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 == (void *)1) { 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 = (void *)1; 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 struct seq_file *seq; 118 int rc = -ENOMEM; 119 120 state = kmalloc(sizeof(*state), GFP_KERNEL); 121 if (!state) 122 goto out; 123 124 rc = seq_open(file, ops); 125 if (rc) 126 goto out_kfree; 127 128 state->family = family; 129 130 seq = file->private_data; 131 seq->private = state; 132 out: 133 return rc; 134 out_kfree: 135 kfree(state); 136 goto out; 137 } 138 139 static int vcc_seq_release(struct inode *inode, struct file *file) 140 { 141 return seq_release_private(inode, file); 142 } 143 144 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) 145 __acquires(vcc_sklist_lock) 146 { 147 struct vcc_state *state = seq->private; 148 loff_t left = *pos; 149 150 read_lock(&vcc_sklist_lock); 151 state->sk = (void *)1; 152 return left ? vcc_walk(state, left) : (void *)1; 153 } 154 155 static void vcc_seq_stop(struct seq_file *seq, void *v) 156 __releases(vcc_sklist_lock) 157 { 158 read_unlock(&vcc_sklist_lock); 159 } 160 161 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 162 { 163 struct vcc_state *state = seq->private; 164 165 v = vcc_walk(state, 1); 166 *pos += !!PTR_ERR(v); 167 return v; 168 } 169 170 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) 171 { 172 static const char *class_name[] = { "off","UBR","CBR","VBR","ABR" }; 173 static const char *aal_name[] = { 174 "---", "1", "2", "3/4", /* 0- 3 */ 175 "???", "5", "???", "???", /* 4- 7 */ 176 "???", "???", "???", "???", /* 8-11 */ 177 "???", "0", "???", "???"}; /* 12-15 */ 178 179 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", 180 vcc->dev->number,vcc->vpi,vcc->vci, 181 vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : 182 aal_name[vcc->qos.aal],vcc->qos.rxtp.min_pcr, 183 class_name[vcc->qos.rxtp.traffic_class],vcc->qos.txtp.min_pcr, 184 class_name[vcc->qos.txtp.traffic_class]); 185 if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { 186 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 187 struct net_device *dev; 188 189 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; 190 seq_printf(seq, "CLIP, Itf:%s, Encap:", 191 dev ? dev->name : "none?"); 192 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); 193 } 194 seq_putc(seq, '\n'); 195 } 196 197 static const char *vcc_state(struct atm_vcc *vcc) 198 { 199 static const char *map[] = { ATM_VS2TXT_MAP }; 200 201 return map[ATM_VF2VS(vcc->flags)]; 202 } 203 204 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) 205 { 206 struct sock *sk = sk_atm(vcc); 207 208 seq_printf(seq, "%p ", vcc); 209 if (!vcc->dev) 210 seq_printf(seq, "Unassigned "); 211 else 212 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, 213 vcc->vci); 214 switch (sk->sk_family) { 215 case AF_ATMPVC: 216 seq_printf(seq, "PVC"); 217 break; 218 case AF_ATMSVC: 219 seq_printf(seq, "SVC"); 220 break; 221 default: 222 seq_printf(seq, "%3d", sk->sk_family); 223 } 224 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err, 225 atomic_read(&sk->sk_wmem_alloc), sk->sk_sndbuf, 226 atomic_read(&sk->sk_rmem_alloc), sk->sk_rcvbuf, 227 atomic_read(&sk->sk_refcnt)); 228 } 229 230 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) 231 { 232 if (!vcc->dev) 233 seq_printf(seq, sizeof(void *) == 4 ? 