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net-core: rx_otherhost_dropped to core_stats

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Increment rx_otherhost_dropped counter when packet dropped due to
mismatched dest MAC addr.

An example when this drop can occur is when manually crafting raw
packets that will be consumed by a user space application via a tap
device. For testing purposes local traffic was generated using trafgen
for the client and netcat to start a server

Tested: Created 2 netns, sent 1 packet using trafgen from 1 to the other
with "{eth(daddr=$INCORRECT_MAC...}", verified that iproute2 showed the
counter was incremented. (Also had to modify iproute2 to show the stat,
additional patch for that coming next.)

Signed-off-by: Jeffrey Ji <jeffreyji@google.com>
Reviewed-by: Brian Vazquez <brianvv@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220406172600.1141083-1-jeffreyjilinux@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeffrey Ji
2022-04-06 17:26:00 +00:00
committed by Jakub Kicinski
parent 4d242a190f
commit 794c24e992
5 changed files with 10 additions and 0 deletions
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2
include/linux/netdevice.h
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@@ -203,6 +203,7 @@ struct net_device_core_stats {
local_t rx_dropped;
local_t tx_dropped;
local_t rx_nohandler;
local_t rx_otherhost_dropped;
} __aligned(4 * sizeof(local_t));
#include <linux/cache.h>
@@ -3837,6 +3838,7 @@ static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev) \
DEV_CORE_STATS_INC(rx_dropped)
DEV_CORE_STATS_INC(tx_dropped)
DEV_CORE_STATS_INC(rx_nohandler)
DEV_CORE_STATS_INC(rx_otherhost_dropped)
static __always_inline int ____dev_forward_skb(struct net_device *dev,
struct sk_buff *skb,