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


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FreeBSD/Linux Kernel Cross Reference
sys/net/rtsock.c

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    1 /*-
    2  * Copyright (c) 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)rtsock.c    8.7 (Berkeley) 10/12/95
   30  * $FreeBSD$
   31  */
   32 #include "opt_compat.h"
   33 #include "opt_mpath.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/jail.h>
   39 #include <sys/kernel.h>
   40 #include <sys/domain.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/priv.h>
   45 #include <sys/proc.h>
   46 #include <sys/protosw.h>
   47 #include <sys/rwlock.h>
   48 #include <sys/signalvar.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/systm.h>
   53 
   54 #include <net/if.h>
   55 #include <net/if_var.h>
   56 #include <net/if_dl.h>
   57 #include <net/if_llatbl.h>
   58 #include <net/if_types.h>
   59 #include <net/netisr.h>
   60 #include <net/raw_cb.h>
   61 #include <net/route.h>
   62 #include <net/route_var.h>
   63 #include <net/vnet.h>
   64 
   65 #include <netinet/in.h>
   66 #include <netinet/if_ether.h>
   67 #include <netinet/ip_carp.h>
   68 #ifdef INET6
   69 #include <netinet6/ip6_var.h>
   70 #include <netinet6/scope6_var.h>
   71 #endif
   72 
   73 #ifdef COMPAT_FREEBSD32
   74 #include <sys/mount.h>
   75 #include <compat/freebsd32/freebsd32.h>
   76 
   77 struct if_msghdr32 {
   78         uint16_t ifm_msglen;
   79         uint8_t ifm_version;
   80         uint8_t ifm_type;
   81         int32_t ifm_addrs;
   82         int32_t ifm_flags;
   83         uint16_t ifm_index;
   84         uint16_t _ifm_spare1;
   85         struct  if_data ifm_data;
   86 };
   87 
   88 struct if_msghdrl32 {
   89         uint16_t ifm_msglen;
   90         uint8_t ifm_version;
   91         uint8_t ifm_type;
   92         int32_t ifm_addrs;
   93         int32_t ifm_flags;
   94         uint16_t ifm_index;
   95         uint16_t _ifm_spare1;
   96         uint16_t ifm_len;
   97         uint16_t ifm_data_off;
   98         uint32_t _ifm_spare2;
   99         struct  if_data ifm_data;
  100 };
  101 
  102 struct ifa_msghdrl32 {
  103         uint16_t ifam_msglen;
  104         uint8_t ifam_version;
  105         uint8_t ifam_type;
  106         int32_t ifam_addrs;
  107         int32_t ifam_flags;
  108         uint16_t ifam_index;
  109         uint16_t _ifam_spare1;
  110         uint16_t ifam_len;
  111         uint16_t ifam_data_off;
  112         int32_t ifam_metric;
  113         struct  if_data ifam_data;
  114 };
  115 
  116 #define SA_SIZE32(sa)                                           \
  117     (  (((struct sockaddr *)(sa))->sa_len == 0) ?               \
  118         sizeof(int)             :                               \
  119         1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(int) - 1) ) )
  120 
  121 #endif /* COMPAT_FREEBSD32 */
  122 
  123 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
  124 
  125 /* NB: these are not modified */
  126 static struct   sockaddr route_src = { 2, PF_ROUTE, };
  127 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
  128 
  129 /* These are external hooks for CARP. */
  130 int     (*carp_get_vhid_p)(struct ifaddr *);
  131 
  132 /*
  133  * Used by rtsock/raw_input callback code to decide whether to filter the update
  134  * notification to a socket bound to a particular FIB.
  135  */
  136 #define RTS_FILTER_FIB  M_PROTO8
  137 
  138 typedef struct {
  139         int     ip_count;       /* attached w/ AF_INET */
  140         int     ip6_count;      /* attached w/ AF_INET6 */
  141         int     any_count;      /* total attached */
  142 } route_cb_t;
  143 static VNET_DEFINE(route_cb_t, route_cb);
  144 #define V_route_cb VNET(route_cb)
  145 
  146 struct mtx rtsock_mtx;
  147 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
  148 
  149 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
  150 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
  151 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
  152 
  153 static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
  154 
  155 struct walkarg {
  156         int     w_tmemsize;
  157         int     w_op, w_arg;
  158         caddr_t w_tmem;
  159         struct sysctl_req *w_req;
  160 };
  161 
  162 static void     rts_input(struct mbuf *m);
  163 static struct mbuf *rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo);
  164 static int      rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo,
  165                         struct walkarg *w, int *plen);
  166 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
  167                         struct rt_addrinfo *rtinfo);
  168 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
  169 static int      sysctl_iflist(int af, struct walkarg *w);
  170 static int      sysctl_ifmalist(int af, struct walkarg *w);
  171 static int      route_output(struct mbuf *m, struct socket *so, ...);
  172 static void     rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
  173 static void     rt_dispatch(struct mbuf *, sa_family_t);
  174 static struct sockaddr  *rtsock_fix_netmask(struct sockaddr *dst,
  175                         struct sockaddr *smask, struct sockaddr_storage *dmask);
  176 
  177 static struct netisr_handler rtsock_nh = {
  178         .nh_name = "rtsock",
  179         .nh_handler = rts_input,
  180         .nh_proto = NETISR_ROUTE,
  181         .nh_policy = NETISR_POLICY_SOURCE,
  182 };
  183 
  184 static int
  185 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
  186 {
  187         int error, qlimit;
  188 
  189         netisr_getqlimit(&rtsock_nh, &qlimit);
  190         error = sysctl_handle_int(oidp, &qlimit, 0, req);
  191         if (error || !req->newptr)
  192                 return (error);
  193         if (qlimit < 1)
  194                 return (EINVAL);
  195         return (netisr_setqlimit(&rtsock_nh, qlimit));
  196 }
  197 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
  198     0, 0, sysctl_route_netisr_maxqlen, "I",
  199     "maximum routing socket dispatch queue length");
  200 
  201 static void
  202 vnet_rts_init(void)
  203 {
  204         int tmp;
  205 
  206         if (IS_DEFAULT_VNET(curvnet)) {
  207                 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
  208                         rtsock_nh.nh_qlimit = tmp;
  209                 netisr_register(&rtsock_nh);
  210         }
  211 #ifdef VIMAGE
  212          else
  213                 netisr_register_vnet(&rtsock_nh);
  214 #endif
  215 }
  216 VNET_SYSINIT(vnet_rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
  217     vnet_rts_init, 0);
  218 
  219 #ifdef VIMAGE
  220 static void
  221 vnet_rts_uninit(void)
  222 {
  223 
  224         netisr_unregister_vnet(&rtsock_nh);
  225 }
  226 VNET_SYSUNINIT(vnet_rts_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
  227     vnet_rts_uninit, 0);
  228 #endif
  229 
  230 static int
  231 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
  232     struct rawcb *rp)
  233 {
  234         int fibnum;
  235 
  236         KASSERT(m != NULL, ("%s: m is NULL", __func__));
  237         KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
  238         KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
  239 
  240         /* No filtering requested. */
  241         if ((m->m_flags & RTS_FILTER_FIB) == 0)
  242                 return (0);
  243 
  244         /* Check if it is a rts and the fib matches the one of the socket. */
  245         fibnum = M_GETFIB(m);
  246         if (proto->sp_family != PF_ROUTE ||
  247             rp->rcb_socket == NULL ||
  248             rp->rcb_socket->so_fibnum == fibnum)
  249                 return (0);
  250 
  251         /* Filtering requested and no match, the socket shall be skipped. */
  252         return (1);
  253 }
  254 
  255 static void
  256 rts_input(struct mbuf *m)
  257 {
  258         struct sockproto route_proto;
  259         unsigned short *family;
  260         struct m_tag *tag;
  261 
  262         route_proto.sp_family = PF_ROUTE;
  263         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
  264         if (tag != NULL) {
  265                 family = (unsigned short *)(tag + 1);
  266                 route_proto.sp_protocol = *family;
  267                 m_tag_delete(m, tag);
  268         } else
  269                 route_proto.sp_protocol = 0;
  270 
  271         raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
  272 }
  273 
  274 /*
  275  * It really doesn't make any sense at all for this code to share much
  276  * with raw_usrreq.c, since its functionality is so restricted.  XXX
  277  */
  278 static void
  279 rts_abort(struct socket *so)
  280 {
  281 
  282         raw_usrreqs.pru_abort(so);
  283 }
  284 
  285 static void
  286 rts_close(struct socket *so)
  287 {
  288 
  289         raw_usrreqs.pru_close(so);
  290 }
  291 
  292 /* pru_accept is EOPNOTSUPP */
  293 
  294 static int
  295 rts_attach(struct socket *so, int proto, struct thread *td)
  296 {
  297         struct rawcb *rp;
  298         int error;
  299 
  300         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
  301 
  302         /* XXX */
  303         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
  304 
  305         so->so_pcb = (caddr_t)rp;
  306         so->so_fibnum = td->td_proc->p_fibnum;
  307         error = raw_attach(so, proto);
  308         rp = sotorawcb(so);
  309         if (error) {
  310                 so->so_pcb = NULL;
  311                 free(rp, M_PCB);
