1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */ 2 3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 4 5 #include <linux/string.h> 6 #include <linux/errno.h> 7 #include <linux/kernel.h> /* for UINT_MAX */ 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/netdevice.h> 11 #include <linux/skbuff.h> 12 #include <linux/wait.h> 13 #include <linux/timer.h> 14 #include <linux/if_arp.h> /* for some manifest constants */ 15 #include <linux/notifier.h> 16 #include <linux/atm.h> 17 #include <linux/atmdev.h> 18 #include <linux/atmclip.h> 19 #include <linux/atmarp.h> 20 #include <linux/capability.h> 21 #include <linux/ip.h> /* for net/route.h */ 22 #include <linux/in.h> /* for struct sockaddr_in */ 23 #include <linux/if.h> /* for IFF_UP */ 24 #include <linux/inetdevice.h> 25 #include <linux/bitops.h> 26 #include <linux/poison.h> 27 #include <linux/proc_fs.h> 28 #include <linux/seq_file.h> 29 #include <linux/rcupdate.h> 30 #include <linux/jhash.h> 31 #include <net/route.h> /* for struct rtable and routing */ 32 #include <net/icmp.h> /* icmp_send */ 33 #include <asm/param.h> /* for HZ */ 34 #include <asm/byteorder.h> /* for htons etc. */ 35 #include <asm/system.h> /* save/restore_flags */ 36 #include <asm/uaccess.h> 37 #include <asm/atomic.h> 38 39 #include "common.h" 40 #include "resources.h" 41 #include <net/atmclip.h> 42 43 static struct net_device *clip_devs; 44 static struct atm_vcc *atmarpd; 45 static struct neigh_table clip_tbl; 46 static struct timer_list idle_timer; 47 48 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) 49 { 50 struct sock *sk; 51 struct atmarp_ctrl *ctrl; 52 struct sk_buff *skb; 53 54 pr_debug("to_atmarpd(%d)\n", type); 55 if (!atmarpd) 56 return -EUNATCH; 57 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); 58 if (!skb) 59 return -ENOMEM; 60 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); 61 ctrl->type = type; 62 ctrl->itf_num = itf; 63 ctrl->ip = ip; 64 atm_force_charge(atmarpd, skb->truesize); 65 66 sk = sk_atm(atmarpd); 67 skb_queue_tail(&sk->sk_receive_queue, skb); 68 sk->sk_data_ready(sk, skb->len); 69 return 0; 70 } 71 72 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) 73 { 74 pr_debug("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, 75 entry->neigh); 76 clip_vcc->entry = entry; 77 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 78 clip_vcc->next = entry->vccs; 79 entry->vccs = clip_vcc; 80 entry->neigh->used = jiffies; 81 } 82 83 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 84 { 85 struct atmarp_entry *entry = clip_vcc->entry; 86 struct clip_vcc **walk; 87 88 if (!entry) { 89 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); 90 return; 91 } 92 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ 93 entry->neigh->used = jiffies; 94 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 95 if (*walk == clip_vcc) { 96 int error; 97 98 *walk = clip_vcc->next; /* atomic */ 99 clip_vcc->entry = NULL; 100 if (clip_vcc->xoff) 101 netif_wake_queue(entry->neigh->dev); 102 if (entry->vccs) 103 goto out; 104 entry->expires = jiffies - 1; 105 /* force resolution or expiration */ 106 error = neigh_update(entry->neigh, NULL, NUD_NONE, 107 NEIGH_UPDATE_F_ADMIN); 108 if (error) 109 printk(KERN_CRIT "unlink_clip_vcc: " 110 "neigh_update failed with %d\n", error); 111 goto out; 112 } 113 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " 114 "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 = NEIGH2ENTRY(n); 123 struct clip_vcc *cv; 124 125 for (cv = entry->vccs; cv; cv = cv->next) { 126 unsigned long exp = cv->last_use + cv->idle_timeout; 127 128 if (cv->idle_timeout && time_after(jiffies, exp)) { 129 pr_debug("releasing vcc %p->%p of entry %p\n", 130 cv, cv->vcc, entry); 131 vcc_release_async(cv->vcc, -ETIMEDOUT); 132 } 133 } 134 135 if (entry->vccs || time_before(jiffies, entry->expires)) 136 return 0; 137 138 if (atomic_read(&n->refcnt) > 1) { 139 struct sk_buff *skb; 140 141 pr_debug("destruction postponed with ref %d\n", 142 atomic_read(&n->refcnt)); 143 144 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 145 dev_kfree_skb(skb); 146 147 return 0; 148 } 149 150 pr_debug("expired neigh %p\n", n); 151 return 1; 152 } 153 154 static void idle_timer_check(unsigned long dummy) 155 { 156 write_lock(&clip_tbl.lock); 157 __neigh_for_each_release(&clip_tbl, neigh_check_cb); 158 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 159 write_unlock(&clip_tbl.lock); 160 } 161 162 static int clip_arp_rcv(struct sk_buff *skb) 163 { 164 struct atm_vcc *vcc; 165 166 pr_debug("clip_arp_rcv\n"); 167 vcc = ATM_SKB(skb)->vcc; 168 if (!vcc || !atm_charge(vcc, skb->truesize)) { 169 dev_kfree_skb_any(skb); 170 return 0; 171 } 172 pr_debug("pushing to %p\n", vcc); 173 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push); 174 CLIP_VCC(vcc)->old_push(vcc, skb); 175 return 0; 176 } 177 178 static const unsigned char llc_oui[] = { 179 0xaa, /* DSAP: non-ISO */ 180 0xaa, /* SSAP: non-ISO */ 181 0x03, /* Ctrl: Unnumbered Information Command PDU */ 182 0x00, /* OUI: EtherType */ 183 0x00, 184 0x00 185 }; 186 187 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) 188 { 189 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 190 191 pr_debug("clip push\n"); 192 if (!skb) { 193 pr_debug("removing VCC %p\n", clip_vcc); 194 if (clip_vcc->entry) 195 unlink_clip_vcc(clip_vcc); 196 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ 197 kfree(clip_vcc); 198 return; 199 } 200 atm_return(vcc, skb->truesize); 201 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; 202 /* clip_vcc->entry == NULL if we don't have an IP address yet */ 203 if (!skb->dev) { 204 dev_kfree_skb_any(skb); 205 return; 206 } 207 ATM_SKB(skb)->vcc = vcc; 208 skb_reset_mac_header(skb); 209 if (!clip_vcc->encap 210 || skb->len < RFC1483LLC_LEN 211 || memcmp(skb->data, llc_oui, sizeof (llc_oui))) 212 skb->protocol = htons(ETH_P_IP); 213 else { 214 skb->protocol = ((__be16 *) skb->data)[3]; 215 skb_pull(skb, RFC1483LLC_LEN); 216 if (skb->protocol == htons(ETH_P_ARP)) { 217 skb->dev->stats.rx_packets++; 218 skb->dev->stats.rx_bytes += skb->len; 219 clip_arp_rcv(skb); 220 return; 221 } 222 } 223 clip_vcc->last_use = jiffies; 224 skb->dev->stats.rx_packets++; 225 skb->dev->stats.rx_bytes += skb->len; 226 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 227 netif_rx(skb); 228 } 229 230 /* 231 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that 232 * clip_pop is atomic with respect to the critical section in clip_start_xmit. 233 */ 234 235 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) 236 { 237 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 238 struct net_device *dev = skb->dev; 239 int old; 240 unsigned long flags; 241 242 pr_debug("clip_pop(vcc %p)\n", vcc); 243 clip_vcc->old_pop(vcc, skb); 244 /* skb->dev == NULL in outbound ARP packets */ 245 if (!dev) 246 return; 247 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); 248 if (atm_may_send(vcc, 0)) { 249 old = xchg(&clip_vcc->xoff, 0); 250 if (old) 251 netif_wake_queue(dev); 252 } 253 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); 254 } 255 256 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) 257 { 258 pr_debug("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); 259 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); 260 } 261 262 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) 263 { 264 #ifndef CONFIG_ATM_CLIP_NO_ICMP 265 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 266 #endif 267 kfree_skb(skb); 268 } 269 270 static struct neigh_ops clip_neigh_ops = { 271 .family = AF_INET, 272 .solicit = clip_neigh_solicit, 273 .error_report = clip_neigh_error, 274 .output = dev_queue_xmit, 275 .connected_output = dev_queue_xmit, 276 .hh_output = dev_queue_xmit, 