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: releng/10.4/sys/net/rtsock.c 302233 2016-06-27 21:44:27Z bdrewery $
   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 #define _IN_NET_RTSOCK_C
   55 #include <net/if.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/vnet.h>
   63 
   64 #include <netinet/in.h>
   65 #include <netinet/if_ether.h>
   66 #include <netinet/ip_carp.h>
   67 #ifdef INET6
   68 #include <netinet6/ip6_var.h>
   69 #include <netinet6/scope6_var.h>
   70 #endif
   71 
   72 #ifdef COMPAT_FREEBSD32
   73 #include <sys/mount.h>
   74 #include <compat/freebsd32/freebsd32.h>
   75 
   76 struct if_data32 {
   77         uint8_t ifi_type;
   78         uint8_t ifi_physical;
   79         uint8_t ifi_addrlen;
   80         uint8_t ifi_hdrlen;
   81         uint8_t ifi_link_state;
   82         uint8_t ifi_vhid;
   83         uint8_t ifi_baudrate_pf;
   84         uint8_t ifi_datalen;
   85         uint32_t ifi_mtu;
   86         uint32_t ifi_metric;
   87         uint32_t ifi_baudrate;
   88         uint32_t ifi_ipackets;
   89         uint32_t ifi_ierrors;
   90         uint32_t ifi_opackets;
   91         uint32_t ifi_oerrors;
   92         uint32_t ifi_collisions;
   93         uint32_t ifi_ibytes;
   94         uint32_t ifi_obytes;
   95         uint32_t ifi_imcasts;
   96         uint32_t ifi_omcasts;
   97         uint32_t ifi_iqdrops;
   98         uint32_t ifi_noproto;
   99         uint32_t ifi_hwassist;
  100         int32_t ifi_epoch;
  101         struct  timeval32 ifi_lastchange;
  102         uint32_t ifi_oqdrops;
  103 };
  104 
  105 struct if_msghdr32 {
  106         uint16_t ifm_msglen;
  107         uint8_t ifm_version;
  108         uint8_t ifm_type;
  109         int32_t ifm_addrs;
  110         int32_t ifm_flags;
  111         uint16_t ifm_index;
  112         struct  if_data32 ifm_data;
  113 };
  114 
  115 struct if_msghdrl32 {
  116         uint16_t ifm_msglen;
  117         uint8_t ifm_version;
  118         uint8_t ifm_type;
  119         int32_t ifm_addrs;
  120         int32_t ifm_flags;
  121         uint16_t ifm_index;
  122         uint16_t _ifm_spare1;
  123         uint16_t ifm_len;
  124         uint16_t ifm_data_off;
  125         struct  if_data32 ifm_data;
  126 };
  127 
  128 struct ifa_msghdrl32 {
  129         uint16_t ifam_msglen;
  130         uint8_t ifam_version;
  131         uint8_t ifam_type;
  132         int32_t ifam_addrs;
  133         int32_t ifam_flags;
  134         uint16_t ifam_index;
  135         uint16_t _ifam_spare1;
  136         uint16_t ifam_len;
  137         uint16_t ifam_data_off;
  138         int32_t ifam_metric;
  139         struct  if_data32 ifam_data;
  140 };
  141 #endif /* COMPAT_FREEBSD32 */
  142 
  143 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
  144 
  145 /* NB: these are not modified */
  146 static struct   sockaddr route_src = { 2, PF_ROUTE, };
  147 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
  148 
  149 /* These are external hooks for CARP. */
  150 int     (*carp_get_vhid_p)(struct ifaddr *);
  151 
  152 /*
  153  * Used by rtsock/raw_input callback code to decide whether to filter the update
  154  * notification to a socket bound to a particular FIB.
  155  */
  156 #define RTS_FILTER_FIB  M_PROTO8
  157 
  158 static struct {
  159         int     ip_count;       /* attached w/ AF_INET */
  160         int     ip6_count;      /* attached w/ AF_INET6 */
  161         int     ipx_count;      /* attached w/ AF_IPX */
  162         int     any_count;      /* total attached */
  163 } route_cb;
  164 
  165 struct mtx rtsock_mtx;
  166 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
  167 
  168 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
  169 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
  170 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
  171 
  172 static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
  173 
  174 struct walkarg {
  175         int     w_tmemsize;
  176         int     w_op, w_arg;
  177         caddr_t w_tmem;
  178         struct sysctl_req *w_req;
  179 };
  180 
  181 static void     rts_input(struct mbuf *m);
  182 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
  183 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
  184                         caddr_t cp, struct walkarg *w);
  185 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
  186                         struct rt_addrinfo *rtinfo);
  187 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
  188 static int      sysctl_iflist(int af, struct walkarg *w);
  189 static int      sysctl_ifmalist(int af, struct walkarg *w);
  190 static int      route_output(struct mbuf *m, struct socket *so);
  191 static void     rt_setmetrics(const struct rt_msghdr *rtm, struct rtentry *rt);
  192 static void     rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
  193 static void     rt_dispatch(struct mbuf *, sa_family_t);
  194 
  195 static struct netisr_handler rtsock_nh = {
  196         .nh_name = "rtsock",
  197         .nh_handler = rts_input,
  198         .nh_proto = NETISR_ROUTE,
  199         .nh_policy = NETISR_POLICY_SOURCE,
  200 };
  201 
  202 static int
  203 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
  204 {
  205         int error, qlimit;
  206 
  207         netisr_getqlimit(&rtsock_nh, &qlimit);
  208         error = sysctl_handle_int(oidp, &qlimit, 0, req);
  209         if (error || !req->newptr)
  210                 return (error);
  211         if (qlimit < 1)
  212                 return (EINVAL);
  213         return (netisr_setqlimit(&rtsock_nh, qlimit));
  214 }
  215 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
  216     0, 0, sysctl_route_netisr_maxqlen, "I",
  217     "maximum routing socket dispatch queue length");
  218 
  219 static void
  220 rts_init(void)
  221 {
  222         int tmp;
  223 
  224         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
  225                 rtsock_nh.nh_qlimit = tmp;
  226         netisr_register(&rtsock_nh);
  227 }
  228 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
  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                 route_cb.ip_count++;
  318                 break;
  319         case AF_INET6:
  320                 route_cb.ip6_count++;
  321                 break;
  322         case AF_IPX:
  323                 route_cb.ipx_count++;
  324                 break;
  325         }
  326         route_cb.any_count++;
  327         RTSOCK_UNLOCK();
  328         soisconnected(so);
  329         so->so_options |= SO_USELOOPBACK;
  330         return 0;
  331 }
  332 
  333 static int
  334 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  335 {
  336 
  337         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
  338 }
  339 
  340 static int
  341 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  342 {
  343 
  344         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
  345 }
  346 
  347 /* pru_connect2 is EOPNOTSUPP */
  348 /* pru_control is EOPNOTSUPP */
  349 
  350 static void
  351 rts_detach(struct socket *so)
  352 {
  353         struct rawcb *rp = sotorawcb(so);
  354 
  355         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
  356 
  357         RTSOCK_LOCK();
  358         switch(rp->rcb_proto.sp_protocol) {
  359         case AF_INET:
  360                 route_cb.ip_count--;
  361                 break;
  362         case AF_INET6:
  363                 route_cb.ip6_count--;
  364                 break;
  365         case AF_IPX:
  366                 route_cb.ipx_count--;
  367                 break;
  368         }
  369         route_cb.any_count--;
  370         RTSOCK_UNLOCK();
  371         raw_usrreqs.pru_detach(so);
  372 }
  373 
  374 static int
  375 rts_disconnect(struct socket *so)
  376 {
  377 
  378         return (raw_usrreqs.pru_disconnect(so));
  379 }
  380 
  381 /* pru_listen is EOPNOTSUPP */
  382 
  383 static int
  384 rts_peeraddr(struct socket *so, struct sockaddr **nam)
  385 {
  386 
  387         return (raw_usrreqs.pru_peeraddr(so, nam));
  388 }
  389 
  390 /* pru_rcvd is EOPNOTSUPP */
  391 /* pru_rcvoob is EOPNOTSUPP */
  392 
  393 static int
  394 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  395          struct mbuf *control, struct thread *td)
  396 {
  397 
  398         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
  399 }
  400 
  401 /* pru_sense is null */
  402 
  403 static int
  404 rts_shutdown(struct socket *so)
  405 {
  406 
  407         return (raw_usrreqs.pru_shutdown(so));
  408 }
  409 
  410 static int
  411 rts_sockaddr(struct socket *so, struct sockaddr **nam)
  412 {
  413 
  414         return (raw_usrreqs.pru_sockaddr(so, nam));
  415 }
  416 
  417 static struct pr_usrreqs route_usrreqs = {
  418         .pru_abort =            rts_abort,
  419         .pru_attach =           rts_attach,
  420         .pru_bind =             rts_bind,
  421         .pru_connect =          rts_connect,
  422         .pru_detach =           rts_detach,
  423         .pru_disconnect =       rts_disconnect,
  424         .pru_peeraddr =         rts_peeraddr,
  425         .pru_send =             rts_send,
  426         .pru_shutdown =         rts_shutdown,
  427         .pru_sockaddr =         rts_sockaddr,
  428         .pru_close =            rts_close,
  429 };
  430 
  431 #ifndef _SOCKADDR_UNION_DEFINED
  432 #define _SOCKADDR_UNION_DEFINED
  433 /*
  434  * The union of all possible address formats we handle.
