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-rw-r--r--net/sctp/ipv6.c44
1 files changed, 43 insertions, 1 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 321f175055bf..3a571d6614f9 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -80,6 +80,9 @@
#include <asm/uaccess.h>
+static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
+ union sctp_addr *s2);
+
/* Event handler for inet6 address addition/deletion events.
* The sctp_local_addr_list needs to be protocted by a spin lock since
* multiple notifiers (say IPv4 and IPv6) may be running at the same
@@ -244,8 +247,14 @@ static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
union sctp_addr *daddr,
union sctp_addr *saddr)
{
- struct dst_entry *dst;
+ struct dst_entry *dst = NULL;
struct flowi6 fl6;
+ struct sctp_bind_addr *bp;
+ struct sctp_sockaddr_entry *laddr;
+ union sctp_addr *baddr = NULL;
+ __u8 matchlen = 0;
+ __u8 bmatchlen;
+ sctp_scope_t scope;
memset(&fl6, 0, sizeof(fl6));
ipv6_addr_copy(&fl6.daddr, &daddr->v6.sin6_addr);
@@ -261,6 +270,39 @@ static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
}
dst = ip6_route_output(&init_net, NULL, &fl6);
+ if (!asoc || saddr)
+ goto out;
+
+ if (dst->error) {
+ dst_release(dst);
+ dst = NULL;
+ bp = &asoc->base.bind_addr;
+ scope = sctp_scope(daddr);
+ /* Walk through the bind address list and try to get a dst that
+ * matches a bind address as the source address.
+ */
+ rcu_read_lock();
+ list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+ if (!laddr->valid)
+ continue;
+ if ((laddr->state == SCTP_ADDR_SRC) &&
+ (laddr->a.sa.sa_family == AF_INET6) &&
+ (scope <= sctp_scope(&laddr->a))) {
+ bmatchlen = sctp_v6_addr_match_len(daddr,
+ &laddr->a);
+ if (!baddr || (matchlen < bmatchlen)) {
+ baddr = &laddr->a;
+ matchlen = bmatchlen;
+ }
+ }
+ }
+ rcu_read_unlock();
+ if (baddr) {
+ ipv6_addr_copy(&fl6.saddr, &baddr->v6.sin6_addr);
+ dst = ip6_route_output(&init_net, NULL, &fl6);
+ }
+ }
+out:
if (!dst->error) {
struct rt6_info *rt;
rt = (struct rt6_info *)dst;