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 return; 166 } 167 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ 168 169 /* 170 * Modelled after tr_type_trans 171 * All multicast and ARE or STE frames go to BUS. 172 * Non source routed frames go by destination address. 173 * Last hop source routed frames go by destination address. 174 * Not last hop source routed frames go by _next_ route descriptor. 175 * Returns pointer to destination MAC address or fills in rdesc 176 * and returns NULL. 177 */ 178 #ifdef CONFIG_TR 179 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc) 180 { 181 struct trh_hdr *trh; 182 unsigned int riflen, num_rdsc; 183 184 trh = (struct trh_hdr *)packet; 185 if (trh->daddr[0] & (uint8_t) 0x80) 186 return bus_mac; /* multicast */ 187 188 if (trh->saddr[0] & TR_RII) { 189 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8; 190 if ((ntohs(trh->rcf) >> 13) != 0) 191 return bus_mac; /* ARE or STE */ 192 } else 193 return trh->daddr; /* not source routed */ 194 195 if (riflen < 6) 196 return trh->daddr; /* last hop, source routed */ 197 198 /* riflen is 6 or more, packet has more than one route descriptor */ 199 num_rdsc = (riflen / 2) - 1; 200 memset(rdesc, 0, ETH_ALEN); 201 /* offset 4 comes from LAN destination field in LE control frames */ 202 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT)) 203 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16)); 204 else { 205 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16)); 206 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0)); 207 } 208 209 return NULL; 210 } 211 #endif /* CONFIG_TR */ 212 213 /* 214 * Open/initialize the netdevice. This is called (in the current kernel) 215 * sometime after booting when the 'ifconfig' program is run. 216 * 217 * This routine should set everything up anew at each open, even 218 * registers that "should" only need to be set once at boot, so that 219 * there is non-reboot way to recover if something goes wrong. 220 */ 221 222 static int lec_open(struct net_device *dev) 223 { 224 netif_start_queue(dev); 225 memset(&dev->stats, 0, sizeof(struct net_device_stats)); 226 227 return 0; 228 } 229 230 static void 231 lec_send(struct atm_vcc *vcc, struct sk_buff *skb) 232 { 233 struct net_device *dev = skb->dev; 234 235 ATM_SKB(skb)->vcc = vcc; 236 ATM_SKB(skb)->atm_options = vcc->atm_options; 237 238 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 239 if (vcc->send(vcc, skb) < 0) { 240 dev->stats.tx_dropped++; 241 return; 242 } 243 244 dev->stats.tx_packets++; 245 dev->stats.tx_bytes += skb->len; 246 } 247 248 static void lec_tx_timeout(struct net_device *dev) 249 { 250 pr_info("%s\n", dev->name); 251 dev->trans_start = jiffies; 252 netif_wake_queue(dev); 253 } 254 255 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 256 struct net_device *dev) 257 { 258 struct sk_buff *skb2; 259 struct lec_priv *priv = netdev_priv(dev); 260 struct lecdatahdr_8023 *lec_h; 261 struct atm_vcc *vcc; 262 struct lec_arp_table *entry; 263 unsigned char *dst; 264 int min_frame_size; 265 #ifdef CONFIG_TR 266 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */ 267 #endif 268 int is_rdesc; 269 270 pr_debug("called\n"); 271 if (!priv->lecd) { 272 pr_info("%s:No lecd attached\n", dev->name); 273 dev->stats.tx_errors++; 274 netif_stop_queue(dev); 275 kfree_skb(skb); 276 return NETDEV_TX_OK; 277 } 278 279 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n", 280 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb), 281 (long)skb_end_pointer(skb)); 282 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 283 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) 284 lec_handle_bridge(skb, dev); 285 #endif 286 287 /* Make sure we have room for lec_id */ 288 if (skb_headroom(skb) < 2) { 289 pr_debug("reallocating skb\n"); 290 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 291 kfree_skb(skb); 292 if (skb2 == NULL) 293 return NETDEV_TX_OK; 294 skb = skb2; 295 } 296 skb_push(skb, 2); 297 298 /* Put le header to place, works for TokenRing too */ 299 lec_h = (struct lecdatahdr_8023 *)skb->data; 300 lec_h->le_header = htons(priv->lecid); 301 302 #ifdef CONFIG_TR 303 /* 304 * Ugly. Use this to realign Token Ring packets for 305 * e.g. PCA-200E driver. 306 */ 307 if (priv->is_trdev) { 308 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 309 kfree_skb(skb); 310 if (skb2 == NULL) 311 return NETDEV_TX_OK; 312 skb = skb2; 313 } 314 #endif 315 316 #if DUMP_PACKETS >= 2 317 #define MAX_DUMP_SKB 99 318 #elif DUMP_PACKETS >= 1 319 #define MAX_DUMP_SKB 30 320 #endif 321 #if DUMP_PACKETS >= 1 322 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n", 323 dev->name, skb->len, priv->lecid); 324 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 325 skb->data, min(skb->len, MAX_DUMP_SKB), true); 326 #endif /* DUMP_PACKETS >= 1 */ 327 328 /* Minimum ethernet-frame size */ 329 #ifdef CONFIG_TR 330 if (priv->is_trdev) 331 min_frame_size = LEC_MINIMUM_8025_SIZE; 332 else 333 #endif 334 min_frame_size = LEC_MINIMUM_8023_SIZE; 335 if (skb->len < min_frame_size) { 336 if ((skb->len + skb_tailroom(skb)) < min_frame_size) { 337 skb2 = skb_copy_expand(skb, 0, 338 min_frame_size - skb->truesize, 339 GFP_ATOMIC); 340 dev_kfree_skb(skb); 341 if (skb2 == NULL) { 342 dev->stats.tx_dropped++; 343 return NETDEV_TX_OK; 344 } 345 skb = skb2; 346 } 347 skb_put(skb, min_frame_size - skb->len); 348 } 349 350 /* Send to right vcc */ 351 is_rdesc = 0; 352 dst = lec_h->h_dest; 353 #ifdef CONFIG_TR 354 if (priv->is_trdev) { 355 dst = get_tr_dst(skb->data + 2, rdesc); 356 if (dst == NULL) { 357 dst = rdesc; 358 is_rdesc = 1; 359 } 360 } 361 #endif 362 entry = NULL; 363 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); 364 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", 365 dev->name, vcc, vcc ? vcc->flags : 0, entry); 366 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) { 367 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { 368 pr_debug("%s:queuing packet, MAC address %pM\n", 369 dev->name, lec_h->h_dest); 370 skb_queue_tail(&entry->tx_wait, skb); 371 } else { 372 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n", 373 dev->name, lec_h->h_dest); 374 dev->stats.tx_dropped++; 375 dev_kfree_skb(skb); 376 } 377 goto out; 378 } 379 #if DUMP_PACKETS > 0 380 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n", 381 dev->name, vcc->vpi, vcc->vci); 382 #endif /* DUMP_PACKETS > 0 */ 383 384 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { 385 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest); 386 lec_send(vcc, skb2); 387 } 388 389 lec_send(vcc, skb); 390 391 if (!atm_may_send(vcc, 0)) { 392 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 393 394 vpriv->xoff = 1; 395 netif_stop_queue(dev); 396 397 /* 398 * vcc->pop() might have occurred in between, making 399 * the vcc usuable again. Since xmit is serialized, 400 * this is the only situation we have to re-test. 401 */ 402 403 if (atm_may_send(vcc, 0)) 404 netif_wake_queue(dev); 405 } 406 407 out: 408 if (entry) 409 lec_arp_put(entry); 410 dev->trans_start = jiffies; 411 return NETDEV_TX_OK; 412 } 413 414 /* The inverse routine to net_open(). */ 415 static int lec_close(struct net_device *dev) 416 { 417 netif_stop_queue(dev); 418 return 0; 419 } 420 421 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 422 { 423 unsigned long flags; 424 struct net_device *dev = (struct net_device *)vcc->proto_data; 425 struct lec_priv *priv = netdev_priv(dev); 426 struct atmlec_msg *mesg; 427 struct lec_arp_table *entry; 428 int i; 429 char *tmp; /* FIXME */ 430 431 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 432 mesg = (struct atmlec_msg *)skb->data; 433 tmp = skb->data; 434 tmp += sizeof(struct atmlec_msg); 435 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type); 436 switch (mesg->type) { 437 case l_set_mac_addr: 438 for (i = 0; i < 6; i++) 439 dev->dev_addr[i] = mesg->content.normal.mac_addr[i]; 440 break; 441 case l_del_mac_addr: 442 for (i = 0; i < 6; i++) 443 dev->dev_addr[i] = 0; 444 break; 445 case l_addr_delete: 446 lec_addr_delete(priv, mesg->content.normal.atm_addr, 447 mesg->content.normal.flag); 448 break; 449 case