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