1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * lec.c: Lan Emulation driver 4 * 5 * Marko Kiiskila <mkiiskila@yahoo.com> 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 9 10 #include <linux/slab.h> 11 #include <linux/kernel.h> 12 #include <linux/bitops.h> 13 #include <linux/capability.h> 14 15 /* We are ethernet device */ 16 #include <linux/if_ether.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <net/sock.h> 20 #include <linux/skbuff.h> 21 #include <linux/ip.h> 22 #include <asm/byteorder.h> 23 #include <linux/uaccess.h> 24 #include <net/arp.h> 25 #include <net/dst.h> 26 #include <linux/proc_fs.h> 27 #include <linux/spinlock.h> 28 #include <linux/seq_file.h> 29 30 /* And atm device */ 31 #include <linux/atmdev.h> 32 #include <linux/atmlec.h> 33 34 /* Proxy LEC knows about bridging */ 35 #if IS_ENABLED(CONFIG_BRIDGE) 36 #include "../bridge/br_private.h" 37 38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 }; 39 #endif 40 41 /* Modular too */ 42 #include <linux/module.h> 43 #include <linux/init.h> 44 45 /* Hardening for Spectre-v1 */ 46 #include <linux/nospec.h> 47 48 #include "lec.h" 49 #include "lec_arpc.h" 50 #include "resources.h" 51 52 #define DUMP_PACKETS 0 /* 53 * 0 = None, 54 * 1 = 30 first bytes 55 * 2 = Whole packet 56 */ 57 58 #define LEC_UNRES_QUE_LEN 8 /* 59 * number of tx packets to queue for a 60 * single destination while waiting for SVC 61 */ 62 63 static int lec_open(struct net_device *dev); 64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 65 struct net_device *dev); 66 static int lec_close(struct net_device *dev); 67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 68 const unsigned char *mac_addr); 69 static int lec_arp_remove(struct lec_priv *priv, 70 struct lec_arp_table *to_remove); 71 /* LANE2 functions */ 72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address, 73 const u8 *tlvs, u32 sizeoftlvs); 74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 75 u8 **tlvs, u32 *sizeoftlvs); 76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 77 const u8 *tlvs, u32 sizeoftlvs); 78 79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 80 unsigned long permanent); 81 static void lec_arp_check_empties(struct lec_priv *priv, 82 struct atm_vcc *vcc, struct sk_buff *skb); 83 static void lec_arp_destroy(struct lec_priv *priv); 84 static void lec_arp_init(struct lec_priv *priv); 85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 86 const unsigned char *mac_to_find, 87 int is_rdesc, 88 struct lec_arp_table **ret_entry); 89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 90 const unsigned char *atm_addr, 91 unsigned long remoteflag, 92 unsigned int targetless_le_arp); 93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id); 94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc); 95 static void lec_set_flush_tran_id(struct lec_priv *priv, 96 const unsigned char *atm_addr, 97 unsigned long tran_id); 98 static void lec_vcc_added(struct lec_priv *priv, 99 const struct atmlec_ioc *ioc_data, 100 struct atm_vcc *vcc, 101 void (*old_push)(struct atm_vcc *vcc, 102 struct sk_buff *skb)); 103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc); 104 105 /* must be done under lec_arp_lock */ 106 static inline void lec_arp_hold(struct lec_arp_table *entry) 107 { 108 refcount_inc(&entry->usage); 109 } 110 111 static inline void lec_arp_put(struct lec_arp_table *entry) 112 { 113 if (refcount_dec_and_test(&entry->usage)) 114 kfree(entry); 115 } 116 117 static struct lane2_ops lane2_ops = { 118 .resolve = lane2_resolve, /* spec 3.1.3 */ 119 .associate_req = lane2_associate_req, /* spec 3.1.4 */ 120 .associate_indicator = NULL /* spec 3.1.5 */ 121 }; 122 123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 124 125 /* Device structures */ 126 static struct net_device *dev_lec[MAX_LEC_ITF]; 127 static DEFINE_MUTEX(lec_mutex); 128 129 #if IS_ENABLED(CONFIG_BRIDGE) 130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev) 131 { 132 char *buff; 133 struct lec_priv *priv; 134 135 /* 136 * Check if this is a BPDU. If so, ask zeppelin to send 137 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit 138 * as the Config BPDU has 139 */ 140 buff = skb->data + skb->dev->hard_header_len; 141 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) { 142 struct sock *sk; 143 struct sk_buff *skb2; 144 struct atmlec_msg *mesg; 145 146 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 147 if (skb2 == NULL) 148 return; 149 skb2->len = sizeof(struct atmlec_msg); 150 mesg = (struct atmlec_msg *)skb2->data; 151 mesg->type = l_topology_change; 152 buff += 4; 153 mesg->content.normal.flag = *buff & 0x01; 154 /* 0x01 is topology change */ 155 156 priv = netdev_priv(dev); 157 struct atm_vcc *vcc; 158 159 rcu_read_lock(); 160 vcc = rcu_dereference(priv->lecd); 161 if (vcc) { 162 atm_force_charge(vcc, skb2->truesize); 163 sk = sk_atm(vcc); 164 skb_queue_tail(&sk->sk_receive_queue, skb2); 165 sk->sk_data_ready(sk); 166 } else { 167 dev_kfree_skb(skb2); 168 } 169 rcu_read_unlock(); 170 } 171 } 172 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 173 174 /* 175 * Open/initialize the netdevice. This is called (in the current kernel) 176 * sometime after booting when the 'ifconfig' program is run. 177 * 178 * This routine should set everything up anew at each open, even 179 * registers that "should" only need to be set once at boot, so that 180 * there is non-reboot way to recover if something goes wrong. 181 */ 182 183 static int lec_open(struct net_device *dev) 184 { 185 netif_start_queue(dev); 186 187 return 0; 188 } 189 190 static void 191 lec_send(struct atm_vcc *vcc, struct sk_buff *skb) 192 { 193 struct net_device *dev = skb->dev; 194 unsigned int len = skb->len; 195 196 ATM_SKB(skb)->vcc = vcc; 197 atm_account_tx(vcc, skb); 198 199 if (vcc->send(vcc, skb) < 0) { 200 dev->stats.tx_dropped++; 201 return; 202 } 203 204 dev->stats.tx_packets++; 205 dev->stats.tx_bytes += len; 206 } 207 208 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue) 209 { 210 pr_info("%s\n", dev->name); 211 netif_trans_update(dev); 212 netif_wake_queue(dev); 213 } 214 215 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 216 struct net_device *dev) 217 { 218 struct sk_buff *skb2; 219 struct lec_priv *priv = netdev_priv(dev); 220 struct lecdatahdr_8023 *lec_h; 221 struct atm_vcc *vcc; 222 struct lec_arp_table *entry; 223 unsigned char *dst; 224 int min_frame_size; 225 int is_rdesc; 226 227 pr_debug("called\n"); 228 if (!rcu_access_pointer(priv->lecd)) { 229 pr_info("%s:No lecd attached\n", dev->name); 230 dev->stats.tx_errors++; 231 netif_stop_queue(dev); 232 kfree_skb(skb); 233 return NETDEV_TX_OK; 234 } 235 236 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n", 237 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb), 238 (long)skb_end_pointer(skb)); 239 #if IS_ENABLED(CONFIG_BRIDGE) 240 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) 241 lec_handle_bridge(skb, dev); 242 #endif 243 244 /* Make sure we have room for lec_id */ 245 if (skb_headroom(skb) < 2) { 246 pr_debug("reallocating skb\n"); 247 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 248 if (unlikely(!skb2)) { 249 kfree_skb(skb); 250 return NETDEV_TX_OK; 251 } 252 consume_skb(skb); 253 skb = skb2; 254 } 255 skb_push(skb, 2); 256 257 /* Put le header to place */ 258 lec_h = (struct lecdatahdr_8023 *)skb->data; 259 lec_h->le_header = htons(priv->lecid); 260 261 #if DUMP_PACKETS >= 2 262 #define MAX_DUMP_SKB 99 263 #elif DUMP_PACKETS >= 1 264 #define MAX_DUMP_SKB 30 265 #endif 266 #if DUMP_PACKETS >= 1 267 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n", 268 dev->name, skb->len, priv->lecid); 269 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 270 skb->data, min(skb->len, MAX_DUMP_SKB), true); 271 #endif /* DUMP_PACKETS >= 1 */ 272 273 /* Minimum ethernet-frame size */ 274 min_frame_size = LEC_MINIMUM_8023_SIZE; 275 if (skb->len < min_frame_size) { 276 if ((skb->len + skb_tailroom(skb)) < min_frame_size) { 277 skb2 = skb_copy_expand(skb, 0, 278 min_frame_size - skb->truesize, 279 GFP_ATOMIC); 280 dev_kfree_skb(skb); 281 if (skb2 == NULL) { 282 dev->stats.tx_dropped++; 