net/rxrpc/proc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* /proc/net/ support for AF_RXRPC
  *
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  */

 #include <linux/module.h>
 #include <net/sock.h>
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"

 static const char *const rxrpc_conn_states[RXRPC_CONN__NR_STATES] = {
 	[RXRPC_CONN_UNUSED]			= "Unused  ",
 	[RXRPC_CONN_CLIENT_UNSECURED]		= "ClUnsec ",
 	[RXRPC_CONN_CLIENT]			= "Client  ",
 	[RXRPC_CONN_SERVICE_PREALLOC]		= "SvPrealc",
 	[RXRPC_CONN_SERVICE_UNSECURED]		= "SvUnsec ",
 	[RXRPC_CONN_SERVICE_CHALLENGING]	= "SvChall ",
 	[RXRPC_CONN_SERVICE]			= "SvSecure",
 	[RXRPC_CONN_ABORTED]			= "Aborted ",
 };

 /*
  * generate a list of extant and dead calls in /proc/net/rxrpc_calls
  */
 static void *rxrpc_call_seq_start(struct seq_file *seq, loff_t *_pos)
 	__acquires(rcu)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	rcu_read_lock();
 	return seq_list_start_head_rcu(&rxnet->calls, *_pos);
 }

 static void *rxrpc_call_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	return seq_list_next_rcu(v, &rxnet->calls, pos);
 }

 static void rxrpc_call_seq_stop(struct seq_file *seq, void *v)
 	__releases(rcu)
 {
 	rcu_read_unlock();
 }

 static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_local *local;
 	struct rxrpc_call *call;
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	enum rxrpc_call_state state;
 	unsigned long timeout = 0;
 	rxrpc_seq_t acks_hard_ack;
 	char lbuff[50], rbuff[50];

 	if (v == &rxnet->calls) {
 		seq_puts(seq,
 			 "Proto Local                                          "
 			 " Remote                                         "
 			 " SvID ConnID   CallID   End Use State    Abort   "
 			 " DebugId  TxSeq    TW RxSeq    RW RxSerial CW RxTimo\n");
 		return 0;
 	}

 	call = list_entry(v, struct rxrpc_call, link);

 	local = call->local;
 	if (local)
 		sprintf(lbuff, "%pISpc", &local->srx.transport);
 	else
 		strcpy(lbuff, "no_local");

 	sprintf(rbuff, "%pISpc", &call->dest_srx.transport);

 	state = rxrpc_call_state(call);
 	if (state != RXRPC_CALL_SERVER_PREALLOC) {
 		timeout = READ_ONCE(call->expect_rx_by);
 		timeout -= jiffies;
 	}

 	acks_hard_ack = READ_ONCE(call->acks_hard_ack);
 	seq_printf(seq,
 		   "UDP   %-47.47s %-47.47s %4x %08x %08x %s %3u"
 		   " %-8.8s %08x %08x %08x %02x %08x %02x %08x %02x %06lx\n",
 		   lbuff,
 		   rbuff,
 		   call->dest_srx.srx_service,
 		   call->cid,
 		   call->call_id,
 		   rxrpc_is_service_call(call) ? "Svc" : "Clt",
 		   refcount_read(&call->ref),
 		   rxrpc_call_states[state],
 		   call->abort_code,
 		   call->debug_id,
 		   acks_hard_ack, READ_ONCE(call->tx_top) - acks_hard_ack,
 		   call->ackr_window, call->ackr_wtop - call->ackr_window,
 		   call->rx_serial,
 		   call->cong_cwnd,
 		   timeout);

 	return 0;
 }

 const struct seq_operations rxrpc_call_seq_ops = {
 	.start  = rxrpc_call_seq_start,
 	.next   = rxrpc_call_seq_next,
 	.stop   = rxrpc_call_seq_stop,
 	.show   = rxrpc_call_seq_show,
 };