  435  */
  436 union sockaddr_union {
  437         struct sockaddr         sa;
  438         struct sockaddr_in      sin;
  439         struct sockaddr_in6     sin6;
  440 };
  441 #endif /* _SOCKADDR_UNION_DEFINED */
  442 
  443 static int
  444 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
  445     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
  446 {
  447 
  448         /* First, see if the returned address is part of the jail. */
  449         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
  450                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  451                 return (0);
  452         }
  453 
  454         switch (info->rti_info[RTAX_DST]->sa_family) {
  455 #ifdef INET
  456         case AF_INET:
  457         {
  458                 struct in_addr ia;
  459                 struct ifaddr *ifa;
  460                 int found;
  461 
  462                 found = 0;
  463                 /*
  464                  * Try to find an address on the given outgoing interface
  465                  * that belongs to the jail.
  466                  */
  467                 IF_ADDR_RLOCK(ifp);
  468                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  469                         struct sockaddr *sa;
  470                         sa = ifa->ifa_addr;
  471                         if (sa->sa_family != AF_INET)
  472                                 continue;
  473                         ia = ((struct sockaddr_in *)sa)->sin_addr;
  474                         if (prison_check_ip4(cred, &ia) == 0) {
  475                                 found = 1;
  476                                 break;
  477                         }
  478                 }
  479                 IF_ADDR_RUNLOCK(ifp);
  480                 if (!found) {
  481                         /*
  482                          * As a last resort return the 'default' jail address.
  483                          */
  484                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
  485                             sin_addr;
  486                         if (prison_get_ip4(cred, &ia) != 0)
  487                                 return (ESRCH);
  488                 }
  489                 bzero(&saun->sin, sizeof(struct sockaddr_in));
  490                 saun->sin.sin_len = sizeof(struct sockaddr_in);
  491                 saun->sin.sin_family = AF_INET;
  492                 saun->sin.sin_addr.s_addr = ia.s_addr;
  493                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
  494                 break;
  495         }
  496 #endif
  497 #ifdef INET6
  498         case AF_INET6:
  499         {
  500                 struct in6_addr ia6;
  501                 struct ifaddr *ifa;
  502                 int found;
  503 
  504                 found = 0;
  505                 /*
  506                  * Try to find an address on the given outgoing interface
  507                  * that belongs to the jail.
  508                  */
  509                 IF_ADDR_RLOCK(ifp);
  510                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  511                         struct sockaddr *sa;
  512                         sa = ifa->ifa_addr;
  513                         if (sa->sa_family != AF_INET6)
  514                                 continue;
  515                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
  516                             &ia6, sizeof(struct in6_addr));
  517                         if (prison_check_ip6(cred, &ia6) == 0) {
  518                                 found = 1;
  519                                 break;
  520                         }
  521                 }
  522                 IF_ADDR_RUNLOCK(ifp);
  523                 if (!found) {
  524                         /*
  525                          * As a last resort return the 'default' jail address.
  526                          */
  527                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
  528                             sin6_addr;
  529                         if (prison_get_ip6(cred, &ia6) != 0)
  530                                 return (ESRCH);
  531                 }
  532                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
  533                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
  534                 saun->sin6.sin6_family = AF_INET6;
  535                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
  536                 if (sa6_recoverscope(&saun->sin6) != 0)
  537                         return (ESRCH);
  538                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
  539                 break;
  540         }
  541 #endif
  542         default:
  543                 return (ESRCH);
  544         }
  545         return (0);
  546 }
  547 
  548 /*ARGSUSED*/
  549 static int
  550 route_output(struct mbuf *m, struct socket *so)
  551 {
  552 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
  553         struct rt_msghdr *rtm = NULL;
  554         struct rtentry *rt = NULL;
  555         struct radix_node_head *rnh;
  556         struct rt_addrinfo info;
  557 #ifdef INET6
  558         struct sockaddr_storage ss;
  559         struct sockaddr_in6 *sin6;
  560         int i, rti_need_deembed = 0;
  561 #endif
  562         int len, error = 0;
  563         struct ifnet *ifp = NULL;
  564         union sockaddr_union saun;
  565         sa_family_t saf = AF_UNSPEC;
  566 
  567 #define senderr(e) { error = e; goto flush;}
  568         if (m == NULL || ((m->m_len < sizeof(long)) &&
  569                        (m = m_pullup(m, sizeof(long))) == NULL))
  570                 return (ENOBUFS);
  571         if ((m->m_flags & M_PKTHDR) == 0)
  572                 panic("route_output");
  573         len = m->m_pkthdr.len;
  574         if (len < sizeof(*rtm) ||
  575             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
  576                 info.rti_info[RTAX_DST] = NULL;
  577                 senderr(EINVAL);
  578         }
  579         R_Malloc(rtm, struct rt_msghdr *, len);
  580         if (rtm == NULL) {
  581                 info.rti_info[RTAX_DST] = NULL;
  582                 senderr(ENOBUFS);
  583         }
  584         m_copydata(m, 0, len, (caddr_t)rtm);
  585         if (rtm->rtm_version != RTM_VERSION) {
  586                 info.rti_info[RTAX_DST] = NULL;
  587                 senderr(EPROTONOSUPPORT);
  588         }
  589         rtm->rtm_pid = curproc->p_pid;
  590         bzero(&info, sizeof(info));
  591         info.rti_addrs = rtm->rtm_addrs;
  592         /*
  593          * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
  594          * link-local address because rtrequest requires addresses with
  595          * embedded scope id.
  596          */
  597         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
  598                 info.rti_info[RTAX_DST] = NULL;
  599                 senderr(EINVAL);
  600         }
  601         info.rti_flags = rtm->rtm_flags;
  602         if (info.rti_info[RTAX_DST] == NULL ||
  603             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
  604             (info.rti_info[RTAX_GATEWAY] != NULL &&
  605              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
  606                 senderr(EINVAL);
  607         saf = info.rti_info[RTAX_DST]->sa_family;
  608         /*
  609          * Verify that the caller has the appropriate privilege; RTM_GET
  610          * is the only operation the non-superuser is allowed.
  611          */
  612         if (rtm->rtm_type != RTM_GET) {
  613                 error = priv_check(curthread, PRIV_NET_ROUTE);
  614                 if (error)
  615                         senderr(error);
  616         }
  617 
  618         /*
  619          * The given gateway address may be an interface address.
  620          * For example, issuing a "route change" command on a route
  621          * entry that was created from a tunnel, and the gateway
  622          * address given is the local end point. In this case the 
  623          * RTF_GATEWAY flag must be cleared or the destination will
  624          * not be reachable even though there is no error message.
  625          */
  626         if (info.rti_info[RTAX_GATEWAY] != NULL &&
  627             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
  628                 struct route gw_ro;
  629 
  630                 bzero(&gw_ro, sizeof(gw_ro));
  631                 gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
  632                 rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
  633                 /* 
  634                  * A host route through the loopback interface is 
  635                  * installed for each interface adddress. In pre 8.0
  636                  * releases the interface address of a PPP link type
  637                  * is not reachable locally. This behavior is fixed as 
  638                  * part of the new L2/L3 redesign and rewrite work. The
  639                  * signature of this interface address route is the
  640                  * AF_LINK sa_family type of the rt_gateway, and the
  641                  * rt_ifp has the IFF_LOOPBACK flag set.
