1 /* 2 * lec.c: Lan Emulation driver 3 * 4 * Marko Kiiskila <mkiiskila@yahoo.com> 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 8 9 #include <linux/slab.h> 10 #include <linux/kernel.h> 11 #include <linux/bitops.h> 12 #include <linux/capability.h> 13 14 /* We are ethernet device */ 15 #include <linux/if_ether.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <net/sock.h> 19 #include <linux/skbuff.h> 20 #include <linux/ip.h> 21 #include <asm/byteorder.h> 22 #include <linux/uaccess.h> 23 #include <net/arp.h> 24 #include <net/dst.h> 25 #include <linux/proc_fs.h> 26 #include <linux/spinlock.h> 27 #include <linux/seq_file.h> 28 29 /* And atm device */ 30 #include <linux/atmdev.h> 31 #include <linux/atmlec.h> 32 33 /* Proxy LEC knows about bridging */ 34 #if IS_ENABLED(CONFIG_BRIDGE) 35 #include "../bridge/br_private.h" 36 37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 }; 38 #endif 39 40 /* Modular too */ 41 #include <linux/module.h> 42 #include <linux/init.h> 43 44 /* Hardening for Spectre-v1 */ 45 #include <linux/nospec.h> 46 47 #include "lec.h" 48 #include "lec_arpc.h" 49 #include "resources.h" 50 51 #define DUMP_PACKETS 0 /* 52 * 0 = None, 53 * 1 = 30 first bytes 54 * 2 = Whole packet 55 */ 56 57 #define LEC_UNRES_QUE_LEN 8 /* 58 * number of tx packets to queue for a 59 * single destination while waiting for SVC 60 */ 61 62 static int lec_open(struct net_device *dev); 63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 64 struct net_device *dev); 65 static int lec_close(struct net_device *dev); 66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 67 const unsigned char *mac_addr); 68 static int lec_arp_remove(struct lec_priv *priv, 69 struct lec_arp_table *to_remove); 70 /* LANE2 functions */ 71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address, 72 const u8 *tlvs, u32 sizeoftlvs); 73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 74 u8 **tlvs, u32 *sizeoftlvs); 75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 76 const u8 *tlvs, u32 sizeoftlvs); 77 78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 79 unsigned long permanent); 80 static void lec_arp_check_empties(struct lec_priv *priv, 81 struct atm_vcc *vcc, struct sk_buff *skb); 82 static void lec_arp_destroy(struct lec_priv *priv); 83 static void lec_arp_init(struct lec_priv *priv); 84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 85 const unsigned char *mac_to_find, 86 int is_rdesc, 87 struct lec_arp_table **ret_entry); 88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 89 const unsigned char *atm_addr, 90 unsigned long remoteflag, 91 unsigned int targetless_le_arp); 92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id); 93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc); 94 static void lec_set_flush_tran_id(struct lec_priv *priv, 95 const unsigned char *atm_addr, 96 unsigned long tran_id); 97 static void lec_vcc_added(struct lec_priv *priv, 98 const struct atmlec_ioc *ioc_data, 99 struct atm_vcc *vcc, 100 void (*old_push)(struct atm_vcc *vcc, 101 struct sk_buff *skb)); 102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc); 103 104 /* must be done under lec_arp_lock */ 105 static inline void lec_arp_hold(struct lec_arp_table *entry) 106 { 107 refcount_inc(&entry->usage); 108 } 109 110 static inline void lec_arp_put(struct lec_arp_table *entry) 111 { 112 if (refcount_dec_and_test(&entry->usage)) 113 kfree(entry); 114 } 115 116 static struct lane2_ops lane2_ops = { 117 .resolve = lane2_resolve, /* spec 3.1.3 */ 118 .associate_req = lane2_associate_req, /* spec 3.1.4 */ 119 .associate_indicator = NULL /* spec 3.1.5 */ 120 }; 121 122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 123 124 /* Device structures */ 125 static struct net_device *dev_lec[MAX_LEC_ITF]; 126 127 #if IS_ENABLED(CONFIG_BRIDGE) 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev) 129 { 130 char *buff; 131 struct lec_priv *priv; 132 133 /* 134 * Check if this is a BPDU. If so, ask zeppelin to send 135 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit 136 * as the Config BPDU has 137 */ 138 buff = skb->data + skb->dev->hard_header_len; 139 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) { 140 struct sock *sk; 141 struct sk_buff *skb2; 142 struct atmlec_msg *mesg; 143 144 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 145 if (skb2 == NULL) 146 return; 147 skb2->len = sizeof(struct atmlec_msg); 148 mesg = (struct atmlec_msg *)skb2->data; 149 mesg->type = l_topology_change; 150 buff += 4; 151 mesg->content.normal.flag = *buff & 0x01; 152 /* 0x01 is topology change */ 153 154 priv = netdev_priv(dev); 155 atm_force_charge(priv->lecd, skb2->truesize); 156 sk = sk_atm(priv->lecd); 157 skb_queue_tail(&sk->sk_receive_queue, skb2); 158 sk->sk_data_ready(sk); 159 } 160 } 161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 162 163 /* 164 * Open/initialize the netdevice. This is called (in the current kernel) 165 * sometime after booting when the 'ifconfig' program is run. 166 * 167 * This routine should set everything up anew at each open, even 168 * registers that "should" only need to be set once at boot, so that 169 * there is non-reboot way to recover if something goes wrong. 170 */ 171 172 static int lec_open(struct net_device *dev) 173 { 174 netif_start_queue(dev); 175 176 return 0; 177 } 178 179 static void 180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb) 181 { 182 struct net_device *dev = skb->dev; 183 184 ATM_SKB(skb)->vcc = vcc; 185 atm_account_tx(vcc, skb); 186 187 if (vcc->send(vcc, skb) < 0) { 188 dev->stats.tx_dropped++; 189 return; 190 } 191 192 dev->stats.tx_packets++; 193 dev->stats.tx_bytes += skb->len; 194 } 195 196 static void lec_tx_timeout(struct net_device *dev) 197 { 198 pr_info("%s\n", dev->name); 199 netif_trans_update(dev); 200 netif_wake_queue(dev); 201 } 202 203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 204 struct net_device *dev) 205 { 206 struct sk_buff *skb2; 207 struct lec_priv *priv = netdev_priv(dev); 208 struct lecdatahdr_8023 *lec_h; 209 struct atm_vcc *vcc; 210 struct lec_arp_table *entry; 211 unsigned char *dst; 212 int min_frame_size; 213 int is_rdesc; 214 215 pr_debug("called\n"); 216 if (!priv->lecd) { 217 pr_info("%s:No lecd attached\n", dev->name); 218 dev->stats.tx_errors++; 219 netif_stop_queue(dev); 220 kfree_skb(skb); 221 return NETDEV_TX_OK; 222 } 223 224 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n", 225 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb), 226 (long)skb_end_pointer(skb)); 227 #if IS_ENABLED(CONFIG_BRIDGE) 228 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) 229 lec_handle_bridge(skb, dev); 230 #endif 231 232 /* Make sure we have room for lec_id */ 233 if (skb_headroom(skb) < 2) { 234 pr_debug("reallocating skb\n"); 235 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 236 if (unlikely(!skb2)) { 237 kfree_skb(skb); 238 return NETDEV_TX_OK; 239 } 240 consume_skb(skb); 241 skb = skb2; 242 } 243 skb_push(skb, 2); 244 245 /* Put le header to place */ 246 lec_h = (struct lecdatahdr_8023 *)skb->data; 247 lec_h->le_header = htons(priv->lecid); 248 249 #if DUMP_PACKETS >= 2 250 #define MAX_DUMP_SKB 99 251 #elif DUMP_PACKETS >= 1 252 #define MAX_DUMP_SKB 30 253 #endif 254 #if DUMP_PACKETS >= 1 255 