283 return NETDEV_TX_OK; 284 } 285 skb = skb2; 286 } 287 skb_put(skb, min_frame_size - skb->len); 288 } 289 290 /* Send to right vcc */ 291 is_rdesc = 0; 292 dst = lec_h->h_dest; 293 entry = NULL; 294 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); 295 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", 296 dev->name, vcc, vcc ? vcc->flags : 0, entry); 297 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) { 298 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { 299 pr_debug("%s:queuing packet, MAC address %pM\n", 300 dev->name, lec_h->h_dest); 301 skb_queue_tail(&entry->tx_wait, skb); 302 } else { 303 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n", 304 dev->name, lec_h->h_dest); 305 dev->stats.tx_dropped++; 306 dev_kfree_skb(skb); 307 } 308 goto out; 309 } 310 #if DUMP_PACKETS > 0 311 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n", 312 dev->name, vcc->vpi, vcc->vci); 313 #endif /* DUMP_PACKETS > 0 */ 314 315 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { 316 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest); 317 lec_send(vcc, skb2); 318 } 319 320 lec_send(vcc, skb); 321 322 if (!atm_may_send(vcc, 0)) { 323 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 324 325 vpriv->xoff = 1; 326 netif_stop_queue(dev); 327 328 /* 329 * vcc->pop() might have occurred in between, making 330 * the vcc usuable again. Since xmit is serialized, 331 * this is the only situation we have to re-test. 332 */ 333 334 if (atm_may_send(vcc, 0)) 335 netif_wake_queue(dev); 336 } 337 338 out: 339 if (entry) 340 lec_arp_put(entry); 341 netif_trans_update(dev); 342 return NETDEV_TX_OK; 343 } 344 345 /* The inverse routine to net_open(). */ 346 static int lec_close(struct net_device *dev) 347 { 348 netif_stop_queue(dev); 349 return 0; 350 } 351 352 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 353 { 354 static const u8 zero_addr[ETH_ALEN] = {}; 355 unsigned long flags; 356 struct net_device *dev = (struct net_device *)vcc->proto_data; 357 struct lec_priv *priv = netdev_priv(dev); 358 struct atmlec_msg *mesg; 359 struct lec_arp_table *entry; 360 char *tmp; /* FIXME */ 361 362 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); 363 mesg = (struct atmlec_msg *)skb->data; 364 tmp = skb->data; 365 tmp += sizeof(struct atmlec_msg); 366 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type); 367 switch (mesg->type) { 368 case l_set_mac_addr: 369 eth_hw_addr_set(dev, mesg->content.normal.mac_addr); 370 break; 371 case l_del_mac_addr: 372 eth_hw_addr_set(dev, zero_addr); 373 break; 374 case l_addr_delete: 375 lec_addr_delete(priv, mesg->content.normal.atm_addr, 376 mesg->content.normal.flag); 377 break; 378 case l_topology_change: 379 priv->topology_change = mesg->content.normal.flag; 380 break; 381 case l_flush_complete: 382 lec_flush_complete(priv, mesg->content.normal.flag); 383 break; 384 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ 385 spin_lock_irqsave(&priv->lec_arp_lock, flags); 386 entry = lec_arp_find(priv, mesg->content.normal.mac_addr); 387 lec_arp_remove(priv, entry); 388 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 389 390 if (mesg->content.normal.no_source_le_narp) 391 break; 392 fallthrough; 393 case l_arp_update: 394 lec_arp_update(priv, mesg->content.normal.mac_addr, 395 mesg->content.normal.atm_addr, 396 mesg->content.normal.flag, 397 mesg->content.normal.targetless_le_arp); 398 pr_debug("in l_arp_update\n"); 399 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ 400 pr_debug("LANE2 3.1.5, got tlvs, size %d\n", 401 mesg->sizeoftlvs); 402 lane2_associate_ind(dev, mesg->content.normal.mac_addr, 403 tmp, mesg->sizeoftlvs); 404 } 405 break; 406 case l_config: 407 priv->maximum_unknown_frame_count = 408 mesg->content.config.maximum_unknown_frame_count; 409 priv->max_unknown_frame_time = 410 (mesg->content.config.max_unknown_frame_time * HZ); 411 priv->max_retry_count = mesg->content.config.max_retry_count; 412 priv->aging_time = (mesg->content.config.aging_time * HZ); 413 priv->forward_delay_time = 414 (mesg->content.config.forward_delay_time * HZ); 415 priv->arp_response_time = 416 (mesg->content.config.arp_response_time * HZ); 417 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ); 418 priv->path_switching_delay = 419 (mesg->content.config.path_switching_delay * HZ); 420 priv->lane_version = mesg->content.config.lane_version; 421 /* LANE2 */ 422 priv->lane2_ops = NULL; 423 if (priv->lane_version > 1) 424 priv->lane2_ops = &lane2_ops; 425 rtnl_lock(); 426 if (dev_set_mtu(dev, mesg->content.config.mtu)) 427 pr_info("%s: change_mtu to %d failed\n", 428 dev->name, mesg->content.config.mtu); 429 rtnl_unlock(); 430 priv->is_proxy = mesg->content.config.is_proxy; 431 break; 432 case l_flush_tran_id: 433 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, 434 mesg->content.normal.flag); 435 break; 436 case l_set_lecid: 437 priv->lecid = 438 (unsigned short)(0xffff & mesg->content.normal.flag); 439 break; 440 case l_should_bridge: 441 #if IS_ENABLED(CONFIG_BRIDGE) 442 { 443 pr_debug("%s: bridge zeppelin asks about %pM\n", 444 dev->name, mesg->content.proxy.mac_addr); 445 446 if (br_fdb_test_addr_hook == NULL) 447 break; 448 449 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) { 450 /* hit from bridge table, send LE_ARP_RESPONSE */ 451 struct sk_buff *skb2; 452 struct sock *sk; 453 454 pr_debug("%s: entry found, responding to zeppelin\n", 455 dev->name); 456 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 457 if (skb2 == NULL) 458 break; 459 skb2->len = sizeof(struct atmlec_msg); 460 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg)); 461 struct atm_vcc *vcc; 462 463 rcu_read_lock(); 464 vcc = rcu_dereference(priv->lecd); 465 if (vcc) { 466 atm_force_charge(vcc, skb2->truesize); 467 sk = sk_atm(vcc); 468 skb_queue_tail(&sk->sk_receive_queue, skb2); 469 sk->sk_data_ready(sk); 470 } else { 471 dev_kfree_skb(skb2); 472 } 473 rcu_read_unlock(); 474 } 475 } 476 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 477 break; 478 default: 479 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type); 480 dev_kfree_skb(skb); 481 return -EINVAL; 482 } 483 dev_kfree_skb(skb); 484 return 0; 485 } 486 487 static void lec_atm_close(struct atm_vcc *vcc) 488 { 489 struct net_device *dev = (struct net_device *)vcc->proto_data; 490 struct lec_priv *priv = netdev_priv(dev); 491 492 rcu_assign_pointer(priv->lecd, NULL); 493 synchronize_rcu(); 494 /* Do something needful? */ 495 496 netif_stop_queue(dev); 497 lec_arp_destroy(priv); 498 499 pr_info("%s: Shut down!\n", dev->name); 500 module_put(THIS_MODULE); 501 } 502 503 static const struct atmdev_ops lecdev_ops = { 504 .close = lec_atm_close, 505 .send = lec_atm_send 506 }; 507 508 static struct atm_dev lecatm_dev = { 509 .ops = &lecdev_ops, 510 .type = "lec", 511 .number = 999, /* dummy device number */ 512 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock) 513 }; 514 515 /* 516 * LANE2: new argument struct sk_buff *data contains 517 * the LE_ARP based TLVs introduced in the LANE2 spec 518 */ 519 static int 520 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 521 const unsigned char *mac_addr, const unsigned char *atm_addr, 522 struct sk_buff *data) 523 { 524 struct atm_vcc *vcc; 525 struct sock *sk; 526 struct sk_buff *skb; 527 struct atmlec_msg *mesg; 528 529 if (!priv || !rcu_access_pointer(priv->lecd)) 530 return -1; 531 532 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 533 if (!skb) 534 return -1; 535 skb->len = sizeof(struct atmlec_msg); 536 mesg = (struct atmlec_msg *)skb->data; 537 memset(mesg, 0, sizeof(struct atmlec_msg)); 538 mesg->type = type; 539 if (data != NULL) 540 mesg->sizeoftlvs = data->len; 541 if (mac_addr) 542 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr); 543 else 544 mesg->content.normal.targetless_le_arp = 1; 545 if (atm_addr) 546 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); 547 548 rcu_read_lock(); 549 vcc = rcu_dereference(priv->lecd); 550 if (!vcc) { 551 rcu_read_unlock(); 552 kfree_skb(skb); 553 return -1; 554 } 555 556 atm_force_charge(vcc, skb->truesize); 557 sk = sk_atm(vcc); 558 