1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * lec.c: Lan Emulation driver 4 * 5 * Marko Kiiskila <mkiiskila@yahoo.com> 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 9 10 #include <linux/slab.h> 11 #include <linux/kernel.h> 12 #include <linux/bitops.h> 13 #include <linux/capability.h> 14 15 /* We are ethernet device */ 16 #include <linux/if_ether.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <net/sock.h> 20 #include <linux/skbuff.h> 21 #include <linux/ip.h> 22 #include <asm/byteorder.h> 23 #include <linux/uaccess.h> 24 #include <net/arp.h> 25 #include <net/dst.h> 26 #include <linux/proc_fs.h> 27 #include <linux/spinlock.h> 28 #include <linux/seq_file.h> 29 30 /* And atm device */ 31 #include <linux/atmdev.h> 32 #include <linux/atmlec.h> 33 34 /* Proxy LEC knows about bridging */ 35 #if IS_ENABLED(CONFIG_BRIDGE) 36 #include "../bridge/br_private.h" 37 38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 }; 39 #endif 40 41 /* Modular too */ 42 #include <linux/module.h> 43 #include <linux/init.h> 44 45 /* Hardening for Spectre-v1 */ 46 #include <linux/nospec.h> 47 48 #include "lec.h" 49 #include "lec_arpc.h" 50 #include "resources.h" 51 52 #define DUMP_PACKETS 0 /* 53 * 0 = None, 54 * 1 = 30 first bytes 55 * 2 = Whole packet 56 */ 57 58 #define LEC_UNRES_QUE_LEN 8 /* 59 * number of tx packets to queue for a 60 * single destination while waiting for SVC 61 */ 62 63 static int lec_open(struct net_device *dev); 64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 65 struct net_device *dev); 66 static int lec_close(struct net_device *dev); 67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 68 const unsigned char *mac_addr); 69 static int lec_arp_remove(struct lec_priv *priv, 70 struct lec_arp_table *to_remove); 71 /* LANE2 functions */ 72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address, 73 const u8 *tlvs, u32 sizeoftlvs); 74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 75 u8 **tlvs, u32 *sizeoftlvs); 76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 77 const u8 *tlvs, u32 sizeoftlvs); 78 79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 80 unsigned long permanent); 81 static void lec_arp_check_empties(struct lec_priv *priv, 82 struct atm_vcc *vcc, struct sk_buff *skb); 83 static void lec_arp_destroy(struct lec_priv *priv); 84 static void lec_arp_init(struct lec_priv *priv); 85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 86 const unsigned char *mac_to_find, 87 int is_rdesc, 88 struct lec_arp_table **ret_entry); 89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 90 const unsigned char *atm_addr, 91 unsigned long remoteflag, 92 unsigned int targetless_le_arp); 93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id); 94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc); 95 static void lec_set_flush_tran_id(struct lec_priv *priv, 96 const unsigned char *atm_addr, 97 unsigned long tran_id); 98 static void lec_vcc_added(struct lec_priv *priv, 99 const struct atmlec_ioc *ioc_data, 100 struct atm_vcc *vcc, 101 void (*old_push)(struct atm_vcc *vcc, 102 struct sk_buff *skb)); 103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc); 104 105 /* must be done under lec_arp_lock */ 106 static inline void lec_arp_hold(struct lec_arp_table *entry) 107 { 108 refcount_inc(&entry->usage); 109 } 110 111 static inline void lec_arp_put(struct lec_arp_table *entry) 112 { 113 if (refcount_dec_and_test(&entry->usage)) 114 kfree(entry); 115 } 116 117 static struct lane2_ops lane2_ops = { 118 .resolve = lane2_resolve, /* spec 3.1.3 */ 119 .associate_req = lane2_associate_req, /* spec 3.1.4 */ 120 .associate_indicator = NULL /* spec 3.1.5 */ 121 }; 122 123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 124 125 /* Device structures */ 126 static struct net_device *dev_lec[MAX_LEC_ITF]; 127 128 #if IS_ENABLED(CONFIG_BRIDGE) 129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev) 130 { 131 char *buff; 132 struct lec_priv *priv; 133 134 /* 135 * Check if this is a BPDU. If so, ask zeppelin to send 136 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit 137 * as the Config BPDU has 138 */ 139 buff = skb->data + skb->dev->hard_header_len; 140 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) { 141 struct sock *sk; 142 struct sk_buff *skb2; 143 struct atmlec_msg *mesg; 144 145 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 146 if (skb2 == NULL) 147 return; 148 skb2->len = sizeof(struct atmlec_msg); 149 mesg = (struct atmlec_msg *)skb2->data; 150 mesg->type = l_topology_change; 151 buff += 4; 152 mesg->content.normal.flag = *buff & 0x01; 153 /* 0x01 is topology change */ 154 155 priv = netdev_priv(dev); 156 atm_force_charge(priv->lecd, skb2->truesize); 157 sk = sk_atm(priv->lecd); 158 skb_queue_tail(&sk->sk_receive_queue, skb2); 159 sk->sk_data_ready(sk); 160 } 161 } 162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 163 164 /* 165 * Open/initialize the netdevice. This is called (in the current kernel) 166 * sometime after booting when the 'ifconfig' program is run. 167 * 168 * This routine should set everything up anew at each open, even 169 * registers that "should" only need to be set once at boot, so that 170 * there is non-reboot way to recover if something goes wrong. 171 */ 172 173 static int lec_open(struct net_device *dev) 174 { 175 netif_start_queue(dev); 176 177 return 0; 178 } 179 180 static void 181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb) 182 { 183 struct net_device *dev = skb->dev; 184 185 ATM_SKB(skb)->vcc = vcc; 186 atm_account_tx(vcc, skb); 187 188 if (vcc->send(vcc, skb) < 0) { 189 dev->stats.tx_dropped++; 190 return; 191 } 192 193 dev->stats.tx_packets++; 194 dev->stats.tx_bytes += skb->len; 195 } 196 197 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue) 198 { 199 pr_info("%s\n", dev->name); 200 netif_trans_update(dev); 201 netif_wake_queue(dev); 202 } 203 204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb, 205 struct net_device *dev) 206 { 207 struct sk_buff *skb2; 208 struct lec_priv *priv = netdev_priv(dev); 209 struct lecdatahdr_8023 *lec_h; 210 struct atm_vcc *vcc; 211 struct lec_arp_table *entry; 212 unsigned char *dst; 213 int min_frame_size; 214 int is_rdesc; 215 216 pr_debug("called\n"); 217 if (!priv->lecd) { 218 pr_info("%s:No lecd attached\n", dev->name); 219 dev->stats.tx_errors++; 220 netif_stop_queue(dev); 221 kfree_skb(skb); 222 return NETDEV_TX_OK; 223 } 224 225 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n", 226 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb), 227 (long)skb_end_pointer(skb)); 228 #if IS_ENABLED(CONFIG_BRIDGE) 229 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) 230 lec_handle_bridge(skb, dev); 231 #endif 232 233 /* Make sure we have room for lec_id */ 234 if (skb_headroom(skb) < 2) { 235 pr_debug("reallocating skb\n"); 236 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); 237 if (unlikely(!skb2)) { 238 kfree_skb(skb); 239 return NETDEV_TX_OK; 240 } 241 consume_skb(skb); 242 skb = skb2; 243 } 244 skb_push(skb, 2); 245 246 /* Put le header to place */ 247 lec_h = (struct lecdatahdr_8023 *)skb->data; 248 lec_h->le_header = htons(priv->lecid); 249 250 #if DUMP_PACKETS >= 2 251 #define MAX_DUMP_SKB 99 252 #elif DUMP_PACKETS >= 1 253 #define MAX_DUMP_SKB 30 254 #endif 255 #if DUMP_PACKETS >= 1 256 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n", 257 dev->name, skb->len, priv->lecid); 258 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 259 skb->data, min(skb->len, MAX_DUMP_SKB), true); 260 #endif /* DUMP_PACKETS >= 1 */ 261 262 /* Minimum ethernet-frame size */ 263 min_frame_size = LEC_MINIMUM_8023_SIZE; 264 if (skb->len < min_frame_size) { 265 if ((skb->len + skb_tailroom(skb)) < min_frame_size) { 266 skb2 = skb_copy_expand(skb, 0, 267 min_frame_size - skb->truesize, 268 GFP_ATOMIC); 269 dev_kfree_skb(skb); 270 if (skb2 == NULL) { 271 dev->stats.tx_dropped++; 272 return NETDEV_TX_OK; 273 } 274 skb = skb2; 275 } 276 skb_put(skb, min_frame_size - skb->len); 277 } 278 279 /* Send to right vcc */ 