From: John Fastabend <john.fastabend@gmail.com>
Date: Thu, 20 Dec 2018 11:35:33 -0800
Subject: bpf: sk_msg, fix socket data_ready events
Patch-mainline: v5.0-rc1
Git-commit: 552de91068828daef50a227a665068cf8dde835e
References: bsc#1109837

When a skb verdict program is in-use and either another BPF program
redirects to that socket or the new SK_PASS support is used the
data_ready callback does not wake up application. Instead because
the stream parser/verdict is using the sk data_ready callback we wake
up the stream parser/verdict block.

Fix this by adding a helper to check if the stream parser block is
enabled on the sk and if so call the saved pointer which is the
upper layers wake up function.

This fixes application stalls observed when an application is waiting
for data in a blocking read().

Fixes: d829e9c4112b ("tls: convert to generic sk_msg interface")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/linux/skmsg.h |    8 ++++++++
 net/core/skmsg.c      |    6 +++---
 net/ipv4/tcp_bpf.c    |    2 +-
 3 files changed, 12 insertions(+), 4 deletions(-)

--- a/include/linux/skmsg.h
+++ b/include/linux/skmsg.h
@@ -407,6 +407,14 @@ static inline void sk_psock_put(struct s
 		sk_psock_drop(sk, psock);
 }
 
+static inline void sk_psock_data_ready(struct sock *sk, struct sk_psock *psock)
+{
+	if (psock->parser.enabled)
+		psock->parser.saved_data_ready(sk);
+	else
+		sk->sk_data_ready(sk);
+}
+
 static inline void psock_set_prog(struct bpf_prog **pprog,
 				  struct bpf_prog *prog)
 {
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -406,7 +406,7 @@ static int sk_psock_skb_ingress(struct s
 	msg->skb = skb;
 
 	sk_psock_queue_msg(psock, msg);
-	sk->sk_data_ready(sk);
+	sk_psock_data_ready(sk, psock);
 	return copied;
 }
 
@@ -738,7 +738,7 @@ static int sk_psock_strp_parse(struct st
 }
 
 /* Called with socket lock held. */
-static void sk_psock_data_ready(struct sock *sk)
+static void sk_psock_strp_data_ready(struct sock *sk)
 {
 	struct sk_psock *psock;
 
@@ -786,7 +786,7 @@ void sk_psock_start_strp(struct sock *sk
 		return;
 
 	parser->saved_data_ready = sk->sk_data_ready;
-	sk->sk_data_ready = sk_psock_data_ready;
+	sk->sk_data_ready = sk_psock_strp_data_ready;
 	sk->sk_write_space = sk_psock_write_space;
 	parser->enabled = true;
 }
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -198,7 +198,7 @@ static int bpf_tcp_ingress(struct sock *
 		msg->sg.start = i;
 		msg->sg.size -= apply_bytes;
 		sk_psock_queue_msg(psock, tmp);
-		sk->sk_data_ready(sk);
+		sk_psock_data_ready(sk, psock);
 	} else {
 		sk_msg_free(sk, tmp);
 		kfree(tmp);