l_topology_change: 450 priv->topology_change = mesg->content.normal.flag; 451 break; 452 case l_flush_complete: 453 lec_flush_complete(priv, mesg->content.normal.flag); 454 break; 455 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ 456 spin_lock_irqsave(&priv->lec_arp_lock, flags); 457 entry = lec_arp_find(priv, mesg->content.normal.mac_addr); 458 lec_arp_remove(priv, entry); 459 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 460 461 if (mesg->content.normal.no_source_le_narp) 462 break; 463 /* FALL THROUGH */ 464 case l_arp_update: 465 lec_arp_update(priv, mesg->content.normal.mac_addr, 466 mesg->content.normal.atm_addr, 467 mesg->content.normal.flag, 468 mesg->content.normal.targetless_le_arp); 469 pr_debug("in l_arp_update\n"); 470 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ 471 pr_debug("LANE2 3.1.5, got tlvs, size %d\n", 472 mesg->sizeoftlvs); 473 lane2_associate_ind(dev, mesg->content.normal.mac_addr, 474 tmp, mesg->sizeoftlvs); 475 } 476 break; 477 case l_config: 478 priv->maximum_unknown_frame_count = 479 mesg->content.config.maximum_unknown_frame_count; 480 priv->max_unknown_frame_time = 481 (mesg->content.config.max_unknown_frame_time * HZ); 482 priv->max_retry_count = mesg->content.config.max_retry_count; 483 priv->aging_time = (mesg->content.config.aging_time * HZ); 484 priv->forward_delay_time = 485 (mesg->content.config.forward_delay_time * HZ); 486 priv->arp_response_time = 487 (mesg->content.config.arp_response_time * HZ); 488 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ); 489 priv->path_switching_delay = 490 (mesg->content.config.path_switching_delay * HZ); 491 priv->lane_version = mesg->content.config.lane_version; 492 /* LANE2 */ 493 priv->lane2_ops = NULL; 494 if (priv->lane_version > 1) 495 priv->lane2_ops = &lane2_ops; 496 if (dev_set_mtu(dev, mesg->content.config.mtu)) 497 pr_info("%s: change_mtu to %d failed\n", 498 dev->name, mesg->content.config.mtu); 499 priv->is_proxy = mesg->content.config.is_proxy; 500 break; 501 case l_flush_tran_id: 502 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, 503 mesg->content.normal.flag); 504 break; 505 case l_set_lecid: 506 priv->lecid = 507 (unsigned short)(0xffff & mesg->content.normal.flag); 508 break; 509 case l_should_bridge: 510 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) 511 { 512 pr_debug("%s: bridge zeppelin asks about %pM\n", 513 dev->name, mesg->content.proxy.mac_addr); 514 515 if (br_fdb_test_addr_hook == NULL) 516 break; 517 518 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) { 519 /* hit from bridge table, send LE_ARP_RESPONSE */ 520 struct sk_buff *skb2; 521 struct sock *sk; 522 523 pr_debug("%s: entry found, responding to zeppelin\n", 524 dev->name); 525 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 526 if (skb2 == NULL) 527 break; 528 skb2->len = sizeof(struct atmlec_msg); 529 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg)); 530 atm_force_charge(priv->lecd, skb2->truesize); 531 sk = sk_atm(priv->lecd); 532 skb_queue_tail(&sk->sk_receive_queue, skb2); 533 sk->sk_data_ready(sk, skb2->len); 534 } 535 } 536 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ 537 break; 538 default: 539 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type); 540 dev_kfree_skb(skb); 541 return -EINVAL; 542 } 543 dev_kfree_skb(skb); 544 return 0; 545 } 546 547 static void lec_atm_close(struct atm_vcc *vcc) 548 { 549 struct sk_buff *skb; 550 struct net_device *dev = (struct net_device *)vcc->proto_data; 551 struct lec_priv *priv = netdev_priv(dev); 552 553 priv->lecd = NULL; 554 /* Do something needful? */ 555 556 netif_stop_queue(dev); 557 lec_arp_destroy(priv); 558 559 if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) 560 pr_info("%s closing with messages pending\n", dev->name); 561 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 562 atm_return(vcc, skb->truesize); 563 dev_kfree_skb(skb); 564 } 565 566 pr_info("%s: Shut down!\n", dev->name); 567 module_put(THIS_MODULE); 568 } 569 570 static struct atmdev_ops lecdev_ops = { 571 .close = lec_atm_close, 572 .send = lec_atm_send 573 }; 574 575 static struct atm_dev lecatm_dev = { 576 .ops = &lecdev_ops, 577 .type = "lec", 578 .number = 999, /* dummy device number */ 579 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock) 580 }; 581 582 /* 583 * LANE2: new argument struct sk_buff *data contains 584 * the LE_ARP based TLVs introduced in the LANE2 spec 585 */ 586 static int 587 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 588 const unsigned char *mac_addr, const unsigned char *atm_addr, 589 struct sk_buff *data) 590 { 591 struct sock *sk; 592 struct sk_buff *skb; 593 struct atmlec_msg *mesg; 594 595 if (!priv || !priv->lecd) 596 return -1; 597 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 598 if (!skb) 599 return -1; 600 skb->len = sizeof(struct atmlec_msg); 601 mesg = (struct atmlec_msg *)skb->data; 602 memset(mesg, 0, sizeof(struct atmlec_msg)); 603 mesg->type = type; 604 if (data != NULL) 605 mesg->sizeoftlvs = data->len; 606 if (mac_addr) 607 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN); 608 else 609 mesg->content.normal.targetless_le_arp = 1; 610 if (atm_addr) 611 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); 612 613 atm_force_charge(priv->lecd, skb->truesize); 614 sk = sk_atm(priv->lecd); 615 skb_queue_tail(&sk->sk_receive_queue, skb); 616 sk->sk_data_ready(sk, skb->len); 617 618 if (data != NULL) { 619 pr_debug("about to send %d bytes of data\n", data->len); 620 atm_force_charge(priv->lecd, data->truesize); 621 skb_queue_tail(&sk->sk_receive_queue, data); 622 sk->sk_data_ready(sk, skb->len); 623 } 624 625 return 0; 626 } 627 628 /* shamelessly stolen from drivers/net/net_init.c */ 629 static int lec_change_mtu(struct net_device *dev, int new_mtu) 630 { 631 if ((new_mtu < 68) || (new_mtu > 18190)) 632 return -EINVAL; 633 dev->mtu = new_mtu; 634 return 0; 635 } 636 637 static void lec_set_multicast_list(struct net_device *dev) 638 { 639 /* 640 * by default, all multicast frames arrive over the bus. 641 * eventually support selective multicast service 642 */ 643 return; 644 } 645 646 static const struct net_device_ops lec_netdev_ops = { 647 .ndo_open = lec_open, 648 .ndo_stop = lec_close, 649 .ndo_start_xmit = lec_start_xmit, 650 .ndo_change_mtu = lec_change_mtu, 651 .ndo_tx_timeout = lec_tx_timeout, 652 .ndo_set_multicast_list = lec_set_multicast_list, 653 }; 654 655 static const unsigned char lec_ctrl_magic[] = { 656 0xff, 657 0x00, 658 0x01, 659 0x01 660 }; 661 662 #define LEC_DATA_DIRECT_8023 2 663 #define LEC_DATA_DIRECT_8025 3 664 665 static int lec_is_data_direct(struct atm_vcc *vcc) 666 { 667 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) || 668 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025)); 669 } 670 671 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb) 672 { 673 unsigned long flags; 674 struct net_device *dev = (struct net_device *)vcc->proto_data; 675 struct lec_priv *priv = netdev_priv(dev); 676 677 #if DUMP_PACKETS > 0 678 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n", 679 dev->name, vcc->vpi, vcc->vci); 680 #endif 681 if (!skb) { 682 pr_debug("%s: null skb\n", dev->name); 683 lec_vcc_close(priv, vcc); 684 return; 685 } 686 #if DUMP_PACKETS >= 2 687 #define MAX_SKB_DUMP 99 688 #elif DUMP_PACKETS >= 1 689 #define MAX_SKB_DUMP 30 690 #endif 691 #if DUMP_PACKETS > 0 692 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n", 693 dev->name, skb->len, priv->lecid); 694 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 695 skb->data, min(MAX_SKB_DUMP, skb->len), true); 696 #endif /* DUMP_PACKETS > 0 */ 697 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { 698 /* Control frame, to daemon */ 699 struct sock *sk = sk_atm(vcc); 700 701 pr_debug("%s: To daemon\n", dev->name); 702 skb_queue_tail(&sk->sk_receive_queue, skb); 703 sk->sk_data_ready(sk, skb->len); 704 } else { /* Data frame, queue to protocol handlers */ 705 struct lec_arp_table *entry; 706 unsigned char *src, *dst; 707 708 atm_return(vcc, skb->truesize); 709 if (*(__be16 *) skb->data == htons(priv->lecid) || 710 !priv->lecd || !