280 is_rdesc = 0; 281 dst = lec_h->h_dest; 282 entry = NULL; 283 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); 284 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", 285 dev->name, vcc, vcc ? vcc->flags : 0, entry); 286 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) { 287 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { 288 pr_debug("%s:queuing packet, MAC address %pM\n", 289 dev->name, lec_h->h_dest); 290 skb_queue_tail(&entry->tx_wait, skb); 291 } else { 292 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n", 293 dev->name, lec_h->h_dest); 294 dev->stats.tx_dropped++; 295 dev_kfree_skb(skb); 296 } 297 goto out; 298 } 299 #if DUMP_PACKETS > 0 300 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n", 301 dev->name, vcc->vpi, vcc->vci); 302 #endif /* DUMP_PACKETS > 0 */ 303 304 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { 305 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest); 306 lec_send(vcc, skb2); 307 } 308 309 lec_send(vcc, skb); 310 311 if (!atm_may_send(vcc, 0)) { 312 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 313 314 vpriv->xoff = 1; 315 netif_stop_queue(dev); 316 317 /* 318 * vcc->pop() might have occurred in between, making 319 * the vcc usuable again. Since xmit is serialized, 320 * this is the only situation we have to re-test. 321 */ 322 323 if (atm_may_send(vcc, 0)) 324 netif_wake_queue(dev); 325 } 326 327 out: 328 if (entry) 329 lec_arp_put(entry); 330 netif_trans_update(dev); 331 return NETDEV_TX_OK; 332 } 333 334 /* The inverse routine to net_open(). */ 335 static int lec_close(struct net_device *dev) 336 { 337 netif_stop_queue(dev); 338 return 0; 339 } 340 341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 342 { 343 unsigned long flags; 344 struct net_device *dev = (struct net_device *)vcc->proto_data; 345 struct lec_priv *priv = netdev_priv(dev); 346 struct atmlec_msg *mesg; 347 struct lec_arp_table *entry; 348 int i; 349 char *tmp; /* FIXME */ 350 351 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); 352 mesg = (struct atmlec_msg *)skb->data; 353 tmp = skb->data; 354 tmp += sizeof(struct atmlec_msg); 355 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type); 356 switch (mesg->type) { 357 case l_set_mac_addr: 358 for (i = 0; i < 6; i++) 359 dev->dev_addr[i] = mesg->content.normal.mac_addr[i]; 360 break; 361 case l_del_mac_addr: 362 for (i = 0; i < 6; i++) 363 dev->dev_addr[i] = 0; 364 break; 365 case l_addr_delete: 366 lec_addr_delete(priv, mesg->content.normal.atm_addr, 367 mesg->content.normal.flag); 368 break; 369 case l_topology_change: 370 priv->topology_change = mesg->content.normal.flag; 371 break; 372 case l_flush_complete: 373 lec_flush_complete(priv, mesg->content.normal.flag); 374 break; 375 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ 376 spin_lock_irqsave(&priv->lec_arp_lock, flags); 377 entry = lec_arp_find(priv, mesg->content.normal.mac_addr); 378 lec_arp_remove(priv, entry); 379 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 380 381 if (mesg->content.normal.no_source_le_narp) 382 break; 383 /* FALL THROUGH */ 384 case l_arp_update: 385 lec_arp_update(priv, mesg->content.normal.mac_addr, 386 mesg->content.normal.atm_addr, 387 mesg->content.normal.flag, 388 mesg->content.normal.targetless_le_arp); 389 pr_debug("in l_arp_update\n"); 390 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ 391 pr_debug("LANE2 3.1.5, got tlvs, size %d\n", 392 mesg->sizeoftlvs); 393 lane2_associate_ind(dev, mesg->content.normal.mac_addr, 394 tmp, mesg->sizeoftlvs); 395 } 396 break; 397 case l_config: 398 priv->maximum_unknown_frame_count = 399 mesg->content.config.maximum_unknown_frame_count; 400 priv->max_unknown_frame_time = 401 (mesg->content.config.max_unknown_frame_time * HZ); 402 priv->max_retry_count = mesg->content.config.max_retry_count; 403 priv->aging_time = (mesg->content.config.aging_time * HZ); 404 priv->forward_delay_time = 405 (mesg->content.config.forward_delay_time * HZ); 406 priv->arp_response_time = 407 (mesg->content.config.arp_response_time * HZ); 408 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ); 409 priv->path_switching_delay = 410 (mesg->content.config.path_switching_delay * HZ); 411 priv->lane_version = mesg->content.config.lane_version; 412 /* LANE2 */ 413 priv->lane2_ops = NULL; 414 if (priv->lane_version > 1) 415 priv->lane2_ops = &lane2_ops; 416 rtnl_lock(); 417 if (dev_set_mtu(dev, mesg->content.config.mtu)) 418 pr_info("%s: change_mtu to %d failed\n", 419 dev->name, mesg->content.config.mtu); 420 rtnl_unlock(); 421 priv->is_proxy = mesg->content.config.is_proxy; 422 break; 423 case l_flush_tran_id: 424 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, 425 mesg->content.normal.flag); 426 break; 427 case l_set_lecid: 428 priv->lecid = 429 (unsigned short)(0xffff & mesg->content.normal.flag); 430 break; 431 case l_should_bridge: 432 #if IS_ENABLED(CONFIG_BRIDGE) 433 { 434 pr_debug("%s: bridge zeppelin asks about %pM\n", 435 dev->name, mesg->content.proxy.mac_addr); 436 437 if (br_fdb_test_addr_hook == NULL) 438 break; 439 440 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) { 441 /* hit from bridge table, send LE_ARP_RESPONSE */ 442 struct sk_buff *skb2; 443 struct sock *sk; 444 445 pr_debug("%s: entry found, responding to zeppelin\n", 446 dev->name); 447 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 448 if (skb2 == NULL) 449 break; 450 skb2->len = sizeof(struct atmlec_msg); 451 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg)); 452 atm_force_charge(priv->lecd, skb2->truesize); 453 sk = sk_atm(priv->lecd); 454 skb_queue_tail(&sk->sk_receive_queue, skb2); 455 sk->sk_data_ready(sk); 456 } 457 } 458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */ 459 break; 460 default: 461 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type); 462 dev_kfree_skb(skb); 463 return -EINVAL; 464 } 465 dev_kfree_skb(skb); 466 return 0; 467 } 468 469 static void lec_atm_close(struct atm_vcc *vcc) 470 { 471 struct sk_buff *skb; 472 struct net_device *dev = (struct net_device *)vcc->proto_data; 473 struct lec_priv *priv = netdev_priv(dev); 474 475 priv->lecd = NULL; 476 /* Do something needful? */ 477 478 netif_stop_queue(dev); 479 lec_arp_destroy(priv); 480 481 if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) 482 pr_info("%s closing with messages pending\n", dev->name); 483 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 484 atm_return(vcc, skb->truesize); 485 dev_kfree_skb(skb); 486 } 487 488 pr_info("%s: Shut down!\n", dev->name); 489 module_put(THIS_MODULE); 490 } 491 492 static const struct atmdev_ops lecdev_ops = { 493 .close = lec_atm_close, 494 .send = lec_atm_send 495 }; 496 497 static struct atm_dev lecatm_dev = { 498 .ops = &lecdev_ops, 499 .type = "lec", 500 .number = 999, /* dummy device number */ 501 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock) 502 }; 503 504 /* 505 * LANE2: new argument struct sk_buff *data contains 506 * the LE_ARP based TLVs introduced in the LANE2 spec 507 */ 508 static int 509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 510 const unsigned char *mac_addr, const unsigned char *atm_addr, 511 struct sk_buff *data) 512 { 513 struct sock *sk; 514 struct sk_buff *skb; 515 struct atmlec_msg *mesg; 516 517 if (!priv || !priv->lecd) 518 return -1; 519 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); 520 if (!skb) 521 return -1; 522 skb->len = sizeof(struct atmlec_msg); 523 mesg = (struct atmlec_msg *)skb->data; 524 memset(mesg, 0, sizeof(struct atmlec_msg)); 525 mesg->type = type; 526 if (data != NULL) 527 mesg->sizeoftlvs = data->len; 528 if (mac_addr) 529 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr); 530 else 531 mesg->content.normal.targetless_le_arp = 1; 532 if (atm_addr) 533 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); 534 535 atm_force_charge(priv->lecd, skb->truesize); 536 sk = sk_atm(priv->lecd); 537 skb_queue_tail(&sk->sk_receive_queue, skb); 538 sk->sk_data_ready(sk); 539 540 if (data != NULL) { 541 pr_debug("about to send %d bytes of