 /*
  * generate a list of extant virtual connections in /proc/net/rxrpc_conns
  */
 static void *rxrpc_connection_seq_start(struct seq_file *seq, loff_t *_pos)
 	__acquires(rxnet->conn_lock)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	read_lock(&rxnet->conn_lock);
 	return seq_list_start_head(&rxnet->conn_proc_list, *_pos);
 }

 static void *rxrpc_connection_seq_next(struct seq_file *seq, void *v,
 				       loff_t *pos)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	return seq_list_next(v, &rxnet->conn_proc_list, pos);
 }

 static void rxrpc_connection_seq_stop(struct seq_file *seq, void *v)
 	__releases(rxnet->conn_lock)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	read_unlock(&rxnet->conn_lock);
 }

 static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_connection *conn;
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	const char *state;
 	char lbuff[50], rbuff[50];

 	if (v == &rxnet->conn_proc_list) {
 		seq_puts(seq,
 			 "Proto Local                                          "
 			 " Remote                                         "
 			 " SvID ConnID   End Ref Act State    Key     "
 			 " Serial   ISerial  CallId0  CallId1  CallId2  CallId3\n"
 			 );
 		return 0;
 	}

 	conn = list_entry(v, struct rxrpc_connection, proc_link);
 	if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) {
 		strcpy(lbuff, "no_local");
 		strcpy(rbuff, "no_connection");
 		goto print;
 	}

 	sprintf(lbuff, "%pISpc", &conn->local->srx.transport);
 	sprintf(rbuff, "%pISpc", &conn->peer->srx.transport);
 print:
 	state = rxrpc_is_conn_aborted(conn) ?
 		rxrpc_call_completions[conn->completion] :
 		rxrpc_conn_states[conn->state];
 	seq_printf(seq,
 		   "UDP   %-47.47s %-47.47s %4x %08x %s %3u %3d"
 		   " %s %08x %08x %08x %08x %08x %08x %08x\n",
 		   lbuff,
 		   rbuff,
 		   conn->service_id,
 		   conn->proto.cid,
 		   rxrpc_conn_is_service(conn) ? "Svc" : "Clt",
 		   refcount_read(&conn->ref),
 		   atomic_read(&conn->active),
 		   state,
 		   key_serial(conn->key),
 		   atomic_read(&conn->serial),
 		   conn->hi_serial,
 		   conn->channels[0].call_id,
 		   conn->channels[1].call_id,
 		   conn->channels[2].call_id,
 		   conn->channels[3].call_id);

 	return 0;
 }

 const struct seq_operations rxrpc_connection_seq_ops = {
 	.start  = rxrpc_connection_seq_start,
 	.next   = rxrpc_connection_seq_next,
 	.stop   = rxrpc_connection_seq_stop,
 	.show   = rxrpc_connection_seq_show,
 };

 /*
  * generate a list of extant virtual peers in /proc/net/rxrpc/peers
  */
 static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_peer *peer;
 	time64_t now;
 	char lbuff[50], rbuff[50];

 	if (v == SEQ_START_TOKEN) {
 		seq_puts(seq,
 			 "Proto Local                                          "
 			 " Remote                                         "
 			 " Use SST   MTU LastUse      RTT      RTO\n"
 			 );
 		return 0;
 	}

 	peer = list_entry(v, struct rxrpc_peer, hash_link);

 	sprintf(lbuff, "%pISpc", &peer->local->srx.transport);

 	sprintf(rbuff, "%pISpc", &peer->srx.transport);

 	now = ktime_get_seconds();
 	seq_printf(seq,
 		   "UDP   %-47.47s %-47.47s %3u"
 		   " %3u %5u %6llus %8u %8u\n",
 		   lbuff,
 		   rbuff,
 		   refcount_read(&peer->ref),
 		   peer->cong_ssthresh,
 		   peer->mtu,
 		   now - peer->last_tx_at,
 		   peer->srtt_us >> 3,
 		   jiffies_to_usecs(peer->rto_j));

 	return 0;
 }

 static void *rxrpc_peer_seq_start(struct seq_file *seq, loff_t *_pos)
 	__acquires(rcu)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	unsigned int bucket, n;
 	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
 	void *p;

 	rcu_read_lock();

 	if (*_pos >= UINT_MAX)
 		return NULL;

