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) 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 int i; 803 804 for (i = 0; i < ETH_ALEN; i++) 805 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); 806 seq_printf(seq, " "); 807 for (i = 0; i < ATM_ESA_LEN; i++) 808 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); 809 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), 810 entry->flags & 0xffff); 811 if (entry->vcc) 812 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); 813 else 814 seq_printf(seq, " "); 815 if (entry->recv_vcc) { 816 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, 817 entry->recv_vcc->vci); 818 } 819 seq_putc(seq, '\n'); 820 } 821 822 struct lec_state { 823 unsigned long flags; 824 struct lec_priv *locked; 825 struct hlist_node *node; 826 struct net_device *dev; 827 int itf; 828 int arp_table; 829 int misc_table; 830 }; 831 832 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl, 833 loff_t *l) 834 { 835 struct hlist_node *e = state->node; 836 837 if (!e) 838 e = tbl->first; 839 if (e == SEQ_START_TOKEN) { 840 e = tbl->first; 841 --*l; 842 } 843 844 for (; e; e = e->next) { 845 if (--*l < 0) 846 break; 847 } 848 state->node = e; 849 850 return (*l < 0) ? state : NULL; 851 } 852 853 static void *lec_arp_walk(struct lec_state *state, loff_t *l, 854 struct lec_priv *priv) 855 { 856 void *v = NULL; 857 int p; 858 859 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { 860 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l); 861 if (v) 862 break; 863 } 864 state->arp_table = p; 865 return v; 866 } 867 868 static void *lec_misc_walk(struct lec_state *state, loff_t *l, 869 struct lec_priv *priv) 870 { 871 struct hlist_head *lec_misc_tables[] = { 872 &priv->lec_arp_empty_ones, 873 &priv->lec_no_forward, 874 &priv->mcast_fwds 875 }; 876 void *v = NULL; 877 int q; 878 879 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { 880 v = lec_tbl_walk(state, lec_misc_tables[q], l); 881 if (v) 882 break; 883 } 884 state->misc_table = q; 885 return v; 886 } 887 888 static void *lec_priv_walk(struct lec_state *state, loff_t *l, 889 struct lec_priv *priv) 890 { 891 if (!state->locked) { 892 state->locked = priv; 893 spin_lock_irqsave(&priv->lec_arp_lock, state->flags); 894 } 895 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) { 896 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); 897 state->locked = NULL; 898 /* Partial state reset for the next time we get called */ 899 state->arp_table = state->misc_table = 0; 900 } 901 return state->locked; 902 } 903 904 static void *lec_itf_walk(struct lec_state *state, loff_t *l) 905 { 906 struct net_device *dev; 907 void *v; 908 909 dev = state->dev ? state->dev : dev_lec[state->itf]; 910 v = (dev && netdev_priv(dev)) ? 911 lec_priv_walk(state, l, netdev_priv(dev)) : NULL; 912 if (!v && dev) { 913 dev_put(dev); 914 /* Partial state reset for the next time we get called */ 915 dev = NULL; 916 } 917 state->dev = dev; 918 return v; 919 } 920 921 static void *lec_get_idx(struct lec_state *state, loff_t l) 922 { 923 void *v = NULL; 924 925 for (; state->itf < MAX_LEC_ITF; state->itf++) { 926 v = lec_itf_walk(state, &l); 927 if (v) 928 break; 929 } 930 return v; 931 } 932 933 static void *lec_seq_start(struct seq_file *seq, loff_t *pos) 934 { 935 struct lec_state *state = seq->private; 936 937 state->itf = 0; 938 state->dev = NULL; 939 state->locked = NULL; 940 state->arp_table = 0; 941 state->misc_table = 0; 942 state->node = SEQ_START_TOKEN; 943 944 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN; 945 } 946 947 static void lec_seq_stop(struct seq_file *seq, void *v) 948 { 949 struct lec_state *state = seq->private; 950 951 if (state->dev) { 952 spin_unlock_irqrestore(&state->locked->lec_arp_lock, 953 state->flags); 954 dev_put(state->dev); 955 } 956 } 957 958 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos) 959 { 960 struct lec_state *state = seq->private; 961 962 v = lec_get_idx(state, 1); 963 *pos += !!PTR_ERR(v); 964 return v; 965 } 966 967 static int lec_seq_show(struct seq_file *seq, void *v) 968 { 969 static const char lec_banner[] = 970 "Itf MAC ATM destination" 971 " Status Flags " 972 "VPI/VCI Recv VPI/VCI\n"; 973 974 if (v == SEQ_START_TOKEN) 975 seq_puts(seq, lec_banner); 976 else { 977 struct lec_state *state = seq->private; 978 struct net_device *dev = state->dev; 979 struct lec_arp_table *entry = hlist_entry(state->node, 980 struct lec_arp_table, 981 next); 982 983 seq_printf(seq, "%s ", dev->name); 984 lec_info(seq, entry); 985 } 986 return 0; 987 } 988 989 static const struct seq_operations lec_seq_ops = { 990 .start = lec_seq_start, 991 .next = lec_seq_next, 992 .stop = lec_seq_stop, 993 .show = lec_seq_show, 994 }; 995 #endif 996 997 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 998 { 999 struct atm_vcc *vcc = ATM_SD(sock); 1000 int err = 0; 1001 1002 switch (cmd) { 1003 case ATMLEC_CTRL: 1004 case ATMLEC_MCAST: 1005 case ATMLEC_DATA: 1006 if (!capable(CAP_NET_ADMIN)) 1007 return -EPERM; 1008 break; 1009 default: 1010 return -ENOIOCTLCMD; 1011 } 1012 1013 switch (cmd) { 1014 case ATMLEC_CTRL: 1015 err = lecd_attach(vcc, (int)arg); 1016 if (err >= 0) 1017 sock->state = SS_CONNECTED; 1018 break; 1019 case ATMLEC_MCAST: 1020 err = lec_mcast_attach(vcc, (int)arg); 1021 break; 1022 case ATMLEC_DATA: 