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 const struct seq_operations softnet_seq_ops = { 179 .start = softnet_seq_start, 180 .next = softnet_seq_next, 181 .stop = softnet_seq_stop, 182 .show = softnet_seq_show, 183 }; 184 185 static void *ptype_get_idx(loff_t pos) 186 { 187 struct packet_type *pt = NULL; 188 loff_t i = 0; 189 int t; 190 191 list_for_each_entry_rcu(pt, &ptype_all, list) { 192 if (i == pos) 193 return pt; 194 ++i; 195 } 196 197 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 198 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 199 if (i == pos) 200 return pt; 201 ++i; 202 } 203 } 204 return NULL; 205 } 206 207 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 208 __acquires(RCU) 209 { 210 rcu_read_lock(); 211 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; 212 } 213 214 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 215 { 216 struct packet_type *pt; 217 struct list_head *nxt; 218 int hash; 219 220 ++*pos; 221 if (v == SEQ_START_TOKEN) 222 return ptype_get_idx(0); 223 224 pt = v; 225 nxt = pt->list.next; 226 if (pt->type == htons(ETH_P_ALL)) { 227 if (nxt != &ptype_all) 228 goto found; 229 hash = 0; 230 nxt = ptype_base[0].next; 231 } else 232 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 233 234 while (nxt == &ptype_base[hash]) { 235 if (++hash >= PTYPE_HASH_SIZE) 236 return NULL; 237 nxt = ptype_base[hash].next; 238 } 239 found: 240 return list_entry(nxt, struct packet_type, list); 241 } 242 243 static void ptype_seq_stop(struct seq_file *seq, void *v) 244 __releases(RCU) 245 { 246 rcu_read_unlock(); 247 } 248 249 static int ptype_seq_show(struct seq_file *seq, void *v) 250 { 251 struct packet_type *pt = v; 252 253 if (v == SEQ_START_TOKEN) 254 seq_puts(seq, "Type Device Function\n"); 255 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { 256 if (pt->type == htons(ETH_P_ALL)) 257 seq_puts(seq, "ALL "); 258 else 259 seq_printf(seq, "%04x", ntohs(pt->type)); 260 261 seq_printf(seq, " %-8s %pf\n", 262 pt->dev ? pt->dev->name : "", pt->func); 263 } 264 265 return 0; 266 } 267 268 static const struct seq_operations ptype_seq_ops = { 269 .start = ptype_seq_start, 270 .next = ptype_seq_next, 271 .stop = ptype_seq_stop, 272 .show = ptype_seq_show, 273 }; 274 275 static int __net_init dev_proc_net_init(struct net *net) 276 { 277 int rc = -ENOMEM; 278 279 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 280 sizeof(struct seq_net_private))) 281 goto out; 282 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 283 &softnet_seq_ops)) 284 goto out_dev; 285 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 286 sizeof(struct seq_net_private))) 287 goto out_softnet; 288 289 if (wext_proc_init(net)) 290 goto out_ptype; 291 rc = 0; 292 out: 293 return rc; 294 out_ptype: 295 remove_proc_entry("ptype", net->proc_net); 296 out_softnet: 297 remove_proc_entry("softnet_stat", net->proc_net); 298 out_dev: 299 remove_proc_entry("dev", net->proc_net); 300 goto out; 301 } 302 303 static void __net_exit dev_proc_net_exit(struct net *net) 304 { 305 wext_proc_exit(net); 306 307 remove_proc_entry("ptype", net->proc_net); 308 remove_proc_entry("softnet_stat", net->proc_net); 309 remove_proc_entry("dev", net->proc_net); 310 } 311 312 static struct pernet_operations __net_initdata dev_proc_ops = { 313 .init = dev_proc_net_init, 314 .exit = dev_proc_net_exit, 315 }; 316 317 static int dev_mc_seq_show(struct seq_file *seq, void *v) 318 { 319 struct netdev_hw_addr *ha; 320 struct net_device *dev = v; 321 322 if (v == SEQ_START_TOKEN) 323 return 0; 324 325 netif_addr_lock_bh(dev); 326 netdev_for_each_mc_addr(ha, dev) { 327 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 328 dev->ifindex, dev->name, 329 ha->refcount, ha->global_use, 330 (int)dev->addr_len, ha->addr); 331 } 332 netif_addr_unlock_bh(dev); 333 return 0; 334 } 335 336 static const struct seq_operations dev_mc_seq_ops = { 337 .start = dev_seq_start, 338 .next = dev_seq_next, 339 .stop = dev_seq_stop, 340 .show = dev_mc_seq_show, 341 }; 342 343 static int __net_init dev_mc_net_init(struct net *net) 344 { 345 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 346 sizeof(struct seq_net_private))) 347 return -ENOMEM; 348 return 0; 349 } 350 351 static void __net_exit dev_mc_net_exit(struct net *net) 352 { 353 remove_proc_entry("dev_mcast", net->proc_net); 354 } 355 356 static struct pernet_operations __net_initdata dev_mc_net_ops = { 357 .init = dev_mc_net_init, 358 .exit = dev_mc_net_exit, 359 }; 360 361 int __init dev_proc_init(void) 362 { 363 int ret = register_pernet_subsys(&dev_proc_ops); 364 if (!ret) 365 return register_pernet_subsys(&dev_mc_net_ops); 366 return ret; 367 } 368