net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/bitops.h>
   9 #include <linux/capability.h>
  10
  11 /* We are ethernet device */
  12 #include <linux/if_ether.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <net/sock.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/ip.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/uaccess.h>
  20 #include <net/arp.h>
  21 #include <net/dst.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/seq_file.h>
  25
  26 /* TokenRing if needed */
  27 #ifdef CONFIG_TR
  28 #include <linux/trdevice.h>
  29 #endif
  30
  31 /* And atm device */
  32 #include <linux/atmdev.h>
  33 #include <linux/atmlec.h>
  34
  35 /* Proxy LEC knows about bridging */
  36 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  37 #include "../bridge/br_private.h"
  38
  39 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  40 #endif
  41
  42 /* Modular too */
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45
  46 #include "lec.h"
  47 #include "lec_arpc.h"
  48 #include "resources.h"
  49
  50 #define DUMP_PACKETS 0          /*
  51                                  * 0 = None,
  52                                  * 1 = 30 first bytes
  53                                  * 2 = Whole packet
  54                                  */
  55
  56 #define LEC_UNRES_QUE_LEN 8     /*
  57                                  * number of tx packets to queue for a
  58                                  * single destination while waiting for SVC
  59                                  */
  60
  61 static int lec_open(struct net_device *dev);
  62 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
  63 static int lec_close(struct net_device *dev);
  64 static void lec_init(struct net_device *dev);
  65 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  66                                           const unsigned char *mac_addr);
  67 static int lec_arp_remove(struct lec_priv *priv,
  68                           struct lec_arp_table *to_remove);
  69 /* LANE2 functions */
  70 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  71                                 const u8 *tlvs, u32 sizeoftlvs);
  72 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  73                          u8 **tlvs, u32 *sizeoftlvs);
  74 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  75                                const u8 *tlvs, u32 sizeoftlvs);
  76
  77 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  78                            unsigned long permanent);
  79 static void lec_arp_check_empties(struct lec_priv *priv,
  80                                   struct atm_vcc *vcc, struct sk_buff *skb);
  81 static void lec_arp_destroy(struct lec_priv *priv);
  82 static void lec_arp_init(struct lec_priv *priv);
  83 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  84                                        const unsigned char *mac_to_find,
  85                                        int is_rdesc,
  86                                        struct lec_arp_table **ret_entry);
  87 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  88                            const unsigned char *atm_addr, unsigned long remoteflag,
  89                            unsigned int targetless_le_arp);
  90 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  91 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  92 static void lec_set_flush_tran_id(struct lec_priv *priv,
  93                                   const unsigned char *atm_addr,
  94                                   unsigned long tran_id);
  95 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
  96                           struct atm_vcc *vcc,
  97                           void (*old_push) (struct atm_vcc *vcc,
  98                                             struct sk_buff *skb));
  99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 100
 101 /* must be done under lec_arp_lock */
 102 static inline void lec_arp_hold(struct lec_arp_table *entry)
 103 {
 104         atomic_inc(&entry->usage);
 105 }
 106
 107 static inline void lec_arp_put(struct lec_arp_table *entry)
 108 {
 109         if (atomic_dec_and_test(&entry->usage))
 110                 kfree(entry);
 111 }
 112
 113
 114 static struct lane2_ops lane2_ops = {
 115         lane2_resolve,          /* resolve,             spec 3.1.3 */
 116         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 117         NULL                    /* associate indicator, spec 3.1.5 */
 118 };
 119
 120 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 121
 122 /* Device structures */
 123 static struct net_device *dev_lec[MAX_LEC_ITF];
 124
 125 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 126 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 127 {
 128         struct ethhdr *eth;
 129         char *buff;
 130         struct lec_priv *priv;
 131
 132         /*
 133          * Check if this is a BPDU. If so, ask zeppelin to send
 134          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 135          * as the Config BPDU has
 136          */
 137         eth = (struct ethhdr *)skb->data;
 138         buff = skb->data + skb->dev->hard_header_len;
 139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 140                 struct sock *sk;
 141                 struct sk_buff *skb2;
 142                 struct atmlec_msg *mesg;
 143
 144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 145                 if (skb2 == NULL)
 146                         return;
 147                 skb2->len = sizeof(struct atmlec_msg);
 148                 mesg = (struct atmlec_msg *)skb2->data;
 149                 mesg->type = l_topology_change;
 150                 buff += 4;
 151                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 152
 153                 priv = netdev_priv(dev);
 154                 atm_force_charge(priv->lecd, skb2->truesize);
 155                 sk = sk_atm(priv->lecd);
 156                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 157                 sk->sk_data_ready(sk, skb2->len);
 158         }
 159
 160         return;
 161 }
 162 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 163
 164 /*
 165  * Modelled after tr_type_trans
 166  * All multicast and ARE or STE frames go to BUS.
