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| author | Michal Kubecek <mkubecek@suse.cz> | 2013-05-28 08:26:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-27 10:39:01 -0700 |
| commit | 791169e5924d35532443c9538e3ba0d49ef0de10 (patch) | |
| tree | 3bb187f27a285e1330bc1d6f6d371623a0c1f583 | |
| parent | 92a47b4c37e9d47887407bb892d9595ef05e89f1 (diff) | |
| download | lwn-791169e5924d35532443c9538e3ba0d49ef0de10.tar.gz lwn-791169e5924d35532443c9538e3ba0d49ef0de10.zip | |
ipv4: fix redirect handling for TCP packets
[ Upstream commit f96ef988cc603487c03a6de07807b06cbe641829 ]
Unlike ipv4_redirect() and ipv4_sk_redirect(), ip_do_redirect()
doesn't call __build_flow_key() directly but via
ip_rt_build_flow_key() wrapper. This leads to __build_flow_key()
getting pointer to IPv4 header of the ICMP redirect packet
rather than pointer to the embedded IPv4 header of the packet
initiating the redirect.
As a result, handling of ICMP redirects initiated by TCP packets
is broken. Issue was introduced by
4895c771c ("ipv4: Add FIB nexthop exceptions.")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/route.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 6e2851464f8f..cfede9a9bb99 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -737,10 +737,15 @@ static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buf { struct rtable *rt; struct flowi4 fl4; + const struct iphdr *iph = (const struct iphdr *) skb->data; + int oif = skb->dev->ifindex; + u8 tos = RT_TOS(iph->tos); + u8 prot = iph->protocol; + u32 mark = skb->mark; rt = (struct rtable *) dst; - ip_rt_build_flow_key(&fl4, sk, skb); + __build_flow_key(&fl4, sk, iph, oif, tos, prot, mark, 0); __ip_do_redirect(rt, skb, &fl4, true); } |