net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/bitops.h>
   9 #include <linux/capability.h>
  10
  11 /* We are ethernet device */
  12 #include <linux/if_ether.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <net/sock.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/ip.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/uaccess.h>
  20 #include <net/arp.h>
  21 #include <net/dst.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/seq_file.h>
  25
  26 /* TokenRing if needed */
  27 #ifdef CONFIG_TR
  28 #include <linux/trdevice.h>
  29 #endif
  30
  31 /* And atm device */
  32 #include <linux/atmdev.h>
  33 #include <linux/atmlec.h>
  34
  35 /* Proxy LEC knows about bridging */
  36 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  37 #include "../bridge/br_private.h"
  38
  39 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  40 #endif
  41
  42 /* Modular too */
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45
  46 #include "lec.h"
  47 #include "lec_arpc.h"
  48 #include "resources.h"
  49
  50 #define DUMP_PACKETS 0          /*
  51                                  * 0 = None,
  52                                  * 1 = 30 first bytes
  53                                  * 2 = Whole packet
  54                                  */
  55
  56 #define LEC_UNRES_QUE_LEN 8     /*
  57                                  * number of tx packets to queue for a
  58                                  * single destination while waiting for SVC
  59                                  */
  60
  61 static int lec_open(struct net_device *dev);
  62 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
  63 static int lec_close(struct net_device *dev);
  64 static void lec_init(struct net_device *dev);
  65 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  66                                           const unsigned char *mac_addr);
  67 static int lec_arp_remove(struct lec_priv *priv,
  68                           struct lec_arp_table *to_remove);
  69 /* LANE2 functions */
  70 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  71                                 const u8 *tlvs, u32 sizeoftlvs);
  72 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  73                          u8 **tlvs, u32 *sizeoftlvs);
  74 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  75                                const u8 *tlvs, u32 sizeoftlvs);
  76
  77 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  78                            unsigned long permanent);
  79 static void lec_arp_check_empties(struct lec_priv *priv,
  80                                   struct atm_vcc *vcc, struct sk_buff *skb);
  81 static void lec_arp_destroy(struct lec_priv *priv);
  82 static void lec_arp_init(struct lec_priv *priv);
  83 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  84                                        const unsigned char *mac_to_find,
  85                                        int is_rdesc,
  86                                        struct lec_arp_table **ret_entry);
  87 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  88                            const unsigned char *atm_addr, unsigned long remoteflag,
  89                            unsigned int targetless_le_arp);
  90 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  91 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  92 static void lec_set_flush_tran_id(struct lec_priv *priv,
  93                                   const unsigned char *atm_addr,
  94                                   unsigned long tran_id);
  95 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
  96                           struct atm_vcc *vcc,
  97                           void (*old_push) (struct atm_vcc *vcc,
  98                                             struct sk_buff *skb));
  99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 100
 101 /* must be done under lec_arp_lock */
 102 static inline void lec_arp_hold(struct lec_arp_table *entry)
 103 {
 104         atomic_inc(&entry->usage);
 105 }
 106
 107 static inline void lec_arp_put(struct lec_arp_table *entry)
 108 {
 109         if (atomic_dec_and_test(&entry->usage))
 110                 kfree(entry);
 111 }
 112
 113
 114 static struct lane2_ops lane2_ops = {
 115         lane2_resolve,          /* resolve,             spec 3.1.3 */
 116         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 117         NULL                    /* associate indicator, spec 3.1.5 */
 118 };
 119
 120 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 121
 122 /* Device structures */
 123 static struct net_device *dev_lec[MAX_LEC_ITF];
 124
 125 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 126 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 127 {
 128         struct ethhdr *eth;
 129         char *buff;
 130         struct lec_priv *priv;
 131
 132         /*
 133          * Check if this is a BPDU. If so, ask zeppelin to send
 134          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 135          * as the Config BPDU has
 136          */
 137         eth = (struct ethhdr *)skb->data;
 138         buff = skb->data + skb->dev->hard_header_len;
 139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 140                 struct sock *sk;
 141                 struct sk_buff *skb2;
 142                 struct atmlec_msg *mesg;
 143
 144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 145                 if (skb2 == NULL)
 146                         return;
 147                 skb2->len = sizeof(struct atmlec_msg);
 148                 mesg = (struct atmlec_msg *)skb2->data;
 149                 mesg->type = l_topology_change;
 150                 buff += 4;
 151                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 152
 153                 priv = netdev_priv(dev);
 154                 atm_force_charge(priv->lecd, skb2->truesize);
 155                 sk = sk_atm(priv->lecd);
 156                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 157                 sk->sk_data_ready(sk, skb2->len);
 158         }
 159
 160         return;
 161 }
 162 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 163
 164 /*
 165  * Modelled after tr_type_trans
 166  * All multicast and ARE or STE frames go to BUS.
 167  * Non source routed frames go by destination address.
 168  * Last hop source routed frames go by destination address.
 169  * Not last hop source routed frames go by _next_ route descriptor.
 170  * Returns pointer to destination MAC address or fills in rdesc
 171  * and returns NULL.
 172  */
 173 #ifdef CONFIG_TR
 174 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 175 {
 176         struct trh_hdr *trh;
 177         unsigned int riflen, num_rdsc;
 178
 179         trh = (struct trh_hdr *)packet;
 180         if (trh->daddr[0] & (uint8_t) 0x80)
 181                 return bus_mac; /* multicast */
 182
 183         if (trh->saddr[0] & TR_RII) {
 184                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 185                 if ((ntohs(trh->rcf) >> 13) != 0)
 186                         return bus_mac; /* ARE or STE */
 187         } else
 188                 return trh->daddr;      /* not source routed */
 189
 190         if (riflen < 6)
 191                 return trh->daddr;      /* last hop, source routed */
 192
 193         /* riflen is 6 or more, packet has more than one route descriptor */
 194         num_rdsc = (riflen / 2) - 1;
 195         memset(rdesc, 0, ETH_ALEN);
 196         /* offset 4 comes from LAN destination field in LE control frames */
 197         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 198                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 199         else {
 200                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 201                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 202         }
 203
 204         return NULL;
 205 }
 206 #endif /* CONFIG_TR */
 207
 208 /*
 209  * Open/initialize the netdevice. This is called (in the current kernel)
 210  * sometime after booting when the 'ifconfig' program is run.
 211  *
 212  * This routine should set everything up anew at each open, even
 213  * registers that "should" only need to be set once at boot, so that
 214  * there is non-reboot way to recover if something goes wrong.
 215  */
 216
 217 static int lec_open(struct net_device *dev)
 218 {
 219         netif_start_queue(dev);
 220         memset(&dev->stats, 0, sizeof(struct net_device_stats));
 221
 222         return 0;
 223 }
 224
 225 static void
 226 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 227 {
 228         struct net_device *dev = skb->dev;
 229
 230         ATM_SKB(skb)->vcc = vcc;
 231         ATM_SKB(skb)->atm_options = vcc->atm_options;
 232
 233         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 234         if (vcc->send(vcc, skb) < 0) {
 235                 dev->stats.tx_dropped++;
 236                 return;
 237         }
 238
 239         dev->stats.tx_packets++;
 240         dev->stats.tx_bytes += skb->len;
 241 }
 242
 243 static void lec_tx_timeout(struct net_device *dev)
 244 {
 245         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 246         dev->trans_start = jiffies;
 247         netif_wake_queue(dev);
 248 }
 249
 250 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 251 {
 252         struct sk_buff *skb2;
 253         struct lec_priv *priv = netdev_priv(dev);
 254         struct lecdatahdr_8023 *lec_h;
 255         struct atm_vcc *vcc;
 256         struct lec_arp_table *entry;
 257         unsigned char *dst;
 258         int min_frame_size;
 259 #ifdef CONFIG_TR
 260         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 261 #endif
 262         int is_rdesc;
 263 #if DUMP_PACKETS > 0
 264         char buf[300];
 265         int i = 0;
 266 #endif /* DUMP_PACKETS >0 */
 267
 268         pr_debug("lec_start_xmit called\n");
 269         if (!priv->lecd) {
 270                 printk("%s:No lecd attached\n", dev->name);
 271                 dev->stats.tx_errors++;
 272                 netif_stop_queue(dev);
 273                 kfree_skb(skb);
 274                 return NETDEV_TX_OK;
 275         }
 276
 277         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 278                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 279                 (long)skb_end_pointer(skb));
 280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 281         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 282                 lec_handle_bridge(skb, dev);
 283 #endif
 284
 285         /* Make sure we have room for lec_id */
 286         if (skb_headroom(skb) < 2) {
 287
 288                 pr_debug("lec_start_xmit: 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 > 0
 316         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 317                skb->len, priv->lecid);
 318 #if DUMP_PACKETS >= 2
 319         for (i = 0; i < skb->len && i < 99; i++) {
 320                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 321         }
 322 #elif DUMP_PACKETS >= 1
 323         for (i = 0; i < skb->len && i < 30; i++) {
 324                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 325         }
 326 #endif /* DUMP_PACKETS >= 1 */
 327         if (i == skb->len)
 328                 printk("%s\n", buf);
 329         else
 330                 printk("%s...\n", buf);
 331 #endif /* DUMP_PACKETS > 0 */
 332
 333         /* Minimum ethernet-frame size */
 334 #ifdef CONFIG_TR
 335         if (priv->is_trdev)
 336                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 337         else
 338 #endif
 339                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 340         if (skb->len < min_frame_size) {
 341                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 342                         skb2 = skb_copy_expand(skb, 0,
 343                                                min_frame_size - skb->truesize,
 344                                                GFP_ATOMIC);
 345                         dev_kfree_skb(skb);
 346                         if (skb2 == NULL) {
 347                                 dev->stats.tx_dropped++;
 348                                 return NETDEV_TX_OK;
 349                         }
 350                         skb = skb2;
 351                 }
 352                 skb_put(skb, min_frame_size - skb->len);
 353         }
 354
 355         /* Send to right vcc */
 356         is_rdesc = 0;
 357         dst = lec_h->h_dest;
 358 #ifdef CONFIG_TR
 359         if (priv->is_trdev) {
 360                 dst = get_tr_dst(skb->data + 2, rdesc);
 361                 if (dst == NULL) {
 362                         dst = rdesc;
 363                         is_rdesc = 1;
 364                 }
 365         }
 366 #endif
 367         entry = NULL;
 368         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 369         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 370                 vcc, vcc ? vcc->flags : 0, entry);
 371         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 372                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 373                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 374                                 dev->name);
 375                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 376                         skb_queue_tail(&entry->tx_wait, skb);
 377                 } else {
 378                         pr_debug
 379                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 380                              dev->name);
 381                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 382                         dev->stats.tx_dropped++;
 383                         dev_kfree_skb(skb);
 384                 }
 385                 goto out;
 386         }
 387 #if DUMP_PACKETS > 0
 388         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 389 #endif /* DUMP_PACKETS > 0 */
 390
 391         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 392                 pr_debug("lec.c: emptying tx queue, ");
 393                 pr_debug("MAC address %pM\n", lec_h->h_dest);
 394                 lec_send(vcc, skb2);
 395         }
 396
 397         lec_send(vcc, skb);
 398
 399         if (!atm_may_send(vcc, 0)) {
 400                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 401
 402                 vpriv->xoff = 1;
 403                 netif_stop_queue(dev);
 404
 405                 /*
 406                  * vcc->pop() might have occurred in between, making
 407                  * the vcc usuable again.  Since xmit is serialized,
 408                  * this is the only situation we have to re-test.