  642                  */
  643                 if (gw_ro.ro_rt != NULL &&
  644                     gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
  645                     gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) {
  646                         info.rti_flags &= ~RTF_GATEWAY;
  647                         info.rti_flags |= RTF_GWFLAG_COMPAT;
  648                 }
  649                 if (gw_ro.ro_rt != NULL)
  650                         RTFREE(gw_ro.ro_rt);
  651         }
  652 
  653         switch (rtm->rtm_type) {
  654                 struct rtentry *saved_nrt;
  655 
  656         case RTM_ADD:
  657                 if (info.rti_info[RTAX_GATEWAY] == NULL)
  658                         senderr(EINVAL);
  659                 saved_nrt = NULL;
  660 
  661                 /* support for new ARP code */
  662                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
  663                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
  664                         error = lla_rt_output(rtm, &info);
  665 #ifdef INET6
  666                         if (error == 0)
  667                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  668 #endif
  669                         break;
  670                 }
  671                 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt,
  672                     so->so_fibnum);
  673                 if (error == 0 && saved_nrt) {
  674 #ifdef INET6
  675                         rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  676 #endif
  677                         RT_LOCK(saved_nrt);
  678                         rt_setmetrics(rtm, saved_nrt);
  679                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
  680                         RT_REMREF(saved_nrt);
  681                         RT_UNLOCK(saved_nrt);
  682                 }
  683                 break;
  684 
  685         case RTM_DELETE:
  686                 saved_nrt = NULL;
  687                 /* support for new ARP code */
  688                 if (info.rti_info[RTAX_GATEWAY] && 
  689                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
  690                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
  691                         error = lla_rt_output(rtm, &info);
  692 #ifdef INET6
  693                         if (error == 0)
  694                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  695 #endif
  696                         break;
  697                 }
  698                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt,
  699                     so->so_fibnum);
  700                 if (error == 0) {
  701                         RT_LOCK(saved_nrt);
  702                         rt = saved_nrt;
  703                         goto report;
  704                 }
  705 #ifdef INET6
  706                 /* rt_msg2() will not be used when RTM_DELETE fails. */
  707                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
  708 #endif
  709                 break;
  710 
  711         case RTM_GET:
  712         case RTM_CHANGE:
  713         case RTM_LOCK:
  714                 rnh = rt_tables_get_rnh(so->so_fibnum,
  715                     info.rti_info[RTAX_DST]->sa_family);
  716                 if (rnh == NULL)
  717                         senderr(EAFNOSUPPORT);
  718 
  719                 RADIX_NODE_HEAD_RLOCK(rnh);
  720 
  721                 if (info.rti_info[RTAX_NETMASK] == NULL &&
  722                     rtm->rtm_type == RTM_GET) {
  723                         /*
  724                          * Provide logest prefix match for
  725                          * address lookup (no mask).
  726                          * 'route -n get addr'
  727                          */
  728                         rt = (struct rtentry *) rnh->rnh_matchaddr(
  729                             info.rti_info[RTAX_DST], rnh);
  730                 } else
  731                         rt = (struct rtentry *) rnh->rnh_lookup(
  732                             info.rti_info[RTAX_DST],
  733                             info.rti_info[RTAX_NETMASK], rnh);
  734 
  735                 if (rt == NULL) {
  736                         RADIX_NODE_HEAD_RUNLOCK(rnh);
  737                         senderr(ESRCH);
  738                 }
  739 #ifdef RADIX_MPATH
  740                 /*
  741                  * for RTM_CHANGE/LOCK, if we got multipath routes,
  742                  * we require users to specify a matching RTAX_GATEWAY.
  743                  *
  744                  * for RTM_GET, gate is optional even with multipath.
  745                  * if gate == NULL the first match is returned.
  746                  * (no need to call rt_mpath_matchgate if gate == NULL)
  747                  */
  748                 if (rn_mpath_capable(rnh) &&
  749                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
  750                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
  751                         if (!rt) {
  752                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
  753                                 senderr(ESRCH);
  754                         }
  755                 }
  756 #endif
  757                 /*
  758                  * If performing proxied L2 entry insertion, and
  759                  * the actual PPP host entry is found, perform
  760                  * another search to retrieve the prefix route of
  761                  * the local end point of the PPP link.
  762                  */
  763                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
  764                         struct sockaddr laddr;
  765 
  766                         if (rt->rt_ifp != NULL && 
  767                             rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
  768                                 struct ifaddr *ifa;
  769 
  770                                 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1);
  771                                 if (ifa != NULL)
  772                                         rt_maskedcopy(ifa->ifa_addr,
  773                                                       &laddr,
  774                                                       ifa->ifa_netmask);
  775                         } else
  776                                 rt_maskedcopy(rt->rt_ifa->ifa_addr,
  777                                               &laddr,
  778                                               rt->rt_ifa->ifa_netmask);
  779                         /* 
  780                          * refactor rt and no lock operation necessary
  781                          */
  782                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr, rnh);
  783                         if (rt == NULL) {
  784                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
  785                                 senderr(ESRCH);
  786                         }
  787                 } 
  788                 RT_LOCK(rt);
  789                 RT_ADDREF(rt);
  790                 RADIX_NODE_HEAD_RUNLOCK(rnh);
  791 
  792                 switch(rtm->rtm_type) {
  793 
  794                 case RTM_GET:
  795                 report:
  796                         RT_LOCK_ASSERT(rt);
  797                         if ((rt->rt_flags & RTF_HOST) == 0
  798                             ? jailed_without_vnet(curthread->td_ucred)
  799                             : prison_if(curthread->td_ucred,
  800                             rt_key(rt)) != 0) {
  801                                 RT_UNLOCK(rt);
  802                                 senderr(ESRCH);
  803                         }
  804                         info.rti_info[RTAX_DST] = rt_key(rt);
  805                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  806                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  807                         info.rti_info[RTAX_GENMASK] = 0;
  808                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
  809                                 ifp = rt->rt_ifp;
  810                                 if (ifp) {
  811                                         info.rti_info[RTAX_IFP] =
  812                                             ifp->if_addr->ifa_addr;
  813                                         error = rtm_get_jailed(&info, ifp, rt,
  814                                             &saun, curthread->td_ucred);
  815                                         if (error != 0) {
  816                                                 RT_UNLOCK(rt);
  817                                                 senderr(error);
  818                                         }
  819                                         if (ifp->if_flags & IFF_POINTOPOINT)
  820                                                 info.rti_info[RTAX_BRD] =
  821                                                     rt->rt_ifa->ifa_dstaddr;
  822                                         rtm->rtm_index = ifp->if_index;
  823                                 } else {
  824                                         info.rti_info[RTAX_IFP] = NULL;
  825                                         info.rti_info[RTAX_IFA] = NULL;
  826                                 }
  827                         } else if ((ifp = rt->rt_ifp) != NULL) {
  828                                 rtm->rtm_index = ifp->if_index;
  829                         }
  830                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
  831                         if (len > rtm->rtm_msglen) {
  832                                 struct rt_msghdr *new_rtm;
  833                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
  834                                 if (new_rtm == NULL) {
  835                                         RT_UNLOCK(rt);
  836                                         senderr(ENOBUFS);
  837                                 }
  838                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
  839                                 Free(rtm); rtm = new_rtm;
  840                         }
  841                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
  842                         if (rt->rt_flags & RTF_GWFLAG_COMPAT)
  843                                 rtm->rtm_flags = RTF_GATEWAY | 
  844                                         (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
  845                         else
  846                                 rtm->rtm_flags = rt->rt_flags;
  847                         rt_getmetrics(rt, &rtm->rtm_rmx);
  848                         rtm->rtm_addrs = info.rti_addrs;
  849                         break;
  850 
  851                 case RTM_CHANGE:
  852                         /*
  853                          * New gateway could require new ifaddr, ifp;
  854                          * flags may also be different; ifp may be specified
  855                          * by ll sockaddr when protocol address is ambiguous
  856                          */
  857                         if (((rt->rt_flags & RTF_GATEWAY) &&
  858                              info.rti_info[RTAX_GATEWAY] != NULL) ||
  859                             info.rti_info[RTAX_IFP] != NULL ||
  860                             (info.rti_info[RTAX_IFA] != NULL &&
  861                              !sa_equal(info.rti_info[RTAX_IFA],
  862                                        rt->rt_ifa->ifa_addr))) {
  863                                 RT_UNLOCK(rt);
  864                                 RADIX_NODE_HEAD_LOCK(rnh);
  865                                 error = rt_getifa_fib(&info, rt->rt_fibnum);
  866                                 /*
  867                                  * XXXRW: Really we should release this
  868                                  * reference later, but this maintains
  869                                  * historical behavior.