1023 err = lec_vcc_attach(vcc, (void __user *)arg); 1024 break; 1025 } 1026 1027 return err; 1028 } 1029 1030 static struct atm_ioctl lane_ioctl_ops = { 1031 .owner = THIS_MODULE, 1032 .ioctl = lane_ioctl, 1033 }; 1034 1035 static int __init lane_module_init(void) 1036 { 1037 #ifdef CONFIG_PROC_FS 1038 struct proc_dir_entry *p; 1039 1040 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops, 1041 sizeof(struct lec_state), NULL); 1042 if (!p) { 1043 pr_err("Unable to initialize /proc/net/atm/lec\n"); 1044 return -ENOMEM; 1045 } 1046 #endif 1047 1048 register_atm_ioctl(&lane_ioctl_ops); 1049 pr_info("lec.c: initialized\n"); 1050 return 0; 1051 } 1052 1053 static void __exit lane_module_cleanup(void) 1054 { 1055 int i; 1056 1057 #ifdef CONFIG_PROC_FS 1058 remove_proc_entry("lec", atm_proc_root); 1059 #endif 1060 1061 deregister_atm_ioctl(&lane_ioctl_ops); 1062 1063 for (i = 0; i < MAX_LEC_ITF; i++) { 1064 if (dev_lec[i] != NULL) { 1065 unregister_netdev(dev_lec[i]); 1066 free_netdev(dev_lec[i]); 1067 dev_lec[i] = NULL; 1068 } 1069 } 1070 } 1071 1072 module_init(lane_module_init); 1073 module_exit(lane_module_cleanup); 1074 1075 /* 1076 * LANE2: 3.1.3, LE_RESOLVE.request 1077 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs. 1078 * If sizeoftlvs == NULL the default TLVs associated with with this 1079 * lec will be used. 1080 * If dst_mac == NULL, targetless LE_ARP will be sent 1081 */ 1082 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force, 1083 u8 **tlvs, u32 *sizeoftlvs) 1084 { 1085 unsigned long flags; 1086 struct lec_priv *priv = netdev_priv(dev); 1087 struct lec_arp_table *table; 1088 struct sk_buff *skb; 1089 int retval; 1090 1091 if (force == 0) { 1092 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1093 table = lec_arp_find(priv, dst_mac); 1094 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1095 if (table == NULL) 1096 return -1; 1097 1098 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC); 1099 if (*tlvs == NULL) 1100 return -1; 1101 1102 *sizeoftlvs = table->sizeoftlvs; 1103 1104 return 0; 1105 } 1106 1107 if (sizeoftlvs == NULL) 1108 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL); 1109 1110 else { 1111 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC); 1112 if (skb == NULL) 1113 return -1; 1114 skb->len = *sizeoftlvs; 1115 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs); 1116 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb); 1117 } 1118 return retval; 1119 } 1120 1121 /* 1122 * LANE2: 3.1.4, LE_ASSOCIATE.request 1123 * Associate the *tlvs with the *lan_dst address. 1124 * Will overwrite any previous association 1125 * Returns 1 for success, 0 for failure (out of memory) 1126 * 1127 */ 1128 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst, 1129 const u8 *tlvs, u32 sizeoftlvs) 1130 { 1131 int retval; 1132 struct sk_buff *skb; 1133 struct lec_priv *priv = netdev_priv(dev); 1134 1135 if (!ether_addr_equal(lan_dst, dev->dev_addr)) 1136 return 0; /* not our mac address */ 1137 1138 kfree(priv->tlvs); /* NULL if there was no previous association */ 1139 1140 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1141 if (priv->tlvs == NULL) 1142 return 0; 1143 priv->sizeoftlvs = sizeoftlvs; 1144 1145 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC); 1146 if (skb == NULL) 1147 return 0; 1148 skb->len = sizeoftlvs; 1149 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs); 1150 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb); 1151 if (retval != 0) 1152 pr_info("lec.c: lane2_associate_req() failed\n"); 1153 /* 1154 * If the previous association has changed we must 1155 * somehow notify other LANE entities about the change 1156 */ 1157 return 1; 1158 } 1159 1160 /* 1161 * LANE2: 3.1.5, LE_ASSOCIATE.indication 1162 * 1163 */ 1164 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr, 1165 const u8 *tlvs, u32 sizeoftlvs) 1166 { 1167 #if 0 1168 int i = 0; 1169 #endif 1170 struct lec_priv *priv = netdev_priv(dev); 1171 #if 0 /* 1172 * Why have the TLVs in LE_ARP entries 1173 * since we do not use them? When you 1174 * uncomment this code, make sure the 1175 * TLVs get freed when entry is killed 1176 */ 1177 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr); 1178 1179 if (entry == NULL) 1180 return; /* should not happen */ 1181 1182 kfree(entry->tlvs); 1183 1184 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL); 1185 if (entry->tlvs == NULL) 1186 return; 1187 entry->sizeoftlvs = sizeoftlvs; 1188 #endif 1189 #if 0 1190 pr_info("\n"); 1191 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs); 1192 while (i < sizeoftlvs) 1193 pr_cont("%02x ", tlvs[i++]); 1194 1195 pr_cont("\n"); 1196 #endif 1197 1198 /* tell MPOA about the TLVs we saw */ 1199 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) { 1200 priv->lane2_ops->associate_indicator(dev, mac_addr, 1201 tlvs, sizeoftlvs); 1202 } 1203 } 1204 1205 /* 1206 * Here starts what used to lec_arpc.c 1207 * 1208 * lec_arpc.c was added here when making 1209 * lane client modular. October 1997 1210 */ 1211 1212 #include <linux/types.h> 1213 #include <linux/timer.h> 1214 #include <linux/param.h> 1215 #include <linux/atomic.h> 1216 #include <linux/inetdevice.h> 1217 #include <net/route.h> 1218 1219 #if 0 1220 #define pr_debug(format, args...) 1221 /* 1222 #define pr_debug printk 1223 */ 1224 #endif 