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 proc_ops atm_dev_proc_ops = { 40 .proc_read = proc_dev_atm_read, 41 .proc_lseek = 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 }; 72 73 static inline int compare_family(struct sock *sk, int family) 74 { 75 return !family || (sk->sk_family == family); 76 } 77 78 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) 79 { 80 struct sock *sk = *sock; 81 82 if (sk == SEQ_START_TOKEN) { 83 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { 84 struct hlist_head *head = &vcc_hash[*bucket]; 85 86 sk = hlist_empty(head) ? NULL : __sk_head(head); 87 if (sk) 88 break; 89 } 90 l--; 91 } 92 try_again: 93 for (; sk; sk = sk_next(sk)) { 94 l -= compare_family(sk, family); 95 if (l < 0) 96 goto out; 97 } 98 if (!sk && ++*bucket < VCC_HTABLE_SIZE) { 99 sk = sk_head(&vcc_hash[*bucket]); 100 goto try_again; 101 } 102 sk = SEQ_START_TOKEN; 103 out: 104 *sock = sk; 105 return (l < 0); 106 } 107 108 static inline void *vcc_walk(struct seq_file *seq, loff_t l) 109 { 110 struct vcc_state *state = seq->private; 111 int family = (uintptr_t)(PDE_DATA(file_inode(seq->file))); 112 113 return __vcc_walk(&state->sk, family, &state->bucket, l) ? 114 state : NULL; 115 } 116 117 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) 118 __acquires(vcc_sklist_lock) 119 { 120 struct vcc_state *state = seq->private; 121 loff_t left = *pos; 122 123 read_lock(&vcc_sklist_lock); 124 state->sk = SEQ_START_TOKEN; 125 return left ? vcc_walk(seq, left) : SEQ_START_TOKEN; 126 } 127 128 static void vcc_seq_stop(struct seq_file *seq, void *v) 129 __releases(vcc_sklist_lock) 130 { 131 read_unlock(&vcc_sklist_lock); 132 } 133 134 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 135 { 136 v = vcc_walk(seq, 1); 137 (*pos)++; 138 return v; 139 } 140 141 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) 142 { 143 static const char *const class_name[] = { 144 "off", "UBR", "CBR", "VBR", "ABR"}; 145 static const char *const aal_name[] = { 146 "---", "1", "2", "3/4", /* 0- 3 */ 147 "???", "5", "???", "???", /* 4- 7 */ 148 "???", "???", "???", "???", /* 8-11 */ 149 "???", "0", "???", "???"}; /* 12-15 */ 150 151 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", 152 vcc->dev->number, vcc->vpi, vcc->vci, 153 vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : 154 aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, 155 class_name[vcc->qos.rxtp.traffic_class], 156 vcc->qos.txtp.min_pcr, 157 class_name[vcc->qos.txtp.traffic_class]); 158 if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { 159 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 160 struct net_device *dev; 161 162 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; 163 seq_printf(seq, "CLIP, Itf:%s, Encap:", 164 dev ? dev->name : "none?"); 165 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); 166 } 167 seq_putc(seq, '\n'); 168 } 169 170 static const char *vcc_state(struct atm_vcc *vcc) 171 { 172 static const char *const map[] = { ATM_VS2TXT_MAP }; 173 174 return map[ATM_VF2VS(vcc->flags)]; 175 } 176 177 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) 178 { 179 struct sock *sk = sk_atm(vcc); 180 181 seq_printf(seq, "%pK ", vcc); 182 if (!vcc->dev) 183 seq_printf(seq, "Unassigned "); 184 else 185 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, 186 vcc->vci); 187 switch (sk->sk_family) { 188 case AF_ATMPVC: 189 seq_printf(seq, "PVC"); 190 break; 191 case AF_ATMSVC: 192 seq_printf(seq, "SVC"); 193 break; 194 default: 195 seq_printf(seq, "%3d", sk->sk_family); 196 } 197 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", 198 vcc->flags, sk->sk_err, 199 sk_wmem_alloc_get(sk), sk->sk_sndbuf, 200 sk_rmem_alloc_get(sk), sk->sk_rcvbuf, 201 refcount_read(&sk->sk_refcnt)); 202 } 203 204 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) 205 { 206 if (!vcc->dev) 207 seq_printf(seq, sizeof(void *) == 4 ? 