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