瀏覽代碼

[IPv6]: Update setsockopt(IPV6_MULTICAST_IF) to support RFC 3493, try2

 From RFC 3493, Section 5.2:

       IPV6_MULTICAST_IF

          Set the interface to use for outgoing multicast packets.  The
          argument is the index of the interface to use.  If the
          interface index is specified as zero, the system selects the
          interface (for example, by looking up the address in a routing
          table and using the resulting interface).

This patch adds support for (index == 0) to reset the value to it's 
original state, allowing the system to choose the best interface.  IPv4 
already behaves this way.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Brian Haley 17 年之前
父節點
當前提交
4953f0fcc0
共有 1 個文件被更改,包括 8 次插入5 次删除
  1. 8 5
      net/ipv6/ipv6_sockglue.c

+ 8 - 5
net/ipv6/ipv6_sockglue.c

@@ -539,12 +539,15 @@ done:
 	case IPV6_MULTICAST_IF:
 		if (sk->sk_type == SOCK_STREAM)
 			goto e_inval;
-		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
-			goto e_inval;
 
-		if (__dev_get_by_index(&init_net, val) == NULL) {
-			retv = -ENODEV;
-			break;
+		if (val) {
+			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
+				goto e_inval;
+
+			if (__dev_get_by_index(&init_net, val) == NULL) {
+				retv = -ENODEV;
+				break;
+			}
 		}
 		np->mcast_oif = val;
 		retv = 0;