1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */ 2 3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 4 5 6 #include <linux/config.h> 7 #include <linux/string.h> 8 #include <linux/errno.h> 9 #include <linux/kernel.h> /* for UINT_MAX */ 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/netdevice.h> 13 #include <linux/skbuff.h> 14 #include <linux/wait.h> 15 #include <linux/timer.h> 16 #include <linux/if_arp.h> /* for some manifest constants */ 17 #include <linux/notifier.h> 18 #include <linux/atm.h> 19 #include <linux/atmdev.h> 20 #include <linux/atmclip.h> 21 #include <linux/atmarp.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 static int start_timer = 1; 57 58 59 static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip) 60 { 61 struct sock *sk; 62 struct atmarp_ctrl *ctrl; 63 struct sk_buff *skb; 64 65 DPRINTK("to_atmarpd(%d)\n",type); 66 if (!atmarpd) return -EUNATCH; 67 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); 68 if (!skb) 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 82 static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry) 83 { 84 DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry, 85 entry->neigh); 86 clip_vcc->entry = entry; 87 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 88 clip_vcc->next = entry->vccs; 89 entry->vccs = clip_vcc; 90 entry->neigh->used = jiffies; 91 } 92 93 94 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 95 { 96 struct atmarp_entry *entry = clip_vcc->entry; 97 struct clip_vcc **walk; 98 99 if (!entry) { 100 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc); 101 return; 102 } 103 spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */ 104 entry->neigh->used = jiffies; 105 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 106 if (*walk == clip_vcc) { 107 int error; 108 109 *walk = clip_vcc->next; /* atomic */ 110 clip_vcc->entry = NULL; 111 if (clip_vcc->xoff) 112 netif_wake_queue(entry->neigh->dev); 113 if (entry->vccs) 114 goto out; 115 entry->expires = jiffies-1; 116 /* force resolution or expiration */ 117 error = neigh_update(entry->neigh, NULL, NUD_NONE, 118 NEIGH_UPDATE_F_ADMIN); 119 if (error) 120 printk(KERN_CRIT "unlink_clip_vcc: " 121 "neigh_update failed with %d\n",error); 122 goto out; 123 } 124 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " 125 "0x%p)\n",entry,clip_vcc); 126 out: 127 spin_unlock_bh(&entry->neigh->dev->xmit_lock); 128 } 129 130 /* The neighbour entry n->lock is held. */ 131 static int neigh_check_cb(struct neighbour *n) 132 { 133 struct atmarp_entry *entry = NEIGH2ENTRY(n); 134 struct clip_vcc *cv; 135 136 for (cv = entry->vccs; cv; cv = cv->next) { 137 unsigned long exp = cv->last_use + cv->idle_timeout; 138 139 if (cv->idle_timeout && time_after(jiffies, exp)) { 140 DPRINTK("releasing vcc %p->%p of entry %p\n", 141 cv, cv->vcc, entry); 142 vcc_release_async(cv->vcc, -ETIMEDOUT); 143 } 144 } 145 146 if (entry->vccs || time_before(jiffies, entry->expires)) 147 return 0; 148 149 if (atomic_read(&n->refcnt) > 1) { 150 struct sk_buff *skb; 151 152 DPRINTK("destruction postponed with ref %d\n", 153 atomic_read(&n->refcnt)); 154 155 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 156 dev_kfree_skb(skb); 157 158 return 0; 159 } 160 161 DPRINTK("expired neigh %p\n",n); 162 return 1; 163 } 164 165 static void idle_timer_check(unsigned long dummy) 166 { 167 write_lock(&clip_tbl.lock); 168 __neigh_for_each_release(&clip_tbl, neigh_check_cb); 169 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); 170 write_unlock(&clip_tbl.lock); 171 } 172 173 static int