(dev->flags & IFF_UP)) { 711 /* 712 * Probably looping back, or if lecd is missing, 713 * lecd has gone down 714 */ 715 pr_debug("Ignoring frame...\n"); 716 dev_kfree_skb(skb); 717 return; 718 } 719 #ifdef CONFIG_TR 720 if (priv->is_trdev) 721 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest; 722 else 723 #endif 724 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; 725 726 /* 727 * If this is a Data Direct VCC, and the VCC does not match 728 * the LE_ARP cache entry, delete the LE_ARP cache entry. 729 */ 730 spin_lock_irqsave(&priv->lec_arp_lock, flags); 731 if (lec_is_data_direct(vcc)) { 732 #ifdef CONFIG_TR 733 if (priv->is_trdev) 734 src = 735 ((struct lecdatahdr_8025 *)skb->data)-> 736 h_source; 737 else 738 #endif 739 src = 740 ((struct lecdatahdr_8023 *)skb->data)-> 741 h_source; 742 entry = lec_arp_find(priv, src); 743 if (entry && entry->vcc != vcc) { 744 lec_arp_remove(priv, entry); 745 lec_arp_put(entry); 746 } 747 } 748 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 749 750 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */ 751 !priv->is_proxy && /* Proxy wants all the packets */ 752 memcmp(dst, dev->dev_addr, dev->addr_len)) { 753 dev_kfree_skb(skb); 754 return; 755 } 756 if (!hlist_empty(&priv->lec_arp_empty_ones)) 757 lec_arp_check_empties(priv, vcc, skb); 758 skb_pull(skb, 2); /* skip lec_id */ 759 #ifdef CONFIG_TR 760 if (priv->is_trdev) 761 skb->protocol = tr_type_trans(skb, dev); 762 else 763 #endif 764 skb->protocol = eth_type_trans(skb, dev); 765 dev->stats.rx_packets++; 766 dev->stats.rx_bytes += skb->len; 767 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 768 netif_rx(skb); 769 } 770 } 771 772 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) 773 { 774 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 775 struct net_device *dev = skb->dev; 776 777 if (vpriv == NULL) { 778 pr_info("vpriv = NULL!?!?!?\n"); 779 return; 780 } 781 782 vpriv->old_pop(vcc, skb); 783 784 if (vpriv->xoff && atm_may_send(vcc, 0)) { 785 vpriv->xoff = 0; 786 if (netif_running(dev) && netif_queue_stopped(dev)) 787 netif_wake_queue(dev); 788 } 789 } 790 791 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) 792 { 793 struct lec_vcc_priv *vpriv; 794 int bytes_left; 795 struct atmlec_ioc ioc_data; 796 797 /* Lecd must be up in this case */ 798 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); 799 if (bytes_left != 0) 800 pr_info("copy from user failed for %d bytes\n", bytes_left); 801 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF || 802 !dev_lec[ioc_data.dev_num]) 803 return -EINVAL; 804 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 805 if (!vpriv) 806 return -ENOMEM; 807 vpriv->xoff = 0; 808 vpriv->old_pop = vcc->pop; 809 vcc->user_back = vpriv; 810 vcc->pop = lec_pop; 811 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]), 812 &ioc_data, vcc, vcc->push); 813 vcc->proto_data = dev_lec[ioc_data.dev_num]; 814 vcc->push = lec_push; 815 return 0; 816 } 817 818 static int lec_mcast_attach(struct atm_vcc *vcc, int arg) 819 { 820 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg]) 821 return -EINVAL; 822 vcc->proto_data = dev_lec[arg]; 823 return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]), 824 vcc); 825 } 826 827 /* Initialize device. */ 828 static int lecd_attach(struct atm_vcc *vcc, int arg) 829 { 830 int i; 831 struct lec_priv *priv; 832 833 if (arg < 0) 834 i = 0; 835 else 836 i = arg; 837 #ifdef CONFIG_TR 838 if (arg >= MAX_LEC_ITF) 839 return -EINVAL; 840 #else /* Reserve the top NUM_TR_DEVS for TR */ 841 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS)) 842 return -EINVAL; 843 #endif 844 if (!dev_lec[i]) { 845 int is_trdev, size; 846 847 is_trdev = 0; 848 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS)) 849 is_trdev = 1; 850 851 size = sizeof(struct lec_priv); 852 #ifdef CONFIG_TR 853 if (is_trdev) 854 dev_lec[i] = alloc_trdev(size); 855 else 856 #endif 857 dev_lec[i] = alloc_etherdev(size); 858 if (!dev_lec[i]) 859 return -ENOMEM; 860 dev_lec[i]->netdev_ops = &lec_netdev_ops; 861 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 862 if (register_netdev(dev_lec[i])) { 863 free_netdev(dev_lec[i]); 864 return -EINVAL; 865 } 866 867 priv = netdev_priv(dev_lec[i]); 868 priv->is_trdev = is_trdev; 869 } else { 870 priv = netdev_priv(dev_lec[i]); 871 if (priv->lecd) 872 return -EADDRINUSE; 873 } 874 lec_arp_init(priv); 875 priv->itfnum = i; /* LANE2 addition */ 876 priv->lecd = vcc; 877 vcc->dev = &lecatm_dev; 878 vcc_insert_socket(sk_atm(vcc)); 879 880 vcc->proto_data = dev_lec[i]; 881 set_bit(ATM_VF_META, &vcc->flags); 882 set_bit(ATM_VF_READY, &vcc->flags); 883 884 /* Set default values to these variables */ 885 priv->maximum_unknown_frame_count = 1; 886 priv->max_unknown_frame_time = (1 * HZ); 887 priv->vcc_timeout_period = (1200 * HZ); 888 priv->max_retry_count = 1; 889 priv->aging_time = (300 * HZ); 890 priv->forward_delay_time = (15 * HZ); 891 priv->topology_change = 0; 892 priv->arp_response_time = (1 * HZ); 893 priv->flush_timeout = (4 * HZ); 894 priv->path_switching_delay = (6 * HZ); 895 896 if (dev_lec[i]->flags & IFF_UP) 897 netif_start_queue(dev_lec[i]); 898 __module_get(THIS_MODULE); 899 return i; 900 } 901 902 #ifdef CONFIG_PROC_FS 903 static const char *lec_arp_get_status_string(unsigned char status) 904 { 905 static const char *const lec_arp_status_string[] = { 906 "ESI_UNKNOWN ", 907 "ESI_ARP_PENDING ", 908 "ESI_VC_PENDING ", 909 "<Undefined> ", 910 "ESI_FLUSH_PENDING ", 911 "ESI_FORWARD_DIRECT" 912 }; 913 914 if (status > ESI_FORWARD_DIRECT) 915 status = 3; /* ESI_UNDEFINED */ 916 return lec_arp_status_string[status]; 917 } 918 919 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 920 { 921 int i; 922 923 for (i = 0; i < ETH_ALEN; i++) 924 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); 925 seq_printf(seq, " "); 926 for (i = 0; i < ATM_ESA_LEN; i++) 927 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); 928 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), 929 entry->flags & 0xffff); 930 if (entry->vcc) 931 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 932 else 933 seq_printf(seq, " "); 934 if (entry->recv_vcc) { 935 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 936 entry->recv_vcc->vci); 937 } 938 seq_putc(seq, '\n'); 939 } 940 941 struct lec_state { 942 unsigned long flags; 943 struct lec_priv *locked; 944 struct hlist_node *node; 945 struct net_device *dev; 946 int itf; 947 int arp_table; 948 int misc_table; 949 }; 950 951 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 952 loff_t *l) 953 { 954 struct hlist_node *e = state->node; 955 struct lec_arp_table *tmp; 956 957 if (!e) 958 e = tbl->first; 959 if (e == SEQ_START_TOKEN) { 960 e = tbl->first; 961 --*l; 962 } 963 964 hlist_for_each_entry_from(tmp, e, next) { 965 if (--*l < 0) 966 break; 967 } 968 state->node = e; 969 970 return (*l < 0) ? state : NULL; 971 } 972 973 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 974 struct lec_priv *priv) 975 { 976 void *v = NULL; 977 int p; 978 979 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 980 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 981 if (v) 982 break; 983 } 984 state->arp_table = p; 985 return v; 986 } 987 988 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 989 struct lec_priv *priv) 990 { 991 struct hlist_head *lec_misc_tables[] = { 992 &priv->lec_arp_empty_ones, 993 &priv->lec_no_forward, 994 &priv->mcast_fwds 995 }; 996 void *v = NULL; 997 int q; 998 999 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 1000 v = lec_tbl_walk(state, lec_misc_tables[q], l); 1001 if (v) 1002 break; 1003 } 1004 state->misc_table = q; 1005 return v; 1006 } 1007 1008 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 1009 struct lec_priv *priv) 1010 { 1011 if (!state->locked) { 1012 state->locked = priv; 1013 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 1014 } 1015 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 1016 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 1017 state->locked = NULL; 1018 /* Partial state reset for the next time we get called */ 1019 state->arp_table = state->misc_table = 0; 1020 } 1021 return state->locked; 1022 } 1023 1024 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 1025 { 1026 struct net_device *dev; 1027 void *v; 1028 1029 dev = state->dev ? state->dev : dev_lec[state->itf]; 1030 v = (dev && netdev_priv(dev)) ? 