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Annotation of sys/netinet6/dest6.c, Revision 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: }