tcp_minisocks.c (1cbc99dfe5d7d686fd022647f4e489b5eb8e9068) tcp_minisocks.c (90bbcc608369a1b46089b0f5aa22b8ea31ffa12e)
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Implementation of the Transmission Control Protocol(TCP).
7 *
8 * Authors: Ross Biro

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540 newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
541 newtp->rx_opt.mss_clamp = req->mss;
542 tcp_ecn_openreq_child(newtp, req);
543 newtp->fastopen_rsk = NULL;
544 newtp->syn_data_acked = 0;
545 newtp->rack.mstamp.v64 = 0;
546 newtp->rack.advanced = 0;
547
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Implementation of the Transmission Control Protocol(TCP).
7 *
8 * Authors: Ross Biro

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540 newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
541 newtp->rx_opt.mss_clamp = req->mss;
542 tcp_ecn_openreq_child(newtp, req);
543 newtp->fastopen_rsk = NULL;
544 newtp->syn_data_acked = 0;
545 newtp->rack.mstamp.v64 = 0;
546 newtp->rack.advanced = 0;
547
548 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_PASSIVEOPENS);
548 __TCP_INC_STATS(sock_net(sk), TCP_MIB_PASSIVEOPENS);
549 }
550 return newsk;
551}
552EXPORT_SYMBOL(tcp_create_openreq_child);
553
554/*
555 * Process an incoming packet for SYN_RECV sockets represented as a
556 * request_sock. Normally sk is the listener socket but for TFO it

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699 * should cause reset in unsynchronized states.
700 */
701
702 /* RFC793: "first check sequence number". */
703
704 if (paws_reject || !tcp_in_window(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq,
705 tcp_rsk(req)->rcv_nxt, tcp_rsk(req)->rcv_nxt + req->rsk_rcv_wnd)) {
706 /* Out of window: send ACK and drop. */
549 }
550 return newsk;
551}
552EXPORT_SYMBOL(tcp_create_openreq_child);
553
554/*
555 * Process an incoming packet for SYN_RECV sockets represented as a
556 * request_sock. Normally sk is the listener socket but for TFO it

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699 * should cause reset in unsynchronized states.
700 */
701
702 /* RFC793: "first check sequence number". */
703
704 if (paws_reject || !tcp_in_window(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq,
705 tcp_rsk(req)->rcv_nxt, tcp_rsk(req)->rcv_nxt + req->rsk_rcv_wnd)) {
706 /* Out of window: send ACK and drop. */
707 if (!(flg & TCP_FLAG_RST))
707 if (!(flg & TCP_FLAG_RST) &&
708 !tcp_oow_rate_limited(sock_net(sk), skb,
709 LINUX_MIB_TCPACKSKIPPEDSYNRECV,
710 &tcp_rsk(req)->last_oow_ack_time))
708 req->rsk_ops->send_ack(sk, skb, req);
709 if (paws_reject)
710 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSESTABREJECTED);
711 return NULL;
712 }
713
714 /* In sequence, PAWS is OK. */
715

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721 at tcp_rsk(req)->rcv_isn + 1. */
722 flg &= ~TCP_FLAG_SYN;
723 }
724
725 /* RFC793: "second check the RST bit" and
726 * "fourth, check the SYN bit"
727 */
728 if (flg & (TCP_FLAG_RST|TCP_FLAG_SYN)) {
711 req->rsk_ops->send_ack(sk, skb, req);
712 if (paws_reject)
713 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSESTABREJECTED);
714 return NULL;
715 }
716
717 /* In sequence, PAWS is OK. */
718

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724 at tcp_rsk(req)->rcv_isn + 1. */
725 flg &= ~TCP_FLAG_SYN;
726 }
727
728 /* RFC793: "second check the RST bit" and
729 * "fourth, check the SYN bit"
730 */
731 if (flg & (TCP_FLAG_RST|TCP_FLAG_SYN)) {
729 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_ATTEMPTFAILS);
732 __TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS);
730 goto embryonic_reset;
731 }
732
733 /* ACK sequence verified above, just make sure ACK is
734 * set. If ACK not set, just silently drop the packet.
735 *
736 * XXX (TFO) - if we ever allow "data after SYN", the
737 * following check needs to be removed.

--- 96 unchanged lines hidden --- 		733 goto embryonic_reset;
734 }
735
736 /* ACK sequence verified above, just make sure ACK is
737 * set. If ACK not set, just silently drop the packet.
738 *
739 * XXX (TFO) - if we ever allow "data after SYN", the
740 * following check needs to be removed.

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