1031 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 1032 if (!v && dev) { 1033 dev_put(dev); 1034 /* Partial state reset for the next time we get called */ 1035 dev = NULL; 1036 } 1037 state->dev = dev; 1038 return v; 1039 } 1040 1041 static void *lec_get_idx(struct lec_state *state, loff_t l) 1042 { 1043 void *v = NULL; 1044 1045 for (; state->itf < MAX_LEC_ITF; state->itf++) { 1046 v = lec_itf_walk(state, &l); 1047 if (v) 1048 break; 1049 } 1050 return v; 1051 } 1052 1053 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 1054 { 1055 struct lec_state *state = seq->private; 1056 1057 state->itf = 0; 1058 state->dev = NULL; 1059 state->locked = NULL; 1060 state->arp_table = 0; 1061 state->misc_table = 0; 1062 state->node = SEQ_START_TOKEN; 1063 1064 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 1065 } 1066 1067 static void lec_seq_stop(struct seq_file *seq, void *v) 1068 { 1069 struct lec_state *state = seq->private; 1070 1071 if (state->dev) { 1072 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 1073 state->flags); 1074 dev_put(state->dev); 1075 } 1076 } 1077 1078 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1079 { 1080 struct lec_state *state = seq->private; 1081 1082 v = lec_get_idx(state, 1); 1083 *pos += !!PTR_ERR(v); 1084 return v; 1085 } 1086 1087 static int lec_seq_show(struct seq_file *seq, void *v) 1088 { 1089 static const char lec_banner[] = 1090 "Itf MAC ATM destination" 1091 " Status Flags " 1092 "VPI/VCI Recv VPI/VCI\n"; 1093 1094 if (v == SEQ_START_TOKEN) 1095 seq_puts(seq, lec_banner); 1096 else { 1097 struct lec_state *state = seq->private; 1098 struct net_device *dev = state->dev; 1099 struct lec_arp_table *entry = hlist_entry(state->node, 1100 struct lec_arp_table, 1101 next); 1102 1103 seq_printf(seq, "%s ", dev->name); 1104 lec_info(seq, entry); 1105 } 1106 return 0; 1107 } 1108 1109 static const struct seq_operations lec_seq_ops = { 1110 .start = lec_seq_start, 1111 .next = lec_seq_next, 1112 .stop = lec_seq_stop, 1113 .show = lec_seq_show, 1114 }; 1115 1116 static int lec_seq_open(struct inode *inode, struct file *file) 1117 { 1118 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state)); 1119 } 1120 1121 static const struct file_operations lec_seq_fops = { 1122 .owner = THIS_MODULE, 1123 .open = lec_seq_open, 1124 .read = seq_read, 1125 .llseek = seq_lseek, 1126 .release = seq_release_private, 1127 }; 1128 #endif 1129 1130 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1131 { 1132 struct atm_vcc *vcc = ATM_SD(sock); 1133 int err = 0; 1134 1135 switch (cmd) { 1136 case ATMLEC_CTRL: 1137 case ATMLEC_MCAST: 1138 case ATMLEC_DATA: 1139 if (!capable(CAP_NET_ADMIN)) 1140 return -EPERM; 1141 break; 1142 default: 1143 return -ENOIOCTLCMD; 1144 } 1145 1146 switch (cmd) { 1147 case ATMLEC_CTRL: 1148 err = lecd_attach(vcc, (int)arg); 1149 if (err >= 0) 1150 sock->state = SS_CONNECTED; 1151 break; 1152 case ATMLEC_MCAST: 1153 err = lec_mcast_attach(vcc, (int)arg); 1154 break; 1155 case ATMLEC_DATA: 1156 err = lec_vcc_attach(vcc, (void __user *)arg); 1157 break; 1158 } 1159 1160 return err; 1161 } 1162 1163 static struct atm_ioctl lane_ioctl_ops = { 1164 .owner = THIS_MODULE, 1165 .ioctl = lane_ioctl, 1166 }; 1167 1168 static int __init lane_module_init(void) 1169 { 1170 #ifdef CONFIG_PROC_FS 1171 struct proc_dir_entry *p; 1172 1173 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops); 1174 if (!p) { 1175 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1176 return -ENOMEM; 1177 } 1178 #endif 1179 1180 register_atm_ioctl(&lane_ioctl_ops); 1181 pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n"); 1182 return 0; 1183 } 1184 1185 static void __exit lane_module_cleanup(void) 1186 { 1187 int i; 1188 struct lec_priv *priv; 1189 1190 remove_proc_entry("lec", atm_proc_root); 1191 1192 deregister_atm_ioctl(&lane_ioctl_ops); 1193 1194 for (i = 0; i < MAX_LEC_ITF; i++) { 1195 if (dev_lec[i] != NULL) { 1196 priv = netdev_priv(dev_lec[i]); 1197 unregister_netdev(dev_lec[i]); 1198 free_netdev(dev_lec[i]); 1199 dev_lec[i] = NULL; 1200 } 1201 } 1202 1203 return; 1204 } 1205 1206 module_init(lane_module_init); 1207 module_exit(lane_module_cleanup); 1208 1209 /* 1210 * LANE2: 3.1.3, LE_RESOLVE.request 1211 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1212 * If sizeoftlvs == NULL the default TLVs associated with with this 1213 * lec will be used. 1214 * If dst_mac == NULL, targetless LE_ARP will be sent 1215 */ 1216 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1217 u8 **tlvs, u32 *sizeoftlvs) 1218 { 1219 unsigned long flags; 1220 struct lec_priv *priv = netdev_priv(dev); 1221 struct lec_arp_table *table; 1222 struct sk_buff *skb; 1223 int retval; 1224 1225 if (force == 0) { 1226 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1227 table = lec_arp_find(priv, dst_mac); 1228 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1229 if (table == NULL) 1230 return -1; 1231 1232 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1233 if (*tlvs == NULL) 1234 return -1; 1235 1236 *sizeoftlvs = table->sizeoftlvs; 1237 1238 return 0; 1239 } 1240 1241 if (sizeoftlvs == NULL) 1242 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1243 1244 else { 1245 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1246 if (skb == NULL) 1247 return -1; 1248 skb->len = *sizeoftlvs; 1249 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1250 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1251 } 1252 return retval; 1253 } 1254 1255 /* 1256 * LANE2: 3.1.4, LE_ASSOCIATE.request 1257 * Associate the *tlvs with the *lan_dst address. 1258 * Will overwrite any previous association 1259 * Returns 1 for success, 0 for failure (out of memory) 1260 * 1261 */ 1262 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1263 const u8 *tlvs, u32 sizeoftlvs) 1264 { 1265 int retval; 1266 struct sk_buff *skb; 1267 struct lec_priv *priv = netdev_priv(dev); 1268 1269 if (compare_ether_addr(lan_dst, dev->dev_addr)) 1270 return 0; /* not our mac address */ 1271 1272 kfree(priv->tlvs); /* NULL if there was no previous association */ 1273 1274 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1275 if (priv->tlvs == NULL) 1276 return 0; 1277 priv->sizeoftlvs = sizeoftlvs; 1278 1279 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1280 if (skb == NULL) 1281 return 0; 1282 skb->len = sizeoftlvs; 1283 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1284 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1285 if (retval != 0) 1286 pr_info("lec.c: lane2_associate_req() failed\n"); 1287 /* 1288 * If the previous association has changed we must 1289 * somehow notify other LANE entities about the change 1290 */ 1291 return 1; 1292 } 1293 1294 /* 1295 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1296 * 1297 */ 1298 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1299 const u8 *tlvs, u32 sizeoftlvs) 1300 { 1301 #if 0 1302 int i = 0; 1303 #endif 1304 struct lec_priv *priv = netdev_priv(dev); 1305 #if 0 /* 1306 * Why have the TLVs in LE_ARP entries 1307 * since we do not use them? When you 1308 * uncomment this code, make sure the 1309 * TLVs get freed when entry is killed 1310 */ 1311 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1312 1313 if (entry == NULL) 1314 return; /* should not happen */ 1315 1316 kfree(entry->tlvs); 1317 1318 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1319 if (entry->tlvs == NULL) 1320 return; 1321 entry->sizeoftlvs = sizeoftlvs; 1322 #endif 1323 #if 0 1324 pr_info("\n"); 1325 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1326 while (i < sizeoftlvs) 1327 pr_cont("%02x ", tlvs[i++]); 1328 1329 pr_cont("\n"); 1330 #endif 1331 1332 /* tell MPOA about the TLVs we saw */ 1333 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1334 priv->lane2_ops->associate_indicator(dev, mac_addr, 1335 tlvs, sizeoftlvs); 1336 } 1337 return; 1338 } 1339 1340 /* 1341 * Here starts what used to lec_arpc.c 1342 * 1343 * lec_arpc.c was added here when making 1344 * lane client modular. October 1997 1345 */ 1346 1347 #include <linux/types.h> 1348 #include <linux/timer.h> 1349 #include <linux/param.h> 1350 #include <asm/atomic.h> 1351 #include <linux/inetdevice.h> 1352 #include <net/route.h> 1353 1354 #if 0 1355 #define pr_debug(format, args...) 1356 /* 1357 #define pr_debug printk 1358 */ 1359 #endif 1360 #define DEBUG_ARP_TABLE 0 1361 1362 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1363 1364 static void lec_arp_check_expire(struct work_struct *work); 1365 static void lec_arp_expire_arp(unsigned long data); 1366 1367 /* 1368 * Arp table funcs 1369 */ 1370 1371 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1372 1373 /* 1374 * Initialization of arp-cache 1375 */ 1376 static void lec_arp_init(struct lec_priv *priv) 1377 { 1378 unsigned short i; 1379 1380 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1381 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1382 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1383 INIT_HLIST_HEAD(&priv->lec_no_forward); 1384 INIT_HLIST_HEAD(&priv->mcast_fwds); 1385 spin_lock_init(&priv->lec_arp_lock); 1386 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1387 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1388 } 1389 1390 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1391 { 1392 if (entry->vcc) { 1393 struct atm_vcc *vcc = entry->vcc; 1394 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1395 struct net_device *dev = (struct net_device *)vcc->proto_data; 1396 1397 vcc->pop = vpriv->old_pop; 1398 if (vpriv->xoff) 1399 netif_wake_queue(dev); 1400 kfree(vpriv); 1401 vcc->user_back = NULL; 1402 vcc->push = entry->old_push; 1403 vcc_release_async(vcc, -EPIPE); 1404 entry->vcc = NULL; 1405 } 1406 if (entry->recv_vcc) { 1407 entry->recv_vcc->push = entry->old_recv_push; 1408 vcc_release_async(entry->recv_vcc, -EPIPE); 1409 entry->recv_vcc = NULL; 1410 } 1411 } 1412 1413 /* 1414 * Insert entry to lec_arp_table 1415 * LANE2: Add to the end of the list to satisfy 8.1.13 1416 */ 1417 static inline void 1418 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1419 { 1420 struct hlist_head *tmp; 1421 1422 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1423 hlist_add_head(&entry->next, tmp); 1424 1425 pr_debug("Added entry:%pM\n", entry->mac_addr); 1426 } 1427 1428 /* 1429 * Remove entry from lec_arp_table 1430 */ 1431 static int 1432 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1433 { 1434 struct hlist_node *node; 1435 struct lec_arp_table *entry; 1436 int i, remove_vcc = 1; 1437 1438 if (!to_remove) 1439 return -1; 1440 1441 hlist_del(&to_remove->next); 1442 del_timer(&to_remove->timer); 1443 1444 /* 1445 * If this is the only MAC connected to this VCC, 1446 * also tear down the VCC 1447 */ 1448 if (to_remove->status >= ESI_FLUSH_PENDING) { 1449 /* 1450 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1451 */ 1452 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1453 hlist_for_each_entry(entry, node, 1454 &priv->lec_arp_tables[i], next) { 1455 if (memcmp(to_remove->atm_addr, 1456 entry->atm_addr, ATM_ESA_LEN) == 0) { 1457 remove_vcc = 0; 1458 break; 1459 } 1460 } 1461 } 1462 if (remove_vcc) 1463 lec_arp_clear_vccs(to_remove); 1464 } 1465 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1466 1467 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1468 return 0; 1469 } 1470 1471 #if DEBUG_ARP_TABLE 1472 static const char *get_status_string(unsigned char st) 1473 { 1474 switch (st) { 1475 case ESI_UNKNOWN: 1476 return "ESI_UNKNOWN"; 1477 case ESI_ARP_PENDING: 1478 return "ESI_ARP_PENDING"; 1479 case ESI_VC_PENDING: 1480 return "ESI_VC_PENDING"; 1481 case ESI_FLUSH_PENDING: 1482 return "ESI_FLUSH_PENDING"; 1483 case ESI_FORWARD_DIRECT: 1484 return "ESI_FORWARD_DIRECT"; 1485 } 1486 return "<UNKNOWN>"; 1487 } 1488 1489 static void dump_arp_table(struct lec_priv *priv) 1490 { 1491 struct hlist_node *node; 1492 struct lec_arp_table *rulla; 1493 char buf[256]; 1494 int i, j, offset; 1495 1496 pr_info("Dump %p:\n", priv); 1497 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1498 hlist_for_each_entry(rulla, node, 1499 &priv->lec_arp_tables[i], next) { 1500 offset = 0; 1501 offset += sprintf(buf, "%d: %p\n", i, rulla); 1502 offset += sprintf(buf + offset, "Mac: %pM", 1503 rulla->mac_addr); 1504 offset += sprintf(buf + offset, " Atm:"); 1505 for (j = 0; j < ATM_ESA_LEN; j++) { 1506 offset += sprintf(buf + offset, 1507 "%2.2x ", 1508 rulla->atm_addr[j] & 0xff); 1509 } 1510 offset += sprintf(buf + offset, 1511 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1512 rulla->vcc ? rulla->vcc->vpi : 0, 1513 rulla->vcc ? rulla->vcc->vci : 0, 1514 rulla->recv_vcc ? rulla->recv_vcc-> 1515 vpi : 0, 1516 rulla->recv_vcc ? rulla->recv_vcc-> 1517 vci : 0, rulla->last_used, 1518 rulla->timestamp, rulla->no_tries); 1519 offset += 1520 sprintf(buf + offset, 1521 "Flags:%x, Packets_flooded:%x, Status: %s ", 1522 rulla->flags, rulla->packets_flooded, 1523 get_status_string(rulla->status)); 1524 pr_info("%s\n", buf); 1525 } 1526 } 1527 1528 if (!hlist_empty(&priv->lec_no_forward)) 1529 pr_info("No forward\n"); 1530 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) { 1531 offset = 0; 1532 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1533 offset += sprintf(buf + offset, " Atm:"); 1534 for (j = 0; j < ATM_ESA_LEN; j++) { 1535 offset += sprintf(buf + offset, "%2.2x ", 1536 rulla->atm_addr[j] & 0xff); 1537 } 1538 offset += sprintf(buf + offset, 1539 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1540 rulla->vcc ? rulla->vcc->vpi : 0, 1541 rulla->vcc ? rulla->vcc->vci : 0, 1542 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1543 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1544 rulla->last_used, 1545 rulla->timestamp, rulla->no_tries); 1546 offset += sprintf(buf + offset, 1547 "Flags:%x, Packets_flooded:%x, Status: %s ", 1548 rulla->flags, rulla->packets_flooded, 1549 get_status_string(rulla->status)); 1550 pr_info("%s\n", buf); 1551 } 1552 1553 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1554 pr_info("Empty ones\n"); 1555 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) { 1556 offset = 0; 1557 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1558 offset += sprintf(buf + offset, " Atm:"); 1559 for (j = 0; j < ATM_ESA_LEN; j++) { 1560 offset += sprintf(buf + offset, "%2.2x ", 1561 rulla->atm_addr[j] & 0xff); 1562 } 1563 offset += sprintf(buf + offset, 1564 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1565 rulla->vcc ? rulla->vcc->vpi : 0, 1566 rulla->vcc ? rulla->vcc->vci : 0, 1567 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1568 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1569 rulla->last_used, 1570 rulla->timestamp, rulla->no_tries); 1571 offset += sprintf(buf + offset, 1572 "Flags:%x, Packets_flooded:%x, Status: %s ", 1573 rulla->flags, rulla->packets_flooded, 1574 get_status_string(rulla->status)); 1575 pr_info("%s", buf); 1576 } 1577 1578 if (!hlist_empty(&priv->mcast_fwds)) 1579 pr_info("Multicast Forward VCCs\n"); 1580 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) { 1581 offset = 0; 1582 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1583 offset += sprintf(buf + offset, " Atm:"); 1584 for (j = 0; j < ATM_ESA_LEN; j++) { 1585 offset += sprintf(buf + offset, "%2.2x ", 1586 rulla->atm_addr[j] & 0xff); 1587 } 1588 offset += sprintf(buf + offset, 1589 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1590 rulla->vcc ? rulla->vcc->vpi : 0, 1591 rulla->vcc ? rulla->vcc->vci : 0, 1592 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1593 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1594 rulla->last_used, 1595 rulla->timestamp, rulla->no_tries); 1596 offset += sprintf(buf + offset, 1597 "Flags:%x, Packets_flooded:%x, Status: %s ", 1598 rulla->flags, rulla->packets_flooded, 1599 get_status_string(rulla->status)); 1600 pr_info("%s\n", buf); 1601 } 1602 1603 } 1604 #else 1605 #define dump_arp_table(priv) do { } while (0) 1606 #endif 1607 1608 /* 1609 * Destruction of arp-cache 1610 */ 1611 static void lec_arp_destroy(struct lec_priv *priv) 1612 { 1613 unsigned long flags; 1614 struct hlist_node *node, *next; 