277 .queue_xmit = dev_queue_xmit, 278 }; 279 280 static int clip_constructor(struct neighbour *neigh) 281 { 282 struct atmarp_entry *entry = NEIGH2ENTRY(neigh); 283 struct net_device *dev = neigh->dev; 284 struct in_device *in_dev; 285 struct neigh_parms *parms; 286 287 pr_debug("clip_constructor (neigh %p, entry %p)\n", neigh, entry); 288 neigh->type = inet_addr_type(&init_net, entry->ip); 289 if (neigh->type != RTN_UNICAST) 290 return -EINVAL; 291 292 rcu_read_lock(); 293 in_dev = __in_dev_get_rcu(dev); 294 if (!in_dev) { 295 rcu_read_unlock(); 296 return -EINVAL; 297 } 298 299 parms = in_dev->arp_parms; 300 __neigh_parms_put(neigh->parms); 301 neigh->parms = neigh_parms_clone(parms); 302 rcu_read_unlock(); 303 304 neigh->ops = &clip_neigh_ops; 305 neigh->output = neigh->nud_state & NUD_VALID ? 306 neigh->ops->connected_output : neigh->ops->output; 307 entry->neigh = neigh; 308 entry->vccs = NULL; 309 entry->expires = jiffies - 1; 310 return 0; 311 } 312 313 static u32 clip_hash(const void *pkey, const struct net_device *dev) 314 { 315 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); 316 } 317 318 static struct neigh_table clip_tbl = { 319 .family = AF_INET, 320 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), 321 .key_len = 4, 322 .hash = clip_hash, 323 .constructor = clip_constructor, 324 .id = "clip_arp_cache", 325 326 /* parameters are copied from ARP ... */ 327 .parms = { 328 .tbl = &clip_tbl, 329 .base_reachable_time = 30 * HZ, 330 .retrans_time = 1 * HZ, 331 .gc_staletime = 60 * HZ, 332 .reachable_time = 30 * HZ, 333 .delay_probe_time = 5 * HZ, 334 .queue_len = 3, 335 .ucast_probes = 3, 336 .mcast_probes = 3, 337 .anycast_delay = 1 * HZ, 338 .proxy_delay = (8 * HZ) / 10, 339 .proxy_qlen = 64, 340 .locktime = 1 * HZ, 341 }, 342 .gc_interval = 30 * HZ, 343 .gc_thresh1 = 128, 344 .gc_thresh2 = 512, 345 .gc_thresh3 = 1024, 346 }; 347 348 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 349 350 /* 351 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 352 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 353 * don't increment the usage count. This is used to create entries in 354 * clip_setentry. 355 */ 356 357 static int clip_encap(struct atm_vcc *vcc, int mode) 358 { 359 CLIP_VCC(vcc)->encap = mode; 360 return 0; 361 } 362 363 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) 364 { 365 struct clip_priv *clip_priv = PRIV(dev); 366 struct atmarp_entry *entry; 367 struct atm_vcc *vcc; 368 int old; 369 unsigned long flags; 370 371 pr_debug("clip_start_xmit (skb %p)\n", skb); 372 if (!skb_dst(skb)) { 373 printk(KERN_ERR "clip_start_xmit: skb_dst(skb) == NULL\n"); 374 dev_kfree_skb(skb); 375 dev->stats.tx_dropped++; 376 return 0; 377 } 378 if (!skb_dst(skb)->neighbour) { 379 #if 0 380 skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1); 381 if (!skb_dst(skb)->neighbour) { 382 dev_kfree_skb(skb); /* lost that one */ 383 dev->stats.tx_dropped++; 384 return 0; 385 } 386 #endif 387 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); 388 dev_kfree_skb(skb); 389 dev->stats.tx_dropped++; 390 return 0; 391 } 392 entry = NEIGH2ENTRY(skb_dst(skb)->neighbour); 393 if (!entry->vccs) { 394 if (time_after(jiffies, entry->expires)) { 395 /* should be resolved */ 396 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 397 to_atmarpd(act_need, PRIV(dev)->number, entry->ip); 398 } 399 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 400 skb_queue_tail(&entry->neigh->arp_queue, skb); 401 else { 402 dev_kfree_skb(skb); 403 dev->stats.tx_dropped++; 404 } 405 return 0; 406 } 407 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); 408 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 409 pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb)->neighbour, vcc); 410 if (entry->vccs->encap) { 411 void *here; 412 413 here = skb_push(skb, RFC1483LLC_LEN); 414 