skb_queue_tail(&sk->sk_receive_queue, skb); 559 sk->sk_data_ready(sk); 560 561 if (data != NULL) { 562 pr_debug("about to send %d bytes of data\n", data->len); 563 atm_force_charge(vcc, data->truesize); 564 skb_queue_tail(&sk->sk_receive_queue, data); 565 sk->sk_data_ready(sk); 566 } 567 568 rcu_read_unlock(); 569 return 0; 570 } 571 572 static void lec_set_multicast_list(struct net_device *dev) 573 { 574 /* 575 * by default, all multicast frames arrive over the bus. 576 * eventually support selective multicast service 577 */ 578 } 579 580 static const struct net_device_ops lec_netdev_ops = { 581 .ndo_open = lec_open, 582 .ndo_stop = lec_close, 583 .ndo_start_xmit = lec_start_xmit, 584 .ndo_tx_timeout = lec_tx_timeout, 585 .ndo_set_rx_mode = lec_set_multicast_list, 586 }; 587 588 static const unsigned char lec_ctrl_magic[] = { 589 0xff, 590 0x00, 591 0x01, 592 0x01 593 }; 594 595 #define LEC_DATA_DIRECT_8023 2 596 #define LEC_DATA_DIRECT_8025 3 597 598 static int lec_is_data_direct(struct atm_vcc *vcc) 599 { 600 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) || 601 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025)); 602 } 603 604 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb) 605 { 606 unsigned long flags; 607 struct net_device *dev = (struct net_device *)vcc->proto_data; 608 struct lec_priv *priv = netdev_priv(dev); 609 610 #if DUMP_PACKETS > 0 611 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n", 612 dev->name, vcc->vpi, vcc->vci); 613 #endif 614 if (!skb) { 615 pr_debug("%s: null skb\n", dev->name); 616 lec_vcc_close(priv, vcc); 617 return; 618 } 619 #if DUMP_PACKETS >= 2 620 #define MAX_SKB_DUMP 99 621 #elif DUMP_PACKETS >= 1 622 #define MAX_SKB_DUMP 30 623 #endif 624 #if DUMP_PACKETS > 0 625 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n", 626 dev->name, skb->len, priv->lecid); 627 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 628 skb->data, min(MAX_SKB_DUMP, skb->len), true); 629 #endif /* DUMP_PACKETS > 0 */ 630 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { 631 /* Control frame, to daemon */ 632 struct sock *sk = sk_atm(vcc); 633 634 pr_debug("%s: To daemon\n", dev->name); 635 skb_queue_tail(&sk->sk_receive_queue, skb); 636 sk->sk_data_ready(sk); 637 } else { /* Data frame, queue to protocol handlers */ 638 struct lec_arp_table *entry; 639 unsigned char *src, *dst; 640 641 atm_return(vcc, skb->truesize); 642 if (*(__be16 *) skb->data == htons(priv->lecid) || 643 !rcu_access_pointer(priv->lecd) || !(dev->flags & IFF_UP)) { 644 /* 645 * Probably looping back, or if lecd is missing, 646 * lecd has gone down 647 */ 648 pr_debug("Ignoring frame...\n"); 649 dev_kfree_skb(skb); 650 return; 651 } 652 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; 653 654 /* 655 * If this is a Data Direct VCC, and the VCC does not match 656 * the LE_ARP cache entry, delete the LE_ARP cache entry. 657 */ 658 spin_lock_irqsave(&priv->lec_arp_lock, flags); 659 if (lec_is_data_direct(vcc)) { 660 src = ((struct lecdatahdr_8023 *)skb->data)->h_source; 661 entry = lec_arp_find(priv, src); 662 if (entry && entry->vcc != vcc) { 663 lec_arp_remove(priv, entry); 664 lec_arp_put(entry); 665 } 666 } 667 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 668 669 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */ 670 !priv->is_proxy && /* Proxy wants all the packets */ 671 memcmp(dst, dev->dev_addr, dev->addr_len)) { 672 dev_kfree_skb(skb); 673 return; 674 } 675 if (!hlist_empty(&priv->lec_arp_empty_ones)) 676 lec_arp_check_empties(priv, vcc, skb); 677 skb_pull(skb, 2); /* skip lec_id */ 678 skb->protocol = eth_type_trans(skb, dev); 679 dev->stats.rx_packets++; 680 dev->stats.rx_bytes += skb->len; 681 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 682 netif_rx(skb); 683 } 684 } 685 686 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) 687 { 688 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 689 struct net_device *dev = skb->dev; 690 691 if (vpriv == NULL) { 692 pr_info("vpriv = NULL!?!?!?\n"); 693 return; 694 } 695 696 vpriv->old_pop(vcc, skb); 697 698 if (vpriv->xoff && atm_may_send(vcc, 0)) { 699 vpriv->xoff = 0; 700 if (netif_running(dev) && netif_queue_stopped(dev)) 701 netif_wake_queue(dev); 702 } 703 } 704 705 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) 706 { 707 struct lec_vcc_priv *vpriv; 708 int bytes_left; 709 struct atmlec_ioc ioc_data; 710 711 lockdep_assert_held(&lec_mutex); 712 /* Lecd must be up in this case */ 713 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); 714 if (bytes_left != 0) 715 pr_info("copy from user failed for %d bytes\n", bytes_left); 716 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 717 return -EINVAL; 718 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF); 719 if (!dev_lec[ioc_data.dev_num]) 720 return -EINVAL; 721 vpriv = kmalloc_obj(struct lec_vcc_priv); 722 if (!vpriv) 723 return -ENOMEM; 724 vpriv->xoff = 0; 725 vpriv->old_pop = vcc->pop; 726 vcc->user_back = vpriv; 727 vcc->pop = lec_pop; 728 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]), 729 &ioc_data, vcc, vcc->push); 730 vcc->proto_data = dev_lec[ioc_data.dev_num]; 731 vcc->push = lec_push; 732 return 0; 733 } 734 735 static int lec_mcast_attach(struct atm_vcc *vcc, int arg) 736 { 737 lockdep_assert_held(&lec_mutex); 738 if (arg < 0 || arg >= MAX_LEC_ITF) 739 return -EINVAL; 740 arg = array_index_nospec(arg, MAX_LEC_ITF); 741 if (!dev_lec[arg]) 742 return -EINVAL; 743 vcc->proto_data = dev_lec[arg]; 744 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc); 745 } 746 747 /* Initialize device. */ 748 static int lecd_attach(struct atm_vcc *vcc, int arg) 749 { 750 int i; 751 struct lec_priv *priv; 752 753 lockdep_assert_held(&lec_mutex); 754 if (arg < 0) 755 arg = 0; 756 if (arg >= MAX_LEC_ITF) 757 return -EINVAL; 758 i = array_index_nospec(arg, MAX_LEC_ITF); 759 if (!dev_lec[i]) { 760 int size; 761 762 size = sizeof(struct lec_priv); 763 dev_lec[i] = alloc_etherdev(size); 764 if (!dev_lec[i]) 765 return -ENOMEM; 766 dev_lec[i]->netdev_ops = &lec_netdev_ops; 767 dev_lec[i]->max_mtu = 18190; 768 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 769 if (register_netdev(dev_lec[i])) { 770 free_netdev(dev_lec[i]); 771 dev_lec[i] = NULL; 772 return -EINVAL; 773 } 774 775 priv = netdev_priv(dev_lec[i]); 776 } else { 777 priv = netdev_priv(dev_lec[i]); 778 if (rcu_access_pointer(priv->lecd)) 779 return -EADDRINUSE; 780 } 781 lec_arp_init(priv); 782 priv->itfnum = i; /* LANE2 addition */ 783 rcu_assign_pointer(priv->lecd, vcc); 784 vcc->dev = &lecatm_dev; 785 vcc_insert_socket(sk_atm(vcc)); 786 787 vcc->proto_data = dev_lec[i]; 788 set_bit(ATM_VF_META, &vcc->flags); 789 set_bit(ATM_VF_READY, &vcc->flags); 790 791 /* Set default values to these variables */ 792 priv->maximum_unknown_frame_count = 1; 793 priv->max_unknown_frame_time = (1 * HZ); 794 priv->vcc_timeout_period = (1200 * HZ); 795 priv->max_retry_count = 1; 796 priv->aging_time = (300 * HZ); 797 priv->forward_delay_time = (15 * HZ); 798 priv->topology_change = 0; 799 priv->arp_response_time = (1 * HZ); 800 priv->flush_timeout = (4 * HZ); 801 priv->path_switching_delay = (6 * HZ); 802 803 if (dev_lec[i]->flags & IFF_UP) 804 netif_start_queue(dev_lec[i]); 805 __module_get(THIS_MODULE); 806 return i; 807 } 808 809 #ifdef CONFIG_PROC_FS 810 static const char *lec_arp_get_status_string(unsigned char status) 811 { 812 static const char *const lec_arp_status_string[] = { 813 "ESI_UNKNOWN ", 814 "ESI_ARP_PENDING ", 815 "ESI_VC_PENDING ", 816 "<Undefined> ", 817 "ESI_FLUSH_PENDING ", 818 "ESI_FORWARD_DIRECT" 819 }; 820 821 if (status > ESI_FORWARD_DIRECT) 822 status = 3; /* ESI_UNDEFINED */ 823 return lec_arp_status_string[status]; 824 } 825 826 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 827 { 828 seq_printf(seq, "%pM ", entry->mac_addr); 829 seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr); 830 seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status), 831 entry->flags & 0xffff); 832 if (entry->vcc) 833 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 834 else 835 seq_printf(seq, " "); 836 if (entry->recv_vcc) { 837 