net/atm/proc.c

   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
  12 #include <linux/module.h> /* for EXPORT_SYMBOL */
  13 #include <linux/string.h>
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/stat.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/errno.h>
  21 #include <linux/atm.h>
  22 #include <linux/atmdev.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/atmclip.h>
  25 #include <linux/init.h> /* for __init */
  26 #include <linux/slab.h>
  27 #include <net/net_namespace.h>
  28 #include <net/atmclip.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/param.h> /* for HZ */
  31 #include <linux/atomic.h>
  32 #include "resources.h"
  33 #include "common.h" /* atm_proc_init prototype */
  34 #include "signaling.h" /* to get sigd - ugly too */
  35
  36 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
  37                                  size_t count, loff_t *pos);
  38
  39 static const struct file_operations proc_atm_dev_ops = {
  40         .read =         proc_dev_atm_read,
  41         .llseek =       noop_llseek,
  42 };
  43
  44 static void add_stats(struct seq_file *seq, const char *aal,
  45   const struct k_atm_aal_stats *stats)
  46 {
  47         seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
  48                    atomic_read(&stats->tx), atomic_read(&stats->tx_err),
  49                    atomic_read(&stats->rx), atomic_read(&stats->rx_err),
  50                    atomic_read(&stats->rx_drop));
  51 }
  52
  53 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
  54 {
  55         int i;
  56
  57         seq_printf(seq, "%3d %-8s", dev->number, dev->type);
  58         for (i = 0; i < ESI_LEN; i++)
  59                 seq_printf(seq, "%02x", dev->esi[i]);
  60         seq_puts(seq, "  ");
  61         add_stats(seq, "0", &dev->stats.aal0);
  62         seq_puts(seq, "  ");
  63         add_stats(seq, "5", &dev->stats.aal5);
  64         seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
  65         seq_putc(seq, '\n');
  66 }
  67
  68 struct vcc_state {
  69         int bucket;
  70         struct sock *sk;
  71         int family;
  72 };
  73
  74 static inline int compare_family(struct sock *sk, int family)
  75 {
  76         return !family || (sk->sk_family == family);
  77 }
  78
  79 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
  80 {
  81         struct sock *sk = *sock;
  82
  83         if (sk == SEQ_START_TOKEN) {
  84                 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
  85                         struct hlist_head *head = &vcc_hash[*bucket];
  86
  87                         sk = hlist_empty(head) ? NULL : __sk_head(head);
  88                         if (sk)
  89                                 break;
  90                 }
  91                 l--;
  92         }
  93 try_again:
  94         for (; sk; sk = sk_next(sk)) {
  95                 l -= compare_family(sk, family);
  96                 if (l < 0)
  97                         goto out;
  98         }
  99         if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
 100                 sk = sk_head(&vcc_hash[*bucket]);
 101                 goto try_again;
 102         }
 103         sk = SEQ_START_TOKEN;
 104 out:
 105         *sock = sk;
 106         return (l < 0);
 107 }
 108
 109 static inline void *vcc_walk(struct vcc_state *state, loff_t l)
 110 {
 111         return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
 112                state : NULL;
 113 }
 114
 115 static int __vcc_seq_open(struct inode *inode, struct file *file,
 116         int family, const struct seq_operations *ops)
 117 {
 118         struct vcc_state *state;
 119
 120         state = __seq_open_private(file, ops, sizeof(*state));
 121         if (state == NULL)
 122                 return -ENOMEM;
 123
 124         state->family = family;
 125         return 0;
 126 }
 127
 128 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
 129         __acquires(vcc_sklist_lock)
 130 {
 131         struct vcc_state *state = seq->private;
 132         loff_t left = *pos;
 133
 134         read_lock(&vcc_sklist_lock);
 135         state->sk = SEQ_START_TOKEN;
