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 44 #if 0 45 #define DPRINTK(format,args...) printk(format,##args) 46 #else 47 #define DPRINTK(format,args...) 48 #endif 49 50 51 static struct net_device *clip_devs; 52 static struct atm_vcc *atmarpd; 53 static struct neigh_table clip_tbl; 54 static struct timer_list idle_timer; 55 56 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) 57 { 58 struct sock *sk; 59 struct atmarp_ctrl *ctrl; 60 struct sk_buff *skb; 61 62 DPRINTK("to_atmarpd(%d)\n", type); 63 if (!atmarpd) 64 return -EUNATCH; 65 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); 66 if (!skb) 67 return -ENOMEM; 68 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); 69 ctrl->type = type; 70 ctrl->itf_num = itf; 71 ctrl->ip = ip; 72 atm_force_charge(atmarpd, skb->truesize); 73 74 sk = sk_atm(atmarpd); 75 skb_queue_tail(&sk->sk_receive_queue, skb); 76 sk->sk_data_ready(sk, skb->len); 77 return 0; 78 } 79 80 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) 81 { 82 DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, 83 entry->neigh); 84 clip_vcc->entry = entry; 85 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 86 clip_vcc->next = entry->vccs; 87 entry->vccs = clip_vcc; 88 entry->neigh->used = jiffies; 89 } 90 91 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 92 { 93 struct atmarp_entry *entry = clip_vcc->entry; 94 struct clip_vcc **walk; 95 96 if (!entry) { 97 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); 98 return; 99 } 100 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ 101 entry->neigh->used = jiffies; 102 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 103 if (*walk == clip_vcc) { 104 int error; 105 106 *walk = clip_vcc->next; /* atomic */ 107 clip_vcc->entry = NULL; 108 if (clip_vcc->xoff) 109 netif_wake_queue(entry->neigh->dev); 110 if (entry->vccs) 111 goto out; 112 entry->expires = jiffies - 1; 113 /* force resolution or expiration */ 114 error = neigh_update(entry->neigh, NULL, NUD_NONE, 115 NEIGH_UPDATE_F_ADMIN); 116 if (error) 117 printk(KERN_CRIT "unlink_clip_vcc: " 118 "neigh_update failed with %d\n", error); 119 goto out; 120 } 121 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " 122 "0x%p)\n", entry, clip_vcc); 123 out: 124 netif_tx_unlock_bh(entry->neigh->dev); 125 } 126 127 /* The neighbour entry n->lock is held. */ 128 static int neigh_check_cb(struct neighbour *n) 129 { 130 struct atmarp_entry *entry = NEIGH2ENTRY(n); 131 struct clip_vcc *cv; 132 133 for (cv = entry->vccs; cv; cv = cv->next) { 134 unsigned long exp = cv->last_use + cv->idle_timeout; 135 136 if (cv->idle_timeout && time_after(jiffies, exp)) { 137 DPRINTK("releasing vcc %p->%p of entry %p\n", 138 cv, cv->vcc, entry); 139 vcc_release_async(cv->vcc, -ETIMEDOUT); 140 } 141 } 142 143 if (entry->vccs || time_before(jiffies, entry->expires)) 144 return 0; 145 146 if (atomic_read(&n->refcnt) > 1) { 147 struct sk_buff *skb; 148 149 DPRINTK("destruction postponed with ref %d\n", 150 atomic_read(&n->refcnt)); 151 152 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 153 dev_kfree_skb(skb); 154 155 return 0; 156 } 157 158 DPRINTK("expired neigh %p\n", n); 159 return 1; 160 } 161 162 static void idle_timer_check(unsigned long dummy) 163 { 164 write_lock(&clip_tbl.lock); 165 __neigh_for_each_release(&clip_tbl, neigh_check_cb); 166 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 167 write_unlock(&clip_tbl.lock); 168 } 169 170 static int clip_arp_rcv(struct sk_buff *skb) 171 { 172 struct atm_vcc *vcc; 173 174 DPRINTK("clip_arp_rcv\n"); 175 vcc = ATM_SKB(skb)->vcc; 176 if (!vcc || !atm_charge(vcc, skb->truesize)) { 177 dev_kfree_skb_any(skb); 178 return 0; 179 } 180 DPRINTK("pushing to %p\n", vcc); 181 DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push); 182 CLIP_VCC(vcc)->old_push(vcc, skb); 