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bpf: Add TCP connection BPF callbacks

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Added callbacks to BPF SOCK_OPS type program before an active
connection is intialized and after a passive or active connection is
established.

The following patch demostrates how they can be used to set send and
receive buffer sizes.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo 2017-06-30 20:02:47 -07:00 • committed by David S. Miller
parent 8c4b4c7e9f
commit 9872a4bde3
4 changed files with 15 additions and 1 deletions
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1
net/ipv4/tcp_fastopen.c
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@ -221,6 +221,7 @@ static struct sock *tcp_fastopen_create_child(struct sock *sk,
tcp_init_congestion_control(child);
tcp_mtup_init(child);
tcp_init_metrics(child);
tcp_call_bpf(child, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB);
tcp_init_buffer_space(child);
tp->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;