1 /* SPDX-License-Identifier: GPL-2.0-or-later */
15 #include <keys/rxrpc-type.h>
36  * Mark applied to socket buffers in skb->mark.  skb->priority is used
44 	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
62  * Per-network namespace data.
66 	u32			epoch;		/* Local epoch for detecting local-end reset */
68 	spinlock_t		call_lock;	/* Lock for ->calls */
75 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
84 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
87 	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
160 	struct rb_root		calls;		/* User ID -> call mapping */
181  * CPU-byteorder normalised Rx packet header.
186 	u32		callNumber;	/* call ID (0 for connection-level packets) */
188 	u32		serial;		/* serial number of pkt sent to network */  member
191 	u8		userStatus;	/* app-layer defined status */
202  * - max 48 bytes (struct sk_buff::cb)
224 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
287  * - owned by a single AF_RXRPC socket
288  * - pointed to by transport socket struct sk_user_data
324 	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
336  * - matched by local endpoint, remote port, address and protocol type
346 	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
356 	unsigned int		pmtud_bad;	/* Smallest non-working MTU probe we've tried */
361 	bool			ackr_adv_pmtud;	/* T if the peer advertises path-MTU */
363 	unsigned int		if_mtu;		/* Local interface MTU (- hdrsize) for this peer */
372 	u8			cong_ssthresh;	/* Congestion slow-start threshold */
399  * Call completion condition (state == RXRPC_CALL_COMPLETE).
402 	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
403 	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
404 	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
405 	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
406 	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
414 	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
437  * The connection protocol state.
458 	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
469 	struct rb_node		local_node;	/* Node in local->client_conns */
478  * - matched by { local, peer, epoch, conn_id, direction }
479  * - each connection can only handle four simultaneous calls
487 	struct list_head	attend_link;	/* Link in local->conn_attend_q */
498 		unsigned int		call_debug_id;	/* call->debug_id */
511 	struct work_struct	destructor;	/* In-process-context destroyer */
513 	struct rb_node		service_node;	/* Node in peer->service_conns */
516 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
526 			u32	nonce;		/* response re-use preventer */
532 	spinlock_t		state_lock;	/* state-change lock */
533 	enum rxrpc_conn_proto_state state;	/* current state of connection */  member
537 	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
538 	unsigned int		hi_serial;	/* highest serial number received */
539 	rxrpc_serial_t		pmtud_probe;	/* Serial of MTU probe (or 0) */
545 	u8			bundle_shift;	/* Index into bundle->avail_chans */
554 	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;  in rxrpc_to_server()
563  * Flags in call->flags.
566 	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
572 	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
581 	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
582 	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
600 	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
601 	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
602 	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
603 	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
604 	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
605 	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
606 	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
607 	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
608 	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
609 	RXRPC_CALL_COMPLETE,		/* - call complete */
625  * Current purpose of call RACK timer.  According to the RACK-TLP protocol
626  * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for
638  * - matched by { connection, call_id }
663 	struct work_struct	destroyer;	/* In-process-context destroyer */
666 	struct list_head	wait_link;	/* Link in local->new_client_calls */
668 	struct list_head	accept_link;	/* Link in rx->acceptq */
669 	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
670 	struct list_head	sock_link;	/* Link in rx->sock_calls */
671 	struct rb_node		sock_node;	/* Node in rx->calls */
672 	struct list_head	attend_link;	/* Link in local->call_attend_q */
675 	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
676 	unsigned long		user_call_ID;	/* user-defined call ID */
686 	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
709 	rxrpc_serial_t		tx_last_serial;	/* Serial of last DATA transmitted */
726 	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
729 	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
735 	enum rxrpc_ca_state	cong_ca_state;	/* Congestion control state */
738 	u16			cong_ssthresh;	/* Slow-start threshold */
743 	/* RACK-TLP [RFC8985] state. */
757 	rxrpc_serial_t		tlp_serial;	/* Serial of TLP probe (or 0 if none in progress) */
762 	/* Receive-phase ACK management (ACKs we send). */
771 		 /* SACK table for soft-acked packets */
776 	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
778 	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
779 						 * Mask of pending samples in 8-11 */
783 	/* Transmission-phase ACK management (ACKs we've received). */
788 	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
809 	rxrpc_serial_t	ack_serial;		/* Serial number of ACK */
810 	rxrpc_serial_t	acked_serial;		/* Serial number ACK'd */
827  * sendmsg() cmsg-specified parameters.
