389 lines
12 KiB
C
389 lines
12 KiB
C
|
/* $NetBSD: in6_src.c,v 1.1 2000/06/03 14:36:36 itojun Exp $ */
|
||
|
|
/* $KAME: in6_src.c,v 1.15 2000/05/30 10:16:24 jinmei 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
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "opt_inet.h"
|
||
|
|
|
||
|
|
#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 <netinet/ip6.h>
|
||
|
|
#include <netinet6/in6_pcb.h>
|
||
|
|
#include <netinet6/ip6_var.h>
|
||
|
|
#include <netinet6/nd6.h>
|
||
|
|
|
||
|
|
#include <net/net_osdep.h>
|
||
|
|
|
||
|
|
#include "loop.h"
|
||
|
|
extern struct ifnet loif[NLOOP];
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
|
||
|
|
if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
|
||
|
|
ifp = &loif[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
ro->ro_dst.sin6_scope_id = dstsock->sin6_scope_id;
|
||
|
|
if (IN6_IS_ADDR_MULTICAST(dst)) {
|
||
|
|
ro->ro_rt = rtalloc1(&((struct route *)ro)
|
||
|
|
->ro_dst, 0);
|
||
|
|
} else {
|
||
|
|
rtalloc((struct route *)ro);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 value 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(in6p, ifp)
|
||
|
|
struct in6pcb *in6p;
|
||
|
|
struct ifnet *ifp;
|
||
|
|
{
|
||
|
|
if (in6p && in6p->in6p_hops >= 0)
|
||
|
|
return(in6p->in6p_hops);
|
||
|
|
else if (ifp)
|
||
|
|
return(nd_ifinfo[ifp->if_index].chlim);
|
||
|
|
else
|
||
|
|
return(ip6_defhlim);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Find an empty port and set it to the specified PCB.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
in6_pcbsetport(laddr, in6p)
|
||
|
|
struct in6_addr *laddr;
|
||
|
|
struct in6pcb *in6p;
|
||
|
|
{
|
||
|
|
struct socket *so = in6p->in6p_socket;
|
||
|
|
struct in6pcb *head = in6p->in6p_head;
|
||
|
|
u_int16_t last_port, lport = 0;
|
||
|
|
int wild = 0;
|
||
|
|
void *t;
|
||
|
|
u_int16_t min, max;
|
||
|
|
struct proc *p = curproc; /* XXX */
|
||
|
|
|
||
|
|
/* XXX: this is redundant when called from in6_pcbbind */
|
||
|
|
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
|
||
|
|
((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
|
||
|
|
(so->so_options & SO_ACCEPTCONN) == 0))
|
||
|
|
wild = IN6PLOOKUP_WILDCARD;
|
||
|
|
|
||
|
|
if (in6p->in6p_flags & IN6P_LOWPORT) {
|
||
|
|
if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
|
||
|
|
return (EACCES);
|
||
|
|
min = IPV6PORT_RESERVEDMIN;
|
||
|
|
max = IPV6PORT_RESERVEDMAX;
|
||
|
|
} else {
|
||
|
|
min = IPV6PORT_ANONMIN;
|
||
|
|
max = IPV6PORT_ANONMAX;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* value out of range */
|
||
|
|
if (head->in6p_lport < min)
|
||
|
|
head->in6p_lport = min;
|
||
|
|
else if (head->in6p_lport > max)
|
||
|
|
head->in6p_lport = min;
|
||
|
|
last_port = head->in6p_lport;
|
||
|
|
goto startover; /*to randomize*/
|
||
|
|
for (;;) {
|
||
|
|
lport = htons(head->in6p_lport);
|
||
|
|
if (IN6_IS_ADDR_V4MAPPED(laddr)) {
|
||
|
|
#if 0
|
||
|
|
t = in_pcblookup_bind(&tcbtable,
|
||
|
|
(struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
|
||
|
|
lport);
|
||
|
|
#else
|
||
|
|
t = NULL;
|
||
|
|
#endif
|
||
|
|
} else {
|
||
|
|
t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
|
||
|
|
lport, wild);
|
||
|
|
}
|
||
|
|
if (t == 0)
|
||
|
|
break;
|
||
|
|
startover:
|
||
|
|
if (head->in6p_lport >= max)
|
||
|
|
head->in6p_lport = min;
|
||
|
|
else
|
||
|
|
head->in6p_lport++;
|
||
|
|
if (head->in6p_lport == last_port)
|
||
|
|
return (EADDRINUSE);
|
||
|
|
}
|
||
|
|
|
||
|
|
in6p->in6p_lport = lport;
|
||
|
|
return(0); /* success */
|
||
|
|
}
|