diff options
| author | Pengcheng Yang <yangpc@wangsu.com> | 2022-11-29 18:40:39 +0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-12-01 01:07:32 +0100 |
| commit | a351d6087bf7d3d8440d58d3bf244ec64b89394a (patch) | |
| tree | b701f761fd3d6e2bcd554587a06343e0817dd05c /net/ipv4/tcp_bpf.c | |
| parent | 7a9841ca025275b5b0edfb0b618934abb6ceec15 (diff) | |
bpf, sockmap: Fix missing BPF_F_INGRESS flag when using apply_bytes
When redirecting, we use sk_msg_to_ingress() to get the BPF_F_INGRESS
flag from the msg->flags. If apply_bytes is used and it is larger than
the current data being processed, sk_psock_msg_verdict() will not be
called when sendmsg() is called again. At this time, the msg->flags is 0,
and we lost the BPF_F_INGRESS flag.
So we need to save the BPF_F_INGRESS flag in sk_psock and use it when
redirection.
Fixes: 8934ce2fd081 ("bpf: sockmap redirect ingress support")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/1669718441-2654-3-git-send-email-yangpc@wangsu.com
Diffstat (limited to 'net/ipv4/tcp_bpf.c')
| -rw-r--r-- | net/ipv4/tcp_bpf.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index f3e868f4cd9e..275c5ca9e04d 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -131,10 +131,9 @@ static int tcp_bpf_push_locked(struct sock *sk, struct sk_msg *msg, return ret; } -int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg, - u32 bytes, int flags) +int tcp_bpf_sendmsg_redir(struct sock *sk, bool ingress, + struct sk_msg *msg, u32 bytes, int flags) { - bool ingress = sk_msg_to_ingress(msg); struct sk_psock *psock = sk_psock_get(sk); int ret; @@ -276,7 +275,7 @@ msg_bytes_ready: static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock, struct sk_msg *msg, int *copied, int flags) { - bool cork = false, enospc = sk_msg_full(msg); + bool cork = false, enospc = sk_msg_full(msg), redir_ingress; struct sock *sk_redir; u32 tosend, origsize, sent, delta = 0; u32 eval; @@ -322,6 +321,7 @@ more_data: sk_msg_apply_bytes(psock, tosend); break; case __SK_REDIRECT: + redir_ingress = psock->redir_ingress; sk_redir = psock->sk_redir; sk_msg_apply_bytes(psock, tosend); if (!psock->apply_bytes) { @@ -338,7 +338,8 @@ more_data: release_sock(sk); origsize = msg->sg.size; - ret = tcp_bpf_sendmsg_redir(sk_redir, msg, tosend, flags); + ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress, + msg, tosend, flags); sent = origsize - msg->sg.size; if (eval == __SK_REDIRECT) |