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/atmclip.h> 26 #include <asm/uaccess.h> 27 #include <asm/atomic.h> 28 #include <asm/param.h> /* for HZ */ 29 #include "resources.h" 30 #include "common.h" /* atm_proc_init prototype */ 31 #include "signaling.h" /* to get sigd - ugly too */ 32 33 static ssize_t proc_dev_atm_read(struct file *file,char __user *buf,size_t count, 34 loff_t *pos); 35 36 static const struct file_operations proc_atm_dev_ops = { 37 .owner = THIS_MODULE, 38 .read = proc_dev_atm_read, 39 }; 40 41 static void add_stats(struct seq_file *seq, const char *aal, 42 const struct k_atm_aal_stats *stats) 43 { 44 seq_printf(seq, "%s ( %d %d %d %d %d )", aal, 45 atomic_read(&stats->tx),atomic_read(&stats->tx_err), 46 atomic_read(&stats->rx),atomic_read(&stats->rx_err), 47 atomic_read(&stats->rx_drop)); 48 } 49 50 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) 51 { 52 int i; 53 54 seq_printf(seq, "%3d %-8s", dev->number, dev->type); 55 for (i = 0; i < ESI_LEN; i++) 56 seq_printf(seq, "%02x", dev->esi[i]); 57 seq_puts(seq, " "); 58 add_stats(seq, "0", &dev->stats.aal0); 59 seq_puts(seq, " "); 60 add_stats(seq, "5", &dev->stats.aal5); 61 seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt)); 62 seq_putc(seq, '\n'); 63 } 64 65 struct vcc_state { 66 int bucket; 67 struct sock *sk; 68 int family; 69 }; 70 71 static inline int compare_family(struct sock *sk, int family) 72 { 73 return !family || (sk->sk_family == family); 74 } 75 76 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) 77 { 78 struct sock *sk = *sock; 79 80 if (sk == (void *)1) { 81 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { 82 struct hlist_head *head = &vcc_hash[*bucket]; 83 84 sk = hlist_empty(head) ? NULL : __sk_head(head); 85 if (sk) 86 break; 87 } 88 l--; 89 } 90 try_again: 91 for (; sk; sk = sk_next(sk)) { 92 l -= compare_family(sk, family); 93 if (l < 0) 94 goto out; 95 } 96 if (!sk && ++*bucket < VCC_HTABLE_SIZE) { 97 sk = sk_head(&vcc_hash[*bucket]); 98 goto try_again; 99 } 100 sk = (void *)1; 101 out: 102 *sock = sk; 103 return (l < 0); 104 } 105 106 static inline void *vcc_walk(struct vcc_state *state, loff_t l) 107 { 108 return __vcc_walk(&state->sk, state->family, &state->bucket, l) ? 109 state : NULL; 110 } 111 112 static int __vcc_seq_open(struct inode *inode, struct file *file, 113 int family, struct seq_operations *ops) 114 { 115 struct vcc_state *state; 116 struct seq_file *seq; 117 int rc = -ENOMEM; 118 119 state = kmalloc(sizeof(*state), GFP_KERNEL); 120 if (!state) 121 goto out; 122 123 rc = seq_open(file, ops); 124 if (rc) 125 goto out_kfree; 126 127 state->family = family; 128 129 seq = file->private_data; 130 seq->private = state; 131 out: 132 return rc; 133 out_kfree: 134 kfree(state); 135 goto out; 136 } 137 138 static int vcc_seq_release(struct inode *inode, struct file *file) 139 { 140 return seq_release_private(inode, file); 141 } 142 143 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) 144 { 145 struct vcc_state *state = seq->private; 146 loff_t left = *pos; 147 148 read_lock(&vcc_sklist_lock); 149 state->sk = (void *)1; 150 return left ? vcc_walk(state, left) : (void *)1; 151 } 152 153 static void vcc_seq_stop(struct seq_file *seq, void *v) 154 { 155 read_unlock(&vcc_sklist_lock); 156 } 157 158 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 159 { 160 struct vcc_state *state = seq->private; 161 162 v = vcc_walk(state, 1); 163 *pos += !!PTR_ERR(v); 164 return v; 165 } 166 167 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) 168 { 169 static const char *class_name[] = { "off","UBR","CBR","VBR","ABR" }; 170 static const char *aal_name[] = { 171 "---", "1", "2", "3/4", /* 0- 3 */ 172 "???", "5", "???", "???", /* 4- 7 */ 173 "???", "???", "???", "???", /* 8-11 */ 174 "???", "0", "???", "???"