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freebsd/sys/netinet6/in6_src.c
Hajimu UMEMOTO 7efe5d92ab - fix typo in comments. 
- style.
- NULL is not 0.
- some variables were renamed.
- nuke unused logic.
(there is no functional change.)

Obtained from:	KAME
2003-10-08 18:26:08 +00:00

541 lines
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/* $FreeBSD$ */
/* $KAME: in6_src.c,v 1.37 2001/03/29 05:34:31 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
*/
#include "opt_inet.h"
#include "opt_inet6.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/errno.h>
#include <sys/time.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>
#ifdef ENABLE_DEFAULT_SCOPE
#include <netinet6/scope6_var.h>
#endif
#include <net/net_osdep.h>
/*
* Return an IPv6 address, which is the most appropriate for a given
* destination and user specified options.
* If necessary, this function lookups the routing table and returns
* 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(ifnet_byindex(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(ifnet_byindex(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 &&
(!(ro->ro_rt->rt_flags & RTF_UP) ||
satosin6(&ro->ro_dst)->sin6_family != AF_INET6 ||
!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) {
struct sockaddr_in6 *sa6;
/* No route yet, so try to acquire one */
bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
sa6->sin6_family = AF_INET6;
sa6->sin6_len = sizeof(struct sockaddr_in6);
sa6->sin6_addr = *dst;
sa6->sin6_scope_id = dstsock->sin6_scope_id;
if (IN6_IS_ADDR_MULTICAST(dst)) {
ro->ro_rt = rtalloc1(&((struct route *)ro)
->ro_dst, 0, 0UL);
RT_UNLOCK(ro->ro_rt);
} 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 (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);
}
/*
* XXX: this is borrowed from in6_pcbbind(). If possible, we should
* share this function by all *bsd*...
*/
int
in6_pcbsetport(laddr, inp, td)
struct in6_addr *laddr;
struct inpcb *inp;
struct thread *td;
{
struct socket *so = inp->inp_socket;
u_int16_t lport = 0, first, last, *lastport;
int count, error = 0, wild = 0;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
/* XXX: this is redundant when called from in6_pcbbind */
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
wild = INPLOOKUP_WILDCARD;
inp->inp_flags |= INP_ANONPORT;
if (inp->inp_flags & INP_HIGHPORT) {
first = ipport_hifirstauto; /* sysctl */
last = ipport_hilastauto;
lastport = &pcbinfo->lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
if (td && (error = suser(td)))
return error;
first = ipport_lowfirstauto; /* 1023 */
last = ipport_lowlastauto; /* 600 */
lastport = &pcbinfo->lastlow;
} else {
first = ipport_firstauto; /* sysctl */
last = ipport_lastauto;
lastport = &pcbinfo->lastport;
}
/*
* Simple check to ensure all ports are not used up causing
* a deadlock here.
*
* We split the two cases (up and down) so that the direction
* is not being tested on each round of the loop.
*/
if (first > last) {
/*
* counting down
*/
count = first - last;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->in6p_laddr = in6addr_any;
return (EAGAIN);
}
--*lastport;
if (*lastport > first || *lastport < last)
*lastport = first;
lport = htons(*lastport);
} while (in6_pcblookup_local(pcbinfo,
&inp->in6p_laddr, lport, wild));
} else {
/*
* counting up
*/
count = last - first;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->in6p_laddr = in6addr_any;
return (EAGAIN);
}
++*lastport;
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
} while (in6_pcblookup_local(pcbinfo,
&inp->in6p_laddr, lport, wild));
}
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->in6p_laddr = in6addr_any;
inp->inp_lport = 0;
return (EAGAIN);
}
return (0);
}
/*
* Generate kernel-internal form (scopeid embedded into s6_addr16[1]).
* If the address scope of is link-local, embed the interface index in the
* address. The routine determines our precedence
* between advanced API scope/interface specification and basic API
* specification.
*
* This function should be nuked in the future, when we get rid of embedded
* scopeid thing.
*
* XXX actually, it is over-specification to return ifp against sin6_scope_id.
* there can be multiple interfaces that belong to a particular scope zone
* (in specification, we have 1:N mapping between a scope zone and interfaces).
* we may want to change the function to return something other than ifp.
*/
int
in6_embedscope(in6, sin6, in6p, ifpp)
struct in6_addr *in6;
const struct sockaddr_in6 *sin6;
#ifdef HAVE_NRL_INPCB
struct inpcb *in6p;
#define in6p_outputopts inp_outputopts6
#define in6p_moptions inp_moptions6
#else
struct in6pcb *in6p;
#endif
struct ifnet **ifpp;
{
struct ifnet *ifp = NULL;
u_int32_t scopeid;
*in6 = sin6->sin6_addr;
scopeid = sin6->sin6_scope_id;
if (ifpp)
*ifpp = NULL;
/*
* don't try to read sin6->sin6_addr beyond here, since the caller may
* ask us to overwrite existing sockaddr_in6
*/
#ifdef ENABLE_DEFAULT_SCOPE
if (scopeid == 0)
scopeid = scope6_addr2default(in6);
#endif
if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
struct in6_pktinfo *pi;
/*
* KAME assumption: link id == interface id
*/
if (in6p && in6p->in6p_outputopts &&
(pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
pi->ipi6_ifindex) {
ifp = ifnet_byindex(pi->ipi6_ifindex);
in6->s6_addr16[1] = htons(pi->ipi6_ifindex);
} else if (in6p && IN6_IS_ADDR_MULTICAST(in6) &&
in6p->in6p_moptions &&
in6p->in6p_moptions->im6o_multicast_ifp) {
ifp = in6p->in6p_moptions->im6o_multicast_ifp;
in6->s6_addr16[1] = htons(ifp->if_index);
} else if (scopeid) {
/* boundary check */
if (scopeid < 0 || if_index < scopeid)
return ENXIO; /* XXX EINVAL? */
ifp = ifnet_byindex(scopeid);
/* XXX assignment to 16bit from 32bit variable */
in6->s6_addr16[1] = htons(scopeid & 0xffff);
}
if (ifpp)
*ifpp = ifp;
}
return 0;
}
#ifdef HAVE_NRL_INPCB
#undef in6p_outputopts
#undef in6p_moptions
#endif
/*
* generate standard sockaddr_in6 from embedded form.
* touches sin6_addr and sin6_scope_id only.
*
* 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 identifier.
* XXX: currently used for bsdi4 only as a supplement function.
*/
void
in6_clearscope(addr)
struct in6_addr *addr;
{
if (IN6_IS_SCOPE_LINKLOCAL(addr))
addr->s6_addr16[1] = 0;
}
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