xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

loopback: create blackhole net device similar to loopack.

Browse Source 
Create a blackhole net device that can be used for "dead"
dst entries instead of loopback device. This blackhole device differs
from loopback in few aspects: (a) It's not per-ns. (b)  MTU on this
device is ETH_MIN_MTU (c) The xmit function is essentially kfree_skb().
and (d) since it's not registered it won't have ifindex.

Lower MTU effectively make the device not pass the MTU check during
the route check when a dst associated with the skb is dead.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar
2019-07-01 14:38:49 -07:00
committed by David S. Miller
parent 8909783cb5
commit 4de83b88c6
2 changed files with 69 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/netdevice.h
View File

@@ -4870,4 +4870,6 @@ do { \
#define PTYPE_HASH_SIZE (16)
#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
extern struct net_device *blackhole_netdev;
#endif /* _LINUX_NETDEVICE_H */