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/init.h> /* for __init */ 25 #include <linux/slab.h> 26 #include <net/net_namespace.h> 27 #include <linux/uaccess.h> 28 #include <linux/param.h> /* for HZ */ 29 #include <linux/atomic.h> 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, 35 size_t count, loff_t *pos); 36 37 static const struct proc_ops atm_dev_proc_ops = { 38 .proc_read = proc_dev_atm_read, 39 .proc_lseek = noop_llseek, 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]", refcount_read(&dev->refcnt)); 63 seq_putc(seq, '\n'); 64 } 65 66 struct vcc_state { 67 int bucket; 68 struct sock *sk; 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 == SEQ_START_TOKEN) { 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 = SEQ_START_TOKEN; 101 out: 102 *sock = sk; 103 return (l < 0); 104 } 105 106 static inline void *vcc_walk(struct seq_file *seq, loff_t l) 107 { 108 struct vcc_state *state = seq->private; 109 int family = (uintptr_t)(pde_data(file_inode(seq->file))); 110 111 return __vcc_walk(&state->sk, family, &state->bucket, l) ? 112 state : NULL; 113 } 114 115 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) 116 __acquires(vcc_sklist_lock) 117 { 118 struct vcc_state *state = seq->private; 119 loff_t left = *pos; 120 121 read_lock(&vcc_sklist_lock); 122 state->sk = SEQ_START_TOKEN; 123 return left ? vcc_walk(seq, left) : SEQ_START_TOKEN; 124 } 125 126 static void vcc_seq_stop(struct seq_file *seq, void *v) 127 __releases(vcc_sklist_lock) 128 { 129 read_unlock(&vcc_sklist_lock); 130 } 131 132 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 133 { 134 v = vcc_walk(seq, 1); 135 (*pos)++; 136 return v; 137 } 138 139 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) 140 { 141 static const char *const class_name[] = { 142 "off", "UBR", "CBR", "VBR", "ABR"}; 143 static const char *const aal_name[] = { 144 "---", "1", "2", "3/4", /* 0- 3 */ 145 "???", "5", "???", "???", /* 4- 7 */ 146 "???", "???", "???", "???", /* 8-11 */ 147 "???", "0", "???", "???"}; /* 12-15 */ 148 149 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", 150 vcc->dev->number, vcc->vpi, vcc->vci, 151 vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : 152 aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, 153 class_name[vcc->qos.rxtp.traffic_class], 154 vcc->qos.txtp.min_pcr, 155 class_name[vcc->qos.txtp.traffic_class]); 156 seq_putc(seq, '\n'); 157 } 158 159 static const char *vcc_state(struct atm_vcc *vcc) 160 { 161 static const char *const map[] = { ATM_VS2TXT_MAP }; 162 163 return map[ATM_VF2VS(vcc->flags)]; 164 } 165 166 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) 167 { 168 struct sock *sk = sk_atm(vcc); 169 170 seq_printf(seq, "%pK ", vcc); 171 if (!vcc->dev) 172 seq_printf(seq, "Unassigned "); 173 else 174 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, 175 vcc->vci); 176 switch (sk->sk_family) { 177 case AF_ATMPVC: 178 seq_printf(seq, "PVC"); 179 break; 180 case AF_ATMSVC: 181 seq_printf(seq, "SVC"); 182 break; 183 default: 184 seq_printf(seq, "%3d", sk->sk_family); 185 } 186 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", 187 vcc->flags, sk->sk_err, 188 sk_wmem_alloc_get(sk), sk->sk_sndbuf, 189 sk_rmem_alloc_get(sk), sk->sk_rcvbuf, 190 refcount_read(&sk->sk_refcnt)); 191 } 192 193 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) 194 { 195 if (!vcc->dev) 196 seq_printf(seq, sizeof(void *) == 4 ? 197 "N/A@%pK%10s" : "N/A@%pK%2s", vcc, ""); 198 else 199 seq_printf(seq, "%3d %3d %5d ", 200 vcc->dev->number, vcc->vpi, vcc->vci); 201 seq_printf(seq, "%-10s ", vcc_state(vcc)); 202 seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, 203 *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); 204 if (*vcc->remote.sas_addr.prv) { 205 int i; 206 207 for (i = 0; i < ATM_ESA_LEN; i++) 208 seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); 209 } 210 seq_putc(seq, '\n'); 211 } 212 213 static int atm_dev_seq_show(struct seq_file *seq, void *v) 214 { 215 static char atm_dev_banner[] = 216 "Itf Type ESI/\"MAC\"addr " 217 "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; 218 219 if (v == &atm_devs) 220 seq_puts(seq, atm_dev_banner); 