1225 #define DEBUG_ARP_TABLE 0 1226 1227 #define LEC_ARP_REFRESH_INTERVAL (3*HZ) 1228 1229 static void lec_arp_check_expire(struct work_struct *work); 1230 static void lec_arp_expire_arp(struct timer_list *t); 1231 1232 /* 1233 * Arp table funcs 1234 */ 1235 1236 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1)) 1237 1238 /* 1239 * Initialization of arp-cache 1240 */ 1241 static void lec_arp_init(struct lec_priv *priv) 1242 { 1243 unsigned short i; 1244 1245 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 1246 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1247 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1248 INIT_HLIST_HEAD(&priv->lec_no_forward); 1249 INIT_HLIST_HEAD(&priv->mcast_fwds); 1250 spin_lock_init(&priv->lec_arp_lock); 1251 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire); 1252 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1253 } 1254 1255 static void lec_arp_clear_vccs(struct lec_arp_table *entry) 1256 { 1257 if (entry->vcc) { 1258 struct atm_vcc *vcc = entry->vcc; 1259 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); 1260 struct net_device *dev = (struct net_device *)vcc->proto_data; 1261 1262 vcc->pop = vpriv->old_pop; 1263 if (vpriv->xoff) 1264 netif_wake_queue(dev); 1265 kfree(vpriv); 1266 vcc->user_back = NULL; 1267 vcc->push = entry->old_push; 1268 vcc_release_async(vcc, -EPIPE); 1269 entry->vcc = NULL; 1270 } 1271 if (entry->recv_vcc) { 1272 entry->recv_vcc->push = entry->old_recv_push; 1273 vcc_release_async(entry->recv_vcc, -EPIPE); 1274 entry->recv_vcc = NULL; 1275 } 1276 } 1277 1278 /* 1279 * Insert entry to lec_arp_table 1280 * LANE2: Add to the end of the list to satisfy 8.1.13 1281 */ 1282 static inline void 1283 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry) 1284 { 1285 struct hlist_head *tmp; 1286 1287 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])]; 1288 hlist_add_head(&entry->next, tmp); 1289 1290 pr_debug("Added entry:%pM\n", entry->mac_addr); 1291 } 1292 1293 /* 1294 * Remove entry from lec_arp_table 1295 */ 1296 static int 1297 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove) 1298 { 1299 struct lec_arp_table *entry; 1300 int i, remove_vcc = 1; 1301 1302 if (!to_remove) 1303 return -1; 1304 1305 hlist_del(&to_remove->next); 1306 del_timer(&to_remove->timer); 1307 1308 /* 1309 * If this is the only MAC connected to this VCC, 1310 * also tear down the VCC 1311 */ 1312 if (to_remove->status >= ESI_FLUSH_PENDING) { 1313 /* 1314 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT 1315 */ 1316 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1317 hlist_for_each_entry(entry, 1318 &priv->lec_arp_tables[i], next) { 1319 if (memcmp(to_remove->atm_addr, 1320 entry->atm_addr, ATM_ESA_LEN) == 0) { 1321 remove_vcc = 0; 1322 break; 1323 } 1324 } 1325 } 1326 if (remove_vcc) 1327 lec_arp_clear_vccs(to_remove); 1328 } 1329 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */ 1330 1331 pr_debug("Removed entry:%pM\n", to_remove->mac_addr); 1332 return 0; 1333 } 1334 1335 #if DEBUG_ARP_TABLE 1336 static const char *get_status_string(unsigned char st) 1337 { 1338 switch (st) { 1339 case ESI_UNKNOWN: 1340 return "ESI_UNKNOWN"; 1341 case ESI_ARP_PENDING: 1342 return "ESI_ARP_PENDING"; 1343 case ESI_VC_PENDING: 1344 return "ESI_VC_PENDING"; 1345 case ESI_FLUSH_PENDING: 1346 return "ESI_FLUSH_PENDING"; 1347 case ESI_FORWARD_DIRECT: 1348 return "ESI_FORWARD_DIRECT"; 1349 } 1350 return "<UNKNOWN>"; 1351 } 1352 1353 static void dump_arp_table(struct lec_priv *priv) 1354 { 1355 struct lec_arp_table *rulla; 1356 char buf[256]; 1357 int i, j, offset; 1358 1359 pr_info("Dump %p:\n", priv); 1360 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1361 hlist_for_each_entry(rulla, 1362 &priv->lec_arp_tables[i], next) { 1363 offset = 0; 1364 offset += sprintf(buf, "%d: %p\n", i, rulla); 1365 offset += sprintf(buf + offset, "Mac: %pM", 1366 rulla->mac_addr); 1367 offset += sprintf(buf + offset, " Atm:"); 1368 for (j = 0; j < ATM_ESA_LEN; j++) { 1369 offset += sprintf(buf + offset, 1370 "%2.2x ", 1371 rulla->atm_addr[j] & 0xff); 1372 } 1373 offset += sprintf(buf + offset, 1374 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1375 rulla->vcc ? rulla->vcc->vpi : 0, 1376 rulla->vcc ? rulla->vcc->vci : 0, 1377 rulla->recv_vcc ? rulla->recv_vcc-> 1378 vpi : 0, 1379 rulla->recv_vcc ? rulla->recv_vcc-> 1380 vci : 0, rulla->last_used, 1381 rulla->timestamp, rulla->no_tries); 1382 offset += 1383 sprintf(buf + offset, 1384 "Flags:%x, Packets_flooded:%x, Status: %s ", 1385 rulla->flags, rulla->packets_flooded, 1386 get_status_string(rulla->status)); 1387 pr_info("%s\n", buf); 1388 } 1389 } 1390 1391 if (!hlist_empty(&priv->lec_no_forward)) 1392 pr_info("No forward\n"); 1393 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) { 1394 offset = 0; 1395 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1396 offset += sprintf(buf + offset, " Atm:"); 1397 for (j = 0; j < ATM_ESA_LEN; j++) { 1398 offset += sprintf(buf + offset, "%2.2x ", 1399 rulla->atm_addr[j] & 0xff); 1400 } 1401 offset += sprintf(buf + offset, 1402 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1403 rulla->vcc ? rulla->vcc->vpi : 0, 1404 rulla->vcc ? rulla->vcc->vci : 0, 1405 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1406 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1407 