  312                 return error;
  313         }
  314         RTSOCK_LOCK();
  315         switch(rp->rcb_proto.sp_protocol) {
  316         case AF_INET:
  317                 V_route_cb.ip_count++;
  318                 break;
  319         case AF_INET6:
  320                 V_route_cb.ip6_count++;
  321                 break;
  322         }
  323         V_route_cb.any_count++;
  324         RTSOCK_UNLOCK();
  325         soisconnected(so);
  326         so->so_options |= SO_USELOOPBACK;
  327         return 0;
  328 }
  329 
  330 static int
  331 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  332 {
  333 
  334         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
  335 }
  336 
  337 static int
  338 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  339 {
  340 
  341         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
  342 }
  343 
  344 /* pru_connect2 is EOPNOTSUPP */
  345 /* pru_control is EOPNOTSUPP */
  346 
  347 static void
  348 rts_detach(struct socket *so)
  349 {
  350         struct rawcb *rp = sotorawcb(so);
  351 
  352         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
  353 
  354         RTSOCK_LOCK();
  355         switch(rp->rcb_proto.sp_protocol) {
  356         case AF_INET:
  357                 V_route_cb.ip_count--;
  358                 break;
  359         case AF_INET6:
  360                 V_route_cb.ip6_count--;
  361                 break;
  362         }
  363         V_route_cb.any_count--;
  364         RTSOCK_UNLOCK();
  365         raw_usrreqs.pru_detach(so);
  366 }
  367 
  368 static int
  369 rts_disconnect(struct socket *so)
  370 {
  371 
  372         return (raw_usrreqs.pru_disconnect(so));
  373 }
  374 
  375 /* pru_listen is EOPNOTSUPP */
  376 
  377 static int
  378 rts_peeraddr(struct socket *so, struct sockaddr **nam)
  379 {
  380 
  381         return (raw_usrreqs.pru_peeraddr(so, nam));
  382 }
  383 
  384 /* pru_rcvd is EOPNOTSUPP */
  385 /* pru_rcvoob is EOPNOTSUPP */
  386 
  387 static int
  388 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  389          struct mbuf *control, struct thread *td)
  390 {
  391 
  392         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
  393 }
  394 
  395 /* pru_sense is null */
  396 
  397 static int
  398 rts_shutdown(struct socket *so)
  399 {
  400 
  401         return (raw_usrreqs.pru_shutdown(so));
  402 }
  403 
  404 static int
  405 rts_sockaddr(struct socket *so, struct sockaddr **nam)
  406 {
  407 
  408         return (raw_usrreqs.pru_sockaddr(so, nam));
  409 }
  410 
  411 static struct pr_usrreqs route_usrreqs = {
  412         .pru_abort =            rts_abort,
  413         .pru_attach =           rts_attach,
  414         .pru_bind =             rts_bind,
  415         .pru_connect =          rts_connect,
  416         .pru_detach =           rts_detach,
  417         .pru_disconnect =       rts_disconnect,
  418         .pru_peeraddr =         rts_peeraddr,
  419         .pru_send =             rts_send,
  420         .pru_shutdown =         rts_shutdown,
  421         .pru_sockaddr =         rts_sockaddr,
  422         .pru_close =            rts_close,
  423 };
  424 
  425 #ifndef _SOCKADDR_UNION_DEFINED
  426 #define _SOCKADDR_UNION_DEFINED
  427 /*
  428  * The union of all possible address formats we handle.
  429  */
  430 union sockaddr_union {
  431         struct sockaddr         sa;
  432         struct sockaddr_in      sin;
  433         struct sockaddr_in6     sin6;
  434 };
  435 #endif /* _SOCKADDR_UNION_DEFINED */
  436 
  437 static int
  438 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
  439     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
  440 {
  441 
  442         /* First, see if the returned address is part of the jail. */
  443         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
  444                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  445                 return (0);
  446         }
  447 
  448         switch (info->rti_info[RTAX_DST]->sa_family) {
  449 #ifdef INET
  450         case AF_INET:
  451         {
  452                 struct in_addr ia;
  453                 struct ifaddr *ifa;
  454                 int found;
  455 
  456                 found = 0;
  457                 /*
  458                  * Try to find an address on the given outgoing interface
  459                  * that belongs to the jail.
  460                  */
  461                 IF_ADDR_RLOCK(ifp);
  462                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  463                         struct sockaddr *sa;
  464                         sa = ifa->ifa_addr;
  465                         if (sa->sa_family != AF_INET)
  466                                 continue;
  467                         ia = ((struct sockaddr_in *)sa)->sin_addr;
  468                         if (prison_check_ip4(cred, &ia) == 0) {
  469                                 found = 1;
  470                                 break;
  471                         }
  472                 }
  473                 IF_ADDR_RUNLOCK(ifp);
  474                 if (!found) {
  475                         /*
  476                          * As a last resort return the 'default' jail address.
  477                          */
  478                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
  479                             sin_addr;
  480                         if (prison_get_ip4(cred, &ia) != 0)
  481                                 return (ESRCH);
  482                 }
  483                 bzero(&saun->sin, sizeof(struct sockaddr_in));
  484                 saun->sin.sin_len = sizeof(struct sockaddr_in);
  485                 saun->sin.sin_family = AF_INET;
  486                 saun->sin.sin_addr.s_addr = ia.s_addr;
  487                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
  488                 break;
  489         }
  490 #endif
  491 #ifdef INET6
  492         case AF_INET6:
  493         {
  494                 struct in6_addr ia6;
  495                 struct ifaddr *ifa;
  496                 int found;
  497 
  498                 found = 0;
  499                 /*
  500                  * Try to find an address on the given outgoing interface
  501                  * that belongs to the jail.
  502                  */
  503                 IF_ADDR_RLOCK(ifp);
  504                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  505                         struct sockaddr *sa;
  506                         sa = ifa->ifa_addr;
  507                         if (sa->sa_family != AF_INET6)
  508                                 continue;
  509                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
  510                             &ia6, sizeof(struct in6_addr));
  511                         if (prison_check_ip6(cred, &ia6) == 0) {
  512                                 found = 1;
  513                                 break;
  514                         }
  515                 }
  516                 IF_ADDR_RUNLOCK(ifp);
  517                 if (!found) {
  518                         /*
  519                          * As a last resort return the 'default' jail address.
  520                          */
  521                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
  522                             sin6_addr;
  523                         if (prison_get_ip6(cred, &ia6) != 0)
  524                                 return (ESRCH);
  525                 }
  526                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
  527                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
  528                 saun->sin6.sin6_family = AF_INET6;
  529                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
  530                 if (sa6_recoverscope(&saun->sin6) != 0)
  531                         return (ESRCH);
  532                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
  533                 break;
  534         }
  535 #endif
  536         default:
  537                 return (ESRCH);
  538         }
  539         return (0);
  540 }
  541 
  542 /*ARGSUSED*/
  543 static int
  544 route_output(struct mbuf *m, struct socket *so, ...)
  545 {
  546         struct rt_msghdr *rtm = NULL;
  547         struct rtentry *rt = NULL;
  548         struct rib_head *rnh;
  549         struct rt_addrinfo info;
  550         struct sockaddr_storage ss;
  551 #ifdef INET6
  552         struct sockaddr_in6 *sin6;
  553         int i, rti_need_deembed = 0;
  554 #endif
  555         int alloc_len = 0, len, error = 0, fibnum;
  556         struct ifnet *ifp = NULL;
  557         union sockaddr_union saun;
  558         sa_family_t saf = AF_UNSPEC;
  559         struct rawcb *rp = NULL;
  560         struct walkarg w;
  561 
  562         fibnum = so->so_fibnum;
  563 
  564 #define senderr(e) { error = e; goto flush;}
  565         if (m == NULL || ((m->m_len < sizeof(long)) &&
  566                        (m = m_pullup(m, sizeof(long))) == NULL))
  567                 return (ENOBUFS);
  568         if ((m->m_flags & M_PKTHDR) == 0)
  569                 panic("route_output");
  570         len = m->m_pkthdr.len;
  571         if (len < sizeof(*rtm) ||
  572             len != mtod(m, struct rt_msghdr *)->rtm_msglen)
  573                 senderr(EINVAL);
  574 
  575         /*
  576          * Most of current messages are in range 200-240 bytes,
  577          * minimize possible re-allocation on reply using larger size
  578          * buffer aligned on 1k boundaty.