221 else { 222 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); 223 224 atm_dev_info(seq, dev); 225 } 226 return 0; 227 } 228 229 static const struct seq_operations atm_dev_seq_ops = { 230 .start = atm_dev_seq_start, 231 .next = atm_dev_seq_next, 232 .stop = atm_dev_seq_stop, 233 .show = atm_dev_seq_show, 234 }; 235 236 static int pvc_seq_show(struct seq_file *seq, void *v) 237 { 238 static char atm_pvc_banner[] = 239 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; 240 241 if (v == SEQ_START_TOKEN) 242 seq_puts(seq, atm_pvc_banner); 243 else { 244 struct vcc_state *state = seq->private; 245 struct atm_vcc *vcc = atm_sk(state->sk); 246 247 pvc_info(seq, vcc); 248 } 249 return 0; 250 } 251 252 static const struct seq_operations pvc_seq_ops = { 253 .start = vcc_seq_start, 254 .next = vcc_seq_next, 255 .stop = vcc_seq_stop, 256 .show = pvc_seq_show, 257 }; 258 259 static int vcc_seq_show(struct seq_file *seq, void *v) 260 { 261 if (v == SEQ_START_TOKEN) { 262 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", 263 "Address ", "Itf VPI VCI Fam Flags Reply " 264 "Send buffer Recv buffer [refcnt]\n"); 265 } else { 266 struct vcc_state *state = seq->private; 267 struct atm_vcc *vcc = atm_sk(state->sk); 268 269 vcc_info(seq, vcc); 270 } 271 return 0; 272 } 273 274 static const struct seq_operations vcc_seq_ops = { 275 .start = vcc_seq_start, 276 .next = vcc_seq_next, 277 .stop = vcc_seq_stop, 278 .show = vcc_seq_show, 279 }; 280 281 static int svc_seq_show(struct seq_file *seq, void *v) 282 { 283 static const char atm_svc_banner[] = 284 "Itf VPI VCI State Remote\n"; 285 286 if (v == SEQ_START_TOKEN) 287 seq_puts(seq, atm_svc_banner); 288 else { 289 struct vcc_state *state = seq->private; 290 struct atm_vcc *vcc = atm_sk(state->sk); 291 292 svc_info(seq, vcc); 293 } 294 return 0; 295 } 296 297 static const struct seq_operations svc_seq_ops = { 298 .start = vcc_seq_start, 299 .next = vcc_seq_next, 300 .stop = vcc_seq_stop, 301 .show = svc_seq_show, 302 }; 303 304 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, 305 size_t count, loff_t *pos) 306 { 307 struct atm_dev *dev; 308 unsigned long page; 309 int length; 310 311 if (count == 0) 312 return 0; 313 page = get_zeroed_page(GFP_KERNEL); 314 if (!page) 315 return -ENOMEM; 316 dev = pde_data(file_inode(file)); 317 if (!dev->ops->proc_read) 318 length = -EINVAL; 319 else { 320 length = dev->ops->proc_read(dev, pos, (char *)page); 321 if (length > count) 322 length = -EINVAL; 323 } 324 if (length >= 0) { 325 if (copy_to_user(buf, (char *)page, length)) 326 length = -EFAULT; 327 (*pos)++; 328 } 329 free_page(page); 330 return length; 331 } 332 333 struct proc_dir_entry *atm_proc_root; 334 EXPORT_SYMBOL(atm_proc_root); 335 336 337 int atm_proc_dev_register(struct atm_dev *dev) 338 { 339 int error; 340 341 /* No proc info */ 342 if (!dev->ops->proc_read) 343 return 0; 344 345 error = -ENOMEM; 346 dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); 347 if (!dev->proc_name) 348 goto err_out; 349 350 dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, 351 &atm_dev_proc_ops, dev); 352 if (!dev->proc_entry) 353 goto err_free_name; 354 return 0; 355 356 err_free_name: 357 kfree(dev->proc_name); 358 err_out: 359 return error; 360 } 361 362 void atm_proc_dev_deregister(struct atm_dev *dev) 363 { 364 if (!dev->ops->proc_read) 365 return; 366 367 remove_proc_entry(dev->proc_name, atm_proc_root); 368 kfree(dev->proc_name); 369 } 370 371 int __init atm_proc_init(void) 372 { 373 atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); 374 if (!atm_proc_root) 375 return -ENOMEM; 376 proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops); 377 proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops, 378 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC); 379 proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops, 380 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC); 381 proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops, 382 sizeof(struct vcc_state), NULL); 383 return 0; 384 } 385 386 void atm_proc_exit(void) 387 { 388 remove_proc_subtree("atm", init_net.proc_net); 389 } 390