 409                  */
 410
 411                 if (atm_may_send(vcc, 0))
 412                         netif_wake_queue(dev);
 413         }
 414
 415 out:
 416         if (entry)
 417                 lec_arp_put(entry);
 418         dev->trans_start = jiffies;
 419         return NETDEV_TX_OK;
 420 }
 421
 422 /* The inverse routine to net_open(). */
 423 static int lec_close(struct net_device *dev)
 424 {
 425         netif_stop_queue(dev);
 426         return 0;
 427 }
 428
 429 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 430 {
 431         unsigned long flags;
 432         struct net_device *dev = (struct net_device *)vcc->proto_data;
 433         struct lec_priv *priv = netdev_priv(dev);
 434         struct atmlec_msg *mesg;
 435         struct lec_arp_table *entry;
 436         int i;
 437         char *tmp;              /* FIXME */
 438
 439         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 440         mesg = (struct atmlec_msg *)skb->data;
 441         tmp = skb->data;
 442         tmp += sizeof(struct atmlec_msg);
 443         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 444         switch (mesg->type) {
 445         case l_set_mac_addr:
 446                 for (i = 0; i < 6; i++) {
 447                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 448                 }
 449                 break;
 450         case l_del_mac_addr:
 451                 for (i = 0; i < 6; i++) {
 452                         dev->dev_addr[i] = 0;
 453                 }
 454                 break;
 455         case l_addr_delete:
 456                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 457                                 mesg->content.normal.flag);
 458                 break;
 459         case l_topology_change:
 460                 priv->topology_change = mesg->content.normal.flag;
 461                 break;
 462         case l_flush_complete:
 463                 lec_flush_complete(priv, mesg->content.normal.flag);
 464                 break;
 465         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 466                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 467                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 468                 lec_arp_remove(priv, entry);
 469                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 470
 471                 if (mesg->content.normal.no_source_le_narp)
 472                         break;
 473                 /* FALL THROUGH */
 474         case l_arp_update:
 475                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 476                                mesg->content.normal.atm_addr,
 477                                mesg->content.normal.flag,
 478                                mesg->content.normal.targetless_le_arp);
 479                 pr_debug("lec: in l_arp_update\n");
 480                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 481                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 482                                 mesg->sizeoftlvs);
 483                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 484                                             tmp, mesg->sizeoftlvs);
 485                 }
 486                 break;
 487         case l_config:
 488                 priv->maximum_unknown_frame_count =
 489                     mesg->content.config.maximum_unknown_frame_count;
 490                 priv->max_unknown_frame_time =
 491                     (mesg->content.config.max_unknown_frame_time * HZ);
 492                 priv->max_retry_count = mesg->content.config.max_retry_count;
 493                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 494                 priv->forward_delay_time =
 495                     (mesg->content.config.forward_delay_time * HZ);
 496                 priv->arp_response_time =
 497                     (mesg->content.config.arp_response_time * HZ);
 498                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 499                 priv->path_switching_delay =
 500                     (mesg->content.config.path_switching_delay * HZ);
 501                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 502                 priv->lane2_ops = NULL;
 503                 if (priv->lane_version > 1)
 504                         priv->lane2_ops = &lane2_ops;
 505                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 506                         printk("%s: change_mtu to %d failed\n", dev->name,
 507                                mesg->content.config.mtu);
 508                 priv->is_proxy = mesg->content.config.is_proxy;
 509                 break;
 510         case l_flush_tran_id:
 511                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 512                                       mesg->content.normal.flag);
 513                 break;
 514         case l_set_lecid:
 515                 priv->lecid =
 516                     (unsigned short)(0xffff & mesg->content.normal.flag);
 517                 break;
 518         case l_should_bridge:
 519 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 520                 {
 521                         pr_debug("%s: bridge zeppelin asks about %pM\n",
 522                                  dev->name, mesg->content.proxy.mac_addr);
 523
 524                         if (br_fdb_test_addr_hook == NULL)
 525                                 break;
 526
 527                         if (br_fdb_test_addr_hook(dev,
 528                                         mesg->content.proxy.mac_addr)) {
 529                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 530                                 struct sk_buff *skb2;
 531                                 struct sock *sk;
 532
 533                                 pr_debug
 534                                     ("%s: entry found, responding to zeppelin\n",
 535                                      dev->name);
 536                                 skb2 =
 537                                     alloc_skb(sizeof(struct atmlec_msg),
 538                                               GFP_ATOMIC);
 539                                 if (skb2 == NULL)
 540                                         break;
 541                                 skb2->len = sizeof(struct atmlec_msg);
 542                                 skb_copy_to_linear_data(skb2, mesg,
 543                                                         sizeof(*mesg));
 544                                 atm_force_charge(priv->lecd, skb2->truesize);
 545                                 sk = sk_atm(priv->lecd);
 546                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 547                                 sk->sk_data_ready(sk, skb2->len);
 548                         }
 549                 }
 550 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 551                 break;
 552         default:
 553                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 554                 dev_kfree_skb(skb);
 555                 return -EINVAL;
 556         }
 557         dev_kfree_skb(skb);
 558         return 0;
 559 }
 560
 561 static void lec_atm_close(struct atm_vcc *vcc)
 562 {
 563         struct sk_buff *skb;
 564         struct net_device *dev = (struct net_device *)vcc->proto_data;
 565         struct lec_priv *priv = netdev_priv(dev);
 566
 567         priv->lecd = NULL;
 568         /* Do something needful? */
 569
 570         netif_stop_queue(dev);
 571         lec_arp_destroy(priv);
 572
 573         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 574                 printk("%s lec_atm_close: closing with messages pending\n",
 575                        dev->name);
 576         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 577                 atm_return(vcc, skb->truesize);
 578                 dev_kfree_skb(skb);
 579         }
 580
 581         printk("%s: Shut down!\n", dev->name);
 582         module_put(THIS_MODULE);
 583 }
 584
 585 static struct atmdev_ops lecdev_ops = {
 586         .close = lec_atm_close,
 587         .send = lec_atm_send
 588 };
 589
 590 static struct atm_dev lecatm_dev = {
 591         .ops = &lecdev_ops,
 592         .type = "lec",
 593         .number = 999,          /* dummy device number */
 594         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 595 };
 596
 597 /*
 598  * LANE2: new argument struct sk_buff *data contains
 599  * the LE_ARP based TLVs introduced in the LANE2 spec
 600  */
 601 static int
 602 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 603              const unsigned char *mac_addr, const unsigned char *atm_addr,
 604              struct sk_buff *data)
 605 {
 606         struct sock *sk;
 607         struct sk_buff *skb;
 608         struct atmlec_msg *mesg;
 609
 610         if (!priv || !priv->lecd) {
 611                 return -1;
 612         }
 613         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 614         if (!skb)
 615                 return -1;
 616         skb->len = sizeof(struct atmlec_msg);
 617         mesg = (struct atmlec_msg *)skb->data;
 618         memset(mesg, 0, sizeof(struct atmlec_msg));
 619         mesg->type = type;
 620         if (data != NULL)
 621                 mesg->sizeoftlvs = data->len;
 622         if (mac_addr)
 623                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 624         else
 625                 mesg->content.normal.targetless_le_arp = 1;
 626         if (atm_addr)
 627                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 628
 629         atm_force_charge(priv->lecd, skb->truesize);
 630         sk = sk_atm(priv->lecd);
 631         skb_queue_tail(&sk->sk_receive_queue, skb);
 632         sk->sk_data_ready(sk, skb->len);
 633
 634         if (data != NULL) {
 635                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 636                 atm_force_charge(priv->lecd, data->truesize);
 637                 skb_queue_tail(&sk->sk_receive_queue, data);
 638                 sk->sk_data_ready(sk, skb->len);
 639         }
 640
 641         return 0;
 642 }
 643
 644 /* shamelessly stolen from drivers/net/net_init.c */
 645 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 646 {
 647         if ((new_mtu < 68) || (new_mtu > 18190))
 648                 return -EINVAL;
 649         dev->mtu = new_mtu;
 650         return 0;
 651 }
 652
 653 static void lec_set_multicast_list(struct net_device *dev)
 654 {
 655         /*
 656          * by default, all multicast frames arrive over the bus.
