/*
* 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
*/
/*
* 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.
*/
#if 0 /* disabled ad-hoc */
#define REPLACE(r) do {\
char _buf1[INET6_ADDRSTRLEN], _buf2[INET6_ADDRSTRLEN]; \
if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
ip6stat.ip6s_sources_rule[(r)]++; \
printf("%s: replace %s with %s by %d\n", __func__, ia_best ? \
IN6_PRINT(_buf1, &ia_best->ia_addr.sin6_addr) : "none", \
IN6_PRINT(_buf2, &ia->ia_addr.sin6_addr), (r)); \
goto replace; \
} while(/*CONSTCOND*/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("%s: keep %s against %s by %d\n", ia_best ? \
IN6_PRINT(_buf1, &ia_best->ia_addr.sin6_addr) : "none", \
IN6_PRINT(_buf2, &ia->ia_addr.sin6_addr), (r)); \
goto next; /* XXX: we can't use 'continue' here */ \
} while(/*CONSTCOND*/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(/*CONSTCOND*/0)
#else
#define REPLACE(r) goto replace
#define NEXT(r) goto next
#define BREAK(r) goto out
#endif
/*
* 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_setscope(dst, ifp1, &dstzone) ||
odstzone != dstzone) {
continue;
}
src = ia->ia_addr.sin6_addr;
/* Skip the scope test in impossible cases */
if (!(ifp->if_flags & IFF_LOOPBACK) &&
IN6_IS_ADDR_LOOPBACK(&src))
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(1);
/* 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.
* Treat unvalidated addresses as deprecated here.
*/
if (IFA6_IS_VALIDATED(ia_best) && !IFA6_IS_VALIDATED(ia))
NEXT(3);
if (!IFA6_IS_VALIDATED(ia_best) && IFA6_IS_VALIDATED(ia))
REPLACE(3);
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 */
#if defined(MIP6) && NMIP > 0
if (!MIP6_IS_MN)
goto skip_rule4;
if ((ia_best->ia6_flags & IN6_IFF_HOME) == 0 &&
(ia->ia6_flags & IN6_IFF_HOME) == 0) {
/* both address are not home addresses. */
goto skip_rule4;
}
/*
* If SA is simultaneously a home address and care-of
* address and SB is not, then prefer SA. Similarly,
* if SB is simultaneously a home address and care-of
* address and SA is not, then prefer SB.
*/
if (((ia_best->ia6_flags & IN6_IFF_HOME) != 0 &&
ia_best->ia_ifp->if_type != IFT_MIP)
&&
((ia->ia6_flags & IN6_IFF_HOME) != 0 &&
ia->ia_ifp->if_type == IFT_MIP))
NEXT(4);
if (((ia_best->ia6_flags & IN6_IFF_HOME) != 0 &&
ia_best->ia_ifp->if_type == IFT_MIP)
&&
((ia->ia6_flags & IN6_IFF_HOME) != 0 &&
ia->ia_ifp->if_type != IFT_MIP))
REPLACE(4);
if (ip6po_usecoa == 0) {
/*
* If SA is just a home address and SB is just
* a care-of address, then prefer
* SA. Similarly, if SB is just a home address
* and SA is just a care-of address, then
* prefer SB.
*/
if ((ia_best->ia6_flags & IN6_IFF_HOME) != 0 &&
(ia->ia6_flags & IN6_IFF_HOME) == 0) {
NEXT(4);
}
if ((ia_best->ia6_flags & IN6_IFF_HOME) == 0 &&
(ia->ia6_flags & IN6_IFF_HOME) != 0) {
REPLACE(4);
}
} else {
/*
* a sender don't want to use a home address
* because:
*
* 1) we cannot use. (ex. NS or NA to global
* addresses.)
*
* 2) a user specified not to use.
* (ex. mip6control -u)
*/
if ((ia_best->ia6_flags & IN6_IFF_HOME) == 0 &&
(ia->ia6_flags & IN6_IFF_HOME) != 0) {
/* XXX breaks stat */
NEXT(0);
}
if ((ia_best->ia6_flags & IN6_IFF_HOME) != 0 &&
(ia->ia6_flags & IN6_IFF_HOME) == 0) {
/* XXX breaks stat */
REPLACE(0);
}
}
skip_rule4:
#endif /* MIP6 && NMIP > 0 */
/*
* 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 9: prefer addresses on "preferred" interfaces.
* This is a KAME specific rule.
