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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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net/core/dev.c
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@@ -10358,6 +10358,7 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
storage->rx_dropped += local_read(&core_stats->rx_dropped);
storage->tx_dropped += local_read(&core_stats->tx_dropped);
storage->rx_nohandler += local_read(&core_stats->rx_nohandler);
storage->rx_otherhost_dropped += local_read(&core_stats->rx_otherhost_dropped);
}
}
return storage;