net: ipv6: more places need LOOPBACK_IFINDEX for flowi6_iif

To properly match iif in ip rules we have to provide
LOOPBACK_IFINDEX in flowi6_iif, not 0. Some ip6mr_fib_lookup
and fib6_rule_lookup callers need such fix.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 4 insertions, 1 deletions

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 8659067da28e..8250474ab7dc 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1633,7 +1633,7 @@ struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
 {
         struct mr6_table *mrt;
         struct flowi6 fl6 = {
-                .flowi6_iif     = skb->skb_iif,
+                .flowi6_iif     = skb->skb_iif ? : LOOPBACK_IFINDEX,
                 .flowi6_oif     = skb->dev->ifindex,
                 .flowi6_mark    = skb->mark,
         };
diff --git a/net/ipv6/netfilter/ip6t_rpfilter.c b/net/ipv6/netfilter/ip6t_rpfilter.c
index e0983f3648a6..790e0c6b19e1 100644
--- a/net/ipv6/netfilter/ip6t_rpfilter.c
+++ b/net/ipv6/netfilter/ip6t_rpfilter.c
@@ -33,6 +33,7 @@ static bool rpfilter_lookup_reverse6(const struct sk_buff *skb,
         struct ipv6hdr *iph = ipv6_hdr(skb);
         bool ret = false;
         struct flowi6 fl6 = {
+                .flowi6_iif = LOOPBACK_IFINDEX,
                 .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
                 .flowi6_proto = iph->nexthdr,
                 .daddr = iph->saddr,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 4011617cca68..004fffb6c221 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1273,6 +1273,7 @@ void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
         struct flowi6 fl6;
 
         memset(&fl6, 0, sizeof(fl6));
+        fl6.flowi6_iif = LOOPBACK_IFINDEX;
         fl6.flowi6_oif = oif;
         fl6.flowi6_mark = mark;
         fl6.daddr = iph->daddr;
@@ -1294,6 +1295,7 @@ void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
         struct flowi6 fl6;
 
         memset(&fl6, 0, sizeof(fl6));
+        fl6.flowi6_iif = LOOPBACK_IFINDEX;
         fl6.flowi6_oif = oif;
         fl6.flowi6_mark = mark;
         fl6.daddr = msg->dest;