SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9 #include <linux/kernel.h>
  10 #include <linux/bitops.h>
  11 #include <linux/capability.h>
  12
  13 /* We are ethernet device */
  14 #include <linux/if_ether.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <net/sock.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/ip.h>
  20 #include <asm/byteorder.h>
  21 #include <linux/uaccess.h>
  22 #include <net/arp.h>
  23 #include <net/dst.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/seq_file.h>
  27
  28 /* TokenRing if needed */
  29 #ifdef CONFIG_TR
  30 #include <linux/trdevice.h>
  31 #endif
  32
  33 /* And atm device */
  34 #include <linux/atmdev.h>
  35 #include <linux/atmlec.h>
  36
  37 /* Proxy LEC knows about bridging */
  38 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  39 #include "../bridge/br_private.h"
  40
  41 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  42 #endif
  43
  44 /* Modular too */
  45 #include <linux/module.h>
  46 #include <linux/init.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         atomic_inc(&entry->usage);
 109 }
 110
 111 static inline void lec_arp_put(struct lec_arp_table *entry)
 112 {
 113         if (atomic_dec_and_test(&entry->usage))
 114                 kfree(entry);
 115 }
 116
 117 static struct lane2_ops lane2_ops = {
 118         lane2_resolve,          /* resolve,             spec 3.1.3 */
 119         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 120         NULL                    /* associate indicator, 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 defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 130 {
 131         struct ethhdr *eth;
 132         char *buff;
 133         struct lec_priv *priv;
 134
 135         /*
 136          * Check if this is a BPDU. If so, ask zeppelin to send
 137          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 138          * as the Config BPDU has
 139          */
 140         eth = (struct ethhdr *)skb->data;
 141         buff = skb->data + skb->dev->hard_header_len;
 142         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 143                 struct sock *sk;
 144                 struct sk_buff *skb2;
 145                 struct atmlec_msg *mesg;
 146
 147                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 148                 if (skb2 == NULL)
 149                         return;
 150                 skb2->len = sizeof(struct atmlec_msg);
 151                 mesg = (struct atmlec_msg *)skb2->data;
 152                 mesg->type = l_topology_change;
 153                 buff += 4;
 154                 mesg->content.normal.flag = *buff & 0x01;
 155                                         /* 0x01 is topology change */
 156
 157                 priv = netdev_priv(dev);
 158                 atm_force_charge(priv->lecd, skb2->truesize);
 159                 sk = sk_atm(priv->lecd);
 160                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 161                 sk->sk_data_ready(sk, skb2->len);
 162         }
 163
 164         return;
 165 }
 166 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 167
 168 /*
 169  * Modelled after tr_type_trans
 170  * All multicast and ARE or STE frames go to BUS.
 171  * Non source routed frames go by destination address.
 172  * Last hop source routed frames go by destination address.
 173  * Not last hop source routed frames go by _next_ route descriptor.
 174  * Returns pointer to destination MAC address or fills in rdesc
 175  * and returns NULL.
 176  */
 177 #ifdef CONFIG_TR
 178 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 179 {
 180         struct trh_hdr *trh;
 181         unsigned int riflen, num_rdsc;
 182
 183         trh = (struct trh_hdr *)packet;
 184         if (trh->daddr[0] & (uint8_t) 0x80)
 185                 return bus_mac; /* multicast */
 186
 187         if (trh->saddr[0] & TR_RII) {
 188                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 189                 if ((ntohs(trh->rcf) >> 13) != 0)
 190                         return bus_mac; /* ARE or STE */
 191         } else
 192                 return trh->daddr;      /* not source routed */
 193
 194         if (riflen < 6)
 195                 return trh->daddr;      /* last hop, source routed */
 196
 197         /* riflen is 6 or more, packet has more than one route descriptor */
 198         num_rdsc = (riflen / 2) - 1;
 199         memset(rdesc, 0, ETH_ALEN);
 200         /* offset 4 comes from LAN destination field in LE control frames */
 201         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 202                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 203         else {
 204                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 205                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 206         }
 207
 208         return NULL;
 209 }
 210 #endif /* CONFIG_TR */
 211
 212 /*
 213  * Open/initialize the netdevice. This is called (in the current kernel)
 214  * sometime after booting when the 'ifconfig' program is run.
 215  *
 216  * This routine should set everything up anew at each open, even
 217  * registers that "should" only need to be set once at boot, so that
 218  * there is non-reboot way to recover if something goes wrong.
 219  */
 220
 221 static int lec_open(struct net_device *dev)
 222 {
 223         netif_start_queue(dev);
 224         memset(&dev->stats, 0, sizeof(struct net_device_stats));
 225
 226         return 0;
 227 }
 228
 229 static void
 230 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 231 {
 232         struct net_device *dev = skb->dev;
 233
 234         ATM_SKB(skb)->vcc = vcc;
 235         ATM_SKB(skb)->atm_options = vcc->atm_options;
 236
 237         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 238         if (vcc->send(vcc, skb) < 0) {
 239                 dev->stats.tx_dropped++;
 240                 return;
 241         }
 242
 243         dev->stats.tx_packets++;
 244         dev->stats.tx_bytes += skb->len;
 245 }
 246
 247 static void lec_tx_timeout(struct net_device *dev)
 248 {
 249         pr_info("%s\n", dev->name);
 250         dev->trans_start = jiffies;
 251         netif_wake_queue(dev);
 252 }
 253
 254 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 255                                   struct net_device *dev)
 256 {
 257         struct sk_buff *skb2;
 258         struct lec_priv *priv = netdev_priv(dev);
 259         struct lecdatahdr_8023 *lec_h;
 260         struct atm_vcc *vcc;
 261         struct lec_arp_table *entry;
 262         unsigned char *dst;
 263         int min_frame_size;
 264 #ifdef CONFIG_TR
 265         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 266 #endif
 267         int is_rdesc;
 268
 269         pr_debug("called\n");
 270         if (!priv->lecd) {
 271                 pr_info("%s:No lecd attached\n", dev->name);
 272                 dev->stats.tx_errors++;
 273                 netif_stop_queue(dev);
 274                 kfree_skb(skb);
 275                 return NETDEV_TX_OK;
 276         }
 277
 278         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 279                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 280                  (long)skb_end_pointer(skb));
 281 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 282         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 283                 lec_handle_bridge(skb, dev);
 284 #endif
 285
 286         /* Make sure we have room for lec_id */
 287         if (skb_headroom(skb) < 2) {
 288                 pr_debug("reallocating skb\n");
 289                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 290                 kfree_skb(skb);
 291                 if (skb2 == NULL)
 292                         return NETDEV_TX_OK;
 293                 skb = skb2;
 294         }
 295         skb_push(skb, 2);
 296
 297         /* Put le header to place, works for TokenRing too */
 298         lec_h = (struct lecdatahdr_8023 *)skb->data;
 299         lec_h->le_header = htons(priv->lecid);
 300
 301 #ifdef CONFIG_TR
 302         /*
 303          * Ugly. Use this to realign Token Ring packets for
 304          * e.g. PCA-200E driver.
 305          */
 306         if (priv->is_trdev) {
 307                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 308                 kfree_skb(skb);
 309                 if (skb2 == NULL)
 310                         return NETDEV_TX_OK;
 311                 skb = skb2;
 312         }
 313 #endif
 314
 315 #if DUMP_PACKETS >= 2
 316 #define MAX_DUMP_SKB 99
 317 #elif DUMP_PACKETS >= 1
 318 #define MAX_DUMP_SKB 30
 319 #endif
 320 #if DUMP_PACKETS >= 1
 321         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 322                dev->name, skb->len, priv->lecid);
 323         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 324                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 325 #endif /* DUMP_PACKETS >= 1 */
 326
 327         /* Minimum ethernet-frame size */
 328 #ifdef CONFIG_TR
 329         if (priv->is_trdev)
 330                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 331         else
 332 #endif
 333                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 334         if (skb->len < min_frame_size) {
 335                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 336                         skb2 = skb_copy_expand(skb, 0,
 337                                                min_frame_size - skb->truesize,
 338                                                GFP_ATOMIC);
 339                         dev_kfree_skb(skb);
 340                         if (skb2 == NULL) {
 341                                 dev->stats.tx_dropped++;
 342                                 return NETDEV_TX_OK;
 343                         }
 344                         skb = skb2;
 345                 }
 346                 skb_put(skb, min_frame_size - skb->len);
 347         }
 348
 349         /* Send to right vcc */
 350         is_rdesc = 0;
 351         dst = lec_h->h_dest;
 352 #ifdef CONFIG_TR
 353         if (priv->is_trdev) {
 354                 dst = get_tr_dst(skb->data + 2, rdesc);
 355                 if (dst == NULL) {
 356                         dst = rdesc;
 357                         is_rdesc = 1;
 358                 }
 359         }
 360 #endif
 361         entry = NULL;
 362         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 363         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 364                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 365         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 366                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 367                         pr_debug("%s:queuing packet, MAC address %pM\n",
 368                                  dev->name, lec_h->h_dest);
 369                         skb_queue_tail(&entry->tx_wait, skb);
 370                 } else {
 371                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 372                                  dev->name, lec_h->h_dest);
 373                         dev->stats.tx_dropped++;
 374                         dev_kfree_skb(skb);
 375                 }
 376                 goto out;
 377         }
 378 #if DUMP_PACKETS > 0
 379         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 380                dev->name, vcc->vpi, vcc->vci);
 381 #endif /* DUMP_PACKETS > 0 */
 382
 383         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 384                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 385                 lec_send(vcc, skb2);
 386         }
 387
 388         lec_send(vcc, skb);
 389
 390         if (!atm_may_send(vcc, 0)) {
 391                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 392
 393                 vpriv->xoff = 1;
 394                 netif_stop_queue(dev);
 395
 396                 /*
 397                  * vcc->pop() might have occurred in between, making
 398                  * the vcc usuable again.  Since xmit is serialized,
 399                  * this is the only situation we have to re-test.
 400                  */
 401
 402                 if (atm_may_send(vcc, 0))
 403                         netif_wake_queue(dev);
 404         }
 405
 406 out:
 407         if (entry)
 408                 lec_arp_put(entry);
 409         dev->trans_start = jiffies;
 410         return NETDEV_TX_OK;
 411 }
 412
 413 /* The inverse routine to net_open(). */
 414 static int lec_close(struct net_device *dev)
 415 {
 416         netif_stop_queue(dev);
 417         return 0;
 418 }
 419
 420 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 421 {
 422         unsigned long flags;
 423         struct net_device *dev = (struct net_device *)vcc->proto_data;
 424         struct lec_priv *priv = netdev_priv(dev);
 425         struct atmlec_msg *mesg;
 426         struct lec_arp_table *entry;
 427         int i;
 428         char *tmp;              /* FIXME */
 429
 430         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 431         mesg = (struct atmlec_msg *)skb->data;
 432         tmp = skb->data;
 433         tmp += sizeof(struct atmlec_msg);
 434         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 435         switch (mesg->type) {
 436         case l_set_mac_addr:
 437                 for (i = 0; i < 6; i++)
 438                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 439                 break;
 440         case l_del_mac_addr:
 441                 for (i = 0; i < 6; i++)
 442                         dev->dev_addr[i] = 0;
 443                 break;
 444         case l_addr_delete:
 445                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 446                                 mesg->content.normal.flag);
 447                 break;
 448         case l_topology_change:
 449                 priv->topology_change = mesg->content.normal.flag;
 450                 break;
 451         case l_flush_complete:
 452                 lec_flush_complete(priv, mesg->content.normal.flag);
 453                 break;
 454         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 455                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 456                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 457                 lec_arp_remove(priv, entry);
 458                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 459
 460                 if (mesg->content.normal.no_source_le_narp)
 461                         break;
 462                 /* FALL THROUGH */
 463         case l_arp_update:
 464                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 465                                mesg->content.normal.atm_addr,
 466                                mesg->content.normal.flag,
 467                                mesg->content.normal.targetless_le_arp);
 468                 pr_debug("in l_arp_update\n");
 469                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 470                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 471                                  mesg->sizeoftlvs);
 472                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 473                                             tmp, mesg->sizeoftlvs);
 474                 }
 475                 break;
 476         case l_config:
 477                 priv->maximum_unknown_frame_count =
 478                     mesg->content.config.maximum_unknown_frame_count;
 479                 priv->max_unknown_frame_time =
 480                     (mesg->content.config.max_unknown_frame_time * HZ);
 481                 priv->max_retry_count = mesg->content.config.max_retry_count;
 482                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 483                 priv->forward_delay_time =
 484                     (mesg->content.config.forward_delay_time * HZ);
 485                 priv->arp_response_time =
 486                     (mesg->content.config.arp_response_time * HZ);
 487                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 488                 priv->path_switching_delay =
 489                     (mesg->content.config.path_switching_delay * HZ);
 490                 priv->lane_version = mesg->content.config.lane_version;
 491                                         /* LANE2 */
 492                 priv->lane2_ops = NULL;
 493                 if (priv->lane_version > 1)
 494                         priv->lane2_ops = &lane2_ops;
 495                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 496                         pr_info("%s: change_mtu to %d failed\n",
 497                                 dev->name, mesg->content.config.mtu);
 498                 priv->is_proxy = mesg->content.config.is_proxy;
 499                 break;
 500         case l_flush_tran_id:
 501                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 502                                       mesg->content.normal.flag);
 503                 break;
 504         case l_set_lecid:
 505                 priv->lecid =
 506                     (unsigned short)(0xffff & mesg->content.normal.flag);
 507                 break;
 508         case l_should_bridge:
 509 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 510         {
 511                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 512                          dev->name, mesg->content.proxy.mac_addr);
 513
 514                 if (br_fdb_test_addr_hook == NULL)
 515                         break;
 516
 517                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 518                         /* hit from bridge table, send LE_ARP_RESPONSE */
 519                         struct sk_buff *skb2;
 520                         struct sock *sk;
 521
 522                         pr_debug("%s: entry found, responding to zeppelin\n",
 523                                  dev->name);
 524                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 525                         if (skb2 == NULL)
 526                                 break;
 527                         skb2->len = sizeof(struct atmlec_msg);
 528                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 529                         atm_force_charge(priv->lecd, skb2->truesize);
 530                         sk = sk_atm(priv->lecd);
 531                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 532                         sk->sk_data_ready(sk, skb2->len);
 533                 }
 534         }
 535 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 536                 break;
 537         default:
 538                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 539                 dev_kfree_skb(skb);
 540                 return -EINVAL;
 541         }
 542         dev_kfree_skb(skb);
 543         return 0;
 544 }
 545
 546 static void lec_atm_close(struct atm_vcc *vcc)
 547 {
 548         struct sk_buff *skb;
 549         struct net_device *dev = (struct net_device *)vcc->proto_data;
 550         struct lec_priv *priv = netdev_priv(dev);
 551
 552         priv->lecd = NULL;
 553         /* Do something needful? */
 554
 555         netif_stop_queue(dev);
 556         lec_arp_destroy(priv);
 557
 558         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 559                 pr_info("%s closing with messages pending\n", dev->name);
 560         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 561                 atm_return(vcc, skb->truesize);
 562                 dev_kfree_skb(skb);
 563         }
 564
 565         pr_info("%s: Shut down!\n", dev->name);
 566         module_put(THIS_MODULE);
 567 }
 568
 569 static struct atmdev_ops lecdev_ops = {
 570         .close = lec_atm_close,
 571         .send = lec_atm_send
 572 };
 573
 574 static struct atm_dev lecatm_dev = {
 575         .ops = &lecdev_ops,
 576         .type = "lec",
 577         .number = 999,          /* dummy device number */
 578         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 579 };
 580
 581 /*
 582  * LANE2: new argument struct sk_buff *data contains
 583  * the LE_ARP based TLVs introduced in the LANE2 spec
 584  */
 585 static int
 586 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 587              const unsigned char *mac_addr, const unsigned char *atm_addr,
 588              struct sk_buff *data)
 589 {
 590         struct sock *sk;
 591         struct sk_buff *skb;
 592         struct atmlec_msg *mesg;
 593
 594         if (!priv || !priv->lecd)
 595                 return -1;
 596         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 597         if (!skb)
 598                 return -1;
 599         skb->len = sizeof(struct atmlec_msg);
 600         mesg = (struct atmlec_msg *)skb->data;
 601         memset(mesg, 0, sizeof(struct atmlec_msg));
 602         mesg->type = type;
 603         if (data != NULL)
 604                 mesg->sizeoftlvs = data->len;
 605         if (mac_addr)
 606                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 607         else
 608                 mesg->content.normal.targetless_le_arp = 1;
 609         if (atm_addr)
 610                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 611
 612         atm_force_charge(priv->lecd, skb->truesize);
 613         sk = sk_atm(priv->lecd);
 614         skb_queue_tail(&sk->sk_receive_queue, skb);
 615         sk->sk_data_ready(sk, skb->len);
 616
 617         if (data != NULL) {
 618                 pr_debug("about to send %d bytes of data\n", data->len);
 619                 atm_force_charge(priv->lecd, data->truesize);
 620                 skb_queue_tail(&sk->sk_receive_queue, data);
 621                 sk->sk_data_ready(sk, skb->len);
 622         }
 623
 624         return 0;
 625 }
 626
 627 /* shamelessly stolen from drivers/net/net_init.c */
 628 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 629 {
 630         if ((new_mtu < 68) || (new_mtu > 18190))
 631                 return -EINVAL;
 632         dev->mtu = new_mtu;
 633         return 0;
 634 }
 635
 636 static void lec_set_multicast_list(struct net_device *dev)
 637 {
 638         /*
 639          * by default, all multicast frames arrive over the bus.