clip_arp_rcv(struct sk_buff *skb) 174 { 175 struct atm_vcc *vcc; 176 177 DPRINTK("clip_arp_rcv\n"); 178 vcc = ATM_SKB(skb)->vcc; 179 if (!vcc || !atm_charge(vcc,skb->truesize)) { 180 dev_kfree_skb_any(skb); 181 return 0; 182 } 183 DPRINTK("pushing to %p\n",vcc); 184 DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push); 185 CLIP_VCC(vcc)->old_push(vcc,skb); 186 return 0; 187 } 188 189 static const unsigned char llc_oui[] = { 190 0xaa, /* DSAP: non-ISO */ 191 0xaa, /* SSAP: non-ISO */ 192 0x03, /* Ctrl: Unnumbered Information Command PDU */ 193 0x00, /* OUI: EtherType */ 194 0x00, 195 0x00 }; 196 197 static void clip_push(struct atm_vcc *vcc,struct sk_buff *skb) 198 { 199 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 200 201 DPRINTK("clip push\n"); 202 if (!skb) { 203 DPRINTK("removing VCC %p\n",clip_vcc); 204 if (clip_vcc->entry) 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 || skb->len < RFC1483LLC_LEN || memcmp(skb->data, 219 llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP); 220 else { 221 skb->protocol = ((u16 *) skb->data)[3]; 222 skb_pull(skb,RFC1483LLC_LEN); 223 if (skb->protocol == htons(ETH_P_ARP)) { 224 PRIV(skb->dev)->stats.rx_packets++; 225 PRIV(skb->dev)->stats.rx_bytes += skb->len; 226 clip_arp_rcv(skb); 227 return; 228 } 229 } 230 clip_vcc->last_use = jiffies; 231 PRIV(skb->dev)->stats.rx_packets++; 232 PRIV(skb->dev)->stats.rx_bytes += skb->len; 233 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 234 netif_rx(skb); 235 } 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 */ 242 243 244 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) 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) netif_wake_queue(dev); 259 } 260 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags); 261 } 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 *) 0xdeadbeef; 270 } 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 } 278 279 280 static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb) 281 { 282 #ifndef CONFIG_ATM_CLIP_NO_ICMP 283 icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0); 284 #endif 285 kfree_skb(skb); 286 } 287 288 289 static struct neigh_ops clip_neigh_ops = { 290 .family = AF_INET, 291 .destructor = clip_neigh_destroy, 292 .solicit = clip_neigh_solicit, 293 .error_report = clip_neigh_error, 294 .output = dev_queue_xmit, 295 .connected_output = dev_queue_xmit, 296 .hh_output = dev_queue_xmit, 297 .queue_xmit = dev_queue_xmit, 298 }; 299 300 301 static int clip_constructor(struct neighbour *neigh) 302 { 303 struct atmarp_entry *entry = NEIGH2ENTRY(neigh); 304 struct net_device *dev = neigh->dev; 305 struct in_device *in_dev; 306 struct neigh_parms *parms; 307 308 DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry); 309 neigh->type = inet_addr_type(entry->ip); 310 if (neigh->type != RTN_UNICAST) return -EINVAL; 311 312 rcu_read_lock(); 313 in_dev = rcu_dereference(__in_dev_get(dev)); 314 if (!in_dev) { 315 rcu_read_unlock(); 316 return -EINVAL; 317 } 318 319 parms = in_dev->arp_parms; 320 __neigh_parms_put(neigh->parms); 321 neigh->parms = neigh_parms_clone(parms); 322 rcu_read_unlock(); 323 324 neigh->ops = &clip_neigh_ops; 325 neigh->output = neigh->nud_state & NUD_VALID ? 