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Annotation of sys/netinet6/dest6.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: dest6.c,v 1.10 2003/05/14 14:24:44 itojun Exp $       */
                      2: /*     $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $  */
                      3:
                      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #include <sys/param.h>
                     34: #include <sys/systm.h>
                     35: #include <sys/malloc.h>
                     36: #include <sys/mbuf.h>
                     37: #include <sys/domain.h>
                     38: #include <sys/protosw.h>
                     39: #include <sys/socket.h>
                     40: #include <sys/errno.h>
                     41: #include <sys/time.h>
                     42: #include <sys/kernel.h>
                     43:
                     44: #include <net/if.h>
                     45: #include <net/route.h>
                     46:
                     47: #include <netinet/in.h>
                     48: #include <netinet/in_var.h>
                     49: #include <netinet/ip6.h>
                     50: #include <netinet6/ip6_var.h>
                     51: #include <netinet/icmp6.h>
                     52:
                     53: /*
                     54:  * Destination options header processing.
                     55:  */
                     56: int
                     57: dest6_input(mp, offp, proto)
                     58:        struct mbuf **mp;
                     59:        int *offp, proto;
                     60: {
                     61:        struct mbuf *m = *mp;
                     62:        int off = *offp, dstoptlen, optlen;
                     63:        struct ip6_dest *dstopts;
                     64:        u_int8_t *opt;
                     65:
                     66:        /* validation of the length of the header */
                     67:        IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
                     68:        if (dstopts == NULL)
                     69:                return IPPROTO_DONE;
                     70:        dstoptlen = (dstopts->ip6d_len + 1) << 3;
                     71:
                     72:        IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
                     73:        if (dstopts == NULL)
                     74:                return IPPROTO_DONE;
                     75:        off += dstoptlen;
                     76:        dstoptlen -= sizeof(struct ip6_dest);
                     77:        opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
                     78:
                     79:        /* search header for all options. */
                     80:        for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
                     81:                if (*opt != IP6OPT_PAD1 &&
                     82:                    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
                     83:                        ip6stat.ip6s_toosmall++;
                     84:                        goto bad;
                     85:                }
                     86:
                     87:                switch (*opt) {
                     88:                case IP6OPT_PAD1:
                     89:                        optlen = 1;
                     90:                        break;
                     91:                case IP6OPT_PADN:
                     92:                        optlen = *(opt + 1) + 2;
                     93:                        break;
                     94:                default:                /* unknown option */
                     95:                        optlen = ip6_unknown_opt(opt, m,
                     96:                            opt - mtod(m, u_int8_t *));
                     97:                        if (optlen == -1)
                     98:                                return (IPPROTO_DONE);
                     99:                        optlen += 2;
                    100:                        break;
                    101:                }
                    102:        }
                    103:
                    104:        *offp = off;
                    105:        return (dstopts->ip6d_nxt);
                    106:
                    107:   bad:
                    108:        m_freem(m);
                    109:        return (IPPROTO_DONE);
                    110: }