net/core/net-procfs.c

   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 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
  14 {
  15         struct net *net = seq_file_net(seq);
  16         struct net_device *dev;
  17         struct hlist_head *h;
  18         unsigned int count = 0, offset = get_offset(*pos);
  19
  20         h = &net->dev_index_head[get_bucket(*pos)];
  21         hlist_for_each_entry_rcu(dev, h, index_hlist) {
  22                 if (++count == offset)
  23                         return dev;
  24         }
  25
  26         return NULL;
  27 }
  28
  29 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
  30 {
  31         struct net_device *dev;
  32         unsigned int bucket;
  33
  34         do {
  35                 dev = dev_from_same_bucket(seq, pos);
  36                 if (dev)
  37                         return dev;
  38
  39                 bucket = get_bucket(*pos) + 1;
  40                 *pos = set_bucket_offset(bucket, 1);
  41         } while (bucket < NETDEV_HASHENTRIES);
  42
  43         return NULL;
  44 }
  45
  46 /*
  47  *      This is invoked by the /proc filesystem handler to display a device
  48  *      in detail.
  49  */
  50 static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
  51         __acquires(RCU)
  52 {
  53         rcu_read_lock();
  54         if (!*pos)
  55                 return SEQ_START_TOKEN;
  56
  57         if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
  58                 return NULL;
  59
  60         return dev_from_bucket(seq, pos);
  61 }
  62
  63 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  64 {
  65         ++*pos;
  66         return dev_from_bucket(seq, pos);
  67 }
  68
  69 static void dev_seq_stop(struct seq_file *seq, void *v)
  70         __releases(RCU)
  71 {
  72         rcu_read_unlock();
  73 }
  74
  75 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
  76 {
  77         struct rtnl_link_stats64 temp;
  78         const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
  79
  80         seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
  81                    "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
  82                    dev->name, stats->rx_bytes, stats->rx_packets,
  83                    stats->rx_errors,
  84                    stats->rx_dropped + stats->rx_missed_errors,
  85                    stats->rx_fifo_errors,
  86                    stats->rx_length_errors + stats->rx_over_errors +
  87                     stats->rx_crc_errors + stats->rx_frame_errors,
  88                    stats->rx_compressed, stats->multicast,
  89                    stats->tx_bytes, stats->tx_packets,
  90                    stats->tx_errors, stats->tx_dropped,
  91                    stats->tx_fifo_errors, stats->collisions,
  92                    stats->tx_carrier_errors +
  93                     stats->tx_aborted_errors +
  94                     stats->tx_window_errors +
  95                     stats->tx_heartbeat_errors,
  96                    stats->tx_compressed);
  97 }
  98
  99 /*
 100  *      Called from the PROCfs module. This now uses the new arbitrary sized
 101  *      /proc/net interface to create /proc/net/dev
 102  */
 103 static int dev_seq_show(struct seq_file *seq, void *v)
 104 {
 105         if (v == SEQ_START_TOKEN)
 106                 seq_puts(seq, "Inter-|   Receive                            "
 107                               "                    |  Transmit\n"
 108                               " face |bytes    packets errs drop fifo frame "
 109                               "compressed multicast|bytes    packets errs "
 110                               "drop fifo colls carrier compressed\n");
 111         else
 112                 dev_seq_printf_stats(seq, v);
 113         return 0;
 114 }
 115
 116 static u32 softnet_backlog_len(struct softnet_data *sd)
 117 {
 118         return skb_queue_len_lockless(&sd->input_pkt_queue) +
 119                skb_queue_len_lockless(&sd->process_queue);
 120 }
 121
 122 static struct softnet_data *softnet_get_online(loff_t *pos)
 123 {
 124         struct softnet_data *sd = NULL;
 125
 126         while (*pos < nr_cpu_ids)
 127                 if (cpu_online(*pos)) {
 128                         sd = &per_cpu(softnet_data, *pos);
 129                         break;
 130                 } else
 131                         ++*pos;
 132         return sd;
 133 }
 134
 135 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
