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 <linux/if_bridge.h>
  38 #include "../bridge/br_private.h"
  39
  40 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  41 #endif
  42
  43 /* Modular too */
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46
  47 #include "lec.h"
  48 #include "lec_arpc.h"
  49 #include "resources.h"
  50
  51 #define DUMP_PACKETS 0          /*
  52                                  * 0 = None,
  53                                  * 1 = 30 first bytes
  54                                  * 2 = Whole packet
  55                                  */
  56
  57 #define LEC_UNRES_QUE_LEN 8     /*
  58                                  * number of tx packets to queue for a
  59                                  * single destination while waiting for SVC
  60                                  */
  61
  62 static int lec_open(struct net_device *dev);
  63 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
  64 static int lec_close(struct net_device *dev);
  65 static struct net_device_stats *lec_get_stats(struct net_device *dev);
  66 static void lec_init(struct net_device *dev);
  67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  68                                           unsigned char *mac_addr);
  69 static int lec_arp_remove(struct lec_priv *priv,
  70                           struct lec_arp_table *to_remove);
  71 /* LANE2 functions */
  72 static void lane2_associate_ind(struct net_device *dev, u8 *mac_address,
  73                                 u8 *tlvs, u32 sizeoftlvs);
  74 static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
  75                          u8 **tlvs, u32 *sizeoftlvs);
  76 static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
  77                                u8 *tlvs, u32 sizeoftlvs);
  78
  79 static int lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr,
  80                            unsigned long permanent);
  81 static void lec_arp_check_empties(struct lec_priv *priv,
  82                                   struct atm_vcc *vcc, struct sk_buff *skb);
  83 static void lec_arp_destroy(struct lec_priv *priv);
  84 static void lec_arp_init(struct lec_priv *priv);
  85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  86                                        unsigned char *mac_to_find,
  87                                        int is_rdesc,
  88                                        struct lec_arp_table **ret_entry);
  89 static void lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
  90                            unsigned char *atm_addr, unsigned long remoteflag,
  91                            unsigned int targetless_le_arp);
  92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  94 static void lec_set_flush_tran_id(struct lec_priv *priv,
  95                                   unsigned char *atm_addr,
  96                                   unsigned long tran_id);
  97 static void lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data,
  98                           struct atm_vcc *vcc,
  99                           void (*old_push) (struct atm_vcc *vcc,
 100                                             struct sk_buff *skb));
 101 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 102
 103 /* must be done under lec_arp_lock */
 104 static inline void lec_arp_hold(struct lec_arp_table *entry)
 105 {
 106         atomic_inc(&entry->usage);
 107 }
 108
 109 static inline void lec_arp_put(struct lec_arp_table *entry)
 110 {
 111         if (atomic_dec_and_test(&entry->usage))
 112                 kfree(entry);
 113 }
 114
 115
 116 static struct lane2_ops lane2_ops = {
 117         lane2_resolve,          /* resolve,             spec 3.1.3 */
 118         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 119         NULL                    /* associate indicator, spec 3.1.5 */
 120 };
 121
 122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 123
 124 /* Device structures */
 125 static struct net_device *dev_lec[MAX_LEC_ITF];
 126
 127 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         struct ethhdr *eth;
 131         char *buff;
 132         struct lec_priv *priv;
 133
 134         /*
 135          * Check if this is a BPDU. If so, ask zeppelin to send
 136          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 137          * as the Config BPDU has
 138          */
 139         eth = (struct ethhdr *)skb->data;
 140         buff = skb->data + skb->dev->hard_header_len;
 141         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 142                 struct sock *sk;
 143                 struct sk_buff *skb2;
 144                 struct atmlec_msg *mesg;
 145
 146                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 147                 if (skb2 == NULL)
 148                         return;
 149                 skb2->len = sizeof(struct atmlec_msg);
 150                 mesg = (struct atmlec_msg *)skb2->data;
 151                 mesg->type = l_topology_change;
 152                 buff += 4;
 153                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 154
 155                 priv = (struct lec_priv *)dev->priv;
 156                 atm_force_charge(priv->lecd, skb2->truesize);
 157                 sk = sk_atm(priv->lecd);
 158                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 159                 sk->sk_data_ready(sk, skb2->len);
 160         }
 161
 162         return;
 163 }
 164 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 165
 166 /*
 167  * Modelled after tr_type_trans
 168  * All multicast and ARE or STE frames go to BUS.
 169  * Non source routed frames go by destination address.
 170  * Last hop source routed frames go by destination address.
 171  * Not last hop source routed frames go by _next_ route descriptor.
 172  * Returns pointer to destination MAC address or fills in rdesc
 173  * and returns NULL.
 174  */
 175 #ifdef CONFIG_TR
 176 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 177 {
 178         struct trh_hdr *trh;
 179         unsigned int riflen, num_rdsc;
 180
 181         trh = (struct trh_hdr *)packet;
 182         if (trh->daddr[0] & (uint8_t) 0x80)
 183                 return bus_mac; /* multicast */
 184
 185         if (trh->saddr[0] & TR_RII) {
 186                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 187                 if ((ntohs(trh->rcf) >> 13) != 0)
 188                         return bus_mac; /* ARE or STE */
 189         } else
 190                 return trh->daddr;      /* not source routed */
 191
 192         if (riflen < 6)
 193                 return trh->daddr;      /* last hop, source routed */
 194
 195         /* riflen is 6 or more, packet has more than one route descriptor */
 196         num_rdsc = (riflen / 2) - 1;
 197         memset(rdesc, 0, ETH_ALEN);
 198         /* offset 4 comes from LAN destination field in LE control frames */
 199         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 200                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 201         else {
 202                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 203                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 204         }
 205
 206         return NULL;
 207 }
 208 #endif /* CONFIG_TR */
 209
 210 /*
 211  * Open/initialize the netdevice. This is called (in the current kernel)
 212  * sometime after booting when the 'ifconfig' program is run.
 213  *
 214  * This routine should set everything up anew at each open, even
 215  * registers that "should" only need to be set once at boot, so that
 216  * there is non-reboot way to recover if something goes wrong.
 217  */
 218
 219 static int lec_open(struct net_device *dev)
 220 {
 221         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 222
 223         netif_start_queue(dev);
 224         memset(&priv->stats, 0, sizeof(struct net_device_stats));
 225
 226         return 0;
 227 }
 228
 229 static __inline__ void
 230 lec_send(struct atm_vcc *vcc, struct sk_buff *skb, struct lec_priv *priv)
 231 {
 232         ATM_SKB(skb)->vcc = vcc;
 233         ATM_SKB(skb)->atm_options = vcc->atm_options;
 234
 235         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 236         if (vcc->send(vcc, skb) < 0) {
 237                 priv->stats.tx_dropped++;
 238                 return;
 239         }
 240
 241         priv->stats.tx_packets++;
 242         priv->stats.tx_bytes += skb->len;
 243 }
 244
 245 static void lec_tx_timeout(struct net_device *dev)
 246 {
 247         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 248         dev->trans_start = jiffies;
 249         netif_wake_queue(dev);
 250 }
 251
 252 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 253 {
 254         struct sk_buff *skb2;
 255         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 256         struct lecdatahdr_8023 *lec_h;
 257         struct atm_vcc *vcc;
 258         struct lec_arp_table *entry;
 259         unsigned char *dst;
 260         int min_frame_size;
 261 #ifdef CONFIG_TR
 262         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 263 #endif
 264         int is_rdesc;
 265 #if DUMP_PACKETS > 0
 266         char buf[300];
 267         int i = 0;
 268 #endif /* DUMP_PACKETS >0 */
 269
 270         pr_debug("lec_start_xmit called\n");
 271         if (!priv->lecd) {
 272                 printk("%s:No lecd attached\n", dev->name);
 273                 priv->stats.tx_errors++;
 274                 netif_stop_queue(dev);
 275                 return -EUNATCH;
 276         }
 277
 278         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 279                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 280                 (long)skb_end_pointer(skb));
 281 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 282         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 283                 lec_handle_bridge(skb, dev);
 284 #endif
 285
 286         /* Make sure we have room for lec_id */
 287         if (skb_headroom(skb) < 2) {
 288
 289                 pr_debug("lec_start_xmit: reallocating skb\n");
 290                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 291                 kfree_skb(skb);
 292                 if (skb2 == NULL)
 293                         return 0;
 294                 skb = skb2;
 295         }
 296         skb_push(skb, 2);
 297
 298         /* Put le header to place, works for TokenRing too */
 299         lec_h = (struct lecdatahdr_8023 *)skb->data;
 300         lec_h->le_header = htons(priv->lecid);
 301
 302 #ifdef CONFIG_TR
 303         /*
 304          * Ugly. Use this to realign Token Ring packets for
 305          * e.g. PCA-200E driver.
