26 static u32 tcp_clamp_rto_to_user_timeout(const struct sock *sk)  in tcp_clamp_rto_to_user_timeout()  argument
28 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_clamp_rto_to_user_timeout()
32 	start_ts = tcp_sk(sk)->retrans_stamp;  in tcp_clamp_rto_to_user_timeout()
36 	elapsed = tcp_time_stamp(tcp_sk(sk)) - start_ts;  in tcp_clamp_rto_to_user_timeout()
44 u32 tcp_clamp_probe0_to_user_timeout(const struct sock *sk, u32 when)  in tcp_clamp_probe0_to_user_timeout()  argument
46 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_clamp_probe0_to_user_timeout()
70 static void tcp_write_err(struct sock *sk)  in tcp_write_err()  argument
72 	WRITE_ONCE(sk->sk_err, READ_ONCE(sk->sk_err_soft) ? : ETIMEDOUT);  in tcp_write_err()
73 	sk_error_report(sk);  in tcp_write_err()
75 	tcp_write_queue_purge(sk);  in tcp_write_err()
76 	tcp_done(sk);  in tcp_write_err()
77 	__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONTIMEOUT);  in tcp_write_err()
104 static int tcp_out_of_resources(struct sock *sk, bool do_reset)  in tcp_out_of_resources()  argument
106 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_out_of_resources()
115 	if (READ_ONCE(sk->sk_err_soft))  in tcp_out_of_resources()
118 	if (tcp_check_oom(sk, shift)) {  in tcp_out_of_resources()
126 			tcp_send_active_reset(sk, GFP_ATOMIC);  in tcp_out_of_resources()
127 		tcp_done(sk);  in tcp_out_of_resources()
128 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONMEMORY);  in tcp_out_of_resources()
132 	if (!check_net(sock_net(sk))) {  in tcp_out_of_resources()
134 		tcp_done(sk);  in tcp_out_of_resources()
146 static int tcp_orphan_retries(struct sock *sk, bool alive)  in tcp_orphan_retries()  argument
148 	int retries = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_orphan_retries); /* May be zero. */  in tcp_orphan_retries()
151 	if (READ_ONCE(sk->sk_err_soft) && !alive)  in tcp_orphan_retries()
162 static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)  in tcp_mtu_probing()  argument
164 	const struct net *net = sock_net(sk);  in tcp_mtu_probing()
175 		mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;  in tcp_mtu_probing()
179 		icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);  in tcp_mtu_probing()
181 	tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);  in tcp_mtu_probing()
184 static unsigned int tcp_model_timeout(struct sock *sk,  in tcp_model_timeout()  argument
211 static bool retransmits_timed_out(struct sock *sk,  in retransmits_timed_out()  argument
217 	if (!inet_csk(sk)->icsk_retransmits)  in retransmits_timed_out()
220 	start_ts = tcp_sk(sk)->retrans_stamp;  in retransmits_timed_out()
224 		if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))  in retransmits_timed_out()
225 			rto_base = tcp_timeout_init(sk);  in retransmits_timed_out()
226 		timeout = tcp_model_timeout(sk, boundary, rto_base);  in retransmits_timed_out()
229 	return (s32)(tcp_time_stamp(tcp_sk(sk)) - start_ts - timeout) >= 0;  in retransmits_timed_out()
233 static int tcp_write_timeout(struct sock *sk)  in tcp_write_timeout()  argument
235 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timeout()
236 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_write_timeout()
237 	struct net *net = sock_net(sk);  in tcp_write_timeout()
241 	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {  in tcp_write_timeout()
243 			__dst_negative_advice(sk);  in tcp_write_timeout()
249 		if (sk->sk_state == TCP_SYN_SENT)  in tcp_write_timeout()