183 return 0; 184 } 185 186 static const unsigned char llc_oui[] = { 187 0xaa, /* DSAP: non-ISO */ 188 0xaa, /* SSAP: non-ISO */ 189 0x03, /* Ctrl: Unnumbered Information Command PDU */ 190 0x00, /* OUI: EtherType */ 191 0x00, 192 0x00 193 }; 194 195 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) 196 { 197 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 198 199 DPRINTK("clip push\n"); 200 if (!skb) { 201 DPRINTK("removing VCC %p\n", clip_vcc); 202 if (clip_vcc->entry) 203 unlink_clip_vcc(clip_vcc); 204 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ 205 kfree(clip_vcc); 206 return; 207 } 208 atm_return(vcc, skb->truesize); 209 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; 210 /* clip_vcc->entry == NULL if we don't have an IP address yet */ 211 if (!skb->dev) { 212 dev_kfree_skb_any(skb); 213 return; 214 } 215 ATM_SKB(skb)->vcc = vcc; 216 skb->mac.raw = skb->data; 217 if (!clip_vcc->encap 218 || skb->len < RFC1483LLC_LEN 219 || memcmp(skb->data, llc_oui, sizeof (llc_oui))) 220 skb->protocol = htons(ETH_P_IP); 221 else { 222 skb->protocol = ((__be16 *) skb->data)[3]; 223 skb_pull(skb, RFC1483LLC_LEN); 224 if (skb->protocol == htons(ETH_P_ARP)) { 225 PRIV(skb->dev)->stats.rx_packets++; 226 PRIV(skb->dev)->stats.rx_bytes += skb->len; 227 clip_arp_rcv(skb); 228 return; 229 } 230 } 231 clip_vcc->last_use = jiffies; 232 PRIV(skb->dev)->stats.rx_packets++; 233 PRIV(skb->dev)->stats.rx_bytes += skb->len; 234 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 235 netif_rx(skb); 236 } 237 238 /* 239 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that 240 * clip_pop is atomic with respect to the critical section in clip_start_xmit. 241 */ 242 243 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) 244 { 245 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 246 struct net_device *dev = skb->dev; 247 int old; 248 unsigned long flags; 249 250 DPRINTK("clip_pop(vcc %p)\n", vcc); 251 clip_vcc->old_pop(vcc, skb); 252 /* skb->dev == NULL in outbound ARP packets */ 253 if (!dev) 254 return; 255 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); 256 if (atm_may_send(vcc, 0)) { 257 old = xchg(&clip_vcc->xoff, 0); 258 if (old) 259 netif_wake_queue(dev); 260 } 261 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); 262 } 263 264 static void clip_neigh_destroy(struct neighbour *neigh) 265 { 266 DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh); 267 if (NEIGH2ENTRY(neigh)->vccs) 268 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n"); 269 NEIGH2ENTRY(neigh)->vccs = (void *) NEIGHBOR_DEAD; 270 } 271 272 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) 273 { 274 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); 275 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); 276 } 277 278 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) 279 { 280 #ifndef CONFIG_ATM_CLIP_NO_ICMP 281 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 282 #endif 283 kfree_skb(skb); 284 } 285 286 static struct neigh_ops clip_neigh_ops = { 287 .family = AF_INET, 288 .solicit = clip_neigh_solicit, 289 .error_report = clip_neigh_error, 290 .output = dev_queue_xmit, 291 .connected_output = dev_queue_xmit, 292 .hh_output = dev_queue_xmit, 293 .queue_xmit = dev_queue_xmit, 294 }; 295 296 static int clip_constructor(struct neighbour *neigh) 297 { 298 struct atmarp_entry *entry = NEIGH2ENTRY(neigh); 299 struct net_device *dev = neigh->dev; 300 struct in_device *in_dev; 301 struct neigh_parms *parms; 302 303 DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry); 304 neigh->type = inet_addr_type(entry->ip); 305 if (neigh->type != RTN_UNICAST) 306 return -EINVAL; 307 308 rcu_read_lock(); 309 in_dev = __in_dev_get_rcu(dev); 310 if (!in_dev) { 311 rcu_read_unlock(); 312 return -EINVAL; 313 } 314 315 parms = in_dev->arp_parms; 316 __neigh_parms_put(neigh->parms); 317 neigh->parms = neigh_parms_clone(parms); 318 rcu_read_unlock(); 319 320 neigh->ops = &clip_neigh_ops; 321 neigh->output = neigh->nud_state & NUD_VALID ? 