 306          */
 307         if (priv->is_trdev) {
 308                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 309                 kfree_skb(skb);
 310                 if (skb2 == NULL)
 311                         return 0;
 312                 skb = skb2;
 313         }
 314 #endif
 315
 316 #if DUMP_PACKETS > 0
 317         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 318                skb->len, priv->lecid);
 319 #if DUMP_PACKETS >= 2
 320         for (i = 0; i < skb->len && i < 99; i++) {
 321                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 322         }
 323 #elif DUMP_PACKETS >= 1
 324         for (i = 0; i < skb->len && i < 30; i++) {
 325                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 326         }
 327 #endif /* DUMP_PACKETS >= 1 */
 328         if (i == skb->len)
 329                 printk("%s\n", buf);
 330         else
 331                 printk("%s...\n", buf);
 332 #endif /* DUMP_PACKETS > 0 */
 333
 334         /* Minimum ethernet-frame size */
 335 #ifdef CONFIG_TR
 336         if (priv->is_trdev)
 337                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 338         else
 339 #endif
 340                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 341         if (skb->len < min_frame_size) {
 342                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 343                         skb2 = skb_copy_expand(skb, 0,
 344                                                min_frame_size - skb->truesize,
 345                                                GFP_ATOMIC);
 346                         dev_kfree_skb(skb);
 347                         if (skb2 == NULL) {
 348                                 priv->stats.tx_dropped++;
 349                                 return 0;
 350                         }
 351                         skb = skb2;
 352                 }
 353                 skb_put(skb, min_frame_size - skb->len);
 354         }
 355
 356         /* Send to right vcc */
 357         is_rdesc = 0;
 358         dst = lec_h->h_dest;
 359 #ifdef CONFIG_TR
 360         if (priv->is_trdev) {
 361                 dst = get_tr_dst(skb->data + 2, rdesc);
 362                 if (dst == NULL) {
 363                         dst = rdesc;
 364                         is_rdesc = 1;
 365                 }
 366         }
 367 #endif
 368         entry = NULL;
 369         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 370         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 371                 vcc, vcc ? vcc->flags : 0, entry);
 372         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 373                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 374                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 375                                 dev->name);
 376                         pr_debug("MAC address " MAC_FMT "\n",
 377                                  lec_h->h_dest[0], lec_h->h_dest[1],
 378                                  lec_h->h_dest[2], lec_h->h_dest[3],
 379                                  lec_h->h_dest[4], lec_h->h_dest[5]);
 380                         skb_queue_tail(&entry->tx_wait, skb);
 381                 } else {
 382                         pr_debug
 383                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 384                              dev->name);
 385                         pr_debug("MAC address " MAC_FMT "\n",
 386                                  lec_h->h_dest[0], lec_h->h_dest[1],
 387                                  lec_h->h_dest[2], lec_h->h_dest[3],
 388                                  lec_h->h_dest[4], lec_h->h_dest[5]);
 389                         priv->stats.tx_dropped++;
 390                         dev_kfree_skb(skb);
 391                 }
 392                 goto out;
 393         }
 394 #if DUMP_PACKETS > 0
 395         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 396 #endif /* DUMP_PACKETS > 0 */
 397
 398         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 399                 pr_debug("lec.c: emptying tx queue, ");
 400                 pr_debug("MAC address " MAC_FMT "\n",
 401                          lec_h->h_dest[0], lec_h->h_dest[1],
 402                          lec_h->h_dest[2], lec_h->h_dest[3],
 403                          lec_h->h_dest[4], lec_h->h_dest[5]);
 404                 lec_send(vcc, skb2, priv);
 405         }
 406
 407         lec_send(vcc, skb, priv);
 408
 409         if (!atm_may_send(vcc, 0)) {
 410                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 411
 412                 vpriv->xoff = 1;
 413                 netif_stop_queue(dev);
 414
 415                 /*
 416                  * vcc->pop() might have occurred in between, making
 417                  * the vcc usuable again.  Since xmit is serialized,
 418                  * this is the only situation we have to re-test.
 419                  */
 420
 421                 if (atm_may_send(vcc, 0))
 422                         netif_wake_queue(dev);
 423         }
 424
 425 out:
 426         if (entry)
 427                 lec_arp_put(entry);
 428         dev->trans_start = jiffies;
 429         return 0;
 430 }
 431
 432 /* The inverse routine to net_open(). */
 433 static int lec_close(struct net_device *dev)
 434 {
 435         netif_stop_queue(dev);
 436         return 0;
 437 }
 438
 439 /*
 440  * Get the current statistics.
 441  * This may be called with the card open or closed.
 442  */
 443 static struct net_device_stats *lec_get_stats(struct net_device *dev)
 444 {
 445         return &((struct lec_priv *)dev->priv)->stats;
 446 }
 447
 448 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 449 {
 450         unsigned long flags;
 451         struct net_device *dev = (struct net_device *)vcc->proto_data;
 452         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 453         struct atmlec_msg *mesg;
 454         struct lec_arp_table *entry;
 455         int i;
 456         char *tmp;              /* FIXME */
 457
 458         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 459         mesg = (struct atmlec_msg *)skb->data;
 460         tmp = skb->data;
 461         tmp += sizeof(struct atmlec_msg);
 462         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 463         switch (mesg->type) {
 464         case l_set_mac_addr:
 465                 for (i = 0; i < 6; i++) {
 466                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 467                 }
 468                 break;
 469         case l_del_mac_addr:
 470                 for (i = 0; i < 6; i++) {
 471                         dev->dev_addr[i] = 0;
 472                 }
 473                 break;
 474         case l_addr_delete:
 475                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 476                                 mesg->content.normal.flag);
 477                 break;
 478         case l_topology_change:
 479                 priv->topology_change = mesg->content.normal.flag;
 480                 break;
 481         case l_flush_complete:
 482                 lec_flush_complete(priv, mesg->content.normal.flag);
 483                 break;
 484         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 485                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 486                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 487                 lec_arp_remove(priv, entry);
 488                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 489
 490                 if (mesg->content.normal.no_source_le_narp)
 491                         break;
 492                 /* FALL THROUGH */
 493         case l_arp_update:
 494                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 495                                mesg->content.normal.atm_addr,
 496                                mesg->content.normal.flag,
 497                                mesg->content.normal.targetless_le_arp);
 498                 pr_debug("lec: in l_arp_update\n");
 499                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 500                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 501                                 mesg->sizeoftlvs);
 502                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 503                                             tmp, mesg->sizeoftlvs);
 504                 }
 505                 break;
 506         case l_config:
 507                 priv->maximum_unknown_frame_count =
 508                     mesg->content.config.maximum_unknown_frame_count;
 509                 priv->max_unknown_frame_time =
 510                     (mesg->content.config.max_unknown_frame_time * HZ);
 511                 priv->max_retry_count = mesg->content.config.max_retry_count;
 512                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 513                 priv->forward_delay_time =
 514                     (mesg->content.config.forward_delay_time * HZ);
 515                 priv->arp_response_time =
 516                     (mesg->content.config.arp_response_time * HZ);
 517                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 518                 priv->path_switching_delay =
 519                     (mesg->content.config.path_switching_delay * HZ);
 520                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 521                 priv->lane2_ops = NULL;
 522                 if (priv->lane_version > 1)
 523                         priv->lane2_ops = &lane2_ops;
 524                 if (dev->change_mtu(dev, mesg->content.config.mtu))
 525                         printk("%s: change_mtu to %d failed\n", dev->name,
 526                                mesg->content.config.mtu);
 527                 priv->is_proxy = mesg->content.config.is_proxy;
 528                 break;
 529         case l_flush_tran_id:
 530                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 531                                       mesg->content.normal.flag);
 532                 break;
 533         case l_set_lecid:
 534                 priv->lecid =
 535                     (unsigned short)(0xffff & mesg->content.normal.flag);
 536                 break;
 537         case l_should_bridge:
 538 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 539                 {
 540                         struct net_bridge_fdb_entry *f;
 541
 542                         pr_debug
 543                             ("%s: bridge zeppelin asks about " MAC_FMT "\n",
 544                              dev->name,
 545                              mesg->content.proxy.mac_addr[0],
 546                              mesg->content.proxy.mac_addr[1],
 547                              mesg->content.proxy.mac_addr[2],
 548                              mesg->content.proxy.mac_addr[3],
 549                              mesg->content.proxy.mac_addr[4],
 550                              mesg->content.proxy.mac_addr[5]);
 551
 552                         if (br_fdb_get_hook == NULL || dev->br_port == NULL)
 553                                 break;
 554
 555                         f = br_fdb_get_hook(dev->br_port->br,
 556                                             mesg->content.proxy.mac_addr);
 557                         if (f != NULL && f->dst->dev != dev
 558                             && f->dst->state == BR_STATE_FORWARDING) {
 559                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 560                                 struct sk_buff *skb2;
 561                                 struct sock *sk;
 562
 563                                 pr_debug
 564                                     ("%s: entry found, responding to zeppelin\n",
 565                                      dev->name);
 566                                 skb2 =
 567                                     alloc_skb(sizeof(struct atmlec_msg),
 568                                               GFP_ATOMIC);
 569                                 if (skb2 == NULL) {
 570                                         br_fdb_put_hook(f);
 571                                         break;
 572                                 }
 573                                 skb2->len = sizeof(struct atmlec_msg);
 574                                 skb_copy_to_linear_data(skb2, mesg,
 575                                                         sizeof(*mesg));
 576                                 atm_force_charge(priv->lecd, skb2->truesize);
 577                                 sk = sk_atm(priv->lecd);
 578                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 579                                 sk->sk_data_ready(sk, skb2->len);
 580                         }
 581                         if (f != NULL)
 582                                 br_fdb_put_hook(f);
 583                 }
 584 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 585                 break;
 586         default:
 587                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 588                 dev_kfree_skb(skb);
 589                 return -EINVAL;
 590         }
 591         dev_kfree_skb(skb);
 592         return 0;
 593 }
 594
 595 static void lec_atm_close(struct atm_vcc *vcc)
 596 {
 597         struct sk_buff *skb;
 598         struct net_device *dev = (struct net_device *)vcc->proto_data;
 599         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 600
 601         priv->lecd = NULL;
 602         /* Do something needful? */
 603
 604         netif_stop_queue(dev);
 605         lec_arp_destroy(priv);
 606
 607         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 608                 printk("%s lec_atm_close: closing with messages pending\n",
 609                        dev->name);
 610         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 611                 atm_return(vcc, skb->truesize);
 612                 dev_kfree_skb(skb);
 613         }
 614
 615         printk("%s: Shut down!\n", dev->name);
 616         module_put(THIS_MODULE);
 617 }
 618
 619 static struct atmdev_ops lecdev_ops = {
 620         .close = lec_atm_close,
 621         .send = lec_atm_send
 622 };
 623
 624 static struct atm_dev lecatm_dev = {
 625         .ops = &lecdev_ops,
 626         .type = "lec",
 627         .number = 999,          /* dummy device number */
 628         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 629 };
 630
 631 /*
 632  * LANE2: new argument struct sk_buff *data contains
 633  * the LE_ARP based TLVs introduced in the LANE2 spec
 634  */
 635 static int
 636 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 637              unsigned char *mac_addr, unsigned char *atm_addr,
 638              struct sk_buff *data)
 639 {
 640         struct sock *sk;
 641         struct sk_buff *skb;
 642         struct atmlec_msg *mesg;
 643
 644         if (!priv || !priv->lecd) {
 645                 return -1;
 646         }
 647         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 648         if (!skb)
 649                 return -1;
 650         skb->len = sizeof(struct atmlec_msg);
 651         mesg = (struct atmlec_msg *)skb->data;
 652         memset(mesg, 0, sizeof(struct atmlec_msg));
 653         mesg->type = type;
 654         if (data != NULL)
 655                 mesg->sizeoftlvs = data->len;
 656         if (mac_addr)
 657                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 658         else
 659                 mesg->content.normal.targetless_le_arp = 1;
 660         if (atm_addr)
 661                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 662
 663         atm_force_charge(priv->lecd, skb->truesize);
 664         sk = sk_atm(priv->lecd);
 665         skb_queue_tail(&sk->sk_receive_queue, skb);
 666         sk->sk_data_ready(sk, skb->len);
 667
 668         if (data != NULL) {
 669                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 670                 atm_force_charge(priv->lecd, data->truesize);
 671                 skb_queue_tail(&sk->sk_receive_queue, data);
 672                 sk->sk_data_ready(sk, skb->len);
 673         }
 674
 675         return 0;
 676 }
 677
 678 /* shamelessly stolen from drivers/net/net_init.c */
 679 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 680 {
 681         if ((new_mtu < 68) || (new_mtu > 18190))
 682                 return -EINVAL;
 683         dev->mtu = new_mtu;
 684         return 0;
 685 }
 686
 687 static void lec_set_multicast_list(struct net_device *dev)
 688 {
 689         /*
 690          * by default, all multicast frames arrive over the bus.
 691          * eventually support selective multicast service
 692          */
 693         return;
 694 }
 695
 696 static void lec_init(struct net_device *dev)
 697 {
 698         dev->change_mtu = lec_change_mtu;
 699         dev->open = lec_open;
 700         dev->stop = lec_close;
 701         dev->hard_start_xmit = lec_start_xmit;
 702         dev->tx_timeout = lec_tx_timeout;
 703
 704         dev->get_stats = lec_get_stats;
 705         dev->set_multicast_list = lec_set_multicast_list;
 706         dev->do_ioctl = NULL;
 707         printk("%s: Initialized!\n", dev->name);
 708         return;
 709 }
 710
 711 static unsigned char lec_ctrl_magic[] = {
 712         0xff,
 713         0x00,
 714         0x01,
 715         0x01
 716 };
 717
 718 #define LEC_DATA_DIRECT_8023  2
 719 #define LEC_DATA_DIRECT_8025  3
 720
 721 static int lec_is_data_direct(struct atm_vcc *vcc)
 722 {
 723         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 724                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 725 }
 726
 727 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 728 {
 729         unsigned long flags;
 730         struct net_device *dev = (struct net_device *)vcc->proto_data;
 731         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 732
 733 #if DUMP_PACKETS >0
 734         int i = 0;
 735         char buf[300];
 736
 737         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 738                vcc->vpi, vcc->vci);
 739 #endif
 740         if (!skb) {
 741                 pr_debug("%s: null skb\n", dev->name);
 742                 lec_vcc_close(priv, vcc);
 743                 return;
 744         }
 745 #if DUMP_PACKETS > 0
 746         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 747                skb->len, priv->lecid);
 748 #if DUMP_PACKETS >= 2
 749         for (i = 0; i < skb->len && i < 99; i++) {
 750                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 751         }
 752 #elif DUMP_PACKETS >= 1
 753         for (i = 0; i < skb->len && i < 30; i++) {
 754                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 755         }
 756 #endif /* DUMP_PACKETS >= 1 */
 757         if (i == skb->len)
 758                 printk("%s\n", buf);
 759         else
 760                 printk("%s...\n", buf);
 761 #endif /* DUMP_PACKETS > 0 */
 762         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 763                 struct sock *sk = sk_atm(vcc);
 764
 765                 pr_debug("%s: To daemon\n", dev->name);
 766                 skb_queue_tail(&sk->sk_receive_queue, skb);
 767                 sk->sk_data_ready(sk, skb->len);
 768         } else {                /* Data frame, queue to protocol handlers */
 769                 struct lec_arp_table *entry;
 770                 unsigned char *src, *dst;
 771
 772                 atm_return(vcc, skb->truesize);
 773                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 774                     !priv->lecd || !(dev->flags & IFF_UP)) {
 775                         /*
 776                          * Probably looping back, or if lecd is missing,
 777                          * lecd has gone down
 778                          */
 779                         pr_debug("Ignoring frame...\n");
 780                         dev_kfree_skb(skb);
 781                         return;
 782                 }
 783 #ifdef CONFIG_TR
 784                 if (priv->is_trdev)
 785                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 786                 else
 787 #endif
 788                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 789
 790                 /*
 791                  * If this is a Data Direct VCC, and the VCC does not match
 792                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 793                  */
 794                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 795                 if (lec_is_data_direct(vcc)) {
 796 #ifdef CONFIG_TR
 797                         if (priv->is_trdev)
 798                                 src =
 799                                     ((struct lecdatahdr_8025 *)skb->data)->
 800                                     h_source;
 801                         else
 802 #endif
 803                                 src =
 804                                     ((struct lecdatahdr_8023 *)skb->data)->
 805                                     h_source;
 806                         entry = lec_arp_find(priv, src);
 807                         if (entry && entry->vcc != vcc) {
 808                                 lec_arp_remove(priv, entry);
 809                                 lec_arp_put(entry);
 810                         }
 811                 }
 812                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 813
 814                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 815                     !priv->is_proxy &&  /* Proxy wants all the packets */
 816                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 817                         dev_kfree_skb(skb);
 818                         return;
 819                 }
 820                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 821                         lec_arp_check_empties(priv, vcc, skb);
 822                 }
 823                 skb_pull(skb, 2);       /* skip lec_id */
 824 #ifdef CONFIG_TR
 825                 if (priv->is_trdev)
 826                         skb->protocol = tr_type_trans(skb, dev);
 827                 else
 828 #endif
 829                         skb->protocol = eth_type_trans(skb, dev);
 830                 priv->stats.rx_packets++;
 831                 priv->stats.rx_bytes += skb->len;
 832                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 833                 netif_rx(skb);
 834         }
 835 }
 836
 837 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 838 {
 839         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 840         struct net_device *dev = skb->dev;
 841
 842         if (vpriv == NULL) {
 843                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 844                 return;
 845         }
 846
 847         vpriv->old_pop(vcc, skb);
 848
 849         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 850                 vpriv->xoff = 0;
 851                 if (netif_running(dev) && netif_queue_stopped(dev))
 852                         netif_wake_queue(dev);
 853         }
 854 }
 855
 856 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 857 {
 858         struct lec_vcc_priv *vpriv;
 859         int bytes_left;
 860         struct atmlec_ioc ioc_data;
 861
 862         /* Lecd must be up in this case */
 863         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 864         if (bytes_left != 0) {
 865                 printk
 866                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 867                      bytes_left);
 868         }
 869         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 870             !dev_lec[ioc_data.dev_num])
 871                 return -EINVAL;
 872         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 873                 return -ENOMEM;
 874         vpriv->xoff = 0;
 875         vpriv->old_pop = vcc->pop;
 876         vcc->user_back = vpriv;
 877         vcc->pop = lec_pop;
 878         lec_vcc_added(dev_lec[ioc_data.dev_num]->priv,
 879                       &ioc_data, vcc, vcc->push);
 880         vcc->proto_data = dev_lec[ioc_data.dev_num];
 881         vcc->push = lec_push;
 882         return 0;
 883 }
 884
 885 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 886 {
 887         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 888                 return -EINVAL;
 889         vcc->proto_data = dev_lec[arg];
 890         return (lec_mcast_make((struct lec_priv *)dev_lec[arg]->priv, vcc));
 891 }
 892
 893 /* Initialize device. */
 894 static int lecd_attach(struct atm_vcc *vcc, int arg)
 895 {
 896         int i;
 897         struct lec_priv *priv;
 898
 899         if (arg < 0)
 900                 i = 0;
 901         else
 902                 i = arg;
 903 #ifdef CONFIG_TR
 904         if (arg >= MAX_LEC_ITF)
 905                 return -EINVAL;
 906 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 907         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 908                 return -EINVAL;
 909 #endif
 910         if (!dev_lec[i]) {
 911                 int is_trdev, size;
 912
 913                 is_trdev = 0;
 914                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 915                         is_trdev = 1;
 916
 917                 size = sizeof(struct lec_priv);
 918 #ifdef CONFIG_TR
 919                 if (is_trdev)
 920                         dev_lec[i] = alloc_trdev(size);
 921                 else
 922 #endif
 923                         dev_lec[i] = alloc_etherdev(size);
 924                 if (!dev_lec[i])
 925                         return -ENOMEM;
 926                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 927                 if (register_netdev(dev_lec[i])) {
 928                         free_netdev(dev_lec[i]);
 929                         return -EINVAL;
 930                 }
 931
 932                 priv = dev_lec[i]->priv;
 933                 priv->is_trdev = is_trdev;
 934                 lec_init(dev_lec[i]);
 935         } else {
 936                 priv = dev_lec[i]->priv;
 937                 if (priv->lecd)
 938                         return -EADDRINUSE;
 939         }
 940         lec_arp_init(priv);
 941         priv->itfnum = i;       /* LANE2 addition */
 942         priv->lecd = vcc;
 943         vcc->dev = &lecatm_dev;
 944         vcc_insert_socket(sk_atm(vcc));
 945
 946         vcc->proto_data = dev_lec[i];
 947         set_bit(ATM_VF_META, &vcc->flags);
 948         set_bit(ATM_VF_READY, &vcc->flags);
 949
 950         /* Set default values to these variables */
 951         priv->maximum_unknown_frame_count = 1;
 952         priv->max_unknown_frame_time = (1 * HZ);
 953         priv->vcc_timeout_period = (1200 * HZ);
 954         priv->max_retry_count = 1;
 955         priv->aging_time = (300 * HZ);
 956         priv->forward_delay_time = (15 * HZ);
 957         priv->topology_change = 0;
 958         priv->arp_response_time = (1 * HZ);
 959         priv->flush_timeout = (4 * HZ);
 960         priv->path_switching_delay = (6 * HZ);
 961
 962         if (dev_lec[i]->flags & IFF_UP) {
 963                 netif_start_queue(dev_lec[i]);
 964         }
 965         __module_get(THIS_MODULE);
 966         return i;
 967 }
 968
 969 #ifdef CONFIG_PROC_FS
 970 static char *lec_arp_get_status_string(unsigned char status)
 971 {
 972         static char *lec_arp_status_string[] = {
 973                 "ESI_UNKNOWN       ",
 974                 "ESI_ARP_PENDING   ",
 975                 "ESI_VC_PENDING    ",
 976                 "<Undefined>       ",
 977                 "ESI_FLUSH_PENDING ",
 978                 "ESI_FORWARD_DIRECT"
 979         };
 980
 981         if (status > ESI_FORWARD_DIRECT)
 982                 status = 3;     /* ESI_UNDEFINED */
 983         return lec_arp_status_string[status];
 984 }
 985
 986 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 987 {
 988         int i;
 989
 990         for (i = 0; i < ETH_ALEN; i++)
 991                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 992         seq_printf(seq, " ");
 993         for (i = 0; i < ATM_ESA_LEN; i++)
 994                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 995         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 996                    entry->flags & 0xffff);
 997         if (entry->vcc)
 998                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 999         else
1000                 seq_printf(seq, "        ");
1001         if (entry->recv_vcc) {
1002                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
1003                            entry->recv_vcc->vci);
1004         }
1005         seq_putc(seq, '\n');
1006 }
1007
1008 struct lec_state {
1009         unsigned long flags;
1010         struct lec_priv *locked;
1011         struct hlist_node *node;
1012         struct net_device *dev;
1013         int itf;
1014         int arp_table;
1015         int misc_table;
1016 };
1017
1018 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
1019                           loff_t *l)
1020 {
1021         struct hlist_node *e = state->node;
1022         struct lec_arp_table *tmp;
1023
1024         if (!e)
1025                 e = tbl->first;
1026         if (e == (void *)1) {
1027                 e = tbl->first;
1028                 --*l;
1029         }
1030
1031         hlist_for_each_entry_from(tmp, e, next) {
1032                 if (--*l < 0)
1033                         break;
1034         }
1035         state->node = e;
1036
1037         return (*l < 0) ? state : NULL;
1038 }
1039
1040 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1041                           struct lec_priv *priv)
1042 {
1043         void *v = NULL;
1044         int p;
1045
1046         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1047                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1048                 if (v)
1049                         break;
1050         }
1051         state->arp_table = p;
1052         return v;
1053 }
1054
1055 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1056                            struct lec_priv *priv)
1057 {
1058         struct hlist_head *lec_misc_tables[] = {
1059                 &priv->lec_arp_empty_ones,
1060                 &priv->lec_no_forward,
1061                 &priv->mcast_fwds
1062         };
1063         void *v = NULL;
1064         int q;
1065
1066         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1067                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1068                 if (v)
1069                         break;
1070         }
1071         state->misc_table = q;
1072         return v;
1073 }
1074
1075 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1076                            struct lec_priv *priv)
1077 {
1078         if (!state->locked) {
1079                 state->locked = priv;
1080                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1081         }
1082         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1083                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1084                 state->locked = NULL;
1085                 /* Partial state reset for the next time we get called */
1086                 state->arp_table = state->misc_table = 0;
1087         }
1088         return state->locked;
1089 }
1090
1091 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1092 {
1093         struct net_device *dev;
1094         void *v;
1095
1096         dev = state->dev ? state->dev : dev_lec[state->itf];
1097         v = (dev && dev->priv) ? lec_priv_walk(state, l, dev->priv) : NULL;
1098         if (!v && dev) {
1099                 dev_put(dev);
1100                 /* Partial state reset for the next time we get called */
1101                 dev = NULL;
1102         }
1103         state->dev = dev;
1104         return v;
1105 }
1106
1107 static void *lec_get_idx(struct lec_state *state, loff_t l)
1108 {
1109         void *v = NULL;
1110
1111         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1112                 v = lec_itf_walk(state, &l);
1113                 if (v)
1114                         break;
1115         }
1116         return v;
1117 }
1118
1119 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1120 {
1121         struct lec_state *state = seq->private;
1122
1123         state->itf = 0;
1124         state->dev = NULL;
1125         state->locked = NULL;
1126         state->arp_table = 0;
1127         state->misc_table = 0;
1128         state->node = (void *)1;
1129
1130         return *pos ? lec_get_idx(state, *pos) : (void *)1;
1131 }
1132
1133 static void lec_seq_stop(struct seq_file *seq, void *v)
1134 {
1135         struct lec_state *state = seq->private;
1136
1137         if (state->dev) {
1138                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1139                                        state->flags);
1140                 dev_put(state->dev);
1141         }
1142 }
1143
1144 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1145 {
1146         struct lec_state *state = seq->private;
1147
1148         v = lec_get_idx(state, 1);
1149         *pos += !!PTR_ERR(v);
1150         return v;
1151 }
1152
1153 static int lec_seq_show(struct seq_file *seq, void *v)
1154 {
1155         static char lec_banner[] = "Itf  MAC          ATM destination"
1156             "                          Status            Flags "
1157             "VPI/VCI Recv VPI/VCI\n";
1158
1159         if (v == (void *)1)
1160                 seq_puts(seq, lec_banner);
1161         else {
1162                 struct lec_state *state = seq->private;
1163                 struct net_device *dev = state->dev;
1164                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1165
1166                 seq_printf(seq, "%s ", dev->name);
1167                 lec_info(seq, entry);
1168         }
1169         return 0;
1170 }
1171
1172 static const struct seq_operations lec_seq_ops = {
1173         .start = lec_seq_start,
1174         .next = lec_seq_next,
1175         .stop = lec_seq_stop,
1176         .show = lec_seq_show,
1177 };
1178
1179 static int lec_seq_open(struct inode *inode, struct file *file)
1180 {
1181         struct lec_state *state;
1182         struct seq_file *seq;
1183         int rc = -EAGAIN;
1184
1185         state = kmalloc(sizeof(*state), GFP_KERNEL);
1186         if (!state) {
1187                 rc = -ENOMEM;
1188                 goto out;
1189         }
1190
1191         rc = seq_open(file, &lec_seq_ops);
1192         if (rc)
1193                 goto out_kfree;
1194         seq = file->private_data;
1195         seq->private = state;
1196 out:
1197         return rc;
1198
1199 out_kfree:
1200         kfree(state);
1201         goto out;
1202 }
1203
1204 static int lec_seq_release(struct inode *inode, struct file *file)
1205 {
1206         return seq_release_private(inode, file);
1207 }
1208
1209 static const struct file_operations lec_seq_fops = {
1210         .owner = THIS_MODULE,
1211         .open = lec_seq_open,
1212         .read = seq_read,
1213         .llseek = seq_lseek,
1214         .release = lec_seq_release,
1215 };
1216 #endif
1217
1218 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1219 {
1220         struct atm_vcc *vcc = ATM_SD(sock);
1221         int err = 0;
1222
1223         switch (cmd) {
1224         case ATMLEC_CTRL:
1225         case ATMLEC_MCAST:
1226         case ATMLEC_DATA:
1227                 if (!capable(CAP_NET_ADMIN))
1228                         return -EPERM;
1229                 break;
1230         default:
1231                 return -ENOIOCTLCMD;
1232         }
1233
1234         switch (cmd) {
1235         case ATMLEC_CTRL:
1236                 err = lecd_attach(vcc, (int)arg);
1237                 if (err >= 0)
1238                         sock->state = SS_CONNECTED;
1239                 break;
1240         case ATMLEC_MCAST:
1241                 err = lec_mcast_attach(vcc, (int)arg);
1242                 break;
1243         case ATMLEC_DATA:
1244                 err = lec_vcc_attach(vcc, (void __user *)arg);
1245                 break;
1246         }
1247
1248         return err;
1249 }
1250
1251 static struct atm_ioctl lane_ioctl_ops = {
1252         .owner = THIS_MODULE,
1253         .ioctl = lane_ioctl,
1254 };
1255
1256 static int __init lane_module_init(void)
1257 {
1258 #ifdef CONFIG_PROC_FS
1259         struct proc_dir_entry *p;
1260
1261         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1262         if (!p) {
1263                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1264                 return -ENOMEM;
1265         }
1266 #endif
1267
1268         register_atm_ioctl(&lane_ioctl_ops);
1269         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1270         return 0;
1271 }
1272
1273 static void __exit lane_module_cleanup(void)
1274 {
1275         int i;
1276         struct lec_priv *priv;
1277
1278         remove_proc_entry("lec", atm_proc_root);
1279
1280         deregister_atm_ioctl(&lane_ioctl_ops);
1281
1282         for (i = 0; i < MAX_LEC_ITF; i++) {
1283                 if (dev_lec[i] != NULL) {
1284                         priv = (struct lec_priv *)dev_lec[i]->priv;
1285                         unregister_netdev(dev_lec[i]);
1286                         free_netdev(dev_lec[i]);
1287                         dev_lec[i] = NULL;
1288                 }
1289         }
1290
1291         return;
1292 }
1293
1294 module_init(lane_module_init);
1295 module_exit(lane_module_cleanup);
1296
1297 /*
1298  * LANE2: 3.1.3, LE_RESOLVE.request
1299  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1300  * If sizeoftlvs == NULL the default TLVs associated with with this
1301  * lec will be used.
1302  * If dst_mac == NULL, targetless LE_ARP will be sent
1303  */
1304 static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
1305                          u8 **tlvs, u32 *sizeoftlvs)
1306 {
1307         unsigned long flags;
1308         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1309         struct lec_arp_table *table;
1310         struct sk_buff *skb;
1311         int retval;
1312
1313         if (force == 0) {
1314                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1315                 table = lec_arp_find(priv, dst_mac);
1316                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1317                 if (table == NULL)
1318                         return -1;
1319
1320                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1321                 if (*tlvs == NULL)
1322                         return -1;
1323
1324                 *sizeoftlvs = table->sizeoftlvs;
1325
1326                 return 0;
1327         }
1328
1329         if (sizeoftlvs == NULL)
1330                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1331
1332         else {
1333                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1334                 if (skb == NULL)
1335                         return -1;
1336                 skb->len = *sizeoftlvs;
1337                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1338                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1339         }
1340         return retval;
1341 }
1342
1343 /*
1344  * LANE2: 3.1.4, LE_ASSOCIATE.request
1345  * Associate the *tlvs with the *lan_dst address.
1346  * Will overwrite any previous association
1347  * Returns 1 for success, 0 for failure (out of memory)
1348  *
1349  */
1350 static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
1351                                u8 *tlvs, u32 sizeoftlvs)
1352 {
1353         int retval;
1354         struct sk_buff *skb;
1355         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1356
1357         if (compare_ether_addr(lan_dst, dev->dev_addr))
1358                 return (0);     /* not our mac address */
1359
1360         kfree(priv->tlvs);      /* NULL if there was no previous association */
1361
1362         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1363         if (priv->tlvs == NULL)
1364                 return (0);
1365         priv->sizeoftlvs = sizeoftlvs;
1366
1367         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1368         if (skb == NULL)
1369                 return 0;
1370         skb->len = sizeoftlvs;
1371         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1372         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1373         if (retval != 0)
1374                 printk("lec.c: lane2_associate_req() failed\n");
1375         /*
1376          * If the previous association has changed we must
1377          * somehow notify other LANE entities about the change
1378          */
1379         return (1);
1380 }
1381
1382 /*
1383  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1384  *
1385  */
1386 static void lane2_associate_ind(struct net_device *dev, u8 *mac_addr,
1387                                 u8 *tlvs, u32 sizeoftlvs)
1388 {
1389 #if 0
1390         int i = 0;
1391 #endif
1392         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1393 #if 0                           /*
1394                                  * Why have the TLVs in LE_ARP entries
1395                                  * since we do not use them? When you
1396                                  * uncomment this code, make sure the
1397                                  * TLVs get freed when entry is killed
1398                                  */
1399         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1400
1401         if (entry == NULL)
1402                 return;         /* should not happen */
1403
1404         kfree(entry->tlvs);
1405
1406         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1407         if (entry->tlvs == NULL)
1408                 return;
1409         entry->sizeoftlvs = sizeoftlvs;
1410 #endif
1411 #if 0
1412         printk("lec.c: lane2_associate_ind()\n");
1413         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1414         while (i < sizeoftlvs)
1415                 printk("%02x ", tlvs[i++]);
1416
1417         printk("\n");
1418 #endif
1419
1420         /* tell MPOA about the TLVs we saw */
1421         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1422                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1423                                                      tlvs, sizeoftlvs);
1424         }
1425         return;
1426 }
1427
1428 /*
1429  * Here starts what used to lec_arpc.c
1430  *
1431  * lec_arpc.c was added here when making
1432  * lane client modular. October 1997
1433  */
1434
1435 #include <linux/types.h>
1436 #include <linux/timer.h>
1437 #include <asm/param.h>
1438 #include <asm/atomic.h>
1439 #include <linux/inetdevice.h>
1440 #include <net/route.h>
1441
1442 #if 0
1443 #define pr_debug(format,args...)
1444 /*
1445 #define pr_debug printk
1446 */
1447 #endif
1448 #define DEBUG_ARP_TABLE 0
1449
1450 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1451
1452 static void lec_arp_check_expire(struct work_struct *work);
1453 static void lec_arp_expire_arp(unsigned long data);
1454
1455 /*
1456  * Arp table funcs
1457  */
1458
1459 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1460
1461 /*
1462  * Initialization of arp-cache
1463  */
1464 static void lec_arp_init(struct lec_priv *priv)
1465 {
1466         unsigned short i;
1467
1468         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1469                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1470         }
1471         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1472         INIT_HLIST_HEAD(&priv->lec_no_forward);
1473         INIT_HLIST_HEAD(&priv->mcast_fwds);
1474         spin_lock_init(&priv->lec_arp_lock);
1475         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1476         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1477 }
1478
1479 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1480 {
1481         if (entry->vcc) {
1482                 struct atm_vcc *vcc = entry->vcc;
1483                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1484                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1485
1486                 vcc->pop = vpriv->old_pop;
1487                 if (vpriv->xoff)
1488                         netif_wake_queue(dev);
1489                 kfree(vpriv);
1490                 vcc->user_back = NULL;
1491                 vcc->push = entry->old_push;
1492                 vcc_release_async(vcc, -EPIPE);
1493                 entry->vcc = NULL;
1494         }
1495         if (entry->recv_vcc) {
1496                 entry->recv_vcc->push = entry->old_recv_push;
1497                 vcc_release_async(entry->recv_vcc, -EPIPE);
1498                 entry->recv_vcc = NULL;
1499         }
1500 }
1501
1502 /*
1503  * Insert entry to lec_arp_table
1504  * LANE2: Add to the end of the list to satisfy 8.1.13
1505  */
1506 static inline void
1507 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1508 {
1509         struct hlist_head *tmp;
1510
1511         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1512         hlist_add_head(&entry->next, tmp);
1513
1514         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1515                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1516                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1517                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1518 }
1519
1520 /*
1521  * Remove entry from lec_arp_table
1522  */
1523 static int
1524 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1525 {
1526         struct hlist_node *node;
1527         struct lec_arp_table *entry;
1528         int i, remove_vcc = 1;
1529
1530         if (!to_remove) {
1531                 return -1;
1532         }
1533
1534         hlist_del(&to_remove->next);
1535         del_timer(&to_remove->timer);
1536
1537         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1538         if (to_remove->status >= ESI_FLUSH_PENDING) {
1539                 /*
1540                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1541                  */
1542                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1543                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1544                                 if (memcmp(to_remove->atm_addr,
1545                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1546                                         remove_vcc = 0;
1547                                         break;
1548                                 }
1549                         }
1550                 }
1551                 if (remove_vcc)
1552                         lec_arp_clear_vccs(to_remove);
1553         }
1554         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1555
1556         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1557                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1558                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1559                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1560         return 0;
1561 }
1562
1563 #if DEBUG_ARP_TABLE
1564 static char *get_status_string(unsigned char st)
1565 {
1566         switch (st) {
1567         case ESI_UNKNOWN:
1568                 return "ESI_UNKNOWN";
1569         case ESI_ARP_PENDING:
1570                 return "ESI_ARP_PENDING";
1571         case ESI_VC_PENDING:
1572                 return "ESI_VC_PENDING";
1573         case ESI_FLUSH_PENDING:
1574                 return "ESI_FLUSH_PENDING";
1575         case ESI_FORWARD_DIRECT:
1576                 return "ESI_FORWARD_DIRECT";
1577         default:
1578                 return "<UNKNOWN>";
1579         }
1580 }
1581
1582 static void dump_arp_table(struct lec_priv *priv)
1583 {
1584         struct hlist_node *node;
1585         struct lec_arp_table *rulla;
1586         char buf[256];
1587         int i, j, offset;
1588
1589         printk("Dump %p:\n", priv);
1590         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1591                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1592                         offset = 0;
1593                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1594                         offset += sprintf(buf + offset, "Mac:");
1595                         for (j = 0; j < ETH_ALEN; j++) {
1596                                 offset += sprintf(buf + offset,
1597                                                   "%2.2x ",
1598                                                   rulla->mac_addr[j] & 0xff);
1599                         }
1600                         offset += sprintf(buf + offset, "Atm:");
1601                         for (j = 0; j < ATM_ESA_LEN; j++) {
1602                                 offset += sprintf(buf + offset,
1603                                                   "%2.2x ",
1604                                                   rulla->atm_addr[j] & 0xff);
1605                         }
1606                         offset += sprintf(buf + offset,
1607                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1608                                           rulla->vcc ? rulla->vcc->vpi : 0,
1609                                           rulla->vcc ? rulla->vcc->vci : 0,
1610                                           rulla->recv_vcc ? rulla->recv_vcc->
1611                                           vpi : 0,
1612                                           rulla->recv_vcc ? rulla->recv_vcc->
1613                                           vci : 0, rulla->last_used,
1614                                           rulla->timestamp, rulla->no_tries);
1615                         offset +=
1616                             sprintf(buf + offset,
1617                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1618                                     rulla->flags, rulla->packets_flooded,
1619                                     get_status_string(rulla->status));
1620                         printk("%s\n", buf);
1621                 }
1622         }
1623
1624         if (!hlist_empty(&priv->lec_no_forward))
1625                 printk("No forward\n");
1626         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1627                 offset = 0;
1628                 offset += sprintf(buf + offset, "Mac:");
1629                 for (j = 0; j < ETH_ALEN; j++) {
1630                         offset += sprintf(buf + offset, "%2.2x ",
1631                                           rulla->mac_addr[j] & 0xff);
1632                 }
1633                 offset += sprintf(buf + offset, "Atm:");
1634                 for (j = 0; j < ATM_ESA_LEN; j++) {
1635                         offset += sprintf(buf + offset, "%2.2x ",
1636                                           rulla->atm_addr[j] & 0xff);
1637                 }
1638                 offset += sprintf(buf + offset,
1639                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1640                                   rulla->vcc ? rulla->vcc->vpi : 0,
1641                                   rulla->vcc ? rulla->vcc->vci : 0,
1642                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1643                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1644                                   rulla->last_used,
1645                                   rulla->timestamp, rulla->no_tries);
1646                 offset += sprintf(buf + offset,
1647                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1648                                   rulla->flags, rulla->packets_flooded,
1649                                   get_status_string(rulla->status));
1650                 printk("%s\n", buf);
1651         }
1652
1653         if (!hlist_empty(&priv->lec_arp_empty_ones))
1654                 printk("Empty ones\n");
1655         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1656                 offset = 0;
1657                 offset += sprintf(buf + offset, "Mac:");
1658                 for (j = 0; j < ETH_ALEN; j++) {
1659                         offset += sprintf(buf + offset, "%2.2x ",
1660                                           rulla->mac_addr[j] & 0xff);
1661                 }
1662                 offset += sprintf(buf + offset, "Atm:");
1663                 for (j = 0; j < ATM_ESA_LEN; j++) {
1664                         offset += sprintf(buf + offset, "%2.2x ",
1665                                           rulla->atm_addr[j] & 0xff);
1666                 }
1667                 offset += sprintf(buf + offset,
1668                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1669                                   rulla->vcc ? rulla->vcc->vpi : 0,
1670                                   rulla->vcc ? rulla->vcc->vci : 0,
1671                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1672                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1673                                   rulla->last_used,
1674                                   rulla->timestamp, rulla->no_tries);
1675                 offset += sprintf(buf + offset,
1676                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1677                                   rulla->flags, rulla->packets_flooded,
1678                                   get_status_string(rulla->status));
1679                 printk("%s", buf);
1680         }
1681
1682         if (!hlist_empty(&priv->mcast_fwds))
1683                 printk("Multicast Forward VCCs\n");
1684         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1685                 offset = 0;
1686                 offset += sprintf(buf + offset, "Mac:");
1687                 for (j = 0; j < ETH_ALEN; j++) {
1688                         offset += sprintf(buf + offset, "%2.2x ",
1689                                           rulla->mac_addr[j] & 0xff);
1690                 }
1691                 offset += sprintf(buf + offset, "Atm:");
1692                 for (j = 0; j < ATM_ESA_LEN; j++) {
1693                         offset += sprintf(buf + offset, "%2.2x ",
1694                                           rulla->atm_addr[j] & 0xff);
1695                 }
1696                 offset += sprintf(buf + offset,
1697                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1698                                   rulla->vcc ? rulla->vcc->vpi : 0,
1699                                   rulla->vcc ? rulla->vcc->vci : 0,
1700                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1701                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1702                                   rulla->last_used,
1703                                   rulla->timestamp, rulla->no_tries);
1704                 offset += sprintf(buf + offset,
1705                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1706                                   rulla->flags, rulla->packets_flooded,
1707                                   get_status_string(rulla->status));
1708                 printk("%s\n", buf);
1709         }
1710
1711 }
1712 #else
1713 #define dump_arp_table(priv) do { } while (0)
1714 #endif
1715
1716 /*
1717  * Destruction of arp-cache
1718  */
1719 static void lec_arp_destroy(struct lec_priv *priv)
1720 {
1721         unsigned long flags;
1722         struct hlist_node *node, *next;
1723         struct lec_arp_table *entry;
1724         int i;
1725
1726         cancel_rearming_delayed_work(&priv->lec_arp_work);
1727
1728         /*
1729          * Remove all entries
1730          */
1731
1732         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1733         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1734                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1735                         lec_arp_remove(priv, entry);
1736                         lec_arp_put(entry);
1737                 }
1738                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1739         }
1740
1741         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1742                 del_timer_sync(&entry->timer);
1743                 lec_arp_clear_vccs(entry);
1744                 hlist_del(&entry->next);
1745                 lec_arp_put(entry);
1746         }
1747         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1748
1749         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1750                 del_timer_sync(&entry->timer);
1751                 lec_arp_clear_vccs(entry);
1752                 hlist_del(&entry->next);
1753                 lec_arp_put(entry);
1754         }
1755         INIT_HLIST_HEAD(&priv->lec_no_forward);
1756
1757         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1758                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1759                 lec_arp_clear_vccs(entry);
1760                 hlist_del(&entry->next);
1761                 lec_arp_put(entry);
1762         }
1763         INIT_HLIST_HEAD(&priv->mcast_fwds);
1764         priv->mcast_vcc = NULL;
1765         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1766 }
1767
1768 /*
1769  * Find entry by mac_address
1770  */
1771 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1772                                           unsigned char *mac_addr)
1773 {
1774         struct hlist_node *node;
1775         struct hlist_head *head;
1776         struct lec_arp_table *entry;
1777
1778         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1779                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1780                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1781
1782         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1783         hlist_for_each_entry(entry, node, head, next) {
1784                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1785                         return entry;
1786                 }
1787         }
1788         return NULL;
1789 }
1790
1791 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1792                                         unsigned char *mac_addr)
1793 {
1794         struct lec_arp_table *to_return;
1795
1796         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1797         if (!to_return) {
1798                 printk("LEC: Arp entry kmalloc failed\n");
1799                 return NULL;
1800         }
1801         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1802         INIT_HLIST_NODE(&to_return->next);
1803         setup_timer(&to_return->timer, lec_arp_expire_arp,
1804                         (unsigned long)to_return);
1805         to_return->last_used = jiffies;
1806         to_return->priv = priv;
1807         skb_queue_head_init(&to_return->tx_wait);
1808         atomic_set(&to_return->usage, 1);
1809         return to_return;
1810 }
1811
1812 /* Arp sent timer expired */
1813 static void lec_arp_expire_arp(unsigned long data)
1814 {
1815         struct lec_arp_table *entry;
1816
1817         entry = (struct lec_arp_table *)data;
1818
1819         pr_debug("lec_arp_expire_arp\n");
1820         if (entry->status == ESI_ARP_PENDING) {
1821                 if (entry->no_tries <= entry->priv->max_retry_count) {
1822                         if (entry->is_rdesc)
1823                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1824                                              entry->mac_addr, NULL, NULL);
1825                         else
1826                                 send_to_lecd(entry->priv, l_arp_xmt,
1827                                              entry->mac_addr, NULL, NULL);
1828                         entry->no_tries++;
1829                 }
1830                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1831         }
1832 }
1833
1834 /* Unknown/unused vcc expire, remove associated entry */
1835 static void lec_arp_expire_vcc(unsigned long data)
1836 {
1837         unsigned long flags;
1838         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1839         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1840
1841         del_timer(&to_remove->timer);
1842
1843         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1844                 to_remove, priv,
1845                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1846                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1847
1848         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1849         hlist_del(&to_remove->next);
1850         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1851
1852         lec_arp_clear_vccs(to_remove);
1853         lec_arp_put(to_remove);
1854 }
1855
1856 /*
1857  * Expire entries.
1858  * 1. Re-set timer
1859  * 2. For each entry, delete entries that have aged past the age limit.
1860  * 3. For each entry, depending on the status of the entry, perform
1861  *    the following maintenance.
1862  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1863  *       tick_count is above the max_unknown_frame_time, clear
1864  *       the tick_count to zero and clear the packets_flooded counter
1865  *       to zero. This supports the packet rate limit per address
1866  *       while flooding unknowns.
1867  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1868  *       than or equal to the path_switching_delay, change the status
1869  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1870  *       regardless of the progress of the flush protocol.
1871  */
1872 static void lec_arp_check_expire(struct work_struct *work)
1873 {
1874         unsigned long flags;
1875         struct lec_priv *priv =
1876                 container_of(work, struct lec_priv, lec_arp_work.work);
1877         struct hlist_node *node, *next;
1878         struct lec_arp_table *entry;
1879         unsigned long now;
1880         unsigned long time_to_check;
1881         int i;
1882
1883         pr_debug("lec_arp_check_expire %p\n", priv);
1884         now = jiffies;
1885 restart:
1886         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1887         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1888                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1889                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1890                             priv->topology_change)
1891                                 time_to_check = priv->forward_delay_time;
1892                         else
1893                                 time_to_check = priv->aging_time;
1894
1895                         pr_debug("About to expire: %lx - %lx > %lx\n",
1896                                 now, entry->last_used, time_to_check);
1897                         if (time_after(now, entry->last_used + time_to_check)
1898                             && !(entry->flags & LEC_PERMANENT_FLAG)
1899                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1900                                 /* Remove entry */
1901                                 pr_debug("LEC:Entry timed out\n");
1902                                 lec_arp_remove(priv, entry);
1903                                 lec_arp_put(entry);
1904                         } else {
1905                                 /* Something else */
1906                                 if ((entry->status == ESI_VC_PENDING ||
1907                                      entry->status == ESI_ARP_PENDING)
1908                                     && time_after_eq(now,
1909                                                      entry->timestamp +
1910                                                      priv->
1911                                                      max_unknown_frame_time)) {
1912                                         entry->timestamp = jiffies;
1913                                         entry->packets_flooded = 0;
1914                                         if (entry->status == ESI_VC_PENDING)
1915                                                 send_to_lecd(priv, l_svc_setup,
1916                                                              entry->mac_addr,
1917                                                              entry->atm_addr,
1918                                                              NULL);
1919                                 }
1920                                 if (entry->status == ESI_FLUSH_PENDING
1921                                     &&
1922                                     time_after_eq(now, entry->timestamp +
1923                                                   priv->path_switching_delay)) {
1924                                         struct sk_buff *skb;
1925                                         struct atm_vcc *vcc = entry->vcc;
1926
1927                                         lec_arp_hold(entry);
1928                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1929                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1930                                                 lec_send(vcc, skb, entry->priv);
1931                                         entry->last_used = jiffies;
1932                                         entry->status = ESI_FORWARD_DIRECT;
1933                                         lec_arp_put(entry);
1934                                         goto restart;
1935                                 }
1936                         }
1937                 }
1938         }
1939         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1940
1941         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1942 }
1943
1944 /*
1945  * Try to find vcc where mac_address is attached.
1946  *
1947  */
1948 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1949                                        unsigned char *mac_to_find, int is_rdesc,
1950                                        struct lec_arp_table **ret_entry)
1951 {
1952         unsigned long flags;
1953         struct lec_arp_table *entry;
1954         struct atm_vcc *found;
1955
1956         if (mac_to_find[0] & 0x01) {
1957                 switch (priv->lane_version) {
1958                 case 1:
1959                         return priv->mcast_vcc;
1960                         break;
1961                 case 2: /* LANE2 wants arp for multicast addresses */
1962                         if (!compare_ether_addr(mac_to_find, bus_mac))
1963                                 return priv->mcast_vcc;
1964                         break;
1965                 default:
1966                         break;
1967                 }
1968         }
1969
1970         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1971         entry = lec_arp_find(priv, mac_to_find);
1972
1973         if (entry) {
1974                 if (entry->status == ESI_FORWARD_DIRECT) {
1975                         /* Connection Ok */
1976                         entry->last_used = jiffies;
1977                         lec_arp_hold(entry);
1978                         *ret_entry = entry;
1979                         found = entry->vcc;
1980                         goto out;
1981                 }
1982                 /*
1983                  * If the LE_ARP cache entry is still pending, reset count to 0
1984                  * so another LE_ARP request can be made for this frame.
1985                  */
1986                 if (entry->status == ESI_ARP_PENDING) {
1987                         entry->no_tries = 0;
1988                 }
1989                 /*
1990                  * Data direct VC not yet set up, check to see if the unknown
1991                  * frame count is greater than the limit. If the limit has
1992                  * not been reached, allow the caller to send packet to
1993                  * BUS.
1994                  */
1995                 if (entry->status != ESI_FLUSH_PENDING &&
1996                     entry->packets_flooded <
1997                     priv->maximum_unknown_frame_count) {
1998                         entry->packets_flooded++;
1999                         pr_debug("LEC_ARP: Flooding..\n");
2000                         found = priv->mcast_vcc;
2001                         goto out;
2002                 }
2003                 /*
2004                  * We got here because entry->status == ESI_FLUSH_PENDING
2005                  * or BUS flood limit was reached for an entry which is
2006                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
2007                  */
2008                 lec_arp_hold(entry);
2009                 *ret_entry = entry;
2010                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
2011                         entry->vcc);
2012                 found = NULL;
2013         } else {
2014                 /* No matching entry was found */
2015                 entry = make_entry(priv, mac_to_find);
2016                 pr_debug("LEC_ARP: Making entry\n");
2017                 if (!entry) {
2018                         found = priv->mcast_vcc;
2019                         goto out;
2020                 }
2021                 lec_arp_add(priv, entry);
2022                 /* We want arp-request(s) to be sent */
2023                 entry->packets_flooded = 1;
2024                 entry->status = ESI_ARP_PENDING;
2025                 entry->no_tries = 1;
2026                 entry->last_used = entry->timestamp = jiffies;
2027                 entry->is_rdesc = is_rdesc;
2028                 if (entry->is_rdesc)
2029                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
2030                                      NULL);
2031                 else
2032                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
2033                 entry->timer.expires = jiffies + (1 * HZ);
2034                 entry->timer.function = lec_arp_expire_arp;
2035                 add_timer(&entry->timer);
2036                 found = priv->mcast_vcc;
2037         }
2038
2039 out:
2040         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2041         return found;
2042 }
2043
2044 static int
2045 lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr,
2046                 unsigned long permanent)
2047 {
2048         unsigned long flags;
2049         struct hlist_node *node, *next;
2050         struct lec_arp_table *entry;
2051         int i;
2052
2053         pr_debug("lec_addr_delete\n");
2054         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2055         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2056                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2057                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2058                             && (permanent ||
2059                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2060                                 lec_arp_remove(priv, entry);
2061                                 lec_arp_put(entry);
2062                         }
2063                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2064                         return 0;
2065                 }
2066         }
2067         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2068         return -1;
2069 }
2070
2071 /*
2072  * Notifies:  Response to arp_request (atm_addr != NULL)
2073  */
2074 static void
2075 lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
2076                unsigned char *atm_addr, unsigned long remoteflag,
2077                unsigned int targetless_le_arp)
2078 {
2079         unsigned long flags;
2080         struct hlist_node *node, *next;
2081         struct lec_arp_table *entry, *tmp;
2082         int i;
2083
2084         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2085         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2086                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2087                 mac_addr[4], mac_addr[5]);
2088
2089         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2090         entry = lec_arp_find(priv, mac_addr);
2091         if (entry == NULL && targetless_le_arp)
2092                 goto out;       /*
2093                                  * LANE2: ignore targetless LE_ARPs for which
2094                                  * we have no entry in the cache. 7.1.30
2095                                  */
2096         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2097                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2098                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2099                                 hlist_del(&entry->next);
2100                                 del_timer(&entry->timer);
2101                                 tmp = lec_arp_find(priv, mac_addr);
2102                                 if (tmp) {
2103                                         del_timer(&tmp->timer);
2104                                         tmp->status = ESI_FORWARD_DIRECT;
2105                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2106                                         tmp->vcc = entry->vcc;
2107                                         tmp->old_push = entry->old_push;
2108                                         tmp->last_used = jiffies;
2109                                         del_timer(&entry->timer);
2110                                         lec_arp_put(entry);
2111                                         entry = tmp;
2112                                 } else {
2113                                         entry->status = ESI_FORWARD_DIRECT;
2114                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2115                                         entry->last_used = jiffies;
2116                                         lec_arp_add(priv, entry);
2117                                 }
2118                                 if (remoteflag)
2119                                         entry->flags |= LEC_REMOTE_FLAG;
2120                                 else
2121                                         entry->flags &= ~LEC_REMOTE_FLAG;
2122                                 pr_debug("After update\n");
2123                                 dump_arp_table(priv);
2124                                 goto out;
2125                         }
2126                 }
2127         }
2128
2129         entry = lec_arp_find(priv, mac_addr);
2130         if (!entry) {
2131                 entry = make_entry(priv, mac_addr);
2132                 if (!entry)
2133                         goto out;
2134                 entry->status = ESI_UNKNOWN;
2135                 lec_arp_add(priv, entry);
2136                 /* Temporary, changes before end of function */
2137         }
2138         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2139         del_timer(&entry->timer);
2140         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2141                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2142                         if (entry != tmp &&
2143                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2144                                 /* Vcc to this host exists */
2145                                 if (tmp->status > ESI_VC_PENDING) {
2146                                         /*
2147                                          * ESI_FLUSH_PENDING,
2148                                          * ESI_FORWARD_DIRECT
2149                                          */
2150                                         entry->vcc = tmp->vcc;
2151                                         entry->old_push = tmp->old_push;
2152                                 }
2153                                 entry->status = tmp->status;
2154                                 break;
2155                         }
2156                 }
2157         }
2158         if (remoteflag)
2159                 entry->flags |= LEC_REMOTE_FLAG;
2160         else
2161                 entry->flags &= ~LEC_REMOTE_FLAG;
2162         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2163                 entry->status = ESI_VC_PENDING;
2164                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2165         }
2166         pr_debug("After update2\n");
2167         dump_arp_table(priv);
2168 out:
2169         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2170 }
2171
2172 /*
2173  * Notifies: Vcc setup ready
2174  */
2175 static void
2176 lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data,
2177               struct atm_vcc *vcc,
2178               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2179 {
2180         unsigned long flags;
2181         struct hlist_node *node;
2182         struct lec_arp_table *entry;
2183         int i, found_entry = 0;
2184
2185         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2186         if (ioc_data->receive == 2) {
2187                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2188
2189                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2190 #if 0
2191                 entry = lec_arp_find(priv, bus_mac);
2192                 if (!entry) {
2193                         printk("LEC_ARP: Multicast entry not found!\n");
2194                         goto out;
2195                 }
2196                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2197                 entry->recv_vcc = vcc;
2198                 entry->old_recv_push = old_push;
2199 #endif
2200                 entry = make_entry(priv, bus_mac);
2201                 if (entry == NULL)
2202                         goto out;
2203                 del_timer(&entry->timer);
2204                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2205                 entry->recv_vcc = vcc;
2206                 entry->old_recv_push = old_push;
2207                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2208                 goto out;
2209         } else if (ioc_data->receive == 1) {
2210                 /*
2211                  * Vcc which we don't want to make default vcc,
2212                  * attach it anyway.
2213                  */
2214                 pr_debug
2215                     ("LEC_ARP:Attaching data direct, not default: "
2216                      "%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",
2217                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2218                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2219                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2220                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2221                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2222                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2223                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2224                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2225                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2226                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2227                 entry = make_entry(priv, bus_mac);
2228                 if (entry == NULL)
2229                         goto out;
2230                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2231                 memset(entry->mac_addr, 0, ETH_ALEN);
2232                 entry->recv_vcc = vcc;
2233                 entry->old_recv_push = old_push;
2234                 entry->status = ESI_UNKNOWN;
2235                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2236                 entry->timer.function = lec_arp_expire_vcc;
2237                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2238                 add_timer(&entry->timer);
2239                 dump_arp_table(priv);
2240                 goto out;
2241         }
2242         pr_debug
2243             ("LEC_ARP:Attaching data direct, default: "
2244              "%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",
2245              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2246              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2247              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2248              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2249              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2250              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2251              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2252              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2253              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2254              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2255         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2256                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2257                         if (memcmp
2258                             (ioc_data->atm_addr, entry->atm_addr,
2259                              ATM_ESA_LEN) == 0) {
2260                                 pr_debug("LEC_ARP: Attaching data direct\n");
2261                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2262                                         entry->vcc ? entry->vcc->vci : 0,
2263                                         entry->recv_vcc ? entry->recv_vcc->
2264                                         vci : 0);
2265                                 found_entry = 1;
2266                                 del_timer(&entry->timer);
2267                                 entry->vcc = vcc;
2268                                 entry->old_push = old_push;
2269                                 if (entry->status == ESI_VC_PENDING) {
2270                                         if (priv->maximum_unknown_frame_count
2271                                             == 0)
2272                                                 entry->status =
2273                                                     ESI_FORWARD_DIRECT;
2274                                         else {
2275                                                 entry->timestamp = jiffies;
2276                                                 entry->status =
2277                                                     ESI_FLUSH_PENDING;
2278 #if 0
2279                                                 send_to_lecd(priv, l_flush_xmt,
2280                                                              NULL,
2281                                                              entry->atm_addr,
2282                                                              NULL);
2283 #endif
2284                                         }
2285                                 } else {
2286                                         /*
2287                                          * They were forming a connection
2288                                          * to us, and we to them. Our
2289                                          * ATM address is numerically lower
2290                                          * than theirs, so we make connection
2291                                          * we formed into default VCC (8.1.11).
2292                                          * Connection they made gets torn
2293                                          * down. This might confuse some
2294                                          * clients. Can be changed if
2295                                          * someone reports trouble...
2296                                          */
2297                                         ;
2298                                 }
2299                         }
2300                 }
2301         }
2302         if (found_entry) {
2303                 pr_debug("After vcc was added\n");
2304                 dump_arp_table(priv);
2305                 goto out;
2306         }
2307         /*
2308          * Not found, snatch address from first data packet that arrives
2309          * from this vcc
2310          */
2311         entry = make_entry(priv, bus_mac);
2312         if (!entry)
2313                 goto out;
2314         entry->vcc = vcc;
2315         entry->old_push = old_push;
2316         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2317         memset(entry->mac_addr, 0, ETH_ALEN);
2318         entry->status = ESI_UNKNOWN;
2319         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2320         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2321         entry->timer.function = lec_arp_expire_vcc;
2322         add_timer(&entry->timer);
2323         pr_debug("After vcc was added\n");
2324         dump_arp_table(priv);
2325 out:
2326         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2327 }
2328
2329 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2330 {
2331         unsigned long flags;
2332         struct hlist_node *node;
2333         struct lec_arp_table *entry;
2334         int i;
2335
2336         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2337 restart:
2338         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2339         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2340                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2341                         if (entry->flush_tran_id == tran_id
2342                             && entry->status == ESI_FLUSH_PENDING) {
2343                                 struct sk_buff *skb;
2344                                 struct atm_vcc *vcc = entry->vcc;
2345
2346                                 lec_arp_hold(entry);
2347                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2348                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2349                                         lec_send(vcc, skb, entry->priv);
2350                                 entry->last_used = jiffies;
2351                                 entry->status = ESI_FORWARD_DIRECT;
2352                                 lec_arp_put(entry);
2353                                 pr_debug("LEC_ARP: Flushed\n");
2354                                 goto restart;
2355                         }
2356                 }
2357         }
2358         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2359         dump_arp_table(priv);
2360 }
2361
2362 static void
2363 lec_set_flush_tran_id(struct lec_priv *priv,
2364                       unsigned char *atm_addr, unsigned long tran_id)
2365 {
2366         unsigned long flags;
2367         struct hlist_node *node;
2368         struct lec_arp_table *entry;
2369         int i;
2370
2371         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2372         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2373                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2374                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2375                                 entry->flush_tran_id = tran_id;
2376                                 pr_debug("Set flush transaction id to %lx for %p\n",
2377                                         tran_id, entry);
2378                         }
2379                 }
2380         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2381 }
2382
2383 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2384 {
2385         unsigned long flags;
2386         unsigned char mac_addr[] = {
2387                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2388         };
2389         struct lec_arp_table *to_add;
2390         struct lec_vcc_priv *vpriv;
2391         int err = 0;
2392
2393         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2394                 return -ENOMEM;
2395         vpriv->xoff = 0;
2396         vpriv->old_pop = vcc->pop;
2397         vcc->user_back = vpriv;
2398         vcc->pop = lec_pop;
2399         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2400         to_add = make_entry(priv, mac_addr);
2401         if (!to_add) {
2402                 vcc->pop = vpriv->old_pop;
2403                 kfree(vpriv);
2404                 err = -ENOMEM;
2405                 goto out;
2406         }
2407         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2408         to_add->status = ESI_FORWARD_DIRECT;
2409         to_add->flags |= LEC_PERMANENT_FLAG;
2410         to_add->vcc = vcc;
2411         to_add->old_push = vcc->push;
2412         vcc->push = lec_push;
2413         priv->mcast_vcc = vcc;
2414         lec_arp_add(priv, to_add);
2415 out:
2416         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2417         return err;
2418 }
2419
2420 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2421 {
2422         unsigned long flags;
2423         struct hlist_node *node, *next;
2424         struct lec_arp_table *entry;
2425         int i;
2426
2427         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2428         dump_arp_table(priv);
2429
2430         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2431
2432         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2433                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2434                         if (vcc == entry->vcc) {
2435                                 lec_arp_remove(priv, entry);
2436                                 lec_arp_put(entry);
2437                                 if (priv->mcast_vcc == vcc) {
2438                                         priv->mcast_vcc = NULL;
2439                                 }
2440                         }
2441                 }
2442         }
2443
2444         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2445                 if (entry->vcc == vcc) {
2446                         lec_arp_clear_vccs(entry);
2447                         del_timer(&entry->timer);
2448                         hlist_del(&entry->next);
2449                         lec_arp_put(entry);
2450                 }
2451         }
2452
2453         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2454                 if (entry->recv_vcc == vcc) {
2455                         lec_arp_clear_vccs(entry);
2456                         del_timer(&entry->timer);
2457                         hlist_del(&entry->next);
2458                         lec_arp_put(entry);
2459                 }
2460         }
2461
2462         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2463                 if (entry->recv_vcc == vcc) {
2464                         lec_arp_clear_vccs(entry);
2465                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2466                         hlist_del(&entry->next);
2467                         lec_arp_put(entry);
2468                 }
2469         }
2470
2471         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2472         dump_arp_table(priv);
2473 }
2474
2475 static void
2476 lec_arp_check_empties(struct lec_priv *priv,
2477                       struct atm_vcc *vcc, struct sk_buff *skb)
2478 {
2479         unsigned long flags;
2480         struct hlist_node *node, *next;
2481         struct lec_arp_table *entry, *tmp;
2482         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2483         unsigned char *src;
2484 #ifdef CONFIG_TR
2485         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2486
2487         if (priv->is_trdev)
2488                 src = tr_hdr->h_source;
2489         else
2490 #endif
2491                 src = hdr->h_source;
2492
2493         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2494         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2495                 if (vcc == entry->vcc) {
2496                         del_timer(&entry->timer);
2497                         memcpy(entry->mac_addr, src, ETH_ALEN);
2498                         entry->status = ESI_FORWARD_DIRECT;
2499                         entry->last_used = jiffies;
2500                         /* We might have got an entry */
2501                         if ((tmp = lec_arp_find(priv, src))) {
2502                                 lec_arp_remove(priv, tmp);
2503                                 lec_arp_put(tmp);
2504                         }
2505                         hlist_del(&entry->next);
2506                         lec_arp_add(priv, entry);
2507                         goto out;
2508                 }
2509         }
2510         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2511 out:
2512         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2513 }
2514
2515 MODULE_LICENSE("GPL");