xref: /linux/net/rxrpc/ar-internal.h (revision bc9ff192a6c940d9a26e21a0a82f2667067aaf5f)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* AF_RXRPC internal definitions
3  *
4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7 
8 #include <linux/atomic.h>
9 #include <linux/seqlock.h>
10 #include <linux/win_minmax.h>
11 #include <net/net_namespace.h>
12 #include <net/netns/generic.h>
13 #include <net/sock.h>
14 #include <net/af_rxrpc.h>
15 #include <keys/rxrpc-type.h>
16 #include "protocol.h"
17 
18 #define FCRYPT_BSIZE 8
19 struct rxrpc_crypt {
20 	union {
21 		u8	x[FCRYPT_BSIZE];
22 		__be32	n[2];
23 	};
24 } __attribute__((aligned(8)));
25 
26 #define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
27 #define rxrpc_queue_delayed_work(WS,D)	\
28 	queue_delayed_work(rxrpc_workqueue, (WS), (D))
29 
30 struct key_preparsed_payload;
31 struct rxrpc_connection;
32 struct rxrpc_txbuf;
33 struct rxrpc_txqueue;
34 struct rxgk_context;
35 
36 /*
37  * Mark applied to socket buffers in skb->mark.  skb->priority is used
38  * to pass supplementary information.
39  */
40 enum rxrpc_skb_mark {
41 	RXRPC_SKB_MARK_PACKET,		/* Received packet */
42 	RXRPC_SKB_MARK_ERROR,		/* Error notification */
43 	RXRPC_SKB_MARK_CHALLENGE,	/* Challenge notification */
44 	RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */
45 	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
46 	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
47 };
48 
49 /*
50  * sk_state for RxRPC sockets
51  */
52 enum {
53 	RXRPC_UNBOUND = 0,
54 	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
55 	RXRPC_CLIENT_BOUND,		/* client local address bound */
56 	RXRPC_SERVER_BOUND,		/* server local address bound */
57 	RXRPC_SERVER_BOUND2,		/* second server local address bound */
58 	RXRPC_SERVER_LISTENING,		/* server listening for connections */
59 	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
60 	RXRPC_CLOSE,			/* socket is being closed */
61 };
62 
63 /*
64  * Per-network namespace data.
65  */
66 struct rxrpc_net {
67 	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
68 	u32			epoch;		/* Local epoch for detecting local-end reset */
69 	struct list_head	calls;		/* List of calls active in this namespace */
70 	spinlock_t		call_lock;	/* Lock for ->calls */
71 	atomic_t		nr_calls;	/* Count of allocated calls */
72 
73 	atomic_t		nr_conns;
74 	struct list_head	bundle_proc_list; /* List of bundles for proc */
75 	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
76 	struct list_head	service_conns;	/* Service conns in this namespace */
77 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
78 	struct work_struct	service_conn_reaper;
79 	struct timer_list	service_conn_reap_timer;
80 
81 	bool			live;
82 
83 	atomic_t		nr_client_conns;
84 
85 	struct hlist_head	local_endpoints;
86 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
87 
88 	DECLARE_HASHTABLE	(peer_hash, 10);
89 	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
90 
91 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
92 	u8			peer_keepalive_cursor;
93 	time64_t		peer_keepalive_base;
94 	struct list_head	peer_keepalive[32];
95 	struct list_head	peer_keepalive_new;
96 	struct timer_list	peer_keepalive_timer;
97 	struct work_struct	peer_keepalive_work;
98 
99 	atomic_t		stat_tx_data;
100 	atomic_t		stat_tx_data_retrans;
101 	atomic_t		stat_tx_data_send;
102 	atomic_t		stat_tx_data_send_frag;
103 	atomic_t		stat_tx_data_send_fail;
104 	atomic_t		stat_tx_data_send_msgsize;
105 	atomic_t		stat_tx_data_underflow;
106 	atomic_t		stat_tx_data_cwnd_reset;
107 	atomic_t		stat_rx_data;
108 	atomic_t		stat_rx_data_reqack;
109 	atomic_t		stat_rx_data_jumbo;
110 
111 	atomic_t		stat_tx_ack_fill;
112 	atomic_t		stat_tx_ack_send;
113 	atomic_t		stat_tx_ack_skip;
114 	atomic_t		stat_tx_acks[256];
115 	atomic_t		stat_rx_acks[256];
116 	atomic_t		stat_tx_jumbo[10];
117 	atomic_t		stat_rx_jumbo[10];
118 
119 	atomic_t		stat_why_req_ack[8];
120 
121 	atomic_t		stat_io_loop;
122 };
123 
124 /*
125  * Service backlog preallocation.
126  *
127  * This contains circular buffers of preallocated peers, connections and calls
128  * for incoming service calls and their head and tail pointers.  This allows
129  * calls to be set up in the data_ready handler, thereby avoiding the need to
130  * shuffle packets around so much.
131  */
132 struct rxrpc_backlog {
133 	unsigned short		peer_backlog_head;
134 	unsigned short		peer_backlog_tail;
135 	unsigned short		conn_backlog_head;
136 	unsigned short		conn_backlog_tail;
137 	unsigned short		call_backlog_head;
138 	unsigned short		call_backlog_tail;
139 #define RXRPC_BACKLOG_MAX	32
140 	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
141 	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
142 	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
143 };
144 
145 /*
146  * RxRPC socket definition
147  */
148 struct rxrpc_sock {
149 	/* WARNING: sk has to be the first member */
150 	struct sock		sk;
151 	const struct rxrpc_kernel_ops *app_ops;	/* Table of kernel app notification funcs */
152 	struct rxrpc_local	*local;		/* local endpoint */
153 	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
154 	struct sk_buff_head	recvmsg_oobq;	/* OOB messages for recvmsg to pick up */
155 	struct rb_root		pending_oobq;	/* OOB messages awaiting userspace to respond to */
156 	u64			oob_id_counter;	/* OOB message ID counter */
157 	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
158 	struct list_head	sock_calls;	/* List of calls owned by this socket */
159 	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
160 	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
161 	spinlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
162 	struct key		*key;		/* security for this socket */
163 	struct key		*securities;	/* list of server security descriptors */
164 	struct rb_root		calls;		/* User ID -> call mapping */
165 	unsigned long		flags;
166 #define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
167 #define RXRPC_SOCK_MANAGE_RESPONSE	1	/* User wants to manage RESPONSE packets */
168 	rwlock_t		call_lock;	/* lock for calls */
169 	u32			min_sec_level;	/* minimum security level */
170 #define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
171 	bool			exclusive;	/* Exclusive connection for a client socket */
172 	u16			second_service;	/* Additional service bound to the endpoint */
173 	struct {
174 		/* Service upgrade information */
175 		u16		from;		/* Service ID to upgrade (if not 0) */
176 		u16		to;		/* service ID to upgrade to */
177 	} service_upgrade;
178 	sa_family_t		family;		/* Protocol family created with */
179 	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
180 	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
181 };
182 
183 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
184 
185 /*
186  * CPU-byteorder normalised Rx packet header.