data\n", data->len); 542 atm_force_charge(priv->lecd, data->truesize); 543 skb_queue_tail(&sk->sk_receive_queue, data); 544 sk->sk_data_ready(sk); 545 } 546 547 return 0; 548 } 549 550 static void lec_set_multicast_list(struct net_device *dev) 551 { 552 /* 553 * by default, all multicast frames arrive over the bus. 554 * eventually support selective multicast service 555 */ 556 } 557 558 static const struct net_device_ops lec_netdev_ops = { 559 .ndo_open = lec_open, 560 .ndo_stop = lec_close, 561 .ndo_start_xmit = lec_start_xmit, 562 .ndo_tx_timeout = lec_tx_timeout, 563 .ndo_set_rx_mode = lec_set_multicast_list, 564 }; 565 566 static const unsigned char lec_ctrl_magic[] = { 567 0xff, 568 0x00, 569 0x01, 570 0x01 571 }; 572 573 #define LEC_DATA_DIRECT_8023 2 574 #define LEC_DATA_DIRECT_8025 3 575 576 static int lec_is_data_direct(struct atm_vcc *vcc) 577 { 578 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) || 579 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025)); 580 } 581 582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb) 583 { 584 unsigned long flags; 585 struct net_device *dev = (struct net_device *)vcc->proto_data; 586 struct lec_priv *priv = netdev_priv(dev); 587 588 #if DUMP_PACKETS > 0 589 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n", 590 dev->name, vcc->vpi, vcc->vci); 591 #endif 592 if (!skb) { 593 pr_debug("%s: null skb\n", dev->name); 594 lec_vcc_close(priv, vcc); 595 return; 596 } 597 #if DUMP_PACKETS >= 2 598 #define MAX_SKB_DUMP 99 599 #elif DUMP_PACKETS >= 1 600 #define MAX_SKB_DUMP 30 601 #endif 602 #if DUMP_PACKETS > 0 603 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n", 604 dev->name, skb->len, priv->lecid); 605 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1, 606 skb->data, min(MAX_SKB_DUMP, skb->len), true); 607 #endif /* DUMP_PACKETS > 0 */ 608 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { 609 /* Control frame, to daemon */ 610 struct sock *sk = sk_atm(vcc); 611 612 pr_debug("%s: To daemon\n", dev->name); 613 skb_queue_tail(&sk->sk_receive_queue, skb); 614 sk->sk_data_ready(sk); 615 } else { /* Data frame, queue to protocol handlers */ 616 struct lec_arp_table *entry; 617 unsigned char *src, *dst; 618 619 atm_return(vcc, skb->truesize); 620 if (*(__be16 *) skb->data == htons(priv->lecid) || 621 !priv->lecd || !(dev->flags & IFF_UP)) { 622 /* 623 * Probably looping back, or if lecd is missing, 624 * lecd has gone down 625 */ 626 pr_debug("Ignoring frame...\n"); 627 dev_kfree_skb(skb); 628 return; 629 } 630 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; 631 632 /* 633 * If this is a Data Direct VCC, and the VCC does not match 634 * the LE_ARP cache entry, delete the LE_ARP cache entry. 635 */ 636 spin_lock_irqsave(&priv->lec_arp_lock, flags); 637 if (lec_is_data_direct(vcc)) { 638 src = ((struct lecdatahdr_8023 *)skb->data)->h_source; 639 entry = lec_arp_find(priv, src); 640 if (entry && entry->vcc != vcc) { 641 lec_arp_remove(priv, entry); 642 lec_arp_put(entry); 643 } 644 } 645 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 646 647 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */ 648 !priv->is_proxy && /* Proxy wants all the packets */ 649 memcmp(dst, dev->dev_addr, dev->addr_len)) { 650 dev_kfree_skb(skb); 651 return; 652 } 653 if (!hlist_empty(&priv->lec_arp_empty_ones)) 654 lec_arp_check_empties(priv, vcc, skb); 655 skb_pull(skb, 2); /* skip lec_id */ 656 skb->protocol = eth_type_trans(skb, dev); 657 dev->stats.rx_packets++; 658 dev->stats.rx_bytes += skb->len; 659 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 660 netif_rx(skb); 661 } 662 } 663 664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) 665 { 666 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 667 struct net_device *dev = skb->dev; 668 669 if (vpriv == NULL) { 670 pr_info("vpriv = NULL!?!?!?\n"); 671 return; 672 } 673 674 vpriv->old_pop(vcc, skb); 675 676 if (vpriv->xoff && atm_may_send(vcc, 0)) { 677 vpriv->xoff = 0; 678 if (netif_running(dev) && netif_queue_stopped(dev)) 679 netif_wake_queue(dev); 680 } 681 } 682 683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) 684 { 685 struct lec_vcc_priv *vpriv; 686 int bytes_left; 687 struct atmlec_ioc ioc_data; 688 689 /* Lecd must be up in this case */ 690 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); 691 if (bytes_left != 0) 692 pr_info("copy from user failed for %d bytes\n", bytes_left); 693 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 694 return -EINVAL; 695 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF); 696 if (!dev_lec[ioc_data.dev_num]) 697 return -EINVAL; 698 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 699 if (!vpriv) 700 return -ENOMEM; 701 vpriv->xoff = 0; 702 vpriv->old_pop = vcc->pop; 703 vcc->user_back = vpriv; 704 vcc->pop = lec_pop; 705 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]), 706 &ioc_data, vcc, vcc->push); 707 vcc->proto_data = dev_lec[ioc_data.dev_num]; 708 vcc->push = lec_push; 709 return 0; 710 } 711 712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg) 713 { 714 if (arg < 0 || arg >= MAX_LEC_ITF) 715 return -EINVAL; 716 arg = array_index_nospec(arg, MAX_LEC_ITF); 717 if (!dev_lec[arg]) 718 return -EINVAL; 719 vcc->proto_data = dev_lec[arg]; 720 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc); 721 } 722 723 /* Initialize device. */ 724 static int lecd_attach(struct atm_vcc *vcc, int arg) 725 { 726 int i; 727 struct lec_priv *priv; 728 729 if (arg < 0) 730 arg = 0; 731 if (arg >= MAX_LEC_ITF) 732 return -EINVAL; 733 i = array_index_nospec(arg, MAX_LEC_ITF); 734 if (!dev_lec[i]) { 735 int size; 736 737 size = sizeof(struct lec_priv); 738 dev_lec[i] = alloc_etherdev(size); 739 if (!dev_lec[i]) 740 return -ENOMEM; 741 dev_lec[i]->netdev_ops = &lec_netdev_ops; 742 dev_lec[i]->max_mtu = 18190; 743 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); 744 if (register_netdev(dev_lec[i])) { 745 free_netdev(dev_lec[i]); 746 return -EINVAL; 747 } 748 749 priv = netdev_priv(dev_lec[i]); 750 } else { 751 priv = netdev_priv(dev_lec[i]); 752 if (priv->lecd) 753 return -EADDRINUSE; 754 } 755 lec_arp_init(priv); 756 priv->itfnum = i; /* LANE2 addition */ 757 priv->lecd = vcc; 758 vcc->dev = &lecatm_dev; 759 vcc_insert_socket(sk_atm(vcc)); 760 761 vcc->proto_data = dev_lec[i]; 762 set_bit(ATM_VF_META, &vcc->flags); 763 set_bit(ATM_VF_READY, &vcc->flags); 764 765 /* Set default values to these variables */ 766 priv->maximum_unknown_frame_count = 1; 767 priv->max_unknown_frame_time = (1 * HZ); 768 priv->vcc_timeout_period = (1200 * HZ); 769 priv->max_retry_count = 1; 770 priv->aging_time = (300 * HZ); 771 priv->forward_delay_time = (15 * HZ); 772 priv->topology_change = 0; 773 priv->arp_response_time = (1 * HZ); 774 priv->flush_timeout = (4 * HZ); 775 priv->path_switching_delay = (6 * HZ); 776 777 if (dev_lec[i]->flags & IFF_UP) 778 netif_start_queue(dev_lec[i]); 779 __module_get(THIS_MODULE); 780 return i; 781 } 782 783 #ifdef CONFIG_PROC_FS 784 static const char *lec_arp_get_status_string(unsigned char status) 785 { 786 static const char *const lec_arp_status_string[] = { 787 "ESI_UNKNOWN ", 788 "ESI_ARP_PENDING ", 789 "ESI_VC_PENDING ", 790 "<Undefined> ", 791 "ESI_FLUSH_PENDING ", 792 "ESI_FORWARD_DIRECT" 793 }; 794 795 if (status > ESI_FORWARD_DIRECT) 796 status = 3; /* ESI_UNDEFINED */ 797 return lec_arp_status_string[status]; 798 } 799 800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) 801 { 802 seq_printf(seq, "%pM ", entry->mac_addr); 803 seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr); 804 seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status), 805 entry->flags & 0xffff); 806 if (entry->vcc) 807 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 808 else 809 seq_printf(seq, " "); 810 if (entry->recv_vcc) { 811 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 812 entry->recv_vcc->vci); 813 } 814 seq_putc(seq, '\n'); 815 } 816 817 struct lec_state { 818 unsigned long flags; 819 struct lec_priv *locked; 820 struct hlist_node *node; 821 struct net_device *dev; 822 int itf; 823 int arp_table; 824 int misc_table; 825 }; 826 827 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 828 loff_t *l) 829 { 830 struct hlist_node *e = state->node; 831 832 if (!e) 833 e = tbl->first; 834 if (e == SEQ_START_TOKEN) { 835 e = tbl->first; 836 --*l; 837 } 838 839 for (; e; e = e->next) { 840 if (--*l < 0) 841 break; 842 } 843 state->node = e; 844 845 return (*l < 0) ? state : NULL; 846 } 847 848 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 849 struct lec_priv *priv) 850 { 851 void *v = NULL; 852 int p; 853 854 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 855 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 856 if (v) 857 break; 858 } 859 state->arp_table = p; 860 return v; 861 } 862 863 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 864 struct lec_priv *priv) 865 { 866 struct hlist_head *lec_misc_tables[] = { 867 &priv->lec_arp_empty_ones, 868 &priv->lec_no_forward, 869 &priv->mcast_fwds 870 }; 871 void *v = NULL; 872 int q; 873 874 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 875 v = lec_tbl_walk(state, lec_misc_tables[q], l); 876 if (v) 877 break; 878 } 879 state->misc_table = q; 880 return v; 881 } 882 883 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 884 struct lec_priv *priv) 885 { 886 if (!state->locked) { 887 state->locked = priv; 888 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 889 } 890 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 891 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 892 state->locked = NULL; 893 /* Partial state reset for the next time we get called */ 894 state->arp_table = state->misc_table = 0; 895 } 896 return state->locked; 897 } 898 899 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 900 { 901 struct net_device *dev; 902 void *v; 903 904 dev = state->dev ? state->dev : dev_lec[state->itf]; 905 v = (dev && netdev_priv(dev)) ? 906 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 907 if (!v && dev) { 908 dev_put(dev); 909 /* Partial state reset for the next time we get called */ 910 dev = NULL; 911 } 912 state->dev = dev; 913 return v; 914 } 915 916 static void *lec_get_idx(struct lec_state *state, loff_t l) 917 { 918 void *v = NULL; 919 920 for (; state->itf < MAX_LEC_ITF; state->itf++) { 921 v = lec_itf_walk(state, &l); 922 if (v) 923 break; 924 } 925 return v; 926 } 927 928 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 929 { 930 struct lec_state *state = seq->private; 931 932 state->itf = 0; 933 state->dev = NULL; 934 state->locked = NULL; 935 state->arp_table = 0; 936 state->misc_table = 0; 937 state->node = SEQ_START_TOKEN; 938 939 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 940 } 941 942 static void lec_seq_stop(struct seq_file *seq, void *v) 943 { 944 struct lec_state *state = seq->private; 945 946 if (state->dev) { 947 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 948 state->flags); 949 dev_put(state->dev); 950 } 951 } 952 953 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 954 { 955 struct lec_state *state = seq->private; 956 957 v = lec_get_idx(state, 1); 958 *pos += !!PTR_ERR(v); 959 return v; 960 } 961 962 static int lec_seq_show(struct seq_file *seq, void *v) 963 { 964 static const char lec_banner[] = 965 "Itf MAC ATM destination" 966 " Status Flags " 967 "VPI/VCI Recv VPI/VCI\n"; 968 969 if (v == SEQ_START_TOKEN) 970 seq_puts(seq, lec_banner); 971 else { 972 struct lec_state *state = seq->private; 973 struct net_device *dev = state->dev; 974 struct lec_arp_table *entry = hlist_entry(state->node, 975 struct lec_arp_table, 976 next); 977 978 seq_printf(seq, "%s ", dev->name); 979 lec_info(seq, entry); 980 } 981 return 0; 982 } 983 984 static const struct seq_operations lec_seq_ops = { 985 .start = lec_seq_start, 986 .next = lec_seq_next, 987 .stop = lec_seq_stop, 988 .show = lec_seq_show, 989 }; 990 #endif 991 992 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 993 { 994 struct atm_vcc *vcc = ATM_SD(sock); 995 int err = 0; 996 997 switch (cmd) { 998 case ATMLEC_CTRL: 999 case ATMLEC_MCAST: 1000 case ATMLEC_DATA: 1001 if (!capable(CAP_NET_ADMIN)) 1002 return -EPERM; 1003 break; 1004 default: 1005 return -ENOIOCTLCMD; 1006 } 1007 1008 switch (cmd) { 1009 case ATMLEC_CTRL: 1010 err = lecd_attach(vcc, (int)arg); 1011 if (err >= 0) 1012 sock->state = SS_CONNECTED; 1013 break; 1014 case ATMLEC_MCAST: 1015 err = lec_mcast_attach(vcc, (int)arg); 1016 break; 1017 case ATMLEC_DATA: 1018 err = lec_vcc_attach(vcc, (void __user *)arg); 1019 break; 1020 } 1021 1022 return err; 1023 } 1024 1025 static struct atm_ioctl lane_ioctl_ops = { 1026 .owner = THIS_MODULE, 1027 .ioctl = lane_ioctl, 1028 }; 1029 1030 static int __init lane_module_init(void) 1031 { 1032 #ifdef CONFIG_PROC_FS 1033 struct proc_dir_entry *p; 1034 1035 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops, 1036 sizeof(struct lec_state), NULL); 1037 if (!p) { 1038 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1039 return -ENOMEM; 1040 } 1041 #endif 1042 1043 register_atm_ioctl(&lane_ioctl_ops); 1044 pr_info("lec.c: initialized\n"); 1045 return 0; 1046 } 1047 1048 static void __exit lane_module_cleanup(void) 1049 { 1050 int i; 1051 1052 #ifdef CONFIG_PROC_FS 1053 remove_proc_entry("lec", atm_proc_root); 1054 #endif 1055 1056 deregister_atm_ioctl(&lane_ioctl_ops); 1057 1058 for (i = 0; i < MAX_LEC_ITF; i++) { 1059 if (dev_lec[i] != NULL) { 1060 unregister_netdev(dev_lec[i]); 1061 free_netdev(dev_lec[i]); 1062 dev_lec[i] = NULL; 1063 } 1064 } 1065 } 1066 1067 module_init(lane_module_init); 1068 module_exit(lane_module_cleanup); 1069 1070 /* 1071 * LANE2: 3.1.3, LE_RESOLVE.request 1072 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1073 * If sizeoftlvs == NULL the default TLVs associated with with this 1074 * lec will be used. 1075 * If dst_mac == NULL, targetless LE_ARP will be sent 1076 */ 1077 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1078 u8 **tlvs, u32 *sizeoftlvs) 1079 { 1080 unsigned long flags; 1081 struct lec_priv *priv = netdev_priv(dev); 1082 struct lec_arp_table *table; 1083 struct sk_buff *skb; 1084 int retval; 1085 1086 if (force == 0) { 1087 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1088 table = lec_arp_find(priv, dst_mac); 1089 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1090 if (table == NULL) 1091 return -1; 1092 1093 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1094 if (*tlvs == NULL) 1095 return -1; 1096 1097 *sizeoftlvs = table->sizeoftlvs; 1098 1099 return 0; 1100 } 1101 1102 if (sizeoftlvs == NULL) 1103 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1104 1105 else { 1106 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1107 if (skb == NULL) 1108 return -1; 1109 skb->len = *sizeoftlvs; 1110 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1111 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1112 } 1113 return retval; 1114 } 1115 1116 /* 1117 * LANE2: 3.1.4, LE_ASSOCIATE.request 1118 * Associate the *tlvs with the *lan_dst address. 