322 neigh->ops->connected_output : neigh->ops->output; 323 entry->neigh = neigh; 324 entry->vccs = NULL; 325 entry->expires = jiffies - 1; 326 return 0; 327 } 328 329 static u32 clip_hash(const void *pkey, const struct net_device *dev) 330 { 331 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); 332 } 333 334 static struct neigh_table clip_tbl = { 335 .family = AF_INET, 336 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), 337 .key_len = 4, 338 .hash = clip_hash, 339 .constructor = clip_constructor, 340 .id = "clip_arp_cache", 341 342 /* parameters are copied from ARP ... */ 343 .parms = { 344 .tbl = &clip_tbl, 345 .neigh_destructor = clip_neigh_destroy, 346 .base_reachable_time = 30 * HZ, 347 .retrans_time = 1 * HZ, 348 .gc_staletime = 60 * HZ, 349 .reachable_time = 30 * HZ, 350 .delay_probe_time = 5 * HZ, 351 .queue_len = 3, 352 .ucast_probes = 3, 353 .mcast_probes = 3, 354 .anycast_delay = 1 * HZ, 355 .proxy_delay = (8 * HZ) / 10, 356 .proxy_qlen = 64, 357 .locktime = 1 * HZ, 358 }, 359 .gc_interval = 30 * HZ, 360 .gc_thresh1 = 128, 361 .gc_thresh2 = 512, 362 .gc_thresh3 = 1024, 363 }; 364 365 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 366 367 /* 368 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 369 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 370 * don't increment the usage count. This is used to create entries in 371 * clip_setentry. 372 */ 373 374 static int clip_encap(struct atm_vcc *vcc, int mode) 375 { 376 CLIP_VCC(vcc)->encap = mode; 377 return 0; 378 } 379 380 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) 381 { 382 struct clip_priv *clip_priv = PRIV(dev); 383 struct atmarp_entry *entry; 384 struct atm_vcc *vcc; 385 int old; 386 unsigned long flags; 387 388 DPRINTK("clip_start_xmit (skb %p)\n", skb); 389 if (!skb->dst) { 390 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); 391 dev_kfree_skb(skb); 392 clip_priv->stats.tx_dropped++; 393 return 0; 394 } 395 if (!skb->dst->neighbour) { 396 #if 0 397 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); 398 if (!skb->dst->neighbour) { 399 dev_kfree_skb(skb); /* lost that one */ 400 clip_priv->stats.tx_dropped++; 401 return 0; 402 } 403 #endif 404 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); 405 dev_kfree_skb(skb); 406 clip_priv->stats.tx_dropped++; 407 return 0; 408 } 409 entry = NEIGH2ENTRY(skb->dst->neighbour); 410 if (!entry->vccs) { 411 if (time_after(jiffies, entry->expires)) { 412 /* should be resolved */ 413 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 414 to_atmarpd(act_need, PRIV(dev)->number, entry->ip); 415 } 416 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 417 skb_queue_tail(&entry->neigh->arp_queue, skb); 418 else { 419 dev_kfree_skb(skb); 420 clip_priv->stats.tx_dropped++; 421 } 422 return 0; 423 } 424 DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs); 425 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 426 DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); 427 if (entry->vccs->encap) { 428 void *here; 429 430 here = skb_push(skb, RFC1483LLC_LEN); 431 memcpy(here, llc_oui, sizeof(llc_oui)); 432 ((__be16 *) here)[3] = skb->protocol; 433 } 434 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 435 ATM_SKB(skb)->atm_options = vcc->atm_options; 436 entry->vccs->last_use = jiffies; 437 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 438 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 439 if (old) { 440 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); 441 return 0; 442 } 443 clip_priv->stats.tx_packets++; 444 clip_priv->stats.tx_bytes += skb->len; 445 