This is a note to let you know that I've just added the patch titled
ipv4: fix source address selection with route leak
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv4-fix-source-address-selection-with-route-leak.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dfd009372d960dc1ccf694e7369d58e63cd133c4
Author: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Date: Wed Jul 10 10:14:27 2024 +0200
ipv4: fix source address selection with route leak
[ Upstream commit 6807352353561187a718e87204458999dbcbba1b ]
By default, an address assigned to the output interface is selected when
the source address is not specified. This is problematic when a route,
configured in a vrf, uses an interface from another vrf (aka route leak).
The original vrf does not own the selected source address.
Let's add a check against the output interface and call the appropriate
function to select the source address.
CC: stable@xxxxxxxxxxxxxxx
Fixes: 8cbb512c923d ("net: Add source address lookup op for VRF")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Link: https://patch.msgid.link/20240710081521.3809742-2-nicolas.dichtel@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 3d00253afbb8d..4f1236458c214 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -2286,6 +2286,15 @@ void fib_select_path(struct net *net, struct fib_result *res,
fib_select_default(fl4, res);
check_saddr:
- if (!fl4->saddr)
- fl4->saddr = fib_result_prefsrc(net, res);
+ if (!fl4->saddr) {
+ struct net_device *l3mdev;
+
+ l3mdev = dev_get_by_index_rcu(net, fl4->flowi4_l3mdev);
+
+ if (!l3mdev ||
+ l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) == l3mdev)
+ fl4->saddr = fib_result_prefsrc(net, res);
+ else
+ fl4->saddr = inet_select_addr(l3mdev, 0, RT_SCOPE_LINK);
+ }
}
