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) { 373 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); 374 dev_kfree_skb(skb); 375 dev->stats.tx_dropped++; 376 return 0; 377 } 378 if (!skb->dst->neighbour) { 379 #if 0 380 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); 381 if (!skb->dst->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->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->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 clip_vcc *clip_vcc; 449 struct sk_buff *skb; 450 struct sk_buff_head *rq; 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 rq = &sk_atm(vcc)->sk_receive_queue; 473 474 spin_lock_irqsave(&rq->lock, flags); 475 if (skb_queue_empty(rq)) { 476 skb = NULL; 477 } else { 478 /* NULL terminate the list. */ 479 rq->prev->next = NULL; 480 skb = rq->next; 481 } 482 rq->prev = rq->next = (struct sk_buff *)rq; 483 rq->qlen = 0; 484 spin_unlock_irqrestore(&rq->lock, flags); 485 486 /* re-process everything received between connection setup and MKIP */ 487 while (skb) { 488 struct sk_buff *next = skb->next; 489 490 skb->next = skb->prev = NULL; 491 if (!clip_devs) { 492 atm_return(vcc, skb->truesize); 493 kfree_skb(skb); 494 } else { 495 unsigned int len = skb->len; 496 497 skb_get(skb); 498 clip_push(vcc, skb); 499 skb->dev->stats.rx_packets--; 500 skb->dev->stats.rx_bytes -= len; 501 kfree_skb(skb); 502 } 503 504 skb = next; 505 } 506 return 0; 507 } 508 509 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 510 { 511 struct neighbour *neigh; 512 struct atmarp_entry *entry; 513 int error; 514 struct clip_vcc *clip_vcc; 515 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; 516 struct rtable *rt; 517 518 if (vcc->push != clip_push) { 519 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); 520 return -EBADF; 521 } 522 clip_vcc = CLIP_VCC(vcc); 523 if (!ip) { 524 if (!clip_vcc->entry) { 525 printk(KERN_ERR "hiding hidden ATMARP entry\n"); 526 return 0; 527 } 528 pr_debug("setentry: remove\n"); 529 unlink_clip_vcc(clip_vcc); 530 return 0; 531 } 532 error = ip_route_output_key(&init_net, &rt, &fl); 533 if (error) 534 return error; 535 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); 536 ip_rt_put(rt); 537 if (!neigh) 538 return -ENOMEM; 539 entry = NEIGH2ENTRY(neigh); 540 if (entry != clip_vcc->entry) { 541 if (!clip_vcc->entry) 542 pr_debug("setentry: add\n"); 543 else { 544 pr_debug("setentry: update\n"); 545 unlink_clip_vcc(clip_vcc); 546 } 547 link_vcc(clip_vcc, entry); 548 } 549 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 550 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); 551 neigh_release(neigh); 552 return error; 553 } 554 555 static const struct net_device_ops clip_netdev_ops = { 556 .ndo_start_xmit = clip_start_xmit, 557 }; 558 559 static void clip_setup(struct net_device *dev) 560 { 561 dev->netdev_ops = &clip_netdev_ops; 562 dev->type = ARPHRD_ATM; 563 dev->hard_header_len = RFC1483LLC_LEN; 564 dev->mtu = RFC1626_MTU; 565 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 566 /* When using a "real" qdisc, the qdisc determines the queue */ 567 /* length. tx_queue_len is only used for the default case, */ 568 /* without any more elaborate queuing. 100 is a reasonable */ 569 /* compromise between decent burst-tolerance and protection */ 570 /* against memory hogs. */ 571 } 572 573 static int clip_create(int number) 574 { 575 struct net_device *dev; 576 struct clip_priv *clip_priv; 577 int error; 578 579 if (number != -1) { 580 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 581 if (PRIV(dev)->number == number) 582 return -EEXIST; 583 } else { 584 number = 0; 585 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 586 if (PRIV(dev)->number >= number) 587 number = PRIV(dev)->number + 1; 588 } 589 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 590 if (!dev) 591 return -ENOMEM; 592 clip_priv = PRIV(dev); 593 sprintf(dev->name, "atm%d", number); 594 spin_lock_init(&clip_priv->xoff_lock); 595 clip_priv->number = number; 596 error = register_netdev(dev); 597 if (error) { 598 free_netdev(dev); 599 return error; 600 } 601 clip_priv->next = clip_devs; 602 clip_devs = dev; 603 pr_debug("registered (net:%s)\n", dev->name); 604 return number; 605 } 606 607 static int clip_device_event(struct notifier_block *this, unsigned long event, 608 void *arg) 609 { 610 struct net_device *dev = arg; 611 612 if (!net_eq(dev_net(dev), &init_net)) 613 return NOTIFY_DONE; 614 615 if (event == NETDEV_UNREGISTER) { 616 neigh_ifdown(&clip_tbl, dev); 617 return NOTIFY_DONE; 618 } 619 620 /* ignore non-CLIP devices */ 621 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) 622 return NOTIFY_DONE; 623 624 switch (event) { 625 case NETDEV_UP: 626 pr_debug("clip_device_event NETDEV_UP\n"); 627 to_atmarpd(act_up, PRIV(dev)->number, 0); 628 break; 629 case NETDEV_GOING_DOWN: 630 pr_debug("clip_device_event NETDEV_DOWN\n"); 631 to_atmarpd(act_down, PRIV(dev)->number, 0); 632 break; 633 case NETDEV_CHANGE: 634 case NETDEV_CHANGEMTU: 635 pr_debug("clip_device_event NETDEV_CHANGE*\n"); 636 to_atmarpd(act_change, PRIV(dev)->number, 0); 637 break; 638 } 639 return NOTIFY_DONE; 640 } 641 642 static int clip_inet_event(struct notifier_block *this, unsigned long event, 643 void *ifa) 644 { 645 struct in_device *in_dev; 646 647 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 648 /* 649 * Transitions are of the down-change-up type, so it's sufficient to 650 * handle the change on up. 651 */ 652 if (event != NETDEV_UP) 653 return NOTIFY_DONE; 654 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); 655 } 656 657 658 static struct notifier_block clip_dev_notifier = { 659 .notifier_call = clip_device_event, 660 }; 661 662 663 664 static struct notifier_block clip_inet_notifier = { 665 .notifier_call = clip_inet_event, 666 }; 667 668 669 670 static void atmarpd_close(struct atm_vcc *vcc) 671 { 672 pr_debug("atmarpd_close\n"); 673 674 rtnl_lock(); 675 atmarpd = NULL; 676 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 677 rtnl_unlock(); 678 679 pr_debug("(done)\n"); 680 module_put(THIS_MODULE); 681 } 682 683 684 static struct atmdev_ops atmarpd_dev_ops = { 685 .close = atmarpd_close 686 }; 687 688 689 static struct atm_dev atmarpd_dev = { 690 .ops = &atmarpd_dev_ops, 691 .type = "arpd", 692 .number = 999, 693 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) 694 }; 695 696 697 static int atm_init_atmarp(struct atm_vcc *vcc) 698 { 699 rtnl_lock(); 700 if (atmarpd) { 701 rtnl_unlock(); 702 return -EADDRINUSE; 703 } 704 705 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); 706 707 atmarpd = vcc; 708 set_bit(ATM_VF_META,&vcc->flags); 709 set_bit(ATM_VF_READY,&vcc->flags); 710 /* allow replies and avoid getting closed if signaling dies */ 711 vcc->dev = &atmarpd_dev; 712 vcc_insert_socket(sk_atm(vcc)); 713 vcc->push = NULL; 714 vcc->pop = NULL; /* crash */ 715 vcc->push_oam = NULL; /* crash */ 716 rtnl_unlock(); 717 return 0; 718 } 719 720 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 721 { 722 struct atm_vcc *vcc = ATM_SD(sock); 723 int err = 0; 724 725 switch (cmd) { 726 case SIOCMKCLIP: 727 case ATMARPD_CTRL: 728 case ATMARP_MKIP: 729 case ATMARP_SETENTRY: 730 case ATMARP_ENCAP: 731 if (!capable(CAP_NET_ADMIN)) 732 return -EPERM; 733 break; 734 default: 735 return -ENOIOCTLCMD; 736 } 737 738 switch (cmd) { 739 case SIOCMKCLIP: 740 err = clip_create(arg); 741 break; 742 case ATMARPD_CTRL: 743 err = atm_init_atmarp(vcc); 744 if (!err) { 745 sock->state = SS_CONNECTED; 746 __module_get(THIS_MODULE); 747 } 748 break; 749 case ATMARP_MKIP: 750 err = clip_mkip(vcc, arg); 751 break; 752 case ATMARP_SETENTRY: 753 err = clip_setentry(vcc, (__force __be32)arg); 754 break; 755 case ATMARP_ENCAP: 756 err = clip_encap(vcc, arg); 757 break; 758 } 759 return err; 760 } 761 762 static struct atm_ioctl clip_ioctl_ops = { 763 .owner = THIS_MODULE, 764 .ioctl = clip_ioctl, 765 }; 766 767 #ifdef CONFIG_PROC_FS 768 769 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 770 { 771 static int code[] = { 1, 2, 10, 6, 1, 0 }; 772 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 773 774 if (*addr->sas_addr.pub) { 775 seq_printf(seq, "%s", addr->sas_addr.pub); 776 if (*addr->sas_addr.prv) 777 seq_putc(seq, '+'); 778 } else if (!*addr->sas_addr.prv) { 779 seq_printf(seq, "%s", "(none)"); 780 return; 781 } 782 if (*addr->sas_addr.prv) { 783 unsigned char *prv = addr->sas_addr.prv; 784 int *fields; 785 int i, j; 786 787 fields = *prv == ATM_AFI_E164 ? e164 : code; 788 for (i = 0; fields[i]; i++) { 789 for (j = fields[i]; j; j--) 790 seq_printf(seq, "%02X", *prv++); 791 if (fields[i + 1]) 792 seq_putc(seq, '.'); 793 } 794 } 795 } 796 797 /* This means the neighbour entry has no attached VCC objects. */ 798 #define SEQ_NO_VCC_TOKEN ((void *) 2) 799 800 static void atmarp_info(struct seq_file *seq, struct net_device *dev, 801 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 802 { 803 unsigned long exp; 804 char buf[17]; 805 int svc, llc, off; 806 807 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 808 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 809 810 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 811 812 if (clip_vcc == SEQ_NO_VCC_TOKEN) 813 exp = entry->neigh->used; 814 else 815 exp = clip_vcc->last_use; 816 817 exp = (jiffies - exp) / HZ; 818 819 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 820 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 821 822 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", 823 &entry->ip); 824 while (off < 16) 825 buf[off++] = ' '; 826 buf[off] = '\0'; 827 seq_printf(seq, "%s", buf); 828 829 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 830 if (time_before(jiffies, entry->expires)) 831 seq_printf(seq, "(resolving)\n"); 832 else 833 seq_printf(seq, "(expired, ref %d)\n", 834 atomic_read(&entry->neigh->refcnt)); 835 } else if (!svc) { 836 seq_printf(seq, "%d.%d.%d\n", 837 clip_vcc->vcc->dev->number, 838 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 839 } else { 840 svc_addr(seq, &clip_vcc->vcc->remote); 841 seq_putc(seq, '\n'); 842 } 843 } 844 845 struct clip_seq_state { 846 /* This member must be first. */ 847 struct neigh_seq_state ns; 848 849 /* Local to clip specific iteration. */ 850 struct clip_vcc *vcc; 851 }; 852 853 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 854 struct clip_vcc *curr) 855 { 856 if (!curr) { 857 curr = e->vccs; 858 if (!curr) 859 return SEQ_NO_VCC_TOKEN; 860 return curr; 861 } 862 if (curr == SEQ_NO_VCC_TOKEN) 863 return NULL; 864 865 curr = curr->next; 866 867 return curr; 868 } 869 870 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 871 struct atmarp_entry *e, loff_t * pos) 872 { 873 struct clip_vcc *vcc = state->vcc; 874 875 