1615 struct lec_arp_table *entry; 1616 int i; 1617 1618 cancel_rearming_delayed_work(&priv->lec_arp_work); 1619 1620 /* 1621 * Remove all entries 1622 */ 1623 1624 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1625 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1626 hlist_for_each_entry_safe(entry, node, next, 1627 &priv->lec_arp_tables[i], next) { 1628 lec_arp_remove(priv, entry); 1629 lec_arp_put(entry); 1630 } 1631 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1632 } 1633 1634 hlist_for_each_entry_safe(entry, node, next, 1635 &priv->lec_arp_empty_ones, next) { 1636 del_timer_sync(&entry->timer); 1637 lec_arp_clear_vccs(entry); 1638 hlist_del(&entry->next); 1639 lec_arp_put(entry); 1640 } 1641 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1642 1643 hlist_for_each_entry_safe(entry, node, next, 1644 &priv->lec_no_forward, next) { 1645 del_timer_sync(&entry->timer); 1646 lec_arp_clear_vccs(entry); 1647 hlist_del(&entry->next); 1648 lec_arp_put(entry); 1649 } 1650 INIT_HLIST_HEAD(&priv->lec_no_forward); 1651 1652 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 1653 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1654 lec_arp_clear_vccs(entry); 1655 hlist_del(&entry->next); 1656 lec_arp_put(entry); 1657 } 1658 INIT_HLIST_HEAD(&priv->mcast_fwds); 1659 priv->mcast_vcc = NULL; 1660 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1661 } 1662 1663 /* 1664 * Find entry by mac_address 1665 */ 1666 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1667 const unsigned char *mac_addr) 1668 { 1669 struct hlist_node *node; 1670 struct hlist_head *head; 1671 struct lec_arp_table *entry; 1672 1673 pr_debug("%pM\n", mac_addr); 1674 1675 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1676 hlist_for_each_entry(entry, node, head, next) { 1677 if (!compare_ether_addr(mac_addr, entry->mac_addr)) 1678 return entry; 1679 } 1680 return NULL; 1681 } 1682 1683 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1684 const unsigned char *mac_addr) 1685 { 1686 struct lec_arp_table *to_return; 1687 1688 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1689 if (!to_return) { 1690 pr_info("LEC: Arp entry kmalloc failed\n"); 1691 return NULL; 1692 } 1693 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN); 1694 INIT_HLIST_NODE(&to_return->next); 1695 setup_timer(&to_return->timer, lec_arp_expire_arp, 1696 (unsigned long)to_return); 1697 to_return->last_used = jiffies; 1698 to_return->priv = priv; 1699 skb_queue_head_init(&to_return->tx_wait); 1700 atomic_set(&to_return->usage, 1); 1701 return to_return; 1702 } 1703 1704 /* Arp sent timer expired */ 1705 static void lec_arp_expire_arp(unsigned long data) 1706 { 1707 struct lec_arp_table *entry; 1708 1709 entry = (struct lec_arp_table *)data; 1710 1711 pr_debug("\n"); 1712 if (entry->status == ESI_ARP_PENDING) { 1713 if (entry->no_tries <= entry->priv->max_retry_count) { 1714 if (entry->is_rdesc) 1715 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1716 entry->mac_addr, NULL, NULL); 1717 else 1718 send_to_lecd(entry->priv, l_arp_xmt, 1719 entry->mac_addr, NULL, NULL); 1720 entry->no_tries++; 1721 } 1722 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1723 } 1724 } 1725 1726 /* Unknown/unused vcc expire, remove associated entry */ 1727 static void lec_arp_expire_vcc(unsigned long data) 1728 { 1729 unsigned long flags; 1730 struct lec_arp_table *to_remove = (struct lec_arp_table *)data; 1731 struct lec_priv *priv = (struct lec_priv *)to_remove->priv; 1732 1733 del_timer(&to_remove->timer); 1734 1735 pr_debug("%p %p: vpi:%d vci:%d\n", 1736 to_remove, priv, 1737 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1738 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1739 1740 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1741 hlist_del(&to_remove->next); 1742 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1743 1744 lec_arp_clear_vccs(to_remove); 1745 lec_arp_put(to_remove); 1746 } 1747 1748 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1749 unsigned long now, 1750 struct lec_priv *priv) 1751 { 1752 unsigned long time_to_check; 1753 1754 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1755 time_to_check = priv->forward_delay_time; 1756 else 1757 time_to_check = priv->aging_time; 1758 1759 pr_debug("About to expire: %lx - %lx > %lx\n", 1760 now, entry->last_used, time_to_check); 1761 if (time_after(now, entry->last_used + time_to_check) && 1762 !(entry->flags & LEC_PERMANENT_FLAG) && 1763 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1764 /* Remove entry */ 1765 pr_debug("Entry timed out\n"); 1766 lec_arp_remove(priv, entry); 1767 lec_arp_put(entry); 1768 } else { 1769 /* Something else */ 1770 if ((entry->status == ESI_VC_PENDING || 1771 entry->status == ESI_ARP_PENDING) && 1772 time_after_eq(now, entry->timestamp + 1773 priv->max_unknown_frame_time)) { 1774 entry->timestamp = jiffies; 1775 entry->packets_flooded = 0; 1776 if (entry->status == ESI_VC_PENDING) 1777 send_to_lecd(priv, l_svc_setup, 1778 entry->mac_addr, 1779 entry->atm_addr, 1780 NULL); 1781 } 1782 if (entry->status == ESI_FLUSH_PENDING && 1783 time_after_eq(now, entry->timestamp + 1784 priv->path_switching_delay)) { 1785 lec_arp_hold(entry); 1786 return true; 1787 } 1788 } 1789 1790 return false; 1791 } 1792 /* 1793 * Expire entries. 1794 * 1. Re-set timer 1795 * 2. For each entry, delete entries that have aged past the age limit. 1796 * 3. For each entry, depending on the status of the entry, perform 1797 * the following maintenance. 1798 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1799 * tick_count is above the max_unknown_frame_time, clear 1800 * the tick_count to zero and clear the packets_flooded counter 1801 * to zero. This supports the packet rate limit per address 1802 * while flooding unknowns. 1803 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1804 * than or equal to the path_switching_delay, change the status 1805 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1806 * regardless of the progress of the flush protocol. 1807 */ 1808 static void lec_arp_check_expire(struct work_struct *work) 1809 { 1810 unsigned long flags; 1811 struct lec_priv *priv = 1812 container_of(work, struct lec_priv, lec_arp_work.work); 1813 struct hlist_node *node, *next; 1814 struct lec_arp_table *entry; 1815 unsigned long now; 1816 int i; 1817 1818 pr_debug("%p\n", priv); 1819 now = jiffies; 1820 restart: 1821 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1822 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1823 hlist_for_each_entry_safe(entry, node, next, 1824 &priv->lec_arp_tables[i], next) { 1825 if (__lec_arp_check_expire(entry, now, priv)) { 1826 struct sk_buff *skb; 1827 struct atm_vcc *vcc = entry->vcc; 1828 1829 spin_unlock_irqrestore(&priv->lec_arp_lock, 1830 flags); 1831 while ((skb = skb_dequeue(&entry->tx_wait))) 1832 lec_send(vcc, skb); 1833 entry->last_used = jiffies; 1834 entry->status = ESI_FORWARD_DIRECT; 1835 lec_arp_put(entry); 1836 1837 goto restart; 1838 } 1839 } 1840 } 1841 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1842 1843 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1844 } 1845 1846 /* 1847 * Try to find vcc where mac_address is attached. 1848 * 1849 */ 1850 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1851 const unsigned char *mac_to_find, 1852 int is_rdesc, 1853 struct lec_arp_table **ret_entry) 1854 { 1855 unsigned long flags; 1856 struct lec_arp_table *entry; 1857 struct atm_vcc *found; 1858 1859 if (mac_to_find[0] & 0x01) { 1860 switch (priv->lane_version) { 1861 case 1: 1862 return priv->mcast_vcc; 1863 case 2: /* LANE2 wants arp for multicast addresses */ 1864 if (!compare_ether_addr(mac_to_find, bus_mac)) 1865 return priv->mcast_vcc; 1866 break; 1867 default: 1868 break; 1869 } 1870 } 1871 1872 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1873 entry = lec_arp_find(priv, mac_to_find); 1874 1875 if (entry) { 1876 if (entry->status == ESI_FORWARD_DIRECT) { 1877 /* Connection Ok */ 1878 entry->last_used = jiffies; 1879 lec_arp_hold(entry); 1880 *ret_entry = entry; 1881 found = entry->vcc; 1882 goto out; 1883 } 1884 /* 1885 * If the LE_ARP cache entry is still pending, reset count to 0 1886 * so another LE_ARP request can be made for this frame. 