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1 /*

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 /* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */

29 /* $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $ */

31 /*

34 *

35 * Redistribution and use in source and binary forms, with or without

36 * modification, are permitted provided that the following conditions

37 * are met:

38 * 1. Redistributions of source code must retain the above copyright

39 * notice, this list of conditions and the following disclaimer.

40 * 2. Redistributions in binary form must reproduce the above copyright

41 * notice, this list of conditions and the following disclaimer in the

42 * documentation and/or other materials provided with the distribution.

43 * 3. Neither the name of the project nor the names of its contributors

44 * may be used to endorse or promote products derived from this software

45 * without specific prior written permission.

46 *

47 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND

48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

50 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE

51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

57 * SUCH DAMAGE.

58 */

60 #include <sys/param.h>

61 #include <sys/systm.h>

62 #include <sys/malloc.h>

63 #include <sys/mbuf.h>

64 #include <sys/domain.h>

65 #include <sys/protosw.h>

66 #include <sys/socket.h>

67 #include <sys/errno.h>

68 #include <sys/time.h>

69 #include <sys/kernel.h>

71 #include <net/if.h>

72 #include <net/route.h>

74 #include <netinet/in.h>

75 #include <netinet/in_var.h>

76 #include <netinet/ip6.h>

77 #include <netinet6/ip6_var.h>

78 #include <netinet/icmp6.h>

80 /*

81 * Destination options header processing.

82 */

83 int

 dest6_input(struct mbuf **mp, int *offp, int proto)

85 {

86 #pragma unused(proto)

87 struct mbuf *m = *mp;

         int off = *offp, dstoptlen = 0, optlen = 0;

89 struct ip6_dest *dstopts = NULL;

90 u_int8_t *opt = NULL;

92 /* validation of the length of the header */

         IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);

         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);

         dstoptlen = (dstopts->ip6d_len + 1) << 3;

         IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);

         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);

99 off += dstoptlen;

         dstoptlen -= sizeof(struct ip6_dest);

         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);

102

103 /* search header for all options. */

         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {

105 if (*opt != IP6OPT_PAD1 &&

                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {

107 ip6stat.ip6s_toosmall++;

108 goto bad;

109 }

110

111 switch (*opt) {

112 case IP6OPT_PAD1:

113 optlen = 1;

114 break;

115 case IP6OPT_PADN:

                         optlen = *(opt + 1) + 2;

117 break;

118

119 default: /* unknown option */

                         optlen = ip6_unknown_opt(opt, m,

                             opt - mtod(m, u_int8_t *));

                         if (optlen == -1) {

123 return IPPROTO_DONE;

124 }

125 optlen += 2;

126 break;

127 }

128 }

129 *mp = m;

130 *offp = off;

131 return dstopts->ip6d_nxt;

132

133 bad:

134 *mp = NULL;

135 m_freem(m);

136 return IPPROTO_DONE;

137 }