 167  * Non source routed frames go by destination address.
 168  * Last hop source routed frames go by destination address.
 169  * Not last hop source routed frames go by _next_ route descriptor.
 170  * Returns pointer to destination MAC address or fills in rdesc
 171  * and returns NULL.
 172  */
 173 #ifdef CONFIG_TR
 174 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 175 {
 176         struct trh_hdr *trh;
 177         unsigned int riflen, num_rdsc;
 178
 179         trh = (struct trh_hdr *)packet;
 180         if (trh->daddr[0] & (uint8_t) 0x80)
 181                 return bus_mac; /* multicast */
 182
 183         if (trh->saddr[0] & TR_RII) {
 184                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 185                 if ((ntohs(trh->rcf) >> 13) != 0)
 186                         return bus_mac; /* ARE or STE */
 187         } else
 188                 return trh->daddr;      /* not source routed */
 189
 190         if (riflen < 6)
 191                 return trh->daddr;      /* last hop, source routed */
 192
 193         /* riflen is 6 or more, packet has more than one route descriptor */
 194         num_rdsc = (riflen / 2) - 1;
 195         memset(rdesc, 0, ETH_ALEN);
 196         /* offset 4 comes from LAN destination field in LE control frames */
 197         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 198                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 199         else {
 200                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 201                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 202         }
 203
 204         return NULL;
 205 }
 206 #endif /* CONFIG_TR */
 207
 208 /*
 209  * Open/initialize the netdevice. This is called (in the current kernel)
 210  * sometime after booting when the 'ifconfig' program is run.
 211  *
 212  * This routine should set everything up anew at each open, even
 213  * registers that "should" only need to be set once at boot, so that
 214  * there is non-reboot way to recover if something goes wrong.
 215  */
 216
 217 static int lec_open(struct net_device *dev)
 218 {
 219         netif_start_queue(dev);
 220         memset(&dev->stats, 0, sizeof(struct net_device_stats));
 221
 222         return 0;
 223 }
 224
 225 static void
 226 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 227 {
 228         struct net_device *dev = skb->dev;
 229
 230         ATM_SKB(skb)->vcc = vcc;
 231         ATM_SKB(skb)->atm_options = vcc->atm_options;
 232
 233         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 234         if (vcc->send(vcc, skb) < 0) {
 235                 dev->stats.tx_dropped++;
 236                 return;
 237         }
 238
 239         dev->stats.tx_packets++;
 240         dev->stats.tx_bytes += skb->len;
 241 }
 242
 243 static void lec_tx_timeout(struct net_device *dev)
 244 {
 245         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 246         dev->trans_start = jiffies;
 247         netif_wake_queue(dev);
 248 }
 249
 250 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 251 {
 252         struct sk_buff *skb2;
 253         struct lec_priv *priv = netdev_priv(dev);
 254         struct lecdatahdr_8023 *lec_h;
 255         struct atm_vcc *vcc;
 256         struct lec_arp_table *entry;
 257         unsigned char *dst;
 258         int min_frame_size;
 259 #ifdef CONFIG_TR
 260         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 261 #endif
 262         int is_rdesc;
 263 #if DUMP_PACKETS > 0
 264         char buf[300];
 265         int i = 0;
 266 #endif /* DUMP_PACKETS >0 */
 267
 268         pr_debug("lec_start_xmit called\n");
 269         if (!priv->lecd) {
 270                 printk("%s:No lecd attached\n", dev->name);
 271                 dev->stats.tx_errors++;
 272                 netif_stop_queue(dev);
 273                 kfree_skb(skb);
 274                 return NETDEV_TX_OK;
 275         }
 276
 277         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 278                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 279                 (long)skb_end_pointer(skb));
 280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 281         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 282                 lec_handle_bridge(skb, dev);
 283 #endif
 284
 285         /* Make sure we have room for lec_id */
 286         if (skb_headroom(skb) < 2) {
 287
 288                 pr_debug("lec_start_xmit: reallocating skb\n");
 289                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 290                 kfree_skb(skb);
 291                 if (skb2 == NULL)
 292                         return 0;
 293                 skb = skb2;
 294         }
 295         skb_push(skb, 2);
 296
 297         /* Put le header to place, works for TokenRing too */
 298         lec_h = (struct lecdatahdr_8023 *)skb->data;
 299         lec_h->le_header = htons(priv->lecid);
 300
 301 #ifdef CONFIG_TR
 302         /*
 303          * Ugly. Use this to realign Token Ring packets for
 304          * e.g. PCA-200E driver.
