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| author | Jeffrey Ji <jeffreyji@google.com> | 2022-04-06 17:26:00 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-04-07 20:32:49 -0700 |
| commit | 794c24e9921f32ded4422833a990ccf11dc3c00e (patch) | |
| tree | 000df9bb5f87c8d77389e43c1b5171aafa6f6517 /net/ipv4/ip_input.c | |
| parent | 4d242a190f7df8db6f10a68db84f5413af5e3da2 (diff) | |
| download | lwn-794c24e9921f32ded4422833a990ccf11dc3c00e.tar.gz lwn-794c24e9921f32ded4422833a990ccf11dc3c00e.zip | |
net-core: rx_otherhost_dropped to core_stats
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>
Diffstat (limited to 'net/ipv4/ip_input.c')
| -rw-r--r-- | net/ipv4/ip_input.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 95f7bb052784..b1165f717cd1 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -451,6 +451,7 @@ static struct sk_buff *ip_rcv_core(struct sk_buff *skb, struct net *net) * that it receives, do not try to analyse it. */ if (skb->pkt_type == PACKET_OTHERHOST) { + dev_core_stats_rx_otherhost_dropped_inc(skb->dev); drop_reason = SKB_DROP_REASON_OTHERHOST; goto drop; } |