Patchwork [4/4] netfilter: ipv6: only provide sk_bound_dev_if for link-local addr

login
register
mail settings
Submitter Pablo Neira
Date Nov. 16, 2012, 12:40 p.m.
Message ID <1353069653-3231-5-git-send-email-pablo@netfilter.org>
Download mbox | patch
Permalink /patch/199563/
State Accepted
Delegated to: David Miller
Headers show

Comments

Pablo Neira - Nov. 16, 2012, 12:40 p.m.
From: Florian Westphal <fw@strlen.de>

yoshfuji points out that sk_bound_dev_if should only be provided
for link-local addresses.

IPv6 getpeer/sockname also has this test, i.e. we will now
only set sin6_scope_id if the original(!) destination
was a link-local address.

Reported-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch

diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 02dcafd..e5f6cf7 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -334,9 +334,14 @@  ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
 	memcpy(&sin6.sin6_addr,
 		&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
 					sizeof(sin6.sin6_addr));
-	sin6.sin6_scope_id = sk->sk_bound_dev_if;
 
 	nf_ct_put(ct);
+
+	if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+		sin6.sin6_scope_id = sk->sk_bound_dev_if;
+	else
+		sin6.sin6_scope_id = 0;
+
 	return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
 }