254 		if (retransmits_timed_out(sk, READ_ONCE(net->ipv4.sysctl_tcp_retries1), 0)) {  in tcp_write_timeout()
256 			tcp_mtu_probing(icsk, sk);  in tcp_write_timeout()
258 			__dst_negative_advice(sk);  in tcp_write_timeout()
262 		if (sock_flag(sk, SOCK_DEAD)) {  in tcp_write_timeout()
265 			retry_until = tcp_orphan_retries(sk, alive);  in tcp_write_timeout()
267 				!retransmits_timed_out(sk, retry_until, 0);  in tcp_write_timeout()
269 			if (tcp_out_of_resources(sk, do_reset))  in tcp_write_timeout()
274 		expired = retransmits_timed_out(sk, retry_until,  in tcp_write_timeout()
276 	tcp_fastopen_active_detect_blackhole(sk, expired);  in tcp_write_timeout()
279 		tcp_call_bpf_3arg(sk, BPF_SOCK_OPS_RTO_CB,  in tcp_write_timeout()
285 		tcp_write_err(sk);  in tcp_write_timeout()
289 	if (sk_rethink_txhash(sk)) {  in tcp_write_timeout()
291 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPTIMEOUTREHASH);  in tcp_write_timeout()
298 void tcp_delack_timer_handler(struct sock *sk)  in tcp_delack_timer_handler()  argument
300 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_delack_timer_handler()
301 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_delack_timer_handler()
303 	if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))  in tcp_delack_timer_handler()
309 		tcp_sack_compress_send_ack(sk);  in tcp_delack_timer_handler()
317 		sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);  in tcp_delack_timer_handler()
322 	if (inet_csk_ack_scheduled(sk)) {  in tcp_delack_timer_handler()
323 		if (!inet_csk_in_pingpong_mode(sk)) {  in tcp_delack_timer_handler()
330 			inet_csk_exit_pingpong_mode(sk);  in tcp_delack_timer_handler()
334 		tcp_send_ack(sk);  in tcp_delack_timer_handler()
335 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKS);  in tcp_delack_timer_handler()
353 	struct sock *sk = &icsk->icsk_inet.sk;  in tcp_delack_timer()  local
355 	bh_lock_sock(sk);  in tcp_delack_timer()
356 	if (!sock_owned_by_user(sk)) {  in tcp_delack_timer()
357 		tcp_delack_timer_handler(sk);  in tcp_delack_timer()
359 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);  in tcp_delack_timer()
361 		if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))  in tcp_delack_timer()
362 			sock_hold(sk);  in tcp_delack_timer()
364 	bh_unlock_sock(sk);  in tcp_delack_timer()
365 	sock_put(sk);  in tcp_delack_timer()
368 static void tcp_probe_timer(struct sock *sk)  in tcp_probe_timer()  argument
370 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_probe_timer()
371 	struct sk_buff *skb = tcp_send_head(sk);  in tcp_probe_timer()
372 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_probe_timer()
399 	max_probes = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_retries2);  in tcp_probe_timer()
400 	if (sock_flag(sk, SOCK_DEAD)) {  in tcp_probe_timer()
403 		max_probes = tcp_orphan_retries(sk, alive);  in tcp_probe_timer()
406 		if (tcp_out_of_resources(sk, true))  in tcp_probe_timer()
411 abort:		tcp_write_err(sk);  in tcp_probe_timer()
414 		tcp_send_probe0(sk);  in tcp_probe_timer()
422 static void tcp_fastopen_synack_timer(struct sock *sk, struct request_sock *req)  in tcp_fastopen_synack_timer()  argument
424 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_fastopen_synack_timer()
425 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_fastopen_synack_timer()
434 		READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_synack_retries) + 1;  in tcp_fastopen_synack_timer()