 640          * eventually support selective multicast service
 641          */
 642         return;
 643 }
 644
 645 static const struct net_device_ops lec_netdev_ops = {
 646         .ndo_open               = lec_open,
 647         .ndo_stop               = lec_close,
 648         .ndo_start_xmit         = lec_start_xmit,
 649         .ndo_change_mtu         = lec_change_mtu,
 650         .ndo_tx_timeout         = lec_tx_timeout,
 651         .ndo_set_multicast_list = lec_set_multicast_list,
 652 };
 653
 654 static const unsigned char lec_ctrl_magic[] = {
 655         0xff,
 656         0x00,
 657         0x01,
 658         0x01
 659 };
 660
 661 #define LEC_DATA_DIRECT_8023  2
 662 #define LEC_DATA_DIRECT_8025  3
 663
 664 static int lec_is_data_direct(struct atm_vcc *vcc)
 665 {
 666         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 667                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 668 }
 669
 670 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 671 {
 672         unsigned long flags;
 673         struct net_device *dev = (struct net_device *)vcc->proto_data;
 674         struct lec_priv *priv = netdev_priv(dev);
 675
 676 #if DUMP_PACKETS > 0
 677         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 678                dev->name, vcc->vpi, vcc->vci);
 679 #endif
 680         if (!skb) {
 681                 pr_debug("%s: null skb\n", dev->name);
 682                 lec_vcc_close(priv, vcc);
 683                 return;
 684         }
 685 #if DUMP_PACKETS >= 2
 686 #define MAX_SKB_DUMP 99
 687 #elif DUMP_PACKETS >= 1
 688 #define MAX_SKB_DUMP 30
 689 #endif
 690 #if DUMP_PACKETS > 0
 691         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 692                dev->name, skb->len, priv->lecid);
 693         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 694                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 695 #endif /* DUMP_PACKETS > 0 */
 696         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 697                                 /* Control frame, to daemon */
 698                 struct sock *sk = sk_atm(vcc);
 699
 700                 pr_debug("%s: To daemon\n", dev->name);
 701                 skb_queue_tail(&sk->sk_receive_queue, skb);
 702                 sk->sk_data_ready(sk, skb->len);
 703         } else {                /* Data frame, queue to protocol handlers */
 704                 struct lec_arp_table *entry;
 705                 unsigned char *src, *dst;
 706
 707                 atm_return(vcc, skb->truesize);
 708                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 709                     !priv->lecd || !(dev->flags & IFF_UP)) {
 710                         /*
 711                          * Probably looping back, or if lecd is missing,
 712                          * lecd has gone down
 713                          */
 714                         pr_debug("Ignoring frame...\n");
 715                         dev_kfree_skb(skb);
 716                         return;
 717                 }
 718 #ifdef CONFIG_TR
 719                 if (priv->is_trdev)
 720                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 721                 else
 722 #endif
 723                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 724
 725                 /*
 726                  * If this is a Data Direct VCC, and the VCC does not match
 727                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 728                  */
 729                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 730                 if (lec_is_data_direct(vcc)) {
 731 #ifdef CONFIG_TR
 732                         if (priv->is_trdev)
 733                                 src =
 734                                     ((struct lecdatahdr_8025 *)skb->data)->
 735                                     h_source;
 736                         else
 737 #endif
 738                                 src =
 739                                     ((struct lecdatahdr_8023 *)skb->data)->
 740                                     h_source;
 741                         entry = lec_arp_find(priv, src);
 742                         if (entry && entry->vcc != vcc) {
 743                                 lec_arp_remove(priv, entry);
 744                                 lec_arp_put(entry);
 745                         }
 746                 }
 747                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 748
 749                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 750                     !priv->is_proxy &&  /* Proxy wants all the packets */
 751                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 752                         dev_kfree_skb(skb);
 753                         return;
 754                 }
 755                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 756                         lec_arp_check_empties(priv, vcc, skb);
 757                 skb_pull(skb, 2);       /* skip lec_id */
 758 #ifdef CONFIG_TR
 759                 if (priv->is_trdev)
 760                         skb->protocol = tr_type_trans(skb, dev);
 761                 else
 762 #endif
 763                         skb->protocol = eth_type_trans(skb, dev);
 764                 dev->stats.rx_packets++;
 765                 dev->stats.rx_bytes += skb->len;
 766                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 767                 netif_rx(skb);
 768         }
 769 }
 770
 771 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 772 {
 773         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 774         struct net_device *dev = skb->dev;
 775
 776         if (vpriv == NULL) {
 777                 pr_info("vpriv = NULL!?!?!?\n");
 778                 return;
 779         }
 780
 781         vpriv->old_pop(vcc, skb);
 782
 783         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 784                 vpriv->xoff = 0;
 785                 if (netif_running(dev) && netif_queue_stopped(dev))
 786                         netif_wake_queue(dev);
 787         }
 788 }
 789
 790 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 791 {
 792         struct lec_vcc_priv *vpriv;
 793         int bytes_left;
 794         struct atmlec_ioc ioc_data;
 795
 796         /* Lecd must be up in this case */
 797         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 798         if (bytes_left != 0)
 799                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 800         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 801             !dev_lec[ioc_data.dev_num])
 802                 return -EINVAL;
 803         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 804         if (!vpriv)
 805                 return -ENOMEM;
 806         vpriv->xoff = 0;
 807         vpriv->old_pop = vcc->pop;
 808         vcc->user_back = vpriv;
 809         vcc->pop = lec_pop;
 810         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 811                       &ioc_data, vcc, vcc->push);
 812         vcc->proto_data = dev_lec[ioc_data.dev_num];
 813         vcc->push = lec_push;
 814         return 0;
 815 }
 816
 817 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 818 {
 819         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 820                 return -EINVAL;
 821         vcc->proto_data = dev_lec[arg];
 822         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 823                                 vcc);
 824 }
 825
 826 /* Initialize device. */
 827 static int lecd_attach(struct atm_vcc *vcc, int arg)
 828 {
 829         int i;
 830         struct lec_priv *priv;
 831
 832         if (arg < 0)
 833                 i = 0;
 834         else
 835                 i = arg;
 836 #ifdef CONFIG_TR
 837         if (arg >= MAX_LEC_ITF)
 838                 return -EINVAL;
 839 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 840         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 841                 return -EINVAL;
 842 #endif
 843         if (!dev_lec[i]) {
 844                 int is_trdev, size;
 845
 846                 is_trdev = 0;
 847                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 848                         is_trdev = 1;
 849
 850                 size = sizeof(struct lec_priv);
 851 #ifdef CONFIG_TR
 852                 if (is_trdev)
 853                         dev_lec[i] = alloc_trdev(size);
 854                 else
 855 #endif
 856                         dev_lec[i] = alloc_etherdev(size);
 857                 if (!dev_lec[i])
 858                         return -ENOMEM;
 859                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 860                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 861                 if (register_netdev(dev_lec[i])) {
 862                         free_netdev(dev_lec[i]);
 863                         return -EINVAL;
 864                 }
 865
 866                 priv = netdev_priv(dev_lec[i]);
 867                 priv->is_trdev = is_trdev;
 868         } else {
 869                 priv = netdev_priv(dev_lec[i]);
 870                 if (priv->lecd)
 871                         return -EADDRINUSE;
 872         }
 873         lec_arp_init(priv);
 874         priv->itfnum = i;       /* LANE2 addition */
 875         priv->lecd = vcc;
 876         vcc->dev = &lecatm_dev;
 877         vcc_insert_socket(sk_atm(vcc));
 878
 879         vcc->proto_data = dev_lec[i];
 880         set_bit(ATM_VF_META, &vcc->flags);
 881         set_bit(ATM_VF_READY, &vcc->flags);
 882
 883         /* Set default values to these variables */
 884         priv->maximum_unknown_frame_count = 1;
 885         priv->max_unknown_frame_time = (1 * HZ);
 886         priv->vcc_timeout_period = (1200 * HZ);
 887         priv->max_retry_count = 1;
 888         priv->aging_time = (300 * HZ);
 889         priv->forward_delay_time = (15 * HZ);
 890         priv->topology_change = 0;
 891         priv->arp_response_time = (1 * HZ);
 892         priv->flush_timeout = (4 * HZ);
 893         priv->path_switching_delay = (6 * HZ);
 894
 895         if (dev_lec[i]->flags & IFF_UP)
 896                 netif_start_queue(dev_lec[i]);
 897         __module_get(THIS_MODULE);
 898         return i;
 899 }
 900
 901 #ifdef CONFIG_PROC_FS
 902 static const char *lec_arp_get_status_string(unsigned char status)
 903 {
 904         static const char *const lec_arp_status_string[] = {
 905                 "ESI_UNKNOWN       ",
 906                 "ESI_ARP_PENDING   ",
 907                 "ESI_VC_PENDING    ",
 908                 "<Undefined>       ",
 909                 "ESI_FLUSH_PENDING ",
 910                 "ESI_FORWARD_DIRECT"
 911         };
 912
 913         if (status > ESI_FORWARD_DIRECT)
 914                 status = 3;     /* ESI_UNDEFINED */
 915         return lec_arp_status_string[status];
 916 }
 917
 918 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 919 {
 920         int i;
 921
 922         for (i = 0; i < ETH_ALEN; i++)
 923                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 924         seq_printf(seq, " ");
 925         for (i = 0; i < ATM_ESA_LEN; i++)
 926                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 927         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 928                    entry->flags & 0xffff);
 929         if (entry->vcc)
 930                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 931         else
 932                 seq_printf(seq, "        ");
 933         if (entry->recv_vcc) {
 934                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 935                            entry->recv_vcc->vci);
 936         }
 937         seq_putc(seq, '\n');
 938 }
 939
 940 struct lec_state {
 941         unsigned long flags;
 942         struct lec_priv *locked;
 943         struct hlist_node *node;
 944         struct net_device *dev;
 945         int itf;
 946         int arp_table;
 947         int misc_table;
 948 };
 949
 950 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 951                           loff_t *l)
 952 {
 953         struct hlist_node *e = state->node;
 954         struct lec_arp_table *tmp;
 955
 956         if (!e)
 957                 e = tbl->first;
 958         if (e == SEQ_START_TOKEN) {
 959                 e = tbl->first;
 960                 --*l;
 961         }
 962
 963         hlist_for_each_entry_from(tmp, e, next) {
 964                 if (--*l < 0)
 965                         break;
 966         }
 967         state->node = e;
 968
 969         return (*l < 0) ? state : NULL;
 970 }
 971
 972 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 973                           struct lec_priv *priv)
 974 {
 975         void *v = NULL;
 976         int p;
 977
 978         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 979                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 980                 if (v)
 981                         break;
 982         }
 983         state->arp_table = p;
 984         return v;
 985 }
 986
 987 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 988                            struct lec_priv *priv)
 989 {
 990         struct hlist_head *lec_misc_tables[] = {
 991                 &priv->lec_arp_empty_ones,
 992                 &priv->lec_no_forward,
 993                 &priv->mcast_fwds
 994         };
 995         void *v = NULL;
 996         int q;
 997
 998         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 999                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1000                 if (v)
1001                         break;
1002         }
1003         state->misc_table = q;
1004         return v;
1005 }
1006
1007 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1008                            struct lec_priv *priv)
1009 {
1010         if (!state->locked) {
1011                 state->locked = priv;
1012                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1013         }
1014         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1015                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1016                 state->locked = NULL;
1017                 /* Partial state reset for the next time we get called */
1018                 state->arp_table = state->misc_table = 0;
1019         }
1020         return state->locked;
1021 }
1022
1023 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1024 {
1025         struct net_device *dev;
1026         void *v;
1027
1028         dev = state->dev ? state->dev : dev_lec[state->itf];
1029         v = (dev && netdev_priv(dev)) ?
