1 // SPDX-License-Identifier: GPL-2.0-only 2 /* net/atm/clip.c - RFC1577 Classical IP over ATM */ 3 4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 7 8 #include <linux/string.h> 9 #include <linux/errno.h> 10 #include <linux/kernel.h> /* for UINT_MAX */ 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/netdevice.h> 14 #include <linux/skbuff.h> 15 #include <linux/wait.h> 16 #include <linux/timer.h> 17 #include <linux/if_arp.h> /* for some manifest constants */ 18 #include <linux/notifier.h> 19 #include <linux/atm.h> 20 #include <linux/atmdev.h> 21 #include <linux/atmclip.h> 22 #include <linux/atmarp.h> 23 #include <linux/capability.h> 24 #include <linux/ip.h> /* for net/route.h */ 25 #include <linux/in.h> /* for struct sockaddr_in */ 26 #include <linux/if.h> /* for IFF_UP */ 27 #include <linux/inetdevice.h> 28 #include <linux/bitops.h> 29 #include <linux/poison.h> 30 #include <linux/proc_fs.h> 31 #include <linux/seq_file.h> 32 #include <linux/rcupdate.h> 33 #include <linux/jhash.h> 34 #include <linux/slab.h> 35 #include <net/route.h> /* for struct rtable and routing */ 36 #include <net/icmp.h> /* icmp_send */ 37 #include <net/arp.h> 38 #include <linux/param.h> /* for HZ */ 39 #include <linux/uaccess.h> 40 #include <asm/byteorder.h> /* for htons etc. */ 41 #include <linux/atomic.h> 42 43 #include "common.h" 44 #include "resources.h" 45 #include <net/atmclip.h> 46 47 static struct net_device *clip_devs; 48 static struct atm_vcc __rcu *atmarpd; 49 static DEFINE_MUTEX(atmarpd_lock); 50 static struct timer_list idle_timer; 51 static const struct neigh_ops clip_neigh_ops; 52 53 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) 54 { 55 struct sock *sk; 56 struct atmarp_ctrl *ctrl; 57 struct atm_vcc *vcc; 58 struct sk_buff *skb; 59 int err = 0; 60 61 pr_debug("(%d)\n", type); 62 63 rcu_read_lock(); 64 vcc = rcu_dereference(atmarpd); 65 if (!vcc) { 66 err = -EUNATCH; 67 goto unlock; 68 } 69 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC); 70 if (!skb) { 71 err = -ENOMEM; 72 goto unlock; 73 } 74 ctrl = skb_put(skb, sizeof(struct atmarp_ctrl)); 75 ctrl->type = type; 76 ctrl->itf_num = itf; 77 ctrl->ip = ip; 78 atm_force_charge(vcc, skb->truesize); 79 80 sk = sk_atm(vcc); 81 skb_queue_tail(&sk->sk_receive_queue, skb); 82 sk->sk_data_ready(sk); 83 unlock: 84 rcu_read_unlock(); 85 return err; 86 } 87 88 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) 89 { 90 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh); 91 clip_vcc->entry = entry; 92 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 93 clip_vcc->next = entry->vccs; 94 entry->vccs = clip_vcc; 95 entry->neigh->used = jiffies; 96 } 97 98 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 99 { 100 struct atmarp_entry *entry = clip_vcc->entry; 101 struct clip_vcc **walk; 102 103 if (!entry) { 104 pr_err("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); 105 return; 106 } 107 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ 108 entry->neigh->used = jiffies; 109 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 110 if (*walk == clip_vcc) { 111 int error; 112 113 *walk = clip_vcc->next; /* atomic */ 114 clip_vcc->entry = NULL; 115 if (clip_vcc->xoff) 116 netif_wake_queue(entry->neigh->dev); 117 if (entry->vccs) 118 goto out; 119 entry->expires = jiffies - 1; 120 /* force resolution or expiration */ 121 error = neigh_update(entry->neigh, NULL, NUD_NONE, 122 NEIGH_UPDATE_F_ADMIN, 0); 123 if (error) 124 pr_err("neigh_update failed with %d\n", error); 125 goto out; 126 } 127 pr_err("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc); 128 out: 129 netif_tx_unlock_bh(entry->neigh->dev); 