vcc->send(vcc, skb); 446 if (atm_may_send(vcc, 0)) { 447 entry->vccs->xoff = 0; 448 return 0; 449 } 450 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 451 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 452 barrier(); 453 if (!entry->vccs->xoff) 454 netif_start_queue(dev); 455 /* Oh, we just raced with clip_pop. netif_start_queue should be 456 good enough, because nothing should really be asleep because 457 of the brief netif_stop_queue. If this isn't true or if it 458 changes, use netif_wake_queue instead. */ 459 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 460 return 0; 461 } 462 463 static struct net_device_stats *clip_get_stats(struct net_device *dev) 464 { 465 return &PRIV(dev)->stats; 466 } 467 468 static int clip_mkip(struct atm_vcc *vcc, int timeout) 469 { 470 struct clip_vcc *clip_vcc; 471 struct sk_buff *skb; 472 struct sk_buff_head *rq; 473 unsigned long flags; 474 475 if (!vcc->push) 476 return -EBADFD; 477 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); 478 if (!clip_vcc) 479 return -ENOMEM; 480 DPRINTK("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc); 481 clip_vcc->vcc = vcc; 482 vcc->user_back = clip_vcc; 483 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 484 clip_vcc->entry = NULL; 485 clip_vcc->xoff = 0; 486 clip_vcc->encap = 1; 487 clip_vcc->last_use = jiffies; 488 clip_vcc->idle_timeout = timeout * HZ; 489 clip_vcc->old_push = vcc->push; 490 clip_vcc->old_pop = vcc->pop; 491 vcc->push = clip_push; 492 vcc->pop = clip_pop; 493 494 rq = &sk_atm(vcc)->sk_receive_queue; 495 496 spin_lock_irqsave(&rq->lock, flags); 497 if (skb_queue_empty(rq)) { 498 skb = NULL; 499 } else { 500 /* NULL terminate the list. */ 501 rq->prev->next = NULL; 502 skb = rq->next; 503 } 504 rq->prev = rq->next = (struct sk_buff *)rq; 505 rq->qlen = 0; 506 spin_unlock_irqrestore(&rq->lock, flags); 507 508 /* re-process everything received between connection setup and MKIP */ 509 while (skb) { 510 struct sk_buff *next = skb->next; 511 512 skb->next = skb->prev = NULL; 513 if (!clip_devs) { 514 atm_return(vcc, skb->truesize); 515 kfree_skb(skb); 516 } else { 517 unsigned int len = skb->len; 518 519 skb_get(skb); 520 clip_push(vcc, skb); 521 PRIV(skb->dev)->stats.rx_packets--; 522 PRIV(skb->dev)->stats.rx_bytes -= len; 523 kfree_skb(skb); 524 } 525 526 skb = next; 527 } 528 return 0; 529 } 530 531 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 532 { 533 struct neighbour *neigh; 534 struct atmarp_entry *entry; 535 int error; 536 struct clip_vcc *clip_vcc; 537 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; 538 struct rtable *rt; 539 540 if (vcc->push != clip_push) { 541 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); 542 return -EBADF; 543 } 544 clip_vcc = CLIP_VCC(vcc); 545 if (!ip) { 546 if (!clip_vcc->entry) { 547 printk(KERN_ERR "hiding hidden ATMARP entry\n"); 548 return 0; 549 } 550 DPRINTK("setentry: remove\n"); 551 unlink_clip_vcc(clip_vcc); 552 return 0; 553 } 554 error = ip_route_output_key(&rt, &fl); 555 if (error) 556 return error; 557 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); 558 ip_rt_put(rt); 559 if (!neigh) 560 return -ENOMEM; 561 entry = NEIGH2ENTRY(neigh); 562 if (entry != clip_vcc->entry) { 563 if (!clip_vcc->entry) 564 DPRINTK("setentry: add\n"); 565 else { 566 DPRINTK("setentry: update\n"); 567 unlink_clip_vcc(clip_vcc); 568 } 569 link_vcc(clip_vcc, entry); 570 } 571 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 572 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); 573 neigh_release(neigh); 574 return error; 575 } 576 577 static void clip_setup(struct net_device *dev) 578 { 579 dev->hard_start_xmit = clip_start_xmit; 580 /* sg_xmit ... */ 581 dev->get_stats = clip_get_stats; 582 dev->type = ARPHRD_ATM; 583 dev->hard_header_len = RFC1483LLC_LEN; 584 dev->mtu = RFC1626_MTU; 585 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 586 /* When using a "real" qdisc, the qdisc determines the queue */ 587 /* length. tx_queue_len is only used for the default case, */ 588 /* without any more elaborate queuing. 