 	n = *_pos & ((1U << shift) - 1);
 	bucket = *_pos >> shift;
 	for (;;) {
 		if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
 			*_pos = UINT_MAX;
 			return NULL;
 		}
 		if (n == 0) {
 			if (bucket == 0)
 				return SEQ_START_TOKEN;
 			*_pos += 1;
 			n++;
 		}

 		p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
 		if (p)
 			return p;
 		bucket++;
 		n = 1;
 		*_pos = (bucket << shift) | n;
 	}
 }

 static void *rxrpc_peer_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	unsigned int bucket, n;
 	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
 	void *p;

 	if (*_pos >= UINT_MAX)
 		return NULL;

 	bucket = *_pos >> shift;

 	p = seq_hlist_next_rcu(v, &rxnet->peer_hash[bucket], _pos);
 	if (p)
 		return p;

 	for (;;) {
 		bucket++;
 		n = 1;
 		*_pos = (bucket << shift) | n;

 		if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
 			*_pos = UINT_MAX;
 			return NULL;
 		}
 		if (n == 0) {
 			*_pos += 1;
 			n++;
 		}

 		p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
 		if (p)
 			return p;
 	}
 }

 static void rxrpc_peer_seq_stop(struct seq_file *seq, void *v)
 	__releases(rcu)
 {
 	rcu_read_unlock();
 }


 const struct seq_operations rxrpc_peer_seq_ops = {
 	.start  = rxrpc_peer_seq_start,
 	.next   = rxrpc_peer_seq_next,
 	.stop   = rxrpc_peer_seq_stop,
 	.show   = rxrpc_peer_seq_show,
 };

 /*
  * Generate a list of extant virtual local endpoints in /proc/net/rxrpc/locals
  */
 static int rxrpc_local_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_local *local;
 	char lbuff[50];

 	if (v == SEQ_START_TOKEN) {
 		seq_puts(seq,
 			 "Proto Local                                          "
 			 " Use Act RxQ\n");
 		return 0;
 	}

 	local = hlist_entry(v, struct rxrpc_local, link);

 	sprintf(lbuff, "%pISpc", &local->srx.transport);

 	seq_printf(seq,
 		   "UDP   %-47.47s %3u %3u %3u\n",
 		   lbuff,
 		   refcount_read(&local->ref),
 		   atomic_read(&local->active_users),
 		   local->rx_queue.qlen);

 	return 0;
 }

 static void *rxrpc_local_seq_start(struct seq_file *seq, loff_t *_pos)
 	__acquires(rcu)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	unsigned int n;

 	rcu_read_lock();

 	if (*_pos >= UINT_MAX)
 		return NULL;

 	n = *_pos;
 	if (n == 0)
 		return SEQ_START_TOKEN;

 	return seq_hlist_start_rcu(&rxnet->local_endpoints, n - 1);
 }

 static void *rxrpc_local_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

 	if (*_pos >= UINT_MAX)
 		return NULL;

 	return seq_hlist_next_rcu(v, &rxnet->local_endpoints, _pos);
 }

 static void rxrpc_local_seq_stop(struct seq_file *seq, void *v)
 	__releases(rcu)
 {
 	rcu_read_unlock();
 }

 const struct seq_operations rxrpc_local_seq_ops = {
 	.start  = rxrpc_local_seq_start,
 	.next   = rxrpc_local_seq_next,
 	.stop   = rxrpc_local_seq_stop,
 	.show   = rxrpc_local_seq_show,
 };

 /*
  * Display stats in /proc/net/rxrpc/stats
  */
 int rxrpc_stats_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_single_net(seq));

