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/netinet6/in6_rmx.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * 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  * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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  *      $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
   30  */
   31 
   32 /*-
   33  * Copyright 1994, 1995 Massachusetts Institute of Technology
   34  *
   35  * Permission to use, copy, modify, and distribute this software and
   36  * its documentation for any purpose and without fee is hereby
   37  * granted, provided that both the above copyright notice and this
   38  * permission notice appear in all copies, that both the above
   39  * copyright notice and this permission notice appear in all
   40  * supporting documentation, and that the name of M.I.T. not be used
   41  * in advertising or publicity pertaining to distribution of the
   42  * software without specific, written prior permission.  M.I.T. makes
   43  * no representations about the suitability of this software for any
   44  * purpose.  It is provided "as is" without express or implied
   45  * warranty.
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   48  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   49  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   50  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   51  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   52  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   53  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   54  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   55  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   56  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   57  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  */
   61 
   62 #include <sys/cdefs.h>
   63 __FBSDID("$FreeBSD: stable/8/sys/netinet6/in6_rmx.c 243629 2012-11-27 20:16:37Z melifaro $");
   64 
   65 #include <sys/param.h>
   66 #include <sys/systm.h>
   67 #include <sys/kernel.h>
   68 #include <sys/lock.h>
   69 #include <sys/sysctl.h>
   70 #include <sys/queue.h>
   71 #include <sys/socket.h>
   72 #include <sys/socketvar.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/rwlock.h>
   75 #include <sys/syslog.h>
   76 #include <sys/callout.h>
   77 
   78 #include <net/if.h>
   79 #include <net/route.h>
   80 
   81 #include <netinet/in.h>
   82 #include <netinet/ip_var.h>
   83 #include <netinet/in_var.h>
   84 
   85 #include <netinet/ip6.h>
   86 #include <netinet6/ip6_var.h>
   87 
   88 #include <netinet/icmp6.h>
   89 #include <netinet6/nd6.h>
   90 
   91 #include <netinet/tcp.h>
   92 #include <netinet/tcp_seq.h>
   93 #include <netinet/tcp_timer.h>
   94 #include <netinet/tcp_var.h>
   95 
   96 extern int      in6_inithead(void **head, int off);
   97 #ifdef VIMAGE
   98 extern int      in6_detachhead(void **head, int off);
   99 #endif
  100 
  101 /*
  102  * Do what we need to do when inserting a route.
  103  */
  104 static struct radix_node *
  105 in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
  106     struct radix_node *treenodes)
  107 {
  108         struct rtentry *rt = (struct rtentry *)treenodes;
  109         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
  110         struct radix_node *ret;
  111 
  112         RADIX_NODE_HEAD_WLOCK_ASSERT(head);
  113         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
  114                 rt->rt_flags |= RTF_MULTICAST;
  115 
  116         /*
  117          * A little bit of help for both IPv6 output and input:
  118          *   For local addresses, we make sure that RTF_LOCAL is set,
  119          *   with the thought that this might one day be used to speed up
  120          *   ip_input().
  121          *
  122          * We also mark routes to multicast addresses as such, because
  123          * it's easy to do and might be useful (but this is much more
  124          * dubious since it's so easy to inspect the address).  (This
  125          * is done above.)
  126          *
  127          * XXX
  128          * should elaborate the code.
  129          */
  130         if (rt->rt_flags & RTF_HOST) {
  131                 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
  132                                         ->sin6_addr,
  133                                        &sin6->sin6_addr)) {
  134                         rt->rt_flags |= RTF_LOCAL;
  135                 }
  136         }
  137 
  138         if (!rt->rt_rmx.rmx_mtu && rt->rt_ifp)
  139                 rt->rt_rmx.rmx_mtu = IN6_LINKMTU(rt->rt_ifp);
  140 
  141         ret = rn_addroute(v_arg, n_arg, head, treenodes);
  142         if (ret == NULL) {
  143                 struct rtentry *rt2;
  144                 /*
  145                  * We are trying to add a net route, but can't.
  146                  * The following case should be allowed, so we'll make a
  147                  * special check for this:
  148                  *      Two IPv6 addresses with the same prefix is assigned
  149                  *      to a single interrface.
  150                  *      # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
  151                  *      # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
  152                  *      In this case, (*1) and (*2) want to add the same
  153                  *      net route entry, 3ffe:0501:: -> if0.
  154                  *      This case should not raise an error.
  155                  */
  156                 rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED,
  157                     rt->rt_fibnum);
  158                 if (rt2) {
  159                         if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0)
  160                          && rt2->rt_gateway
  161                          && rt2->rt_gateway->sa_family == AF_LINK
  162                          && rt2->rt_ifp == rt->rt_ifp) {
  163                                 ret = rt2->rt_nodes;
  164                         }
  165                         RTFREE_LOCKED(rt2);
  166                 }
  167         }
  168         return (ret);
  169 }
  170 
  171 SYSCTL_DECL(_net_inet6_ip6);
  172 
  173 static VNET_DEFINE(int, rtq_toomany6) = 128;
  174         /* 128 cached routes is ``too many'' */
  175 #define V_rtq_toomany6                  VNET(rtq_toomany6)
  176 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW,
  177     &VNET_NAME(rtq_toomany6) , 0, "");
  178 
  179 struct rtqk_arg {
  180         struct radix_node_head *rnh;
  181         int mode;
  182         int updating;
  183         int draining;
  184         int killed;
  185         int found;
  186         time_t nextstop;
  187 };
  188 
  189 /*
  190  * Age old PMTUs.