326 neigh->ops->connected_output : neigh->ops->output; 327 entry->neigh = neigh; 328 entry->vccs = NULL; 329 entry->expires = jiffies-1; 330 return 0; 331 } 332 333 static u32 clip_hash(const void *pkey, const struct net_device *dev) 334 { 335 return jhash_2words(*(u32 *)pkey, dev->ifindex, clip_tbl.hash_rnd); 336 } 337 338 static struct neigh_table clip_tbl = { 339 .family = AF_INET, 340 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), 341 .key_len = 4, 342 .hash = clip_hash, 343 .constructor = clip_constructor, 344 .id = "clip_arp_cache", 345 346 /* parameters are copied from ARP ... */ 347 .parms = { 348 .tbl = &clip_tbl, 349 .base_reachable_time = 30 * HZ, 350 .retrans_time = 1 * HZ, 351 .gc_staletime = 60 * HZ, 352 .reachable_time = 30 * HZ, 353 .delay_probe_time = 5 * HZ, 354 .queue_len = 3, 355 .ucast_probes = 3, 356 .mcast_probes = 3, 357 .anycast_delay = 1 * HZ, 358 .proxy_delay = (8 * HZ) / 10, 359 .proxy_qlen = 64, 360 .locktime = 1 * HZ, 361 }, 362 .gc_interval = 30 * HZ, 363 .gc_thresh1 = 128, 364 .gc_thresh2 = 512, 365 .gc_thresh3 = 1024, 366 }; 367 368 369 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 370 371 /* 372 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 373 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 374 * don't increment the usage count. This is used to create entries in 375 * clip_setentry. 376 */ 377 378 379 static int clip_encap(struct atm_vcc *vcc,int mode) 380 { 381 CLIP_VCC(vcc)->encap = mode; 382 return 0; 383 } 384 385 386 static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev) 387 { 388 struct clip_priv *clip_priv = PRIV(dev); 389 struct atmarp_entry *entry; 390 struct atm_vcc *vcc; 391 int old; 392 unsigned long flags; 393 394 DPRINTK("clip_start_xmit (skb %p)\n",skb); 395 if (!skb->dst) { 396 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); 397 dev_kfree_skb(skb); 398 clip_priv->stats.tx_dropped++; 399 return 0; 400 } 401 if (!skb->dst->neighbour) { 402 #if 0 403 skb->dst->neighbour = clip_find_neighbour(skb->dst,1); 404 if (!skb->dst->neighbour) { 405 dev_kfree_skb(skb); /* lost that one */ 406 clip_priv->stats.tx_dropped++; 407 return 0; 408 } 409 #endif 410 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); 411 dev_kfree_skb(skb); 412 clip_priv->stats.tx_dropped++; 413 return 0; 414 } 415 entry = NEIGH2ENTRY(skb->dst->neighbour); 416 if (!entry->vccs) { 417 if (time_after(jiffies, entry->expires)) { 418 /* should be resolved */ 419 entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ; 420 to_atmarpd(act_need,PRIV(dev)->number,entry->ip); 421 } 422 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 423 skb_queue_tail(&entry->neigh->arp_queue,skb); 424 else { 425 dev_kfree_skb(skb); 426 clip_priv->stats.tx_dropped++; 427 } 428 return 0; 429 } 430 DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs); 431 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 432 DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc); 433 if (entry->vccs->encap) { 434 void *here; 435 436 here = skb_push(skb,RFC1483LLC_LEN); 437 memcpy(here,llc_oui,sizeof(llc_oui)); 438 ((u16 *) here)[3] = skb->protocol; 439 } 440 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 441 ATM_SKB(skb)->atm_options = vcc->atm_options; 442 entry->vccs->last_use = jiffies; 443 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev); 444 old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */ 445 if (old) { 446 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); 447 return 0; 448 } 449 clip_priv->stats.tx_packets++; 450 clip_priv->stats.tx_bytes += skb->len; 451 (void) vcc->send(vcc,skb); 452 if (atm_may_send(vcc,0)) { 453 entry->vccs->xoff = 0; 454 return 0; 455 } 456 spin_lock_irqsave(&clip_priv->xoff_lock,flags); 457 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 458 barrier(); 459 if (!entry->vccs->xoff) 460 netif_start_queue(dev); 461 /* Oh, we just raced with clip_pop. netif_start_queue should be 