tcp: TCP Fast Open Server - main code path
This patch adds the main processing path to complete the TFO server patches. A TFO request (i.e., SYN+data packet with a TFO cookie option) first gets processed in tcp_v4_conn_request(). If it passes the various TFO checks by tcp_fastopen_check(), a child socket will be created right away to be accepted by applications, rather than waiting for the 3WHS to finish. In additon to the use of TFO cookie, a simple max_qlen based scheme is put in place to fend off spoofed TFO attack. When a valid ACK comes back to tcp_rcv_state_process(), it will cause the state of the child socket to switch from either TCP_SYN_RECV to TCP_ESTABLISHED, or TCP_FIN_WAIT1 to TCP_FIN_WAIT2. At this time retransmission will resume for any unack'ed (data, FIN,...) segments. Signed-off-by: H.K. Jerry Chu <hkchu@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
8336886f78
Коммит
168a8f5805
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@ -3127,6 +3127,12 @@ void tcp_rearm_rto(struct sock *sk)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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/* If the retrans timer is currently being used by Fast Open
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* for SYN-ACK retrans purpose, stay put.
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*/
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if (tp->fastopen_rsk)
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return;
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if (!tp->packets_out) {
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inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
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} else {
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@ -5895,7 +5901,9 @@ discard:
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tcp_send_synack(sk);
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#if 0
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/* Note, we could accept data and URG from this segment.
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* There are no obstacles to make this.
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* There are no obstacles to make this (except that we must
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* either change tcp_recvmsg() to prevent it from returning data
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* before 3WHS completes per RFC793, or employ TCP Fast Open).
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*
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* However, if we ignore data in ACKless segments sometimes,
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* we have no reasons to accept it sometimes.
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@ -5935,6 +5943,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct request_sock *req;
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int queued = 0;
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tp->rx_opt.saw_tstamp = 0;
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@ -5990,7 +5999,14 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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return 0;
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}
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if (!tcp_validate_incoming(sk, skb, th, 0))
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req = tp->fastopen_rsk;
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if (req != NULL) {
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BUG_ON(sk->sk_state != TCP_SYN_RECV &&
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sk->sk_state != TCP_FIN_WAIT1);
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if (tcp_check_req(sk, skb, req, NULL, true) == NULL)
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goto discard;
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} else if (!tcp_validate_incoming(sk, skb, th, 0))
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return 0;
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/* step 5: check the ACK field */
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@ -6000,7 +6016,22 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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switch (sk->sk_state) {
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case TCP_SYN_RECV:
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if (acceptable) {
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tp->copied_seq = tp->rcv_nxt;
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/* Once we leave TCP_SYN_RECV, we no longer
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* need req so release it.
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*/
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if (req) {
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reqsk_fastopen_remove(sk, req, false);
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} else {
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/* Make sure socket is routed, for
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* correct metrics.
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*/
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icsk->icsk_af_ops->rebuild_header(sk);
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tcp_init_congestion_control(sk);
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tcp_mtup_init(sk);
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tcp_init_buffer_space(sk);
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tp->copied_seq = tp->rcv_nxt;
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}
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smp_mb();
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tcp_set_state(sk, TCP_ESTABLISHED);
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sk->sk_state_change(sk);
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@ -6022,23 +6053,27 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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if (tp->rx_opt.tstamp_ok)
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tp->advmss -= TCPOLEN_TSTAMP_ALIGNED;
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/* Make sure socket is routed, for
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* correct metrics.
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*/
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icsk->icsk_af_ops->rebuild_header(sk);
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tcp_init_metrics(sk);
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tcp_init_congestion_control(sk);
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if (req) {
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/* Re-arm the timer because data may
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* have been sent out. This is similar
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* to the regular data transmission case
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* when new data has just been ack'ed.
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*
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* (TFO) - we could try to be more
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* aggressive and retranmitting any data
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* sooner based on when they were sent
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* out.
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*/
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tcp_rearm_rto(sk);
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} else
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tcp_init_metrics(sk);
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/* Prevent spurious tcp_cwnd_restart() on
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* first data packet.
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*/
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tp->lsndtime = tcp_time_stamp;
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tcp_mtup_init(sk);
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tcp_initialize_rcv_mss(sk);
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tcp_init_buffer_space(sk);
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tcp_fast_path_on(tp);
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} else {
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return 1;
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@ -6046,6 +6081,16 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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break;
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case TCP_FIN_WAIT1:
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/* If we enter the TCP_FIN_WAIT1 state and we are a
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* Fast Open socket and this is the first acceptable
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* ACK we have received, this would have acknowledged
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* our SYNACK so stop the SYNACK timer.
