1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/netdevice.h> 3 #include <linux/proc_fs.h> 4 #include <linux/seq_file.h> 5 #include <net/wext.h> 6 #include <net/hotdata.h> 7 8 #include "dev.h" 9 10 static void *dev_seq_from_index(struct seq_file *seq, loff_t *pos) 11 { 12 unsigned long ifindex = *pos; 13 struct net_device *dev; 14 15 for_each_netdev_dump(seq_file_net(seq), dev, ifindex) { 16 *pos = dev->ifindex; 17 return dev; 18 } 19 return NULL; 20 } 21 22 static void *dev_seq_start(struct seq_file *seq, loff_t *pos) 23 __acquires(RCU) 24 { 25 rcu_read_lock(); 26 if (!*pos) 27 return SEQ_START_TOKEN; 28 29 return dev_seq_from_index(seq, pos); 30 } 31 32 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) 33 { 34 ++*pos; 35 return dev_seq_from_index(seq, pos); 36 } 37 38 static void dev_seq_stop(struct seq_file *seq, void *v) 39 __releases(RCU) 40 { 41 rcu_read_unlock(); 42 } 43 44 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) 45 { 46 struct rtnl_link_stats64 temp; 47 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 48 49 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " 50 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n", 51 dev->name, stats->rx_bytes, stats->rx_packets, 52 stats->rx_errors, 53 stats->rx_dropped + stats->rx_missed_errors, 54 stats->rx_fifo_errors, 55 stats->rx_length_errors + stats->rx_over_errors + 56 stats->rx_crc_errors + stats->rx_frame_errors, 57 stats->rx_compressed, stats->multicast, 58 stats->tx_bytes, stats->tx_packets, 59 stats->tx_errors, stats->tx_dropped, 60 stats->tx_fifo_errors, stats->collisions, 61 stats->tx_carrier_errors + 62 stats->tx_aborted_errors + 63 stats->tx_window_errors + 64 stats->tx_heartbeat_errors, 65 stats->tx_compressed); 66 } 67 68 /* 69 * Called from the PROCfs module. This now uses the new arbitrary sized 70 * /proc/net interface to create /proc/net/dev 71 */ 72 static int dev_seq_show(struct seq_file *seq, void *v) 73 { 74 if (v == SEQ_START_TOKEN) 75 seq_puts(seq, "Inter-| Receive " 76 " | Transmit\n" 77 " face |bytes packets errs drop fifo frame " 78 "compressed multicast|bytes packets errs " 79 "drop fifo colls carrier compressed\n"); 80 else 81 dev_seq_printf_stats(seq, v); 82 return 0; 83 } 84 85 static u32 softnet_input_pkt_queue_len(struct softnet_data *sd) 86 { 87 return skb_queue_len_lockless(&sd->input_pkt_queue); 88 } 89 90 static u32 softnet_process_queue_len(struct softnet_data *sd) 91 { 92 return skb_queue_len_lockless(&sd->process_queue); 93 } 94 95 static struct softnet_data *softnet_get_online(loff_t *pos) 96 { 97 struct softnet_data *sd = NULL; 98 99 while (*pos < nr_cpu_ids) 100 if (cpu_online(*pos)) { 101 sd = &per_cpu(softnet_data, *pos); 102 break; 103 } else 104 ++*pos; 105 return sd; 106 } 107 108 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 109 { 110 return softnet_get_online(pos); 111 } 112 113 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 114 { 115 ++*pos; 116 return softnet_get_online(pos); 117 } 118 119 static void softnet_seq_stop(struct seq_file *seq, void *v) 120 { 121 } 122 123 static int softnet_seq_show(struct seq_file *seq, void *v) 124 { 125 struct softnet_data *sd = v; 126 u32 input_qlen = softnet_input_pkt_queue_len(sd); 127 u32 process_qlen = softnet_process_queue_len(sd); 128 unsigned int flow_limit_count = 0; 129 130 #ifdef CONFIG_NET_FLOW_LIMIT 131 struct sd_flow_limit *fl; 132 133 rcu_read_lock(); 134 fl = rcu_dereference(sd->flow_limit); 135 /* Pairs with WRITE_ONCE() in skb_flow_limit() */ 136 if (fl) 137 flow_limit_count = READ_ONCE(fl->count); 138 rcu_read_unlock(); 139 #endif 140 141 /* the index is the CPU id owing this sd. Since offline CPUs are not 142 * displayed, it would be othrwise not trivial for the user-space 143 * mapping the data a specific CPU 144 */ 145 seq_printf(seq, 146 "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x " 147 "%08x %08x\n", 148 READ_ONCE(sd->processed), 149 numa_drop_read(&sd->drop_counters), 150 READ_ONCE(sd->time_squeeze), 0, 151 0, 0, 0, 0, /* was fastroute */ 152 0, /* was cpu_collision */ 153 READ_ONCE(sd->received_rps), flow_limit_count, 154 input_qlen + process_qlen, (int)seq->index, 155 input_qlen, process_qlen); 156 return 0; 157 } 158 159 static const struct seq_operations dev_seq_ops = { 160 .start = dev_seq_start, 161 .next = dev_seq_next, 162 .stop = dev_seq_stop, 163 .show = dev_seq_show, 164 }; 165 166 static const struct seq_operations softnet_seq_ops = { 167 .start = softnet_seq_start, 168 .next = softnet_seq_next, 169 .stop = softnet_seq_stop, 170 .show = softnet_seq_show, 171 }; 172 173 static void *ptype_get_idx(struct seq_file *seq, loff_t pos) 174 { 175 struct list_head *ptype_list = NULL; 176 struct packet_type *pt = NULL; 177 struct net_device *dev; 178 loff_t i = 0; 179 int t; 180 181 for_each_netdev_rcu(seq_file_net(seq), dev) { 182 ptype_list = &dev->ptype_all; 183 list_for_each_entry_rcu(pt, ptype_list, list) { 184 if (i == pos) 185 return pt; 186 ++i; 187 } 188 } 189 190 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) { 191 if (i == pos) 192 return pt; 193 ++i; 194 } 195 196 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) { 197 if (i == pos) 198 return pt; 199 ++i; 200 } 201 202 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 203 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 204 if (i == pos) 205 return pt; 206 ++i; 207 } 208 } 209 return NULL; 210 } 211 212 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 213 __acquires(RCU) 214 { 215 rcu_read_lock(); 216 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 217 } 218 219 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 220 { 221 struct net *net = seq_file_net(seq); 222 struct net_device *dev; 223 struct packet_type *pt; 224 struct list_head *nxt; 225 int hash; 226 227 ++*pos; 228 if (v == SEQ_START_TOKEN) 229 return ptype_get_idx(seq, 0); 230 231 pt = v; 232 nxt = pt->list.next; 233 if (pt->dev) { 234 if (nxt != &pt->dev->ptype_all) 235 goto found; 236 237 dev = pt->dev; 238 for_each_netdev_continue_rcu(seq_file_net(seq), dev) { 239 if (!list_empty(&dev->ptype_all)) { 240 nxt = dev->ptype_all.next; 241 goto found; 242 } 243 } 244 nxt = net->ptype_all.next; 245 goto net_ptype_all; 246 } 247 248 if (pt->af_packet_net) { 249 net_ptype_all: 250 if (nxt != &net->ptype_all && nxt != &net->ptype_specific) 251 goto found; 252 253 if (nxt == &net->ptype_all) { 254 /* continue with ->ptype_specific if it's not empty */ 255 nxt = net->ptype_specific.next; 256 if (nxt != &net->ptype_specific) 257 goto found; 258 } 259 260 hash = 0; 261 nxt = ptype_base[0].next; 262 } else 263 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 264 265 while (nxt == &ptype_base[hash]) { 266 if (++hash >= PTYPE_HASH_SIZE) 267 return NULL; 