1030                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1031         if (!v && dev) {
1032                 dev_put(dev);
1033                 /* Partial state reset for the next time we get called */
1034                 dev = NULL;
1035         }
1036         state->dev = dev;
1037         return v;
1038 }
1039
1040 static void *lec_get_idx(struct lec_state *state, loff_t l)
1041 {
1042         void *v = NULL;
1043
1044         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1045                 v = lec_itf_walk(state, &l);
1046                 if (v)
1047                         break;
1048         }
1049         return v;
1050 }
1051
1052 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1053 {
1054         struct lec_state *state = seq->private;
1055
1056         state->itf = 0;
1057         state->dev = NULL;
1058         state->locked = NULL;
1059         state->arp_table = 0;
1060         state->misc_table = 0;
1061         state->node = SEQ_START_TOKEN;
1062
1063         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1064 }
1065
1066 static void lec_seq_stop(struct seq_file *seq, void *v)
1067 {
1068         struct lec_state *state = seq->private;
1069
1070         if (state->dev) {
1071                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1072                                        state->flags);
1073                 dev_put(state->dev);
1074         }
1075 }
1076
1077 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1078 {
1079         struct lec_state *state = seq->private;
1080
1081         v = lec_get_idx(state, 1);
1082         *pos += !!PTR_ERR(v);
1083         return v;
1084 }
1085
1086 static int lec_seq_show(struct seq_file *seq, void *v)
1087 {
1088         static const char lec_banner[] =
1089             "Itf  MAC          ATM destination"
1090             "                          Status            Flags "
1091             "VPI/VCI Recv VPI/VCI\n";
1092
1093         if (v == SEQ_START_TOKEN)
1094                 seq_puts(seq, lec_banner);
1095         else {
1096                 struct lec_state *state = seq->private;
1097                 struct net_device *dev = state->dev;
1098                 struct lec_arp_table *entry = hlist_entry(state->node,
1099                                                           struct lec_arp_table,
1100                                                           next);
1101
1102                 seq_printf(seq, "%s ", dev->name);
1103                 lec_info(seq, entry);
1104         }
1105         return 0;
1106 }
1107
1108 static const struct seq_operations lec_seq_ops = {
1109         .start = lec_seq_start,
1110         .next = lec_seq_next,
1111         .stop = lec_seq_stop,
1112         .show = lec_seq_show,
1113 };
1114
1115 static int lec_seq_open(struct inode *inode, struct file *file)
1116 {
1117         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1118 }
1119
1120 static const struct file_operations lec_seq_fops = {
1121         .owner = THIS_MODULE,
1122         .open = lec_seq_open,
1123         .read = seq_read,
1124         .llseek = seq_lseek,
1125         .release = seq_release_private,
1126 };
1127 #endif
1128
1129 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1130 {
1131         struct atm_vcc *vcc = ATM_SD(sock);
1132         int err = 0;
1133
1134         switch (cmd) {
1135         case ATMLEC_CTRL:
1136         case ATMLEC_MCAST:
1137         case ATMLEC_DATA:
1138                 if (!capable(CAP_NET_ADMIN))
1139                         return -EPERM;
1140                 break;
1141         default:
1142                 return -ENOIOCTLCMD;
1143         }
1144
1145         switch (cmd) {
1146         case ATMLEC_CTRL:
1147                 err = lecd_attach(vcc, (int)arg);
1148                 if (err >= 0)
1149                         sock->state = SS_CONNECTED;
1150                 break;
1151         case ATMLEC_MCAST:
1152                 err = lec_mcast_attach(vcc, (int)arg);
1153                 break;
1154         case ATMLEC_DATA:
1155                 err = lec_vcc_attach(vcc, (void __user *)arg);
1156                 break;
1157         }
1158
1159         return err;
1160 }
1161
1162 static struct atm_ioctl lane_ioctl_ops = {
1163         .owner = THIS_MODULE,
1164         .ioctl = lane_ioctl,
1165 };
1166
1167 static int __init lane_module_init(void)
1168 {
1169 #ifdef CONFIG_PROC_FS
1170         struct proc_dir_entry *p;
1171
1172         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1173         if (!p) {
1174                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1175                 return -ENOMEM;
1176         }
1177 #endif
1178
1179         register_atm_ioctl(&lane_ioctl_ops);
1180         pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1181         return 0;
1182 }
1183
1184 static void __exit lane_module_cleanup(void)
1185 {
1186         int i;
1187         struct lec_priv *priv;
1188
1189         remove_proc_entry("lec", atm_proc_root);
1190
1191         deregister_atm_ioctl(&lane_ioctl_ops);
1192
1193         for (i = 0; i < MAX_LEC_ITF; i++) {
1194                 if (dev_lec[i] != NULL) {
1195                         priv = netdev_priv(dev_lec[i]);
1196                         unregister_netdev(dev_lec[i]);
1197                         free_netdev(dev_lec[i]);
1198                         dev_lec[i] = NULL;
1199                 }
1200         }
1201
1202         return;
1203 }
1204
1205 module_init(lane_module_init);
1206 module_exit(lane_module_cleanup);
1207
1208 /*
1209  * LANE2: 3.1.3, LE_RESOLVE.request
1210  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1211  * If sizeoftlvs == NULL the default TLVs associated with with this
1212  * lec will be used.
1213  * If dst_mac == NULL, targetless LE_ARP will be sent
1214  */
1215 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1216                          u8 **tlvs, u32 *sizeoftlvs)
1217 {
1218         unsigned long flags;
1219         struct lec_priv *priv = netdev_priv(dev);
1220         struct lec_arp_table *table;
1221         struct sk_buff *skb;
1222         int retval;
1223
1224         if (force == 0) {
1225                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1226                 table = lec_arp_find(priv, dst_mac);
1227                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1228                 if (table == NULL)
1229                         return -1;
1230
1231                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1232                 if (*tlvs == NULL)
1233                         return -1;
1234
1235                 *sizeoftlvs = table->sizeoftlvs;
1236
1237                 return 0;
1238         }
1239
1240         if (sizeoftlvs == NULL)
1241                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1242
1243         else {
1244                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1245                 if (skb == NULL)
1246                         return -1;
1247                 skb->len = *sizeoftlvs;
1248                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1249                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1250         }
1251         return retval;
1252 }
1253
1254 /*
1255  * LANE2: 3.1.4, LE_ASSOCIATE.request
1256  * Associate the *tlvs with the *lan_dst address.
