net/core/net-procfs.c

   1 #include <linux/netdevice.h>
   2 #include <linux/proc_fs.h>
   3 #include <linux/seq_file.h>
   4 #include <net/wext.h>
   5
   6 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
   7
   8 #define get_bucket(x) ((x) >> BUCKET_SPACE)
   9 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
  10 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
  11
  12 extern struct list_head ptype_all __read_mostly;
  13 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
  14
  15 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
  16 {
  17         struct net *net = seq_file_net(seq);
  18         struct net_device *dev;
  19         struct hlist_head *h;
  20         unsigned int count = 0, offset = get_offset(*pos);
  21
  22         h = &net->dev_name_head[get_bucket(*pos)];
  23         hlist_for_each_entry_rcu(dev, h, name_hlist) {
  24                 if (++count == offset)
  25                         return dev;
  26         }
  27
  28         return NULL;
  29 }
  30
  31 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
  32 {
  33         struct net_device *dev;
  34         unsigned int bucket;
  35
  36         do {
  37                 dev = dev_from_same_bucket(seq, pos);
  38                 if (dev)
  39                         return dev;
  40
  41                 bucket = get_bucket(*pos) + 1;
  42                 *pos = set_bucket_offset(bucket, 1);
  43         } while (bucket < NETDEV_HASHENTRIES);
  44
  45         return NULL;
  46 }
  47
  48 /*
  49  *      This is invoked by the /proc filesystem handler to display a device
  50  *      in detail.
  51  */
  52 static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
  53         __acquires(RCU)
  54 {
  55         rcu_read_lock();
  56         if (!*pos)
  57                 return SEQ_START_TOKEN;
  58
  59         if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
  60                 return NULL;
  61
  62         return dev_from_bucket(seq, pos);
  63 }
  64
  65 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  66 {
  67         ++*pos;
  68         return dev_from_bucket(seq, pos);
  69 }
  70
  71 static void dev_seq_stop(struct seq_file *seq, void *v)
  72         __releases(RCU)
  73 {
  74         rcu_read_unlock();
  75 }
  76
  77 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
  78 {
  79         struct rtnl_link_stats64 temp;
  80         const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
  81
  82         seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
  83                    "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
  84                    dev->name, stats->rx_bytes, stats->rx_packets,
  85                    stats->rx_errors,
  86                    stats->rx_dropped + stats->rx_missed_errors,
  87                    stats->rx_fifo_errors,
  88                    stats->rx_length_errors + stats->rx_over_errors +
  89                     stats->rx_crc_errors + stats->rx_frame_errors,
  90                    stats->rx_compressed, stats->multicast,
  91                    stats->tx_bytes, stats->tx_packets,
  92                    stats->tx_errors, stats->tx_dropped,
  93                    stats->tx_fifo_errors, stats->collisions,
  94                    stats->tx_carrier_errors +
  95                     stats->tx_aborted_errors +
  96                     stats->tx_window_errors +
  97                     stats->tx_heartbeat_errors,
  98                    stats->tx_compressed);
  99 }
 100
 101 /*
 102  *      Called from the PROCfs module. This now uses the new arbitrary sized
 103  *      /proc/net interface to create /proc/net/dev
 104  */
 105 static int dev_seq_show(struct seq_file *seq, void *v)
 106 {
 107         if (v == SEQ_START_TOKEN)
 108                 seq_puts(seq, "Inter-|   Receive                            "
 109                               "                    |  Transmit\n"
 110                               " face |bytes    packets errs drop fifo frame "
 111                               "compressed multicast|bytes    packets errs "
 112                               "drop fifo colls carrier compressed\n");
 113         else
 114                 dev_seq_printf_stats(seq, v);
 115         return 0;
 116 }
 117
 118 static struct softnet_data *softnet_get_online(loff_t *pos)
 119 {
 120         struct softnet_data *sd = NULL;
 121
 122         while (*pos < nr_cpu_ids)