462 good enough, because nothing should really be asleep because 463 of the brief netif_stop_queue. If this isn't true or if it 464 changes, use netif_wake_queue instead. */ 465 spin_unlock_irqrestore(&clip_priv->xoff_lock,flags); 466 return 0; 467 } 468 469 470 static struct net_device_stats *clip_get_stats(struct net_device *dev) 471 { 472 return &PRIV(dev)->stats; 473 } 474 475 476 static int clip_mkip(struct atm_vcc *vcc,int timeout) 477 { 478 struct clip_vcc *clip_vcc; 479 struct sk_buff_head copy; 480 struct sk_buff *skb; 481 482 if (!vcc->push) return -EBADFD; 483 clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL); 484 if (!clip_vcc) return -ENOMEM; 485 DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc); 486 clip_vcc->vcc = vcc; 487 vcc->user_back = clip_vcc; 488 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 489 clip_vcc->entry = NULL; 490 clip_vcc->xoff = 0; 491 clip_vcc->encap = 1; 492 clip_vcc->last_use = jiffies; 493 clip_vcc->idle_timeout = timeout*HZ; 494 clip_vcc->old_push = vcc->push; 495 clip_vcc->old_pop = vcc->pop; 496 vcc->push = clip_push; 497 vcc->pop = clip_pop; 498 skb_queue_head_init(©); 499 skb_migrate(&sk_atm(vcc)->sk_receive_queue, ©); 500 /* re-process everything received between connection setup and MKIP */ 501 while ((skb = skb_dequeue(©)) != NULL) 502 if (!clip_devs) { 503 atm_return(vcc,skb->truesize); 504 kfree_skb(skb); 505 } 506 else { 507 unsigned int len = skb->len; 508 509 clip_push(vcc,skb); 510 PRIV(skb->dev)->stats.rx_packets--; 511 PRIV(skb->dev)->stats.rx_bytes -= len; 512 } 513 return 0; 514 } 515 516 517 static int clip_setentry(struct atm_vcc *vcc,u32 ip) 518 { 519 struct neighbour *neigh; 520 struct atmarp_entry *entry; 521 int error; 522 struct clip_vcc *clip_vcc; 523 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1 } } }; 524 struct rtable *rt; 525 526 if (vcc->push != clip_push) { 527 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); 528 return -EBADF; 529 } 530 clip_vcc = CLIP_VCC(vcc); 531 if (!ip) { 532 if (!clip_vcc->entry) { 533 printk(KERN_ERR "hiding hidden ATMARP entry\n"); 534 return 0; 535 } 536 DPRINTK("setentry: remove\n"); 537 unlink_clip_vcc(clip_vcc); 538 return 0; 539 } 540 error = ip_route_output_key(&rt,&fl); 541 if (error) return error; 542 neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1); 543 ip_rt_put(rt); 544 if (!neigh) 545 return -ENOMEM; 546 entry = NEIGH2ENTRY(neigh); 547 if (entry != clip_vcc->entry) { 548 if (!clip_vcc->entry) DPRINTK("setentry: add\n"); 549 else { 550 DPRINTK("setentry: update\n"); 551 unlink_clip_vcc(clip_vcc); 552 } 553 link_vcc(clip_vcc,entry); 554 } 555 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 556 NEIGH_UPDATE_F_OVERRIDE|NEIGH_UPDATE_F_ADMIN); 557 neigh_release(neigh); 558 return error; 559 } 560 561 562 static void clip_setup(struct net_device *dev) 563 { 564 dev->hard_start_xmit = clip_start_xmit; 565 /* sg_xmit ... */ 566 dev->get_stats = clip_get_stats; 567 dev->type = ARPHRD_ATM; 568 dev->hard_header_len = RFC1483LLC_LEN; 569 dev->mtu = RFC1626_MTU; 570 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 571 /* When using a "real" qdisc, the qdisc determines the queue */ 572 /* length. tx_queue_len is only used for the default case, */ 573 /* without any more elaborate queuing. 