1257  * Will overwrite any previous association
1258  * Returns 1 for success, 0 for failure (out of memory)
1259  *
1260  */
1261 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1262                                const u8 *tlvs, u32 sizeoftlvs)
1263 {
1264         int retval;
1265         struct sk_buff *skb;
1266         struct lec_priv *priv = netdev_priv(dev);
1267
1268         if (compare_ether_addr(lan_dst, dev->dev_addr))
1269                 return 0;       /* not our mac address */
1270
1271         kfree(priv->tlvs);      /* NULL if there was no previous association */
1272
1273         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1274         if (priv->tlvs == NULL)
1275                 return 0;
1276         priv->sizeoftlvs = sizeoftlvs;
1277
1278         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1279         if (skb == NULL)
1280                 return 0;
1281         skb->len = sizeoftlvs;
1282         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1283         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1284         if (retval != 0)
1285                 pr_info("lec.c: lane2_associate_req() failed\n");
1286         /*
1287          * If the previous association has changed we must
1288          * somehow notify other LANE entities about the change
1289          */
1290         return 1;
1291 }
1292
1293 /*
1294  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1295  *
1296  */
1297 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1298                                 const u8 *tlvs, u32 sizeoftlvs)
1299 {
1300 #if 0
1301         int i = 0;
1302 #endif
1303         struct lec_priv *priv = netdev_priv(dev);
1304 #if 0                           /*
1305                                  * Why have the TLVs in LE_ARP entries
1306                                  * since we do not use them? When you
1307                                  * uncomment this code, make sure the
1308                                  * TLVs get freed when entry is killed
1309                                  */
1310         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1311
1312         if (entry == NULL)
1313                 return;         /* should not happen */
1314
1315         kfree(entry->tlvs);
1316
1317         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1318         if (entry->tlvs == NULL)
1319                 return;
1320         entry->sizeoftlvs = sizeoftlvs;
1321 #endif
1322 #if 0
1323         pr_info("\n");
1324         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1325         while (i < sizeoftlvs)
1326                 pr_cont("%02x ", tlvs[i++]);
1327
1328         pr_cont("\n");
1329 #endif
1330
1331         /* tell MPOA about the TLVs we saw */
1332         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1333                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1334                                                      tlvs, sizeoftlvs);
1335         }
1336         return;
1337 }
1338
1339 /*
1340  * Here starts what used to lec_arpc.c
1341  *
1342  * lec_arpc.c was added here when making
1343  * lane client modular. October 1997
1344  */
1345
1346 #include <linux/types.h>
1347 #include <linux/timer.h>
1348 #include <linux/param.h>
1349 #include <asm/atomic.h>
1350 #include <linux/inetdevice.h>
1351 #include <net/route.h>
1352
1353 #if 0
1354 #define pr_debug(format, args...)
1355 /*
1356   #define pr_debug printk
1357 */
1358 #endif
1359 #define DEBUG_ARP_TABLE 0
1360
1361 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1362
1363 static void lec_arp_check_expire(struct work_struct *work);
1364 static void lec_arp_expire_arp(unsigned long data);
1365
1366 /*
1367  * Arp table funcs
1368  */
1369
1370 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1371
1372 /*
1373  * Initialization of arp-cache
1374  */
1375 static void lec_arp_init(struct lec_priv *priv)
1376 {
1377         unsigned short i;
1378
1379         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1380                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1381         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1382         INIT_HLIST_HEAD(&priv->lec_no_forward);
1383         INIT_HLIST_HEAD(&priv->mcast_fwds);
1384         spin_lock_init(&priv->lec_arp_lock);
1385         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1386         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1387 }
1388
1389 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1390 {
1391         if (entry->vcc) {
1392                 struct atm_vcc *vcc = entry->vcc;
1393                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1394                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1395
1396                 vcc->pop = vpriv->old_pop;
1397                 if (vpriv->xoff)
1398                         netif_wake_queue(dev);
1399                 kfree(vpriv);
1400                 vcc->user_back = NULL;
1401                 vcc->push = entry->old_push;
1402                 vcc_release_async(vcc, -EPIPE);
1403                 entry->vcc = NULL;
1404         }
1405         if (entry->recv_vcc) {
1406                 entry->recv_vcc->push = entry->old_recv_push;
1407                 vcc_release_async(entry->recv_vcc, -EPIPE);
1408                 entry->recv_vcc = NULL;
1409         }
1410 }
1411
1412 /*
1413  * Insert entry to lec_arp_table
1414  * LANE2: Add to the end of the list to satisfy 8.1.13
1415  */
1416 static inline void
1417 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1418 {
1419         struct hlist_head *tmp;
1420
1421         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1422         hlist_add_head(&entry->next, tmp);
1423
1424         pr_debug("Added entry:%pM\n", entry->mac_addr);
1425 }
1426
1427 /*
1428  * Remove entry from lec_arp_table
1429  */
1430 static int
1431 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1432 {
1433         struct hlist_node *node;
1434         struct lec_arp_table *entry;
1435         int i, remove_vcc = 1;
1436
1437         if (!to_remove)
1438                 return -1;
1439
1440         hlist_del(&to_remove->next);
1441         del_timer(&to_remove->timer);
1442
1443         /*
1444          * If this is the only MAC connected to this VCC,
1445          * also tear down the VCC
1446          */
1447         if (to_remove->status >= ESI_FLUSH_PENDING) {
1448                 /*
1449                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1450                  */
1451                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1452                         hlist_for_each_entry(entry, node,
1453                                              &priv->lec_arp_tables[i], next) {
1454                                 if (memcmp(to_remove->atm_addr,
1455                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1456                                         remove_vcc = 0;
1457                                         break;
1458                                 }
1459                         }
1460                 }
1461                 if (remove_vcc)
1462                         lec_arp_clear_vccs(to_remove);
1463         }
1464         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1465
1466         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1467         return 0;
1468 }
1469
1470 #if DEBUG_ARP_TABLE
1471 static const char *get_status_string(unsigned char st)
1472 {
1473         switch (st) {
1474         case ESI_UNKNOWN:
1475                 return "ESI_UNKNOWN";
1476         case ESI_ARP_PENDING:
1477                 return "ESI_ARP_PENDING";
1478         case ESI_VC_PENDING:
1479                 return "ESI_VC_PENDING";
1480         case ESI_FLUSH_PENDING:
1481                 return "ESI_FLUSH_PENDING";
1482         case ESI_FORWARD_DIRECT:
1483                 return "ESI_FORWARD_DIRECT";
1484         }
1485         return "<UNKNOWN>";
1486 }
1487
1488 static void dump_arp_table(struct lec_priv *priv)
1489 {
1490         struct hlist_node *node;
1491         struct lec_arp_table *rulla;
1492         char buf[256];
1493         int i, j, offset;
1494
1495         pr_info("Dump %p:\n", priv);
1496         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1497                 hlist_for_each_entry(rulla, node,
1498                                      &priv->lec_arp_tables[i], next) {
1499                         offset = 0;
1500                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1501                         offset += sprintf(buf + offset, "Mac: %pM",
1502                                           rulla->mac_addr);
1503                         offset += sprintf(buf + offset, " Atm:");
1504                         for (j = 0; j < ATM_ESA_LEN; j++) {
1505                                 offset += sprintf(buf + offset,
1506                                                   "%2.2x ",
1507                                                   rulla->atm_addr[j] & 0xff);
1508                         }
1509                         offset += sprintf(buf + offset,
1510                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1511                                           rulla->vcc ? rulla->vcc->vpi : 0,
1512                                           rulla->vcc ? rulla->vcc->vci : 0,
1513                                           rulla->recv_vcc ? rulla->recv_vcc->
1514                                           vpi : 0,
1515                                           rulla->recv_vcc ? rulla->recv_vcc->
1516                                           vci : 0, rulla->last_used,
1517                                           rulla->timestamp, rulla->no_tries);
1518                         offset +=
1519                             sprintf(buf + offset,
1520                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1521                                     rulla->flags, rulla->packets_flooded,
1522                                     get_status_string(rulla->status));
1523                         pr_info("%s\n", buf);
1524                 }
1525         }
1526
1527         if (!hlist_empty(&priv->lec_no_forward))
1528                 pr_info("No forward\n");
1529         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1530                 offset = 0;
1531                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1532                 offset += sprintf(buf + offset, " Atm:");
1533                 for (j = 0; j < ATM_ESA_LEN; j++) {
1534                         offset += sprintf(buf + offset, "%2.2x ",
1535                                           rulla->atm_addr[j] & 0xff);
1536                 }
1537                 offset += sprintf(buf + offset,
1538                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1539                                   rulla->vcc ? rulla->vcc->vpi : 0,
1540                                   rulla->vcc ? rulla->vcc->vci : 0,
1541                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1542                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1543                                   rulla->last_used,
1544                                   rulla->timestamp, rulla->no_tries);
1545                 offset += sprintf(buf + offset,
1546                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1547                                   rulla->flags, rulla->packets_flooded,
1548                                   get_status_string(rulla->status));
1549                 pr_info("%s\n", buf);
1550         }
1551
1552         if (!hlist_empty(&priv->lec_arp_empty_ones))
1553                 pr_info("Empty ones\n");
1554         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1555                 offset = 0;
1556                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1557                 offset += sprintf(buf + offset, " Atm:");
1558                 for (j = 0; j < ATM_ESA_LEN; j++) {
1559                         offset += sprintf(buf + offset, "%2.2x ",
1560                                           rulla->atm_addr[j] & 0xff);
1561                 }
1562                 offset += sprintf(buf + offset,
1563                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1564                                   rulla->vcc ? rulla->vcc->vpi : 0,