 123                 if (cpu_online(*pos)) {
 124                         sd = &per_cpu(softnet_data, *pos);
 125                         break;
 126                 } else
 127                         ++*pos;
 128         return sd;
 129 }
 130
 131 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
 132 {
 133         return softnet_get_online(pos);
 134 }
 135
 136 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 137 {
 138         ++*pos;
 139         return softnet_get_online(pos);
 140 }
 141
 142 static void softnet_seq_stop(struct seq_file *seq, void *v)
 143 {
 144 }
 145
 146 static int softnet_seq_show(struct seq_file *seq, void *v)
 147 {
 148         struct softnet_data *sd = v;
 149
 150         seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
 151                    sd->processed, sd->dropped, sd->time_squeeze, 0,
 152                    0, 0, 0, 0, /* was fastroute */
 153                    sd->cpu_collision, sd->received_rps);
 154         return 0;
 155 }
 156
 157 static const struct seq_operations dev_seq_ops = {
 158         .start = dev_seq_start,
 159         .next  = dev_seq_next,
 160         .stop  = dev_seq_stop,
 161         .show  = dev_seq_show,
 162 };
 163
 164 static int dev_seq_open(struct inode *inode, struct file *file)
 165 {
 166         return seq_open_net(inode, file, &dev_seq_ops,
 167                             sizeof(struct seq_net_private));
 168 }
 169
 170 static const struct file_operations dev_seq_fops = {
 171         .owner   = THIS_MODULE,
 172         .open    = dev_seq_open,
 173         .read    = seq_read,
 174         .llseek  = seq_lseek,
 175         .release = seq_release_net,
 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 int softnet_seq_open(struct inode *inode, struct file *file)
 186 {
 187         return seq_open(file, &softnet_seq_ops);
 188 }
 189
 190 static const struct file_operations softnet_seq_fops = {
 191         .owner   = THIS_MODULE,
 192         .open    = softnet_seq_open,
 193         .read    = seq_read,
 194         .llseek  = seq_lseek,
 195         .release = seq_release,
 196 };
 197
 198 static void *ptype_get_idx(loff_t pos)
 199 {
 200         struct packet_type *pt = NULL;
 201         loff_t i = 0;
 202         int t;
 203
 204         list_for_each_entry_rcu(pt, &ptype_all, list) {
 205                 if (i == pos)
 206                         return pt;
 207                 ++i;
 208         }
 209
 210         for (t = 0; t < PTYPE_HASH_SIZE; t++) {
 211                 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
 212                         if (i == pos)
 213                                 return pt;
 214                         ++i;
 215                 }
 216         }
 217         return NULL;
 218 }
 219
 220 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
 221         __acquires(RCU)
 222 {
 223         rcu_read_lock();
 224         return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
 225 }
 226
 227 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 228 {
 229         struct packet_type *pt;
 230         struct list_head *nxt;
 231         int hash;
 232
 233         ++*pos;
 234         if (v == SEQ_START_TOKEN)
 235                 return ptype_get_idx(0);
 236
 237         pt = v;
 238         nxt = pt->list.next;
 239         if (pt->type == htons(ETH_P_ALL)) {
 240                 if (nxt != &ptype_all)
 241                         goto found;
 242                 hash = 0;
 243                 nxt = ptype_base[0].next;
 244         } else
 245                 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
 246
 247         while (nxt == &ptype_base[hash]) {
 248                 if (++hash >= PTYPE_HASH_SIZE)
 249                         return NULL;
 250                 nxt = ptype_base[hash].next;
 251         }
 252 found:
 253         return list_entry(nxt, struct packet_type, list);
 254 }
 255
 256 static void ptype_seq_stop(struct seq_file *seq, void *v)
 257         __releases(RCU)
 258 {
 259         rcu_read_unlock();
 260 }
 261
 262 static int ptype_seq_show(struct seq_file *seq, void *v)
 263 {
 264         struct packet_type *pt = v;
 265
 266         if (v == SEQ_START_TOKEN)
 267                 seq_puts(seq, "Type Device      Function\n");
 268         else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
 269                 if (pt->type == htons(ETH_P_ALL))
 270                         seq_puts(seq, "ALL ");
 271                 else
