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((struct lec_priv *)netdev_priv(dev_lec[arg]), 820 vcc); 821 } 822 823 /* Initialize device. */ 824 static int lecd_attach(struct atm_vcc *vcc, int arg) 825 { 826 int i; 827 struct lec_priv *priv; 828 829 if (arg < 0) 830 i = 0; 831 else 832 i = arg; 833 #ifdef CONFIG_TR 834 if (arg >= MAX_LEC_ITF) 835 return -EINVAL; 836 #else /* Reserve the top NUM_TR_DEVS for TR */ 837 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS)) 838 return -EINVAL; 839 #endif 840 if (!dev_lec[i]) { 841 int is_trdev, size; 842 843 is_trdev = 0; 844 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS)) 845 is_trdev = 1; 846 847 size = sizeof(struct lec_priv); 848 #ifdef CONFIG_TR 849 if (is_trdev) 850 dev_lec[i] = alloc_trdev(size); 851 else 852 #endif 853 dev_lec[i] = alloc_etherdev(size); 854 if (!dev_lec[i]) 855 return -ENOMEM; 856 dev_lec[i]->netdev_ops = &lec_netdev_ops; 857 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 858 if (register_netdev(dev_lec[i])) { 859 free_netdev(dev_lec[i]); 860 return -EINVAL; 861 } 862 863 priv = netdev_priv(dev_lec[i]); 864 priv->is_trdev = is_trdev; 865 } else { 866 priv = netdev_priv(dev_lec[i]); 867 if (priv->lecd) 868 return -EADDRINUSE; 869 } 870 lec_arp_init(priv); 871 priv->itfnum = i; /* LANE2 addition */ 872 priv->lecd = vcc; 873 vcc->dev = &lecatm_dev; 874 vcc_insert_socket(sk_atm(vcc)); 875 876 vcc->proto_data = dev_lec[i]; 877 set_bit(ATM_VF_META, &vcc->flags); 878 set_bit(ATM_VF_READY, &vcc->flags); 879 880 /* Set default values to these variables */ 881 priv->maximum_unknown_frame_count = 1; 882 priv->max_unknown_frame_time = (1 * HZ); 883 priv->vcc_timeout_period = (1200 * HZ); 884 priv->max_retry_count = 1; 885 priv->aging_time = (300 * HZ); 886 priv->forward_delay_time = (15 * HZ); 887 priv->topology_change = 0; 888 priv->arp_response_time = (1 * HZ); 889 priv->flush_timeout = (4 * HZ); 890 priv->path_switching_delay = (6 * HZ); 891 892 if (dev_lec[i]->flags & IFF_UP) 893 netif_start_queue(dev_lec[i]); 894 __module_get(THIS_MODULE); 895 return i; 896 } 897 898 #ifdef CONFIG_PROC_FS 899 static const char *lec_arp_get_status_string(unsigned char status) 900 { 901 static const char *const lec_arp_status_string[] = { 902 "ESI_UNKNOWN ", 903 "ESI_ARP_PENDING ", 904 "ESI_VC_PENDING ", 905 "<Undefined> ", 906 "ESI_FLUSH_PENDING ", 907 "ESI_FORWARD_DIRECT" 908 }; 909 910 if (status > ESI_FORWARD_DIRECT) 911 status = 3; /* ESI_UNDEFINED */ 912 return lec_arp_status_string[status]; 913 } 914 915 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 916 { 917 int i; 918 919 for (i = 0; i < ETH_ALEN; i++) 920 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); 921 seq_printf(seq, " "); 922 for (i = 0; i < ATM_ESA_LEN; i++) 923 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); 924 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), 925 entry->flags & 0xffff); 926 if (entry->vcc) 927 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 928 else 929 seq_printf(seq, " "); 930 if (entry->recv_vcc) { 931 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 932 entry->recv_vcc->vci); 933 } 934 seq_putc(seq, '\n'); 935 } 936 937 struct lec_state { 938 unsigned long flags; 939 struct lec_priv *locked; 940 struct hlist_node *node; 941 struct net_device *dev; 942 int itf; 943 int arp_table; 944 int misc_table; 945 }; 946 947 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 948 loff_t *l) 949 { 950 struct hlist_node *e = state->node; 951 struct lec_arp_table *tmp; 952 953 if (!e) 954 e = tbl->first; 955 if (e == SEQ_START_TOKEN) { 956 e = tbl->first; 957 --*l; 958 } 959 960 hlist_for_each_entry_from(tmp, e, next) { 961 if (--*l < 0) 962 break; 963 } 964 state->node = e; 965 966 return (*l < 0) ? state : NULL; 967 } 968 969 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 970 struct lec_priv *priv) 971 { 972 void *v = NULL; 973 int p; 974 975 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 976 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 977 if (v) 978 break; 979 } 980 state->arp_table = p; 981 return v; 982 } 983 984 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 985 struct lec_priv *priv) 986 { 987 struct hlist_head *lec_misc_tables[] = { 988 &priv->lec_arp_empty_ones, 989 &priv->lec_no_forward, 990 &priv->mcast_fwds 991 }; 992 void *v = NULL; 993 int q; 994 995 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 996 v = lec_tbl_walk(state, lec_misc_tables[q], l); 997 if (v) 998 break; 999 } 1000 state->misc_table = q; 1001 return v; 1002 } 1003 1004 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 1005 struct lec_priv *priv) 1006 { 1007 if (!state->locked) { 1008 state->locked = priv; 1009 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 1010 } 1011 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 1012 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 1013 state->locked = NULL; 1014 /* Partial state reset for the next time we get called */ 1015 state->arp_table = state->misc_table = 0; 1016 } 1017 return state->locked; 1018 } 1019 1020 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 1021 { 1022 struct net_device *dev; 1023 void *v; 1024 1025 dev = state->dev ? state->dev : dev_lec[state->itf]; 1026 v = (dev && netdev_priv(dev)) ? 