437 		tcp_write_err(sk);  in tcp_fastopen_synack_timer()
442 		tcp_enter_loss(sk);  in tcp_fastopen_synack_timer()
448 	inet_rtx_syn_ack(sk, req);  in tcp_fastopen_synack_timer()
453 	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,  in tcp_fastopen_synack_timer()
457 static bool tcp_rtx_probe0_timed_out(const struct sock *sk,  in tcp_rtx_probe0_timed_out()  argument
460 	const struct tcp_sock *tp = tcp_sk(sk);  in tcp_rtx_probe0_timed_out()
464 	rcv_delta = inet_csk(sk)->icsk_timeout - tp->rcv_tstamp;  in tcp_rtx_probe0_timed_out()
485 void tcp_retransmit_timer(struct sock *sk)  in tcp_retransmit_timer()  argument
487 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_retransmit_timer()
488 	struct net *net = sock_net(sk);  in tcp_retransmit_timer()
489 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_retransmit_timer()
494 					lockdep_sock_is_held(sk));  in tcp_retransmit_timer()
496 		WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&  in tcp_retransmit_timer()
497 			     sk->sk_state != TCP_FIN_WAIT1);  in tcp_retransmit_timer()
498 		tcp_fastopen_synack_timer(sk, req);  in tcp_retransmit_timer()
508 	skb = tcp_rtx_queue_head(sk);  in tcp_retransmit_timer()
514 	if (!tp->snd_wnd && !sock_flag(sk, SOCK_DEAD) &&  in tcp_retransmit_timer()
515 	    !((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))) {  in tcp_retransmit_timer()
521 		struct inet_sock *inet = inet_sk(sk);  in tcp_retransmit_timer()
525 		if (sk->sk_family == AF_INET) {  in tcp_retransmit_timer()
533 		else if (sk->sk_family == AF_INET6) {  in tcp_retransmit_timer()
535 				&sk->sk_v6_daddr, ntohs(inet->inet_dport),  in tcp_retransmit_timer()
541 		if (tcp_rtx_probe0_timed_out(sk, skb)) {  in tcp_retransmit_timer()
542 			tcp_write_err(sk);  in tcp_retransmit_timer()
545 		tcp_enter_loss(sk);  in tcp_retransmit_timer()
546 		tcp_retransmit_skb(sk, skb, 1);  in tcp_retransmit_timer()
547 		__sk_dst_reset(sk);  in tcp_retransmit_timer()
551 	__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPTIMEOUTS);  in tcp_retransmit_timer()
552 	if (tcp_write_timeout(sk))  in tcp_retransmit_timer()
573 			__NET_INC_STATS(sock_net(sk), mib_idx);  in tcp_retransmit_timer()
576 	tcp_enter_loss(sk);  in tcp_retransmit_timer()
579 	if (tcp_retransmit_skb(sk, tcp_rtx_queue_head(sk), 1) > 0) {  in tcp_retransmit_timer()
583 		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,  in tcp_retransmit_timer()
616 	if (sk->sk_state == TCP_ESTABLISHED &&  in tcp_retransmit_timer()
622 				       tcp_rto_min(sk),  in tcp_retransmit_timer()
624 	} else if (sk->sk_state != TCP_SYN_SENT ||  in tcp_retransmit_timer()
632 	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,  in tcp_retransmit_timer()
633 				  tcp_clamp_rto_to_user_timeout(sk), TCP_RTO_MAX);  in tcp_retransmit_timer()
634 	if (retransmits_timed_out(sk, READ_ONCE(net->ipv4.sysctl_tcp_retries1) + 1, 0))  in tcp_retransmit_timer()
635 		__sk_dst_reset(sk);  in tcp_retransmit_timer()
642 void tcp_write_timer_handler(struct sock *sk)  in tcp_write_timer_handler()  argument
644 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timer_handler()
647 	if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) ||  in tcp_write_timer_handler()
652 		sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);  in tcp_write_timer_handler()
656 	tcp_mstamp_refresh(tcp_sk(sk));  in tcp_write_timer_handler()
661 		tcp_rack_reo_timeout(sk);  in tcp_write_timer_handler()
664 		tcp_send_loss_probe(sk);  in tcp_write_timer_handler()
