Commit 78aeaaef authored Aug 28, 2017 by John Fastabend Committed by David S. Miller Aug 28, 2017

bpf: sockmap indicate sock events to listeners

After userspace pushes sockets into a sockmap it may not be receiving
data (assuming stream_{parser|verdict} programs are attached). But, it
may still want to manage the socks. A common pattern is to poll/select
for a POLLRDHUP event so we can close the sock.

This patch adds the logic to wake up these listeners.

Also add TCP_SYN_SENT to the list of events to handle. We don't want
to break the connection just because we happen to be in this state.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 81374aaa

kernel/bpf/sockmap.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -162,6 +162,7 @@ static void smap_state_change(struct sock *sk)
		{
		struct smap_psock_map_entry e, tmp;
		struct smap_psock *psock;
		struct socket_wq *wq;
		struct sock *osk;

		rcu_read_lock();
		@@ -171,6 +172,7 @@ static void smap_state_change(struct sock *sk)
		* is established.
		*/
		switch (sk->sk_state) {
		case TCP_SYN_SENT:
		case TCP_SYN_RECV:
		case TCP_ESTABLISHED:
		break;
		@@ -208,6 +210,10 @@ static void smap_state_change(struct sock *sk)
		smap_report_sk_error(psock, EPIPE);
		break;
		}

		wq = rcu_dereference(sk->sk_wq);
		if (skwq_has_sleeper(wq))
		wake_up_interruptible_all(&wq->wait);
		rcu_read_unlock();
		}