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 /* TokenRing if needed */ 30 #ifdef CONFIG_TR 31 #include <linux/trdevice.h> 32 #endif 33 34 /* And atm device */ 35 #include <linux/atmdev.h> 36 #include <linux/atmlec.h> 37 38 /* Proxy LEC knows about bridging */ 39 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 40 #include "../bridge/br_private.h" 41 42 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 }; 43 #endif 44 45 /* Modular too */ 46 #include <linux/module.h> 47 #include <linux/init.h> 48 49 #include "lec.h" 50 #include "lec_arpc.h" 51 #include "resources.h" 52 53 #define DUMP_PACKETS 0 /* 54 * 0 = None, 55 * 1 = 30 first bytes 56 * 2 = Whole packet 57 */ 58 59 #define LEC_UNRES_QUE_LEN 8 /* 60 * number of tx packets to queue for a 61 * single destination while waiting for SVC 62 */ 63 64 static int lec_open(struct net_device *dev); 65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 66 struct net_device *dev); 67 static int lec_close(struct net_device *dev); 68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 69 const unsigned char *mac_addr); 70 static int lec_arp_remove(struct lec_priv *priv, 71 struct lec_arp_table *to_remove); 72 /* LANE2 functions */ 73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address, 74 const u8 *tlvs, u32 sizeoftlvs); 75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 76 u8 **tlvs, u32 *sizeoftlvs); 77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 78 const u8 *tlvs, u32 sizeoftlvs); 79 80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 81 unsigned long permanent); 82 static void lec_arp_check_empties(struct lec_priv *priv, 83 struct atm_vcc *vcc, struct sk_buff *skb); 84 static void lec_arp_destroy(struct lec_priv *priv); 85 static void lec_arp_init(struct lec_priv *priv); 86 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 87 const unsigned char *mac_to_find, 88 int is_rdesc, 89 struct lec_arp_table **ret_entry); 90 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 91 const unsigned char *atm_addr, 92 unsigned long remoteflag, 93 unsigned int targetless_le_arp); 94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id); 95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc); 96 static void lec_set_flush_tran_id(struct lec_priv *priv, 97 const unsigned char *atm_addr, 98 unsigned long tran_id); 99 static void lec_vcc_added(struct lec_priv *priv, 100 const struct atmlec_ioc *ioc_data, 101 struct atm_vcc *vcc, 102 void (*old_push)(struct atm_vcc *vcc, 103 struct sk_buff *skb)); 104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc); 105 106 /* must be done under lec_arp_lock */ 107 static inline void lec_arp_hold(struct lec_arp_table *entry) 108 { 109 atomic_inc(&entry->usage); 110 } 111 112 static inline void lec_arp_put(struct lec_arp_table *entry) 113 { 114 if (atomic_dec_and_test(&entry->usage)) 115 kfree(entry); 116 } 117 118 static struct lane2_ops lane2_ops = { 119 lane2_resolve, /* resolve, spec 3.1.3 */ 120 lane2_associate_req, /* associate_req, spec 3.1.4 */ 121 NULL /* associate indicator, spec 3.1.5 */ 122 }; 123 124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 125 126 /* Device structures */ 127 static struct net_device *dev_lec[MAX_LEC_ITF]; 128 129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev) 131 { 132 struct ethhdr *eth; 133 char *buff; 134 struct lec_priv *priv; 135 136 /* 137 * Check if this is a BPDU. If so, ask zeppelin to send 138 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit 139 * as the Config BPDU has 140 */ 141 eth = (struct ethhdr *)skb->data; 142 buff = skb->data + skb->dev->hard_header_len; 143 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) { 144 struct sock *sk; 145 struct sk_buff *skb2; 146 struct atmlec_msg *mesg; 147 148 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 149 if (skb2 == NULL) 150 return; 151 skb2->len = sizeof(struct atmlec_msg); 152 mesg = (struct atmlec_msg *)skb2->data; 153 mesg->type = l_topology_change; 154 buff += 4; 155 mesg->content.normal.flag = *buff & 0x01; 156 /* 0x01 is topology change */ 157 158 priv = netdev_priv(dev); 159 atm_force_charge(priv->lecd, skb2->truesize); 160 sk = sk_atm(priv->lecd); 161 skb_queue_tail(&sk->sk_receive_queue, skb2); 162 sk->sk_data_ready(sk, skb2->len); 163 } 164 } 165 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ 166 167 /* 168 * Modelled after tr_type_trans 169 * All multicast and ARE or STE frames go to BUS. 170 * Non source routed frames go by destination address. 171 * Last hop source routed frames go by destination address. 172 * Not last hop source routed frames go by _next_ route descriptor. 173 * Returns pointer to destination MAC address or fills in rdesc 174 * and returns NULL. 175 */ 176 #ifdef CONFIG_TR 177 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc) 178 { 179 struct trh_hdr *trh; 180 unsigned int riflen, num_rdsc; 181 182 trh = (struct trh_hdr *)packet; 183 if (trh->daddr[0] & (uint8_t) 0x80) 184 return bus_mac; /* multicast */ 185 186 if (trh->saddr[0] & TR_RII) { 187 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8; 188 if ((ntohs(trh->rcf) >> 13) != 0) 189 return bus_mac; /* ARE or STE */ 190 } else 191 return trh->daddr; /* not source routed */ 192 193 if (riflen < 6) 194 return trh->daddr; /* last hop, source routed */ 195 196 /* riflen is 6 or more, packet has more than one route descriptor */ 197 num_rdsc = (riflen / 2) - 1; 198 memset(rdesc, 0, ETH_ALEN); 199 /* offset 4 comes from LAN destination field in LE control frames */ 200 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT)) 201 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16)); 202 else { 203 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16)); 204 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0)); 205 } 206 207 return NULL; 208 } 209 #endif /* CONFIG_TR */ 210 211 /* 212 * Open/initialize the netdevice. This is called (in the current kernel) 213 * sometime after booting when the 'ifconfig' program is run. 214 * 215 * This routine should set everything up anew at each open, even 216 * registers that "should" only need to be set once at boot, so that 217 * there is non-reboot way to recover if something goes wrong. 218 */ 219 220 static int lec_open(struct net_device *dev) 221 { 222 netif_start_queue(dev); 223 memset(&dev->stats, 0, sizeof(struct net_device_stats)); 224 225 return 0; 226 } 227 228 static void 229 lec_send(struct atm_vcc *vcc, struct sk_buff *skb) 230 { 231 struct net_device *dev = skb->dev; 232 233 ATM_SKB(skb)->vcc = vcc; 234 ATM_SKB(skb)->atm_options = vcc->atm_options; 235 236 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 237 if (vcc->send(vcc, skb) < 0) { 238 dev->stats.tx_dropped++; 239 return; 240 } 241 242 dev->stats.tx_packets++; 243 dev->stats.tx_bytes += skb->len; 244 } 245 246 static void lec_tx_timeout(struct net_device *dev) 247 { 248 pr_info("%s\n", dev->name); 249 dev->trans_start = jiffies; 250 netif_wake_queue(dev); 251 } 252 253 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 254 struct net_device *dev) 255 { 256 struct sk_buff *skb2; 257 struct lec_priv *priv = netdev_priv(dev); 258 struct lecdatahdr_8023 *lec_h; 259 struct atm_vcc *vcc; 260 struct lec_arp_table *entry; 261 unsigned char *dst; 262 int min_frame_size; 263 #ifdef CONFIG_TR 264 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */ 265 #endif 266 int is_rdesc; 267 268 pr_debug("called\n"); 269 if (!priv->lecd) { 270 pr_info("%s:No lecd attached\n", dev->name); 271 dev->stats.tx_errors++; 272 netif_stop_queue(dev); 273 kfree_skb(skb); 274 return NETDEV_TX_OK; 275 } 276 277 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n", 278 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb), 279 (long)skb_end_pointer(skb)); 280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 281 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) 282 lec_handle_bridge(skb, dev); 283 #endif 284 285 /* Make sure we have room for lec_id */ 286 if (skb_headroom(skb) < 2) { 287 pr_debug("reallocating skb\n"); 288 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 289 kfree_skb(skb); 290 if (skb2 == NULL) 291 return NETDEV_TX_OK; 292 skb = skb2; 293 } 294 skb_push(skb, 2); 295 296 /* Put le header to place, works for TokenRing too */ 297 lec_h = (struct lecdatahdr_8023 *)skb->data; 298 lec_h->le_header = htons(priv->lecid); 299 300 #ifdef CONFIG_TR 301 /* 302 * Ugly. Use this to realign Token Ring packets for 303 * e.g. PCA-200E driver. 