1119 * Will overwrite any previous association 1120 * Returns 1 for success, 0 for failure (out of memory) 1121 * 1122 */ 1123 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1124 const u8 *tlvs, u32 sizeoftlvs) 1125 { 1126 int retval; 1127 struct sk_buff *skb; 1128 struct lec_priv *priv = netdev_priv(dev); 1129 1130 if (!ether_addr_equal(lan_dst, dev->dev_addr)) 1131 return 0; /* not our mac address */ 1132 1133 kfree(priv->tlvs); /* NULL if there was no previous association */ 1134 1135 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1136 if (priv->tlvs == NULL) 1137 return 0; 1138 priv->sizeoftlvs = sizeoftlvs; 1139 1140 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1141 if (skb == NULL) 1142 return 0; 1143 skb->len = sizeoftlvs; 1144 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1145 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1146 if (retval != 0) 1147 pr_info("lec.c: lane2_associate_req() failed\n"); 1148 /* 1149 * If the previous association has changed we must 1150 * somehow notify other LANE entities about the change 1151 */ 1152 return 1; 1153 } 1154 1155 /* 1156 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1157 * 1158 */ 1159 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1160 const u8 *tlvs, u32 sizeoftlvs) 1161 { 1162 #if 0 1163 int i = 0; 1164 #endif 1165 struct lec_priv *priv = netdev_priv(dev); 1166 #if 0 /* 1167 * Why have the TLVs in LE_ARP entries 1168 * since we do not use them? When you 1169 * uncomment this code, make sure the 1170 * TLVs get freed when entry is killed 1171 */ 1172 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1173 1174 if (entry == NULL) 1175 return; /* should not happen */ 1176 1177 kfree(entry->tlvs); 1178 1179 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1180 if (entry->tlvs == NULL) 1181 return; 1182 entry->sizeoftlvs = sizeoftlvs; 1183 #endif 1184 #if 0 1185 pr_info("\n"); 1186 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1187 while (i < sizeoftlvs) 1188 pr_cont("%02x ", tlvs[i++]); 1189 1190 pr_cont("\n"); 1191 #endif 1192 1193 /* tell MPOA about the TLVs we saw */ 1194 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1195 priv->lane2_ops->associate_indicator(dev, mac_addr, 1196 tlvs, sizeoftlvs); 1197 } 1198 } 1199 1200 /* 1201 * Here starts what used to lec_arpc.c 1202 * 1203 * lec_arpc.c was added here when making 1204 * lane client modular. October 1997 1205 */ 1206 1207 #include <linux/types.h> 1208 #include <linux/timer.h> 1209 #include <linux/param.h> 1210 #include <linux/atomic.h> 1211 #include <linux/inetdevice.h> 1212 #include <net/route.h> 1213 1214 #if 0 1215 #define pr_debug(format, args...) 1216 /* 1217 #define pr_debug printk 1218 */ 1219 #endif 1220 #define DEBUG_ARP_TABLE 0 1221 1222 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1223 1224 static void lec_arp_check_expire(struct work_struct *work); 1225 static void lec_arp_expire_arp(struct timer_list *t); 1226 1227 /* 1228 * Arp table funcs 1229 */ 1230 1231 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1232 1233 /* 1234 * Initialization of arp-cache 1235 */ 1236 static void lec_arp_init(struct lec_priv *priv) 1237 { 1238 unsigned short i; 1239 1240 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1241 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1242 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1243 INIT_HLIST_HEAD(&priv->lec_no_forward); 1244 INIT_HLIST_HEAD(&priv->mcast_fwds); 1245 spin_lock_init(&priv->lec_arp_lock); 1246 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1247 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1248 } 1249 1250 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1251 { 1252 if (entry->vcc) { 1253 struct atm_vcc *vcc = entry->vcc; 1254 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1255 struct net_device *dev = (struct net_device *)vcc->proto_data; 1256 1257 vcc->pop = vpriv->old_pop; 1258 if (vpriv->xoff) 1259 netif_wake_queue(dev); 1260 kfree(vpriv); 1261 vcc->user_back = NULL; 1262 vcc->push = entry->old_push; 1263 vcc_release_async(vcc, -EPIPE); 1264 entry->vcc = NULL; 1265 } 1266 if (entry->recv_vcc) { 1267 struct atm_vcc *vcc = entry->recv_vcc; 1268 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1269 1270 kfree(vpriv); 1271 vcc->user_back = NULL; 1272 1273 entry->recv_vcc->push = entry->old_recv_push; 1274 vcc_release_async(entry->recv_vcc, -EPIPE); 1275 entry->recv_vcc = NULL; 1276 } 1277 } 1278 1279 /* 1280 * Insert entry to lec_arp_table 1281 * LANE2: Add to the end of the list to satisfy 8.1.13 1282 */ 1283 static inline void 1284 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1285 { 1286 struct hlist_head *tmp; 1287 1288 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1289 hlist_add_head(&entry->next, tmp); 1290 1291 pr_debug("Added entry:%pM\n", entry->mac_addr); 1292 } 1293 1294 /* 1295 * Remove entry from lec_arp_table 1296 */ 1297 static int 1298 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1299 { 1300 struct lec_arp_table *entry; 1301 int i, remove_vcc = 1; 1302 1303 if (!to_remove) 1304 return -1; 1305 1306 hlist_del(&to_remove->next); 1307 del_timer(&to_remove->timer); 1308 1309 /* 1310 * If this is the only MAC connected to this VCC, 1311 * also tear down the VCC 1312 */ 1313 if (to_remove->status >= ESI_FLUSH_PENDING) { 1314 /* 1315 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1316 */ 1317 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1318 hlist_for_each_entry(entry, 1319 &priv->lec_arp_tables[i], next) { 1320 if (memcmp(to_remove->atm_addr, 1321 entry->atm_addr, ATM_ESA_LEN) == 0) { 1322 remove_vcc = 0; 1323 break; 1324 } 1325 } 1326 } 1327 if (remove_vcc) 1328 lec_arp_clear_vccs(to_remove); 1329 } 1330 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1331 1332 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1333 return 0; 1334 } 1335 1336 #if DEBUG_ARP_TABLE 1337 static const char *get_status_string(unsigned char st) 1338 { 1339 switch (st) { 1340 case ESI_UNKNOWN: 1341 return "ESI_UNKNOWN"; 1342 case ESI_ARP_PENDING: 1343 return "ESI_ARP_PENDING"; 1344 case ESI_VC_PENDING: 1345 return "ESI_VC_PENDING"; 1346 case ESI_FLUSH_PENDING: 1347 return "ESI_FLUSH_PENDING"; 1348 case ESI_FORWARD_DIRECT: 1349 return "ESI_FORWARD_DIRECT"; 1350 } 1351 return "<UNKNOWN>"; 1352 } 1353 1354 static void dump_arp_table(struct lec_priv *priv) 1355 { 1356 struct lec_arp_table *rulla; 1357 char buf[256]; 1358 int i, offset; 1359 1360 pr_info("Dump %p:\n", priv); 1361 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1362 hlist_for_each_entry(rulla, 1363 &priv->lec_arp_tables[i], next) { 1364 offset = 0; 1365 offset += sprintf(buf, "%d: %p\n", i, rulla); 1366 offset += sprintf(buf + offset, "Mac: %pM ", 1367 rulla->mac_addr); 1368 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1369 rulla->atm_addr); 1370 offset += sprintf(buf + offset, 1371 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1372 rulla->vcc ? rulla->vcc->vpi : 0, 1373 rulla->vcc ? rulla->vcc->vci : 0, 1374 rulla->recv_vcc ? rulla->recv_vcc-> 1375 vpi : 0, 1376 rulla->recv_vcc ? rulla->recv_vcc-> 1377 vci : 0, rulla->last_used, 1378 rulla->timestamp, rulla->no_tries); 1379 offset += 1380 sprintf(buf + offset, 1381 "Flags:%x, Packets_flooded:%x, Status: %s ", 1382 rulla->flags, rulla->packets_flooded, 1383 get_status_string(rulla->status)); 1384 pr_info("%s\n", buf); 1385 } 1386 } 1387 1388 if (!hlist_empty(&priv->lec_no_forward)) 1389 pr_info("No forward\n"); 1390 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) { 1391 offset = 0; 1392 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1393 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1394 rulla->atm_addr); 1395 offset += sprintf(buf + offset, 1396 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1397 rulla->vcc ? rulla->vcc->vpi : 0, 1398 rulla->vcc ? rulla->vcc->vci : 0, 1399 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1400 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1401 rulla->last_used, 1402 rulla->timestamp, rulla->no_tries); 1403 offset += sprintf(buf + offset, 1404 "Flags:%x, Packets_flooded:%x, Status: %s ", 1405 rulla->flags, rulla->packets_flooded, 1406 get_status_string(rulla->status)); 1407 pr_info("%s\n", buf); 1408 } 1409 1410 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1411 pr_info("Empty ones\n"); 1412 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) { 1413 offset = 0; 1414 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1415 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1416 rulla->atm_addr); 1417 offset += sprintf(buf + offset, 1418 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1419 rulla->vcc ? rulla->vcc->vpi : 0, 1420 rulla->vcc ? rulla->vcc->vci : 0, 1421 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1422 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1423 rulla->last_used, 1424 rulla->timestamp, rulla->no_tries); 1425 offset += sprintf(buf + offset, 1426 "Flags:%x, Packets_flooded:%x, Status: %s ", 1427 rulla->flags, rulla->packets_flooded, 1428 get_status_string(rulla->status)); 