proc.c 9.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /* net/atm/proc.c - ATM /proc interface
  3. *
  4. * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
  5. *
  6. * seq_file api usage by romieu@fr.zoreil.com
  7. *
  8. * Evaluating the efficiency of the whole thing if left as an exercise to
  9. * the reader.
  10. */
  11. #include <linux/module.h> /* for EXPORT_SYMBOL */
  12. #include <linux/string.h>
  13. #include <linux/types.h>
  14. #include <linux/mm.h>
  15. #include <linux/fs.h>
  16. #include <linux/stat.h>
  17. #include <linux/proc_fs.h>
  18. #include <linux/seq_file.h>
  19. #include <linux/errno.h>
  20. #include <linux/atm.h>
  21. #include <linux/atmdev.h>
  22. #include <linux/netdevice.h>
  23. #include <linux/atmclip.h>
  24. #include <linux/init.h> /* for __init */
  25. #include <linux/slab.h>
  26. #include <net/net_namespace.h>
  27. #include <net/atmclip.h>
  28. #include <linux/uaccess.h>
  29. #include <linux/param.h> /* for HZ */
  30. #include <linux/atomic.h>
  31. #include "resources.h"
  32. #include "common.h" /* atm_proc_init prototype */
  33. #include "signaling.h" /* to get sigd - ugly too */
  34. static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
  35. size_t count, loff_t *pos);
  36. static const struct proc_ops atm_dev_proc_ops = {
  37. .proc_read = proc_dev_atm_read,
  38. .proc_lseek = noop_llseek,
  39. };
  40. static void add_stats(struct seq_file *seq, const char *aal,
  41. const struct k_atm_aal_stats *stats)
  42. {
  43. seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
  44. atomic_read(&stats->tx), atomic_read(&stats->tx_err),
  45. atomic_read(&stats->rx), atomic_read(&stats->rx_err),
  46. atomic_read(&stats->rx_drop));
  47. }
  48. static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
  49. {
  50. int i;
  51. seq_printf(seq, "%3d %-8s", dev->number, dev->type);
  52. for (i = 0; i < ESI_LEN; i++)
  53. seq_printf(seq, "%02x", dev->esi[i]);
  54. seq_puts(seq, " ");
  55. add_stats(seq, "0", &dev->stats.aal0);
  56. seq_puts(seq, " ");
  57. add_stats(seq, "5", &dev->stats.aal5);
  58. seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
  59. seq_putc(seq, '\n');
  60. }
  61. struct vcc_state {
  62. int bucket;
  63. struct sock *sk;
  64. };
  65. static inline int compare_family(struct sock *sk, int family)
  66. {
  67. return !family || (sk->sk_family == family);
  68. }
  69. static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
  70. {
  71. struct sock *sk = *sock;
  72. if (sk == SEQ_START_TOKEN) {
  73. for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
  74. struct hlist_head *head = &vcc_hash[*bucket];
  75. sk = hlist_empty(head) ? NULL : __sk_head(head);
  76. if (sk)
  77. break;
  78. }
  79. l--;
  80. }
  81. try_again:
  82. for (; sk; sk = sk_next(sk)) {
  83. l -= compare_family(sk, family);
  84. if (l < 0)
  85. goto out;
  86. }
  87. if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
  88. sk = sk_head(&vcc_hash[*bucket]);
  89. goto try_again;
  90. }
  91. sk = SEQ_START_TOKEN;
  92. out:
  93. *sock = sk;
  94. return (l < 0);
  95. }
  96. static inline void *vcc_walk(struct seq_file *seq, loff_t l)
  97. {
  98. struct vcc_state *state = seq->private;
  99. int family = (uintptr_t)(PDE_DATA(file_inode(seq->file)));
  100. return __vcc_walk(&state->sk, family, &state->bucket, l) ?