304 */ 305 if (priv->is_trdev) { 306 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 307 kfree_skb(skb); 308 if (skb2 == NULL) 309 return NETDEV_TX_OK; 310 skb = skb2; 311 } 312 #endif 313 314 #if DUMP_PACKETS >= 2 315 #define MAX_DUMP_SKB 99 316 #elif DUMP_PACKETS >= 1 317 #define MAX_DUMP_SKB 30 318 #endif 319 #if DUMP_PACKETS >= 1 320 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n", 321 dev->name, skb->len, priv->lecid); 322 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 323 skb->data, min(skb->len, MAX_DUMP_SKB), true); 324 #endif /* DUMP_PACKETS >= 1 */ 325 326 /* Minimum ethernet-frame size */ 327 #ifdef CONFIG_TR 328 if (priv->is_trdev) 329 min_frame_size = LEC_MINIMUM_8025_SIZE; 330 else 331 #endif 332 min_frame_size = LEC_MINIMUM_8023_SIZE; 333 if (skb->len < min_frame_size) { 334 if ((skb->len + skb_tailroom(skb)) < min_frame_size) { 335 skb2 = skb_copy_expand(skb, 0, 336 min_frame_size - skb->truesize, 337 GFP_ATOMIC); 338 dev_kfree_skb(skb); 339 if (skb2 == NULL) { 340 dev->stats.tx_dropped++; 341 return NETDEV_TX_OK; 342 } 343 skb = skb2; 344 } 345 skb_put(skb, min_frame_size - skb->len); 346 } 347 348 /* Send to right vcc */ 349 is_rdesc = 0; 350 dst = lec_h->h_dest; 351 #ifdef CONFIG_TR 352 if (priv->is_trdev) { 353 dst = get_tr_dst(skb->data + 2, rdesc); 354 if (dst == NULL) { 355 dst = rdesc; 356 is_rdesc = 1; 357 } 358 } 359 #endif 360 entry = NULL; 361 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); 362 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", 363 dev->name, vcc, vcc ? vcc->flags : 0, entry); 364 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) { 365 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { 366 pr_debug("%s:queuing packet, MAC address %pM\n", 367 dev->name, lec_h->h_dest); 368 skb_queue_tail(&entry->tx_wait, skb); 369 } else { 370 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n", 371 dev->name, lec_h->h_dest); 372 dev->stats.tx_dropped++; 373 dev_kfree_skb(skb); 374 } 375 goto out; 376 } 377 #if DUMP_PACKETS > 0 378 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n", 379 dev->name, vcc->vpi, vcc->vci); 380 #endif /* DUMP_PACKETS > 0 */ 381 382 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { 383 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest); 384 lec_send(vcc, skb2); 385 } 386 387 lec_send(vcc, skb); 388 389 if (!atm_may_send(vcc, 0)) { 390 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 391 392 vpriv->xoff = 1; 393 netif_stop_queue(dev); 394 395 /* 396 * vcc->pop() might have occurred in between, making 397 * the vcc usuable again. Since xmit is serialized, 398 * this is the only situation we have to re-test. 399 */ 400 401 if (atm_may_send(vcc, 0)) 402 netif_wake_queue(dev); 403 } 404 405 out: 406 if (entry) 407 lec_arp_put(entry); 408 dev->trans_start = jiffies; 409 return NETDEV_TX_OK; 410 } 411 412 /* The inverse routine to net_open(). */ 413 static int lec_close(struct net_device *dev) 414 { 415 netif_stop_queue(dev); 416 return 0; 417 } 418 419 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 420 { 421 unsigned long flags; 422 struct net_device *dev = (struct net_device *)vcc->proto_data; 423 struct lec_priv *priv = netdev_priv(dev); 424 struct atmlec_msg *mesg; 425 struct lec_arp_table *entry; 426 int i; 427 char *tmp; /* FIXME */ 428 429 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 430 mesg = (struct atmlec_msg *)skb->data; 431 tmp = skb->data; 432 tmp += sizeof(struct atmlec_msg); 433 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type); 434 switch (mesg->type) { 435 case l_set_mac_addr: 436 for (i = 0; i < 6; i++) 437 dev->dev_addr[i] = mesg->content.normal.mac_addr[i]; 438 break; 439 case l_del_mac_addr: 440 for (i = 0; i < 6; i++) 441 dev->dev_addr[i] = 0; 442 break; 443 case l_addr_delete: 444 lec_addr_delete(priv, mesg->content.normal.atm_addr, 445 mesg->content.normal.flag); 446 break; 447 case l_topology_change: 448 priv->topology_change = mesg->content.normal.flag; 449 break; 450 case l_flush_complete: 451 lec_flush_complete(priv, mesg->content.normal.flag); 452 break; 453 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ 454 spin_lock_irqsave(&priv->lec_arp_lock, flags); 455 entry = lec_arp_find(priv, mesg->content.normal.mac_addr); 456 lec_arp_remove(priv, entry); 457 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 458 459 if (mesg->content.normal.no_source_le_narp) 460 break; 461 /* FALL THROUGH */ 462 case l_arp_update: 463 lec_arp_update(priv, mesg->content.normal.mac_addr, 464 mesg->content.normal.atm_addr, 465 mesg->content.normal.flag, 466 mesg->content.normal.targetless_le_arp); 467 pr_debug("in l_arp_update\n"); 468 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ 469 pr_debug("LANE2 3.1.5, got tlvs, size %d\n", 470 mesg->sizeoftlvs); 471 lane2_associate_ind(dev, mesg->content.normal.mac_addr, 472 tmp, mesg->sizeoftlvs); 473 } 474 break; 475 case l_config: 476 priv->maximum_unknown_frame_count = 477 mesg->content.config.maximum_unknown_frame_count; 478 priv->max_unknown_frame_time = 479 (mesg->content.config.max_unknown_frame_time * HZ); 480 priv->max_retry_count = mesg->content.config.max_retry_count; 481 priv->aging_time = (mesg->content.config.aging_time * HZ); 482 priv->forward_delay_time = 483 (mesg->content.config.forward_delay_time * HZ); 484 priv->arp_response_time = 485 (mesg->content.config.arp_response_time * HZ); 486 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ); 487 priv->path_switching_delay = 488 (mesg->content.config.path_switching_delay * HZ); 489 priv->lane_version = mesg->content.config.lane_version; 490 /* LANE2 */ 491 priv->lane2_ops = NULL; 492 if (priv->lane_version > 1) 493 priv->lane2_ops = &lane2_ops; 494 if (dev_set_mtu(dev, mesg->content.config.mtu)) 495 pr_info("%s: change_mtu to %d failed\n", 496 dev->name, mesg->content.config.mtu); 497 priv->is_proxy = mesg->content.config.is_proxy; 498 break; 499 case l_flush_tran_id: 500 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, 501 mesg->content.normal.flag); 502 break; 503 case l_set_lecid: 504 priv->lecid = 505 (unsigned short)(0xffff & mesg->content.normal.flag); 506 break; 507 case l_should_bridge: 508 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 509 { 510 pr_debug("%s: bridge zeppelin asks about %pM\n", 511 dev->name, mesg->content.proxy.mac_addr); 512 513 if (br_fdb_test_addr_hook == NULL) 514 break; 515 516 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) { 517 /* hit from bridge table, send LE_ARP_RESPONSE */ 518 struct sk_buff *skb2; 519 struct sock *sk; 520 521 pr_debug("%s: entry found, responding to zeppelin\n", 522 dev->name); 523 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 524 if (skb2 == NULL) 525 break; 526 skb2->len = sizeof(struct atmlec_msg); 527 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg)); 528 atm_force_charge(priv->lecd, skb2->truesize); 529 sk = sk_atm(priv->lecd); 530 skb_queue_tail(&sk->sk_receive_queue, skb2); 531 sk->sk_data_ready(sk, skb2->len); 532 } 533 } 534 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ 535 break; 536 default: 537 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type); 538 dev_kfree_skb(skb); 539 return -EINVAL; 540 } 541 dev_kfree_skb(skb); 542 return 0; 543 } 544 545 static void lec_atm_close(struct atm_vcc *vcc) 546 { 547 struct sk_buff *skb; 548 struct net_device *dev = (struct net_device *)vcc->proto_data; 549 struct lec_priv *priv = netdev_priv(dev); 550 551 priv->lecd = NULL; 552 /* Do something needful? */ 553 554 netif_stop_queue(dev); 555 lec_arp_destroy(priv); 556 557 if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) 558 pr_info("%s closing with messages pending\n", dev->name); 559 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 560 atm_return(vcc, skb->truesize); 561 dev_kfree_skb(skb); 562 } 563 564 pr_info("%s: Shut down!