1027 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 1028 if (!v && dev) { 1029 dev_put(dev); 1030 /* Partial state reset for the next time we get called */ 1031 dev = NULL; 1032 } 1033 state->dev = dev; 1034 return v; 1035 } 1036 1037 static void *lec_get_idx(struct lec_state *state, loff_t l) 1038 { 1039 void *v = NULL; 1040 1041 for (; state->itf < MAX_LEC_ITF; state->itf++) { 1042 v = lec_itf_walk(state, &l); 1043 if (v) 1044 break; 1045 } 1046 return v; 1047 } 1048 1049 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 1050 { 1051 struct lec_state *state = seq->private; 1052 1053 state->itf = 0; 1054 state->dev = NULL; 1055 state->locked = NULL; 1056 state->arp_table = 0; 1057 state->misc_table = 0; 1058 state->node = SEQ_START_TOKEN; 1059 1060 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 1061 } 1062 1063 static void lec_seq_stop(struct seq_file *seq, void *v) 1064 { 1065 struct lec_state *state = seq->private; 1066 1067 if (state->dev) { 1068 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 1069 state->flags); 1070 dev_put(state->dev); 1071 } 1072 } 1073 1074 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1075 { 1076 struct lec_state *state = seq->private; 1077 1078 v = lec_get_idx(state, 1); 1079 *pos += !!PTR_ERR(v); 1080 return v; 1081 } 1082 1083 static int lec_seq_show(struct seq_file *seq, void *v) 1084 { 1085 static const char lec_banner[] = 1086 "Itf MAC ATM destination" 1087 " Status Flags " 1088 "VPI/VCI Recv VPI/VCI\n"; 1089 1090 if (v == SEQ_START_TOKEN) 1091 seq_puts(seq, lec_banner); 1092 else { 1093 struct lec_state *state = seq->private; 1094 struct net_device *dev = state->dev; 1095 struct lec_arp_table *entry = hlist_entry(state->node, 1096 struct lec_arp_table, 1097 next); 1098 1099 seq_printf(seq, "%s ", dev->name); 1100 lec_info(seq, entry); 1101 } 1102 return 0; 1103 } 1104 1105 static const struct seq_operations lec_seq_ops = { 1106 .start = lec_seq_start, 1107 .next = lec_seq_next, 1108 .stop = lec_seq_stop, 1109 .show = lec_seq_show, 1110 }; 1111 1112 static int lec_seq_open(struct inode *inode, struct file *file) 1113 { 1114 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state)); 1115 } 1116 1117 static const struct file_operations lec_seq_fops = { 1118 .owner = THIS_MODULE, 1119 .open = lec_seq_open, 1120 .read = seq_read, 1121 .llseek = seq_lseek, 1122 .release = seq_release_private, 1123 }; 1124 #endif 1125 1126 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1127 { 1128 struct atm_vcc *vcc = ATM_SD(sock); 1129 int err = 0; 1130 1131 switch (cmd) { 1132 case ATMLEC_CTRL: 1133 case ATMLEC_MCAST: 1134 case ATMLEC_DATA: 1135 if (!capable(CAP_NET_ADMIN)) 1136 return -EPERM; 1137 break; 1138 default: 1139 return -ENOIOCTLCMD; 1140 } 1141 1142 switch (cmd) { 1143 case ATMLEC_CTRL: 1144 err = lecd_attach(vcc, (int)arg); 1145 if (err >= 0) 1146 sock->state = SS_CONNECTED; 1147 break; 1148 case ATMLEC_MCAST: 1149 err = lec_mcast_attach(vcc, (int)arg); 1150 break; 1151 case ATMLEC_DATA: 1152 err = lec_vcc_attach(vcc, (void __user *)arg); 1153 break; 1154 } 1155 1156 return err; 1157 } 1158 1159 static struct atm_ioctl lane_ioctl_ops = { 1160 .owner = THIS_MODULE, 1161 .ioctl = lane_ioctl, 1162 }; 1163 1164 static int __init lane_module_init(void) 1165 { 1166 #ifdef CONFIG_PROC_FS 1167 struct proc_dir_entry *p; 1168 1169 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops); 1170 if (!p) { 1171 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1172 return -ENOMEM; 1173 } 1174 #endif 1175 1176 register_atm_ioctl(&lane_ioctl_ops); 1177 pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n"); 1178 return 0; 1179 } 1180 1181 static void __exit lane_module_cleanup(void) 1182 { 1183 int i; 1184 struct lec_priv *priv; 1185 1186 remove_proc_entry("lec", atm_proc_root); 1187 1188 deregister_atm_ioctl(&lane_ioctl_ops); 1189 1190 for (i = 0; i < MAX_LEC_ITF; i++) { 1191 if (dev_lec[i] != NULL) { 1192 priv = netdev_priv(dev_lec[i]); 1193 unregister_netdev(dev_lec[i]); 1194 free_netdev(dev_lec[i]); 1195 dev_lec[i] = NULL; 1196 } 1197 } 1198 } 1199 1200 module_init(lane_module_init); 1201 module_exit(lane_module_cleanup); 1202 1203 /* 1204 * LANE2: 3.1.3, LE_RESOLVE.request 1205 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1206 * If sizeoftlvs == NULL the default TLVs associated with with this 1207 * lec will be used. 1208 * If dst_mac == NULL, targetless LE_ARP will be sent 1209 */ 1210 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1211 u8 **tlvs, u32 *sizeoftlvs) 1212 { 1213 unsigned long flags; 1214 struct lec_priv *priv = netdev_priv(dev); 1215 struct lec_arp_table *table; 1216 struct sk_buff *skb; 1217 int retval; 1218 1219 if (force == 0) { 1220 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1221 table = lec_arp_find(priv, dst_mac); 1222 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1223 if (table == NULL) 1224 return -1; 1225 1226 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1227 if (*tlvs == NULL) 1228 return -1; 1229 1230 *sizeoftlvs = table->sizeoftlvs; 1231 1232 return 0; 1233 } 1234 1235 if (sizeoftlvs == NULL) 1236 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1237 1238 else { 1239 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1240 if (skb == NULL) 1241 return -1; 1242 skb->len = *sizeoftlvs; 1243 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1244 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1245 } 1246 return retval; 1247 } 1248 1249 /* 1250 * LANE2: 3.1.4, LE_ASSOCIATE.request 1251 * Associate the *tlvs with the *lan_dst address. 