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 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1) 8 9 #define get_bucket(x) ((x) >> BUCKET_SPACE) 10 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1)) 11 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) 12 13 extern struct list_head ptype_all __read_mostly; 14 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; 15 16 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos) 17 { 18 struct net *net = seq_file_net(seq); 19 struct net_device *dev; 20 struct hlist_head *h; 21 unsigned int count = 0, offset = get_offset(*pos); 22 23 h = &net->dev_name_head[get_bucket(*pos)]; 24 hlist_for_each_entry_rcu(dev, h, name_hlist) { 25 if (++count == offset) 26 return dev; 27 } 28 29 return NULL; 30 } 31 32 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos) 33 { 34 struct net_device *dev; 35 unsigned int bucket; 36 37 do { 38 dev = dev_from_same_bucket(seq, pos); 39 if (dev) 40 return dev; 41 42 bucket = get_bucket(*pos) + 1; 43 *pos = set_bucket_offset(bucket, 1); 44 } while (bucket < NETDEV_HASHENTRIES); 45 46 return NULL; 47 } 48 49 /* 50 * This is invoked by the /proc filesystem handler to display a device 51 * in detail. 52 */ 53 static void *dev_seq_start(struct seq_file *seq, loff_t *pos) 54 __acquires(RCU) 55 { 56 rcu_read_lock(); 57 if (!*pos) 58 return SEQ_START_TOKEN; 59 60 if (get_bucket(*pos) >= NETDEV_HASHENTRIES) 61 return NULL; 62 63 return dev_from_bucket(seq, pos); 64 } 65 66 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) 67 { 68 ++*pos; 69 return dev_from_bucket(seq, pos); 70 } 71 72 static void dev_seq_stop(struct seq_file *seq, void *v) 73 __releases(RCU) 74 { 75 rcu_read_unlock(); 76 } 77 78 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) 79 { 80 struct rtnl_link_stats64 temp; 81 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 82 83 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " 84 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n", 85 dev->name, stats->rx_bytes, stats->rx_packets, 86 stats->rx_errors, 87 stats->rx_dropped + stats->rx_missed_errors, 88 stats->rx_fifo_errors, 89 stats->rx_length_errors + stats->rx_over_errors + 90 stats->rx_crc_errors + stats->rx_frame_errors, 91 stats->rx_compressed, stats->multicast, 92 stats->tx_bytes, stats->tx_packets, 93 stats->tx_errors, stats->tx_dropped, 94 stats->tx_fifo_errors, stats->collisions, 95 stats->tx_carrier_errors + 96 stats->tx_aborted_errors + 97 stats->tx_window_errors + 98 stats->tx_heartbeat_errors, 99 stats->tx_compressed); 100 } 101 102 /* 103 * Called from the PROCfs module. This now uses the new arbitrary sized 104 * /proc/net interface to create /proc/net/dev 105 */ 106 static int dev_seq_show(struct seq_file *seq, void *v) 107 { 108 if (v == SEQ_START_TOKEN) 109 seq_puts(seq, "Inter-| Receive " 110 " | Transmit\n" 111 " face |bytes packets errs drop fifo frame " 112 "compressed multicast|bytes packets errs " 113 "drop fifo colls carrier compressed\n"); 114 else 115 dev_seq_printf_stats(seq, v); 116 return 0; 117 } 118 119 static struct softnet_data *softnet_get_online(loff_t *pos) 120 { 121 struct softnet_data *sd = NULL; 122 123 while (*pos < nr_cpu_ids) 124 if (cpu_online(*pos)) { 125 sd = &per_cpu(softnet_data, *pos); 126 break; 127 } else 128 ++*pos; 129 return sd; 130 } 131 132 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 133 { 134 return softnet_get_online(pos); 135 } 136 137 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 138 { 139 ++*pos; 140 return softnet_get_online(pos); 141 } 142 143 static void softnet_seq_stop(struct seq_file *seq, void *v) 144 { 145 } 146 147 static int softnet_seq_show(struct seq_file *seq, void *v) 148 { 149 struct softnet_data *sd = v; 150 unsigned int flow_limit_count = 0; 151 152 #ifdef CONFIG_NET_FLOW_LIMIT 153 struct sd_flow_limit *fl; 154 155 rcu_read_lock(); 156 fl = rcu_dereference(sd->flow_limit); 157 if (fl) 158 flow_limit_count = fl->count; 159 rcu_read_unlock(); 160 #endif 161 162 seq_printf(seq, 163 "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", 164 sd->processed, sd->dropped, sd->time_squeeze, 0, 165 0, 0, 0, 0, /* was fastroute */ 166 0, /* was cpu_collision */ 167 sd->received_rps, flow_limit_count); 168 return 0; 169 } 170 171 static const struct seq_operations dev_seq_ops = { 172 .start = dev_seq_start, 173 .next = dev_seq_next, 174 .stop = dev_seq_stop, 175 .show = dev_seq_show, 176 }; 177 178 static int dev_seq_open(struct inode *inode, struct file *file) 179 { 180 return seq_open_net(inode, file, &dev_seq_ops, 181 