net/atm/proc.c

   1 /* net/atm/proc.c - ATM /proc interface
   2  *
   3  * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
   4  *
   5  * seq_file api usage by romieu@fr.zoreil.com
   6  *
   7  * Evaluating the efficiency of the whole thing if left as an exercise to
   8  * the reader.
   9  */
  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 <asm/atomic.h>
  31 #include "resources.h"
  32 #include "common.h" /* atm_proc_init prototype */
  33 #include "signaling.h" /* to get sigd - ugly too */
  34
  35 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
  36                                  size_t count, loff_t *pos);
  37
  38 static const struct file_operations proc_atm_dev_ops = {
  39         .owner =        THIS_MODULE,
  40         .read =         proc_dev_atm_read,
  41 };
  42
  43 static void add_stats(struct seq_file *seq, const char *aal,
  44   const struct k_atm_aal_stats *stats)
  45 {
  46         seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
  47                    atomic_read(&stats->tx), atomic_read(&stats->tx_err),
  48                    atomic_read(&stats->rx), atomic_read(&stats->rx_err),
  49                    atomic_read(&stats->rx_drop));
  50 }
  51
  52 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
  53 {
  54         int i;
  55
  56         seq_printf(seq, "%3d %-8s", dev->number, dev->type);
  57         for (i = 0; i < ESI_LEN; i++)
  58                 seq_printf(seq, "%02x", dev->esi[i]);
  59         seq_puts(seq, "  ");
  60         add_stats(seq, "0", &dev->stats.aal0);
  61         seq_puts(seq, "  ");
  62         add_stats(seq, "5", &dev->stats.aal5);
  63         seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt));
  64         seq_putc(seq, '\n');
  65 }
  66
  67 struct vcc_state {
  68         int bucket;
  69         struct sock *sk;
  70         int family;
  71 };
  72
  73 static inline int compare_family(struct sock *sk, int family)
  74 {
  75         return !family || (sk->sk_family == family);
  76 }
  77
  78 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
  79 {
  80         struct sock *sk = *sock;
  81
  82         if (sk == SEQ_START_TOKEN) {
  83                 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
  84                         struct hlist_head *head = &vcc_hash[*bucket];
  85
  86                         sk = hlist_empty(head) ? NULL : __sk_head(head);
  87                         if (sk)
  88                                 break;
  89                 }
  90                 l--;
  91         }
  92 try_again:
  93         for (; sk; sk = sk_next(sk)) {
  94                 l -= compare_family(sk, family);
  95                 if (l < 0)
  96                         goto out;
  97         }
  98         if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
  99                 sk = sk_head(&vcc_hash[*bucket]);
 100                 goto try_again;
 101         }
 102         sk = SEQ_START_TOKEN;
 103 out:
 104         *sock = sk;
 105         return (l < 0);
 106 }
 107
 108 static inline void *vcc_walk(struct vcc_state *state, loff_t l)
 109 {
 110         return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
 111                state : NULL;
 112 }
 113
 114 static int __vcc_seq_open(struct inode *inode, struct file *file,
 115         int family, const struct seq_operations *ops)
 116 {
 117         struct vcc_state *state;
 118
 119         state = __seq_open_private(file, ops, sizeof(*state));
 120         if (state == NULL)
 121                 return -ENOMEM;
 122
 123         state->family = family;
 124         return 0;
 125 }
 126
 127 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
 128         __acquires(vcc_sklist_lock)
 129 {
 130         struct vcc_state *state = seq->private;
 131         loff_t left = *pos;
 132
 133         read_lock(&vcc_sklist_lock);
 134         state->sk = SEQ_START_TOKEN;
 135         return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
 136 }
 137
 138 static void vcc_seq_stop(struct seq_file *seq, void *v)
 139         __releases(vcc_sklist_lock)
 140 {