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n", 256 dev->name, skb->len, priv->lecid); 257 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 258 skb->data, min(skb->len, MAX_DUMP_SKB), true); 259 #endif /* DUMP_PACKETS >= 1 */ 260 261 /* Minimum ethernet-frame size */ 262 min_frame_size = LEC_MINIMUM_8023_SIZE; 263 if (skb->len < min_frame_size) { 264 if ((skb->len + skb_tailroom(skb)) < min_frame_size) { 265 skb2 = skb_copy_expand(skb, 0, 266 min_frame_size - skb->truesize, 267 GFP_ATOMIC); 268 dev_kfree_skb(skb); 269 if (skb2 == NULL) { 270 dev->stats.tx_dropped++; 271 return NETDEV_TX_OK; 272 } 273 skb = skb2; 274 } 275 skb_put(skb, min_frame_size - skb->len); 276 } 277 278 /* Send to right vcc */ 279 is_rdesc = 0; 280 dst = lec_h->h_dest; 281 entry = NULL; 282 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); 283 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", 284 dev->name, vcc, vcc ? vcc->flags : 0, entry); 285 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) { 286 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { 287 pr_debug("%s:queuing packet, MAC address %pM\n", 288 dev->name, lec_h->h_dest); 289 skb_queue_tail(&entry->tx_wait, skb); 290 } else { 291 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n", 292 dev->name, lec_h->h_dest); 293 dev->stats.tx_dropped++; 294 dev_kfree_skb(skb); 295 } 296 goto out; 297 } 298 #if DUMP_PACKETS > 0 299 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n", 300 dev->name, vcc->vpi, vcc->vci); 301 #endif /* DUMP_PACKETS > 0 */ 302 303 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { 304 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest); 305 lec_send(vcc, skb2); 306 } 307 308 lec_send(vcc, skb); 309 310 if (!atm_may_send(vcc, 0)) { 311 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 312 313 vpriv->xoff = 1; 314 netif_stop_queue(dev); 315 316 /* 317 * vcc->pop() might have occurred in between, making 318 * the vcc usuable again. Since xmit is serialized, 319 * this is the only situation we have to re-test. 320 */ 321 322 if (atm_may_send(vcc, 0)) 323 netif_wake_queue(dev); 324 } 325 326 out: 327 if (entry) 328 lec_arp_put(entry); 329 netif_trans_update(dev); 330 return NETDEV_TX_OK; 331 } 332 333 /* The inverse routine to net_open(). */ 334 static int lec_close(struct net_device *dev) 335 { 336 netif_stop_queue(dev); 337 return 0; 338 } 339 340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 341 { 342 unsigned long flags; 343 struct net_device *dev = (struct net_device *)vcc->proto_data; 344 struct lec_priv *priv = netdev_priv(dev); 345 struct atmlec_msg *mesg; 346 struct lec_arp_table *entry; 347 int i; 348 char *tmp; /* FIXME */ 349 350 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); 351 mesg = (struct atmlec_msg *)skb->data; 352 tmp = skb->data; 353 tmp += sizeof(struct atmlec_msg); 354 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type); 355 switch (mesg->type) { 356 case l_set_mac_addr: 357 for (i = 0; i < 6; i++) 358 dev->dev_addr[i] = mesg->content.normal.mac_addr[i]; 359 break; 360 case l_del_mac_addr: 361 for (i = 0; i < 6; i++) 362 dev->dev_addr[i] = 0; 363 break; 364 case l_addr_delete: 365 lec_addr_delete(priv, mesg->content.normal.atm_addr, 366 mesg->content.normal.flag); 367 break; 368 case l_topology_change: 369 priv->topology_change = mesg->content.normal.flag; 370 break; 371 case l_flush_complete: 372 lec_flush_complete(priv, mesg->content.normal.flag); 373 break; 374 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ 375 spin_lock_irqsave(&priv->lec_arp_lock, flags); 376 entry = lec_arp_find(priv, mesg->content.normal.mac_addr); 377 lec_arp_remove(priv, entry); 378 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 379 380 if (mesg->content.normal.no_source_le_narp) 381 break; 382 /* FALL THROUGH */ 383 case l_arp_update: 384 lec_arp_update(priv, mesg->content.normal.mac_addr, 385 mesg->content.normal.atm_addr, 386 mesg->content.normal.flag, 387 mesg->content.normal.targetless_le_arp); 388 pr_debug("in l_arp_update\n"); 389 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ 390 pr_debug("LANE2 3.1.5, got tlvs, size %d\n", 391 mesg->sizeoftlvs); 392 lane2_associate_ind(dev, mesg->content.normal.mac_addr, 393 tmp, mesg->sizeoftlvs); 394 } 395 break; 396 case l_config: 397 priv->maximum_unknown_frame_count = 398 mesg->content.config.maximum_unknown_frame_count; 399 priv->max_unknown_frame_time = 400 (mesg->content.config.max_unknown_frame_time * HZ); 401 priv->max_retry_count = mesg->content.config.max_retry_count; 402 priv->aging_time = (mesg->content.config.aging_time * HZ); 403 priv->forward_delay_time = 404 (mesg->content.config.forward_delay_time * HZ); 405 priv->arp_response_time = 406 (mesg->content.config.arp_response_time * HZ); 407 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ); 408 priv->path_switching_delay = 409 (mesg->content.config.path_switching_delay * HZ); 410 priv->lane_version = mesg->content.config.lane_version; 411 /* LANE2 */ 412 priv->lane2_ops = NULL; 413 if (priv->lane_version > 1) 414 priv->lane2_ops = &lane2_ops; 415 rtnl_lock(); 416 if (dev_set_mtu(dev, mesg->content.config.mtu)) 417 pr_info("%s: change_mtu to %d failed\n", 418 dev->name, mesg->content.config.mtu); 419 rtnl_unlock(); 420 priv->is_proxy = mesg->content.config.is_proxy; 421 break; 422 case l_flush_tran_id: 423 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, 424 mesg->content.normal.flag); 425 break; 426 case l_set_lecid: 427 priv->lecid = 428 (unsigned short)(0xffff & mesg->content.normal.flag); 429 break; 430 case l_should_bridge: 431 #if IS_ENABLED(CONFIG_BRIDGE) 432 { 433 pr_debug("%s: bridge zeppelin asks about %pM\n", 434 dev->name, mesg->content.proxy.mac_addr); 435 436 if (br_fdb_test_addr_hook == NULL) 437 break; 438 439 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) { 440 /* hit from bridge table, send LE_ARP_RESPONSE */ 441 struct sk_buff *skb2; 442 struct sock *sk; 443 444 pr_debug("%s: entry found, responding to zeppelin\n", 445 dev->name); 446 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 447 if (skb2 == NULL) 448 break; 449 skb2->len = sizeof(struct atmlec_msg); 450 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg)); 451 atm_force_charge(priv->lecd, skb2->truesize); 452 sk = sk_atm(priv->lecd); 453 skb_queue_tail(&sk->sk_receive_queue, skb2); 454 sk->sk_data_ready(sk); 455 } 456 } 457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 458 break; 459 default: 460 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type); 461 dev_kfree_skb(skb); 462 return -EINVAL; 463 } 464 dev_kfree_skb(skb); 465 return 0; 466 } 467 468 static void lec_atm_close(struct atm_vcc *vcc) 469 { 470 struct sk_buff *skb; 471 struct net_device *dev = (struct net_device *)vcc->proto_data; 472 struct lec_priv *priv = netdev_priv(dev); 473 474 priv->lecd = NULL; 475 /* Do something needful? */ 476 477 netif_stop_queue(dev); 478 lec_arp_destroy(priv); 479 480 if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) 481 pr_info("%s closing with messages pending\n", dev->name); 482 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 483 atm_return(vcc, skb->truesize); 484 dev_kfree_skb(skb); 485 } 486 487 pr_info("%s: Shut down!