100 is a reasonable */ 589 /* compromise between decent burst-tolerance and protection */ 590 /* against memory hogs. */ 591 } 592 593 static int clip_create(int number) 594 { 595 struct net_device *dev; 596 struct clip_priv *clip_priv; 597 int error; 598 599 if (number != -1) { 600 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 601 if (PRIV(dev)->number == number) 602 return -EEXIST; 603 } else { 604 number = 0; 605 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 606 if (PRIV(dev)->number >= number) 607 number = PRIV(dev)->number + 1; 608 } 609 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 610 if (!dev) 611 return -ENOMEM; 612 clip_priv = PRIV(dev); 613 sprintf(dev->name, "atm%d", number); 614 spin_lock_init(&clip_priv->xoff_lock); 615 clip_priv->number = number; 616 error = register_netdev(dev); 617 if (error) { 618 free_netdev(dev); 619 return error; 620 } 621 clip_priv->next = clip_devs; 622 clip_devs = dev; 623 DPRINTK("registered (net:%s)\n", dev->name); 624 return number; 625 } 626 627 static int clip_device_event(struct notifier_block *this, unsigned long event, 628 void *arg) 629 { 630 struct net_device *dev = arg; 631 632 if (event == NETDEV_UNREGISTER) { 633 neigh_ifdown(&clip_tbl, dev); 634 return NOTIFY_DONE; 635 } 636 637 /* ignore non-CLIP devices */ 638 if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) 639 return NOTIFY_DONE; 640 641 switch (event) { 642 case NETDEV_UP: 643 DPRINTK("clip_device_event NETDEV_UP\n"); 644 to_atmarpd(act_up, PRIV(dev)->number, 0); 645 break; 646 case NETDEV_GOING_DOWN: 647 DPRINTK("clip_device_event NETDEV_DOWN\n"); 648 to_atmarpd(act_down, PRIV(dev)->number, 0); 649 break; 650 case NETDEV_CHANGE: 651 case NETDEV_CHANGEMTU: 652 DPRINTK("clip_device_event NETDEV_CHANGE*\n"); 653 to_atmarpd(act_change, PRIV(dev)->number, 0); 654 break; 655 } 656 return NOTIFY_DONE; 657 } 658 659 static int clip_inet_event(struct notifier_block *this, unsigned long event, 660 void *ifa) 661 { 662 struct in_device *in_dev; 663 664 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 665 if (!in_dev || !in_dev->dev) { 666 printk(KERN_WARNING "clip_inet_event: no device\n"); 667 return NOTIFY_DONE; 668 } 669 /* 670 * Transitions are of the down-change-up type, so it's sufficient to 671 * handle the change on up. 672 */ 673 if (event != NETDEV_UP) 674 return NOTIFY_DONE; 675 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); 676 } 677 678 679 static struct notifier_block clip_dev_notifier = { 680 .notifier_call = clip_device_event, 681 }; 682 683 684 685 static struct notifier_block clip_inet_notifier = { 686 .notifier_call = clip_inet_event, 687 }; 688 689 690 691 static void atmarpd_close(struct atm_vcc *vcc) 692 { 693 DPRINTK("atmarpd_close\n"); 694 695 rtnl_lock(); 696 atmarpd = NULL; 697 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 698 rtnl_unlock(); 699 700 DPRINTK("(done)\n"); 701 module_put(THIS_MODULE); 702 } 703 704 705 static struct atmdev_ops atmarpd_dev_ops = { 706 .close = atmarpd_close 707 }; 708 709 710 static struct atm_dev atmarpd_dev = { 711 .ops = &atmarpd_dev_ops, 712 .type = "arpd", 713 .number = 999, 714 .lock = SPIN_LOCK_UNLOCKED 715 }; 716 717 718 static int atm_init_atmarp(struct atm_vcc *vcc) 719 { 720 rtnl_lock(); 721 if (atmarpd) { 722 rtnl_unlock(); 723 return -EADDRINUSE; 724 } 725 726 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); 727 728 atmarpd = vcc; 729 set_bit(ATM_VF_META,&vcc->flags); 730 set_bit(ATM_VF_READY,&vcc->flags); 731 /* allow replies and avoid getting closed if signaling dies */ 732 