1429 pr_info("%s", buf); 1430 } 1431 1432 if (!hlist_empty(&priv->mcast_fwds)) 1433 pr_info("Multicast Forward VCCs\n"); 1434 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) { 1435 offset = 0; 1436 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr); 1437 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN, 1438 rulla->atm_addr); 1439 offset += sprintf(buf + offset, 1440 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1441 rulla->vcc ? rulla->vcc->vpi : 0, 1442 rulla->vcc ? rulla->vcc->vci : 0, 1443 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1444 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1445 rulla->last_used, 1446 rulla->timestamp, rulla->no_tries); 1447 offset += sprintf(buf + offset, 1448 "Flags:%x, Packets_flooded:%x, Status: %s ", 1449 rulla->flags, rulla->packets_flooded, 1450 get_status_string(rulla->status)); 1451 pr_info("%s\n", buf); 1452 } 1453 1454 } 1455 #else 1456 #define dump_arp_table(priv) do { } while (0) 1457 #endif 1458 1459 /* 1460 * Destruction of arp-cache 1461 */ 1462 static void lec_arp_destroy(struct lec_priv *priv) 1463 { 1464 unsigned long flags; 1465 struct hlist_node *next; 1466 struct lec_arp_table *entry; 1467 int i; 1468 1469 cancel_delayed_work_sync(&priv->lec_arp_work); 1470 1471 /* 1472 * Remove all entries 1473 */ 1474 1475 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1476 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1477 hlist_for_each_entry_safe(entry, next, 1478 &priv->lec_arp_tables[i], next) { 1479 lec_arp_remove(priv, entry); 1480 lec_arp_put(entry); 1481 } 1482 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1483 } 1484 1485 hlist_for_each_entry_safe(entry, next, 1486 &priv->lec_arp_empty_ones, next) { 1487 del_timer_sync(&entry->timer); 1488 lec_arp_clear_vccs(entry); 1489 hlist_del(&entry->next); 1490 lec_arp_put(entry); 1491 } 1492 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1493 1494 hlist_for_each_entry_safe(entry, next, 1495 &priv->lec_no_forward, next) { 1496 del_timer_sync(&entry->timer); 1497 lec_arp_clear_vccs(entry); 1498 hlist_del(&entry->next); 1499 lec_arp_put(entry); 1500 } 1501 INIT_HLIST_HEAD(&priv->lec_no_forward); 1502 1503 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 1504 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1505 lec_arp_clear_vccs(entry); 1506 hlist_del(&entry->next); 1507 lec_arp_put(entry); 1508 } 1509 INIT_HLIST_HEAD(&priv->mcast_fwds); 1510 priv->mcast_vcc = NULL; 1511 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1512 } 1513 1514 /* 1515 * Find entry by mac_address 1516 */ 1517 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1518 const unsigned char *mac_addr) 1519 { 1520 struct hlist_head *head; 1521 struct lec_arp_table *entry; 1522 1523 pr_debug("%pM\n", mac_addr); 1524 1525 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1526 hlist_for_each_entry(entry, head, next) { 1527 if (ether_addr_equal(mac_addr, entry->mac_addr)) 1528 return entry; 1529 } 1530 return NULL; 1531 } 1532 1533 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1534 const unsigned char *mac_addr) 1535 { 1536 struct lec_arp_table *to_return; 1537 1538 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1539 if (!to_return) 1540 return NULL; 1541 ether_addr_copy(to_return->mac_addr, mac_addr); 1542 INIT_HLIST_NODE(&to_return->next); 1543 timer_setup(&to_return->timer, lec_arp_expire_arp, 0); 1544 to_return->last_used = jiffies; 1545 to_return->priv = priv; 1546 skb_queue_head_init(&to_return->tx_wait); 1547 refcount_set(&to_return->usage, 1); 1548 return to_return; 1549 } 1550 1551 /* Arp sent timer expired */ 1552 static void lec_arp_expire_arp(struct timer_list *t) 1553 { 1554 struct lec_arp_table *entry; 1555 1556 entry = from_timer(entry, t, timer); 1557 1558 pr_debug("\n"); 1559 if (entry->status == ESI_ARP_PENDING) { 1560 if (entry->no_tries <= entry->priv->max_retry_count) { 1561 if (entry->is_rdesc) 1562 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1563 entry->mac_addr, NULL, NULL); 1564 else 1565 send_to_lecd(entry->priv, l_arp_xmt, 1566 entry->mac_addr, NULL, NULL); 1567 entry->no_tries++; 1568 } 1569 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1570 } 1571 } 1572 1573 /* Unknown/unused vcc expire, remove associated entry */ 1574 static void lec_arp_expire_vcc(struct timer_list *t) 1575 { 1576 unsigned long flags; 1577 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer); 1578 struct lec_priv *priv = to_remove->priv; 1579 1580 del_timer(&to_remove->timer); 1581 1582 pr_debug("%p %p: vpi:%d vci:%d\n", 1583 to_remove, priv, 1584 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1585 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1586 1587 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1588 hlist_del(&to_remove->next); 1589 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1590 1591 lec_arp_clear_vccs(to_remove); 1592 lec_arp_put(to_remove); 1593 } 1594 1595 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1596 unsigned long now, 1597 struct lec_priv *priv) 1598 { 1599 unsigned long time_to_check; 1600 1601 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1602 time_to_check = priv->forward_delay_time; 1603 else 1604 time_to_check = priv->aging_time; 1605 1606 pr_debug("About to expire: %lx - %lx > %lx\n", 1607 now, entry->last_used, time_to_check); 1608 if (time_after(now, entry->last_used + time_to_check) && 1609 !(entry->flags & LEC_PERMANENT_FLAG) && 1610 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1611 /* Remove entry */ 1612 pr_debug("Entry timed out\n"); 1613 lec_arp_remove(priv, entry); 1614 lec_arp_put(entry); 1615 } else { 1616 /* Something else */ 1617 if ((entry->status == ESI_VC_PENDING || 1618 entry->status == ESI_ARP_PENDING) && 1619 time_after_eq(now, entry->timestamp + 1620 priv->max_unknown_frame_time)) { 1621 entry->timestamp = jiffies; 1622 entry->packets_flooded = 0; 1623 if (entry->status == ESI_VC_PENDING) 1624 send_to_lecd(priv, l_svc_setup, 1625 entry->mac_addr, 1626 entry->atm_addr, 1627 NULL); 1628 } 1629 if (entry->status == ESI_FLUSH_PENDING && 1630 time_after_eq(now, entry->timestamp + 1631 priv->path_switching_delay)) { 1632 lec_arp_hold(entry); 1633 return true; 1634 } 1635 } 1636 1637 return false; 1638 } 1639 /* 1640 * Expire entries. 1641 * 1. Re-set timer 1642 * 2. For each entry, delete entries that have aged past the age limit. 1643 * 3. For each entry, depending on the status of the entry, perform 1644 * the following maintenance. 1645 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1646 * tick_count is above the max_unknown_frame_time, clear 1647 * the tick_count to zero and clear the packets_flooded counter 1648 * to zero. This supports the packet rate limit per address 1649 * while flooding unknowns. 1650 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1651 * than or equal to the path_switching_delay, change the status 1652 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1653 * regardless of the progress of the flush protocol. 1654 */ 1655 static void lec_arp_check_expire(struct work_struct *work) 1656 { 1657 unsigned long flags; 1658 struct lec_priv *priv = 1659 container_of(work, struct lec_priv, lec_arp_work.work); 1660 struct hlist_node *next; 1661 struct lec_arp_table *entry; 1662 unsigned long now; 1663 int i; 1664 1665 pr_debug("%p\n", priv); 1666 now = jiffies; 1667 restart: 1668 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1669 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1670 hlist_for_each_entry_safe(entry, next, 1671 &priv->lec_arp_tables[i], next) { 1672 if (__lec_arp_check_expire(entry, now, priv)) { 1673 struct sk_buff *skb; 1674 struct atm_vcc *vcc = entry->vcc; 1675 1676 spin_unlock_irqrestore(&priv->lec_arp_lock, 1677 flags); 1678 while ((skb = skb_dequeue(&entry->tx_wait))) 1679 lec_send(vcc, skb); 1680 entry->last_used = jiffies; 1681 entry->status = ESI_FORWARD_DIRECT; 1682 lec_arp_put(entry); 1683 1684 goto restart; 1685 } 1686 } 1687 } 1688 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1689 1690 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1691 } 1692 1693 /* 1694 * Try to find vcc where mac_address is attached. 