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*/
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if (acceptable && req != NULL) {
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/* We no longer need the request sock. */
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reqsk_fastopen_remove(sk, req, false);
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tcp_rearm_rto(sk);
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}
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if (tp->snd_una == tp->write_seq) {
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struct dst_entry *dst;
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@ -352,6 +352,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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const int code = icmp_hdr(icmp_skb)->code;
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struct sock *sk;
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struct sk_buff *skb;
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struct request_sock *req;
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__u32 seq;
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__u32 remaining;
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int err;
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@ -394,9 +395,12 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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icsk = inet_csk(sk);
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tp = tcp_sk(sk);
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req = tp->fastopen_rsk;
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seq = ntohl(th->seq);
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if (sk->sk_state != TCP_LISTEN &&
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!between(seq, tp->snd_una, tp->snd_nxt)) {
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!between(seq, tp->snd_una, tp->snd_nxt) &&
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(req == NULL || seq != tcp_rsk(req)->snt_isn)) {
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/* For a Fast Open socket, allow seq to be snt_isn. */
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NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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goto out;
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}
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@ -435,6 +439,8 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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!icsk->icsk_backoff)
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break;
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/* XXX (TFO) - revisit the following logic for TFO */
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if (sock_owned_by_user(sk))
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break;
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@ -466,6 +472,14 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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goto out;
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}
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/* XXX (TFO) - if it's a TFO socket and has been accepted, rather
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* than following the TCP_SYN_RECV case and closing the socket,
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* we ignore the ICMP error and keep trying like a fully established
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* socket. Is this the right thing to do?
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*/
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if (req && req->sk == NULL)
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goto out;
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switch (sk->sk_state) {
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struct request_sock *req, **prev;
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case TCP_LISTEN:
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@ -498,7 +512,8 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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case TCP_SYN_SENT:
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case TCP_SYN_RECV: /* Cannot happen.
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It can f.e. if SYNs crossed.
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It can f.e. if SYNs crossed,
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or Fast Open.
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*/
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if (!sock_owned_by_user(sk)) {
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sk->sk_err = err;
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@ -809,8 +824,12 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
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static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
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struct request_sock *req)
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{
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tcp_v4_send_ack(skb, tcp_rsk(req)->snt_isn + 1,
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tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd,
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/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
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* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
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*/
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tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ?
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tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
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tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
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req->ts_recent,
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0,
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tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr,
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@ -1272,6 +1291,178 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
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};
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#endif
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static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb,
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struct request_sock *req,
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struct tcp_fastopen_cookie *foc,
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struct tcp_fastopen_cookie *valid_foc)
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{
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bool skip_cookie = false;
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struct fastopen_queue *fastopenq;
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if (likely(!fastopen_cookie_present(foc))) {
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/* See include/net/tcp.h for the meaning of these knobs */
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if ((sysctl_tcp_fastopen & TFO_SERVER_ALWAYS) ||
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((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_REQD) &&
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(TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1)))
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skip_cookie = true; /* no cookie to validate */
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else
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return false;
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}
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fastopenq = inet_csk(sk)->icsk_accept_queue.fastopenq;
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/* A FO option is present; bump the counter. */
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NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVE);
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/* Make sure the listener has enabled fastopen, and we don't
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* exceed the max # of pending TFO requests allowed before trying
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* to validating the cookie in order to avoid burning CPU cycles
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* unnecessarily.
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*
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* XXX (TFO) - The implication of checking the max_qlen before
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* processing a cookie request is that clients can't differentiate
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* between qlen overflow causing Fast Open to be disabled
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* temporarily vs a server not supporting Fast Open at all.
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*/
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if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) == 0 ||
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fastopenq == NULL || fastopenq->max_qlen == 0)
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return false;
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if (fastopenq->qlen >= fastopenq->max_qlen) {
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struct request_sock *req1;
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spin_lock(&fastopenq->lock);
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req1 = fastopenq->rskq_rst_head;
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if ((req1 == NULL) || time_after(req1->expires, jiffies)) {
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spin_unlock(&fastopenq->lock);
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NET_INC_STATS_BH(sock_net(sk),
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LINUX_MIB_TCPFASTOPENLISTENOVERFLOW);
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/* Avoid bumping LINUX_MIB_TCPFASTOPENPASSIVEFAIL*/
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foc->len = -1;
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return false;
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}
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fastopenq->rskq_rst_head = req1->dl_next;
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fastopenq->qlen--;
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spin_unlock(&fastopenq->lock);
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reqsk_free(req1);
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}
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if (skip_cookie) {
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tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
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return true;
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}
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if (foc->len == TCP_FASTOPEN_COOKIE_SIZE) {
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if ((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_CHKED) == 0) {
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tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc);
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if ((valid_foc->len != TCP_FASTOPEN_COOKIE_SIZE) ||
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memcmp(&foc->val[0], &valid_foc->val[0],
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TCP_FASTOPEN_COOKIE_SIZE) != 0)
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return false;
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valid_foc->len = -1;
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}
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/* Acknowledge the data received from the peer. */
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tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
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return true;
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} else if (foc->len == 0) { /* Client requesting a cookie */
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tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc);
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NET_INC_STATS_BH(sock_net(sk),
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LINUX_MIB_TCPFASTOPENCOOKIEREQD);
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} else {
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/* Client sent a cookie with wrong size. Treat it
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* the same as invalid and return a valid one.
