net/rxrpc/proc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* /proc/net/ support for AF_RXRPC
   3  *
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <net/sock.h>
  10 #include <net/af_rxrpc.h>
  11 #include "ar-internal.h"
  12
  13 static const char *const rxrpc_conn_states[RXRPC_CONN__NR_STATES] = {
  14         [RXRPC_CONN_UNUSED]                     = "Unused  ",
  15         [RXRPC_CONN_CLIENT]                     = "Client  ",
  16         [RXRPC_CONN_SERVICE_PREALLOC]           = "SvPrealc",
  17         [RXRPC_CONN_SERVICE_UNSECURED]          = "SvUnsec ",
  18         [RXRPC_CONN_SERVICE_CHALLENGING]        = "SvChall ",
  19         [RXRPC_CONN_SERVICE]                    = "SvSecure",
  20         [RXRPC_CONN_REMOTELY_ABORTED]           = "RmtAbort",
  21         [RXRPC_CONN_LOCALLY_ABORTED]            = "LocAbort",
  22 };
  23
  24 /*
  25  * generate a list of extant and dead calls in /proc/net/rxrpc_calls
  26  */
  27 static void *rxrpc_call_seq_start(struct seq_file *seq, loff_t *_pos)
  28         __acquires(rcu)
  29 {
  30         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
  31
  32         rcu_read_lock();
  33         return seq_list_start_head_rcu(&rxnet->calls, *_pos);
  34 }
  35
  36 static void *rxrpc_call_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  37 {
  38         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
  39
  40         return seq_list_next_rcu(v, &rxnet->calls, pos);
  41 }
  42
  43 static void rxrpc_call_seq_stop(struct seq_file *seq, void *v)
  44         __releases(rcu)
  45 {
  46         rcu_read_unlock();
  47 }
  48
  49 static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
  50 {
  51         struct rxrpc_local *local;
  52         struct rxrpc_sock *rx;
  53         struct rxrpc_peer *peer;
  54         struct rxrpc_call *call;
  55         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
  56         unsigned long timeout = 0;
  57         rxrpc_seq_t tx_hard_ack, rx_hard_ack;
  58         char lbuff[50], rbuff[50];
  59
  60         if (v == &rxnet->calls) {
  61                 seq_puts(seq,
  62                          "Proto Local                                          "
  63                          " Remote                                         "
  64                          " SvID ConnID   CallID   End Use State    Abort   "
  65                          " DebugId  TxSeq    TW RxSeq    RW RxSerial RxTimo\n");
  66                 return 0;
  67         }
  68
  69         call = list_entry(v, struct rxrpc_call, link);
  70
  71         rx = rcu_dereference(call->socket);
  72         if (rx) {
  73                 local = READ_ONCE(rx->local);
  74                 if (local)
  75                         sprintf(lbuff, "%pISpc", &local->srx.transport);
  76                 else
  77                         strcpy(lbuff, "no_local");
  78         } else {
  79                 strcpy(lbuff, "no_socket");
  80         }
  81
  82         peer = call->peer;
  83         if (peer)
  84                 sprintf(rbuff, "%pISpc", &peer->srx.transport);
  85         else
  86                 strcpy(rbuff, "no_connection");
  87
  88         if (call->state != RXRPC_CALL_SERVER_PREALLOC) {
  89                 timeout = READ_ONCE(call->expect_rx_by);
  90                 timeout -= jiffies;
  91         }
  92
  93         tx_hard_ack = READ_ONCE(call->tx_hard_ack);
  94         rx_hard_ack = READ_ONCE(call->rx_hard_ack);
  95         seq_printf(seq,
  96                    "UDP   %-47.47s %-47.47s %4x %08x %08x %s %3u"
  97                    " %-8.8s %08x %08x %08x %02x %08x %02x %08x %06lx\n",
  98                    lbuff,
  99                    rbuff,
 100                    call->service_id,
 101                    call->cid,
 102                    call->call_id,
 103                    rxrpc_is_service_call(call) ? "Svc" : "Clt",
 104                    refcount_read(&call->ref),
 105                    rxrpc_call_states[call->state],
 106                    call->abort_code,
 107                    call->debug_id,
 108                    tx_hard_ack, READ_ONCE(call->tx_top) - tx_hard_ack,
 109                    rx_hard_ack, READ_ONCE(call->rx_top) - rx_hard_ack,
 110                    call->rx_serial,
 111                    timeout);
 112
 113         return 0;
 114 }
 115
 116 const struct seq_operations rxrpc_call_seq_ops = {
 117         .start  = rxrpc_call_seq_start,
 118         .next   = rxrpc_call_seq_next,
 119         .stop   = rxrpc_call_seq_stop,
 120         .show   = rxrpc_call_seq_show,
 121 };
 122
 123 /*
 124  * generate a list of extant virtual connections in /proc/net/rxrpc_conns
 125  */
 126 static void *rxrpc_connection_seq_start(struct seq_file *seq, loff_t *_pos)
