ie.,
$ ifconfig eth0 9.9.9.9 netmask 255.255.255.0
$ ping -I lo 9.9.9.9
ping: Warning: source address might be selected on device other than lo.
PING 9.9.9.9 (9.9.9.9) from 9.9.9.9 lo: 56(84) bytes of data.
4 packets transmitted, 0 received, 100% packet loss, time 3068ms
This is because the return value of __raw_v4_lookup in raw_v4_input
is null, the packets cannot be sent to the ping application.
The reason of the __raw_v4_lookup failure is that sk_bound_dev_if and
dif/sdif are not equal in raw_sk_bound_dev_eq.
Here I add a check of whether the sk_bound_dev_if is LOOPBACK_IFINDEX
to solve this problem.
Fixes: 19e4e768064a8 ("ipv4: Fix raw socket lookup for local traffic")
Signed-off-by: guodeqing <geffrey....@huawei.com>
---
include/net/inet_sock.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index a3702d1..7707b1d 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -144,7 +144,7 @@ static inline bool inet_bound_dev_eq(bool l3mdev_accept,
int bound_dev_if,
{
if (!bound_dev_if)
return !sdif || l3mdev_accept;
- return bound_dev_if == dif || bound_dev_if == sdif;
+ return bound_dev_if == dif || bound_dev_if == sdif || bound_dev_if ==
LOOPBACK_IFINDEX;
}
struct inet_cork {
--
2.7.4