 141         read_unlock(&vcc_sklist_lock);
 142 }
 143
 144 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 145 {
 146         struct vcc_state *state = seq->private;
 147
 148         v = vcc_walk(state, 1);
 149         *pos += !!PTR_ERR(v);
 150         return v;
 151 }
 152
 153 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
 154 {
 155         static const char *const class_name[] = {
 156                 "off", "UBR", "CBR", "VBR", "ABR"};
 157         static const char *const aal_name[] = {
 158                 "---",  "1",    "2",    "3/4",  /*  0- 3 */
 159                 "???",  "5",    "???",  "???",  /*  4- 7 */
 160                 "???",  "???",  "???",  "???",  /*  8-11 */
 161                 "???",  "0",    "???",  "???"}; /* 12-15 */
 162
 163         seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
 164                    vcc->dev->number, vcc->vpi, vcc->vci,
 165                    vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
 166                    aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
 167                    class_name[vcc->qos.rxtp.traffic_class],
 168                    vcc->qos.txtp.min_pcr,
 169                    class_name[vcc->qos.txtp.traffic_class]);
 170         if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
 171                 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
 172                 struct net_device *dev;
 173
 174                 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
 175                 seq_printf(seq, "CLIP, Itf:%s, Encap:",
 176                     dev ? dev->name : "none?");
 177                 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
 178         }
 179         seq_putc(seq, '\n');
 180 }
 181
 182 static const char *vcc_state(struct atm_vcc *vcc)
 183 {
 184         static const char *const map[] = { ATM_VS2TXT_MAP };
 185
 186         return map[ATM_VF2VS(vcc->flags)];
 187 }
 188
 189 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 190 {
 191         struct sock *sk = sk_atm(vcc);
 192
 193         seq_printf(seq, "%p ", vcc);
 194         if (!vcc->dev)
 195                 seq_printf(seq, "Unassigned    ");
 196         else
 197                 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
 198                         vcc->vci);
 199         switch (sk->sk_family) {
 200         case AF_ATMPVC:
 201                 seq_printf(seq, "PVC");
 202                 break;
 203         case AF_ATMSVC:
 204                 seq_printf(seq, "SVC");
 205                 break;
 206         default:
 207                 seq_printf(seq, "%3d", sk->sk_family);
 208         }
 209         seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n",
 210                    vcc->flags, sk->sk_err,
 211                    sk_wmem_alloc_get(sk), sk->sk_sndbuf,
 212                    sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
 213                    atomic_read(&sk->sk_refcnt));
 214 }
 215
 216 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
 217 {
 218         if (!vcc->dev)
 219                 seq_printf(seq, sizeof(void *) == 4 ?
 220                            "N/A@%p%10s" : "N/A@%p%2s", vcc, "");
 221         else
 222                 seq_printf(seq, "%3d %3d %5d         ",
 223                            vcc->dev->number, vcc->vpi, vcc->vci);
 224         seq_printf(seq, "%-10s ", vcc_state(vcc));
 225         seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
 226             *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
 227         if (*vcc->remote.sas_addr.prv) {
 228                 int i;
 229
 230                 for (i = 0; i < ATM_ESA_LEN; i++)
 231                         seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
 232         }
 233         seq_putc(seq, '\n');
 234 }
 235
 236 static int atm_dev_seq_show(struct seq_file *seq, void *v)
 237 {
 238         static char atm_dev_banner[] =
 239                 "Itf Type    ESI/\"MAC\"addr "
 240                 "AAL(TX,err,RX,err,drop) ...               [refcnt]\n";
 241
 242         if (v == &atm_devs)
