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/config.h> 6 #include <linux/string.h> 7 #include <linux/errno.h> 8 #include <linux/kernel.h> /* for UINT_MAX */ 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/netdevice.h> 12 #include <linux/skbuff.h> 13 #include <linux/wait.h> 14 #include <linux/timer.h> 15 #include <linux/if_arp.h> /* for some manifest constants */ 16 #include <linux/notifier.h> 17 #include <linux/atm.h> 18 #include <linux/atmdev.h> 19 #include <linux/atmclip.h> 20 #include <linux/atmarp.h> 21 #include <linux/capability.h> 22 #include <linux/ip.h> /* for net/route.h */ 23 #include <linux/in.h> /* for struct sockaddr_in */ 24 #include <linux/if.h> /* for IFF_UP */ 25 #include <linux/inetdevice.h> 26 #include <linux/bitops.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 "ipcommon.h" 42 #include <net/atmclip.h> 43 44 45 #if 0 46 #define DPRINTK(format,args...) printk(format,##args) 47 #else 48 #define DPRINTK(format,args...) 49 #endif 50 51 52 static struct net_device *clip_devs; 53 static struct atm_vcc *atmarpd; 54 static struct neigh_table clip_tbl; 55 static struct timer_list idle_timer; 56 57 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, unsigned long ip) 58 { 59 struct sock *sk; 60 struct atmarp_ctrl *ctrl; 61 struct sk_buff *skb; 62 63 DPRINTK("to_atmarpd(%d)\n", type); 64 if (!atmarpd) 65 return -EUNATCH; 66 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); 67 if (!skb) 68 return -ENOMEM; 69 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); 70 ctrl->type = type; 71 ctrl->itf_num = itf; 72 ctrl->ip = ip; 73 atm_force_charge(atmarpd, skb->truesize); 74 75 sk = sk_atm(atmarpd); 76 skb_queue_tail(&sk->sk_receive_queue, skb); 77 sk->sk_data_ready(sk, skb->len); 78 return 0; 79 } 80 81 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) 82 { 83 DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, 84 entry->neigh); 85 clip_vcc->entry = entry; 86 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 87 clip_vcc->next = entry->vccs; 88 entry->vccs = clip_vcc; 89 entry->neigh->used = jiffies; 90 } 91 92 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 93 { 94 struct atmarp_entry *entry = clip_vcc->entry; 95 struct clip_vcc **walk; 96 97 if (!entry) { 98 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); 99 return; 100 } 101 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ 102 entry->neigh->used = jiffies; 103 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 104 if (*walk == clip_vcc) { 105 int error; 106 107 *walk = clip_vcc->next; /* atomic */ 108 clip_vcc->entry = NULL; 109 if (clip_vcc->xoff) 110 netif_wake_queue(entry->neigh->dev); 111 if (entry->vccs) 112 goto out; 113 entry->expires = jiffies - 1; 114 /* force resolution or expiration */ 115 error = neigh_update(entry->neigh, NULL, NUD_NONE, 116 NEIGH_UPDATE_F_ADMIN); 117 if (error) 118 printk(KERN_CRIT "unlink_clip_vcc: " 119 "neigh_update failed with %d\n", error); 120 goto out; 121 } 122 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " 123 "0x%p)\n", entry, clip_vcc); 124 out: 125 netif_tx_unlock_bh(entry->neigh->dev); 126 } 127 128 /* The neighbour entry n->lock is held. */ 129 static int neigh_check_cb(struct neighbour *n) 130 { 131 struct atmarp_entry *entry = NEIGH2ENTRY(n); 132 struct clip_vcc *cv; 133 134 for (cv = entry->vccs; cv; cv = cv->next) { 135 unsigned long exp = cv->last_use + cv->idle_timeout; 136 137 if (cv->idle_timeout && time_after(jiffies, exp)) { 138 DPRINTK("releasing vcc %p->%p of entry %p\n", 139 cv, cv->vcc, entry); 140 vcc_release_async(cv->vcc, -ETIMEDOUT); 141 } 142 } 143 144 if (entry->vccs || time_before(jiffies, entry->expires)) 145 return 0; 146 147 if (atomic_read(&n->refcnt) > 1) { 148 struct sk_buff *skb; 149 150 DPRINTK("destruction postponed with ref %d\n", 151 atomic_read(&n->refcnt)); 152 153 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 154 dev_kfree_skb(skb); 155 156 return 0; 