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 838 entry->recv_vcc->vci); 839 } 840 seq_putc(seq, '\n'); 841 } 842 843 struct lec_state { 844 unsigned long flags; 845 struct lec_priv *locked; 846 struct hlist_node *node; 847 struct net_device *dev; 848 int itf; 849 int arp_table; 850 int misc_table; 851 }; 852 853 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 854 loff_t *l) 855 { 856 struct hlist_node *e = state->node; 857 858 if (!e) 859 e = tbl->first; 860 if (e == SEQ_START_TOKEN) { 861 e = tbl->first; 862 --*l; 863 } 864 865 for (; e; e = e->next) { 866 if (--*l < 0) 867 break; 868 } 869 state->node = e; 870 871 return (*l < 0) ? state : NULL; 872 } 873 874 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 875 struct lec_priv *priv) 876 { 877 void *v = NULL; 878 int p; 879 880 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 881 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 882 if (v) 883 break; 884 } 885 state->arp_table = p; 886 return v; 887 } 888 889 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 890 struct lec_priv *priv) 891 { 892 struct hlist_head *lec_misc_tables[] = { 893 &priv->lec_arp_empty_ones, 894 &priv->lec_no_forward, 895 &priv->mcast_fwds 896 }; 897 void *v = NULL; 898 int q; 899 900 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 901 v = lec_tbl_walk(state, lec_misc_tables[q], l); 902 if (v) 903 break; 904 } 905 state->misc_table = q; 906 return v; 907 } 908 909 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 910 struct lec_priv *priv) 911 { 912 if (!state->locked) { 913 state->locked = priv; 914 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 915 } 916 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 917 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 918 state->locked = NULL; 919 /* Partial state reset for the next time we get called */ 920 state->arp_table = state->misc_table = 0; 921 } 922 return state->locked; 923 } 924 925 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 926 { 927 struct net_device *dev; 928 void *v; 929 930 dev = state->dev ? state->dev : dev_lec[state->itf]; 931 v = (dev && netdev_priv(dev)) ? 932 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 933 if (!v && dev) { 934 /* Partial state reset for the next time we get called */ 935 dev = NULL; 936 } 937 state->dev = dev; 938 return v; 939 } 940 941 static void *lec_get_idx(struct lec_state *state, loff_t l) 942 { 943 void *v = NULL; 944 945 for (; state->itf < MAX_LEC_ITF; state->itf++) { 946 v = lec_itf_walk(state, &l); 947 if (v) 948 break; 949 } 950 return v; 951 } 952 953 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 954 { 955 struct lec_state *state = seq->private; 956 957 mutex_lock(&lec_mutex); 958 state->itf = 0; 959 state->dev = NULL; 960 state->locked = NULL; 961 state->arp_table = 0; 962 state->misc_table = 0; 963 state->node = SEQ_START_TOKEN; 964 965 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 966 } 967 968 static void lec_seq_stop(struct seq_file *seq, void *v) 969 { 970 struct lec_state *state = seq->private; 971 972 if (state->dev) { 973 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 974 state->flags); 975 state->dev = NULL; 976 } 977 mutex_unlock(&lec_mutex); 978 } 979 980 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 981 { 982 struct lec_state *state = seq->private; 983 984 ++*pos; 985 return lec_get_idx(state, 1); 986 } 987 988 static int lec_seq_show(struct seq_file *seq, void *v) 989 { 990 static const char lec_banner[] = 991 "Itf MAC ATM destination" 992 " Status Flags " 993 "VPI/VCI Recv VPI/VCI\n"; 994 995 if (v == SEQ_START_TOKEN) 996 seq_puts(seq, lec_banner); 997 else { 998 struct lec_state *state = seq->private; 999 struct net_device *dev = state->dev; 1000 struct lec_arp_table *entry = hlist_entry(state->node, 1001 struct lec_arp_table, 1002 next); 1003 1004 seq_printf(seq, "%s ", dev->name); 1005 lec_info(seq, entry); 1006 } 1007 return 0; 1008 } 1009 1010 static const struct seq_operations lec_seq_ops = { 1011 .start = lec_seq_start, 1012 .next = lec_seq_next, 1013 .stop = lec_seq_stop, 1014 .show = lec_seq_show, 1015 }; 1016 #endif 1017 1018 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1019 { 1020 struct atm_vcc *vcc = ATM_SD(sock); 1021 int err = 0; 1022 1023 switch (cmd) { 1024 case ATMLEC_CTRL: 1025 case ATMLEC_MCAST: 1026 case ATMLEC_DATA: 1027 if (!capable(CAP_NET_ADMIN)) 1028 return -EPERM; 1029 break; 1030 default: 1031 return -ENOIOCTLCMD; 1032 } 1033 1034 mutex_lock(&lec_mutex); 1035 switch (cmd) { 1036 case ATMLEC_CTRL: 1037 err = lecd_attach(vcc, (int)arg); 1038 if (err >= 0) 1039 sock->state = SS_CONNECTED; 1040 break; 1041 case ATMLEC_MCAST: 1042 err = lec_mcast_attach(vcc, (int)arg); 1043 break; 1044 case ATMLEC_DATA: 1045 err = lec_vcc_attach(vcc, (void __user *)arg); 1046 break; 1047 } 1048 1049 mutex_unlock(&lec_mutex); 1050 return err; 1051 } 1052 1053 static struct atm_ioctl lane_ioctl_ops = { 1054 .owner = THIS_MODULE, 1055 .ioctl = lane_ioctl, 1056 }; 1057 1058 static int __init lane_module_init(void) 1059 { 1060 #ifdef CONFIG_PROC_FS 1061 struct proc_dir_entry *p; 1062 1063 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops, 1064 sizeof(struct lec_state), NULL); 1065 if (!p) { 1066 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1067 return -ENOMEM; 1068 } 1069 #endif 1070 1071 register_atm_ioctl(&lane_ioctl_ops); 1072 pr_info("lec.c: initialized\n"); 1073 return 0; 1074 } 1075 1076 static void __exit lane_module_cleanup(void) 1077 { 1078 int i; 1079 1080 #ifdef CONFIG_PROC_FS 1081 remove_proc_entry("lec", atm_proc_root); 1082 #endif 1083 1084 deregister_atm_ioctl(&lane_ioctl_ops); 1085 1086 for (i = 0; i < MAX_LEC_ITF; i++) { 1087 if (dev_lec[i] != NULL) { 1088 unregister_netdev(dev_lec[i]); 1089 free_netdev(dev_lec[i]); 1090 dev_lec[i] = NULL; 1091 } 1092 } 1093 } 1094 1095 module_init(lane_module_init); 1096 module_exit(lane_module_cleanup); 1097 1098 /* 1099 * LANE2: 3.1.3, LE_RESOLVE.request 1100 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1101 * If sizeoftlvs == NULL the default TLVs associated with this 1102 * lec will be used. 1103 * If dst_mac == NULL, targetless LE_ARP will be sent 1104 */ 1105 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1106 u8 **tlvs, u32 *sizeoftlvs) 1107 { 1108 unsigned long flags; 1109 struct lec_priv *priv = netdev_priv(dev); 1110 struct lec_arp_table *table; 1111 struct sk_buff *skb; 1112 int retval; 1113 1114 if (force == 0) { 1115 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1116 table = lec_arp_find(priv, dst_mac); 1117 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1118 if (table == NULL) 1119 return -1; 1120 1121 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1122 if (*tlvs == NULL) 1123 return -1; 1124 1125 *sizeoftlvs = table->sizeoftlvs; 1126 1127 return 0; 1128 } 1129 1130 if (sizeoftlvs == NULL) 1131 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1132 1133 else { 1134 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1135 if (skb == NULL) 1136 return -1; 1137 skb->len = *sizeoftlvs; 1138 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1139 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1140 } 1141 return retval; 1142 } 1143 1144 /* 1145 * LANE2: 3.1.4, LE_ASSOCIATE.request 1146 * Associate the *tlvs with the *lan_dst address. 