  101. state : NULL;
  102. }
  103. static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
  104. __acquires(vcc_sklist_lock)
  105. {
  106. struct vcc_state *state = seq->private;
  107. loff_t left = *pos;
  108. read_lock(&vcc_sklist_lock);
  109. state->sk = SEQ_START_TOKEN;
  110. return left ? vcc_walk(seq, left) : SEQ_START_TOKEN;
  111. }
  112. static void vcc_seq_stop(struct seq_file *seq, void *v)
  113. __releases(vcc_sklist_lock)
  114. {
  115. read_unlock(&vcc_sklist_lock);
  116. }
  117. static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  118. {
  119. v = vcc_walk(seq, 1);
  120. (*pos)++;
  121. return v;
  122. }
  123. static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
  124. {
  125. static const char *const class_name[] = {
  126. "off", "UBR", "CBR", "VBR", "ABR"};
  127. static const char *const aal_name[] = {
  128. "---", "1", "2", "3/4", /* 0- 3 */
  129. "???", "5", "???", "???", /* 4- 7 */
  130. "???", "???", "???", "???", /* 8-11 */
  131. "???", "0", "???", "???"}; /* 12-15 */
  132. seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
  133. vcc->dev->number, vcc->vpi, vcc->vci,
  134. vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
  135. aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
  136. class_name[vcc->qos.rxtp.traffic_class],
  137. vcc->qos.txtp.min_pcr,
  138. class_name[vcc->qos.txtp.traffic_class]);
  139. if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
  140. struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
  141. struct net_device *dev;
  142. dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
  143. seq_printf(seq, "CLIP, Itf:%s, Encap:",
  144. dev ? dev->name : "none?");
  145. seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
  146. }
  147. seq_putc(seq, '\n');
  148. }
  149. static const char *vcc_state(struct atm_vcc *vcc)
  150. {
  151. static const char *const map[] = { ATM_VS2TXT_MAP };
  152. return map[ATM_VF2VS(vcc->flags)];
  153. }
  154. static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
  155. {
  156. struct sock *sk = sk_atm(vcc);
  157. seq_printf(seq, "%pK ", vcc);
  158. if (!vcc->dev)
  159. seq_printf(seq, "Unassigned ");
  160. else
  161. seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
  162. vcc->vci);
  163. switch (sk->sk_family) {
  164. case AF_ATMPVC:
  165. seq_printf(seq, "PVC");
  166. break;
  167. case AF_ATMSVC:
  168. seq_printf(seq, "SVC");
  169. break;
  170. default:
  171. seq_printf(seq, "%3d", sk->sk_family);
  172. }
  173. seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n",
  174. vcc->flags, sk->sk_err,
  175. sk_wmem_alloc_get(sk), sk->sk_sndbuf,
  176. sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
  177. refcount_read(&sk->sk_refcnt));
  178. }
  179. static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
  180. {
  181. if (!vcc->dev)
  182. seq_printf(seq, sizeof(void *) == 4 ?
  183. "N/A@%pK%10s" : "N/A@%pK%2s", vcc, "");
  184. else
  185. seq_printf(seq, "%3d %3d %5d ",
  186. vcc->dev->number, vcc->vpi, vcc->vci);
  187. seq_printf(seq, "%-10s ", vcc_state(vcc));
  188. seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
  189. *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
  190. if (*vcc->remote.sas_addr.prv) {
  191. int i;
  192. for (i = 0; i < ATM_ESA_LEN; i++)
  193. seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
  194. }
  195. seq_putc(seq, '\n');
  196. }
  197. static int atm_dev_seq_show(struct seq_file *seq, void *v)
  198. {
  199. static char atm_dev_banner[] =
  200. "Itf Type ESI/\"MAC\"addr "
  201. "AAL(TX,err,RX,err,drop) ... [refcnt]\n";
  202. if (v == &atm_devs)
  203. seq_puts(seq, atm_dev_banner);
  204. else {
  205. struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
  206. atm_dev_info(seq, dev);
  207. }
  208. return 0;
  209. }
  210. static const struct seq_operations atm_dev_seq_ops = {
  211. .start = atm_dev_seq_start,
  212. .next = atm_dev_seq_next,
  213. .stop = atm_dev_seq_stop,
  214. .show = atm_dev_seq_show,
  215. };
