The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_iface.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/12/sys/netgraph/ng_iface.c 344139 2019-02-15 00:29:44Z glebius $
   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, 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_inet.h"
   56 #include "opt_inet6.h"
   57 
   58 #include <sys/param.h>
   59 #include <sys/systm.h>
   60 #include <sys/errno.h>
   61 #include <sys/kernel.h>
   62 #include <sys/lock.h>
   63 #include <sys/malloc.h>
   64 #include <sys/mbuf.h>
   65 #include <sys/errno.h>
   66 #include <sys/proc.h>
   67 #include <sys/random.h>
   68 #include <sys/rmlock.h>
   69 #include <sys/sockio.h>
   70 #include <sys/socket.h>
   71 #include <sys/sysctl.h>
   72 #include <sys/syslog.h>
   73 #include <sys/libkern.h>
   74 
   75 #include <net/if.h>
   76 #include <net/if_var.h>
   77 #include <net/if_types.h>
   78 #include <net/bpf.h>
   79 #include <net/netisr.h>
   80 #include <net/route.h>
   81 #include <net/vnet.h>
   82 
   83 #include <netinet/in.h>
   84 
   85 #include <netgraph/ng_message.h>
   86 #include <netgraph/netgraph.h>
   87 #include <netgraph/ng_parse.h>
   88 #include <netgraph/ng_iface.h>
   89 
   90 #ifdef NG_SEPARATE_MALLOC
   91 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
   92 #else
   93 #define M_NETGRAPH_IFACE M_NETGRAPH
   94 #endif
   95 
   96 static SYSCTL_NODE(_net_graph, OID_AUTO, iface, CTLFLAG_RW, 0,
   97     "Point to point netgraph interface");
   98 VNET_DEFINE_STATIC(int, ng_iface_max_nest) = 2;
   99 #define V_ng_iface_max_nest     VNET(ng_iface_max_nest)
  100 SYSCTL_INT(_net_graph_iface, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
  101     &VNET_NAME(ng_iface_max_nest), 0, "Max nested tunnels");
  102 
  103 /* This struct describes one address family */
  104 struct iffam {
  105         sa_family_t     family;         /* Address family */
  106         const char      *hookname;      /* Name for hook */
  107 };
  108 typedef const struct iffam *iffam_p;
  109 
  110 /* List of address families supported by our interface */
  111 const static struct iffam gFamilies[] = {
  112         { AF_INET,      NG_IFACE_HOOK_INET      },
  113         { AF_INET6,     NG_IFACE_HOOK_INET6     },
  114         { AF_ATM,       NG_IFACE_HOOK_ATM       },
  115         { AF_NATM,      NG_IFACE_HOOK_NATM      },
  116 };
  117 #define NUM_FAMILIES            nitems(gFamilies)
  118 
  119 /* Node private data */
  120 struct ng_iface_private {
  121         struct  ifnet *ifp;             /* Our interface */
  122         int     unit;                   /* Interface unit number */
  123         node_p  node;                   /* Our netgraph node */
  124         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
  125         struct rmlock   lock;           /* Protect private data changes */
  126 };
  127 typedef struct ng_iface_private *priv_p;
  128 
  129 #define PRIV_RLOCK(priv, t)     rm_rlock(&priv->lock, t)
  130 #define PRIV_RUNLOCK(priv, t)   rm_runlock(&priv->lock, t)
  131 #define PRIV_WLOCK(priv)        rm_wlock(&priv->lock)
  132 #define PRIV_WUNLOCK(priv)      rm_wunlock(&priv->lock)
  133 
  134 /* Interface methods */
  135 static void     ng_iface_start(struct ifnet *ifp);
  136 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  137 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
  138                         const struct sockaddr *dst, struct route *ro);
  139 static void     ng_iface_bpftap(struct ifnet *ifp,
  140                         struct mbuf *m, sa_family_t family);
  141 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
  142                         sa_family_t sa);
  143 #ifdef DEBUG
  144 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  145 #endif
  146 
  147 /* Netgraph methods */
  148 static int              ng_iface_mod_event(module_t, int, void *);
  149 static ng_constructor_t ng_iface_constructor;
  150 static ng_rcvmsg_t      ng_iface_rcvmsg;
  151 static ng_shutdown_t    ng_iface_shutdown;
  152 static ng_newhook_t     ng_iface_newhook;
  153 static ng_rcvdata_t     ng_iface_rcvdata;
  154 static ng_disconnect_t  ng_iface_disconnect;
  155 
  156 /* Helper stuff */
  157 static iffam_p  get_iffam_from_af(sa_family_t family);
  158 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  159 static iffam_p  get_iffam_from_name(const char *name);
  160 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  161 
  162 /* List of commands and how to convert arguments to/from ASCII */
  163 static const struct ng_cmdlist ng_iface_cmds[] = {
  164         {
  165           NGM_IFACE_COOKIE,
  166           NGM_IFACE_GET_IFNAME,
  167           "getifname",
  168           NULL,
  169           &ng_parse_string_type
  170         },
  171         {
  172           NGM_IFACE_COOKIE,
  173           NGM_IFACE_POINT2POINT,
  174           "point2point",
  175           NULL,
  176           NULL
  177         },
  178         {
  179           NGM_IFACE_COOKIE,
  180           NGM_IFACE_BROADCAST,
  181           "broadcast",
  182           NULL,
  183           NULL
  184         },
  185         {
  186           NGM_IFACE_COOKIE,
  187           NGM_IFACE_GET_IFINDEX,
  188           "getifindex",
  189           NULL,
  190           &ng_parse_uint32_type
  191         },
  192         { 0 }
