From: John Fastabend john.fastabend@gmail.com
[ Upstream commit 552de91068828daef50a227a665068cf8dde835e ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/skmsg.h | 8 ++++++++ net/core/skmsg.c | 6 +++--- net/ipv4/tcp_bpf.c | 2 +- 3 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h index 2a11e9d91dfa..36bd85863081 100644 --- a/include/linux/skmsg.h +++ b/include/linux/skmsg.h @@ -416,6 +416,14 @@ static inline void sk_psock_put(struct sock *sk, struct sk_psock *psock) 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) { diff --git a/net/core/skmsg.c b/net/core/skmsg.c index fc7d59f1c57c..54d854807630 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -406,7 +406,7 @@ static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb) msg->skb = skb;
sk_psock_queue_msg(psock, msg); - sk->sk_data_ready(sk); + sk_psock_data_ready(sk, psock); return copied; }
@@ -739,7 +739,7 @@ static int sk_psock_strp_parse(struct strparser *strp, struct sk_buff *skb) }
/* 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;
@@ -787,7 +787,7 @@ void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock) 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; } diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index 3b45fe530f91..2d6bd7a59b2c 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -198,7 +198,7 @@ static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock, 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);