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 *const class_name[] =
 155                 {"off","UBR","CBR","VBR","ABR"};
 156         static const char *const aal_name[] = {
 157                 "---",  "1",    "2",    "3/4",  /*  0- 3 */
 158                 "???",  "5",    "???",  "???",  /*  4- 7 */
 159                 "???",  "???",  "???",  "???",  /*  8-11 */
 160                 "???",  "0",    "???",  "???"}; /* 12-15 */
 161
 162         seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
 163             vcc->dev->number,vcc->vpi,vcc->vci,
 164             vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
 165             aal_name[vcc->qos.aal],vcc->qos.rxtp.min_pcr,
 166             class_name[vcc->qos.rxtp.traffic_class],vcc->qos.txtp.min_pcr,
 167             class_name[vcc->qos.txtp.traffic_class]);
 168         if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
 169                 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
 170                 struct net_device *dev;
 171
 172                 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
 173                 seq_printf(seq, "CLIP, Itf:%s, Encap:",
 174                     dev ? dev->name : "none?");
 175                 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
 176         }
 177         seq_putc(seq, '\n');
 178 }
 179
 180 static const char *vcc_state(struct atm_vcc *vcc)
 181 {
 182         static const char *const map[] = { ATM_VS2TXT_MAP };
 183
 184         return map[ATM_VF2VS(vcc->flags)];
 185 }
 186
 187 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 188 {
 189         struct sock *sk = sk_atm(vcc);
 190
 191         seq_printf(seq, "%p ", vcc);
 192         if (!vcc->dev)
 193                 seq_printf(seq, "Unassigned    ");
 194         else
 195                 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
 196                         vcc->vci);
 197         switch (sk->sk_family) {
 198                 case AF_ATMPVC:
 199                         seq_printf(seq, "PVC");
 200                         break;
 201                 case AF_ATMSVC:
 202                         seq_printf(seq, "SVC");
 203                         break;
 204                 default:
 205                         seq_printf(seq, "%3d", sk->sk_family);
 206         }
 207         seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err,
 208                   sk_wmem_alloc_get(sk), sk->sk_sndbuf,
 209                   sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
 210                   atomic_read(&sk->sk_refcnt));
 211 }
 212
 213 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
 214 {
 215         if (!vcc->dev)
 216                 seq_printf(seq, sizeof(void *) == 4 ?
 217                            "N/A@%p%10s" : "N/A@%p%2s", vcc, "");
 218         else
 219                 seq_printf(seq, "%3d %3d %5d         ",
 220                            vcc->dev->number, vcc->vpi, vcc->vci);
 221         seq_printf(seq, "%-10s ", vcc_state(vcc));
 222         seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
 223             *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
 224         if (*vcc->remote.sas_addr.prv) {
 225                 int i;
 226
 227                 for (i = 0; i < ATM_ESA_LEN; i++)
 228                         seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
 229         }
 230         seq_putc(seq, '\n');
 231 }
 232
 233 static int atm_dev_seq_show(struct seq_file *seq, void *v)
 234 {
 235         static char atm_dev_banner[] =
 236                 "Itf Type    ESI/\"MAC\"addr "
 237                 "AAL(TX,err,RX,err,drop) ...               [refcnt]\n";
 238
 239         if (v == SEQ_START_TOKEN)
 240                 seq_puts(seq, atm_dev_banner);
 241         else {
 242                 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
 243
 244                 atm_dev_info(seq, dev);
 245         }
 246         return 0;
 247 }
 248
 249 static const struct seq_operations atm_dev_seq_ops = {
 250         .start  = atm_dev_seq_start,
 251         .next   = atm_dev_seq_next,
 252         .stop   = atm_dev_seq_stop,
 253         .show   = atm_dev_seq_show,
 254 };
 255
 256 static int atm_dev_seq_open(struct inode *inode, struct file *file)
 257 {
 258         return seq_open(file, &atm_dev_seq_ops);
 259 }
 260
 261 static const struct file_operations devices_seq_fops = {
 262         .open           = atm_dev_seq_open,
 263         .read           = seq_read,
 264         .llseek         = seq_lseek,
 265         .release        = seq_release,
 266 };
 267
 268 static int pvc_seq_show(struct seq_file *seq, void *v)
 269 {
 270         static char atm_pvc_banner[] =
 271                 "Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)\n";
 272
 273         if (v == SEQ_START_TOKEN)
 274                 seq_puts(seq, atm_pvc_banner);
 275         else {
