ipv6: Queue fragments per interface for multicast/link-local addresses.

We should queue fragments for the same link-local address on different interfaces (e.g. fe80::1%eth0 and fe80::1%eth1) to the different queue, because of nature of addressing architecture.

Similarly, we should queue fragments for multicast on different interface to the different queue. This is okay because application joins group on speicific interface, and multicast traffic is expected only on that interface.

CC Ben Greear <[email protected]>

CC Vlad Yasevich <[email protected]>

CC Eric Dumazet <[email protected]>

Signed-off-by YOSHIFUJI Hideaki <[email protected]>

---
 include/net/ipv6.h    |    1 +
 net/ipv6/reassembly.c |   11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

include/net/ipv6.h +1 -0

index 851d541..1af98aa 100644
@@ -463,6 +463,7 @@ enum ip6_defrag_users {
 struct ip6_create_arg {
 	__be32 id;
 	u32 user;
+	int ifindex;
 	const struct in6_addr *src;
 	const struct in6_addr *dst;
 };

net/ipv6/reassembly.c +7 -1

index bab2c27..83f02f5 100644
@@ -113,6 +113,7 @@ bool ip6_frag_match(struct inet_frag_queue *q, void *a)
 
 	fq = container_of(q, struct frag_queue, q);
 	return	fq->id == arg->id &&
+		(!arg->ifindex || fq->iif == arg->ifindex) &&
 		fq->user == arg->user &&
 		ipv6_addr_equal(&fq->saddr, arg->src) &&
 		ipv6_addr_equal(&fq->daddr, arg->dst);

@@ -182,13 +183,18 @@ static void ip6_frag_expire(unsigned long data)
 }
 
 static __inline__ struct frag_queue *
-fq_find(struct net *net, __be32 id, const struct in6_addr *src, const struct in6_addr *dst)
+fq_find(struct net *net, __be32 id, int ifindex, const struct in6_addr *src, const struct in6_addr *dst)
 {
 	struct inet_frag_queue *q;
 	struct ip6_create_arg arg;
 	unsigned int hash;
+	int addr_type = ipv6_addr_type(dst);
 
 	arg.id = id;
+	if (addr_type & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL))
+		arg.ifindex = ifindex;
+	else
+		arg.ifindex = 0;
 	arg.user = IP6_DEFRAG_LOCAL_DELIVER;
 	arg.src = src;
 	arg.dst = dst;