187  */
188 struct rxrpc_host_header {
189 	u32		epoch;		/* client boot timestamp */
190 	u32		cid;		/* connection and channel ID */
191 	u32		callNumber;	/* call ID (0 for connection-level packets) */
192 	u32		seq;		/* sequence number of pkt in call stream */
193 	u32		serial;		/* serial number of pkt sent to network */
194 	u8		type;		/* packet type */
195 	u8		flags;		/* packet flags */
196 	u8		userStatus;	/* app-layer defined status */
197 	u8		securityIndex;	/* security protocol ID */
198 	union {
199 		u16	_rsvd;		/* reserved */
200 		u16	cksum;		/* kerberos security checksum */
201 	};
202 	u16		serviceId;	/* service ID */
203 } __packed;
204 
205 /*
206  * RxRPC socket buffer private variables
207  * - max 48 bytes (struct sk_buff::cb)
208  */
209 struct rxrpc_skb_priv {
210 	union {
211 		struct rxrpc_connection *poke_conn;	/* Conn referred to (poke packet) */
212 		struct {
213 			u16		offset;		/* Offset of data */
214 			u16		len;		/* Length of data */
215 			u8		flags;
216 #define RXRPC_RX_VERIFIED	0x01
217 		};
218 		struct {
219 			rxrpc_seq_t	first_ack;	/* First packet in acks table */
220 			rxrpc_seq_t	prev_ack;	/* Highest seq seen */
221 			rxrpc_serial_t	acked_serial;	/* Packet in response to (or 0) */
222 			u16		nr_acks;	/* Number of acks+nacks */
223 			u8		reason;		/* Reason for ack */
224 		} ack;
225 		struct {
226 			struct rxrpc_connection *conn;	/* Connection referred to */
227 			union {
228 				u32 rxkad_nonce;
229 			};
230 		} chall;
231 		struct {
232 			rxrpc_serial_t	challenge_serial;
233 			u32		kvno;
234 			u32		version;
235 			u16		len;
236 			u16		ticket_len;
237 		} resp;
238 	};
239 	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
240 };
241 
242 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
243 
244 /*
245  * RxRPC security module interface
246  */
247 struct rxrpc_security {
248 	const char		*name;		/* name of this service */
249 	u8			security_index;	/* security type provided */
250 	u32			no_key_abort;	/* Abort code indicating no key */
251 
252 	/* Initialise a security service */
253 	int (*init)(void);
254 
255 	/* Clean up a security service */
256 	void (*exit)(void);
257 
258 	/* Parse the information from a server key */
259 	int (*preparse_server_key)(struct key_preparsed_payload *);
260 
261 	/* Clean up the preparse buffer after parsing a server key */
262 	void (*free_preparse_server_key)(struct key_preparsed_payload *);
263 
264 	/* Destroy the payload of a server key */
265 	void (*destroy_server_key)(struct key *);
266 
267 	/* Describe a server key */
268 	void (*describe_server_key)(const struct key *, struct seq_file *);
269 
270 	/* initialise a connection's security */
271 	int (*init_connection_security)(struct rxrpc_connection *,
272 					struct rxrpc_key_token *);
273 
274 	/* Work out how much data we can store in a packet, given an estimate
275 	 * of the amount of data remaining and allocate a data buffer.
276 	 */
277 	struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp);
278 
279 	/* impose security on a packet */
280 	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
281 
282 	/* verify the security on a received packet */
283 	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
284 
285 	/* Free crypto request on a call */
286 	void (*free_call_crypto)(struct rxrpc_call *);
287 
288 	/* issue a challenge */
289 	int (*issue_challenge)(struct rxrpc_connection *);
290 
291 	/* Validate a challenge packet */
292 	bool (*validate_challenge)(struct rxrpc_connection *conn,
293 				   struct sk_buff *skb);
294 
295 	/* Fill out the cmsg for recvmsg() to pass on a challenge to userspace.
296 	 * The security class gets to add additional information.
297 	 */
298 	int (*challenge_to_recvmsg)(struct rxrpc_connection *conn,
299 				    struct sk_buff *challenge,
300 				    struct msghdr *msg);
301 
302 	/* Parse sendmsg() control message and respond to challenge. */
303 	int (*sendmsg_respond_to_challenge)(struct sk_buff *challenge,
304 					    struct msghdr *msg);
305 
306 	/* respond to a challenge */
307 	int (*respond_to_challenge)(struct rxrpc_connection *conn,
308 				    struct sk_buff *challenge);
309 
310 	/* verify a response */
311 	int (*verify_response)(struct rxrpc_connection *,
312 			       struct sk_buff *);
313 
314 	/* clear connection security */
315 	void (*clear)(struct rxrpc_connection *);
316 
317 	/* Default ticket -> key decoder */
318 	int (*default_decode_ticket)(struct rxrpc_connection *conn, struct sk_buff *skb,
319 				     unsigned int ticket_offset, unsigned int ticket_len,
320 				     struct key **_key);
321 };
322 
323 /*
324  * RxRPC local transport endpoint description
325  * - owned by a single AF_RXRPC socket
326  * - pointed to by transport socket struct sk_user_data
327  */
328 struct rxrpc_local {
329 	struct rcu_head		rcu;
330 	atomic_t		active_users;	/* Number of users of the local endpoint */
331 	refcount_t		ref;		/* Number of references to the structure */
332 	struct net		*net;		/* The network namespace */
333 	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
334 	struct hlist_node	link;
335 	struct socket		*socket;	/* my UDP socket */
336 	struct task_struct	*io_thread;
337 	struct completion	io_thread_ready; /* Indication that the I/O thread started */
338 	struct page_frag_cache	tx_alloc;	/* Tx control packet allocation (I/O thread only) */
339 	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
340 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
341 	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
342 #endif
343 	struct sk_buff_head	rx_queue;	/* Received packets */
344 	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
345 	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
346 
347 	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
348 	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
349 	bool			kill_all_client_conns;
350 	struct list_head	idle_client_conns;
351 	struct timer_list	client_conn_reap_timer;
352 	unsigned long		client_conn_flags;
353 #define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
354 
355 	spinlock_t		lock;		/* access lock */
356 	rwlock_t		services_lock;	/* lock for services list */
357 	int			debug_id;	/* debug ID for printks */
358 	bool			dead;
359 	bool			service_closed;	/* Service socket closed */
360 	struct idr		conn_ids;	/* List of connection IDs */
361 	struct list_head	new_client_calls; /* Newly created client calls need connection */
362 	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
363 	struct sockaddr_rxrpc	srx;		/* local address */
364 	union {
365 		/* Provide a kvec table sufficiently large to manage either a
366 		 * DATA packet with a maximum set of jumbo subpackets or a PING
367 		 * ACK padded out to 64K with zeropages for PMTUD.
368 		 */
369 		struct kvec		kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ?
370 					     1 + RXRPC_MAX_NR_JUMBO : 3 + 16];
371 		struct bio_vec		bvec[3 + 16];
372 	};
373 };
374 
375 /*
376  * RxRPC remote transport endpoint definition
377  * - matched by local endpoint, remote port, address and protocol type
378  */
379 struct rxrpc_peer {
380 	struct rcu_head		rcu;		/* This must be first */
381 	refcount_t		ref;
382 	unsigned long		hash_key;
383 	struct hlist_node	hash_link;
384 	struct rxrpc_local	*local;
385 	struct hlist_head	error_targets;	/* targets for net error distribution */
386 	struct rb_root		service_conns;	/* Service connections */
387 	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
388 	unsigned long		app_data;	/* Application data (e.g. afs_server) */
389 	time64_t		last_tx_at;	/* Last time packet sent here */
390 	seqlock_t		service_conn_lock;
391 	spinlock_t		lock;		/* access lock */
392 	int			debug_id;	/* debug ID for printks */
393 	struct sockaddr_rxrpc	srx;		/* remote address */
394 
395 	/* Path MTU discovery [RFC8899] */
396 	unsigned int		pmtud_trial;	/* Current MTU probe size */
397 	unsigned int		pmtud_good;	/* Largest working MTU probe we've tried */
398 	unsigned int		pmtud_bad;	/* Smallest non-working MTU probe we've tried */
399 	bool			pmtud_lost;	/* T if MTU probe was lost */
400 	bool			pmtud_probing;	/* T if we have an active probe outstanding */
401 	bool			pmtud_pending;	/* T if a call to this peer should send a probe */
402 	u8			pmtud_jumbo;	/* Max jumbo packets for the MTU */
403 	bool			ackr_adv_pmtud;	/* T if the peer advertises path-MTU */
404 	unsigned int		ackr_max_data;	/* Maximum data advertised by peer */
405 	unsigned int		if_mtu;		/* Local interface MTU (- hdrsize) for this peer */
406 	unsigned int		max_data;	/* Maximum packet data capacity for this peer */
407 	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
408 	unsigned short		tx_seg_max;	/* Maximum number of transmissable segments */
409 
410 	/* Calculated RTT cache */
411 	unsigned int		recent_srtt_us;
412 	unsigned int		recent_rto_us;
413 
414 	u8			cong_ssthresh;	/* Congestion slow-start threshold */
415 };
416 
417 /*
418  * Keys for matching a connection.