1147 * Will overwrite any previous association 1148 * Returns 1 for success, 0 for failure (out of memory) 1149 * 1150 */ 1151 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1152 const u8 *tlvs, u32 sizeoftlvs) 1153 { 1154 int retval; 1155 struct sk_buff *skb; 1156 struct lec_priv *priv = netdev_priv(dev); 1157 1158 if (!ether_addr_equal(lan_dst, dev->dev_addr)) 1159 return 0; /* not our mac address */ 1160 1161 kfree(priv->tlvs); /* NULL if there was no previous association */ 1162 1163 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1164 if (priv->tlvs == NULL) 1165 return 0; 1166 priv->sizeoftlvs = sizeoftlvs; 1167 1168 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1169 if (skb == NULL) 1170 return 0; 1171 skb->len = sizeoftlvs; 1172 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1173 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1174 if (retval != 0) 1175 pr_info("lec.c: lane2_associate_req() failed\n"); 1176 /* 1177 * If the previous association has changed we must 1178 * somehow notify other LANE entities about the change 1179 */ 1180 return 1; 1181 } 1182 1183 /* 1184 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1185 * 1186 */ 1187 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1188 const u8 *tlvs, u32 sizeoftlvs) 1189 { 1190 #if 0 1191 int i = 0; 1192 #endif 1193 struct lec_priv *priv = netdev_priv(dev); 1194 #if 0 /* 1195 * Why have the TLVs in LE_ARP entries 1196 * since we do not use them? When you 1197 * uncomment this code, make sure the 1198 * TLVs get freed when entry is killed 1199 */ 1200 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1201 1202 if (entry == NULL) 1203 return; /* should not happen */ 1204 1205 kfree(entry->tlvs); 1206 1207 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1208 if (entry->tlvs == NULL) 1209 return; 1210 entry->sizeoftlvs = sizeoftlvs; 1211 #endif 1212 #if 0 1213 pr_info("\n"); 1214 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1215 while (i < sizeoftlvs) 1216 pr_cont("%02x ", tlvs[i++]); 1217 1218 pr_cont("\n"); 1219 #endif 1220 1221 /* tell MPOA about the TLVs we saw */ 1222 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1223 priv->lane2_ops->associate_indicator(dev, mac_addr, 1224 tlvs, sizeoftlvs); 1225 } 1226 } 1227 1228 /* 1229 * Here starts what used to lec_arpc.c 1230 * 1231 * lec_arpc.c was added here when making 1232 * lane client modular. October 1997 1233 */ 1234 1235 #include <linux/types.h> 1236 #include <linux/timer.h> 1237 #include <linux/param.h> 1238 #include <linux/atomic.h> 1239 #include <linux/inetdevice.h> 1240 #include <net/route.h> 1241 1242 #if 0 1243 #define pr_debug(format, args...) 1244 /* 1245 #define pr_debug printk 1246 */ 1247 #endif 1248 #define DEBUG_ARP_TABLE 0 1249 1250 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1251 1252 static void lec_arp_check_expire(struct work_struct *work); 1253 static void lec_arp_expire_arp(struct timer_list *t); 1254 1255 /* 1256 * Arp table funcs 1257 */ 1258 1259 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1260 1261 /* 1262 * Initialization of arp-cache 1263 */ 1264 static void lec_arp_init(struct lec_priv *priv) 1265 { 1266 unsigned short i; 1267 1268 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1269 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1270 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1271 INIT_HLIST_HEAD(&priv->lec_no_forward); 1272 INIT_HLIST_HEAD(&priv->mcast_fwds); 1273 spin_lock_init(&priv->lec_arp_lock); 1274 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1275 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1276 } 1277 1278 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1279 { 1280 if (entry->vcc) { 1281 struct atm_vcc *vcc = entry->vcc; 1282 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1283 struct net_device *dev = (struct net_device *)vcc->proto_data; 1284 1285 if (vpriv) { 1286 vcc->pop = vpriv->old_pop; 1287 if (vpriv->xoff) 1288 netif_wake_queue(dev); 1289 kfree(vpriv); 1290 vcc->user_back = NULL; 1291 vcc->push = entry->old_push; 1292 vcc_release_async(vcc, -EPIPE); 1293 } 1294 entry->vcc = NULL; 1295 } 1296 if (entry->recv_vcc) { 1297 struct atm_vcc *vcc = entry->recv_vcc; 1298 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1299 1300 if (vpriv) { 1301 kfree(vpriv); 1302 vcc->user_back = NULL; 1303 1304 entry->recv_vcc->push = entry->old_recv_push; 1305 vcc_release_async(entry->recv_vcc, -EPIPE); 1306 } 1307 entry->recv_vcc = NULL; 1308 } 1309 } 1310 1311 /* 1312 * Insert entry to lec_arp_table 1313 * LANE2: Add to the end of the list to satisfy 8.1.13 1314 */ 1315 static inline void 1316 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1317 { 1318 struct hlist_head *tmp; 1319 1320 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1321 hlist_add_head(&entry->next, tmp); 1322 1323 pr_debug("Added entry:%pM\n", entry->mac_addr); 1324 } 1325 1326 /* 1327 * Remove entry from lec_arp_table 1328 */ 1329 static int 1330 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1331 { 1332 struct lec_arp_table *entry; 1333 int i, remove_vcc = 1; 1334 1335 if (!to_remove) 1336 return -1; 1337 1338 hlist_del(&to_remove->next); 1339 timer_delete(&to_remove->timer); 1340 1341 /* 1342 * If this is the only MAC connected to this VCC, 1343 * also tear down the VCC 1344 */ 1345 if (to_remove->status >= ESI_FLUSH_PENDING) { 1346 /* 1347 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1348 */ 1349 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1350 hlist_for_each_entry(entry, 1351 &priv->lec_arp_tables[i], next) { 1352 if (memcmp(to_remove->atm_addr, 1353 entry->atm_addr, ATM_ESA_LEN) == 0) { 1354 remove_vcc = 0; 1355 break; 1356 } 1357 } 1358 } 1359 if (remove_vcc) 1360 lec_arp_clear_vccs(to_remove); 1361 } 1362 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1363 1364 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1365 return 0; 1366 } 1367 1368 #if DEBUG_ARP_TABLE 1369 static const char *get_status_string(unsigned char st) 1370 { 1371 switch (st) { 1372 case ESI_UNKNOWN: 1373 return "ESI_UNKNOWN"; 1374 case ESI_ARP_PENDING: 1375 return "ESI_ARP_PENDING"; 1376 case ESI_VC_PENDING: 1377 return "ESI_VC_PENDING"; 1378 case ESI_FLUSH_PENDING: 1379 return "ESI_FLUSH_PENDING"; 1380 case ESI_FORWARD_DIRECT: 1381 return "ESI_FORWARD_DIRECT"; 1382 } 1383 return "<UNKNOWN>"; 1384 } 1385 1386 static void dump_arp_table(struct lec_priv *priv) 1387 { 1388 struct lec_arp_table *rulla; 1389 char buf[256]; 1390 int i, offset; 1391 1392 pr_info("Dump %p:\n", priv); 1393 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1394 hlist_for_each_entry(rulla, 1395 &priv->lec_arp_tables[i], next) { 1396 offset = 0; 1397 offset += sprintf(buf, "%d: %p\n", i, rulla); 1398 offset += sprintf(buf + offset, "Mac: %pM ", 1399 rulla->mac_addr); 1400 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1401 rulla->atm_addr); 1402 offset += sprintf(buf + offset, 1403 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1404 rulla->vcc ? rulla->vcc->vpi : 0, 1405 rulla->vcc ? rulla->vcc->vci : 0, 1406 rulla->recv_vcc ? rulla->recv_vcc-> 1407 vpi : 0, 1408 rulla->recv_vcc ? rulla->recv_vcc-> 1409 vci : 0, rulla->last_used, 1410 rulla->timestamp, rulla->no_tries); 1411 offset += 1412 sprintf(buf + offset, 1413 "Flags:%x, Packets_flooded:%x, Status: %s ", 1414 rulla->flags, rulla->packets_flooded, 1415 get_status_string(rulla->status)); 1416 pr_info("%s\n", buf); 1417 } 1418 } 1419 1420 if (!hlist_empty(&priv->lec_no_forward)) 1421 pr_info("No forward\n"); 1422 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) { 1423 offset = 0; 1424 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1425 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1426 rulla->atm_addr); 1427 offset += sprintf(buf + offset, 1428 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1429 rulla->vcc ? rulla->vcc->vpi : 0, 1430 rulla->vcc ? rulla->vcc->vci : 0, 1431 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1432 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1433 rulla->last_used, 1434 rulla->timestamp, rulla->no_tries); 1435 offset += sprintf(buf + offset, 1436 "Flags:%x, Packets_flooded:%x, Status: %s ", 1437 rulla->flags, rulla->packets_flooded, 1438 get_status_string(rulla->status)); 1439 pr_info("%s\n", buf); 1440 } 1441 1442 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1443 pr_info("Empty ones\n"); 1444 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) { 1445 offset = 0; 1446 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1447 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1448 rulla->atm_addr); 1449 offset += sprintf(buf + offset, 1450 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1451 rulla->vcc ? rulla->vcc->vpi : 0, 1452 rulla->vcc ? rulla->vcc->vci : 0, 1453 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1454 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1455 rulla->last_used, 1456 