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