memcpy(here, llc_oui, sizeof(llc_oui)); 415 ((__be16 *) here)[3] = skb->protocol; 416 } 417 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 418 ATM_SKB(skb)->atm_options = vcc->atm_options; 419 entry->vccs->last_use = jiffies; 420 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 421 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 422 if (old) { 423 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); 424 return 0; 425 } 426 dev->stats.tx_packets++; 427 dev->stats.tx_bytes += skb->len; 428 vcc->send(vcc, skb); 429 if (atm_may_send(vcc, 0)) { 430 entry->vccs->xoff = 0; 431 return 0; 432 } 433 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 434 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 435 barrier(); 436 if (!entry->vccs->xoff) 437 netif_start_queue(dev); 438 /* Oh, we just raced with clip_pop. netif_start_queue should be 439 good enough, because nothing should really be asleep because 440 of the brief netif_stop_queue. If this isn't true or if it 441 changes, use netif_wake_queue instead. */ 442 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 443 return 0; 444 } 445 446 static int clip_mkip(struct atm_vcc *vcc, int timeout) 447 { 448 struct sk_buff_head *rq, queue; 449 struct clip_vcc *clip_vcc; 450 struct sk_buff *skb, *tmp; 451 unsigned long flags; 452 453 if (!vcc->push) 454 return -EBADFD; 455 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); 456 if (!clip_vcc) 457 return -ENOMEM; 458 pr_debug("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc); 459 clip_vcc->vcc = vcc; 460 vcc->user_back = clip_vcc; 461 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 462 clip_vcc->entry = NULL; 463 clip_vcc->xoff = 0; 464 clip_vcc->encap = 1; 465 clip_vcc->last_use = jiffies; 466 clip_vcc->idle_timeout = timeout * HZ; 467 clip_vcc->old_push = vcc->push; 468 clip_vcc->old_pop = vcc->pop; 469 vcc->push = clip_push; 470 vcc->pop = clip_pop; 471 472 __skb_queue_head_init(&queue); 473 rq = &sk_atm(vcc)->sk_receive_queue; 474 475 spin_lock_irqsave(&rq->lock, flags); 476 skb_queue_splice_init(rq, &queue); 477 spin_unlock_irqrestore(&rq->lock, flags); 478 479 /* re-process everything received between connection setup and MKIP */ 480 skb_queue_walk_safe(&queue, skb, tmp) { 481 if (!clip_devs) { 482 atm_return(vcc, skb->truesize); 483 kfree_skb(skb); 484 } else { 485 struct net_device *dev = skb->dev; 486 unsigned int len = skb->len; 487 488 skb_get(skb); 489 clip_push(vcc, skb); 490 dev->stats.rx_packets--; 491 dev->stats.rx_bytes -= len; 492 kfree_skb(skb); 493 } 494 } 495 return 0; 496 } 497 498 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 499 { 500 struct neighbour *neigh; 501 struct atmarp_entry *entry; 502 int error; 503 struct clip_vcc *clip_vcc; 504 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; 505 struct rtable *rt; 506 507 if (vcc->push != clip_push) { 508 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); 509 return -EBADF; 510 } 511 clip_vcc = CLIP_VCC(vcc); 512 if (!ip) { 513 if (!clip_vcc->entry) { 514 printk(KERN_ERR "hiding hidden ATMARP entry\n"); 515 return 0; 516 } 517 pr_debug("setentry: remove\n"); 518 unlink_clip_vcc(clip_vcc); 519 return 0; 520 } 521 error = ip_route_output_key(&init_net, &rt, &fl); 522 if (error) 523 return error; 524 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); 525 ip_rt_put(rt); 526 if (!neigh) 527 return -ENOMEM; 528 entry = NEIGH2ENTRY(neigh); 529 if (entry != clip_vcc->entry) { 530 if (!clip_vcc->entry) 531 pr_debug("setentry: add\n"); 532 else { 533 pr_debug("setentry: update\n"); 534 unlink_clip_vcc(clip_vcc); 535 } 536 link_vcc(clip_vcc, entry); 537 } 538 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 539 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); 540 neigh_release(neigh); 541 return error; 542 } 543 544 static const struct net_device_ops clip_netdev_ops = { 545 .ndo_start_xmit = clip_start_xmit, 546 }; 547 548 static void clip_setup(struct net_device *dev) 549 { 550 dev->netdev_ops = &clip_netdev_ops; 551 dev->type = ARPHRD_ATM; 552 dev->hard_header_len = RFC1483LLC_LEN; 553 dev->mtu = RFC1626_MTU; 554 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 555 /* When using a "real" qdisc, the qdisc determines the queue */ 556 /* length. tx_queue_len is only used for the default case, */ 557 /* without any more elaborate queuing. 