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bpf: Add BPF_SOCK_OPS_RETRANS_CB

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Adds support for calling sock_ops BPF program when there is a
retransmission. Three arguments are used; one for the sequence number,
another for the number of segments retransmitted, and the last one for
the return value of tcp_transmit_skb (0 => success).
Does not include syn-ack retransmissions.

New op: BPF_SOCK_OPS_RETRANS_CB.

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 16:14:14 -08:00
committed by Alexei Starovoitov
parent 6f9bd3d731
commit a31ad29e6a
2 changed files with 12 additions and 1 deletions
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9
include/uapi/linux/bpf.h
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@@ -1005,7 +1005,8 @@ struct bpf_sock_ops {
/* Definitions for bpf_sock_ops_cb_flags */
#define BPF_SOCK_OPS_RTO_CB_FLAG (1<<0)
#define BPF_SOCK_OPS_ALL_CB_FLAGS 0x1 /* Mask of all currently
#define BPF_SOCK_OPS_RETRANS_CB_FLAG (1<<1)
#define BPF_SOCK_OPS_ALL_CB_FLAGS 0x3 /* Mask of all currently
* supported cb flags
*/
@@ -1047,6 +1048,12 @@ enum {
* Arg2: value of icsk_rto
* Arg3: whether RTO has expired
*/
BPF_SOCK_OPS_RETRANS_CB, /* Called when skb is retransmitted.
* Arg1: sequence number of 1st byte
* Arg2: # segments
* Arg3: return value of
* tcp_transmit_skb (0 => success)
*/
};
#define TCP_BPF_IW 1001 /* Set TCP initial congestion window */