157 } 158 159 DPRINTK("expired neigh %p\n", n); 160 return 1; 161 } 162 163 static void idle_timer_check(unsigned long dummy) 164 { 165 write_lock(&clip_tbl.lock); 166 __neigh_for_each_release(&clip_tbl, neigh_check_cb); 167 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 168 write_unlock(&clip_tbl.lock); 169 } 170 171 static int clip_arp_rcv(struct sk_buff *skb) 172 { 173 struct atm_vcc *vcc; 174 175 DPRINTK("clip_arp_rcv\n"); 176 vcc = ATM_SKB(skb)->vcc; 177 if (!vcc || !atm_charge(vcc, skb->truesize)) { 178 dev_kfree_skb_any(skb); 179 return 0; 180 } 181 DPRINTK("pushing to %p\n", vcc); 182 DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push); 183 CLIP_VCC(vcc)->old_push(vcc, skb); 184 return 0; 185 } 186 187 static const unsigned char llc_oui[] = { 188 0xaa, /* DSAP: non-ISO */ 189 0xaa, /* SSAP: non-ISO */ 190 0x03, /* Ctrl: Unnumbered Information Command PDU */ 191 0x00, /* OUI: EtherType */ 192 0x00, 193 0x00 194 }; 195 196 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) 197 { 198 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 199 200 DPRINTK("clip push\n"); 201 if (!skb) { 202 DPRINTK("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->mac.raw = skb->data; 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 = ((u16 *) skb->data)[3]; 224 skb_pull(skb, RFC1483LLC_LEN); 225 if (skb->protocol == htons(ETH_P_ARP)) { 226 PRIV(skb->dev)->stats.rx_packets++; 227 PRIV(skb->dev)->stats.rx_bytes += skb->len; 228 clip_arp_rcv(skb); 229 return; 230 } 231 } 232 clip_vcc->last_use = jiffies; 233 PRIV(skb->dev)->stats.rx_packets++; 234 PRIV(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 DPRINTK("clip_pop(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_destroy(struct neighbour *neigh) 266 { 267 DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh); 268 if (NEIGH2ENTRY(neigh)->vccs) 269 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n"); 270 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef; 271 } 272 273 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) 274 { 275 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); 276 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); 277 } 278 279 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) 280 { 281 #ifndef CONFIG_ATM_CLIP_NO_ICMP 282 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 283 #endif 284 kfree_skb(skb); 285 } 286 287 static struct neigh_ops clip_neigh_ops = { 288 .family = AF_INET, 289 .solicit = clip_neigh_solicit, 290 .error_report = clip_neigh_error, 291 .output = dev_queue_xmit, 292 .connected_output = dev_queue_xmit, 293 .hh_output = dev_queue_xmit, 294 .queue_xmit = dev_queue_xmit, 295 }; 296 297 static int clip_constructor(struct neighbour *neigh) 298 { 299 struct atmarp_entry *entry = NEIGH2ENTRY(neigh); 300 struct net_device *dev = neigh->dev; 301 struct in_device *in_dev; 302 struct neigh_parms *parms; 303 304 DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry); 305 neigh->type = inet_addr_type(entry->ip); 306 if (neigh->type != RTN_UNICAST) 307 return -EINVAL; 308 309 rcu_read_lock(); 310 in_dev = __in_dev_get_rcu(dev); 311 if (!in_dev) { 312 rcu_read_unlock(); 313 return -EINVAL; 314 } 315 316 parms = in_dev->arp_parms; 317 __neigh_parms_put(neigh->parms); 318 neigh->parms = neigh_parms_clone(parms); 319 rcu_read_unlock(); 320 321 neigh->ops = &clip_neigh_ops; 322 neigh->output = neigh->nud_state & NUD_VALID ? 