net/atm/lec.c

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