bsd/netinet6/route6.c

   1 /*
   2  * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  31  * All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. Neither the name of the project nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #include <sys/param.h>
  59 #include <sys/mcache.h>
  60 #include <sys/mbuf.h>
  61 #include <sys/socket.h>
  62 #include <sys/queue.h>
  63 #include <kern/debug.h>
  64 #include <string.h>
  65
  66 #include <net/if.h>
  67 #include <net/route.h>
  68
  69 #include <netinet/in.h>
  70 #include <netinet6/in6_var.h>
  71 #include <netinet/ip6.h>
  72 #include <netinet6/ip6_var.h>
  73
  74 #include <netinet/icmp6.h>
  75
  76 int
  77 route6_input(struct mbuf **mp, int *offp, int proto)
  78 {
  79 #pragma unused(proto)
  80         struct ip6_hdr *ip6 = NULL;
  81         struct mbuf *m = *mp;
  82         struct ip6_rthdr *rh = NULL;
  83         int off = *offp, rhlen = 0;
  84 #ifdef notyet
  85         struct ip6aux *ip6a = NULL;
  86
  87         ip6a = ip6_findaux(m);
  88         if (ip6a) {
  89                 /* XXX reject home-address option before rthdr */
  90                 if (ip6a->ip6a_flags & IP6A_SWAP) {
  91                         ip6stat.ip6s_badoptions++;
  92                         *mp = NULL;
  93                         m_freem(m);
  94                         return IPPROTO_DONE;
  95                 }
  96         }
  97         ip6a = NULL;
  98 #endif /* notyet */
  99
 100         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), return IPPROTO_DONE);
 101
 102         /* Expect 32-bit aligned data pointer on strict-align platforms */
 103         MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
 104
 105         ip6 = mtod(m, struct ip6_hdr *);
 106         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
 107
 108         switch (rh->ip6r_type) {
 109         default:
 110                 /* unknown routing type */
 111                 if (rh->ip6r_segleft == 0) {
 112                         rhlen = (rh->ip6r_len + 1) << 3;
 113                         break;  /* Final dst. Just ignore the header. */
 114                 }
 115                 ip6stat.ip6s_badoptions++;
 116                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
 117                     (int)((caddr_t)&rh->ip6r_type - (caddr_t)ip6));
 118                 return IPPROTO_DONE;
 119         }
 120
 121         *mp = m;
 122         *offp += rhlen;
 123         return rh->ip6r_nxt;
 124 }