  193 };
  194 
  195 /* Node type descriptor */
  196 static struct ng_type typestruct = {
  197         .version =      NG_ABI_VERSION,
  198         .name =         NG_IFACE_NODE_TYPE,
  199         .mod_event =    ng_iface_mod_event,
  200         .constructor =  ng_iface_constructor,
  201         .rcvmsg =       ng_iface_rcvmsg,
  202         .shutdown =     ng_iface_shutdown,
  203         .newhook =      ng_iface_newhook,
  204         .rcvdata =      ng_iface_rcvdata,
  205         .disconnect =   ng_iface_disconnect,
  206         .cmdlist =      ng_iface_cmds,
  207 };
  208 NETGRAPH_INIT(iface, &typestruct);
  209 
  210 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit);
  211 #define V_ng_iface_unit                 VNET(ng_iface_unit)
  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                         INTERFACE STUFF
  277  ************************************************************************/
  278 
  279 /*
  280  * Process an ioctl for the virtual interface
  281  */
  282 static int
  283 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  284 {
  285         struct ifreq *const ifr = (struct ifreq *) data;
  286         int error = 0;
  287 
  288 #ifdef DEBUG
  289         ng_iface_print_ioctl(ifp, command, data);
  290 #endif
  291         switch (command) {
  292 
  293         /* These two are mostly handled at a higher layer */
  294         case SIOCSIFADDR:
  295                 ifp->if_flags |= IFF_UP;
  296                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  297                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  298                 break;
  299         case SIOCGIFADDR:
  300                 break;
  301 
  302         /* Set flags */
  303         case SIOCSIFFLAGS:
  304                 /*
  305                  * If the interface is marked up and stopped, then start it.
  306                  * If it is marked down and running, then stop it.
  307                  */
  308                 if (ifr->ifr_flags & IFF_UP) {
  309                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  310                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  311                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  312                         }
  313                 } else {
  314                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  315                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  316                                     IFF_DRV_OACTIVE);
  317                 }
  318                 break;
  319 
  320         /* Set the interface MTU */
  321         case SIOCSIFMTU:
  322                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
  323                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
  324                         error = EINVAL;
  325                 else
  326                         ifp->if_mtu = ifr->ifr_mtu;
  327                 break;
  328 
  329         /* Stuff that's not supported */
  330         case SIOCADDMULTI:
  331         case SIOCDELMULTI:
  332                 error = 0;
  333                 break;
  334         case SIOCSIFPHYS:
  335                 error = EOPNOTSUPP;
  336                 break;
  337 
  338         default:
  339                 error = EINVAL;
  340                 break;
  341         }
  342         return (error);
  343 }
  344 
  345 /*
  346  * This routine is called to deliver a packet out the interface.
  347  * We simply look at the address family and relay the packet to
  348  * the corresponding hook, if it exists and is connected.
  349  */
  350 
  351 static int
  352 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
  353         const struct sockaddr *dst, struct route *ro)
  354 {
  355         uint32_t af;
  356         int error;
  357 
  358         /* Check interface flags */
  359         if (!((ifp->if_flags & IFF_UP) &&
  360             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  361                 m_freem(m);
  362                 return (ENETDOWN);
  363         }
  364 
  365         /* Protect from deadly infinite recursion. */
  366         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE,
  367             V_ng_iface_max_nest);
  368         if (error) {
  369                 m_freem(m);
  370                 return (error);
  371         }
  372 
  373         /* BPF writes need to be handled specially. */
  374         if (dst->sa_family == AF_UNSPEC)
  375                 bcopy(dst->sa_data, &af, sizeof(af));
  376         else
  377                 af = dst->sa_family;
  378 
  379         /* Berkeley packet filter */
  380         ng_iface_bpftap(ifp, m, af);
  381 
  382         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
  383                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
  384                 if (m == NULL) {
  385                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
  386                         return (ENOBUFS);
  387                 }
  388                 *(sa_family_t *)m->m_data = af;
  389                 error = (ifp->if_transmit)(ifp, m);
  390         } else
  391                 error = ng_iface_send(ifp, m, af);
  392 
  393         return (error);
  394 }
  395 
  396 /*
  397  * Start method is used only when ALTQ is enabled.