\n", dev->name); 488 module_put(THIS_MODULE); 489 } 490 491 static const struct atmdev_ops lecdev_ops = { 492 .close = lec_atm_close, 493 .send = lec_atm_send 494 }; 495 496 static struct atm_dev lecatm_dev = { 497 .ops = &lecdev_ops, 498 .type = "lec", 499 .number = 999, /* dummy device number */ 500 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock) 501 }; 502 503 /* 504 * LANE2: new argument struct sk_buff *data contains 505 * the LE_ARP based TLVs introduced in the LANE2 spec 506 */ 507 static int 508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 509 const unsigned char *mac_addr, const unsigned char *atm_addr, 510 struct sk_buff *data) 511 { 512 struct sock *sk; 513 struct sk_buff *skb; 514 struct atmlec_msg *mesg; 515 516 if (!priv || !priv->lecd) 517 return -1; 518 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 519 if (!skb) 520 return -1; 521 skb->len = sizeof(struct atmlec_msg); 522 mesg = (struct atmlec_msg *)skb->data; 523 memset(mesg, 0, sizeof(struct atmlec_msg)); 524 mesg->type = type; 525 if (data != NULL) 526 mesg->sizeoftlvs = data->len; 527 if (mac_addr) 528 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr); 529 else 530 mesg->content.normal.targetless_le_arp = 1; 531 if (atm_addr) 532 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); 533 534 atm_force_charge(priv->lecd, skb->truesize); 535 sk = sk_atm(priv->lecd); 536 skb_queue_tail(&sk->sk_receive_queue, skb); 537 sk->sk_data_ready(sk); 538 539 if (data != NULL) { 540 pr_debug("about to send %d bytes of data\n", data->len); 541 atm_force_charge(priv->lecd, data->truesize); 542 skb_queue_tail(&sk->sk_receive_queue, data); 543 sk->sk_data_ready(sk); 544 } 545 546 return 0; 547 } 548 549 static void lec_set_multicast_list(struct net_device *dev) 550 { 551 /* 552 * by default, all multicast frames arrive over the bus. 553 * eventually support selective multicast service 554 */ 555 } 556 557 static const struct net_device_ops lec_netdev_ops = { 558 .ndo_open = lec_open, 559 .ndo_stop = lec_close, 560 .ndo_start_xmit = lec_start_xmit, 561 .ndo_tx_timeout = lec_tx_timeout, 562 .ndo_set_rx_mode = lec_set_multicast_list, 563 }; 564 565 static const unsigned char lec_ctrl_magic[] = { 566 0xff, 567 0x00, 568 0x01, 569 0x01 570 }; 571 572 #define LEC_DATA_DIRECT_8023 2 573 #define LEC_DATA_DIRECT_8025 3 574 575 static int lec_is_data_direct(struct atm_vcc *vcc) 576 { 577 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) || 578 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025)); 579 } 580 581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb) 582 { 583 unsigned long flags; 584 struct net_device *dev = (struct net_device *)vcc->proto_data; 585 struct lec_priv *priv = netdev_priv(dev); 586 587 #if DUMP_PACKETS > 0 588 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n", 589 dev->name, vcc->vpi, vcc->vci); 590 #endif 591 if (!skb) { 592 pr_debug("%s: null skb\n", dev->name); 593 lec_vcc_close(priv, vcc); 594 return; 595 } 596 #if DUMP_PACKETS >= 2 597 #define MAX_SKB_DUMP 99 598 #elif DUMP_PACKETS >= 1 599 #define MAX_SKB_DUMP 30 600 #endif 601 #if DUMP_PACKETS > 0 602 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n", 603 dev->name, skb->len, priv->lecid); 604 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 605 skb->data, min(MAX_SKB_DUMP, skb->len), true); 606 #endif /* DUMP_PACKETS > 0 */ 607 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { 608 /* Control frame, to daemon */ 609 struct sock *sk = sk_atm(vcc); 610 611 pr_debug("%s: To daemon\n", dev->name); 612 skb_queue_tail(&sk->sk_receive_queue, skb); 613 sk->sk_data_ready(sk); 614 } else { /* Data frame, queue to protocol handlers */ 615 struct lec_arp_table *entry; 616 unsigned char *src, *dst; 617 618 atm_return(vcc, skb->truesize); 619 if (*(__be16 *) skb->data == htons(priv->lecid) || 620 !priv->lecd || !(dev->flags & IFF_UP)) { 621 /* 622 * Probably looping back, or if lecd is missing, 623 * lecd has gone down 624 */ 625 pr_debug("Ignoring frame...\n"); 626 dev_kfree_skb(skb); 627 return; 628 } 629 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; 630 631 /* 632 * If this is a Data Direct VCC, and the VCC does not match 633 * the LE_ARP cache entry, delete the LE_ARP cache entry. 634 */ 635 spin_lock_irqsave(&priv->lec_arp_lock, flags); 636 if (lec_is_data_direct(vcc)) { 637 src = ((struct lecdatahdr_8023 *)skb->data)->h_source; 638 entry = lec_arp_find(priv, src); 639 if (entry && entry->vcc != vcc) { 640 lec_arp_remove(priv, entry); 641 lec_arp_put(entry); 642 } 643 } 644 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 645 646 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */ 647 !priv->is_proxy && /* Proxy wants all the packets */ 648 memcmp(dst, dev->dev_addr, dev->addr_len)) { 649 dev_kfree_skb(skb); 650 return; 651 } 652 if (!hlist_empty(&priv->lec_arp_empty_ones)) 653 lec_arp_check_empties(priv, vcc, skb); 654 skb_pull(skb, 2); /* skip lec_id */ 655 skb->protocol = eth_type_trans(skb, dev); 656 dev->stats.rx_packets++; 657 dev->stats.rx_bytes += skb->len; 658 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 659 netif_rx(skb); 660 } 661 } 662 663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) 664 { 665 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 666 struct net_device *dev = skb->dev; 667 668 if (vpriv == NULL) { 669 pr_info("vpriv = NULL!?!?!?\n"); 670 return; 671 } 672 673 vpriv->old_pop(vcc, skb); 674 675 if (vpriv->xoff && atm_may_send(vcc, 0)) { 676 vpriv->xoff = 0; 677 if (netif_running(dev) && netif_queue_stopped(dev)) 678 netif_wake_queue(dev); 679 } 680 } 681 682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) 683 { 684 struct lec_vcc_priv *vpriv; 685 int bytes_left; 686 struct atmlec_ioc ioc_data; 687 688 /* Lecd must be up in this case */ 689 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); 690 if (bytes_left != 0) 691 pr_info("copy from user failed for %d bytes\n", bytes_left); 692 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 693 return -EINVAL; 694 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF); 695 if (!dev_lec[ioc_data.dev_num]) 696 return -EINVAL; 697 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 698 if (!vpriv) 699 return -ENOMEM; 700 vpriv->xoff = 0; 701 vpriv->old_pop = vcc->pop; 702 vcc->user_back = vpriv; 703 vcc->pop = lec_pop; 704 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]), 705 &ioc_data, vcc, vcc->push); 706 vcc->proto_data = dev_lec[ioc_data.dev_num]; 707 vcc->push = lec_push; 708 return 0; 709 } 710 711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg) 712 { 713 if (arg < 0 || arg >= MAX_LEC_ITF) 714 return -EINVAL; 715 arg = array_index_nospec(arg, MAX_LEC_ITF); 716 if (!dev_lec[arg]) 717 return -EINVAL; 718 vcc->proto_data = dev_lec[arg]; 719 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc); 720 } 721 722 /* Initialize device. */ 723 static int lecd_attach(struct atm_vcc *vcc, int arg) 724 { 725 int i; 726 struct lec_priv *priv; 727 728 if (arg < 0) 729 i = 0; 730 else 731 i = arg; 732 if (arg >= MAX_LEC_ITF) 733 return -EINVAL; 734 i = array_index_nospec(arg, MAX_LEC_ITF); 735 if (!dev_lec[i]) { 736 int size; 737 738 size = sizeof(struct lec_priv); 739 dev_lec[i] = alloc_etherdev(size); 740 if (!dev_lec[i]) 741 return -ENOMEM; 742 dev_lec[i]->netdev_ops = &lec_netdev_ops; 743 