  870                                  */
  871                                 if (info.rti_ifa != NULL)
  872                                         ifa_free(info.rti_ifa);
  873                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  874                                 if (error != 0)
  875                                         senderr(error);
  876                                 RT_LOCK(rt);
  877                         }
  878                         if (info.rti_ifa != NULL &&
  879                             info.rti_ifa != rt->rt_ifa &&
  880                             rt->rt_ifa != NULL &&
  881                             rt->rt_ifa->ifa_rtrequest != NULL) {
  882                                 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
  883                                     &info);
  884                                 ifa_free(rt->rt_ifa);
  885                         }
  886                         if (info.rti_info[RTAX_GATEWAY] != NULL) {
  887                                 RT_UNLOCK(rt);
  888                                 RADIX_NODE_HEAD_LOCK(rnh);
  889                                 RT_LOCK(rt);
  890                                 
  891                                 error = rt_setgate(rt, rt_key(rt),
  892                                     info.rti_info[RTAX_GATEWAY]);
  893                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  894                                 if (error != 0) {
  895                                         RT_UNLOCK(rt);
  896                                         senderr(error);
  897                                 }
  898                                 rt->rt_flags &= ~RTF_GATEWAY;
  899                                 rt->rt_flags |= (RTF_GATEWAY & info.rti_flags);
  900                         }
  901                         if (info.rti_ifa != NULL &&
  902                             info.rti_ifa != rt->rt_ifa) {
  903                                 ifa_ref(info.rti_ifa);
  904                                 rt->rt_ifa = info.rti_ifa;
  905                                 rt->rt_ifp = info.rti_ifp;
  906                         }
  907                         /* Allow some flags to be toggled on change. */
  908                         rt->rt_flags = (rt->rt_flags & ~RTF_FMASK) |
  909                                     (rtm->rtm_flags & RTF_FMASK);
  910                         rt_setmetrics(rtm, rt);
  911                         rtm->rtm_index = rt->rt_ifp->if_index;
  912                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
  913                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
  914                         /* FALLTHROUGH */
  915                 case RTM_LOCK:
  916                         /* We don't support locks anymore */
  917                         break;
  918                 }
  919                 RT_UNLOCK(rt);
  920                 break;
  921 
  922         default:
  923                 senderr(EOPNOTSUPP);
  924         }
  925 
  926 flush:
  927         if (rtm) {
  928                 if (error)
  929                         rtm->rtm_errno = error;
  930                 else
  931                         rtm->rtm_flags |= RTF_DONE;
  932         }
  933         if (rt)         /* XXX can this be true? */
  934                 RTFREE(rt);
  935     {
  936         struct rawcb *rp = NULL;
  937         /*
  938          * Check to see if we don't want our own messages.
  939          */
  940         if ((so->so_options & SO_USELOOPBACK) == 0) {
  941                 if (route_cb.any_count <= 1) {
  942                         if (rtm)
  943                                 Free(rtm);
  944                         m_freem(m);
  945                         return (error);
  946                 }
  947                 /* There is another listener, so construct message */
  948                 rp = sotorawcb(so);
  949         }
  950         if (rtm) {
  951 #ifdef INET6
  952                 if (rti_need_deembed) {
  953                         /* sin6_scope_id is recovered before sending rtm. */
  954                         sin6 = (struct sockaddr_in6 *)&ss;
  955                         for (i = 0; i < RTAX_MAX; i++) {
  956                                 if (info.rti_info[i] == NULL)
  957                                         continue;
  958                                 if (info.rti_info[i]->sa_family != AF_INET6)
  959                                         continue;
  960                                 bcopy(info.rti_info[i], sin6, sizeof(*sin6));
  961                                 if (sa6_recoverscope(sin6) == 0)
  962                                         bcopy(sin6, info.rti_info[i],
  963                                                     sizeof(*sin6));
  964                         }
  965                 }
  966 #endif
  967                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
  968                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
  969                         m_freem(m);
  970                         m = NULL;
  971                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
  972                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
  973         }
  974         if (m) {
  975                 M_SETFIB(m, so->so_fibnum);
  976                 m->m_flags |= RTS_FILTER_FIB;
  977                 if (rp) {
  978                         /*
  979                          * XXX insure we don't get a copy by
  980                          * invalidating our protocol
  981                          */
  982                         unsigned short family = rp->rcb_proto.sp_family;
  983                         rp->rcb_proto.sp_family = 0;
  984                         rt_dispatch(m, saf);
  985                         rp->rcb_proto.sp_family = family;
  986                 } else
  987                         rt_dispatch(m, saf);
  988         }
  989         /* info.rti_info[RTAX_DST] (used above) can point inside of rtm */
  990         if (rtm)
  991                 Free(rtm);
  992     }
  993         return (error);
  994 #undef  sa_equal
  995 }
  996 
  997 static void
  998 rt_setmetrics(const struct rt_msghdr *rtm, struct rtentry *rt)
  999 {
 1000 
 1001         if (rtm->rtm_inits & RTV_MTU)
 1002                 rt->rt_mtu = rtm->rtm_rmx.rmx_mtu;
 1003         if (rtm->rtm_inits & RTV_WEIGHT)
 1004                 rt->rt_weight = rtm->rtm_rmx.rmx_weight;
 1005         /* Kernel -> userland timebase conversion. */
 1006         if (rtm->rtm_inits & RTV_EXPIRE)
 1007                 rt->rt_expire = rtm->rtm_rmx.rmx_expire ?
 1008                     rtm->rtm_rmx.rmx_expire - time_second + time_uptime : 0;
 1009 }
 1010 
 1011 static void
 1012 rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
 1013 {
 1014 
 1015         bzero(out, sizeof(*out));
 1016         out->rmx_mtu = rt->rt_mtu;
 1017         out->rmx_weight = rt->rt_weight;
 1018         out->rmx_pksent = counter_u64_fetch(rt->rt_pksent);
 1019         /* Kernel -> userland timebase conversion. */
 1020         out->rmx_expire = rt->rt_expire ?
 1021             rt->rt_expire - time_uptime + time_second : 0;
 1022 }
 1023 
 1024 /*
 1025  * Extract the addresses of the passed sockaddrs.
 1026  * Do a little sanity checking so as to avoid bad memory references.
 1027  * This data is derived straight from userland.
 1028  */
 1029 static int
 1030 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 1031 {
 1032         struct sockaddr *sa;
 1033         int i;
 1034 
 1035         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 1036                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 1037                         continue;
 1038                 sa = (struct sockaddr *)cp;
 1039                 /*
 1040                  * It won't fit.
 1041                  */
 1042                 if (cp + sa->sa_len > cplim)
 1043                         return (EINVAL);
 1044                 /*
 1045                  * there are no more.. quit now
 1046                  * If there are more bits, they are in error.
 1047                  * I've seen this. route(1) can evidently generate these. 
 1048                  * This causes kernel to core dump.
 1049                  * for compatibility, If we see this, point to a safe address.
 1050                  */
 1051                 if (sa->sa_len == 0) {
 1052                         rtinfo->rti_info[i] = &sa_zero;
 1053                         return (0); /* should be EINVAL but for compat */
 1054                 }
 1055                 /* accept it */
 1056 #ifdef INET6
 1057                 if (sa->sa_family == AF_INET6)
 1058                         sa6_embedscope((struct sockaddr_in6 *)sa,
 1059                             V_ip6_use_defzone);
 1060 #endif
 1061                 rtinfo->rti_info[i] = sa;
 1062                 cp += SA_SIZE(sa);
 1063         }
 1064         return (0);
 1065 }
 1066 
 1067 /*
 1068  * Used by the routing socket.
