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 = (struct atmarp_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, skb->len); 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); 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 (atomic_read(&n->refcnt) > 1) { 141 struct sk_buff *skb; 142 143 pr_debug("destruction postponed with ref %d\n", 144 atomic_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(unsigned long dummy) 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 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 CLIP_VCC(vcc)->encap = mode; 321 return 0; 322 } 323 324 static netdev_tx_t clip_start_xmit(struct sk_buff *skb, 325 struct net_device *dev) 326 { 327 struct clip_priv *clip_priv = PRIV(dev); 328 struct dst_entry *dst = skb_dst(skb); 329 struct atmarp_entry *entry; 330 struct neighbour *n; 331 struct atm_vcc *vcc; 332 struct rtable *rt; 333 __be32 *daddr; 334 int old; 335 unsigned long flags; 336 337 pr_debug("(skb %p)\n", skb); 338 if (!dst) { 339 pr_err("skb_dst(skb) == NULL\n"); 340 dev_kfree_skb(skb); 341 dev->stats.tx_dropped++; 342 return NETDEV_TX_OK; 343 } 344 rt = (struct rtable *) dst; 345 if (rt->rt_gateway) 346 daddr = &rt->rt_gateway; 347 else 348 daddr = &ip_hdr(skb)->daddr; 349 n = dst_neigh_lookup(dst, daddr); 350 if (!n) { 351 pr_err("NO NEIGHBOUR !\n"); 352 dev_kfree_skb(skb); 353 dev->stats.tx_dropped++; 354 return NETDEV_TX_OK; 355 } 356 entry = neighbour_priv(n); 357 if (!entry->vccs) { 358 if (time_after(jiffies, entry->expires)) { 359 /* should be resolved */ 360 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 361 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key)); 362 } 363 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 364 skb_queue_tail(&entry->neigh->arp_queue, skb); 365 else { 366 dev_kfree_skb(skb); 367 dev->stats.tx_dropped++; 368 } 369 goto out_release_neigh; 370 } 371 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); 372 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 373 pr_debug("using neighbour %p, vcc %p\n", n, vcc); 374 if (entry->vccs->encap) { 375 void *here; 376 377 here = skb_push(skb, RFC1483LLC_LEN); 378 memcpy(here, llc_oui, sizeof(llc_oui)); 379 ((__be16 *) here)[3] = skb->protocol; 380 } 381 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 382 ATM_SKB(skb)->atm_options = vcc->atm_options; 383 entry->vccs->last_use = jiffies; 384 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 385 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 386 if (old) { 387 pr_warning("XOFF->XOFF transition\n"); 388 goto out_release_neigh; 389 } 390 dev->stats.tx_packets++; 391 dev->stats.tx_bytes += skb->len; 392 vcc->send(vcc, skb); 393 if (atm_may_send(vcc, 0)) { 394 entry->vccs->xoff = 0; 395 goto out_release_neigh; 396 } 397 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 398 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 399 barrier(); 400 if (!entry->vccs->xoff) 401 netif_start_queue(dev); 402 /* Oh, we just raced with clip_pop. netif_start_queue should be 403 good enough, because nothing should really be asleep because 404 of the brief netif_stop_queue. If this isn't true or if it 405 changes, use netif_wake_queue instead. */ 406 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 407 out_release_neigh: 408 neigh_release(n); 409 return NETDEV_TX_OK; 410 } 411 412 static int clip_mkip(struct atm_vcc *vcc, int timeout) 413 { 414 struct clip_vcc *clip_vcc; 415 416 if (!vcc->push) 417 return -EBADFD; 418 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); 419 if (!clip_vcc) 420 return -ENOMEM; 421 pr_debug("%p vcc %p\n", clip_vcc, vcc); 422 clip_vcc->vcc = vcc; 423 vcc->user_back = clip_vcc; 424 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 425 clip_vcc->entry = NULL; 426 clip_vcc->xoff = 0; 427 clip_vcc->encap = 1; 428 clip_vcc->last_use = jiffies; 429 clip_vcc->idle_timeout = timeout * HZ; 430 clip_vcc->old_push = vcc->push; 431 clip_vcc->old_pop = vcc->pop; 432 vcc->push = clip_push; 433 vcc->pop = clip_pop; 434 435 /* re-process everything received between connection setup and MKIP */ 436 vcc_process_recv_queue(vcc); 437 438 return 