\n", dev->name); 565 module_put(THIS_MODULE); 566 } 567 568 static struct atmdev_ops lecdev_ops = { 569 .close = lec_atm_close, 570 .send = lec_atm_send 571 }; 572 573 static struct atm_dev lecatm_dev = { 574 .ops = &lecdev_ops, 575 .type = "lec", 576 .number = 999, /* dummy device number */ 577 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock) 578 }; 579 580 /* 581 * LANE2: new argument struct sk_buff *data contains 582 * the LE_ARP based TLVs introduced in the LANE2 spec 583 */ 584 static int 585 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 586 const unsigned char *mac_addr, const unsigned char *atm_addr, 587 struct sk_buff *data) 588 { 589 struct sock *sk; 590 struct sk_buff *skb; 591 struct atmlec_msg *mesg; 592 593 if (!priv || !priv->lecd) 594 return -1; 595 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 596 if (!skb) 597 return -1; 598 skb->len = sizeof(struct atmlec_msg); 599 mesg = (struct atmlec_msg *)skb->data; 600 memset(mesg, 0, sizeof(struct atmlec_msg)); 601 mesg->type = type; 602 if (data != NULL) 603 mesg->sizeoftlvs = data->len; 604 if (mac_addr) 605 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN); 606 else 607 mesg->content.normal.targetless_le_arp = 1; 608 if (atm_addr) 609 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); 610 611 atm_force_charge(priv->lecd, skb->truesize); 612 sk = sk_atm(priv->lecd); 613 skb_queue_tail(&sk->sk_receive_queue, skb); 614 sk->sk_data_ready(sk, skb->len); 615 616 if (data != NULL) { 617 pr_debug("about to send %d bytes of data\n", data->len); 618 atm_force_charge(priv->lecd, data->truesize); 619 skb_queue_tail(&sk->sk_receive_queue, data); 620 sk->sk_data_ready(sk, skb->len); 621 } 622 623 return 0; 624 } 625 626 /* shamelessly stolen from drivers/net/net_init.c */ 627 static int lec_change_mtu(struct net_device *dev, int new_mtu) 628 { 629 if ((new_mtu < 68) || (new_mtu > 18190)) 630 return -EINVAL; 631 dev->mtu = new_mtu; 632 return 0; 633 } 634 635 static void lec_set_multicast_list(struct net_device *dev) 636 { 637 /* 638 * by default, all multicast frames arrive over the bus. 639 * eventually support selective multicast service 640 */ 641 } 642 643 static const struct net_device_ops lec_netdev_ops = { 644 .ndo_open = lec_open, 645 .ndo_stop = lec_close, 646 .ndo_start_xmit = lec_start_xmit, 647 .ndo_change_mtu = lec_change_mtu, 648 .ndo_tx_timeout = lec_tx_timeout, 649 .ndo_set_multicast_list = lec_set_multicast_list, 650 }; 651 652 static const unsigned char lec_ctrl_magic[] = { 653 0xff, 654 0x00, 655 0x01, 656 0x01 657 }; 658 659 #define LEC_DATA_DIRECT_8023 2 660 #define LEC_DATA_DIRECT_8025 3 661 662 static int lec_is_data_direct(struct atm_vcc *vcc) 663 { 664 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) || 665 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025)); 666 } 667 668 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb) 669 { 670 unsigned long flags; 671 struct net_device *dev = (struct net_device *)vcc->proto_data; 672 struct lec_priv *priv = netdev_priv(dev); 673 674 #if DUMP_PACKETS > 0 675 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n", 676 dev->name, vcc->vpi, vcc->vci); 677 #endif 678 if (!skb) { 679 pr_debug("%s: null skb\n", dev->name); 680 lec_vcc_close(priv, vcc); 681 return; 682 } 683 #if DUMP_PACKETS >= 2 684 #define MAX_SKB_DUMP 99 685 #elif DUMP_PACKETS >= 1 686 #define MAX_SKB_DUMP 30 687 #endif 688 #if DUMP_PACKETS > 0 689 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n", 690 dev->name, skb->len, priv->lecid); 691 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 692 skb->data, min(MAX_SKB_DUMP, skb->len), true); 693 #endif /* DUMP_PACKETS > 0 */ 694 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { 695 /* Control frame, to daemon */ 696 struct sock *sk = sk_atm(vcc); 697 698 pr_debug("%s: To daemon\n", dev->name); 699 skb_queue_tail(&sk->sk_receive_queue, skb); 700 sk->sk_data_ready(sk, skb->len); 701 } else { /* Data frame, queue to protocol handlers */ 702 struct lec_arp_table *entry; 703 unsigned char *src, *dst; 704 705 atm_return(vcc, skb->truesize); 706 if (*(__be16 *) skb->data == htons(priv->lecid) || 707 !priv->lecd || !(dev->flags & IFF_UP)) { 708 /* 709 * Probably looping back, or if lecd is missing, 710 * lecd has gone down 711 */ 712 pr_debug("Ignoring frame...\n"); 713 dev_kfree_skb(skb); 714 return; 715 } 716 #ifdef CONFIG_TR 717 if (priv->is_trdev) 718 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest; 719 else 720 #endif 721 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; 722 723 /* 724 * If this is a Data Direct VCC, and the VCC does not match 725 * the LE_ARP cache entry, delete the LE_ARP cache entry. 726 */ 727 spin_lock_irqsave(&priv->lec_arp_lock, flags); 728 if (lec_is_data_direct(vcc)) { 729 #ifdef CONFIG_TR 730 if (priv->is_trdev) 731 src = 732 ((struct lecdatahdr_8025 *)skb->data)-> 733 h_source; 734 else 735 #endif 736 src = 737 ((struct lecdatahdr_8023 *)skb->data)-> 738 h_source; 739 entry = lec_arp_find(priv, src); 740 if (entry && entry->vcc != vcc) { 741 lec_arp_remove(priv, entry); 742 lec_arp_put(entry); 743 } 744 } 745 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 746 747 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */ 748 !priv->is_proxy && /* Proxy wants all the packets */ 749 memcmp(dst, dev->dev_addr, dev->addr_len)) { 750 dev_kfree_skb(skb); 751 return; 752 } 753 if (!hlist_empty(&priv->lec_arp_empty_ones)) 754 lec_arp_check_empties(priv, vcc, skb); 755 skb_pull(skb, 2); /* skip lec_id */ 756 #ifdef CONFIG_TR 757 if (priv->is_trdev) 758 skb->protocol = tr_type_trans(skb, dev); 759 else 760 #endif 761 skb->protocol = eth_type_trans(skb, dev); 762 dev->stats.rx_packets++; 763 dev->stats.rx_bytes += skb->len; 764 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 765 netif_rx(skb); 766 } 767 } 768 769 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) 770 { 771 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 772 struct net_device *dev = skb->dev; 773 774 if (vpriv == NULL) { 775 pr_info("vpriv = NULL!?!?!?\n"); 776 return; 777 } 778 779 vpriv->old_pop(vcc, skb); 780 781 if (vpriv->xoff && atm_may_send(vcc, 0)) { 782 vpriv->xoff = 0; 783 if (netif_running(dev) && netif_queue_stopped(dev)) 784 netif_wake_queue(dev); 785 } 786 } 787 788 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) 789 { 790 struct lec_vcc_priv *vpriv; 791 int bytes_left; 792 struct atmlec_ioc ioc_data; 793 794 /* Lecd must be up in this case */ 795 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); 796 if (bytes_left != 0) 797 pr_info("copy from user failed for %d bytes\n", bytes_left); 798 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF || 799 !dev_lec[ioc_data.dev_num]) 800 return -EINVAL; 801 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 802 if (!vpriv) 803 return -ENOMEM; 804 vpriv->xoff = 0; 805 vpriv->old_pop = vcc->pop; 806 vcc->user_back = vpriv; 807 vcc->pop = lec_pop; 808 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]), 809 &ioc_data, vcc, vcc->push); 810 vcc->proto_data = dev_lec[ioc_data.dev_num]; 811 vcc->push = lec_push; 812 return 0; 813 } 814 815 static int lec_mcast_attach(struct atm_vcc *vcc, int arg) 816 { 817 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg]) 818 return -EINVAL; 819 vcc->proto_data = dev_lec[arg]; 820 return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]), 821 vcc); 822 } 823 824 /* Initialize device. */ 825 static int lecd_attach(struct atm_vcc *vcc, int arg) 826 { 827 int i; 828 struct lec_priv *priv; 829 830 if (arg < 0) 831 i = 0; 832 else 833 i = arg; 834 #ifdef CONFIG_TR 835 if (arg >= MAX_LEC_ITF) 836 return -EINVAL; 837 #else /* Reserve the top NUM_TR_DEVS for TR */ 838 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS)) 839 return -EINVAL; 840 #endif 841 if (!dev_lec[i]) { 842 int is_trdev, size; 843 844 is_trdev = 0; 845 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS)) 846 is_trdev = 1; 847 848 size = sizeof(struct lec_priv); 849 #ifdef CONFIG_TR 850 if (is_trdev) 851 dev_lec[i] = alloc_trdev(size); 852 else 853 #endif 854 dev_lec[i] = alloc_etherdev(size); 855 if (!dev_lec[i]) 856 return -ENOMEM; 857 dev_lec[i]->netdev_ops = &lec_netdev_ops; 858 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 859 if (register_netdev(dev_lec[i])) { 860 free_netdev(dev_lec[i]); 861 return -EINVAL; 862 } 863 864 priv = netdev_priv(dev_lec[i]); 865 priv->is_trdev = is_trdev; 866 } else { 867 priv = netdev_priv(dev_lec[i]); 868 if (priv->lecd) 869 return -EADDRINUSE; 870 } 871 lec_arp_init(priv); 872 priv->itfnum = i; /* LANE2 addition */ 873 priv->lecd = vcc; 874 vcc->dev = &lecatm_dev; 875 vcc_insert_socket(sk_atm(vcc)); 876 877 vcc->proto_data = dev_lec[i]; 878 set_bit(ATM_VF_META, &vcc->flags); 879 set_bit(ATM_VF_READY, &vcc->flags); 880 881 /* Set default values to these variables */ 882 priv->maximum_unknown_frame_count = 1; 883 priv->max_unknown_frame_time = (1 * HZ); 884 priv->vcc_timeout_period = (1200 * HZ); 885 priv->max_retry_count = 1; 886 priv->aging_time = (300 * HZ); 887 priv->forward_delay_time = (15 * HZ); 888 priv->topology_change = 0; 889 priv->arp_response_time = (1 * HZ); 890 priv->flush_timeout = (4 * HZ); 891 priv->path_switching_delay = (6 * HZ); 892 893 if (dev_lec[i]->flags & IFF_UP) 894 netif_start_queue(dev_lec[i]); 895 __module_get(THIS_MODULE); 896 return i; 897 } 898 899 #ifdef CONFIG_PROC_FS 900 static const char *lec_arp_get_status_string(unsigned char status) 901 { 902 static const char *const lec_arp_status_string[] = { 903 "ESI_UNKNOWN ", 904 "ESI_ARP_PENDING ", 905 "ESI_VC_PENDING ", 906 "<Undefined> ", 907 "ESI_FLUSH_PENDING ", 908 "ESI_FORWARD_DIRECT" 909 }; 910 911 if (status > ESI_FORWARD_DIRECT) 912 status = 3; /* ESI_UNDEFINED */ 913 return