  579          */
  580         alloc_len = roundup2(len, 1024);
  581         if ((rtm = malloc(alloc_len, M_TEMP, M_NOWAIT)) == NULL)
  582                 senderr(ENOBUFS);
  583 
  584         m_copydata(m, 0, len, (caddr_t)rtm);
  585         bzero(&info, sizeof(info));
  586         bzero(&w, sizeof(w));
  587 
  588         if (rtm->rtm_version != RTM_VERSION) {
  589                 /* Do not touch message since format is unknown */
  590                 free(rtm, M_TEMP);
  591                 rtm = NULL;
  592                 senderr(EPROTONOSUPPORT);
  593         }
  594 
  595         /*
  596          * Starting from here, it is possible
  597          * to alter original message and insert
  598          * caller PID and error value.
  599          */
  600 
  601         rtm->rtm_pid = curproc->p_pid;
  602         info.rti_addrs = rtm->rtm_addrs;
  603 
  604         info.rti_mflags = rtm->rtm_inits;
  605         info.rti_rmx = &rtm->rtm_rmx;
  606 
  607         /*
  608          * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
  609          * link-local address because rtrequest requires addresses with
  610          * embedded scope id.
  611          */
  612         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info))
  613                 senderr(EINVAL);
  614 
  615         info.rti_flags = rtm->rtm_flags;
  616         if (info.rti_info[RTAX_DST] == NULL ||
  617             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
  618             (info.rti_info[RTAX_GATEWAY] != NULL &&
  619              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
  620                 senderr(EINVAL);
  621         saf = info.rti_info[RTAX_DST]->sa_family;
  622         /*
  623          * Verify that the caller has the appropriate privilege; RTM_GET
  624          * is the only operation the non-superuser is allowed.
  625          */
  626         if (rtm->rtm_type != RTM_GET) {
  627                 error = priv_check(curthread, PRIV_NET_ROUTE);
  628                 if (error)
  629                         senderr(error);
  630         }
  631 
  632         /*
  633          * The given gateway address may be an interface address.
  634          * For example, issuing a "route change" command on a route
  635          * entry that was created from a tunnel, and the gateway
  636          * address given is the local end point. In this case the 
  637          * RTF_GATEWAY flag must be cleared or the destination will
  638          * not be reachable even though there is no error message.
  639          */
  640         if (info.rti_info[RTAX_GATEWAY] != NULL &&
  641             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
  642                 struct rt_addrinfo ginfo;
  643                 struct sockaddr *gdst;
  644 
  645                 bzero(&ginfo, sizeof(ginfo));
  646                 bzero(&ss, sizeof(ss));
  647                 ss.ss_len = sizeof(ss);
  648 
  649                 ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
  650                 gdst = info.rti_info[RTAX_GATEWAY];
  651 
  652                 /* 
  653                  * A host route through the loopback interface is 
  654                  * installed for each interface adddress. In pre 8.0
  655                  * releases the interface address of a PPP link type
  656                  * is not reachable locally. This behavior is fixed as 
  657                  * part of the new L2/L3 redesign and rewrite work. The
  658                  * signature of this interface address route is the
  659                  * AF_LINK sa_family type of the rt_gateway, and the
  660                  * rt_ifp has the IFF_LOOPBACK flag set.
  661                  */
  662                 if (rib_lookup_info(fibnum, gdst, NHR_REF, 0, &ginfo) == 0) {
  663                         if (ss.ss_family == AF_LINK &&
  664                             ginfo.rti_ifp->if_flags & IFF_LOOPBACK) {
  665                                 info.rti_flags &= ~RTF_GATEWAY;
  666                                 info.rti_flags |= RTF_GWFLAG_COMPAT;
  667                         }
  668                         rib_free_info(&ginfo);
  669                 }
  670         }
  671 
  672         switch (rtm->rtm_type) {
  673                 struct rtentry *saved_nrt;
  674 
  675         case RTM_ADD:
  676         case RTM_CHANGE:
  677                 if (info.rti_info[RTAX_GATEWAY] == NULL)
  678                         senderr(EINVAL);
  679                 saved_nrt = NULL;
  680 
  681                 /* support for new ARP code */
  682                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
  683                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
  684                         error = lla_rt_output(rtm, &info);
  685 #ifdef INET6
  686                         if (error == 0)
  687                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  688 #endif
  689                         break;
  690                 }
  691                 error = rtrequest1_fib(rtm->rtm_type, &info, &saved_nrt,
  692                     fibnum);
  693                 if (error == 0 && saved_nrt != NULL) {
  694 #ifdef INET6
  695                         rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  696 #endif
  697                         RT_LOCK(saved_nrt);
  698                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
  699                         RT_REMREF(saved_nrt);
  700                         RT_UNLOCK(saved_nrt);
  701                 }
  702                 break;
  703 
  704         case RTM_DELETE:
  705                 saved_nrt = NULL;
  706                 /* support for new ARP code */
  707                 if (info.rti_info[RTAX_GATEWAY] && 
  708                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
  709                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
  710                         error = lla_rt_output(rtm, &info);
  711 #ifdef INET6
  712                         if (error == 0)
  713                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  714 #endif
  715                         break;
  716                 }
  717                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, fibnum);
  718                 if (error == 0) {
  719                         RT_LOCK(saved_nrt);
  720                         rt = saved_nrt;
  721                         goto report;
  722                 }
  723 #ifdef INET6
  724                 /* rt_msg2() will not be used when RTM_DELETE fails. */
  725                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  726 #endif
  727                 break;
  728 
  729         case RTM_GET:
  730                 rnh = rt_tables_get_rnh(fibnum, saf);
  731                 if (rnh == NULL)
  732                         senderr(EAFNOSUPPORT);
  733 
  734                 RIB_RLOCK(rnh);
  735 
  736                 if (info.rti_info[RTAX_NETMASK] == NULL &&
  737                     rtm->rtm_type == RTM_GET) {
  738                         /*
  739                          * Provide longest prefix match for
  740                          * address lookup (no mask).
  741                          * 'route -n get addr'
  742                          */
  743                         rt = (struct rtentry *) rnh->rnh_matchaddr(
  744                             info.rti_info[RTAX_DST], &rnh->head);
  745                 } else
  746                         rt = (struct rtentry *) rnh->rnh_lookup(
  747                             info.rti_info[RTAX_DST],
  748                             info.rti_info[RTAX_NETMASK], &rnh->head);
  749 
  750                 if (rt == NULL) {
  751                         RIB_RUNLOCK(rnh);
  752                         senderr(ESRCH);
  753                 }
  754 #ifdef RADIX_MPATH
  755                 /*
  756                  * for RTM_CHANGE/LOCK, if we got multipath routes,
  757                  * we require users to specify a matching RTAX_GATEWAY.
  758                  *
  759                  * for RTM_GET, gate is optional even with multipath.
  760                  * if gate == NULL the first match is returned.
  761                  * (no need to call rt_mpath_matchgate if gate == NULL)
  762                  */
  763                 if (rt_mpath_capable(rnh) &&
  764                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
  765                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
  766                         if (!rt) {
  767                                 RIB_RUNLOCK(rnh);
  768                                 senderr(ESRCH);
  769                         }
  770                 }
  771 #endif
  772                 /*
  773                  * If performing proxied L2 entry insertion, and
  774                  * the actual PPP host entry is found, perform
  775                  * another search to retrieve the prefix route of
  776                  * the local end point of the PPP link.