 305          */
 306         if (priv->is_trdev) {
 307                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 308                 kfree_skb(skb);
 309                 if (skb2 == NULL)
 310                         return 0;
 311                 skb = skb2;
 312         }
 313 #endif
 314
 315 #if DUMP_PACKETS > 0
 316         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 317                skb->len, priv->lecid);
 318 #if DUMP_PACKETS >= 2
 319         for (i = 0; i < skb->len && i < 99; i++) {
 320                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 321         }
 322 #elif DUMP_PACKETS >= 1
 323         for (i = 0; i < skb->len && i < 30; i++) {
 324                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 325         }
 326 #endif /* DUMP_PACKETS >= 1 */
 327         if (i == skb->len)
 328                 printk("%s\n", buf);
 329         else
 330                 printk("%s...\n", buf);
 331 #endif /* DUMP_PACKETS > 0 */
 332
 333         /* Minimum ethernet-frame size */
 334 #ifdef CONFIG_TR
 335         if (priv->is_trdev)
 336                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 337         else
 338 #endif
 339                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 340         if (skb->len < min_frame_size) {
 341                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 342                         skb2 = skb_copy_expand(skb, 0,
 343                                                min_frame_size - skb->truesize,
 344                                                GFP_ATOMIC);
 345                         dev_kfree_skb(skb);
 346                         if (skb2 == NULL) {
 347                                 dev->stats.tx_dropped++;
 348                                 return 0;
 349                         }
 350                         skb = skb2;
 351                 }
 352                 skb_put(skb, min_frame_size - skb->len);
 353         }
 354
 355         /* Send to right vcc */
 356         is_rdesc = 0;
 357         dst = lec_h->h_dest;
 358 #ifdef CONFIG_TR
 359         if (priv->is_trdev) {
 360                 dst = get_tr_dst(skb->data + 2, rdesc);
 361                 if (dst == NULL) {
 362                         dst = rdesc;
 363                         is_rdesc = 1;
 364                 }
 365         }
 366 #endif
 367         entry = NULL;
 368         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 369         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 370                 vcc, vcc ? vcc->flags : 0, entry);
 371         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 372                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 373                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 374                                 dev->name);
 375                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 376                         skb_queue_tail(&entry->tx_wait, skb);
 377                 } else {
 378                         pr_debug
 379                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 380                              dev->name);
 381                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 382                         dev->stats.tx_dropped++;
 383                         dev_kfree_skb(skb);
 384                 }
 385                 goto out;
 386         }
 387 #if DUMP_PACKETS > 0
 388         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 389 #endif /* DUMP_PACKETS > 0 */
 390
 391         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 392                 pr_debug("lec.c: emptying tx queue, ");
 393                 pr_debug("MAC address %pM\n", lec_h->h_dest);
 394                 lec_send(vcc, skb2);
 395         }
 396
 397         lec_send(vcc, skb);
 398
 399         if (!atm_may_send(vcc, 0)) {
 400                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 401
 402                 vpriv->xoff = 1;
 403                 netif_stop_queue(dev);
 404
 405                 /*
 406                  * vcc->pop() might have occurred in between, making
 407                  * the vcc usuable again.  Since xmit is serialized,
 408                  * this is the only situation we have to re-test.
