Files
linux/include/net
Kuniyuki Iwashima 533643b091 af_unix: Set drop reason in manage_oob().
AF_UNIX SOCK_STREAM socket supports MSG_OOB.

When OOB data is sent to a socket, recv() will break at that point.

If the next recv() does not have MSG_OOB, the normal data following
the OOB data is returned.

Then, the OOB skb is dropped.

Let's define a new drop reason for that case in manage_oob().

  # echo 1 > /sys/kernel/tracing/events/skb/kfree_skb/enable

  # python3
  >>> from socket import *
  >>> s1, s2 = socketpair(AF_UNIX)
  >>> s1.send(b'a', MSG_OOB)
  >>> s1.send(b'b')
  >>> s2.recv(2)
  b'b'

  # cat /sys/kernel/tracing/trace_pipe
  ...
     python3-223 ... kfree_skb: ... location=unix_stream_read_generic+0x59e/0xc20 reason: UNIX_SKIP_OOB

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250116053441.5758-6-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-01-20 11:27:41 -08:00
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