419  */
420 struct rxrpc_conn_proto {
421 	union {
422 		struct {
423 			u32	epoch;		/* epoch of this connection */
424 			u32	cid;		/* connection ID */
425 		};
426 		u64		index_key;
427 	};
428 };
429 
430 struct rxrpc_conn_parameters {
431 	struct rxrpc_local	*local;		/* Representation of local endpoint */
432 	struct rxrpc_peer	*peer;		/* Representation of remote endpoint */
433 	struct key		*key;		/* Security details */
434 	bool			exclusive;	/* T if conn is exclusive */
435 	bool			upgrade;	/* T if service ID can be upgraded */
436 	u16			service_id;	/* Service ID for this connection */
437 	u32			security_level;	/* Security level selected */
438 };
439 
440 /*
441  * Call completion condition (state == RXRPC_CALL_COMPLETE).
442  */
443 enum rxrpc_call_completion {
444 	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
445 	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
446 	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
447 	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
448 	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
449 	NR__RXRPC_CALL_COMPLETIONS
450 };
451 
452 /*
453  * Bits in the connection flags.
454  */
455 enum rxrpc_conn_flag {
456 	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
457 	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
458 	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
459 	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
460 	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
461 	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
462 	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
463 };
464 
465 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
466 				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
467 				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
468 				   (1UL << RXRPC_CONN_FINAL_ACK_3))
469 
470 /*
471  * Events that can be raised upon a connection.
472  */
473 enum rxrpc_conn_event {
474 	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
475 	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
476 };
477 
478 /*
479  * The connection protocol state.
480  */
481 enum rxrpc_conn_proto_state {
482 	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
483 	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
484 	RXRPC_CONN_CLIENT,		/* Client connection */
485 	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
486 	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
487 	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
488 	RXRPC_CONN_SERVICE,		/* Service secured connection */
489 	RXRPC_CONN_ABORTED,		/* Conn aborted */
490 	RXRPC_CONN__NR_STATES
491 };
492 
493 /*
494  * RxRPC client connection bundle.
495  */
496 struct rxrpc_bundle {
497 	struct rxrpc_local	*local;		/* Representation of local endpoint */
498 	struct rxrpc_peer	*peer;		/* Remote endpoint */
499 	struct key		*key;		/* Security details */
500 	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
501 	const struct rxrpc_security *security;	/* applied security module */
502 	refcount_t		ref;
503 	atomic_t		active;		/* Number of active users */
504 	unsigned int		debug_id;
505 	u32			security_level;	/* Security level selected */
506 	u16			service_id;	/* Service ID for this connection */
507 	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
508 	bool			exclusive;	/* T if conn is exclusive */
509 	bool			upgrade;	/* T if service ID can be upgraded */
510 	unsigned short		alloc_error;	/* Error from last conn allocation */
511 	struct rb_node		local_node;	/* Node in local->client_conns */
512 	struct list_head	waiting_calls;	/* Calls waiting for channels */
513 	unsigned long		avail_chans;	/* Mask of available channels */
514 	unsigned int		conn_ids[4];	/* Connection IDs. */
515 	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
516 };
517 
518 /*
519  * RxRPC connection definition
520  * - matched by { local, peer, epoch, conn_id, direction }
521  * - each connection can only handle four simultaneous calls
522  */
523 struct rxrpc_connection {
524 	struct rxrpc_conn_proto	proto;
525 	struct rxrpc_local	*local;		/* Representation of local endpoint */
526 	struct rxrpc_peer	*peer;		/* Remote endpoint */
527 	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
528 	struct key		*key;		/* Security details */
529 	struct list_head	attend_link;	/* Link in local->conn_attend_q */
530 
531 	refcount_t		ref;
532 	atomic_t		active;		/* Active count for service conns */
533 	struct rcu_head		rcu;
534 	struct list_head	cache_link;
535 
536 	unsigned char		act_chans;	/* Mask of active channels */
537 	struct rxrpc_channel {
538 		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
539 		struct rxrpc_call	*call;		/* Active call */
540 		unsigned int		call_debug_id;	/* call->debug_id */
541 		u32			call_id;	/* ID of current call */
542 		u32			call_counter;	/* Call ID counter */
543 		u32			last_call;	/* ID of last call */
544 		u8			last_type;	/* Type of last packet */
545 		union {
546 			u32		last_seq;
547 			u32		last_abort;
548 		};
549 	} channels[RXRPC_MAXCALLS];
550 
551 	struct timer_list	timer;		/* Conn event timer */
552 	struct work_struct	processor;	/* connection event processor */
553 	struct work_struct	destructor;	/* In-process-context destroyer */
554 	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
555 	struct rb_node		service_node;	/* Node in peer->service_conns */
556 	struct list_head	proc_link;	/* link in procfs list */
557 	struct list_head	link;		/* link in master connection list */
558 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
559 	struct page_frag_cache	tx_data_alloc;	/* Tx DATA packet allocation */
560 	struct mutex		tx_data_alloc_lock;
561 
562 	struct mutex		security_lock;	/* Lock for security management */
563 	const struct rxrpc_security *security;	/* applied security module */
564 	union {
565 		struct {
566 			struct crypto_sync_skcipher *cipher;	/* encryption handle */
567 			struct rxrpc_crypt csum_iv;	/* packet checksum base */
568 			u32	nonce;		/* response re-use preventer */
569 		} rxkad;
570 		struct {
571 			struct rxgk_context *keys[4]; /* (Re-)keying buffer */
572 			u64	start_time;	/* The start time for TK derivation */
573 			u8	nonce[20];	/* Response re-use preventer */
574 			u32	enctype;	/* Kerberos 5 encoding type */
575 			u32	key_number;	/* Current key number */
576 		} rxgk;
577 	};
578 	rwlock_t		security_use_lock; /* Security use/modification lock */
579 	struct sk_buff		*tx_response;	/* Response packet to be transmitted */
580 
581 	unsigned long		flags;
582 	unsigned long		events;
583 	unsigned long		idle_timestamp;	/* Time at which last became idle */
584 	spinlock_t		state_lock;	/* state-change lock */
585 	enum rxrpc_conn_proto_state state;	/* current state of connection */
586 	enum rxrpc_call_completion completion;	/* Completion condition */
587 	s32			abort_code;	/* Abort code of connection abort */
588 	int			debug_id;	/* debug ID for printks */
589 	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
590 	unsigned int		hi_serial;	/* highest serial number received */
591 	rxrpc_serial_t		pmtud_probe;	/* Serial of MTU probe (or 0) */
592 	unsigned int		pmtud_call;	/* ID of call used for probe */
593 	u32			service_id;	/* Service ID, possibly upgraded */
594 	u32			security_level;	/* Security level selected */
595 	u8			security_ix;	/* security type */
596 	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
597 	u8			bundle_shift;	/* Index into bundle->avail_chans */
598 	bool			exclusive;	/* T if conn is exclusive */
599 	bool			upgrade;	/* T if service ID can be upgraded */
600 	u16			orig_service_id; /* Originally requested service ID */
601 	short			error;		/* Local error code */
602 };
603 
rxrpc_to_server(const struct rxrpc_skb_priv * sp)604 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
605 {
606 	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
607 }
608 
rxrpc_to_client(const struct rxrpc_skb_priv * sp)609 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
610 {
611 	return !rxrpc_to_server(sp);
612 }
613 
614 /*
615  * Flags in call->flags.