 243                 seq_puts(seq, atm_dev_banner);
 244         else {
 245                 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
 246
 247                 atm_dev_info(seq, dev);
 248         }
 249         return 0;
 250 }
 251
 252 static const struct seq_operations atm_dev_seq_ops = {
 253         .start  = atm_dev_seq_start,
 254         .next   = atm_dev_seq_next,
 255         .stop   = atm_dev_seq_stop,
 256         .show   = atm_dev_seq_show,
 257 };
 258
 259 static int atm_dev_seq_open(struct inode *inode, struct file *file)
 260 {
 261         return seq_open(file, &atm_dev_seq_ops);
 262 }
 263
 264 static const struct file_operations devices_seq_fops = {
 265         .open           = atm_dev_seq_open,
 266         .read           = seq_read,
 267         .llseek         = seq_lseek,
 268         .release        = seq_release,
 269 };
 270
 271 static int pvc_seq_show(struct seq_file *seq, void *v)
 272 {
 273         static char atm_pvc_banner[] =
 274                 "Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)\n";
 275
 276         if (v == SEQ_START_TOKEN)
 277                 seq_puts(seq, atm_pvc_banner);
 278         else {
 279                 struct vcc_state *state = seq->private;
 280                 struct atm_vcc *vcc = atm_sk(state->sk);
 281
 282                 pvc_info(seq, vcc);
 283         }
 284         return 0;
 285 }
 286
 287 static const struct seq_operations pvc_seq_ops = {
 288         .start  = vcc_seq_start,
 289         .next   = vcc_seq_next,
 290         .stop   = vcc_seq_stop,
 291         .show   = pvc_seq_show,
 292 };
 293
 294 static int pvc_seq_open(struct inode *inode, struct file *file)
 295 {
 296         return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
 297 }
 298
 299 static const struct file_operations pvc_seq_fops = {
 300         .open           = pvc_seq_open,
 301         .read           = seq_read,
 302         .llseek         = seq_lseek,
 303         .release        = seq_release_private,
 304 };
 305
 306 static int vcc_seq_show(struct seq_file *seq, void *v)
 307 {
 308         if (v == SEQ_START_TOKEN) {
 309                 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
 310                         "Address ", "Itf VPI VCI   Fam Flags Reply "
 311                         "Send buffer     Recv buffer      [refcnt]\n");
 312         } else {
 313                 struct vcc_state *state = seq->private;
 314                 struct atm_vcc *vcc = atm_sk(state->sk);
 315
 316                 vcc_info(seq, vcc);
 317         }
 318         return 0;
 319 }
 320
 321 static const struct seq_operations vcc_seq_ops = {
 322         .start  = vcc_seq_start,
 323         .next   = vcc_seq_next,
 324         .stop   = vcc_seq_stop,
 325         .show   = vcc_seq_show,
 326 };
 327
 328 static int vcc_seq_open(struct inode *inode, struct file *file)
 329 {
 330         return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
 331 }
 332
 333 static const struct file_operations vcc_seq_fops = {
 334         .open           = vcc_seq_open,
 335         .read           = seq_read,
 336         .llseek         = seq_lseek,
 337         .release        = seq_release_private,
 338 };
 339
 340 static int svc_seq_show(struct seq_file *seq, void *v)
 341 {
 342         static const char atm_svc_banner[] =
 343                 "Itf VPI VCI           State      Remote\n";
 344
 345         if (v == SEQ_START_TOKEN)
 346                 seq_puts(seq, atm_svc_banner);
 347         else {
 348                 struct vcc_state *state = seq->private;
 349                 struct atm_vcc *vcc = atm_sk(state->sk);
 350
 351                 svc_info(seq, vcc);
 352         }
 353         return 0;
 354 }
 355
 356 static const struct seq_operations svc_seq_ops = {
 357         .start  = vcc_seq_start,
 358         .next   = vcc_seq_next,
 359         .stop   = vcc_seq_stop,
 360         .show   = svc_seq_show,
 361 };
 362
 363 static int svc_seq_open(struct inode *inode, struct file *file)
 364 {
 365         return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