rulla->last_used, 1408 rulla->timestamp, rulla->no_tries); 1409 offset += sprintf(buf + offset, 1410 "Flags:%x, Packets_flooded:%x, Status: %s ", 1411 rulla->flags, rulla->packets_flooded, 1412 get_status_string(rulla->status)); 1413 pr_info("%s\n", buf); 1414 } 1415 1416 if (!hlist_empty(&priv->lec_arp_empty_ones)) 1417 pr_info("Empty ones\n"); 1418 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) { 1419 offset = 0; 1420 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1421 offset += sprintf(buf + offset, " Atm:"); 1422 for (j = 0; j < ATM_ESA_LEN; j++) { 1423 offset += sprintf(buf + offset, "%2.2x ", 1424 rulla->atm_addr[j] & 0xff); 1425 } 1426 offset += sprintf(buf + offset, 1427 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1428 rulla->vcc ? rulla->vcc->vpi : 0, 1429 rulla->vcc ? rulla->vcc->vci : 0, 1430 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1431 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1432 rulla->last_used, 1433 rulla->timestamp, rulla->no_tries); 1434 offset += sprintf(buf + offset, 1435 "Flags:%x, Packets_flooded:%x, Status: %s ", 1436 rulla->flags, rulla->packets_flooded, 1437 get_status_string(rulla->status)); 1438 pr_info("%s", buf); 1439 } 1440 1441 if (!hlist_empty(&priv->mcast_fwds)) 1442 pr_info("Multicast Forward VCCs\n"); 1443 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) { 1444 offset = 0; 1445 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr); 1446 offset += sprintf(buf + offset, " Atm:"); 1447 for (j = 0; j < ATM_ESA_LEN; j++) { 1448 offset += sprintf(buf + offset, "%2.2x ", 1449 rulla->atm_addr[j] & 0xff); 1450 } 1451 offset += sprintf(buf + offset, 1452 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ", 1453 rulla->vcc ? rulla->vcc->vpi : 0, 1454 rulla->vcc ? rulla->vcc->vci : 0, 1455 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0, 1456 rulla->recv_vcc ? rulla->recv_vcc->vci : 0, 1457 rulla->last_used, 1458 rulla->timestamp, rulla->no_tries); 1459 offset += sprintf(buf + offset, 1460 "Flags:%x, Packets_flooded:%x, Status: %s ", 1461 rulla->flags, rulla->packets_flooded, 1462 get_status_string(rulla->status)); 1463 pr_info("%s\n", buf); 1464 } 1465 1466 } 1467 #else 1468 #define dump_arp_table(priv) do { } while (0) 1469 #endif 1470 1471 /* 1472 * Destruction of arp-cache 1473 */ 1474 static void lec_arp_destroy(struct lec_priv *priv) 1475 { 1476 unsigned long flags; 1477 struct hlist_node *next; 1478 struct lec_arp_table *entry; 1479 int i; 1480 1481 cancel_delayed_work_sync(&priv->lec_arp_work); 1482 1483 /* 1484 * Remove all entries 1485 */ 1486 1487 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1488 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1489 hlist_for_each_entry_safe(entry, next, 1490 &priv->lec_arp_tables[i], next) { 1491 lec_arp_remove(priv, entry); 1492 lec_arp_put(entry); 1493 } 1494 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]); 1495 } 1496 1497 hlist_for_each_entry_safe(entry, next, 1498 &priv->lec_arp_empty_ones, next) { 1499 del_timer_sync(&entry->timer); 1500 lec_arp_clear_vccs(entry); 1501 hlist_del(&entry->next); 1502 lec_arp_put(entry); 1503 } 1504 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones); 1505 1506 hlist_for_each_entry_safe(entry, next, 1507 &priv->lec_no_forward, next) { 1508 del_timer_sync(&entry->timer); 1509 lec_arp_clear_vccs(entry); 1510 hlist_del(&entry->next); 1511 lec_arp_put(entry); 1512 } 1513 INIT_HLIST_HEAD(&priv->lec_no_forward); 1514 1515 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 1516 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1517 lec_arp_clear_vccs(entry); 1518 hlist_del(&entry->next); 1519 lec_arp_put(entry); 1520 } 1521 INIT_HLIST_HEAD(&priv->mcast_fwds); 1522 priv->mcast_vcc = NULL; 1523 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1524 } 1525 1526 /* 1527 * Find entry by mac_address 1528 */ 1529 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv, 1530 const unsigned char *mac_addr) 1531 { 1532 struct hlist_head *head; 1533 struct lec_arp_table *entry; 1534 1535 pr_debug("%pM\n", mac_addr); 1536 1537 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])]; 1538 hlist_for_each_entry(entry, head, next) { 1539 if (ether_addr_equal(mac_addr, entry->mac_addr)) 1540 return entry; 1541 } 1542 return NULL; 1543 } 1544 1545 static struct lec_arp_table *make_entry(struct lec_priv *priv, 1546 const unsigned char *mac_addr) 1547 { 1548 struct lec_arp_table *to_return; 1549 1550 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC); 1551 if (!to_return) { 1552 pr_info("LEC: Arp entry kmalloc failed\n"); 1553 return NULL; 1554 } 1555 ether_addr_copy(to_return->mac_addr, mac_addr); 1556 INIT_HLIST_NODE(&to_return->next); 1557 timer_setup(&to_return->timer, lec_arp_expire_arp, 0); 1558 to_return->last_used = jiffies; 1559 to_return->priv = priv; 1560 skb_queue_head_init(&to_return->tx_wait); 1561 refcount_set(&to_return->usage, 1); 1562 return to_return; 1563 } 1564 1565 /* Arp sent timer expired */ 1566 static void lec_arp_expire_arp(struct timer_list *t) 1567 { 1568 struct lec_arp_table *entry; 1569 1570 entry = from_timer(entry, t, timer); 1571 1572 pr_debug("\n"); 1573 if (entry->status == ESI_ARP_PENDING) { 1574 if (entry->no_tries <= entry->priv->max_retry_count) { 1575 if (entry->is_rdesc) 1576 