100 is a reasonable */ 574 /* compromise between decent burst-tolerance and protection */ 575 /* against memory hogs. */ 576 } 577 578 579 static int clip_create(int number) 580 { 581 struct net_device *dev; 582 struct clip_priv *clip_priv; 583 int error; 584 585 if (number != -1) { 586 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 587 if (PRIV(dev)->number == number) return -EEXIST; 588 } 589 else { 590 number = 0; 591 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 592 if (PRIV(dev)->number >= number) 593 number = PRIV(dev)->number+1; 594 } 595 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); 596 if (!dev) 597 return -ENOMEM; 598 clip_priv = PRIV(dev); 599 sprintf(dev->name,"atm%d",number); 600 spin_lock_init(&clip_priv->xoff_lock); 601 clip_priv->number = number; 602 error = register_netdev(dev); 603 if (error) { 604 free_netdev(dev); 605 return error; 606 } 607 clip_priv->next = clip_devs; 608 clip_devs = dev; 609 DPRINTK("registered (net:%s)\n",dev->name); 610 return number; 611 } 612 613 614 static int clip_device_event(struct notifier_block *this,unsigned long event, 615 void *dev) 616 { 617 /* ignore non-CLIP devices */ 618 if (((struct net_device *) dev)->type != ARPHRD_ATM || 619 ((struct net_device *) dev)->hard_start_xmit != clip_start_xmit) 620 return NOTIFY_DONE; 621 switch (event) { 622 case NETDEV_UP: 623 DPRINTK("clip_device_event NETDEV_UP\n"); 624 (void) to_atmarpd(act_up,PRIV(dev)->number,0); 625 break; 626 case NETDEV_GOING_DOWN: 627 DPRINTK("clip_device_event NETDEV_DOWN\n"); 628 (void) to_atmarpd(act_down,PRIV(dev)->number,0); 629 break; 630 case NETDEV_CHANGE: 631 case NETDEV_CHANGEMTU: 632 DPRINTK("clip_device_event NETDEV_CHANGE*\n"); 633 (void) to_atmarpd(act_change,PRIV(dev)->number,0); 634 break; 635 case NETDEV_REBOOT: 636 case NETDEV_REGISTER: 637 case NETDEV_DOWN: 638 DPRINTK("clip_device_event %ld\n",event); 639 /* ignore */ 640 break; 641 default: 642 printk(KERN_WARNING "clip_device_event: unknown event " 643 "%ld\n",event); 644 break; 645 } 646 return NOTIFY_DONE; 647 } 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) return NOTIFY_DONE; 665 return clip_device_event(this,NETDEV_CHANGE,in_dev->dev); 666 } 667 668 669 static struct notifier_block clip_dev_notifier = { 670 clip_device_event, 671 NULL, 672 0 673 }; 674 675 676 677 static struct notifier_block clip_inet_notifier = { 678 clip_inet_event, 679 NULL, 680 0 681 }; 682 683 684 685 static void atmarpd_close(struct atm_vcc *vcc) 686 { 687 DPRINTK("atmarpd_close\n"); 688 atmarpd = NULL; /* assumed to be atomic */ 689 barrier(); 690 unregister_inetaddr_notifier(&clip_inet_notifier); 691 unregister_netdevice_notifier(&clip_dev_notifier); 692 if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) 693 printk(KERN_ERR "atmarpd_close: closing with requests " 694 "pending\n"); 695 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 696 DPRINTK("(done)\n"); 697 module_put(THIS_MODULE); 698 } 699 700 701 static struct atmdev_ops atmarpd_dev_ops = { 702 .close = atmarpd_close 703 }; 704 705 706 static struct atm_dev atmarpd_dev = { 707 .ops = &atmarpd_dev_ops, 708 .type = "arpd", 709 .number = 999, 710 .lock = SPIN_LOCK_UNLOCKED 711 }; 712 713 714 static int atm_init_atmarp(struct atm_vcc *vcc) 715 { 716 if (atmarpd) return -EADDRINUSE; 717 if (start_timer) { 718 start_timer = 0; 719 init_timer(&idle_timer); 720 idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ; 721 idle_timer.function = idle_timer_check; 722 add_timer(&idle_timer); 723 } 724 atmarpd = vcc; 725 set_bit(ATM_VF_META,&vcc->flags); 726 set_bit(ATM_VF_READY,&vcc->flags); 727 /* allow replies and avoid getting closed if signaling dies */ 728 vcc->dev = &atmarpd_dev; 729 vcc_insert_socket(sk_atm(vcc)); 730 vcc->push = NULL; 731 vcc->pop = NULL; /* crash */ 732 vcc->push_oam = NULL; /* crash */ 733 if (register_netdevice_notifier(&clip_dev_notifier)) 734 printk(KERN_ERR "register_netdevice_notifier failed\n"); 735 if (register_inetaddr_notifier(&clip_inet_notifier)) 736 printk(KERN_ERR "register_inetaddr_notifier failed\n"); 737 return 0; 738 } 739 740 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 741 { 742 struct atm_vcc *vcc = ATM_SD(sock); 743 int err = 0; 744 745 switch (cmd) { 746 case SIOCMKCLIP: 747 case ATMARPD_CTRL: 748 case ATMARP_MKIP: 749 case ATMARP_SETENTRY: 750 case ATMARP_ENCAP: 751 if (!capable(CAP_NET_ADMIN)) 752 return -EPERM; 753 break; 754 default: 755 return -ENOIOCTLCMD; 756 } 757 758 switch (cmd) { 759 case SIOCMKCLIP: 760 err = clip_create(arg); 761 break; 762 case ATMARPD_CTRL: 763 err = atm_init_atmarp(vcc); 764 if (!err) { 765 sock->state = SS_CONNECTED; 766 __module_get(THIS_MODULE); 767 } 768 break; 769 case ATMARP_MKIP: 770 err = clip_mkip(vcc ,arg); 771 break; 772 case ATMARP_SETENTRY: 773 err = clip_setentry(vcc, arg); 774 break; 775 case ATMARP_ENCAP: 776 err = clip_encap(vcc, arg); 777 break; 778 } 779 return err; 780 } 781 782 static struct atm_ioctl clip_ioctl_ops = { 783 .owner = THIS_MODULE, 784 .ioctl = clip_ioctl, 785 }; 786 787 #ifdef CONFIG_PROC_FS 788 789 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 790 { 791 static int code[] = { 1,2,10,6,1,0 }; 792 static int e164[] = { 1,8,4,6,1,0 }; 793 794 if (*addr->sas_addr.pub) { 795 seq_printf(seq, "%s", addr->sas_addr.pub); 796 if (*addr->sas_addr.prv) 797 seq_putc(seq, '+'); 798 } else if (!*addr->sas_addr.prv) { 799 seq_printf(seq, "%s", "(none)"); 800 return; 801 } 802 if (*addr->sas_addr.prv) { 803 unsigned char *prv = addr->sas_addr.prv; 804 int *fields; 805 int i, j; 806 807 fields = *prv == ATM_AFI_E164 ? e164 : code; 808 for (i = 0; fields[i]; i++) { 809 for (j = fields[i]; j; j--) 810 seq_printf(seq, "%02X", *prv++); 811 if (fields[i+1]) 812 seq_putc(seq, '.'); 813 } 814 } 815 } 816 817 /* This means the neighbour entry has no attached VCC objects. */ 818 #define SEQ_NO_VCC_TOKEN ((void *) 2) 819 820 static void atmarp_info(struct seq_file *seq, struct net_device *dev, 821 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 822 { 823 unsigned long exp; 824 char buf[17]; 825 int svc, llc, off; 826 827 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 828 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 829 830 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 831 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, 842 svc ? "SVC" : "PVC", 843 llc ? "LLC" : "NULL", 844 exp); 845 846 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", 847 NIPQUAD(entry->ip)); 848 while (off < 16) 849 buf[off++] = ' '; 850 buf[off] = '\0'; 851 seq_printf(seq, "%s", buf); 852 853 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 854 if (time_before(jiffies, entry->expires)) 855 seq_printf(seq, "(resolving)\n"); 856 else 857 seq_printf(seq, "(expired, ref %d)\n", 858 atomic_read(&entry->neigh->refcnt)); 859 } else if (!svc) { 860 seq_printf(seq, "%d.%d.%d\n", 861 clip_vcc->vcc->dev->number, 862 clip_vcc->vcc->vpi, 863 clip_vcc->vcc->vci); 864 } else { 865 svc_addr(seq, &clip_vcc->vcc->remote); 866 seq_putc(seq, '\n'); 867 } 868 } 869 870 struct clip_seq_state { 871 /* This member must be first. */ 872 struct neigh_seq_state ns; 873 874 /* Local to clip specific iteration. */ 875 struct clip_vcc *vcc; 876 }; 877 878 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 879 struct clip_vcc *curr) 880 { 881 if (!curr) { 882 curr = e->vccs; 883 if (!curr) 884 return SEQ_NO_VCC_TOKEN; 885 return curr; 886 } 887 if (curr == SEQ_NO_VCC_TOKEN) 888 return NULL; 889 890 curr = curr->next; 891 892 return curr; 893 } 894 895 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 896 struct atmarp_entry *e, loff_t *pos) 897 { 898 struct clip_vcc *vcc = state->vcc; 899 900 vcc = clip_seq_next_vcc(e, vcc); 901 if (vcc && pos != NULL) { 902 while (*pos) { 903 vcc = clip_seq_next_vcc(e, vcc); 904 if (!vcc) 905 break; 906 --(*pos); 907 } 908 } 909 state->vcc = vcc; 910 911 return vcc; 912 } 913 914 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 915 struct neighbour *n, loff_t *pos) 916 { 917 struct clip_seq_state *state = (struct clip_seq_state *) _state; 918 919 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); 920 } 921 922 static void *clip_seq_start(struct seq_file *seq, loff_t *pos) 923 { 924 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); 925 } 926 927 static int clip_seq_show(struct seq_file *seq, void *v) 928 { 929 static char atm_arp_banner[] = 930 "IPitf TypeEncp Idle IP address ATM address\n"; 931 932 if (v == SEQ_START_TOKEN) { 933 seq_puts(seq, atm_arp_banner); 934 } else { 935 struct clip_seq_state *state = seq->private; 936 struct neighbour *n = v; 937 struct clip_vcc *vcc = state->vcc; 938 939 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); 940 } 941 return 0; 942 } 943 944 static struct seq_operations arp_seq_ops = { 945 .start = clip_seq_start, 946 .next = neigh_seq_next, 947 .stop = neigh_seq_stop, 948 .show = clip_seq_show, 949 }; 950 951 static int arp_seq_open(struct inode *inode, struct file *file) 952 { 953 struct clip_seq_state *state; 954 struct seq_file *seq; 955 int rc = -EAGAIN; 956 957 state = kmalloc(sizeof(*state), GFP_KERNEL); 958 if (!state) { 959 rc = -ENOMEM; 960 goto out_kfree; 961 } 962 memset(state, 0, sizeof(*state)); 963 state->ns.neigh_sub_iter = clip_seq_sub_iter; 964 965 rc = seq_open(file, &arp_seq_ops); 966 if (rc) 967 goto out_kfree; 968 969 seq = file->private_data; 970 seq->private = state; 971 out: 972 return rc; 973 974 out_kfree: 975 kfree(state); 976 goto out; 977 } 978 979 static struct file_operations arp_seq_fops = { 980 .open = arp_seq_open, 981 .read = seq_read, 982 .llseek = seq_lseek, 983 .release = seq_release_private, 984 .owner = THIS_MODULE 985 }; 986 #endif 987 988 static int __init atm_clip_init(void) 989 { 990 neigh_table_init(&clip_tbl); 991 992 clip_tbl_hook = &clip_tbl; 993 register_atm_ioctl(&clip_ioctl_ops); 994 995 #ifdef CONFIG_PROC_FS 996 { 997 struct proc_dir_entry *p; 998 999 p = create_proc_entry("arp", S_IRUGO, atm_proc_root); 1000 if (p) 1001 p->proc_fops = &arp_seq_fops; 1002 } 1003 #endif 1004 1005 return 0; 1006 } 1007 1008 static void __exit atm_clip_exit(void) 1009 { 1010 struct net_device *dev, *next; 1011 1012 remove_proc_entry("arp", atm_proc_root); 1013 1014 deregister_atm_ioctl(&clip_ioctl_ops); 1015 1016 /* First, stop the idle timer, so it stops banging 1017 * on the table. 1018 */ 1019 if (start_timer == 0) 1020 del_timer(&idle_timer); 1021 1022 /* Next, purge the table, so that the device 1023 * unregister loop below does not hang due to 1024 * device references remaining in the table. 1025 */ 1026 neigh_ifdown(&clip_tbl, NULL); 1027 1028 dev = clip_devs; 1029 while (dev) { 1030 next = PRIV(dev)->next; 1031 unregister_netdev(dev); 1032 free_netdev(dev); 1033 dev = next; 1034 } 1035 1036 /* Now it is safe to fully shutdown whole table. */ 1037 neigh_table_clear(&clip_tbl); 1038 1039 clip_tbl_hook = NULL; 1040 } 1041 1042 module_init(atm_clip_init); 1043 module_exit(atm_clip_exit); 1044 1045 MODULE_LICENSE("GPL"); 1046