 276                 struct vcc_state *state = seq->private;
 277                 struct atm_vcc *vcc = atm_sk(state->sk);
 278
 279                 pvc_info(seq, vcc);
 280         }
 281         return 0;
 282 }
 283
 284 static const struct seq_operations pvc_seq_ops = {
 285         .start  = vcc_seq_start,
 286         .next   = vcc_seq_next,
 287         .stop   = vcc_seq_stop,
 288         .show   = pvc_seq_show,
 289 };
 290
 291 static int pvc_seq_open(struct inode *inode, struct file *file)
 292 {
 293         return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
 294 }
 295
 296 static const struct file_operations pvc_seq_fops = {
 297         .open           = pvc_seq_open,
 298         .read           = seq_read,
 299         .llseek         = seq_lseek,
 300         .release        = seq_release_private,
 301 };
 302
 303 static int vcc_seq_show(struct seq_file *seq, void *v)
 304 {
 305         if (v == SEQ_START_TOKEN) {
 306                 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
 307                         "Address ", "Itf VPI VCI   Fam Flags Reply "
 308                         "Send buffer     Recv buffer      [refcnt]\n");
 309         } else {
 310                 struct vcc_state *state = seq->private;
 311                 struct atm_vcc *vcc = atm_sk(state->sk);
 312
 313                 vcc_info(seq, vcc);
 314         }
 315         return 0;
 316 }
 317
 318 static const struct seq_operations vcc_seq_ops = {
 319         .start  = vcc_seq_start,
 320         .next   = vcc_seq_next,
 321         .stop   = vcc_seq_stop,
 322         .show   = vcc_seq_show,
 323 };
 324
 325 static int vcc_seq_open(struct inode *inode, struct file *file)
 326 {
 327         return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
 328 }
 329
 330 static const struct file_operations vcc_seq_fops = {
 331         .open           = vcc_seq_open,
 332         .read           = seq_read,
 333         .llseek         = seq_lseek,
 334         .release        = seq_release_private,
 335 };
 336
 337 static int svc_seq_show(struct seq_file *seq, void *v)
 338 {
 339         static const char atm_svc_banner[] =
 340                 "Itf VPI VCI           State      Remote\n";
 341
 342         if (v == SEQ_START_TOKEN)
 343                 seq_puts(seq, atm_svc_banner);
 344         else {
 345                 struct vcc_state *state = seq->private;
 346                 struct atm_vcc *vcc = atm_sk(state->sk);
 347
 348                 svc_info(seq, vcc);
 349         }
 350         return 0;
 351 }
 352
 353 static const struct seq_operations svc_seq_ops = {
 354         .start  = vcc_seq_start,
 355         .next   = vcc_seq_next,
 356         .stop   = vcc_seq_stop,
 357         .show   = svc_seq_show,
 358 };
 359
 360 static int svc_seq_open(struct inode *inode, struct file *file)
 361 {
 362         return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
 363 }
 364
 365 static const struct file_operations svc_seq_fops = {
 366         .open           = svc_seq_open,
 367         .read           = seq_read,
 368         .llseek         = seq_lseek,
 369         .release        = seq_release_private,
 370 };
 371
 372 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 373                                  size_t count, loff_t *pos)
 374 {
 375         struct atm_dev *dev;
 376         unsigned long page;
 377         int length;
 378
 379         if (count == 0) return 0;
 380         page = get_zeroed_page(GFP_KERNEL);
 381         if (!page) return -ENOMEM;
 382         dev = PDE(file->f_path.dentry->d_inode)->data;
 383         if (!dev->ops->proc_read)
 384                 length = -EINVAL;
 385         else {
 386                 length = dev->ops->proc_read(dev,pos,(char *) page);
 387                 if (length > count) length = -EINVAL;
 388         }
 389         if (length >= 0) {
 390                 if (copy_to_user(buf,(char *) page,length)) length = -EFAULT;
 391                 (*pos)++;
 392         }
 393         free_page(page);
 394         return length;
 395 }
 396
 397
 398 struct proc_dir_entry *atm_proc_root;
 399 EXPORT_SYMBOL(atm_proc_root);
 400
 401
 402 int atm_proc_dev_register(struct atm_dev *dev)
 403 {
 404         int digits,num;
 405         int error;
 406
 407         /* No proc info */
 408         if (!dev->ops->proc_read)
 409                 return 0;
 410
 411         error = -ENOMEM;
 412         digits = 0;
 413         for (num = dev->number; num; num /= 10) digits++;
 414         if (!digits) digits++;
 415
 416         dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL);
 417         if (!dev->proc_name)
 418                 goto err_out;
 419         sprintf(dev->proc_name,"%s:%d",dev->type, dev->number);
 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 err_free_name:
 427         kfree(dev->proc_name);
 428 err_out:
 429         return error;
 430 }
 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 }