100 is a reasonable */ 558 /* compromise between decent burst-tolerance and protection */ 559 /* against memory hogs. */ 560 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 561 } 562 563 static int clip_create(int number) 564 { 565 struct net_device *dev; 566 struct clip_priv *clip_priv; 567 int error; 568 569 if (number != -1) { 570 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 571 if (PRIV(dev)->number == number) 572 return -EEXIST; 573 } else { 574 number = 0; 575 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 576 if (PRIV(dev)->number >= number) 577 number = PRIV(dev)->number + 1; 578 } 579 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 580 if (!dev) 581 return -ENOMEM; 582 clip_priv = PRIV(dev); 583 sprintf(dev->name, "atm%d", number); 584 spin_lock_init(&clip_priv->xoff_lock); 585 clip_priv->number = number; 586 error = register_netdev(dev); 587 if (error) { 588 free_netdev(dev); 589 return error; 590 } 591 clip_priv->next = clip_devs; 592 clip_devs = dev; 593 pr_debug("registered (net:%s)\n", dev->name); 594 return number; 595 } 596 597 static int clip_device_event(struct notifier_block *this, unsigned long event, 598 void *arg) 599 { 600 struct net_device *dev = arg; 601 602 if (!net_eq(dev_net(dev), &init_net)) 603 return NOTIFY_DONE; 604 605 if (event == NETDEV_UNREGISTER) { 606 neigh_ifdown(&clip_tbl, dev); 607 return NOTIFY_DONE; 608 } 609 610 /* ignore non-CLIP devices */ 611 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) 612 return NOTIFY_DONE; 613 614 switch (event) { 615 case NETDEV_UP: 616 pr_debug("clip_device_event NETDEV_UP\n"); 617 to_atmarpd(act_up, PRIV(dev)->number, 0); 618 break; 619 case NETDEV_GOING_DOWN: 620 pr_debug("clip_device_event NETDEV_DOWN\n"); 621 to_atmarpd(act_down, PRIV(dev)->number, 0); 622 break; 623 case NETDEV_CHANGE: 624 case NETDEV_CHANGEMTU: 625 pr_debug("clip_device_event NETDEV_CHANGE*\n"); 626 to_atmarpd(act_change, PRIV(dev)->number, 0); 627 break; 628 } 629 return NOTIFY_DONE; 630 } 631 632 static int clip_inet_event(struct notifier_block *this, unsigned long event, 633 void *ifa) 634 { 635 struct in_device *in_dev; 636 637 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 638 /* 639 * Transitions are of the down-change-up type, so it's sufficient to 640 * handle the change on up. 641 */ 642 if (event != NETDEV_UP) 643 return NOTIFY_DONE; 644 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); 645 } 646 647 648 static struct notifier_block clip_dev_notifier = { 649 .notifier_call = clip_device_event, 650 }; 651 652 653 654 static struct notifier_block clip_inet_notifier = { 655 .notifier_call = clip_inet_event, 656 }; 657 658 659 660 static void atmarpd_close(struct atm_vcc *vcc) 661 { 662 pr_debug("atmarpd_close\n"); 663 664 rtnl_lock(); 665 atmarpd = NULL; 666 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 667 rtnl_unlock(); 668 669 pr_debug("(done)\n"); 670 module_put(THIS_MODULE); 671 } 672 673 674 static struct atmdev_ops atmarpd_dev_ops = { 675 .close = atmarpd_close 676 }; 677 678 679 static struct atm_dev atmarpd_dev = { 680 .ops = &atmarpd_dev_ops, 681 .type = "arpd", 682 .number = 999, 683 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) 684 }; 685 686 687 static int atm_init_atmarp(struct atm_vcc *vcc) 688 { 689 rtnl_lock(); 690 if (atmarpd) { 691 rtnl_unlock(); 692 return -EADDRINUSE; 693 } 694 695 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); 