268 nxt = ptype_base[hash].next; 269 } 270 found: 271 return list_entry(nxt, struct packet_type, list); 272 } 273 274 static void ptype_seq_stop(struct seq_file *seq, void *v) 275 __releases(RCU) 276 { 277 rcu_read_unlock(); 278 } 279 280 static int ptype_seq_show(struct seq_file *seq, void *v) 281 { 282 struct packet_type *pt = v; 283 284 if (v == SEQ_START_TOKEN) 285 seq_puts(seq, "Type Device Function\n"); 286 else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) && 287 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) { 288 if (pt->type == htons(ETH_P_ALL)) 289 seq_puts(seq, "ALL "); 290 else 291 seq_printf(seq, "%04x", ntohs(pt->type)); 292 293 seq_printf(seq, " %-8s %ps\n", 294 pt->dev ? pt->dev->name : "", pt->func); 295 } 296 297 return 0; 298 } 299 300 static const struct seq_operations ptype_seq_ops = { 301 .start = ptype_seq_start, 302 .next = ptype_seq_next, 303 .stop = ptype_seq_stop, 304 .show = ptype_seq_show, 305 }; 306 307 static int __net_init dev_proc_net_init(struct net *net) 308 { 309 int rc = -ENOMEM; 310 311 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 312 sizeof(struct seq_net_private))) 313 goto out; 314 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 315 &softnet_seq_ops)) 316 goto out_dev; 317 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 318 sizeof(struct seq_net_private))) 319 goto out_softnet; 320 321 if (wext_proc_init(net)) 322 goto out_ptype; 323 rc = 0; 324 out: 325 return rc; 326 out_ptype: 327 remove_proc_entry("ptype", net->proc_net); 328 out_softnet: 329 remove_proc_entry("softnet_stat", net->proc_net); 330 out_dev: 331 remove_proc_entry("dev", net->proc_net); 332 goto out; 333 } 334 335 static void __net_exit dev_proc_net_exit(struct net *net) 336 { 337 wext_proc_exit(net); 338 339 remove_proc_entry("ptype", net->proc_net); 340 remove_proc_entry("softnet_stat", net->proc_net); 341 remove_proc_entry("dev", net->proc_net); 342 } 343 344 static struct pernet_operations __net_initdata dev_proc_ops = { 345 .init = dev_proc_net_init, 346 .exit = dev_proc_net_exit, 347 }; 348 349 static int dev_mc_seq_show(struct seq_file *seq, void *v) 350 { 351 struct netdev_hw_addr *ha; 352 struct net_device *dev = v; 353 354 if (v == SEQ_START_TOKEN) 355 return 0; 356 357 netif_addr_lock_bh(dev); 358 netdev_for_each_mc_addr(ha, dev) { 359 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 360 dev->ifindex, dev->name, 361 ha->refcount, ha->global_use, 362 (int)dev->addr_len, ha->addr); 363 } 364 netif_addr_unlock_bh(dev); 365 return 0; 366 } 367 368 static const struct seq_operations dev_mc_seq_ops = { 369 .start = dev_seq_start, 370 .next = dev_seq_next, 371 .stop = dev_seq_stop, 372 .show = dev_mc_seq_show, 373 }; 374 375 static int __net_init dev_mc_net_init(struct net *net) 376 { 377 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 378 sizeof(struct seq_net_private))) 379 return -ENOMEM; 380 return 0; 381 } 382 383 static void __net_exit dev_mc_net_exit(struct net *net) 384 { 385 remove_proc_entry("dev_mcast", net->proc_net); 386 } 387 388 static struct pernet_operations __net_initdata dev_mc_net_ops = { 389 .init = dev_mc_net_init, 390 .exit = dev_mc_net_exit, 391 }; 392 393 int __init dev_proc_init(void) 394 { 395 int ret = register_pernet_subsys(&dev_proc_ops); 396 if (!ret) 397 return register_pernet_subsys(&dev_mc_net_ops); 398 return ret; 399 } 400