668 		tcp_retransmit_timer(sk);  in tcp_write_timer_handler()
672 		tcp_probe_timer(sk);  in tcp_write_timer_handler()
681 	struct sock *sk = &icsk->icsk_inet.sk;  in tcp_write_timer()  local
683 	bh_lock_sock(sk);  in tcp_write_timer()
684 	if (!sock_owned_by_user(sk)) {  in tcp_write_timer()
685 		tcp_write_timer_handler(sk);  in tcp_write_timer()
688 		if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &sk->sk_tsq_flags))  in tcp_write_timer()
689 			sock_hold(sk);  in tcp_write_timer()
691 	bh_unlock_sock(sk);  in tcp_write_timer()
692 	sock_put(sk);  in tcp_write_timer()
703 void tcp_set_keepalive(struct sock *sk, int val)  in tcp_set_keepalive()  argument
705 	if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))  in tcp_set_keepalive()
708 	if (val && !sock_flag(sk, SOCK_KEEPOPEN))  in tcp_set_keepalive()
709 		inet_csk_reset_keepalive_timer(sk, keepalive_time_when(tcp_sk(sk)));  in tcp_set_keepalive()
711 		inet_csk_delete_keepalive_timer(sk);  in tcp_set_keepalive()
718 	struct sock *sk = from_timer(sk, t, sk_timer);  in tcp_keepalive_timer()  local
719 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_keepalive_timer()
720 	struct tcp_sock *tp = tcp_sk(sk);  in tcp_keepalive_timer()
724 	bh_lock_sock(sk);  in tcp_keepalive_timer()
725 	if (sock_owned_by_user(sk)) {  in tcp_keepalive_timer()
727 		inet_csk_reset_keepalive_timer (sk, HZ/20);  in tcp_keepalive_timer()
731 	if (sk->sk_state == TCP_LISTEN) {  in tcp_keepalive_timer()
737 	if (sk->sk_state == TCP_FIN_WAIT2 && sock_flag(sk, SOCK_DEAD)) {  in tcp_keepalive_timer()
739 			const int tmo = tcp_fin_time(sk) - TCP_TIMEWAIT_LEN;  in tcp_keepalive_timer()
742 				tcp_time_wait(sk, TCP_FIN_WAIT2, tmo);  in tcp_keepalive_timer()
746 		tcp_send_active_reset(sk, GFP_ATOMIC);  in tcp_keepalive_timer()
750 	if (!sock_flag(sk, SOCK_KEEPOPEN) ||  in tcp_keepalive_timer()
751 	    ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)))  in tcp_keepalive_timer()
757 	if (tp->packets_out || !tcp_write_queue_empty(sk))  in tcp_keepalive_timer()
773 			tcp_send_active_reset(sk, GFP_ATOMIC);  in tcp_keepalive_timer()
774 			tcp_write_err(sk);  in tcp_keepalive_timer()
777 		if (tcp_write_wakeup(sk, LINUX_MIB_TCPKEEPALIVE) <= 0) {  in tcp_keepalive_timer()
792 	inet_csk_reset_keepalive_timer (sk, elapsed);  in tcp_keepalive_timer()
796 	tcp_done(sk);  in tcp_keepalive_timer()
799 	bh_unlock_sock(sk);  in tcp_keepalive_timer()
800 	sock_put(sk);  in tcp_keepalive_timer()
806 	struct sock *sk = (struct sock *)tp;  in tcp_compressed_ack_kick()  local
808 	bh_lock_sock(sk);  in tcp_compressed_ack_kick()
809 	if (!sock_owned_by_user(sk)) {  in tcp_compressed_ack_kick()
816 			tcp_send_ack(sk);  in tcp_compressed_ack_kick()
820 				      &sk->sk_tsq_flags))  in tcp_compressed_ack_kick()
821 			sock_hold(sk);  in tcp_compressed_ack_kick()
823 	bh_unlock_sock(sk);  in tcp_compressed_ack_kick()
825 	sock_put(sk);  in tcp_compressed_ack_kick()
830 void tcp_init_xmit_timers(struct sock *sk)  in tcp_init_xmit_timers()  argument
832 	inet_csk_init_xmit_timers(sk, &tcp_write_timer, &tcp_delack_timer,  in tcp_init_xmit_timers()
834 	hrtimer_init(&tcp_sk(sk)->pacing_timer, CLOCK_MONOTONIC,  in tcp_init_xmit_timers()
836 	tcp_sk(sk)->pacing_timer.function = tcp_pace_kick;  in tcp_init_xmit_timers()
838 	hrtimer_init(&tcp_sk(sk)->compressed_ack_timer, CLOCK_MONOTONIC,  in tcp_init_xmit_timers()
840 	tcp_sk(sk)->compressed_ack_timer.function = tcp_compressed_ack_kick;  in tcp_init_xmit_timers()