 	seq_printf(seq,
 		   "Data     : send=%u sendf=%u fail=%u\n",
 		   atomic_read(&rxnet->stat_tx_data_send),
 		   atomic_read(&rxnet->stat_tx_data_send_frag),
 		   atomic_read(&rxnet->stat_tx_data_send_fail));
 	seq_printf(seq,
 		   "Data-Tx  : nr=%u retrans=%u uf=%u cwr=%u\n",
 		   atomic_read(&rxnet->stat_tx_data),
 		   atomic_read(&rxnet->stat_tx_data_retrans),
 		   atomic_read(&rxnet->stat_tx_data_underflow),
 		   atomic_read(&rxnet->stat_tx_data_cwnd_reset));
 	seq_printf(seq,
 		   "Data-Rx  : nr=%u reqack=%u jumbo=%u\n",
 		   atomic_read(&rxnet->stat_rx_data),
 		   atomic_read(&rxnet->stat_rx_data_reqack),
 		   atomic_read(&rxnet->stat_rx_data_jumbo));
 	seq_printf(seq,
 		   "Ack      : fill=%u send=%u skip=%u\n",
 		   atomic_read(&rxnet->stat_tx_ack_fill),
 		   atomic_read(&rxnet->stat_tx_ack_send),
 		   atomic_read(&rxnet->stat_tx_ack_skip));
 	seq_printf(seq,
 		   "Ack-Tx   : req=%u dup=%u oos=%u exw=%u nos=%u png=%u prs=%u dly=%u idl=%u\n",
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_REQUESTED]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_DUPLICATE]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_OUT_OF_SEQUENCE]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_EXCEEDS_WINDOW]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_NOSPACE]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_PING]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_PING_RESPONSE]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_DELAY]),
 		   atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_IDLE]));
 	seq_printf(seq,
 		   "Ack-Rx   : req=%u dup=%u oos=%u exw=%u nos=%u png=%u prs=%u dly=%u idl=%u\n",
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_REQUESTED]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_DUPLICATE]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_OUT_OF_SEQUENCE]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_EXCEEDS_WINDOW]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_NOSPACE]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_PING]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_PING_RESPONSE]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_DELAY]),
 		   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_IDLE]));
 	seq_printf(seq,
 		   "Why-Req-A: acklost=%u already=%u mrtt=%u ortt=%u\n",
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_ack_lost]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_already_on]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_more_rtt]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_old_rtt]));
 	seq_printf(seq,
 		   "Why-Req-A: nolast=%u retx=%u slows=%u smtxw=%u\n",
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_no_srv_last]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_retrans]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_slow_start]),
 		   atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_small_txwin]));
 	seq_printf(seq,
 		   "Buffers  : txb=%u rxb=%u\n",
 		   atomic_read(&rxrpc_nr_txbuf),
 		   atomic_read(&rxrpc_n_rx_skbs));
 	seq_printf(seq,
 		   "IO-thread: loops=%u\n",
 		   atomic_read(&rxnet->stat_io_loop));
 	return 0;
 }

 /*
  * Clear stats if /proc/net/rxrpc/stats is written to.
  */
 int rxrpc_stats_clear(struct file *file, char *buf, size_t size)
 {
 	struct seq_file *m = file->private_data;
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_single_net(m));

 	if (size > 1 || (size == 1 && buf[0] != '\n'))
 		return -EINVAL;

 	atomic_set(&rxnet->stat_tx_data, 0);
 	atomic_set(&rxnet->stat_tx_data_retrans, 0);
 	atomic_set(&rxnet->stat_tx_data_underflow, 0);
 	atomic_set(&rxnet->stat_tx_data_cwnd_reset, 0);
 	atomic_set(&rxnet->stat_tx_data_send, 0);
 	atomic_set(&rxnet->stat_tx_data_send_frag, 0);
 	atomic_set(&rxnet->stat_tx_data_send_fail, 0);
 	atomic_set(&rxnet->stat_rx_data, 0);
 	atomic_set(&rxnet->stat_rx_data_reqack, 0);
 	atomic_set(&rxnet->stat_rx_data_jumbo, 0);

 	atomic_set(&rxnet->stat_tx_ack_fill, 0);
 	atomic_set(&rxnet->stat_tx_ack_send, 0);
 	atomic_set(&rxnet->stat_tx_ack_skip, 0);
 	memset(&rxnet->stat_tx_acks, 0, sizeof(rxnet->stat_tx_acks));
 	memset(&rxnet->stat_rx_acks, 0, sizeof(rxnet->stat_rx_acks));

 	memset(&rxnet->stat_why_req_ack, 0, sizeof(rxnet->stat_why_req_ack));

 	atomic_set(&rxnet->stat_io_loop, 0);
 	return size;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/* /proc/net/ support for AF_RXRPC
	*
	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	* Written by David Howells (dhowells@redhat.com)
	*/