130 } 131 132 /* The neighbour entry n->lock is held. */ 133 static int neigh_check_cb(struct neighbour *n) 134 { 135 struct atmarp_entry *entry = neighbour_priv(n); 136 struct clip_vcc *cv; 137 138 if (n->ops != &clip_neigh_ops) 139 return 0; 140 for (cv = entry->vccs; cv; cv = cv->next) { 141 unsigned long exp = cv->last_use + cv->idle_timeout; 142 143 if (cv->idle_timeout && time_after(jiffies, exp)) { 144 pr_debug("releasing vcc %p->%p of entry %p\n", 145 cv, cv->vcc, entry); 146 vcc_release_async(cv->vcc, -ETIMEDOUT); 147 } 148 } 149 150 if (entry->vccs || time_before(jiffies, entry->expires)) 151 return 0; 152 153 if (refcount_read(&n->refcnt) > 1) { 154 struct sk_buff *skb; 155 156 pr_debug("destruction postponed with ref %d\n", 157 refcount_read(&n->refcnt)); 158 159 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 160 dev_kfree_skb(skb); 161 162 return 0; 163 } 164 165 pr_debug("expired neigh %p\n", n); 166 return 1; 167 } 168 169 static void idle_timer_check(struct timer_list *unused) 170 { 171 write_lock(&arp_tbl.lock); 172 __neigh_for_each_release(&arp_tbl, neigh_check_cb); 173 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 174 write_unlock(&arp_tbl.lock); 175 } 176 177 static int clip_arp_rcv(struct sk_buff *skb) 178 { 179 struct atm_vcc *vcc; 180 181 pr_debug("\n"); 182 vcc = ATM_SKB(skb)->vcc; 183 if (!vcc || !atm_charge(vcc, skb->truesize)) { 184 dev_kfree_skb_any(skb); 185 return 0; 186 } 187 pr_debug("pushing to %p\n", vcc); 188 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push); 189 CLIP_VCC(vcc)->old_push(vcc, skb); 190 return 0; 191 } 192 193 static const unsigned char llc_oui[] = { 194 0xaa, /* DSAP: non-ISO */ 195 0xaa, /* SSAP: non-ISO */ 196 0x03, /* Ctrl: Unnumbered Information Command PDU */ 197 0x00, /* OUI: EtherType */ 198 0x00, 199 0x00 200 }; 201 202 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) 203 { 204 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 205 206 pr_debug("\n"); 207 208 if (!skb) { 209 pr_debug("removing VCC %p\n", clip_vcc); 210 if (clip_vcc->entry) 211 unlink_clip_vcc(clip_vcc); 212 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ 213 kfree(clip_vcc); 214 return; 215 } 216 atm_return(vcc, skb->truesize); 217 if (!clip_devs) { 218 kfree_skb(skb); 219 return; 220 } 221 222 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; 223 /* clip_vcc->entry == NULL if we don't have an IP address yet */ 224 if (!skb->dev) { 225 dev_kfree_skb_any(skb); 226 return; 227 } 228 ATM_SKB(skb)->vcc = vcc; 229 skb_reset_mac_header(skb); 230 if (!clip_vcc->encap || 231 skb->len < RFC1483LLC_LEN || 232 memcmp(skb->data, llc_oui, sizeof(llc_oui))) 233 skb->protocol = htons(ETH_P_IP); 234 else { 235 skb->protocol = ((__be16 *)skb->data)[3]; 236 skb_pull(skb, RFC1483LLC_LEN); 237 if (skb->protocol == htons(ETH_P_ARP)) { 238 skb->dev->stats.rx_packets++; 239 skb->dev->stats.rx_bytes += skb->len; 240 clip_arp_rcv(skb); 241 return; 242 } 243 } 244 clip_vcc->last_use = jiffies; 245 skb->dev->stats.rx_packets++; 246 skb->dev->stats.rx_bytes += skb->len; 247 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 248 netif_rx(skb); 249 } 250 251 /* 252 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that 253 * clip_pop is atomic with respect to the critical section in clip_start_xmit. 254 */ 255 256 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) 257 { 258 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 259 struct net_device *dev = skb->dev; 260 int old; 261 unsigned long flags; 262 263 pr_debug("(vcc %p)\n", vcc); 264 clip_vcc->old_pop(vcc, skb); 265 /* skb->dev == NULL in outbound