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bpf: Support passing args to sock_ops bpf function

Browse source 
Adds support for passing up to 4 arguments to sock_ops bpf functions. It
reusues the reply union, so the bpf_sock_ops structures are not
increased in size.

Signed-off-by: Lawrence Brakmo <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
This commit is contained in:
Lawrence Brakmo 2018-01-25 16:14:09 -08:00 • committed by Alexei Starovoitov
commit de525be2ca
6 changed files with 42 additions and 10 deletions
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2
net/ipv4/tcp.c
View file

@ -463,7 +463,7 @@ void tcp_init_transfer(struct sock *sk, int bpf_op)
tcp_mtup_init(sk);
icsk->icsk_af_ops->rebuild_header(sk);
tcp_init_metrics(sk);
tcp_call_bpf(sk, bpf_op);
tcp_call_bpf(sk, bpf_op, 0, NULL);
tcp_init_congestion_control(sk);
tcp_init_buffer_space(sk);
}

2
net/ipv4/tcp_nv.c
View file

@ -146,7 +146,7 @@ static void tcpnv_init(struct sock *sk)
* within a datacenter, where we have reasonable estimates of
* RTTs
*/
base_rtt = tcp_call_bpf(sk, BPF_SOCK_OPS_BASE_RTT);
base_rtt = tcp_call_bpf(sk, BPF_SOCK_OPS_BASE_RTT, 0, NULL);
if (base_rtt > 0) {
ca->nv_base_rtt = base_rtt;
ca->nv_lower_bound_rtt = (base_rtt * 205) >> 8; /* 80% */

2
net/ipv4/tcp_output.c
View file

@ -3469,7 +3469,7 @@ int tcp_connect(struct sock *sk)
struct sk_buff *buff;
int err;
tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_CONNECT_CB);
tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_CONNECT_CB, 0, NULL);
if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk))
return -EHOSTUNREACH; /* Routing failure or similar. */