@@ -1018,6 +1018,10 @@ enum {
* Arg1: sequence number of 1st byte
* Arg2: # segments
*/
+ BPF_SOCK_OPS_STATE_CB, /* Called when TCP changes state.
+ * Arg1: old_state
+ * Arg2: new_state
+ */
};
#define TCP_BPF_IW 1001 /* Set TCP initial congestion window */
@@ -262,6 +262,7 @@ struct tcp_md5sig {
/* Definitions for bpf_sock_ops_flags */
#define BPF_SOCK_OPS_RTO_CB_FLAG (1<<0)
#define BPF_SOCK_OPS_RETRANS_CB_FLAG (1<<1)
+#define BPF_SOCK_OPS_STATE_CB_FLAG (1<<2)
/* INET_DIAG_MD5SIG */
struct tcp_diag_md5sig {
@@ -2041,6 +2041,8 @@ void tcp_set_state(struct sock *sk, int state)
int oldstate = sk->sk_state;
trace_tcp_set_state(sk, oldstate, state);
+ if (BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk), BPF_SOCK_OPS_STATE_CB_FLAG))
+ tcp_call_bpf_2arg(sk, BPF_SOCK_OPS_STATE_CB, oldstate, state);
switch (state) {
case TCP_ESTABLISHED:
Adds support for calling sock_ops BPF program when there is a TCP state change. Two arguments are used; one for the old state and another for the new state. New op: BPF_SOCK_OPS_STATE_CB. Signed-off-by: Lawrence Brakmo <brakmo@fb.com> --- include/uapi/linux/bpf.h | 4 ++++ include/uapi/linux/tcp.h | 1 + net/ipv4/tcp.c | 2 ++ 3 files changed, 7 insertions(+)