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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/net/ipv4/tcp_minisocks.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * INET		An implementation of the TCP/IP protocol suite for the LINUX
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  *		operating system.  INET is implemented using the  BSD Socket
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@@ -179,7 +180,7 @@
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 			 * Oh well... nobody has a sufficient solution to this
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 			 * protocol bug yet.
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 			 */
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-			if (twsk_net(tw)->ipv4.sysctl_tcp_rfc1337 == 0) {
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+			if (!READ_ONCE(twsk_net(tw)->ipv4.sysctl_tcp_rfc1337)) {
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 kill:
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 				inet_twsk_deschedule_put(tw);
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 				return TCP_TW_SUCCESS;
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@@ -265,6 +266,7 @@
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266
 
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 		tw->tw_transparent	= inet->transparent;
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 		tw->tw_mark		= sk->sk_mark;
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+		tw->tw_priority		= sk->sk_priority;
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 		tw->tw_rcv_wscale	= tp->rx_opt.rcv_wscale;
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 		tcptw->tw_rcv_nxt	= tp->rcv_nxt;
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 		tcptw->tw_snd_nxt	= tp->snd_nxt;
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@@ -273,7 +275,7 @@
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 		tcptw->tw_ts_recent_stamp = tp->rx_opt.ts_recent_stamp;
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 		tcptw->tw_ts_offset	= tp->tsoffset;
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 		tcptw->tw_last_oow_ack_time = 0;
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-
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+		tcptw->tw_tx_delay	= tp->tcp_tx_delay;
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 #if IS_ENABLED(CONFIG_IPV6)
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 		if (tw->tw_family == PF_INET6) {
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 			struct ipv6_pinfo *np = inet6_sk(sk);
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@@ -282,6 +284,7 @@
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 			tw->tw_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
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 			tw->tw_tclass = np->tclass;
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 			tw->tw_flowlabel = be32_to_cpu(np->flow_label & IPV6_FLOWLABEL_MASK);
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+			tw->tw_txhash = sk->sk_txhash;
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 			tw->tw_ipv6only = sk->sk_ipv6only;
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 		}
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 #endif
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@@ -294,12 +297,15 @@
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 		 * so the timewait ack generating code has the key.
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 		 */
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 		do {
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-			struct tcp_md5sig_key *key;
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 			tcptw->tw_md5_key = NULL;
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-			key = tp->af_specific->md5_lookup(sk, sk);
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-			if (key) {
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-				tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC);
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-				BUG_ON(tcptw->tw_md5_key && !tcp_alloc_md5sig_pool());
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+			if (static_branch_unlikely(&tcp_md5_needed)) {
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+				struct tcp_md5sig_key *key;
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+
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+				key = tp->af_specific->md5_lookup(sk, sk);
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+				if (key) {
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+					tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC);
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+					BUG_ON(tcptw->tw_md5_key && !tcp_alloc_md5sig_pool());
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+				}
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 			}
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 		} while (0);
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 #endif
..
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@@ -338,10 +344,12 @@
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 void tcp_twsk_destructor(struct sock *sk)
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 {
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 #ifdef CONFIG_TCP_MD5SIG
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-	struct tcp_timewait_sock *twsk = tcp_twsk(sk);
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+	if (static_branch_unlikely(&tcp_md5_needed)) {
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+		struct tcp_timewait_sock *twsk = tcp_twsk(sk);
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349
 
343
-	if (twsk->tw_md5_key)
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-		kfree_rcu(twsk->tw_md5_key, rcu);
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+		if (twsk->tw_md5_key)
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+			kfree_rcu(twsk->tw_md5_key, rcu);
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+	}
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353
 #endif
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354
 }
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355
 EXPORT_SYMBOL_GPL(tcp_twsk_destructor);
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@@ -406,7 +414,7 @@
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414
 
407
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 		rcu_read_lock();
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 		ca = tcp_ca_find_key(ca_key);
409
-		if (likely(ca && try_module_get(ca->owner))) {
417
+		if (likely(ca && bpf_try_module_get(ca, ca->owner))) {
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418
 			icsk->icsk_ca_dst_locked = tcp_ca_dst_locked(dst);
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419
 			icsk->icsk_ca_ops = ca;
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420
 			ca_got_dst = true;
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@@ -417,7 +425,7 @@
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 	/* If no valid choice made yet, assign current system default ca. */
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426
 	if (!ca_got_dst &&
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427
 	    (!icsk->icsk_ca_setsockopt ||
420
-	     !try_module_get(icsk->icsk_ca_ops->owner)))
428
+	     !bpf_try_module_get(icsk->icsk_ca_ops, icsk->icsk_ca_ops->owner)))
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429
 		tcp_assign_congestion_control(sk);
422
430
 
423
431
 	tcp_set_ca_state(sk, TCP_CA_Open);
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@@ -474,50 +482,25 @@
474
482
 	WRITE_ONCE(newtp->rcv_nxt, seq);
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483
 	newtp->segs_in = 1;
476
484
 