616  */
617 enum rxrpc_call_flag {
618 	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
619 	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
620 	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
621 	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
622 	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
623 	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
624 	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
625 	RXRPC_CALL_TX_NO_MORE,		/* No more data to transmit (MSG_MORE deasserted) */
626 	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
627 	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
628 	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
629 	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
630 	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
631 	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
632 	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
633 	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
634 	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
635 	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
636 	RXRPC_CALL_CONN_CHALLENGING,	/* The connection is being challenged */
637 };
638 
639 /*
640  * Events that can be raised on a call.
641  */
642 enum rxrpc_call_event {
643 	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
644 	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
645 };
646 
647 /*
648  * The states that a call can be in.
649  */
650 enum rxrpc_call_state {
651 	RXRPC_CALL_UNINITIALISED,
652 	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
653 	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
654 	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
655 	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
656 	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
657 	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
658 	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
659 	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
660 	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
661 	RXRPC_CALL_COMPLETE,		/* - call complete */
662 	NR__RXRPC_CALL_STATES
663 };
664 
665 /*
666  * Call Tx congestion management modes.
667  */
668 enum rxrpc_ca_state {
669 	RXRPC_CA_SLOW_START,
670 	RXRPC_CA_CONGEST_AVOIDANCE,
671 	RXRPC_CA_PACKET_LOSS,
672 	RXRPC_CA_FAST_RETRANSMIT,
673 	NR__RXRPC_CA_STATES
674 } __mode(byte);
675 
676 /*
677  * Current purpose of call RACK timer.  According to the RACK-TLP protocol
678  * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for
679  * one of these at once.
680  */
681 enum rxrpc_rack_timer_mode {
682 	RXRPC_CALL_RACKTIMER_OFF,		/* Timer not running */
683 	RXRPC_CALL_RACKTIMER_RACK_REORDER,	/* RACK reordering timer */
684 	RXRPC_CALL_RACKTIMER_TLP_PTO,		/* TLP timeout */
685 	RXRPC_CALL_RACKTIMER_RTO,		/* Retransmission timeout */
686 } __mode(byte);
687 
688 /*
689  * RxRPC call definition
690  * - matched by { connection, call_id }
691  */
692 struct rxrpc_call {
693 	struct rcu_head		rcu;
694 	struct rxrpc_connection	*conn;		/* connection carrying call */
695 	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
696 	struct rxrpc_peer	*peer;		/* Peer record for remote address */
697 	struct rxrpc_local	*local;		/* Representation of local endpoint */
698 	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
699 	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
700 	struct key		*key;		/* Security details */
701 	const struct rxrpc_security *security;	/* applied security module */
702 	struct mutex		user_mutex;	/* User access mutex */
703 	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
704 	ktime_t			delay_ack_at;	/* When DELAY ACK needs to happen */
705 	ktime_t			rack_timo_at;	/* When ACK is figured as lost */
706 	ktime_t			ping_at;	/* When next to send a ping */
707 	ktime_t			keepalive_at;	/* When next to send a keepalive ping */
708 	ktime_t			expect_rx_by;	/* When we expect to get a packet by */
709 	ktime_t			expect_req_by;	/* When we expect to get a request DATA packet by */
710 	ktime_t			expect_term_by;	/* When we expect call termination by */
711 	u32			next_rx_timo;	/* Timeout for next Rx packet (ms) */
712 	u32			next_req_timo;	/* Timeout for next Rx request packet (ms) */
713 	u32			hard_timo;	/* Maximum lifetime or 0 (s) */
714 	struct timer_list	timer;		/* Combined event timer */
715 	struct work_struct	destroyer;	/* In-process-context destroyer */
716 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
717 	struct list_head	link;		/* link in master call list */
718 	struct list_head	wait_link;	/* Link in local->new_client_calls */
719 	struct hlist_node	error_link;	/* link in error distribution list */
720 	struct list_head	accept_link;	/* Link in rx->acceptq */
721 	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
722 	struct list_head	sock_link;	/* Link in rx->sock_calls */
723 	struct rb_node		sock_node;	/* Node in rx->calls */
724 	struct list_head	attend_link;	/* Link in local->call_attend_q */
725 	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
726 	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
727 	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
728 	unsigned long		user_call_ID;	/* user-defined call ID */
729 	unsigned long		flags;
730 	unsigned long		events;
731 	spinlock_t		notify_lock;	/* Kernel notification lock */
732 	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
733 	s32			send_abort;	/* Abort code to be sent */
734 	short			send_abort_err;	/* Error to be associated with the abort */
735 	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
736 	s32			abort_code;	/* Local/remote abort code */
737 	int			error;		/* Local error incurred */
738 	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
739 	enum rxrpc_call_completion completion;	/* Call completion condition */
740 	refcount_t		ref;
741 	u8			security_ix;	/* Security type */
742 	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
743 	u32			call_id;	/* call ID on connection  */
744 	u32			cid;		/* connection ID plus channel index */
745 	u32			security_level;	/* Security level selected */
746 	u32			security_enctype; /* Security-specific encoding type (or 0) */
747 	int			debug_id;	/* debug ID for printks */
748 	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
749 	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
750 
751 	/* Sendmsg data tracking. */
752 	rxrpc_seq_t		send_top;	/* Highest Tx slot filled by sendmsg. */
753 	struct rxrpc_txqueue	*send_queue;	/* Queue that sendmsg is writing into */
754 
755 	/* Transmitted data tracking. */
756 	struct rxrpc_txqueue	*tx_queue;	/* Start of transmission buffers */
757 	struct rxrpc_txqueue	*tx_qtail;	/* End of transmission buffers */
758 	rxrpc_seq_t		tx_qbase;	/* First slot in tx_queue */
759 	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
760 	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
761 	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
762 	rxrpc_serial_t		tx_last_serial;	/* Serial of last DATA transmitted */
763 	u16			tx_backoff;	/* Delay to insert due to Tx failure (ms) */
764 	u16			tx_nr_sent;	/* Number of packets sent, but unacked */
765 	u16			tx_nr_lost;	/* Number of packets marked lost */
766 	u16			tx_nr_resent;	/* Number of packets resent, but unacked */
767 	u16			tx_winsize;	/* Maximum size of Tx window */
768 #define RXRPC_TX_MAX_WINDOW	128
769 	u8			tx_jumbo_max;	/* Maximum subpkts peer will accept */
770 	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
771 
772 	/* Received data tracking */
773 	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
774 	struct sk_buff_head	rx_queue;	/* Queue of packets for this call to receive */
775 	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
776 
777 	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
778 	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
779 	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
780 	u8			rx_winsize;	/* Size of Rx window */
781 
782 	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
783 	 * is fixed, we keep these numbers in terms of segments (ie. DATA
784 	 * packets) rather than bytes.