send_to_lecd(entry->priv, l_rdesc_arp_xmt, 1577 entry->mac_addr, NULL, NULL); 1578 else 1579 send_to_lecd(entry->priv, l_arp_xmt, 1580 entry->mac_addr, NULL, NULL); 1581 entry->no_tries++; 1582 } 1583 mod_timer(&entry->timer, jiffies + (1 * HZ)); 1584 } 1585 } 1586 1587 /* Unknown/unused vcc expire, remove associated entry */ 1588 static void lec_arp_expire_vcc(struct timer_list *t) 1589 { 1590 unsigned long flags; 1591 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer); 1592 struct lec_priv *priv = to_remove->priv; 1593 1594 del_timer(&to_remove->timer); 1595 1596 pr_debug("%p %p: vpi:%d vci:%d\n", 1597 to_remove, priv, 1598 to_remove->vcc ? to_remove->recv_vcc->vpi : 0, 1599 to_remove->vcc ? to_remove->recv_vcc->vci : 0); 1600 1601 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1602 hlist_del(&to_remove->next); 1603 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1604 1605 lec_arp_clear_vccs(to_remove); 1606 lec_arp_put(to_remove); 1607 } 1608 1609 static bool __lec_arp_check_expire(struct lec_arp_table *entry, 1610 unsigned long now, 1611 struct lec_priv *priv) 1612 { 1613 unsigned long time_to_check; 1614 1615 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change) 1616 time_to_check = priv->forward_delay_time; 1617 else 1618 time_to_check = priv->aging_time; 1619 1620 pr_debug("About to expire: %lx - %lx > %lx\n", 1621 now, entry->last_used, time_to_check); 1622 if (time_after(now, entry->last_used + time_to_check) && 1623 !(entry->flags & LEC_PERMANENT_FLAG) && 1624 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */ 1625 /* Remove entry */ 1626 pr_debug("Entry timed out\n"); 1627 lec_arp_remove(priv, entry); 1628 lec_arp_put(entry); 1629 } else { 1630 /* Something else */ 1631 if ((entry->status == ESI_VC_PENDING || 1632 entry->status == ESI_ARP_PENDING) && 1633 time_after_eq(now, entry->timestamp + 1634 priv->max_unknown_frame_time)) { 1635 entry->timestamp = jiffies; 1636 entry->packets_flooded = 0; 1637 if (entry->status == ESI_VC_PENDING) 1638 send_to_lecd(priv, l_svc_setup, 1639 entry->mac_addr, 1640 entry->atm_addr, 1641 NULL); 1642 } 1643 if (entry->status == ESI_FLUSH_PENDING && 1644 time_after_eq(now, entry->timestamp + 1645 priv->path_switching_delay)) { 1646 lec_arp_hold(entry); 1647 return true; 1648 } 1649 } 1650 1651 return false; 1652 } 1653 /* 1654 * Expire entries. 1655 * 1. Re-set timer 1656 * 2. For each entry, delete entries that have aged past the age limit. 1657 * 3. For each entry, depending on the status of the entry, perform 1658 * the following maintenance. 1659 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the 1660 * tick_count is above the max_unknown_frame_time, clear 1661 * the tick_count to zero and clear the packets_flooded counter 1662 * to zero. This supports the packet rate limit per address 1663 * while flooding unknowns. 1664 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater 1665 * than or equal to the path_switching_delay, change the status 1666 * to ESI_FORWARD_DIRECT. This causes the flush period to end 1667 * regardless of the progress of the flush protocol. 1668 */ 1669 static void lec_arp_check_expire(struct work_struct *work) 1670 { 1671 unsigned long flags; 1672 struct lec_priv *priv = 1673 container_of(work, struct lec_priv, lec_arp_work.work); 1674 struct hlist_node *next; 1675 struct lec_arp_table *entry; 1676 unsigned long now; 1677 int i; 1678 1679 pr_debug("%p\n", priv); 1680 now = jiffies; 1681 restart: 1682 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1683 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1684 hlist_for_each_entry_safe(entry, next, 1685 &priv->lec_arp_tables[i], next) { 1686 if (__lec_arp_check_expire(entry, now, priv)) { 1687 struct sk_buff *skb; 1688 struct atm_vcc *vcc = entry->vcc; 1689 1690 spin_unlock_irqrestore(&priv->lec_arp_lock, 1691 flags); 1692 while ((skb = skb_dequeue(&entry->tx_wait))) 1693 lec_send(vcc, skb); 1694 entry->last_used = jiffies; 1695 entry->status = ESI_FORWARD_DIRECT; 1696 lec_arp_put(entry); 1697 1698 goto restart; 1699 } 1700 } 1701 } 1702 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1703 1704 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL); 1705 } 1706 1707 /* 1708 * Try to find vcc where mac_address is attached. 1709 * 1710 */ 1711 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv, 1712 const unsigned char *mac_to_find, 1713 int is_rdesc, 1714 struct lec_arp_table **ret_entry) 1715 { 1716 unsigned long flags; 1717 struct lec_arp_table *entry; 1718 struct atm_vcc *found; 1719 1720 if (mac_to_find[0] & 0x01) { 1721 switch (priv->lane_version) { 1722 case 1: 1723 return priv->mcast_vcc; 1724 case 2: /* LANE2 wants arp for multicast addresses */ 1725 if (ether_addr_equal(mac_to_find, bus_mac)) 1726 return priv->mcast_vcc; 1727 break; 1728 default: 1729 break; 1730 } 1731 } 1732 1733 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1734 entry = lec_arp_find(priv, mac_to_find); 1735 1736 if (entry) { 1737 if (entry->status == ESI_FORWARD_DIRECT) { 1738 /* Connection Ok */ 1739 entry->last_used = jiffies; 1740 lec_arp_hold(entry); 1741 *ret_entry = entry; 1742 found = entry->vcc; 1743 goto out; 1744 } 1745 /* 1746 * If the LE_ARP cache entry is still pending, reset count to 0 1747 * so another LE_ARP request can be made for this frame. 