696 697 atmarpd = vcc; 698 set_bit(ATM_VF_META,&vcc->flags); 699 set_bit(ATM_VF_READY,&vcc->flags); 700 /* allow replies and avoid getting closed if signaling dies */ 701 vcc->dev = &atmarpd_dev; 702 vcc_insert_socket(sk_atm(vcc)); 703 vcc->push = NULL; 704 vcc->pop = NULL; /* crash */ 705 vcc->push_oam = NULL; /* crash */ 706 rtnl_unlock(); 707 return 0; 708 } 709 710 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 711 { 712 struct atm_vcc *vcc = ATM_SD(sock); 713 int err = 0; 714 715 switch (cmd) { 716 case SIOCMKCLIP: 717 case ATMARPD_CTRL: 718 case ATMARP_MKIP: 719 case ATMARP_SETENTRY: 720 case ATMARP_ENCAP: 721 if (!capable(CAP_NET_ADMIN)) 722 return -EPERM; 723 break; 724 default: 725 return -ENOIOCTLCMD; 726 } 727 728 switch (cmd) { 729 case SIOCMKCLIP: 730 err = clip_create(arg); 731 break; 732 case ATMARPD_CTRL: 733 err = atm_init_atmarp(vcc); 734 if (!err) { 735 sock->state = SS_CONNECTED; 736 __module_get(THIS_MODULE); 737 } 738 break; 739 case ATMARP_MKIP: 740 err = clip_mkip(vcc, arg); 741 break; 742 case ATMARP_SETENTRY: 743 err = clip_setentry(vcc, (__force __be32)arg); 744 break; 745 case ATMARP_ENCAP: 746 err = clip_encap(vcc, arg); 747 break; 748 } 749 return err; 750 } 751 752 static struct atm_ioctl clip_ioctl_ops = { 753 .owner = THIS_MODULE, 754 .ioctl = clip_ioctl, 755 }; 756 757 #ifdef CONFIG_PROC_FS 758 759 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 760 { 761 static int code[] = { 1, 2, 10, 6, 1, 0 }; 762 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 763 764 if (*addr->sas_addr.pub) { 765 seq_printf(seq, "%s", addr->sas_addr.pub); 766 if (*addr->sas_addr.prv) 767 seq_putc(seq, '+'); 768 } else if (!*addr->sas_addr.prv) { 769 seq_printf(seq, "%s", "(none)"); 770 return; 771 } 772 if (*addr->sas_addr.prv) { 773 unsigned char *prv = addr->sas_addr.prv; 774 int *fields; 775 int i, j; 776 777 fields = *prv == ATM_AFI_E164 ? e164 : code; 778 for (i = 0; fields[i]; i++) { 779 for (j = fields[i]; j; j--) 780 seq_printf(seq, "%02X", *prv++); 781 if (fields[i + 1]) 782 seq_putc(seq, '.'); 783 } 784 } 785 } 786 787 /* This means the neighbour entry has no attached VCC objects. */ 788 #define SEQ_NO_VCC_TOKEN ((void *) 2) 789 790 static void atmarp_info(struct seq_file *seq, struct net_device *dev, 791 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 792 { 793 unsigned long exp; 794 char buf[17]; 795 int svc, llc, off; 796 797 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 798 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 799 800 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 801 802 if (clip_vcc == SEQ_NO_VCC_TOKEN) 803 exp = entry->neigh->used; 804 else 805 exp = clip_vcc->last_use; 806 807 exp = (jiffies - exp) / HZ; 808 809 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 810 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 811 812 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", 813 &entry->ip); 814 while (off < 16) 815 buf[off++] = ' '; 816 buf[off] = '\0'; 817 seq_printf(seq, "%s", buf); 818 819 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 820 if (time_before(jiffies, entry->expires)) 821 seq_printf(seq, "(resolving)\n"); 822 else 823 seq_printf(seq, "(expired, ref %d)\n", 824 atomic_read(&entry->neigh->refcnt)); 825 } else if (!svc) { 826 seq_printf(seq, "%d.%d.