if (ng_name_node(node, ifp->if_xname) != 0)
  569                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  570                     ifp->if_xname);
  571 
  572         /* Attach the interface */
  573         if_attach(ifp);
  574         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  575 
  576         /* Done */
  577         return (0);
  578 }
  579 
  580 /*
  581  * Give our ok for a hook to be added
  582  */
  583 static int
  584 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  585 {
  586         const iffam_p iffam = get_iffam_from_name(name);
  587         hook_p *hookptr;
  588 
  589         if (iffam == NULL)
  590                 return (EPFNOSUPPORT);
  591         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  592         if (*hookptr != NULL)
  593                 return (EISCONN);
  594         *hookptr = hook;
  595         NG_HOOK_HI_STACK(hook);
  596         NG_HOOK_SET_TO_INBOUND(hook);
  597         return (0);
  598 }
  599 
  600 /*
  601  * Receive a control message
  602  */
  603 static int
  604 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  605 {
  606         const priv_p priv = NG_NODE_PRIVATE(node);
  607         struct ifnet *const ifp = priv->ifp;
  608         struct ng_mesg *resp = NULL;
  609         int error = 0;
  610         struct ng_mesg *msg;
  611 
  612         NGI_GET_MSG(item, msg);
  613         switch (msg->header.typecookie) {
  614         case NGM_IFACE_COOKIE:
  615                 switch (msg->header.cmd) {
  616                 case NGM_IFACE_GET_IFNAME:
  617                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  618                         if (resp == NULL) {
  619                                 error = ENOMEM;
  620                                 break;
  621                         }
  622                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  623                         break;
  624 
  625                 case NGM_IFACE_POINT2POINT:
  626                 case NGM_IFACE_BROADCAST:
  627                     {
  628 
  629                         /* Deny request if interface is UP */
  630                         if ((ifp->if_flags & IFF_UP) != 0)
  631                                 return (EBUSY);
  632 
  633                         /* Change flags */
  634                         switch (msg->header.cmd) {
  635                         case NGM_IFACE_POINT2POINT:
  636                                 ifp->if_flags |= IFF_POINTOPOINT;
  637                                 ifp->if_flags &= ~IFF_BROADCAST;
  638                                 break;
  639                         case NGM_IFACE_BROADCAST:
  640                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  641                                 ifp->if_flags |= IFF_BROADCAST;
  642                                 break;
  643                         }
  644                         break;
  645                     }
  646 
  647                 case NGM_IFACE_GET_IFINDEX:
  648                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  649                         if (resp == NULL) {
  650                                 error = ENOMEM;
  651                                 break;
  652                         }
  653                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  654                         break;
  655 
  656                 default:
  657                         error = EINVAL;
  658                         break;
  659                 }
  660                 break;
  661         case NGM_CISCO_COOKIE:
  662                 switch (msg->header.cmd) {
  663                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
  664                     {
  665                         struct ifaddr *ifa;
  666 
  667                         /* Return the first configured IP address */
  668                         if_addr_rlock(ifp);
  669                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  670                                 struct ng_cisco_ipaddr *ips;
  671 
  672                                 if (ifa->ifa_addr->sa_family != AF_INET)
  673                                         continue;
  674                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
  675                                 if (resp == NULL) {
  676                                         error = ENOMEM;
  677                                         break;
  678                                 }
  679                                 ips = (struct ng_cisco_ipaddr *)resp->data;
  680                                 ips->ipaddr = ((struct sockaddr_in *)
  681                                                 ifa->ifa_addr)->sin_addr;
  682                                 ips->netmask = ((struct sockaddr_in *)
  683                                                 ifa->ifa_netmask)->sin_addr;
  684                                 break;
  685                         }
  686                         if_addr_runlock(ifp);
  687 
  688                         /* No IP addresses on this interface? */
  689                         if (ifa == NULL)
  690                                 error = EADDRNOTAVAIL;
  691                         break;
  692                     }
  693                 default:
  694                         error = EINVAL;
  695                         break;
  696                 }
  697                 break;
  698         case NGM_FLOW_COOKIE:
  699                 switch (msg->header.cmd) {
  700                 case NGM_LINK_IS_UP:
  701                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  702                         break;
  703                 case NGM_LINK_IS_DOWN:
  704                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  705                         break;
  706                 default:
  707                         break;
  708                 }
  709                 break;
  710         default:
  711                 error = EINVAL;
  712                 break;
  713         }
  714         NG_RESPOND_MSG(error, node, item, resp);
  715         NG_FREE_MSG(msg);
  716         return (error);
  717 }
  718 
  719 /*
  720  * Recive data from a hook. Pass the packet to the correct input routine.