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*/
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tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc);
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}
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return false;
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}
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static int tcp_v4_conn_req_fastopen(struct sock *sk,
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struct sk_buff *skb,
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struct sk_buff *skb_synack,
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struct request_sock *req,
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struct request_values *rvp)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
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const struct inet_request_sock *ireq = inet_rsk(req);
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struct sock *child;
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req->retrans = 0;
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req->sk = NULL;
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child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL);
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if (child == NULL) {
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NET_INC_STATS_BH(sock_net(sk),
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LINUX_MIB_TCPFASTOPENPASSIVEFAIL);
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kfree_skb(skb_synack);
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return -1;
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}
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ip_build_and_send_pkt(skb_synack, sk, ireq->loc_addr,
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ireq->rmt_addr, ireq->opt);
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/* XXX (TFO) - is it ok to ignore error and continue? */
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spin_lock(&queue->fastopenq->lock);
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queue->fastopenq->qlen++;
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spin_unlock(&queue->fastopenq->lock);
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/* Initialize the child socket. Have to fix some values to take
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* into account the child is a Fast Open socket and is created
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* only out of the bits carried in the SYN packet.
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*/
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tp = tcp_sk(child);
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tp->fastopen_rsk = req;
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/* Do a hold on the listner sk so that if the listener is being
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* closed, the child that has been accepted can live on and still
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* access listen_lock.
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*/
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sock_hold(sk);
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tcp_rsk(req)->listener = sk;
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/* RFC1323: The window in SYN & SYN/ACK segments is never
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* scaled. So correct it appropriately.
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*/
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tp->snd_wnd = ntohs(tcp_hdr(skb)->window);
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/* Activate the retrans timer so that SYNACK can be retransmitted.
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* The request socket is not added to the SYN table of the parent
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* because it's been added to the accept queue directly.
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*/
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inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS,
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TCP_TIMEOUT_INIT, TCP_RTO_MAX);
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/* Add the child socket directly into the accept queue */
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inet_csk_reqsk_queue_add(sk, req, child);
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/* Now finish processing the fastopen child socket. */
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inet_csk(child)->icsk_af_ops->rebuild_header(child);
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tcp_init_congestion_control(child);
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tcp_mtup_init(child);
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tcp_init_buffer_space(child);
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tcp_init_metrics(child);
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/* Queue the data carried in the SYN packet. We need to first
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* bump skb's refcnt because the caller will attempt to free it.
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*
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* XXX (TFO) - we honor a zero-payload TFO request for now.
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* (Any reason not to?)
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*/
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if (TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq + 1) {
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/* Don't queue the skb if there is no payload in SYN.
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* XXX (TFO) - How about SYN+FIN?
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*/
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tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
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} else {
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skb = skb_get(skb);
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skb_dst_drop(skb);
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__skb_pull(skb, tcp_hdr(skb)->doff * 4);
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skb_set_owner_r(skb, child);
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__skb_queue_tail(&child->sk_receive_queue, skb);
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tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
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}
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sk->sk_data_ready(sk, 0);
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bh_unlock_sock(child);
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sock_put(child);
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WARN_ON(req->sk == NULL);
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return 0;
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}
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int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
|
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{
|
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struct tcp_extend_values tmp_ext;
|
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|
@ -1285,6 +1476,11 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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__be32 daddr = ip_hdr(skb)->daddr;
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__u32 isn = TCP_SKB_CB(skb)->when;
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bool want_cookie = false;
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struct flowi4 fl4;
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struct tcp_fastopen_cookie foc = { .len = -1 };
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struct tcp_fastopen_cookie valid_foc = { .len = -1 };
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struct sk_buff *skb_synack;
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int do_fastopen;
|
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|
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/* Never answer to SYNs send to broadcast or multicast */
|
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if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
|
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|
@ -1319,7 +1515,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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tcp_clear_options(&tmp_opt);
|
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tmp_opt.mss_clamp = TCP_MSS_DEFAULT;
|
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tmp_opt.user_mss = tp->rx_opt.user_mss;
|
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tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL);
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tcp_parse_options(skb, &tmp_opt, &hash_location, 0,
|
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want_cookie ? NULL : &foc);
|
||||
|
||||
if (tmp_opt.cookie_plus > 0 &&
|
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tmp_opt.saw_tstamp &&
|
||||
|
@ -1377,8 +1574,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
|
|||
isn = cookie_v4_init_sequence(sk, skb, &req->mss);
|
||||
req->cookie_ts = tmp_opt.tstamp_ok;
|
||||
} else if (!isn) {
|
||||
struct flowi4 fl4;
|
||||
|
||||
/* VJ's idea. We save last timestamp seen
|
||||
* from the destination in peer table, when entering
|
||||
* state TIME-WAIT, and check against it before
|
||||
|
@ -1419,14 +1614,52 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
|
|||
tcp_rsk(req)->snt_isn = isn;
|
||||
tcp_rsk(req)->snt_synack = tcp_time_stamp;
|
||||
|
||||
if (tcp_v4_send_synack(sk, dst, req,
|
||||
(struct request_values *)&tmp_ext,
|
||||
skb_get_queue_mapping(skb),
|
||||
want_cookie) ||
|
||||
want_cookie)
|
||||
if (dst == NULL) {
|
||||
dst = inet_csk_route_req(sk, &fl4, req);
|
||||
if (dst == NULL)
|
||||
goto drop_and_free;
|
||||
}
|
||||
do_fastopen = tcp_fastopen_check(sk, skb, req, &foc, &valid_foc);
|
||||
|
||||
/* We don't call tcp_v4_send_synack() directly because we need
|
||||
* to make sure a child socket can be created successfully before
|
||||
* sending back synack!