*/
#ifdef notyet /* until introducing address selection */
#define NDI_BEST ND_IFINFO(ia_best->ia_ifp)
#define NDI_NEW ND_IFINFO(ia->ia_ifp)
if ((NDI_BEST->flags & ND6_IFF_PREFER_SOURCE) &&
!(NDI_NEW->flags & ND6_IFF_PREFER_SOURCE))
NEXT(9);
if (!(NDI_BEST->flags & ND6_IFF_PREFER_SOURCE) &&
(NDI_NEW->flags & ND6_IFF_PREFER_SOURCE))
REPLACE(9);
#undef NDI_BEST
#undef NDI_NEW
#endif
/*
* 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;
dst = dstsock->sin6_addr; /* make a copy for local operation */
if (ifpp)
*ifpp = NULL;
/*
* Try to determine the outgoing interface for the given destination.
* We do this regardless of whether the socket is bound, since the
* caller may need this information as a side effect of the call
* to this function (e.g., for identifying the appropriate scope zone
* ID).
*/
iferror = in6_selectif(dstsock, opts, mopts, ro, &ifp, PSREF);
if (ifpp != NULL)
*ifpp = ifp;
/*
* If the source address is explicitly specified by the caller,
* 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)) {
struct sockaddr_in6 srcsock;
struct in6_ifaddr *ia6;
int _s;
struct ifaddr *ifa;
/*
* Determine the appropriate zone id of the source based on
* the zone of the destination and the outgoing interface.
* If the specified address is ambiguous wrt the scope zone,
* the interface must be specified; otherwise, ifa_ifwithaddr()
* will fail matching the address.
*/
memset(&srcsock, 0, sizeof(srcsock));
srcsock.sin6_family = AF_INET6;
srcsock.sin6_len = sizeof(srcsock);
srcsock.sin6_addr = pi->ipi6_addr;
if (ifp) {
error = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
if (error != 0)
goto exit;
}
_s = pserialize_read_enter();
ifa = ifa_ifwithaddr(sin6tosa(&srcsock));
if ((ia6 = ifatoia6(ifa)) == NULL ||
ia6->ia6_flags &
(IN6_IFF_ANYCAST | IN6_IFF_NOTREADY)) {
pserialize_read_exit(_s);
error = EADDRNOTAVAIL;
goto exit;
}
pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
if (ifpp)
*ifpp = ifp;
*ret_ia6 = ia6->ia_addr.sin6_addr;
pserialize_read_exit(_s);
goto exit;
}
/*
* If the socket has already bound the source, just use it. We don't
* care at the moment whether in6_selectif() succeeded above, even
* though it would eventually cause an error.
*/
if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
*ret_ia6 = *laddr;
goto exit;
}
/*
* The outgoing interface is crucial in the general selection procedure
* below. If it is not known at this point, we fail.
*/
if (ifp == NULL) {
error = iferror;
goto exit;
}
/*
* If the address is not yet determined, choose the best one based on
* the outgoing interface and the destination address.
*/
#if defined(MIP6) && NMIP > 0
/*
* a caller can specify IP6PO_USECOA to not to use a home
* address. for example, the case that the neighbour
* unreachability detection to the global address.
*/
if (opts != NULL &&
(opts->ip6po_flags & IP6PO_USECOA) != 0) {
ip6po_usecoa = 1;
}
#endif /* MIP6 && NMIP > 0 */
/*
* 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 *ron;
struct sockaddr_in6 *sin6_next;
sin6_next = satosin6(opts->ip6po_nexthop);
/* at this moment, we only support AF_INET6 next hops */
if (sin6_next->sin6_family != AF_INET6) {
IP6_STATINC(IP6_STAT_ODROPPED);
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;
rt = rtcache_lookup(ron, sin6tosa(sin6_next));
if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) != 0 ||
!nd6_is_addr_neighbor(sin6_next, rt->rt_ifp)) {
if (rt != NULL) {
if (count_discard)
in6_ifstat_inc(rt->rt_ifp,
ifs6_out_discard);
rtcache_unref(rt, ron);
rt = NULL;
}
rtcache_free(ron);
error = EHOSTUNREACH;
goto done;
}
*ro = ron;
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.