ARP packets */ 266 if (!dev) 267 return; 268 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); 269 if (atm_may_send(vcc, 0)) { 270 old = xchg(&clip_vcc->xoff, 0); 271 if (old) 272 netif_wake_queue(dev); 273 } 274 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); 275 } 276 277 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) 278 { 279 __be32 *ip = (__be32 *) neigh->primary_key; 280 281 pr_debug("(neigh %p, skb %p)\n", neigh, skb); 282 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip); 283 } 284 285 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) 286 { 287 #ifndef CONFIG_ATM_CLIP_NO_ICMP 288 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 289 #endif 290 kfree_skb(skb); 291 } 292 293 static const struct neigh_ops clip_neigh_ops = { 294 .family = AF_INET, 295 .solicit = clip_neigh_solicit, 296 .error_report = clip_neigh_error, 297 .output = neigh_direct_output, 298 .connected_output = neigh_direct_output, 299 }; 300 301 static int clip_constructor(struct net_device *dev, struct neighbour *neigh) 302 { 303 struct atmarp_entry *entry = neighbour_priv(neigh); 304 305 if (neigh->tbl->family != AF_INET) 306 return -EINVAL; 307 308 if (neigh->type != RTN_UNICAST) 309 return -EINVAL; 310 311 neigh->nud_state = NUD_NONE; 312 neigh->ops = &clip_neigh_ops; 313 neigh->output = neigh->ops->output; 314 entry->neigh = neigh; 315 entry->vccs = NULL; 316 entry->expires = jiffies - 1; 317 318 return 0; 319 } 320 321 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 322 323 /* 324 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 325 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 326 * don't increment the usage count. This is used to create entries in 327 * clip_setentry. 328 */ 329 330 static int clip_encap(struct atm_vcc *vcc, int mode) 331 { 332 if (!CLIP_VCC(vcc)) 333 return -EBADFD; 334 335 CLIP_VCC(vcc)->encap = mode; 336 return 0; 337 } 338 339 static netdev_tx_t clip_start_xmit(struct sk_buff *skb, 340 struct net_device *dev) 341 { 342 struct clip_priv *clip_priv = PRIV(dev); 343 struct dst_entry *dst = skb_dst(skb); 344 struct atmarp_entry *entry; 345 struct neighbour *n; 346 struct atm_vcc *vcc; 347 struct rtable *rt; 348 __be32 *daddr; 349 int old; 350 unsigned long flags; 351 352 pr_debug("(skb %p)\n", skb); 353 if (!dst) { 354 pr_err("skb_dst(skb) == NULL\n"); 355 dev_kfree_skb(skb); 356 dev->stats.tx_dropped++; 357 return NETDEV_TX_OK; 358 } 359 rt = dst_rtable(dst); 360 if (rt->rt_gw_family == AF_INET) 361 daddr = &rt->rt_gw4; 362 else 363 daddr = &ip_hdr(skb)->daddr; 364 n = dst_neigh_lookup(dst, daddr); 365 if (!n) { 366 pr_err("NO NEIGHBOUR !\n"); 367 dev_kfree_skb(skb); 368 dev->stats.tx_dropped++; 369 return NETDEV_TX_OK; 370 } 371 entry = neighbour_priv(n); 372 if (!entry->vccs) { 373 if (time_after(jiffies, entry->expires)) { 374 /* should be resolved */ 375 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 376 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key)); 377 } 378 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 379 skb_queue_tail(&entry->neigh->arp_queue, skb); 380 else { 381 dev_kfree_skb(skb); 382 dev->stats.tx_dropped++; 383 } 384 goto out_release_neigh; 385 } 386 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); 387 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 388 pr_debug("using neighbour %p, vcc %p\n", n, vcc); 389 if (entry->vccs->encap) { 390 void *here; 391 392 here = skb_push(skb, RFC1483LLC_LEN); 393 memcpy(here, llc_oui, sizeof(llc_oui)); 394 ((__be16 *) here)[3] = skb->protocol; 395 } 396 atm_account_tx(vcc, skb); 397 entry->vccs->last_use = jiffies; 398 