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2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b 
 kernel/include/linux/tcp.h
....@@ -1,3 +1,4 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  * INET		An implementation of the TCP/IP protocol suite for the LINUX
34  *		operating system.  INET is implemented using the  BSD Socket
....@@ -8,11 +9,6 @@
89  * Version:	@(#)tcp.h	1.0.2	04/28/93
910  *
1011  * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11
- *
12
- *		This program is free software; you can redistribute it and/or
13
- *		modify it under the terms of the GNU General Public License
14
- *		as published by the Free Software Foundation; either version
15
- *		2 of the License, or (at your option) any later version.
1612  */
1713 #ifndef _LINUX_TCP_H
1814 #define _LINUX_TCP_H
....@@ -20,6 +16,7 @@
2016 
2117 #include <linux/skbuff.h>
2218 #include <linux/win_minmax.h>
19
+#include <linux/android_kabi.h>
2320 #include <net/sock.h>
2421 #include <net/inet_connection_sock.h>
2522 #include <net/inet_timewait_sock.h>
....@@ -62,12 +59,7 @@
6259 
6360 /* TCP Fast Open Cookie as stored in memory */
6461 struct tcp_fastopen_cookie {
65
-	union {
66
-		u8	val[TCP_FASTOPEN_COOKIE_MAX];
67
-#if IS_ENABLED(CONFIG_IPV6)
68
-		struct in6_addr addr;
69
-#endif
70
-	};
62
+	__le64	val[DIV_ROUND_UP(TCP_FASTOPEN_COOKIE_MAX, sizeof(u64))];
7163 	s8	len;
7264 	bool	exp;	/* In RFC6994 experimental option format */
7365 };
....@@ -101,6 +93,8 @@
10193 		smc_ok : 1,	/* SMC seen on SYN packet		*/
10294 		snd_wscale : 4,	/* Window scaling received from sender	*/
10395 		rcv_wscale : 4;	/* Window scaling to send to receiver	*/
96
+	u8	saw_unknown:1,	/* Received unknown option		*/
97
+		unused:7;
10498 	u8	num_sacks;	/* Number of SACK blocks		*/
10599 	u16	user_mss;	/* mss requested by user in ioctl	*/
106100 	u16	mss_clamp;	/* Maximal mss, negotiated at connection setup */
....@@ -128,6 +122,10 @@
128122 	const struct tcp_request_sock_ops *af_specific;
129123 	u64				snt_synack; /* first SYNACK sent time */
130124 	bool				tfo_listener;
125
+	bool				is_mptcp;
126
+#if IS_ENABLED(CONFIG_MPTCP)
127
+	bool				drop_req;
128
+#endif
131129 	u32				txhash;
132130 	u32				rcv_isn;
133131 	u32				snt_isn;
....@@ -137,6 +135,7 @@
137135 						  * FastOpen it's the seq#
138136 						  * after data-in-SYN.
139137 						  */
138
+	u8				syn_tos;
140139 };
141140 
142141 static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
....@@ -225,8 +224,9 @@
225224 	} rack;
226225 	u16	advmss;		/* Advertised MSS			*/
227226 	u8	compressed_ack;
228
-	u8	tlp_retrans:1,	/* TLP is a retransmission */
229
-		unused_1:7;
227
+	u8	dup_ack_counter:2,
228
+		tlp_retrans:1,	/* TLP is a retransmission */
229
+		unused:5;
230230 	u32	chrono_start;	/* Start time in jiffies of a TCP chrono */
231231 	u32	chrono_stat[3];	/* Time in jiffies for chrono_stat stats */
232232 	u8	chrono_type:2,	/* current chronograph type */
....@@ -234,22 +234,25 @@
234234 		fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */
235235 		fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */
236236 		is_sack_reneg:1,    /* in recovery from loss with SACK reneg? */
237
-		unused:2;
237
+		fastopen_client_fail:2; /* reason why fastopen failed */
238238 	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
239239 		thin_lto    : 1,/* Use linear timeouts for thin streams */
240240 		recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */
241241 		repair      : 1,
242242 		frto        : 1;/* F-RTO (RFC5682) activated in CA_Loss */
243243 	u8	repair_queue;
244
-	u8	syn_data:1,	/* SYN includes data */
244
+	u8	save_syn:2,	/* Save headers of SYN packet */
245
+		syn_data:1,	/* SYN includes data */
245246 		syn_fastopen:1,	/* SYN includes Fast Open option */
246247 		syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
247248 		syn_fastopen_ch:1, /* Active TFO re-enabling probe */
248249 		syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
249
-		save_syn:1,	/* Save headers of SYN packet */
250
-		is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */
251
-		syn_smc:1;	/* SYN includes SMC */
250
+		is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */
252251 	u32	tlp_high_seq;	/* snd_nxt at the time of TLP */
252
+
253
+	u32	tcp_tx_delay;	/* delay (in usec) added to TX packets */
254
+	u64	tcp_wstamp_ns;	/* departure time for next sent data packet */
255
+	u64	tcp_clock_cache; /* cache last tcp_clock_ns() (see tcp_mstamp_refresh()) */
253256 
254257 /* RTT measurement */
255258 	u64	tcp_mstamp;	/* most recent packet received/sent */
....@@ -263,7 +266,14 @@
263266 	u32	packets_out;	/* Packets which are "in flight"	*/
264267 	u32	retrans_out;	/* Retransmitted packets out		*/
265268 	u32	max_packets_out;  /* max packets_out in last window */
269
+/* GENKSYMS hack to preserve the ABI because of f4ce91ce12a7 ("tcp: fix
270
+ * tcp_cwnd_validate() to not forget is_cwnd_limited")
271
+ */
272
+#ifndef __GENKSYMS__
273
+	u32	cwnd_usage_seq;  /* right edge of cwnd usage tracking flight */
274
+#else
266275 	u32	max_packets_seq;  /* right edge of max_packets_out flight */
276
+#endif
267277 
268278 	u16	urg_data;	/* Saved octet of OOB data and control flags */
269279 	u8	ecn_flags;	/* ECN status bits.			*/
....@@ -361,6 +371,10 @@
361371 #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0
362372 #endif
363373 
374
+	u16 timeout_rehash;	/* Timeout-triggered rehash attempts */
375
+
376
+	u32 rcv_ooopack; /* Received out-of-order packets, for tcpinfo */
377
+
364378 /* Receiver side RTT estimation */
365379 	u32 rcv_rtt_last_tsecr;
366380 	struct {
....@@ -384,6 +398,12 @@
384398 	u32	mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG
385399 			   * while socket was owned by user.