rulla->timestamp, rulla->no_tries); 1457 offset += sprintf(buf + offset, 1458 "Flags:%x, Packets_flooded:%x, Status: %s ", 1459 rulla->flags, rulla->packets_flooded, 1460 get_status_string(rulla->status)); 1461 pr_info("%s", buf); 1462 } 1463 1464 if (!hlist_empty(&priv->mcast_fwds)) 1465 pr_info("Multicast Forward VCCs\n"); 1466 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) { 1467 offset = 0; 1468 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1469 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1470 rulla->atm_addr); 1471 offset += sprintf(buf + offset, 1472 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1473 rulla->vcc ? rulla->vcc->vpi : 0, 1474 rulla->vcc ? rulla->vcc->vci : 0, 1475 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1476 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1477 rulla->last_used, 1478 rulla->timestamp, rulla->no_tries); 1479 offset += sprintf(buf + offset, 1480 "Flags:%x, Packets_flooded:%x, Status: %s ", 1481 rulla->flags, rulla->packets_flooded, 1482 get_status_string(rulla->status)); 1483 pr_info("%s\n", buf); 1484 } 1485 1486 } 1487 #else 1488 #define dump_arp_table(priv) do { } while (0) 1489 #endif 1490 1491 /* 1492 * Destruction of arp-cache 1493 */ 1494 static void lec_arp_destroy(struct lec_priv *priv) 1495 { 1496 unsigned long flags; 1497 struct hlist_node *next; 1498 struct lec_arp_table *entry; 1499 int i; 1500 1501 cancel_delayed_work_sync(&priv->lec_arp_work); 1502 1503 /* 1504 * Remove all entries 1505 */ 1506 1507 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1508 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1509 hlist_for_each_entry_safe(entry, next, 1510 &priv->lec_arp_tables[i], next) { 1511 lec_arp_remove(priv, entry); 1512 lec_arp_put(entry); 1513 } 1514 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1515 } 1516 1517 hlist_for_each_entry_safe(entry, next, 1518 &priv->lec_arp_empty_ones, next) { 1519 timer_delete_sync(&entry->timer); 1520 lec_arp_clear_vccs(entry); 1521 hlist_del(&entry->next); 1522 lec_arp_put(entry); 1523 } 1524 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1525 1526 hlist_for_each_entry_safe(entry, next, 1527 &priv->lec_no_forward, next) { 1528 timer_delete_sync(&entry->timer); 1529 lec_arp_clear_vccs(entry); 1530 hlist_del(&entry->next); 1531 lec_arp_put(entry); 1532 } 1533 INIT_HLIST_HEAD(&priv->lec_no_forward); 1534 1535 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 1536 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1537 lec_arp_clear_vccs(entry); 1538 hlist_del(&entry->next); 1539 lec_arp_put(entry); 1540 } 1541 INIT_HLIST_HEAD(&priv->mcast_fwds); 1542 priv->mcast_vcc = NULL; 1543 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1544 } 1545 1546 /* 1547 * Find entry by mac_address 1548 */ 1549 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1550 const unsigned char *mac_addr) 1551 { 1552 struct hlist_head *head; 1553 struct lec_arp_table *entry; 1554 1555 pr_debug("%pM\n", mac_addr); 1556 1557 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1558 hlist_for_each_entry(entry, head, next) { 1559 if (ether_addr_equal(mac_addr, entry->mac_addr)) 1560 return entry; 1561 } 1562 return NULL; 1563 } 1564 1565 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1566 const unsigned char *mac_addr) 1567 { 1568 struct lec_arp_table *to_return; 1569 1570 to_return = kzalloc_obj(struct lec_arp_table, GFP_ATOMIC); 1571 if (!to_return) 1572 return NULL; 1573 ether_addr_copy(to_return->mac_addr, mac_addr); 1574 INIT_HLIST_NODE(&to_return->next); 1575 timer_setup(&to_return->timer, lec_arp_expire_arp, 0); 1576 to_return->last_used = jiffies; 1577 to_return->priv = priv; 1578 skb_queue_head_init(&to_return->tx_wait); 1579 refcount_set(&to_return->usage, 1); 1580 return to_return; 1581 } 1582 1583 /* Arp sent timer expired */ 1584 static void lec_arp_expire_arp(struct timer_list *t) 1585 { 1586 struct lec_arp_table *entry; 1587 1588 entry = timer_container_of(entry, t, timer); 1589 1590 pr_debug("\n"); 1591 if (entry->status == ESI_ARP_PENDING) { 1592 if (entry->no_tries <= entry->priv->max_retry_count) { 1593 if (entry->is_rdesc) 1594 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1595 entry->mac_addr, NULL, NULL); 1596 else 1597 send_to_lecd(entry->priv, l_arp_xmt, 1598 entry->mac_addr, NULL, NULL); 1599 entry->no_tries++; 1600 } 1601 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1602 } 1603 } 1604 1605 /* Unknown/unused vcc expire, remove associated entry */ 1606 static void lec_arp_expire_vcc(struct timer_list *t) 1607 { 1608 unsigned long flags; 1609 struct lec_arp_table *to_remove = timer_container_of(to_remove, t, 1610 timer); 1611 struct lec_priv *priv = to_remove->priv; 1612 1613 timer_delete(&to_remove->timer); 1614 1615 pr_debug("%p %p: vpi:%d vci:%d\n", 1616 to_remove, priv, 1617 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1618 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1619 1620 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1621 hlist_del(&to_remove->next); 1622 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1623 1624 lec_arp_clear_vccs(to_remove); 1625 lec_arp_put(to_remove); 1626 } 1627 1628 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1629 unsigned long now, 1630 struct lec_priv *priv) 1631 { 1632 unsigned long time_to_check; 1633 1634 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1635 time_to_check = priv->forward_delay_time; 1636 else 1637 time_to_check = priv->aging_time; 1638 1639 pr_debug("About to expire: %lx - %lx > %lx\n", 1640 now, entry->last_used, time_to_check); 1641 if (time_after(now, entry->last_used + time_to_check) && 1642 !(entry->flags & LEC_PERMANENT_FLAG) && 1643 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1644 /* Remove entry */ 1645 pr_debug("Entry timed out\n"); 1646 lec_arp_remove(priv, entry); 1647 lec_arp_put(entry); 1648 } else { 1649 /* Something else */ 1650 if ((entry->status == ESI_VC_PENDING || 1651 entry->status == ESI_ARP_PENDING) && 1652 time_after_eq(now, entry->timestamp + 1653 priv->max_unknown_frame_time)) { 1654 entry->timestamp = jiffies; 1655 entry->packets_flooded = 0; 1656 if (entry->status == ESI_VC_PENDING) 1657 send_to_lecd(priv, l_svc_setup, 1658 entry->mac_addr, 1659 entry->atm_addr, 1660 NULL); 1661 } 1662 if (entry->status == ESI_FLUSH_PENDING && 1663 time_after_eq(now, entry->timestamp + 1664 priv->path_switching_delay)) { 1665 lec_arp_hold(entry); 1666 return true; 1667 } 1668 } 1669 1670 return false; 1671 } 1672 /* 1673 * Expire entries. 1674 * 1. Re-set timer 1675 * 2. For each entry, delete entries that have aged past the age limit. 1676 * 3. For each entry, depending on the status of the entry, perform 1677 * the following maintenance. 1678 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1679 * tick_count is above the max_unknown_frame_time, clear 1680 * the tick_count to zero and clear the packets_flooded counter 1681 * to zero. This supports the packet rate limit per address 1682 * while flooding unknowns. 1683 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1684 * than or equal to the path_switching_delay, change the status 1685 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1686 * regardless of the progress of the flush protocol. 1687 */ 1688 static void lec_arp_check_expire(struct work_struct *work) 1689 { 1690 unsigned long flags; 1691 struct lec_priv *priv = 1692 container_of(work, struct lec_priv, lec_arp_work.work); 1693 struct hlist_node *next; 1694 struct lec_arp_table *entry; 1695 unsigned long now; 1696 int i; 1697 1698 pr_debug("%p\n", priv); 1699 now = jiffies; 1700 restart: 1701 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1702 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1703 hlist_for_each_entry_safe(entry, next, 1704 &priv->lec_arp_tables[i], next) { 1705 if (__lec_arp_check_expire(entry, now, priv)) { 1706 struct sk_buff *skb; 1707 struct atm_vcc *vcc = entry->vcc; 1708 1709 spin_unlock_irqrestore(&priv->lec_arp_lock, 1710 flags); 1711 while ((skb = skb_dequeue(&entry->tx_wait))) 1712 lec_send(vcc, skb); 1713 entry->last_used = jiffies; 1714 entry->status = ESI_FORWARD_DIRECT; 1715 lec_arp_put(entry); 1716 1717 goto restart; 1718 } 1719 } 1720 } 1721 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1722 1723 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1724 } 1725 1726 /* 1727 * Try to find vcc where mac_address is attached. 