1748 */ 1749 if (entry->status == ESI_ARP_PENDING) 1750 entry->no_tries = 0; 1751 /* 1752 * Data direct VC not yet set up, check to see if the unknown 1753 * frame count is greater than the limit. If the limit has 1754 * not been reached, allow the caller to send packet to 1755 * BUS. 1756 */ 1757 if (entry->status != ESI_FLUSH_PENDING && 1758 entry->packets_flooded < 1759 priv->maximum_unknown_frame_count) { 1760 entry->packets_flooded++; 1761 pr_debug("Flooding..\n"); 1762 found = priv->mcast_vcc; 1763 goto out; 1764 } 1765 /* 1766 * We got here because entry->status == ESI_FLUSH_PENDING 1767 * or BUS flood limit was reached for an entry which is 1768 * in ESI_ARP_PENDING or ESI_VC_PENDING state. 1769 */ 1770 lec_arp_hold(entry); 1771 *ret_entry = entry; 1772 pr_debug("entry->status %d entry->vcc %p\n", entry->status, 1773 entry->vcc); 1774 found = NULL; 1775 } else { 1776 /* No matching entry was found */ 1777 entry = make_entry(priv, mac_to_find); 1778 pr_debug("Making entry\n"); 1779 if (!entry) { 1780 found = priv->mcast_vcc; 1781 goto out; 1782 } 1783 lec_arp_add(priv, entry); 1784 /* We want arp-request(s) to be sent */ 1785 entry->packets_flooded = 1; 1786 entry->status = ESI_ARP_PENDING; 1787 entry->no_tries = 1; 1788 entry->last_used = entry->timestamp = jiffies; 1789 entry->is_rdesc = is_rdesc; 1790 if (entry->is_rdesc) 1791 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL, 1792 NULL); 1793 else 1794 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL); 1795 entry->timer.expires = jiffies + (1 * HZ); 1796 entry->timer.function = lec_arp_expire_arp; 1797 add_timer(&entry->timer); 1798 found = priv->mcast_vcc; 1799 } 1800 1801 out: 1802 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1803 return found; 1804 } 1805 1806 static int 1807 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr, 1808 unsigned long permanent) 1809 { 1810 unsigned long flags; 1811 struct hlist_node *next; 1812 struct lec_arp_table *entry; 1813 int i; 1814 1815 pr_debug("\n"); 1816 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1817 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1818 hlist_for_each_entry_safe(entry, next, 1819 &priv->lec_arp_tables[i], next) { 1820 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) && 1821 (permanent || 1822 !(entry->flags & LEC_PERMANENT_FLAG))) { 1823 lec_arp_remove(priv, entry); 1824 lec_arp_put(entry); 1825 } 1826 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1827 return 0; 1828 } 1829 } 1830 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1831 return -1; 1832 } 1833 1834 /* 1835 * Notifies: Response to arp_request (atm_addr != NULL) 1836 */ 1837 static void 1838 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr, 1839 const unsigned char *atm_addr, unsigned long remoteflag, 1840 unsigned int targetless_le_arp) 1841 { 1842 unsigned long flags; 1843 struct hlist_node *next; 1844 struct lec_arp_table *entry, *tmp; 1845 int i; 1846 1847 pr_debug("%smac:%pM\n", 1848 (targetless_le_arp) ? "targetless " : "", mac_addr); 1849 1850 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1851 entry = lec_arp_find(priv, mac_addr); 1852 if (entry == NULL && targetless_le_arp) 1853 goto out; /* 1854 * LANE2: ignore targetless LE_ARPs for which 1855 * we have no entry in the cache. 7.1.30 1856 */ 1857 if (!hlist_empty(&priv->lec_arp_empty_ones)) { 1858 hlist_for_each_entry_safe(entry, next, 1859 &priv->lec_arp_empty_ones, next) { 1860 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) { 1861 hlist_del(&entry->next); 1862 del_timer(&entry->timer); 1863 tmp = lec_arp_find(priv, mac_addr); 1864 if (tmp) { 1865 del_timer(&tmp->timer); 1866 tmp->status = ESI_FORWARD_DIRECT; 1867 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN); 1868 tmp->vcc = entry->vcc; 1869 tmp->old_push = entry->old_push; 1870 tmp->last_used = jiffies; 1871 del_timer(&entry->timer); 1872 lec_arp_put(entry); 1873 entry = tmp; 1874 } else { 1875 entry->status = ESI_FORWARD_DIRECT; 1876 ether_addr_copy(entry->mac_addr, 1877 mac_addr); 1878 entry->last_used = jiffies; 1879 lec_arp_add(priv, entry); 1880 } 1881 if (remoteflag) 1882 entry->flags |= LEC_REMOTE_FLAG; 1883 else 1884 entry->flags &= ~LEC_REMOTE_FLAG; 1885 pr_debug("After update\n"); 1886 dump_arp_table(priv); 1887 goto out; 1888 } 1889 } 1890 } 1891 1892 entry = lec_arp_find(priv, mac_addr); 1893 if (!entry) { 1894 entry = make_entry(priv, mac_addr); 1895 if (!entry) 1896 goto out; 1897 entry->status = ESI_UNKNOWN; 1898 lec_arp_add(priv, entry); 1899 /* Temporary, changes before end of function */ 1900 } 1901 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN); 1902 del_timer(&entry->timer); 1903 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 1904 hlist_for_each_entry(tmp, 1905 &priv->lec_arp_tables[i], next) { 1906 if (entry != tmp && 1907 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) { 1908 /* Vcc to this host exists */ 1909 if (tmp->status > ESI_VC_PENDING) { 1910 /* 1911 * ESI_FLUSH_PENDING, 1912 * ESI_FORWARD_DIRECT 1913 */ 1914 entry->vcc = tmp->vcc; 1915 entry->old_push = tmp->old_push; 1916 } 1917 entry->status = tmp->status; 1918 break; 1919 } 1920 } 1921 } 1922 if (remoteflag) 1923 entry->flags |= LEC_REMOTE_FLAG; 1924 else 1925 entry->flags &= ~LEC_REMOTE_FLAG; 1926 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) { 1927 entry->status = ESI_VC_PENDING; 1928 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL); 1929 } 1930 pr_debug("After update2\n"); 1931 dump_arp_table(priv); 1932 out: 1933 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 1934 } 1935 1936 /* 1937 * Notifies: Vcc setup ready 1938 */ 1939 static void 1940 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data, 1941 struct atm_vcc *vcc, 1942 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb)) 1943 { 1944 unsigned long flags; 1945 struct lec_arp_table *entry; 1946 int i, found_entry = 0; 1947 1948 spin_lock_irqsave(&priv->lec_arp_lock, flags); 1949 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */ 1950 if (ioc_data->receive == 2) { 1951 pr_debug("LEC_ARP: Attaching mcast forward\n"); 1952 #if 0 1953 entry = lec_arp_find(priv, bus_mac); 1954 if (!entry) { 1955 pr_info("LEC_ARP: Multicast entry not found!\n"); 1956 goto out; 1957 } 1958 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1959 entry->recv_vcc = vcc; 1960 entry->old_recv_push = old_push; 1961 #endif 1962 entry = make_entry(priv, bus_mac); 1963 if (entry == NULL) 1964 goto out; 1965 del_timer(&entry->timer); 1966 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1967 entry->recv_vcc = vcc; 1968 entry->old_recv_push = old_push; 1969 hlist_add_head(&entry->next, &priv->mcast_fwds); 1970 goto out; 1971 } else if (ioc_data->receive == 1) { 1972 /* 1973 * Vcc which we don't want to make default vcc, 1974 * attach it anyway. 1975 */ 1976 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", 1977 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 1978 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 1979 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 1980 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 1981 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 1982 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 1983 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 1984 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 1985 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 1986 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 1987 entry = make_entry(priv, bus_mac); 1988 if (entry == NULL) 1989 goto out; 1990 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 1991 eth_zero_addr(entry->mac_addr); 1992 entry->recv_vcc = vcc; 1993 entry->old_recv_push = old_push; 1994 entry->status = ESI_UNKNOWN; 1995 entry->timer.expires = jiffies + priv->vcc_timeout_period; 1996 entry->timer.function = lec_arp_expire_vcc; 1997 hlist_add_head(&entry->next, &priv->lec_no_forward); 1998 add_timer(&entry->timer); 1999 dump_arp_table(priv); 2000 goto out; 2001 } 2002 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", 2003 ioc_data->atm_addr[0], ioc_data->atm_addr[1], 2004 ioc_data->atm_addr[2], ioc_data->atm_addr[3], 2005 ioc_data->atm_addr[4], ioc_data->atm_addr[5], 2006 ioc_data->atm_addr[6], ioc_data->atm_addr[7], 2007 ioc_data->atm_addr[8], ioc_data->atm_addr[9], 2008 ioc_data->atm_addr[10], ioc_data->atm_addr[11], 2009 ioc_data->atm_addr[12], ioc_data->atm_addr[13], 2010 ioc_data->atm_addr[14], ioc_data->atm_addr[15], 2011 ioc_data->atm_addr[16], ioc_data->atm_addr[17], 2012 ioc_data->atm_addr[18], ioc_data->atm_addr[19]); 2013 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2014 hlist_for_each_entry(entry, 2015 &priv->lec_arp_tables[i], next) { 2016 if (memcmp 2017 (ioc_data->atm_addr, entry->atm_addr, 2018 ATM_ESA_LEN) == 0) { 2019 pr_debug("LEC_ARP: Attaching data direct\n"); 2020 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n", 2021 entry->vcc ? entry->vcc->vci : 0, 2022 entry->recv_vcc ? entry->recv_vcc-> 2023 vci : 0); 2024 found_entry = 1; 2025 del_timer(&entry->timer); 2026 entry->vcc = vcc; 2027 entry->old_push = old_push; 2028 if (entry->status == ESI_VC_PENDING) { 2029 if (priv->maximum_unknown_frame_count 2030 == 0) 2031 entry->status = 2032 ESI_FORWARD_DIRECT; 2033 else { 2034 entry->timestamp = jiffies; 2035 entry->status = 2036 ESI_FLUSH_PENDING; 2037 #if 0 2038 send_to_lecd(priv, l_flush_xmt, 2039 NULL, 2040 entry->atm_addr, 2041 NULL); 2042 #endif 2043 } 2044 } else { 2045 /* 2046 * They were forming a connection 2047 * to us, and we to them. Our 2048 * ATM address is numerically lower 2049 * than theirs, so we make connection 2050 * we formed into default VCC (8.1.11). 2051 * Connection they made gets torn 2052 * down. This might confuse some 2053 * clients. Can be changed if 2054 * someone reports trouble... 2055 */ 2056 ; 2057 } 2058 } 2059 } 2060 } 2061 if (found_entry) { 2062 pr_debug("After vcc was added\n"); 2063 dump_arp_table(priv); 2064 goto out; 2065 } 2066 /* 2067 * Not found, snatch address from first data packet that arrives 2068 * from this vcc 2069 */ 2070 entry = make_entry(priv, bus_mac); 2071 if (!entry) 2072 goto out; 2073 entry->vcc = vcc; 2074 entry->old_push = old_push; 2075 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN); 2076 eth_zero_addr(entry->mac_addr); 2077 entry->status = ESI_UNKNOWN; 2078 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones); 2079 entry->timer.expires = jiffies + priv->vcc_timeout_period; 2080 entry->timer.function = lec_arp_expire_vcc; 2081 add_timer(&entry->timer); 2082 pr_debug("After vcc was added\n"); 2083 dump_arp_table(priv); 2084 out: 2085 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2086 } 2087 2088 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id) 2089 { 2090 unsigned long flags; 2091 struct lec_arp_table *entry; 2092 int i; 2093 2094 pr_debug("%lx\n", tran_id); 2095 restart: 2096 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2097 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2098 hlist_for_each_entry(entry, 2099 &priv->lec_arp_tables[i], next) { 2100 if (entry->flush_tran_id == tran_id && 2101 entry->status == ESI_FLUSH_PENDING) { 2102 struct sk_buff *skb; 2103 struct atm_vcc *vcc = entry->vcc; 2104 2105 lec_arp_hold(entry); 2106 spin_unlock_irqrestore(&priv->lec_arp_lock, 2107 flags); 2108 while ((skb = skb_dequeue(&entry->tx_wait))) 2109 lec_send(vcc, skb); 2110 entry->last_used = jiffies; 2111 entry->status = ESI_FORWARD_DIRECT; 2112 lec_arp_put(entry); 2113 pr_debug("LEC_ARP: Flushed\n"); 2114 goto restart; 2115 } 2116 } 2117 } 2118 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2119 dump_arp_table(priv); 2120 } 2121 2122 static void 2123 lec_set_flush_tran_id(struct lec_priv *priv, 2124 const unsigned char *atm_addr, unsigned long tran_id) 2125 { 2126 unsigned long flags; 2127 struct lec_arp_table *entry; 2128 int i; 2129 2130 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2131 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) 2132 hlist_for_each_entry(entry, 2133 &priv->lec_arp_tables[i], next) { 2134 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) { 2135 entry->flush_tran_id = tran_id; 2136 pr_debug("Set flush transaction id to %lx for %p\n", 2137 tran_id, entry); 2138 } 2139 } 2140 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2141 } 2142 2143 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc) 2144 { 2145 unsigned long flags; 2146 unsigned char mac_addr[] = { 2147 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 2148 }; 2149 struct lec_arp_table *to_add; 2150 struct lec_vcc_priv *vpriv; 2151 int err = 0; 2152 2153 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL); 2154 if (!vpriv) 2155 return -ENOMEM; 2156 vpriv->xoff = 0; 2157 vpriv->old_pop = vcc->pop; 2158 vcc->user_back = vpriv; 2159 vcc->pop = lec_pop; 2160 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2161 to_add = make_entry(priv, mac_addr); 2162 if (!to_add) { 2163 vcc->pop = vpriv->old_pop; 2164 kfree(vpriv); 2165 err = -ENOMEM; 2166 goto out; 2167 } 2168 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN); 2169 to_add->status = ESI_FORWARD_DIRECT; 2170 to_add->flags |= LEC_PERMANENT_FLAG; 2171 to_add->vcc = vcc; 2172 to_add->old_push = vcc->push; 2173 vcc->push = lec_push; 2174 priv->mcast_vcc = vcc; 2175 lec_arp_add(priv, to_add); 2176 out: 2177 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2178 return err; 2179 } 2180 2181 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc) 2182 { 2183 unsigned long flags; 2184 struct hlist_node *next; 2185 struct lec_arp_table *entry; 2186 int i; 2187 2188 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci); 2189 dump_arp_table(priv); 2190 2191 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2192 2193 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) { 2194 hlist_for_each_entry_safe(entry, next, 2195 &priv->lec_arp_tables[i], next) { 2196 if (vcc == entry->vcc) { 2197 lec_arp_remove(priv, entry); 2198 lec_arp_put(entry); 2199 if (priv->mcast_vcc == vcc) 2200 priv->mcast_vcc = NULL; 2201 } 2202 } 2203 } 2204 2205 hlist_for_each_entry_safe(entry, next, 2206 &priv->lec_arp_empty_ones, next) { 2207 if (entry->vcc == vcc) { 2208 lec_arp_clear_vccs(entry); 2209 del_timer(&entry->timer); 2210 hlist_del(&entry->next); 2211 lec_arp_put(entry); 2212 } 2213 } 2214 2215 hlist_for_each_entry_safe(entry, next, 2216 &priv->lec_no_forward, next) { 2217 if (entry->recv_vcc == vcc) { 2218 lec_arp_clear_vccs(entry); 2219 del_timer(&entry->timer); 2220 hlist_del(&entry->next); 2221 lec_arp_put(entry); 2222 } 2223 } 2224 2225 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) { 2226 if (entry->recv_vcc == vcc) { 2227 lec_arp_clear_vccs(entry); 2228 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */ 2229 hlist_del(&entry->next); 2230 lec_arp_put(entry); 2231 } 2232 } 2233 2234 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2235 dump_arp_table(priv); 2236 } 2237 2238 static void 2239 lec_arp_check_empties(struct lec_priv *priv, 2240 struct atm_vcc *vcc, struct sk_buff *skb) 2241 { 2242 unsigned long flags; 2243 struct hlist_node *next; 2244 struct lec_arp_table *entry, *tmp; 2245 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data; 2246 unsigned char *src = hdr->h_source; 2247 2248 spin_lock_irqsave(&priv->lec_arp_lock, flags); 2249 hlist_for_each_entry_safe(entry, next, 2250 &priv->lec_arp_empty_ones, next) { 2251 if (vcc == entry->vcc) { 2252 del_timer(&entry->timer); 2253 ether_addr_copy(entry->mac_addr, src); 2254 entry->status = ESI_FORWARD_DIRECT; 2255 entry->last_used = jiffies; 2256 /* We might have got an entry */ 2257 tmp = lec_arp_find(priv, src); 2258 if (tmp) { 2259 lec_arp_remove(priv, tmp); 2260 lec_arp_put(tmp); 2261 } 2262 hlist_del(&entry->next); 2263 lec_arp_add(priv, entry); 2264 goto out; 2265 } 2266 } 2267 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n"); 2268 out: 2269 spin_unlock_irqrestore(&priv->lec_arp_lock, flags); 2270 } 2271 2272 MODULE_LICENSE("GPL"); 2273