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authorBrian Haley <brian.haley@hp.com>2006-07-10 15:25:51 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-07-12 13:58:37 -0700
commite55ffac6011731c455856072cb23aa20bd55c367 (patch)
tree0ee05b521586b74398023ee083c5f9efbc8bf271 /net/ipv6/addrconf.c
parent155dbfd8846bf165bb036c4492ad121c8b059f1d (diff)
downloadlwn-e55ffac6011731c455856072cb23aa20bd55c367.tar.gz
lwn-e55ffac6011731c455856072cb23aa20bd55c367.zip
[IPV6]: order addresses by scope
If IPv6 addresses are ordered by scope, then ipv6_dev_get_saddr() can break-out of the device addr_list for() loop when the candidate source address scope is less than the destination address scope. Signed-off-by: Brian Haley <brian.haley@hp.com> Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/addrconf.c')
-rw-r--r--net/ipv6/addrconf.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c250d0af10d7..9d9a3c6056fa 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -508,6 +508,25 @@ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
kfree(ifp);
}
+static void
+ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
+{
+ struct inet6_ifaddr *ifa, **ifap;
+
+ /*
+ * Each device address list is sorted in order of scope -
+ * global before linklocal.
+ */
+ for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->if_next) {
+ if (ifp->scope > ifa->scope)
+ break;
+ }
+
+ ifp->if_next = *ifap;
+ *ifap = ifp;
+}
+
/* On success it returns ifp with increased reference count */
static struct inet6_ifaddr *
@@ -573,8 +592,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
write_lock(&idev->lock);
/* Add to inet6_dev unicast addr list. */
- ifa->if_next = idev->addr_list;
- idev->addr_list = ifa;
+ ipv6_link_dev_addr(idev, ifa);
#ifdef CONFIG_IPV6_PRIVACY
if (ifa->flags&IFA_F_TEMPORARY) {
@@ -987,7 +1005,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
continue;
} else if (score.scope < hiscore.scope) {
if (score.scope < daddr_scope)
- continue;
+ break; /* addresses sorted by scope */
else {
score.rule = 2;
goto record_it;