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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>
This commit is contained in:
John Fastabend 2017-08-28 07:12:01 -07:00 committed by David S. Miller
parent 81374aaa26
commit 78aeaaef99
1 changed files with 6 additions and 0 deletions
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6
kernel/bpf/sockmap.c
View File

@ -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();
}