  777                  */
  778                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
  779                         struct sockaddr laddr;
  780 
  781                         if (rt->rt_ifp != NULL && 
  782                             rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
  783                                 struct ifaddr *ifa;
  784 
  785                                 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1,
  786                                                 RT_ALL_FIBS);
  787                                 if (ifa != NULL)
  788                                         rt_maskedcopy(ifa->ifa_addr,
  789                                                       &laddr,
  790                                                       ifa->ifa_netmask);
  791                         } else
  792                                 rt_maskedcopy(rt->rt_ifa->ifa_addr,
  793                                               &laddr,
  794                                               rt->rt_ifa->ifa_netmask);
  795                         /* 
  796                          * refactor rt and no lock operation necessary
  797                          */
  798                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr,
  799                             &rnh->head);
  800                         if (rt == NULL) {
  801                                 RIB_RUNLOCK(rnh);
  802                                 senderr(ESRCH);
  803                         }
  804                 } 
  805                 RT_LOCK(rt);
  806                 RT_ADDREF(rt);
  807                 RIB_RUNLOCK(rnh);
  808 
  809 report:
  810                 RT_LOCK_ASSERT(rt);
  811                 if ((rt->rt_flags & RTF_HOST) == 0
  812                     ? jailed_without_vnet(curthread->td_ucred)
  813                     : prison_if(curthread->td_ucred,
  814                     rt_key(rt)) != 0) {
  815                         RT_UNLOCK(rt);
  816                         senderr(ESRCH);
  817                 }
  818                 info.rti_info[RTAX_DST] = rt_key(rt);
  819                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  820                 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
  821                     rt_mask(rt), &ss);
  822                 info.rti_info[RTAX_GENMASK] = 0;
  823                 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
  824                         ifp = rt->rt_ifp;
  825                         if (ifp) {
  826                                 info.rti_info[RTAX_IFP] =
  827                                     ifp->if_addr->ifa_addr;
  828                                 error = rtm_get_jailed(&info, ifp, rt,
  829                                     &saun, curthread->td_ucred);
  830                                 if (error != 0) {
  831                                         RT_UNLOCK(rt);
  832                                         senderr(error);
  833                                 }
  834                                 if (ifp->if_flags & IFF_POINTOPOINT)
  835                                         info.rti_info[RTAX_BRD] =
  836                                             rt->rt_ifa->ifa_dstaddr;
  837                                 rtm->rtm_index = ifp->if_index;
  838                         } else {
  839                                 info.rti_info[RTAX_IFP] = NULL;
  840                                 info.rti_info[RTAX_IFA] = NULL;
  841                         }
  842                 } else if ((ifp = rt->rt_ifp) != NULL) {
  843                         rtm->rtm_index = ifp->if_index;
  844                 }
  845 
  846                 /* Check if we need to realloc storage */
  847                 rtsock_msg_buffer(rtm->rtm_type, &info, NULL, &len);
  848                 if (len > alloc_len) {
  849                         struct rt_msghdr *new_rtm;
  850                         new_rtm = malloc(len, M_TEMP, M_NOWAIT);
  851                         if (new_rtm == NULL) {
  852                                 RT_UNLOCK(rt);
  853                                 senderr(ENOBUFS);
  854                         }
  855                         bcopy(rtm, new_rtm, rtm->rtm_msglen);
  856                         free(rtm, M_TEMP);
  857                         rtm = new_rtm;
  858                         alloc_len = len;
  859                 }
  860 
  861                 w.w_tmem = (caddr_t)rtm;
  862                 w.w_tmemsize = alloc_len;
  863                 rtsock_msg_buffer(rtm->rtm_type, &info, &w, &len);
  864 
  865                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
  866                         rtm->rtm_flags = RTF_GATEWAY | 
  867                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
  868                 else
  869                         rtm->rtm_flags = rt->rt_flags;
  870                 rt_getmetrics(rt, &rtm->rtm_rmx);
  871                 rtm->rtm_addrs = info.rti_addrs;
  872 
  873                 RT_UNLOCK(rt);
  874                 break;
  875 
  876         default:
  877                 senderr(EOPNOTSUPP);
  878         }
  879 
  880 flush:
  881         if (rt != NULL)
  882                 RTFREE(rt);
  883         /*
  884          * Check to see if we don't want our own messages.
  885          */
  886         if ((so->so_options & SO_USELOOPBACK) == 0) {
  887                 if (V_route_cb.any_count <= 1) {
  888                         if (rtm != NULL)
  889                                 free(rtm, M_TEMP);
  890                         m_freem(m);
  891                         return (error);
  892                 }
  893                 /* There is another listener, so construct message */
  894                 rp = sotorawcb(so);
  895         }
  896 
  897         if (rtm != NULL) {
  898 #ifdef INET6
  899                 if (rti_need_deembed) {
  900                         /* sin6_scope_id is recovered before sending rtm. */
  901                         sin6 = (struct sockaddr_in6 *)&ss;
  902                         for (i = 0; i < RTAX_MAX; i++) {
  903                                 if (info.rti_info[i] == NULL)
  904                                         continue;
  905                                 if (info.rti_info[i]->sa_family != AF_INET6)
  906                                         continue;
  907                                 bcopy(info.rti_info[i], sin6, sizeof(*sin6));
  908                                 if (sa6_recoverscope(sin6) == 0)
  909                                         bcopy(sin6, info.rti_info[i],
  910                                                     sizeof(*sin6));
  911                         }
  912                 }
  913 #endif
  914                 if (error != 0)
  915                         rtm->rtm_errno = error;
  916                 else
  917                         rtm->rtm_flags |= RTF_DONE;
  918 
  919                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
  920                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
  921                         m_freem(m);
  922                         m = NULL;
  923                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
  924                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
  925 
  926                 free(rtm, M_TEMP);
  927         }
  928         if (m != NULL) {
  929                 M_SETFIB(m, fibnum);
  930                 m->m_flags |= RTS_FILTER_FIB;
  931                 if (rp) {
  932                         /*
  933                          * XXX insure we don't get a copy by
  934                          * invalidating our protocol
  935                          */
  936                         unsigned short family = rp->rcb_proto.sp_family;
  937                         rp->rcb_proto.sp_family = 0;
  938                         rt_dispatch(m, saf);
  939                         rp->rcb_proto.sp_family = family;
  940                 } else
  941                         rt_dispatch(m, saf);
  942         }
  943 
  944         return (error);
  945 }
  946 
  947 static void
  948 rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
  949 {
  950 
  951         bzero(out, sizeof(*out));
  952         out->rmx_mtu = rt->rt_mtu;
  953         out->rmx_weight = rt->rt_weight;
  954         out->rmx_pksent = counter_u64_fetch(rt->rt_pksent);
  955         /* Kernel -> userland timebase conversion. */
  956         out->rmx_expire = rt->rt_expire ?
  957             rt->rt_expire - time_uptime + time_second : 0;
  958 }
  959 
  960 /*
  961  * Extract the addresses of the passed sockaddrs.
  962  * Do a little sanity checking so as to avoid bad memory references.
  963  * This data is derived straight from userland.
  964  */
  965 static int
  966 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
  967 {
  968         struct sockaddr *sa;
  969         int i;
  970 
  971         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
  972                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
  973                         continue;
  974                 sa = (struct sockaddr *)cp;
  975                 /*
  976                  * It won't fit.
  977                  */
  978                 if (cp + sa->sa_len > cplim)
  979                         return (EINVAL);
  980                 /*
  981                  * there are no more.. quit now
  982                  * If there are more bits, they are in error.
  983                  * I've seen this. route(1) can evidently generate these. 
  984                  * This causes kernel to core dump.
  985                  * for compatibility, If we see this, point to a safe address.
  986                  */
  987                 if (sa->sa_len == 0) {
  988                         rtinfo->rti_info[i] = &sa_zero;
  989                         return (0); /* should be EINVAL but for compat */
  990                 }
  991                 /* accept it */
  992 #ifdef INET6
  993                 if (sa->sa_family == AF_INET6)
  994                         sa6_embedscope((struct sockaddr_in6 *)sa,
  995                             V_ip6_use_defzone);
  996 #endif
  997                 rtinfo->rti_info[i] = sa;
  998                 cp += SA_SIZE(sa);
  999         }
 1000         return (0);
 1001 }
 1002 
 1003 /*
 1004  * Fill in @dmask with valid netmask leaving original @smask
 1005  * intact. Mostly used with radix netmasks.
 1006  */
 1007 static struct sockaddr *
 1008 rtsock_fix_netmask(struct sockaddr *dst, struct sockaddr *smask,
 1009     struct sockaddr_storage *dmask)
 1010 {
 1011         if (dst == NULL || smask == NULL)
 1012                 return (NULL);
 1013 
 1014         memset(dmask, 0, dst->sa_len);
 1015         memcpy(dmask, smask, smask->sa_len);
 1016         dmask->ss_len = dst->sa_len;
 1017         dmask->ss_family = dst->sa_family;
 1018 
 1019         return ((struct sockaddr *)dmask);
 1020 }
 1021 
 1022 /*
 1023  * Writes information related to @rtinfo object to newly-allocated mbuf.
 1024  * Assumes MCLBYTES is enough to construct any message.
 1025  * Used for OS notifications of vaious events (if/ifa announces,etc)
 1026  *
 1027  * Returns allocated mbuf or NULL on failure.