323 neigh->ops->connected_output : neigh->ops->output; 324 entry->neigh = neigh; 325 entry->vccs = NULL; 326 entry->expires = jiffies - 1; 327 return 0; 328 } 329 330 static u32 clip_hash(const void *pkey, const struct net_device *dev) 331 { 332 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); 333 } 334 335 static struct neigh_table clip_tbl = { 336 .family = AF_INET, 337 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), 338 .key_len = 4, 339 .hash = clip_hash, 340 .constructor = clip_constructor, 341 .id = "clip_arp_cache", 342 343 /* parameters are copied from ARP ... */ 344 .parms = { 345 .tbl = &clip_tbl, 346 .neigh_destructor = clip_neigh_destroy, 347 .base_reachable_time = 30 * HZ, 348 .retrans_time = 1 * HZ, 349 .gc_staletime = 60 * HZ, 350 .reachable_time = 30 * HZ, 351 .delay_probe_time = 5 * HZ, 352 .queue_len = 3, 353 .ucast_probes = 3, 354 .mcast_probes = 3, 355 .anycast_delay = 1 * HZ, 356 .proxy_delay = (8 * HZ) / 10, 357 .proxy_qlen = 64, 358 .locktime = 1 * HZ, 359 }, 360 .gc_interval = 30 * HZ, 361 .gc_thresh1 = 128, 362 .gc_thresh2 = 512, 363 .gc_thresh3 = 1024, 364 }; 365 366 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 367 368 /* 369 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 370 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 371 * don't increment the usage count. This is used to create entries in 372 * clip_setentry. 373 */ 374 375 static int clip_encap(struct atm_vcc *vcc, int mode) 376 { 377 CLIP_VCC(vcc)->encap = mode; 378 return 0; 379 } 380 381 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) 382 { 383 struct clip_priv *clip_priv = PRIV(dev); 384 struct atmarp_entry *entry; 385 struct atm_vcc *vcc; 386 int old; 387 unsigned long flags; 388 389 DPRINTK("clip_start_xmit (skb %p)\n", skb); 390 if (!skb->dst) { 391 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); 392 dev_kfree_skb(skb); 393 clip_priv->stats.tx_dropped++; 394 return 0; 395 } 396 if (!skb->dst->neighbour) { 397 #if 0 398 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); 399 if (!skb->dst->neighbour) { 400 dev_kfree_skb(skb); /* lost that one */ 401 clip_priv->stats.tx_dropped++; 402 return 0; 403 } 404 #endif 405 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); 406 dev_kfree_skb(skb); 407 clip_priv->stats.tx_dropped++; 408 return 0; 409 } 410 entry = NEIGH2ENTRY(skb->dst->neighbour); 411 if (!entry->vccs) { 412 if (time_after(jiffies, entry->expires)) { 413 /* should be resolved */ 414 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 415 to_atmarpd(act_need, PRIV(dev)->number, entry->ip); 416 } 417 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 418 skb_queue_tail(&entry->neigh->arp_queue, skb); 419 else { 420 dev_kfree_skb(skb); 421 clip_priv->stats.tx_dropped++; 422 } 423 return 0; 424 } 425 DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs); 426 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 427 DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); 428 if (entry->vccs->encap) { 429 void *here; 430 431 here = skb_push(skb, RFC1483LLC_LEN); 432 memcpy(here, llc_oui, sizeof(llc_oui)); 433 ((u16 *) here)[3] = skb->protocol; 434 } 435 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 436 ATM_SKB(skb)->atm_options = vcc->atm_options; 437 entry->vccs->last_use = jiffies; 438 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 439 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 440 if (old) { 441 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); 442 return 0; 443 } 444 clip_priv->stats.tx_packets++; 445 clip_priv->stats.tx_bytes += skb->len; 446 vcc->send(vcc, skb); 447 if (atm_may_send(vcc, 0)) { 448 entry->vccs->xoff = 0; 449 return 0; 450 } 451 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 452 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 453 barrier(); 454 if (!entry->vccs->xoff) 455 netif_start_queue(dev); 456 /* Oh, we just raced with clip_pop. netif_start_queue should be 457 good enough, because nothing should really be asleep because 458 of the brief netif_stop_queue. If this isn't true or if it 459 changes, use netif_wake_queue instead. */ 460 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 461 return 0; 462 } 463 464 static struct net_device_stats *clip_get_stats(struct net_device *dev) 465 { 466 return &PRIV(dev)->stats; 467 } 468 469 static int clip_mkip(struct atm_vcc *vcc, int timeout) 470 { 471 struct clip_vcc *clip_vcc; 472 struct sk_buff_head copy; 473 