 1069  */
 1070 static struct mbuf *
 1071 rt_msg1(int type, struct rt_addrinfo *rtinfo)
 1072 {
 1073         struct rt_msghdr *rtm;
 1074         struct mbuf *m;
 1075         int i;
 1076         struct sockaddr *sa;
 1077 #ifdef INET6
 1078         struct sockaddr_storage ss;
 1079         struct sockaddr_in6 *sin6;
 1080 #endif
 1081         int len, dlen;
 1082 
 1083         switch (type) {
 1084 
 1085         case RTM_DELADDR:
 1086         case RTM_NEWADDR:
 1087                 len = sizeof(struct ifa_msghdr);
 1088                 break;
 1089 
 1090         case RTM_DELMADDR:
 1091         case RTM_NEWMADDR:
 1092                 len = sizeof(struct ifma_msghdr);
 1093                 break;
 1094 
 1095         case RTM_IFINFO:
 1096                 len = sizeof(struct if_msghdr);
 1097                 break;
 1098 
 1099         case RTM_IFANNOUNCE:
 1100         case RTM_IEEE80211:
 1101                 len = sizeof(struct if_announcemsghdr);
 1102                 break;
 1103 
 1104         default:
 1105                 len = sizeof(struct rt_msghdr);
 1106         }
 1107 
 1108         /* XXXGL: can we use MJUMPAGESIZE cluster here? */
 1109         KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
 1110         if (len > MHLEN)
 1111                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 1112         else
 1113                 m = m_gethdr(M_NOWAIT, MT_DATA);
 1114         if (m == NULL)
 1115                 return (m);
 1116 
 1117         m->m_pkthdr.len = m->m_len = len;
 1118         rtm = mtod(m, struct rt_msghdr *);
 1119         bzero((caddr_t)rtm, len);
 1120         for (i = 0; i < RTAX_MAX; i++) {
 1121                 if ((sa = rtinfo->rti_info[i]) == NULL)
 1122                         continue;
 1123                 rtinfo->rti_addrs |= (1 << i);
 1124                 dlen = SA_SIZE(sa);
 1125 #ifdef INET6
 1126                 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
 1127                         sin6 = (struct sockaddr_in6 *)&ss;
 1128                         bcopy(sa, sin6, sizeof(*sin6));
 1129                         if (sa6_recoverscope(sin6) == 0)
 1130                                 sa = (struct sockaddr *)sin6;
 1131                 }
 1132 #endif
 1133                 m_copyback(m, len, dlen, (caddr_t)sa);
 1134                 len += dlen;
 1135         }
 1136         if (m->m_pkthdr.len != len) {
 1137                 m_freem(m);
 1138                 return (NULL);
 1139         }
 1140         rtm->rtm_msglen = len;
 1141         rtm->rtm_version = RTM_VERSION;
 1142         rtm->rtm_type = type;
 1143         return (m);
 1144 }
 1145 
 1146 /*
 1147  * Used by the sysctl code and routing socket.
 1148  */
 1149 static int
 1150 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
 1151 {
 1152         int i;
 1153         int len, dlen, second_time = 0;
 1154         caddr_t cp0;
 1155 #ifdef INET6
 1156         struct sockaddr_storage ss;
 1157         struct sockaddr_in6 *sin6;
 1158 #endif
 1159 
 1160         rtinfo->rti_addrs = 0;
 1161 again:
 1162         switch (type) {
 1163 
 1164         case RTM_DELADDR:
 1165         case RTM_NEWADDR:
 1166                 if (w != NULL && w->w_op == NET_RT_IFLISTL) {
 1167 #ifdef COMPAT_FREEBSD32
 1168                         if (w->w_req->flags & SCTL_MASK32)
 1169                                 len = sizeof(struct ifa_msghdrl32);
 1170                         else
 1171 #endif
 1172                                 len = sizeof(struct ifa_msghdrl);
 1173                 } else
 1174                         len = sizeof(struct ifa_msghdr);
 1175                 break;
 1176 
 1177         case RTM_IFINFO:
 1178 #ifdef COMPAT_FREEBSD32
 1179                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
 1180                         if (w->w_op == NET_RT_IFLISTL)
 1181                                 len = sizeof(struct if_msghdrl32);
 1182                         else
 1183                                 len = sizeof(struct if_msghdr32);
 1184                         break;
 1185                 }
 1186 #endif
 1187                 if (w != NULL && w->w_op == NET_RT_IFLISTL)
 1188                         len = sizeof(struct if_msghdrl);
 1189                 else
 1190                         len = sizeof(struct if_msghdr);
 1191                 break;
 1192 
 1193         case RTM_NEWMADDR:
 1194                 len = sizeof(struct ifma_msghdr);
 1195                 break;
 1196 
 1197         default:
 1198                 len = sizeof(struct rt_msghdr);
 1199         }
 1200         cp0 = cp;
 1201         if (cp0)
 1202                 cp += len;
 1203         for (i = 0; i < RTAX_MAX; i++) {
 1204                 struct sockaddr *sa;
 1205 
 1206                 if ((sa = rtinfo->rti_info[i]) == NULL)
 1207                         continue;
 1208                 rtinfo->rti_addrs |= (1 << i);
 1209                 dlen = SA_SIZE(sa);
 1210                 if (cp) {
 1211 #ifdef INET6
 1212                         if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
 1213                                 sin6 = (struct sockaddr_in6 *)&ss;
 1214                                 bcopy(sa, sin6, sizeof(*sin6));
 1215                                 if (sa6_recoverscope(sin6) == 0)
 1216                                         sa = (struct sockaddr *)sin6;
 1217                         }
 1218 #endif
 1219                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
 1220                         cp += dlen;
 1221                 }
 1222                 len += dlen;
 1223         }
 1224         len = ALIGN(len);
 1225         if (cp == NULL && w != NULL && !second_time) {
 1226                 struct walkarg *rw = w;
 1227 
 1228                 if (rw->w_req) {
 1229                         if (rw->w_tmemsize < len) {
 1230                                 if (rw->w_tmem)
 1231                                         free(rw->w_tmem, M_RTABLE);
 1232                                 rw->w_tmem = (caddr_t)
 1233                                         malloc(len, M_RTABLE, M_NOWAIT);
 1234                                 if (rw->w_tmem)
 1235                                         rw->w_tmemsize = len;
 1236                         }
 1237                         if (rw->w_tmem) {
 1238                                 cp = rw->w_tmem;
 1239                                 second_time = 1;
 1240                                 goto again;
 1241                         }
 1242                 }
 1243         }
 1244         if (cp) {
 1245                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
 1246 
 1247                 rtm->rtm_version = RTM_VERSION;
 1248                 rtm->rtm_type = type;
 1249                 rtm->rtm_msglen = len;
 1250         }
 1251         return (len);
 1252 }
 1253 
 1254 /*
 1255  * This routine is called to generate a message from the routing
 1256  * socket indicating that a redirect has occured, a routing lookup
 1257  * has failed, or that a protocol has detected timeouts to a particular
 1258  * destination.
 1259  */
 1260 void
 1261 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
 1262     int fibnum)
 1263 {
 1264         struct rt_msghdr *rtm;
 1265         struct mbuf *m;
 1266         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
 1267 
 1268         if (route_cb.any_count == 0)
 1269                 return;
 1270         m = rt_msg1(type, rtinfo);
 1271         if (m == NULL)
 1272                 return;
 1273 
 1274         if (fibnum != RT_ALL_FIBS) {
 1275                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
 1276                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
 1277                 M_SETFIB(m, fibnum);
 1278                 m->m_flags |= RTS_FILTER_FIB;
 1279         }
 1280 
 1281         rtm = mtod(m, struct rt_msghdr *);
 1282         rtm->rtm_flags = RTF_DONE | flags;
 1283         rtm->rtm_errno = error;
 1284         rtm->rtm_addrs = rtinfo->rti_addrs;
 1285         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1286 }
 1287 
 1288 void
 1289 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
 1290 {
 1291 
 1292         rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
 1293 }
 1294 
 1295 /*
 1296  * This routine is called to generate a message from the routing
 1297  * socket indicating that the status of a network interface has changed.
 1298  */
 1299 void
 1300 rt_ifmsg(struct ifnet *ifp)
 1301 {
 1302         struct if_msghdr *ifm;
 1303         struct mbuf *m;
 1304         struct rt_addrinfo info;
 1305 
 1306         if (route_cb.any_count == 0)
 1307                 return;
 1308         bzero((caddr_t)&info, sizeof(info));
 1309         m = rt_msg1(RTM_IFINFO, &info);
 1310         if (m == NULL)
 1311                 return;
 1312         ifm = mtod(m, struct if_msghdr *);
 1313         ifm->ifm_index = ifp->if_index;
 1314         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1315         ifm->ifm_data = ifp->if_data;
 1316         ifm->ifm_addrs = 0;
 1317         rt_dispatch(m, AF_UNSPEC);
 1318 }
 1319 
 1320 /*
 1321  * Announce interface address arrival/withdraw.
 1322  * Please do not call directly, use rt_addrmsg().
 1323  * Assume input data to be valid.
 1324  * Returns 0 on success.
