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bpf: sockmap: Only check ULP for TCP sockets

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The sock map code checks that a socket does not have an active upper
layer protocol before inserting it into the map. This requires casting
via inet_csk, which isn't valid for UDP sockets.

Guard checks for ULP by checking inet_sk(sk)->is_icsk first.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200309111243.6982-2-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2020-03-09 11:12:32 +00:00 • committed by Daniel Borkmann
parent 3e7c67d90e
commit 7b70973d7e
4 changed files with 15 additions and 12 deletions
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8
include/linux/skmsg.h
View file

@ -360,7 +360,13 @@ static inline void sk_psock_restore_proto(struct sock *sk,
struct sk_psock *psock)
{
sk->sk_prot->unhash = psock->saved_unhash;
tcp_update_ulp(sk, psock->sk_proto, psock->saved_write_space);
if (inet_csk_has_ulp(sk)) {
tcp_update_ulp(sk, psock->sk_proto, psock->saved_write_space);
} else {
sk->sk_write_space = psock->saved_write_space;
/* Pairs with lockless read in sk_clone_lock() */
WRITE_ONCE(sk->sk_prot, psock->sk_proto);
}
}
static inline void sk_psock_set_state(struct sk_psock *psock,