	#include <linux/module.h>
	#include <net/sock.h>
	#include <net/af_rxrpc.h>
	#include "ar-internal.h"

	static const char *const rxrpc_conn_states[RXRPC_CONN__NR_STATES] = {
	[RXRPC_CONN_UNUSED] = "Unused ",
	[RXRPC_CONN_CLIENT_UNSECURED] = "ClUnsec ",
	[RXRPC_CONN_CLIENT] = "Client ",
	[RXRPC_CONN_SERVICE_PREALLOC] = "SvPrealc",
	[RXRPC_CONN_SERVICE_UNSECURED] = "SvUnsec ",
	[RXRPC_CONN_SERVICE_CHALLENGING] = "SvChall ",
	[RXRPC_CONN_SERVICE] = "SvSecure",
	[RXRPC_CONN_ABORTED] = "Aborted ",
	};

	/*
	* generate a list of extant and dead calls in /proc/net/rxrpc_calls
	*/
	static void rxrpc_call_seq_start(struct seq_file seq, loff_t *_pos)
	__acquires(rcu)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	rcu_read_lock();
	return seq_list_start_head_rcu(&rxnet->calls, *_pos);
	}

	static void rxrpc_call_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	return seq_list_next_rcu(v, &rxnet->calls, pos);
	}

	static void rxrpc_call_seq_stop(struct seq_file seq, void v)
	__releases(rcu)
	{
	rcu_read_unlock();
	}

	static int rxrpc_call_seq_show(struct seq_file seq, void v)
	{
	struct rxrpc_local *local;
	struct rxrpc_call *call;
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
	enum rxrpc_call_state state;
	unsigned long timeout = 0;
	rxrpc_seq_t acks_hard_ack;
	char lbuff[50], rbuff[50];

	if (v == &rxnet->calls) {
	seq_puts(seq,
	"Proto Local "
	" Remote "
	" SvID ConnID CallID End Use State Abort "
	" DebugId TxSeq TW RxSeq RW RxSerial CW RxTimo\n");
	return 0;
	}

	call = list_entry(v, struct rxrpc_call, link);

	local = call->local;
	if (local)
	sprintf(lbuff, "%pISpc", &local->srx.transport);
	else
	strcpy(lbuff, "no_local");

	sprintf(rbuff, "%pISpc", &call->dest_srx.transport);

	state = rxrpc_call_state(call);
	if (state != RXRPC_CALL_SERVER_PREALLOC) {
	timeout = READ_ONCE(call->expect_rx_by);
	timeout -= jiffies;
	}

	acks_hard_ack = READ_ONCE(call->acks_hard_ack);
	seq_printf(seq,
	"UDP %-47.47s %-47.47s %4x %08x %08x %s %3u"
	" %-8.8s %08x %08x %08x %02x %08x %02x %08x %02x %06lx\n",
	lbuff,
	rbuff,
	call->dest_srx.srx_service,
	call->cid,
	call->call_id,
	rxrpc_is_service_call(call) ? "Svc" : "Clt",
	refcount_read(&call->ref),
	rxrpc_call_states[state],
	call->abort_code,
	call->debug_id,
	acks_hard_ack, READ_ONCE(call->tx_top) - acks_hard_ack,
	call->ackr_window, call->ackr_wtop - call->ackr_window,
	call->rx_serial,
	call->cong_cwnd,
	timeout);

	return 0;
	}

	const struct seq_operations rxrpc_call_seq_ops = {
	.start = rxrpc_call_seq_start,
	.next = rxrpc_call_seq_next,
	.stop = rxrpc_call_seq_stop,
	.show = rxrpc_call_seq_show,
	};