 136 {
 137         return softnet_get_online(pos);
 138 }
 139
 140 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 141 {
 142         ++*pos;
 143         return softnet_get_online(pos);
 144 }
 145
 146 static void softnet_seq_stop(struct seq_file *seq, void *v)
 147 {
 148 }
 149
 150 static int softnet_seq_show(struct seq_file *seq, void *v)
 151 {
 152         struct softnet_data *sd = v;
 153         unsigned int flow_limit_count = 0;
 154
 155 #ifdef CONFIG_NET_FLOW_LIMIT
 156         struct sd_flow_limit *fl;
 157
 158         rcu_read_lock();
 159         fl = rcu_dereference(sd->flow_limit);
 160         if (fl)
 161                 flow_limit_count = fl->count;
 162         rcu_read_unlock();
 163 #endif
 164
 165         /* the index is the CPU id owing this sd. Since offline CPUs are not
 166          * displayed, it would be othrwise not trivial for the user-space
 167          * mapping the data a specific CPU
 168          */
 169         seq_printf(seq,
 170                    "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
 171                    sd->processed, sd->dropped, sd->time_squeeze, 0,
 172                    0, 0, 0, 0, /* was fastroute */
 173                    0,   /* was cpu_collision */
 174                    sd->received_rps, flow_limit_count,
 175                    softnet_backlog_len(sd), (int)seq->index);
 176         return 0;
 177 }
 178
 179 static const struct seq_operations dev_seq_ops = {
 180         .start = dev_seq_start,
 181         .next  = dev_seq_next,
 182         .stop  = dev_seq_stop,
 183         .show  = dev_seq_show,
 184 };
 185
 186 static const struct seq_operations softnet_seq_ops = {
 187         .start = softnet_seq_start,
 188         .next  = softnet_seq_next,
 189         .stop  = softnet_seq_stop,
 190         .show  = softnet_seq_show,
 191 };
 192
 193 static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
 194 {
 195         struct list_head *ptype_list = NULL;
 196         struct packet_type *pt = NULL;
 197         struct net_device *dev;
 198         loff_t i = 0;
 199         int t;
 200
 201         for_each_netdev_rcu(seq_file_net(seq), dev) {
 202                 ptype_list = &dev->ptype_all;
 203                 list_for_each_entry_rcu(pt, ptype_list, list) {
 204                         if (i == pos)
 205                                 return pt;
 206                         ++i;
 207                 }
 208         }
 209
 210         list_for_each_entry_rcu(pt, &ptype_all, list) {
 211                 if (i == pos)
 212                         return pt;
 213                 ++i;
 214         }
 215
 216         for (t = 0; t < PTYPE_HASH_SIZE; t++) {
 217                 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
 218                         if (i == pos)
 219                                 return pt;
 220                         ++i;
 221                 }
 222         }
 223         return NULL;
 224 }
 225
 226 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
 227         __acquires(RCU)
 228 {
 229         rcu_read_lock();
 230         return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 231 }
 232
 233 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 234 {
 235         struct net_device *dev;
 236         struct packet_type *pt;
 237         struct list_head *nxt;
 238         int hash;
 239
 240         ++*pos;
 241         if (v == SEQ_START_TOKEN)
 242                 return ptype_get_idx(seq, 0);
 243
 244         pt = v;
 245         nxt = pt->list.next;
 246         if (pt->dev) {
 247                 if (nxt != &pt->dev->ptype_all)
 248                         goto found;
 249
 250                 dev = pt->dev;
 251                 for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
 252                         if (!list_empty(&dev->ptype_all)) {
 253                                 nxt = dev->ptype_all.next;
 254                                 goto found;
 255                         }
 256                 }
 257
 258                 nxt = ptype_all.next;
 259                 goto ptype_all;
 260         }
 261
 262         if (pt->type == htons(ETH_P_ALL)) {
 263 ptype_all:
 264                 if (nxt != &ptype_all)
 265                         goto found;
 266                 hash = 0;
 267                 nxt = ptype_base[0].next;
 268         } else
 269                 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
 270
