1 /* SPDX-License-Identifier: GPL-2.0-or-later */
15 #include <keys/rxrpc-type.h>
37  * Mark applied to socket buffers in skb->mark.  skb->priority is used
46 	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
47 	RXRPC_SKB_MARK_REJECT_CONN_ABORT, /* Reject with connection ABORT (code in skb->priority) */
65  * Per-network namespace data.
69 	u32			epoch;		/* Local epoch for detecting local-end reset */
71 	spinlock_t		call_lock;	/* Lock for ->calls */
78 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
87 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
90 	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
165 	struct rb_root		calls;		/* User ID -> call mapping */
187  * CPU-byteorder normalised Rx packet header.
192 	u32		callNumber;	/* call ID (0 for connection-level packets) */
197 	u8		userStatus;	/* app-layer defined status */
208  * - max 48 bytes (struct sk_buff::cb)
243 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
318 	/* Default ticket -> key decoder */
326  * - owned by a single AF_RXRPC socket
327  * - pointed to by transport socket struct sk_user_data
363 	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
378  * - matched by local endpoint, remote port, address and protocol type
388 	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
399 	unsigned int		pmtud_bad;	/* Smallest non-working MTU probe we've tried */
403 	u8			pmtud_jumbo;	/* Max jumbo packets for the MTU */
404 	bool			ackr_adv_pmtud;	/* T if the peer advertises path-MTU */
406 	unsigned int		if_mtu;		/* Local interface MTU (- hdrsize) for this peer */
415 	u8			cong_ssthresh;	/* Congestion slow-start threshold */
445 	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
446 	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
447 	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
448 	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
449 	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
457 	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
501 	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
512 	struct rb_node		local_node;	/* Node in local->client_conns */
516 	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
521  * - matched by { local, peer, epoch, conn_id, direction }
522  * - each connection can only handle four simultaneous calls
530 	struct list_head	attend_link;	/* Link in local->conn_attend_q */
541 		unsigned int		call_debug_id;	/* call->debug_id */
554 	struct work_struct	destructor;	/* In-process-context destroyer */
556 	struct rb_node		service_node;	/* Node in peer->service_conns */
559 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
569 			u32	nonce;		/* response re-use preventer */
572 			struct rxgk_context *keys[4]; /* (Re-)keying buffer */
574 			u8	nonce[20];	/* Response re-use preventer */
585 	spinlock_t		state_lock;	/* state-change lock */
598 	u8			bundle_shift;	/* Index into bundle->avail_chans */
607 	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;  in rxrpc_to_server()
616  * Flags in call->flags.
619 	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
625 	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
628 	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
634 	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
635 	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
653 	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
654 	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
655 	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
656 	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
657 	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
658 	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
659 	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
660 	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
661 	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
662 	RXRPC_CALL_COMPLETE,		/* - call complete */
678  * Current purpose of call RACK timer.  According to the RACK-TLP protocol
679  * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for
685 	RXRPC_CALL_RACKTIMER_TLP_PTO,		/* TLP timeout */
686 	RXRPC_CALL_RACKTIMER_RTO,		/* Retransmission timeout */
691  * - matched by { connection, call_id }
712 	u32			next_rx_timo;	/* Timeout for next Rx packet (ms) */
713 	u32			next_req_timo;	/* Timeout for next Rx request packet (ms) */
716 	struct work_struct	destroyer;	/* In-process-context destroyer */
717 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
719 	struct list_head	wait_link;	/* Link in local->new_client_calls */
721 	struct list_head	accept_link;	/* Link in rx->acceptq */
722 	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
723 	struct list_head	sock_link;	/* Link in rx->sock_calls */
724 	struct rb_node		sock_node;	/* Node in rx->calls */
725 	struct list_head	attend_link;	/* Link in local->call_attend_q */
728 	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
729 	unsigned long		user_call_ID;	/* user-defined call ID */
747 	u32			security_enctype; /* Security-specific encoding type (or 0) */
764 	u16			tx_backoff;	/* Delay to insert due to Tx failure (ms) */
781 	u8			rx_winsize;	/* Size of Rx window */
783 	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
792 	u16			cong_ssthresh;	/* Slow-start threshold */
797 	/* RACK-TLP [RFC8985] state. */
814 	ktime_t			tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */
816 	/* Receive-phase ACK management (ACKs we send). */
825 		 /* SACK table for soft-acked packets */
832 	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
833 						 * Mask of pending samples in 8-11 */
837 	/* Transmission-phase ACK management (ACKs we've received). */
855 	u32			rto_us;		/* Retransmission timeout in usec */
856 	u8			backoff;	/* Backoff timeout (as shift) */
871 	bool		retrans_timeo:1;	/* T if reTx due to timeout happened */
881  * sendmsg() cmsg-specified parameters.
