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source address selection part of RFC3484.

Browse Source 
TODO: since there is scope issue to be solved, multicast and
link-local address are treated as special for workaround for
now.

Obtained from:	KAME
This commit is contained in:
ume 2003-11-04 20:22:33 +00:00
parent 51a7ecabf1
commit 41930d5085
5 changed files with 572 additions and 113 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/netinet6/in6.h
View File

@ -592,7 +592,7 @@ struct ip6_mtuinfo {
#define IPV6CTL_TEMPVLTIME 34 /* valid lifetime for tmpaddrs */
#define IPV6CTL_AUTO_LINKLOCAL 35 /* automatic link-local addr assign */
#define IPV6CTL_RIP6STATS 36 /* raw_ip6 stats */
#define IPV6CTL_PREFER_TEMPADDR 37 /* prefer temporary addr as src */
#define IPV6CTL_ADDRCTLPOLICY 38 /* get/set address selection policy */
#define IPV6CTL_MAXFRAGS 41 /* max fragments */

5
sys/netinet6/in6_pcb.h
View File

@ -103,11 +103,6 @@ int in6_setpeeraddr __P((struct socket *so, struct sockaddr **nam));
int in6_setsockaddr __P((struct socket *so, struct sockaddr **nam));
int in6_mapped_sockaddr __P((struct socket *so, struct sockaddr **nam));
int in6_mapped_peeraddr __P((struct socket *so, struct sockaddr **nam));
struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *,
struct ip6_pktopts *,
struct ip6_moptions *,
struct route_in6 *,
struct in6_addr *, int *));
int in6_selecthlim __P((struct in6pcb *, struct ifnet *));
int in6_pcbsetport __P((struct in6_addr *, struct inpcb *, struct thread *));
void init_sin6 __P((struct sockaddr_in6 *sin6, struct mbuf *m));

2
sys/netinet6/in6_proto.c
View File

@ -439,6 +439,8 @@ SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
auto_linklocal, CTLFLAG_RW, &ip6_auto_linklocal, 0, "");
SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
&rip6stat, rip6stat, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR,
prefer_tempaddr, CTLFLAG_RW, &ip6_prefer_tempaddr, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS,
maxfrags, CTLFLAG_RW, &ip6_maxfrags, 0, "");