0; 439 } 440 441 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 442 { 443 struct neighbour *neigh; 444 struct atmarp_entry *entry; 445 int error; 446 struct clip_vcc *clip_vcc; 447 struct rtable *rt; 448 449 if (vcc->push != clip_push) { 450 pr_warning("non-CLIP VCC\n"); 451 return -EBADF; 452 } 453 clip_vcc = CLIP_VCC(vcc); 454 if (!ip) { 455 if (!clip_vcc->entry) { 456 pr_err("hiding hidden ATMARP entry\n"); 457 return 0; 458 } 459 pr_debug("remove\n"); 460 unlink_clip_vcc(clip_vcc); 461 return 0; 462 } 463 rt = ip_route_output(&init_net, ip, 0, 1, 0); 464 if (IS_ERR(rt)) 465 return PTR_ERR(rt); 466 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1); 467 ip_rt_put(rt); 468 if (!neigh) 469 return -ENOMEM; 470 entry = neighbour_priv(neigh); 471 if (entry != clip_vcc->entry) { 472 if (!clip_vcc->entry) 473 pr_debug("add\n"); 474 else { 475 pr_debug("update\n"); 476 unlink_clip_vcc(clip_vcc); 477 } 478 link_vcc(clip_vcc, entry); 479 } 480 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 481 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); 482 neigh_release(neigh); 483 return error; 484 } 485 486 static const struct net_device_ops clip_netdev_ops = { 487 .ndo_start_xmit = clip_start_xmit, 488 .ndo_neigh_construct = clip_constructor, 489 }; 490 491 static void clip_setup(struct net_device *dev) 492 { 493 dev->netdev_ops = &clip_netdev_ops; 494 dev->type = ARPHRD_ATM; 495 dev->neigh_priv_len = sizeof(struct atmarp_entry); 496 dev->hard_header_len = RFC1483LLC_LEN; 497 dev->mtu = RFC1626_MTU; 498 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 499 /* When using a "real" qdisc, the qdisc determines the queue */ 500 /* length. tx_queue_len is only used for the default case, */ 501 /* without any more elaborate queuing. 100 is a reasonable */ 502 /* compromise between decent burst-tolerance and protection */ 503 /* against memory hogs. */ 504 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 505 } 506 507 static int clip_create(int number) 508 { 509 struct net_device *dev; 510 struct clip_priv *clip_priv; 511 int error; 512 513 if (number != -1) { 514 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 515 if (PRIV(dev)->number == number) 516 return -EEXIST; 517 } else { 518 number = 0; 519 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 520 if (PRIV(dev)->number >= number) 521 number = PRIV(dev)->number + 1; 522 } 523 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 524 if (!dev) 525 return -ENOMEM; 526 clip_priv = PRIV(dev); 527 sprintf(dev->name, "atm%d", number); 528 spin_lock_init(&clip_priv->xoff_lock); 529 clip_priv->number = number; 530 error = register_netdev(dev); 531 if (error) { 532 free_netdev(dev); 533 return error; 534 } 535 clip_priv->next = clip_devs; 536 clip_devs = dev; 537 pr_debug("registered (net:%s)\n", dev->name); 538 return number; 539 } 540 541 static int clip_device_event(struct notifier_block *this, unsigned long event, 542 void *arg) 543 { 544 struct net_device *dev = arg; 545 546 if (!net_eq(dev_net(dev), &init_net)) 547 return NOTIFY_DONE; 548 549 if (event == NETDEV_UNREGISTER) 550 return NOTIFY_DONE; 551 552 /* ignore non-CLIP devices */ 553 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) 554 return NOTIFY_DONE; 555 556 switch (event) { 557 case NETDEV_UP: 558 pr_debug("NETDEV_UP\n"); 559 to_atmarpd(act_up, PRIV(dev)->number, 0); 560 break; 561 case NETDEV_GOING_DOWN: 562 pr_debug("NETDEV_DOWN\n"); 563 to_atmarpd(act_down, PRIV(dev)->number, 0); 564 break; 565 case NETDEV_CHANGE: 566 case NETDEV_CHANGEMTU: 567 pr_debug("NETDEV_CHANGE*\n"); 568 to_atmarpd(act_change, PRIV(dev)->number, 0); 569 break; 570 } 571 return NOTIFY_DONE; 572 } 573 574 static int clip_inet_event(struct notifier_block *this, unsigned long event, 575 void *ifa) 576 { 577 struct in_device *in_dev; 578 579 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 580 /* 581 * Transitions are of the down-change-up type, so it's sufficient to 582 * handle the change on up. 583 */ 584 if (event != NETDEV_UP) 585 return NOTIFY_DONE; 586 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); 587 } 588 589 static struct notifier_block clip_dev_notifier = { 590 .notifier_call = clip_device_event, 591 }; 592 593 594 595 static struct notifier_block clip_inet_notifier = { 596 .notifier_call = clip_inet_event, 597 }; 598 599 600 601 static void atmarpd_close(struct atm_vcc *vcc) 602 { 603 pr_debug("\n"); 604 605 rtnl_lock(); 606 atmarpd = NULL; 607 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 608 rtnl_unlock(); 609 610 pr_debug("(done)\n"); 611 module_put(THIS_MODULE); 612 } 613 614 static struct atmdev_ops atmarpd_dev_ops = { 615 .close = atmarpd_close 616 }; 617 618 619 static struct atm_dev atmarpd_dev = { 620 .ops = &atmarpd_dev_ops, 621 .type = "arpd", 622 .number = 999, 623 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) 624 }; 625 626 627 static int atm_init_atmarp(struct atm_vcc *vcc) 628 { 629 rtnl_lock(); 630 if (atmarpd) { 631 rtnl_unlock(); 632 return -EADDRINUSE; 633 } 634 635 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 636 637 atmarpd = vcc; 638 set_bit(ATM_VF_META, &vcc->flags); 639 set_bit(ATM_VF_READY, &vcc->flags); 640 /* allow replies and avoid getting closed if signaling dies */ 641 vcc->dev = &atmarpd_dev; 642 vcc_insert_socket(sk_atm(vcc)); 643 vcc->push = NULL; 644 vcc->pop = NULL; /* crash */ 645 vcc->push_oam = NULL; /* crash */ 646 rtnl_unlock(); 647 return 0; 648 } 649 650 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 651 { 652 struct atm_vcc *vcc = ATM_SD(sock); 653 int err = 0; 654 655 switch (cmd) { 656 case SIOCMKCLIP: 657 case ATMARPD_CTRL: 658 case ATMARP_MKIP: 659 case ATMARP_SETENTRY: 660 case ATMARP_ENCAP: 661 if (!capable(CAP_NET_ADMIN)) 662 return -EPERM; 663 break; 664 default: 665 return -ENOIOCTLCMD; 666 } 667 668 switch (cmd) { 669 case SIOCMKCLIP: 670 err = clip_create(arg); 671 break; 672 case ATMARPD_CTRL: 673 err = atm_init_atmarp(vcc); 674 if (!err) { 675 sock->state = SS_CONNECTED; 676 __module_get(THIS_MODULE); 677 } 678 break; 679 case ATMARP_MKIP: 680 err = clip_mkip(vcc, arg); 681 break; 682 case ATMARP_SETENTRY: 683 err = clip_setentry(vcc, (__force __be32)arg); 684 break; 685 case ATMARP_ENCAP: 686 err = clip_encap(vcc, arg); 687 break; 688 } 689 return err; 690 } 691 692 static struct atm_ioctl clip_ioctl_ops = { 693 .owner = THIS_MODULE, 694 .ioctl = clip_ioctl, 695 }; 696 697 #ifdef CONFIG_PROC_FS 698 699 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 700 { 701 static int code[] = { 1, 2, 10, 6, 1, 0 }; 702 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 703 704 if (*addr->sas_addr.pub) { 705 seq_printf(seq, "%s", addr->sas_addr.pub); 706 if (*addr->sas_addr.prv) 707 seq_putc(seq, '+'); 708 } else if (!*addr->sas_addr.prv) { 709 seq_printf(seq, "%s", "(none)"); 710 return; 711 } 712 if (*addr->sas_addr.prv) { 713 unsigned char *prv = addr->sas_addr.prv; 714 int *fields; 715 int i, j; 716 717 fields = *prv == ATM_AFI_E164 ? e164 : code; 718 for (i = 0; fields[i]; i++) { 719 for (j = fields[i]; j; j--) 720 seq_printf(seq, "%02X", *prv++); 721 if (fields[i + 1]) 722 seq_putc(seq, '.'); 723 } 724 } 725 } 726 727 /* This means the neighbour entry has no attached VCC objects. */ 728 #define SEQ_NO_VCC_TOKEN ((void *) 2) 729 730 static void atmarp_info(struct seq_file *seq, struct neighbour *n, 731 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 732 { 733 struct net_device *dev = n->dev; 734 unsigned long exp; 735 char buf[17]; 736 int svc, llc, off; 737 738 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 739 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 740 741 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 742 743 if (clip_vcc == SEQ_NO_VCC_TOKEN) 744 exp = entry->neigh->used; 745 else 746 exp = clip_vcc->last_use; 747 748 exp = (jiffies - exp) / HZ; 749 750 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 751 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 752 753 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key); 754 while (off < 16) 755 buf[off++] = ' '; 756 buf[off] = '\0'; 757 seq_printf(seq, "%s", buf); 758 759 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 760 if (time_before(jiffies, entry->expires)) 761 seq_printf(seq, "(resolving)\n"); 762 else 763 seq_printf(seq, "(expired, ref %d)\n", 764 atomic_read(&entry->neigh->refcnt)); 765 } else if (!svc) { 766 seq_printf(seq, "%d.