529 lines
15 KiB
C
529 lines
15 KiB
C
/* $NetBSD: in6_src.c,v 1.15 2002/09/11 02:46:45 itojun Exp $ */
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/* $KAME: in6_src.c,v 1.36 2001/02/06 04:08:17 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: in6_src.c,v 1.15 2002/09/11 02:46:45 itojun Exp $");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#ifdef ENABLE_DEFAULT_SCOPE
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#include <netinet6/scope6_var.h>
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#endif
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#include <net/net_osdep.h>
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#include "loop.h"
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extern struct ifnet loif[NLOOP];
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/*
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* Return an IPv6 address, which is the most appropriate for a given
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* destination and user specified options.
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* If necessary, this function lookups the routing table and returns
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* an entry to the caller for later use.
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*/
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struct in6_addr *
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in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
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struct sockaddr_in6 *dstsock;
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struct ip6_pktopts *opts;
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struct ip6_moptions *mopts;
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struct route_in6 *ro;
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struct in6_addr *laddr;
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int *errorp;
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{
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struct in6_addr *dst;
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struct in6_ifaddr *ia6 = 0;
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struct in6_pktinfo *pi = NULL;
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dst = &dstsock->sin6_addr;
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*errorp = 0;
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/*
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* If the source address is explicitly specified by the caller,
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* use it.
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*/
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if (opts && (pi = opts->ip6po_pktinfo) &&
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!IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
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return (&pi->ipi6_addr);
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/*
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* If the source address is not specified but the socket(if any)
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* is already bound, use the bound address.
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*/
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if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
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return (laddr);
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/*
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* If the caller doesn't specify the source address but
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* the outgoing interface, use an address associated with
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* the interface.
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*/
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if (pi && pi->ipi6_ifindex) {
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/* XXX boundary check is assumed to be already done. */
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ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
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dst);
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if (ia6 == 0) {
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*errorp = EADDRNOTAVAIL;
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return (0);
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}
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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/*
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* If the destination address is a link-local unicast address or
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* a multicast address, and if the outgoing interface is specified
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* by the sin6_scope_id filed, use an address associated with the
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* interface.
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* XXX: We're now trying to define more specific semantics of
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* sin6_scope_id field, so this part will be rewritten in
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* the near future.
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*/
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if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
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dstsock->sin6_scope_id) {
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/*
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* I'm not sure if boundary check for scope_id is done
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* somewhere...
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*/
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if (dstsock->sin6_scope_id < 0 ||
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if_index < dstsock->sin6_scope_id) {
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*errorp = ENXIO; /* XXX: better error? */
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return (0);
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}
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ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
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dst);
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if (ia6 == 0) {
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*errorp = EADDRNOTAVAIL;
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return (0);
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}
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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/*
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* If the destination address is a multicast address and
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* the outgoing interface for the address is specified
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* by the caller, use an address associated with the interface.
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* There is a sanity check here; if the destination has node-local
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* scope, the outgoing interfacde should be a loopback address.
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* Even if the outgoing interface is not specified, we also
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* choose a loopback interface as the outgoing interface.
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*/
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if (IN6_IS_ADDR_MULTICAST(dst)) {
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struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
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if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
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ifp = &loif[0];
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}
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if (ifp) {
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ia6 = in6_ifawithscope(ifp, dst);
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if (ia6 == 0) {
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*errorp = EADDRNOTAVAIL;
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return (0);
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}
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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}
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/*
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* If the next hop address for the packet is specified
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* by caller, use an address associated with the route
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* to the next hop.
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*/
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{
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struct sockaddr_in6 *sin6_next;
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struct rtentry *rt;
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if (opts && opts->ip6po_nexthop) {
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sin6_next = satosin6(opts->ip6po_nexthop);
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rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
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if (rt) {
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ia6 = in6_ifawithscope(rt->rt_ifp, dst);
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if (ia6 == 0)
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ia6 = ifatoia6(rt->rt_ifa);
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}
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if (ia6 == 0) {
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*errorp = EADDRNOTAVAIL;
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return (0);
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}
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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}
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/*
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* If route is known or can be allocated now,
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* our src addr is taken from the i/f, else punt.
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* Note that we should check the address family of the
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* cached destination, in case of sharing the cache with IPv4.
