@@ -271,6 +271,7 @@ struct in6_flowlabel_req {
#define IPV6_ORIGDSTADDR 74
#define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
#define IPV6_TRANSPARENT 75
+#define IPV6_UNICAST_IF 76
/*
* Multicast Routing:
@@ -324,6 +324,7 @@ struct ipv6_pinfo {
__unused_2:6;
__s16 mcast_hops:9;
#endif
+ int ucast_oif;
int mcast_oif;
/* pktoption flags */
@@ -468,6 +468,8 @@ void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
dst = icmpv6_route_lookup(net, skb, sk, &fl6);
if (IS_ERR(dst))
@@ -553,6 +555,8 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
err = ip6_dst_lookup(sk, &dst, &fl6);
if (err)
@@ -516,6 +516,36 @@ done:
retv = 0;
break;
+ case IPV6_UNICAST_IF:
+ {
+ struct net_device *dev = NULL;
+ int ifindex;
+
+ if (optlen != sizeof(int))
+ goto e_inval;
+
+ ifindex = (__force int)ntohl((__force __be32)val);
+ if (ifindex == 0) {
+ np->ucast_oif = 0;
+ retv = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(net, ifindex);
+ retv = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+ dev_put(dev);
+
+ retv = -EINVAL;
+ if (sk->sk_bound_dev_if)
+ break;
+
+ np->ucast_oif = ifindex;
+ retv = 0;
+ break;
+ }
+
case IPV6_MULTICAST_IF:
if (sk->sk_type == SOCK_STREAM)
break;
@@ -1160,6 +1190,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->mcast_oif;
break;
+ case IPV6_UNICAST_IF:
+ val = (__force int)htonl((__u32) np->ucast_oif);
+ break;
+
case IPV6_MTU_DISCOVER:
val = np->pmtudisc;
break;
@@ -856,6 +856,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
@@ -1130,7 +1130,8 @@ do_udp_sendmsg:
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
fl6.flowi6_oif = np->mcast_oif;
connected = 0;
- }
+ } else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
The IPV6_UNICAST_IF feature is the IPv6 compliment to IP_UNICAST_IF. Signed-off-by: Erich E. Hoover <ehoover@mines.edu> --- include/linux/in6.h | 1 + include/linux/ipv6.h | 1 + net/ipv6/icmp.c | 4 ++++ net/ipv6/ipv6_sockglue.c | 34 ++++++++++++++++++++++++++++++++++ net/ipv6/raw.c | 2 ++ net/ipv6/udp.c | 3 ++- 6 files changed, 44 insertions(+), 1 deletions(-)