 366 }
 367
 368 static const struct file_operations svc_seq_fops = {
 369         .open           = svc_seq_open,
 370         .read           = seq_read,
 371         .llseek         = seq_lseek,
 372         .release        = seq_release_private,
 373 };
 374
 375 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 376                                  size_t count, loff_t *pos)
 377 {
 378         struct atm_dev *dev;
 379         unsigned long page;
 380         int length;
 381
 382         if (count == 0)
 383                 return 0;
 384         page = get_zeroed_page(GFP_KERNEL);
 385         if (!page)
 386                 return -ENOMEM;
 387         dev = PDE(file->f_path.dentry->d_inode)->data;
 388         if (!dev->ops->proc_read)
 389                 length = -EINVAL;
 390         else {
 391                 length = dev->ops->proc_read(dev, pos, (char *)page);
 392                 if (length > count)
 393                         length = -EINVAL;
 394         }
 395         if (length >= 0) {
 396                 if (copy_to_user(buf, (char *)page, length))
 397                         length = -EFAULT;
 398                 (*pos)++;
 399         }
 400         free_page(page);
 401         return length;
 402 }
 403
 404 struct proc_dir_entry *atm_proc_root;
 405 EXPORT_SYMBOL(atm_proc_root);
 406
 407
 408 int atm_proc_dev_register(struct atm_dev *dev)
 409 {
 410         int error;
 411
 412         /* No proc info */
 413         if (!dev->ops->proc_read)
 414                 return 0;
 415
 416         error = -ENOMEM;
 417         dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
 418         if (!dev->proc_name)
 419                 goto err_out;
 420
 421         dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
 422                                            &proc_atm_dev_ops, dev);
 423         if (!dev->proc_entry)
 424                 goto err_free_name;
 425         return 0;
 426
 427 err_free_name:
 428         kfree(dev->proc_name);
 429 err_out:
 430         return error;
 431 }
 432
 433 void atm_proc_dev_deregister(struct atm_dev *dev)
 434 {
 435         if (!dev->ops->proc_read)
 436                 return;
 437
 438         remove_proc_entry(dev->proc_name, atm_proc_root);
 439         kfree(dev->proc_name);
 440 }
 441
 442 static struct atm_proc_entry {
 443         char *name;
 444         const struct file_operations *proc_fops;
 445         struct proc_dir_entry *dirent;
 446 } atm_proc_ents[] = {
 447         { .name = "devices",    .proc_fops = &devices_seq_fops },
 448         { .name = "pvc",        .proc_fops = &pvc_seq_fops },
 449         { .name = "svc",        .proc_fops = &svc_seq_fops },
 450         { .name = "vc",         .proc_fops = &vcc_seq_fops },
 451         { .name = NULL,         .proc_fops = NULL }
 452 };
 453
 454 static void atm_proc_dirs_remove(void)
 455 {
 456         static struct atm_proc_entry *e;
 457
 458         for (e = atm_proc_ents; e->name; e++) {
 459                 if (e->dirent)
 460                         remove_proc_entry(e->name, atm_proc_root);
 461         }
 462         proc_net_remove(&init_net, "atm");
 463 }
 464
 465 int __init atm_proc_init(void)
 466 {
 467         static struct atm_proc_entry *e;
 468         int ret;
 469
 470         atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
 471         if (!atm_proc_root)
 472                 goto err_out;
 473         for (e = atm_proc_ents; e->name; e++) {
 474                 struct proc_dir_entry *dirent;
 475
 476                 dirent = proc_create(e->name, S_IRUGO,
 477                                      atm_proc_root, e->proc_fops);
 478                 if (!dirent)
 479                         goto err_out_remove;
 480                 e->dirent = dirent;
 481         }
 482         ret = 0;
 483 out:
 484         return ret;
 485
 486 err_out_remove:
 487         atm_proc_dirs_remove();
 488 err_out:
 489         ret = -ENOMEM;
 490         goto out;
 491 }
 492
 493 void atm_proc_exit(void)
 494 {
 495         atm_proc_dirs_remove();
 496 }