1565                                   rulla->vcc ? rulla->vcc->vci : 0,
1566                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1567                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1568                                   rulla->last_used,
1569                                   rulla->timestamp, rulla->no_tries);
1570                 offset += sprintf(buf + offset,
1571                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1572                                   rulla->flags, rulla->packets_flooded,
1573                                   get_status_string(rulla->status));
1574                 pr_info("%s", buf);
1575         }
1576
1577         if (!hlist_empty(&priv->mcast_fwds))
1578                 pr_info("Multicast Forward VCCs\n");
1579         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1580                 offset = 0;
1581                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1582                 offset += sprintf(buf + offset, " Atm:");
1583                 for (j = 0; j < ATM_ESA_LEN; j++) {
1584                         offset += sprintf(buf + offset, "%2.2x ",
1585                                           rulla->atm_addr[j] & 0xff);
1586                 }
1587                 offset += sprintf(buf + offset,
1588                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1589                                   rulla->vcc ? rulla->vcc->vpi : 0,
1590                                   rulla->vcc ? rulla->vcc->vci : 0,
1591                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1592                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1593                                   rulla->last_used,
1594                                   rulla->timestamp, rulla->no_tries);
1595                 offset += sprintf(buf + offset,
1596                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1597                                   rulla->flags, rulla->packets_flooded,
1598                                   get_status_string(rulla->status));
1599                 pr_info("%s\n", buf);
1600         }
1601
1602 }
1603 #else
1604 #define dump_arp_table(priv) do { } while (0)
1605 #endif
1606
1607 /*
1608  * Destruction of arp-cache
1609  */
1610 static void lec_arp_destroy(struct lec_priv *priv)
1611 {
1612         unsigned long flags;
1613         struct hlist_node *node, *next;
1614         struct lec_arp_table *entry;
1615         int i;
1616
1617         cancel_rearming_delayed_work(&priv->lec_arp_work);
1618
1619         /*
1620          * Remove all entries
1621          */
1622
1623         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1624         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1625                 hlist_for_each_entry_safe(entry, node, next,
1626                                           &priv->lec_arp_tables[i], next) {
1627                         lec_arp_remove(priv, entry);
1628                         lec_arp_put(entry);
1629                 }
1630                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1631         }
1632
1633         hlist_for_each_entry_safe(entry, node, next,
1634                                   &priv->lec_arp_empty_ones, next) {
1635                 del_timer_sync(&entry->timer);
1636                 lec_arp_clear_vccs(entry);
1637                 hlist_del(&entry->next);
1638                 lec_arp_put(entry);
1639         }
1640         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1641
1642         hlist_for_each_entry_safe(entry, node, next,
1643                                   &priv->lec_no_forward, next) {
1644                 del_timer_sync(&entry->timer);
1645                 lec_arp_clear_vccs(entry);
1646                 hlist_del(&entry->next);
1647                 lec_arp_put(entry);
1648         }
1649         INIT_HLIST_HEAD(&priv->lec_no_forward);
1650
1651         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1652                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1653                 lec_arp_clear_vccs(entry);
1654                 hlist_del(&entry->next);
1655                 lec_arp_put(entry);
1656         }
1657         INIT_HLIST_HEAD(&priv->mcast_fwds);
1658         priv->mcast_vcc = NULL;
1659         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1660 }
1661
1662 /*
1663  * Find entry by mac_address
1664  */
1665 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1666                                           const unsigned char *mac_addr)
1667 {
1668         struct hlist_node *node;
1669         struct hlist_head *head;
1670         struct lec_arp_table *entry;
1671
1672         pr_debug("%pM\n", mac_addr);
1673
1674         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1675         hlist_for_each_entry(entry, node, head, next) {
1676                 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1677                         return entry;
1678         }
1679         return NULL;
1680 }
1681
1682 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1683                                         const unsigned char *mac_addr)
1684 {
1685         struct lec_arp_table *to_return;
1686
1687         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1688         if (!to_return) {
1689                 pr_info("LEC: Arp entry kmalloc failed\n");
1690                 return NULL;
1691         }
1692         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1693         INIT_HLIST_NODE(&to_return->next);
1694         setup_timer(&to_return->timer, lec_arp_expire_arp,
1695                         (unsigned long)to_return);
1696         to_return->last_used = jiffies;
1697         to_return->priv = priv;
1698         skb_queue_head_init(&to_return->tx_wait);
1699         atomic_set(&to_return->usage, 1);
1700         return to_return;
1701 }
1702
1703 /* Arp sent timer expired */
1704 static void lec_arp_expire_arp(unsigned long data)
1705 {
1706         struct lec_arp_table *entry;
1707
1708         entry = (struct lec_arp_table *)data;
1709
1710         pr_debug("\n");
1711         if (entry->status == ESI_ARP_PENDING) {
1712                 if (entry->no_tries <= entry->priv->max_retry_count) {
1713                         if (entry->is_rdesc)
1714                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1715                                              entry->mac_addr, NULL, NULL);
1716                         else
1717                                 send_to_lecd(entry->priv, l_arp_xmt,
1718                                              entry->mac_addr, NULL, NULL);
1719                         entry->no_tries++;
1720                 }
1721                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1722         }
1723 }
1724
1725 /* Unknown/unused vcc expire, remove associated entry */
1726 static void lec_arp_expire_vcc(unsigned long data)
1727 {
1728         unsigned long flags;
1729         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1730         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1731
1732         del_timer(&to_remove->timer);
1733
1734         pr_debug("%p %p: vpi:%d vci:%d\n",
1735                  to_remove, priv,
1736                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1737                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1738
1739         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1740         hlist_del(&to_remove->next);
1741         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1742
1743         lec_arp_clear_vccs(to_remove);
1744         lec_arp_put(to_remove);
1745 }
1746
1747 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1748                                    unsigned long now,
1749                                    struct lec_priv *priv)
1750 {
1751         unsigned long time_to_check;
1752
1753         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1754                 time_to_check = priv->forward_delay_time;
1755         else
1756                 time_to_check = priv->aging_time;
1757
1758         pr_debug("About to expire: %lx - %lx > %lx\n",
1759                  now, entry->last_used, time_to_check);
1760         if (time_after(now, entry->last_used + time_to_check) &&
1761             !(entry->flags & LEC_PERMANENT_FLAG) &&
1762             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1763                 /* Remove entry */
1764                 pr_debug("Entry timed out\n");
1765                 lec_arp_remove(priv, entry);
1766                 lec_arp_put(entry);
1767         } else {
1768                 /* Something else */
1769                 if ((entry->status == ESI_VC_PENDING ||
1770                      entry->status == ESI_ARP_PENDING) &&
1771                     time_after_eq(now, entry->timestamp +
1772                                        priv->max_unknown_frame_time)) {
1773                         entry->timestamp = jiffies;
1774                         entry->packets_flooded = 0;
1775                         if (entry->status == ESI_VC_PENDING)
1776                                 send_to_lecd(priv, l_svc_setup,
1777                                              entry->mac_addr,
1778                                              entry->atm_addr,
1779                                              NULL);
1780                 }
1781                 if (entry->status == ESI_FLUSH_PENDING &&
1782                     time_after_eq(now, entry->timestamp +
1783                                        priv->path_switching_delay)) {
1784                         lec_arp_hold(entry);
1785                         return true;
1786                 }
1787         }
1788
1789         return false;
1790 }
1791 /*
1792  * Expire entries.
1793  * 1. Re-set timer
1794  * 2. For each entry, delete entries that have aged past the age limit.
1795  * 3. For each entry, depending on the status of the entry, perform
1796  *    the following maintenance.
1797  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1798  *       tick_count is above the max_unknown_frame_time, clear
1799  *       the tick_count to zero and clear the packets_flooded counter
1800  *       to zero. This supports the packet rate limit per address
1801  *       while flooding unknowns.
1802  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1803  *       than or equal to the path_switching_delay, change the status
1804  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1805  *       regardless of the progress of the flush protocol.
1806  */
1807 static void lec_arp_check_expire(struct work_struct *work)
1808 {
1809         unsigned long flags;
1810         struct lec_priv *priv =
1811                 container_of(work, struct lec_priv, lec_arp_work.work);
1812         struct hlist_node *node, *next;
1813         struct lec_arp_table *entry;
1814         unsigned long now;
1815         int i;
1816
1817         pr_debug("%p\n", priv);
1818         now = jiffies;
1819 restart:
1820         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1821         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1822                 hlist_for_each_entry_safe(entry, node, next,
1823                                           &priv->lec_arp_tables[i], next) {
1824                         if (__lec_arp_check_expire(entry, now, priv)) {
1825                                 struct sk_buff *skb;
1826                                 struct atm_vcc *vcc = entry->vcc;
1827
1828                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1829                                                        flags);
1830                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1831                                         lec_send(vcc, skb);
1832                                 entry->last_used = jiffies;
1833                                 entry->status = ESI_FORWARD_DIRECT;
1834                                 lec_arp_put(entry);
1835
1836                                 goto restart;
1837                         }
1838                 }
1839         }
1840         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1841
1842         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1843 }
1844
1845 /*
1846  * Try to find vcc where mac_address is attached.