 127         __acquires(rxnet->conn_lock)
 128 {
 129         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 130
 131         read_lock(&rxnet->conn_lock);
 132         return seq_list_start_head(&rxnet->conn_proc_list, *_pos);
 133 }
 134
 135 static void *rxrpc_connection_seq_next(struct seq_file *seq, void *v,
 136                                        loff_t *pos)
 137 {
 138         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 139
 140         return seq_list_next(v, &rxnet->conn_proc_list, pos);
 141 }
 142
 143 static void rxrpc_connection_seq_stop(struct seq_file *seq, void *v)
 144         __releases(rxnet->conn_lock)
 145 {
 146         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 147
 148         read_unlock(&rxnet->conn_lock);
 149 }
 150
 151 static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
 152 {
 153         struct rxrpc_connection *conn;
 154         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 155         char lbuff[50], rbuff[50];
 156
 157         if (v == &rxnet->conn_proc_list) {
 158                 seq_puts(seq,
 159                          "Proto Local                                          "
 160                          " Remote                                         "
 161                          " SvID ConnID   End Use State    Key     "
 162                          " Serial   ISerial  CallId0  CallId1  CallId2  CallId3\n"
 163                          );
 164                 return 0;
 165         }
 166
 167         conn = list_entry(v, struct rxrpc_connection, proc_link);
 168         if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) {
 169                 strcpy(lbuff, "no_local");
 170                 strcpy(rbuff, "no_connection");
 171                 goto print;
 172         }
 173
 174         sprintf(lbuff, "%pISpc", &conn->params.local->srx.transport);
 175
 176         sprintf(rbuff, "%pISpc", &conn->params.peer->srx.transport);
 177 print:
 178         seq_printf(seq,
 179                    "UDP   %-47.47s %-47.47s %4x %08x %s %3u"
 180                    " %s %08x %08x %08x %08x %08x %08x %08x\n",
 181                    lbuff,
 182                    rbuff,
 183                    conn->service_id,
 184                    conn->proto.cid,
 185                    rxrpc_conn_is_service(conn) ? "Svc" : "Clt",
 186                    refcount_read(&conn->ref),
 187                    rxrpc_conn_states[conn->state],
 188                    key_serial(conn->params.key),
 189                    atomic_read(&conn->serial),
 190                    conn->hi_serial,
 191                    conn->channels[0].call_id,
 192                    conn->channels[1].call_id,
 193                    conn->channels[2].call_id,
 194                    conn->channels[3].call_id);
 195
 196         return 0;
 197 }
 198
 199 const struct seq_operations rxrpc_connection_seq_ops = {
 200         .start  = rxrpc_connection_seq_start,
 201         .next   = rxrpc_connection_seq_next,
 202         .stop   = rxrpc_connection_seq_stop,
 203         .show   = rxrpc_connection_seq_show,
 204 };
 205
 206 /*
 207  * generate a list of extant virtual peers in /proc/net/rxrpc/peers
 208  */
 209 static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
 210 {
 211         struct rxrpc_peer *peer;
 212         time64_t now;
 213         char lbuff[50], rbuff[50];
 214
 215         if (v == SEQ_START_TOKEN) {
 216                 seq_puts(seq,
 217                          "Proto Local                                          "
 218                          " Remote                                         "
 219                          " Use  CW   MTU LastUse      RTT      RTO\n"
 220                          );
 221                 return 0;
 222         }
 223
 224         peer = list_entry(v, struct rxrpc_peer, hash_link);
 225
 226         sprintf(lbuff, "%pISpc", &peer->local->srx.transport);
 227
 228         sprintf(rbuff, "%pISpc", &peer->srx.transport);
 229
 230         now = ktime_get_seconds();
 231         seq_printf(seq,
 232                    "UDP   %-47.47s %-47.47s %3u"
 233                    " %3u %5u %6llus %8u %8u\n",
 234                    lbuff,
 235                    rbuff,
 236                    refcount_read(&peer->ref),
 237                    peer->cong_cwnd,
 238                    peer->mtu,
 239                    now - peer->last_tx_at,
 240                    peer->srtt_us >> 3,
 241                    jiffies_to_usecs(peer->rto_j));
 242
 243         return 0;
 244 }
 245
 246 static void *rxrpc_peer_seq_start(struct seq_file *seq, loff_t *_pos)
 247         __acquires(rcu)
 248 {
 249         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 250         unsigned int bucket, n;