*
* for V4 mapped addresses we want to pick up the v4 route
* see PR kern/56348
*/
if (IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
in6_sin6_2_sin(&u.dst4, dstsock);
} else {
u.dst6 = *dstsock;
u.dst6.sin6_scope_id = 0;
}
rt = rtcache_lookup1(*ro, &u.dst, 1);
if (rt == NULL)
error = EHOSTUNREACH;
/*
* 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 (rt != NULL && !(rt->rt_ifp->if_flags & IFF_LOOPBACK) &&
rt->rt_ifp->if_index != opts->ip6po_pktinfo->ipi6_ifindex) {
if (count_discard)
in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
error = EHOSTUNREACH;
rtcache_unref(rt, *ro);
rt = NULL;
}
}
/* 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. */
*retifp = if_get_byindex(pi->ipi6_ifindex, psref);
if (*retifp != NULL)
return 0;
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) {
*retifp = if_get_byindex(mopts->im6o_multicast_if_index, psref);
if (*retifp != NULL)
return 0; /* we do not need a route for multicast. */
}
/*
* 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.
*/
if ((rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
error = (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
/* XXX: ifp can be returned with psref even if error */
goto out;
}
/*
* 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_ifa->ifa_ifp != *retifp &&
!if_is_deactivated(rt->rt_ifa->ifa_ifp)) {
if_put(*retifp, psref);
*retifp = rt->rt_ifa->ifa_ifp;
if_acquire(*retifp, psref);
}
out:
rtcache_unref(rt, ro);
return error;
}
/*
* 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
in6pcb_selecthlim(struct inpcb *inp, struct ifnet *ifp)
{
if (inp && in6p_hops6(inp) >= 0)
return in6p_hops6(inp);
else if (ifp)
return (ND_IFINFO(ifp)->chlim);
else
return (ip6_defhlim);
}
int
in6pcb_selecthlim_rt(struct inpcb *inp)
{
struct rtentry *rt;
if (inp == NULL)
return in6pcb_selecthlim(inp, NULL);
rt = rtcache_validate(&inp->inp_route);
if (rt != NULL) {
int ret = in6pcb_selecthlim(inp, rt->rt_ifp);
rtcache_unref(rt, &inp->inp_route);
return ret;
} else
return in6pcb_selecthlim(inp, NULL);
}
/*
* Find an empty port and set it to the specified PCB.
*/
int
in6pcb_set_port(struct sockaddr_in6 *sin6, struct inpcb *inp, struct lwp *l)
{
struct socket *so = inp->inp_socket;
struct inpcbtable *table = inp->inp_table;
u_int16_t lport, *lastport;
enum kauth_network_req req;
int error = 0;
int
in6_src_ioctl(u_long cmd, void *data)
{
int i;
struct in6_addrpolicy ent0;
if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
return (EOPNOTSUPP); /* check for safety */
ent0 = *(struct in6_addrpolicy *)data;
if (ent0.label == ADDR_LABEL_NOTAPP)
return (EINVAL);
/* check if the prefix mask is consecutive. */
if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
return (EINVAL);
/* clear trailing garbages (if any) of the prefix address. */
for (i = 0; i < 4; i++) {
ent0.addr.sin6_addr.s6_addr32[i] &=
ent0.addrmask.sin6_addr.s6_addr32[i];
}
ent0.use = 0;
switch (cmd) {
case SIOCAADDRCTL_POLICY:
return (add_addrsel_policyent(&ent0));
case SIOCDADDRCTL_POLICY:
return (delete_addrsel_policyent(&ent0));
}
return (0); /* XXX: compromise compilers */
}
/*
* The followings are implementation of the policy table using a
* simple tail queue.
* XXX such details should be hidden.
* XXX implementation using binary tree should be more efficient.
*/
struct addrsel_policyent {
TAILQ_ENTRY(addrsel_policyent) ape_entry;
struct in6_addrpolicy ape_policy;
};
static int
delete_addrsel_policyent(struct in6_addrpolicy *key)
{
struct addrsel_policyent *pol;
/* search for the entry in the table */
for (pol = TAILQ_FIRST(&addrsel_policytab); pol;
pol = TAILQ_NEXT(pol, ape_entry)) {
if (IN6_ARE_ADDR_EQUAL(&key->addr.sin6_addr,
&pol->ape_policy.addr.sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&key->addrmask.sin6_addr,
&pol->ape_policy.addrmask.sin6_addr)) {
break;
}
}
if (pol == NULL) {
return (ESRCH);
}
TAILQ_REMOVE(&addrsel_policytab, pol, ape_entry);
return (0);
}
static int
walk_addrsel_policy(int (*callback)(struct in6_addrpolicy *, void *), void *w)
{
struct addrsel_policyent *pol;
int error = 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;
}