1695 * 1696 */ 1697 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1698 const unsigned char *mac_to_find, 1699 int is_rdesc, 1700 struct lec_arp_table **ret_entry) 1701 { 1702 unsigned long flags; 1703 struct lec_arp_table *entry; 1704 struct atm_vcc *found; 1705 1706 if (mac_to_find[0] & 0x01) { 1707 switch (priv->lane_version) { 1708 case 1: 1709 return priv->mcast_vcc; 1710 case 2: /* LANE2 wants arp for multicast addresses */ 1711 if (ether_addr_equal(mac_to_find, bus_mac)) 1712 return priv->mcast_vcc; 1713 break; 1714 default: 1715 break; 1716 } 1717 } 1718 1719 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1720 entry = lec_arp_find(priv, mac_to_find); 1721 1722 if (entry) { 1723 if (entry->status == ESI_FORWARD_DIRECT) { 1724 /* Connection Ok */ 1725 entry->last_used = jiffies; 1726 lec_arp_hold(entry); 1727 *ret_entry = entry; 1728 found = entry->vcc; 1729 goto out; 1730 } 1731 /* 1732 * If the LE_ARP cache entry is still pending, reset count to 0 1733 * so another LE_ARP request can be made for this frame. 1734 */ 1735 if (entry->status == ESI_ARP_PENDING) 1736 entry->no_tries = 0; 1737 /* 1738 * Data direct VC not yet set up, check to see if the unknown 1739 * frame count is greater than the limit. If the limit has 1740 * not been reached, allow the caller to send packet to 1741 * BUS. 1742 */ 1743 if (entry->status != ESI_FLUSH_PENDING && 1744 entry->packets_flooded < 1745 priv->maximum_unknown_frame_count) { 1746 entry->packets_flooded++; 1747 pr_debug("Flooding..\n"); 1748 found = priv->mcast_vcc; 1749 goto out; 1750 } 1751 /* 1752 * We got here because entry->status == ESI_FLUSH_PENDING 1753 * or BUS flood limit was reached for an entry which is 1754 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1755 */ 1756 lec_arp_hold(entry); 1757 *ret_entry = entry; 1758 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1759 entry->vcc); 1760 found = NULL; 1761 } else { 1762 /* No matching entry was found */ 1763 entry = make_entry(priv, mac_to_find); 1764 pr_debug("Making entry\n"); 1765 if (!entry) { 1766 found = priv->mcast_vcc; 1767 goto out; 1768 } 1769 lec_arp_add(priv, entry); 1770 /* We want arp-request(s) to be sent */ 1771 entry->packets_flooded = 1; 1772 entry->status = ESI_ARP_PENDING; 1773 entry->no_tries = 1; 1774 entry->last_used = entry->timestamp = jiffies; 1775 entry->is_rdesc = is_rdesc; 1776 if (entry->is_rdesc) 1777 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1778 NULL); 1779 else 1780 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1781 entry->timer.expires = jiffies + (1 * HZ); 1782 entry->timer.function = lec_arp_expire_arp; 1783 add_timer(&entry->timer); 1784 found = priv->mcast_vcc; 1785 } 1786 1787 out: 1788 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1789 return found; 1790 } 1791 1792 static int 1793 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1794 unsigned long permanent) 1795 { 1796 unsigned long flags; 1797 struct hlist_node *next; 1798 struct lec_arp_table *entry; 1799 int i; 1800 1801 pr_debug("\n"); 1802 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1803 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1804 hlist_for_each_entry_safe(entry, next, 1805 &priv->lec_arp_tables[i], next) { 1806 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1807 (permanent || 1808 !(entry->flags & LEC_PERMANENT_FLAG))) { 1809 lec_arp_remove(priv, entry); 1810 lec_arp_put(entry); 1811 } 1812 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1813 return 0; 1814 } 1815 } 1816 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1817 return -1; 1818 } 1819 1820 /* 1821 * Notifies: Response to arp_request (atm_addr != NULL) 1822 */ 1823 static void 1824 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1825 const unsigned char *atm_addr, unsigned long remoteflag, 1826 unsigned int targetless_le_arp) 1827 { 1828 unsigned long flags; 1829 struct hlist_node *next; 1830 struct lec_arp_table *entry, *tmp; 1831 int i; 1832 1833 pr_debug("%smac:%pM\n", 1834 (targetless_le_arp) ? "targetless " : "", mac_addr); 1835 1836 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1837 entry = lec_arp_find(priv, mac_addr); 1838 if (entry == NULL && targetless_le_arp) 1839 goto out; /* 1840 * LANE2: ignore targetless LE_ARPs for which 1841 * we have no entry in the cache. 7.1.30 1842 */ 1843 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1844 hlist_for_each_entry_safe(entry, next, 1845 &priv->lec_arp_empty_ones, next) { 1846 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1847 hlist_del(&entry->next); 1848 del_timer(&entry->timer); 1849 tmp = lec_arp_find(priv, mac_addr); 1850 if (tmp) { 1851 del_timer(&tmp->timer); 1852 tmp->status = ESI_FORWARD_DIRECT; 1853 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 1854 tmp->vcc = entry->vcc; 1855 tmp->old_push = entry->old_push; 1856 tmp->last_used = jiffies; 1857 del_timer(&entry->timer); 1858 lec_arp_put(entry); 1859 entry = tmp; 1860 } else { 1861 entry->status = ESI_FORWARD_DIRECT; 1862 ether_addr_copy(entry->mac_addr, 1863 mac_addr); 1864 entry->last_used = jiffies; 1865 lec_arp_add(priv, entry); 1866 } 1867 if (remoteflag) 1868 entry->flags |= LEC_REMOTE_FLAG; 1869 else 1870 entry->flags &= ~LEC_REMOTE_FLAG; 1871 pr_debug("After update\n"); 1872 dump_arp_table(priv); 1873 goto out; 1874 } 1875 } 1876 } 1877 1878 entry = lec_arp_find(priv, mac_addr); 1879 if (!entry) { 1880 entry = make_entry(priv, mac_addr); 1881 if (!entry) 1882 goto out; 1883 entry->status = ESI_UNKNOWN; 1884 lec_arp_add(priv, entry); 1885 /* Temporary, changes before end of function */ 1886 } 1887 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 1888 del_timer(&entry->timer); 1889 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1890 hlist_for_each_entry(tmp, 1891 &priv->lec_arp_tables[i], next) { 1892 if (entry != tmp && 1893 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 1894 /* Vcc to this host exists */ 1895 if (tmp->status > ESI_VC_PENDING) { 1896 /* 1897 * ESI_FLUSH_PENDING, 1898 * ESI_FORWARD_DIRECT 1899 */ 1900 entry->vcc = tmp->vcc; 1901 entry->old_push = tmp->old_push; 1902 } 1903 entry->status = tmp->status; 1904 break; 1905 } 1906 } 1907 } 1908 if (remoteflag) 1909 entry->flags |= LEC_REMOTE_FLAG; 1910 else 1911 entry->flags &= ~LEC_REMOTE_FLAG; 1912 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 1913 entry->status = ESI_VC_PENDING; 1914 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 1915 } 1916 pr_debug("After update2\n"); 1917 dump_arp_table(priv); 1918 out: 1919 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1920 } 1921 1922 /* 1923 * Notifies: Vcc setup ready 1924 */ 1925 static void 1926 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 1927 struct atm_vcc *vcc, 1928 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 1929 { 1930 unsigned long flags; 1931 struct lec_arp_table *entry; 1932 int i, found_entry = 0; 1933 1934 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1935 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1936 if (ioc_data->receive == 2) { 1937 pr_debug("LEC_ARP: Attaching mcast forward\n"); 1938 #if 0 1939 entry = lec_arp_find(priv, bus_mac); 1940 if (!entry) { 1941 pr_info("LEC_ARP: Multicast entry not found!\n"); 1942 goto out; 1943 } 1944 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1945 entry->recv_vcc = vcc; 1946 entry->old_recv_push = old_push; 1947 #endif 1948 entry = make_entry(priv, bus_mac); 1949 if (entry == NULL) 1950 goto out; 1951 del_timer(&entry->timer); 1952 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1953 entry->recv_vcc = vcc; 1954 entry->old_recv_push = old_push; 1955 hlist_add_head(&entry->next, &priv->mcast_fwds); 1956 goto out; 1957 } else if (ioc_data->receive == 1) { 1958 /* 1959 * Vcc which we don't want to make default vcc, 1960 * attach it anyway. 