vcc->dev = &atmarpd_dev; 733 vcc_insert_socket(sk_atm(vcc)); 734 vcc->push = NULL; 735 vcc->pop = NULL; /* crash */ 736 vcc->push_oam = NULL; /* crash */ 737 rtnl_unlock(); 738 return 0; 739 } 740 741 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 742 { 743 struct atm_vcc *vcc = ATM_SD(sock); 744 int err = 0; 745 746 switch (cmd) { 747 case SIOCMKCLIP: 748 case ATMARPD_CTRL: 749 case ATMARP_MKIP: 750 case ATMARP_SETENTRY: 751 case ATMARP_ENCAP: 752 if (!capable(CAP_NET_ADMIN)) 753 return -EPERM; 754 break; 755 default: 756 return -ENOIOCTLCMD; 757 } 758 759 switch (cmd) { 760 case SIOCMKCLIP: 761 err = clip_create(arg); 762 break; 763 case ATMARPD_CTRL: 764 err = atm_init_atmarp(vcc); 765 if (!err) { 766 sock->state = SS_CONNECTED; 767 __module_get(THIS_MODULE); 768 } 769 break; 770 case ATMARP_MKIP: 771 err = clip_mkip(vcc, arg); 772 break; 773 case ATMARP_SETENTRY: 774 err = clip_setentry(vcc, (__force __be32)arg); 775 break; 776 case ATMARP_ENCAP: 777 err = clip_encap(vcc, arg); 778 break; 779 } 780 return err; 781 } 782 783 static struct atm_ioctl clip_ioctl_ops = { 784 .owner = THIS_MODULE, 785 .ioctl = clip_ioctl, 786 }; 787 788 #ifdef CONFIG_PROC_FS 789 790 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 791 { 792 static int code[] = { 1, 2, 10, 6, 1, 0 }; 793 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 794 795 if (*addr->sas_addr.pub) { 796 seq_printf(seq, "%s", addr->sas_addr.pub); 797 if (*addr->sas_addr.prv) 798 seq_putc(seq, '+'); 799 } else if (!*addr->sas_addr.prv) { 800 seq_printf(seq, "%s", "(none)"); 801 return; 802 } 803 if (*addr->sas_addr.prv) { 804 unsigned char *prv = addr->sas_addr.prv; 805 int *fields; 806 int i, j; 807 808 fields = *prv == ATM_AFI_E164 ? e164 : code; 809 for (i = 0; fields[i]; i++) { 810 for (j = fields[i]; j; j--) 811 seq_printf(seq, "%02X", *prv++); 812 if (fields[i + 1]) 813 seq_putc(seq, '.'); 814 } 815 } 816 } 817 818 /* This means the neighbour entry has no attached VCC objects. */ 819 #define SEQ_NO_VCC_TOKEN ((void *) 2) 820 821 static void atmarp_info(struct seq_file *seq, struct net_device *dev, 822 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 823 { 824 unsigned long exp; 825 char buf[17]; 826 int svc, llc, off; 827 828 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 829 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 830 831 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 832 833 if (clip_vcc == SEQ_NO_VCC_TOKEN) 834 exp = entry->neigh->used; 835 else 836 exp = clip_vcc->last_use; 837 838 exp = (jiffies - exp) / HZ; 839 840 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 841 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 842 843 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", 844 NIPQUAD(entry->ip)); 845 while (off < 16) 846 buf[off++] = ' '; 847 buf[off] = '\0'; 848 seq_printf(seq, "%s", buf); 849 850 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 851 if (time_before(jiffies, entry->expires)) 852 seq_printf(seq, "(resolving)\n"); 853 else 854 seq_printf(seq, "(expired, ref %d)\n", 855 atomic_read(&entry->neigh->refcnt)); 856 } else if (!svc) { 857 seq_printf(seq, "%d.%d.%d\n", 858 clip_vcc->vcc->dev->number, 859 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 860 } else { 861 svc_addr(seq, &clip_vcc->vcc->remote); 862 seq_putc(seq, '\n'); 863 } 864 } 865 866 struct clip_seq_state { 867 /* This member must be first. */ 868 struct neigh_seq_state ns; 869 870 /* Local to clip specific iteration. */ 871 struct clip_vcc *vcc; 872 }; 873 874 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 875 struct clip_vcc *curr) 876 { 877 if (!curr) { 878 curr = e->vccs; 879 if (!curr) 880 return SEQ_NO_VCC_TOKEN; 881 return curr; 882 } 883 if (curr == SEQ_NO_VCC_TOKEN) 884 return NULL; 885 886 curr = curr->next; 887 888 return