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