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