lec_arp_status_string[status]; 914 } 915 916 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 917 { 918 int i; 919 920 for (i = 0; i < ETH_ALEN; i++) 921 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); 922 seq_printf(seq, " "); 923 for (i = 0; i < ATM_ESA_LEN; i++) 924 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); 925 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), 926 entry->flags & 0xffff); 927 if (entry->vcc) 928 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 929 else 930 seq_printf(seq, " "); 931 if (entry->recv_vcc) { 932 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 933 entry->recv_vcc->vci); 934 } 935 seq_putc(seq, '\n'); 936 } 937 938 struct lec_state { 939 unsigned long flags; 940 struct lec_priv *locked; 941 struct hlist_node *node; 942 struct net_device *dev; 943 int itf; 944 int arp_table; 945 int misc_table; 946 }; 947 948 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 949 loff_t *l) 950 { 951 struct hlist_node *e = state->node; 952 struct lec_arp_table *tmp; 953 954 if (!e) 955 e = tbl->first; 956 if (e == SEQ_START_TOKEN) { 957 e = tbl->first; 958 --*l; 959 } 960 961 hlist_for_each_entry_from(tmp, e, next) { 962 if (--*l < 0) 963 break; 964 } 965 state->node = e; 966 967 return (*l < 0) ? state : NULL; 968 } 969 970 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 971 struct lec_priv *priv) 972 { 973 void *v = NULL; 974 int p; 975 976 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 977 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 978 if (v) 979 break; 980 } 981 state->arp_table = p; 982 return v; 983 } 984 985 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 986 struct lec_priv *priv) 987 { 988 struct hlist_head *lec_misc_tables[] = { 989 &priv->lec_arp_empty_ones, 990 &priv->lec_no_forward, 991 &priv->mcast_fwds 992 }; 993 void *v = NULL; 994 int q; 995 996 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 997 v = lec_tbl_walk(state, lec_misc_tables[q], l); 998 if (v) 999 break; 1000 } 1001 state->misc_table = q; 1002 return v; 1003 } 1004 1005 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 1006 struct lec_priv *priv) 1007 { 1008 if (!state->locked) { 1009 state->locked = priv; 1010 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 1011 } 1012 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 1013 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 1014 state->locked = NULL; 1015 /* Partial state reset for the next time we get called */ 1016 state->arp_table = state->misc_table = 0; 1017 } 1018 return state->locked; 1019 } 1020 1021 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 1022 { 1023 struct net_device *dev; 1024 void *v; 1025 1026 dev = state->dev ? state->dev : dev_lec[state->itf]; 1027 v = (dev && netdev_priv(dev)) ? 1028 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 1029 if (!v && dev) { 1030 dev_put(dev); 1031 /* Partial state reset for the next time we get called */ 1032 dev = NULL; 1033 } 1034 state->dev = dev; 1035 return v; 1036 } 1037 1038 static void *lec_get_idx(struct lec_state *state, loff_t l) 1039 { 1040 void *v = NULL; 1041 1042 for (; state->itf < MAX_LEC_ITF; state->itf++) { 1043 v = lec_itf_walk(state, &l); 1044 if (v) 1045 break; 1046 } 1047 return v; 1048 } 1049 1050 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 1051 { 1052 struct lec_state *state = seq->private; 1053 1054 state->itf = 0; 1055 state->dev = NULL; 1056 state->locked = NULL; 1057 state->arp_table = 0; 1058 state->misc_table = 0; 1059 state->node = SEQ_START_TOKEN; 1060 1061 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 1062 } 1063 1064 static void lec_seq_stop(struct seq_file *seq, void *v) 1065 { 1066 struct lec_state *state = seq->private; 1067 1068 if (state->dev) { 1069 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 1070 state->flags); 1071 dev_put(state->dev); 1072 } 1073 } 1074 1075 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1076 { 1077 struct lec_state *state = seq->private; 1078 1079 v = lec_get_idx(state, 1); 1080 *pos += !!PTR_ERR(v); 1081 return v; 1082 } 1083 1084 static int lec_seq_show(struct seq_file *seq, void *v) 1085 { 1086 static const char lec_banner[] = 1087 "Itf MAC ATM destination" 1088 " Status Flags " 1089 "VPI/VCI Recv VPI/VCI\n"; 1090 1091 if (v == SEQ_START_TOKEN) 1092 seq_puts(seq, lec_banner); 1093 else { 1094 struct lec_state *state = seq->private; 1095 struct net_device *dev = state->dev; 1096 struct lec_arp_table *entry = hlist_entry(state->node, 1097 struct lec_arp_table, 1098 next); 1099 1100 seq_printf(seq, "%s ", dev->name); 1101 lec_info(seq, entry); 1102 } 1103 return 0; 1104 } 1105 1106 static const struct seq_operations lec_seq_ops = { 1107 .start = lec_seq_start, 1108 .next = lec_seq_next, 1109 .stop = lec_seq_stop, 1110 .show = lec_seq_show, 1111 }; 1112 1113 static int lec_seq_open(struct inode *inode, struct file *file) 1114 { 1115 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state)); 1116 } 1117 1118 static const struct file_operations lec_seq_fops = { 1119 .owner = THIS_MODULE, 1120 .open = lec_seq_open, 1121 .read = seq_read, 1122 .llseek = seq_lseek, 1123 .release = seq_release_private, 1124 }; 1125 #endif 1126 1127 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1128 { 1129 struct atm_vcc *vcc = ATM_SD(sock); 1130 int err = 0; 1131 1132 switch (cmd) { 1133 case ATMLEC_CTRL: 1134 case ATMLEC_MCAST: 1135 case ATMLEC_DATA: 1136 if (!capable(CAP_NET_ADMIN)) 1137 return -EPERM; 1138 break; 1139 default: 1140 return -ENOIOCTLCMD; 1141 } 1142 1143 switch (cmd) { 1144 case ATMLEC_CTRL: 1145 err = lecd_attach(vcc, (int)arg); 1146 if (err >= 0) 1147 sock->state = SS_CONNECTED; 1148 break; 1149 case ATMLEC_MCAST: 1150 err = lec_mcast_attach(vcc, (int)arg); 1151 break; 1152 case ATMLEC_DATA: 1153 err = lec_vcc_attach(vcc, (void __user *)arg); 1154 break; 1155 } 1156 1157 return err; 1158 } 1159 1160 static struct atm_ioctl lane_ioctl_ops = { 1161 .owner = THIS_MODULE, 1162 .ioctl = lane_ioctl, 1163 }; 1164 1165 static int __init lane_module_init(void) 1166 { 1167 #ifdef CONFIG_PROC_FS 1168 struct proc_dir_entry *p; 1169 1170 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops); 1171 if (!p) { 1172 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1173 return -ENOMEM; 1174 } 1175 #endif 1176 1177 register_atm_ioctl(&lane_ioctl_ops); 1178 pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n"); 1179 return 0; 1180 } 1181 1182 static void __exit lane_module_cleanup(void) 1183 { 1184 int i; 1185 struct lec_priv *priv; 1186 1187 remove_proc_entry("lec", atm_proc_root); 1188 1189 deregister_atm_ioctl(&lane_ioctl_ops); 1190 1191 for (i = 0; i < MAX_LEC_ITF; i++) { 1192 if (dev_lec[i] != NULL) { 1193 priv = netdev_priv(dev_lec[i]); 1194 unregister_netdev(dev_lec[i]); 1195 free_netdev(dev_lec[i]); 1196 dev_lec[i] = NULL; 1197 } 1198 } 1199 } 1200 1201 module_init(lane_module_init); 1202 module_exit(lane_module_cleanup); 1203 1204 /* 1205 * LANE2: 3.1.3, LE_RESOLVE.request 1206 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1207 * If sizeoftlvs == NULL the default TLVs associated with with this 1208 * lec will be used. 1209 * If dst_mac == NULL, targetless LE_ARP will be sent 1210 */ 1211 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1212 u8 **tlvs, u32 *sizeoftlvs) 1213 { 1214 unsigned long flags; 1215 struct lec_priv *priv = netdev_priv(dev); 1216 struct lec_arp_table *table; 1217 struct sk_buff *skb; 1218 int retval; 1219 1220 if (force == 0) { 1221 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1222 table = lec_arp_find(priv, dst_mac); 1223 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1224 if (table == NULL) 1225 return -1; 1226 1227 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1228 if (*tlvs == NULL) 1229 return -1; 1230 1231 *sizeoftlvs = table->sizeoftlvs; 1232 1233 return 0; 1234 } 1235 1236 if (sizeoftlvs == NULL) 1237 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1238 1239 else { 1240 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1241 if (skb == NULL) 1242 return -1; 1243 skb->len = *sizeoftlvs; 1244 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1245 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1246 } 1247 return retval; 1248 } 1249 1250 /* 1251 * LANE2: 3.1.4, LE_ASSOCIATE.request 1252 * Associate the *tlvs with the *lan_dst address. 