1887 */ 1888 if (entry->status == ESI_ARP_PENDING) 1889 entry->no_tries = 0; 1890 /* 1891 * Data direct VC not yet set up, check to see if the unknown 1892 * frame count is greater than the limit. If the limit has 1893 * not been reached, allow the caller to send packet to 1894 * BUS. 1895 */ 1896 if (entry->status != ESI_FLUSH_PENDING && 1897 entry->packets_flooded < 1898 priv->maximum_unknown_frame_count) { 1899 entry->packets_flooded++; 1900 pr_debug("Flooding..\n"); 1901 found = priv->mcast_vcc; 1902 goto out; 1903 } 1904 /* 1905 * We got here because entry->status == ESI_FLUSH_PENDING 1906 * or BUS flood limit was reached for an entry which is 1907 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1908 */ 1909 lec_arp_hold(entry); 1910 *ret_entry = entry; 1911 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1912 entry->vcc); 1913 found = NULL; 1914 } else { 1915 /* No matching entry was found */ 1916 entry = make_entry(priv, mac_to_find); 1917 pr_debug("Making entry\n"); 1918 if (!entry) { 1919 found = priv->mcast_vcc; 1920 goto out; 1921 } 1922 lec_arp_add(priv, entry); 1923 /* We want arp-request(s) to be sent */ 1924 entry->packets_flooded = 1; 1925 entry->status = ESI_ARP_PENDING; 1926 entry->no_tries = 1; 1927 entry->last_used = entry->timestamp = jiffies; 1928 entry->is_rdesc = is_rdesc; 1929 if (entry->is_rdesc) 1930 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1931 NULL); 1932 else 1933 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1934 entry->timer.expires = jiffies + (1 * HZ); 1935 entry->timer.function = lec_arp_expire_arp; 1936 add_timer(&entry->timer); 1937 found = priv->mcast_vcc; 1938 } 1939 1940 out: 1941 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1942 return found; 1943 } 1944 1945 static int 1946 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1947 unsigned long permanent) 1948 { 1949 unsigned long flags; 1950 struct hlist_node *node, *next; 1951 struct lec_arp_table *entry; 1952 int i; 1953 1954 pr_debug("\n"); 1955 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1956 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1957 hlist_for_each_entry_safe(entry, node, next, 1958 &priv->lec_arp_tables[i], next) { 1959 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1960 (permanent || 1961 !(entry->flags & LEC_PERMANENT_FLAG))) { 1962 lec_arp_remove(priv, entry); 1963 lec_arp_put(entry); 1964 } 1965 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1966 return 0; 1967 } 1968 } 1969 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1970 return -1; 1971 } 1972 1973 /* 1974 * Notifies: Response to arp_request (atm_addr != NULL) 1975 */ 1976 static void 1977 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1978 const unsigned char *atm_addr, unsigned long remoteflag, 1979 unsigned int targetless_le_arp) 1980 { 1981 unsigned long flags; 1982 struct hlist_node *node, *next; 1983 struct lec_arp_table *entry, *tmp; 1984 int i; 1985 1986 pr_debug("%smac:%pM\n", 1987 (targetless_le_arp) ? "targetless " : "", mac_addr); 1988 1989 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1990 entry = lec_arp_find(priv, mac_addr); 1991 if (entry == NULL && targetless_le_arp) 1992 goto out; /* 1993 * LANE2: ignore targetless LE_ARPs for which 1994 * we have no entry in the cache. 7.1.30 1995 */ 1996 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1997 hlist_for_each_entry_safe(entry, node, next, 1998 &priv->lec_arp_empty_ones, next) { 1999 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 2000 hlist_del(&entry->next); 2001 del_timer(&entry->timer); 2002 tmp = lec_arp_find(priv, mac_addr); 2003 if (tmp) { 2004 del_timer(&tmp->timer); 2005 tmp->status = ESI_FORWARD_DIRECT; 2006 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 2007 tmp->vcc = entry->vcc; 2008 tmp->old_push = entry->old_push; 2009 tmp->last_used = jiffies; 2010 del_timer(&entry->timer); 2011 lec_arp_put(entry); 2012 entry = tmp; 2013 } else { 2014 entry->status = ESI_FORWARD_DIRECT; 2015 memcpy(entry->mac_addr, mac_addr, ETH_ALEN); 2016 entry->last_used = jiffies; 2017 lec_arp_add(priv, entry); 2018 } 2019 if (remoteflag) 2020 entry->flags |= LEC_REMOTE_FLAG; 2021 else 2022 entry->flags &= ~LEC_REMOTE_FLAG; 2023 pr_debug("After update\n"); 2024 dump_arp_table(priv); 2025 goto out; 2026 } 2027 } 2028 } 2029 2030 entry = lec_arp_find(priv, mac_addr); 2031 if (!entry) { 2032 entry = make_entry(priv, mac_addr); 2033 if (!entry) 2034 goto out; 2035 entry->status = ESI_UNKNOWN; 2036 lec_arp_add(priv, entry); 2037 /* Temporary, changes before end of function */ 2038 } 2039 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 2040 del_timer(&entry->timer); 2041 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2042 hlist_for_each_entry(tmp, node, 2043 &priv->lec_arp_tables[i], next) { 2044 if (entry != tmp && 2045 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 2046 /* Vcc to this host exists */ 2047 if (tmp->status > ESI_VC_PENDING) { 2048 /* 2049 * ESI_FLUSH_PENDING, 2050 * ESI_FORWARD_DIRECT 2051 */ 2052 entry->vcc = tmp->vcc; 2053 entry->old_push = tmp->old_push; 2054 } 2055 entry->status = tmp->status; 2056 break; 2057 } 2058 } 2059 } 2060 if (remoteflag) 2061 entry->flags |= LEC_REMOTE_FLAG; 2062 else 2063 entry->flags &= ~LEC_REMOTE_FLAG; 2064 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 2065 entry->status = ESI_VC_PENDING; 2066 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 2067 } 2068 pr_debug("After update2\n"); 2069 dump_arp_table(priv); 2070 out: 2071 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2072 } 2073 2074 /* 2075 * Notifies: Vcc setup ready 2076 */ 2077 static void 2078 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 2079 struct atm_vcc *vcc, 2080 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 2081 { 2082 unsigned long flags; 2083 struct hlist_node *node; 2084 struct lec_arp_table *entry; 2085 int i, found_entry = 0; 2086 2087 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2088 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2089 if (ioc_data->receive == 2) { 2090 pr_debug("LEC_ARP: Attaching mcast forward\n"); 2091 #if 0 2092 entry = lec_arp_find(priv, bus_mac); 2093 if (!entry) { 2094 pr_info("LEC_ARP: Multicast entry not found!\n"); 2095 goto out; 2096 } 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 #endif 2101 entry = make_entry(priv, bus_mac); 2102 if (entry == NULL) 2103 goto out; 2104 del_timer(&entry->timer); 2105 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2106 entry->recv_vcc = vcc; 2107 entry->old_recv_push = old_push; 2108 hlist_add_head(&entry->next, &priv->mcast_fwds); 2109 goto out; 2110 } else if (ioc_data->receive == 1) { 2111 /* 2112 * Vcc which we don't want to make default vcc, 2113 * attach it anyway. 2114 */ 2115 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", 2116 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2117 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2118 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2119 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2120 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2121 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2122 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2123 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2124 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2125 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2126 entry = make_entry(priv, bus_mac); 2127 if (entry == NULL) 2128 goto out; 2129 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2130 memset(entry->mac_addr, 0, ETH_ALEN); 2131 entry->recv_vcc = vcc; 2132 entry->old_recv_push = old_push; 2133 entry->status = ESI_UNKNOWN; 2134 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2135 entry->timer.function = lec_arp_expire_vcc; 2136 hlist_add_head(&entry->next, &priv->lec_no_forward); 2137 add_timer(&entry->timer); 2138 dump_arp_table(priv); 2139 goto out; 2140 } 2141 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", 2142 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2143 