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 13extern struct list_head ptype_all __read_mostly; 14extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; 15 16static 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 32static 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 */ 53static 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 66static 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 72static void dev_seq_stop(struct seq_file *seq, void *v) 73 __releases(RCU) 74{ 75 rcu_read_unlock(); 76} 77 78static 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 */ 106static 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 119static 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 125static 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 138static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) 139{ 140 return softnet_get_online(pos); 141} 142 143static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) 144{ 145 ++*pos; 146 return softnet_get_online(pos); 147} 148 149static void softnet_seq_stop(struct seq_file *seq, void *v) 150{ 151} 152 153static 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 182static 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 189static 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 196static void *ptype_get_idx(struct seq_file *seq, loff_t pos) 197{ 198 struct list_head *ptype_list = NULL; 199 struct packet_type *pt = NULL; 200 struct net_device *dev; 201 loff_t i = 0; 202 int t; 203 204 for_each_netdev_rcu(seq_file_net(seq), dev) { 205 ptype_list = &dev->ptype_all; 206 list_for_each_entry_rcu(pt, ptype_list, list) { 207 if (i == pos) 208 return pt; 209 ++i; 210 } 211 } 212 213 list_for_each_entry_rcu(pt, &ptype_all, list) { 214 if (i == pos) 215 return pt; 216 ++i; 217 } 218 219 for (t = 0; t < PTYPE_HASH_SIZE; t++) { 220 list_for_each_entry_rcu(pt, &ptype_base[t], list) { 221 if (i == pos) 222 return pt; 223 ++i; 224 } 225 } 226 return NULL; 227} 228 229static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) 230 __acquires(RCU) 231{ 232 rcu_read_lock(); 233 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 234} 235 236static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) 237{ 238 struct net_device *dev; 239 struct packet_type *pt; 240 struct list_head *nxt; 241 int hash; 242 243 ++*pos; 244 if (v == SEQ_START_TOKEN) 245 return ptype_get_idx(seq, 0); 246 247 pt = v; 248 nxt = pt->list.next; 249 if (pt->dev) { 250 if (nxt != &pt->dev->ptype_all) 251 goto found; 252 253 dev = pt->dev; 254 for_each_netdev_continue_rcu(seq_file_net(seq), dev) { 255 if (!list_empty(&dev->ptype_all)) { 256 nxt = dev->ptype_all.next; 257 goto found; 258 } 259 } 260 261 nxt = ptype_all.next; 262 goto ptype_all; 263 } 264 265 if (pt->type == htons(ETH_P_ALL)) { 266ptype_all: 267 if (nxt != &ptype_all) 268 goto found; 269 hash = 0; 270 nxt = ptype_base[0].next; 271 } else 272 hash = ntohs(pt->type) & PTYPE_HASH_MASK; 273 274 while (nxt == &ptype_base[hash]) { 275 if (++hash >= PTYPE_HASH_SIZE) 276 return NULL; 277 nxt = ptype_base[hash].next; 278 } 279found: 280 return list_entry(nxt, struct packet_type, list); 281} 282 283static void ptype_seq_stop(struct seq_file *seq, void *v) 284 __releases(RCU) 285{ 286 rcu_read_unlock(); 287} 288 289static int ptype_seq_show(struct seq_file *seq, void *v) 290{ 291 struct packet_type *pt = v; 292 293 if (v == SEQ_START_TOKEN) 294 seq_puts(seq, "Type Device Function\n"); 295 else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) && 296 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) { 297 if (pt->type == htons(ETH_P_ALL)) 298 seq_puts(seq, "ALL "); 299 else 300 seq_printf(seq, "%04x", ntohs(pt->type)); 301 302 seq_printf(seq, " %-8s %ps\n", 303 pt->dev ? pt->dev->name : "", pt->func); 304 } 305 306 return 0; 307} 308 309static const struct seq_operations ptype_seq_ops = { 310 .start = ptype_seq_start, 311 .next = ptype_seq_next, 312 .stop = ptype_seq_stop, 313 .show = ptype_seq_show, 314}; 315 316static int __net_init dev_proc_net_init(struct net *net) 317{ 318 int rc = -ENOMEM; 319 320 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops, 321 sizeof(struct seq_net_private))) 322 goto out; 323 if (!proc_create_seq("softnet_stat", 0444, net->proc_net, 324 &softnet_seq_ops)) 325 goto out_dev; 326 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops, 327 sizeof(struct seq_net_private))) 328 goto out_softnet; 329 330 if (wext_proc_init(net)) 331 goto out_ptype; 332 rc = 0; 333out: 334 return rc; 335out_ptype: 336 remove_proc_entry("ptype", net->proc_net); 337out_softnet: 338 remove_proc_entry("softnet_stat", net->proc_net); 339out_dev: 340 remove_proc_entry("dev", net->proc_net); 341 goto out; 342} 343 344static void __net_exit dev_proc_net_exit(struct net *net) 345{ 346 wext_proc_exit(net); 347 348 remove_proc_entry("ptype", net->proc_net); 349 remove_proc_entry("softnet_stat", net->proc_net); 350 remove_proc_entry("dev", net->proc_net); 351} 352 353static struct pernet_operations __net_initdata dev_proc_ops = { 354 .init = dev_proc_net_init, 355 .exit = dev_proc_net_exit, 356}; 357 358static int dev_mc_seq_show(struct seq_file *seq, void *v) 359{ 360 struct netdev_hw_addr *ha; 361 struct net_device *dev = v; 362 363 if (v == SEQ_START_TOKEN) 364 return 0; 365 366 netif_addr_lock_bh(dev); 367 netdev_for_each_mc_addr(ha, dev) { 368 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n", 369 dev->ifindex, dev->name, 370 ha->refcount, ha->global_use, 371 (int)dev->addr_len, ha->addr); 372 } 373 netif_addr_unlock_bh(dev); 374 return 0; 375} 376 377static const struct seq_operations dev_mc_seq_ops = { 378 .start = dev_seq_start, 379 .next = dev_seq_next, 380 .stop = dev_seq_stop, 381 .show = dev_mc_seq_show, 382}; 383 384static int __net_init dev_mc_net_init(struct net *net) 385{ 386 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops, 387 sizeof(struct seq_net_private))) 388 return -ENOMEM; 389 return 0; 390} 391 392static void __net_exit dev_mc_net_exit(struct net *net) 393{ 394 remove_proc_entry("dev_mcast", net->proc_net); 395} 396 397static struct pernet_operations __net_initdata dev_mc_net_ops = { 398 .init = dev_mc_net_init, 399 .exit = dev_mc_net_exit, 400}; 401 402int __init dev_proc_init(void) 403{ 404 int ret = register_pernet_subsys(&dev_proc_ops); 405 if (!ret) 406 return register_pernet_subsys(&dev_mc_net_ops); 407 return ret; 408} 409