785 	 */
786 #define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
787 #define RXRPC_MIN_CWND		4
788 	enum rxrpc_ca_state	cong_ca_state;	/* Congestion control state */
789 	u8			cong_extra;	/* Extra to send for congestion management */
790 	u16			cong_cwnd;	/* Congestion window size */
791 	u16			cong_ssthresh;	/* Slow-start threshold */
792 	u16			cong_dup_acks;	/* Count of ACKs showing missing packets */
793 	u16			cong_cumul_acks; /* Cumulative ACK count */
794 	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
795 
796 	/* RACK-TLP [RFC8985] state. */
797 	ktime_t			rack_xmit_ts;	/* Latest transmission timestamp */
798 	ktime_t			rack_rtt;	/* RTT of most recently ACK'd segment */
799 	ktime_t			rack_rtt_ts;	/* Timestamp of rack_rtt */
800 	ktime_t			rack_reo_wnd;	/* Reordering window */
801 	unsigned int		rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */
802 	int			rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */
803 	rxrpc_seq_t		rack_fack;	/* Highest sequence so far ACK'd */
804 	rxrpc_seq_t		rack_end_seq;	/* Highest sequence seen */
805 	rxrpc_seq_t		rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */
806 	bool			rack_dsack_round_none; /* T if dsack_round is "None" */
807 	bool			rack_reordering_seen; /* T if detected reordering event */
808 	enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */
809 	bool			tlp_is_retrans;	/* T if unacked TLP retransmission */
810 	rxrpc_serial_t		tlp_serial;	/* Serial of TLP probe (or 0 if none in progress) */
811 	rxrpc_seq_t		tlp_seq;	/* Sequence of TLP probe */
812 	unsigned int		tlp_rtt_taken;	/* Last time RTT taken */
813 	ktime_t			tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */
814 
815 	/* Receive-phase ACK management (ACKs we send). */
816 	u8			ackr_reason;	/* reason to ACK */
817 	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
818 	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
819 	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
820 	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
821 	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
822 	struct {
823 #define RXRPC_SACK_SIZE 256
824 		 /* SACK table for soft-acked packets */
825 		u8		ackr_sack_table[RXRPC_SACK_SIZE];
826 	} __aligned(8);
827 
828 	/* RTT management */
829 	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
830 	ktime_t			rtt_sent_at[4];	/* Time packet sent */
831 	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
832 						 * Mask of pending samples in 8-11 */
833 #define RXRPC_CALL_RTT_AVAIL_MASK	0xf
834 #define RXRPC_CALL_RTT_PEND_SHIFT	8
835 
836 	/* Transmission-phase ACK management (ACKs we've received). */
837 	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
838 	rxrpc_seq_t		acks_hard_ack;	/* Highest sequence hard acked */
839 	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
840 	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
841 	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
842 	unsigned short		acks_nr_sacks;	/* Number of soft acks recorded */
843 	unsigned short		acks_nr_snacks;	/* Number of soft nacks recorded */
844 
845 	/* Calculated RTT cache */
846 	ktime_t			rtt_last_req;	/* Time of last RTT request */
847 	unsigned int		rtt_count;	/* Number of samples we've got */
848 	unsigned int		rtt_taken;	/* Number of samples taken (wrapping) */
849 	struct minmax		min_rtt;	/* Estimated minimum RTT */
850 	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
851 	u32			mdev_us;	/* medium deviation			*/
852 	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
853 	u32			rttvar_us;	/* smoothed mdev_max			*/
854 	u32			rto_us;		/* Retransmission timeout in usec */
855 	u8			backoff;	/* Backoff timeout (as shift) */
856 };
857 
858 /*
859  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
860  */
861 struct rxrpc_ack_summary {
862 	rxrpc_serial_t	ack_serial;		/* Serial number of ACK */
863 	rxrpc_serial_t	acked_serial;		/* Serial number ACK'd */
864 	u16		in_flight;		/* Number of unreceived transmissions */
865 	u16		nr_new_hacks;		/* Number of rotated new ACKs */
866 	u16		nr_new_sacks;		/* Number of new soft ACKs in packet */
867 	u16		nr_new_snacks;		/* Number of new soft nacks in packet */
868 	u8		ack_reason;
869 	bool		new_low_snack:1;	/* T if new low soft NACK found */
870 	bool		retrans_timeo:1;	/* T if reTx due to timeout happened */
871 	bool		need_retransmit:1;	/* T if we need transmission */
872 	bool		rtt_sample_avail:1;	/* T if RTT sample available */
873 	bool		in_fast_or_rto_recovery:1;
874 	bool		exiting_fast_or_rto_recovery:1;
875 	bool		tlp_probe_acked:1;	/* T if the TLP probe seq was acked */
876 	u8 /*enum rxrpc_congest_change*/ change;
877 };
878 
879 /*
880  * sendmsg() cmsg-specified parameters.
881  */
882 enum rxrpc_command {
883 	RXRPC_CMD_SEND_DATA,		/* send data message */
884 	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
885 	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
886 	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
887 };
888 
889 struct rxrpc_call_params {
890 	s64			tx_total_len;	/* Total Tx data length (if send data) */
891 	unsigned long		user_call_ID;	/* User's call ID */
892 	struct {
893 		u32		hard;		/* Maximum lifetime (sec) */
894 		u32		idle;		/* Max time since last data packet (msec) */
895 		u32		normal;		/* Max time since last call packet (msec) */
896 	} timeouts;
897 	u8			nr_timeouts;	/* Number of timeouts specified */
898 	bool			kernel;		/* T if kernel is making the call */
899 	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
900 };
901 
902 struct rxrpc_send_params {
903 	struct rxrpc_call_params call;
904 	u32			abort_code;	/* Abort code to Tx (if abort) */
905 	enum rxrpc_command	command : 8;	/* The command to implement */
906 	bool			exclusive;	/* Shared or exclusive call */
907 	bool			upgrade;	/* If the connection is upgradeable */
908 };
909 
910 /*
911  * Buffer of data to be output as a packet.
912  */
913 struct rxrpc_txbuf {
914 	refcount_t		ref;
915 	rxrpc_seq_t		seq;		/* Sequence number of this packet */
916 	rxrpc_serial_t		serial;		/* Last serial number transmitted with */
917 	unsigned int		call_debug_id;
918 	unsigned int		debug_id;
919 	unsigned short		len;		/* Amount of data in buffer */
920 	unsigned short		space;		/* Remaining data space */
921 	unsigned short		offset;		/* Offset of fill point */
922 	unsigned short		crypto_header;	/* Size of crypto header */
923 	unsigned short		sec_header;	/* Size of security header */
924 	unsigned short		pkt_len;	/* Size of packet content */
925 	unsigned short		alloc_size;	/* Amount of bufferage allocated */
926 	unsigned int		flags;
927 #define RXRPC_TXBUF_WIRE_FLAGS	0xff		/* The wire protocol flags */
928 #define RXRPC_TXBUF_RESENT	0x100		/* Set if has been resent */
929 	__be16			cksum;		/* Checksum to go in header */
930 	bool			jumboable;	/* Can be non-terminal jumbo subpacket */
931 	void			*data;		/* Data with preceding jumbo header */
932 };
933 
rxrpc_sending_to_server(const struct rxrpc_txbuf * txb)934 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
935 {
936 	return txb->flags & RXRPC_CLIENT_INITIATED;
937 }
938 
rxrpc_sending_to_client(const struct rxrpc_txbuf * txb)939 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
940 {
941 	return !rxrpc_sending_to_server(txb);
942 }
943 
944 /*
945  * Transmit queue element, including RACK [RFC8985] per-segment metadata.  The
946  * transmission timestamp is in usec from the base.