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 399 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 400 if (old) { 401 pr_warn("XOFF->XOFF transition\n"); 402 goto out_release_neigh; 403 } 404 dev->stats.tx_packets++; 405 dev->stats.tx_bytes += skb->len; 406 vcc->send(vcc, skb); 407 if (atm_may_send(vcc, 0)) { 408 entry->vccs->xoff = 0; 409 goto out_release_neigh; 410 } 411 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 412 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 413 barrier(); 414 if (!entry->vccs->xoff) 415 netif_start_queue(dev); 416 /* Oh, we just raced with clip_pop. netif_start_queue should be 417 good enough, because nothing should really be asleep because 418 of the brief netif_stop_queue. If this isn't true or if it 419 changes, use netif_wake_queue instead. */ 420 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 421 out_release_neigh: 422 neigh_release(n); 423 return NETDEV_TX_OK; 424 } 425 426 static int clip_mkip(struct atm_vcc *vcc, int timeout) 427 { 428 struct clip_vcc *clip_vcc; 429 430 if (!vcc->push) 431 return -EBADFD; 432 if (vcc->user_back) 433 return -EINVAL; 434 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); 435 if (!clip_vcc) 436 return -ENOMEM; 437 pr_debug("%p vcc %p\n", clip_vcc, vcc); 438 clip_vcc->vcc = vcc; 439 vcc->user_back = clip_vcc; 440 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 441 clip_vcc->entry = NULL; 442 clip_vcc->xoff = 0; 443 clip_vcc->encap = 1; 444 clip_vcc->last_use = jiffies; 445 clip_vcc->idle_timeout = timeout * HZ; 446 clip_vcc->old_push = vcc->push; 447 clip_vcc->old_pop = vcc->pop; 448 vcc->push = clip_push; 449 vcc->pop = clip_pop; 450 451 /* re-process everything received between connection setup and MKIP */ 452 vcc_process_recv_queue(vcc); 453 454 return 0; 455 } 456 457 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 458 { 459 struct neighbour *neigh; 460 struct atmarp_entry *entry; 461 int error; 462 struct clip_vcc *clip_vcc; 463 struct rtable *rt; 464 465 if (vcc->push != clip_push) { 466 pr_warn("non-CLIP VCC\n"); 467 return -EBADF; 468 } 469 clip_vcc = CLIP_VCC(vcc); 470 if (!ip) { 471 if (!clip_vcc->entry) { 472 pr_err("hiding hidden ATMARP entry\n"); 473 return 0; 474 } 475 pr_debug("remove\n"); 476 unlink_clip_vcc(clip_vcc); 477 return 0; 478 } 479 rt = ip_route_output(&init_net, ip, 0, 0, 0, RT_SCOPE_LINK); 480 if (IS_ERR(rt)) 481 return PTR_ERR(rt); 482 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1); 483 ip_rt_put(rt); 484 if (!neigh) 485 return -ENOMEM; 486 entry = neighbour_priv(neigh); 487 if (entry != clip_vcc->entry) { 488 if (!clip_vcc->entry) 489 pr_debug("add\n"); 490 else { 491 pr_debug("update\n"); 492 unlink_clip_vcc(clip_vcc); 493 } 494 link_vcc(clip_vcc, entry); 495 } 496 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 497 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, 0); 498 neigh_release(neigh); 499 return error; 500 } 501 502 static const struct net_device_ops clip_netdev_ops = { 503 .ndo_start_xmit = clip_start_xmit, 504 .ndo_neigh_construct = clip_constructor, 505 }; 506 507 static void clip_setup(struct net_device *dev) 508 { 509 dev->netdev_ops = &clip_netdev_ops; 510 dev->type = ARPHRD_ATM; 511 dev->neigh_priv_len = sizeof(struct atmarp_entry); 512 dev->hard_header_len = RFC1483LLC_LEN; 513 dev->mtu = RFC1626_MTU; 514 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 515 /* When using a "real" qdisc, the qdisc determines the queue */ 516 /* length. tx_queue_len is only used for the default case, */ 517 /* without any more elaborate queuing. 