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                    0,   /* was cpu_collision */
 166                    sd->received_rps, flow_limit_count);
 167         return 0;
 168 }
 169
 170 static const struct seq_operations dev_seq_ops = {
 171         .start = dev_seq_start,
 172         .next  = dev_seq_next,
 173         .stop  = dev_seq_stop,
 174         .show  = dev_seq_show,
 175 };
 176
 177 static int dev_seq_open(struct inode *inode, struct file *file)
 178 {
 179         return seq_open_net(inode, file, &dev_seq_ops,
 180                             sizeof(struct seq_net_private));
 181 }
 182
 183 static const struct file_operations dev_seq_fops = {
 184         .owner   = THIS_MODULE,
 185         .open    = dev_seq_open,
 186         .read    = seq_read,
 187         .llseek  = seq_lseek,
 188         .release = seq_release_net,
 189 };
 190
 191 static const struct seq_operations softnet_seq_ops = {
 192         .start = softnet_seq_start,
 193         .next  = softnet_seq_next,
 194         .stop  = softnet_seq_stop,
 195         .show  = softnet_seq_show,
 196 };
 197
 198 static int softnet_seq_open(struct inode *inode, struct file *file)
 199 {
 200         return seq_open(file, &softnet_seq_ops);
 201 }
 202
 203 static const struct file_operations softnet_seq_fops = {
 204         .owner   = THIS_MODULE,
 205         .open    = softnet_seq_open,
 206         .read    = seq_read,
 207         .llseek  = seq_lseek,
 208         .release = seq_release,
 209 };
 210
 211 static void *ptype_get_idx(loff_t pos)
 212 {
 213         struct packet_type *pt = NULL;
 214         loff_t i = 0;
 215         int t;
 216
 217         list_for_each_entry_rcu(pt, &ptype_all, list) {
 218                 if (i == pos)
 219                         return pt;
 220                 ++i;
 221         }
 222
 223         for (t = 0; t < PTYPE_HASH_SIZE; t++) {
 224                 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
 225                         if (i == pos)
 226                                 return pt;
 227                         ++i;
 228                 }
 229         }
 230         return NULL;
 231 }
 232
 233 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
 234         __acquires(RCU)
 235 {
 236         rcu_read_lock();
 237         return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
 238 }
 239
 240 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 241 {
 242         struct packet_type *pt;
 243         struct list_head *nxt;
 244         int hash;
 245
 246         ++*pos;
 247         if (v == SEQ_START_TOKEN)
 248                 return ptype_get_idx(0);
 249
 250         pt = v;
 251         nxt = pt->list.next;
 252         if (pt->type == htons(ETH_P_ALL)) {
 253                 if (nxt != &ptype_all)
 254                         goto found;
 255                 hash = 0;
 256                 nxt = ptype_base[0].next;
 257         } else
 258                 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
 259
 260         while (nxt == &ptype_base[hash]) {
 261                 if (++hash >= PTYPE_HASH_SIZE)
 262                         return NULL;
 263                 nxt = ptype_base[hash].next;
 264         }
 265 found:
 266         return list_entry(nxt, struct packet_type, list);
 267 }
 268
 269 static void ptype_seq_stop(struct seq_file *seq, void *v)
 270         __releases(RCU)
 271 {
 272         rcu_read_unlock();
 273 }
 274
 275 static int ptype_seq_show(struct seq_file *seq, void *v)
 276 {
 277         struct packet_type *pt = v;
 278
 279         if (v == SEQ_START_TOKEN)
 280                 seq_puts(seq, "Type Device      Function\n");
 281         else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
 282                 if (pt->type == htons(ETH_P_ALL))
 283                         seq_puts(seq, "ALL ");
 284                 else
 285                         seq_printf(seq, "%04x", ntohs(pt->type));
 286
 287                 seq_printf(seq, " %-8s %pf\n",
 288                            pt->dev ? pt->dev->name : "", pt->func);
 289         }
 290
 291         return 0;