 1028  */
 1029 static struct mbuf *
 1030 rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
 1031 {
 1032         struct rt_msghdr *rtm;
 1033         struct mbuf *m;
 1034         int i;
 1035         struct sockaddr *sa;
 1036 #ifdef INET6
 1037         struct sockaddr_storage ss;
 1038         struct sockaddr_in6 *sin6;
 1039 #endif
 1040         int len, dlen;
 1041 
 1042         switch (type) {
 1043 
 1044         case RTM_DELADDR:
 1045         case RTM_NEWADDR:
 1046                 len = sizeof(struct ifa_msghdr);
 1047                 break;
 1048 
 1049         case RTM_DELMADDR:
 1050         case RTM_NEWMADDR:
 1051                 len = sizeof(struct ifma_msghdr);
 1052                 break;
 1053 
 1054         case RTM_IFINFO:
 1055                 len = sizeof(struct if_msghdr);
 1056                 break;
 1057 
 1058         case RTM_IFANNOUNCE:
 1059         case RTM_IEEE80211:
 1060                 len = sizeof(struct if_announcemsghdr);
 1061                 break;
 1062 
 1063         default:
 1064                 len = sizeof(struct rt_msghdr);
 1065         }
 1066 
 1067         /* XXXGL: can we use MJUMPAGESIZE cluster here? */
 1068         KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
 1069         if (len > MHLEN)
 1070                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 1071         else
 1072                 m = m_gethdr(M_NOWAIT, MT_DATA);
 1073         if (m == NULL)
 1074                 return (m);
 1075 
 1076         m->m_pkthdr.len = m->m_len = len;
 1077         rtm = mtod(m, struct rt_msghdr *);
 1078         bzero((caddr_t)rtm, len);
 1079         for (i = 0; i < RTAX_MAX; i++) {
 1080                 if ((sa = rtinfo->rti_info[i]) == NULL)
 1081                         continue;
 1082                 rtinfo->rti_addrs |= (1 << i);
 1083                 dlen = SA_SIZE(sa);
 1084 #ifdef INET6
 1085                 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
 1086                         sin6 = (struct sockaddr_in6 *)&ss;
 1087                         bcopy(sa, sin6, sizeof(*sin6));
 1088                         if (sa6_recoverscope(sin6) == 0)
 1089                                 sa = (struct sockaddr *)sin6;
 1090                 }
 1091 #endif
 1092                 m_copyback(m, len, dlen, (caddr_t)sa);
 1093                 len += dlen;
 1094         }
 1095         if (m->m_pkthdr.len != len) {
 1096                 m_freem(m);
 1097                 return (NULL);
 1098         }
 1099         rtm->rtm_msglen = len;
 1100         rtm->rtm_version = RTM_VERSION;
 1101         rtm->rtm_type = type;
 1102         return (m);
 1103 }
 1104 
 1105 /*
 1106  * Writes information related to @rtinfo object to preallocated buffer.
 1107  * Stores needed size in @plen. If @w is NULL, calculates size without
 1108  * writing.
 1109  * Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
 1110  *
 1111  * Returns 0 on success.
 1112  *
 1113  */
 1114 static int
 1115 rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
 1116 {
 1117         int i;
 1118         int len, buflen = 0, dlen;
 1119         caddr_t cp = NULL;
 1120         struct rt_msghdr *rtm = NULL;
 1121 #ifdef INET6
 1122         struct sockaddr_storage ss;
 1123         struct sockaddr_in6 *sin6;
 1124 #endif
 1125 #ifdef COMPAT_FREEBSD32
 1126         bool compat32 = false;
 1127 #endif
 1128 
 1129         switch (type) {
 1130 
 1131         case RTM_DELADDR:
 1132         case RTM_NEWADDR:
 1133                 if (w != NULL && w->w_op == NET_RT_IFLISTL) {
 1134 #ifdef COMPAT_FREEBSD32
 1135                         if (w->w_req->flags & SCTL_MASK32) {
 1136                                 len = sizeof(struct ifa_msghdrl32);
 1137                                 compat32 = true;
 1138                         } else
 1139 #endif
 1140                                 len = sizeof(struct ifa_msghdrl);
 1141                 } else
 1142                         len = sizeof(struct ifa_msghdr);
 1143                 break;
 1144 
 1145         case RTM_IFINFO:
 1146 #ifdef COMPAT_FREEBSD32
 1147                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
 1148                         if (w->w_op == NET_RT_IFLISTL)
 1149                                 len = sizeof(struct if_msghdrl32);
 1150                         else
 1151                                 len = sizeof(struct if_msghdr32);
 1152                         compat32 = true;
 1153                         break;
 1154                 }
 1155 #endif
 1156                 if (w != NULL && w->w_op == NET_RT_IFLISTL)
 1157                         len = sizeof(struct if_msghdrl);
 1158                 else
 1159                         len = sizeof(struct if_msghdr);
 1160                 break;
 1161 
 1162         case RTM_NEWMADDR:
 1163                 len = sizeof(struct ifma_msghdr);
 1164                 break;
 1165 
 1166         default:
 1167                 len = sizeof(struct rt_msghdr);
 1168         }
 1169 
 1170         if (w != NULL) {
 1171                 rtm = (struct rt_msghdr *)w->w_tmem;
 1172                 buflen = w->w_tmemsize - len;
 1173                 cp = (caddr_t)w->w_tmem + len;
 1174         }
 1175 
 1176         rtinfo->rti_addrs = 0;
 1177         for (i = 0; i < RTAX_MAX; i++) {
 1178                 struct sockaddr *sa;
 1179 
 1180                 if ((sa = rtinfo->rti_info[i]) == NULL)
 1181                         continue;
 1182                 rtinfo->rti_addrs |= (1 << i);
 1183 #ifdef COMPAT_FREEBSD32
 1184                 if (compat32)
 1185                         dlen = SA_SIZE32(sa);
 1186                 else
 1187 #endif
 1188                         dlen = SA_SIZE(sa);
 1189                 if (cp != NULL && buflen >= dlen) {
 1190 #ifdef INET6
 1191                         if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
 1192                                 sin6 = (struct sockaddr_in6 *)&ss;
 1193                                 bcopy(sa, sin6, sizeof(*sin6));
 1194                                 if (sa6_recoverscope(sin6) == 0)
 1195                                         sa = (struct sockaddr *)sin6;
 1196                         }
 1197 #endif
 1198                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
 1199                         cp += dlen;
 1200                         buflen -= dlen;
 1201                 } else if (cp != NULL) {
 1202                         /*
 1203                          * Buffer too small. Count needed size
 1204                          * and return with error.
 1205                          */
 1206                         cp = NULL;
 1207                 }
 1208 
 1209                 len += dlen;
 1210         }
 1211 
 1212         if (cp != NULL) {
 1213                 dlen = ALIGN(len) - len;
 1214                 if (buflen < dlen)
 1215                         cp = NULL;
 1216                 else {
 1217                         bzero(cp, dlen);
 1218                         cp += dlen;
 1219                         buflen -= dlen;
 1220                 }
 1221         }
 1222         len = ALIGN(len);
 1223 
 1224         if (cp != NULL) {
 1225                 /* fill header iff buffer is large enough */
 1226                 rtm->rtm_version = RTM_VERSION;
 1227                 rtm->rtm_type = type;
 1228                 rtm->rtm_msglen = len;
 1229         }
 1230 
 1231         *plen = len;
 1232 
 1233         if (w != NULL && cp == NULL)
 1234                 return (ENOBUFS);
 1235 
 1236         return (0);
 1237 }
 1238 
 1239 /*
 1240  * This routine is called to generate a message from the routing
 1241  * socket indicating that a redirect has occurred, a routing lookup
 1242  * has failed, or that a protocol has detected timeouts to a particular
 1243  * destination.
 1244  */
 1245 void
 1246 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
 1247     int fibnum)
 1248 {
 1249         struct rt_msghdr *rtm;
 1250         struct mbuf *m;
 1251         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
 1252 
 1253         if (V_route_cb.any_count == 0)
 1254                 return;
 1255         m = rtsock_msg_mbuf(type, rtinfo);
 1256         if (m == NULL)
 1257                 return;
 1258 
 1259         if (fibnum != RT_ALL_FIBS) {
 1260                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
 1261                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
 1262                 M_SETFIB(m, fibnum);
 1263                 m->m_flags |= RTS_FILTER_FIB;
 1264         }
 1265 
 1266         rtm = mtod(m, struct rt_msghdr *);
 1267         rtm->rtm_flags = RTF_DONE | flags;
 1268         rtm->rtm_errno = error;
 1269         rtm->rtm_addrs = rtinfo->rti_addrs;
 1270         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1271 }
 1272 
 1273 void
 1274 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
 1275 {
 1276 
 1277         rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
 1278 }
 1279 
 1280 /*
 1281  * This routine is called to generate a message from the routing
 1282  * socket indicating that the status of a network interface has changed.