1252 * Will overwrite any previous association 1253 * Returns 1 for success, 0 for failure (out of memory) 1254 * 1255 */ 1256 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1257 const u8 *tlvs, u32 sizeoftlvs) 1258 { 1259 int retval; 1260 struct sk_buff *skb; 1261 struct lec_priv *priv = netdev_priv(dev); 1262 1263 if (compare_ether_addr(lan_dst, dev->dev_addr)) 1264 return 0; /* not our mac address */ 1265 1266 kfree(priv->tlvs); /* NULL if there was no previous association */ 1267 1268 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1269 if (priv->tlvs == NULL) 1270 return 0; 1271 priv->sizeoftlvs = sizeoftlvs; 1272 1273 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1274 if (skb == NULL) 1275 return 0; 1276 skb->len = sizeoftlvs; 1277 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1278 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1279 if (retval != 0) 1280 pr_info("lec.c: lane2_associate_req() failed\n"); 1281 /* 1282 * If the previous association has changed we must 1283 * somehow notify other LANE entities about the change 1284 */ 1285 return 1; 1286 } 1287 1288 /* 1289 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1290 * 1291 */ 1292 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1293 const u8 *tlvs, u32 sizeoftlvs) 1294 { 1295 #if 0 1296 int i = 0; 1297 #endif 1298 struct lec_priv *priv = netdev_priv(dev); 1299 #if 0 /* 1300 * Why have the TLVs in LE_ARP entries 1301 * since we do not use them? When you 1302 * uncomment this code, make sure the 1303 * TLVs get freed when entry is killed 1304 */ 1305 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1306 1307 if (entry == NULL) 1308 return; /* should not happen */ 1309 1310 kfree(entry->tlvs); 1311 1312 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1313 if (entry->tlvs == NULL) 1314 return; 1315 entry->sizeoftlvs = sizeoftlvs; 1316 #endif 1317 #if 0 1318 pr_info("\n"); 1319 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1320 while (i < sizeoftlvs) 1321 pr_cont("%02x ", tlvs[i++]); 1322 1323 pr_cont("\n"); 1324 #endif 1325 1326 /* tell MPOA about the TLVs we saw */ 1327 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1328 priv->lane2_ops->associate_indicator(dev, mac_addr, 1329 tlvs, sizeoftlvs); 1330 } 1331 } 1332 1333 /* 1334 * Here starts what used to lec_arpc.c 1335 * 1336 * lec_arpc.c was added here when making 1337 * lane client modular. October 1997 1338 */ 1339 1340 #include <linux/types.h> 1341 #include <linux/timer.h> 1342 #include <linux/param.h> 1343 #include <asm/atomic.h> 1344 #include <linux/inetdevice.h> 1345 #include <net/route.h> 1346 1347 #if 0 1348 #define pr_debug(format, args...) 1349 /* 1350 #define pr_debug printk 1351 */ 1352 #endif 1353 #define DEBUG_ARP_TABLE 0 1354 1355 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1356 1357 static void lec_arp_check_expire(struct work_struct *work); 1358 static void lec_arp_expire_arp(unsigned long data); 1359 1360 /* 1361 * Arp table funcs 1362 */ 1363 1364 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1365 1366 /* 1367 * Initialization of arp-cache 1368 */ 1369 static void lec_arp_init(struct lec_priv *priv) 1370 { 1371 unsigned short i; 1372 1373 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1374 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1375 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1376 INIT_HLIST_HEAD(&priv->lec_no_forward); 1377 INIT_HLIST_HEAD(&priv->mcast_fwds); 1378 spin_lock_init(&priv->lec_arp_lock); 1379 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1380 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1381 } 1382 1383 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1384 { 1385 if (entry->vcc) { 1386 struct atm_vcc *vcc = entry->vcc; 1387 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1388 struct net_device *dev = (struct net_device *)vcc->proto_data; 1389 1390 vcc->pop = vpriv->old_pop; 1391 if (vpriv->xoff) 1392 netif_wake_queue(dev); 1393 kfree(vpriv); 1394 vcc->user_back = NULL; 1395 vcc->push = entry->old_push; 1396 vcc_release_async(vcc, -EPIPE); 1397 entry->vcc = NULL; 1398 } 1399 if (entry->recv_vcc) { 1400 entry->recv_vcc->push = entry->old_recv_push; 1401 vcc_release_async(entry->recv_vcc, -EPIPE); 1402 entry->recv_vcc = NULL; 1403 } 1404 } 1405 1406 /* 1407 * Insert entry to lec_arp_table 1408 * LANE2: Add to the end of the list to satisfy 8.1.13 1409 */ 1410 static inline void 1411 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1412 { 1413 struct hlist_head *tmp; 1414 1415 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1416 hlist_add_head(&entry->next, tmp); 1417 1418 pr_debug("Added entry:%pM\n", entry->mac_addr); 1419 } 1420 1421 /* 1422 * Remove entry from lec_arp_table 1423 */ 1424 static int 1425 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1426 { 1427 struct hlist_node *node; 1428 struct lec_arp_table *entry; 1429 int i, remove_vcc = 1; 1430 1431 if (!to_remove) 1432 return -1; 1433 1434 hlist_del(&to_remove->next); 1435 del_timer(&to_remove->timer); 1436 1437 /* 1438 * If this is the only MAC connected to this VCC, 1439 * also tear down the VCC 1440 */ 1441 if (to_remove->status >= ESI_FLUSH_PENDING) { 1442 /* 1443 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1444 */ 1445 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1446 hlist_for_each_entry(entry, node, 1447 &priv->lec_arp_tables[i], next) { 1448 if (memcmp(to_remove->atm_addr, 1449 entry->atm_addr, ATM_ESA_LEN) == 0) { 1450 remove_vcc = 0; 1451 break; 1452 } 1453 } 1454 } 1455 if (remove_vcc) 1456 lec_arp_clear_vccs(to_remove); 1457 } 1458 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1459 1460 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1461 return 0; 1462 } 1463 1464 #if DEBUG_ARP_TABLE 1465 static const char *get_status_string(unsigned char st) 1466 { 1467 switch (st) { 1468 case ESI_UNKNOWN: 1469 return "ESI_UNKNOWN"; 1470 case ESI_ARP_PENDING: 1471 return "ESI_ARP_PENDING"; 1472 case ESI_VC_PENDING: 1473 return "ESI_VC_PENDING"; 1474 case ESI_FLUSH_PENDING: 1475 return "ESI_FLUSH_PENDING"; 1476 case ESI_FORWARD_DIRECT: 1477 return "ESI_FORWARD_DIRECT"; 1478 } 1479 return "<UNKNOWN>"; 1480 } 1481 1482 static void dump_arp_table(struct lec_priv *priv) 1483 { 1484 struct hlist_node *node; 1485 struct lec_arp_table *rulla; 1486 char buf[256]; 1487 int i, j, offset; 1488 1489 pr_info("Dump %p:\n", priv); 1490 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1491 hlist_for_each_entry(rulla, node, 1492 &priv->lec_arp_tables[i], next) { 1493 offset = 0; 1494 offset += sprintf(buf, "%d: %p\n", i, rulla); 1495 offset += sprintf(buf + offset, "Mac: %pM", 1496 rulla->mac_addr); 1497 offset += sprintf(buf + offset, " Atm:"); 1498 for (j = 0; j < ATM_ESA_LEN; j++) { 1499 offset += sprintf(buf + offset, 1500 "%2.2x ", 1501 rulla->atm_addr[j] & 0xff); 1502 } 1503 offset += sprintf(buf + offset, 1504 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1505 rulla->vcc ? rulla->vcc->vpi : 0, 1506 rulla->vcc ? rulla->vcc->vci : 0, 1507 rulla->recv_vcc ? rulla->recv_vcc-> 1508 vpi : 0, 1509 rulla->recv_vcc ? rulla->recv_vcc-> 1510 vci : 0, rulla->last_used, 1511 rulla->timestamp, rulla->no_tries); 1512 offset += 1513 sprintf(buf + offset, 1514 "Flags:%x, Packets_flooded:%x, Status: %s ", 1515 rulla->flags, rulla->packets_flooded, 1516 get_status_string(rulla->status)); 1517 pr_info("%s\n", buf); 1518 } 1519 } 1520 1521 if (!hlist_empty(&priv->lec_no_forward)) 1522 pr_info("No forward\n"); 1523 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) { 1524 offset = 0; 1525 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1526 offset += sprintf(buf + offset, " Atm:"); 1527 for (j = 0; j < ATM_ESA_LEN; j++) { 1528 offset += sprintf(buf + offset, "%2.2x ", 1529 rulla->atm_addr[j] & 0xff); 1530 } 1531 offset += sprintf(buf + offset, 1532 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1533 rulla->vcc ? rulla->vcc->vpi : 0, 1534 rulla->vcc ? rulla->vcc->vci : 0, 1535 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1536 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1537 rulla->last_used, 1538 rulla->timestamp, rulla->no_tries); 1539 offset += sprintf(buf + offset, 1540 "Flags:%x, Packets_flooded:%x, Status: %s ", 1541 rulla->flags, rulla->packets_flooded, 1542 get_status_string(rulla->status)); 1543 pr_info("%s\n", buf); 1544 } 1545 1546 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1547 pr_info("Empty ones\n"); 1548 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) { 1549 offset = 0; 1550 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1551 offset += sprintf(buf + offset, " Atm:"); 1552 for (j = 0; j < ATM_ESA_LEN; j++) { 1553 offset += sprintf(buf + offset, "%2.2x ", 1554 rulla->atm_addr[j] & 0xff); 1555 } 1556 offset += sprintf(buf + offset, 1557 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1558 rulla->vcc ? rulla->vcc->vpi : 0, 1559 rulla->vcc ? rulla->vcc->vci : 0, 1560 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1561 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1562 rulla->last_used, 1563 rulla->timestamp, rulla->no_tries); 1564 offset += sprintf(buf + offset, 1565 "Flags:%x, Packets_flooded:%x, Status: %s ", 1566 rulla->flags, rulla->packets_flooded, 1567 get_status_string(rulla->status)); 1568 pr_info("%s", buf); 1569 } 1570 1571 if (!hlist_empty(&priv->mcast_fwds)) 1572 pr_info("Multicast Forward VCCs\n"); 1573 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) { 1574 offset = 0; 1575 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1576 offset += sprintf(buf + offset, " Atm:"); 1577 for (j = 0; j < ATM_ESA_LEN; j++) { 1578 offset += sprintf(buf + offset, "%2.2x ", 1579 rulla->atm_addr[j] & 0xff); 1580 } 1581 offset += sprintf(buf + offset, 1582 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1583 rulla->vcc ? rulla->vcc->vpi : 0, 1584 rulla->vcc ? rulla->vcc->vci : 0, 1585 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1586 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1587 rulla->last_used, 1588 rulla->timestamp, rulla->no_tries); 1589 offset += sprintf(buf + offset, 1590 "Flags:%x, Packets_flooded:%x, Status: %s ", 1591 rulla->flags, rulla->packets_flooded, 1592 get_status_string(rulla->status)); 1593 pr_info("%s\n", buf); 1594 } 1595 1596 } 1597 #else 1598 #define dump_arp_table(priv) do { } while (0) 1599 #endif 1600 1601 /* 1602 * Destruction of arp-cache 1603 */ 1604 static void lec_arp_destroy(struct lec_priv *priv) 1605 { 1606 unsigned long flags; 1607 struct hlist_node *node, *next; 1608 struct lec_arp_table *entry; 1609 int i; 1610 1611 cancel_rearming_delayed_work(&priv->lec_arp_work); 1612 1613 /* 1614 * Remove all entries 1615 */ 1616 1617 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1618 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1619 hlist_for_each_entry_safe(entry, node, next, 1620 &priv->lec_arp_tables[i], next) { 1621 lec_arp_remove(priv, entry); 1622 lec_arp_put(entry); 1623 } 1624 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1625 } 1626 1627 hlist_for_each_entry_safe(entry, node, next, 1628 &priv->lec_arp_empty_ones, next) { 1629 del_timer_sync(&entry->timer); 1630 lec_arp_clear_vccs(entry); 1631 hlist_del(&entry->next); 1632 lec_arp_put(entry); 1633 } 1634 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1635 1636 hlist_for_each_entry_safe(entry, node, next, 1637 &priv->lec_no_forward, next) { 1638 del_timer_sync(&entry->timer); 1639 lec_arp_clear_vccs(entry); 1640 hlist_del(&entry->next); 1641 lec_arp_put(entry); 1642 } 1643 INIT_HLIST_HEAD(&priv->lec_no_forward); 1644 1645 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 1646 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1647 lec_arp_clear_vccs(entry); 1648 hlist_del(&entry->next); 1649 lec_arp_put(entry); 1650 } 1651 INIT_HLIST_HEAD(&priv->mcast_fwds); 1652 priv->mcast_vcc = NULL; 1653 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1654 } 1655 1656 /* 1657 * Find entry by mac_address 1658 */ 1659 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1660 const unsigned char *mac_addr) 1661 { 1662 struct hlist_node *node; 1663 struct