dev_lec[i]->max_mtu = 18190; 744 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 745 if (register_netdev(dev_lec[i])) { 746 free_netdev(dev_lec[i]); 747 return -EINVAL; 748 } 749 750 priv = netdev_priv(dev_lec[i]); 751 } else { 752 priv = netdev_priv(dev_lec[i]); 753 if (priv->lecd) 754 return -EADDRINUSE; 755 } 756 lec_arp_init(priv); 757 priv->itfnum = i; /* LANE2 addition */ 758 priv->lecd = vcc; 759 vcc->dev = &lecatm_dev; 760 vcc_insert_socket(sk_atm(vcc)); 761 762 vcc->proto_data = dev_lec[i]; 763 set_bit(ATM_VF_META, &vcc->flags); 764 set_bit(ATM_VF_READY, &vcc->flags); 765 766 /* Set default values to these variables */ 767 priv->maximum_unknown_frame_count = 1; 768 priv->max_unknown_frame_time = (1 * HZ); 769 priv->vcc_timeout_period = (1200 * HZ); 770 priv->max_retry_count = 1; 771 priv->aging_time = (300 * HZ); 772 priv->forward_delay_time = (15 * HZ); 773 priv->topology_change = 0; 774 priv->arp_response_time = (1 * HZ); 775 priv->flush_timeout = (4 * HZ); 776 priv->path_switching_delay = (6 * HZ); 777 778 if (dev_lec[i]->flags & IFF_UP) 779 netif_start_queue(dev_lec[i]); 780 __module_get(THIS_MODULE); 781 return i; 782 } 783 784 #ifdef CONFIG_PROC_FS 785 static const char *lec_arp_get_status_string(unsigned char status) 786 { 787 static const char *const lec_arp_status_string[] = { 788 "ESI_UNKNOWN ", 789 "ESI_ARP_PENDING ", 790 "ESI_VC_PENDING ", 791 "<Undefined> ", 792 "ESI_FLUSH_PENDING ", 793 "ESI_FORWARD_DIRECT" 794 }; 795 796 if (status > ESI_FORWARD_DIRECT) 797 status = 3; /* ESI_UNDEFINED */ 798 return lec_arp_status_string[status]; 799 } 800 801 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 802 { 803 int i; 804 805 for (i = 0; i < ETH_ALEN; i++) 806 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); 807 seq_printf(seq, " "); 808 for (i = 0; i < ATM_ESA_LEN; i++) 809 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); 810 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), 811 entry->flags & 0xffff); 812 if (entry->vcc) 813 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 814 else 815 seq_printf(seq, " "); 816 if (entry->recv_vcc) { 817 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 818 entry->recv_vcc->vci); 819 } 820 seq_putc(seq, '\n'); 821 } 822 823 struct lec_state { 824 unsigned long flags; 825 struct lec_priv *locked; 826 struct hlist_node *node; 827 struct net_device *dev; 828 int itf; 829 int arp_table; 830 int misc_table; 831 }; 832 833 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 834 loff_t *l) 835 { 836 struct hlist_node *e = state->node; 837 838 if (!e) 839 e = tbl->first; 840 if (e == SEQ_START_TOKEN) { 841 e = tbl->first; 842 --*l; 843 } 844 845 for (; e; e = e->next) { 846 if (--*l < 0) 847 break; 848 } 849 state->node = e; 850 851 return (*l < 0) ? state : NULL; 852 } 853 854 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 855 struct lec_priv *priv) 856 { 857 void *v = NULL; 858 int p; 859 860 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 861 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 862 if (v) 863 break; 864 } 865 state->arp_table = p; 866 return v; 867 } 868 869 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 870 struct lec_priv *priv) 871 { 872 struct hlist_head *lec_misc_tables[] = { 873 &priv->lec_arp_empty_ones, 874 &priv->lec_no_forward, 875 &priv->mcast_fwds 876 }; 877 void *v = NULL; 878 int q; 879 880 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 881 v = lec_tbl_walk(state, lec_misc_tables[q], l); 882 if (v) 883 break; 884 } 885 state->misc_table = q; 886 return v; 887 } 888 889 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 890 struct lec_priv *priv) 891 { 892 if (!state->locked) { 893 state->locked = priv; 894 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 895 } 896 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 897 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 898 state->locked = NULL; 899 /* Partial state reset for the next time we get called */ 900 state->arp_table = state->misc_table = 0; 901 } 902 return state->locked; 903 } 904 905 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 906 { 907 struct net_device *dev; 908 void *v; 909 910 dev = state->dev ? state->dev : dev_lec[state->itf]; 911 v = (dev && netdev_priv(dev)) ? 912 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 913 if (!v && dev) { 914 dev_put(dev); 915 /* Partial state reset for the next time we get called */ 916 dev = NULL; 917 } 918 state->dev = dev; 919 return v; 920 } 921 922 static void *lec_get_idx(struct lec_state *state, loff_t l) 923 { 924 void *v = NULL; 925 926 for (; state->itf < MAX_LEC_ITF; state->itf++) { 927 v = lec_itf_walk(state, &l); 928 if (v) 929 break; 930 } 931 return v; 932 } 933 934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 935 { 936 struct lec_state *state = seq->private; 937 938 state->itf = 0; 939 state->dev = NULL; 940 state->locked = NULL; 941 state->arp_table = 0; 942 state->misc_table = 0; 943 state->node = SEQ_START_TOKEN; 944 945 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 946 } 947 948 static void lec_seq_stop(struct seq_file *seq, void *v) 949 { 950 struct lec_state *state = seq->private; 951 952 if (state->dev) { 953 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 954 state->flags); 955 dev_put(state->dev); 956 } 957 } 958 959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 960 { 961 struct lec_state *state = seq->private; 962 963 v = lec_get_idx(state, 1); 964 *pos += !!PTR_ERR(v); 965 return v; 966 } 967 968 static int lec_seq_show(struct seq_file *seq, void *v) 969 { 970 static const char lec_banner[] = 971 "Itf MAC ATM destination" 972 " Status Flags " 973 "VPI/VCI Recv VPI/VCI\n"; 974 975 if (v == SEQ_START_TOKEN) 976 seq_puts(seq, lec_banner); 977 else { 978 struct lec_state *state = seq->private; 979 struct net_device *dev = state->dev; 980 struct lec_arp_table *entry = hlist_entry(state->node, 981 struct lec_arp_table, 982 next); 983 984 seq_printf(seq, "%s ", dev->name); 985 lec_info(seq, entry); 986 } 987 return 0; 988 } 989 990 static const struct seq_operations lec_seq_ops = { 991 .start = lec_seq_start, 992 .next = lec_seq_next, 993 .stop = lec_seq_stop, 994 .show = lec_seq_show, 995 }; 996 #endif 997 998 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 999 { 1000 struct atm_vcc *vcc = ATM_SD(sock); 1001 int err = 0; 1002 1003 switch (cmd) { 1004 case ATMLEC_CTRL: 1005 case ATMLEC_MCAST: 1006 case ATMLEC_DATA: 1007 if (!capable(CAP_NET_ADMIN)) 1008 return -EPERM; 1009 break; 1010 default: 1011 return -ENOIOCTLCMD; 1012 } 1013 1014 switch (cmd) { 1015 case ATMLEC_CTRL: 1016 err = lecd_attach(vcc, (int)arg); 1017 if (err >= 0) 1018 sock->state = SS_CONNECTED; 1019 break; 1020 case ATMLEC_MCAST: 1021 err = lec_mcast_attach(vcc, (int)arg); 1022 break; 1023 case ATMLEC_DATA: 1024 err = lec_vcc_attach(vcc, (void __user *)arg); 1025 break; 1026 } 1027 1028 return err; 1029 } 1030 1031 static struct atm_ioctl lane_ioctl_ops = { 1032 .owner = THIS_MODULE, 1033 .ioctl = lane_ioctl, 1034 }; 1035 1036 static int __init lane_module_init(void) 1037 { 1038 #ifdef CONFIG_PROC_FS 1039 struct proc_dir_entry *p; 1040 1041 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops, 1042 sizeof(struct lec_state), NULL); 1043 if (!p) { 