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*/
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if (ro) {
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if (ro->ro_rt &&
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(ro->ro_dst.sin6_family != AF_INET6 ||
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!IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst))) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = (struct rtentry *)0;
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}
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if (ro->ro_rt == (struct rtentry *)0 ||
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ro->ro_rt->rt_ifp == (struct ifnet *)0) {
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struct sockaddr_in6 *sa6;
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/* No route yet, so try to acquire one */
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bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
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sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
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sa6->sin6_family = AF_INET6;
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sa6->sin6_len = sizeof(struct sockaddr_in6);
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sa6->sin6_addr = *dst;
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sa6->sin6_scope_id = dstsock->sin6_scope_id;
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if (IN6_IS_ADDR_MULTICAST(dst)) {
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ro->ro_rt = rtalloc1(&((struct route *)ro)
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->ro_dst, 0);
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} else {
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rtalloc((struct route *)ro);
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}
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}
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/*
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* in_pcbconnect() checks out IFF_LOOPBACK to skip using
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* the address. But we don't know why it does so.
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* It is necessary to ensure the scope even for lo0
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* so doesn't check out IFF_LOOPBACK.
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*/
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if (ro->ro_rt) {
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ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
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if (ia6 == 0) /* xxx scope error ?*/
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ia6 = ifatoia6(ro->ro_rt->rt_ifa);
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}
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#if 0
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/*
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* xxx The followings are necessary? (kazu)
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* I don't think so.
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* It's for SO_DONTROUTE option in IPv4.(jinmei)
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*/
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if (ia6 == 0) {
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struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0};
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sin6->sin6_addr = *dst;
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ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6)));
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if (ia6 == 0)
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ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6)));
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if (ia6 == 0)
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return (0);
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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#endif /* 0 */
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if (ia6 == 0) {
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*errorp = EHOSTUNREACH; /* no route */
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return (0);
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}
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return (&satosin6(&ia6->ia_addr)->sin6_addr);
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}
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*errorp = EADDRNOTAVAIL;
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return (0);
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}
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/*
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* Default hop limit selection. The precedence is as follows:
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* 1. Hoplimit value specified via ioctl.
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* 2. (If the outgoing interface is detected) the current
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* hop limit of the interface specified by router advertisement.
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* 3. The system default hoplimit.
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*/
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int
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in6_selecthlim(in6p, ifp)
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struct in6pcb *in6p;
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struct ifnet *ifp;
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{
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if (in6p && in6p->in6p_hops >= 0)
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return (in6p->in6p_hops);
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else if (ifp)
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return (ND_IFINFO(ifp)->chlim);
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else
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return (ip6_defhlim);
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}
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/*
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* Find an empty port and set it to the specified PCB.
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*/
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int
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in6_pcbsetport(laddr, in6p, p)
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struct in6_addr *laddr;
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struct in6pcb *in6p;
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struct proc *p;
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{
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struct socket *so = in6p->in6p_socket;
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struct in6pcb *head = in6p->in6p_head;
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u_int16_t last_port, lport = 0;
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int wild = 0;
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void *t;
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u_int16_t min, max;
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/* XXX: this is redundant when called from in6_pcbbind */
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if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
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((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
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(so->so_options & SO_ACCEPTCONN) == 0))
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wild = IN6PLOOKUP_WILDCARD;
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if (in6p->in6p_flags & IN6P_LOWPORT) {
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#ifndef IPNOPRIVPORTS
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if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
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return (EACCES);
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#endif
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min = ip6_lowportmin;
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max = ip6_lowportmax;
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} else {
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min = ip6_anonportmin;
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max = ip6_anonportmax;
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}
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/* value out of range */
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if (head->in6p_lport < min)
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head->in6p_lport = min;
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else if (head->in6p_lport > max)
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head->in6p_lport = min;
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last_port = head->in6p_lport;
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goto startover; /*to randomize*/
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for (;;) {
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lport = htons(head->in6p_lport);
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if (IN6_IS_ADDR_V4MAPPED(laddr)) {
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#if 0
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t = in_pcblookup_bind(&tcbtable,
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(struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
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lport);
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#else
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t = NULL;
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#endif
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} else {
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t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
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lport, wild);
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}
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if (t == 0)
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break;
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startover:
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if (head->in6p_lport >= max)
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head->in6p_lport = min;
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else
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head->in6p_lport++;
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if (head->in6p_lport == last_port)
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return (EADDRINUSE);
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}
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in6p->in6p_lport = lport;
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return (0); /* success */
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}
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/*
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* generate kernel-internal form (scopeid embedded into s6_addr16[1]).