	/*
	* generate a list of extant virtual connections in /proc/net/rxrpc_conns
	*/
	static void rxrpc_connection_seq_start(struct seq_file seq, loff_t *_pos)
	__acquires(rxnet->conn_lock)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	read_lock(&rxnet->conn_lock);
	return seq_list_start_head(&rxnet->conn_proc_list, *_pos);
	}

	static void rxrpc_connection_seq_next(struct seq_file seq, void *v,
	loff_t *pos)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	return seq_list_next(v, &rxnet->conn_proc_list, pos);
	}

	static void rxrpc_connection_seq_stop(struct seq_file seq, void v)
	__releases(rxnet->conn_lock)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	read_unlock(&rxnet->conn_lock);
	}

	static int rxrpc_connection_seq_show(struct seq_file seq, void v)
	{
	struct rxrpc_connection *conn;
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
	const char *state;
	char lbuff[50], rbuff[50];

	if (v == &rxnet->conn_proc_list) {
	seq_puts(seq,
	"Proto Local "
	" Remote "
	" SvID ConnID End Ref Act State Key "
	" Serial ISerial CallId0 CallId1 CallId2 CallId3\n"
	);
	return 0;
	}

	conn = list_entry(v, struct rxrpc_connection, proc_link);
	if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) {
	strcpy(lbuff, "no_local");
	strcpy(rbuff, "no_connection");
	goto print;
	}

	sprintf(lbuff, "%pISpc", &conn->local->srx.transport);
	sprintf(rbuff, "%pISpc", &conn->peer->srx.transport);
	print:
	state = rxrpc_is_conn_aborted(conn) ?
	rxrpc_call_completions[conn->completion] :
	rxrpc_conn_states[conn->state];
	seq_printf(seq,
	"UDP %-47.47s %-47.47s %4x %08x %s %3u %3d"
	" %s %08x %08x %08x %08x %08x %08x %08x\n",
	lbuff,
	rbuff,
	conn->service_id,
	conn->proto.cid,
	rxrpc_conn_is_service(conn) ? "Svc" : "Clt",
	refcount_read(&conn->ref),
	atomic_read(&conn->active),
	state,
	key_serial(conn->key),
	atomic_read(&conn->serial),
	conn->hi_serial,
	conn->channels[0].call_id,
	conn->channels[1].call_id,
	conn->channels[2].call_id,
	conn->channels[3].call_id);

	return 0;
	}

	const struct seq_operations rxrpc_connection_seq_ops = {
	.start = rxrpc_connection_seq_start,
	.next = rxrpc_connection_seq_next,
	.stop = rxrpc_connection_seq_stop,
	.show = rxrpc_connection_seq_show,
	};

	/*
	* generate a list of extant virtual peers in /proc/net/rxrpc/peers
	*/
	static int rxrpc_peer_seq_show(struct seq_file seq, void v)
	{
	struct rxrpc_peer *peer;
	time64_t now;
	char lbuff[50], rbuff[50];

	if (v == SEQ_START_TOKEN) {
	seq_puts(seq,
	"Proto Local "
	" Remote "
	" Use SST MTU LastUse RTT RTO\n"
	);
	return 0;
	}

	peer = list_entry(v, struct rxrpc_peer, hash_link);

	sprintf(lbuff, "%pISpc", &peer->local->srx.transport);

	sprintf(rbuff, "%pISpc", &peer->srx.transport);

	now = ktime_get_seconds();
	seq_printf(seq,
	"UDP %-47.47s %-47.47s %3u"
	" %3u %5u %6llus %8u %8u\n",
	lbuff,
	rbuff,
	refcount_read(&peer->ref),
	peer->cong_ssthresh,
	peer->mtu,
	now - peer->last_tx_at,
	peer->srtt_us >> 3,
	jiffies_to_usecs(peer->rto_j));

	return 0;
	}

	static void rxrpc_peer_seq_start(struct seq_file seq, loff_t *_pos)
	__acquires(rcu)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
	unsigned int bucket, n;
	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
	void *p;

	rcu_read_lock();

	if (*_pos >= UINT_MAX)
	return NULL;