1728 * 1729 */ 1730 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1731 const unsigned char *mac_to_find, 1732 int is_rdesc, 1733 struct lec_arp_table **ret_entry) 1734 { 1735 unsigned long flags; 1736 struct lec_arp_table *entry; 1737 struct atm_vcc *found; 1738 1739 if (mac_to_find[0] & 0x01) { 1740 switch (priv->lane_version) { 1741 case 1: 1742 return priv->mcast_vcc; 1743 case 2: /* LANE2 wants arp for multicast addresses */ 1744 if (ether_addr_equal(mac_to_find, bus_mac)) 1745 return priv->mcast_vcc; 1746 break; 1747 default: 1748 break; 1749 } 1750 } 1751 1752 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1753 entry = lec_arp_find(priv, mac_to_find); 1754 1755 if (entry) { 1756 if (entry->status == ESI_FORWARD_DIRECT) { 1757 /* Connection Ok */ 1758 entry->last_used = jiffies; 1759 lec_arp_hold(entry); 1760 *ret_entry = entry; 1761 found = entry->vcc; 1762 goto out; 1763 } 1764 /* 1765 * If the LE_ARP cache entry is still pending, reset count to 0 1766 * so another LE_ARP request can be made for this frame. 1767 */ 1768 if (entry->status == ESI_ARP_PENDING) 1769 entry->no_tries = 0; 1770 /* 1771 * Data direct VC not yet set up, check to see if the unknown 1772 * frame count is greater than the limit. If the limit has 1773 * not been reached, allow the caller to send packet to 1774 * BUS. 1775 */ 1776 if (entry->status != ESI_FLUSH_PENDING && 1777 entry->packets_flooded < 1778 priv->maximum_unknown_frame_count) { 1779 entry->packets_flooded++; 1780 pr_debug("Flooding..\n"); 1781 found = priv->mcast_vcc; 1782 goto out; 1783 } 1784 /* 1785 * We got here because entry->status == ESI_FLUSH_PENDING 1786 * or BUS flood limit was reached for an entry which is 1787 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1788 */ 1789 lec_arp_hold(entry); 1790 *ret_entry = entry; 1791 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1792 entry->vcc); 1793 found = NULL; 1794 } else { 1795 /* No matching entry was found */ 1796 entry = make_entry(priv, mac_to_find); 1797 pr_debug("Making entry\n"); 1798 if (!entry) { 1799 found = priv->mcast_vcc; 1800 goto out; 1801 } 1802 lec_arp_add(priv, entry); 1803 /* We want arp-request(s) to be sent */ 1804 entry->packets_flooded = 1; 1805 entry->status = ESI_ARP_PENDING; 1806 entry->no_tries = 1; 1807 entry->last_used = entry->timestamp = jiffies; 1808 entry->is_rdesc = is_rdesc; 1809 if (entry->is_rdesc) 1810 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1811 NULL); 1812 else 1813 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1814 entry->timer.expires = jiffies + (1 * HZ); 1815 entry->timer.function = lec_arp_expire_arp; 1816 add_timer(&entry->timer); 1817 found = priv->mcast_vcc; 1818 } 1819 1820 out: 1821 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1822 return found; 1823 } 1824 1825 static int 1826 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1827 unsigned long permanent) 1828 { 1829 unsigned long flags; 1830 struct hlist_node *next; 1831 struct lec_arp_table *entry; 1832 int i; 1833 1834 pr_debug("\n"); 1835 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1836 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1837 hlist_for_each_entry_safe(entry, next, 1838 &priv->lec_arp_tables[i], next) { 1839 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1840 (permanent || 1841 !(entry->flags & LEC_PERMANENT_FLAG))) { 1842 lec_arp_remove(priv, entry); 1843 lec_arp_put(entry); 1844 } 1845 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1846 return 0; 1847 } 1848 } 1849 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1850 return -1; 1851 } 1852 1853 /* 1854 * Notifies: Response to arp_request (atm_addr != NULL) 1855 */ 1856 static void 1857 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1858 const unsigned char *atm_addr, unsigned long remoteflag, 1859 unsigned int targetless_le_arp) 1860 { 1861 unsigned long flags; 1862 struct hlist_node *next; 1863 struct lec_arp_table *entry, *tmp; 1864 int i; 1865 1866 pr_debug("%smac:%pM\n", 1867 (targetless_le_arp) ? "targetless " : "", mac_addr); 1868 1869 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1870 entry = lec_arp_find(priv, mac_addr); 1871 if (entry == NULL && targetless_le_arp) 1872 goto out; /* 1873 * LANE2: ignore targetless LE_ARPs for which 1874 * we have no entry in the cache. 7.1.30 1875 */ 1876 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1877 hlist_for_each_entry_safe(entry, next, 1878 &priv->lec_arp_empty_ones, next) { 1879 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1880 hlist_del(&entry->next); 1881 timer_delete(&entry->timer); 1882 tmp = lec_arp_find(priv, mac_addr); 1883 if (tmp) { 1884 timer_delete(&tmp->timer); 1885 tmp->status = ESI_FORWARD_DIRECT; 1886 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 1887 tmp->vcc = entry->vcc; 1888 tmp->old_push = entry->old_push; 1889 tmp->last_used = jiffies; 1890 timer_delete(&entry->timer); 1891 lec_arp_put(entry); 1892 entry = tmp; 1893 } else { 1894 entry->status = ESI_FORWARD_DIRECT; 1895 ether_addr_copy(entry->mac_addr, 1896 mac_addr); 1897 entry->last_used = jiffies; 1898 lec_arp_add(priv, entry); 1899 } 1900 if (remoteflag) 1901 entry->flags |= LEC_REMOTE_FLAG; 1902 else 1903 entry->flags &= ~LEC_REMOTE_FLAG; 1904 pr_debug("After update\n"); 1905 dump_arp_table(priv); 1906 goto out; 1907 } 1908 } 1909 } 1910 1911 entry = lec_arp_find(priv, mac_addr); 1912 if (!entry) { 1913 entry = make_entry(priv, mac_addr); 1914 if (!entry) 1915 goto out; 1916 entry->status = ESI_UNKNOWN; 1917 lec_arp_add(priv, entry); 1918 /* Temporary, changes before end of function */ 1919 } 1920 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 1921 timer_delete(&entry->timer); 1922 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1923 hlist_for_each_entry(tmp, 1924 &priv->lec_arp_tables[i], next) { 1925 if (entry != tmp && 1926 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 1927 /* Vcc to this host exists */ 1928 if (tmp->status > ESI_VC_PENDING) { 1929 /* 1930 * ESI_FLUSH_PENDING, 1931 * ESI_FORWARD_DIRECT 1932 */ 1933 entry->vcc = tmp->vcc; 1934 entry->old_push = tmp->old_push; 1935 } 1936 entry->status = tmp->status; 1937 break; 1938 } 1939 } 1940 } 1941 if (remoteflag) 1942 entry->flags |= LEC_REMOTE_FLAG; 1943 else 1944 entry->flags &= ~LEC_REMOTE_FLAG; 1945 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 1946 entry->status = ESI_VC_PENDING; 1947 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 1948 } 1949 pr_debug("After update2\n"); 1950 dump_arp_table(priv); 1951 out: 1952 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1953 } 1954 1955 /* 1956 * Notifies: Vcc setup ready 1957 */ 1958 static void 1959 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 1960 struct atm_vcc *vcc, 1961 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 1962 { 1963 unsigned long flags; 1964 struct lec_arp_table *entry; 1965 int i, found_entry = 0; 1966 1967 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1968 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1969 if (ioc_data->receive == 2) { 1970 pr_debug("LEC_ARP: Attaching mcast forward\n"); 1971 #if 0 1972 entry = lec_arp_find(priv, bus_mac); 1973 if (!entry) { 1974 pr_info("LEC_ARP: Multicast entry not found!\n"); 1975 goto out; 1976 } 1977 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1978 entry->recv_vcc = vcc; 1979 entry->old_recv_push = old_push; 1980 #endif 1981 entry = make_entry(priv, bus_mac); 1982 if (entry == NULL) 1983 goto out; 1984 timer_delete(&entry->timer); 1985 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1986 entry->recv_vcc = vcc; 1987 entry->old_recv_push = old_push; 1988 hlist_add_head(&entry->next, &priv->mcast_fwds); 1989 goto out; 1990 } else if (ioc_data->receive == 1) { 1991 /* 1992 * Vcc which we don't want to make default vcc, 1993 * attach it anyway. 