  398  */
  399 static void
  400 ng_iface_start(struct ifnet *ifp)
  401 {
  402         struct mbuf *m;
  403         sa_family_t sa;
  404 
  405         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
  406 
  407         for(;;) {
  408                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  409                 if (m == NULL)
  410                         break;
  411                 sa = *mtod(m, sa_family_t *);
  412                 m_adj(m, sizeof(sa_family_t));
  413                 ng_iface_send(ifp, m, sa);
  414         }
  415 }
  416 
  417 /*
  418  * Flash a packet by the BPF (requires prepending 4 byte AF header)
  419  * Note the phoney mbuf; this is OK because BPF treats it read-only.
  420  */
  421 static void
  422 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
  423 {
  424         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
  425         if (bpf_peers_present(ifp->if_bpf)) {
  426                 int32_t family4 = (int32_t)family;
  427                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
  428         }
  429 }
  430 
  431 /*
  432  * This routine does actual delivery of the packet into the
  433  * netgraph(4). It is called from ng_iface_start() and
  434  * ng_iface_output().
  435  */
  436 static int
  437 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
  438 {
  439         struct rm_priotracker priv_tracker;
  440         const priv_p priv = (priv_p) ifp->if_softc;
  441         const iffam_p iffam = get_iffam_from_af(sa);
  442         hook_p hook;
  443         int error;
  444         int len;
  445 
  446         /* Check address family to determine hook (if known) */
  447         if (iffam == NULL) {
  448                 m_freem(m);
  449                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
  450                 return (EAFNOSUPPORT);
  451         }
  452 
  453         /* Copy length before the mbuf gets invalidated. */
  454         len = m->m_pkthdr.len;
  455 
  456         PRIV_RLOCK(priv, &priv_tracker);
  457         hook = *get_hook_from_iffam(priv, iffam);
  458         if (hook == NULL) {
  459                 NG_FREE_M(m);
  460                 PRIV_RUNLOCK(priv, &priv_tracker);
  461                 return ENETDOWN;
  462         }
  463         NG_HOOK_REF(hook);
  464         PRIV_RUNLOCK(priv, &priv_tracker);
  465 
  466         NG_OUTBOUND_THREAD_REF();
  467         NG_SEND_DATA_ONLY(error, hook, m);
  468         NG_OUTBOUND_THREAD_UNREF();
  469         NG_HOOK_UNREF(hook);
  470 
  471         /* Update stats. */
  472         if (error == 0) {
  473                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
  474                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  475         }
  476 
  477         return (error);
  478 }
  479 
  480 #ifdef DEBUG
  481 /*
  482  * Display an ioctl to the virtual interface
  483  */
  484 
  485 static void
  486 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  487 {
  488         char   *str;
  489 
  490         switch (command & IOC_DIRMASK) {
  491         case IOC_VOID:
  492                 str = "IO";
  493                 break;
  494         case IOC_OUT:
  495                 str = "IOR";
  496                 break;
  497         case IOC_IN:
  498                 str = "IOW";
  499                 break;
  500         case IOC_INOUT:
  501                 str = "IORW";
  502                 break;
  503         default:
  504                 str = "IO??";
  505         }
  506         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  507                ifp->if_xname,
  508                str,
  509                IOCGROUP(command),
  510                command & 0xff,
  511                IOCPARM_LEN(command));
  512 }
  513 #endif /* DEBUG */
  514 
  515 /************************************************************************
  516                         NETGRAPH NODE STUFF
  517  ************************************************************************/
  518 
  519 /*
  520  * Constructor for a node
  521  */
  522 static int
  523 ng_iface_constructor(node_p node)
  524 {
  525         struct ifnet *ifp;
  526         priv_p priv;
  527 
  528         /* Allocate node and interface private structures */
  529         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
  530         ifp = if_alloc(IFT_PROPVIRTUAL);
  531         if (ifp == NULL) {
  532                 free(priv, M_NETGRAPH_IFACE);
  533                 return (ENOMEM);
  534         }
  535 
  536         rm_init(&priv->lock, "ng_iface private rmlock");
  537 
  538         /* Link them together */
  539         ifp->if_softc = priv;
  540         priv->ifp = ifp;
  541 
  542         /* Get an interface unit number */
  543         priv->unit = alloc_unr(V_ng_iface_unit);
  544 
  545         /* Link together node and private info */
  546         NG_NODE_SET_PRIVATE(node, priv);
  547         priv->node = node;
  548 
  549         /* Initialize interface structure */
  550         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
  551         ifp->if_output = ng_iface_output;
  552         ifp->if_start = ng_iface_start;
  553         ifp->if_ioctl = ng_iface_ioctl;
