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authorJakub Kicinski <kuba@kernel.org>2021-05-14 22:04:25 +0200
committerDavid S. Miller <davem@davemloft.net>2021-05-15 00:26:03 +0200
commit709c0314239992162cba26a860f04319a15860c4 (patch)
tree0a773304deb90df6e99174cff10593912f151830 /net/ipv4/tcp_input.c
parentMerge branch 'use-xdp-helpers' (diff)
downloadlinux-709c0314239992162cba26a860f04319a15860c4.tar.xz
linux-709c0314239992162cba26a860f04319a15860c4.zip
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/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4cf4dd532d1c..cd52ce0a2a85 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5885,6 +5885,7 @@ step5:
return;
csum_error:
+ trace_tcp_bad_csum(skb);
TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);