1044 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1045 return -ENOMEM; 1046 } 1047 #endif 1048 1049 register_atm_ioctl(&lane_ioctl_ops); 1050 pr_info("lec.c: initialized\n"); 1051 return 0; 1052 } 1053 1054 static void __exit lane_module_cleanup(void) 1055 { 1056 int i; 1057 1058 #ifdef CONFIG_PROC_FS 1059 remove_proc_entry("lec", atm_proc_root); 1060 #endif 1061 1062 deregister_atm_ioctl(&lane_ioctl_ops); 1063 1064 for (i = 0; i < MAX_LEC_ITF; i++) { 1065 if (dev_lec[i] != NULL) { 1066 unregister_netdev(dev_lec[i]); 1067 free_netdev(dev_lec[i]); 1068 dev_lec[i] = NULL; 1069 } 1070 } 1071 } 1072 1073 module_init(lane_module_init); 1074 module_exit(lane_module_cleanup); 1075 1076 /* 1077 * LANE2: 3.1.3, LE_RESOLVE.request 1078 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1079 * If sizeoftlvs == NULL the default TLVs associated with with this 1080 * lec will be used. 1081 * If dst_mac == NULL, targetless LE_ARP will be sent 1082 */ 1083 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1084 u8 **tlvs, u32 *sizeoftlvs) 1085 { 1086 unsigned long flags; 1087 struct lec_priv *priv = netdev_priv(dev); 1088 struct lec_arp_table *table; 1089 struct sk_buff *skb; 1090 int retval; 1091 1092 if (force == 0) { 1093 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1094 table = lec_arp_find(priv, dst_mac); 1095 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1096 if (table == NULL) 1097 return -1; 1098 1099 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1100 if (*tlvs == NULL) 1101 return -1; 1102 1103 *sizeoftlvs = table->sizeoftlvs; 1104 1105 return 0; 1106 } 1107 1108 if (sizeoftlvs == NULL) 1109 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1110 1111 else { 1112 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1113 if (skb == NULL) 1114 return -1; 1115 skb->len = *sizeoftlvs; 1116 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1117 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1118 } 1119 return retval; 1120 } 1121 1122 /* 1123 * LANE2: 3.1.4, LE_ASSOCIATE.request 1124 * Associate the *tlvs with the *lan_dst address. 1125 * Will overwrite any previous association 1126 * Returns 1 for success, 0 for failure (out of memory) 1127 * 1128 */ 1129 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1130 const u8 *tlvs, u32 sizeoftlvs) 1131 { 1132 int retval; 1133 struct sk_buff *skb; 1134 struct lec_priv *priv = netdev_priv(dev); 1135 1136 if (!ether_addr_equal(lan_dst, dev->dev_addr)) 1137 return 0; /* not our mac address */ 1138 1139 kfree(priv->tlvs); /* NULL if there was no previous association */ 1140 1141 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1142 if (priv->tlvs == NULL) 1143 return 0; 1144 priv->sizeoftlvs = sizeoftlvs; 1145 1146 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1147 if (skb == NULL) 1148 return 0; 1149 skb->len = sizeoftlvs; 1150 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1151 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1152 if (retval != 0) 1153 pr_info("lec.c: lane2_associate_req() failed\n"); 1154 /* 1155 * If the previous association has changed we must 1156 * somehow notify other LANE entities about the change 1157 */ 1158 return 1; 1159 } 1160 1161 /* 1162 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1163 * 1164 */ 1165 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1166 const u8 *tlvs, u32 sizeoftlvs) 1167 { 1168 #if 0 1169 int i = 0; 1170 #endif 1171 struct lec_priv *priv = netdev_priv(dev); 1172 #if 0 /* 1173 * Why have the TLVs in LE_ARP entries 1174 * since we do not use them? When you 1175 * uncomment this code, make sure the 1176 * TLVs get freed when entry is killed 1177 */ 1178 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1179 1180 if (entry == NULL) 1181 return; /* should not happen */ 1182 1183 kfree(entry->tlvs); 1184 1185 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1186 if (entry->tlvs == NULL) 1187 return; 1188 entry->sizeoftlvs = sizeoftlvs; 1189 #endif 1190 #if 0 1191 pr_info("\n"); 1192 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1193 while (i < sizeoftlvs) 1194 pr_cont("%02x ", tlvs[i++]); 1195 1196 pr_cont("\n"); 1197 #endif 1198 1199 /* tell MPOA about the TLVs we saw */ 1200 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1201 priv->lane2_ops->associate_indicator(dev, mac_addr, 1202 tlvs, sizeoftlvs); 1203 } 1204 } 1205 1206 /* 1207 * Here starts what used to lec_arpc.c 1208 * 1209 * lec_arpc.c was added here when making 1210 * lane client modular. October 1997 1211 */ 1212 1213 #include <linux/types.h> 1214 #include <linux/timer.h> 1215 #include <linux/param.h> 1216 #include <linux/atomic.h> 1217 #include <linux/inetdevice.h> 1218 #include <net/route.h> 1219 1220 #if 0 1221 #define pr_debug(format, args...) 1222 /* 1223 #define pr_debug printk 1224 */ 1225 #endif 1226 #define DEBUG_ARP_TABLE 0 1227 1228 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1229 1230 static void lec_arp_check_expire(struct work_struct *work); 1231 static void lec_arp_expire_arp(struct timer_list *t); 1232 1233 /* 1234 * Arp table funcs 1235 */ 1236 1237 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1238 1239 /* 1240 * Initialization of arp-cache 1241 */ 1242 static void lec_arp_init(struct lec_priv *priv) 1243 { 1244 unsigned short i; 1245 1246 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1247 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1248 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1249 INIT_HLIST_HEAD(&priv->lec_no_forward); 1250 INIT_HLIST_HEAD(&priv->mcast_fwds); 1251 spin_lock_init(&priv->lec_arp_lock); 1252 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1253 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1254 } 1255 1256 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1257 { 1258 if (entry->vcc) { 1259 struct atm_vcc *vcc = entry->vcc; 1260 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1261 struct net_device *dev = (struct net_device *)vcc->proto_data; 1262 1263 vcc->pop = vpriv->old_pop; 1264 if (vpriv->xoff) 1265 netif_wake_queue(dev); 1266 kfree(vpriv); 1267 vcc->user_back = NULL; 1268 vcc->push = entry->old_push; 1269 vcc_release_async(vcc, -EPIPE); 1270 entry->vcc = NULL; 1271 } 1272 if (entry->recv_vcc) { 1273 entry->recv_vcc->push = entry->old_recv_push; 1274 vcc_release_async(entry->recv_vcc, -EPIPE); 1275 entry->recv_vcc = NULL; 1276 } 1277 } 1278 1279 /* 1280 * Insert entry to lec_arp_table 1281 * LANE2: Add to the end of the list to satisfy 8.1.13 1282 */ 1283 static inline void 1284 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1285 { 1286 struct hlist_head *tmp; 1287 1288 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1289 hlist_add_head(&entry->next, tmp); 1290 1291 pr_debug("Added entry:%pM\n", entry->mac_addr); 1292 } 1293 1294 /* 1295 * Remove entry from lec_arp_table 1296 */ 1297 static int 1298 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1299 { 1300 struct lec_arp_table *entry; 1301 int i, remove_vcc = 1; 1302 1303 if (!to_remove) 1304 return -1; 1305 1306 hlist_del(&to_remove->next); 1307 del_timer(&to_remove->timer); 1308 1309 /* 1310 * If this is the only MAC connected to this VCC, 1311 * also tear down the VCC 1312 */ 1313 if (to_remove->status >= ESI_FLUSH_PENDING) { 