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_index_head[get_bucket(*pos)]; 24 hlist_for_each_entry_rcu(dev, h, index_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 u32 softnet_backlog_len(struct softnet_data *sd) 120 { 121 return skb_queue_len_lockless(&sd->input_pkt_queue) + 122 skb_queue_len_lockless(&sd->process_queue); 123 } 124 125 static struct softnet_data *softnet_get_online(loff_t *pos) 126 { 127 struct softnet_data *sd = NULL; 128 129 while (*pos < nr_cpu_ids) 130 if (cpu_online(*pos)) { 131 sd = &per_cpu(softnet_data, *pos); 132 break; 133 } else 134 ++*pos; 135 return sd; 136 } 137 138 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 139 { 140 return softnet_get_online(pos); 141 } 142 143 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 144 { 145 ++*pos; 146 return softnet_get_online(pos); 147 } 148 149 static void softnet_seq_stop(struct seq_file *seq, void *v) 150 { 151 } 152 153 static int softnet_seq_show(struct seq_file *seq, void *v) 154 { 155 struct softnet_data *sd = v; 156 unsigned int flow_limit_count = 0; 157 158 #ifdef CONFIG_NET_FLOW_LIMIT 159 struct sd_flow_limit *fl; 160 161 rcu_read_lock(); 162 fl = rcu_dereference(sd->flow_limit); 163 if (fl) 164 flow_limit_count = fl->count; 165 rcu_read_unlock(); 166 #endif 167 168 /* the index is the CPU id owing this sd. Since offline CPUs are not 169 * displayed, it would be othrwise not trivial for the user-space 170 * mapping the data a specific CPU 171 */ 172 seq_printf(seq, 173 "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", 174 sd->processed, sd->dropped, sd->time_squeeze, 0, 175 0, 0, 0, 0, /* was fastroute */ 176 0, /* was cpu_collision */ 177 sd->received_rps, flow_limit_count, 178 softnet_backlog_len(sd), (int)seq->index); 179 return 0; 180 } 181 182 static const struct seq_operations dev_seq_ops = { 183 .start = dev_seq_start, 184 .next = dev_seq_next, 185 .stop = dev_seq_stop, 186 .show = dev_seq_show, 187 }; 188 189 static const struct seq_operations softnet_seq_ops = { 190 .start = softnet_seq_start, 191 .next = softnet_seq_next, 192 .stop = softnet_seq_stop, 193 .show = softnet_seq_show, 194 }; 195 196 static void *ptype_get_idx(loff_t pos) 197 { 198 struct packet_type *pt = NULL; 199 loff_t i = 0; 200 int t; 201 202 list_for_each_entry_rcu(pt, &ptype_all, list) { 203 if (i == pos) 204 return pt; 205 ++i; 206 } 207 208 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 209 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 210 if (i == pos) 211 return pt; 212 ++i; 213 } 214 } 215 return NULL; 216 } 217 218 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 219 __acquires(RCU) 220 { 221 rcu_read_lock(); 222 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; 223 } 224 225 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 226 { 227 struct packet_type *pt; 228 struct list_head *nxt; 229 int hash; 230 231 ++*pos; 232 if (v == SEQ_START_TOKEN) 233 return ptype_get_idx(0); 234 235 pt = v; 236 nxt = pt->list.next; 237 if (pt->type == htons(ETH_P_ALL)) { 238 if (nxt != &ptype_all) 239 goto found; 240 hash = 0; 241 nxt = ptype_base[0].next; 242 } else 243 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 244 245 while (nxt == &ptype_base[hash]) { 246 if (++hash >= PTYPE_HASH_SIZE) 247 return NULL; 248 nxt = ptype_base[hash].next; 249 } 250 found: 251 return list_entry(nxt, struct packet_type, list); 252 } 253 254 static void ptype_seq_stop(struct seq_file *seq, void *v) 255 __releases(RCU) 256 { 257 rcu_read_unlock(); 258 } 259 260 static int ptype_seq_show(struct seq_file *seq, void *v) 261 { 262 struct packet_type *pt = v; 263 264 if (v == SEQ_START_TOKEN) 265 seq_puts(seq, "Type Device Function\n"); 266 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { 267 if (pt->type == htons(ETH_P_ALL)) 268 seq_puts(seq, "ALL "); 269 else 270 seq_printf(seq, "%04x", ntohs(pt->type)); 271 272 seq_printf(seq, " %-8s %ps\n", 273 pt->dev ? pt->dev->name : "", pt->func); 274 } 275 276 return 0; 277 } 278 279 static const struct seq_operations ptype_seq_ops = { 280 .start = ptype_seq_start, 281 .next = ptype_seq_next, 282 .stop = ptype_seq_stop, 283 .show = ptype_seq_show, 284 }; 285 286 static int __net_init dev_proc_net_init(struct net *net) 287 { 288 int rc = -ENOMEM; 289 290 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 291 sizeof(struct seq_net_private))) 292 goto out; 293 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 294 &softnet_seq_ops)) 295 goto out_dev; 296 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 297 sizeof(struct seq_net_private))) 298 goto out_softnet; 299 300 if (wext_proc_init(net)) 301 goto out_ptype; 302 rc = 0; 303 out: 304 return rc; 305 out_ptype: 306 remove_proc_entry("ptype", net->proc_net); 307 out_softnet: 308 remove_proc_entry("softnet_stat", net->proc_net); 309 out_dev: 310 remove_proc_entry("dev", net->proc_net); 311 goto out; 312 } 313 314 static void __net_exit dev_proc_net_exit(struct net *net) 315 { 316 wext_proc_exit(net); 317 318 remove_proc_entry("ptype", net->proc_net); 319 remove_proc_entry("softnet_stat", net->proc_net); 320 remove_proc_entry("dev", net->proc_net); 321 } 322 323 static struct pernet_operations __net_initdata dev_proc_ops = { 324 .init = dev_proc_net_init, 325 .exit = dev_proc_net_exit, 326 }; 327 328 static int dev_mc_seq_show(struct seq_file *seq, void *v) 329 { 330 struct netdev_hw_addr *ha; 331 struct net_device *dev = v; 332 333 if (v == SEQ_START_TOKEN) 334 return 0; 335 336 netif_addr_lock_bh(dev); 337 netdev_for_each_mc_addr(ha, dev) { 338 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 339 dev->ifindex, dev->name, 340 ha->refcount, ha->global_use, 341 (int)dev->addr_len, ha->addr); 342 } 343 netif_addr_unlock_bh(dev); 344 return 0; 345 } 346 347 static const struct seq_operations dev_mc_seq_ops = { 348 .start = dev_seq_start, 349 .next = dev_seq_next, 350 .stop = dev_seq_stop, 351 .show = dev_mc_seq_show, 352 }; 353 354 static int __net_init dev_mc_net_init(struct net *net) 355 { 356 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 357 sizeof(struct seq_net_private))) 358 return -ENOMEM; 359 return 0; 360 } 361 362 static void __net_exit dev_mc_net_exit(struct net *net) 363 { 364 remove_proc_entry("dev_mcast", net->proc_net); 365 } 366 367 static struct pernet_operations __net_initdata dev_mc_net_ops = { 368 .init = dev_mc_net_init, 369 .exit = dev_mc_net_exit, 370 }; 371 372 int __init dev_proc_init(void) 373 { 374 int ret = register_pernet_subsys(&dev_proc_ops); 375 if (!ret) 376 return register_pernet_subsys(&dev_mc_net_ops); 377 return ret; 378 } 379