curr; 889 } 890 891 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 892 struct atmarp_entry *e, loff_t * pos) 893 { 894 struct clip_vcc *vcc = state->vcc; 895 896 vcc = clip_seq_next_vcc(e, vcc); 897 if (vcc && pos != NULL) { 898 while (*pos) { 899 vcc = clip_seq_next_vcc(e, vcc); 900 if (!vcc) 901 break; 902 --(*pos); 903 } 904 } 905 state->vcc = vcc; 906 907 return vcc; 908 } 909 910 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 911 struct neighbour *n, loff_t * pos) 912 { 913 struct clip_seq_state *state = (struct clip_seq_state *)_state; 914 915 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); 916 } 917 918 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 919 { 920 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); 921 } 922 923 static int clip_seq_show(struct seq_file *seq, void *v) 924 { 925 static char atm_arp_banner[] = 926 "IPitf TypeEncp Idle IP address ATM address\n"; 927 928 if (v == SEQ_START_TOKEN) { 929 seq_puts(seq, atm_arp_banner); 930 } else { 931 struct clip_seq_state *state = seq->private; 932 struct neighbour *n = v; 933 struct clip_vcc *vcc = state->vcc; 934 935 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); 936 } 937 return 0; 938 } 939 940 static struct seq_operations arp_seq_ops = { 941 .start = clip_seq_start, 942 .next = neigh_seq_next, 943 .stop = neigh_seq_stop, 944 .show = clip_seq_show, 945 }; 946 947 static int arp_seq_open(struct inode *inode, struct file *file) 948 { 949 struct clip_seq_state *state; 950 struct seq_file *seq; 951 int rc = -EAGAIN; 952 953 state = kzalloc(sizeof(*state), GFP_KERNEL); 954 if (!state) { 955 rc = -ENOMEM; 956 goto out_kfree; 957 } 958 state->ns.neigh_sub_iter = clip_seq_sub_iter; 959 960 rc = seq_open(file, &arp_seq_ops); 961 if (rc) 962 goto out_kfree; 963 964 seq = file->private_data; 965 seq->private = state; 966 out: 967 return rc; 968 969 out_kfree: 970 kfree(state); 971 goto out; 972 } 973 974 static const struct file_operations arp_seq_fops = { 975 .open = arp_seq_open, 976 .read = seq_read, 977 .llseek = seq_lseek, 978 .release = seq_release_private, 979 .owner = THIS_MODULE 980 }; 981 #endif 982 983 static int __init atm_clip_init(void) 984 { 985 neigh_table_init_no_netlink(&clip_tbl); 986 987 clip_tbl_hook = &clip_tbl; 988 register_atm_ioctl(&clip_ioctl_ops); 989 register_netdevice_notifier(&clip_dev_notifier); 990 register_inetaddr_notifier(&clip_inet_notifier); 991 992 setup_timer(&idle_timer, idle_timer_check, 0); 993 994 #ifdef CONFIG_PROC_FS 995 { 996 struct proc_dir_entry *p; 997 998 p = create_proc_entry("arp", S_IRUGO, atm_proc_root); 999 if (p) 1000 p->proc_fops = &arp_seq_fops; 1001 } 1002 #endif 1003 1004 return 0; 1005 } 1006 1007 static void __exit atm_clip_exit(void) 1008 { 1009 struct net_device *dev, *next; 1010 1011 remove_proc_entry("arp", atm_proc_root); 1012 1013 unregister_inetaddr_notifier(&clip_inet_notifier); 1014 unregister_netdevice_notifier(&clip_dev_notifier); 1015 1016 deregister_atm_ioctl(&clip_ioctl_ops); 1017 1018 /* First, stop the idle timer, so it stops banging 1019 * on the table. 1020 */ 1021 del_timer_sync(&idle_timer); 1022 1023 /* Next, purge the table, so that the device 1024 * unregister loop below does not hang due to 1025 * device references remaining in the table. 1026 */ 1027 neigh_ifdown(&clip_tbl, NULL); 1028 1029 dev = clip_devs; 1030 while (dev) { 1031 next = PRIV(dev)->next; 1032 unregister_netdev(dev); 1033 free_netdev(dev); 1034 dev = next; 1035 } 1036 1037 /* Now it is safe to fully shutdown whole table. */ 1038 neigh_table_clear(&clip_tbl); 1039 1040 clip_tbl_hook = NULL; 1041 } 1042 1043 module_init(atm_clip_init); 1044 module_exit(atm_clip_exit); 1045 MODULE_AUTHOR("Werner Almesberger"); 1046 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 1047 MODULE_LICENSE("GPL"); 1048