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* If the address scope of is link-local, embed the interface index in the
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* address. The routine determines our precedence
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* between advanced API scope/interface specification and basic API
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* specification.
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*
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* this function should be nuked in the future, when we get rid of
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* embedded scopeid thing.
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*
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* XXX actually, it is over-specification to return ifp against sin6_scope_id.
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* there can be multiple interfaces that belong to a particular scope zone
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* (in specification, we have 1:N mapping between a scope zone and interfaces).
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* we may want to change the function to return something other than ifp.
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*/
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int
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in6_embedscope(in6, sin6, in6p, ifpp)
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struct in6_addr *in6;
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const struct sockaddr_in6 *sin6;
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struct in6pcb *in6p;
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struct ifnet **ifpp;
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{
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struct ifnet *ifp = NULL;
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u_int32_t scopeid;
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*in6 = sin6->sin6_addr;
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scopeid = sin6->sin6_scope_id;
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if (ifpp)
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*ifpp = NULL;
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/*
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* don't try to read sin6->sin6_addr beyond here, since the caller may
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* ask us to overwrite existing sockaddr_in6
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*/
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#ifdef ENABLE_DEFAULT_SCOPE
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if (scopeid == 0)
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scopeid = scope6_addr2default(in6);
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#endif
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if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
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struct in6_pktinfo *pi;
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/*
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* KAME assumption: link id == interface id
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*/
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if (in6p && in6p->in6p_outputopts &&
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(pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
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pi->ipi6_ifindex) {
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ifp = ifindex2ifnet[pi->ipi6_ifindex];
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in6->s6_addr16[1] = htons(pi->ipi6_ifindex);
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} else if (in6p && IN6_IS_ADDR_MULTICAST(in6) &&
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in6p->in6p_moptions &&
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in6p->in6p_moptions->im6o_multicast_ifp) {
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ifp = in6p->in6p_moptions->im6o_multicast_ifp;
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in6->s6_addr16[1] = htons(ifp->if_index);
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} else if (scopeid) {
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/* boundary check */
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if (scopeid < 0 || if_index < scopeid)
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return ENXIO; /* XXX EINVAL? */
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ifp = ifindex2ifnet[scopeid];
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/* XXX assignment to 16bit from 32bit variable */
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in6->s6_addr16[1] = htons(scopeid & 0xffff);
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}
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if (ifpp)
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*ifpp = ifp;
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}
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return 0;
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}
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/*
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* generate standard sockaddr_in6 from embedded form.
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* touches sin6_addr and sin6_scope_id only.
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*
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* this function should be nuked in the future, when we get rid of
|
|
* embedded scopeid thing.
|
|
*/
|
|
int
|
|
in6_recoverscope(sin6, in6, ifp)
|
|
struct sockaddr_in6 *sin6;
|
|
const struct in6_addr *in6;
|
|
struct ifnet *ifp;
|
|
{
|
|
u_int32_t scopeid;
|
|
|
|
sin6->sin6_addr = *in6;
|
|
|
|
/*
|
|
* don't try to read *in6 beyond here, since the caller may
|
|
* ask us to overwrite existing sockaddr_in6
|
|
*/
|
|
|
|
sin6->sin6_scope_id = 0;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
|
|
/*
|
|
* KAME assumption: link id == interface id
|
|
*/
|
|
scopeid = ntohs(sin6->sin6_addr.s6_addr16[1]);
|
|
if (scopeid) {
|
|
/* sanity check */
|
|
if (scopeid < 0 || if_index < scopeid)
|
|
return ENXIO;
|
|
if (ifp && ifp->if_index != scopeid)
|
|
return ENXIO;
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = scopeid;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* just clear the embedded scope identifer.
|
|
*/
|
|
void
|
|
in6_clearscope(addr)
|
|
struct in6_addr *addr;
|
|
{
|
|
if (IN6_IS_SCOPE_LINKLOCAL(addr))
|
|
addr->s6_addr16[1] = 0;
|
|
}
|