895 		u32		idle;		/* Max time since last data packet (msec) */
896 		u32		normal;		/* Max time since last call packet (msec) */
931 	bool			jumboable;	/* Can be non-terminal jumbo subpacket */
937 	return txb->flags & RXRPC_CLIENT_INITIATED;  in rxrpc_sending_to_server()
946  * Transmit queue element, including RACK [RFC8985] per-segment metadata.  The
955 	unsigned long		segment_acked;	/* Bit-per-buf: Set if ACK'd */
956 	unsigned long		segment_lost;	/* Bit-per-buf: Set if declared lost */
957 	unsigned long		segment_retransmitted; /* Bit-per-buf: Set if retransmitted */
958 	unsigned long		rtt_samples;	/* Bit-per-buf: Set if available for RTT */
959 	unsigned long		ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */
964 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1)
994 	serial = conn->tx_serial;  in rxrpc_get_next_serial()
997 	conn->tx_serial = serial + 1;  in rxrpc_get_next_serial()
1009 	serial = conn->tx_serial;  in rxrpc_get_next_serials()
1012 	conn->tx_serial = serial + n;  in rxrpc_get_next_serials()
1060 	__releases(&rx->sk.sk_lock)
1061 	__acquires(&call->user_mutex);
1076 	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);  in rxrpc_is_service_call()
1100 	/* Order write of completion info before write of ->state. */  in rxrpc_set_call_state()
1101 	smp_store_release(&call->_state, state);  in rxrpc_set_call_state()
1102 	wake_up(&call->waitq);  in rxrpc_set_call_state()
1107 	return call->_state; /* Only inside I/O thread */  in __rxrpc_call_state()
1117 	/* Order read ->state before read of completion info. */  in rxrpc_call_state()
1118 	return smp_load_acquire(&call->_state);  in rxrpc_call_state()
1128 	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;  in rxrpc_call_has_failed()
1164 	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;  in rxrpc_is_conn_aborted()
1193 	return conn->out_clientflag;  in rxrpc_conn_is_client()
1204 	timer_reduce(&conn->timer, expire_at);  in rxrpc_reduce_conn_timer()
1245 	call->tlp_serial = 0;  in rxrpc_tlp_init()
1246 	call->tlp_seq = call->acks_hard_ack;  in rxrpc_tlp_init()
1247 	call->tlp_is_retrans = false;  in rxrpc_tlp_init()
1263 	if (!local->io_thread)  in rxrpc_wake_up_io_thread()
1265 	wake_up_process(READ_ONCE(local->io_thread));  in rxrpc_wake_up_io_thread()
1270 	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);  in rxrpc_protocol_error()
1313 	r = refcount_read(&local->ref);  in __rxrpc_use_local()
1314 	u = atomic_fetch_add_unless(&local->active_users, 1, 0);  in __rxrpc_use_local()
1315 	trace_rxrpc_local(local->debug_id, why, r, u);  in __rxrpc_use_local()
1324 	r = refcount_read(&local->ref);  in rxrpc_see_local()
1325 	u = atomic_read(&local->active_users);  in rxrpc_see_local()
1326 	trace_rxrpc_local(local->debug_id, why, r, u);  in rxrpc_see_local()
1357 void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb);
1358 int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len);
1423 	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);  in rxrpc_abort_eproto()
1424 	return -EPROTO;  in rxrpc_abort_eproto()
1493 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1494 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1523         return (s32)(seq1 - seq2) < 0;  in before()
1527         return (s32)(seq1 - seq2) <= 0;  in before_eq()
1531         return (s32)(seq1 - seq2) > 0;  in after()
1535         return (s32)(seq1 - seq2) >= 0;  in after_eq()
1550 	return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase;  in rxrpc_seq_in_txq()
1556 	__skb_queue_tail(&call->rx_queue, skb);  in rxrpc_queue_rx_call_packet()
1565 	int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra);  in rxrpc_tx_window_space()
1566 	int transmitted = call->tx_top - call->tx_bottom;  in rxrpc_tx_window_space()
1568 	return max(winsize - transmitted, 0);  in rxrpc_tx_window_space()
1573 	return call->acks_nr_sacks + call->tx_nr_lost;  in rxrpc_left_out()
1582 	return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent;  in rxrpc_tx_in_flight()
1591 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1650 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1670 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \