net/atm/lec.c

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