 136         return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
 137 }
 138
 139 static void vcc_seq_stop(struct seq_file *seq, void *v)
 140         __releases(vcc_sklist_lock)
 141 {
 142         read_unlock(&vcc_sklist_lock);
 143 }
 144
 145 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 146 {
 147         struct vcc_state *state = seq->private;
 148
 149         v = vcc_walk(state, 1);
 150         *pos += !!PTR_ERR(v);
 151         return v;
 152 }
 153
 154 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
 155 {
 156         static const char *const class_name[] = {
 157                 "off", "UBR", "CBR", "VBR", "ABR"};
 158         static const char *const aal_name[] = {
 159                 "---",  "1",    "2",    "3/4",  /*  0- 3 */
 160                 "???",  "5",    "???",  "???",  /*  4- 7 */
 161                 "???",  "???",  "???",  "???",  /*  8-11 */
 162                 "???",  "0",    "???",  "???"}; /* 12-15 */
 163
 164         seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
 165                    vcc->dev->number, vcc->vpi, vcc->vci,
 166                    vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
 167                    aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
 168                    class_name[vcc->qos.rxtp.traffic_class],
 169                    vcc->qos.txtp.min_pcr,
 170                    class_name[vcc->qos.txtp.traffic_class]);
 171         if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
 172                 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
 173                 struct net_device *dev;
 174
 175                 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
 176                 seq_printf(seq, "CLIP, Itf:%s, Encap:",
 177                     dev ? dev->name : "none?");
 178                 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
 179         }
 180         seq_putc(seq, '\n');
 181 }
 182
 183 static const char *vcc_state(struct atm_vcc *vcc)
 184 {
 185         static const char *const map[] = { ATM_VS2TXT_MAP };
 186
 187         return map[ATM_VF2VS(vcc->flags)];
 188 }
 189
 190 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 191 {
 192         struct sock *sk = sk_atm(vcc);
 193
 194         seq_printf(seq, "%pK ", vcc);
 195         if (!vcc->dev)
 196                 seq_printf(seq, "Unassigned    ");
 197         else
 198                 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
 199                         vcc->vci);
 200         switch (sk->sk_family) {
 201         case AF_ATMPVC:
 202                 seq_printf(seq, "PVC");
 203                 break;
 204         case AF_ATMSVC:
 205                 seq_printf(seq, "SVC");
 206                 break;
 207         default:
 208                 seq_printf(seq, "%3d", sk->sk_family);
 209         }
 210         seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n",
 211                    vcc->flags, sk->sk_err,
 212                    sk_wmem_alloc_get(sk), sk->sk_sndbuf,
 213                    sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
 214                    refcount_read(&sk->sk_refcnt));
 215 }
 216
 217 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
 218 {
 219         if (!vcc->dev)
 220                 seq_printf(seq, sizeof(void *) == 4 ?
 221                            "N/A@%pK%10s" : "N/A@%pK%2s", vcc, "");
 222         else
 223                 seq_printf(seq, "%3d %3d %5d         ",
 224                            vcc->dev->number, vcc->vpi, vcc->vci);
 225         seq_printf(seq, "%-10s ", vcc_state(vcc));
 226         seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
 227             *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
 228         if (*vcc->remote.sas_addr.prv) {
 229                 int i;
 230
 231                 for (i = 0; i < ATM_ESA_LEN; i++)
 232                         seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
 233         }
 234         seq_putc(seq, '\n');
 235 }
 236
 237 static int atm_dev_seq_show(struct seq_file *seq, void *v)
 238 {
 239         static char atm_dev_banner[] =
