diff options
Diffstat (limited to 'sys/netinet6/in6_src.c')
| -rw-r--r-- | sys/netinet6/in6_src.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/sys/netinet6/in6_src.c b/sys/netinet6/in6_src.c new file mode 100644 index 00000000000..2f222592ca4 --- /dev/null +++ b/sys/netinet6/in6_src.c @@ -0,0 +1,346 @@ +/* $OpenBSD: in6_src.c,v 1.1 1999/12/08 06:50:21 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. + */ + +/* + * Copyright (c) 1982, 1986, 1991, 1993 + * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. + * + * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 + */ + +#ifdef __NetBSD__ /*XXX*/ +#include "opt_ipsec.h" +#endif + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/protosw.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/ioctl.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/proc.h> + +#include <net/if.h> +#include <net/route.h> + +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <netinet/in_pcb.h> +#include <netinet6/in6_var.h> +#include <netinet6/ip6.h> +#if 0 +#include <netinet6/in6_pcb.h> +#endif +#include <netinet6/ip6_var.h> +#include <netinet6/nd6.h> + +#ifndef __bsdi__ +#include "loop.h" +#endif +#if defined(__NetBSD__) || defined(__OpenBSD__) +extern struct ifnet loif[NLOOP]; +#endif + +/* + * Return an IPv6 address, which is the most appropriate for given + * destination and user specified options. + * If necessary, this function lookups the routing table and return + * an entry to the caller for later use. + */ +struct in6_addr * +in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) + struct sockaddr_in6 *dstsock; + struct ip6_pktopts *opts; + struct ip6_moptions *mopts; + struct route_in6 *ro; + struct in6_addr *laddr; + int *errorp; +{ + struct in6_addr *dst; + struct in6_ifaddr *ia6 = 0; + struct in6_pktinfo *pi = NULL; + + dst = &dstsock->sin6_addr; + *errorp = 0; + + /* + * If the source address is explicitly specified by the caller, + * use it. + */ + if (opts && (pi = opts->ip6po_pktinfo) && + !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) + return(&pi->ipi6_addr); + + /* + * If the source address is not specified but the socket(if any) + * is already bound, use the bound address. + */ + if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) + return(laddr); + + /* + * If the caller doesn't specify the source address but + * the outgoing interface, use an address associated with + * the interface. + */ + if (pi && pi->ipi6_ifindex) { + /* XXX boundary check is assumed to be already done. */ + ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], + dst); + if (ia6 == 0) { + *errorp = EADDRNOTAVAIL; + return(0); + } + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } + + /* + * If the destination address is a link-local unicast address or + * a multicast address, and if the outgoing interface is specified + * by the sin6_scope_id filed, use an address associated with the + * interface. + * XXX: We're now trying to define more specific semantics of + * sin6_scope_id field, so this part will be rewritten in + * the near future. + */ + if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && + dstsock->sin6_scope_id) { + /* + * I'm not sure if boundary check for scope_id is done + * somewhere... + */ + if (dstsock->sin6_scope_id < 0 || + if_index < dstsock->sin6_scope_id) { + *errorp = ENXIO; /* XXX: better error? */ + return(0); + } + ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], + dst); + if (ia6 == 0) { + *errorp = EADDRNOTAVAIL; + return(0); + } + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } + + /* + * If the destination address is a multicast address and + * the outgoing interface for the address is specified + * by the caller, use an address associated with the interface. + * There is a sanity check here; if the destination has node-local + * scope, the outgoing interfacde should be a loopback address. + * Even if the outgoing interface is not specified, we also + * choose a loopback interface as the outgoing interface. + */ + if (IN6_IS_ADDR_MULTICAST(dst)) { + struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; +#ifdef __bsdi__ +#if _BSDI_VERSION >= 199802 + extern struct ifnet *loifp; +#else + extern struct ifnet loif; + struct ifnet *loifp = &loif; +#endif +#endif + + if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { +#ifdef __bsdi__ + ifp = loifp; +#else + ifp = &loif[0]; +#endif + } + + if (ifp) { + ia6 = in6_ifawithscope(ifp, dst); + if (ia6 == 0) { + *errorp = EADDRNOTAVAIL; + return(0); + } + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } + } + + /* + * If the next hop address for the packet is specified + * by caller, use an address associated with the route + * to the next hop. + */ + { + struct sockaddr_in6 *sin6_next; + struct rtentry *rt; + + if (opts && opts->ip6po_nexthop) { + sin6_next = satosin6(opts->ip6po_nexthop); + rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); + if (rt) { + ia6 = in6_ifawithscope(rt->rt_ifp, dst); + if (ia6 == 0) + ia6 = ifatoia6(rt->rt_ifa); + } + if (ia6 == 0) { + *errorp = EADDRNOTAVAIL; + return(0); + } + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } + } + + /* + * If route is known or can be allocated now, + * our src addr is taken from the i/f, else punt. + */ + if (ro) { + if (ro->ro_rt && + !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { + RTFREE(ro->ro_rt); + ro->ro_rt = (struct rtentry *)0; + } + if (ro->ro_rt == (struct rtentry *)0 || + ro->ro_rt->rt_ifp == (struct ifnet *)0) { + /* No route yet, so try to acquire one */ + bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); + ro->ro_dst.sin6_family = AF_INET6; + ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6); + ro->ro_dst.sin6_addr = *dst; + if (IN6_IS_ADDR_MULTICAST(dst)) { +#ifdef __FreeBSD__ + ro->ro_rt = rtalloc1(&((struct route *)ro) + ->ro_dst, 0, 0UL); +#endif /*__FreeBSD__*/ +#if defined(__bsdi__) || defined(__NetBSD__) + ro->ro_rt = rtalloc1(&((struct route *)ro) + ->ro_dst, 0); +#endif /*__bsdi__*/ + } else { +#ifdef __FreeBSD__ + rtcalloc((struct route *)ro); +#else + rtalloc((struct route *)ro); +#endif + } + } + + /* + * in_pcbconnect() checks out IFF_LOOPBACK to skip using + * the address. But we don't know why it does so. + * It is necessary to ensure the scope even for lo0 + * so doesn't check out IFF_LOOPBACK. + */ + + if (ro->ro_rt) { + ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); + if (ia6 == 0) /* xxx scope error ?*/ + ia6 = ifatoia6(ro->ro_rt->rt_ifa); + } +#if 0 + /* + * xxx The followings are necessary? (kazu) + * I don't think so. + * It's for SO_DONTROUTE option in IPv4.(jinmei) + */ + if (ia6 == 0) { + struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0}; + + sin6->sin6_addr = *dst; + + ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6))); + if (ia6 == 0) + ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6))); + if (ia6 == 0) + return(0); + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } +#endif /* 0 */ + if (ia6 == 0) { + *errorp = EHOSTUNREACH; /* no route */ + return(0); + } + return(&satosin6(&ia6->ia_addr)->sin6_addr); + } + + *errorp = EADDRNOTAVAIL; + return(0); +} + +/* + * Default hop limit selection. The precedence is as follows: + * 1. Hoplimit valued specified via ioctl. + * 2. (If the outgoing interface is detected) the current + * hop limit of the interface specified by router advertisement. + * 3. The system default hoplimit. +*/ +int +in6_selecthlim(inp, ifp) + struct inpcb *inp; + struct ifnet *ifp; +{ + if (inp && inp->inp_hops >= 0) + return(inp->inp_hops); + else if (ifp) + return(nd_ifinfo[ifp->if_index].chlim); + else + return(ip6_defhlim); +} |