947  */
948 struct rxrpc_txqueue {
949 	/* Start with the members we want to prefetch. */
950 	struct rxrpc_txqueue	*next;
951 	ktime_t			xmit_ts_base;
952 	rxrpc_seq_t		qbase;
953 	u8			nr_reported_acks; /* Number of segments explicitly acked/nacked */
954 	unsigned long		segment_acked;	/* Bit-per-buf: Set if ACK'd */
955 	unsigned long		segment_lost;	/* Bit-per-buf: Set if declared lost */
956 	unsigned long		segment_retransmitted; /* Bit-per-buf: Set if retransmitted */
957 	unsigned long		rtt_samples;	/* Bit-per-buf: Set if available for RTT */
958 	unsigned long		ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */
959 
960 	/* The arrays we want to pack into as few cache lines as possible. */
961 	struct {
962 #define RXRPC_NR_TXQUEUE BITS_PER_LONG
963 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1)
964 		struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE];
965 		unsigned int	segment_serial[RXRPC_NR_TXQUEUE];
966 		unsigned int	segment_xmit_ts[RXRPC_NR_TXQUEUE];
967 	} ____cacheline_aligned;
968 };
969 
970 /*
971  * Data transmission request.
972  */
973 struct rxrpc_send_data_req {
974 	ktime_t			now;		/* Current time */
975 	struct rxrpc_txqueue	*tq;		/* Tx queue segment holding first DATA */
976 	rxrpc_seq_t		seq;		/* Sequence of first data */
977 	int			n;		/* Number of DATA packets to glue into jumbo */
978 	bool			retrans;	/* T if this is a retransmission */
979 	bool			did_send;	/* T if did actually send */
980 	bool			tlp_probe;	/* T if this is a TLP probe */
981 	int /* enum rxrpc_txdata_trace */ trace;
982 };
983 
984 #include <trace/events/rxrpc.h>
985 
986 /*
987  * Allocate the next serial number on a connection.  0 must be skipped.
988  */
rxrpc_get_next_serial(struct rxrpc_connection * conn)989 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
990 {
991 	rxrpc_serial_t serial;
992 
993 	serial = conn->tx_serial;
994 	if (serial == 0)
995 		serial = 1;
996 	conn->tx_serial = serial + 1;
997 	return serial;
998 }
999 
1000 /*
1001  * Allocate the next serial n numbers on a connection.  0 must be skipped.
1002  */
rxrpc_get_next_serials(struct rxrpc_connection * conn,unsigned int n)1003 static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn,
1004 						    unsigned int n)
1005 {
1006 	rxrpc_serial_t serial;
1007 
1008 	serial = conn->tx_serial;
1009 	if (serial + n <= n)
1010 		serial = 1;
1011 	conn->tx_serial = serial + n;
1012 	return serial;
1013 }
1014 
1015 /*
1016  * af_rxrpc.c
1017  */
1018 extern atomic_t rxrpc_n_rx_skbs;
1019 extern struct workqueue_struct *rxrpc_workqueue;
1020 
1021 /*
1022  * call_accept.c
1023  */
1024 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
1025 void rxrpc_discard_prealloc(struct rxrpc_sock *);
1026 bool rxrpc_new_incoming_call(struct rxrpc_local *local,
1027 			     struct rxrpc_peer *peer,
1028 			     struct rxrpc_connection *conn,
1029 			     struct sockaddr_rxrpc *peer_srx,
1030 			     struct sk_buff *skb);
1031 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
1032 
1033 /*
1034  * call_event.c
1035  */
1036 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
1037 			enum rxrpc_propose_ack_trace why);
1038 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
1039 			     enum rxrpc_propose_ack_trace);
1040 void rxrpc_resend_tlp(struct rxrpc_call *call);
1041 void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit,
1042 			      enum rxrpc_txdata_trace trace);
1043 bool rxrpc_input_call_event(struct rxrpc_call *call);
1044 
1045 /*
1046  * call_object.c
1047  */
1048 extern const char *const rxrpc_call_states[];
1049 extern const char *const rxrpc_call_completions[];
1050 extern struct kmem_cache *rxrpc_call_jar;
1051 
1052 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
1053 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
1054 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
1055 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
1056 					 struct rxrpc_conn_parameters *,
1057 					 struct rxrpc_call_params *, gfp_t,
1058 					 unsigned int)
1059 	__releases(&rx->sk.sk_lock)
1060 	__acquires(&call->user_mutex);
1061 void rxrpc_start_call_timer(struct rxrpc_call *call);
1062 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
1063 			 struct sk_buff *);
1064 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
1065 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
1066 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
1067 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
1068 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
1069 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
1070 void rxrpc_cleanup_call(struct rxrpc_call *);
1071 void rxrpc_destroy_all_calls(struct rxrpc_net *);
1072 
rxrpc_is_service_call(const struct rxrpc_call * call)1073 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
1074 {
1075 	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
1076 }
1077 
rxrpc_is_client_call(const struct rxrpc_call * call)1078 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
1079 {
1080 	return !rxrpc_is_service_call(call);
1081 }
1082 
1083 /*
1084  * call_state.c
1085  */
1086 bool rxrpc_set_call_completion(struct rxrpc_call *call,
1087 			       enum rxrpc_call_completion compl,
1088 			       u32 abort_code,
1089 			       int error);
1090 bool rxrpc_call_completed(struct rxrpc_call *call);
1091 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
1092 		      u32 abort_code, int error, enum rxrpc_abort_reason why);
1093 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
1094 			int error);
1095 
rxrpc_set_call_state(struct rxrpc_call * call,enum rxrpc_call_state state)1096 static inline void rxrpc_set_call_state(struct rxrpc_call *call,
1097 					enum rxrpc_call_state state)
1098 {
1099 	/* Order write of completion info before write of ->state. */
1100 	smp_store_release(&call->_state, state);
1101 	wake_up(&call->waitq);
1102 }
1103 
__rxrpc_call_state(const struct rxrpc_call * call)1104 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
1105 {
1106 	return call->_state; /* Only inside I/O thread */
1107 }
1108 
__rxrpc_call_is_complete(const struct rxrpc_call * call)1109 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
1110 {
1111 	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
1112 }
1113 
rxrpc_call_state(const struct rxrpc_call * call)1114 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
1115 {
1116 	/* Order read ->state before read of completion info. */
1117 	return smp_load_acquire(&call->_state);
1118 }
1119 
rxrpc_call_is_complete(const struct rxrpc_call * call)1120 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
1121 {
1122 	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
1123 }
1124 
rxrpc_call_has_failed(const struct rxrpc_call * call)1125 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
1126 {
1127 	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
1128 }
1129 
1130 /*
1131  * conn_client.c
1132  */
1133 extern unsigned int rxrpc_reap_client_connections;
1134 extern unsigned long rxrpc_conn_idle_client_expiry;
1135 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
1136 
1137 void rxrpc_purge_client_connections(struct rxrpc_local *local);
1138 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
1139 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
1140 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
1141 void rxrpc_connect_client_calls(struct rxrpc_local *local);
1142 void rxrpc_expose_client_call(struct rxrpc_call *);
1143 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
1144 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
1145 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
1146 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
1147 
1148 /*
1149  * conn_event.c
1150  */
1151 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
1152 				unsigned int channel);
1153 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
1154 		     s32 abort_code, int err, enum rxrpc_abort_reason why);
1155 void rxrpc_process_connection(struct work_struct *);
1156 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
1157 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
1158 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
1159 
rxrpc_is_conn_aborted(const struct rxrpc_connection * conn)1160 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
1161 {
1162 	/* Order reading the abort info after the state check. */
1163 	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
1164 }
1165 
1166 /*
1167  * conn_object.c
1168  */
1169 extern unsigned int rxrpc_connection_expiry;
1170 extern unsigned int rxrpc_closed_conn_expiry;
1171 
