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), atomic_read(&sd->dropped), 149 READ_ONCE(sd->time_squeeze), 0, 150 0, 0, 0, 0, /* was fastroute */ 151 0, /* was cpu_collision */ 152 READ_ONCE(sd->received_rps), flow_limit_count, 153 input_qlen + process_qlen, (int)seq->index, 154 input_qlen, process_qlen); 155 return 0; 156 } 157 158 static const struct seq_operations dev_seq_ops = { 159 .start = dev_seq_start, 160 .next = dev_seq_next, 161 .stop = dev_seq_stop, 162 .show = dev_seq_show, 163 }; 164 165 static const struct seq_operations softnet_seq_ops = { 166 .start = softnet_seq_start, 167 .next = softnet_seq_next, 168 .stop = softnet_seq_stop, 169 .show = softnet_seq_show, 170 }; 171 172 static void *ptype_get_idx(struct seq_file *seq, loff_t pos) 173 { 174 struct list_head *ptype_list = NULL; 175 struct packet_type *pt = NULL; 176 struct net_device *dev; 177 loff_t i = 0; 178 int t; 179 180 for_each_netdev_rcu(seq_file_net(seq), dev) { 181 ptype_list = &dev->ptype_all; 182 list_for_each_entry_rcu(pt, ptype_list, list) { 183 if (i == pos) 184 return pt; 185 ++i; 186 } 187 } 188 189 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) { 190 if (i == pos) 191 return pt; 192 ++i; 193 } 194 195 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) { 196 if (i == pos) 197 return pt; 198 ++i; 199 } 200 201 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 202 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 203 if (i == pos) 204 return pt; 205 ++i; 206 } 207 } 208 return NULL; 209 } 210 211 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 212 __acquires(RCU) 213 { 214 rcu_read_lock(); 215 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 216 } 217 218 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 219 { 220 struct net *net = seq_file_net(seq); 221 struct net_device *dev; 222 struct packet_type *pt; 223 struct list_head *nxt; 224 int hash; 225 226 ++*pos; 227 if (v == SEQ_START_TOKEN) 228 return ptype_get_idx(seq, 0); 229 230 pt = v; 231 nxt = pt->list.next; 232 if (pt->dev) { 233 if (nxt != &pt->dev->ptype_all) 234 goto found; 235 236 dev = pt->dev; 237 for_each_netdev_continue_rcu(seq_file_net(seq), dev) { 238 if (!list_empty(&dev->ptype_all)) { 239 nxt = dev->ptype_all.next; 240 goto found; 241 } 242 } 243 nxt = net->ptype_all.next; 244 goto net_ptype_all; 245 } 246 247 if (pt->af_packet_net) { 248 net_ptype_all: 249 if (nxt != &net->ptype_all && nxt != &net->ptype_specific) 250 goto found; 251 252 if (nxt == &net->ptype_all) { 253 /* continue with ->ptype_specific if it's not empty */ 254 nxt = net->ptype_specific.next; 255 if (nxt != &net->ptype_specific) 256 goto found; 257 } 258 259 hash = 0; 260 nxt = ptype_base[0].next; 261 } else 262 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 263 264 while (nxt == &ptype_base[hash]) { 265 if (++hash >= PTYPE_HASH_SIZE) 266 return NULL; 267 nxt = ptype_base[hash].next; 268 } 269 found: 270 return list_entry(nxt, struct packet_type, list); 271 } 272 273 static void ptype_seq_stop(struct seq_file *seq, void *v) 274 __releases(RCU) 275 { 276 rcu_read_unlock(); 277 } 278 279 static int ptype_seq_show(struct seq_file *seq, void *v) 280 { 281 struct packet_type *pt = v; 282 283 if (v == SEQ_START_TOKEN) 284 seq_puts(seq, "Type Device Function\n"); 285 else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) && 286 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) { 287 if (pt->type == htons(ETH_P_ALL)) 288 seq_puts(seq, "ALL "); 289 else 290 seq_printf(seq, "%04x", ntohs(pt->type)); 291 292 seq_printf(seq, " %-8s %ps\n", 293 pt->dev ? pt->dev->name : "", pt->func); 294 } 295 296 return 0; 297 } 298 299 static const struct seq_operations ptype_seq_ops = { 300 .start = ptype_seq_start, 301 .next = ptype_seq_next, 302 .stop = ptype_seq_stop, 303 .show = ptype_seq_show, 304 }; 305 306 static int __net_init dev_proc_net_init(struct net *net) 307 { 308 int rc = -ENOMEM; 309 310 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 311 sizeof(struct seq_net_private))) 312 goto out; 313 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 314 &softnet_seq_ops)) 315 goto out_dev; 316 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 317 sizeof(struct seq_net_private))) 318 goto out_softnet; 319 320 if (wext_proc_init(net)) 321 goto out_ptype; 322 rc = 0; 323 out: 324 return rc; 325 out_ptype: 326 remove_proc_entry("ptype", net->proc_net); 327 out_softnet: 328 remove_proc_entry("softnet_stat", net->proc_net); 329 out_dev: 330 remove_proc_entry("dev", net->proc_net); 331 goto out; 332 } 333 334 static void __net_exit dev_proc_net_exit(struct net *net) 335 { 336 wext_proc_exit(net); 337 338 remove_proc_entry("ptype", net->proc_net); 339 remove_proc_entry("softnet_stat", net->proc_net); 340 remove_proc_entry("dev", net->proc_net); 341 } 342 343 static struct pernet_operations __net_initdata dev_proc_ops = { 344 .init = dev_proc_net_init, 345 .exit = dev_proc_net_exit, 346 }; 347 348 static int dev_mc_seq_show(struct seq_file *seq, void *v) 349 { 350 struct netdev_hw_addr *ha; 351 struct net_device *dev = v; 352 353 if (v == SEQ_START_TOKEN) 354 return 0; 355 356 netif_addr_lock_bh(dev); 357 netdev_for_each_mc_addr(ha, dev) { 358 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 359 dev->ifindex, dev->name, 360 ha->refcount, ha->global_use, 361 (int)dev->addr_len, ha->addr); 362 } 363 netif_addr_unlock_bh(dev); 364 return 0; 365 } 366 367 static const struct seq_operations dev_mc_seq_ops = { 368 .start = dev_seq_start, 369 .next = dev_seq_next, 370 .stop = dev_seq_stop, 371 .show = dev_mc_seq_show, 372 }; 373 374 static int __net_init dev_mc_net_init(struct net *net) 375 { 376 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 377 sizeof(struct seq_net_private))) 378 return -ENOMEM; 379 return 0; 380 } 381 382 static void __net_exit dev_mc_net_exit(struct net *net) 383 { 384 remove_proc_entry("dev_mcast", net->proc_net); 385 } 386 387 static struct pernet_operations __net_initdata dev_mc_net_ops = { 388 .init = dev_mc_net_init, 389 .exit = dev_mc_net_exit, 390 }; 391 392 int __init dev_proc_init(void) 393 { 394 int ret = register_pernet_subsys(&dev_proc_ops); 395 if (!ret) 396 return register_pernet_subsys(&dev_mc_net_ops); 397 return ret; 398 } 399