}; /* 12-15 */ 175 176 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", 177 vcc->dev->number,vcc->vpi,vcc->vci, 178 vcc->qos.aal >= sizeof(aal_name)/sizeof(aal_name[0]) ? "err" : 179 aal_name[vcc->qos.aal],vcc->qos.rxtp.min_pcr, 180 class_name[vcc->qos.rxtp.traffic_class],vcc->qos.txtp.min_pcr, 181 class_name[vcc->qos.txtp.traffic_class]); 182 if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { 183 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 184 struct net_device *dev; 185 186 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; 187 seq_printf(seq, "CLIP, Itf:%s, Encap:", 188 dev ? dev->name : "none?"); 189 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); 190 } 191 seq_putc(seq, '\n'); 192 } 193 194 static const char *vcc_state(struct atm_vcc *vcc) 195 { 196 static const char *map[] = { ATM_VS2TXT_MAP }; 197 198 return map[ATM_VF2VS(vcc->flags)]; 199 } 200 201 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) 202 { 203 struct sock *sk = sk_atm(vcc); 204 205 seq_printf(seq, "%p ", vcc); 206 if (!vcc->dev) 207 seq_printf(seq, "Unassigned "); 208 else 209 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, 210 vcc->vci); 211 switch (sk->sk_family) { 212 case AF_ATMPVC: 213 seq_printf(seq, "PVC"); 214 break; 215 case AF_ATMSVC: 216 seq_printf(seq, "SVC"); 217 break; 218 default: 219 seq_printf(seq, "%3d", sk->sk_family); 220 } 221 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err, 222 atomic_read(&sk->sk_wmem_alloc), sk->sk_sndbuf, 223 atomic_read(&sk->sk_rmem_alloc), sk->sk_rcvbuf, 224 atomic_read(&sk->sk_refcnt)); 225 } 226 227 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) 228 { 229 if (!vcc->dev) 230 seq_printf(seq, sizeof(void *) == 4 ? 231 "N/A@%p%10s" : "N/A@%p%2s", vcc, ""); 232 else 233 seq_printf(seq, "%3d %3d %5d ", 234 vcc->dev->number, vcc->vpi, vcc->vci); 235 seq_printf(seq, "%-10s ", vcc_state(vcc)); 236 seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, 237 *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); 238 if (*vcc->remote.sas_addr.prv) { 239 int i; 240 241 for (i = 0; i < ATM_ESA_LEN; i++) 242 seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); 243 } 244 seq_putc(seq, '\n'); 245 } 246 247 static int atm_dev_seq_show(struct seq_file *seq, void *v) 248 { 249 static char atm_dev_banner[] = 250 "Itf Type ESI/\"MAC\"addr " 251 "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; 252 253 if (v == (void *)1) 254 seq_puts(seq, atm_dev_banner); 255 else { 256 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); 257 258 atm_dev_info(seq, dev); 259 } 260 return 0; 261 } 262 263 static struct seq_operations atm_dev_seq_ops = { 264 .start = atm_dev_seq_start, 265 .next = atm_dev_seq_next, 266 .stop = atm_dev_seq_stop, 267 .show = atm_dev_seq_show, 268 }; 269 270 static int atm_dev_seq_open(struct inode *inode, struct file *file) 271 { 272 return seq_open(file, &atm_dev_seq_ops); 273 } 274 275 static const struct file_operations devices_seq_fops = { 276 .open = atm_dev_seq_open, 277 .read = seq_read, 278 .llseek = seq_lseek, 279 .release = seq_release, 280 }; 281 282 static int pvc_seq_show(struct seq_file *seq, void *v) 283 { 284 static char atm_pvc_banner[] = 285 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; 286 287 if (v == (void *)1) 288 seq_puts(seq, atm_pvc_banner); 289 else { 290 struct vcc_state *state = seq->private; 291 struct atm_vcc *vcc = atm_sk(state->sk); 292 293 pvc_info(seq, vcc); 294 } 295 return 0; 296 } 297 298 static struct seq_operations pvc_seq_ops = { 299 .start = vcc_seq_start, 300 .next = vcc_seq_next, 301 .stop = vcc_seq_stop, 302 .show = pvc_seq_show, 303 }; 304 305 static int pvc_seq_open(struct inode *inode, struct file *file) 306 { 307 return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops); 308 } 309 310 static const struct file_operations pvc_seq_fops = { 311 .open = pvc_seq_open, 312 .read = seq_read, 313 .llseek = seq_lseek, 314 .release = vcc_seq_release, 315 }; 316 317 static int vcc_seq_show(struct seq_file *seq, void *v) 318 { 319 if (v == (void *)1) { 320 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", 321 "Address ", "Itf VPI VCI Fam Flags Reply " 322 "Send buffer Recv buffer [refcnt]\n"); 323 } else { 324 struct vcc_state *state = seq->private; 325 struct atm_vcc *vcc = atm_sk(state->sk); 326 327 vcc_info(seq, vcc); 328 } 329 return 0; 330 } 331 332 static struct seq_operations vcc_seq_ops = { 333 .start = vcc_seq_start, 334 .next = vcc_seq_next, 335 .stop = vcc_seq_stop, 336 .show = vcc_seq_show, 337 }; 338 339 static int vcc_seq_open(struct inode *inode, struct file *file) 340 { 