665
sys/netinet6/in6_src.c
View File

@ -1,5 +1,5 @@
/* $FreeBSD$ */
/* $KAME: in6_src.c,v 1.37 2001/03/29 05:34:31 itojun Exp $ */
/* $KAME: in6_src.c,v 1.132 2003/08/26 04:42:27 keiichi Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -109,12 +109,22 @@ static struct mtx addrsel_lock;
#define ADDR_LABEL_NOTAPP (-1)
struct in6_addrpolicy defaultaddrpolicy;
int ip6_prefer_tempaddr = 0;
static int in6_selectif __P((struct sockaddr_in6 *, struct ip6_pktopts *,
struct ip6_moptions *,
struct route_in6 *ro,
struct ifnet **));
static struct in6_addrpolicy *lookup_addrsel_policy __P((struct sockaddr_in6 *));
static void init_policy_queue __P((void));
static int add_addrsel_policyent __P((struct in6_addrpolicy *));
static int delete_addrsel_policyent __P((struct in6_addrpolicy *));
static int walk_addrsel_policy __P((int (*)(struct in6_addrpolicy *, void *),
void *));
static int dump_addrsel_policyent __P((struct in6_addrpolicy *, void *));
static struct in6_addrpolicy *match_addrsel_policy __P((struct sockaddr_in6 *));
/*
* Return an IPv6 address, which is the most appropriate for a given
@ -122,6 +132,27 @@ static int dump_addrsel_policyent __P((struct in6_addrpolicy *, void *));
* If necessary, this function lookups the routing table and returns
* an entry to the caller for later use.
*/
#define REPLACE(r) do {\
if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
ip6stat.ip6s_sources_rule[(r)]++; \
/* printf("in6_selectsrc: replace %s with %s by %d\n", ia_best ? ip6_sprintf(&ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(&ia->ia_addr.sin6_addr), (r)); */ \
goto replace; \
} while(0)
#define NEXT(r) do {\
if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
ip6stat.ip6s_sources_rule[(r)]++; \
/* printf("in6_selectsrc: keep %s against %s by %d\n", ia_best ? ip6_sprintf(&ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(&ia->ia_addr.sin6_addr), (r)); */ \
goto next; /* XXX: we can't use 'continue' here */ \
} while(0)
#define BREAK(r) do { \
if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
ip6stat.ip6s_sources_rule[(r)]++; \
goto out; /* XXX: we can't use 'break' here */ \
} while(0)
struct in6_addr *
in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
struct sockaddr_in6 *dstsock;
@ -132,42 +163,70 @@ in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
int *errorp;
{
struct in6_addr *dst;
struct in6_ifaddr *ia6 = 0;
struct ifnet *ifp = NULL;
struct in6_ifaddr *ia = NULL, *ia_best = NULL;
struct in6_pktinfo *pi = NULL;
int dst_scope = -1, best_scope = -1, best_matchlen = -1;
struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
u_int32_t odstzone;
int prefer_tempaddr;
dst = &dstsock->sin6_addr;
*errorp = 0;
/*
* If the source address is explicitly specified by the caller,
* use it.
* check if the requested source address is indeed a unicast address
* assigned to the node, and can be used as the packet's source
* address. If everything is okay, use the address as source.
*/
if (opts && (pi = opts->ip6po_pktinfo) &&
!IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
return (&pi->ipi6_addr);
!IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
struct sockaddr_in6 srcsock;
struct in6_ifaddr *ia6;
/* get the outgoing interface */
if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ifp))
!= 0) {
return (NULL);
}
/*
* determine the appropriate zone id of the source based on
* the zone of the destination and the outgoing interface.
*/
bzero(&srcsock, sizeof(srcsock));
srcsock.sin6_family = AF_INET6;
srcsock.sin6_len = sizeof(srcsock);
srcsock.sin6_addr = pi->ipi6_addr;
if (ifp) {
if (in6_addr2zoneid(ifp, &pi->ipi6_addr,
&srcsock.sin6_scope_id)) {
*errorp = EINVAL; /* XXX */
return (NULL);
}
}
if ((*errorp = in6_embedscope(&srcsock.sin6_addr, &srcsock,
NULL, NULL)) != 0) {
return (NULL);
}
srcsock.sin6_scope_id = 0; /* XXX: ifa_ifwithaddr expects 0 */
ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)(&srcsock));
if (ia6 == NULL ||
(ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) {
*errorp = EADDRNOTAVAIL;
return (NULL);
}
pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
return (&ia6->ia_addr.sin6_addr);
}
/*
* If the source address is not specified but the socket(if any)
* is already bound, use the bound address.
* Otherwise, if the socket has already bound the source, just use it.
*/
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
@ -188,121 +247,453 @@ in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
*errorp = ENXIO; /* XXX: better error? */
return (0);
}
ia6 = in6_ifawithscope(ifnet_byindex(dstsock->sin6_scope_id),
dst);
if (ia6 == 0) {
ia = in6_ifawithscope(ifnet_byindex(dstsock->sin6_scope_id),
dst);
if (ia == 0) {
*errorp = EADDRNOTAVAIL;
return (0);
}
return (&satosin6(&ia6->ia_addr)->sin6_addr);