hlist_head *head; 1664 struct lec_arp_table *entry; 1665 1666 pr_debug("%pM\n", mac_addr); 1667 1668 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1669 hlist_for_each_entry(entry, node, head, next) { 1670 if (!compare_ether_addr(mac_addr, entry->mac_addr)) 1671 return entry; 1672 } 1673 return NULL; 1674 } 1675 1676 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1677 const unsigned char *mac_addr) 1678 { 1679 struct lec_arp_table *to_return; 1680 1681 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1682 if (!to_return) { 1683 pr_info("LEC: Arp entry kmalloc failed\n"); 1684 return NULL; 1685 } 1686 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN); 1687 INIT_HLIST_NODE(&to_return->next); 1688 setup_timer(&to_return->timer, lec_arp_expire_arp, 1689 (unsigned long)to_return); 1690 to_return->last_used = jiffies; 1691 to_return->priv = priv; 1692 skb_queue_head_init(&to_return->tx_wait); 1693 atomic_set(&to_return->usage, 1); 1694 return to_return; 1695 } 1696 1697 /* Arp sent timer expired */ 1698 static void lec_arp_expire_arp(unsigned long data) 1699 { 1700 struct lec_arp_table *entry; 1701 1702 entry = (struct lec_arp_table *)data; 1703 1704 pr_debug("\n"); 1705 if (entry->status == ESI_ARP_PENDING) { 1706 if (entry->no_tries <= entry->priv->max_retry_count) { 1707 if (entry->is_rdesc) 1708 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1709 entry->mac_addr, NULL, NULL); 1710 else 1711 send_to_lecd(entry->priv, l_arp_xmt, 1712 entry->mac_addr, NULL, NULL); 1713 entry->no_tries++; 1714 } 1715 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1716 } 1717 } 1718 1719 /* Unknown/unused vcc expire, remove associated entry */ 1720 static void lec_arp_expire_vcc(unsigned long data) 1721 { 1722 unsigned long flags; 1723 struct lec_arp_table *to_remove = (struct lec_arp_table *)data; 1724 struct lec_priv *priv = (struct lec_priv *)to_remove->priv; 1725 1726 del_timer(&to_remove->timer); 1727 1728 pr_debug("%p %p: vpi:%d vci:%d\n", 1729 to_remove, priv, 1730 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1731 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1732 1733 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1734 hlist_del(&to_remove->next); 1735 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1736 1737 lec_arp_clear_vccs(to_remove); 1738 lec_arp_put(to_remove); 1739 } 1740 1741 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1742 unsigned long now, 1743 struct lec_priv *priv) 1744 { 1745 unsigned long time_to_check; 1746 1747 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1748 time_to_check = priv->forward_delay_time; 1749 else 1750 time_to_check = priv->aging_time; 1751 1752 pr_debug("About to expire: %lx - %lx > %lx\n", 1753 now, entry->last_used, time_to_check); 1754 if (time_after(now, entry->last_used + time_to_check) && 1755 !(entry->flags & LEC_PERMANENT_FLAG) && 1756 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1757 /* Remove entry */ 1758 pr_debug("Entry timed out\n"); 1759 lec_arp_remove(priv, entry); 1760 lec_arp_put(entry); 1761 } else { 1762 /* Something else */ 1763 if ((entry->status == ESI_VC_PENDING || 1764 entry->status == ESI_ARP_PENDING) && 1765 time_after_eq(now, entry->timestamp + 1766 priv->max_unknown_frame_time)) { 1767 entry->timestamp = jiffies; 1768 entry->packets_flooded = 0; 1769 if (entry->status == ESI_VC_PENDING) 1770 send_to_lecd(priv, l_svc_setup, 1771 entry->mac_addr, 1772 entry->atm_addr, 1773 NULL); 1774 } 1775 if (entry->status == ESI_FLUSH_PENDING && 1776 time_after_eq(now, entry->timestamp + 1777 priv->path_switching_delay)) { 1778 lec_arp_hold(entry); 1779 return true; 1780 } 1781 } 1782 1783 return false; 1784 } 1785 /* 1786 * Expire entries. 1787 * 1. Re-set timer 1788 * 2. For each entry, delete entries that have aged past the age limit. 1789 * 3. For each entry, depending on the status of the entry, perform 1790 * the following maintenance. 1791 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1792 * tick_count is above the max_unknown_frame_time, clear 1793 * the tick_count to zero and clear the packets_flooded counter 1794 * to zero. This supports the packet rate limit per address 1795 * while flooding unknowns. 1796 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1797 * than or equal to the path_switching_delay, change the status 1798 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1799 * regardless of the progress of the flush protocol. 1800 */ 1801 static void lec_arp_check_expire(struct work_struct *work) 1802 { 1803 unsigned long flags; 1804 struct lec_priv *priv = 1805 container_of(work, struct lec_priv, lec_arp_work.work); 1806 struct hlist_node *node, *next; 1807 struct lec_arp_table *entry; 1808 unsigned long now; 1809 int i; 1810 1811 pr_debug("%p\n", priv); 1812 now = jiffies; 1813 restart: 1814 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1815 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1816 hlist_for_each_entry_safe(entry, node, next, 1817 &priv->lec_arp_tables[i], next) { 1818 if (__lec_arp_check_expire(entry, now, priv)) { 1819 struct sk_buff *skb; 1820 struct atm_vcc *vcc = entry->vcc; 1821 1822 spin_unlock_irqrestore(&priv->lec_arp_lock, 1823 flags); 1824 while ((skb = skb_dequeue(&entry->tx_wait))) 1825 lec_send(vcc, skb); 1826 entry->last_used = jiffies; 1827 entry->status = ESI_FORWARD_DIRECT; 1828 lec_arp_put(entry); 1829 1830 goto restart; 1831 } 1832 } 1833 } 1834 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1835 1836 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1837 } 1838 1839 /* 1840 * Try to find vcc where mac_address is attached. 