386400 			   */
401
+#if IS_ENABLED(CONFIG_MPTCP)
402
+	bool	is_mptcp;
403
+#endif
404
+#if IS_ENABLED(CONFIG_SMC)
405
+	bool	syn_smc;	/* SYN includes SMC */
406
+#endif
387407 
388408 #ifdef CONFIG_TCP_MD5SIG
389409 /* TCP AF-Specific parts; only used by MD5 Signature support so far */
....@@ -398,8 +418,10 @@
398418 	/* fastopen_rsk points to request_sock that resulted in this big
399419 	 * socket. Used to retransmit SYNACKs etc.
400420 	 */
401
-	struct request_sock *fastopen_rsk;
402
-	u32	*saved_syn;
421
+	struct request_sock __rcu *fastopen_rsk;
422
+	struct saved_syn *saved_syn;
423
+
424
+	ANDROID_KABI_RESERVE(1);
403425 };
404426 
405427 enum tsq_enum {
....@@ -439,6 +461,7 @@
439461 	u32			  tw_last_oow_ack_time;
440462 
441463 	int			  tw_ts_recent_stamp;
464
+	u32			  tw_tx_delay;
442465 #ifdef CONFIG_TCP_MD5SIG
443466 	struct tcp_md5sig_key	  *tw_md5_key;
444467 #endif
....@@ -451,8 +474,8 @@
451474 
452475 static inline bool tcp_passive_fastopen(const struct sock *sk)
453476 {
454
-	return (sk->sk_state == TCP_SYN_RECV &&
455
-		tcp_sk(sk)->fastopen_rsk != NULL);
477
+	return sk->sk_state == TCP_SYN_RECV &&
478
+	       rcu_access_pointer(tcp_sk(sk)->fastopen_rsk) != NULL;
456479 }
457480 
458481 static inline void fastopen_queue_tune(struct sock *sk, int backlog)
....@@ -460,7 +483,7 @@
460483 	struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
461484 	int somaxconn = READ_ONCE(sock_net(sk)->core.sysctl_somaxconn);
462485 
463
-	queue->fastopenq.max_qlen = min_t(unsigned int, backlog, somaxconn);
486
+	WRITE_ONCE(queue->fastopenq.max_qlen, min_t(unsigned int, backlog, somaxconn));
464487 }
465488 
466489 static inline void tcp_move_syn(struct tcp_sock *tp,
....@@ -476,7 +499,14 @@
476499 	tp->saved_syn = NULL;
477500 }
478501 
479
-struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk);
502
+static inline u32 tcp_saved_syn_len(const struct saved_syn *saved_syn)
503
+{
504
+	return saved_syn->mac_hdrlen + saved_syn->network_hdrlen +
505
+		saved_syn->tcp_hdrlen;
506
+}
507
+
508
+struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
509
+					       const struct sk_buff *orig_skb);
480510 
481511 static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss)
482512 {
....@@ -491,4 +521,14 @@
491521 int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount,
492522 		  int shiftlen);
493523 
524
+void tcp_sock_set_cork(struct sock *sk, bool on);
525
+int tcp_sock_set_keepcnt(struct sock *sk, int val);
526
+int tcp_sock_set_keepidle_locked(struct sock *sk, int val);
527
+int tcp_sock_set_keepidle(struct sock *sk, int val);
528
+int tcp_sock_set_keepintvl(struct sock *sk, int val);
529
+void tcp_sock_set_nodelay(struct sock *sk);
530
+void tcp_sock_set_quickack(struct sock *sk, int val);
531
+int tcp_sock_set_syncnt(struct sock *sk, int val);
532
+void tcp_sock_set_user_timeout(struct sock *sk, u32 val);
533
+
494534 #endif	/* _LINUX_TCP_H */