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("$FreeBSD$");
    
    #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/route_ctl.h>
    #include <net/route/route_var.h>
    #include <net/route/nhop.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>
   
   static int
   rib6_set_nh_pfxflags(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
       struct nhop_object *nh)
   {
           const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask;
   
           if (mask6 == NULL)
                   nhop_set_pxtype_flag(nh, NHF_HOST);
           else if (IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr))
                   nhop_set_pxtype_flag(nh, NHF_DEFAULT);
           else
                   nhop_set_pxtype_flag(nh, 0);
   
           return (0);
   }
   
   static int
   rib6_augment_nh(u_int fibnum, struct nhop_object *nh)
   {
           /*
            * Check route MTU:
            * inherit interface MTU if not set or
            * check if MTU is too large.
            */
           if (nh->nh_mtu == 0) {
                   nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
           } else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp))
                   nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
   
           /* Set nexthop type */
           if (nhop_get_type(nh) == 0) {
                   uint16_t nh_type;
                   if (nh->nh_flags & NHF_GATEWAY)
                           nh_type = NH_TYPE_IPV6_ETHER_NHOP;
                   else
                           nh_type = NH_TYPE_IPV6_ETHER_RSLV;
   
                   nhop_set_type(nh, nh_type);
           }
   
           return (0);
   }
   
   /*
    * Initialize our routing tree.
    */
   
   struct rib_head *
   in6_inithead(uint32_t fibnum)
   {
           struct rib_head *rh;
           struct rib_subscription *rs;
   
           rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3,
               AF_INET6, fibnum);
           if (rh == NULL)
                   return (NULL);
   
           rh->rnh_set_nh_pfxflags = rib6_set_nh_pfxflags;
           rh->rnh_augment_nh = rib6_augment_nh;
   
           rs = rib_subscribe_internal(rh, nd6_subscription_cb, NULL,
               RIB_NOTIFY_IMMEDIATE, true);
           KASSERT(rs != NULL, ("Unable to subscribe to fib %u\n", fibnum));
   
           return (rh);
   }
   
   #ifdef VIMAGE
   void
   in6_detachhead(struct rib_head *rh)
   {
   
           rt_table_destroy(rh);
   }
   #endif

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