1253 * Will overwrite any previous association 1254 * Returns 1 for success, 0 for failure (out of memory) 1255 * 1256 */ 1257 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1258 const u8 *tlvs, u32 sizeoftlvs) 1259 { 1260 int retval; 1261 struct sk_buff *skb; 1262 struct lec_priv *priv = netdev_priv(dev); 1263 1264 if (compare_ether_addr(lan_dst, dev->dev_addr)) 1265 return 0; /* not our mac address */ 1266 1267 kfree(priv->tlvs); /* NULL if there was no previous association */ 1268 1269 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1270 if (priv->tlvs == NULL) 1271 return 0; 1272 priv->sizeoftlvs = sizeoftlvs; 1273 1274 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1275 if (skb == NULL) 1276 return 0; 1277 skb->len = sizeoftlvs; 1278 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1279 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1280 if (retval != 0) 1281 pr_info("lec.c: lane2_associate_req() failed\n"); 1282 /* 1283 * If the previous association has changed we must 1284 * somehow notify other LANE entities about the change 1285 */ 1286 return 1; 1287 } 1288 1289 /* 1290 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1291 * 1292 */ 1293 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1294 const u8 *tlvs, u32 sizeoftlvs) 1295 { 1296 #if 0 1297 int i = 0; 1298 #endif 1299 struct lec_priv *priv = netdev_priv(dev); 1300 #if 0 /* 1301 * Why have the TLVs in LE_ARP entries 1302 * since we do not use them? When you 1303 * uncomment this code, make sure the 1304 * TLVs get freed when entry is killed 1305 */ 1306 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1307 1308 if (entry == NULL) 1309 return; /* should not happen */ 1310 1311 kfree(entry->tlvs); 1312 1313 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1314 if (entry->tlvs == NULL) 1315 return; 1316 entry->sizeoftlvs = sizeoftlvs; 1317 #endif 1318 #if 0 1319 pr_info("\n"); 1320 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1321 while (i < sizeoftlvs) 1322 pr_cont("%02x ", tlvs[i++]); 1323 1324 pr_cont("\n"); 1325 #endif 1326 1327 /* tell MPOA about the TLVs we saw */ 1328 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1329 priv->lane2_ops->associate_indicator(dev, mac_addr, 1330 tlvs, sizeoftlvs); 1331 } 1332 } 1333 1334 /* 1335 * Here starts what used to lec_arpc.c 1336 * 1337 * lec_arpc.c was added here when making 1338 * lane client modular. October 1997 1339 */ 1340 1341 #include <linux/types.h> 1342 #include <linux/timer.h> 1343 #include <linux/param.h> 1344 #include <asm/atomic.h> 1345 #include <linux/inetdevice.h> 1346 #include <net/route.h> 1347 1348 #if 0 1349 #define pr_debug(format, args...) 1350 /* 1351 #define pr_debug printk 1352 */ 1353 #endif 1354 #define DEBUG_ARP_TABLE 0 1355 1356 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1357 1358 static void lec_arp_check_expire(struct work_struct *work); 1359 static void lec_arp_expire_arp(unsigned long data); 1360 1361 /* 1362 * Arp table funcs 1363 */ 1364 1365 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1366 1367 /* 1368 * Initialization of arp-cache 1369 */ 1370 static void lec_arp_init(struct lec_priv *priv) 1371 { 1372 unsigned short i; 1373 1374 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1375 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1376 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1377 INIT_HLIST_HEAD(&priv->lec_no_forward); 1378 INIT_HLIST_HEAD(&priv->mcast_fwds); 1379 spin_lock_init(&priv->lec_arp_lock); 1380 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1381 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1382 } 1383 1384 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1385 { 1386 if (entry->vcc) { 1387 struct atm_vcc *vcc = entry->vcc; 1388 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1389 struct net_device *dev = (struct net_device *)vcc->proto_data; 1390 1391 vcc->pop = vpriv->old_pop; 1392 if (vpriv->xoff) 1393 netif_wake_queue(dev); 1394 kfree(vpriv); 1395 vcc->user_back = NULL; 1396 vcc->push = entry->old_push; 1397 vcc_release_async(vcc, -EPIPE); 1398 entry->vcc = NULL; 1399 } 1400 if (entry->recv_vcc) { 1401 entry->recv_vcc->push = entry->old_recv_push; 1402 vcc_release_async(entry->recv_vcc, -EPIPE); 1403 entry->recv_vcc = NULL; 1404 } 1405 } 1406 1407 /* 1408 * Insert entry to lec_arp_table 1409 * LANE2: Add to the end of the list to satisfy 8.1.13 1410 */ 1411 static inline void 1412 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1413 { 1414 struct hlist_head *tmp; 1415 1416 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1417 hlist_add_head(&entry->next, tmp); 1418 1419 pr_debug("Added entry:%pM\n", entry->mac_addr); 1420 } 1421 1422 /* 1423 * Remove entry from lec_arp_table 1424 */ 1425 static int 1426 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1427 { 1428 struct hlist_node *node; 1429 struct lec_arp_table *entry; 1430 int i, remove_vcc = 1; 1431 1432 if (!to_remove) 1433 return -1; 1434 1435 hlist_del(&to_remove->next); 1436 del_timer(&to_remove->timer); 1437 1438 /* 1439 * If this is the only MAC connected to this VCC, 1440 * also tear down the VCC 1441 */ 1442 if (to_remove->status >= ESI_FLUSH_PENDING) { 1443 /* 1444 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1445 */ 1446 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1447 hlist_for_each_entry(entry, node, 1448 &priv->lec_arp_tables[i], next) { 1449 if (memcmp(to_remove->atm_addr, 1450 entry->atm_addr, ATM_ESA_LEN) == 0) { 1451 remove_vcc = 0; 1452 break; 1453 } 1454 } 1455 } 1456 if (remove_vcc) 1457 lec_arp_clear_vccs(to_remove); 1458 } 1459 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1460 1461 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1462 return 0; 1463 } 1464 1465 #if DEBUG_ARP_TABLE 1466 static const char *get_status_string(unsigned char st) 1467 { 1468 switch (st) { 1469 case ESI_UNKNOWN: 1470 return "ESI_UNKNOWN"; 1471 case ESI_ARP_PENDING: 1472 return "ESI_ARP_PENDING"; 1473 case ESI_VC_PENDING: 1474 return "ESI_VC_PENDING"; 1475 case ESI_FLUSH_PENDING: 1476 return "ESI_FLUSH_PENDING"; 1477 case ESI_FORWARD_DIRECT: 1478 return "ESI_FORWARD_DIRECT"; 1479 } 1480 return "<UNKNOWN>"; 1481 } 1482 1483 static void dump_arp_table(struct lec_priv *priv) 1484 { 1485 struct hlist_node *node; 1486 struct lec_arp_table *rulla; 1487 char buf[256]; 1488 int i, j, offset; 1489 1490 pr_info("Dump %p:\n", priv); 1491 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1492 hlist_for_each_entry(rulla, node, 1493 &priv->lec_arp_tables[i], next) { 1494 offset = 0; 1495 offset += sprintf(buf, "%d: %p\n", i, rulla); 1496 offset += sprintf(buf + offset, "Mac: %pM", 1497 rulla->mac_addr); 1498 offset += sprintf(buf + offset, " Atm:"); 1499 for (j = 0; j < ATM_ESA_LEN; j++) { 1500 offset += sprintf(buf + offset, 1501 "%2.2x ", 1502 rulla->atm_addr[j] & 0xff); 1503 } 1504 offset += sprintf(buf + offset, 1505 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1506 rulla->vcc ? rulla->vcc->vpi : 0, 1507 rulla->vcc ? rulla->vcc->vci : 0, 1508 rulla->recv_vcc ? rulla->recv_vcc-> 1509 vpi : 0, 1510 rulla->recv_vcc ? rulla->recv_vcc-> 1511 vci : 0, rulla->last_used, 1512 rulla->timestamp, rulla->no_tries); 1513 offset += 1514 sprintf(buf + offset, 1515 "Flags:%x, Packets_flooded:%x, Status: %s ", 1516 rulla->flags, rulla->packets_flooded, 1517 get_status_string(rulla->status)); 1518 pr_info("%s\n", buf); 1519 } 1520 } 1521 1522 if (!hlist_empty(&priv->lec_no_forward)) 1523 pr_info("No forward\n"); 1524 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) { 1525 offset = 0; 1526 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1527 offset += sprintf(buf + offset, " Atm:"); 1528 for (j = 0; j < ATM_ESA_LEN; j++) { 1529 offset += sprintf(buf + offset, "%2.2x ", 1530 rulla->atm_addr[j] & 0xff); 1531 } 1532 offset += sprintf(buf + offset, 1533 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1534 rulla->vcc ? rulla->vcc->vpi : 0, 1535 rulla->vcc ? rulla->vcc->vci : 0, 1536 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1537 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1538 rulla->last_used, 1539 rulla->timestamp, rulla->no_tries); 1540 offset += sprintf(buf + offset, 1541 "Flags:%x, Packets_flooded:%x, Status: %s ", 1542 rulla->flags, rulla->packets_flooded, 1543 get_status_string(rulla->status)); 1544 pr_info("%s\n", buf); 1545 } 1546 1547 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1548 pr_info("Empty ones\n"); 1549 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) { 1550 offset = 0; 1551 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1552 offset += sprintf(buf + offset, " Atm:"); 1553 for (j = 0; j < ATM_ESA_LEN; j++) { 1554 offset += sprintf(buf + offset, "%2.2x ", 1555 rulla->atm_addr[j] & 0xff); 1556 } 1557 offset += sprintf(buf + offset, 1558 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1559 rulla->vcc ? rulla->vcc->vpi : 0, 1560 rulla->vcc ? rulla->vcc->vci : 0, 1561 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1562 