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af_unix: Set drop reason in unix_stream_read_skb().

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unix_stream_read_skb() is called when BPF SOCKMAP reads some data
from a socket in the map.

SOCKMAP does not support MSG_OOB, and reading OOB results in a drop.

Let's set drop reasons respectively.

  * SOCKET_CLOSE  : the socket in SOCKMAP was close()d
  * UNIX_SKIP_OOB : OOB was read from the socket in SOCKMAP

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250116053441.5758-7-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2025-01-16 14:34:39 +09:00 • committed by Jakub Kicinski
parent 533643b091
commit bace4b4680
1 changed files with 2 additions and 2 deletions
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4
net/unix/af_unix.c
View file

@ -2724,7 +2724,7 @@ static int unix_stream_read_skb(struct sock *sk, skb_read_actor_t recv_actor)
if (sock_flag(sk, SOCK_DEAD)) {
unix_state_unlock(sk);
kfree_skb(skb);
kfree_skb_reason(skb, SKB_DROP_REASON_SOCKET_CLOSE);
return -ECONNRESET;
}
@ -2738,7 +2738,7 @@ static int unix_stream_read_skb(struct sock *sk, skb_read_actor_t recv_actor)
unix_state_unlock(sk);
if (drop) {
kfree_skb(skb);
kfree_skb_reason(skb, SKB_DROP_REASON_UNIX_SKIP_OOB);
return -EAGAIN;
}
}