234 "N/A@%p%10s" : "N/A@%p%2s", vcc, ""); 235 else 236 seq_printf(seq, "%3d %3d %5d ", 237 vcc->dev->number, vcc->vpi, vcc->vci); 238 seq_printf(seq, "%-10s ", vcc_state(vcc)); 239 seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, 240 *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); 241 if (*vcc->remote.sas_addr.prv) { 242 int i; 243 244 for (i = 0; i < ATM_ESA_LEN; i++) 245 seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); 246 } 247 seq_putc(seq, '\n'); 248 } 249 250 static int atm_dev_seq_show(struct seq_file *seq, void *v) 251 { 252 static char atm_dev_banner[] = 253 "Itf Type ESI/\"MAC\"addr " 254 "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; 255 256 if (v == (void *)1) 257 seq_puts(seq, atm_dev_banner); 258 else { 259 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); 260 261 atm_dev_info(seq, dev); 262 } 263 return 0; 264 } 265 266 static const struct seq_operations atm_dev_seq_ops = { 267 .start = atm_dev_seq_start, 268 .next = atm_dev_seq_next, 269 .stop = atm_dev_seq_stop, 270 .show = atm_dev_seq_show, 271 }; 272 273 static int atm_dev_seq_open(struct inode *inode, struct file *file) 274 { 275 return seq_open(file, &atm_dev_seq_ops); 276 } 277 278 static const struct file_operations devices_seq_fops = { 279 .open = atm_dev_seq_open, 280 .read = seq_read, 281 .llseek = seq_lseek, 282 .release = seq_release, 283 }; 284 285 static int pvc_seq_show(struct seq_file *seq, void *v) 286 { 287 static char atm_pvc_banner[] = 288 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; 289 290 if (v == (void *)1) 291 seq_puts(seq, atm_pvc_banner); 292 else { 293 struct vcc_state *state = seq->private; 294 struct atm_vcc *vcc = atm_sk(state->sk); 295 296 pvc_info(seq, vcc); 297 } 298 return 0; 299 } 300 301 static const struct seq_operations pvc_seq_ops = { 302 .start = vcc_seq_start, 303 .next = vcc_seq_next, 304 .stop = vcc_seq_stop, 305 .show = pvc_seq_show, 306 }; 307 308 static int pvc_seq_open(struct inode *inode, struct file *file) 309 { 310 return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops); 311 } 312 313 static const struct file_operations pvc_seq_fops = { 314 .open = pvc_seq_open, 315 .read = seq_read, 316 .llseek = seq_lseek, 317 .release = vcc_seq_release, 318 }; 319 320 static int vcc_seq_show(struct seq_file *seq, void *v) 321 { 322 if (v == (void *)1) { 323 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", 324 "Address ", "Itf VPI VCI Fam Flags Reply " 325 "Send buffer Recv buffer [refcnt]\n"); 326 } else { 327 struct vcc_state *state = seq->private; 328 struct atm_vcc *vcc = atm_sk(state->sk); 329 330 vcc_info(seq, vcc); 331 } 332 return 0; 333 } 334 335 static const struct seq_operations vcc_seq_ops = { 336 .start = vcc_seq_start, 337 .next = vcc_seq_next, 338 .stop = vcc_seq_stop, 339 .show = vcc_seq_show, 340 }; 341 342 static int vcc_seq_open(struct inode *inode, struct file *file) 343 { 344 return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); 345 } 346 347 static const struct file_operations vcc_seq_fops = { 348 .open = vcc_seq_open, 349 .read = seq_read, 350 .llseek = seq_lseek, 351 .release = vcc_seq_release, 352 }; 353 354 static int svc_seq_show(struct seq_file *seq, void *v) 355 { 356 static char atm_svc_banner[] = 357 "Itf VPI VCI State Remote\n"; 358 359 if (v == (void *)1) 360 seq_puts(seq, atm_svc_banner); 361 else { 362 struct vcc_state *state = seq->private; 363 struct atm_vcc *vcc = atm_sk(state->sk); 364 365 svc_info(seq, vcc); 366 } 367 return 0; 368 } 369 370 static const struct seq_operations svc_seq_ops = { 371 .start = vcc_seq_start, 372 .next = vcc_seq_next, 373 .stop = vcc_seq_stop, 374 .show = svc_seq_show, 375 }; 376 377 static int svc_seq_open(struct inode *inode, struct file *file) 378 { 379 return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops); 380 } 381 382 static const struct file_operations svc_seq_fops = { 383 .open = svc_seq_open, 384 .read = seq_read, 385 .llseek = seq_lseek, 386 .release = vcc_seq_release, 387 }; 388 389 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, 390 size_t count, loff_t *pos) 391 { 392 struct atm_dev *dev; 393 unsigned long page; 394 int length; 395 396 if (count == 0) return 0; 397 page = get_zeroed_page(GFP_KERNEL); 398 if (!page) return -ENOMEM; 399 dev = PDE(file->f_path.dentry->d_inode)->data; 400 if (!dev->ops->proc_read) 401 length = -EINVAL; 402 else { 403 length = dev->ops->proc_read(dev,pos,(char *) page); 404 if (length > count) length = -EINVAL; 405 } 406 if (length >= 0) { 407 if (copy_to_user(buf,(char *) page,length)) length = -EFAULT; 408 (*pos)++; 409 } 410 free_page(page); 411 return length; 412 } 413 414 415 struct proc_dir_entry *atm_proc_root; 416 EXPORT_SYMBOL(atm_proc_root); 417 418 419 int atm_proc_dev_register(struct atm_dev *dev) 420 { 421 int digits,num; 422 int error; 423 424 /* No proc info */ 425 if (!dev->ops->proc_read) 426 return 0; 427 428 error = -ENOMEM; 429 digits = 0; 430 for (num = dev->number; num; num /= 10) digits++; 431 if (!digits) digits++; 432 433 dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL); 434 if (!dev->proc_name) 435 goto err_out; 436 sprintf(dev->proc_name,"%s:%d",dev->type, dev->number); 437 438 dev->proc_entry = proc_create(dev->proc_name, 0, atm_proc_root, 439 &proc_atm_dev_ops); 440 if (!dev->proc_entry) 441 goto err_free_name; 442 dev->proc_entry->data = dev; 443 dev->proc_entry->owner = THIS_MODULE; 444 return 0; 445 err_free_name: 446 kfree(dev->proc_name); 447 err_out: 448 return error; 449 } 450 451 452 void atm_proc_dev_deregister(struct atm_dev *dev) 453 { 454 if (!dev->ops->proc_read) 455 return; 456 457 remove_proc_entry(dev->proc_name, atm_proc_root); 458 kfree(dev->proc_name); 459 } 460 461 static struct atm_proc_entry { 462 char *name; 463 const struct file_operations *proc_fops; 464 struct proc_dir_entry *dirent; 465 } atm_proc_ents[] = { 466 { .name = "devices", .proc_fops = &devices_seq_fops }, 467 { .name = "pvc", .proc_fops = &pvc_seq_fops }, 468 { .name = "svc", .proc_fops = &svc_seq_fops }, 469 { .name = "vc", .proc_fops = &vcc_seq_fops }, 470 { .name = NULL, .proc_fops = NULL } 471 }; 472 473 static void atm_proc_dirs_remove(void) 474 { 475 static struct atm_proc_entry *e; 476 477 for (e = atm_proc_ents; e->name; e++) { 478 if (e->dirent) 479 remove_proc_entry(e->name, atm_proc_root); 480 } 481 proc_net_remove(&init_net, "atm"); 482 } 483 484 int __init atm_proc_init(void) 485 { 486 static struct atm_proc_entry *e; 487 int ret; 488 489 atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); 490 if (!atm_proc_root) 491 goto err_out; 492 for (e = atm_proc_ents; e->name; e++) { 493 struct proc_dir_entry *dirent; 494 495 dirent = proc_create(e->name, S_IRUGO, 496 atm_proc_root, e->proc_fops); 497 if (!dirent) 498 goto err_out_remove; 499 dirent->owner = THIS_MODULE; 500 e->dirent = dirent; 501 } 502 ret = 0; 503 out: 504 return ret; 505 506 err_out_remove: 507 atm_proc_dirs_remove(); 508 err_out: 509 ret = -ENOMEM; 510 goto out; 511 } 512 513 void atm_proc_exit(void) 514 { 515 atm_proc_dirs_remove(); 516 } 517