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1563 rulla->last_used, 1564 rulla->timestamp, rulla->no_tries); 1565 offset += sprintf(buf + offset, 1566 "Flags:%x, Packets_flooded:%x, Status: %s ", 1567 rulla->flags, rulla->packets_flooded, 1568 get_status_string(rulla->status)); 1569 pr_info("%s", buf); 1570 } 1571 1572 if (!hlist_empty(&priv->mcast_fwds)) 1573 pr_info("Multicast Forward VCCs\n"); 1574 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) { 1575 offset = 0; 1576 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1577 offset += sprintf(buf + offset, " Atm:"); 1578 for (j = 0; j < ATM_ESA_LEN; j++) { 1579 offset += sprintf(buf + offset, "%2.2x ", 1580 rulla->atm_addr[j] & 0xff); 1581 } 1582 offset += sprintf(buf + offset, 1583 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1584 rulla->vcc ? rulla->vcc->vpi : 0, 1585 rulla->vcc ? rulla->vcc->vci : 0, 1586 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1587 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1588 rulla->last_used, 1589 rulla->timestamp, rulla->no_tries); 1590 offset += sprintf(buf + offset, 1591 "Flags:%x, Packets_flooded:%x, Status: %s ", 1592 rulla->flags, rulla->packets_flooded, 1593 get_status_string(rulla->status)); 1594 pr_info("%s\n", buf); 1595 } 1596 1597 } 1598 #else 1599 #define dump_arp_table(priv) do { } while (0) 1600 #endif 1601 1602 /* 1603 * Destruction of arp-cache 1604 */ 1605 static void lec_arp_destroy(struct lec_priv *priv) 1606 { 1607 unsigned long flags; 1608 struct hlist_node *node, *next; 1609 struct lec_arp_table *entry; 1610 int i; 1611 1612 cancel_rearming_delayed_work(&priv->lec_arp_work); 1613 1614 /* 1615 * Remove all entries 1616 */ 1617 1618 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1619 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1620 hlist_for_each_entry_safe(entry, node, next, 1621 &priv->lec_arp_tables[i], next) { 1622 lec_arp_remove(priv, entry); 1623 lec_arp_put(entry); 1624 } 1625 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1626 } 1627 1628 hlist_for_each_entry_safe(entry, node, next, 1629 &priv->lec_arp_empty_ones, next) { 1630 del_timer_sync(&entry->timer); 1631 lec_arp_clear_vccs(entry); 1632 hlist_del(&entry->next); 1633 lec_arp_put(entry); 1634 } 1635 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1636 1637 hlist_for_each_entry_safe(entry, node, next, 1638 &priv->lec_no_forward, next) { 1639 del_timer_sync(&entry->timer); 1640 lec_arp_clear_vccs(entry); 1641 hlist_del(&entry->next); 1642 lec_arp_put(entry); 1643 } 1644 INIT_HLIST_HEAD(&priv->lec_no_forward); 1645 1646 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 1647 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1648 lec_arp_clear_vccs(entry); 1649 hlist_del(&entry->next); 1650 lec_arp_put(entry); 1651 } 1652 INIT_HLIST_HEAD(&priv->mcast_fwds); 1653 priv->mcast_vcc = NULL; 1654 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1655 } 1656 1657 /* 1658 * Find entry by mac_address 1659 */ 1660 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1661 const unsigned char *mac_addr) 1662 { 1663 struct hlist_node *node; 1664 struct hlist_head *head; 1665 struct lec_arp_table *entry; 1666 1667 pr_debug("%pM\n", mac_addr); 1668 1669 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1670 hlist_for_each_entry(entry, node, head, next) { 1671 if (!compare_ether_addr(mac_addr, entry->mac_addr)) 1672 return entry; 1673 } 1674 return NULL; 1675 } 1676 1677 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1678 const unsigned char *mac_addr) 1679 { 1680 struct lec_arp_table *to_return; 1681 1682 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1683 if (!to_return) { 1684 pr_info("LEC: Arp entry kmalloc failed\n"); 1685 return NULL; 1686 } 1687 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN); 1688 INIT_HLIST_NODE(&to_return->next); 1689 setup_timer(&to_return->timer, lec_arp_expire_arp, 1690 (unsigned long)to_return); 1691 to_return->last_used = jiffies; 1692 to_return->priv = priv; 1693 skb_queue_head_init(&to_return->tx_wait); 1694 atomic_set(&to_return->usage, 1); 1695 return to_return; 1696 } 1697 1698 /* Arp sent timer expired */ 1699 static void lec_arp_expire_arp(unsigned long data) 1700 { 1701 struct lec_arp_table *entry; 1702 1703 entry = (struct lec_arp_table *)data; 1704 1705 pr_debug("\n"); 1706 if (entry->status == ESI_ARP_PENDING) { 1707 if (entry->no_tries <= entry->priv->max_retry_count) { 1708 if (entry->is_rdesc) 1709 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1710 entry->mac_addr, NULL, NULL); 1711 else 1712 send_to_lecd(entry->priv, l_arp_xmt, 1713 entry->mac_addr, NULL, NULL); 1714 entry->no_tries++; 1715 } 1716 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1717 } 1718 } 1719 1720 /* Unknown/unused vcc expire, remove associated entry */ 1721 static void lec_arp_expire_vcc(unsigned long data) 1722 { 1723 unsigned long flags; 1724 struct lec_arp_table *to_remove = (struct lec_arp_table *)data; 1725 struct lec_priv *priv = (struct lec_priv *)to_remove->priv; 1726 1727 del_timer(&to_remove->timer); 1728 1729 pr_debug("%p %p: vpi:%d vci:%d\n", 1730 to_remove, priv, 1731 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1732 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1733 1734 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1735 hlist_del(&to_remove->next); 1736 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1737 1738 lec_arp_clear_vccs(to_remove); 1739 lec_arp_put(to_remove); 1740 } 1741 1742 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1743 unsigned long now, 1744 struct lec_priv *priv) 1745 { 1746 unsigned long time_to_check; 1747 1748 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1749 time_to_check = priv->forward_delay_time; 1750 else 1751 time_to_check = priv->aging_time; 1752 1753 pr_debug("About to expire: %lx - %lx > %lx\n", 1754 now, entry->last_used, time_to_check); 1755 if (time_after(now, entry->last_used + time_to_check) && 1756 !(entry->flags & LEC_PERMANENT_FLAG) && 1757 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1758 /* Remove entry */ 1759 pr_debug("Entry timed out\n"); 1760 lec_arp_remove(priv, entry); 1761 lec_arp_put(entry); 1762 } else { 1763 /* Something else */ 1764 if ((entry->status == ESI_VC_PENDING || 1765 entry->status == ESI_ARP_PENDING) && 1766 time_after_eq(now, entry->timestamp + 1767 priv->max_unknown_frame_time)) { 1768 entry->timestamp = jiffies; 1769 entry->packets_flooded = 0; 1770 if (entry->status == ESI_VC_PENDING) 1771 send_to_lecd(priv, l_svc_setup, 1772 entry->mac_addr, 1773 entry->atm_addr, 1774 NULL); 1775 } 1776 if (entry->status == ESI_FLUSH_PENDING && 1777 time_after_eq(now, entry->timestamp + 1778 priv->path_switching_delay)) { 1779 lec_arp_hold(entry); 1780 return true; 1781 } 1782 } 1783 1784 return false; 1785 } 1786 /* 1787 * Expire entries. 1788 * 1. Re-set timer 1789 * 2. For each entry, delete entries that have aged past the age limit. 1790 * 3. For each entry, depending on the status of the entry, perform 1791 * the following maintenance. 1792 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1793 * tick_count is above the max_unknown_frame_time, clear 1794 * the tick_count to zero and clear the packets_flooded counter 1795 * to zero. This supports the packet rate limit per address 1796 * while flooding unknowns. 1797 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1798 * than or equal to the path_switching_delay, change the status 1799 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1800 * regardless of the progress of the flush protocol. 1801 */ 1802 static void lec_arp_check_expire(struct work_struct *work) 1803 { 1804 unsigned long flags; 1805 struct lec_priv *priv = 1806 container_of(work, struct lec_priv, lec_arp_work.work); 1807 struct hlist_node *node, *next; 1808 struct lec_arp_table *entry; 1809 unsigned long now; 1810 int i; 1811 1812 pr_debug("%p\n", priv); 1813 now = jiffies; 1814 restart: 1815 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1816 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1817 hlist_for_each_entry_safe(entry, node, next, 1818 &priv->lec_arp_tables[i], next) { 1819 if (__lec_arp_check_expire(entry, now, priv)) { 1820 struct sk_buff *skb; 1821 struct atm_vcc *vcc = entry->vcc; 1822 1823 spin_unlock_irqrestore(&priv->lec_arp_lock, 1824 flags); 1825 while ((skb = skb_dequeue(&entry->tx_wait))) 1826 lec_send(vcc, skb); 1827 entry->last_used = jiffies; 1828 entry->status = ESI_FORWARD_DIRECT; 1829 lec_arp_put(entry); 1830 1831 goto restart; 1832 } 1833 } 1834 } 1835 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1836 1837 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1838 } 1839 1840 /* 1841 * Try to find vcc where mac_address is attached. 