1172 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1173 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1174 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1175 							  struct sockaddr_rxrpc *,
1176 							  struct sk_buff *);
1177 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1178 void rxrpc_disconnect_call(struct rxrpc_call *);
1179 void rxrpc_kill_client_conn(struct rxrpc_connection *);
1180 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1181 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1182 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1183 					      enum rxrpc_conn_trace);
1184 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1185 						    enum rxrpc_conn_trace);
1186 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1187 void rxrpc_service_connection_reaper(struct work_struct *);
1188 void rxrpc_destroy_all_connections(struct rxrpc_net *);
1189 
rxrpc_conn_is_client(const struct rxrpc_connection * conn)1190 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1191 {
1192 	return conn->out_clientflag;
1193 }
1194 
rxrpc_conn_is_service(const struct rxrpc_connection * conn)1195 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1196 {
1197 	return !rxrpc_conn_is_client(conn);
1198 }
1199 
rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)1200 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1201 					   unsigned long expire_at)
1202 {
1203 	timer_reduce(&conn->timer, expire_at);
1204 }
1205 
1206 /*
1207  * conn_service.c
1208  */
1209 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1210 						     struct sk_buff *);
1211 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1212 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1213 				   const struct rxrpc_security *, struct sk_buff *);
1214 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1215 
1216 /*
1217  * input.c
1218  */
1219 void rxrpc_congestion_degrade(struct rxrpc_call *);
1220 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1221 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1222 
1223 /*
1224  * input_rack.c
1225  */
1226 void rxrpc_input_rack_one(struct rxrpc_call *call,
1227 			  struct rxrpc_ack_summary *summary,
1228 			  struct rxrpc_txqueue *tq,
1229 			  unsigned int ix);
1230 void rxrpc_input_rack(struct rxrpc_call *call,
1231 		      struct rxrpc_ack_summary *summary,
1232 		      struct rxrpc_txqueue *tq,
1233 		      unsigned long new_acks);
1234 void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call,
1235 					  struct rxrpc_ack_summary *summary);
1236 ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now);
1237 void rxrpc_tlp_send_probe(struct rxrpc_call *call);
1238 void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary);
1239 void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by);
1240 
1241 /* Initialise TLP state [RFC8958 7.1]. */
rxrpc_tlp_init(struct rxrpc_call * call)1242 static inline void rxrpc_tlp_init(struct rxrpc_call *call)
1243 {
1244 	call->tlp_serial = 0;
1245 	call->tlp_seq = call->acks_hard_ack;
1246 	call->tlp_is_retrans = false;
1247 }
1248 
1249 /*
1250  * io_thread.c
1251  */
1252 int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1253 void rxrpc_error_report(struct sock *);
1254 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1255 			s32 abort_code, int err);
1256 int rxrpc_io_thread(void *data);
1257 void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb);
rxrpc_wake_up_io_thread(struct rxrpc_local * local)1258 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1259 {
1260 	if (!local->io_thread)
1261 		return;
1262 	wake_up_process(READ_ONCE(local->io_thread));
1263 }
1264 
rxrpc_protocol_error(struct sk_buff * skb,enum rxrpc_abort_reason why)1265 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1266 {
1267 	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1268 }
1269 
1270 /*
1271  * insecure.c
1272  */
1273 extern const struct rxrpc_security rxrpc_no_security;
1274 
1275 /*
1276  * key.c
1277  */
1278 extern struct key_type key_type_rxrpc;
1279 
1280 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1281 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1282 			      u32);
1283 
1284 /*
1285  * local_event.c
1286  */
1287 void rxrpc_gen_version_string(void);
1288 void rxrpc_send_version_request(struct rxrpc_local *local,
1289 				struct rxrpc_host_header *hdr,
1290 				struct sk_buff *skb);
1291 
1292 /*
1293  * local_object.c
1294  */
1295 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1296 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1297 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1298 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1299 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1300 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1301 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1302 void rxrpc_destroy_local(struct rxrpc_local *local);
1303 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1304 
__rxrpc_use_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1305 static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1306 				     enum rxrpc_local_trace why)
1307 {
1308 	int r, u;
1309 
1310 	r = refcount_read(&local->ref);
1311 	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1312 	trace_rxrpc_local(local->debug_id, why, r, u);
1313 	return u != 0;
1314 }
1315 
rxrpc_see_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1316 static inline void rxrpc_see_local(struct rxrpc_local *local,
1317 				   enum rxrpc_local_trace why)
1318 {
1319 	int r, u;
1320 
1321 	r = refcount_read(&local->ref);
1322 	u = atomic_read(&local->active_users);
1323 	trace_rxrpc_local(local->debug_id, why, r, u);
1324 }
1325 
1326 /*
1327  * misc.c
1328  */
1329 extern unsigned int rxrpc_max_backlog __read_mostly;
1330 extern unsigned long rxrpc_soft_ack_delay;
1331 extern unsigned long rxrpc_idle_ack_delay;
1332 extern unsigned int rxrpc_rx_window_size;
1333 extern unsigned int rxrpc_rx_mtu;
1334 extern unsigned int rxrpc_rx_jumbo_max;
1335 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1336 extern unsigned long rxrpc_inject_rx_delay;
1337 #endif
1338 
1339 /*
1340  * net_ns.c
1341  */
1342 extern unsigned int rxrpc_net_id;
1343 extern struct pernet_operations rxrpc_net_ops;
1344 
rxrpc_net(struct net * net)1345 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1346 {
1347 	return net_generic(net, rxrpc_net_id);
1348 }
1349 
1350 /*
1351  * out_of_band.c
1352  */
1353 void rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb);
1354 void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb);
1355 int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len);
1356 
1357 /*
1358  * output.c
1359  */
1360 ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len);
1361 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason,
1362 		    rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why);
1363 void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call);
1364 int rxrpc_send_abort_packet(struct rxrpc_call *);
1365 void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req);
1366 void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1367 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1368 void rxrpc_send_keepalive(struct rxrpc_peer *);
1369 void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb);
1370 
1371 /*
1372  * peer_event.c
1373  */
1374 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1375 void rxrpc_peer_keepalive_worker(struct work_struct *);
1376 void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial,
1377 				 bool sendmsg_fail);
1378 
1379 /*
1380  * peer_object.c
1381  */
1382 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1383 					 const struct sockaddr_rxrpc *);
1384 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1385 				     struct sockaddr_rxrpc *srx, gfp_t gfp);
1386 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1387 				    enum rxrpc_peer_trace);
1388 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1389 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1390 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1391 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1392 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1393 
1394 /*
1395  * proc.c
1396  */
1397 extern const struct seq_operations rxrpc_call_seq_ops;
1398 extern const struct seq_operations rxrpc_connection_seq_ops;
1399 extern const struct seq_operations rxrpc_bundle_seq_ops;
1400 extern const struct seq_operations rxrpc_peer_seq_ops;
1401 extern const struct seq_operations rxrpc_local_seq_ops;
1402 
1403 /*
1404  * recvmsg.c
1405  */
1406 void rxrpc_notify_socket(struct rxrpc_call *);
1407 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1408 
1409 /*
1410  * Abort a call due to a protocol error.
