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bpf: sockmap, only create entry if ulp is not already enabled

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Sockmap does not currently support adding sockets after TLS has been
enabled. There never was a real use case for this so it was never
added. But, we lost the test for ULP at some point so add it here
and fail the socket insert if TLS is enabled. Future work could
make sockmap support this use case but fixup the bug here.

Fixes: 604326b41a ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2019-07-19 10:29:21 -07:00 committed by Daniel Borkmann
parent 2bb90e5cc9
commit 0e858739c2
1 changed files with 3 additions and 0 deletions
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3
net/core/sock_map.c
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@ -334,6 +334,7 @@ static int sock_map_update_common(struct bpf_map *map, u32 idx,
struct sock *sk, u64 flags)
{
struct bpf_stab *stab = container_of(map, struct bpf_stab, map);
struct inet_connection_sock *icsk = inet_csk(sk);
struct sk_psock_link *link;
struct sk_psock *psock;
struct sock *osk;
@ -344,6 +345,8 @@ static int sock_map_update_common(struct bpf_map *map, u32 idx,
return -EINVAL;
if (unlikely(idx >= map->max_entries))
return -E2BIG;
if (unlikely(icsk->icsk_ulp_data))
return -EINVAL;
link = sk_psock_init_link();
if (!link)