1847  *
1848  */
1849 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1850                                        const unsigned char *mac_to_find,
1851                                        int is_rdesc,
1852                                        struct lec_arp_table **ret_entry)
1853 {
1854         unsigned long flags;
1855         struct lec_arp_table *entry;
1856         struct atm_vcc *found;
1857
1858         if (mac_to_find[0] & 0x01) {
1859                 switch (priv->lane_version) {
1860                 case 1:
1861                         return priv->mcast_vcc;
1862                 case 2: /* LANE2 wants arp for multicast addresses */
1863                         if (!compare_ether_addr(mac_to_find, bus_mac))
1864                                 return priv->mcast_vcc;
1865                         break;
1866                 default:
1867                         break;
1868                 }
1869         }
1870
1871         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1872         entry = lec_arp_find(priv, mac_to_find);
1873
1874         if (entry) {
1875                 if (entry->status == ESI_FORWARD_DIRECT) {
1876                         /* Connection Ok */
1877                         entry->last_used = jiffies;
1878                         lec_arp_hold(entry);
1879                         *ret_entry = entry;
1880                         found = entry->vcc;
1881                         goto out;
1882                 }
1883                 /*
1884                  * If the LE_ARP cache entry is still pending, reset count to 0
1885                  * so another LE_ARP request can be made for this frame.
1886                  */
1887                 if (entry->status == ESI_ARP_PENDING)
1888                         entry->no_tries = 0;
1889                 /*
1890                  * Data direct VC not yet set up, check to see if the unknown
1891                  * frame count is greater than the limit. If the limit has
1892                  * not been reached, allow the caller to send packet to
1893                  * BUS.
1894                  */
1895                 if (entry->status != ESI_FLUSH_PENDING &&
1896                     entry->packets_flooded <
1897                     priv->maximum_unknown_frame_count) {
1898                         entry->packets_flooded++;
1899                         pr_debug("Flooding..\n");
1900                         found = priv->mcast_vcc;
1901                         goto out;
1902                 }
1903                 /*
1904                  * We got here because entry->status == ESI_FLUSH_PENDING
1905                  * or BUS flood limit was reached for an entry which is
1906                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1907                  */
1908                 lec_arp_hold(entry);
1909                 *ret_entry = entry;
1910                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1911                          entry->vcc);
1912                 found = NULL;
1913         } else {
1914                 /* No matching entry was found */
1915                 entry = make_entry(priv, mac_to_find);
1916                 pr_debug("Making entry\n");
1917                 if (!entry) {
1918                         found = priv->mcast_vcc;
1919                         goto out;
1920                 }
1921                 lec_arp_add(priv, entry);
1922                 /* We want arp-request(s) to be sent */
1923                 entry->packets_flooded = 1;
1924                 entry->status = ESI_ARP_PENDING;
1925                 entry->no_tries = 1;
1926                 entry->last_used = entry->timestamp = jiffies;
1927                 entry->is_rdesc = is_rdesc;
1928                 if (entry->is_rdesc)
1929                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1930                                      NULL);
1931                 else
1932                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1933                 entry->timer.expires = jiffies + (1 * HZ);
1934                 entry->timer.function = lec_arp_expire_arp;
1935                 add_timer(&entry->timer);
1936                 found = priv->mcast_vcc;
1937         }
1938
1939 out:
1940         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1941         return found;
1942 }
1943
1944 static int
1945 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1946                 unsigned long permanent)
1947 {
1948         unsigned long flags;
1949         struct hlist_node *node, *next;
1950         struct lec_arp_table *entry;
1951         int i;
1952
1953         pr_debug("\n");
1954         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1955         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1956                 hlist_for_each_entry_safe(entry, node, next,
1957                                           &priv->lec_arp_tables[i], next) {
1958                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1959                             (permanent ||
1960                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1961                                 lec_arp_remove(priv, entry);
1962                                 lec_arp_put(entry);
1963                         }
1964                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1965                         return 0;
1966                 }
1967         }
1968         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1969         return -1;
1970 }
1971
1972 /*
1973  * Notifies:  Response to arp_request (atm_addr != NULL)
1974  */
1975 static void
1976 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1977                const unsigned char *atm_addr, unsigned long remoteflag,
1978                unsigned int targetless_le_arp)
1979 {
1980         unsigned long flags;
1981         struct hlist_node *node, *next;
1982         struct lec_arp_table *entry, *tmp;
1983         int i;
1984
1985         pr_debug("%smac:%pM\n",
1986                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1987
1988         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1989         entry = lec_arp_find(priv, mac_addr);
1990         if (entry == NULL && targetless_le_arp)
1991                 goto out;       /*
1992                                  * LANE2: ignore targetless LE_ARPs for which
1993                                  * we have no entry in the cache. 7.1.30
1994                                  */
1995         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1996                 hlist_for_each_entry_safe(entry, node, next,
1997                                           &priv->lec_arp_empty_ones, next) {
1998                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1999                                 hlist_del(&entry->next);
2000                                 del_timer(&entry->timer);
2001                                 tmp = lec_arp_find(priv, mac_addr);
2002                                 if (tmp) {
2003                                         del_timer(&tmp->timer);
2004                                         tmp->status = ESI_FORWARD_DIRECT;
2005                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2006                                         tmp->vcc = entry->vcc;
2007                                         tmp->old_push = entry->old_push;
2008                                         tmp->last_used = jiffies;
2009                                         del_timer(&entry->timer);
2010                                         lec_arp_put(entry);
2011                                         entry = tmp;
2012                                 } else {
2013                                         entry->status = ESI_FORWARD_DIRECT;
2014                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2015                                         entry->last_used = jiffies;
2016                                         lec_arp_add(priv, entry);
2017                                 }
2018                                 if (remoteflag)
2019                                         entry->flags |= LEC_REMOTE_FLAG;
2020                                 else
2021                                         entry->flags &= ~LEC_REMOTE_FLAG;
2022                                 pr_debug("After update\n");
2023                                 dump_arp_table(priv);
2024                                 goto out;
2025                         }
2026                 }
2027         }
2028
2029         entry = lec_arp_find(priv, mac_addr);
2030         if (!entry) {
2031                 entry = make_entry(priv, mac_addr);
2032                 if (!entry)
2033                         goto out;
2034                 entry->status = ESI_UNKNOWN;
2035                 lec_arp_add(priv, entry);
2036                 /* Temporary, changes before end of function */
2037         }
2038         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2039         del_timer(&entry->timer);
2040         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2041                 hlist_for_each_entry(tmp, node,
2042                                      &priv->lec_arp_tables[i], next) {
2043                         if (entry != tmp &&
2044                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2045                                 /* Vcc to this host exists */
2046                                 if (tmp->status > ESI_VC_PENDING) {
2047                                         /*
2048                                          * ESI_FLUSH_PENDING,
2049                                          * ESI_FORWARD_DIRECT
2050                                          */
2051                                         entry->vcc = tmp->vcc;
2052                                         entry->old_push = tmp->old_push;
2053                                 }
2054                                 entry->status = tmp->status;
2055                                 break;
2056                         }
2057                 }
2058         }
2059         if (remoteflag)
2060                 entry->flags |= LEC_REMOTE_FLAG;
2061         else
2062                 entry->flags &= ~LEC_REMOTE_FLAG;
2063         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2064                 entry->status = ESI_VC_PENDING;
2065                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2066         }
2067         pr_debug("After update2\n");
2068         dump_arp_table(priv);
2069 out:
2070         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2071 }
2072
2073 /*
2074  * Notifies: Vcc setup ready
2075  */
2076 static void
2077 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2078               struct atm_vcc *vcc,
2079               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2080 {
2081         unsigned long flags;
2082         struct hlist_node *node;
2083         struct lec_arp_table *entry;
2084         int i, found_entry = 0;
2085
2086         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2087         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2088         if (ioc_data->receive == 2) {
2089                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2090 #if 0
2091                 entry = lec_arp_find(priv, bus_mac);
2092                 if (!entry) {
2093                         pr_info("LEC_ARP: Multicast entry not found!\n");
2094                         goto out;
2095                 }
2096                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2097                 entry->recv_vcc = vcc;
2098                 entry->old_recv_push = old_push;
2099 #endif
2100                 entry = make_entry(priv, bus_mac);
2101                 if (entry == NULL)
2102                         goto out;
2103                 del_timer(&entry->timer);
2104                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2105                 entry->recv_vcc = vcc;
2106                 entry->old_recv_push = old_push;
2107                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2108                 goto out;
2109         } else if (ioc_data->receive == 1) {
2110                 /*
2111                  * Vcc which we don't want to make default vcc,
2112                  * attach it anyway.
