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| author | Mahesh Bandewar <maheshb@google.com> | 2019-07-01 14:38:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-07-01 19:34:46 -0700 |
| commit | 4de83b88c66a1e4dba426b29766fb68e61d93792 (patch) | |
| tree | f75dc32c4268c3622da3173a812eb542490e0536 /include/linux | |
| parent | 8909783cb5b719e05c17e62529efb97c564b2e26 (diff) | |
| download | linux-stable-4de83b88c66a1e4dba426b29766fb68e61d93792.tar.gz linux-stable-4de83b88c66a1e4dba426b29766fb68e61d93792.tar.bz2 linux-stable-4de83b88c66a1e4dba426b29766fb68e61d93792.zip | |
loopback: create blackhole net device similar to loopack.
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/netdevice.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index eeacebd7debb..88292953aa6f 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -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 */ |