 657          * eventually support selective multicast service
 658          */
 659         return;
 660 }
 661
 662 static const struct net_device_ops lec_netdev_ops = {
 663         .ndo_open               = lec_open,
 664         .ndo_stop               = lec_close,
 665         .ndo_start_xmit         = lec_start_xmit,
 666         .ndo_change_mtu         = lec_change_mtu,
 667         .ndo_tx_timeout         = lec_tx_timeout,
 668         .ndo_set_multicast_list = lec_set_multicast_list,
 669 };
 670
 671
 672 static void lec_init(struct net_device *dev)
 673 {
 674         dev->netdev_ops = &lec_netdev_ops;
 675         printk("%s: Initialized!\n", dev->name);
 676 }
 677
 678 static const unsigned char lec_ctrl_magic[] = {
 679         0xff,
 680         0x00,
 681         0x01,
 682         0x01
 683 };
 684
 685 #define LEC_DATA_DIRECT_8023  2
 686 #define LEC_DATA_DIRECT_8025  3
 687
 688 static int lec_is_data_direct(struct atm_vcc *vcc)
 689 {
 690         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 691                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 692 }
 693
 694 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 695 {
 696         unsigned long flags;
 697         struct net_device *dev = (struct net_device *)vcc->proto_data;
 698         struct lec_priv *priv = netdev_priv(dev);
 699
 700 #if DUMP_PACKETS >0
 701         int i = 0;
 702         char buf[300];
 703
 704         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 705                vcc->vpi, vcc->vci);
 706 #endif
 707         if (!skb) {
 708                 pr_debug("%s: null skb\n", dev->name);
 709                 lec_vcc_close(priv, vcc);
 710                 return;
 711         }
 712 #if DUMP_PACKETS > 0
 713         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 714                skb->len, priv->lecid);
 715 #if DUMP_PACKETS >= 2
 716         for (i = 0; i < skb->len && i < 99; i++) {
 717                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 718         }
 719 #elif DUMP_PACKETS >= 1
 720         for (i = 0; i < skb->len && i < 30; i++) {
 721                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 722         }
 723 #endif /* DUMP_PACKETS >= 1 */
 724         if (i == skb->len)
 725                 printk("%s\n", buf);
 726         else
 727                 printk("%s...\n", buf);
 728 #endif /* DUMP_PACKETS > 0 */
 729         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 730                 struct sock *sk = sk_atm(vcc);
 731
 732                 pr_debug("%s: To daemon\n", dev->name);
 733                 skb_queue_tail(&sk->sk_receive_queue, skb);
 734                 sk->sk_data_ready(sk, skb->len);
 735         } else {                /* Data frame, queue to protocol handlers */
 736                 struct lec_arp_table *entry;
 737                 unsigned char *src, *dst;
 738
 739                 atm_return(vcc, skb->truesize);
 740                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 741                     !priv->lecd || !(dev->flags & IFF_UP)) {
 742                         /*
 743                          * Probably looping back, or if lecd is missing,
 744                          * lecd has gone down
 745                          */
 746                         pr_debug("Ignoring frame...\n");
 747                         dev_kfree_skb(skb);
 748                         return;
 749                 }
 750 #ifdef CONFIG_TR
 751                 if (priv->is_trdev)
 752                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 753                 else
 754 #endif
 755                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 756
 757                 /*
 758                  * If this is a Data Direct VCC, and the VCC does not match
 759                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 760                  */
 761                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 762                 if (lec_is_data_direct(vcc)) {
 763 #ifdef CONFIG_TR
 764                         if (priv->is_trdev)
 765                                 src =
 766                                     ((struct lecdatahdr_8025 *)skb->data)->
 767                                     h_source;
 768                         else
 769 #endif
 770                                 src =
 771                                     ((struct lecdatahdr_8023 *)skb->data)->
 772                                     h_source;
 773                         entry = lec_arp_find(priv, src);
 774                         if (entry && entry->vcc != vcc) {
 775                                 lec_arp_remove(priv, entry);
 776                                 lec_arp_put(entry);
 777                         }
 778                 }
 779                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 780
 781                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 782                     !priv->is_proxy &&  /* Proxy wants all the packets */
 783                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 784                         dev_kfree_skb(skb);
 785                         return;
 786                 }
 787                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 788                         lec_arp_check_empties(priv, vcc, skb);
 789                 }
 790                 skb_pull(skb, 2);       /* skip lec_id */
 791 #ifdef CONFIG_TR
 792                 if (priv->is_trdev)
 793                         skb->protocol = tr_type_trans(skb, dev);
 794                 else
 795 #endif
 796                         skb->protocol = eth_type_trans(skb, dev);
 797                 dev->stats.rx_packets++;
 798                 dev->stats.rx_bytes += skb->len;
 799                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 800                 netif_rx(skb);
 801         }
 802 }
 803
 804 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 805 {
 806         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 807         struct net_device *dev = skb->dev;
 808
 809         if (vpriv == NULL) {
 810                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 811                 return;
 812         }
 813
 814         vpriv->old_pop(vcc, skb);
 815
 816         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 817                 vpriv->xoff = 0;
 818                 if (netif_running(dev) && netif_queue_stopped(dev))
 819                         netif_wake_queue(dev);
 820         }
 821 }
 822
 823 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 824 {
 825         struct lec_vcc_priv *vpriv;
 826         int bytes_left;
 827         struct atmlec_ioc ioc_data;
 828
 829         /* Lecd must be up in this case */
 830         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 831         if (bytes_left != 0) {
 832                 printk
 833                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 834                      bytes_left);
 835         }
 836         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 837             !dev_lec[ioc_data.dev_num])
 838                 return -EINVAL;
 839         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 840                 return -ENOMEM;
 841         vpriv->xoff = 0;
 842         vpriv->old_pop = vcc->pop;
 843         vcc->user_back = vpriv;
 844         vcc->pop = lec_pop;
 845         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 846                       &ioc_data, vcc, vcc->push);
 847         vcc->proto_data = dev_lec[ioc_data.dev_num];
 848         vcc->push = lec_push;
 849         return 0;
 850 }
 851
 852 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 853 {
 854         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 855                 return -EINVAL;
 856         vcc->proto_data = dev_lec[arg];
 857         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 858                                 vcc);
 859 }
 860
 861 /* Initialize device. */
 862 static int lecd_attach(struct atm_vcc *vcc, int arg)
 863 {
 864         int i;
 865         struct lec_priv *priv;
 866
 867         if (arg < 0)
 868                 i = 0;
 869         else
 870                 i = arg;
 871 #ifdef CONFIG_TR
 872         if (arg >= MAX_LEC_ITF)
 873                 return -EINVAL;
 874 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 875         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 876                 return -EINVAL;
 877 #endif
 878         if (!dev_lec[i]) {
 879                 int is_trdev, size;
 880
 881                 is_trdev = 0;
 882                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 883                         is_trdev = 1;
 884
 885                 size = sizeof(struct lec_priv);
 886 #ifdef CONFIG_TR
 887                 if (is_trdev)
 888                         dev_lec[i] = alloc_trdev(size);
 889                 else
 890 #endif
 891                         dev_lec[i] = alloc_etherdev(size);
 892                 if (!dev_lec[i])
 893                         return -ENOMEM;
 894                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 895                 if (register_netdev(dev_lec[i])) {
 896                         free_netdev(dev_lec[i]);
 897                         return -EINVAL;
 898                 }
 899
 900                 priv = netdev_priv(dev_lec[i]);
 901                 priv->is_trdev = is_trdev;
 902                 lec_init(dev_lec[i]);
 903         } else {
 904                 priv = netdev_priv(dev_lec[i]);
 905                 if (priv->lecd)
 906                         return -EADDRINUSE;
 907         }
 908         lec_arp_init(priv);
 909         priv->itfnum = i;       /* LANE2 addition */
 910         priv->lecd = vcc;
 911         vcc->dev = &lecatm_dev;
 912         vcc_insert_socket(sk_atm(vcc));
 913
 914         vcc->proto_data = dev_lec[i];
 915         set_bit(ATM_VF_META, &vcc->flags);
 916         set_bit(ATM_VF_READY, &vcc->flags);
 917
 918         /* Set default values to these variables */
 919         priv->maximum_unknown_frame_count = 1;
 920         priv->max_unknown_frame_time = (1 * HZ);
 921         priv->vcc_timeout_period = (1200 * HZ);
 922         priv->max_retry_count = 1;
 923         priv->aging_time = (300 * HZ);
 924         priv->forward_delay_time = (15 * HZ);