 409                  */
 410
 411                 if (atm_may_send(vcc, 0))
 412                         netif_wake_queue(dev);
 413         }
 414
 415 out:
 416         if (entry)
 417                 lec_arp_put(entry);
 418         dev->trans_start = jiffies;
 419         return 0;
 420 }
 421
 422 /* The inverse routine to net_open(). */
 423 static int lec_close(struct net_device *dev)
 424 {
 425         netif_stop_queue(dev);
 426         return 0;
 427 }
 428
 429 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 430 {
 431         unsigned long flags;
 432         struct net_device *dev = (struct net_device *)vcc->proto_data;
 433         struct lec_priv *priv = netdev_priv(dev);
 434         struct atmlec_msg *mesg;
 435         struct lec_arp_table *entry;
 436         int i;
 437         char *tmp;              /* FIXME */
 438
 439         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 440         mesg = (struct atmlec_msg *)skb->data;
 441         tmp = skb->data;
 442         tmp += sizeof(struct atmlec_msg);
 443         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 444         switch (mesg->type) {
 445         case l_set_mac_addr:
 446                 for (i = 0; i < 6; i++) {
 447                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 448                 }
 449                 break;
 450         case l_del_mac_addr:
 451                 for (i = 0; i < 6; i++) {
 452                         dev->dev_addr[i] = 0;
 453                 }
 454                 break;
 455         case l_addr_delete:
 456                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 457                                 mesg->content.normal.flag);
 458                 break;
 459         case l_topology_change:
 460                 priv->topology_change = mesg->content.normal.flag;
 461                 break;
 462         case l_flush_complete:
 463                 lec_flush_complete(priv, mesg->content.normal.flag);
 464                 break;
 465         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 466                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 467                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 468                 lec_arp_remove(priv, entry);
 469                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 470
 471                 if (mesg->content.normal.no_source_le_narp)
 472                         break;
 473                 /* FALL THROUGH */
 474         case l_arp_update:
 475                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 476                                mesg->content.normal.atm_addr,
 477                                mesg->content.normal.flag,
 478                                mesg->content.normal.targetless_le_arp);
 479                 pr_debug("lec: in l_arp_update\n");
 480                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 481                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 482                                 mesg->sizeoftlvs);
 483                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 484                                             tmp, mesg->sizeoftlvs);
 485                 }
 486                 break;
 487         case l_config:
 488                 priv->maximum_unknown_frame_count =
 489                     mesg->content.config.maximum_unknown_frame_count;
 490                 priv->max_unknown_frame_time =
 491                     (mesg->content.config.max_unknown_frame_time * HZ);
 492                 priv->max_retry_count = mesg->content.config.max_retry_count;
 493                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 494                 priv->forward_delay_time =
 495                     (mesg->content.config.forward_delay_time * HZ);
 496                 priv->arp_response_time =
 497                     (mesg->content.config.arp_response_time * HZ);
 498                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 499                 priv->path_switching_delay =
 500                     (mesg->content.config.path_switching_delay * HZ);
 501                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 502                 priv->lane2_ops = NULL;
 503                 if (priv->lane_version > 1)
 504                         priv->lane2_ops = &lane2_ops;
 505                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 506                         printk("%s: change_mtu to %d failed\n", dev->name,
 507                                mesg->content.config.mtu);
 508                 priv->is_proxy = mesg->content.config.is_proxy;
 509                 break;
 510         case l_flush_tran_id:
 511                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 512                                       mesg->content.normal.flag);
 513                 break;
 514         case l_set_lecid:
 515                 priv->lecid =
 516                     (unsigned short)(0xffff & mesg->content.normal.flag);
 517                 break;
 518         case l_should_bridge:
 519 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 520                 {
 521                         pr_debug("%s: bridge zeppelin asks about %pM\n",
 522                                  dev->name, mesg->content.proxy.mac_addr);
 523
 524                         if (br_fdb_test_addr_hook == NULL)
 525                                 break;
 526
 527                         if (br_fdb_test_addr_hook(dev,
 528                                         mesg->content.proxy.mac_addr)) {
 529                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 530                                 struct sk_buff *skb2;
 531                                 struct sock *sk;
 532
 533                                 pr_debug
 534                                     ("%s: entry found, responding to zeppelin\n",
 535                                      dev->name);
