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bpf: sockmap: Don't attach programs to UDP sockets

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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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/20200611172520.327602-1-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2020-06-11 18:25:20 +01:00 committed by Alexei Starovoitov
parent 2c7269b231
commit f6fede8569
1 changed files with 6 additions and 4 deletions
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10
net/core/sock_map.c
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@ -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);