1 // SPDX-License-Identifier: GPL-2.0-only 2 /* net/atm/clip.c - RFC1577 Classical IP over ATM */ 3 4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 7 8 #include <linux/string.h> 9 #include <linux/errno.h> 10 #include <linux/kernel.h> /* for UINT_MAX */ 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/netdevice.h> 14 #include <linux/skbuff.h> 15 #include <linux/wait.h> 16 #include <linux/timer.h> 17 #include <linux/if_arp.h> /* for some manifest constants */ 18 #include <linux/notifier.h> 19 #include <linux/atm.h> 20 #include <linux/atmdev.h> 21 #include <linux/atmclip.h> 22 #include <linux/atmarp.h> 23 #include <linux/capability.h> 24 #include <linux/ip.h> /* for net/route.h */ 25 #include <linux/in.h> /* for struct sockaddr_in */ 26 #include <linux/if.h> /* for IFF_UP */ 27 #include <linux/inetdevice.h> 28 #include <linux/bitops.h> 29 #include <linux/poison.h> 30 #include <linux/proc_fs.h> 31 #include <linux/seq_file.h> 32 #include <linux/rcupdate.h> 33 #include <linux/jhash.h> 34 #include <linux/slab.h> 35 #include <net/route.h> /* for struct rtable and routing */ 36 #include <net/icmp.h> /* icmp_send */ 37 #include <net/arp.h> 38 #include <linux/param.h> /* for HZ */ 39 #include <linux/uaccess.h> 40 #include <asm/byteorder.h> /* for htons etc. */ 41 #include <linux/atomic.h> 42 43 #include "common.h" 44 #include "resources.h" 45 #include <net/atmclip.h> 46 47 static struct net_device *clip_devs; 48 static struct atm_vcc *atmarpd; 49 static struct timer_list idle_timer; 50 static const struct neigh_ops clip_neigh_ops; 51 52 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) 53 { 54 struct sock *sk; 55 struct atmarp_ctrl *ctrl; 56 struct sk_buff *skb; 57 58 pr_debug("(%d)\n", type); 59 if (!atmarpd) 60 return -EUNATCH; 61 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC); 62 if (!skb) 63 return -ENOMEM; 64 ctrl = skb_put(skb, sizeof(struct atmarp_ctrl)); 65 ctrl->type = type; 66 ctrl->itf_num = itf; 67 ctrl->ip = ip; 68 atm_force_charge(atmarpd, skb->truesize); 69 70 sk = sk_atm(atmarpd); 71 skb_queue_tail(&sk->sk_receive_queue, skb); 72 sk->sk_data_ready(sk); 73 return 0; 74 } 75 76 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) 77 { 78 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh); 79 clip_vcc->entry = entry; 80 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ 81 clip_vcc->next = entry->vccs; 82 entry->vccs = clip_vcc; 83 entry->neigh->used = jiffies; 84 } 85 86 static void unlink_clip_vcc(struct clip_vcc *clip_vcc) 87 { 88 struct atmarp_entry *entry = clip_vcc->entry; 89 struct clip_vcc **walk; 90 91 if (!entry) { 92 pr_err("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); 93 return; 94 } 95 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ 96 entry->neigh->used = jiffies; 97 for (walk = &entry->vccs; *walk; walk = &(*walk)->next) 98 if (*walk == clip_vcc) { 99 int error; 100 101 *walk = clip_vcc->next; /* atomic */ 102 clip_vcc->entry = NULL; 103 if (clip_vcc->xoff) 104 netif_wake_queue(entry->neigh->dev); 105 if (entry->vccs) 106 goto out; 107 entry->expires = jiffies - 1; 108 /* force resolution or expiration */ 109 error = neigh_update(entry->neigh, NULL, NUD_NONE, 110 NEIGH_UPDATE_F_ADMIN, 0); 111 if (error) 112 pr_err("neigh_update failed with %d\n", error); 113 goto out; 114 } 115 pr_err("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc); 116 out: 117 netif_tx_unlock_bh(entry->neigh->dev); 118 } 119 120 /* The neighbour entry n->lock is held. */ 121 static int neigh_check_cb(struct neighbour *n) 122 { 123 struct atmarp_entry *entry = neighbour_priv(n); 124 struct clip_vcc *cv; 125 126 if (n->ops != &clip_neigh_ops) 127 return 0; 128 for (cv = entry->vccs; cv; cv = cv->next) { 129 unsigned long exp = cv->last_use + cv->idle_timeout; 130 131 if (cv->idle_timeout && time_after(jiffies, exp)) { 132 pr_debug("releasing vcc %p->%p of entry %p\n", 133 cv, cv->vcc, entry); 134 vcc_release_async(cv->vcc, -ETIMEDOUT); 135 } 136 } 137 138 if (entry->vccs || time_before(jiffies, entry->expires)) 139 return 0; 140 141 if (refcount_read(&n->refcnt) > 1) { 142 struct sk_buff *skb; 143 144 pr_debug("destruction postponed with ref %d\n", 145 refcount_read(&n->refcnt)); 146 147 while ((skb = skb_dequeue(&n->arp_queue)) != NULL) 148 dev_kfree_skb(skb); 149 150 return 0; 151 } 152 153 pr_debug("expired neigh %p\n", n); 154 return 1; 155 } 156 157 static void idle_timer_check(struct timer_list *unused) 158 { 159 write_lock(&arp_tbl.lock); 160 __neigh_for_each_release(&arp_tbl, neigh_check_cb); 161 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 162 write_unlock(&arp_tbl.lock); 163 } 164 165 static int clip_arp_rcv(struct sk_buff *skb) 166 { 167 struct atm_vcc *vcc; 168 169 pr_debug("\n"); 170 vcc = ATM_SKB(skb)->vcc; 171 if (!vcc || !atm_charge(vcc, skb->truesize)) { 172 dev_kfree_skb_any(skb); 173 return 0; 174 } 175 pr_debug("pushing to %p\n", vcc); 176 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push); 177 CLIP_VCC(vcc)->old_push(vcc, skb); 178 return 0; 179 } 180 181 static const unsigned char llc_oui[] = { 182 0xaa, /* DSAP: non-ISO */ 183 0xaa, /* SSAP: non-ISO */ 184 0x03, /* Ctrl: Unnumbered Information Command PDU */ 185 0x00, /* OUI: EtherType */ 186 0x00, 187 0x00 188 }; 189 190 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) 191 { 192 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 193 194 pr_debug("\n"); 195 196 if (!clip_devs) { 197 atm_return(vcc, skb->truesize); 198 kfree_skb(skb); 199 return; 200 } 201 202 if (!skb) { 203 pr_debug("removing VCC %p\n", clip_vcc); 204 if (clip_vcc->entry) 205 unlink_clip_vcc(clip_vcc); 206 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ 207 kfree(clip_vcc); 208 return; 209 } 210 atm_return(vcc, skb->truesize); 211 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; 212 /* clip_vcc->entry == NULL if we don't have an IP address yet */ 213 if (!skb->dev) { 214 dev_kfree_skb_any(skb); 215 return; 216 } 217 ATM_SKB(skb)->vcc = vcc; 218 skb_reset_mac_header(skb); 219 if (!clip_vcc->encap || 220 skb->len < RFC1483LLC_LEN || 221 memcmp(skb->data, llc_oui, sizeof(llc_oui))) 222 skb->protocol = htons(ETH_P_IP); 223 else { 224 skb->protocol = ((__be16 *)skb->data)[3]; 225 skb_pull(skb, RFC1483LLC_LEN); 226 if (skb->protocol == htons(ETH_P_ARP)) { 227 skb->dev->stats.rx_packets++; 228 skb->dev->stats.rx_bytes += skb->len; 229 clip_arp_rcv(skb); 230 return; 231 } 232 } 233 clip_vcc->last_use = jiffies; 234 skb->dev->stats.rx_packets++; 235 skb->dev->stats.rx_bytes += skb->len; 236 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 237 netif_rx(skb); 238 } 239 240 /* 241 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that 242 * clip_pop is atomic with respect to the critical section in clip_start_xmit. 243 */ 244 245 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) 246 { 247 struct clip_vcc *clip_vcc = CLIP_VCC(vcc); 248 struct net_device *dev = skb->dev; 249 int old; 250 unsigned long flags; 251 252 pr_debug("(vcc %p)\n", vcc); 253 clip_vcc->old_pop(vcc, skb); 254 /* skb->dev == NULL in outbound ARP packets */ 255 if (!dev) 256 return; 257 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); 258 if (atm_may_send(vcc, 0)) { 259 old = xchg(&clip_vcc->xoff, 0); 260 if (old) 261 netif_wake_queue(dev); 262 } 263 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); 264 } 265 266 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) 267 { 268 __be32 *ip = (__be32 *) neigh->primary_key; 269 270 pr_debug("(neigh %p, skb %p)\n", neigh, skb); 271 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip); 272 } 273 274 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) 275 { 276 #ifndef CONFIG_ATM_CLIP_NO_ICMP 277 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 278 #endif 279 kfree_skb(skb); 280 } 281 282 static const struct neigh_ops clip_neigh_ops = { 283 .family = AF_INET, 284 .solicit = clip_neigh_solicit, 285 .error_report = clip_neigh_error, 286 .output = neigh_direct_output, 287 .connected_output = neigh_direct_output, 288 }; 289 290 static int clip_constructor(struct net_device *dev, struct neighbour *neigh) 291 { 292 struct atmarp_entry *entry = neighbour_priv(neigh); 293 294 if (neigh->tbl->family != AF_INET) 295 return -EINVAL; 296 297 if (neigh->type != RTN_UNICAST) 298 return -EINVAL; 299 300 neigh->nud_state = NUD_NONE; 301 neigh->ops = &clip_neigh_ops; 302 neigh->output = neigh->ops->output; 303 entry->neigh = neigh; 304 entry->vccs = NULL; 305 entry->expires = jiffies - 1; 306 307 return 0; 308 } 309 310 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ 311 312 /* 313 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means 314 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, 315 * don't increment the usage count. This is used to create entries in 316 * clip_setentry. 317 */ 318 319 static int clip_encap(struct atm_vcc *vcc, int mode) 320 { 321 if (!CLIP_VCC(vcc)) 322 return -EBADFD; 323 324 CLIP_VCC(vcc)->encap = mode; 325 return 0; 326 } 327 328 static netdev_tx_t clip_start_xmit(struct sk_buff *skb, 329 struct net_device *dev) 330 { 331 struct clip_priv *clip_priv = PRIV(dev); 332 struct dst_entry *dst = skb_dst(skb); 333 struct atmarp_entry *entry; 334 struct neighbour *n; 335 struct atm_vcc *vcc; 336 struct rtable *rt; 337 __be32 *daddr; 338 int old; 339 unsigned long flags; 340 341 pr_debug("(skb %p)\n", skb); 342 if (!dst) { 343 pr_err("skb_dst(skb) == NULL\n"); 344 dev_kfree_skb(skb); 345 dev->stats.tx_dropped++; 346 return NETDEV_TX_OK; 347 } 348 rt = (struct rtable *) dst; 349 if (rt->rt_gw_family == AF_INET) 350 daddr = &rt->rt_gw4; 351 else 352 daddr = &ip_hdr(skb)->daddr; 353 n = dst_neigh_lookup(dst, daddr); 354 if (!n) { 355 pr_err("NO NEIGHBOUR !\n"); 356 dev_kfree_skb(skb); 357 dev->stats.tx_dropped++; 358 return NETDEV_TX_OK; 359 } 360 entry = neighbour_priv(n); 361 if (!entry->vccs) { 362 if (time_after(jiffies, entry->expires)) { 363 /* should be resolved */ 364 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; 365 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key)); 366 } 367 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) 368 skb_queue_tail(&entry->neigh->arp_queue, skb); 369 else { 370 dev_kfree_skb(skb); 371 dev->stats.tx_dropped++; 372 } 373 goto out_release_neigh; 374 } 375 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); 376 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; 377 pr_debug("using neighbour %p, vcc %p\n", n, vcc); 378 if (entry->vccs->encap) { 379 void *here; 380 381 here = skb_push(skb, RFC1483LLC_LEN); 382 memcpy(here, llc_oui, sizeof(llc_oui)); 