1314 /* 1315 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1316 */ 1317 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1318 hlist_for_each_entry(entry, 1319 &priv->lec_arp_tables[i], next) { 1320 if (memcmp(to_remove->atm_addr, 1321 entry->atm_addr, ATM_ESA_LEN) == 0) { 1322 remove_vcc = 0; 1323 break; 1324 } 1325 } 1326 } 1327 if (remove_vcc) 1328 lec_arp_clear_vccs(to_remove); 1329 } 1330 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1331 1332 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1333 return 0; 1334 } 1335 1336 #if DEBUG_ARP_TABLE 1337 static const char *get_status_string(unsigned char st) 1338 { 1339 switch (st) { 1340 case ESI_UNKNOWN: 1341 return "ESI_UNKNOWN"; 1342 case ESI_ARP_PENDING: 1343 return "ESI_ARP_PENDING"; 1344 case ESI_VC_PENDING: 1345 return "ESI_VC_PENDING"; 1346 case ESI_FLUSH_PENDING: 1347 return "ESI_FLUSH_PENDING"; 1348 case ESI_FORWARD_DIRECT: 1349 return "ESI_FORWARD_DIRECT"; 1350 } 1351 return "<UNKNOWN>"; 1352 } 1353 1354 static void dump_arp_table(struct lec_priv *priv) 1355 { 1356 struct lec_arp_table *rulla; 1357 char buf[256]; 1358 int i, j, offset; 1359 1360 pr_info("Dump %p:\n", priv); 1361 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1362 hlist_for_each_entry(rulla, 1363 &priv->lec_arp_tables[i], next) { 1364 offset = 0; 1365 offset += sprintf(buf, "%d: %p\n", i, rulla); 1366 offset += sprintf(buf + offset, "Mac: %pM", 1367 rulla->mac_addr); 1368 offset += sprintf(buf + offset, " Atm:"); 1369 for (j = 0; j < ATM_ESA_LEN; j++) { 1370 offset += sprintf(buf + offset, 1371 "%2.2x ", 1372 rulla->atm_addr[j] & 0xff); 1373 } 1374 offset += sprintf(buf + offset, 1375 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1376 rulla->vcc ? rulla->vcc->vpi : 0, 1377 rulla->vcc ? rulla->vcc->vci : 0, 1378 rulla->recv_vcc ? rulla->recv_vcc-> 1379 vpi : 0, 1380 rulla->recv_vcc ? rulla->recv_vcc-> 1381 vci : 0, rulla->last_used, 1382 rulla->timestamp, rulla->no_tries); 1383 offset += 1384 sprintf(buf + offset, 1385 "Flags:%x, Packets_flooded:%x, Status: %s ", 1386 rulla->flags, rulla->packets_flooded, 1387 get_status_string(rulla->status)); 1388 pr_info("%s\n", buf); 1389 } 1390 } 1391 1392 if (!hlist_empty(&priv->lec_no_forward)) 1393 pr_info("No forward\n"); 1394 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) { 1395 offset = 0; 1396 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1397 offset += sprintf(buf + offset, " Atm:"); 1398 for (j = 0; j < ATM_ESA_LEN; j++) { 1399 offset += sprintf(buf + offset, "%2.2x ", 1400 rulla->atm_addr[j] & 0xff); 1401 } 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->vpi : 0, 1407 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1408 rulla->last_used, 1409 rulla->timestamp, rulla->no_tries); 1410 offset += sprintf(buf + offset, 1411 "Flags:%x, Packets_flooded:%x, Status: %s ", 1412 rulla->flags, rulla->packets_flooded, 1413 get_status_string(rulla->status)); 1414 pr_info("%s\n", buf); 1415 } 1416 1417 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1418 pr_info("Empty ones\n"); 1419 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) { 1420 offset = 0; 1421 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1422 offset += sprintf(buf + offset, " Atm:"); 1423 for (j = 0; j < ATM_ESA_LEN; j++) { 1424 offset += sprintf(buf + offset, "%2.2x ", 1425 rulla->atm_addr[j] & 0xff); 1426 } 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", buf); 1440 } 1441 1442 if (!hlist_empty(&priv->mcast_fwds)) 1443 pr_info("Multicast Forward VCCs\n"); 1444 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) { 1445 offset = 0; 1446 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1447 offset += sprintf(buf + offset, " Atm:"); 1448 for (j = 0; j < ATM_ESA_LEN; j++) { 1449 offset += sprintf(buf + offset, "%2.2x ", 1450 rulla->atm_addr[j] & 0xff); 1451 } 1452 offset += sprintf(buf + offset, 1453 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1454 rulla->vcc ? rulla->vcc->vpi : 0, 1455 rulla->vcc ? rulla->vcc->vci : 0, 1456 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1457 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1458 rulla->last_used, 1459 rulla->timestamp, rulla->no_tries); 1460 offset += sprintf(buf + offset, 1461 "Flags:%x, Packets_flooded:%x, Status: %s ", 1462 rulla->flags, rulla->packets_flooded, 1463 get_status_string(rulla->status)); 1464 pr_info("%s\n", buf); 1465 } 1466 1467 } 1468 #else 1469 #define dump_arp_table(priv) do { } while (0) 1470 #endif 1471 1472 /* 1473 * Destruction of arp-cache 1474 */ 1475 static void lec_arp_destroy(struct lec_priv *priv) 1476 { 1477 unsigned long flags; 1478 struct hlist_node *next; 1479 struct lec_arp_table *entry; 1480 int i; 1481 1482 cancel_delayed_work_sync(&priv->lec_arp_work); 1483 1484 /* 1485 * Remove all entries 1486 */ 1487 1488 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1489 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1490 hlist_for_each_entry_safe(entry, next, 1491 &priv->lec_arp_tables[i], next) { 1492 lec_arp_remove(priv, entry); 1493 lec_arp_put(entry); 1494 } 1495 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1496 } 1497 1498 hlist_for_each_entry_safe(entry, next, 1499 &priv->lec_arp_empty_ones, next) { 1500 del_timer_sync(&entry->timer); 1501 lec_arp_clear_vccs(entry); 1502 hlist_del(&entry->next); 1503 lec_arp_put(entry); 1504 } 1505 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1506 1507 hlist_for_each_entry_safe(entry, next, 1508 &priv->lec_no_forward, next) { 1509 del_timer_sync(&entry->timer); 1510 lec_arp_clear_vccs(entry); 1511 hlist_del(&entry->next); 1512 lec_arp_put(entry); 1513 } 1514 INIT_HLIST_HEAD(&priv->lec_no_forward); 1515 1516 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 1517 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1518 lec_arp_clear_vccs(entry); 1519 hlist_del(&entry->next); 1520 lec_arp_put(entry); 1521 } 1522 INIT_HLIST_HEAD(&priv->mcast_fwds); 1523 priv->mcast_vcc = NULL; 1524 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1525 } 1526 1527 /* 1528 * Find entry by mac_address 1529 */ 1530 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1531 const unsigned char *mac_addr) 1532 { 1533 struct hlist_head *head; 1534 struct lec_arp_table *entry; 1535 1536 pr_debug("%pM\n", mac_addr); 1537 1538 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1539 hlist_for_each_entry(entry, head, next) { 1540 if (ether_addr_equal(mac_addr, entry->mac_addr)) 1541 return entry; 1542 } 1543 return NULL; 1544 } 1545 1546 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1547 const unsigned char *mac_addr) 1548 { 1549 struct lec_arp_table *to_return; 1550 1551 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1552 if (!to_return) { 1553 pr_info("LEC: Arp entry kmalloc failed\n"); 1554 return NULL; 1555 } 1556 ether_addr_copy(to_return->mac_addr, mac_addr); 1557 INIT_HLIST_NODE(&to_return->next); 1558 timer_setup(&to_return->timer, lec_arp_expire_arp, 0); 1559 to_return->last_used = jiffies; 1560 to_return->priv = priv; 1561 skb_queue_head_init(&to_return->tx_wait); 1562 refcount_set(&to_return->usage, 1); 1563 return to_return; 1564 } 1565 1566 /* Arp sent timer expired */ 1567 static void lec_arp_expire_arp(struct timer_list *t) 1568 { 1569 struct lec_arp_table *entry; 