1842 * 1843 */ 1844 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1845 const unsigned char *mac_to_find, 1846 int is_rdesc, 1847 struct lec_arp_table **ret_entry) 1848 { 1849 unsigned long flags; 1850 struct lec_arp_table *entry; 1851 struct atm_vcc *found; 1852 1853 if (mac_to_find[0] & 0x01) { 1854 switch (priv->lane_version) { 1855 case 1: 1856 return priv->mcast_vcc; 1857 case 2: /* LANE2 wants arp for multicast addresses */ 1858 if (!compare_ether_addr(mac_to_find, bus_mac)) 1859 return priv->mcast_vcc; 1860 break; 1861 default: 1862 break; 1863 } 1864 } 1865 1866 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1867 entry = lec_arp_find(priv, mac_to_find); 1868 1869 if (entry) { 1870 if (entry->status == ESI_FORWARD_DIRECT) { 1871 /* Connection Ok */ 1872 entry->last_used = jiffies; 1873 lec_arp_hold(entry); 1874 *ret_entry = entry; 1875 found = entry->vcc; 1876 goto out; 1877 } 1878 /* 1879 * If the LE_ARP cache entry is still pending, reset count to 0 1880 * so another LE_ARP request can be made for this frame. 1881 */ 1882 if (entry->status == ESI_ARP_PENDING) 1883 entry->no_tries = 0; 1884 /* 1885 * Data direct VC not yet set up, check to see if the unknown 1886 * frame count is greater than the limit. If the limit has 1887 * not been reached, allow the caller to send packet to 1888 * BUS. 1889 */ 1890 if (entry->status != ESI_FLUSH_PENDING && 1891 entry->packets_flooded < 1892 priv->maximum_unknown_frame_count) { 1893 entry->packets_flooded++; 1894 pr_debug("Flooding..\n"); 1895 found = priv->mcast_vcc; 1896 goto out; 1897 } 1898 /* 1899 * We got here because entry->status == ESI_FLUSH_PENDING 1900 * or BUS flood limit was reached for an entry which is 1901 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1902 */ 1903 lec_arp_hold(entry); 1904 *ret_entry = entry; 1905 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1906 entry->vcc); 1907 found = NULL; 1908 } else { 1909 /* No matching entry was found */ 1910 entry = make_entry(priv, mac_to_find); 1911 pr_debug("Making entry\n"); 1912 if (!entry) { 1913 found = priv->mcast_vcc; 1914 goto out; 1915 } 1916 lec_arp_add(priv, entry); 1917 /* We want arp-request(s) to be sent */ 1918 entry->packets_flooded = 1; 1919 entry->status = ESI_ARP_PENDING; 1920 entry->no_tries = 1; 1921 entry->last_used = entry->timestamp = jiffies; 1922 entry->is_rdesc = is_rdesc; 1923 if (entry->is_rdesc) 1924 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1925 NULL); 1926 else 1927 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1928 entry->timer.expires = jiffies + (1 * HZ); 1929 entry->timer.function = lec_arp_expire_arp; 1930 add_timer(&entry->timer); 1931 found = priv->mcast_vcc; 1932 } 1933 1934 out: 1935 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1936 return found; 1937 } 1938 1939 static int 1940 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1941 unsigned long permanent) 1942 { 1943 unsigned long flags; 1944 struct hlist_node *node, *next; 1945 struct lec_arp_table *entry; 1946 int i; 1947 1948 pr_debug("\n"); 1949 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1950 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1951 hlist_for_each_entry_safe(entry, node, next, 1952 &priv->lec_arp_tables[i], next) { 1953 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1954 (permanent || 1955 !(entry->flags & LEC_PERMANENT_FLAG))) { 1956 lec_arp_remove(priv, entry); 1957 lec_arp_put(entry); 1958 } 1959 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1960 return 0; 1961 } 1962 } 1963 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1964 return -1; 1965 } 1966 1967 /* 1968 * Notifies: Response to arp_request (atm_addr != NULL) 1969 */ 1970 static void 1971 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1972 const unsigned char *atm_addr, unsigned long remoteflag, 1973 unsigned int targetless_le_arp) 1974 { 1975 unsigned long flags; 1976 struct hlist_node *node, *next; 1977 struct lec_arp_table *entry, *tmp; 1978 int i; 1979 1980 pr_debug("%smac:%pM\n", 1981 (targetless_le_arp) ? "targetless " : "", mac_addr); 1982 1983 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1984 entry = lec_arp_find(priv, mac_addr); 1985 if (entry == NULL && targetless_le_arp) 1986 goto out; /* 1987 * LANE2: ignore targetless LE_ARPs for which 1988 * we have no entry in the cache. 7.1.30 1989 */ 1990 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1991 hlist_for_each_entry_safe(entry, node, next, 1992 &priv->lec_arp_empty_ones, next) { 1993 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1994 hlist_del(&entry->next); 1995 del_timer(&entry->timer); 1996 tmp = lec_arp_find(priv, mac_addr); 1997 if (tmp) { 1998 del_timer(&tmp->timer); 1999 tmp->status = ESI_FORWARD_DIRECT; 2000 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 2001 tmp->vcc = entry->vcc; 2002 tmp->old_push = entry->old_push; 2003 tmp->last_used = jiffies; 2004 del_timer(&entry->timer); 2005 lec_arp_put(entry); 2006 entry = tmp; 2007 } else { 2008 entry->status = ESI_FORWARD_DIRECT; 2009 memcpy(entry->mac_addr, mac_addr, ETH_ALEN); 2010 entry->last_used = jiffies; 2011 lec_arp_add(priv, entry); 2012 } 2013 if (remoteflag) 2014 entry->flags |= LEC_REMOTE_FLAG; 2015 else 2016 entry->flags &= ~LEC_REMOTE_FLAG; 2017 pr_debug("After update\n"); 2018 dump_arp_table(priv); 2019 goto out; 2020 } 2021 } 2022 } 2023 2024 entry = lec_arp_find(priv, mac_addr); 2025 if (!entry) { 2026 entry = make_entry(priv, mac_addr); 2027 if (!entry) 2028 goto out; 2029 entry->status = ESI_UNKNOWN; 2030 lec_arp_add(priv, entry); 2031 /* Temporary, changes before end of function */ 2032 } 2033 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 2034 del_timer(&entry->timer); 2035 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2036 hlist_for_each_entry(tmp, node, 2037 &priv->lec_arp_tables[i], next) { 2038 if (entry != tmp && 2039 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 2040 /* Vcc to this host exists */ 2041 if (tmp->status > ESI_VC_PENDING) { 2042 /* 2043 * ESI_FLUSH_PENDING, 2044 * ESI_FORWARD_DIRECT 2045 */ 2046 entry->vcc = tmp->vcc; 2047 entry->old_push = tmp->old_push; 2048 } 2049 entry->status = tmp->status; 2050 break; 2051 } 2052 } 2053 } 2054 if (remoteflag) 2055 entry->flags |= LEC_REMOTE_FLAG; 2056 else 2057 entry->flags &= ~LEC_REMOTE_FLAG; 2058 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 2059 entry->status = ESI_VC_PENDING; 2060 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 2061 } 2062 pr_debug("After update2\n"); 2063 dump_arp_table(priv); 2064 out: 2065 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2066 } 2067 2068 /* 2069 * Notifies: Vcc setup ready 2070 */ 2071 static void 2072 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 2073 struct atm_vcc *vcc, 2074 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 2075 { 2076 unsigned long flags; 2077 struct hlist_node *node; 2078 struct lec_arp_table *entry; 2079 int i, found_entry = 0; 2080 2081 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2082 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2083 if (ioc_data->receive == 2) { 2084 pr_debug("LEC_ARP: Attaching mcast forward\n"); 2085 #if 0 2086 entry = lec_arp_find(priv, bus_mac); 2087 if (!entry) { 2088 pr_info("LEC_ARP: Multicast entry not found!\n"); 2089 goto out; 2090 } 2091 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2092 entry->recv_vcc = vcc; 2093 entry->old_recv_push = old_push; 2094 #endif 2095 entry = make_entry(priv, bus_mac); 2096 if (entry == NULL) 2097 goto out; 2098 del_timer(&entry->timer); 2099 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2100 entry->recv_vcc = vcc; 2101 entry->old_recv_push = old_push; 2102 hlist_add_head(&entry->next, &priv->mcast_fwds); 2103 goto out; 2104 } else if (ioc_data->receive == 1) { 2105 /* 2106 * Vcc which we don't want to make default vcc, 2107 * attach it anyway. 