From: John Fastabend Date: Mon, 28 Aug 2017 14:12:01 +0000 (-0700) Subject: bpf: sockmap indicate sock events to listeners X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=78aeaaef997db7096a17d0d3572a7940ffa5c9a0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: David S. Miller --- diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c index 38bf4e4ae2fd..bcc326a2e5ce 100644 --- a/kernel/bpf/sockmap.c +++ b/kernel/bpf/sockmap.c @@ -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(); }