 292 }
 293
 294 static const struct seq_operations ptype_seq_ops = {
 295         .start = ptype_seq_start,
 296         .next  = ptype_seq_next,
 297         .stop  = ptype_seq_stop,
 298         .show  = ptype_seq_show,
 299 };
 300
 301 static int ptype_seq_open(struct inode *inode, struct file *file)
 302 {
 303         return seq_open_net(inode, file, &ptype_seq_ops,
 304                         sizeof(struct seq_net_private));
 305 }
 306
 307 static const struct file_operations ptype_seq_fops = {
 308         .owner   = THIS_MODULE,
 309         .open    = ptype_seq_open,
 310         .read    = seq_read,
 311         .llseek  = seq_lseek,
 312         .release = seq_release_net,
 313 };
 314
 315
 316 static int __net_init dev_proc_net_init(struct net *net)
 317 {
 318         int rc = -ENOMEM;
 319
 320         if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
 321                 goto out;
 322         if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
 323                          &softnet_seq_fops))
 324                 goto out_dev;
 325         if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
 326                 goto out_softnet;
 327
 328         if (wext_proc_init(net))
 329                 goto out_ptype;
 330         rc = 0;
 331 out:
 332         return rc;
 333 out_ptype:
 334         remove_proc_entry("ptype", net->proc_net);
 335 out_softnet:
 336         remove_proc_entry("softnet_stat", net->proc_net);
 337 out_dev:
 338         remove_proc_entry("dev", net->proc_net);
 339         goto out;
 340 }
 341
 342 static void __net_exit dev_proc_net_exit(struct net *net)
 343 {
 344         wext_proc_exit(net);
 345
 346         remove_proc_entry("ptype", net->proc_net);
 347         remove_proc_entry("softnet_stat", net->proc_net);
 348         remove_proc_entry("dev", net->proc_net);
 349 }
 350
 351 static struct pernet_operations __net_initdata dev_proc_ops = {
 352         .init = dev_proc_net_init,
 353         .exit = dev_proc_net_exit,
 354 };
 355
 356 static int dev_mc_seq_show(struct seq_file *seq, void *v)
 357 {
 358         struct netdev_hw_addr *ha;
 359         struct net_device *dev = v;
 360
 361         if (v == SEQ_START_TOKEN)
 362                 return 0;
 363
 364         netif_addr_lock_bh(dev);
 365         netdev_for_each_mc_addr(ha, dev) {
 366                 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
 367                            dev->ifindex, dev->name,
 368                            ha->refcount, ha->global_use,
 369                            (int)dev->addr_len, ha->addr);
 370         }
 371         netif_addr_unlock_bh(dev);
 372         return 0;
 373 }
 374
 375 static const struct seq_operations dev_mc_seq_ops = {
 376         .start = dev_seq_start,
 377         .next  = dev_seq_next,
 378         .stop  = dev_seq_stop,
 379         .show  = dev_mc_seq_show,
 380 };
 381
 382 static int dev_mc_seq_open(struct inode *inode, struct file *file)
 383 {
 384         return seq_open_net(inode, file, &dev_mc_seq_ops,
 385                             sizeof(struct seq_net_private));
 386 }
 387
 388 static const struct file_operations dev_mc_seq_fops = {
 389         .owner   = THIS_MODULE,
 390         .open    = dev_mc_seq_open,
 391         .read    = seq_read,
 392         .llseek  = seq_lseek,
 393         .release = seq_release_net,
 394 };
 395
 396 static int __net_init dev_mc_net_init(struct net *net)
 397 {
 398         if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops))
 399                 return -ENOMEM;
 400         return 0;
 401 }
 402
 403 static void __net_exit dev_mc_net_exit(struct net *net)
 404 {
 405         remove_proc_entry("dev_mcast", net->proc_net);
 406 }
 407
 408 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 409         .init = dev_mc_net_init,
 410         .exit = dev_mc_net_exit,
 411 };
 412
 413 int __init dev_proc_init(void)
 414 {
 415         int ret = register_pernet_subsys(&dev_proc_ops);
 416         if (!ret)
 417                 return register_pernet_subsys(&dev_mc_net_ops);
 418         return ret;
 419 }