208 "N/A@%pK%10s" : "N/A@%pK%2s", vcc, ""); 209 else 210 seq_printf(seq, "%3d %3d %5d ", 211 vcc->dev->number, vcc->vpi, vcc->vci); 212 seq_printf(seq, "%-10s ", vcc_state(vcc)); 213 seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, 214 *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); 215 if (*vcc->remote.sas_addr.prv) { 216 int i; 217 218 for (i = 0; i < ATM_ESA_LEN; i++) 219 seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); 220 } 221 seq_putc(seq, '\n'); 222 } 223 224 static int atm_dev_seq_show(struct seq_file *seq, void *v) 225 { 226 static char atm_dev_banner[] = 227 "Itf Type ESI/\"MAC\"addr " 228 "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; 229 230 if (v == &atm_devs) 231 seq_puts(seq, atm_dev_banner); 232 else { 233 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); 234 235 atm_dev_info(seq, dev); 236 } 237 return 0; 238 } 239 240 static const struct seq_operations atm_dev_seq_ops = { 241 .start = atm_dev_seq_start, 242 .next = atm_dev_seq_next, 243 .stop = atm_dev_seq_stop, 244 .show = atm_dev_seq_show, 245 }; 246 247 static int pvc_seq_show(struct seq_file *seq, void *v) 248 { 249 static char atm_pvc_banner[] = 250 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; 251 252 if (v == SEQ_START_TOKEN) 253 seq_puts(seq, atm_pvc_banner); 254 else { 255 struct vcc_state *state = seq->private; 256 struct atm_vcc *vcc = atm_sk(state->sk); 257 258 pvc_info(seq, vcc); 259 } 260 return 0; 261 } 262 263 static const struct seq_operations pvc_seq_ops = { 264 .start = vcc_seq_start, 265 .next = vcc_seq_next, 266 .stop = vcc_seq_stop, 267 .show = pvc_seq_show, 268 }; 269 270 static int vcc_seq_show(struct seq_file *seq, void *v) 271 { 272 if (v == SEQ_START_TOKEN) { 273 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", 274 "Address ", "Itf VPI VCI Fam Flags Reply " 275 "Send buffer Recv buffer [refcnt]\n"); 276 } else { 277 struct vcc_state *state = seq->private; 278 struct atm_vcc *vcc = atm_sk(state->sk); 279 280 vcc_info(seq, vcc); 281 } 282 return 0; 283 } 284 285 static const struct seq_operations vcc_seq_ops = { 286 .start = vcc_seq_start, 287 .next = vcc_seq_next, 288 .stop = vcc_seq_stop, 289 .show = vcc_seq_show, 290 }; 291 292 static int svc_seq_show(struct seq_file *seq, void *v) 293 { 294 static const char atm_svc_banner[] = 295 "Itf VPI VCI State Remote\n"; 296 297 if (v == SEQ_START_TOKEN) 298 seq_puts(seq, atm_svc_banner); 299 else { 300 struct vcc_state *state = seq->private; 301 struct atm_vcc *vcc = atm_sk(state->sk); 302 303 svc_info(seq, vcc); 304 } 305 return 0; 306 } 307 308 static const struct seq_operations svc_seq_ops = { 309 .start = vcc_seq_start, 310 .next = vcc_seq_next, 311 .stop = vcc_seq_stop, 312 .show = svc_seq_show, 313 }; 314 315 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, 316 size_t count, loff_t *pos) 317 { 318 struct atm_dev *dev; 319 unsigned long page; 320 int length; 321 322 if (count == 0) 323 return 0; 324 page = get_zeroed_page(GFP_KERNEL); 325 if (!page) 326 return -ENOMEM; 327 dev = PDE_DATA(file_inode(file)); 328 if (!dev->ops->proc_read) 329 length = -EINVAL; 330 else { 331 length = dev->ops->proc_read(dev, pos, (char *)page); 332 if (length > count) 333 length = -EINVAL; 334 } 335 if (length >= 0) { 336 if (copy_to_user(buf, (char *)page, length)) 337 length = -EFAULT; 338 (*pos)++; 339 } 340 free_page(page); 341 return length; 342 } 343 344 struct proc_dir_entry *atm_proc_root; 345 EXPORT_SYMBOL(atm_proc_root); 346 347 348 int atm_proc_dev_register(struct atm_dev *dev) 349 { 350 int error; 351 352 /* No proc info */ 353 if (!dev->ops->proc_read) 354 return 0; 355 356 error = -ENOMEM; 357 dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); 358 if (!dev->proc_name) 359 goto err_out; 360 361 dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, 362 &atm_dev_proc_ops, dev); 363 if (!dev->proc_entry) 364 goto err_free_name; 365 return 0; 366 367 err_free_name: 368 kfree(dev->proc_name); 369 err_out: 370 return error; 371 } 372 373 void atm_proc_dev_deregister(struct atm_dev *dev) 374 { 375 if (!dev->ops->proc_read) 376 return; 377 378 remove_proc_entry(dev->proc_name, atm_proc_root); 379 kfree(dev->proc_name); 380 } 381 382 int __init atm_proc_init(void) 383 { 384 atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); 385 if (!atm_proc_root) 386 return -ENOMEM; 387 proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops); 388 proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops, 389 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC); 390 proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops, 391 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC); 392 proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops, 393 sizeof(struct vcc_state), NULL); 394 return 0; 395 } 396 397 void atm_proc_exit(void) 398 { 399 remove_proc_subtree("atm", init_net.proc_net); 400 } 401