 1283  */
 1284 void
 1285 rt_ifmsg(struct ifnet *ifp)
 1286 {
 1287         struct if_msghdr *ifm;
 1288         struct mbuf *m;
 1289         struct rt_addrinfo info;
 1290 
 1291         if (V_route_cb.any_count == 0)
 1292                 return;
 1293         bzero((caddr_t)&info, sizeof(info));
 1294         m = rtsock_msg_mbuf(RTM_IFINFO, &info);
 1295         if (m == NULL)
 1296                 return;
 1297         ifm = mtod(m, struct if_msghdr *);
 1298         ifm->ifm_index = ifp->if_index;
 1299         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1300         if_data_copy(ifp, &ifm->ifm_data);
 1301         ifm->ifm_addrs = 0;
 1302         rt_dispatch(m, AF_UNSPEC);
 1303 }
 1304 
 1305 /*
 1306  * Announce interface address arrival/withdraw.
 1307  * Please do not call directly, use rt_addrmsg().
 1308  * Assume input data to be valid.
 1309  * Returns 0 on success.
 1310  */
 1311 int
 1312 rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
 1313 {
 1314         struct rt_addrinfo info;
 1315         struct sockaddr *sa;
 1316         int ncmd;
 1317         struct mbuf *m;
 1318         struct ifa_msghdr *ifam;
 1319         struct ifnet *ifp = ifa->ifa_ifp;
 1320         struct sockaddr_storage ss;
 1321 
 1322         if (V_route_cb.any_count == 0)
 1323                 return (0);
 1324 
 1325         ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
 1326 
 1327         bzero((caddr_t)&info, sizeof(info));
 1328         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
 1329         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
 1330         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
 1331             info.rti_info[RTAX_IFP], ifa->ifa_netmask, &ss);
 1332         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
 1333         if ((m = rtsock_msg_mbuf(ncmd, &info)) == NULL)
 1334                 return (ENOBUFS);
 1335         ifam = mtod(m, struct ifa_msghdr *);
 1336         ifam->ifam_index = ifp->if_index;
 1337         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
 1338         ifam->ifam_flags = ifa->ifa_flags;
 1339         ifam->ifam_addrs = info.rti_addrs;
 1340 
 1341         if (fibnum != RT_ALL_FIBS) {
 1342                 M_SETFIB(m, fibnum);
 1343                 m->m_flags |= RTS_FILTER_FIB;
 1344         }
 1345 
 1346         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1347 
 1348         return (0);
 1349 }
 1350 
 1351 /*
 1352  * Announce route addition/removal.
 1353  * Please do not call directly, use rt_routemsg().
 1354  * Note that @rt data MAY be inconsistent/invalid:
 1355  * if some userland app sends us "invalid" route message (invalid mask,
 1356  * no dst, wrong address families, etc...) we need to pass it back
 1357  * to app (and any other rtsock consumers) with rtm_errno field set to
 1358  * non-zero value.
 1359  *
 1360  * Returns 0 on success.
 1361  */
 1362 int
 1363 rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
 1364     int fibnum)
 1365 {
 1366         struct rt_addrinfo info;
 1367         struct sockaddr *sa;
 1368         struct mbuf *m;
 1369         struct rt_msghdr *rtm;
 1370         struct sockaddr_storage ss;
 1371 
 1372         if (V_route_cb.any_count == 0)
 1373                 return (0);
 1374 
 1375         bzero((caddr_t)&info, sizeof(info));
 1376         info.rti_info[RTAX_DST] = sa = rt_key(rt);
 1377         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(sa, rt_mask(rt), &ss);
 1378         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 1379         if ((m = rtsock_msg_mbuf(cmd, &info)) == NULL)
 1380                 return (ENOBUFS);
 1381         rtm = mtod(m, struct rt_msghdr *);
 1382         rtm->rtm_index = ifp->if_index;
 1383         rtm->rtm_flags |= rt->rt_flags;
 1384         rtm->rtm_errno = error;
 1385         rtm->rtm_addrs = info.rti_addrs;
 1386 
 1387         if (fibnum != RT_ALL_FIBS) {
 1388                 M_SETFIB(m, fibnum);
 1389                 m->m_flags |= RTS_FILTER_FIB;
 1390         }
 1391 
 1392         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1393 
 1394         return (0);
 1395 }
 1396 
 1397 /*
 1398  * This is the analogue to the rt_newaddrmsg which performs the same
 1399  * function but for multicast group memberhips.  This is easier since
 1400  * there is no route state to worry about.
 1401  */
 1402 void
 1403 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
 1404 {
 1405         struct rt_addrinfo info;
 1406         struct mbuf *m = NULL;
 1407         struct ifnet *ifp = ifma->ifma_ifp;
 1408         struct ifma_msghdr *ifmam;
 1409 
 1410         if (V_route_cb.any_count == 0)
 1411                 return;
 1412 
 1413         bzero((caddr_t)&info, sizeof(info));
 1414         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
 1415         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
 1416         /*
 1417          * If a link-layer address is present, present it as a ``gateway''
 1418          * (similarly to how ARP entries, e.g., are presented).
 1419          */
 1420         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
 1421         m = rtsock_msg_mbuf(cmd, &info);
 1422         if (m == NULL)
 1423                 return;
 1424         ifmam = mtod(m, struct ifma_msghdr *);
 1425         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
 1426             __func__));
 1427         ifmam->ifmam_index = ifp->if_index;
 1428         ifmam->ifmam_addrs = info.rti_addrs;
 1429         rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
 1430 }
 1431 
 1432 static struct mbuf *
 1433 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
 1434         struct rt_addrinfo *info)
 1435 {
 1436         struct if_announcemsghdr *ifan;
 1437         struct mbuf *m;
 1438 
 1439         if (V_route_cb.any_count == 0)
 1440                 return NULL;
 1441         bzero((caddr_t)info, sizeof(*info));
 1442         m = rtsock_msg_mbuf(type, info);
 1443         if (m != NULL) {
 1444                 ifan = mtod(m, struct if_announcemsghdr *);
 1445                 ifan->ifan_index = ifp->if_index;
 1446                 strlcpy(ifan->ifan_name, ifp->if_xname,
 1447                         sizeof(ifan->ifan_name));
 1448                 ifan->ifan_what = what;
 1449         }
 1450         return m;
 1451 }
 1452 
 1453 /*
 1454  * This is called to generate routing socket messages indicating
 1455  * IEEE80211 wireless events.
 1456  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
 1457  */
 1458 void
 1459 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
 1460 {
 1461         struct mbuf *m;
 1462         struct rt_addrinfo info;
 1463 
 1464         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
 1465         if (m != NULL) {
 1466                 /*
 1467                  * Append the ieee80211 data.  Try to stick it in the
 1468                  * mbuf containing the ifannounce msg; otherwise allocate
 1469                  * a new mbuf and append.
 1470                  *
 1471                  * NB: we assume m is a single mbuf.
 1472                  */
 1473                 if (data_len > M_TRAILINGSPACE(m)) {
 1474                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
 1475                         if (n == NULL) {
 1476                                 m_freem(m);
 1477                                 return;
 1478                         }
 1479                         bcopy(data, mtod(n, void *), data_len);
 1480                         n->m_len = data_len;
 1481                         m->m_next = n;
 1482                 } else if (data_len > 0) {
 1483                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
 1484                         m->m_len += data_len;
 1485                 }
 1486                 if (m->m_flags & M_PKTHDR)
 1487                         m->m_pkthdr.len += data_len;
 1488                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
 1489                 rt_dispatch(m, AF_UNSPEC);
 1490         }
 1491 }
 1492 
 1493 /*
 1494  * This is called to generate routing socket messages indicating
 1495  * network interface arrival and departure.
 1496  */
 1497 void
 1498 rt_ifannouncemsg(struct ifnet *ifp, int what)
 1499 {
 1500         struct mbuf *m;
 1501         struct rt_addrinfo info;
 1502 
 1503         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
 1504         if (m != NULL)
 1505                 rt_dispatch(m, AF_UNSPEC);
 1506 }
 1507 
 1508 static void
 1509 rt_dispatch(struct mbuf *m, sa_family_t saf)
 1510 {
 1511         struct m_tag *tag;
 1512 
 1513         /*
 1514          * Preserve the family from the sockaddr, if any, in an m_tag for
 1515          * use when injecting the mbuf into the routing socket buffer from
 1516          * the netisr.
 1517          */
 1518         if (saf != AF_UNSPEC) {
 1519                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
 1520                     M_NOWAIT);
 1521                 if (tag == NULL) {
 1522                         m_freem(m);
 1523                         return;
 1524                 }
 1525                 *(unsigned short *)(tag + 1) = saf;
 1526                 m_tag_prepend(m, tag);
 1527         }
 1528 #ifdef VIMAGE
 1529         if (V_loif)
 1530                 m->m_pkthdr.rcvif = V_loif;
 1531         else {
 1532                 m_freem(m);
 1533                 return;
 1534         }
 1535 #endif
 1536         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
 1537 }
 1538 
 1539 /*
 1540  * This is used in dumping the kernel table via sysctl().
