1 files changed, 30 insertions, 4 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 2aa294be0c79..eeeaad2e8b5c 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -395,6 +395,28 @@ sticky_done:
                 break;
         }
 
+        case IPV6_PKTINFO:
+        {
+                struct in6_pktinfo pkt;
+
+                if (optlen == 0)
+                        goto e_inval;
+                else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
+                        goto e_inval;
+
+                if (copy_from_user(&pkt, optval, optlen)) {
+                                retv = -EFAULT;
+                                break;
+                }
+                if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
+                        goto e_inval;
+
+                np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
+                ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
+                retv = 0;
+                break;
+        }
+
         case IPV6_2292PKTOPTIONS:
         {
                 struct ipv6_txoptions *opt = NULL;
@@ -916,8 +938,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                 } else {
                         if (np->rxopt.bits.rxinfo) {
                                 struct in6_pktinfo src_info;
-                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
-                                ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
+                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
+                                        np->sticky_pktinfo.ipi6_ifindex;
+                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
+                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
                         }
                         if (np->rxopt.bits.rxhlim) {
@@ -926,8 +950,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                         }
                         if (np->rxopt.bits.rxoinfo) {
                                 struct in6_pktinfo src_info;
-                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
-                                ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
+                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
+                                        np->sticky_pktinfo.ipi6_ifindex;
+                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
+                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
                         }
                         if (np->rxopt.bits.rxohlim) {