vcc = clip_seq_next_vcc(e, vcc); 876 if (vcc && pos != NULL) { 877 while (*pos) { 878 vcc = clip_seq_next_vcc(e, vcc); 879 if (!vcc) 880 break; 881 --(*pos); 882 } 883 } 884 state->vcc = vcc; 885 886 return vcc; 887 } 888 889 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 890 struct neighbour *n, loff_t * pos) 891 { 892 struct clip_seq_state *state = (struct clip_seq_state *)_state; 893 894 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); 895 } 896 897 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 898 { 899 struct clip_seq_state *state = seq->private; 900 state->ns.neigh_sub_iter = clip_seq_sub_iter; 901 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); 902 } 903 904 static int clip_seq_show(struct seq_file *seq, void *v) 905 { 906 static char atm_arp_banner[] = 907 "IPitf TypeEncp Idle IP address ATM address\n"; 908 909 if (v == SEQ_START_TOKEN) { 910 seq_puts(seq, atm_arp_banner); 911 } else { 912 struct clip_seq_state *state = seq->private; 913 struct neighbour *n = v; 914 struct clip_vcc *vcc = state->vcc; 915 916 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); 917 } 918 return 0; 919 } 920 921 static const struct seq_operations arp_seq_ops = { 922 .start = clip_seq_start, 923 .next = neigh_seq_next, 924 .stop = neigh_seq_stop, 925 .show = clip_seq_show, 926 }; 927 928 static int arp_seq_open(struct inode *inode, struct file *file) 929 { 930 return seq_open_net(inode, file, &arp_seq_ops, 931 sizeof(struct clip_seq_state)); 932 } 933 934 static const struct file_operations arp_seq_fops = { 935 .open = arp_seq_open, 936 .read = seq_read, 937 .llseek = seq_lseek, 938 .release = seq_release_net, 939 .owner = THIS_MODULE 940 }; 941 #endif 942 943 static void atm_clip_exit_noproc(void); 944 945 static int __init atm_clip_init(void) 946 { 947 neigh_table_init_no_netlink(&clip_tbl); 948 949 clip_tbl_hook = &clip_tbl; 950 register_atm_ioctl(&clip_ioctl_ops); 951 register_netdevice_notifier(&clip_dev_notifier); 952 register_inetaddr_notifier(&clip_inet_notifier); 953 954 setup_timer(&idle_timer, idle_timer_check, 0); 955 956 #ifdef CONFIG_PROC_FS 957 { 958 struct proc_dir_entry *p; 959 960 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); 961 if (!p) { 962 printk(KERN_ERR "Unable to initialize " 963 "/proc/net/atm/arp\n"); 964 atm_clip_exit_noproc(); 965 return -ENOMEM; 966 } 967 } 968 #endif 969 970 return 0; 971 } 972 973 static void atm_clip_exit_noproc(void) 974 { 975 struct net_device *dev, *next; 976 977 unregister_inetaddr_notifier(&clip_inet_notifier); 978 unregister_netdevice_notifier(&clip_dev_notifier); 979 980 deregister_atm_ioctl(&clip_ioctl_ops); 981 982 /* First, stop the idle timer, so it stops banging 983 * on the table. 984 */ 985 del_timer_sync(&idle_timer); 986 987 /* Next, purge the table, so that the device 988 * unregister loop below does not hang due to 989 * device references remaining in the table. 990 */ 991 neigh_ifdown(&clip_tbl, NULL); 992 993 dev = clip_devs; 994 while (dev) { 995 next = PRIV(dev)->next; 996 unregister_netdev(dev); 997 free_netdev(dev); 998 dev = next; 999 } 1000 1001 /* Now it is safe to fully shutdown whole table. */ 1002 neigh_table_clear(&clip_tbl); 1003 1004 clip_tbl_hook = NULL; 1005 } 1006 1007 static void __exit atm_clip_exit(void) 1008 { 1009 remove_proc_entry("arp", atm_proc_root); 1010 1011 atm_clip_exit_noproc(); 1012 } 1013 1014 module_init(atm_clip_init); 1015 module_exit(atm_clip_exit); 1016 MODULE_AUTHOR("Werner Almesberger"); 1017 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 1018 MODULE_LICENSE("GPL"); 1019