 1541  */
 1542 static int
 1543 sysctl_dumpentry(struct radix_node *rn, void *vw)
 1544 {
 1545         struct walkarg *w = vw;
 1546         struct rtentry *rt = (struct rtentry *)rn;
 1547         int error = 0, size;
 1548         struct rt_addrinfo info;
 1549         struct sockaddr_storage ss;
 1550 
 1551         IFNET_RLOCK_NOSLEEP_ASSERT();
 1552 
 1553         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
 1554                 return 0;
 1555         if ((rt->rt_flags & RTF_HOST) == 0
 1556             ? jailed_without_vnet(w->w_req->td->td_ucred)
 1557             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
 1558                 return (0);
 1559         bzero((caddr_t)&info, sizeof(info));
 1560         info.rti_info[RTAX_DST] = rt_key(rt);
 1561         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 1562         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
 1563             rt_mask(rt), &ss);
 1564         info.rti_info[RTAX_GENMASK] = 0;
 1565         if (rt->rt_ifp && !(rt->rt_ifp->if_flags & IFF_DYING)) {
 1566                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
 1567                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 1568                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
 1569                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
 1570         }
 1571         if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
 1572                 return (error);
 1573         if (w->w_req && w->w_tmem) {
 1574                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
 1575 
 1576                 bzero(&rtm->rtm_index,
 1577                     sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
 1578                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
 1579                         rtm->rtm_flags = RTF_GATEWAY | 
 1580                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
 1581                 else
 1582                         rtm->rtm_flags = rt->rt_flags;
 1583                 rt_getmetrics(rt, &rtm->rtm_rmx);
 1584                 rtm->rtm_index = rt->rt_ifp->if_index;
 1585                 rtm->rtm_addrs = info.rti_addrs;
 1586                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
 1587                 return (error);
 1588         }
 1589         return (error);
 1590 }
 1591 
 1592 static int
 1593 sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
 1594     struct rt_addrinfo *info, struct walkarg *w, int len)
 1595 {
 1596         struct if_msghdrl *ifm;
 1597         struct if_data *ifd;
 1598 
 1599         ifm = (struct if_msghdrl *)w->w_tmem;
 1600 
 1601 #ifdef COMPAT_FREEBSD32
 1602         if (w->w_req->flags & SCTL_MASK32) {
 1603                 struct if_msghdrl32 *ifm32;
 1604 
 1605                 ifm32 = (struct if_msghdrl32 *)ifm;
 1606                 ifm32->ifm_addrs = info->rti_addrs;
 1607                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1608                 ifm32->ifm_index = ifp->if_index;
 1609                 ifm32->_ifm_spare1 = 0;
 1610                 ifm32->ifm_len = sizeof(*ifm32);
 1611                 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
 1612                 ifm32->_ifm_spare2 = 0;
 1613                 ifd = &ifm32->ifm_data;
 1614         } else
 1615 #endif
 1616         {
 1617                 ifm->ifm_addrs = info->rti_addrs;
 1618                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1619                 ifm->ifm_index = ifp->if_index;
 1620                 ifm->_ifm_spare1 = 0;
 1621                 ifm->ifm_len = sizeof(*ifm);
 1622                 ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
 1623                 ifm->_ifm_spare2 = 0;
 1624                 ifd = &ifm->ifm_data;
 1625         }
 1626 
 1627         memcpy(ifd, src_ifd, sizeof(*ifd));
 1628 
 1629         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
 1630 }
 1631 
 1632 static int
 1633 sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
 1634     struct rt_addrinfo *info, struct walkarg *w, int len)
 1635 {
 1636         struct if_msghdr *ifm;
 1637         struct if_data *ifd;
 1638 
 1639         ifm = (struct if_msghdr *)w->w_tmem;
 1640 
 1641 #ifdef COMPAT_FREEBSD32
 1642         if (w->w_req->flags & SCTL_MASK32) {
 1643                 struct if_msghdr32 *ifm32;
 1644 
 1645                 ifm32 = (struct if_msghdr32 *)ifm;
 1646                 ifm32->ifm_addrs = info->rti_addrs;
 1647                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1648                 ifm32->ifm_index = ifp->if_index;
 1649                 ifm32->_ifm_spare1 = 0;
 1650                 ifd = &ifm32->ifm_data;
 1651         } else
 1652 #endif
 1653         {
 1654                 ifm->ifm_addrs = info->rti_addrs;
 1655                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1656                 ifm->ifm_index = ifp->if_index;
 1657                 ifm->_ifm_spare1 = 0;
 1658                 ifd = &ifm->ifm_data;
 1659         }
 1660 
 1661         memcpy(ifd, src_ifd, sizeof(*ifd));
 1662 
 1663         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
 1664 }
 1665 
 1666 static int
 1667 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
 1668     struct walkarg *w, int len)
 1669 {
 1670         struct ifa_msghdrl *ifam;
 1671         struct if_data *ifd;
 1672 
 1673         ifam = (struct ifa_msghdrl *)w->w_tmem;
 1674 
 1675 #ifdef COMPAT_FREEBSD32
 1676         if (w->w_req->flags & SCTL_MASK32) {
 1677                 struct ifa_msghdrl32 *ifam32;
 1678 
 1679                 ifam32 = (struct ifa_msghdrl32 *)ifam;
 1680                 ifam32->ifam_addrs = info->rti_addrs;
 1681                 ifam32->ifam_flags = ifa->ifa_flags;
 1682                 ifam32->ifam_index = ifa->ifa_ifp->if_index;
 1683                 ifam32->_ifam_spare1 = 0;
 1684                 ifam32->ifam_len = sizeof(*ifam32);
 1685                 ifam32->ifam_data_off =
 1686                     offsetof(struct ifa_msghdrl32, ifam_data);
 1687                 ifam32->ifam_metric = ifa->ifa_ifp->if_metric;
 1688                 ifd = &ifam32->ifam_data;
 1689         } else
 1690 #endif
 1691         {
 1692                 ifam->ifam_addrs = info->rti_addrs;
 1693                 ifam->ifam_flags = ifa->ifa_flags;
 1694                 ifam->ifam_index = ifa->ifa_ifp->if_index;
 1695                 ifam->_ifam_spare1 = 0;
 1696                 ifam->ifam_len = sizeof(*ifam);
 1697                 ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
 1698                 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
 1699                 ifd = &ifam->ifam_data;
 1700         }
 1701 
 1702         bzero(ifd, sizeof(*ifd));
 1703         ifd->ifi_datalen = sizeof(struct if_data);
 1704         ifd->ifi_ipackets = counter_u64_fetch(ifa->ifa_ipackets);
 1705         ifd->ifi_opackets = counter_u64_fetch(ifa->ifa_opackets);
 1706         ifd->ifi_ibytes = counter_u64_fetch(ifa->ifa_ibytes);
 1707         ifd->ifi_obytes = counter_u64_fetch(ifa->ifa_obytes);
 1708 
 1709         /* Fixup if_data carp(4) vhid. */
 1710         if (carp_get_vhid_p != NULL)
 1711                 ifd->ifi_vhid = (*carp_get_vhid_p)(ifa);
 1712 
 1713         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
 1714 }
 1715 
 1716 static int
 1717 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
 1718     struct walkarg *w, int len)
 1719 {
 1720         struct ifa_msghdr *ifam;
 1721 
 1722         ifam = (struct ifa_msghdr *)w->w_tmem;
 1723         ifam->ifam_addrs = info->rti_addrs;
 1724         ifam->ifam_flags = ifa->ifa_flags;
 1725         ifam->ifam_index = ifa->ifa_ifp->if_index;
 1726         ifam->_ifam_spare1 = 0;
 1727         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
 1728 
 1729         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
 1730 }
 1731 
 1732 static int
 1733 sysctl_iflist(int af, struct walkarg *w)
 1734 {
 1735         struct ifnet *ifp;
 1736         struct ifaddr *ifa;
 1737         struct if_data ifd;
 1738         struct rt_addrinfo info;
 1739         int len, error = 0;
 1740         struct sockaddr_storage ss;
 1741 
 1742         bzero((caddr_t)&info, sizeof(info));
 1743         bzero(&ifd, sizeof(ifd));
 1744         IFNET_RLOCK_NOSLEEP();
 1745         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1746                 if (w->w_arg && w->w_arg != ifp->if_index)
 1747                         continue;
 1748                 if_data_copy(ifp, &ifd);
 1749                 IF_ADDR_RLOCK(ifp);
 1750                 ifa = ifp->if_addr;
 1751                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
 1752                 error = rtsock_msg_buffer(RTM_IFINFO, &info, w, &len);
 1753                 if (error != 0)
 1754                         goto done;
 1755                 info.rti_info[RTAX_IFP] = NULL;
 1756                 if (w->w_req && w->w_tmem) {
 1757                         if (w->w_op == NET_RT_IFLISTL)
 1758                                 error = sysctl_iflist_ifml(ifp, &ifd, &info, w,
 1759                                     len);
 1760                         else
 1761                                 error = sysctl_iflist_ifm(ifp, &ifd, &info, w,
 1762                                     len);
 1763                         if (error)