 271         while (nxt == &ptype_base[hash]) {
 272                 if (++hash >= PTYPE_HASH_SIZE)
 273                         return NULL;
 274                 nxt = ptype_base[hash].next;
 275         }
 276 found:
 277         return list_entry(nxt, struct packet_type, list);
 278 }
 279
 280 static void ptype_seq_stop(struct seq_file *seq, void *v)
 281         __releases(RCU)
 282 {
 283         rcu_read_unlock();
 284 }
 285
 286 static int ptype_seq_show(struct seq_file *seq, void *v)
 287 {
 288         struct packet_type *pt = v;
 289
 290         if (v == SEQ_START_TOKEN)
 291                 seq_puts(seq, "Type Device      Function\n");
 292         else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
 293                  (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
 294                 if (pt->type == htons(ETH_P_ALL))
 295                         seq_puts(seq, "ALL ");
 296                 else
 297                         seq_printf(seq, "%04x", ntohs(pt->type));
 298
 299                 seq_printf(seq, " %-8s %ps\n",
 300                            pt->dev ? pt->dev->name : "", pt->func);
 301         }
 302
 303         return 0;
 304 }
 305
 306 static const struct seq_operations ptype_seq_ops = {
 307         .start = ptype_seq_start,
 308         .next  = ptype_seq_next,
 309         .stop  = ptype_seq_stop,
 310         .show  = ptype_seq_show,
 311 };
 312
 313 static int __net_init dev_proc_net_init(struct net *net)
 314 {
 315         int rc = -ENOMEM;
 316
 317         if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
 318                         sizeof(struct seq_net_private)))
 319                 goto out;
 320         if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
 321                          &softnet_seq_ops))
 322                 goto out_dev;
 323         if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
 324                         sizeof(struct seq_net_private)))
 325                 goto out_softnet;
 326
 327         if (wext_proc_init(net))
 328                 goto out_ptype;
 329         rc = 0;
 330 out:
 331         return rc;
 332 out_ptype:
 333         remove_proc_entry("ptype", net->proc_net);
 334 out_softnet:
 335         remove_proc_entry("softnet_stat", net->proc_net);
 336 out_dev:
 337         remove_proc_entry("dev", net->proc_net);
 338         goto out;
 339 }
 340
 341 static void __net_exit dev_proc_net_exit(struct net *net)
 342 {
 343         wext_proc_exit(net);
 344
 345         remove_proc_entry("ptype", net->proc_net);
 346         remove_proc_entry("softnet_stat", net->proc_net);
 347         remove_proc_entry("dev", net->proc_net);
 348 }
 349
 350 static struct pernet_operations __net_initdata dev_proc_ops = {
 351         .init = dev_proc_net_init,
 352         .exit = dev_proc_net_exit,
 353 };
 354
 355 static int dev_mc_seq_show(struct seq_file *seq, void *v)
 356 {
 357         struct netdev_hw_addr *ha;
 358         struct net_device *dev = v;
 359
 360         if (v == SEQ_START_TOKEN)
 361                 return 0;
 362
 363         netif_addr_lock_bh(dev);
 364         netdev_for_each_mc_addr(ha, dev) {
 365                 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
 366                            dev->ifindex, dev->name,
 367                            ha->refcount, ha->global_use,
 368                            (int)dev->addr_len, ha->addr);
 369         }
 370         netif_addr_unlock_bh(dev);
 371         return 0;
 372 }
 373
 374 static const struct seq_operations dev_mc_seq_ops = {
 375         .start = dev_seq_start,
 376         .next  = dev_seq_next,
 377         .stop  = dev_seq_stop,
 378         .show  = dev_mc_seq_show,
 379 };
 380
 381 static int __net_init dev_mc_net_init(struct net *net)
 382 {
 383         if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
 384                         sizeof(struct seq_net_private)))
 385                 return -ENOMEM;
 386         return 0;
 387 }
 388
 389 static void __net_exit dev_mc_net_exit(struct net *net)
 390 {
 391         remove_proc_entry("dev_mcast", net->proc_net);
 392 }
 393
 394 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 395         .init = dev_mc_net_init,
 396         .exit = dev_mc_net_exit,
 397 };
 398
 399 int __init dev_proc_init(void)
 400 {
 401         int ret = register_pernet_subsys(&dev_proc_ops);
 402         if (!ret)
 403                 return register_pernet_subsys(&dev_mc_net_ops);
 404         return ret;
 405 }