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.
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| @@ -1005,7 +1005,8 @@ struct bpf_sock_ops { · 1004 unmodified lines | ||
| 1005 | 1005 | |
| 1006 | 1006 | /* Definitions for bpf_sock_ops_cb_flags */ |
| 1007 | 1007 | #define BPF_SOCK_OPS_RTO_CB_FLAG (1<<0) |
| 1008 | −#define BPF_SOCK_OPS_ALL_CB_FLAGS 0x1 /* Mask of all currently | |
| 1008 | +#define BPF_SOCK_OPS_RETRANS_CB_FLAG (1<<1) | |
| 1009 | +#define BPF_SOCK_OPS_ALL_CB_FLAGS 0x3 /* Mask of all currently | |
| 1009 | 1010 | * supported cb flags |
| 1010 | 1011 | */ |
| 1011 | 1012 | |
| @@ -1047,6 +1048,12 @@ enum { · 35 unmodified lines | ||
| 1047 | 1048 | * Arg2: value of icsk_rto |
| 1048 | 1049 | * Arg3: whether RTO has expired |
| 1049 | 1050 | */ |
| 1051 | + BPF_SOCK_OPS_RETRANS_CB, /* Called when skb is retransmitted. | |
| 1052 | + * Arg1: sequence number of 1st byte | |
| 1053 | + * Arg2: # segments | |
| 1054 | + * Arg3: return value of | |
| 1055 | + * tcp_transmit_skb (0 => success) | |
| 1056 | + */ | |
| 1050 | 1057 | }; |
| 1051 | 1058 | |
| 1052 | 1059 | #define TCP_BPF_IW 1001 /* Set TCP initial congestion window */ |