100 is a reasonable */ 518 /* compromise between decent burst-tolerance and protection */ 519 /* against memory hogs. */ 520 netif_keep_dst(dev); 521 } 522 523 static int clip_create(int number) 524 { 525 struct net_device *dev; 526 struct clip_priv *clip_priv; 527 int error; 528 529 if (number != -1) { 530 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 531 if (PRIV(dev)->number == number) 532 return -EEXIST; 533 } else { 534 number = 0; 535 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 536 if (PRIV(dev)->number >= number) 537 number = PRIV(dev)->number + 1; 538 } 539 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN, 540 clip_setup); 541 if (!dev) 542 return -ENOMEM; 543 clip_priv = PRIV(dev); 544 sprintf(dev->name, "atm%d", number); 545 spin_lock_init(&clip_priv->xoff_lock); 546 clip_priv->number = number; 547 error = register_netdev(dev); 548 if (error) { 549 free_netdev(dev); 550 return error; 551 } 552 clip_priv->next = clip_devs; 553 clip_devs = dev; 554 pr_debug("registered (net:%s)\n", dev->name); 555 return number; 556 } 557 558 static int clip_device_event(struct notifier_block *this, unsigned long event, 559 void *ptr) 560 { 561 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 562 563 if (!net_eq(dev_net(dev), &init_net)) 564 return NOTIFY_DONE; 565 566 if (event == NETDEV_UNREGISTER) 567 return NOTIFY_DONE; 568 569 /* ignore non-CLIP devices */ 570 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) 571 return NOTIFY_DONE; 572 573 switch (event) { 574 case NETDEV_UP: 575 pr_debug("NETDEV_UP\n"); 576 to_atmarpd(act_up, PRIV(dev)->number, 0); 577 break; 578 case NETDEV_GOING_DOWN: 579 pr_debug("NETDEV_DOWN\n"); 580 to_atmarpd(act_down, PRIV(dev)->number, 0); 581 break; 582 case NETDEV_CHANGE: 583 case NETDEV_CHANGEMTU: 584 pr_debug("NETDEV_CHANGE*\n"); 585 to_atmarpd(act_change, PRIV(dev)->number, 0); 586 break; 587 } 588 return NOTIFY_DONE; 589 } 590 591 static int clip_inet_event(struct notifier_block *this, unsigned long event, 592 void *ifa) 593 { 594 struct in_device *in_dev; 595 struct netdev_notifier_info info; 596 597 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 598 /* 599 * Transitions are of the down-change-up type, so it's sufficient to 600 * handle the change on up. 601 */ 602 if (event != NETDEV_UP) 603 return NOTIFY_DONE; 604 netdev_notifier_info_init(&info, in_dev->dev); 605 return clip_device_event(this, NETDEV_CHANGE, &info); 606 } 607 608 static struct notifier_block clip_dev_notifier = { 609 .notifier_call = clip_device_event, 610 }; 611 612 613 614 static struct notifier_block clip_inet_notifier = { 615 .notifier_call = clip_inet_event, 616 }; 617 618 619 620 static void atmarpd_close(struct atm_vcc *vcc) 621 { 622 pr_debug("\n"); 623 624 mutex_lock(&atmarpd_lock); 625 RCU_INIT_POINTER(atmarpd, NULL); 626 mutex_unlock(&atmarpd_lock); 627 628 synchronize_rcu(); 629 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 630 631 pr_debug("(done)\n"); 632 module_put(THIS_MODULE); 633 } 634 635 static int atmarpd_send(struct atm_vcc *vcc, struct sk_buff *skb) 636 { 637 atm_return_tx(vcc, skb); 638 dev_kfree_skb_any(skb); 639 return 0; 640 } 641 642 static const struct atmdev_ops atmarpd_dev_ops = { 643 .close = atmarpd_close, 644 .send = atmarpd_send 645 }; 646 647 648 static struct atm_dev atmarpd_dev = { 649 .ops = &atmarpd_dev_ops, 650 .type = "arpd", 651 .number = 999, 652 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) 653 }; 654 655 656 static int atm_init_atmarp(struct atm_vcc *vcc) 657 { 658 if (vcc->push == clip_push) 659 return -EINVAL; 660 661 mutex_lock(&atmarpd_lock); 662 if (atmarpd) { 663 mutex_unlock(&atmarpd_lock); 664 return -EADDRINUSE; 