 1764                                 goto done;
 1765                 }
 1766                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
 1767                         if (af && af != ifa->ifa_addr->sa_family)
 1768                                 continue;
 1769                         if (prison_if(w->w_req->td->td_ucred,
 1770                             ifa->ifa_addr) != 0)
 1771                                 continue;
 1772                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
 1773                         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
 1774                             ifa->ifa_addr, ifa->ifa_netmask, &ss);
 1775                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
 1776                         error = rtsock_msg_buffer(RTM_NEWADDR, &info, w, &len);
 1777                         if (error != 0)
 1778                                 goto done;
 1779                         if (w->w_req && w->w_tmem) {
 1780                                 if (w->w_op == NET_RT_IFLISTL)
 1781                                         error = sysctl_iflist_ifaml(ifa, &info,
 1782                                             w, len);
 1783                                 else
 1784                                         error = sysctl_iflist_ifam(ifa, &info,
 1785                                             w, len);
 1786                                 if (error)
 1787                                         goto done;
 1788                         }
 1789                 }
 1790                 IF_ADDR_RUNLOCK(ifp);
 1791                 info.rti_info[RTAX_IFA] = NULL;
 1792                 info.rti_info[RTAX_NETMASK] = NULL;
 1793                 info.rti_info[RTAX_BRD] = NULL;
 1794         }
 1795 done:
 1796         if (ifp != NULL)
 1797                 IF_ADDR_RUNLOCK(ifp);
 1798         IFNET_RUNLOCK_NOSLEEP();
 1799         return (error);
 1800 }
 1801 
 1802 static int
 1803 sysctl_ifmalist(int af, struct walkarg *w)
 1804 {
 1805         struct rt_addrinfo info;
 1806         struct ifaddr *ifa;
 1807         struct ifmultiaddr *ifma;
 1808         struct ifnet *ifp;
 1809         int error, len;
 1810 
 1811         error = 0;
 1812         bzero((caddr_t)&info, sizeof(info));
 1813 
 1814         IFNET_RLOCK_NOSLEEP();
 1815         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1816                 if (w->w_arg && w->w_arg != ifp->if_index)
 1817                         continue;
 1818                 ifa = ifp->if_addr;
 1819                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
 1820                 IF_ADDR_RLOCK(ifp);
 1821                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 1822                         if (af && af != ifma->ifma_addr->sa_family)
 1823                                 continue;
 1824                         if (prison_if(w->w_req->td->td_ucred,
 1825                             ifma->ifma_addr) != 0)
 1826                                 continue;
 1827                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
 1828                         info.rti_info[RTAX_GATEWAY] =
 1829                             (ifma->ifma_addr->sa_family != AF_LINK) ?
 1830                             ifma->ifma_lladdr : NULL;
 1831                         error = rtsock_msg_buffer(RTM_NEWMADDR, &info, w, &len);
 1832                         if (error != 0)
 1833                                 break;
 1834                         if (w->w_req && w->w_tmem) {
 1835                                 struct ifma_msghdr *ifmam;
 1836 
 1837                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
 1838                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
 1839                                 ifmam->ifmam_flags = 0;
 1840                                 ifmam->ifmam_addrs = info.rti_addrs;
 1841                                 ifmam->_ifmam_spare1 = 0;
 1842                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
 1843                                 if (error != 0)
 1844                                         break;
 1845                         }
 1846                 }
 1847                 IF_ADDR_RUNLOCK(ifp);
 1848                 if (error != 0)
 1849                         break;
 1850         }
 1851         IFNET_RUNLOCK_NOSLEEP();
 1852         return (error);
 1853 }
 1854 
 1855 static int
 1856 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
 1857 {
 1858         int     *name = (int *)arg1;
 1859         u_int   namelen = arg2;
 1860         struct rib_head *rnh = NULL; /* silence compiler. */
 1861         int     i, lim, error = EINVAL;
 1862         int     fib = 0;
 1863         u_char  af;
 1864         struct  walkarg w;
 1865 
 1866         name ++;
 1867         namelen--;
 1868         if (req->newptr)
 1869                 return (EPERM);
 1870         if (name[1] == NET_RT_DUMP) {
 1871                 if (namelen == 3)
 1872                         fib = req->td->td_proc->p_fibnum;
 1873                 else if (namelen == 4)
 1874                         fib = (name[3] == RT_ALL_FIBS) ?
 1875                             req->td->td_proc->p_fibnum : name[3];
 1876                 else
 1877                         return ((namelen < 3) ? EISDIR : ENOTDIR);
 1878                 if (fib < 0 || fib >= rt_numfibs)
 1879                         return (EINVAL);
 1880         } else if (namelen != 3)
 1881                 return ((namelen < 3) ? EISDIR : ENOTDIR);
 1882         af = name[0];
 1883         if (af > AF_MAX)
 1884                 return (EINVAL);
 1885         bzero(&w, sizeof(w));
 1886         w.w_op = name[1];
 1887         w.w_arg = name[2];
 1888         w.w_req = req;
 1889 
 1890         error = sysctl_wire_old_buffer(req, 0);
 1891         if (error)
 1892                 return (error);
 1893         
 1894         /*
 1895          * Allocate reply buffer in advance.
 1896          * All rtsock messages has maximum length of u_short.
 1897          */
 1898         w.w_tmemsize = 65536;
 1899         w.w_tmem = malloc(w.w_tmemsize, M_TEMP, M_WAITOK);
 1900 
 1901         switch (w.w_op) {
 1902 
 1903         case NET_RT_DUMP:
 1904         case NET_RT_FLAGS:
 1905                 if (af == 0) {                  /* dump all tables */
 1906                         i = 1;
 1907                         lim = AF_MAX;
 1908                 } else                          /* dump only one table */
 1909                         i = lim = af;
 1910 
 1911                 /*
 1912                  * take care of llinfo entries, the caller must
 1913                  * specify an AF
 1914                  */
 1915                 if (w.w_op == NET_RT_FLAGS &&
 1916                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
 1917                         if (af != 0)
 1918                                 error = lltable_sysctl_dumparp(af, w.w_req);
 1919                         else
 1920                                 error = EINVAL;
 1921                         break;
 1922                 }
 1923                 /*
 1924                  * take care of routing entries
 1925                  */
 1926                 for (error = 0; error == 0 && i <= lim; i++) {
 1927                         rnh = rt_tables_get_rnh(fib, i);
 1928                         if (rnh != NULL) {
 1929                                 RIB_RLOCK(rnh); 
 1930                                 IFNET_RLOCK_NOSLEEP();
 1931                                 error = rnh->rnh_walktree(&rnh->head,
 1932                                     sysctl_dumpentry, &w);
 1933                                 IFNET_RUNLOCK_NOSLEEP();
 1934                                 RIB_RUNLOCK(rnh);
 1935                         } else if (af != 0)
 1936                                 error = EAFNOSUPPORT;
 1937                 }
 1938                 break;
 1939 
 1940         case NET_RT_IFLIST:
 1941         case NET_RT_IFLISTL:
 1942                 error = sysctl_iflist(af, &w);
 1943                 break;
 1944 
 1945         case NET_RT_IFMALIST:
 1946                 error = sysctl_ifmalist(af, &w);
 1947                 break;
 1948         }
 1949 
 1950         free(w.w_tmem, M_TEMP);
 1951         return (error);
 1952 }
 1953 
 1954 static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
 1955 
 1956 /*
 1957  * Definitions of protocols supported in the ROUTE domain.
 1958  */
 1959 
 1960 static struct domain routedomain;               /* or at least forward */
 1961 
 1962 static struct protosw routesw[] = {
 1963 {
 1964         .pr_type =              SOCK_RAW,
 1965         .pr_domain =            &routedomain,
 1966         .pr_flags =             PR_ATOMIC|PR_ADDR,
 1967         .pr_output =            route_output,
 1968         .pr_ctlinput =          raw_ctlinput,
 1969         .pr_init =              raw_init,
 1970         .pr_usrreqs =           &route_usrreqs
 1971 }
 1972 };
 1973 
 1974 static struct domain routedomain = {
 1975         .dom_family =           PF_ROUTE,
 1976         .dom_name =              "route",
 1977         .dom_protosw =          routesw,
 1978         .dom_protoswNPROTOSW =  &routesw[nitems(routesw)]
 1979 };
 1980 
 1981 VNET_DOMAIN_SET(route);

Cache object: 05572e5bf103da826a1e2828ea05b6c4


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