 925         priv->topology_change = 0;
 926         priv->arp_response_time = (1 * HZ);
 927         priv->flush_timeout = (4 * HZ);
 928         priv->path_switching_delay = (6 * HZ);
 929
 930         if (dev_lec[i]->flags & IFF_UP) {
 931                 netif_start_queue(dev_lec[i]);
 932         }
 933         __module_get(THIS_MODULE);
 934         return i;
 935 }
 936
 937 #ifdef CONFIG_PROC_FS
 938 static const char *lec_arp_get_status_string(unsigned char status)
 939 {
 940         static const char *const lec_arp_status_string[] = {
 941                 "ESI_UNKNOWN       ",
 942                 "ESI_ARP_PENDING   ",
 943                 "ESI_VC_PENDING    ",
 944                 "<Undefined>       ",
 945                 "ESI_FLUSH_PENDING ",
 946                 "ESI_FORWARD_DIRECT"
 947         };
 948
 949         if (status > ESI_FORWARD_DIRECT)
 950                 status = 3;     /* ESI_UNDEFINED */
 951         return lec_arp_status_string[status];
 952 }
 953
 954 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 955 {
 956         int i;
 957
 958         for (i = 0; i < ETH_ALEN; i++)
 959                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 960         seq_printf(seq, " ");
 961         for (i = 0; i < ATM_ESA_LEN; i++)
 962                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 963         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 964                    entry->flags & 0xffff);
 965         if (entry->vcc)
 966                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 967         else
 968                 seq_printf(seq, "        ");
 969         if (entry->recv_vcc) {
 970                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 971                            entry->recv_vcc->vci);
 972         }
 973         seq_putc(seq, '\n');
 974 }
 975
 976 struct lec_state {
 977         unsigned long flags;
 978         struct lec_priv *locked;
 979         struct hlist_node *node;
 980         struct net_device *dev;
 981         int itf;
 982         int arp_table;
 983         int misc_table;
 984 };
 985
 986 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 987                           loff_t *l)
 988 {
 989         struct hlist_node *e = state->node;
 990         struct lec_arp_table *tmp;
 991
 992         if (!e)
 993                 e = tbl->first;
 994         if (e == SEQ_START_TOKEN) {
 995                 e = tbl->first;
 996                 --*l;
 997         }
 998
 999         hlist_for_each_entry_from(tmp, e, next) {
1000                 if (--*l < 0)
1001                         break;
1002         }
1003         state->node = e;
1004
1005         return (*l < 0) ? state : NULL;
1006 }
1007
1008 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1009                           struct lec_priv *priv)
1010 {
1011         void *v = NULL;
1012         int p;
1013
1014         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1015                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1016                 if (v)
1017                         break;
1018         }
1019         state->arp_table = p;
1020         return v;
1021 }
1022
1023 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1024                            struct lec_priv *priv)
1025 {
1026         struct hlist_head *lec_misc_tables[] = {
1027                 &priv->lec_arp_empty_ones,
1028                 &priv->lec_no_forward,
1029                 &priv->mcast_fwds
1030         };
1031         void *v = NULL;
1032         int q;
1033
1034         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1035                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1036                 if (v)
1037                         break;
1038         }
1039         state->misc_table = q;
1040         return v;
1041 }
1042
1043 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1044                            struct lec_priv *priv)
1045 {
1046         if (!state->locked) {
1047                 state->locked = priv;
1048                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1049         }
1050         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1051                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1052                 state->locked = NULL;
1053                 /* Partial state reset for the next time we get called */
1054                 state->arp_table = state->misc_table = 0;
1055         }
1056         return state->locked;
1057 }
1058
1059 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1060 {
1061         struct net_device *dev;
1062         void *v;
1063
1064         dev = state->dev ? state->dev : dev_lec[state->itf];
1065         v = (dev && netdev_priv(dev)) ?
1066                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1067         if (!v && dev) {
1068                 dev_put(dev);
1069                 /* Partial state reset for the next time we get called */
1070                 dev = NULL;
1071         }
1072         state->dev = dev;
1073         return v;
1074 }
1075
1076 static void *lec_get_idx(struct lec_state *state, loff_t l)
1077 {
1078         void *v = NULL;
1079
1080         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1081                 v = lec_itf_walk(state, &l);
1082                 if (v)
1083                         break;
1084         }
1085         return v;
1086 }
1087
1088 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1089 {
1090         struct lec_state *state = seq->private;
1091
1092         state->itf = 0;
1093         state->dev = NULL;
1094         state->locked = NULL;
1095         state->arp_table = 0;
1096         state->misc_table = 0;
1097         state->node = SEQ_START_TOKEN;
1098
1099         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1100 }
1101
1102 static void lec_seq_stop(struct seq_file *seq, void *v)
1103 {
1104         struct lec_state *state = seq->private;
1105
1106         if (state->dev) {
1107                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1108                                        state->flags);
1109                 dev_put(state->dev);
1110         }
1111 }
1112
1113 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1114 {
1115         struct lec_state *state = seq->private;
1116
1117         v = lec_get_idx(state, 1);
1118         *pos += !!PTR_ERR(v);
1119         return v;
1120 }
1121
1122 static int lec_seq_show(struct seq_file *seq, void *v)
1123 {
1124         static const char lec_banner[] =
1125             "Itf  MAC          ATM destination"
1126             "                          Status            Flags "
1127             "VPI/VCI Recv VPI/VCI\n";
1128
1129         if (v == SEQ_START_TOKEN)
1130                 seq_puts(seq, lec_banner);
1131         else {
1132                 struct lec_state *state = seq->private;
1133                 struct net_device *dev = state->dev;
1134                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1135
1136                 seq_printf(seq, "%s ", dev->name);
1137                 lec_info(seq, entry);
1138         }
1139         return 0;
1140 }
1141
1142 static const struct seq_operations lec_seq_ops = {
1143         .start = lec_seq_start,
1144         .next = lec_seq_next,
1145         .stop = lec_seq_stop,
1146         .show = lec_seq_show,
1147 };
1148
1149 static int lec_seq_open(struct inode *inode, struct file *file)
1150 {
1151         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1152 }
1153
1154 static const struct file_operations lec_seq_fops = {
1155         .owner = THIS_MODULE,
1156         .open = lec_seq_open,
1157         .read = seq_read,
1158         .llseek = seq_lseek,
1159         .release = seq_release_private,
1160 };
1161 #endif
1162
1163 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1164 {
1165         struct atm_vcc *vcc = ATM_SD(sock);
1166         int err = 0;
1167
1168         switch (cmd) {
1169         case ATMLEC_CTRL:
1170         case ATMLEC_MCAST:
1171         case ATMLEC_DATA:
1172                 if (!capable(CAP_NET_ADMIN))
1173                         return -EPERM;
1174                 break;
1175         default:
1176                 return -ENOIOCTLCMD;
1177         }
1178
1179         switch (cmd) {
1180         case ATMLEC_CTRL:
1181                 err = lecd_attach(vcc, (int)arg);
1182                 if (err >= 0)
1183                         sock->state = SS_CONNECTED;
1184                 break;
1185         case ATMLEC_MCAST:
1186                 err = lec_mcast_attach(vcc, (int)arg);
1187                 break;
1188         case ATMLEC_DATA:
1189                 err = lec_vcc_attach(vcc, (void __user *)arg);
1190                 break;
1191         }
1192
1193         return err;
1194 }
1195
1196 static struct atm_ioctl lane_ioctl_ops = {
1197         .owner = THIS_MODULE,
1198         .ioctl = lane_ioctl,
1199 };
1200
1201 static int __init lane_module_init(void)
1202 {
1203 #ifdef CONFIG_PROC_FS
1204         struct proc_dir_entry *p;
1205
1206         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1207         if (!p) {
1208                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1209                 return -ENOMEM;
1210         }
1211 #endif
1212
1213         register_atm_ioctl(&lane_ioctl_ops);
1214         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1215         return 0;
1216 }
1217
1218 static void __exit lane_module_cleanup(void)
1219 {
1220         int i;
1221         struct lec_priv *priv;
1222
1223         remove_proc_entry("lec", atm_proc_root);
1224
1225         deregister_atm_ioctl(&lane_ioctl_ops);
1226
1227         for (i = 0; i < MAX_LEC_ITF; i++) {
1228                 if (dev_lec[i] != NULL) {
1229                         priv = netdev_priv(dev_lec[i]);
1230                         unregister_netdev(dev_lec[i]);
1231                         free_netdev(dev_lec[i]);
1232                         dev_lec[i] = NULL;
1233                 }
1234         }
1235
1236         return;
1237 }
1238
1239 module_init(lane_module_init);
1240 module_exit(lane_module_cleanup);
1241
1242 /*
1243  * LANE2: 3.1.3, LE_RESOLVE.request
1244  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1245  * If sizeoftlvs == NULL the default TLVs associated with with this
1246  * lec will be used.
1247  * If dst_mac == NULL, targetless LE_ARP will be sent
1248  */
1249 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1250                          u8 **tlvs, u32 *sizeoftlvs)
1251 {
1252         unsigned long flags;
1253         struct lec_priv *priv = netdev_priv(dev);
1254         struct lec_arp_table *table;
1255         struct sk_buff *skb;
1256         int retval;
1257
1258         if (force == 0) {
1259                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1260                 table = lec_arp_find(priv, dst_mac);
1261                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1262                 if (table == NULL)
1263                         return -1;
1264
1265                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1266                 if (*tlvs == NULL)
1267                         return -1;
1268
1269                 *sizeoftlvs = table->sizeoftlvs;
1270
1271                 return 0;
1272         }
1273
1274         if (sizeoftlvs == NULL)
1275                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1276
1277         else {
1278                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1279                 if (skb == NULL)
1280                         return -1;
1281                 skb->len = *sizeoftlvs;
1282                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1283                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1284         }
1285         return retval;
1286 }
1287
1288 /*
1289  * LANE2: 3.1.4, LE_ASSOCIATE.request
1290  * Associate the *tlvs with the *lan_dst address.
1291  * Will overwrite any previous association
1292  * Returns 1 for success, 0 for failure (out of memory)
1293  *
1294  */
1295 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1296                                const u8 *tlvs, u32 sizeoftlvs)
1297 {
1298         int retval;
1299         struct sk_buff *skb;
1300         struct lec_priv *priv = netdev_priv(dev);
1301
1302         if (compare_ether_addr(lan_dst, dev->dev_addr))
1303                 return (0);     /* not our mac address */
1304
1305         kfree(priv->tlvs);      /* NULL if there was no previous association */
1306
1307         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1308         if (priv->tlvs == NULL)
1309                 return (0);
1310         priv->sizeoftlvs = sizeoftlvs;
1311
1312         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1313         if (skb == NULL)
1314                 return 0;
1315         skb->len = sizeoftlvs;
1316         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1317         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1318         if (retval != 0)
1319                 printk("lec.c: lane2_associate_req() failed\n");
1320         /*
1321          * If the previous association has changed we must
1322          * somehow notify other LANE entities about the change
1323          */
1324         return (1);
1325 }
1326
1327 /*
1328  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1329  *
1330  */
1331 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1332                                 const u8 *tlvs, u32 sizeoftlvs)
1333 {
1334 #if 0
1335         int i = 0;
1336 #endif
1337         struct lec_priv *priv = netdev_priv(dev);
1338 #if 0                           /*
1339                                  * Why have the TLVs in LE_ARP entries
1340                                  * since we do not use them? When you
1341                                  * uncomment this code, make sure the
1342                                  * TLVs get freed when entry is killed
1343                                  */
1344         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1345
1346         if (entry == NULL)
1347                 return;         /* should not happen */
1348
1349         kfree(entry->tlvs);
1350
1351         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1352         if (entry->tlvs == NULL)
1353                 return;
1354         entry->sizeoftlvs = sizeoftlvs;
1355 #endif
1356 #if 0
1357         printk("lec.c: lane2_associate_ind()\n");
1358         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1359         while (i < sizeoftlvs)
1360                 printk("%02x ", tlvs[i++]);
1361
1362         printk("\n");
1363 #endif
1364
1365         /* tell MPOA about the TLVs we saw */
1366         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1367                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1368                                                      tlvs, sizeoftlvs);
1369         }
1370         return;
1371 }
1372
1373 /*
1374  * Here starts what used to lec_arpc.c
1375  *
1376  * lec_arpc.c was added here when making
1377  * lane client modular. October 1997
1378  */
1379
1380 #include <linux/types.h>
1381 #include <linux/timer.h>
1382 #include <asm/param.h>
1383 #include <asm/atomic.h>
1384 #include <linux/inetdevice.h>
1385 #include <net/route.h>
1386
1387 #if 0
1388 #define pr_debug(format,args...)
1389 /*
1390 #define pr_debug printk
1391 */
1392 #endif
1393 #define DEBUG_ARP_TABLE 0
1394
1395 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1396
1397 static void lec_arp_check_expire(struct work_struct *work);
1398 static void lec_arp_expire_arp(unsigned long data);
1399
1400 /*
1401  * Arp table funcs
1402  */
1403
1404 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1405
1406 /*
1407  * Initialization of arp-cache
1408  */
1409 static void lec_arp_init(struct lec_priv *priv)
1410 {
1411         unsigned short i;
1412
1413         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1414                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1415         }
1416         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1417         INIT_HLIST_HEAD(&priv->lec_no_forward);
1418         INIT_HLIST_HEAD(&priv->mcast_fwds);
1419         spin_lock_init(&priv->lec_arp_lock);
1420         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1421         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1422 }
1423
1424 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1425 {
1426         if (entry->vcc) {
1427                 struct atm_vcc *vcc = entry->vcc;
1428                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1429                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1430
1431                 vcc->pop = vpriv->old_pop;
1432                 if (vpriv->xoff)
1433                         netif_wake_queue(dev);
1434                 kfree(vpriv);
1435                 vcc->user_back = NULL;
1436                 vcc->push = entry->old_push;
1437                 vcc_release_async(vcc, -EPIPE);
1438                 entry->vcc = NULL;
1439         }
1440         if (entry->recv_vcc) {
1441                 entry->recv_vcc->push = entry->old_recv_push;
1442                 vcc_release_async(entry->recv_vcc, -EPIPE);
1443                 entry->recv_vcc = NULL;
1444         }
1445 }
1446
1447 /*
1448  * Insert entry to lec_arp_table
1449  * LANE2: Add to the end of the list to satisfy 8.1.13
1450  */
1451 static inline void
1452 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1453 {
1454         struct hlist_head *tmp;
1455
1456         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1457         hlist_add_head(&entry->next, tmp);
1458
1459         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1460                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1461                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1462                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1463 }
1464
1465 /*
1466  * Remove entry from lec_arp_table
1467  */
1468 static int
1469 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1470 {
1471         struct hlist_node *node;
1472         struct lec_arp_table *entry;
1473         int i, remove_vcc = 1;
1474
1475         if (!to_remove) {
1476                 return -1;
1477         }
1478
1479         hlist_del(&to_remove->next);
1480         del_timer(&to_remove->timer);
1481
1482         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1483         if (to_remove->status >= ESI_FLUSH_PENDING) {
1484                 /*
1485                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1486                  */
1487                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1488                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1489                                 if (memcmp(to_remove->atm_addr,
1490                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1491                                         remove_vcc = 0;
1492                                         break;
1493                                 }
1494                         }
1495                 }
1496                 if (remove_vcc)
1497                         lec_arp_clear_vccs(to_remove);
1498         }
1499         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1500
1501         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1502                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1503                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1504                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1505         return 0;
1506 }
1507
1508 #if DEBUG_ARP_TABLE
1509 static const char *get_status_string(unsigned char st)
1510 {
1511         switch (st) {
1512         case ESI_UNKNOWN:
1513                 return "ESI_UNKNOWN";
1514         case ESI_ARP_PENDING:
1515                 return "ESI_ARP_PENDING";
1516         case ESI_VC_PENDING:
1517                 return "ESI_VC_PENDING";
1518         case ESI_FLUSH_PENDING:
1519                 return "ESI_FLUSH_PENDING";
1520         case ESI_FORWARD_DIRECT:
1521                 return "ESI_FORWARD_DIRECT";
1522         default:
1523                 return "<UNKNOWN>";
1524         }
1525 }
1526
1527 static void dump_arp_table(struct lec_priv *priv)
1528 {
1529         struct hlist_node *node;
1530         struct lec_arp_table *rulla;
1531         char buf[256];
1532         int i, j, offset;
1533
1534         printk("Dump %p:\n", priv);
1535         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1536                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1537                         offset = 0;
1538                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1539                         offset += sprintf(buf + offset, "Mac:");
1540                         for (j = 0; j < ETH_ALEN; j++) {
1541                                 offset += sprintf(buf + offset,
1542                                                   "%2.2x ",
1543                                                   rulla->mac_addr[j] & 0xff);
1544                         }
1545                         offset += sprintf(buf + offset, "Atm:");
1546                         for (j = 0; j < ATM_ESA_LEN; j++) {
1547                                 offset += sprintf(buf + offset,
1548                                                   "%2.2x ",
1549                                                   rulla->atm_addr[j] & 0xff);
1550                         }
1551                         offset += sprintf(buf + offset,
1552                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1553                                           rulla->vcc ? rulla->vcc->vpi : 0,
1554                                           rulla->vcc ? rulla->vcc->vci : 0,
1555                                           rulla->recv_vcc ? rulla->recv_vcc->
1556                                           vpi : 0,
1557                                           rulla->recv_vcc ? rulla->recv_vcc->
1558                                           vci : 0, rulla->last_used,
1559                                           rulla->timestamp, rulla->no_tries);
1560                         offset +=
1561                             sprintf(buf + offset,
1562                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1563                                     rulla->flags, rulla->packets_flooded,
1564                                     get_status_string(rulla->status));
1565                         printk("%s\n", buf);
1566                 }
1567         }
1568
1569         if (!hlist_empty(&priv->lec_no_forward))
1570                 printk("No forward\n");
1571         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1572                 offset = 0;
1573                 offset += sprintf(buf + offset, "Mac:");
1574                 for (j = 0; j < ETH_ALEN; j++) {
1575                         offset += sprintf(buf + offset, "%2.2x ",
1576                                           rulla->mac_addr[j] & 0xff);
1577                 }
1578                 offset += sprintf(buf + offset, "Atm:");
1579                 for (j = 0; j < ATM_ESA_LEN; j++) {
1580                         offset += sprintf(buf + offset, "%2.2x ",
1581                                           rulla->atm_addr[j] & 0xff);
1582                 }
1583                 offset += sprintf(buf + offset,
1584                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1585                                   rulla->vcc ? rulla->vcc->vpi : 0,
1586                                   rulla->vcc ? rulla->vcc->vci : 0,
1587                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1588                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1589                                   rulla->last_used,
1590                                   rulla->timestamp, rulla->no_tries);
1591                 offset += sprintf(buf + offset,
1592                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1593                                   rulla->flags, rulla->packets_flooded,
1594                                   get_status_string(rulla->status));
1595                 printk("%s\n", buf);
1596         }
1597
1598         if (!hlist_empty(&priv->lec_arp_empty_ones))
1599                 printk("Empty ones\n");
1600         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1601                 offset = 0;
1602                 offset += sprintf(buf + offset, "Mac:");
1603                 for (j = 0; j < ETH_ALEN; j++) {
1604                         offset += sprintf(buf + offset, "%2.2x ",
1605                                           rulla->mac_addr[j] & 0xff);
1606                 }
1607                 offset += sprintf(buf + offset, "Atm:");
1608                 for (j = 0; j < ATM_ESA_LEN; j++) {
1609                         offset += sprintf(buf + offset, "%2.2x ",
1610                                           rulla->atm_addr[j] & 0xff);
1611                 }
1612                 offset += sprintf(buf + offset,
1613                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1614                                   rulla->vcc ? rulla->vcc->vpi : 0,
1615                                   rulla->vcc ? rulla->vcc->vci : 0,
1616                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1617                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1618                                   rulla->last_used,
1619                                   rulla->timestamp, rulla->no_tries);
1620                 offset += sprintf(buf + offset,
1621                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1622                                   rulla->flags, rulla->packets_flooded,
1623                                   get_status_string(rulla->status));
1624                 printk("%s", buf);
1625         }
1626
1627         if (!hlist_empty(&priv->mcast_fwds))
1628                 printk("Multicast Forward VCCs\n");
1629         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1630                 offset = 0;
1631                 offset += sprintf(buf + offset, "Mac:");
1632                 for (j = 0; j < ETH_ALEN; j++) {
1633                         offset += sprintf(buf + offset, "%2.2x ",
1634                                           rulla->mac_addr[j] & 0xff);
1635                 }
1636                 offset += sprintf(buf + offset, "Atm:");
1637                 for (j = 0; j < ATM_ESA_LEN; j++) {
1638                         offset += sprintf(buf + offset, "%2.2x ",
1639                                           rulla->atm_addr[j] & 0xff);
1640                 }
1641                 offset += sprintf(buf + offset,
1642                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1643                                   rulla->vcc ? rulla->vcc->vpi : 0,
1644                                   rulla->vcc ? rulla->vcc->vci : 0,
1645                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1646                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1647                                   rulla->last_used,
1648                                   rulla->timestamp, rulla->no_tries);
1649                 offset += sprintf(buf + offset,
1650                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1651                                   rulla->flags, rulla->packets_flooded,
1652                                   get_status_string(rulla->status));
1653                 printk("%s\n", buf);
1654         }
1655
1656 }
1657 #else
1658 #define dump_arp_table(priv) do { } while (0)
1659 #endif
1660
1661 /*
1662  * Destruction of arp-cache
1663  */
1664 static void lec_arp_destroy(struct lec_priv *priv)
1665 {
1666         unsigned long flags;
1667         struct hlist_node *node, *next;
1668         struct lec_arp_table *entry;
1669         int i;
1670
1671         cancel_rearming_delayed_work(&priv->lec_arp_work);
1672
1673         /*
1674          * Remove all entries
1675          */
1676
1677         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1678         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1679                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1680                         lec_arp_remove(priv, entry);
1681                         lec_arp_put(entry);
1682                 }
1683                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1684         }
1685
1686         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1687                 del_timer_sync(&entry->timer);
1688                 lec_arp_clear_vccs(entry);
1689                 hlist_del(&entry->next);
1690                 lec_arp_put(entry);
1691         }
1692         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1693
1694         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1695                 del_timer_sync(&entry->timer);
1696                 lec_arp_clear_vccs(entry);
1697                 hlist_del(&entry->next);
1698                 lec_arp_put(entry);
1699         }
1700         INIT_HLIST_HEAD(&priv->lec_no_forward);
1701
1702         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1703                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1704                 lec_arp_clear_vccs(entry);
1705                 hlist_del(&entry->next);
1706                 lec_arp_put(entry);
1707         }
1708         INIT_HLIST_HEAD(&priv->mcast_fwds);
1709         priv->mcast_vcc = NULL;
1710         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1711 }
1712
1713 /*
1714  * Find entry by mac_address
1715  */
1716 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1717                                           const unsigned char *mac_addr)
1718 {
1719         struct hlist_node *node;
1720         struct hlist_head *head;
1721         struct lec_arp_table *entry;
1722
1723         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1724                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1725                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1726
1727         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1728         hlist_for_each_entry(entry, node, head, next) {
1729                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1730                         return entry;
1731                 }
1732         }
1733         return NULL;
1734 }
1735
1736 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1737                                         const unsigned char *mac_addr)
1738 {
1739         struct lec_arp_table *to_return;
1740
1741         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1742         if (!to_return) {
1743                 printk("LEC: Arp entry kmalloc failed\n");
1744                 return NULL;
1745         }
1746         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1747         INIT_HLIST_NODE(&to_return->next);
1748         setup_timer(&to_return->timer, lec_arp_expire_arp,
1749                         (unsigned long)to_return);
1750         to_return->last_used = jiffies;
1751         to_return->priv = priv;
1752         skb_queue_head_init(&to_return->tx_wait);
1753         atomic_set(&to_return->usage, 1);
1754         return to_return;
1755 }
1756
1757 /* Arp sent timer expired */
1758 static void lec_arp_expire_arp(unsigned long data)
1759 {
1760         struct lec_arp_table *entry;
1761
1762         entry = (struct lec_arp_table *)data;
1763
1764         pr_debug("lec_arp_expire_arp\n");
1765         if (entry->status == ESI_ARP_PENDING) {
1766                 if (entry->no_tries <= entry->priv->max_retry_count) {
1767                         if (entry->is_rdesc)
1768                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1769                                              entry->mac_addr, NULL, NULL);
1770                         else
1771                                 send_to_lecd(entry->priv, l_arp_xmt,
1772                                              entry->mac_addr, NULL, NULL);
1773                         entry->no_tries++;
1774                 }
1775                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1776         }
1777 }
1778
1779 /* Unknown/unused vcc expire, remove associated entry */
1780 static void lec_arp_expire_vcc(unsigned long data)
1781 {
1782         unsigned long flags;
1783         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1784         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1785
1786         del_timer(&to_remove->timer);
1787
1788         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1789                 to_remove, priv,
1790                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1791                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1792
1793         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1794         hlist_del(&to_remove->next);
1795         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1796
1797         lec_arp_clear_vccs(to_remove);
1798         lec_arp_put(to_remove);
1799 }
1800
1801 /*
1802  * Expire entries.
1803  * 1. Re-set timer
1804  * 2. For each entry, delete entries that have aged past the age limit.
1805  * 3. For each entry, depending on the status of the entry, perform
1806  *    the following maintenance.
1807  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1808  *       tick_count is above the max_unknown_frame_time, clear
1809  *       the tick_count to zero and clear the packets_flooded counter
1810  *       to zero. This supports the packet rate limit per address
1811  *       while flooding unknowns.
1812  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1813  *       than or equal to the path_switching_delay, change the status
1814  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1815  *       regardless of the progress of the flush protocol.
1816  */
1817 static void lec_arp_check_expire(struct work_struct *work)
1818 {
1819         unsigned long flags;
1820         struct lec_priv *priv =
1821                 container_of(work, struct lec_priv, lec_arp_work.work);
1822         struct hlist_node *node, *next;
1823         struct lec_arp_table *entry;
1824         unsigned long now;
1825         unsigned long time_to_check;
1826         int i;
1827
1828         pr_debug("lec_arp_check_expire %p\n", priv);
1829         now = jiffies;
1830 restart:
1831         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1832         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1833                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1834                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1835                             priv->topology_change)
1836                                 time_to_check = priv->forward_delay_time;
1837                         else
1838                                 time_to_check = priv->aging_time;
1839
1840                         pr_debug("About to expire: %lx - %lx > %lx\n",
1841                                 now, entry->last_used, time_to_check);
1842                         if (time_after(now, entry->last_used + time_to_check)
1843                             && !(entry->flags & LEC_PERMANENT_FLAG)
1844                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1845                                 /* Remove entry */
1846                                 pr_debug("LEC:Entry timed out\n");
1847                                 lec_arp_remove(priv, entry);
1848                                 lec_arp_put(entry);
1849                         } else {
1850                                 /* Something else */
1851                                 if ((entry->status == ESI_VC_PENDING ||
1852                                      entry->status == ESI_ARP_PENDING)
1853                                     && time_after_eq(now,
1854                                                      entry->timestamp +
1855                                                      priv->
1856                                                      max_unknown_frame_time)) {
1857                                         entry->timestamp = jiffies;
1858                                         entry->packets_flooded = 0;
1859                                         if (entry->status == ESI_VC_PENDING)
1860                                                 send_to_lecd(priv, l_svc_setup,
1861                                                              entry->mac_addr,
1862                                                              entry->atm_addr,
1863                                                              NULL);
1864                                 }
1865                                 if (entry->status == ESI_FLUSH_PENDING
1866                                     &&
1867                                     time_after_eq(now, entry->timestamp +
1868                                                   priv->path_switching_delay)) {
1869                                         struct sk_buff *skb;
1870                                         struct atm_vcc *vcc = entry->vcc;
1871
1872                                         lec_arp_hold(entry);
1873                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1874                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1875                                                 lec_send(vcc, skb);
1876                                         entry->last_used = jiffies;
1877                                         entry->status = ESI_FORWARD_DIRECT;
1878                                         lec_arp_put(entry);
1879                                         goto restart;
1880                                 }
1881                         }
1882                 }
1883         }
1884         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1885
1886         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1887 }
1888
1889 /*
1890  * Try to find vcc where mac_address is attached.
1891  *
1892  */
1893 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1894                                        const unsigned char *mac_to_find, int is_rdesc,
1895                                        struct lec_arp_table **ret_entry)
1896 {
1897         unsigned long flags;
1898         struct lec_arp_table *entry;
1899         struct atm_vcc *found;
1900
1901         if (mac_to_find[0] & 0x01) {
1902                 switch (priv->lane_version) {
1903                 case 1:
1904                         return priv->mcast_vcc;
1905                 case 2: /* LANE2 wants arp for multicast addresses */
1906                         if (!compare_ether_addr(mac_to_find, bus_mac))
1907                                 return priv->mcast_vcc;
1908                         break;
1909                 default:
1910                         break;
1911                 }
1912         }
1913
1914         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1915         entry = lec_arp_find(priv, mac_to_find);
1916
1917         if (entry) {
1918                 if (entry->status == ESI_FORWARD_DIRECT) {
1919                         /* Connection Ok */
1920                         entry->last_used = jiffies;
1921                         lec_arp_hold(entry);
1922                         *ret_entry = entry;
1923                         found = entry->vcc;
1924                         goto out;
1925                 }
1926                 /*
1927                  * If the LE_ARP cache entry is still pending, reset count to 0
1928                  * so another LE_ARP request can be made for this frame.
1929                  */
1930                 if (entry->status == ESI_ARP_PENDING) {
1931                         entry->no_tries = 0;
1932                 }
1933                 /*
1934                  * Data direct VC not yet set up, check to see if the unknown
1935                  * frame count is greater than the limit. If the limit has
1936                  * not been reached, allow the caller to send packet to
1937                  * BUS.
1938                  */
1939                 if (entry->status != ESI_FLUSH_PENDING &&
1940                     entry->packets_flooded <
1941                     priv->maximum_unknown_frame_count) {
1942                         entry->packets_flooded++;
1943                         pr_debug("LEC_ARP: Flooding..\n");
1944                         found = priv->mcast_vcc;
1945                         goto out;
1946                 }
1947                 /*
1948                  * We got here because entry->status == ESI_FLUSH_PENDING
1949                  * or BUS flood limit was reached for an entry which is
1950                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1951                  */
1952                 lec_arp_hold(entry);
1953                 *ret_entry = entry;
1954                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1955                         entry->vcc);
1956                 found = NULL;
1957         } else {
1958                 /* No matching entry was found */
1959                 entry = make_entry(priv, mac_to_find);
1960                 pr_debug("LEC_ARP: Making entry\n");
1961                 if (!entry) {
1962                         found = priv->mcast_vcc;
1963                         goto out;
1964                 }
1965                 lec_arp_add(priv, entry);
1966                 /* We want arp-request(s) to be sent */
1967                 entry->packets_flooded = 1;
1968                 entry->status = ESI_ARP_PENDING;
1969                 entry->no_tries = 1;
1970                 entry->last_used = entry->timestamp = jiffies;
1971                 entry->is_rdesc = is_rdesc;
1972                 if (entry->is_rdesc)
1973                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1974                                      NULL);
1975                 else
1976                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1977                 entry->timer.expires = jiffies + (1 * HZ);
1978                 entry->timer.function = lec_arp_expire_arp;
1979                 add_timer(&entry->timer);
1980                 found = priv->mcast_vcc;
1981         }
1982
1983 out:
1984         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1985         return found;
1986 }
1987
1988 static int
1989 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1990                 unsigned long permanent)
1991 {
1992         unsigned long flags;
1993         struct hlist_node *node, *next;
1994         struct lec_arp_table *entry;
1995         int i;
1996
1997         pr_debug("lec_addr_delete\n");
1998         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1999         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2000                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2001                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2002                             && (permanent ||
2003                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2004                                 lec_arp_remove(priv, entry);
2005                                 lec_arp_put(entry);
2006                         }
2007                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2008                         return 0;
2009                 }
2010         }
2011         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2012         return -1;
2013 }
2014
2015 /*
2016  * Notifies:  Response to arp_request (atm_addr != NULL)
2017  */
2018 static void
2019 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2020                const unsigned char *atm_addr, unsigned long remoteflag,
2021                unsigned int targetless_le_arp)
2022 {
2023         unsigned long flags;
2024         struct hlist_node *node, *next;
2025         struct lec_arp_table *entry, *tmp;
2026         int i;
2027
2028         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2029         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2030                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2031                 mac_addr[4], mac_addr[5]);
2032
2033         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2034         entry = lec_arp_find(priv, mac_addr);
2035         if (entry == NULL && targetless_le_arp)
2036                 goto out;       /*
2037                                  * LANE2: ignore targetless LE_ARPs for which
2038                                  * we have no entry in the cache. 7.1.30
2039                                  */
2040         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2041                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2042                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2043                                 hlist_del(&entry->next);
2044                                 del_timer(&entry->timer);
2045                                 tmp = lec_arp_find(priv, mac_addr);
2046                                 if (tmp) {
2047                                         del_timer(&tmp->timer);
2048                                         tmp->status = ESI_FORWARD_DIRECT;
2049                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2050                                         tmp->vcc = entry->vcc;
2051                                         tmp->old_push = entry->old_push;
2052                                         tmp->last_used = jiffies;
2053                                         del_timer(&entry->timer);
2054                                         lec_arp_put(entry);
2055                                         entry = tmp;
2056                                 } else {
2057                                         entry->status = ESI_FORWARD_DIRECT;
2058                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2059                                         entry->last_used = jiffies;
2060                                         lec_arp_add(priv, entry);
2061                                 }
2062                                 if (remoteflag)
2063                                         entry->flags |= LEC_REMOTE_FLAG;
2064                                 else
2065                                         entry->flags &= ~LEC_REMOTE_FLAG;
2066                                 pr_debug("After update\n");
2067                                 dump_arp_table(priv);
2068                                 goto out;
2069                         }
2070                 }
2071         }
2072
2073         entry = lec_arp_find(priv, mac_addr);
2074         if (!entry) {
2075                 entry = make_entry(priv, mac_addr);
2076                 if (!entry)
2077                         goto out;
2078                 entry->status = ESI_UNKNOWN;
2079                 lec_arp_add(priv, entry);
2080                 /* Temporary, changes before end of function */
2081         }
2082         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2083         del_timer(&entry->timer);
2084         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2085                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2086                         if (entry != tmp &&
2087                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2088                                 /* Vcc to this host exists */
2089                                 if (tmp->status > ESI_VC_PENDING) {
2090                                         /*
2091                                          * ESI_FLUSH_PENDING,
2092                                          * ESI_FORWARD_DIRECT
2093                                          */
2094                                         entry->vcc = tmp->vcc;
2095                                         entry->old_push = tmp->old_push;
2096                                 }
2097                                 entry->status = tmp->status;
2098                                 break;
2099                         }
2100                 }
2101         }
2102         if (remoteflag)
2103                 entry->flags |= LEC_REMOTE_FLAG;
2104         else
2105                 entry->flags &= ~LEC_REMOTE_FLAG;
2106         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2107                 entry->status = ESI_VC_PENDING;
2108                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2109         }
2110         pr_debug("After update2\n");
2111         dump_arp_table(priv);
2112 out:
2113         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2114 }
2115
2116 /*
2117  * Notifies: Vcc setup ready
2118  */
2119 static void
2120 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2121               struct atm_vcc *vcc,
2122               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2123 {
2124         unsigned long flags;
2125         struct hlist_node *node;
2126         struct lec_arp_table *entry;
2127         int i, found_entry = 0;
2128
2129         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2130         if (ioc_data->receive == 2) {
2131                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2132
2133                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2134 #if 0
2135                 entry = lec_arp_find(priv, bus_mac);
2136                 if (!entry) {
2137                         printk("LEC_ARP: Multicast entry not found!\n");
2138                         goto out;
2139                 }
2140                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2141                 entry->recv_vcc = vcc;
2142                 entry->old_recv_push = old_push;
2143 #endif
2144                 entry = make_entry(priv, bus_mac);
2145                 if (entry == NULL)
2146                         goto out;
2147                 del_timer(&entry->timer);
2148                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2149                 entry->recv_vcc = vcc;
2150                 entry->old_recv_push = old_push;
2151                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2152                 goto out;
2153         } else if (ioc_data->receive == 1) {
2154                 /*
2155                  * Vcc which we don't want to make default vcc,
2156                  * attach it anyway.
2157                  */
2158                 pr_debug
2159                     ("LEC_ARP:Attaching data direct, not default: "
2160                      "%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",
2161                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2162                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2163                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2164                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2165                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2166                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2167                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2168                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2169                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2170                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2171                 entry = make_entry(priv, bus_mac);
2172                 if (entry == NULL)
2173                         goto out;
2174                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2175                 memset(entry->mac_addr, 0, ETH_ALEN);
2176                 entry->recv_vcc = vcc;
2177                 entry->old_recv_push = old_push;
2178                 entry->status = ESI_UNKNOWN;
2179                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2180                 entry->timer.function = lec_arp_expire_vcc;
2181                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2182                 add_timer(&entry->timer);
2183                 dump_arp_table(priv);
2184                 goto out;
2185         }
2186         pr_debug
2187             ("LEC_ARP:Attaching data direct, default: "
2188              "%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",
2189              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2190              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2191              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2192              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2193              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2194              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2195              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2196              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2197              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2198              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2199         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2200                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2201                         if (memcmp
2202                             (ioc_data->atm_addr, entry->atm_addr,
2203                              ATM_ESA_LEN) == 0) {
2204                                 pr_debug("LEC_ARP: Attaching data direct\n");
2205                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2206                                         entry->vcc ? entry->vcc->vci : 0,
2207                                         entry->recv_vcc ? entry->recv_vcc->
2208                                         vci : 0);
2209                                 found_entry = 1;
2210                                 del_timer(&entry->timer);
2211                                 entry->vcc = vcc;
2212                                 entry->old_push = old_push;
2213                                 if (entry->status == ESI_VC_PENDING) {
2214                                         if (priv->maximum_unknown_frame_count
2215                                             == 0)
2216                                                 entry->status =
2217                                                     ESI_FORWARD_DIRECT;
2218                                         else {
2219                                                 entry->timestamp = jiffies;
2220                                                 entry->status =
2221                                                     ESI_FLUSH_PENDING;
2222 #if 0
2223                                                 send_to_lecd(priv, l_flush_xmt,
2224                                                              NULL,
2225                                                              entry->atm_addr,
2226                                                              NULL);
2227 #endif
2228                                         }
2229                                 } else {
2230                                         /*
2231                                          * They were forming a connection
2232                                          * to us, and we to them. Our
2233                                          * ATM address is numerically lower
2234                                          * than theirs, so we make connection
2235                                          * we formed into default VCC (8.1.11).
2236                                          * Connection they made gets torn
2237                                          * down. This might confuse some
2238                                          * clients. Can be changed if
2239                                          * someone reports trouble...
2240                                          */
2241                                         ;
2242                                 }
2243                         }
2244                 }
2245         }
2246         if (found_entry) {
2247                 pr_debug("After vcc was added\n");
2248                 dump_arp_table(priv);
2249                 goto out;
2250         }
2251         /*
2252          * Not found, snatch address from first data packet that arrives
2253          * from this vcc
2254          */
2255         entry = make_entry(priv, bus_mac);
2256         if (!entry)
2257                 goto out;
2258         entry->vcc = vcc;
2259         entry->old_push = old_push;
2260         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2261         memset(entry->mac_addr, 0, ETH_ALEN);
2262         entry->status = ESI_UNKNOWN;
2263         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2264         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2265         entry->timer.function = lec_arp_expire_vcc;
2266         add_timer(&entry->timer);
2267         pr_debug("After vcc was added\n");
2268         dump_arp_table(priv);
2269 out:
2270         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2271 }
2272
2273 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2274 {
2275         unsigned long flags;
2276         struct hlist_node *node;
2277         struct lec_arp_table *entry;
2278         int i;
2279
2280         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2281 restart:
2282         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2283         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2284                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2285                         if (entry->flush_tran_id == tran_id
2286                             && entry->status == ESI_FLUSH_PENDING) {
2287                                 struct sk_buff *skb;
2288                                 struct atm_vcc *vcc = entry->vcc;
2289
2290                                 lec_arp_hold(entry);
2291                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2292                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2293                                         lec_send(vcc, skb);
2294                                 entry->last_used = jiffies;
2295                                 entry->status = ESI_FORWARD_DIRECT;
2296                                 lec_arp_put(entry);
2297                                 pr_debug("LEC_ARP: Flushed\n");
2298                                 goto restart;
2299                         }
2300                 }
2301         }
2302         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2303         dump_arp_table(priv);
2304 }
2305
2306 static void
2307 lec_set_flush_tran_id(struct lec_priv *priv,
2308                       const unsigned char *atm_addr, unsigned long tran_id)
2309 {
2310         unsigned long flags;
2311         struct hlist_node *node;
2312         struct lec_arp_table *entry;
2313         int i;
2314
2315         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2316         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2317                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2318                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2319                                 entry->flush_tran_id = tran_id;
2320                                 pr_debug("Set flush transaction id to %lx for %p\n",
2321                                         tran_id, entry);
2322                         }
2323                 }
2324         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2325 }
2326
2327 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2328 {
2329         unsigned long flags;
2330         unsigned char mac_addr[] = {
2331                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2332         };
2333         struct lec_arp_table *to_add;
2334         struct lec_vcc_priv *vpriv;
2335         int err = 0;
2336
2337         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2338                 return -ENOMEM;
2339         vpriv->xoff = 0;
2340         vpriv->old_pop = vcc->pop;
2341         vcc->user_back = vpriv;
2342         vcc->pop = lec_pop;
2343         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2344         to_add = make_entry(priv, mac_addr);
2345         if (!to_add) {
2346                 vcc->pop = vpriv->old_pop;
2347                 kfree(vpriv);
2348                 err = -ENOMEM;
2349                 goto out;
2350         }
2351         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2352         to_add->status = ESI_FORWARD_DIRECT;
2353         to_add->flags |= LEC_PERMANENT_FLAG;
2354         to_add->vcc = vcc;
2355         to_add->old_push = vcc->push;
2356         vcc->push = lec_push;
2357         priv->mcast_vcc = vcc;
2358         lec_arp_add(priv, to_add);
2359 out:
2360         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2361         return err;
2362 }
2363
2364 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2365 {
2366         unsigned long flags;
2367         struct hlist_node *node, *next;
2368         struct lec_arp_table *entry;
2369         int i;
2370
2371         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2372         dump_arp_table(priv);
2373
2374         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2375
2376         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2377                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2378                         if (vcc == entry->vcc) {
2379                                 lec_arp_remove(priv, entry);
2380                                 lec_arp_put(entry);
2381                                 if (priv->mcast_vcc == vcc) {
2382                                         priv->mcast_vcc = NULL;
2383                                 }
2384                         }
2385                 }
2386         }
2387
2388         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2389                 if (entry->vcc == vcc) {
2390                         lec_arp_clear_vccs(entry);
2391                         del_timer(&entry->timer);
2392                         hlist_del(&entry->next);
2393                         lec_arp_put(entry);
2394                 }
2395         }
2396
2397         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2398                 if (entry->recv_vcc == vcc) {
2399                         lec_arp_clear_vccs(entry);
2400                         del_timer(&entry->timer);
2401                         hlist_del(&entry->next);
2402                         lec_arp_put(entry);
2403                 }
2404         }
2405
2406         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2407                 if (entry->recv_vcc == vcc) {
2408                         lec_arp_clear_vccs(entry);
2409                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2410                         hlist_del(&entry->next);
2411                         lec_arp_put(entry);
2412                 }
2413         }
2414
2415         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2416         dump_arp_table(priv);
2417 }
2418
2419 static void
2420 lec_arp_check_empties(struct lec_priv *priv,
2421                       struct atm_vcc *vcc, struct sk_buff *skb)
2422 {
2423         unsigned long flags;
2424         struct hlist_node *node, *next;
2425         struct lec_arp_table *entry, *tmp;
2426         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2427         unsigned char *src;
2428 #ifdef CONFIG_TR
2429         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2430
2431         if (priv->is_trdev)
2432                 src = tr_hdr->h_source;
2433         else
2434 #endif
2435                 src = hdr->h_source;
2436
2437         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2438         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2439                 if (vcc == entry->vcc) {
2440                         del_timer(&entry->timer);
2441                         memcpy(entry->mac_addr, src, ETH_ALEN);
2442                         entry->status = ESI_FORWARD_DIRECT;
2443                         entry->last_used = jiffies;
2444                         /* We might have got an entry */
2445                         if ((tmp = lec_arp_find(priv, src))) {
2446                                 lec_arp_remove(priv, tmp);
2447                                 lec_arp_put(tmp);
2448                         }
2449                         hlist_del(&entry->next);
2450                         lec_arp_add(priv, entry);
2451                         goto out;
2452                 }
2453         }
2454         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2455 out:
2456         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2457 }
2458
2459 MODULE_LICENSE("GPL");