477
-	newtp->snd_sml = newtp->snd_una =
478
-	newtp->snd_nxt = newtp->snd_up = treq->snt_isn + 1;
485
+	seq = treq->snt_isn + 1;
486
+	newtp->snd_sml = newtp->snd_una = seq;
487
+	WRITE_ONCE(newtp->snd_nxt, seq);
488
+	newtp->snd_up = seq;
479
489
 
480
490
 	INIT_LIST_HEAD(&newtp->tsq_node);
481
491
 	INIT_LIST_HEAD(&newtp->tsorted_sent_queue);
482
492
 
483
493
 	tcp_init_wl(newtp, treq->rcv_isn);
484
494
 
485
-	newtp->srtt_us = 0;
486
-	newtp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT);
487
495
 	minmax_reset(&newtp->rtt_min, tcp_jiffies32, ~0U);
488
-	newicsk->icsk_rto = TCP_TIMEOUT_INIT;
489
496
 	newicsk->icsk_ack.lrcvtime = tcp_jiffies32;
490
497
 
491
-	newtp->packets_out = 0;
492
-	newtp->retrans_out = 0;
493
-	newtp->sacked_out = 0;
494
-	newtp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
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-	newtp->tlp_high_seq = 0;
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498
 	newtp->lsndtime = tcp_jiffies32;
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499
 	newsk->sk_txhash = treq->txhash;
498
-	newtp->last_oow_ack_time = 0;
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500
 	newtp->total_retrans = req->num_retrans;
500
-
501
-	/* So many TCP implementations out there (incorrectly) count the
502
-	 * initial SYN frame in their delayed-ACK and congestion control
503
-	 * algorithms that we must have the following bandaid to talk
504
-	 * efficiently to them.  -DaveM
505
-	 */
506
-	newtp->snd_cwnd = TCP_INIT_CWND;
507
-	newtp->snd_cwnd_cnt = 0;
508
-
509
-	/* There's a bubble in the pipe until at least the first ACK. */
510
-	newtp->app_limited = ~0U;
511
501
 
512
502
 	tcp_init_xmit_timers(newsk);
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503
 	WRITE_ONCE(newtp->write_seq, newtp->pushed_seq = treq->snt_isn + 1);
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-
515
-	newtp->rx_opt.saw_tstamp = 0;
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-
517
-	newtp->rx_opt.dsack = 0;
518
-	newtp->rx_opt.num_sacks = 0;
519
-
520
-	newtp->urg_data = 0;
521
504
 
522
505
 	if (sock_flag(newsk, SOCK_KEEPOPEN))
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506
 		inet_csk_reset_keepalive_timer(newsk,
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@@ -547,10 +530,15 @@
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 		newtp->rx_opt.ts_recent_stamp = 0;
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531
 		newtp->tcp_header_len = sizeof(struct tcphdr);
549
532
 	}
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+	if (req->num_timeout) {
534
+		newtp->undo_marker = treq->snt_isn;
535
+		newtp->retrans_stamp = div_u64(treq->snt_synack,
536
+					       USEC_PER_SEC / TCP_TS_HZ);
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+	}
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538
 	newtp->tsoffset = treq->ts_off;
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539
 #ifdef CONFIG_TCP_MD5SIG
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540
 	newtp->md5sig_info = NULL;	/*XXX*/
553
-	if (newtp->af_specific->md5_lookup(sk, newsk))
541
+	if (treq->af_specific->req_md5_lookup(sk, req_to_sk(req)))
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542
 		newtp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
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543
 #endif
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 	if (skb->len >= TCP_MSS_DEFAULT + newtp->tcp_header_len)
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@@ -558,14 +546,9 @@
558
546
 	newtp->rx_opt.mss_clamp = req->mss;
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547
 	tcp_ecn_openreq_child(newtp, req);
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548
 	newtp->fastopen_req = NULL;
561
-	newtp->fastopen_rsk = NULL;
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-	newtp->syn_data_acked = 0;
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-	newtp->rack.mstamp = 0;
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-	newtp->rack.advanced = 0;
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-	newtp->rack.reo_wnd_steps = 1;
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-	newtp->rack.last_delivered = 0;
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-	newtp->rack.reo_wnd_persist = 0;
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-	newtp->rack.dsack_seen = 0;
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+	RCU_INIT_POINTER(newtp->fastopen_rsk, NULL);
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+
551
+	tcp_bpf_clone(sk, newsk);
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552
 
570
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 	__TCP_INC_STATS(sock_net(sk), TCP_MIB_PASSIVEOPENS);
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554
 
..
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@@ -791,6 +774,12 @@
791
774
 	if (!child)
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 		goto listen_overflow;
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776
 
777
+	if (own_req && rsk_drop_req(req)) {
778
+		reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
779
+		inet_csk_reqsk_queue_drop_and_put(sk, req);
780
+		return child;
781
+	}
782
+
794
783
 	sock_rps_save_rxhash(child, skb);
795
784
 	tcp_synack_rtt_meas(child, req);
796
785
 	*req_stolen = !own_req;
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@@ -839,6 +828,7 @@
839
828
 
840
829
 int tcp_child_process(struct sock *parent, struct sock *child,
841
830
 		      struct sk_buff *skb)
831
+	__releases(&((child)->sk_lock.slock))
842
832
 {
843
833
 	int ret = 0;
844
834
 	int state = child->sk_state;