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2144 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2145 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2146 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2147 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2148 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2149 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2150 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2151 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2152 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2153 hlist_for_each_entry(entry, node, 2154 &priv->lec_arp_tables[i], next) { 2155 if (memcmp 2156 (ioc_data->atm_addr, entry->atm_addr, 2157 ATM_ESA_LEN) == 0) { 2158 pr_debug("LEC_ARP: Attaching data direct\n"); 2159 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 2160 entry->vcc ? entry->vcc->vci : 0, 2161 entry->recv_vcc ? entry->recv_vcc-> 2162 vci : 0); 2163 found_entry = 1; 2164 del_timer(&entry->timer); 2165 entry->vcc = vcc; 2166 entry->old_push = old_push; 2167 if (entry->status == ESI_VC_PENDING) { 2168 if (priv->maximum_unknown_frame_count 2169 == 0) 2170 entry->status = 2171 ESI_FORWARD_DIRECT; 2172 else { 2173 entry->timestamp = jiffies; 2174 entry->status = 2175 ESI_FLUSH_PENDING; 2176 #if 0 2177 send_to_lecd(priv, l_flush_xmt, 2178 NULL, 2179 entry->atm_addr, 2180 NULL); 2181 #endif 2182 } 2183 } else { 2184 /* 2185 * They were forming a connection 2186 * to us, and we to them. Our 2187 * ATM address is numerically lower 2188 * than theirs, so we make connection 2189 * we formed into default VCC (8.1.11). 2190 * Connection they made gets torn 2191 * down. This might confuse some 2192 * clients. Can be changed if 2193 * someone reports trouble... 2194 */ 2195 ; 2196 } 2197 } 2198 } 2199 } 2200 if (found_entry) { 2201 pr_debug("After vcc was added\n"); 2202 dump_arp_table(priv); 2203 goto out; 2204 } 2205 /* 2206 * Not found, snatch address from first data packet that arrives 2207 * from this vcc 2208 */ 2209 entry = make_entry(priv, bus_mac); 2210 if (!entry) 2211 goto out; 2212 entry->vcc = vcc; 2213 entry->old_push = old_push; 2214 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2215 memset(entry->mac_addr, 0, ETH_ALEN); 2216 entry->status = ESI_UNKNOWN; 2217 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2218 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2219 entry->timer.function = lec_arp_expire_vcc; 2220 add_timer(&entry->timer); 2221 pr_debug("After vcc was added\n"); 2222 dump_arp_table(priv); 2223 out: 2224 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2225 } 2226 2227 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2228 { 2229 unsigned long flags; 2230 struct hlist_node *node; 2231 struct lec_arp_table *entry; 2232 int i; 2233 2234 pr_debug("%lx\n", tran_id); 2235 restart: 2236 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2237 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2238 hlist_for_each_entry(entry, node, 2239 &priv->lec_arp_tables[i], next) { 2240 if (entry->flush_tran_id == tran_id && 2241 entry->status == ESI_FLUSH_PENDING) { 2242 struct sk_buff *skb; 2243 struct atm_vcc *vcc = entry->vcc; 2244 2245 lec_arp_hold(entry); 2246 spin_unlock_irqrestore(&priv->lec_arp_lock, 2247 flags); 2248 while ((skb = skb_dequeue(&entry->tx_wait))) 2249 lec_send(vcc, skb); 2250 entry->last_used = jiffies; 2251 entry->status = ESI_FORWARD_DIRECT; 2252 lec_arp_put(entry); 2253 pr_debug("LEC_ARP: Flushed\n"); 2254 goto restart; 2255 } 2256 } 2257 } 2258 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2259 dump_arp_table(priv); 2260 } 2261 2262 static void 2263 lec_set_flush_tran_id(struct lec_priv *priv, 2264 const unsigned char *atm_addr, unsigned long tran_id) 2265 { 2266 unsigned long flags; 2267 struct hlist_node *node; 2268 struct lec_arp_table *entry; 2269 int i; 2270 2271 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2272 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2273 hlist_for_each_entry(entry, node, 2274 &priv->lec_arp_tables[i], next) { 2275 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2276 entry->flush_tran_id = tran_id; 2277 pr_debug("Set flush transaction id to %lx for %p\n", 2278 tran_id, entry); 2279 } 2280 } 2281 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2282 } 2283 2284 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2285 { 2286 unsigned long flags; 2287 unsigned char mac_addr[] = { 2288 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2289 }; 2290 struct lec_arp_table *to_add; 2291 struct lec_vcc_priv *vpriv; 2292 int err = 0; 2293 2294 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 2295 if (!vpriv) 2296 return -ENOMEM; 2297 vpriv->xoff = 0; 2298 vpriv->old_pop = vcc->pop; 2299 vcc->user_back = vpriv; 2300 vcc->pop = lec_pop; 2301 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2302 to_add = make_entry(priv, mac_addr); 2303 if (!to_add) { 2304 vcc->pop = vpriv->old_pop; 2305 kfree(vpriv); 2306 err = -ENOMEM; 2307 goto out; 2308 } 2309 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2310 to_add->status = ESI_FORWARD_DIRECT; 2311 to_add->flags |= LEC_PERMANENT_FLAG; 2312 to_add->vcc = vcc; 2313 to_add->old_push = vcc->push; 2314 vcc->push = lec_push; 2315 priv->mcast_vcc = vcc; 2316 lec_arp_add(priv, to_add); 2317 out: 2318 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2319 return err; 2320 } 2321 2322 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2323 { 2324 unsigned long flags; 2325 struct hlist_node *node, *next; 2326 struct lec_arp_table *entry; 2327 int i; 2328 2329 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2330 dump_arp_table(priv); 2331 2332 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2333 2334 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2335 hlist_for_each_entry_safe(entry, node, next, 2336 &priv->lec_arp_tables[i], next) { 2337 if (vcc == entry->vcc) { 2338 lec_arp_remove(priv, entry); 2339 lec_arp_put(entry); 2340 if (priv->mcast_vcc == vcc) 2341 priv->mcast_vcc = NULL; 2342 } 2343 } 2344 } 2345 2346 hlist_for_each_entry_safe(entry, node, next, 2347 &priv->lec_arp_empty_ones, next) { 2348 if (entry->vcc == vcc) { 2349 lec_arp_clear_vccs(entry); 2350 del_timer(&entry->timer); 2351 hlist_del(&entry->next); 2352 lec_arp_put(entry); 2353 } 2354 } 2355 2356 hlist_for_each_entry_safe(entry, node, next, 2357 &priv->lec_no_forward, next) { 2358 if (entry->recv_vcc == vcc) { 2359 lec_arp_clear_vccs(entry); 2360 del_timer(&entry->timer); 2361 hlist_del(&entry->next); 2362 lec_arp_put(entry); 2363 } 2364 } 2365 2366 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 2367 if (entry->recv_vcc == vcc) { 2368 lec_arp_clear_vccs(entry); 2369 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2370 hlist_del(&entry->next); 2371 lec_arp_put(entry); 2372 } 2373 } 2374 2375 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2376 dump_arp_table(priv); 2377 } 2378 2379 static void 2380 lec_arp_check_empties(struct lec_priv *priv, 2381 struct atm_vcc *vcc, struct sk_buff *skb) 2382 { 2383 unsigned long flags; 2384 struct hlist_node *node, *next; 2385 struct lec_arp_table *entry, *tmp; 2386 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2387 unsigned char *src; 2388 #ifdef CONFIG_TR 2389 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data; 2390 2391 if (priv->is_trdev) 2392 src = tr_hdr->h_source; 2393 else 2394 #endif 2395 src = hdr->h_source; 2396 2397 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2398 hlist_for_each_entry_safe(entry, node, next, 2399 &priv->lec_arp_empty_ones, next) { 2400 if (vcc == entry->vcc) { 2401 del_timer(&entry->timer); 2402 memcpy(entry->mac_addr, src, ETH_ALEN); 2403 entry->status = ESI_FORWARD_DIRECT; 2404 entry->last_used = jiffies; 2405 /* We might have got an entry */ 2406 tmp = lec_arp_find(priv, src); 2407 if (tmp) { 2408 lec_arp_remove(priv, tmp); 2409 lec_arp_put(tmp); 2410 } 2411 hlist_del(&entry->next); 2412 lec_arp_add(priv, entry); 2413 goto out; 2414 } 2415 } 2416 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2417 out: 2418 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2419 } 2420 2421 MODULE_LICENSE("GPL"); 2422