return (&ia->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 the address is not specified, choose the best one based on
* the outgoing interface and the destination address.
*/
if (IN6_IS_ADDR_MULTICAST(dst)) {
struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
/* get the outgoing interface */
if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ifp)) != 0)
return (NULL);
if (ifp == NULL && IN6_IS_ADDR_MC_INTFACELOCAL(dst)) {
ifp = &loif[0];
#ifdef DIAGNOSTIC
if (ifp == NULL) /* this should not happen */
panic("in6_selectsrc: NULL ifp");
#endif
if (in6_addr2zoneid(ifp, dst, &odstzone)) { /* impossible */
*errorp = EIO; /* XXX */
return (NULL);
}
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
int new_scope = -1, new_matchlen = -1;
struct in6_addrpolicy *new_policy = NULL;
u_int32_t srczone, osrczone, dstzone;
struct ifnet *ifp1 = ia->ia_ifp;
/*
* We'll never take an address that breaks the scope zone
* of the destination. We also skip an address if its zone
* does not contain the outgoing interface.
* XXX: we should probably use sin6_scope_id here.
*/
if (in6_addr2zoneid(ifp1, dst, &dstzone) ||
odstzone != dstzone) {
continue;
}
if (in6_addr2zoneid(ifp, &ia->ia_addr.sin6_addr, &osrczone) ||
in6_addr2zoneid(ifp1, &ia->ia_addr.sin6_addr, &srczone) ||
osrczone != srczone) {
continue;
}
if (ifp) {
ia6 = in6_ifawithscope(ifp, dst);
if (ia6 == 0) {
*errorp = EADDRNOTAVAIL;
return (0);
}
return (&satosin6(&ia6->ia_addr)->sin6_addr);
/* avoid unusable addresses */
if ((ia->ia6_flags &
(IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
continue;
}
if (!ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
continue;
/* Rule 1: Prefer same address */
if (IN6_ARE_ADDR_EQUAL(dst, &ia->ia_addr.sin6_addr)) {
ia_best = ia;
BREAK(1); /* there should be no better candidate */
}
if (ia_best == NULL)
REPLACE(0);
/* Rule 2: Prefer appropriate scope */
if (dst_scope < 0)
dst_scope = in6_addrscope(dst);
new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
REPLACE(2);
NEXT(2);
} else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
NEXT(2);
REPLACE(2);
}
/*
* Rule 3: Avoid deprecated addresses. Note that the case of
* !ip6_use_deprecated is already rejected above.
*/
if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
NEXT(3);
if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
REPLACE(3);
/* Rule 4: Prefer home addresses */
/*
* XXX: This is a TODO. We should probably merge the MIP6
* case above.
*/
/* Rule 5: Prefer outgoing interface */
if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
NEXT(5);
if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
REPLACE(5);
/*
* Rule 6: Prefer matching label
* Note that best_policy should be non-NULL here.
*/
if (dst_policy == NULL)
dst_policy = lookup_addrsel_policy(dstsock);
if (dst_policy->label != ADDR_LABEL_NOTAPP) {
new_policy = lookup_addrsel_policy(&ia->ia_addr);
if (dst_policy->label == best_policy->label &&
dst_policy->label != new_policy->label)
NEXT(6);
if (dst_policy->label != best_policy->label &&
dst_policy->label == new_policy->label)
REPLACE(6);
}
/*
* Rule 7: Prefer public addresses.
* We allow users to reverse the logic by configuring
* a sysctl variable, so that privacy conscious users can
* always prefer temporary addresses.
*/
if (opts == NULL ||
opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
prefer_tempaddr = ip6_prefer_tempaddr;
} else if (opts->ip6po_prefer_tempaddr ==
IP6PO_TEMPADDR_NOTPREFER) {
prefer_tempaddr = 0;
} else
prefer_tempaddr = 1;
if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
if (prefer_tempaddr)
REPLACE(7);
else
NEXT(7);
}
if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
!(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
if (prefer_tempaddr)
NEXT(7);
else
REPLACE(7);
}
/*
* Rule 8: prefer addresses on alive interfaces.
* This is a KAME specific rule.
*/
if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
!(ia->ia_ifp->if_flags & IFF_UP))
NEXT(8);
if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
(ia->ia_ifp->if_flags & IFF_UP))
REPLACE(8);
/*
* Rule 14: Use longest matching prefix.
* Note: in the address selection draft, this rule is
* documented as "Rule 8". However, since it is also
* documented that this rule can be overridden, we assign
* a large number so that it is easy to assign smaller numbers
* to more preferred rules.
*/
new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, dst);
if (best_matchlen < new_matchlen)
REPLACE(14);
if (new_matchlen < best_matchlen)
NEXT(14);
/* Rule 15 is reserved. */
/*
* Last resort: just keep the current candidate.
* Or, do we need more rules?
*/
continue;
replace:
ia_best = ia;
best_scope = (new_scope >= 0 ? new_scope :
in6_addrscope(&ia_best->ia_addr.sin6_addr));
best_policy = (new_policy ? new_policy :
