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authorAndrey Ignatov <rdna@fb.com>2018-07-11 17:33:32 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-07-15 00:08:41 +0200
commitf333ee0cdb27ba201e6cc0c99c76b1364aa29b86 (patch)
tree25adc31f92c445a646f096add42655410e784b9d /net/ipv4/af_inet.c
parentbpf: btf: print map dump and lookup with btf info (diff)
downloadlinux-dev-f333ee0cdb27ba201e6cc0c99c76b1364aa29b86.tar.xz
linux-dev-f333ee0cdb27ba201e6cc0c99c76b1364aa29b86.zip
bpf: Add BPF_SOCK_OPS_TCP_LISTEN_CB
Add new TCP-BPF callback that is called on listen(2) right after socket transition to TCP_LISTEN state. It fills the gap for listening sockets in TCP-BPF. For example BPF program can set BPF_SOCK_OPS_STATE_CB_FLAG when socket becomes listening and track later transition from TCP_LISTEN to TCP_CLOSE with BPF_SOCK_OPS_STATE_CB callback. Before there was no way to do it with TCP-BPF and other options were much harder to work with. E.g. socket state tracking can be done with tracepoints (either raw or regular) but they can't be attached to cgroup and their lifetime has to be managed separately. Signed-off-by: Andrey Ignatov <rdna@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/ipv4/af_inet.c')
-rw-r--r--net/ipv4/af_inet.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index c716be13d58c..f2a0a3bab6b5 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -229,6 +229,7 @@ int inet_listen(struct socket *sock, int backlog)
err = inet_csk_listen_start(sk, backlog);
if (err)
goto out;
+ tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
}
sk->sk_max_ack_backlog = backlog;
err = 0;