 240                 "Itf Type    ESI/\"MAC\"addr "
 241                 "AAL(TX,err,RX,err,drop) ...               [refcnt]\n";
 242
 243         if (v == &atm_devs)
 244                 seq_puts(seq, atm_dev_banner);
 245         else {
 246                 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
 247
 248                 atm_dev_info(seq, dev);
 249         }
 250         return 0;
 251 }
 252
 253 static const struct seq_operations atm_dev_seq_ops = {
 254         .start  = atm_dev_seq_start,
 255         .next   = atm_dev_seq_next,
 256         .stop   = atm_dev_seq_stop,
 257         .show   = atm_dev_seq_show,
 258 };
 259
 260 static int atm_dev_seq_open(struct inode *inode, struct file *file)
 261 {
 262         return seq_open(file, &atm_dev_seq_ops);
 263 }
 264
 265 static const struct file_operations devices_seq_fops = {
 266         .open           = atm_dev_seq_open,
 267         .read           = seq_read,
 268         .llseek         = seq_lseek,
 269         .release        = seq_release,
 270 };
 271
 272 static int pvc_seq_show(struct seq_file *seq, void *v)
 273 {
 274         static char atm_pvc_banner[] =
 275                 "Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)\n";
 276
 277         if (v == SEQ_START_TOKEN)
 278                 seq_puts(seq, atm_pvc_banner);
 279         else {
 280                 struct vcc_state *state = seq->private;
 281                 struct atm_vcc *vcc = atm_sk(state->sk);
 282
 283                 pvc_info(seq, vcc);
 284         }
 285         return 0;
 286 }
 287
 288 static const struct seq_operations pvc_seq_ops = {
 289         .start  = vcc_seq_start,
 290         .next   = vcc_seq_next,
 291         .stop   = vcc_seq_stop,
 292         .show   = pvc_seq_show,
 293 };
 294
 295 static int pvc_seq_open(struct inode *inode, struct file *file)
 296 {
 297         return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
 298 }
 299
 300 static const struct file_operations pvc_seq_fops = {
 301         .open           = pvc_seq_open,
 302         .read           = seq_read,
 303         .llseek         = seq_lseek,
 304         .release        = seq_release_private,
 305 };
 306
 307 static int vcc_seq_show(struct seq_file *seq, void *v)
 308 {
 309         if (v == SEQ_START_TOKEN) {
 310                 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
 311                         "Address ", "Itf VPI VCI   Fam Flags Reply "
 312                         "Send buffer     Recv buffer      [refcnt]\n");
 313         } else {
 314                 struct vcc_state *state = seq->private;
 315                 struct atm_vcc *vcc = atm_sk(state->sk);
 316
 317                 vcc_info(seq, vcc);
 318         }
 319         return 0;
 320 }
 321
 322 static const struct seq_operations vcc_seq_ops = {
 323         .start  = vcc_seq_start,
 324         .next   = vcc_seq_next,
 325         .stop   = vcc_seq_stop,
 326         .show   = vcc_seq_show,
 327 };
 328
 329 static int vcc_seq_open(struct inode *inode, struct file *file)
 330 {
 331         return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
 332 }
 333
 334 static const struct file_operations vcc_seq_fops = {
 335         .open           = vcc_seq_open,
 336         .read           = seq_read,
 337         .llseek         = seq_lseek,
 338         .release        = seq_release_private,
 339 };
 340
 341 static int svc_seq_show(struct seq_file *seq, void *v)
 342 {
 343         static const char atm_svc_banner[] =
 344                 "Itf VPI VCI           State      Remote\n";
 345
 346         if (v == SEQ_START_TOKEN)
 347                 seq_puts(seq, atm_svc_banner);
 348         else {
 349                 struct vcc_state *state = seq->private;
 350                 struct atm_vcc *vcc = atm_sk(state->sk);
 351
 352                 svc_info(seq, vcc);
 353         }
 354         return 0;
 355 }
 356
 357 static const struct seq_operations svc_seq_ops = {
 358         .start  = vcc_seq_start,
 359         .next   = vcc_seq_next,
 360         .stop   = vcc_seq_stop,
 361         .show   = svc_seq_show,
 362 };
 363
 364 static int svc_seq_open(struct inode *inode, struct file *file)