lookup_addrsel_policy(&ia_best->ia_addr));
best_matchlen = (new_matchlen >= 0 ? new_matchlen :
in6_matchlen(&ia_best->ia_addr.sin6_addr,
dst));
next:
continue;
out:
break;
}
if ((ia = ia_best) == NULL) {
*errorp = EADDRNOTAVAIL;
return (NULL);
}
return (&ia->ia_addr.sin6_addr);
}
static int
in6_selectif(dstsock, opts, mopts, ro, retifp)
struct sockaddr_in6 *dstsock;
struct ip6_pktopts *opts;
struct ip6_moptions *mopts;
struct route_in6 *ro;
struct ifnet **retifp;
{
int error, clone;
struct rtentry *rt = NULL;
clone = IN6_IS_ADDR_MULTICAST(&dstsock->sin6_addr) ? 0 : 1;
if ((error = in6_selectroute(dstsock, opts, mopts, ro, retifp,
&rt, clone)) != 0) {
return (error);
}
/*
* If the next hop address for the packet is specified
* by caller, use an address associated with the route
* to the next hop.
* do not use a rejected or black hole route.
* XXX: this check should be done in the L2 output routine.
* However, if we skipped this check here, we'd see the following
* scenario:
* - install a rejected route for a scoped address prefix
* (like fe80::/10)
* - send a packet to a destination that matches the scoped prefix,
* with ambiguity about the scope zone.
* - pick the outgoing interface from the route, and disambiguate the
* scope zone with the interface.
* - ip6_output() would try to get another route with the "new"
* destination, which may be valid.
* - we'd see no error on output.
* Although this may not be very harmful, it should still be confusing.
* We thus reject the case here.
*/
{
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 (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
}
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
* Adjust the "outgoing" interface. If we're going to loop the packet
* back to ourselves, the ifp would be the loopback interface.
* However, we'd rather know the interface associated to the
* destination address (which should probably be one of our own
* addresses.)
*/
if (rt && rt->rt_ifa && rt->rt_ifa->ifa_ifp)
*retifp = rt->rt_ifa->ifa_ifp;
return (0);
}
int
in6_selectroute(dstsock, opts, mopts, ro, retifp, retrt, clone)
struct sockaddr_in6 *dstsock;
struct ip6_pktopts *opts;
struct ip6_moptions *mopts;
struct route_in6 *ro;
struct ifnet **retifp;
struct rtentry **retrt;
int clone; /* meaningful only for bsdi and freebsd. */
{
int error = 0;
struct ifnet *ifp = NULL;
struct rtentry *rt = NULL;
struct sockaddr_in6 *sin6_next;
struct in6_pktinfo *pi = NULL;
struct in6_addr *dst = &dstsock->sin6_addr;
#if 0
if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
dstsock->sin6_addr.s6_addr32[1] == 0 &&
!IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
printf("in6_selectroute: strange destination %s\n",
ip6_sprintf(&dstsock->sin6_addr));
} else {
printf("in6_selectroute: destination = %s%%%d\n",
ip6_sprintf(&dstsock->sin6_addr),
dstsock->sin6_scope_id); /* for debug */
}
#endif
/* If the caller specify the outgoing interface explicitly, use it. */
if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
/* XXX boundary check is assumed to be already done. */
ifp = ifnet_byindex(pi->ipi6_ifindex);
if (ifp != NULL &&
(retrt == NULL || IN6_IS_ADDR_MULTICAST(dst))) {
/*
* we do not have to check nor get the route for
* multicast.
*/
goto done;
} else
goto getroute;
}
/*
* If the destination address is a multicast address and the outgoing
* interface for the address is specified by the caller, use it.
*/
if (IN6_IS_ADDR_MULTICAST(dst) &&
mopts != NULL && (ifp = mopts->im6o_multicast_ifp) != NULL) {
goto done; /* we do not need a route for multicast. */
}
getroute:
/*
* If the next hop address for the packet is specified by the caller,
* use it as the gateway.
*/
if (opts && opts->ip6po_nexthop) {
struct route_in6 *ron;
sin6_next = satosin6(opts->ip6po_nexthop);
/* at this moment, we only support AF_INET6 next hops */
if (sin6_next->sin6_family != AF_INET6) {
error = EAFNOSUPPORT; /* or should we proceed? */
goto done;
}
/*
* If the next hop is an IPv6 address, then the node identified
* by that address must be a neighbor of the sending host.
*/
ron = &opts->ip6po_nextroute;
if ((ron->ro_rt &&
(ron->ro_rt->rt_flags & (RTF_UP | RTF_LLINFO)) !=
(RTF_UP | RTF_LLINFO)) ||
!SA6_ARE_ADDR_EQUAL(satosin6(&ron->ro_dst), sin6_next)) {
if (ron->ro_rt) {
RTFREE(ron->ro_rt);
ron->ro_rt = NULL;
}
*satosin6(&ron->ro_dst) = *sin6_next;
}
if (ron->ro_rt == NULL) {
rtalloc((struct route *)ron); /* multi path case? */
if (ron->ro_rt == NULL ||
!(ron->ro_rt->rt_flags & RTF_LLINFO)) {
if (ron->ro_rt) {
RTFREE(ron->ro_rt);
ron->ro_rt = NULL;
}
error = EHOSTUNREACH;
goto done;
}
}
rt = ron->ro_rt;
ifp = rt->rt_ifp;
/*
* When cloning is required, try to allocate a route to the
* destination so that the caller can store path MTU
* information.
*/
if (!clone)
goto done;
}