1841 * 1842 */ 1843 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1844 const unsigned char *mac_to_find, 1845 int is_rdesc, 1846 struct lec_arp_table **ret_entry) 1847 { 1848 unsigned long flags; 1849 struct lec_arp_table *entry; 1850 struct atm_vcc *found; 1851 1852 if (mac_to_find[0] & 0x01) { 1853 switch (priv->lane_version) { 1854 case 1: 1855 return priv->mcast_vcc; 1856 case 2: /* LANE2 wants arp for multicast addresses */ 1857 if (!compare_ether_addr(mac_to_find, bus_mac)) 1858 return priv->mcast_vcc; 1859 break; 1860 default: 1861 break; 1862 } 1863 } 1864 1865 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1866 entry = lec_arp_find(priv, mac_to_find); 1867 1868 if (entry) { 1869 if (entry->status == ESI_FORWARD_DIRECT) { 1870 /* Connection Ok */ 1871 entry->last_used = jiffies; 1872 lec_arp_hold(entry); 1873 *ret_entry = entry; 1874 found = entry->vcc; 1875 goto out; 1876 } 1877 /* 1878 * If the LE_ARP cache entry is still pending, reset count to 0 1879 * so another LE_ARP request can be made for this frame. 1880 */ 1881 if (entry->status == ESI_ARP_PENDING) 1882 entry->no_tries = 0; 1883 /* 1884 * Data direct VC not yet set up, check to see if the unknown 1885 * frame count is greater than the limit. If the limit has 1886 * not been reached, allow the caller to send packet to 1887 * BUS. 1888 */ 1889 if (entry->status != ESI_FLUSH_PENDING && 1890 entry->packets_flooded < 1891 priv->maximum_unknown_frame_count) { 1892 entry->packets_flooded++; 1893 pr_debug("Flooding..\n"); 1894 found = priv->mcast_vcc; 1895 goto out; 1896 } 1897 /* 1898 * We got here because entry->status == ESI_FLUSH_PENDING 1899 * or BUS flood limit was reached for an entry which is 1900 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1901 */ 1902 lec_arp_hold(entry); 1903 *ret_entry = entry; 1904 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1905 entry->vcc); 1906 found = NULL; 1907 } else { 1908 /* No matching entry was found */ 1909 entry = make_entry(priv, mac_to_find); 1910 pr_debug("Making entry\n"); 1911 if (!entry) { 1912 found = priv->mcast_vcc; 1913 goto out; 1914 } 1915 lec_arp_add(priv, entry); 1916 /* We want arp-request(s) to be sent */ 1917 entry->packets_flooded = 1; 1918 entry->status = ESI_ARP_PENDING; 1919 entry->no_tries = 1; 1920 entry->last_used = entry->timestamp = jiffies; 1921 entry->is_rdesc = is_rdesc; 1922 if (entry->is_rdesc) 1923 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1924 NULL); 1925 else 1926 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1927 entry->timer.expires = jiffies + (1 * HZ); 1928 entry->timer.function = lec_arp_expire_arp; 1929 add_timer(&entry->timer); 1930 found = priv->mcast_vcc; 1931 } 1932 1933 out: 1934 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1935 return found; 1936 } 1937 1938 static int 1939 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1940 unsigned long permanent) 1941 { 1942 unsigned long flags; 1943 struct hlist_node *node, *next; 1944 struct lec_arp_table *entry; 1945 int i; 1946 1947 pr_debug("\n"); 1948 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1949 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1950 hlist_for_each_entry_safe(entry, node, next, 1951 &priv->lec_arp_tables[i], next) { 1952 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1953 (permanent || 1954 !(entry->flags & LEC_PERMANENT_FLAG))) { 1955 lec_arp_remove(priv, entry); 1956 lec_arp_put(entry); 1957 } 1958 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1959 return 0; 1960 } 1961 } 1962 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1963 return -1; 1964 } 1965 1966 /* 1967 * Notifies: Response to arp_request (atm_addr != NULL) 1968 */ 1969 static void 1970 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1971 const unsigned char *atm_addr, unsigned long remoteflag, 1972 unsigned int targetless_le_arp) 1973 { 1974 unsigned long flags; 1975 struct hlist_node *node, *next; 1976 struct lec_arp_table *entry, *tmp; 1977 int i; 1978 1979 pr_debug("%smac:%pM\n", 1980 (targetless_le_arp) ? "targetless " : "", mac_addr); 1981 1982 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1983 entry = lec_arp_find(priv, mac_addr); 1984 if (entry == NULL && targetless_le_arp) 1985 goto out; /* 1986 * LANE2: ignore targetless LE_ARPs for which 1987 * we have no entry in the cache. 7.1.30 1988 */ 1989 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1990 hlist_for_each_entry_safe(entry, node, next, 1991 &priv->lec_arp_empty_ones, next) { 1992 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1993 hlist_del(&entry->next); 1994 del_timer(&entry->timer); 1995 tmp = lec_arp_find(priv, mac_addr); 1996 if (tmp) { 1997 del_timer(&tmp->timer); 1998 tmp->status = ESI_FORWARD_DIRECT; 1999 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 2000 tmp->vcc = entry->vcc; 2001 tmp->old_push = entry->old_push; 2002 tmp->last_used = jiffies; 2003 del_timer(&entry->timer); 2004 lec_arp_put(entry); 2005 entry = tmp; 2006 } else { 2007 entry->status = ESI_FORWARD_DIRECT; 2008 memcpy(entry->mac_addr, mac_addr, ETH_ALEN); 2009 entry->last_used = jiffies; 2010 lec_arp_add(priv, entry); 2011 } 2012 if (remoteflag) 2013 entry->flags |= LEC_REMOTE_FLAG; 2014 else 2015 entry->flags &= ~LEC_REMOTE_FLAG; 2016 pr_debug("After update\n"); 2017 dump_arp_table(priv); 2018 goto out; 2019 } 2020 } 2021 } 2022 2023 entry = lec_arp_find(priv, mac_addr); 2024 if (!entry) { 2025 entry = make_entry(priv, mac_addr); 2026 if (!entry) 2027 goto out; 2028 entry->status = ESI_UNKNOWN; 2029 lec_arp_add(priv, entry); 2030 /* Temporary, changes before end of function */ 2031 } 2032 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 2033 del_timer(&entry->timer); 2034 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2035 hlist_for_each_entry(tmp, node, 2036 &priv->lec_arp_tables[i], next) { 2037 if (entry != tmp && 