|
||||
*
|
||||
* XXX (TFO) - Ideally one would simply call tcp_v4_send_synack()
|
||||
* (or better yet, call tcp_send_synack() in the child context
|
||||
* directly, but will have to fix bunch of other code first)
|
||||
* after syn_recv_sock() except one will need to first fix the
|
||||
* latter to remove its dependency on the current implementation
|
||||
* of tcp_v4_send_synack()->tcp_select_initial_window().
|
||||
*/
|
||||
skb_synack = tcp_make_synack(sk, dst, req,
|
||||
(struct request_values *)&tmp_ext,
|
||||
fastopen_cookie_present(&valid_foc) ? &valid_foc : NULL);
|
||||
|
||||
if (skb_synack) {
|
||||
__tcp_v4_send_check(skb_synack, ireq->loc_addr, ireq->rmt_addr);
|
||||
skb_set_queue_mapping(skb_synack, skb_get_queue_mapping(skb));
|
||||
} else
|
||||
goto drop_and_free;
|
||||
|
||||
if (likely(!do_fastopen)) {
|
||||
int err;
|
||||
err = ip_build_and_send_pkt(skb_synack, sk, ireq->loc_addr,
|
||||
ireq->rmt_addr, ireq->opt);
|
||||
err = net_xmit_eval(err);
|
||||
if (err || want_cookie)
|
||||
goto drop_and_free;
|
||||
|
||||
tcp_rsk(req)->listener = NULL;
|
||||
/* Add the request_sock to the SYN table */
|
||||
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
|
||||
if (fastopen_cookie_present(&foc) && foc.len != 0)
|
||||
NET_INC_STATS_BH(sock_net(sk),
|
||||
LINUX_MIB_TCPFASTOPENPASSIVEFAIL);
|
||||
} else if (tcp_v4_conn_req_fastopen(sk, skb, skb_synack, req,
|
||||
(struct request_values *)&tmp_ext))
|
||||
goto drop_and_free;
|
||||
|
||||
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
|
||||
return 0;
|
||||
|
||||
drop_and_release:
|
||||
|
@ -1977,6 +2210,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
|
|||
tcp_cookie_values_release);
|
||||
tp->cookie_values = NULL;
|
||||
}
|
||||
BUG_ON(tp->fastopen_rsk != NULL);
|
||||
|
||||
/* If socket is aborted during connect operation */
|
||||
tcp_free_fastopen_req(tp);
|
||||
|
@ -2425,6 +2659,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len)
|
|||
const struct tcp_sock *tp = tcp_sk(sk);
|
||||
const struct inet_connection_sock *icsk = inet_csk(sk);
|
||||
const struct inet_sock *inet = inet_sk(sk);
|
||||
struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq;
|
||||
__be32 dest = inet->inet_daddr;
|
||||
__be32 src = inet->inet_rcv_saddr;
|
||||
__u16 destp = ntohs(inet->inet_dport);
|
||||
|
@ -2469,7 +2704,9 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len)
|
|||
jiffies_to_clock_t(icsk->icsk_ack.ato),
|
||||
(icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
|
||||
tp->snd_cwnd,
|
||||
tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh,
|
||||
sk->sk_state == TCP_LISTEN ?
|
||||
(fastopenq ? fastopenq->max_qlen : 0) :
|
||||
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh),
|
||||
len);
|
||||
}
|
||||
|
||||
|
|
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