/*
* Use a cached route if it exists and is valid, else try to allocate
* a new one. Note that we should check the address family of the
* cached destination, in case of sharing the cache with IPv4.
*/
if (ro) {
if (ro->ro_rt &&
(!(ro->ro_rt->rt_flags & RTF_UP) ||
satosin6(&ro->ro_dst)->sin6_family != AF_INET6 ||
((struct sockaddr *)(&ro->ro_dst))->sa_family != AF_INET6 ||
!IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr,
dst))) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
ro->ro_rt = (struct rtentry *)NULL;
}
if (ro->ro_rt == (struct rtentry *)0 ||
ro->ro_rt->rt_ifp == (struct ifnet *)0) {
if (ro->ro_rt == (struct rtentry *)NULL) {
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)) {
*sa6 = *dstsock;
if (clone) {
rtalloc((struct route *)ro);
} else {
ro->ro_rt = rtalloc1(&((struct route *)ro)
->ro_dst, 0, 0UL);
->ro_dst, NULL, 0UL);
if (ro->ro_rt)
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.
* do not care about the result if we have the nexthop
* explicitly specified.
*/
if (opts && opts->ip6po_nexthop)
goto done;
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);
ifp = ro->ro_rt->rt_ifp;
if (ifp == NULL) { /* can this really happen? */
RTFREE(ro->ro_rt);
ro->ro_rt = NULL;
}
}
if (ia6 == 0) {
*errorp = EHOSTUNREACH; /* no route */
return (0);
if (ro->ro_rt == NULL)
error = EHOSTUNREACH;
rt = ro->ro_rt;
/*
* Check if the outgoing interface conflicts with
* the interface specified by ipi6_ifindex (if specified).
* Note that loopback interface is always okay.
* (this may happen when we are sending a packet to one of
* our own addresses.)
*/
if (opts && opts->ip6po_pktinfo
&& opts->ip6po_pktinfo->ipi6_ifindex) {
if (!(ifp->if_flags & IFF_LOOPBACK) &&
ifp->if_index !=
opts->ip6po_pktinfo->ipi6_ifindex) {
error = EHOSTUNREACH;
goto done;
}
}
return (&satosin6(&ia6->ia_addr)->sin6_addr);
}
*errorp = EADDRNOTAVAIL;
return (0);
done:
if (ifp == NULL && rt == NULL) {
/*
* This can happen if the caller did not pass a cached route
* nor any other hints. We treat this case an error.
*/
error = EHOSTUNREACH;
}
if (error == EHOSTUNREACH)
ip6stat.ip6s_noroute++;
if (retifp != NULL)
*retifp = ifp;
if (retrt != NULL)
*retrt = rt; /* rt may be NULL */
return (error);
}
/*
@ -445,10 +836,9 @@ in6_embedscope(in6, sin6, in6p, ifpp)
struct ifnet **ifpp;
{
struct ifnet *ifp = NULL;
u_int32_t scopeid;
u_int32_t zoneid = sin6->sin6_scope_id;
*in6 = sin6->sin6_addr;
scopeid = sin6->sin6_scope_id;
if (ifpp)
*ifpp = NULL;
@ -458,17 +848,14 @@ in6_embedscope(in6, sin6, in6p, ifpp)
*/
#ifdef ENABLE_DEFAULT_SCOPE
if (scopeid == 0)
scopeid = scope6_addr2default(in6);
if (zoneid == 0)
zoneid = scope6_addr2default(in6);
#endif
if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
struct in6_pktinfo *pi;
/*
* KAME assumption: link id == interface id
*/
/* KAME assumption: link id == interface id */
if (in6p && in6p->in6p_outputopts &&
(pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
pi->ipi6_ifindex) {
@ -479,13 +866,13 @@ in6_embedscope(in6, sin6, in6p, ifpp)
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);
} else if (zoneid) {
if (if_index < zoneid)
return (ENXIO); /* XXX EINVAL? */
ifp = ifnet_byindex(zoneid);
/* XXX assignment to 16bit from 32bit variable */
in6->s6_addr16[1] = htons(scopeid & 0xffff);
in6->s6_addr16[1] = htons(zoneid & 0xffff);
}
if (ifpp)
@ -560,6 +947,24 @@ addrsel_policy_init()
defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
}
static struct in6_addrpolicy *
lookup_addrsel_policy(key)
struct sockaddr_in6 *key;
{
struct in6_addrpolicy *match = NULL;
ADDRSEL_LOCK();
match = match_addrsel_policy(key);
if (match == NULL)
match = &defaultaddrpolicy;
else
match->use++;
ADDRSEL_UNLOCK();
return (match);
}
/*
* Subroutines to manage the address selection policy table via sysctl.
*/
@ -737,3 +1142,49 @@ dump_addrsel_policyent(pol, arg)
return (error);
}
static struct in6_addrpolicy *
match_addrsel_policy(key)
struct sockaddr_in6 *key;
{
struct addrsel_policyent *pent;
struct in6_addrpolicy *bestpol = NULL, *pol;
int matchlen, bestmatchlen = -1;
u_char *mp, *ep, *k, *p, m;
for (pent = TAILQ_FIRST(&addrsel_policytab); pent;
pent = TAILQ_NEXT(pent, ape_entry)) {
matchlen = 0;
pol = &pent->ape_policy;
mp = (u_char *)&pol->addrmask.sin6_addr;
ep = mp + 16; /* XXX: scope field? */
k = (u_char *)&key->sin6_addr;
p = (u_char *)&pol->addr.sin6_addr;
for (; mp < ep && *mp; mp++, k++, p++) {
m = *mp;
if ((*k & m) != *p)
goto next; /* not match */
if (m == 0xff) /* short cut for a typical case */
matchlen += 8;
else {
while (m >= 0x80) {
matchlen++;
m <<= 1;
}
}
}
/* matched. check if this is better than the current best. */
if (bestpol == NULL ||
matchlen > bestmatchlen) {
bestpol = pol;
bestmatchlen = matchlen;
}
next:
continue;
}
return (bestpol);
}

