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 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 }