2113                  */
2114                 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2115                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2116                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2117                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2118                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2119                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2120                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2121                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2122                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2123                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2124                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2125                 entry = make_entry(priv, bus_mac);
2126                 if (entry == NULL)
2127                         goto out;
2128                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2129                 memset(entry->mac_addr, 0, ETH_ALEN);
2130                 entry->recv_vcc = vcc;
2131                 entry->old_recv_push = old_push;
2132                 entry->status = ESI_UNKNOWN;
2133                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2134                 entry->timer.function = lec_arp_expire_vcc;
2135                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2136                 add_timer(&entry->timer);
2137                 dump_arp_table(priv);
2138                 goto out;
2139         }
2140         pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2141                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2142                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2143                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2144                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2145                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2146                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2147                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2148                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2149                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2150                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2151         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2152                 hlist_for_each_entry(entry, node,
2153                                      &priv->lec_arp_tables[i], next) {
2154                         if (memcmp
2155                             (ioc_data->atm_addr, entry->atm_addr,
2156                              ATM_ESA_LEN) == 0) {
2157                                 pr_debug("LEC_ARP: Attaching data direct\n");
2158                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2159                                          entry->vcc ? entry->vcc->vci : 0,
2160                                          entry->recv_vcc ? entry->recv_vcc->
2161                                          vci : 0);
2162                                 found_entry = 1;
2163                                 del_timer(&entry->timer);
2164                                 entry->vcc = vcc;
2165                                 entry->old_push = old_push;
2166                                 if (entry->status == ESI_VC_PENDING) {
2167                                         if (priv->maximum_unknown_frame_count
2168                                             == 0)
2169                                                 entry->status =
2170                                                     ESI_FORWARD_DIRECT;
2171                                         else {
2172                                                 entry->timestamp = jiffies;
2173                                                 entry->status =
2174                                                     ESI_FLUSH_PENDING;
2175 #if 0
2176                                                 send_to_lecd(priv, l_flush_xmt,
2177                                                              NULL,
2178                                                              entry->atm_addr,
2179                                                              NULL);
2180 #endif
2181                                         }
2182                                 } else {
2183                                         /*
2184                                          * They were forming a connection
2185                                          * to us, and we to them. Our
2186                                          * ATM address is numerically lower
2187                                          * than theirs, so we make connection
2188                                          * we formed into default VCC (8.1.11).
2189                                          * Connection they made gets torn
2190                                          * down. This might confuse some
2191                                          * clients. Can be changed if
2192                                          * someone reports trouble...
2193                                          */
2194                                         ;
2195                                 }
2196                         }
2197                 }
2198         }
2199         if (found_entry) {
2200                 pr_debug("After vcc was added\n");
2201                 dump_arp_table(priv);
2202                 goto out;
2203         }
2204         /*
2205          * Not found, snatch address from first data packet that arrives
2206          * from this vcc
2207          */
2208         entry = make_entry(priv, bus_mac);
2209         if (!entry)
2210                 goto out;
2211         entry->vcc = vcc;
2212         entry->old_push = old_push;
2213         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2214         memset(entry->mac_addr, 0, ETH_ALEN);
2215         entry->status = ESI_UNKNOWN;
2216         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2217         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2218         entry->timer.function = lec_arp_expire_vcc;
2219         add_timer(&entry->timer);
2220         pr_debug("After vcc was added\n");
2221         dump_arp_table(priv);
2222 out:
2223         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2224 }
2225
2226 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2227 {
2228         unsigned long flags;
2229         struct hlist_node *node;
2230         struct lec_arp_table *entry;
2231         int i;
2232
2233         pr_debug("%lx\n", tran_id);
2234 restart:
2235         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2236         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2237                 hlist_for_each_entry(entry, node,
2238                                      &priv->lec_arp_tables[i], next) {
2239                         if (entry->flush_tran_id == tran_id &&
2240                             entry->status == ESI_FLUSH_PENDING) {
2241                                 struct sk_buff *skb;
2242                                 struct atm_vcc *vcc = entry->vcc;
2243
2244                                 lec_arp_hold(entry);
2245                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2246                                                        flags);
2247                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2248                                         lec_send(vcc, skb);
2249                                 entry->last_used = jiffies;
2250                                 entry->status = ESI_FORWARD_DIRECT;
2251                                 lec_arp_put(entry);
2252                                 pr_debug("LEC_ARP: Flushed\n");
2253                                 goto restart;
2254                         }
2255                 }
2256         }
2257         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2258         dump_arp_table(priv);
2259 }
2260
2261 static void
2262 lec_set_flush_tran_id(struct lec_priv *priv,
2263                       const unsigned char *atm_addr, unsigned long tran_id)
2264 {
2265         unsigned long flags;
2266         struct hlist_node *node;
2267         struct lec_arp_table *entry;
2268         int i;
2269
2270         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2271         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2272                 hlist_for_each_entry(entry, node,
2273                                      &priv->lec_arp_tables[i], next) {
2274                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2275                                 entry->flush_tran_id = tran_id;
2276                                 pr_debug("Set flush transaction id to %lx for %p\n",
2277                                          tran_id, entry);
2278                         }
2279                 }
2280         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2281 }
2282
2283 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2284 {
2285         unsigned long flags;
2286         unsigned char mac_addr[] = {
2287                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2288         };
2289         struct lec_arp_table *to_add;
2290         struct lec_vcc_priv *vpriv;
2291         int err = 0;
2292
2293         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2294         if (!vpriv)
2295                 return -ENOMEM;
2296         vpriv->xoff = 0;
2297         vpriv->old_pop = vcc->pop;
2298         vcc->user_back = vpriv;
2299         vcc->pop = lec_pop;
2300         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2301         to_add = make_entry(priv, mac_addr);
2302         if (!to_add) {
2303                 vcc->pop = vpriv->old_pop;
2304                 kfree(vpriv);
2305                 err = -ENOMEM;
2306                 goto out;
2307         }
2308         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2309         to_add->status = ESI_FORWARD_DIRECT;
2310         to_add->flags |= LEC_PERMANENT_FLAG;
2311         to_add->vcc = vcc;
2312         to_add->old_push = vcc->push;
2313         vcc->push = lec_push;
2314         priv->mcast_vcc = vcc;
2315         lec_arp_add(priv, to_add);
2316 out:
2317         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2318         return err;
2319 }
2320
2321 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2322 {
2323         unsigned long flags;
2324         struct hlist_node *node, *next;
2325         struct lec_arp_table *entry;
2326         int i;
2327
2328         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2329         dump_arp_table(priv);
2330
2331         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2332
2333         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2334                 hlist_for_each_entry_safe(entry, node, next,
2335                                           &priv->lec_arp_tables[i], next) {
2336                         if (vcc == entry->vcc) {
2337                                 lec_arp_remove(priv, entry);
2338                                 lec_arp_put(entry);
2339                                 if (priv->mcast_vcc == vcc)
2340                                         priv->mcast_vcc = NULL;
2341                         }
2342                 }
2343         }
2344
2345         hlist_for_each_entry_safe(entry, node, next,
2346                                   &priv->lec_arp_empty_ones, next) {
2347                 if (entry->vcc == vcc) {
2348                         lec_arp_clear_vccs(entry);
2349                         del_timer(&entry->timer);
2350                         hlist_del(&entry->next);
2351                         lec_arp_put(entry);
2352                 }
2353         }
2354
2355         hlist_for_each_entry_safe(entry, node, next,
2356                                   &priv->lec_no_forward, next) {
2357                 if (entry->recv_vcc == vcc) {
2358                         lec_arp_clear_vccs(entry);
2359                         del_timer(&entry->timer);
2360                         hlist_del(&entry->next);
2361                         lec_arp_put(entry);
2362                 }
2363         }
2364
2365         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2366                 if (entry->recv_vcc == vcc) {
2367                         lec_arp_clear_vccs(entry);
2368                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2369                         hlist_del(&entry->next);
2370                         lec_arp_put(entry);
2371                 }
2372         }
2373
2374         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2375         dump_arp_table(priv);
2376 }
2377
2378 static void
2379 lec_arp_check_empties(struct lec_priv *priv,
2380                       struct atm_vcc *vcc, struct sk_buff *skb)
2381 {
2382         unsigned long flags;
2383         struct hlist_node *node, *next;
2384         struct lec_arp_table *entry, *tmp;
2385         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2386         unsigned char *src;
2387 #ifdef CONFIG_TR
2388         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2389
2390         if (priv->is_trdev)
2391                 src = tr_hdr->h_source;
2392         else
2393 #endif
2394                 src = hdr->h_source;
2395
2396         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2397         hlist_for_each_entry_safe(entry, node, next,
2398                                   &priv->lec_arp_empty_ones, next) {
2399                 if (vcc == entry->vcc) {
2400                         del_timer(&entry->timer);
2401                         memcpy(entry->mac_addr, src, ETH_ALEN);
2402                         entry->status = ESI_FORWARD_DIRECT;
2403                         entry->last_used = jiffies;
2404                         /* We might have got an entry */
2405                         tmp = lec_arp_find(priv, src);
2406                         if (tmp) {
2407                                 lec_arp_remove(priv, tmp);
2408                                 lec_arp_put(tmp);
2409                         }
2410                         hlist_del(&entry->next);
2411                         lec_arp_add(priv, entry);
2412                         goto out;
2413                 }
2414         }
2415         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2416 out:
2417         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2418 }
2419
2420 MODULE_LICENSE("GPL");