383 ((__be16 *) here)[3] = skb->protocol; 384 } 385 atm_account_tx(vcc, skb); 386 entry->vccs->last_use = jiffies; 387 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); 388 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ 389 if (old) { 390 pr_warn("XOFF->XOFF transition\n"); 391 goto out_release_neigh; 392 } 393 dev->stats.tx_packets++; 394 dev->stats.tx_bytes += skb->len; 395 vcc->send(vcc, skb); 396 if (atm_may_send(vcc, 0)) { 397 entry->vccs->xoff = 0; 398 goto out_release_neigh; 399 } 400 spin_lock_irqsave(&clip_priv->xoff_lock, flags); 401 netif_stop_queue(dev); /* XOFF -> throttle immediately */ 402 barrier(); 403 if (!entry->vccs->xoff) 404 netif_start_queue(dev); 405 /* Oh, we just raced with clip_pop. netif_start_queue should be 406 good enough, because nothing should really be asleep because 407 of the brief netif_stop_queue. If this isn't true or if it 408 changes, use netif_wake_queue instead. */ 409 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); 410 out_release_neigh: 411 neigh_release(n); 412 return NETDEV_TX_OK; 413 } 414 415 static int clip_mkip(struct atm_vcc *vcc, int timeout) 416 { 417 struct clip_vcc *clip_vcc; 418 419 if (!vcc->push) 420 return -EBADFD; 421 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); 422 if (!clip_vcc) 423 return -ENOMEM; 424 pr_debug("%p vcc %p\n", clip_vcc, vcc); 425 clip_vcc->vcc = vcc; 426 vcc->user_back = clip_vcc; 427 set_bit(ATM_VF_IS_CLIP, &vcc->flags); 428 clip_vcc->entry = NULL; 429 clip_vcc->xoff = 0; 430 clip_vcc->encap = 1; 431 clip_vcc->last_use = jiffies; 432 clip_vcc->idle_timeout = timeout * HZ; 433 clip_vcc->old_push = vcc->push; 434 clip_vcc->old_pop = vcc->pop; 435 vcc->push = clip_push; 436 vcc->pop = clip_pop; 437 438 /* re-process everything received between connection setup and MKIP */ 439 vcc_process_recv_queue(vcc); 440 441 return 0; 442 } 443 444 static int clip_setentry(struct atm_vcc *vcc, __be32 ip) 445 { 446 struct neighbour *neigh; 447 struct atmarp_entry *entry; 448 int error; 449 struct clip_vcc *clip_vcc; 450 struct rtable *rt; 451 452 if (vcc->push != clip_push) { 453 pr_warn("non-CLIP VCC\n"); 454 return -EBADF; 455 } 456 clip_vcc = CLIP_VCC(vcc); 457 if (!ip) { 458 if (!clip_vcc->entry) { 459 pr_err("hiding hidden ATMARP entry\n"); 460 return 0; 461 } 462 pr_debug("remove\n"); 463 unlink_clip_vcc(clip_vcc); 464 return 0; 465 } 466 rt = ip_route_output(&init_net, ip, 0, 1, 0); 467 if (IS_ERR(rt)) 468 return PTR_ERR(rt); 469 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1); 470 ip_rt_put(rt); 471 if (!neigh) 472 return -ENOMEM; 473 entry = neighbour_priv(neigh); 474 if (entry != clip_vcc->entry) { 475 if (!clip_vcc->entry) 476 pr_debug("add\n"); 477 else { 478 pr_debug("update\n"); 479 unlink_clip_vcc(clip_vcc); 480 } 481 link_vcc(clip_vcc, entry); 482 } 483 error = neigh_update(neigh, llc_oui, NUD_PERMANENT, 484 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, 0); 485 neigh_release(neigh); 486 return error; 487 } 488 489 static const struct net_device_ops clip_netdev_ops = { 490 .ndo_start_xmit = clip_start_xmit, 491 .ndo_neigh_construct = clip_constructor, 492 }; 493 494 static void clip_setup(struct net_device *dev) 495 { 496 dev->netdev_ops = &clip_netdev_ops; 497 dev->type = ARPHRD_ATM; 498 dev->neigh_priv_len = sizeof(struct atmarp_entry); 499 dev->hard_header_len = RFC1483LLC_LEN; 500 dev->mtu = RFC1626_MTU; 501 dev->tx_queue_len = 100; /* "normal" queue (packets) */ 502 /* When using a "real" qdisc, the qdisc determines the queue */ 503 /* length. tx_queue_len is only used for the default case, */ 504 /* without any more elaborate queuing. 