 251         unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
 252         void *p;
 253
 254         rcu_read_lock();
 255
 256         if (*_pos >= UINT_MAX)
 257                 return NULL;
 258
 259         n = *_pos & ((1U << shift) - 1);
 260         bucket = *_pos >> shift;
 261         for (;;) {
 262                 if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
 263                         *_pos = UINT_MAX;
 264                         return NULL;
 265                 }
 266                 if (n == 0) {
 267                         if (bucket == 0)
 268                                 return SEQ_START_TOKEN;
 269                         *_pos += 1;
 270                         n++;
 271                 }
 272
 273                 p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
 274                 if (p)
 275                         return p;
 276                 bucket++;
 277                 n = 1;
 278                 *_pos = (bucket << shift) | n;
 279         }
 280 }
 281
 282 static void *rxrpc_peer_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
 283 {
 284         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 285         unsigned int bucket, n;
 286         unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
 287         void *p;
 288
 289         if (*_pos >= UINT_MAX)
 290                 return NULL;
 291
 292         bucket = *_pos >> shift;
 293
 294         p = seq_hlist_next_rcu(v, &rxnet->peer_hash[bucket], _pos);
 295         if (p)
 296                 return p;
 297
 298         for (;;) {
 299                 bucket++;
 300                 n = 1;
 301                 *_pos = (bucket << shift) | n;
 302
 303                 if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
 304                         *_pos = UINT_MAX;
 305                         return NULL;
 306                 }
 307                 if (n == 0) {
 308                         *_pos += 1;
 309                         n++;
 310                 }
 311
 312                 p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
 313                 if (p)
 314                         return p;
 315         }
 316 }
 317
 318 static void rxrpc_peer_seq_stop(struct seq_file *seq, void *v)
 319         __releases(rcu)
 320 {
 321         rcu_read_unlock();
 322 }
 323
 324
 325 const struct seq_operations rxrpc_peer_seq_ops = {
 326         .start  = rxrpc_peer_seq_start,
 327         .next   = rxrpc_peer_seq_next,
 328         .stop   = rxrpc_peer_seq_stop,
 329         .show   = rxrpc_peer_seq_show,
 330 };
 331
 332 /*
 333  * Generate a list of extant virtual local endpoints in /proc/net/rxrpc/locals
 334  */
 335 static int rxrpc_local_seq_show(struct seq_file *seq, void *v)
 336 {
 337         struct rxrpc_local *local;
 338         char lbuff[50];
 339
 340         if (v == SEQ_START_TOKEN) {
 341                 seq_puts(seq,
 342                          "Proto Local                                          "
 343                          " Use Act\n");
 344                 return 0;
 345         }
 346
 347         local = hlist_entry(v, struct rxrpc_local, link);
 348
 349         sprintf(lbuff, "%pISpc", &local->srx.transport);
 350
 351         seq_printf(seq,
 352                    "UDP   %-47.47s %3u %3u\n",
 353                    lbuff,
 354                    refcount_read(&local->ref),
 355                    atomic_read(&local->active_users));
 356
 357         return 0;
 358 }
 359
 360 static void *rxrpc_local_seq_start(struct seq_file *seq, loff_t *_pos)
 361         __acquires(rcu)
 362 {
 363         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 364         unsigned int n;
 365
 366         rcu_read_lock();
 367
 368         if (*_pos >= UINT_MAX)
 369                 return NULL;
 370
 371         n = *_pos;
 372         if (n == 0)
 373                 return SEQ_START_TOKEN;
 374
 375         return seq_hlist_start_rcu(&rxnet->local_endpoints, n - 1);
 376 }
 377
 378 static void *rxrpc_local_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
 379 {
 380         struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 381
 382         if (*_pos >= UINT_MAX)
 383                 return NULL;
 384
 385         return seq_hlist_next_rcu(v, &rxnet->local_endpoints, _pos);
 386 }
 387
 388 static void rxrpc_local_seq_stop(struct seq_file *seq, void *v)
 389         __releases(rcu)
 390 {
 391         rcu_read_unlock();
 392 }
 393
 394 const struct seq_operations rxrpc_local_seq_ops = {
 395         .start  = rxrpc_local_seq_start,
 396         .next   = rxrpc_local_seq_next,
 397         .stop   = rxrpc_local_seq_stop,
 398         .show   = rxrpc_local_seq_show,
 399 };