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