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_input_pkt_queue_len(struct softnet_data *sd) 119 { 120 return skb_queue_len_lockless(&sd->input_pkt_queue); 121 } 122 123 static u32 softnet_process_queue_len(struct softnet_data *sd) 124 { 125 return skb_queue_len_lockless(&sd->process_queue); 126 } 127 128 static struct softnet_data *softnet_get_online(loff_t *pos) 129 { 130 struct softnet_data *sd = NULL; 131 132 while (*pos < nr_cpu_ids) 133 if (cpu_online(*pos)) { 134 sd = &per_cpu(softnet_data, *pos); 135 break; 136 } else 137 ++*pos; 138 return sd; 139 } 140 141 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 142 { 143 return softnet_get_online(pos); 144 } 145 146 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 147 { 148 ++*pos; 149 return softnet_get_online(pos); 150 } 151 152 static void softnet_seq_stop(struct seq_file *seq, void *v) 153 { 154 } 155 156 static int softnet_seq_show(struct seq_file *seq, void *v) 157 { 158 struct softnet_data *sd = v; 159 u32 input_qlen = softnet_input_pkt_queue_len(sd); 160 u32 process_qlen = softnet_process_queue_len(sd); 161 unsigned int flow_limit_count = 0; 162 163 #ifdef CONFIG_NET_FLOW_LIMIT 164 struct sd_flow_limit *fl; 165 166 rcu_read_lock(); 167 fl = rcu_dereference(sd->flow_limit); 168 if (fl) 169 flow_limit_count = fl->count; 170 rcu_read_unlock(); 171 #endif 172 173 /* the index is the CPU id owing this sd. Since offline CPUs are not 174 * displayed, it would be othrwise not trivial for the user-space 175 * mapping the data a specific CPU 176 */ 177 seq_printf(seq, 178 "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x " 179 "%08x %08x\n", 180 sd->processed, sd->dropped, sd->time_squeeze, 0, 181 0, 0, 0, 0, /* was fastroute */ 182 0, /* was cpu_collision */ 183 sd->received_rps, flow_limit_count, 184 input_qlen + process_qlen, (int)seq->index, 185 input_qlen, process_qlen); 186 return 0; 187 } 188 189 static const struct seq_operations dev_seq_ops = { 190 .start = dev_seq_start, 191 .next = dev_seq_next, 192 .stop = dev_seq_stop, 193 .show = dev_seq_show, 194 }; 195 196 static const struct seq_operations softnet_seq_ops = { 197 .start = softnet_seq_start, 198 .next = softnet_seq_next, 199 .stop = softnet_seq_stop, 200 .show = softnet_seq_show, 201 }; 202 203 static void *ptype_get_idx(struct seq_file *seq, loff_t pos) 204 { 205 struct list_head *ptype_list = NULL; 206 struct packet_type *pt = NULL; 207 struct net_device *dev; 208 loff_t i = 0; 209 int t; 210 211 for_each_netdev_rcu(seq_file_net(seq), dev) { 212 ptype_list = &dev->ptype_all; 213 list_for_each_entry_rcu(pt, ptype_list, list) { 214 if (i == pos) 215 return pt; 216 ++i; 217 } 218 } 219 220 list_for_each_entry_rcu(pt, &ptype_all, list) { 221 if (i == pos) 222 return pt; 223 ++i; 224 } 225 226 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 227 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 228 if (i == pos) 229 return pt; 230 ++i; 231 } 232 } 233 return NULL; 234 } 235 236 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 237 __acquires(RCU) 238 { 239 rcu_read_lock(); 240 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 241 } 242 243 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 244 { 245 struct net_device *dev; 246 struct packet_type *pt; 247 struct list_head *nxt; 248 int hash; 249 250 ++*pos; 251 if (v == SEQ_START_TOKEN) 252 return ptype_get_idx(seq, 0); 253 254 pt = v; 255 nxt = pt->list.next; 256 if (pt->dev) { 257 if (nxt != &pt->dev->ptype_all) 258 goto found; 259 260 dev = pt->dev; 261 for_each_netdev_continue_rcu(seq_file_net(seq), dev) { 262 if (!list_empty(&dev->ptype_all)) { 263 nxt = dev->ptype_all.next; 264 goto found; 265 } 266 } 267 268 nxt = ptype_all.next; 