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         unsigned int flow_limit_count = 0;
 150
 151 #ifdef CONFIG_NET_FLOW_LIMIT
 152         struct sd_flow_limit *fl;
 153
 154         rcu_read_lock();
 155         fl = rcu_dereference(sd->flow_limit);
 156         if (fl)
 157                 flow_limit_count = fl->count;
 158         rcu_read_unlock();
 159 #endif
 160
 161         seq_printf(seq,
 162                    "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
 163                    sd->processed, sd->dropped, sd->time_squeeze, 0,
 164                    0, 0, 0, 0, /* was fastroute */
 165                    sd->cpu_collision, sd->received_rps, flow_limit_count);
 166         return 0;
 167 }
 168
 169 static const struct seq_operations dev_seq_ops = {
 170         .start = dev_seq_start,
 171         .next  = dev_seq_next,
 172         .stop  = dev_seq_stop,
 173         .show  = dev_seq_show,
 174 };
 175
 176 static int dev_seq_open(struct inode *inode, struct file *file)
 177 {
 178         return seq_open_net(inode, file, &dev_seq_ops,
 179                             sizeof(struct seq_net_private));
 180 }
 181
 182 static const struct file_operations dev_seq_fops = {
 183         .owner   = THIS_MODULE,
 184         .open    = dev_seq_open,
 185         .read    = seq_read,
 186         .llseek  = seq_lseek,
 187         .release = seq_release_net,
 188 };
 189
 190 static const struct seq_operations softnet_seq_ops = {
 191         .start = softnet_seq_start,
 192         .next  = softnet_seq_next,
 193         .stop  = softnet_seq_stop,
 194         .show  = softnet_seq_show,
 195 };
 196
 197 static int softnet_seq_open(struct inode *inode, struct file *file)
 198 {
 199         return seq_open(file, &softnet_seq_ops);
 200 }
 201
 202 static const struct file_operations softnet_seq_fops = {
 203         .owner   = THIS_MODULE,
 204         .open    = softnet_seq_open,
 205         .read    = seq_read,
 206         .llseek  = seq_lseek,
 207         .release = seq_release,
 208 };
 209
 210 static void *ptype_get_idx(loff_t pos)
 211 {
 212         struct packet_type *pt = NULL;
 213         loff_t i = 0;
 214         int t;
 215
 216         list_for_each_entry_rcu(pt, &ptype_all, list) {
 217                 if (i == pos)
 218                         return pt;
 219                 ++i;
 220         }
 221
 222         for (t = 0; t < PTYPE_HASH_SIZE; t++) {
 223                 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
 224                         if (i == pos)
 225                                 return pt;
 226                         ++i;
 227                 }
 228         }
 229         return NULL;
 230 }
 231
 232 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
 233         __acquires(RCU)
 234 {
 235         rcu_read_lock();
 236         return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
 237 }
 238
 239 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 240 {
 241         struct packet_type *pt;
 242         struct list_head *nxt;
 243         int hash;
 244
 245         ++*pos;
 246         if (v == SEQ_START_TOKEN)
 247                 return ptype_get_idx(0);
 248
 249         pt = v;
 250         nxt = pt->list.next;
 251         if (pt->type == htons(ETH_P_ALL)) {
 252                 if (nxt != &ptype_all)
 253                         goto found;
 254                 hash = 0;
 255                 nxt = ptype_base[0].next;
 256         } else
 257                 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
 258
 259         while (nxt == &ptype_base[hash]) {
 260                 if (++hash >= PTYPE_HASH_SIZE)
 261                         return NULL;
 262                 nxt = ptype_base[hash].next;
 263         }
 264 found:
 265         return list_entry(nxt, struct packet_type, list);
 266 }
 267
 268 static void ptype_seq_stop(struct seq_file *seq, void *v)
 269         __releases(RCU)
 270 {
 271         rcu_read_unlock();
 272 }
 273
 274 static int ptype_seq_show(struct seq_file *seq, void *v)
 275 {
 276         struct packet_type *pt = v;
 277
 278         if (v == SEQ_START_TOKEN)
 279                 seq_puts(seq, "Type Device      Function\n");
 280         else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
 281                 if (pt->type == htons(ETH_P_ALL))
 282                         seq_puts(seq, "ALL ");
 283                 else
 284                         seq_printf(seq, "%04x", ntohs(pt->type));
 285
 286                 seq_printf(seq, " %-8s %pf\n",
 287                            pt->dev ? pt->dev->name : "", pt->func);
 288         }
 289
 290         return 0;
 291 }
 292
 293 static const struct seq_operations ptype_seq_ops = {
 294         .start = ptype_seq_start,
 295         .next  = ptype_seq_next,
 296         .stop  = ptype_seq_stop,
 297         .show  = ptype_seq_show,
 298 };
 299
 300 static int ptype_seq_open(struct inode *inode, struct file *file)
 301 {
 302         return seq_open_net(inode, file, &ptype_seq_ops,
 303                         sizeof(struct seq_net_private));
 304 }
 305
 306 static const struct file_operations ptype_seq_fops = {
 307         .owner   = THIS_MODULE,
 308         .open    = ptype_seq_open,
 309         .read    = seq_read,
 310         .llseek  = seq_lseek,
 311         .release = seq_release_net,
 312 };
 313
 314
 315 static int __net_init dev_proc_net_init(struct net *net)
 316 {
 317         int rc = -ENOMEM;
 318
 319         if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
 320                 goto out;
 321         if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
 322                          &softnet_seq_fops))
 323                 goto out_dev;
 324         if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
 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                 int i;
 366
 367                 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
 368                            dev->name, ha->refcount, ha->global_use);
 369
 370                 for (i = 0; i < dev->addr_len; i++)
 371                         seq_printf(seq, "%02x", ha->addr[i]);
 372
 373                 seq_putc(seq, '\n');
 374         }
 375         netif_addr_unlock_bh(dev);
 376         return 0;
 377 }
 378
 379 static const struct seq_operations dev_mc_seq_ops = {
 380         .start = dev_seq_start,
 381         .next  = dev_seq_next,
 382         .stop  = dev_seq_stop,
 383         .show  = dev_mc_seq_show,
 384 };
 385
 386 static int dev_mc_seq_open(struct inode *inode, struct file *file)
 387 {
 388         return seq_open_net(inode, file, &dev_mc_seq_ops,
 389                             sizeof(struct seq_net_private));
 390 }
 391
 392 static const struct file_operations dev_mc_seq_fops = {
 393         .owner   = THIS_MODULE,
 394         .open    = dev_mc_seq_open,
 395         .read    = seq_read,
 396         .llseek  = seq_lseek,
 397         .release = seq_release_net,
 398 };
 399
 400 static int __net_init dev_mc_net_init(struct net *net)
 401 {
 402         if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops))
 403                 return -ENOMEM;
 404         return 0;
 405 }
 406
 407 static void __net_exit dev_mc_net_exit(struct net *net)
 408 {
 409         remove_proc_entry("dev_mcast", net->proc_net);
 410 }
 411
 412 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 413         .init = dev_mc_net_init,
 414         .exit = dev_mc_net_exit,
 415 };
 416
 417 int __init dev_proc_init(void)
 418 {
 419         int ret = register_pernet_subsys(&dev_proc_ops);
 420         if (!ret)
 421                 return register_pernet_subsys(&dev_mc_net_ops);
 422         return ret;
 423 }