 365 {
 366         return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
 367 }
 368
 369 static const struct file_operations svc_seq_fops = {
 370         .open           = svc_seq_open,
 371         .read           = seq_read,
 372         .llseek         = seq_lseek,
 373         .release        = seq_release_private,
 374 };
 375
 376 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 377                                  size_t count, loff_t *pos)
 378 {
 379         struct atm_dev *dev;
 380         unsigned long page;
 381         int length;
 382
 383         if (count == 0)
 384                 return 0;
 385         page = get_zeroed_page(GFP_KERNEL);
 386         if (!page)
 387                 return -ENOMEM;
 388         dev = PDE_DATA(file_inode(file));
 389         if (!dev->ops->proc_read)
 390                 length = -EINVAL;
 391         else {
 392                 length = dev->ops->proc_read(dev, pos, (char *)page);
 393                 if (length > count)
 394                         length = -EINVAL;
 395         }
 396         if (length >= 0) {
 397                 if (copy_to_user(buf, (char *)page, length))
 398                         length = -EFAULT;
 399                 (*pos)++;
 400         }
 401         free_page(page);
 402         return length;
 403 }
 404
 405 struct proc_dir_entry *atm_proc_root;
 406 EXPORT_SYMBOL(atm_proc_root);
 407
 408
 409 int atm_proc_dev_register(struct atm_dev *dev)
 410 {
 411         int error;
 412
 413         /* No proc info */
 414         if (!dev->ops->proc_read)
 415                 return 0;
 416
 417         error = -ENOMEM;
 418         dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
 419         if (!dev->proc_name)
 420                 goto err_out;
 421
 422         dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
 423                                            &proc_atm_dev_ops, dev);
 424         if (!dev->proc_entry)
 425                 goto err_free_name;
 426         return 0;
 427
 428 err_free_name:
 429         kfree(dev->proc_name);
 430 err_out:
 431         return error;
 432 }
 433
 434 void atm_proc_dev_deregister(struct atm_dev *dev)
 435 {
 436         if (!dev->ops->proc_read)
 437                 return;
 438
 439         remove_proc_entry(dev->proc_name, atm_proc_root);
 440         kfree(dev->proc_name);
 441 }
 442
 443 static struct atm_proc_entry {
 444         char *name;
 445         const struct file_operations *proc_fops;
 446         struct proc_dir_entry *dirent;
 447 } atm_proc_ents[] = {
 448         { .name = "devices",    .proc_fops = &devices_seq_fops },
 449         { .name = "pvc",        .proc_fops = &pvc_seq_fops },
 450         { .name = "svc",        .proc_fops = &svc_seq_fops },
 451         { .name = "vc",         .proc_fops = &vcc_seq_fops },
 452         { .name = NULL,         .proc_fops = NULL }
 453 };
 454
 455 static void atm_proc_dirs_remove(void)
 456 {
 457         static struct atm_proc_entry *e;
 458
 459         for (e = atm_proc_ents; e->name; e++) {
 460                 if (e->dirent)
 461                         remove_proc_entry(e->name, atm_proc_root);
 462         }
 463         remove_proc_entry("atm", init_net.proc_net);
 464 }
 465
 466 int __init atm_proc_init(void)
 467 {
 468         static struct atm_proc_entry *e;
 469         int ret;
 470
 471         atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
 472         if (!atm_proc_root)
 473                 goto err_out;
 474         for (e = atm_proc_ents; e->name; e++) {
 475                 struct proc_dir_entry *dirent;
 476
 477                 dirent = proc_create(e->name, S_IRUGO,
 478                                      atm_proc_root, e->proc_fops);
 479                 if (!dirent)
 480                         goto err_out_remove;
 481                 e->dirent = dirent;
 482         }
 483         ret = 0;
 484 out:
 485         return ret;
 486
 487 err_out_remove:
 488         atm_proc_dirs_remove();
 489 err_out:
 490         ret = -ENOMEM;
 491         goto out;
 492 }
 493
 494 void atm_proc_exit(void)
 495 {
 496         atm_proc_dirs_remove();
 497 }