1411  */
rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,s32 abort_code,enum rxrpc_abort_reason why)1412 static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1413 				     struct sk_buff *skb,
1414 				     s32 abort_code,
1415 				     enum rxrpc_abort_reason why)
1416 {
1417 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1418 
1419 	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1420 	return -EPROTO;
1421 }
1422 
1423 /*
1424  * rtt.c
1425  */
1426 void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
1427 			int rtt_slot,
1428 			rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
1429 			ktime_t send_time, ktime_t resp_time);
1430 ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans);
1431 void rxrpc_call_init_rtt(struct rxrpc_call *call);
1432 
1433 /*
1434  * rxgk.c
1435  */
1436 extern const struct rxrpc_security rxgk_yfs;
1437 
1438 /*
1439  * rxkad.c
1440  */
1441 #ifdef CONFIG_RXKAD
1442 extern const struct rxrpc_security rxkad;
1443 #endif
1444 
1445 /*
1446  * security.c
1447  */
1448 int __init rxrpc_init_security(void);
1449 const struct rxrpc_security *rxrpc_security_lookup(u8);
1450 void rxrpc_exit_security(void);
1451 int rxrpc_init_client_call_security(struct rxrpc_call *);
1452 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1453 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1454 							 struct sk_buff *);
1455 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1456 					  struct sk_buff *, u32, u32);
1457 
1458 /*
1459  * sendmsg.c
1460  */
1461 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1462 			 enum rxrpc_abort_reason why);
1463 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1464 
1465 /*
1466  * server_key.c
1467  */
1468 extern struct key_type key_type_rxrpc_s;
1469 
1470 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1471 
1472 /*
1473  * skbuff.c
1474  */
1475 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1476 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1477 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1478 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1479 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1480 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1481 void rxrpc_purge_queue(struct sk_buff_head *);
1482 
1483 /*
1484  * stats.c
1485  */
1486 int rxrpc_stats_show(struct seq_file *seq, void *v);
1487 int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1488 
1489 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1490 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1491 
1492 /*
1493  * sysctl.c
1494  */
1495 #ifdef CONFIG_SYSCTL
1496 extern int __init rxrpc_sysctl_init(void);
1497 extern void rxrpc_sysctl_exit(void);
1498 #else
rxrpc_sysctl_init(void)1499 static inline int __init rxrpc_sysctl_init(void) { return 0; }
rxrpc_sysctl_exit(void)1500 static inline void rxrpc_sysctl_exit(void) {}
1501 #endif
1502 
1503 /*
1504  * txbuf.c
1505  */
1506 extern atomic_t rxrpc_nr_txbuf;
1507 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size,
1508 					   size_t data_align, gfp_t gfp);
1509 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1510 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1511 
1512 /*
1513  * utils.c
1514  */
1515 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1516 
before(u32 seq1,u32 seq2)1517 static inline bool before(u32 seq1, u32 seq2)
1518 {
1519         return (s32)(seq1 - seq2) < 0;
1520 }
before_eq(u32 seq1,u32 seq2)1521 static inline bool before_eq(u32 seq1, u32 seq2)
1522 {
1523         return (s32)(seq1 - seq2) <= 0;
1524 }
after(u32 seq1,u32 seq2)1525 static inline bool after(u32 seq1, u32 seq2)
1526 {
1527         return (s32)(seq1 - seq2) > 0;
1528 }
after_eq(u32 seq1,u32 seq2)1529 static inline bool after_eq(u32 seq1, u32 seq2)
1530 {
1531         return (s32)(seq1 - seq2) >= 0;
1532 }
1533 
earliest(u32 seq1,u32 seq2)1534 static inline u32 earliest(u32 seq1, u32 seq2)
1535 {
1536 	return before(seq1, seq2) ? seq1 : seq2;
1537 }
1538 
latest(u32 seq1,u32 seq2)1539 static inline u32 latest(u32 seq1, u32 seq2)
1540 {
1541 	return after(seq1, seq2) ? seq1 : seq2;
1542 }
1543 
rxrpc_seq_in_txq(const struct rxrpc_txqueue * tq,rxrpc_seq_t seq)1544 static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq)
1545 {
1546 	return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase;
1547 }
1548 
rxrpc_queue_rx_call_packet(struct rxrpc_call * call,struct sk_buff * skb)1549 static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb)
1550 {
1551 	rxrpc_get_skb(skb, rxrpc_skb_get_call_rx);
1552 	__skb_queue_tail(&call->rx_queue, skb);
1553 	rxrpc_poke_call(call, rxrpc_call_poke_rx_packet);
1554 }
1555 
1556 /*
1557  * Calculate how much space there is for transmitting more DATA packets.
1558  */
rxrpc_tx_window_space(const struct rxrpc_call * call)1559 static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call)
1560 {
1561 	int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra);
1562 	int transmitted = call->tx_top - call->tx_bottom;
1563 
1564 	return max(winsize - transmitted, 0);
1565 }
1566 
rxrpc_left_out(const struct rxrpc_call * call)1567 static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call)
1568 {
1569 	return call->acks_nr_sacks + call->tx_nr_lost;
1570 }
1571 
1572 /*
1573  * Calculate the number of transmitted DATA packets assumed to be in flight
1574  * [approx RFC6675].
1575  */
rxrpc_tx_in_flight(const struct rxrpc_call * call)1576 static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call)
1577 {
1578 	return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent;
1579 }
1580 
1581 /*
1582  * debug tracing
1583  */
1584 extern unsigned int rxrpc_debug;
1585 
1586 #define dbgprintk(FMT,...) \
1587 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1588 
1589 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1590 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1591 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1592 
1593 
1594 #if defined(__KDEBUG)
1595 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1596 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1597 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1598 
1599 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1600 #define RXRPC_DEBUG_KENTER	0x01
1601 #define RXRPC_DEBUG_KLEAVE	0x02
1602 #define RXRPC_DEBUG_KDEBUG	0x04
1603 
1604 #define _enter(FMT,...)					\
1605 do {							\
1606 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1607 		kenter(FMT,##__VA_ARGS__);		\
1608 } while (0)
1609 
1610 #define _leave(FMT,...)					\
1611 do {							\
1612 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1613 		kleave(FMT,##__VA_ARGS__);		\
1614 } while (0)
1615 
1616 #define _debug(FMT,...)					\
1617 do {							\
1618 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1619 		kdebug(FMT,##__VA_ARGS__);		\
1620 } while (0)
1621 
1622 #else
1623 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1624 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1625 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1626 #endif
1627 
1628 /*
1629  * debug assertion checking
1630  */
1631 #if 1 // defined(__KDEBUGALL)
1632 
1633 #define ASSERT(X)						\
1634 do {								\
1635 	if (unlikely(!(X))) {					\
1636 		pr_err("Assertion failed\n");			\
1637 		BUG();						\
1638 	}							\
1639 } while (0)
1640 
1641 #define ASSERTCMP(X, OP, Y)						\
1642 do {									\
1643 	__typeof__(X) _x = (X);						\
1644 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1645 	if (unlikely(!(_x OP _y))) {					\
1646 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1647 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1648 		       (unsigned long)_y, (unsigned long)_y);		\
1649 		BUG();							\
1650 	}								\
1651 } while (0)
1652 
1653 #define ASSERTIF(C, X)						\
1654 do {								\
1655 	if (unlikely((C) && !(X))) {				\
1656 		pr_err("Assertion failed\n");			\
1657 		BUG();						\
1658 	}							\
1659 } while (0)
1660 
1661 #define ASSERTIFCMP(C, X, OP, Y)					\
1662 do {									\
1663 	__typeof__(X) _x = (X);						\
1664 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1665 	if (unlikely((C) && !(_x OP _y))) {				\
1666 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1667 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1668 		       (unsigned long)_y, (unsigned long)_y);		\
1669 		BUG();							\
1670 	}								\
1671 } while (0)
1672 
1673 #else
1674 
1675 #define ASSERT(X)				\
1676 do {						\
1677 } while (0)
1678 
1679 #define ASSERTCMP(X, OP, Y)			\
1680 do {						\
1681 } while (0)
1682 
1683 #define ASSERTIF(C, X)				\
1684 do {						\
1685 } while (0)
1686 
1687 #define ASSERTIFCMP(C, X, OP, Y)		\
1688 do {						\
1689 } while (0)
1690 
1691 #endif /* __KDEBUGALL */
1692