	n = *_pos & ((1U << shift) - 1);
	bucket = *_pos >> shift;
	for (;;) {
	if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
	*_pos = UINT_MAX;
	return NULL;
	}
	if (n == 0) {
	if (bucket == 0)
	return SEQ_START_TOKEN;
	*_pos += 1;
	n++;
	}

	p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
	if (p)
	return p;
	bucket++;
	n = 1;
	*_pos = (bucket << shift) \| n;
	}
	}

	static void rxrpc_peer_seq_next(struct seq_file seq, void v, loff_t _pos)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
	unsigned int bucket, n;
	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
	void *p;

	if (*_pos >= UINT_MAX)
	return NULL;

	bucket = *_pos >> shift;

	p = seq_hlist_next_rcu(v, &rxnet->peer_hash[bucket], _pos);
	if (p)
	return p;

	for (;;) {
	bucket++;
	n = 1;
	*_pos = (bucket << shift) \| n;

	if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
	*_pos = UINT_MAX;
	return NULL;
	}
	if (n == 0) {
	*_pos += 1;
	n++;
	}

	p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
	if (p)
	return p;
	}
	}

	static void rxrpc_peer_seq_stop(struct seq_file seq, void v)
	__releases(rcu)
	{
	rcu_read_unlock();
	}


	const struct seq_operations rxrpc_peer_seq_ops = {
	.start = rxrpc_peer_seq_start,
	.next = rxrpc_peer_seq_next,
	.stop = rxrpc_peer_seq_stop,
	.show = rxrpc_peer_seq_show,
	};

	/*
	* Generate a list of extant virtual local endpoints in /proc/net/rxrpc/locals
	*/
	static int rxrpc_local_seq_show(struct seq_file seq, void v)
	{
	struct rxrpc_local *local;
	char lbuff[50];

	if (v == SEQ_START_TOKEN) {
	seq_puts(seq,
	"Proto Local "
	" Use Act RxQ\n");
	return 0;
	}

	local = hlist_entry(v, struct rxrpc_local, link);

	sprintf(lbuff, "%pISpc", &local->srx.transport);

	seq_printf(seq,
	"UDP %-47.47s %3u %3u %3u\n",
	lbuff,
	refcount_read(&local->ref),
	atomic_read(&local->active_users),
	local->rx_queue.qlen);

	return 0;
	}

	static void rxrpc_local_seq_start(struct seq_file seq, loff_t *_pos)
	__acquires(rcu)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
	unsigned int n;

	rcu_read_lock();

	if (*_pos >= UINT_MAX)
	return NULL;

	n = *_pos;
	if (n == 0)
	return SEQ_START_TOKEN;

	return seq_hlist_start_rcu(&rxnet->local_endpoints, n - 1);
	}

	static void rxrpc_local_seq_next(struct seq_file seq, void v, loff_t _pos)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	if (*_pos >= UINT_MAX)
	return NULL;

	return seq_hlist_next_rcu(v, &rxnet->local_endpoints, _pos);
	}

	static void rxrpc_local_seq_stop(struct seq_file seq, void v)
	__releases(rcu)
	{
	rcu_read_unlock();
	}

	const struct seq_operations rxrpc_local_seq_ops = {
	.start = rxrpc_local_seq_start,
	.next = rxrpc_local_seq_next,
	.stop = rxrpc_local_seq_stop,
	.show = rxrpc_local_seq_show,
	};

	/*
	* Display stats in /proc/net/rxrpc/stats
	*/
	int rxrpc_stats_show(struct seq_file seq, void v)
	{
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_single_net(seq));

