diff options
Diffstat (limited to 'sys/netinet6/route6.c')
| -rw-r--r-- | sys/netinet6/route6.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/sys/netinet6/route6.c b/sys/netinet6/route6.c new file mode 100644 index 0000000..f2575bc --- /dev/null +++ b/sys/netinet6/route6.c @@ -0,0 +1,221 @@ +/* $FreeBSD$ */ +/* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 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 "opt_inet.h" +#include "opt_inet6.h" + +#include <sys/param.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/systm.h> +#include <sys/queue.h> + +#include <net/if.h> + +#include <netinet/in.h> +#include <netinet6/in6_var.h> +#include <netinet/ip6.h> +#include <netinet6/ip6_var.h> + +#include <netinet/icmp6.h> + +static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *, + struct ip6_rthdr0 *)); + +int +route6_input(mp, offp, proto) + struct mbuf **mp; + int *offp, proto; /* proto is unused */ +{ + struct ip6_hdr *ip6; + struct mbuf *m = *mp; + struct ip6_rthdr *rh; + int off = *offp, rhlen; + struct ip6aux *ip6a; + + ip6a = ip6_findaux(m); + if (ip6a) { + /* XXX reject home-address option before rthdr */ + if (ip6a->ip6a_flags & IP6A_SWAP) { + ip6stat.ip6s_badoptions++; + m_freem(m); + return IPPROTO_DONE; + } + } + +#ifndef PULLDOWN_TEST + IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); + ip6 = mtod(m, struct ip6_hdr *); + rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); +#else + ip6 = mtod(m, struct ip6_hdr *); + IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); + if (rh == NULL) { + ip6stat.ip6s_tooshort++; + return IPPROTO_DONE; + } +#endif + + switch (rh->ip6r_type) { + case IPV6_RTHDR_TYPE_0: + rhlen = (rh->ip6r_len + 1) << 3; +#ifndef PULLDOWN_TEST + /* + * note on option length: + * due to IP6_EXTHDR_CHECK assumption, we cannot handle + * very big routing header (max rhlen == 2048). + */ + IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE); +#else + /* + * note on option length: + * maximum rhlen: 2048 + * max mbuf m_pulldown can handle: MCLBYTES == usually 2048 + * so, here we are assuming that m_pulldown can handle + * rhlen == 2048 case. this may not be a good thing to + * assume - we may want to avoid pulling it up altogether. + */ + IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen); + if (rh == NULL) { + ip6stat.ip6s_tooshort++; + return IPPROTO_DONE; + } +#endif + if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh)) + return(IPPROTO_DONE); + break; + default: + /* unknown routing type */ + if (rh->ip6r_segleft == 0) { + rhlen = (rh->ip6r_len + 1) << 3; + break; /* Final dst. Just ignore the header. */ + } + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, + (caddr_t)&rh->ip6r_type - (caddr_t)ip6); + return(IPPROTO_DONE); + } + + *offp += rhlen; + return(rh->ip6r_nxt); +} + +/* + * Type0 routing header processing + * + * RFC2292 backward compatibility warning: no support for strict/loose bitmap, + * as it was dropped between RFC1883 and RFC2460. + */ +static int +ip6_rthdr0(m, ip6, rh0) + struct mbuf *m; + struct ip6_hdr *ip6; + struct ip6_rthdr0 *rh0; +{ + int addrs, index; + struct in6_addr *nextaddr, tmpaddr; + + if (rh0->ip6r0_segleft == 0) + return(0); + + if (rh0->ip6r0_len % 2 +#ifdef COMPAT_RFC1883 + || rh0->ip6r0_len > 46 +#endif + ) { + /* + * Type 0 routing header can't contain more than 23 addresses. + * RFC 2462: this limitation was removed since strict/loose + * bitmap field was deleted. + */ + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, + (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6); + return(-1); + } + + if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) { + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, + (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6); + return(-1); + } + + index = addrs - rh0->ip6r0_segleft; + rh0->ip6r0_segleft--; + /* note that ip6r0_addr does not exist in RFC2292bis */ + nextaddr = rh0->ip6r0_addr + index; + + /* + * reject invalid addresses. be proactive about malicious use of + * IPv4 mapped/compat address. + * XXX need more checks? + */ + if (IN6_IS_ADDR_MULTICAST(nextaddr) || + IN6_IS_ADDR_UNSPECIFIED(nextaddr) || + IN6_IS_ADDR_V4MAPPED(nextaddr) || + IN6_IS_ADDR_V4COMPAT(nextaddr)) { + ip6stat.ip6s_badoptions++; + m_freem(m); + return(-1); + } + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || + IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) || + IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) || + IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { + ip6stat.ip6s_badoptions++; + m_freem(m); + return(-1); + } + + /* + * Swap the IPv6 destination address and nextaddr. Forward the packet. + */ + tmpaddr = *nextaddr; + *nextaddr = ip6->ip6_dst; + if (IN6_IS_ADDR_LINKLOCAL(nextaddr)) + nextaddr->s6_addr16[1] = 0; + ip6->ip6_dst = tmpaddr; + if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) + ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); + +#ifdef COMPAT_RFC1883 + if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8)))) + ip6_forward(m, IPV6_SRCRT_NEIGHBOR); + else + ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR); +#else + ip6_forward(m, 1); +#endif + + return(-1); /* m would be freed in ip6_forward() */ +} |