1994 */ 1995 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n", 1996 ATM_ESA_LEN, ioc_data->atm_addr); 1997 entry = make_entry(priv, bus_mac); 1998 if (entry == NULL) 1999 goto out; 2000 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2001 eth_zero_addr(entry->mac_addr); 2002 entry->recv_vcc = vcc; 2003 entry->old_recv_push = old_push; 2004 entry->status = ESI_UNKNOWN; 2005 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2006 entry->timer.function = lec_arp_expire_vcc; 2007 hlist_add_head(&entry->next, &priv->lec_no_forward); 2008 add_timer(&entry->timer); 2009 dump_arp_table(priv); 2010 goto out; 2011 } 2012 pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n", 2013 ATM_ESA_LEN, ioc_data->atm_addr); 2014 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2015 hlist_for_each_entry(entry, 2016 &priv->lec_arp_tables[i], next) { 2017 if (memcmp 2018 (ioc_data->atm_addr, entry->atm_addr, 2019 ATM_ESA_LEN) == 0) { 2020 pr_debug("LEC_ARP: Attaching data direct\n"); 2021 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 2022 entry->vcc ? entry->vcc->vci : 0, 2023 entry->recv_vcc ? entry->recv_vcc-> 2024 vci : 0); 2025 found_entry = 1; 2026 timer_delete(&entry->timer); 2027 entry->vcc = vcc; 2028 entry->old_push = old_push; 2029 if (entry->status == ESI_VC_PENDING) { 2030 if (priv->maximum_unknown_frame_count 2031 == 0) 2032 entry->status = 2033 ESI_FORWARD_DIRECT; 2034 else { 2035 entry->timestamp = jiffies; 2036 entry->status = 2037 ESI_FLUSH_PENDING; 2038 #if 0 2039 send_to_lecd(priv, l_flush_xmt, 2040 NULL, 2041 entry->atm_addr, 2042 NULL); 2043 #endif 2044 } 2045 } else { 2046 /* 2047 * They were forming a connection 2048 * to us, and we to them. Our 2049 * ATM address is numerically lower 2050 * than theirs, so we make connection 2051 * we formed into default VCC (8.1.11). 2052 * Connection they made gets torn 2053 * down. This might confuse some 2054 * clients. Can be changed if 2055 * someone reports trouble... 2056 */ 2057 ; 2058 } 2059 } 2060 } 2061 } 2062 if (found_entry) { 2063 pr_debug("After vcc was added\n"); 2064 dump_arp_table(priv); 2065 goto out; 2066 } 2067 /* 2068 * Not found, snatch address from first data packet that arrives 2069 * from this vcc 2070 */ 2071 entry = make_entry(priv, bus_mac); 2072 if (!entry) 2073 goto out; 2074 entry->vcc = vcc; 2075 entry->old_push = old_push; 2076 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2077 eth_zero_addr(entry->mac_addr); 2078 entry->status = ESI_UNKNOWN; 2079 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2080 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2081 entry->timer.function = lec_arp_expire_vcc; 2082 add_timer(&entry->timer); 2083 pr_debug("After vcc was added\n"); 2084 dump_arp_table(priv); 2085 out: 2086 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2087 } 2088 2089 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2090 { 2091 unsigned long flags; 2092 struct lec_arp_table *entry; 2093 int i; 2094 2095 pr_debug("%lx\n", tran_id); 2096 restart: 2097 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2098 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2099 hlist_for_each_entry(entry, 2100 &priv->lec_arp_tables[i], next) { 2101 if (entry->flush_tran_id == tran_id && 2102 entry->status == ESI_FLUSH_PENDING) { 2103 struct sk_buff *skb; 2104 struct atm_vcc *vcc = entry->vcc; 2105 2106 lec_arp_hold(entry); 2107 spin_unlock_irqrestore(&priv->lec_arp_lock, 2108 flags); 2109 while ((skb = skb_dequeue(&entry->tx_wait))) 2110 lec_send(vcc, skb); 2111 entry->last_used = jiffies; 2112 entry->status = ESI_FORWARD_DIRECT; 2113 lec_arp_put(entry); 2114 pr_debug("LEC_ARP: Flushed\n"); 2115 goto restart; 2116 } 2117 } 2118 } 2119 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2120 dump_arp_table(priv); 2121 } 2122 2123 static void 2124 lec_set_flush_tran_id(struct lec_priv *priv, 2125 const unsigned char *atm_addr, unsigned long tran_id) 2126 { 2127 unsigned long flags; 2128 struct lec_arp_table *entry; 2129 int i; 2130 2131 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2132 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2133 hlist_for_each_entry(entry, 2134 &priv->lec_arp_tables[i], next) { 2135 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2136 entry->flush_tran_id = tran_id; 2137 pr_debug("Set flush transaction id to %lx for %p\n", 2138 tran_id, entry); 2139 } 2140 } 2141 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2142 } 2143 2144 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2145 { 2146 unsigned long flags; 2147 unsigned char mac_addr[] = { 2148 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2149 }; 2150 struct lec_arp_table *to_add; 2151 struct lec_vcc_priv *vpriv; 2152 int err = 0; 2153 2154 vpriv = kmalloc_obj(struct lec_vcc_priv); 2155 if (!vpriv) 2156 return -ENOMEM; 2157 vpriv->xoff = 0; 2158 vpriv->old_pop = vcc->pop; 2159 vcc->user_back = vpriv; 2160 vcc->pop = lec_pop; 2161 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2162 to_add = make_entry(priv, mac_addr); 2163 if (!to_add) { 2164 vcc->pop = vpriv->old_pop; 2165 kfree(vpriv); 2166 err = -ENOMEM; 2167 goto out; 2168 } 2169 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2170 to_add->status = ESI_FORWARD_DIRECT; 2171 to_add->flags |= LEC_PERMANENT_FLAG; 2172 to_add->vcc = vcc; 2173 to_add->old_push = vcc->push; 2174 vcc->push = lec_push; 2175 priv->mcast_vcc = vcc; 2176 lec_arp_add(priv, to_add); 2177 out: 2178 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2179 return err; 2180 } 2181 2182 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2183 { 2184 unsigned long flags; 2185 struct hlist_node *next; 2186 struct lec_arp_table *entry; 2187 int i; 2188 2189 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2190 dump_arp_table(priv); 2191 2192 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2193 2194 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2195 hlist_for_each_entry_safe(entry, next, 2196 &priv->lec_arp_tables[i], next) { 2197 if (vcc == entry->vcc) { 2198 lec_arp_remove(priv, entry); 2199 lec_arp_put(entry); 2200 if (priv->mcast_vcc == vcc) 2201 priv->mcast_vcc = NULL; 2202 } 2203 } 2204 } 2205 2206 hlist_for_each_entry_safe(entry, next, 2207 &priv->lec_arp_empty_ones, next) { 2208 if (entry->vcc == vcc) { 2209 lec_arp_clear_vccs(entry); 2210 timer_delete(&entry->timer); 2211 hlist_del(&entry->next); 2212 lec_arp_put(entry); 2213 } 2214 } 2215 2216 hlist_for_each_entry_safe(entry, next, 2217 &priv->lec_no_forward, next) { 2218 if (entry->recv_vcc == vcc) { 2219 lec_arp_clear_vccs(entry); 2220 timer_delete(&entry->timer); 2221 hlist_del(&entry->next); 2222 lec_arp_put(entry); 2223 } 2224 } 2225 2226 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 2227 if (entry->recv_vcc == vcc) { 2228 lec_arp_clear_vccs(entry); 2229 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2230 hlist_del(&entry->next); 2231 lec_arp_put(entry); 2232 } 2233 } 2234 2235 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2236 dump_arp_table(priv); 2237 } 2238 2239 static void 2240 lec_arp_check_empties(struct lec_priv *priv, 2241 struct atm_vcc *vcc, struct sk_buff *skb) 2242 { 2243 unsigned long flags; 2244 struct hlist_node *next; 2245 struct lec_arp_table *entry, *tmp; 2246 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2247 unsigned char *src = hdr->h_source; 2248 2249 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2250 hlist_for_each_entry_safe(entry, next, 2251 &priv->lec_arp_empty_ones, next) { 2252 if (vcc == entry->vcc) { 2253 timer_delete(&entry->timer); 2254 ether_addr_copy(entry->mac_addr, src); 2255 entry->status = ESI_FORWARD_DIRECT; 2256 entry->last_used = jiffies; 2257 /* We might have got an entry */ 2258 tmp = lec_arp_find(priv, src); 2259 if (tmp) { 2260 lec_arp_remove(priv, tmp); 2261 lec_arp_put(tmp); 2262 } 2263 hlist_del(&entry->next); 2264 lec_arp_add(priv, entry); 2265 goto out; 2266 } 2267 } 2268 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2269 out: 2270 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2271 } 2272 2273 MODULE_DESCRIPTION("ATM LAN Emulation (LANE) support"); 2274 MODULE_LICENSE("GPL"); 2275