11
sys/netinet6/ip6_var.h
View File

@ -244,6 +244,9 @@ struct ip6stat {
u_quad_t ip6s_forward_cachehit;
u_quad_t ip6s_forward_cachemiss;
/* number of times that each rule of source selection is applied. */
u_quad_t ip6s_sources_rule[16];
};
#ifdef _KERNEL
@ -322,6 +325,8 @@ extern int ip6_lowportmin; /* minimum reserved port */
extern int ip6_lowportmax; /* maximum reserved port */
extern int ip6_use_tempaddr; /* whether to use temporary addresses. */
extern int ip6_prefer_tempaddr; /* whether to prefer temporary addresses
in the source address selection */
#ifdef PFIL_HOOKS
extern struct pfil_head inet6_pfil_hook;
@ -392,6 +397,12 @@ int rip6_usrreq __P((struct socket *,
int dest6_input __P((struct mbuf **, int *, int));
int none_input __P((struct mbuf **, int *, int));
struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *,
struct ip6_pktopts *, struct ip6_moptions *, struct route_in6 *,
struct in6_addr *, int *));
int in6_selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
struct ip6_moptions *, struct route_in6 *, struct ifnet **,
struct rtentry **, int));
#ifdef RANDOM_IP_ID
u_int32_t ip6_randomid __P((void));
u_int32_t ip6_randomflowlabel __P((void));