2038 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 2039 /* Vcc to this host exists */ 2040 if (tmp->status > ESI_VC_PENDING) { 2041 /* 2042 * ESI_FLUSH_PENDING, 2043 * ESI_FORWARD_DIRECT 2044 */ 2045 entry->vcc = tmp->vcc; 2046 entry->old_push = tmp->old_push; 2047 } 2048 entry->status = tmp->status; 2049 break; 2050 } 2051 } 2052 } 2053 if (remoteflag) 2054 entry->flags |= LEC_REMOTE_FLAG; 2055 else 2056 entry->flags &= ~LEC_REMOTE_FLAG; 2057 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 2058 entry->status = ESI_VC_PENDING; 2059 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 2060 } 2061 pr_debug("After update2\n"); 2062 dump_arp_table(priv); 2063 out: 2064 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2065 } 2066 2067 /* 2068 * Notifies: Vcc setup ready 2069 */ 2070 static void 2071 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 2072 struct atm_vcc *vcc, 2073 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 2074 { 2075 unsigned long flags; 2076 struct hlist_node *node; 2077 struct lec_arp_table *entry; 2078 int i, found_entry = 0; 2079 2080 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2081 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2082 if (ioc_data->receive == 2) { 2083 pr_debug("LEC_ARP: Attaching mcast forward\n"); 2084 #if 0 2085 entry = lec_arp_find(priv, bus_mac); 2086 if (!entry) { 2087 pr_info("LEC_ARP: Multicast entry not found!\n"); 2088 goto out; 2089 } 2090 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2091 entry->recv_vcc = vcc; 2092 entry->old_recv_push = old_push; 2093 #endif 2094 entry = make_entry(priv, bus_mac); 2095 if (entry == NULL) 2096 goto out; 2097 del_timer(&entry->timer); 2098 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2099 entry->recv_vcc = vcc; 2100 entry->old_recv_push = old_push; 2101 hlist_add_head(&entry->next, &priv->mcast_fwds); 2102 goto out; 2103 } else if (ioc_data->receive == 1) { 2104 /* 2105 * Vcc which we don't want to make default vcc, 2106 * attach it anyway. 2107 */ 2108 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", 2109 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2110 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2111 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2112 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2113 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2114 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2115 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2116 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2117 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2118 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2119 entry = make_entry(priv, bus_mac); 2120 if (entry == NULL) 2121 goto out; 2122 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2123 memset(entry->mac_addr, 0, ETH_ALEN); 2124 entry->recv_vcc = vcc; 2125 entry->old_recv_push = old_push; 2126 entry->status = ESI_UNKNOWN; 2127 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2128 entry->timer.function = lec_arp_expire_vcc; 2129 hlist_add_head(&entry->next, &priv->lec_no_forward); 2130 add_timer(&entry->timer); 2131 dump_arp_table(priv); 2132 goto out; 2133 } 2134 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", 2135 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2136 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2137 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2138 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2139 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2140 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2141 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2142 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2143 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2144 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2145 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2146 hlist_for_each_entry(entry, node, 2147 &priv->lec_arp_tables[i], next) { 2148 if (memcmp 2149 (ioc_data->atm_addr, entry->atm_addr, 2150 ATM_ESA_LEN) == 0) { 2151 pr_debug("LEC_ARP: Attaching data direct\n"); 2152 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 2153 entry->vcc ? entry->vcc->vci : 0, 2154 entry->recv_vcc ? entry->recv_vcc-> 2155 vci : 0); 2156 found_entry = 1; 2157 del_timer(&entry->timer); 2158 entry->vcc = vcc; 2159 entry->old_push = old_push; 2160 if (entry->status == ESI_VC_PENDING) { 2161 if (priv->maximum_unknown_frame_count 2162 == 0) 2163 entry->status = 2164 ESI_FORWARD_DIRECT; 2165 else { 2166 entry->timestamp = jiffies; 2167 entry->status = 2168 ESI_FLUSH_PENDING; 2169 #if 0 2170 send_to_lecd(priv, l_flush_xmt, 2171 NULL, 2172 entry->atm_addr, 2173 NULL); 2174 #endif 2175 } 2176 } else { 2177 /* 2178 * They were forming a connection 2179 * to us, and we to them. Our 2180 * ATM address is numerically lower 2181 * than theirs, so we make connection 2182 * we formed into default VCC (8.1.11). 2183 * Connection they made gets torn 2184 * down. This might confuse some 2185 * clients. Can be changed if 2186 * someone reports trouble... 2187 */ 2188 ; 2189 } 2190 } 2191 } 2192 } 2193 if (found_entry) { 2194 pr_debug("After vcc was added\n"); 2195 dump_arp_table(priv); 2196 goto out; 2197 } 2198 /* 2199 * Not found, snatch address from first data packet that arrives 2200 * from this vcc 2201 */ 2202 entry = make_entry(priv, bus_mac); 2203 if (!entry) 2204 goto out; 2205 entry->vcc = vcc; 2206 entry->old_push = old_push; 2207 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2208 memset(entry->mac_addr, 0, ETH_ALEN); 2209 entry->status = ESI_UNKNOWN; 2210 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2211 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2212 entry->timer.function = lec_arp_expire_vcc; 2213 add_timer(&entry->timer); 2214 pr_debug("After vcc was added\n"); 2215 dump_arp_table(priv); 2216 out: 2217 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2218 } 2219 2220 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2221 { 2222 unsigned long flags; 2223 struct hlist_node *node; 2224 struct lec_arp_table *entry; 2225 int i; 2226 2227 pr_debug("%lx\n", tran_id); 2228 restart: 2229 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2230 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2231 hlist_for_each_entry(entry, node, 2232 &priv->lec_arp_tables[i], next) { 2233 if (entry->flush_tran_id == tran_id && 2234 entry->status == ESI_FLUSH_PENDING) { 2235 struct sk_buff *skb; 2236 struct atm_vcc *vcc = entry->vcc; 2237 2238 lec_arp_hold(entry); 2239 spin_unlock_irqrestore(&priv->lec_arp_lock, 2240 flags); 2241 while ((skb = skb_dequeue(&entry->tx_wait))) 2242 lec_send(vcc, skb); 2243 entry->last_used = jiffies; 2244 entry->status = ESI_FORWARD_DIRECT; 2245 lec_arp_put(entry); 2246 pr_debug("LEC_ARP: Flushed\n"); 2247 goto restart; 2248 } 2249 } 2250 } 2251 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2252 dump_arp_table(priv); 2253 } 2254 2255 static void 2256 lec_set_flush_tran_id(struct lec_priv *priv, 2257 const unsigned char *atm_addr, unsigned long tran_id) 2258 { 2259 unsigned long flags; 2260 struct hlist_node *node; 2261 struct lec_arp_table *entry; 2262 int i; 2263 2264 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2265 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2266 hlist_for_each_entry(entry, node, 2267 &priv->lec_arp_tables[i], next) { 2268 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2269 entry->flush_tran_id = tran_id; 2270 pr_debug("Set flush transaction id to %lx for %p\n", 2271 tran_id, entry); 2272 } 2273 } 2274 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2275 } 2276 2277 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2278 { 2279 unsigned long flags; 2280 unsigned char mac_addr[] = { 2281 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2282 }; 2283 struct lec_arp_table *to_add; 2284 struct lec_vcc_priv *vpriv; 2285 int err = 0; 2286 2287 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 2288 if (!vpriv) 2289 return -ENOMEM; 2290 vpriv->xoff = 0; 2291 vpriv->old_pop = vcc->pop; 2292 vcc->user_back = vpriv; 2293 vcc->pop = lec_pop; 2294 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2295 to_add = make_entry(priv, mac_addr); 2296 if (!to_add) { 2297 vcc->pop = vpriv->old_pop; 2298 kfree(vpriv); 2299 err = -ENOMEM; 2300 goto out; 2301 } 2302 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2303 to_add->status = ESI_FORWARD_DIRECT; 2304 to_add->flags |= LEC_PERMANENT_FLAG; 2305 to_add->vcc = vcc; 2306 to_add->old_push = vcc->push; 2307 vcc->push = lec_push; 2308 priv->mcast_vcc = vcc; 2309 lec_arp_add(priv, to_add); 2310 out: 2311 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2312 return err; 2313 } 2314 2315 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2316 { 2317 unsigned long flags; 2318 struct hlist_node *node, *next; 2319 struct lec_arp_table *entry; 2320 int i; 2321 2322 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2323 dump_arp_table(priv); 2324 2325 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2326 2327 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2328 hlist_for_each_entry_safe(entry, node, next, 2329 &priv->lec_arp_tables[i], next) { 2330 if (vcc == entry->vcc) { 2331 lec_arp_remove(priv, entry); 2332 lec_arp_put(entry); 2333 if (priv->mcast_vcc == vcc) 2334 priv->mcast_vcc = NULL; 2335 } 2336 } 2337 } 2338 2339 hlist_for_each_entry_safe(entry, node, next, 2340 &priv->lec_arp_empty_ones, next) { 2341 if (entry->vcc == vcc) { 2342 lec_arp_clear_vccs(entry); 2343 del_timer(&entry->timer); 2344 hlist_del(&entry->next); 2345 lec_arp_put(entry); 2346 } 2347 } 2348 2349 hlist_for_each_entry_safe(entry, node, next, 2350 &priv->lec_no_forward, next) { 2351 if (entry->recv_vcc == vcc) { 2352 lec_arp_clear_vccs(entry); 2353 del_timer(&entry->timer); 2354 hlist_del(&entry->next); 2355 lec_arp_put(entry); 2356 } 2357 } 2358 2359 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) { 2360 if (entry->recv_vcc == vcc) { 2361 lec_arp_clear_vccs(entry); 2362 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2363 hlist_del(&entry->next); 2364 lec_arp_put(entry); 2365 } 2366 } 2367 2368 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2369 dump_arp_table(priv); 2370 } 2371 2372 static void 2373 lec_arp_check_empties(struct lec_priv *priv, 2374 struct atm_vcc *vcc, struct sk_buff *skb) 2375 { 2376 unsigned long flags; 2377 struct hlist_node *node, *next; 2378 struct lec_arp_table *entry, *tmp; 2379 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2380 unsigned char *src; 2381 #ifdef CONFIG_TR 2382 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data; 2383 2384 if (priv->is_trdev) 2385 src = tr_hdr->h_source; 2386 else 2387 #endif 2388 src = hdr->h_source; 2389 2390 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2391 hlist_for_each_entry_safe(entry, node, next, 2392 &priv->lec_arp_empty_ones, next) { 2393 if (vcc == entry->vcc) { 2394 del_timer(&entry->timer); 2395 memcpy(entry->mac_addr, src, ETH_ALEN); 2396 entry->status = ESI_FORWARD_DIRECT; 2397 entry->last_used = jiffies; 2398 /* We might have got an entry */ 2399 tmp = lec_arp_find(priv, src); 2400 if (tmp) { 2401 lec_arp_remove(priv, tmp); 2402 lec_arp_put(tmp); 2403 } 2404 hlist_del(&entry->next); 2405 lec_arp_add(priv, entry); 2406 goto out; 2407 } 2408 } 2409 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2410 out: 2411 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2412 } 2413 2414 MODULE_LICENSE("GPL"); 2415