  554         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
  555         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
  556         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
  557         ifp->if_addrlen = 0;                    /* XXX */
  558         ifp->if_hdrlen = 0;                     /* XXX */
  559         ifp->if_baudrate = 64000;               /* XXX */
  560         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  561         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  562         IFQ_SET_READY(&ifp->if_snd);
  563 
  564         /* Give this node the same name as the interface (if possible) */
  565         if (ng_name_node(node, ifp->if_xname) != 0)
  566                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  567                     ifp->if_xname);
  568 
  569         /* Attach the interface */
  570         if_attach(ifp);
  571         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  572 
  573         /* Done */
  574         return (0);
  575 }
  576 
  577 /*
  578  * Give our ok for a hook to be added
  579  */
  580 static int
  581 ng_iface_newhook(node_p node, hook_p hook, const char *name)
  582 {
  583         const iffam_p iffam = get_iffam_from_name(name);
  584         const priv_p priv = NG_NODE_PRIVATE(node);
  585         hook_p *hookptr;
  586 
  587         if (iffam == NULL)
  588                 return (EPFNOSUPPORT);
  589         PRIV_WLOCK(priv);
  590         hookptr = get_hook_from_iffam(priv, iffam);
  591         if (*hookptr != NULL) {
  592                 PRIV_WUNLOCK(priv);
  593                 return (EISCONN);
  594         }
  595         *hookptr = hook;
  596         NG_HOOK_HI_STACK(hook);
  597         NG_HOOK_SET_TO_INBOUND(hook);
  598         PRIV_WUNLOCK(priv);
  599         return (0);
  600 }
  601 
  602 /*
  603  * Receive a control message
  604  */
  605 static int
  606 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  607 {
  608         const priv_p priv = NG_NODE_PRIVATE(node);
  609         struct ifnet *const ifp = priv->ifp;
  610         struct ng_mesg *resp = NULL;
  611         int error = 0;
  612         struct ng_mesg *msg;
  613 
  614         NGI_GET_MSG(item, msg);
  615         switch (msg->header.typecookie) {
  616         case NGM_IFACE_COOKIE:
  617                 switch (msg->header.cmd) {
  618                 case NGM_IFACE_GET_IFNAME:
  619                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  620                         if (resp == NULL) {
  621                                 error = ENOMEM;
  622                                 break;
  623                         }
  624                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  625                         break;
  626 
  627                 case NGM_IFACE_POINT2POINT:
  628                 case NGM_IFACE_BROADCAST:
  629                     {
  630 
  631                         /* Deny request if interface is UP */
  632                         if ((ifp->if_flags & IFF_UP) != 0)
  633                                 return (EBUSY);
  634 
  635                         /* Change flags */
  636                         switch (msg->header.cmd) {
  637                         case NGM_IFACE_POINT2POINT:
  638                                 ifp->if_flags |= IFF_POINTOPOINT;
  639                                 ifp->if_flags &= ~IFF_BROADCAST;
  640                                 break;
  641                         case NGM_IFACE_BROADCAST:
  642                                 ifp->if_flags &= ~IFF_POINTOPOINT;
  643                                 ifp->if_flags |= IFF_BROADCAST;
  644                                 break;
  645                         }
  646                         break;
  647                     }
  648 
  649                 case NGM_IFACE_GET_IFINDEX:
  650                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
  651                         if (resp == NULL) {
  652                                 error = ENOMEM;
  653                                 break;
  654                         }
  655                         *((uint32_t *)resp->data) = priv->ifp->if_index;
  656                         break;
  657 
  658                 default:
  659                         error = EINVAL;
  660                         break;
  661                 }
  662                 break;
  663         case NGM_FLOW_COOKIE:
  664                 switch (msg->header.cmd) {
  665                 case NGM_LINK_IS_UP:
  666                         if_link_state_change(ifp, LINK_STATE_UP);
  667                         break;
  668                 case NGM_LINK_IS_DOWN:
  669                         if_link_state_change(ifp, LINK_STATE_DOWN);
  670                         break;
  671                 default:
  672                         break;
  673                 }
  674                 break;
  675         default:
  676                 error = EINVAL;
  677                 break;
  678         }
  679         NG_RESPOND_MSG(error, node, item, resp);
  680         NG_FREE_MSG(msg);
  681         return (error);
  682 }
  683 
  684 /*
  685  * Recive data from a hook. Pass the packet to the correct input routine.