100 is a reasonable */ 505 /* compromise between decent burst-tolerance and protection */ 506 /* against memory hogs. */ 507 netif_keep_dst(dev); 508 } 509 510 static int clip_create(int number) 511 { 512 struct net_device *dev; 513 struct clip_priv *clip_priv; 514 int error; 515 516 if (number != -1) { 517 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 518 if (PRIV(dev)->number == number) 519 return -EEXIST; 520 } else { 521 number = 0; 522 for (dev = clip_devs; dev; dev = PRIV(dev)->next) 523 if (PRIV(dev)->number >= number) 524 number = PRIV(dev)->number + 1; 525 } 526 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN, 527 clip_setup); 528 if (!dev) 529 return -ENOMEM; 530 clip_priv = PRIV(dev); 531 sprintf(dev->name, "atm%d", number); 532 spin_lock_init(&clip_priv->xoff_lock); 533 clip_priv->number = number; 534 error = register_netdev(dev); 535 if (error) { 536 free_netdev(dev); 537 return error; 538 } 539 clip_priv->next = clip_devs; 540 clip_devs = dev; 541 pr_debug("registered (net:%s)\n", dev->name); 542 return number; 543 } 544 545 static int clip_device_event(struct notifier_block *this, unsigned long event, 546 void *ptr) 547 { 548 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 549 550 if (!net_eq(dev_net(dev), &init_net)) 551 return NOTIFY_DONE; 552 553 if (event == NETDEV_UNREGISTER) 554 return NOTIFY_DONE; 555 556 /* ignore non-CLIP devices */ 557 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) 558 return NOTIFY_DONE; 559 560 switch (event) { 561 case NETDEV_UP: 562 pr_debug("NETDEV_UP\n"); 563 to_atmarpd(act_up, PRIV(dev)->number, 0); 564 break; 565 case NETDEV_GOING_DOWN: 566 pr_debug("NETDEV_DOWN\n"); 567 to_atmarpd(act_down, PRIV(dev)->number, 0); 568 break; 569 case NETDEV_CHANGE: 570 case NETDEV_CHANGEMTU: 571 pr_debug("NETDEV_CHANGE*\n"); 572 to_atmarpd(act_change, PRIV(dev)->number, 0); 573 break; 574 } 575 return NOTIFY_DONE; 576 } 577 578 static int clip_inet_event(struct notifier_block *this, unsigned long event, 579 void *ifa) 580 { 581 struct in_device *in_dev; 582 struct netdev_notifier_info info; 583 584 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; 585 /* 586 * Transitions are of the down-change-up type, so it's sufficient to 587 * handle the change on up. 588 */ 589 if (event != NETDEV_UP) 590 return NOTIFY_DONE; 591 netdev_notifier_info_init(&info, in_dev->dev); 592 return clip_device_event(this, NETDEV_CHANGE, &info); 593 } 594 595 static struct notifier_block clip_dev_notifier = { 596 .notifier_call = clip_device_event, 597 }; 598 599 600 601 static struct notifier_block clip_inet_notifier = { 602 .notifier_call = clip_inet_event, 603 }; 604 605 606 607 static void atmarpd_close(struct atm_vcc *vcc) 608 { 609 pr_debug("\n"); 610 611 rtnl_lock(); 612 atmarpd = NULL; 613 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); 614 rtnl_unlock(); 615 616 pr_debug("(done)\n"); 617 module_put(THIS_MODULE); 618 } 619 620 static const struct atmdev_ops atmarpd_dev_ops = { 621 .close = atmarpd_close 622 }; 623 624 625 static struct atm_dev atmarpd_dev = { 626 .ops = &atmarpd_dev_ops, 627 .type = "arpd", 628 .number = 999, 629 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) 630 }; 631 632 633 static int atm_init_atmarp(struct atm_vcc *vcc) 634 { 635 rtnl_lock(); 636 if (atmarpd) { 637 rtnl_unlock(); 638 return -EADDRINUSE; 639 } 640 641 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); 