665 } 666 667 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 668 669 rcu_assign_pointer(atmarpd, vcc); 670 set_bit(ATM_VF_META, &vcc->flags); 671 set_bit(ATM_VF_READY, &vcc->flags); 672 /* allow replies and avoid getting closed if signaling dies */ 673 vcc->dev = &atmarpd_dev; 674 vcc_insert_socket(sk_atm(vcc)); 675 vcc->push = NULL; 676 vcc->pop = NULL; /* crash */ 677 vcc->push_oam = NULL; /* crash */ 678 mutex_unlock(&atmarpd_lock); 679 return 0; 680 } 681 682 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 683 { 684 struct atm_vcc *vcc = ATM_SD(sock); 685 struct sock *sk = sock->sk; 686 int err = 0; 687 688 switch (cmd) { 689 case SIOCMKCLIP: 690 case ATMARPD_CTRL: 691 case ATMARP_MKIP: 692 case ATMARP_SETENTRY: 693 case ATMARP_ENCAP: 694 if (!capable(CAP_NET_ADMIN)) 695 return -EPERM; 696 break; 697 default: 698 return -ENOIOCTLCMD; 699 } 700 701 switch (cmd) { 702 case SIOCMKCLIP: 703 err = clip_create(arg); 704 break; 705 case ATMARPD_CTRL: 706 lock_sock(sk); 707 err = atm_init_atmarp(vcc); 708 if (!err) { 709 sock->state = SS_CONNECTED; 710 __module_get(THIS_MODULE); 711 } 712 release_sock(sk); 713 break; 714 case ATMARP_MKIP: 715 lock_sock(sk); 716 err = clip_mkip(vcc, arg); 717 release_sock(sk); 718 break; 719 case ATMARP_SETENTRY: 720 err = clip_setentry(vcc, (__force __be32)arg); 721 break; 722 case ATMARP_ENCAP: 723 err = clip_encap(vcc, arg); 724 break; 725 } 726 return err; 727 } 728 729 static struct atm_ioctl clip_ioctl_ops = { 730 .owner = THIS_MODULE, 731 .ioctl = clip_ioctl, 732 }; 733 734 #ifdef CONFIG_PROC_FS 735 736 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 737 { 738 static int code[] = { 1, 2, 10, 6, 1, 0 }; 739 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 740 741 if (*addr->sas_addr.pub) { 742 seq_printf(seq, "%s", addr->sas_addr.pub); 743 if (*addr->sas_addr.prv) 744 seq_putc(seq, '+'); 745 } else if (!*addr->sas_addr.prv) { 746 seq_printf(seq, "%s", "(none)"); 747 return; 748 } 749 if (*addr->sas_addr.prv) { 750 unsigned char *prv = addr->sas_addr.prv; 751 int *fields; 752 int i, j; 753 754 fields = *prv == ATM_AFI_E164 ? e164 : code; 755 for (i = 0; fields[i]; i++) { 756 for (j = fields[i]; j; j--) 757 seq_printf(seq, "%02X", *prv++); 758 if (fields[i + 1]) 759 seq_putc(seq, '.'); 760 } 761 } 762 } 763 764 /* This means the neighbour entry has no attached VCC objects. */ 765 #define SEQ_NO_VCC_TOKEN ((void *) 2) 766 767 static void atmarp_info(struct seq_file *seq, struct neighbour *n, 768 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 769 { 770 struct net_device *dev = n->dev; 771 unsigned long exp; 772 char buf[17]; 773 int svc, llc, off; 774 775 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 776 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 777 778 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 779 780 if (clip_vcc == SEQ_NO_VCC_TOKEN) 781 exp = entry->neigh->used; 782 else 783 exp = clip_vcc->last_use; 784 785 exp = (jiffies - exp) / HZ; 786 787 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 788 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 789 790 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key); 791 while (off < 16) 792 buf[off++] = ' '; 793 buf[off] = '\0'; 794 seq_printf(seq, "%s", buf); 795 796 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 797 if (time_before(jiffies, entry->expires)) 798 seq_printf(seq, "(resolving)\n"); 799 else 800 seq_printf(seq, "(expired, ref %d)\n", 801 refcount_read(&entry->neigh->refcnt)); 802 } else if (!svc) { 803 seq_printf(seq, "%d.%d.