 272                         seq_printf(seq, "%04x", ntohs(pt->type));
 273
 274                 seq_printf(seq, " %-8s %pF\n",
 275                            pt->dev ? pt->dev->name : "", pt->func);
 276         }
 277
 278         return 0;
 279 }
 280
 281 static const struct seq_operations ptype_seq_ops = {
 282         .start = ptype_seq_start,
 283         .next  = ptype_seq_next,
 284         .stop  = ptype_seq_stop,
 285         .show  = ptype_seq_show,
 286 };
 287
 288 static int ptype_seq_open(struct inode *inode, struct file *file)
 289 {
 290         return seq_open_net(inode, file, &ptype_seq_ops,
 291                         sizeof(struct seq_net_private));
 292 }
 293
 294 static const struct file_operations ptype_seq_fops = {
 295         .owner   = THIS_MODULE,
 296         .open    = ptype_seq_open,
 297         .read    = seq_read,
 298         .llseek  = seq_lseek,
 299         .release = seq_release_net,
 300 };
 301
 302
 303 static int __net_init dev_proc_net_init(struct net *net)
 304 {
 305         int rc = -ENOMEM;
 306
 307         if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
 308                 goto out;
 309         if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
 310                          &softnet_seq_fops))
 311                 goto out_dev;
 312         if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
 313                 goto out_softnet;
 314
 315         if (wext_proc_init(net))
 316                 goto out_ptype;
 317         rc = 0;
 318 out:
 319         return rc;
 320 out_ptype:
 321         remove_proc_entry("ptype", net->proc_net);
 322 out_softnet:
 323         remove_proc_entry("softnet_stat", net->proc_net);
 324 out_dev:
 325         remove_proc_entry("dev", net->proc_net);
 326         goto out;
 327 }
 328
 329 static void __net_exit dev_proc_net_exit(struct net *net)
 330 {
 331         wext_proc_exit(net);
 332
 333         remove_proc_entry("ptype", net->proc_net);
 334         remove_proc_entry("softnet_stat", net->proc_net);
 335         remove_proc_entry("dev", net->proc_net);
 336 }
 337
 338 static struct pernet_operations __net_initdata dev_proc_ops = {
 339         .init = dev_proc_net_init,
 340         .exit = dev_proc_net_exit,
 341 };
 342
 343 static int dev_mc_seq_show(struct seq_file *seq, void *v)
 344 {
 345         struct netdev_hw_addr *ha;
 346         struct net_device *dev = v;
 347
 348         if (v == SEQ_START_TOKEN)
 349                 return 0;
 350
 351         netif_addr_lock_bh(dev);
 352         netdev_for_each_mc_addr(ha, dev) {
 353                 int i;
 354
 355                 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
 356                            dev->name, ha->refcount, ha->global_use);
 357
 358                 for (i = 0; i < dev->addr_len; i++)
 359                         seq_printf(seq, "%02x", ha->addr[i]);
 360
 361                 seq_putc(seq, '\n');
 362         }
 363         netif_addr_unlock_bh(dev);
 364         return 0;
 365 }
 366
 367 static const struct seq_operations dev_mc_seq_ops = {
 368         .start = dev_seq_start,
 369         .next  = dev_seq_next,
 370         .stop  = dev_seq_stop,
 371         .show  = dev_mc_seq_show,
 372 };
 373
 374 static int dev_mc_seq_open(struct inode *inode, struct file *file)
 375 {
 376         return seq_open_net(inode, file, &dev_mc_seq_ops,
 377                             sizeof(struct seq_net_private));
 378 }
 379
 380 static const struct file_operations dev_mc_seq_fops = {
 381         .owner   = THIS_MODULE,
 382         .open    = dev_mc_seq_open,
 383         .read    = seq_read,
 384         .llseek  = seq_lseek,
 385         .release = seq_release_net,
 386 };
 387
 388 static int __net_init dev_mc_net_init(struct net *net)
 389 {
 390         if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops))
 391                 return -ENOMEM;
 392         return 0;
 393 }
 394
 395 static void __net_exit dev_mc_net_exit(struct net *net)
 396 {
 397         remove_proc_entry("dev_mcast", net->proc_net);
 398 }
 399
 400 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 401         .init = dev_mc_net_init,
 402         .exit = dev_mc_net_exit,
 403 };
 404
 405 int __init dev_proc_init(void)
 406 {
 407         int ret = register_pernet_subsys(&dev_proc_ops);
 408         if (!ret)
 409                 return register_pernet_subsys(&dev_mc_net_ops);
 410         return ret;
 411 }