lkml.org 
[lkml]   [2011]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[43/90] icmp: Fix regression in nexthop resolution during replies.
3.0-stable review patch.  If anyone has any objections, please let us know.

------------------


From: "David S. Miller" <davem@davemloft.net>

[ Upstream commit 415b3334a21aa67806c52d1acf4e72e14f7f402f ]

icmp_route_lookup() uses the wrong flow parameters if the reverse
session route lookup isn't used.

So do not commit to the re-decoded flow until we actually make a
final decision to use a real route saved in 'rt2'.

Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
net/ipv4/icmp.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -380,6 +380,7 @@ static struct rtable *icmp_route_lookup(
struct icmp_bxm *param)
{
struct rtable *rt, *rt2;
+ struct flowi4 fl4_dec;
int err;

memset(fl4, 0, sizeof(*fl4));
@@ -408,19 +409,19 @@ static struct rtable *icmp_route_lookup(
} else
return rt;

- err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(fl4), AF_INET);
+ err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(&fl4_dec), AF_INET);
if (err)
goto relookup_failed;

- if (inet_addr_type(net, fl4->saddr) == RTN_LOCAL) {
- rt2 = __ip_route_output_key(net, fl4);
+ if (inet_addr_type(net, fl4_dec.saddr) == RTN_LOCAL) {
+ rt2 = __ip_route_output_key(net, &fl4_dec);
if (IS_ERR(rt2))
err = PTR_ERR(rt2);
} else {
struct flowi4 fl4_2 = {};
unsigned long orefdst;

- fl4_2.daddr = fl4->saddr;
+ fl4_2.daddr = fl4_dec.saddr;
rt2 = ip_route_output_key(net, &fl4_2);
if (IS_ERR(rt2)) {
err = PTR_ERR(rt2);
@@ -428,7 +429,7 @@ static struct rtable *icmp_route_lookup(
}
/* Ugh! */
orefdst = skb_in->_skb_refdst; /* save old refdst */
- err = ip_route_input(skb_in, fl4->daddr, fl4->saddr,
+ err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
RT_TOS(tos), rt2->dst.dev);

dst_release(&rt2->dst);
@@ -440,10 +441,11 @@ static struct rtable *icmp_route_lookup(
goto relookup_failed;

rt2 = (struct rtable *) xfrm_lookup(net, &rt2->dst,
- flowi4_to_flowi(fl4), NULL,
+ flowi4_to_flowi(&fl4_dec), NULL,
XFRM_LOOKUP_ICMP);
if (!IS_ERR(rt2)) {
dst_release(&rt->dst);
+ memcpy(fl4, &fl4_dec, sizeof(*fl4));
rt = rt2;
} else if (PTR_ERR(rt2) == -EPERM) {
if (rt)



\
 
 \ /
  Last update: 2011-08-14 18:27    [W:0.341 / U:0.352 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site