863 	rxrpc_serial_t		serial;		/* Last serial number transmitted with */  member
875 	bool			jumboable;	/* Can be non-terminal jumbo subpacket */
881 	return txb->flags & RXRPC_CLIENT_INITIATED;  in rxrpc_sending_to_server()
890  * Transmit queue element, including RACK [RFC8985] per-segment metadata.  The
899 	unsigned long		segment_acked;	/* Bit-per-buf: Set if ACK'd */
900 	unsigned long		segment_lost;	/* Bit-per-buf: Set if declared lost */
901 	unsigned long		segment_retransmitted; /* Bit-per-buf: Set if retransmitted */
902 	unsigned long		rtt_samples;	/* Bit-per-buf: Set if available for RTT */
903 	unsigned long		ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */
908 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1)
932  * Allocate the next serial number on a connection.  0 must be skipped.
936 	rxrpc_serial_t serial;  in rxrpc_get_next_serial()  local
938 	serial = conn->tx_serial;  in rxrpc_get_next_serial()
939 	if (serial == 0)  in rxrpc_get_next_serial()
940 		serial = 1;  in rxrpc_get_next_serial()
941 	conn->tx_serial = serial + 1;  in rxrpc_get_next_serial()
942 	return serial;  in rxrpc_get_next_serial()
946  * Allocate the next serial n numbers on a connection.  0 must be skipped.
951 	rxrpc_serial_t serial;  in rxrpc_get_next_serials()  local
953 	serial = conn->tx_serial;  in rxrpc_get_next_serials()
954 	if (serial + n <= n)  in rxrpc_get_next_serials()
955 		serial = 1;  in rxrpc_get_next_serials()
956 	conn->tx_serial = serial + n;  in rxrpc_get_next_serials()
957 	return serial;  in rxrpc_get_next_serials()
981 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
1018 	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);  in rxrpc_is_service_call()
1040 					enum rxrpc_call_state state)  in rxrpc_set_call_state()  argument
1042 	/* Order write of completion info before write of ->state. */  in rxrpc_set_call_state()
1043 	smp_store_release(&call->_state, state);  in rxrpc_set_call_state()
1044 	wake_up(&call->waitq);  in rxrpc_set_call_state()
1049 	return call->_state; /* Only inside I/O thread */  in __rxrpc_call_state()
1059 	/* Order read ->state before read of completion info. */  in rxrpc_call_state()
1060 	return smp_load_acquire(&call->_state);  in rxrpc_call_state()
1070 	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;  in rxrpc_call_has_failed()
1105 	/* Order reading the abort info after the state check. */  in rxrpc_is_conn_aborted()
1106 	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;  in rxrpc_is_conn_aborted()
1135 	return conn->out_clientflag;  in rxrpc_conn_is_client()
1146 	timer_reduce(&conn->timer, expire_at);  in rxrpc_reduce_conn_timer()
1184 /* Initialise TLP state [RFC8958 7.1]. */
1187 	call->tlp_serial = 0;  in rxrpc_tlp_init()
1188 	call->tlp_seq = call->acks_hard_ack;  in rxrpc_tlp_init()
1189 	call->tlp_is_retrans = false;  in rxrpc_tlp_init()
1202 	wake_up_process(READ_ONCE(local->io_thread));  in rxrpc_wake_up_io_thread()
1207 	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);  in rxrpc_protocol_error()
1250 	r = refcount_read(&local->ref);  in __rxrpc_use_local()
1251 	u = atomic_fetch_add_unless(&local->active_users, 1, 0);  in __rxrpc_use_local()
1252 	trace_rxrpc_local(local->debug_id, why, r, u);  in __rxrpc_use_local()
1261 	r = refcount_read(&local->ref);  in rxrpc_see_local()
1262 	u = atomic_read(&local->active_users);  in rxrpc_see_local()
1263 	trace_rxrpc_local(local->debug_id, why, r, u);  in rxrpc_see_local()
1294 		    rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why);
1350 	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);  in rxrpc_abort_eproto()
1351 	return -EPROTO;  in rxrpc_abort_eproto()
1415 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1416 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1446         return (s32)(seq1 - seq2) < 0;  in before()
1450         return (s32)(seq1 - seq2) <= 0;  in before_eq()
1454         return (s32)(seq1 - seq2) > 0;  in after()
1458         return (s32)(seq1 - seq2) >= 0;  in after_eq()
1473 	return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase;  in rxrpc_seq_in_txq()
1479 	__skb_queue_tail(&call->rx_queue, skb);  in rxrpc_queue_rx_call_packet()
1488 	int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra);  in rxrpc_tx_window_space()
1489 	int transmitted = call->tx_top - call->tx_bottom;  in rxrpc_tx_window_space()
1491 	return max(winsize - transmitted, 0);  in rxrpc_tx_window_space()
1496 	return call->acks_nr_sacks + call->tx_nr_lost;  in rxrpc_left_out()
1505 	return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent;  in rxrpc_tx_in_flight()
1514 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1573 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1593 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \