2 /* $KAME: dest6.c,v 1.34 2002/01/08 02:40:55 k-sugyou Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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9 * modification, are permitted provided that the following conditions
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17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
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34 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
45 #include <sys/kernel.h>
48 #include <net/route.h>
50 #include <netinet/in.h>
51 #include <netinet/in_var.h>
52 #include <netinet/ip6.h>
53 #include <netinet6/ip6_var.h>
54 #include <netinet/icmp6.h>
57 * Destination options header processing.
60 dest6_input(mp, offp, proto)
65 int off = *offp, dstoptlen, optlen;
66 struct ip6_dest *dstopts;
70 ip6 = mtod(m, struct ip6_hdr *);
72 /* validation of the length of the header */
74 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
75 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
77 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
81 dstoptlen = (dstopts->ip6d_len + 1) << 3;
84 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
85 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
87 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
92 dstoptlen -= sizeof(struct ip6_dest);
93 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
95 /* search header for all options. */
96 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
97 if (*opt != IP6OPT_PAD1 &&
98 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
99 ip6stat.ip6s_toosmall++;
108 optlen = *(opt + 1) + 2;
111 default: /* unknown option */
112 optlen = ip6_unknown_opt(opt, m,
113 opt - mtod(m, u_int8_t *));
115 return (IPPROTO_DONE);
122 return (dstopts->ip6d_nxt);
126 return (IPPROTO_DONE);