diff options
| author | Martin KaFai Lau <martin.lau@kernel.org> | 2025-01-29 13:31:19 -0800 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2025-01-29 13:33:10 -0800 |
| commit | 9bf412d4d5b1f431e6cdd8111094be39c031036c (patch) | |
| tree | f01b165541b84bf465130e3e20902b031391fe37 /net/core/sock_map.c | |
| parent | bc27c52eea189e8f7492d40739b7746d67b65beb (diff) | |
| parent | 6fcfe96e0f6e9bebe1b185f1548a9a8cb1b68dea (diff) | |
Merge branch 'bpf-fix-wrong-copied_seq-calculation-and-add-tests'
Jiayuan Chen says:
====================
A previous commit described in this topic
http://lore.kernel.org/bpf/20230523025618.113937-9-john.fastabend@gmail.com
directly updated 'sk->copied_seq' in the tcp_eat_skb() function when the
action of a BPF program was SK_REDIRECT. For other actions, like SK_PASS,
the update logic for 'sk->copied_seq' was moved to
tcp_bpf_recvmsg_parser() to ensure the accuracy of the 'fionread' feature.
That commit works for a single stream_verdict scenario, as it also
modified 'sk_data_ready->sk_psock_verdict_data_ready->tcp_read_skb'
to remove updating 'sk->copied_seq'.
However, for programs where both stream_parser and stream_verdict are
active (strparser purpose), tcp_read_sock() was used instead of
tcp_read_skb() (sk_data_ready->strp_data_ready->tcp_read_sock).
tcp_read_sock() now still updates 'sk->copied_seq', leading to duplicated
updates.
In summary, for strparser + SK_PASS, copied_seq is redundantly calculated
in both tcp_read_sock() and tcp_bpf_recvmsg_parser().
The issue causes incorrect copied_seq calculations, which prevent
correct data reads from the recv() interface in user-land.
Also we added test cases for bpf + strparser and separated them from
sockmap_basic, as strparser has more encapsulation and parsing
capabilities compared to sockmap.
====================
Link: https://patch.msgid.link/20250122100917.49845-1-mrpre@163.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'net/core/sock_map.c')
| -rw-r--r-- | net/core/sock_map.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/core/sock_map.c b/net/core/sock_map.c index f1b9b3958792..3b0f59d9b4db 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -303,7 +303,10 @@ static int sock_map_link(struct bpf_map *map, struct sock *sk) write_lock_bh(&sk->sk_callback_lock); if (stream_parser && stream_verdict && !psock->saved_data_ready) { - ret = sk_psock_init_strp(sk, psock); + if (sk_is_tcp(sk)) + ret = sk_psock_init_strp(sk, psock); + else + ret = -EOPNOTSUPP; if (ret) { write_unlock_bh(&sk->sk_callback_lock); sk_psock_put(sk, psock); |