struct sk_buff *skb; 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 skb_queue_head_init(©); 494 skb_migrate(&sk_atm(vcc)->sk_receive_queue, ©); 495 /* re-process everything received between connection setup and MKIP */ 496 while ((skb = skb_dequeue(©)) != NULL) 497 if (!clip_devs) { 498 atm_return(vcc, skb->truesize); 499 kfree_skb(skb); 500 } else { 501 unsigned int len = skb->len; 502 503 clip_push(vcc, skb); 504 PRIV(skb->dev)->stats.rx_packets--; 505 PRIV(skb->dev)->stats.rx_bytes -= len; 506 } 507 return 0; 508 } 509 510 static int clip_setentry(struct atm_vcc *vcc, u32 ip) 511 { 512 struct neighbour *neigh; 513 struct atmarp_entry *entry; 514 int error; 515 struct clip_vcc *clip_vcc; 516 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; 517 struct rtable *rt; 518 519 if (vcc->push != clip_push) { 520 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); 521 return -EBADF; 522 } 523 clip_vcc = CLIP_VCC(vcc); 524 if (!ip) { 525 if (!clip_vcc->entry) { 526 printk(KERN_ERR "hiding hidden ATMARP entry\n"); 527 return 0; 528 } 529 DPRINTK("setentry: remove\n"); 530 unlink_clip_vcc(clip_vcc); 531 return 0; 532 } 533 error = ip_route_output_key(&rt, &fl); 534 if (error) 535 return error; 536 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); 537 ip_rt_put(rt); 538 if (!neigh) 539 return -ENOMEM; 540 entry = NEIGH2ENTRY(neigh); 541 if (entry != clip_vcc->entry) { 542 if (!clip_vcc->entry) 543 DPRINTK("setentry: add\n"); 544 else { 545 DPRINTK("setentry: update\n"); 546 unlink_clip_vcc(clip_vcc); 547 } 548 link_vcc(clip_vcc, entry); 549 } 550 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 551 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); 552 neigh_release(neigh); 553 return error; 554 } 555 556 static void clip_setup(struct net_device *dev) 557 { 558 dev->hard_start_xmit = clip_start_xmit; 559 /* sg_xmit ... */ 560 dev->get_stats = clip_get_stats; 561 dev->type = ARPHRD_ATM; 562 dev->hard_header_len = RFC1483LLC_LEN; 563 dev->mtu = RFC1626_MTU; 564 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 565 /* When using a "real" qdisc, the qdisc determines the queue */ 566 /* length. tx_queue_len is only used for the default case, */ 567 /* without any more elaborate queuing. 100 is a reasonable */ 568 /* compromise between decent burst-tolerance and protection */ 569 /* against memory hogs. */ 570 } 571 572 static int clip_create(int number) 573 { 574 struct net_device *dev; 575 struct clip_priv *clip_priv; 576 int error; 577 578 if (number != -1) { 579 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 580 if (PRIV(dev)->number == number) 581 return -EEXIST; 582 } else { 583 number = 0; 584 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 585 if (PRIV(dev)->number >= number) 586 number = PRIV(dev)->number + 1; 587 } 588 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 589 if (!dev) 590 return -ENOMEM; 591 clip_priv = PRIV(dev); 592 sprintf(dev->name, "atm%d", number); 593 spin_lock_init(&clip_priv->xoff_lock); 594 clip_priv->number = number; 595 error = register_netdev(dev); 596 if (error) { 597 free_netdev(dev); 598 return error; 599 } 600 clip_priv->next = clip_devs; 601 clip_devs = dev; 602 DPRINTK("registered (net:%s)\n", dev->name); 603 return number; 604 } 605 606 static int clip_device_event(struct notifier_block *this, unsigned long event, 607 void *arg) 608 { 609 struct net_device *dev = arg; 610 611 if (event == NETDEV_UNREGISTER) { 612 neigh_ifdown(&clip_tbl, dev); 613 return NOTIFY_DONE; 614 } 615 616 /* ignore non-CLIP devices */ 617 if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) 618 return NOTIFY_DONE; 619 620 switch (event) { 621 case NETDEV_UP: 622 DPRINTK("clip_device_event NETDEV_UP\n"); 623 to_atmarpd(act_up, PRIV(dev)->number, 0); 624 break; 625 case NETDEV_GOING_DOWN: 626 DPRINTK("clip_device_event NETDEV_DOWN\n"); 627 to_atmarpd(act_down, PRIV(dev)->number, 0); 628 break; 629 case NETDEV_CHANGE: 