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