FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_rmx.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
     */
    
    /*-
     * Copyright 1994, 1995 Massachusetts Institute of Technology
     *
     * Permission to use, copy, modify, and distribute this software and
     * its documentation for any purpose and without fee is hereby
     * granted, provided that both the above copyright notice and this
     * permission notice appear in all copies, that both the above
     * copyright notice and this permission notice appear in all
     * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     *
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
     * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/in6_rmx.c 336676 2018-07-24 16:35:52Z andrew $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/queue.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/mbuf.h>
    #include <sys/rwlock.h>
    #include <sys/syslog.h>
    #include <sys/callout.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/route.h>
    #include <net/route_var.h>
    
    #include <netinet/in.h>
    #include <netinet/ip_var.h>
    #include <netinet/in_var.h>
    
    #include <netinet/ip6.h>
    #include <netinet6/ip6_var.h>
    
    #include <netinet/icmp6.h>
    #include <netinet6/nd6.h>
    
    #include <netinet/tcp.h>
    #include <netinet/tcp_seq.h>
    #include <netinet/tcp_timer.h>
    #include <netinet/tcp_var.h>
    
    extern int      in6_inithead(void **head, int off);
   #ifdef VIMAGE
   extern int      in6_detachhead(void **head, int off);
   #endif
   
   /*
    * Do what we need to do when inserting a route.
    */
   static struct radix_node *
   in6_addroute(void *v_arg, void *n_arg, struct radix_head *head,
       struct radix_node *treenodes)
   {
           struct rtentry *rt = (struct rtentry *)treenodes;
           struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
   
           if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
                   rt->rt_flags |= RTF_MULTICAST;
   
           /*
            * A little bit of help for both IPv6 output and input:
            *   For local addresses, we make sure that RTF_LOCAL is set,
            *   with the thought that this might one day be used to speed up
            *   ip_input().
            *
            * We also mark routes to multicast addresses as such, because
            * it's easy to do and might be useful (but this is much more
            * dubious since it's so easy to inspect the address).  (This
            * is done above.)
            *
            * XXX
            * should elaborate the code.
            */
           if (rt->rt_flags & RTF_HOST) {
                   if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
                                           ->sin6_addr,
                                          &sin6->sin6_addr)) {
                           rt->rt_flags |= RTF_LOCAL;
                   }
           }
   
           if (rt->rt_ifp != NULL) {
   
                   /*
                    * Check route MTU:
                    * inherit interface MTU if not set or
                    * check if MTU is too large.
                    */
                   if (rt->rt_mtu == 0) {
                           rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
                   } else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp))
                           rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
           }
   
           return (rn_addroute(v_arg, n_arg, head, treenodes));
   }
   
   /*
    * Age old PMTUs.
    */
   struct mtuex_arg {
           struct rib_head *rnh;
           time_t nextstop;
   };
   VNET_DEFINE_STATIC(struct callout, rtq_mtutimer);
   #define V_rtq_mtutimer                  VNET(rtq_mtutimer)
   
   static int
   in6_mtuexpire(struct rtentry *rt, void *rock)
   {
           struct mtuex_arg *ap = rock;
   
           if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
                   if (rt->rt_expire <= time_uptime) {
                           rt->rt_flags |= RTF_PROBEMTU;
                   } else {
                           ap->nextstop = lmin(ap->nextstop, rt->rt_expire);
                   }
           }
   
           return (0);
   }
   
   #define MTUTIMO_DEFAULT (60*1)
   
   static void
   in6_mtutimo_setwa(struct rib_head *rnh, uint32_t fibum, int af,
       void *_arg)
   {
           struct mtuex_arg *arg;
   
           arg = (struct mtuex_arg *)_arg;
   
           arg->rnh = rnh;
   }
   
   static void
   in6_mtutimo(void *rock)
   {
           CURVNET_SET_QUIET((struct vnet *) rock);
           struct timeval atv;
           struct mtuex_arg arg;
   
           rt_foreach_fib_walk(AF_INET6, in6_mtutimo_setwa, in6_mtuexpire, &arg);
   
           atv.tv_sec = MTUTIMO_DEFAULT;
           atv.tv_usec = 0;
           callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
           CURVNET_RESTORE();
   }
   
   /*
    * Initialize our routing tree.
    */
   VNET_DEFINE_STATIC(int, _in6_rt_was_here);
   #define V__in6_rt_was_here      VNET(_in6_rt_was_here)
   
   int
   in6_inithead(void **head, int off)
   {
           struct rib_head *rh;
   
           rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3);
           if (rh == NULL)
                   return (0);
   
           rh->rnh_addaddr = in6_addroute;
           *head = (void *)rh;
   
           if (V__in6_rt_was_here == 0) {
                   callout_init(&V_rtq_mtutimer, 1);
                   in6_mtutimo(curvnet);   /* kick off timeout first time */
                   V__in6_rt_was_here = 1;
           }
   
           return (1);
   }
   
   #ifdef VIMAGE
   int
   in6_detachhead(void **head, int off)
   {
   
           callout_drain(&V_rtq_mtutimer);
           rt_table_destroy((struct rib_head *)(*head));
   
           return (1);
   }
   #endif
   
   /*
    * Extended API for IPv6 FIB support.
    */
   void
   in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
       int flags, struct sockaddr *src, u_int fibnum)
   {
   
           rtredirect_fib(dst, gw, nm, flags, src, fibnum);
   }
   
   int
   in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
       struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
   {
   
           return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
   }
   
   void
   in6_rtalloc(struct route_in6 *ro, u_int fibnum)
   {
   
           rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
   }
   
   void
   in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
   {
   
           rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
   }
   
   struct rtentry *
   in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
   {
   
           return (rtalloc1_fib(dst, report, ignflags, fibnum));
   }

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