1961 */ 1962 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n", 1963 ATM_ESA_LEN, ioc_data->atm_addr); 1964 entry = make_entry(priv, bus_mac); 1965 if (entry == NULL) 1966 goto out; 1967 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1968 eth_zero_addr(entry->mac_addr); 1969 entry->recv_vcc = vcc; 1970 entry->old_recv_push = old_push; 1971 entry->status = ESI_UNKNOWN; 1972 entry->timer.expires = jiffies + priv->vcc_timeout_period; 1973 entry->timer.function = lec_arp_expire_vcc; 1974 hlist_add_head(&entry->next, &priv->lec_no_forward); 1975 add_timer(&entry->timer); 1976 dump_arp_table(priv); 1977 goto out; 1978 } 1979 pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n", 1980 ATM_ESA_LEN, ioc_data->atm_addr); 1981 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1982 hlist_for_each_entry(entry, 1983 &priv->lec_arp_tables[i], next) { 1984 if (memcmp 1985 (ioc_data->atm_addr, entry->atm_addr, 1986 ATM_ESA_LEN) == 0) { 1987 pr_debug("LEC_ARP: Attaching data direct\n"); 1988 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 1989 entry->vcc ? entry->vcc->vci : 0, 1990 entry->recv_vcc ? entry->recv_vcc-> 1991 vci : 0); 1992 found_entry = 1; 1993 del_timer(&entry->timer); 1994 entry->vcc = vcc; 1995 entry->old_push = old_push; 1996 if (entry->status == ESI_VC_PENDING) { 1997 if (priv->maximum_unknown_frame_count 1998 == 0) 1999 entry->status = 2000 ESI_FORWARD_DIRECT; 2001 else { 2002 entry->timestamp = jiffies; 2003 entry->status = 2004 ESI_FLUSH_PENDING; 2005 #if 0 2006 send_to_lecd(priv, l_flush_xmt, 2007 NULL, 2008 entry->atm_addr, 2009 NULL); 2010 #endif 2011 } 2012 } else { 2013 /* 2014 * They were forming a connection 2015 * to us, and we to them. Our 2016 * ATM address is numerically lower 2017 * than theirs, so we make connection 2018 * we formed into default VCC (8.1.11). 2019 * Connection they made gets torn 2020 * down. This might confuse some 2021 * clients. Can be changed if 2022 * someone reports trouble... 2023 */ 2024 ; 2025 } 2026 } 2027 } 2028 } 2029 if (found_entry) { 2030 pr_debug("After vcc was added\n"); 2031 dump_arp_table(priv); 2032 goto out; 2033 } 2034 /* 2035 * Not found, snatch address from first data packet that arrives 2036 * from this vcc 2037 */ 2038 entry = make_entry(priv, bus_mac); 2039 if (!entry) 2040 goto out; 2041 entry->vcc = vcc; 2042 entry->old_push = old_push; 2043 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2044 eth_zero_addr(entry->mac_addr); 2045 entry->status = ESI_UNKNOWN; 2046 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2047 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2048 entry->timer.function = lec_arp_expire_vcc; 2049 add_timer(&entry->timer); 2050 pr_debug("After vcc was added\n"); 2051 dump_arp_table(priv); 2052 out: 2053 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2054 } 2055 2056 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2057 { 2058 unsigned long flags; 2059 struct lec_arp_table *entry; 2060 int i; 2061 2062 pr_debug("%lx\n", tran_id); 2063 restart: 2064 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2065 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2066 hlist_for_each_entry(entry, 2067 &priv->lec_arp_tables[i], next) { 2068 if (entry->flush_tran_id == tran_id && 2069 entry->status == ESI_FLUSH_PENDING) { 2070 struct sk_buff *skb; 2071 struct atm_vcc *vcc = entry->vcc; 2072 2073 lec_arp_hold(entry); 2074 spin_unlock_irqrestore(&priv->lec_arp_lock, 2075 flags); 2076 while ((skb = skb_dequeue(&entry->tx_wait))) 2077 lec_send(vcc, skb); 2078 entry->last_used = jiffies; 2079 entry->status = ESI_FORWARD_DIRECT; 2080 lec_arp_put(entry); 2081 pr_debug("LEC_ARP: Flushed\n"); 2082 goto restart; 2083 } 2084 } 2085 } 2086 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2087 dump_arp_table(priv); 2088 } 2089 2090 static void 2091 lec_set_flush_tran_id(struct lec_priv *priv, 2092 const unsigned char *atm_addr, unsigned long tran_id) 2093 { 2094 unsigned long flags; 2095 struct lec_arp_table *entry; 2096 int i; 2097 2098 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2099 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2100 hlist_for_each_entry(entry, 2101 &priv->lec_arp_tables[i], next) { 2102 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2103 entry->flush_tran_id = tran_id; 2104 pr_debug("Set flush transaction id to %lx for %p\n", 2105 tran_id, entry); 2106 } 2107 } 2108 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2109 } 2110 2111 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2112 { 2113 unsigned long flags; 2114 unsigned char mac_addr[] = { 2115 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2116 }; 2117 struct lec_arp_table *to_add; 2118 struct lec_vcc_priv *vpriv; 2119 int err = 0; 2120 2121 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 2122 if (!vpriv) 2123 return -ENOMEM; 2124 vpriv->xoff = 0; 2125 vpriv->old_pop = vcc->pop; 2126 vcc->user_back = vpriv; 2127 vcc->pop = lec_pop; 2128 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2129 to_add = make_entry(priv, mac_addr); 2130 if (!to_add) { 2131 vcc->pop = vpriv->old_pop; 2132 kfree(vpriv); 2133 err = -ENOMEM; 2134 goto out; 2135 } 2136 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2137 to_add->status = ESI_FORWARD_DIRECT; 2138 to_add->flags |= LEC_PERMANENT_FLAG; 2139 to_add->vcc = vcc; 2140 to_add->old_push = vcc->push; 2141 vcc->push = lec_push; 2142 priv->mcast_vcc = vcc; 2143 lec_arp_add(priv, to_add); 2144 out: 2145 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2146 return err; 2147 } 2148 2149 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2150 { 2151 unsigned long flags; 2152 struct hlist_node *next; 2153 struct lec_arp_table *entry; 2154 int i; 2155 2156 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2157 dump_arp_table(priv); 2158 2159 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2160 2161 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2162 hlist_for_each_entry_safe(entry, next, 2163 &priv->lec_arp_tables[i], next) { 2164 if (vcc == entry->vcc) { 2165 lec_arp_remove(priv, entry); 2166 lec_arp_put(entry); 2167 if (priv->mcast_vcc == vcc) 2168 priv->mcast_vcc = NULL; 2169 } 2170 } 2171 } 2172 2173 hlist_for_each_entry_safe(entry, next, 2174 &priv->lec_arp_empty_ones, next) { 2175 if (entry->vcc == vcc) { 2176 lec_arp_clear_vccs(entry); 2177 del_timer(&entry->timer); 2178 hlist_del(&entry->next); 2179 lec_arp_put(entry); 2180 } 2181 } 2182 2183 hlist_for_each_entry_safe(entry, next, 2184 &priv->lec_no_forward, next) { 2185 if (entry->recv_vcc == vcc) { 2186 lec_arp_clear_vccs(entry); 2187 del_timer(&entry->timer); 2188 hlist_del(&entry->next); 2189 lec_arp_put(entry); 2190 } 2191 } 2192 2193 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 2194 if (entry->recv_vcc == vcc) { 2195 lec_arp_clear_vccs(entry); 2196 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2197 hlist_del(&entry->next); 2198 lec_arp_put(entry); 2199 } 2200 } 2201 2202 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2203 dump_arp_table(priv); 2204 } 2205 2206 static void 2207 lec_arp_check_empties(struct lec_priv *priv, 2208 struct atm_vcc *vcc, struct sk_buff *skb) 2209 { 2210 unsigned long flags; 2211 struct hlist_node *next; 2212 struct lec_arp_table *entry, *tmp; 2213 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2214 unsigned char *src = hdr->h_source; 2215 2216 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2217 hlist_for_each_entry_safe(entry, next, 2218 &priv->lec_arp_empty_ones, next) { 2219 if (vcc == entry->vcc) { 2220 del_timer(&entry->timer); 2221 ether_addr_copy(entry->mac_addr, src); 2222 entry->status = ESI_FORWARD_DIRECT; 2223 entry->last_used = jiffies; 2224 /* We might have got an entry */ 2225 tmp = lec_arp_find(priv, src); 2226 if (tmp) { 2227 lec_arp_remove(priv, tmp); 2228 lec_arp_put(tmp); 2229 } 2230 hlist_del(&entry->next); 2231 lec_arp_add(priv, entry); 2232 goto out; 2233 } 2234 } 2235 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2236 out: 2237 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2238 } 2239 2240 MODULE_LICENSE("GPL"); 2241