269 goto ptype_all; 270 } 271 272 if (pt->type == htons(ETH_P_ALL)) { 273 ptype_all: 274 if (nxt != &ptype_all) 275 goto found; 276 hash = 0; 277 nxt = ptype_base[0].next; 278 } else 279 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 280 281 while (nxt == &ptype_base[hash]) { 282 if (++hash >= PTYPE_HASH_SIZE) 283 return NULL; 284 nxt = ptype_base[hash].next; 285 } 286 found: 287 return list_entry(nxt, struct packet_type, list); 288 } 289 290 static void ptype_seq_stop(struct seq_file *seq, void *v) 291 __releases(RCU) 292 { 293 rcu_read_unlock(); 294 } 295 296 static int ptype_seq_show(struct seq_file *seq, void *v) 297 { 298 struct packet_type *pt = v; 299 300 if (v == SEQ_START_TOKEN) 301 seq_puts(seq, "Type Device Function\n"); 302 else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) && 303 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) { 304 if (pt->type == htons(ETH_P_ALL)) 305 seq_puts(seq, "ALL "); 306 else 307 seq_printf(seq, "%04x", ntohs(pt->type)); 308 309 seq_printf(seq, " %-8s %ps\n", 310 pt->dev ? pt->dev->name : "", pt->func); 311 } 312 313 return 0; 314 } 315 316 static const struct seq_operations ptype_seq_ops = { 317 .start = ptype_seq_start, 318 .next = ptype_seq_next, 319 .stop = ptype_seq_stop, 320 .show = ptype_seq_show, 321 }; 322 323 static int __net_init dev_proc_net_init(struct net *net) 324 { 325 int rc = -ENOMEM; 326 327 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 328 sizeof(struct seq_net_private))) 329 goto out; 330 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 331 &softnet_seq_ops)) 332 goto out_dev; 333 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 334 sizeof(struct seq_net_private))) 335 goto out_softnet; 336 337 if (wext_proc_init(net)) 338 goto out_ptype; 339 rc = 0; 340 out: 341 return rc; 342 out_ptype: 343 remove_proc_entry("ptype", net->proc_net); 344 out_softnet: 345 remove_proc_entry("softnet_stat", net->proc_net); 346 out_dev: 347 remove_proc_entry("dev", net->proc_net); 348 goto out; 349 } 350 351 static void __net_exit dev_proc_net_exit(struct net *net) 352 { 353 wext_proc_exit(net); 354 355 remove_proc_entry("ptype", net->proc_net); 356 remove_proc_entry("softnet_stat", net->proc_net); 357 remove_proc_entry("dev", net->proc_net); 358 } 359 360 static struct pernet_operations __net_initdata dev_proc_ops = { 361 .init = dev_proc_net_init, 362 .exit = dev_proc_net_exit, 363 }; 364 365 static int dev_mc_seq_show(struct seq_file *seq, void *v) 366 { 367 struct netdev_hw_addr *ha; 368 struct net_device *dev = v; 369 370 if (v == SEQ_START_TOKEN) 371 return 0; 372 373 netif_addr_lock_bh(dev); 374 netdev_for_each_mc_addr(ha, dev) { 375 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 376 dev->ifindex, dev->name, 377 ha->refcount, ha->global_use, 378 (int)dev->addr_len, ha->addr); 379 } 380 netif_addr_unlock_bh(dev); 381 return 0; 382 } 383 384 static const struct seq_operations dev_mc_seq_ops = { 385 .start = dev_seq_start, 386 .next = dev_seq_next, 387 .stop = dev_seq_stop, 388 .show = dev_mc_seq_show, 389 }; 390 391 static int __net_init dev_mc_net_init(struct net *net) 392 { 393 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 394 sizeof(struct seq_net_private))) 395 return -ENOMEM; 396 return 0; 397 } 398 399 static void __net_exit dev_mc_net_exit(struct net *net) 400 { 401 remove_proc_entry("dev_mcast", net->proc_net); 402 } 403 404 static struct pernet_operations __net_initdata dev_mc_net_ops = { 405 .init = dev_mc_net_init, 406 .exit = dev_mc_net_exit, 407 }; 408 409 int __init dev_proc_init(void) 410 { 411 int ret = register_pernet_subsys(&dev_proc_ops); 412 if (!ret) 413 return register_pernet_subsys(&dev_mc_net_ops); 414 return ret; 415 } 416