sizeof(struct seq_net_private)); 182 } 183 184 static const struct file_operations dev_seq_fops = { 185 .owner = THIS_MODULE, 186 .open = dev_seq_open, 187 .read = seq_read, 188 .llseek = seq_lseek, 189 .release = seq_release_net, 190 }; 191 192 static const struct seq_operations softnet_seq_ops = { 193 .start = softnet_seq_start, 194 .next = softnet_seq_next, 195 .stop = softnet_seq_stop, 196 .show = softnet_seq_show, 197 }; 198 199 static int softnet_seq_open(struct inode *inode, struct file *file) 200 { 201 return seq_open(file, &softnet_seq_ops); 202 } 203 204 static const struct file_operations softnet_seq_fops = { 205 .owner = THIS_MODULE, 206 .open = softnet_seq_open, 207 .read = seq_read, 208 .llseek = seq_lseek, 209 .release = seq_release, 210 }; 211 212 static void *ptype_get_idx(loff_t pos) 213 { 214 struct packet_type *pt = NULL; 215 loff_t i = 0; 216 int t; 217 218 list_for_each_entry_rcu(pt, &ptype_all, list) { 219 if (i == pos) 220 return pt; 221 ++i; 222 } 223 224 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 225 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 226 if (i == pos) 227 return pt; 228 ++i; 229 } 230 } 231 return NULL; 232 } 233 234 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 235 __acquires(RCU) 236 { 237 rcu_read_lock(); 238 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; 239 } 240 241 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 242 { 243 struct packet_type *pt; 244 struct list_head *nxt; 245 int hash; 246 247 ++*pos; 248 if (v == SEQ_START_TOKEN) 249 return ptype_get_idx(0); 250 251 pt = v; 252 nxt = pt->list.next; 253 if (pt->type == htons(ETH_P_ALL)) { 254 if (nxt != &ptype_all) 255 goto found; 256 hash = 0; 257 nxt = ptype_base[0].next; 258 } else 259 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 260 261 while (nxt == &ptype_base[hash]) { 262 if (++hash >= PTYPE_HASH_SIZE) 263 return NULL; 264 nxt = ptype_base[hash].next; 265 } 266 found: 267 return list_entry(nxt, struct packet_type, list); 268 } 269 270 static void ptype_seq_stop(struct seq_file *seq, void *v) 271 __releases(RCU) 272 { 273 rcu_read_unlock(); 274 } 275 276 static int ptype_seq_show(struct seq_file *seq, void *v) 277 { 278 struct packet_type *pt = v; 279 280 if (v == SEQ_START_TOKEN) 281 seq_puts(seq, "Type Device Function\n"); 282 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { 283 if (pt->type == htons(ETH_P_ALL)) 284 seq_puts(seq, "ALL "); 285 else 286 seq_printf(seq, "%04x", ntohs(pt->type)); 287 288 seq_printf(seq, " %-8s %pf\n", 289 pt->dev ? pt->dev->name : "", pt->func); 290 } 291 292 return 0; 293 } 294 295 static const struct seq_operations ptype_seq_ops = { 296 .start = ptype_seq_start, 297 .next = ptype_seq_next, 298 .stop = ptype_seq_stop, 299 .show = ptype_seq_show, 300 }; 301 302 static int ptype_seq_open(struct inode *inode, struct file *file) 303 { 304 return seq_open_net(inode, file, &ptype_seq_ops, 305 sizeof(struct seq_net_private)); 306 } 307 308 static const struct file_operations ptype_seq_fops = { 309 .owner = THIS_MODULE, 310 .open = ptype_seq_open, 311 .read = seq_read, 312 .llseek = seq_lseek, 313 .release = seq_release_net, 314 }; 315 316 317 static int __net_init dev_proc_net_init(struct net *net) 318 { 319 int rc = -ENOMEM; 320 321 if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops)) 322 goto out; 323 if (!proc_create("softnet_stat", S_IRUGO, net->proc_net, 324 &softnet_seq_fops)) 325 goto out_dev; 326 if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops)) 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 dev_mc_seq_open(struct inode *inode, struct file *file) 384 { 385 return seq_open_net(inode, file, &dev_mc_seq_ops, 386 sizeof(struct seq_net_private)); 387 } 388 389 static const struct file_operations dev_mc_seq_fops = { 390 .owner = THIS_MODULE, 391 .open = dev_mc_seq_open, 392 .read = seq_read, 393 .llseek = seq_lseek, 394 .release = seq_release_net, 395 }; 396 397 static int __net_init dev_mc_net_init(struct net *net) 398 { 399 if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops)) 400 return -ENOMEM; 401 return 0; 402 } 403 404 static void __net_exit dev_mc_net_exit(struct net *net) 405 { 406 remove_proc_entry("dev_mcast", net->proc_net); 407 } 408 409 static struct pernet_operations __net_initdata dev_mc_net_ops = { 410 .init = dev_mc_net_init, 411 .exit = dev_mc_net_exit, 412 }; 413 414 int __init dev_proc_init(void) 415 { 416 int ret = register_pernet_subsys(&dev_proc_ops); 417 if (!ret) 418 return register_pernet_subsys(&dev_mc_net_ops); 419 return ret; 420 } 421