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 7 #include "dev.h" 8 9 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1) 10 11 #define get_bucket(x) ((x) >> BUCKET_SPACE) 12 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1)) 13 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) 14 15 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos) 16 { 17 struct net *net = seq_file_net(seq); 18 struct net_device *dev; 19 struct hlist_head *h; 20 unsigned int count = 0, offset = get_offset(*pos); 21 22 h = &net->dev_index_head[get_bucket(*pos)]; 23 hlist_for_each_entry_rcu(dev, h, index_hlist) { 24 if (++count == offset) 25 return dev; 26 } 27 28 return NULL; 29 } 30 31 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos) 32 { 33 struct net_device *dev; 34 unsigned int bucket; 35 36 do { 37 dev = dev_from_same_bucket(seq, pos); 38 if (dev) 39 return dev; 40 41 bucket = get_bucket(*pos) + 1; 42 *pos = set_bucket_offset(bucket, 1); 43 } while (bucket < NETDEV_HASHENTRIES); 44 45 return NULL; 46 } 47 48 /* 49 * This is invoked by the /proc filesystem handler to display a device 50 * in detail. 51 */ 52 static void *dev_seq_start(struct seq_file *seq, loff_t *pos) 53 __acquires(RCU) 54 { 55 rcu_read_lock(); 56 if (!*pos) 57 return SEQ_START_TOKEN; 58 59 if (get_bucket(*pos) >= NETDEV_HASHENTRIES) 60 return NULL; 61 62 return dev_from_bucket(seq, pos); 63 } 64 65 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) 66 { 67 ++*pos; 68 return dev_from_bucket(seq, pos); 69 } 70 71 static void dev_seq_stop(struct seq_file *seq, void *v) 72 __releases(RCU) 73 { 74 rcu_read_unlock(); 75 } 76 77 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) 78 { 79 struct rtnl_link_stats64 temp; 80 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 81 82 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " 83 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n", 84 dev->name, stats->rx_bytes, stats->rx_packets, 85 stats->rx_errors, 86 stats->rx_dropped + stats->rx_missed_errors, 87 stats->rx_fifo_errors, 88 stats->rx_length_errors + stats->rx_over_errors + 89 stats->rx_crc_errors + stats->rx_frame_errors, 90 stats->rx_compressed, stats->multicast, 91 stats->tx_bytes, stats->tx_packets, 92 stats->tx_errors, stats->tx_dropped, 93 stats->tx_fifo_errors, stats->collisions, 94 stats->tx_carrier_errors + 95 stats->tx_aborted_errors + 96 stats->tx_window_errors + 97 stats->tx_heartbeat_errors, 98 stats->tx_compressed); 99 } 100 101 /* 102 * Called from the PROCfs module. This now uses the new arbitrary sized 103 * /proc/net interface to create /proc/net/dev 104 */ 105 static int dev_seq_show(struct seq_file *seq, void *v) 106 { 107 if (v == SEQ_START_TOKEN) 108 seq_puts(seq, "Inter-| Receive " 109 " | Transmit\n" 110 " face |bytes packets errs drop fifo frame " 111 "compressed multicast|bytes packets errs " 112 "drop fifo colls carrier compressed\n"); 113 else 114 dev_seq_printf_stats(seq, v); 115 return 0; 116 } 117 118 static u32 softnet_backlog_len(struct softnet_data *sd) 119 { 120 return skb_queue_len_lockless(&sd->input_pkt_queue) + 121 skb_queue_len_lockless(&sd->process_queue); 122 } 123 124 static struct softnet_data *softnet_get_online(loff_t *pos) 125 { 126 struct softnet_data *sd = NULL; 127 128 while (*pos < nr_cpu_ids) 129 if (cpu_online(*pos)) { 130 sd = &per_cpu(softnet_data, *pos); 131 break; 