1570 1571 entry = from_timer(entry, t, timer); 1572 1573 pr_debug("\n"); 1574 if (entry->status == ESI_ARP_PENDING) { 1575 if (entry->no_tries <= entry->priv->max_retry_count) { 1576 if (entry->is_rdesc) 1577 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1578 entry->mac_addr, NULL, NULL); 1579 else 1580 send_to_lecd(entry->priv, l_arp_xmt, 1581 entry->mac_addr, NULL, NULL); 1582 entry->no_tries++; 1583 } 1584 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1585 } 1586 } 1587 1588 /* Unknown/unused vcc expire, remove associated entry */ 1589 static void lec_arp_expire_vcc(struct timer_list *t) 1590 { 1591 unsigned long flags; 1592 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer); 1593 struct lec_priv *priv = to_remove->priv; 1594 1595 del_timer(&to_remove->timer); 1596 1597 pr_debug("%p %p: vpi:%d vci:%d\n", 1598 to_remove, priv, 1599 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1600 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1601 1602 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1603 hlist_del(&to_remove->next); 1604 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1605 1606 lec_arp_clear_vccs(to_remove); 1607 lec_arp_put(to_remove); 1608 } 1609 1610 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1611 unsigned long now, 1612 struct lec_priv *priv) 1613 { 1614 unsigned long time_to_check; 1615 1616 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1617 time_to_check = priv->forward_delay_time; 1618 else 1619 time_to_check = priv->aging_time; 1620 1621 pr_debug("About to expire: %lx - %lx > %lx\n", 1622 now, entry->last_used, time_to_check); 1623 if (time_after(now, entry->last_used + time_to_check) && 1624 !(entry->flags & LEC_PERMANENT_FLAG) && 1625 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1626 /* Remove entry */ 1627 pr_debug("Entry timed out\n"); 1628 lec_arp_remove(priv, entry); 1629 lec_arp_put(entry); 1630 } else { 1631 /* Something else */ 1632 if ((entry->status == ESI_VC_PENDING || 1633 entry->status == ESI_ARP_PENDING) && 1634 time_after_eq(now, entry->timestamp + 1635 priv->max_unknown_frame_time)) { 1636 entry->timestamp = jiffies; 1637 entry->packets_flooded = 0; 1638 if (entry->status == ESI_VC_PENDING) 1639 send_to_lecd(priv, l_svc_setup, 1640 entry->mac_addr, 1641 entry->atm_addr, 1642 NULL); 1643 } 1644 if (entry->status == ESI_FLUSH_PENDING && 1645 time_after_eq(now, entry->timestamp + 1646 priv->path_switching_delay)) { 1647 lec_arp_hold(entry); 1648 return true; 1649 } 1650 } 1651 1652 return false; 1653 } 1654 /* 1655 * Expire entries. 1656 * 1. Re-set timer 1657 * 2. For each entry, delete entries that have aged past the age limit. 1658 * 3. For each entry, depending on the status of the entry, perform 1659 * the following maintenance. 1660 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1661 * tick_count is above the max_unknown_frame_time, clear 1662 * the tick_count to zero and clear the packets_flooded counter 1663 * to zero. This supports the packet rate limit per address 1664 * while flooding unknowns. 1665 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1666 * than or equal to the path_switching_delay, change the status 1667 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1668 * regardless of the progress of the flush protocol. 1669 */ 1670 static void lec_arp_check_expire(struct work_struct *work) 1671 { 1672 unsigned long flags; 1673 struct lec_priv *priv = 1674 container_of(work, struct lec_priv, lec_arp_work.work); 1675 struct hlist_node *next; 1676 struct lec_arp_table *entry; 1677 unsigned long now; 1678 int i; 1679 1680 pr_debug("%p\n", priv); 1681 now = jiffies; 1682 restart: 1683 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1684 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1685 hlist_for_each_entry_safe(entry, next, 1686 &priv->lec_arp_tables[i], next) { 1687 if (__lec_arp_check_expire(entry, now, priv)) { 1688 struct sk_buff *skb; 1689 struct atm_vcc *vcc = entry->vcc; 1690 1691 spin_unlock_irqrestore(&priv->lec_arp_lock, 1692 flags); 1693 while ((skb = skb_dequeue(&entry->tx_wait))) 1694 lec_send(vcc, skb); 1695 entry->last_used = jiffies; 1696 entry->status = ESI_FORWARD_DIRECT; 1697 lec_arp_put(entry); 1698 1699 goto restart; 1700 } 1701 } 1702 } 1703 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1704 1705 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1706 } 1707 1708 /* 1709 * Try to find vcc where mac_address is attached. 1710 * 1711 */ 1712 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1713 const unsigned char *mac_to_find, 1714 int is_rdesc, 1715 struct lec_arp_table **ret_entry) 1716 { 1717 unsigned long flags; 1718 struct lec_arp_table *entry; 1719 struct atm_vcc *found; 1720 1721 if (mac_to_find[0] & 0x01) { 1722 switch (priv->lane_version) { 1723 case 1: 1724 return priv->mcast_vcc; 1725 case 2: /* LANE2 wants arp for multicast addresses */ 1726 if (ether_addr_equal(mac_to_find, bus_mac)) 1727 return priv->mcast_vcc; 1728 break; 1729 default: 1730 break; 1731 } 1732 } 1733 1734 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1735 entry = lec_arp_find(priv, mac_to_find); 1736 1737 if (entry) { 1738 if (entry->status == ESI_FORWARD_DIRECT) { 1739 /* Connection Ok */ 1740 entry->last_used = jiffies; 1741 lec_arp_hold(entry); 1742 *ret_entry = entry; 1743 found = entry->vcc; 1744 goto out; 1745 } 1746 /* 1747 * If the LE_ARP cache entry is still pending, reset count to 0 1748 * so another LE_ARP request can be made for this frame. 1749 */ 1750 if (entry->status == ESI_ARP_PENDING) 1751 entry->no_tries = 0; 1752 /* 1753 * Data direct VC not yet set up, check to see if the unknown 1754 * frame count is greater than the limit. If the limit has 1755 * not been reached, allow the caller to send packet to 1756 * BUS. 1757 */ 1758 if (entry->status != ESI_FLUSH_PENDING && 1759 entry->packets_flooded < 1760 priv->maximum_unknown_frame_count) { 1761 entry->packets_flooded++; 1762 pr_debug("Flooding..\n"); 1763 found = priv->mcast_vcc; 1764 goto out; 1765 } 1766 /* 1767 * We got here because entry->status == ESI_FLUSH_PENDING 1768 * or BUS flood limit was reached for an entry which is 1769 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1770 */ 1771 lec_arp_hold(entry); 1772 *ret_entry = entry; 1773 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1774 entry->vcc); 1775 found = NULL; 1776 } else { 1777 /* No matching entry was found */ 1778 entry = make_entry(priv, mac_to_find); 1779 pr_debug("Making entry\n"); 1780 if (!entry) { 1781 found = priv->mcast_vcc; 1782 goto out; 1783 } 1784 lec_arp_add(priv, entry); 1785 /* We want arp-request(s) to be sent */ 1786 entry->packets_flooded = 1; 1787 entry->status = ESI_ARP_PENDING; 1788 entry->no_tries = 1; 1789 entry->last_used = entry->timestamp = jiffies; 1790 entry->is_rdesc = is_rdesc; 1791 if (entry->is_rdesc) 1792 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1793 NULL); 1794 else 1795 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1796 entry->timer.expires = jiffies + (1 * HZ); 1797 entry->timer.function = lec_arp_expire_arp; 1798 add_timer(&entry->timer); 1799 found = priv->mcast_vcc; 1800 } 1801 1802 out: 1803 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1804 return found; 1805 } 1806 1807 static int 1808 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1809 unsigned long permanent) 1810 { 1811 unsigned long flags; 1812 struct hlist_node *next; 1813 struct lec_arp_table *entry; 1814 int i; 1815 1816 pr_debug("\n"); 1817 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1818 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1819 hlist_for_each_entry_safe(entry, next, 1820 &priv->lec_arp_tables[i], next) { 1821 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1822 (permanent || 1823 !