%d\n", 827 clip_vcc->vcc->dev->number, 828 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 829 } else { 830 svc_addr(seq, &clip_vcc->vcc->remote); 831 seq_putc(seq, '\n'); 832 } 833 } 834 835 struct clip_seq_state { 836 /* This member must be first. */ 837 struct neigh_seq_state ns; 838 839 /* Local to clip specific iteration. */ 840 struct clip_vcc *vcc; 841 }; 842 843 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 844 struct clip_vcc *curr) 845 { 846 if (!curr) { 847 curr = e->vccs; 848 if (!curr) 849 return SEQ_NO_VCC_TOKEN; 850 return curr; 851 } 852 if (curr == SEQ_NO_VCC_TOKEN) 853 return NULL; 854 855 curr = curr->next; 856 857 return curr; 858 } 859 860 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 861 struct atmarp_entry *e, loff_t * pos) 862 { 863 struct clip_vcc *vcc = state->vcc; 864 865 vcc = clip_seq_next_vcc(e, vcc); 866 if (vcc && pos != NULL) { 867 while (*pos) { 868 vcc = clip_seq_next_vcc(e, vcc); 869 if (!vcc) 870 break; 871 --(*pos); 872 } 873 } 874 state->vcc = vcc; 875 876 return vcc; 877 } 878 879 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 880 struct neighbour *n, loff_t * pos) 881 { 882 struct clip_seq_state *state = (struct clip_seq_state *)_state; 883 884 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); 885 } 886 887 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 888 { 889 struct clip_seq_state *state = seq->private; 890 state->ns.neigh_sub_iter = clip_seq_sub_iter; 891 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); 892 } 893 894 static int clip_seq_show(struct seq_file *seq, void *v) 895 { 896 static char atm_arp_banner[] = 897 "IPitf TypeEncp Idle IP address ATM address\n"; 898 899 if (v == SEQ_START_TOKEN) { 900 seq_puts(seq, atm_arp_banner); 901 } else { 902 struct clip_seq_state *state = seq->private; 903 struct neighbour *n = v; 904 struct clip_vcc *vcc = state->vcc; 905 906 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); 907 } 908 return 0; 909 } 910 911 static const struct seq_operations arp_seq_ops = { 912 .start = clip_seq_start, 913 .next = neigh_seq_next, 914 .stop = neigh_seq_stop, 915 .show = clip_seq_show, 916 }; 917 918 static int arp_seq_open(struct inode *inode, struct file *file) 919 { 920 return seq_open_net(inode, file, &arp_seq_ops, 921 sizeof(struct clip_seq_state)); 922 } 923 924 static const struct file_operations arp_seq_fops = { 925 .open = arp_seq_open, 926 .read = seq_read, 927 .llseek = seq_lseek, 928 .release = seq_release_net, 929 .owner = THIS_MODULE 930 }; 931 #endif 932 933 static void atm_clip_exit_noproc(void); 934 935 static int __init atm_clip_init(void) 936 { 937 neigh_table_init_no_netlink(&clip_tbl); 938 939 clip_tbl_hook = &clip_tbl; 940 register_atm_ioctl(&clip_ioctl_ops); 941 register_netdevice_notifier(&clip_dev_notifier); 942 register_inetaddr_notifier(&clip_inet_notifier); 943 944 setup_timer(&idle_timer, idle_timer_check, 0); 945 946 #ifdef CONFIG_PROC_FS 947 { 948 struct proc_dir_entry *p; 949 950 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); 951 if (!p) { 952 printk(KERN_ERR "Unable to initialize " 953 "/proc/net/atm/arp\n"); 954 atm_clip_exit_noproc(); 955 return -ENOMEM; 956 } 957 } 958 #endif 959 960 return 0; 961 } 962 963 static void atm_clip_exit_noproc(void) 964 { 965 struct net_device *dev, *next; 966 967 unregister_inetaddr_notifier(&clip_inet_notifier); 968 unregister_netdevice_notifier(&clip_dev_notifier); 969 970 deregister_atm_ioctl(&clip_ioctl_ops); 971 972 /* First, stop the idle timer, so it stops banging 973 * on the table. 974 */ 975 del_timer_sync(&idle_timer); 976 977 /* Next, purge the table, so that the device 978 * unregister loop below does not hang due to 979 * device references remaining in the table. 980 */ 981 neigh_ifdown(&clip_tbl, NULL); 982 983 dev = clip_devs; 984 while (dev) { 985 next = PRIV(dev)->next; 986 unregister_netdev(dev); 987 free_netdev(dev); 988 dev = next; 989 } 990 991 /* Now it is safe to fully shutdown whole table. */ 992 neigh_table_clear(&clip_tbl); 993 994 clip_tbl_hook = NULL; 995 } 996 997 static void __exit atm_clip_exit(void) 998 { 999 remove_proc_entry("arp", atm_proc_root); 1000 1001 atm_clip_exit_noproc(); 1002 } 1003 1004 module_init(atm_clip_init); 1005 module_exit(atm_clip_exit); 1006 MODULE_AUTHOR("Werner Almesberger"); 1007 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 1008 MODULE_LICENSE("GPL"); 1009