IABSD.fr/src/sys/netinet6/dest6.c

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• Author : jsg
  Date : 2025-07-08 00:47:41
  Hash : 148caabb
  Message : remove unneeded includes; ok bluhm@

• sys/netinet6/dest6.c

• /*	$OpenBSD: dest6.c,v 1.24 2025/07/08 00:47:41 jsg Exp $	*/
  /*	$KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $	*/
  
  /*
   * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/mbuf.h>
  #include <sys/socket.h>
  
  #include <net/route.h>
  
  #include <netinet/in.h>
  #include <netinet/ip6.h>
  #include <netinet6/ip6_var.h>
  
  /*
   * Destination options header processing.
   */
  int
  dest6_input(struct mbuf **mp, int *offp, int proto, int af,
      struct netstack *ns)
  {
  	int off = *offp, dstoptlen, optlen;
  	struct ip6_dest *dstopts;
  	u_int8_t *opt;
  
  	/* validation of the length of the header */
  	dstopts = ip6_exthdr_get(mp, off, sizeof(*dstopts));
  	if (dstopts == NULL)
  		return IPPROTO_DONE;
  	dstoptlen = (dstopts->ip6d_len + 1) << 3;
  
  	dstopts = ip6_exthdr_get(mp, off, dstoptlen);
  	if (dstopts == NULL)
  		return IPPROTO_DONE;
  	off += dstoptlen;
  	dstoptlen -= sizeof(struct ip6_dest);
  	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
  
  	/* search header for all options. */
  	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
  		if (*opt != IP6OPT_PAD1 &&
  		    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
  			ip6stat_inc(ip6s_toosmall);
  			goto bad;
  		}
  
  		switch (*opt) {
  		case IP6OPT_PAD1:
  			optlen = 1;
  			break;
  		case IP6OPT_PADN:
  			optlen = *(opt + 1) + 2;
  			break;
  		default:		/* unknown option */
  			optlen = ip6_unknown_opt(mp, opt,
  			    opt - mtod(*mp, u_int8_t *));
  			if (optlen == -1)
  				return (IPPROTO_DONE);
  			optlen += 2;
  			break;
  		}
  	}
  
  	*offp = off;
  	return (dstopts->ip6d_nxt);
  
    bad:
  	m_freemp(mp);
  	return (IPPROTO_DONE);
  }