 1325  */
 1326 int
 1327 rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
 1328 {
 1329         struct rt_addrinfo info;
 1330         struct sockaddr *sa;
 1331         int ncmd;
 1332         struct mbuf *m;
 1333         struct ifa_msghdr *ifam;
 1334         struct ifnet *ifp = ifa->ifa_ifp;
 1335 
 1336         if (route_cb.any_count == 0)
 1337                 return (0);
 1338 
 1339         ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
 1340 
 1341         bzero((caddr_t)&info, sizeof(info));
 1342         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
 1343         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
 1344         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
 1345         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
 1346         if ((m = rt_msg1(ncmd, &info)) == NULL)
 1347                 return (ENOBUFS);
 1348         ifam = mtod(m, struct ifa_msghdr *);
 1349         ifam->ifam_index = ifp->if_index;
 1350         ifam->ifam_metric = ifa->ifa_metric;
 1351         ifam->ifam_flags = ifa->ifa_flags;
 1352         ifam->ifam_addrs = info.rti_addrs;
 1353 
 1354         if (fibnum != RT_ALL_FIBS) {
 1355                 M_SETFIB(m, fibnum);
 1356                 m->m_flags |= RTS_FILTER_FIB;
 1357         }
 1358 
 1359         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1360 
 1361         return (0);
 1362 }
 1363 
 1364 /*
 1365  * Announce route addition/removal.
 1366  * Please do not call directly, use rt_routemsg().
 1367  * Note that @rt data MAY be inconsistent/invalid:
 1368  * if some userland app sends us "invalid" route message (invalid mask,
 1369  * no dst, wrong address families, etc...) we need to pass it back
 1370  * to app (and any other rtsock consumers) with rtm_errno field set to
 1371  * non-zero value.
 1372  *
 1373  * Returns 0 on success.
 1374  */
 1375 int
 1376 rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
 1377     int fibnum)
 1378 {
 1379         struct rt_addrinfo info;
 1380         struct sockaddr *sa;
 1381         struct mbuf *m;
 1382         struct rt_msghdr *rtm;
 1383 
 1384         if (route_cb.any_count == 0)
 1385                 return (0);
 1386 
 1387         bzero((caddr_t)&info, sizeof(info));
 1388         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 1389         info.rti_info[RTAX_DST] = sa = rt_key(rt);
 1390         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 1391         if ((m = rt_msg1(cmd, &info)) == NULL)
 1392                 return (ENOBUFS);
 1393         rtm = mtod(m, struct rt_msghdr *);
 1394         rtm->rtm_index = ifp->if_index;
 1395         rtm->rtm_flags |= rt->rt_flags;
 1396         rtm->rtm_errno = error;
 1397         rtm->rtm_addrs = info.rti_addrs;
 1398 
 1399         if (fibnum != RT_ALL_FIBS) {
 1400                 M_SETFIB(m, fibnum);
 1401                 m->m_flags |= RTS_FILTER_FIB;
 1402         }
 1403 
 1404         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
 1405 
 1406         return (0);
 1407 }
 1408 
 1409 /*
 1410  * This is the analogue to the rt_newaddrmsg which performs the same
 1411  * function but for multicast group memberhips.  This is easier since
 1412  * there is no route state to worry about.
 1413  */
 1414 void
 1415 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
 1416 {
 1417         struct rt_addrinfo info;
 1418         struct mbuf *m = NULL;
 1419         struct ifnet *ifp = ifma->ifma_ifp;
 1420         struct ifma_msghdr *ifmam;
 1421 
 1422         if (route_cb.any_count == 0)
 1423                 return;
 1424 
 1425         bzero((caddr_t)&info, sizeof(info));
 1426         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
 1427         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
 1428         /*
 1429          * If a link-layer address is present, present it as a ``gateway''
 1430          * (similarly to how ARP entries, e.g., are presented).
 1431          */
 1432         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
 1433         m = rt_msg1(cmd, &info);
 1434         if (m == NULL)
 1435                 return;
 1436         ifmam = mtod(m, struct ifma_msghdr *);
 1437         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
 1438             __func__));
 1439         ifmam->ifmam_index = ifp->if_index;
 1440         ifmam->ifmam_addrs = info.rti_addrs;
 1441         rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
 1442 }
 1443 
 1444 static struct mbuf *
 1445 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
 1446         struct rt_addrinfo *info)
 1447 {
 1448         struct if_announcemsghdr *ifan;
 1449         struct mbuf *m;
 1450 
 1451         if (route_cb.any_count == 0)
 1452                 return NULL;
 1453         bzero((caddr_t)info, sizeof(*info));
 1454         m = rt_msg1(type, info);
 1455         if (m != NULL) {
 1456                 ifan = mtod(m, struct if_announcemsghdr *);
 1457                 ifan->ifan_index = ifp->if_index;
 1458                 strlcpy(ifan->ifan_name, ifp->if_xname,
 1459                         sizeof(ifan->ifan_name));
 1460                 ifan->ifan_what = what;
 1461         }
 1462         return m;
 1463 }
 1464 
 1465 /*
 1466  * This is called to generate routing socket messages indicating
 1467  * IEEE80211 wireless events.
 1468  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
 1469  */
 1470 void
 1471 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
 1472 {
 1473         struct mbuf *m;
 1474         struct rt_addrinfo info;
 1475 
 1476         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
 1477         if (m != NULL) {
 1478                 /*
 1479                  * Append the ieee80211 data.  Try to stick it in the
 1480                  * mbuf containing the ifannounce msg; otherwise allocate
 1481                  * a new mbuf and append.
 1482                  *
 1483                  * NB: we assume m is a single mbuf.
 1484                  */
 1485                 if (data_len > M_TRAILINGSPACE(m)) {
 1486                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
 1487                         if (n == NULL) {
 1488                                 m_freem(m);
 1489                                 return;
 1490                         }
 1491                         bcopy(data, mtod(n, void *), data_len);
 1492                         n->m_len = data_len;
 1493                         m->m_next = n;
 1494                 } else if (data_len > 0) {
 1495                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
 1496                         m->m_len += data_len;
 1497                 }
 1498                 if (m->m_flags & M_PKTHDR)
 1499                         m->m_pkthdr.len += data_len;
 1500                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
 1501                 rt_dispatch(m, AF_UNSPEC);
 1502         }
 1503 }
 1504 
 1505 /*
 1506  * This is called to generate routing socket messages indicating
 1507  * network interface arrival and departure.
 1508  */
 1509 void
 1510 rt_ifannouncemsg(struct ifnet *ifp, int what)
 1511 {
 1512         struct mbuf *m;
 1513         struct rt_addrinfo info;
 1514 
 1515         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
 1516         if (m != NULL)
 1517                 rt_dispatch(m, AF_UNSPEC);
 1518 }
 1519 
 1520 static void
 1521 rt_dispatch(struct mbuf *m, sa_family_t saf)
 1522 {
 1523         struct m_tag *tag;
 1524 
 1525         /*
 1526          * Preserve the family from the sockaddr, if any, in an m_tag for
 1527          * use when injecting the mbuf into the routing socket buffer from
 1528          * the netisr.
 1529          */
 1530         if (saf != AF_UNSPEC) {
 1531                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
 1532                     M_NOWAIT);
 1533                 if (tag == NULL) {
 1534                         m_freem(m);
 1535                         return;
 1536                 }
 1537                 *(unsigned short *)(tag + 1) = saf;
 1538                 m_tag_prepend(m, tag);
 1539         }
 1540 #ifdef VIMAGE
 1541         if (V_loif)
 1542                 m->m_pkthdr.rcvif = V_loif;
 1543         else {
 1544                 m_freem(m);
 1545                 return;
 1546         }
 1547 #endif
 1548         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
 1549 }
 1550 
 1551 /*
 1552  * This is used in dumping the kernel table via sysctl().