642 643 atmarpd = vcc; 644 set_bit(ATM_VF_META, &vcc->flags); 645 set_bit(ATM_VF_READY, &vcc->flags); 646 /* allow replies and avoid getting closed if signaling dies */ 647 vcc->dev = &atmarpd_dev; 648 vcc_insert_socket(sk_atm(vcc)); 649 vcc->push = NULL; 650 vcc->pop = NULL; /* crash */ 651 vcc->push_oam = NULL; /* crash */ 652 rtnl_unlock(); 653 return 0; 654 } 655 656 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 657 { 658 struct atm_vcc *vcc = ATM_SD(sock); 659 int err = 0; 660 661 switch (cmd) { 662 case SIOCMKCLIP: 663 case ATMARPD_CTRL: 664 case ATMARP_MKIP: 665 case ATMARP_SETENTRY: 666 case ATMARP_ENCAP: 667 if (!capable(CAP_NET_ADMIN)) 668 return -EPERM; 669 break; 670 default: 671 return -ENOIOCTLCMD; 672 } 673 674 switch (cmd) { 675 case SIOCMKCLIP: 676 err = clip_create(arg); 677 break; 678 case ATMARPD_CTRL: 679 err = atm_init_atmarp(vcc); 680 if (!err) { 681 sock->state = SS_CONNECTED; 682 __module_get(THIS_MODULE); 683 } 684 break; 685 case ATMARP_MKIP: 686 err = clip_mkip(vcc, arg); 687 break; 688 case ATMARP_SETENTRY: 689 err = clip_setentry(vcc, (__force __be32)arg); 690 break; 691 case ATMARP_ENCAP: 692 err = clip_encap(vcc, arg); 693 break; 694 } 695 return err; 696 } 697 698 static struct atm_ioctl clip_ioctl_ops = { 699 .owner = THIS_MODULE, 700 .ioctl = clip_ioctl, 701 }; 702 703 #ifdef CONFIG_PROC_FS 704 705 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) 706 { 707 static int code[] = { 1, 2, 10, 6, 1, 0 }; 708 static int e164[] = { 1, 8, 4, 6, 1, 0 }; 709 710 if (*addr->sas_addr.pub) { 711 seq_printf(seq, "%s", addr->sas_addr.pub); 712 if (*addr->sas_addr.prv) 713 seq_putc(seq, '+'); 714 } else if (!*addr->sas_addr.prv) { 715 seq_printf(seq, "%s", "(none)"); 716 return; 717 } 718 if (*addr->sas_addr.prv) { 719 unsigned char *prv = addr->sas_addr.prv; 720 int *fields; 721 int i, j; 722 723 fields = *prv == ATM_AFI_E164 ? e164 : code; 724 for (i = 0; fields[i]; i++) { 725 for (j = fields[i]; j; j--) 726 seq_printf(seq, "%02X", *prv++); 727 if (fields[i + 1]) 728 seq_putc(seq, '.'); 729 } 730 } 731 } 732 733 /* This means the neighbour entry has no attached VCC objects. */ 734 #define SEQ_NO_VCC_TOKEN ((void *) 2) 735 736 static void atmarp_info(struct seq_file *seq, struct neighbour *n, 737 struct atmarp_entry *entry, struct clip_vcc *clip_vcc) 738 { 739 struct net_device *dev = n->dev; 740 unsigned long exp; 741 char buf[17]; 742 int svc, llc, off; 743 744 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || 745 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); 746 747 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); 748 749 if (clip_vcc == SEQ_NO_VCC_TOKEN) 750 exp = entry->neigh->used; 751 else 752 exp = clip_vcc->last_use; 753 754 exp = (jiffies - exp) / HZ; 755 756 seq_printf(seq, "%-6s%-4s%-4s%5ld ", 757 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); 758 759 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key); 760 while (off < 16) 761 buf[off++] = ' '; 762 buf[off] = '\0'; 763 seq_printf(seq, "%s", buf); 764 765 if (clip_vcc == SEQ_NO_VCC_TOKEN) { 766 if (time_before(jiffies, entry->expires)) 767 seq_printf(seq, "(resolving)\n"); 768 else 769 seq_printf(seq, "(expired, ref %d)\n", 770 refcount_read(&entry->neigh->refcnt)); 771 } else if (!svc) { 772 seq_printf(seq, "%d.%d.