%d\n", 804 clip_vcc->vcc->dev->number, 805 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 806 } else { 807 svc_addr(seq, &clip_vcc->vcc->remote); 808 seq_putc(seq, '\n'); 809 } 810 } 811 812 struct clip_seq_state { 813 /* This member must be first. */ 814 struct neigh_seq_state ns; 815 816 /* Local to clip specific iteration. */ 817 struct clip_vcc *vcc; 818 }; 819 820 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 821 struct clip_vcc *curr) 822 { 823 if (!curr) { 824 curr = e->vccs; 825 if (!curr) 826 return SEQ_NO_VCC_TOKEN; 827 return curr; 828 } 829 if (curr == SEQ_NO_VCC_TOKEN) 830 return NULL; 831 832 curr = curr->next; 833 834 return curr; 835 } 836 837 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 838 struct atmarp_entry *e, loff_t * pos) 839 { 840 struct clip_vcc *vcc = state->vcc; 841 842 vcc = clip_seq_next_vcc(e, vcc); 843 if (vcc && pos != NULL) { 844 while (*pos) { 845 vcc = clip_seq_next_vcc(e, vcc); 846 if (!vcc) 847 break; 848 --(*pos); 849 } 850 } 851 state->vcc = vcc; 852 853 return vcc; 854 } 855 856 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 857 struct neighbour *n, loff_t * pos) 858 { 859 struct clip_seq_state *state = (struct clip_seq_state *)_state; 860 861 if (n->dev->type != ARPHRD_ATM) 862 return NULL; 863 864 return clip_seq_vcc_walk(state, neighbour_priv(n), pos); 865 } 866 867 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 868 { 869 struct clip_seq_state *state = seq->private; 870 state->ns.neigh_sub_iter = clip_seq_sub_iter; 871 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY); 872 } 873 874 static int clip_seq_show(struct seq_file *seq, void *v) 875 { 876 static char atm_arp_banner[] = 877 "IPitf TypeEncp Idle IP address ATM address\n"; 878 879 if (v == SEQ_START_TOKEN) { 880 seq_puts(seq, atm_arp_banner); 881 } else { 882 struct clip_seq_state *state = seq->private; 883 struct clip_vcc *vcc = state->vcc; 884 struct neighbour *n = v; 885 886 atmarp_info(seq, n, neighbour_priv(n), vcc); 887 } 888 return 0; 889 } 890 891 static const struct seq_operations arp_seq_ops = { 892 .start = clip_seq_start, 893 .next = neigh_seq_next, 894 .stop = neigh_seq_stop, 895 .show = clip_seq_show, 896 }; 897 #endif 898 899 static void atm_clip_exit_noproc(void); 900 901 static int __init atm_clip_init(void) 902 { 903 register_atm_ioctl(&clip_ioctl_ops); 904 register_netdevice_notifier(&clip_dev_notifier); 905 register_inetaddr_notifier(&clip_inet_notifier); 906 907 timer_setup(&idle_timer, idle_timer_check, 0); 908 909 #ifdef CONFIG_PROC_FS 910 { 911 struct proc_dir_entry *p; 912 913 p = proc_create_net("arp", 0444, atm_proc_root, &arp_seq_ops, 914 sizeof(struct clip_seq_state)); 915 if (!p) { 916 pr_err("Unable to initialize /proc/net/atm/arp\n"); 917 atm_clip_exit_noproc(); 918 return -ENOMEM; 919 } 920 } 921 #endif 922 923 return 0; 924 } 925 926 static void atm_clip_exit_noproc(void) 927 { 928 struct net_device *dev, *next; 929 930 unregister_inetaddr_notifier(&clip_inet_notifier); 931 unregister_netdevice_notifier(&clip_dev_notifier); 932 933 deregister_atm_ioctl(&clip_ioctl_ops); 934 935 /* First, stop the idle timer, so it stops banging 936 * on the table. 937 */ 938 timer_delete_sync(&idle_timer); 939 940 dev = clip_devs; 941 while (dev) { 942 next = PRIV(dev)->next; 943 unregister_netdev(dev); 944 free_netdev(dev); 945 dev = next; 946 } 947 } 948 949 static void __exit atm_clip_exit(void) 950 { 951 remove_proc_entry("arp", atm_proc_root); 952 953 atm_clip_exit_noproc(); 954 } 955 956 module_init(atm_clip_init); 957 module_exit(atm_clip_exit); 958 MODULE_AUTHOR("Werner Almesberger"); 959 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 960 MODULE_LICENSE("GPL"); 961