  721  */
  722 static int
  723 ng_iface_rcvdata(hook_p hook, item_p item)
  724 {
  725         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  726         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  727         struct ifnet *const ifp = priv->ifp;
  728         struct mbuf *m;
  729         int isr;
  730 
  731         NGI_GET_M(item, m);
  732         NG_FREE_ITEM(item);
  733         /* Sanity checks */
  734         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  735         M_ASSERTPKTHDR(m);
  736         if ((ifp->if_flags & IFF_UP) == 0) {
  737                 NG_FREE_M(m);
  738                 return (ENETDOWN);
  739         }
  740 
  741         /* Update interface stats */
  742         ifp->if_ipackets++;
  743         ifp->if_ibytes += m->m_pkthdr.len;
  744 
  745         /* Note receiving interface */
  746         m->m_pkthdr.rcvif = ifp;
  747 
  748         /* Berkeley packet filter */
  749         ng_iface_bpftap(ifp, m, iffam->family);
  750 
  751         /* Send packet */
  752         switch (iffam->family) {
  753 #ifdef INET
  754         case AF_INET:
  755                 isr = NETISR_IP;
  756                 break;
  757 #endif
  758 #ifdef INET6
  759         case AF_INET6:
  760                 isr = NETISR_IPV6;
  761                 break;
  762 #endif
  763 #ifdef IPX
  764         case AF_IPX:
  765                 isr = NETISR_IPX;
  766                 break;
  767 #endif
  768 #ifdef NETATALK
  769         case AF_APPLETALK:
  770                 isr = NETISR_ATALK2;
  771                 break;
  772 #endif
  773         default:
  774                 m_freem(m);
  775                 return (EAFNOSUPPORT);
  776         }
  777         /* First chunk of an mbuf contains good junk */
  778         if (harvest.point_to_point)
  779                 random_harvest(m, 16, 3, 0, RANDOM_NET);
  780         M_SETFIB(m, ifp->if_fib);
  781         netisr_dispatch(isr, m);
  782         return (0);
  783 }
  784 
  785 /*
  786  * Shutdown and remove the node and its associated interface.
  787  */
  788 static int
  789 ng_iface_shutdown(node_p node)
  790 {
  791         const priv_p priv = NG_NODE_PRIVATE(node);
  792 
  793         /*
  794          * The ifnet may be in a different vnet than the netgraph node, 
  795          * hence we have to change the current vnet context here.
  796          */
  797         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  798         bpfdetach(priv->ifp);
  799         if_detach(priv->ifp);
  800         if_free(priv->ifp);
  801         CURVNET_RESTORE();
  802         priv->ifp = NULL;
  803         free_unr(V_ng_iface_unit, priv->unit);
  804         free(priv, M_NETGRAPH_IFACE);
  805         NG_NODE_SET_PRIVATE(node, NULL);
  806         NG_NODE_UNREF(node);
  807         return (0);
  808 }
  809 
  810 /*
  811  * Hook disconnection. Note that we do *not* shutdown when all
  812  * hooks have been disconnected.
  813  */
  814 static int
  815 ng_iface_disconnect(hook_p hook)
  816 {
  817         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  818         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  819 
  820         if (iffam == NULL)
  821                 panic("%s", __func__);
  822         *get_hook_from_iffam(priv, iffam) = NULL;
  823         return (0);
  824 }
  825 
  826 /*
  827  * Handle loading and unloading for this node type.
  828  */
  829 static int
  830 ng_iface_mod_event(module_t mod, int event, void *data)
  831 {
  832         int error = 0;
  833 
  834         switch (event) {
  835         case MOD_LOAD:
  836         case MOD_UNLOAD:
  837                 break;
  838         default:
  839                 error = EOPNOTSUPP;
  840                 break;
  841         }
  842         return (error);
  843 }
  844 
  845 static void
  846 vnet_ng_iface_init(const void *unused)
  847 {
  848 
  849         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  850 }
  851 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  852     vnet_ng_iface_init, NULL);
  853 
  854 static void
  855 vnet_ng_iface_uninit(const void *unused)
  856 {
  857 
  858         delete_unrhdr(V_ng_iface_unit);
  859 }
  860 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  861     vnet_ng_iface_uninit, NULL);

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