  191  */
  192 struct mtuex_arg {
  193         struct radix_node_head *rnh;
  194         time_t nextstop;
  195 };
  196 static VNET_DEFINE(struct callout, rtq_mtutimer);
  197 #define V_rtq_mtutimer                  VNET(rtq_mtutimer)
  198 
  199 static int
  200 in6_mtuexpire(struct radix_node *rn, void *rock)
  201 {
  202         struct rtentry *rt = (struct rtentry *)rn;
  203         struct mtuex_arg *ap = rock;
  204 
  205         /* sanity */
  206         if (!rt)
  207                 panic("rt == NULL in in6_mtuexpire");
  208 
  209         if (rt->rt_rmx.rmx_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
  210                 if (rt->rt_rmx.rmx_expire <= time_uptime) {
  211                         rt->rt_flags |= RTF_PROBEMTU;
  212                 } else {
  213                         ap->nextstop = lmin(ap->nextstop,
  214                                         rt->rt_rmx.rmx_expire);
  215                 }
  216         }
  217 
  218         return 0;
  219 }
  220 
  221 #define MTUTIMO_DEFAULT (60*1)
  222 
  223 static void
  224 in6_mtutimo_one(struct radix_node_head *rnh)
  225 {
  226         struct mtuex_arg arg;
  227 
  228         arg.rnh = rnh;
  229         arg.nextstop = time_uptime + MTUTIMO_DEFAULT;
  230         RADIX_NODE_HEAD_LOCK(rnh);
  231         rnh->rnh_walktree(rnh, in6_mtuexpire, &arg);
  232         RADIX_NODE_HEAD_UNLOCK(rnh);
  233 }
  234 
  235 static void
  236 in6_mtutimo(void *rock)
  237 {
  238         CURVNET_SET_QUIET((struct vnet *) rock);
  239         struct radix_node_head *rnh;
  240         struct timeval atv;
  241         u_int fibnum;
  242 
  243         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
  244                 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
  245                 if (rnh != NULL)
  246                         in6_mtutimo_one(rnh);
  247         }
  248 
  249         atv.tv_sec = MTUTIMO_DEFAULT;
  250         atv.tv_usec = 0;
  251         callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
  252         CURVNET_RESTORE();
  253 }
  254 
  255 /*
  256  * Initialize our routing tree.
  257  * XXX MRT When off == 0, we are being called from vfs_export.c
  258  * so just set up their table and leave. (we know what the correct
  259  * value should be so just use that).. FIX AFTER RELENG_7 is MFC'd
  260  * see also comments in in_inithead() vfs_export.c and domain.h
  261  */
  262 static VNET_DEFINE(int, _in6_rt_was_here);
  263 #define V__in6_rt_was_here      VNET(_in6_rt_was_here)
  264 
  265 int
  266 in6_inithead(void **head, int off)
  267 {
  268         struct radix_node_head *rnh;
  269 
  270         if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3))
  271                 return 0;               /* See above */
  272 
  273         if (off == 0)           /* See above */
  274                 return 1;       /* only do the rest for the real thing */
  275 
  276         rnh = *head;
  277         rnh->rnh_addaddr = in6_addroute;
  278 
  279         if (V__in6_rt_was_here == 0) {
  280                 callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE);
  281                 in6_mtutimo(curvnet);   /* kick off timeout first time */
  282                 V__in6_rt_was_here = 1;
  283         }
  284 
  285         return 1;
  286 }
  287 
  288 #ifdef VIMAGE
  289 int
  290 in6_detachhead(void **head, int off)
  291 {
  292 
  293         callout_drain(&V_rtq_mtutimer);
  294         return (1);
  295 }
  296 #endif
  297 
  298 /*
  299  * Extended API for IPv6 FIB support.
  300  */
  301 void
  302 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
  303     int flags, struct sockaddr *src, u_int fibnum)
  304 {
  305 
  306         rtredirect_fib(dst, gw, nm, flags, src, fibnum);
  307 }
  308 
  309 int
  310 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
  311     struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
  312 {
  313 
  314         return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
  315 }
  316 
  317 void
  318 in6_rtalloc(struct route_in6 *ro, u_int fibnum)
  319 {
  320 
  321         rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
  322 }
  323 
  324 void
  325 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
  326 {
  327 
  328         rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
  329 }
  330 
  331 struct rtentry *
  332 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
  333 {
  334 
  335         return (rtalloc1_fib(dst, report, ignflags, fibnum));
  336 }

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