341 return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); 342 } 343 344 static const struct file_operations vcc_seq_fops = { 345 .open = vcc_seq_open, 346 .read = seq_read, 347 .llseek = seq_lseek, 348 .release = vcc_seq_release, 349 }; 350 351 static int svc_seq_show(struct seq_file *seq, void *v) 352 { 353 static char atm_svc_banner[] = 354 "Itf VPI VCI State Remote\n"; 355 356 if (v == (void *)1) 357 seq_puts(seq, atm_svc_banner); 358 else { 359 struct vcc_state *state = seq->private; 360 struct atm_vcc *vcc = atm_sk(state->sk); 361 362 svc_info(seq, vcc); 363 } 364 return 0; 365 } 366 367 static struct seq_operations svc_seq_ops = { 368 .start = vcc_seq_start, 369 .next = vcc_seq_next, 370 .stop = vcc_seq_stop, 371 .show = svc_seq_show, 372 }; 373 374 static int svc_seq_open(struct inode *inode, struct file *file) 375 { 376 return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops); 377 } 378 379 static const struct file_operations svc_seq_fops = { 380 .open = svc_seq_open, 381 .read = seq_read, 382 .llseek = seq_lseek, 383 .release = vcc_seq_release, 384 }; 385 386 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, 387 size_t count, loff_t *pos) 388 { 389 struct atm_dev *dev; 390 unsigned long page; 391 int length; 392 393 if (count == 0) return 0; 394 page = get_zeroed_page(GFP_KERNEL); 395 if (!page) return -ENOMEM; 396 dev = PDE(file->f_path.dentry->d_inode)->data; 397 if (!dev->ops->proc_read) 398 length = -EINVAL; 399 else { 400 length = dev->ops->proc_read(dev,pos,(char *) page); 401 if (length > count) length = -EINVAL; 402 } 403 if (length >= 0) { 404 if (copy_to_user(buf,(char *) page,length)) length = -EFAULT; 405 (*pos)++; 406 } 407 free_page(page); 408 return length; 409 } 410 411 412 struct proc_dir_entry *atm_proc_root; 413 EXPORT_SYMBOL(atm_proc_root); 414 415 416 int atm_proc_dev_register(struct atm_dev *dev) 417 { 418 int digits,num; 419 int error; 420 421 /* No proc info */ 422 if (!dev->ops->proc_read) 423 return 0; 424 425 error = -ENOMEM; 426 digits = 0; 427 for (num = dev->number; num; num /= 10) digits++; 428 if (!digits) digits++; 429 430 dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL); 431 if (!dev->proc_name) 432 goto err_out; 433 sprintf(dev->proc_name,"%s:%d",dev->type, dev->number); 434 435 dev->proc_entry = create_proc_entry(dev->proc_name, 0, atm_proc_root); 436 if (!dev->proc_entry) 437 goto err_free_name; 438 dev->proc_entry->data = dev; 439 dev->proc_entry->proc_fops = &proc_atm_dev_ops; 440 dev->proc_entry->owner = THIS_MODULE; 441 return 0; 442 err_free_name: 443 kfree(dev->proc_name); 444 err_out: 445 return error; 446 } 447 448 449 void atm_proc_dev_deregister(struct atm_dev *dev) 450 { 451 if (!dev->ops->proc_read) 452 return; 453 454 remove_proc_entry(dev->proc_name, atm_proc_root); 455 kfree(dev->proc_name); 456 } 457 458 static struct atm_proc_entry { 459 char *name; 460 const struct file_operations *proc_fops; 461 struct proc_dir_entry *dirent; 462 } atm_proc_ents[] = { 463 { .name = "devices", .proc_fops = &devices_seq_fops }, 464 { .name = "pvc", .proc_fops = &pvc_seq_fops }, 465 { .name = "svc", .proc_fops = &svc_seq_fops }, 466 { .name = "vc", .proc_fops = &vcc_seq_fops }, 467 { .name = NULL, .proc_fops = NULL } 468 }; 469 470 static void atm_proc_dirs_remove(void) 471 { 472 static struct atm_proc_entry *e; 473 474 for (e = atm_proc_ents; e->name; e++) { 475 if (e->dirent) 476 remove_proc_entry(e->name, atm_proc_root); 477 } 478 remove_proc_entry("net/atm", NULL); 479 } 480 481 int __init atm_proc_init(void) 482 { 483 static struct atm_proc_entry *e; 484 int ret; 485 486 atm_proc_root = proc_mkdir("net/atm",NULL); 487 if (!atm_proc_root) 488 goto err_out; 489 for (e = atm_proc_ents; e->name; e++) { 490 struct proc_dir_entry *dirent; 491 492 dirent = create_proc_entry(e->name, S_IRUGO, atm_proc_root); 493 if (!dirent) 494 goto err_out_remove; 495 dirent->proc_fops = e->proc_fops; 496 dirent->owner = THIS_MODULE; 497 e->dirent = dirent; 498 } 499 ret = 0; 500 out: 501 return ret; 502 503 err_out_remove: 504 atm_proc_dirs_remove(); 505 err_out: 506 ret = -ENOMEM; 507 goto out; 508 } 509 510 void atm_proc_exit(void) 511 { 512 atm_proc_dirs_remove(); 513 } 514