Commit bace4b46 authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Jakub Kicinski
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af_unix: Set drop reason in unix_stream_read_skb(). 



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: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250116053441.5758-7-kuniyu@amazon.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 533643b0

net/unix/af_unix.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

		}

	}