630 case NETDEV_CHANGEMTU: 631 DPRINTK("clip_device_event NETDEV_CHANGE*\n"); 632 to_atmarpd(act_change, PRIV(dev)->number, 0); 633 break; 634 } 635 return NOTIFY_DONE; 636 } 637 638 static int clip_inet_event(struct notifier_block *this, unsigned long event, 639 void *ifa) 640 { 641 struct in_device *in_dev; 642 643 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 644 if (!in_dev || !in_dev->dev) { 645 printk(KERN_WARNING "clip_inet_event: no device\n"); 646 return NOTIFY_DONE; 647 } 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 DPRINTK("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 DPRINTK("(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 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, 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, "%d.%d.%d.%d", 823 NIPQUAD(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 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); 900 } 901 902 static int clip_seq_show(struct seq_file *seq, void *v) 903 { 904 static char atm_arp_banner[] = 905 "IPitf TypeEncp Idle IP address ATM address\n"; 906 907 if (v == SEQ_START_TOKEN) { 908 seq_puts(seq, atm_arp_banner); 909 } else { 910 struct clip_seq_state *state = seq->private; 911 struct neighbour *n = v; 912 struct clip_vcc *vcc = state->vcc; 913 914 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); 915 } 916 return 0; 917 } 918 919 static struct seq_operations arp_seq_ops = { 920 .start = clip_seq_start, 921 .next = neigh_seq_next, 922 .stop = neigh_seq_stop, 923 .show = clip_seq_show, 924 }; 925 926 static int arp_seq_open(struct inode *inode, struct file *file) 927 { 928 struct clip_seq_state *state; 929 struct seq_file *seq; 930 int rc = -EAGAIN; 931 932 state = kmalloc(sizeof(*state), GFP_KERNEL); 933 if (!state) { 934 rc = -ENOMEM; 935 goto out_kfree; 936 } 937 memset(state, 0, sizeof(*state)); 938 state->ns.neigh_sub_iter = clip_seq_sub_iter; 939 940 rc = seq_open(file, &arp_seq_ops); 941 if (rc) 942 goto out_kfree; 943 944 seq = file->private_data; 945 seq->private = state; 946 out: 947 return rc; 948 949 out_kfree: 950 kfree(state); 951 goto out; 952 } 953 954 static struct file_operations arp_seq_fops = { 955 .open = arp_seq_open, 956 .read = seq_read, 957 .llseek = seq_lseek, 958 .release = seq_release_private, 959 .owner = THIS_MODULE 960 }; 961 #endif 962 963 static int __init atm_clip_init(void) 964 { 965 struct proc_dir_entry *p; 966 neigh_table_init_no_netlink(&clip_tbl); 967 968 clip_tbl_hook = &clip_tbl; 969 register_atm_ioctl(&clip_ioctl_ops); 970 register_netdevice_notifier(&clip_dev_notifier); 971 register_inetaddr_notifier(&clip_inet_notifier); 972 973 setup_timer(&idle_timer, idle_timer_check, 0); 974 975 p = create_proc_entry("arp", S_IRUGO, atm_proc_root); 976 if (p) 977 p->proc_fops = &arp_seq_fops; 978 979 return 0; 980 } 981 982 static void __exit atm_clip_exit(void) 983 { 984 struct net_device *dev, *next; 985 986 remove_proc_entry("arp", atm_proc_root); 987 988 unregister_inetaddr_notifier(&clip_inet_notifier); 989 unregister_netdevice_notifier(&clip_dev_notifier); 990 991 deregister_atm_ioctl(&clip_ioctl_ops); 992 993 /* First, stop the idle timer, so it stops banging 994 * on the table. 995 */ 996 del_timer_sync(&idle_timer); 997 998 /* Next, purge the table, so that the device 999 * unregister loop below does not hang due to 1000 * device references remaining in the table. 1001 */ 1002 neigh_ifdown(&clip_tbl, NULL); 1003 1004 dev = clip_devs; 1005 while (dev) { 1006 next = PRIV(dev)->next; 1007 unregister_netdev(dev); 1008 free_netdev(dev); 1009 dev = next; 1010 } 1011 1012 /* Now it is safe to fully shutdown whole table. */ 1013 neigh_table_clear(&clip_tbl); 1014 1015 clip_tbl_hook = NULL; 1016 } 1017 1018 module_init(atm_clip_init); 1019 module_exit(atm_clip_exit); 1020 MODULE_AUTHOR("Werner Almesberger"); 1021 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 1022 MODULE_LICENSE("GPL"); 1023