%d\n", 773 clip_vcc->vcc->dev->number, 774 clip_vcc->vcc->vpi, clip_vcc->vcc->vci); 775 } else { 776 svc_addr(seq, &clip_vcc->vcc->remote); 777 seq_putc(seq, '\n'); 778 } 779 } 780 781 struct clip_seq_state { 782 /* This member must be first. */ 783 struct neigh_seq_state ns; 784 785 /* Local to clip specific iteration. */ 786 struct clip_vcc *vcc; 787 }; 788 789 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, 790 struct clip_vcc *curr) 791 { 792 if (!curr) { 793 curr = e->vccs; 794 if (!curr) 795 return SEQ_NO_VCC_TOKEN; 796 return curr; 797 } 798 if (curr == SEQ_NO_VCC_TOKEN) 799 return NULL; 800 801 curr = curr->next; 802 803 return curr; 804 } 805 806 static void *clip_seq_vcc_walk(struct clip_seq_state *state, 807 struct atmarp_entry *e, loff_t * pos) 808 { 809 struct clip_vcc *vcc = state->vcc; 810 811 vcc = clip_seq_next_vcc(e, vcc); 812 if (vcc && pos != NULL) { 813 while (*pos) { 814 vcc = clip_seq_next_vcc(e, vcc); 815 if (!vcc) 816 break; 817 --(*pos); 818 } 819 } 820 state->vcc = vcc; 821 822 return vcc; 823 } 824 825 static void *clip_seq_sub_iter(struct neigh_seq_state *_state, 826 struct neighbour *n, loff_t * pos) 827 { 828 struct clip_seq_state *state = (struct clip_seq_state *)_state; 829 830 if (n->dev->type != ARPHRD_ATM) 831 return NULL; 832 833 return clip_seq_vcc_walk(state, neighbour_priv(n), pos); 834 } 835 836 static void *clip_seq_start(struct seq_file *seq, loff_t * pos) 837 { 838 struct clip_seq_state *state = seq->private; 839 state->ns.neigh_sub_iter = clip_seq_sub_iter; 840 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY); 841 } 842 843 static int clip_seq_show(struct seq_file *seq, void *v) 844 { 845 static char atm_arp_banner[] = 846 "IPitf TypeEncp Idle IP address ATM address\n"; 847 848 if (v == SEQ_START_TOKEN) { 849 seq_puts(seq, atm_arp_banner); 850 } else { 851 struct clip_seq_state *state = seq->private; 852 struct clip_vcc *vcc = state->vcc; 853 struct neighbour *n = v; 854 855 atmarp_info(seq, n, neighbour_priv(n), vcc); 856 } 857 return 0; 858 } 859 860 static const struct seq_operations arp_seq_ops = { 861 .start = clip_seq_start, 862 .next = neigh_seq_next, 863 .stop = neigh_seq_stop, 864 .show = clip_seq_show, 865 }; 866 #endif 867 868 static void atm_clip_exit_noproc(void); 869 870 static int __init atm_clip_init(void) 871 { 872 register_atm_ioctl(&clip_ioctl_ops); 873 register_netdevice_notifier(&clip_dev_notifier); 874 register_inetaddr_notifier(&clip_inet_notifier); 875 876 timer_setup(&idle_timer, idle_timer_check, 0); 877 878 #ifdef CONFIG_PROC_FS 879 { 880 struct proc_dir_entry *p; 881 882 p = proc_create_net("arp", 0444, atm_proc_root, &arp_seq_ops, 883 sizeof(struct clip_seq_state)); 884 if (!p) { 885 pr_err("Unable to initialize /proc/net/atm/arp\n"); 886 atm_clip_exit_noproc(); 887 return -ENOMEM; 888 } 889 } 890 #endif 891 892 return 0; 893 } 894 895 static void atm_clip_exit_noproc(void) 896 { 897 struct net_device *dev, *next; 898 899 unregister_inetaddr_notifier(&clip_inet_notifier); 900 unregister_netdevice_notifier(&clip_dev_notifier); 901 902 deregister_atm_ioctl(&clip_ioctl_ops); 903 904 /* First, stop the idle timer, so it stops banging 905 * on the table. 906 */ 907 del_timer_sync(&idle_timer); 908 909 dev = clip_devs; 910 while (dev) { 911 next = PRIV(dev)->next; 912 unregister_netdev(dev); 913 free_netdev(dev); 914 dev = next; 915 } 916 } 917 918 static void __exit atm_clip_exit(void) 919 { 920 remove_proc_entry("arp", atm_proc_root); 921 922 atm_clip_exit_noproc(); 923 } 924 925 module_init(atm_clip_init); 926 module_exit(atm_clip_exit); 927 MODULE_AUTHOR("Werner Almesberger"); 928 MODULE_DESCRIPTION("Classical/IP over ATM interface"); 929 MODULE_LICENSE("GPL"); 930