132 } else 133 ++*pos; 134 return sd; 135 } 136 137 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 138 { 139 return softnet_get_online(pos); 140 } 141 142 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 143 { 144 ++*pos; 145 return softnet_get_online(pos); 146 } 147 148 static void softnet_seq_stop(struct seq_file *seq, void *v) 149 { 150 } 151 152 static int softnet_seq_show(struct seq_file *seq, void *v) 153 { 154 struct softnet_data *sd = v; 155 unsigned int flow_limit_count = 0; 156 157 #ifdef CONFIG_NET_FLOW_LIMIT 158 struct sd_flow_limit *fl; 159 160 rcu_read_lock(); 161 fl = rcu_dereference(sd->flow_limit); 162 if (fl) 163 flow_limit_count = fl->count; 164 rcu_read_unlock(); 165 #endif 166 167 /* the index is the CPU id owing this sd. Since offline CPUs are not 168 * displayed, it would be othrwise not trivial for the user-space 169 * mapping the data a specific CPU 170 */ 171 seq_printf(seq, 172 "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", 173 sd->processed, sd->dropped, sd->time_squeeze, 0, 174 0, 0, 0, 0, /* was fastroute */ 175 0, /* was cpu_collision */ 176 sd->received_rps, flow_limit_count, 177 softnet_backlog_len(sd), (int)seq->index); 178 return 0; 179 } 180 181 static const struct seq_operations dev_seq_ops = { 182 .start = dev_seq_start, 183 .next = dev_seq_next, 184 .stop = dev_seq_stop, 185 .show = dev_seq_show, 186 }; 187 188 static const struct seq_operations softnet_seq_ops = { 189 .start = softnet_seq_start, 190 .next = softnet_seq_next, 191 .stop = softnet_seq_stop, 192 .show = softnet_seq_show, 193 }; 194 195 static void *ptype_get_idx(struct seq_file *seq, loff_t pos) 196 { 197 struct list_head *ptype_list = NULL; 198 struct packet_type *pt = NULL; 199 struct net_device *dev; 200 loff_t i = 0; 201 int t; 202 203 for_each_netdev_rcu(seq_file_net(seq), dev) { 204 ptype_list = &dev->ptype_all; 205 list_for_each_entry_rcu(pt, ptype_list, list) { 206 if (i == pos) 207 return pt; 208 ++i; 209 } 210 } 211 212 list_for_each_entry_rcu(pt, &ptype_all, list) { 213 if (i == pos) 214 return pt; 215 ++i; 216 } 217 218 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 219 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 220 if (i == pos) 221 return pt; 222 ++i; 223 } 224 } 225 return NULL; 226 } 227 228 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 229 __acquires(RCU) 230 { 231 rcu_read_lock(); 232 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 233 } 234 235 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 236 { 237 struct net_device *dev; 238 struct packet_type *pt; 239 struct list_head *nxt; 240 int hash; 241 242 ++*pos; 243 if (v == SEQ_START_TOKEN) 244 return ptype_get_idx(seq, 0); 245 246 pt = v; 247 nxt = pt->list.next; 248 if (pt->dev) { 249 if (nxt != &pt->dev->ptype_all) 250 goto found; 251 252 dev = pt->dev; 253 for_each_netdev_continue_rcu(seq_file_net(seq), dev) { 254 if (!list_empty(&dev->ptype_all)) { 255 nxt = dev->ptype_all.next; 256 goto found; 257 } 258 } 259 260 nxt = ptype_all.next; 261 goto ptype_all; 262 } 263 264 if (pt->type == htons(ETH_P_ALL)) { 265 ptype_all: 266 if (nxt != &ptype_all) 267 goto found; 268 hash = 0; 269 nxt = ptype_base[0].next; 270 } else 271 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 272 273 while (nxt == &ptype_base[hash]) { 274 if (++hash >= PTYPE_HASH_SIZE) 275 return NULL; 276 nxt = ptype_base[hash].next; 277 } 278 found: 279 return list_entry(nxt, struct packet_type, list); 280 } 281 282 static void ptype_seq_stop(struct seq_file *seq, void *v) 283 __releases(RCU) 284 { 285 rcu_read_unlock(); 286 } 287 288 static int ptype_seq_show(struct seq_file *seq, void *v) 289 { 290 struct packet_type *pt = v; 291 292 if (v == SEQ_START_TOKEN) 293 seq_puts(seq, "Type Device Function\n"); 294 else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) && 295 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) { 296 if (pt->type == htons(ETH_P_ALL)) 297 seq_puts(seq, "ALL "); 298 else 299 seq_printf(seq, "%04x", ntohs(pt->type)); 300 301 seq_printf(seq, " %-8s %ps\n", 302 pt->dev ? pt->dev->name : "", pt->func); 303 } 304 305 return 0; 306 } 307 308 static const struct seq_operations ptype_seq_ops = { 309 .start = ptype_seq_start, 310 .next = ptype_seq_next, 311 .stop = ptype_seq_stop, 312 .show = ptype_seq_show, 313 }; 314 315 static int __net_init dev_proc_net_init(struct net *net) 316 { 317 int rc = -ENOMEM; 318 319 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 320 sizeof(struct seq_net_private))) 321 goto out; 322 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 323 &softnet_seq_ops)) 324 goto out_dev; 325 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 326 sizeof(struct seq_net_private))) 327 goto out_softnet; 328 329 if (wext_proc_init(net)) 330 goto out_ptype; 331 rc = 0; 332 out: 333 return rc; 334 out_ptype: 335 remove_proc_entry("ptype", net->proc_net); 336 out_softnet: 337 remove_proc_entry("softnet_stat", net->proc_net); 338 out_dev: 339 remove_proc_entry("dev", net->proc_net); 340 goto out; 341 } 342 343 static void __net_exit dev_proc_net_exit(struct net *net) 344 { 345 wext_proc_exit(net); 346 347 remove_proc_entry("ptype", net->proc_net); 348 remove_proc_entry("softnet_stat", net->proc_net); 349 remove_proc_entry("dev", net->proc_net); 350 } 351 352 static struct pernet_operations __net_initdata dev_proc_ops = { 353 .init = dev_proc_net_init, 354 .exit = dev_proc_net_exit, 355 }; 356 357 static int dev_mc_seq_show(struct seq_file *seq, void *v) 358 { 359 struct netdev_hw_addr *ha; 360 struct net_device *dev = v; 361 362 if (v == SEQ_START_TOKEN) 363 return 0; 364 365 netif_addr_lock_bh(dev); 366 netdev_for_each_mc_addr(ha, dev) { 367 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 368 dev->ifindex, dev->name, 369 ha->refcount, ha->global_use, 370 (int)dev->addr_len, ha->addr); 371 } 372 netif_addr_unlock_bh(dev); 373 return 0; 374 } 375 376 static const struct seq_operations dev_mc_seq_ops = { 377 .start = dev_seq_start, 378 .next = dev_seq_next, 379 .stop = dev_seq_stop, 380 .show = dev_mc_seq_show, 381 }; 382 383 static int __net_init dev_mc_net_init(struct net *net) 384 { 385 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 386 sizeof(struct seq_net_private))) 387 return -ENOMEM; 388 return 0; 389 } 390 391 static void __net_exit dev_mc_net_exit(struct net *net) 392 { 393 remove_proc_entry("dev_mcast", net->proc_net); 394 } 395 396 static struct pernet_operations __net_initdata dev_mc_net_ops = { 397 .init = dev_mc_net_init, 398 .exit = dev_mc_net_exit, 399 }; 400 401 int __init dev_proc_init(void) 402 { 403 int ret = register_pernet_subsys(&dev_proc_ops); 404 if (!ret) 405 return register_pernet_subsys(&dev_mc_net_ops); 406 return ret; 407 } 408