diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2021-05-14 13:04:25 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-05-14 15:26:03 -0700 |
| commit | 709c0314239992162cba26a860f04319a15860c4 (patch) | |
| tree | 0a773304deb90df6e99174cff10593912f151830 /net/ipv6 | |
| parent | 7466b60a3c32a8ad8033b06089e5aae5e8260e86 (diff) | |
tcp: add tracepoint for checksum errors
Add a tracepoint for capturing TCP segments with
a bad checksum. This makes it easy to identify
sources of bad frames in the fleet (e.g. machines
with faulty NICs).
It should also help tools like IOvisor's tcpdrop.py
which are used today to get detailed information
about such packets.
We don't have a socket in many cases so we must
open code the address extraction based just on
the skb.
v2: add missing export for ipv6=m
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 5f47c0b6e3de..4435fa342e7a 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1538,6 +1538,7 @@ discard: kfree_skb(skb); return 0; csum_err: + trace_tcp_bad_csum(skb); TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); goto discard; @@ -1754,6 +1755,7 @@ no_tcp_socket: if (tcp_checksum_complete(skb)) { csum_error: + trace_tcp_bad_csum(skb); __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); bad_packet: __TCP_INC_STATS(net, TCP_MIB_INERRS); |