  216. static int pvc_seq_show(struct seq_file *seq, void *v)
  217. {
  218. static char atm_pvc_banner[] =
  219. "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n";
  220. if (v == SEQ_START_TOKEN)
  221. seq_puts(seq, atm_pvc_banner);
  222. else {
  223. struct vcc_state *state = seq->private;
  224. struct atm_vcc *vcc = atm_sk(state->sk);
  225. pvc_info(seq, vcc);
  226. }
  227. return 0;
  228. }
  229. static const struct seq_operations pvc_seq_ops = {
  230. .start = vcc_seq_start,
  231. .next = vcc_seq_next,
  232. .stop = vcc_seq_stop,
  233. .show = pvc_seq_show,
  234. };
  235. static int vcc_seq_show(struct seq_file *seq, void *v)
  236. {
  237. if (v == SEQ_START_TOKEN) {
  238. seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
  239. "Address ", "Itf VPI VCI Fam Flags Reply "
  240. "Send buffer Recv buffer [refcnt]\n");
  241. } else {
  242. struct vcc_state *state = seq->private;
  243. struct atm_vcc *vcc = atm_sk(state->sk);
  244. vcc_info(seq, vcc);
  245. }
  246. return 0;
  247. }
  248. static const struct seq_operations vcc_seq_ops = {
  249. .start = vcc_seq_start,
  250. .next = vcc_seq_next,
  251. .stop = vcc_seq_stop,
  252. .show = vcc_seq_show,
  253. };
  254. static int svc_seq_show(struct seq_file *seq, void *v)
  255. {
  256. static const char atm_svc_banner[] =
  257. "Itf VPI VCI State Remote\n";
  258. if (v == SEQ_START_TOKEN)
  259. seq_puts(seq, atm_svc_banner);
  260. else {
  261. struct vcc_state *state = seq->private;
  262. struct atm_vcc *vcc = atm_sk(state->sk);
  263. svc_info(seq, vcc);
  264. }
  265. return 0;
  266. }
  267. static const struct seq_operations svc_seq_ops = {
  268. .start = vcc_seq_start,
  269. .next = vcc_seq_next,
  270. .stop = vcc_seq_stop,
  271. .show = svc_seq_show,
  272. };
  273. static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
  274. size_t count, loff_t *pos)
  275. {
  276. struct atm_dev *dev;
  277. unsigned long page;
  278. int length;
  279. if (count == 0)
  280. return 0;
  281. page = get_zeroed_page(GFP_KERNEL);
  282. if (!page)
  283. return -ENOMEM;
  284. dev = PDE_DATA(file_inode(file));
  285. if (!dev->ops->proc_read)
  286. length = -EINVAL;
  287. else {
  288. length = dev->ops->proc_read(dev, pos, (char *)page);
  289. if (length > count)
  290. length = -EINVAL;
  291. }
  292. if (length >= 0) {
  293. if (copy_to_user(buf, (char *)page, length))
  294. length = -EFAULT;
  295. (*pos)++;
  296. }
  297. free_page(page);
  298. return length;
  299. }
  300. struct proc_dir_entry *atm_proc_root;
  301. EXPORT_SYMBOL(atm_proc_root);
  302. int atm_proc_dev_register(struct atm_dev *dev)
  303. {
  304. int error;
  305. /* No proc info */
  306. if (!dev->ops->proc_read)
  307. return 0;
  308. error = -ENOMEM;
  309. dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
  310. if (!dev->proc_name)
  311. goto err_out;
  312. dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
  313. &atm_dev_proc_ops, dev);
  314. if (!dev->proc_entry)
  315. goto err_free_name;
  316. return 0;
  317. err_free_name:
  318. kfree(dev->proc_name);
  319. err_out:
  320. return error;
  321. }
  322. void atm_proc_dev_deregister(struct atm_dev *dev)
  323. {
  324. if (!dev->ops->proc_read)
  325. return;
  326. remove_proc_entry(dev->proc_name, atm_proc_root);
  327. kfree(dev->proc_name);
  328. }
  329. int __init atm_proc_init(void)
  330. {
  331. atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
  332. if (!atm_proc_root)
  333. return -ENOMEM;
  334. proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops);
  335. proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops,
  336. sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC);
  337. proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops,
  338. sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC);
  339. proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops,
  340. sizeof(struct vcc_state), NULL);
  341. return 0;
  342. }
  343. void atm_proc_exit(void)
  344. {
  345. remove_proc_subtree("atm", init_net.proc_net);
  346. }