hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

tcp: make tcp_rcv_synsent_state_process() drop monitor friend 

1) A valid RST packet should be consumed, to not confuse drop monitor.

2) Same remark for packet validating cross syn setup,
   even if we might ignore part of it.

3) When third packet of 3WHS is delayed, do not pretend
   the SYNACK was dropped.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-04-15 17:10:46 -07:00 committed by David S. Miller
parent e7c89ae407
commit c337578a65
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/ipv4/tcp_input.c
View File

@ -6186,7 +6186,9 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
if (th->rst) {
tcp_reset(sk, skb);
goto discard;
consume:
__kfree_skb(skb);
return 0;
}
/* rfc793:
@ -6275,13 +6277,9 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
tcp_enter_quickack_mode(sk, TCP_MAX_QUICKACKS);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
TCP_DELACK_MAX, TCP_RTO_MAX);
discard:
tcp_drop(sk, skb);
return 0;
} else {
tcp_send_ack(sk);
goto consume;
}
tcp_send_ack(sk);
return -1;
}
@ -6350,7 +6348,7 @@ discard:
*/
return -1;
#else
goto discard;
goto consume;
#endif
}
/* "fifth, if neither of the SYN or RST bits is set then
@ -6360,7 +6358,8 @@ discard:
discard_and_undo:
tcp_clear_options(&tp->rx_opt);
tp->rx_opt.mss_clamp = saved_clamp;
goto discard;
tcp_drop(sk, skb);
return 0;
reset_and_undo:
tcp_clear_options(&tp->rx_opt);