%d.%d\n", 767 clip_vcc->vcc->dev->number, 768 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 769 } else { 770 svc_addr(seq, &clip_vcc->vcc->remote); 771 seq_putc(seq, '\n'); 772 } 773 } 774 775 struct clip_seq_state { 776 /* This member must be first. */ 777 struct neigh_seq_state ns; 778 779 /* Local to clip specific iteration. */ 780 struct clip_vcc *vcc; 781 }; 782 783 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 784 struct clip_vcc *curr) 785 { 786 if (!curr) { 787 curr = e->vccs; 788 if (!curr) 789 return SEQ_NO_VCC_TOKEN; 790 return curr; 791 } 792 if (curr == SEQ_NO_VCC_TOKEN) 793 return NULL; 794 795 curr = curr->next; 796 797 return curr; 798 } 799 800 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 801 struct atmarp_entry *e, loff_t * pos) 802 { 803 struct clip_vcc *vcc = state->vcc; 804 805 vcc = clip_seq_next_vcc(e, vcc); 806 if (vcc && pos != NULL) { 807 while (*pos) { 808 vcc = clip_seq_next_vcc(e, vcc); 809 if (!vcc) 810 break; 811 --(*pos); 812 } 813 } 814 state->vcc = vcc; 815 816 return vcc; 817 } 818 819 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 820 struct neighbour *n, loff_t * pos) 821 { 822 struct clip_seq_state *state = (struct clip_seq_state *)_state; 823 824 if (n->dev->type != ARPHRD_ATM) 825 return NULL; 826 827 return clip_seq_vcc_walk(state, neighbour_priv(n), pos); 828 } 829 830 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 831 { 832 struct clip_seq_state *state = seq->private; 833 state->ns.neigh_sub_iter = clip_seq_sub_iter; 834 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY); 835 } 836 837 static int clip_seq_show(struct seq_file *seq, void *v) 838 { 839 static char atm_arp_banner[] = 840 "IPitf TypeEncp Idle IP address ATM address\n"; 841 842 if (v == SEQ_START_TOKEN) { 843 seq_puts(seq, atm_arp_banner); 844 } else { 845 struct clip_seq_state *state = seq->private; 846 struct clip_vcc *vcc = state->vcc; 847 struct neighbour *n = v; 848 849 atmarp_info(seq, n, neighbour_priv(n), vcc); 850 } 851 return 0; 852 } 853 854 static const struct seq_operations arp_seq_ops = { 855 .start = clip_seq_start, 856 .next = neigh_seq_next, 857 .stop = neigh_seq_stop, 858 .show = clip_seq_show, 859 }; 860 861 static int arp_seq_open(struct inode *inode, struct file *file) 862 { 863 return seq_open_net(inode, file, &arp_seq_ops, 864 sizeof(struct clip_seq_state)); 865 } 866 867 static const struct file_operations arp_seq_fops = { 868 .open = arp_seq_open, 869 .read = seq_read, 870 .llseek = seq_lseek, 871 .release = seq_release_net, 872 .owner = THIS_MODULE 873 }; 874 #endif 875 876 static void atm_clip_exit_noproc(void); 877 878 static int __init atm_clip_init(void) 879 { 880 register_atm_ioctl(&clip_ioctl_ops); 881 register_netdevice_notifier(&clip_dev_notifier); 882 register_inetaddr_notifier(&clip_inet_notifier); 883 884 setup_timer(&idle_timer, idle_timer_check, 0); 885 886 #ifdef CONFIG_PROC_FS 887 { 888 struct proc_dir_entry *p; 889 890 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); 891 if (!p) { 892 pr_err("Unable to initialize /proc/net/atm/arp\n"); 893 atm_clip_exit_noproc(); 894 return -ENOMEM; 895 } 896 } 897 #endif 898 899 return 0; 900 } 901 902 static void atm_clip_exit_noproc(void) 903 { 904 struct net_device *dev, *next; 905 906 unregister_inetaddr_notifier(&clip_inet_notifier); 907 unregister_netdevice_notifier(&clip_dev_notifier); 908 909 deregister_atm_ioctl(&clip_ioctl_ops); 910 911 /* First, stop the idle timer, so it stops banging 912 * on the table. 913 */ 914 del_timer_sync(&idle_timer); 915 916 dev = clip_devs; 917 while (dev) { 918 next = PRIV(dev)->next; 919 unregister_netdev(dev); 920 free_netdev(dev); 921 dev = next; 922 } 923 } 924 925 static void __exit atm_clip_exit(void) 926 { 927 remove_proc_entry("arp", atm_proc_root); 928 929 atm_clip_exit_noproc(); 930 } 931 932 module_init(atm_clip_init); 933 module_exit(atm_clip_exit); 934 MODULE_AUTHOR("Werner Almesberger"); 935 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 936 MODULE_LICENSE("GPL"); 937