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* [PATCH bpf] bpf: sockmap: don't attach programs to UDP sockets
@ 2020-06-11 17:25 Lorenz Bauer
  2020-06-12 10:17 ` Jakub Sitnicki
  0 siblings, 1 reply; 3+ messages in thread
From: Lorenz Bauer @ 2020-06-11 17:25 UTC (permalink / raw)
  To: John Fastabend, Daniel Borkmann, Jakub Sitnicki, Lorenz Bauer,
	David S. Miller, Jakub Kicinski, Alexei Starovoitov
  Cc: kernel-team, netdev, bpf, linux-kernel

The stream parser infrastructure isn't set up to deal with UDP
sockets, so we mustn't try to attach programs to them.

I remember making this change at some point, but I must have lost
it while rebasing or something similar.

Fixes: 7b98cd42b049 ("bpf: sockmap: Add UDP support")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
 net/core/sock_map.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 00a26cf2cfe9..35cea36f3892 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -424,10 +424,7 @@ static int sock_map_get_next_key(struct bpf_map *map, void *key, void *next)
 	return 0;
 }
 
-static bool sock_map_redirect_allowed(const struct sock *sk)
-{
-	return sk->sk_state != TCP_LISTEN;
-}
+static bool sock_map_redirect_allowed(const struct sock *sk);
 
 static int sock_map_update_common(struct bpf_map *map, u32 idx,
 				  struct sock *sk, u64 flags)
@@ -508,6 +505,11 @@ static bool sk_is_udp(const struct sock *sk)
 	       sk->sk_protocol == IPPROTO_UDP;
 }
 
+static bool sock_map_redirect_allowed(const struct sock *sk)
+{
+	return sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN;
+}
+
 static bool sock_map_sk_is_suitable(const struct sock *sk)
 {
 	return sk_is_tcp(sk) || sk_is_udp(sk);
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-06-12 22:55 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-06-11 17:25 [PATCH bpf] bpf: sockmap: don't attach programs to UDP sockets Lorenz Bauer
2020-06-12 10:17 ` Jakub Sitnicki
2020-06-12 22:54   ` John Fastabend

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