net/atm/proc.c

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