2108 */ 2109 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", 2110 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2111 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2112 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2113 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2114 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2115 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2116 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2117 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2118 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2119 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2120 entry = make_entry(priv, bus_mac); 2121 if (entry == NULL) 2122 goto out; 2123 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2124 memset(entry->mac_addr, 0, ETH_ALEN); 2125 entry->recv_vcc = vcc; 2126 entry->old_recv_push = old_push; 2127 entry->status = ESI_UNKNOWN; 2128 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2129 entry->timer.function = lec_arp_expire_vcc; 2130 hlist_add_head(&entry->next, &priv->lec_no_forward); 2131 add_timer(&entry->timer); 2132 dump_arp_table(priv); 2133 goto out; 2134 } 2135 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", 2136 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2137 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2138 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2139 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2140 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2141 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2142 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2143 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2144 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2145 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2146 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2147 hlist_for_each_entry(entry, node, 2148 &priv->lec_arp_tables[i], next) { 2149 if (memcmp 2150 (ioc_data->atm_addr, entry->atm_addr, 2151 ATM_ESA_LEN) == 0) { 2152 pr_debug("LEC_ARP: Attaching data direct\n"); 2153 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 2154 entry->vcc ? entry->vcc->vci : 0, 2155 entry->recv_vcc ? entry->recv_vcc-> 2156 vci : 0); 2157 found_entry = 1; 2158 del_timer(&entry->timer); 2159 entry->vcc = vcc; 2160 entry->old_push = old_push; 2161 if (entry->status == ESI_VC_PENDING) { 2162 if (priv->maximum_unknown_frame_count 2163 == 0) 2164 entry->status = 2165 ESI_FORWARD_DIRECT; 2166 else { 2167 entry->timestamp = jiffies; 2168 entry->status = 2169 ESI_FLUSH_PENDING; 2170 #if 0 2171 send_to_lecd(priv, l_flush_xmt, 2172 NULL, 2173 entry->atm_addr, 2174 NULL); 2175 #endif 2176 } 2177 } else { 2178 /* 2179 * They were forming a connection 2180 * to us, and we to them. Our 2181 * ATM address is numerically lower 2182 * than theirs, so we make connection 2183 * we formed into default VCC (8.1.11). 2184 * Connection they made gets torn 2185 * down. This might confuse some 2186 * clients. Can be changed if 2187 * someone reports trouble... 2188 */ 2189 ; 2190 } 2191 } 2192 } 2193 } 2194 if (found_entry) { 2195 pr_debug("After vcc was added\n"); 2196 dump_arp_table(priv); 2197 goto out; 2198 } 2199 /* 2200 * Not found, snatch address from first data packet that arrives 2201 * from this vcc 2202 */ 2203 entry = make_entry(priv, bus_mac); 2204 if (!entry) 2205 goto out; 2206 entry->vcc = vcc; 2207 entry->old_push = old_push; 2208 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2209 memset(entry->mac_addr, 0, ETH_ALEN); 2210 entry->status = ESI_UNKNOWN; 2211 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2212 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2213 entry->timer.function = lec_arp_expire_vcc; 2214 add_timer(&entry->timer); 2215 pr_debug("After vcc was added\n"); 2216 dump_arp_table(priv); 2217 out: 2218 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2219 } 2220 2221 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2222 { 2223 unsigned long flags; 2224 struct hlist_node *node; 2225 struct lec_arp_table *entry; 2226 int i; 2227 2228 pr_debug("%lx\n", tran_id); 2229 restart: 2230 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2231 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2232 hlist_for_each_entry(entry, node, 2233 &priv->lec_arp_tables[i], next) { 2234 if (entry->flush_tran_id == tran_id && 2235 entry->status == ESI_FLUSH_PENDING) { 2236 struct sk_buff *skb; 2237 struct atm_vcc *vcc = entry->vcc; 2238 2239 lec_arp_hold(entry); 2240 spin_unlock_irqrestore(&priv->lec_arp_lock, 2241 flags); 2242 while ((skb = skb_dequeue(&entry->tx_wait))) 2243 lec_send(vcc, skb); 2244 entry->last_used = jiffies; 2245 entry->status = ESI_FORWARD_DIRECT; 2246 lec_arp_put(entry); 2247 pr_debug("LEC_ARP: Flushed\n"); 2248 goto restart; 2249 } 2250 } 2251 } 2252 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2253 dump_arp_table(priv); 2254 } 2255 2256 static void 2257 lec_set_flush_tran_id(struct lec_priv *priv, 2258 const unsigned char *atm_addr, unsigned long tran_id) 2259 { 2260 unsigned long flags; 2261 struct hlist_node *node; 2262 struct lec_arp_table *entry; 2263 int i; 2264 2265 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2266 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2267 hlist_for_each_entry(entry, node, 2268 &priv->lec_arp_tables[i], next) { 2269 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2270 entry->flush_tran_id = tran_id; 2271 pr_debug("Set flush transaction id to %lx for %p\n", 2272 tran_id, entry); 2273 } 2274 } 2275 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2276 } 2277 2278 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2279 { 2280 unsigned long flags; 2281 unsigned char mac_addr[] = { 2282 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2283 }; 2284 struct lec_arp_table *to_add; 2285 struct lec_vcc_priv *vpriv; 2286 int err = 0; 2287 2288 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 2289 if (!vpriv) 2290 return -ENOMEM; 2291 vpriv->xoff = 0; 2292 vpriv->old_pop = vcc->pop; 2293 vcc->user_back = vpriv; 2294 vcc->pop = lec_pop; 2295 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2296 to_add = make_entry(priv, mac_addr); 2297 if (!to_add) { 2298 vcc->pop = vpriv->old_pop; 2299 kfree(vpriv); 2300 err = -ENOMEM; 2301 goto out; 2302 } 2303 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2304 to_add->status = ESI_FORWARD_DIRECT; 2305 to_add->flags |= LEC_PERMANENT_FLAG; 2306 to_add->vcc = vcc; 2307 to_add->old_push = vcc->push; 2308 vcc->push = lec_push; 2309 priv->mcast_vcc = vcc; 2310 lec_arp_add(priv, to_add); 2311 out: 2312 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2313 return err; 2314 } 2315 2316 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2317 { 2318 unsigned long flags; 2319 struct hlist_node *node, *next; 2320 struct lec_arp_table *entry; 2321 int i; 2322 2323 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2324 dump_arp_table(priv); 2325 2326 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2327 2328 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2329 hlist_for_each_entry_safe(entry, node, next, 2330 &priv->lec_arp_tables[i], next) { 2331 if (vcc == entry->vcc) { 2332 lec_arp_remove(priv, entry); 2333 lec_arp_put(entry); 2334 if (priv->mcast_vcc == vcc) 2335 priv->mcast_vcc = NULL; 2336 } 2337 } 2338 } 2339 2340 hlist_for_each_entry_safe(entry, node, next, 2341 &priv->lec_arp_empty_ones, next) { 2342 if (entry->vcc == vcc) { 2343 lec_arp_clear_vccs(entry); 2344 del_timer(&entry->timer); 2345 hlist_del(&entry->next); 2346 lec_arp_put(entry); 2347 } 2348 } 2349 2350 hlist_for_each_entry_safe(entry, node, next, 2351 &priv->lec_no_forward, next) { 2352 if (entry->recv_vcc == vcc) { 2353 lec_arp_clear_vccs(entry); 2354 del_timer(&entry->timer); 2355 hlist_del(&entry->next); 2356 lec_arp_put(entry); 2357 } 2358 } 2359 2360 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 2361 if (entry->recv_vcc == vcc) { 2362 lec_arp_clear_vccs(entry); 2363 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2364 hlist_del(&entry->next); 2365 lec_arp_put(entry); 2366 } 2367 } 2368 2369 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2370 dump_arp_table(priv); 2371 } 2372 2373 static void 2374 lec_arp_check_empties(struct lec_priv *priv, 2375 struct atm_vcc *vcc, struct sk_buff *skb) 2376 { 2377 unsigned long flags; 2378 struct hlist_node *node, *next; 2379 struct lec_arp_table *entry, *tmp; 2380 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2381 unsigned char *src; 2382 #ifdef CONFIG_TR 2383 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data; 2384 2385 if (priv->is_trdev) 2386 src = tr_hdr->h_source; 2387 else 2388 #endif 2389 src = hdr->h_source; 2390 2391 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2392 hlist_for_each_entry_safe(entry, node, next, 2393 &priv->lec_arp_empty_ones, next) { 2394 if (vcc == entry->vcc) { 2395 del_timer(&entry->timer); 2396 memcpy(entry->mac_addr, src, ETH_ALEN); 2397 entry->status = ESI_FORWARD_DIRECT; 2398 entry->last_used = jiffies; 2399 /* We might have got an entry */ 2400 tmp = lec_arp_find(priv, src); 2401 if (tmp) { 2402 lec_arp_remove(priv, tmp); 2403 lec_arp_put(tmp); 2404 } 2405 hlist_del(&entry->next); 2406 lec_arp_add(priv, entry); 2407 goto out; 2408 } 2409 } 2410 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2411 out: 2412 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2413 } 2414 2415 MODULE_LICENSE("GPL"); 2416