  686  */
  687 static int
  688 ng_iface_rcvdata(hook_p hook, item_p item)
  689 {
  690         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  691         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  692         struct ifnet *const ifp = priv->ifp;
  693         struct mbuf *m;
  694         int isr;
  695 
  696         NGI_GET_M(item, m);
  697         NG_FREE_ITEM(item);
  698         /* Sanity checks */
  699         KASSERT(iffam != NULL, ("%s: iffam", __func__));
  700         M_ASSERTPKTHDR(m);
  701         if ((ifp->if_flags & IFF_UP) == 0) {
  702                 NG_FREE_M(m);
  703                 return (ENETDOWN);
  704         }
  705 
  706         /* Update interface stats */
  707         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  708         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  709 
  710         /* Note receiving interface */
  711         m->m_pkthdr.rcvif = ifp;
  712 
  713         /* Berkeley packet filter */
  714         ng_iface_bpftap(ifp, m, iffam->family);
  715 
  716         /* Send packet */
  717         switch (iffam->family) {
  718 #ifdef INET
  719         case AF_INET:
  720                 isr = NETISR_IP;
  721                 break;
  722 #endif
  723 #ifdef INET6
  724         case AF_INET6:
  725                 isr = NETISR_IPV6;
  726                 break;
  727 #endif
  728         default:
  729                 m_freem(m);
  730                 return (EAFNOSUPPORT);
  731         }
  732         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
  733         M_SETFIB(m, ifp->if_fib);
  734         netisr_dispatch(isr, m);
  735         return (0);
  736 }
  737 
  738 /*
  739  * Shutdown and remove the node and its associated interface.
  740  */
  741 static int
  742 ng_iface_shutdown(node_p node)
  743 {
  744         const priv_p priv = NG_NODE_PRIVATE(node);
  745 
  746         /*
  747          * The ifnet may be in a different vnet than the netgraph node, 
  748          * hence we have to change the current vnet context here.
  749          */
  750         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  751         bpfdetach(priv->ifp);
  752         if_detach(priv->ifp);
  753         if_free(priv->ifp);
  754         CURVNET_RESTORE();
  755         priv->ifp = NULL;
  756         free_unr(V_ng_iface_unit, priv->unit);
  757         rm_destroy(&priv->lock);
  758         free(priv, M_NETGRAPH_IFACE);
  759         NG_NODE_SET_PRIVATE(node, NULL);
  760         NG_NODE_UNREF(node);
  761         return (0);
  762 }
  763 
  764 /*
  765  * Hook disconnection. Note that we do *not* shutdown when all
  766  * hooks have been disconnected.
  767  */
  768 static int
  769 ng_iface_disconnect(hook_p hook)
  770 {
  771         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  772         const iffam_p iffam = get_iffam_from_hook(priv, hook);
  773 
  774         if (iffam == NULL)
  775                 panic("%s", __func__);
  776         PRIV_WLOCK(priv);
  777         *get_hook_from_iffam(priv, iffam) = NULL;
  778         PRIV_WUNLOCK(priv);
  779         return (0);
  780 }
  781 
  782 /*
  783  * Handle loading and unloading for this node type.
  784  */
  785 static int
  786 ng_iface_mod_event(module_t mod, int event, void *data)
  787 {
  788         int error = 0;
  789 
  790         switch (event) {
  791         case MOD_LOAD:
  792         case MOD_UNLOAD:
  793                 break;
  794         default:
  795                 error = EOPNOTSUPP;
  796                 break;
  797         }
  798         return (error);
  799 }
  800 
  801 static void
  802 vnet_ng_iface_init(const void *unused)
  803 {
  804 
  805         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
  806 }
  807 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  808     vnet_ng_iface_init, NULL);
  809 
  810 static void
  811 vnet_ng_iface_uninit(const void *unused)
  812 {
  813 
  814         delete_unrhdr(V_ng_iface_unit);
  815 }
  816 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  817     vnet_ng_iface_uninit, NULL);

Cache object: e1f52736bbbd94464eb70750db0f70f0


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.