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, 0444, 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 } 498