 1553  */
 1554 static int
 1555 sysctl_dumpentry(struct radix_node *rn, void *vw)
 1556 {
 1557         struct walkarg *w = vw;
 1558         struct rtentry *rt = (struct rtentry *)rn;
 1559         int error = 0, size;
 1560         struct rt_addrinfo info;
 1561 
 1562         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
 1563                 return 0;
 1564         if ((rt->rt_flags & RTF_HOST) == 0
 1565             ? jailed_without_vnet(w->w_req->td->td_ucred)
 1566             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
 1567                 return (0);
 1568         bzero((caddr_t)&info, sizeof(info));
 1569         info.rti_info[RTAX_DST] = rt_key(rt);
 1570         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 1571         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 1572         info.rti_info[RTAX_GENMASK] = 0;
 1573         if (rt->rt_ifp) {
 1574                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
 1575                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 1576                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
 1577                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
 1578         }
 1579         size = rt_msg2(RTM_GET, &info, NULL, w);
 1580         if (w->w_req && w->w_tmem) {
 1581                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
 1582 
 1583                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
 1584                         rtm->rtm_flags = RTF_GATEWAY | 
 1585                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
 1586                 else
 1587                         rtm->rtm_flags = rt->rt_flags;
 1588                 rt_getmetrics(rt, &rtm->rtm_rmx);
 1589                 rtm->rtm_index = rt->rt_ifp->if_index;
 1590                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
 1591                 rtm->rtm_addrs = info.rti_addrs;
 1592                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
 1593                 return (error);
 1594         }
 1595         return (error);
 1596 }
 1597 
 1598 #ifdef COMPAT_FREEBSD32
 1599 static void
 1600 copy_ifdata32(struct if_data *src, struct if_data32 *dst)
 1601 {
 1602 
 1603         bzero(dst, sizeof(*dst));
 1604         CP(*src, *dst, ifi_type);
 1605         CP(*src, *dst, ifi_physical);
 1606         CP(*src, *dst, ifi_addrlen);
 1607         CP(*src, *dst, ifi_hdrlen);
 1608         CP(*src, *dst, ifi_link_state);
 1609         CP(*src, *dst, ifi_vhid);
 1610         CP(*src, *dst, ifi_baudrate_pf);
 1611         dst->ifi_datalen = sizeof(struct if_data32);
 1612         CP(*src, *dst, ifi_mtu);
 1613         CP(*src, *dst, ifi_metric);
 1614         CP(*src, *dst, ifi_baudrate);
 1615         CP(*src, *dst, ifi_ipackets);
 1616         CP(*src, *dst, ifi_ierrors);
 1617         CP(*src, *dst, ifi_opackets);
 1618         CP(*src, *dst, ifi_oerrors);
 1619         CP(*src, *dst, ifi_collisions);
 1620         CP(*src, *dst, ifi_ibytes);
 1621         CP(*src, *dst, ifi_obytes);
 1622         CP(*src, *dst, ifi_imcasts);
 1623         CP(*src, *dst, ifi_omcasts);
 1624         CP(*src, *dst, ifi_iqdrops);
 1625         CP(*src, *dst, ifi_noproto);
 1626         CP(*src, *dst, ifi_hwassist);
 1627         CP(*src, *dst, ifi_epoch);
 1628         TV_CP(*src, *dst, ifi_lastchange);
 1629 }
 1630 #endif
 1631 
 1632 static int
 1633 sysctl_iflist_ifml(struct ifnet *ifp, struct rt_addrinfo *info,
 1634     struct walkarg *w, int len)
 1635 {
 1636         struct if_msghdrl *ifm;
 1637 
 1638 #ifdef COMPAT_FREEBSD32
 1639         if (w->w_req->flags & SCTL_MASK32) {
 1640                 struct if_msghdrl32 *ifm32;
 1641 
 1642                 ifm32 = (struct if_msghdrl32 *)w->w_tmem;
 1643                 ifm32->ifm_addrs = info->rti_addrs;
 1644                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1645                 ifm32->ifm_index = ifp->if_index;
 1646                 ifm32->_ifm_spare1 = 0;
 1647                 ifm32->ifm_len = sizeof(*ifm32);
 1648                 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
 1649 
 1650                 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
 1651                 /* Fixup if_data carp(4) vhid. */
 1652                 if (carp_get_vhid_p != NULL)
 1653                         ifm32->ifm_data.ifi_vhid =
 1654                             (*carp_get_vhid_p)(ifp->if_addr);
 1655                 ifm32->ifm_data.ifi_oqdrops = ifp->if_snd.ifq_drops;
 1656 
 1657                 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
 1658         }
 1659 #endif
 1660         ifm = (struct if_msghdrl *)w->w_tmem;
 1661         ifm->ifm_addrs = info->rti_addrs;
 1662         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1663         ifm->ifm_index = ifp->if_index;
 1664         ifm->_ifm_spare1 = 0;
 1665         ifm->ifm_len = sizeof(*ifm);
 1666         ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
 1667 
 1668         ifm->ifm_data = ifp->if_data;
 1669         /* Fixup if_data carp(4) vhid. */
 1670         if (carp_get_vhid_p != NULL)
 1671                 ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
 1672 
 1673         ifm->ifm_data.ifi_datalen += sizeof(u_long);
 1674         ifm->ifi_oqdrops = ifp->if_snd.ifq_drops;
 1675 
 1676         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
 1677 }
 1678 
 1679 static int
 1680 sysctl_iflist_ifm(struct ifnet *ifp, struct rt_addrinfo *info,
 1681     struct walkarg *w, int len)
 1682 {
 1683         struct if_msghdr *ifm;
 1684 
 1685 #ifdef COMPAT_FREEBSD32
 1686         if (w->w_req->flags & SCTL_MASK32) {
 1687                 struct if_msghdr32 *ifm32;
 1688 
 1689                 ifm32 = (struct if_msghdr32 *)w->w_tmem;
 1690                 ifm32->ifm_addrs = info->rti_addrs;
 1691                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1692                 ifm32->ifm_index = ifp->if_index;
 1693 
 1694                 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
 1695                 /* Fixup if_data carp(4) vhid. */
 1696                 if (carp_get_vhid_p != NULL)
 1697                         ifm32->ifm_data.ifi_vhid =
 1698                             (*carp_get_vhid_p)(ifp->if_addr);
 1699 
 1700                 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
 1701         }
 1702 #endif
 1703         ifm = (struct if_msghdr *)w->w_tmem;
 1704         ifm->ifm_addrs = info->rti_addrs;
 1705         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 1706         ifm->ifm_index = ifp->if_index;
 1707 
 1708         ifm->ifm_data = ifp->if_data;
 1709         /* Fixup if_data carp(4) vhid. */
 1710         if (carp_get_vhid_p != NULL)
 1711                 ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
 1712 
 1713         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
 1714 }
 1715 
 1716 static int
 1717 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
 1718     struct walkarg *w, int len)
 1719 {
 1720         struct ifa_msghdrl *ifam;
 1721 
 1722 #ifdef COMPAT_FREEBSD32
 1723         if (w->w_req->flags & SCTL_MASK32) {
 1724                 struct ifa_msghdrl32 *ifam32;
 1725 
 1726                 ifam32 = (struct ifa_msghdrl32 *)w->w_tmem;
 1727                 ifam32->ifam_addrs = info->rti_addrs;
 1728                 ifam32->ifam_flags = ifa->ifa_flags;
 1729                 ifam32->ifam_index = ifa->ifa_ifp->if_index;
 1730                 ifam32->_ifam_spare1 = 0;
 1731                 ifam32->ifam_len = sizeof(*ifam32);
 1732                 ifam32->ifam_data_off =
 1733                     offsetof(struct ifa_msghdrl32, ifam_data);
 1734                 ifam32->ifam_metric = ifa->ifa_metric;
 1735 
 1736                 copy_ifdata32(&ifa->ifa_ifp->if_data, &ifam32->ifam_data);
 1737                 /* Fixup if_data carp(4) vhid. */
 1738                 if (carp_get_vhid_p != NULL)
 1739                         ifam32->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
 1740 
 1741                 return (SYSCTL_OUT(w->w_req, (caddr_t)ifam32, len));
 1742         }
 1743 #endif
 1744 
 1745         ifam = (struct ifa_msghdrl *)w->w_tmem;
 1746         ifam->ifam_addrs = info->rti_addrs;
 1747         ifam->ifam_flags = ifa->ifa_flags;
 1748         ifam->ifam_index = ifa->ifa_ifp->if_index;
 1749         ifam->_ifam_spare1 = 0;
 1750         ifam->ifam_len = sizeof(*ifam);
 1751         ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
 1752         ifam->ifam_metric = ifa->ifa_metric;
 1753 
 1754         ifam->ifam_data = ifa->if_data;
 1755         /* Fixup if_data carp(4) vhid. */
 1756         if (carp_get_vhid_p != NULL)
 1757                 ifam->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
 1758 
 1759         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
 1760 }
 1761 
 1762 static int
 1763 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
 1764     struct walkarg *w, int len)
 1765 {
 1766         struct ifa_msghdr *ifam;
 1767 
 1768         ifam = (struct ifa_msghdr *)w->w_tmem;
 1769         ifam->ifam_addrs = info->rti_addrs;
 1770         ifam->ifam_flags = ifa->ifa_flags;
 1771         ifam->ifam_index = ifa->ifa_ifp->if_index;
 1772         ifam->ifam_metric = ifa->ifa_metric;
 1773 
 1774         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
 1775 }
 1776 
 1777 static int
 1778 sysctl_iflist(int af, struct walkarg *w)
 1779 {
 1780         struct ifnet *ifp;
 1781         struct ifaddr *ifa;
 1782         struct rt_addrinfo info;