(entry->flags & LEC_PERMANENT_FLAG))) { 1824 lec_arp_remove(priv, entry); 1825 lec_arp_put(entry); 1826 } 1827 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1828 return 0; 1829 } 1830 } 1831 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1832 return -1; 1833 } 1834 1835 /* 1836 * Notifies: Response to arp_request (atm_addr != NULL) 1837 */ 1838 static void 1839 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1840 const unsigned char *atm_addr, unsigned long remoteflag, 1841 unsigned int targetless_le_arp) 1842 { 1843 unsigned long flags; 1844 struct hlist_node *next; 1845 struct lec_arp_table *entry, *tmp; 1846 int i; 1847 1848 pr_debug("%smac:%pM\n", 1849 (targetless_le_arp) ? "targetless " : "", mac_addr); 1850 1851 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1852 entry = lec_arp_find(priv, mac_addr); 1853 if (entry == NULL && targetless_le_arp) 1854 goto out; /* 1855 * LANE2: ignore targetless LE_ARPs for which 1856 * we have no entry in the cache. 7.1.30 1857 */ 1858 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1859 hlist_for_each_entry_safe(entry, next, 1860 &priv->lec_arp_empty_ones, next) { 1861 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1862 hlist_del(&entry->next); 1863 del_timer(&entry->timer); 1864 tmp = lec_arp_find(priv, mac_addr); 1865 if (tmp) { 1866 del_timer(&tmp->timer); 1867 tmp->status = ESI_FORWARD_DIRECT; 1868 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 1869 tmp->vcc = entry->vcc; 1870 tmp->old_push = entry->old_push; 1871 tmp->last_used = jiffies; 1872 del_timer(&entry->timer); 1873 lec_arp_put(entry); 1874 entry = tmp; 1875 } else { 1876 entry->status = ESI_FORWARD_DIRECT; 1877 ether_addr_copy(entry->mac_addr, 1878 mac_addr); 1879 entry->last_used = jiffies; 1880 lec_arp_add(priv, entry); 1881 } 1882 if (remoteflag) 1883 entry->flags |= LEC_REMOTE_FLAG; 1884 else 1885 entry->flags &= ~LEC_REMOTE_FLAG; 1886 pr_debug("After update\n"); 1887 dump_arp_table(priv); 1888 goto out; 1889 } 1890 } 1891 } 1892 1893 entry = lec_arp_find(priv, mac_addr); 1894 if (!entry) { 1895 entry = make_entry(priv, mac_addr); 1896 if (!entry) 1897 goto out; 1898 entry->status = ESI_UNKNOWN; 1899 lec_arp_add(priv, entry); 1900 /* Temporary, changes before end of function */ 1901 } 1902 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 1903 del_timer(&entry->timer); 1904 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1905 hlist_for_each_entry(tmp, 1906 &priv->lec_arp_tables[i], next) { 1907 if (entry != tmp && 1908 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 1909 /* Vcc to this host exists */ 1910 if (tmp->status > ESI_VC_PENDING) { 1911 /* 1912 * ESI_FLUSH_PENDING, 1913 * ESI_FORWARD_DIRECT 1914 */ 1915 entry->vcc = tmp->vcc; 1916 entry->old_push = tmp->old_push; 1917 } 1918 entry->status = tmp->status; 1919 break; 1920 } 1921 } 1922 } 1923 if (remoteflag) 1924 entry->flags |= LEC_REMOTE_FLAG; 1925 else 1926 entry->flags &= ~LEC_REMOTE_FLAG; 1927 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 1928 entry->status = ESI_VC_PENDING; 1929 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 1930 } 1931 pr_debug("After update2\n"); 1932 dump_arp_table(priv); 1933 out: 1934 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1935 } 1936 1937 /* 1938 * Notifies: Vcc setup ready 1939 */ 1940 static void 1941 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 1942 struct atm_vcc *vcc, 1943 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 1944 { 1945 unsigned long flags; 1946 struct lec_arp_table *entry; 1947 int i, found_entry = 0; 1948 1949 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1950 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1951 if (ioc_data->receive == 2) { 1952 pr_debug("LEC_ARP: Attaching mcast forward\n"); 1953 #if 0 1954 entry = lec_arp_find(priv, bus_mac); 1955 if (!entry) { 1956 pr_info("LEC_ARP: Multicast entry not found!\n"); 1957 goto out; 1958 } 1959 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1960 entry->recv_vcc = vcc; 1961 entry->old_recv_push = old_push; 1962 #endif 1963 entry = make_entry(priv, bus_mac); 1964 if (entry == NULL) 1965 goto out; 1966 del_timer(&entry->timer); 1967 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1968 entry->recv_vcc = vcc; 1969 entry->old_recv_push = old_push; 1970 hlist_add_head(&entry->next, &priv->mcast_fwds); 1971 goto out; 1972 } else if (ioc_data->receive == 1) { 1973 /* 1974 * Vcc which we don't want to make default vcc, 1975 * attach it anyway. 1976 */ 1977 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n", 1978 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 1979 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 1980 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 1981 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 1982 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 1983 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 1984 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 1985 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 1986 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 1987 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 1988 entry = make_entry(priv, bus_mac); 1989 if (entry == NULL) 1990 goto out; 1991 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1992 eth_zero_addr(entry->mac_addr); 1993 entry->recv_vcc = vcc; 1994 entry->old_recv_push = old_push; 1995 entry->status = ESI_UNKNOWN; 1996 entry->timer.expires = jiffies + priv->vcc_timeout_period; 1997 entry->timer.function = lec_arp_expire_vcc; 1998 hlist_add_head(&entry->next, &priv->lec_no_forward); 1999 add_timer(&entry->timer); 2000 dump_arp_table(priv); 2001 goto out; 2002 } 2003 pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n", 2004 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2005 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2006 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2007 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2008 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2009 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2010 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2011 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2012 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2013 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 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 del_timer(&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(sizeof(struct lec_vcc_priv), GFP_KERNEL); 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 del_timer(&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 del_timer(&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 del_timer(&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_LICENSE("GPL"); 2274