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bpf: Add sock_ops RTO callback

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Adds an optional call to sock_ops BPF program based on whether the
BPF_SOCK_OPS_RTO_CB_FLAG is set in bpf_sock_ops_flags.
The BPF program is passed 2 arguments: icsk_retransmits and whether the
RTO has expired.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lawrence Brakmo 2018-01-25 16:14:11 -08:00 committed by Alexei Starovoitov
parent b13d880721
commit f89013f66d
2 changed files with 14 additions and 1 deletions
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8
include/uapi/linux/bpf.h
View file

@ -982,7 +982,8 @@ struct bpf_sock_ops {
};
/* Definitions for bpf_sock_ops_cb_flags */
#define BPF_SOCK_OPS_ALL_CB_FLAGS 0 /* Mask of all currently
#define BPF_SOCK_OPS_RTO_CB_FLAG (1<<0)
#define BPF_SOCK_OPS_ALL_CB_FLAGS 0x1 /* Mask of all currently
* supported cb flags
*/
@ -1019,6 +1020,11 @@ enum {
* a congestion threshold. RTTs above
* this indicate congestion
*/
BPF_SOCK_OPS_RTO_CB, /* Called when an RTO has triggered.
* Arg1: value of icsk_retransmits
* Arg2: value of icsk_rto
* Arg3: whether RTO has expired
*/
};
#define TCP_BPF_IW 1001 /* Set TCP initial congestion window */

7
net/ipv4/tcp_timer.c
View file

@ -213,11 +213,18 @@ static int tcp_write_timeout(struct sock *sk)
icsk->icsk_user_timeout);
}
tcp_fastopen_active_detect_blackhole(sk, expired);
if (BPF_SOCK_OPS_TEST_FLAG(tp, BPF_SOCK_OPS_RTO_CB_FLAG))
tcp_call_bpf_3arg(sk, BPF_SOCK_OPS_RTO_CB,
icsk->icsk_retransmits,
icsk->icsk_rto, (int)expired);
if (expired) {
/* Has it gone just too far? */
tcp_write_err(sk);
return 1;
}
return 0;
}