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ipv4: fix source address selection with route leak

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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@vger.kernel.org
Fixes: 8cbb512c92 ("net: Add source address lookup op for VRF")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20240710081521.3809742-2-nicolas.dichtel@6wind.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nicolas Dichtel 2024-07-10 10:14:27 +02:00 committed by Jakub Kicinski
parent f67a90a0c8
commit 6807352353
1 changed files with 11 additions and 2 deletions
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13
net/ipv4/fib_semantics.c
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@ -2270,6 +2270,15 @@ 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);
}
}