	seq_printf(seq,
	"Data : send=%u sendf=%u fail=%u\n",
	atomic_read(&rxnet->stat_tx_data_send),
	atomic_read(&rxnet->stat_tx_data_send_frag),
	atomic_read(&rxnet->stat_tx_data_send_fail));
	seq_printf(seq,
	"Data-Tx : nr=%u retrans=%u uf=%u cwr=%u\n",
	atomic_read(&rxnet->stat_tx_data),
	atomic_read(&rxnet->stat_tx_data_retrans),
	atomic_read(&rxnet->stat_tx_data_underflow),
	atomic_read(&rxnet->stat_tx_data_cwnd_reset));
	seq_printf(seq,
	"Data-Rx : nr=%u reqack=%u jumbo=%u\n",
	atomic_read(&rxnet->stat_rx_data),
	atomic_read(&rxnet->stat_rx_data_reqack),
	atomic_read(&rxnet->stat_rx_data_jumbo));
	seq_printf(seq,
	"Ack : fill=%u send=%u skip=%u\n",
	atomic_read(&rxnet->stat_tx_ack_fill),
	atomic_read(&rxnet->stat_tx_ack_send),
	atomic_read(&rxnet->stat_tx_ack_skip));
	seq_printf(seq,
	"Ack-Tx : req=%u dup=%u oos=%u exw=%u nos=%u png=%u prs=%u dly=%u idl=%u\n",
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_REQUESTED]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_DUPLICATE]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_OUT_OF_SEQUENCE]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_EXCEEDS_WINDOW]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_NOSPACE]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_PING]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_PING_RESPONSE]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_DELAY]),
	atomic_read(&rxnet->stat_tx_acks[RXRPC_ACK_IDLE]));
	seq_printf(seq,
	"Ack-Rx : req=%u dup=%u oos=%u exw=%u nos=%u png=%u prs=%u dly=%u idl=%u\n",
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_REQUESTED]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_DUPLICATE]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_OUT_OF_SEQUENCE]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_EXCEEDS_WINDOW]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_NOSPACE]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_PING]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_PING_RESPONSE]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_DELAY]),
	atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_IDLE]));
	seq_printf(seq,
	"Why-Req-A: acklost=%u already=%u mrtt=%u ortt=%u\n",
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_ack_lost]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_already_on]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_more_rtt]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_old_rtt]));
	seq_printf(seq,
	"Why-Req-A: nolast=%u retx=%u slows=%u smtxw=%u\n",
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_no_srv_last]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_retrans]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_slow_start]),
	atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_small_txwin]));
	seq_printf(seq,
	"Buffers : txb=%u rxb=%u\n",
	atomic_read(&rxrpc_nr_txbuf),
	atomic_read(&rxrpc_n_rx_skbs));
	seq_printf(seq,
	"IO-thread: loops=%u\n",
	atomic_read(&rxnet->stat_io_loop));
	return 0;
	}

	/*
	* Clear stats if /proc/net/rxrpc/stats is written to.
	*/
	int rxrpc_stats_clear(struct file file, char buf, size_t size)
	{
	struct seq_file *m = file->private_data;
	struct rxrpc_net *rxnet = rxrpc_net(seq_file_single_net(m));

	if (size > 1 \|\| (size == 1 && buf[0] != '\n'))
	return -EINVAL;

	atomic_set(&rxnet->stat_tx_data, 0);
	atomic_set(&rxnet->stat_tx_data_retrans, 0);
	atomic_set(&rxnet->stat_tx_data_underflow, 0);
	atomic_set(&rxnet->stat_tx_data_cwnd_reset, 0);
	atomic_set(&rxnet->stat_tx_data_send, 0);
	atomic_set(&rxnet->stat_tx_data_send_frag, 0);
	atomic_set(&rxnet->stat_tx_data_send_fail, 0);
	atomic_set(&rxnet->stat_rx_data, 0);
	atomic_set(&rxnet->stat_rx_data_reqack, 0);
	atomic_set(&rxnet->stat_rx_data_jumbo, 0);

	atomic_set(&rxnet->stat_tx_ack_fill, 0);
	atomic_set(&rxnet->stat_tx_ack_send, 0);
	atomic_set(&rxnet->stat_tx_ack_skip, 0);
	memset(&rxnet->stat_tx_acks, 0, sizeof(rxnet->stat_tx_acks));
	memset(&rxnet->stat_rx_acks, 0, sizeof(rxnet->stat_rx_acks));

	memset(&rxnet->stat_why_req_ack, 0, sizeof(rxnet->stat_why_req_ack));

	atomic_set(&rxnet->stat_io_loop, 0);
	return size;
	}