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Linux/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 }
424 

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