 1783         int len, error = 0;
 1784 
 1785         bzero((caddr_t)&info, sizeof(info));
 1786         IFNET_RLOCK_NOSLEEP();
 1787         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1788                 if (w->w_arg && w->w_arg != ifp->if_index)
 1789                         continue;
 1790                 IF_ADDR_RLOCK(ifp);
 1791                 ifa = ifp->if_addr;
 1792                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
 1793                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
 1794                 info.rti_info[RTAX_IFP] = NULL;
 1795                 if (w->w_req && w->w_tmem) {
 1796                         if (w->w_op == NET_RT_IFLISTL)
 1797                                 error = sysctl_iflist_ifml(ifp, &info, w, len);
 1798                         else
 1799                                 error = sysctl_iflist_ifm(ifp, &info, w, len);
 1800                         if (error)
 1801                                 goto done;
 1802                 }
 1803                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
 1804                         if (af && af != ifa->ifa_addr->sa_family)
 1805                                 continue;
 1806                         if (prison_if(w->w_req->td->td_ucred,
 1807                             ifa->ifa_addr) != 0)
 1808                                 continue;
 1809                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
 1810                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
 1811                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
 1812                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
 1813                         if (w->w_req && w->w_tmem) {
 1814                                 if (w->w_op == NET_RT_IFLISTL)
 1815                                         error = sysctl_iflist_ifaml(ifa, &info,
 1816                                             w, len);
 1817                                 else
 1818                                         error = sysctl_iflist_ifam(ifa, &info,
 1819                                             w, len);
 1820                                 if (error)
 1821                                         goto done;
 1822                         }
 1823                 }
 1824                 IF_ADDR_RUNLOCK(ifp);
 1825                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
 1826                         info.rti_info[RTAX_BRD] = NULL;
 1827         }
 1828 done:
 1829         if (ifp != NULL)
 1830                 IF_ADDR_RUNLOCK(ifp);
 1831         IFNET_RUNLOCK_NOSLEEP();
 1832         return (error);
 1833 }
 1834 
 1835 static int
 1836 sysctl_ifmalist(int af, struct walkarg *w)
 1837 {
 1838         struct ifnet *ifp;
 1839         struct ifmultiaddr *ifma;
 1840         struct  rt_addrinfo info;
 1841         int     len, error = 0;
 1842         struct ifaddr *ifa;
 1843 
 1844         bzero((caddr_t)&info, sizeof(info));
 1845         IFNET_RLOCK_NOSLEEP();
 1846         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1847                 if (w->w_arg && w->w_arg != ifp->if_index)
 1848                         continue;
 1849                 ifa = ifp->if_addr;
 1850                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
 1851                 IF_ADDR_RLOCK(ifp);
 1852                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 1853                         if (af && af != ifma->ifma_addr->sa_family)
 1854                                 continue;
 1855                         if (prison_if(w->w_req->td->td_ucred,
 1856                             ifma->ifma_addr) != 0)
 1857                                 continue;
 1858                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
 1859                         info.rti_info[RTAX_GATEWAY] =
 1860                             (ifma->ifma_addr->sa_family != AF_LINK) ?
 1861                             ifma->ifma_lladdr : NULL;
 1862                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
 1863                         if (w->w_req && w->w_tmem) {
 1864                                 struct ifma_msghdr *ifmam;
 1865 
 1866                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
 1867                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
 1868                                 ifmam->ifmam_flags = 0;
 1869                                 ifmam->ifmam_addrs = info.rti_addrs;
 1870                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
 1871                                 if (error) {
 1872                                         IF_ADDR_RUNLOCK(ifp);
 1873                                         goto done;
 1874                                 }
 1875                         }
 1876                 }
 1877                 IF_ADDR_RUNLOCK(ifp);
 1878         }
 1879 done:
 1880         IFNET_RUNLOCK_NOSLEEP();
 1881         return (error);
 1882 }
 1883 
 1884 static int
 1885 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
 1886 {
 1887         int     *name = (int *)arg1;
 1888         u_int   namelen = arg2;
 1889         struct radix_node_head *rnh = NULL; /* silence compiler. */
 1890         int     i, lim, error = EINVAL;
 1891         int     fib = 0;
 1892         u_char  af;
 1893         struct  walkarg w;
 1894 
 1895         name ++;
 1896         namelen--;
 1897         if (req->newptr)
 1898                 return (EPERM);
 1899         if (name[1] == NET_RT_DUMP) {
 1900                 if (namelen == 3)
 1901                         fib = req->td->td_proc->p_fibnum;
 1902                 else if (namelen == 4)
 1903                         fib = (name[3] == RT_ALL_FIBS) ?
 1904                             req->td->td_proc->p_fibnum : name[3];
 1905                 else
 1906                         return ((namelen < 3) ? EISDIR : ENOTDIR);
 1907                 if (fib < 0 || fib >= rt_numfibs)
 1908                         return (EINVAL);
 1909         } else if (namelen != 3)
 1910                 return ((namelen < 3) ? EISDIR : ENOTDIR);
 1911         af = name[0];
 1912         if (af > AF_MAX)
 1913                 return (EINVAL);
 1914         bzero(&w, sizeof(w));
 1915         w.w_op = name[1];
 1916         w.w_arg = name[2];
 1917         w.w_req = req;
 1918 
 1919         error = sysctl_wire_old_buffer(req, 0);
 1920         if (error)
 1921                 return (error);
 1922         switch (w.w_op) {
 1923 
 1924         case NET_RT_DUMP:
 1925         case NET_RT_FLAGS:
 1926                 if (af == 0) {                  /* dump all tables */
 1927                         i = 1;
 1928                         lim = AF_MAX;
 1929                 } else                          /* dump only one table */
 1930                         i = lim = af;
 1931 
 1932                 /*
 1933                  * take care of llinfo entries, the caller must
 1934                  * specify an AF
 1935                  */
 1936                 if (w.w_op == NET_RT_FLAGS &&
 1937                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
 1938                         if (af != 0)
 1939                                 error = lltable_sysctl_dumparp(af, w.w_req);
 1940                         else
 1941                                 error = EINVAL;
 1942                         break;
 1943                 }
 1944                 /*
 1945                  * take care of routing entries
 1946                  */
 1947                 for (error = 0; error == 0 && i <= lim; i++) {
 1948                         rnh = rt_tables_get_rnh(fib, i);
 1949                         if (rnh != NULL) {
 1950                                 RADIX_NODE_HEAD_RLOCK(rnh); 
 1951                                 error = rnh->rnh_walktree(rnh,
 1952                                     sysctl_dumpentry, &w);
 1953                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 1954                         } else if (af != 0)
 1955                                 error = EAFNOSUPPORT;
 1956                 }
 1957                 break;
 1958 
 1959         case NET_RT_IFLIST:
 1960         case NET_RT_IFLISTL:
 1961                 error = sysctl_iflist(af, &w);
 1962                 break;
 1963 
 1964         case NET_RT_IFMALIST:
 1965                 error = sysctl_ifmalist(af, &w);
 1966                 break;
 1967         }
 1968         if (w.w_tmem)
 1969                 free(w.w_tmem, M_RTABLE);
 1970         return (error);
 1971 }
 1972 
 1973 static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
 1974 
 1975 /*
 1976  * Definitions of protocols supported in the ROUTE domain.
 1977  */
 1978 
 1979 static struct domain routedomain;               /* or at least forward */
 1980 
 1981 static struct protosw routesw[] = {
 1982 {
 1983         .pr_type =              SOCK_RAW,
 1984         .pr_domain =            &routedomain,
 1985         .pr_flags =             PR_ATOMIC|PR_ADDR,
 1986         .pr_output =            route_output,
 1987         .pr_ctlinput =          raw_ctlinput,
 1988         .pr_init =              raw_init,
 1989         .pr_usrreqs =           &route_usrreqs
 1990 }
 1991 };
 1992 
 1993 static struct domain routedomain = {
 1994         .dom_family =           PF_ROUTE,
 1995         .dom_name =              "route",
 1996         .dom_protosw =          routesw,
 1997         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
 1998 };
 1999 
 2000 VNET_DOMAIN_SET(route);

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