|
k_put(inet_twsk(sk));
30. sk = sk2;
31. goto process;
32. }
33. /* Fall through to ACK */
34. }
35. case TCP_TW_ACK:
36. tcp_v4_timewait_ack(sk, skb);
37. break; 论文网
38. case TCP_TW_RST:
39. goto no_tcp_socket;
40. case TCP_TW_SUCCESS:;
41. }
42. goto discard_it;
43.}
int tcp_v4_rcv(struct sk_buff *skb)
{
......
sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
if (!sk)
goto no_tcp_socket;
process:
if (sk->sk_state == TCP_TIME_WAIT)
goto do_time_wait;
......
discard_it:
/* Discard frame. */
kfree_skb(skb);
return 0;
......
do_time_wait:
......
switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
case TCP_TW_SYN: {
struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev),
&tcp_hashinfo,
iph->daddr, th->dest,
inet_iif(skb));
if (sk2) {
inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row);
inet_twsk_put(inet_twsk(sk));
sk = sk2;
goto process;
}
/* Fall through to ACK */
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