 536                                 skb2 =
 537                                     alloc_skb(sizeof(struct atmlec_msg),
 538                                               GFP_ATOMIC);
 539                                 if (skb2 == NULL)
 540                                         break;
 541                                 skb2->len = sizeof(struct atmlec_msg);
 542                                 skb_copy_to_linear_data(skb2, mesg,
 543                                                         sizeof(*mesg));
 544                                 atm_force_charge(priv->lecd, skb2->truesize);
 545                                 sk = sk_atm(priv->lecd);
 546                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 547                                 sk->sk_data_ready(sk, skb2->len);
 548                         }
 549                 }
 550 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 551                 break;
 552         default:
 553                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 554                 dev_kfree_skb(skb);
 555                 return -EINVAL;
 556         }
 557         dev_kfree_skb(skb);
 558         return 0;
 559 }
 560
 561 static void lec_atm_close(struct atm_vcc *vcc)
 562 {
 563         struct sk_buff *skb;
 564         struct net_device *dev = (struct net_device *)vcc->proto_data;
 565         struct lec_priv *priv = netdev_priv(dev);
 566
 567         priv->lecd = NULL;
 568         /* Do something needful? */
 569
 570         netif_stop_queue(dev);
 571         lec_arp_destroy(priv);
 572
 573         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 574                 printk("%s lec_atm_close: closing with messages pending\n",
 575                        dev->name);
 576         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 577                 atm_return(vcc, skb->truesize);
 578                 dev_kfree_skb(skb);
 579         }
 580
 581         printk("%s: Shut down!\n", dev->name);
 582         module_put(THIS_MODULE);
 583 }
 584
 585 static struct atmdev_ops lecdev_ops = {
 586         .close = lec_atm_close,
 587         .send = lec_atm_send
 588 };
 589
 590 static struct atm_dev lecatm_dev = {
 591         .ops = &lecdev_ops,
 592         .type = "lec",
 593         .number = 999,          /* dummy device number */
 594         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 595 };
 596
 597 /*
 598  * LANE2: new argument struct sk_buff *data contains
 599  * the LE_ARP based TLVs introduced in the LANE2 spec
 600  */
 601 static int
 602 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 603              const unsigned char *mac_addr, const unsigned char *atm_addr,
 604              struct sk_buff *data)
 605 {
 606         struct sock *sk;
 607         struct sk_buff *skb;
 608         struct atmlec_msg *mesg;
 609
 610         if (!priv || !priv->lecd) {
 611                 return -1;
 612         }
 613         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 614         if (!skb)
 615                 return -1;
 616         skb->len = sizeof(struct atmlec_msg);
 617         mesg = (struct atmlec_msg *)skb->data;
 618         memset(mesg, 0, sizeof(struct atmlec_msg));
 619         mesg->type = type;
 620         if (data != NULL)
 621                 mesg->sizeoftlvs = data->len;
 622         if (mac_addr)
 623                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 624         else
 625                 mesg->content.normal.targetless_le_arp = 1;
 626         if (atm_addr)
 627                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 628
 629         atm_force_charge(priv->lecd, skb->truesize);
 630         sk = sk_atm(priv->lecd);
 631         skb_queue_tail(&sk->sk_receive_queue, skb);
 632         sk->sk_data_ready(sk, skb->len);
 633
 634         if (data != NULL) {
 635                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 636                 atm_force_charge(priv->lecd, data->truesize);
 637                 skb_queue_tail(&sk->sk_receive_queue, data);
 638                 sk->sk_data_ready(sk, skb->len);
 639         }
 640
 641         return 0;
 642 }
 643
 644 /* shamelessly stolen from drivers/net/net_init.c */
 645 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 646 {
 647         if ((new_mtu < 68) || (new_mtu > 18190))
 648                 return -EINVAL;
 649         dev->mtu = new_mtu;
 650         return 0;
 651 }
 652
 653 static void lec_set_multicast_list(struct net_device *dev)
 654 {
 655         /*
 656          * by default, all multicast frames arrive over the bus.
 657          * eventually support selective multicast service
 658          */
 659         return;
 660 }
 661
 662 static const struct net_device_ops lec_netdev_ops = {
 663         .ndo_open               = lec_open,
 664         .ndo_stop               = lec_close,
 665         .ndo_start_xmit         = lec_start_xmit,
 666         .ndo_change_mtu         = lec_change_mtu,
 667         .ndo_tx_timeout         = lec_tx_timeout,
 668         .ndo_set_multicast_list = lec_set_multicast_list,
 669 };
 670
 671
 672 static void lec_init(struct net_device *dev)
 673 {
 674         dev->netdev_ops = &lec_netdev_ops;
 675         printk("%s: Initialized!\n", dev->name);
 676 }
 677
 678 static const unsigned char lec_ctrl_magic[] = {
 679         0xff,
 680         0x00,
 681         0x01,
 682         0x01
 683 };
 684
 685 #define LEC_DATA_DIRECT_8023  2
 686 #define LEC_DATA_DIRECT_8025  3
 687
 688 static int lec_is_data_direct(struct atm_vcc *vcc)
 689 {
 690         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 691                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 692 }
 693
 694 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 695 {
 696         unsigned long flags;
 697         struct net_device *dev = (struct net_device *)vcc->proto_data;
 698         struct lec_priv *priv = netdev_priv(dev);
 699
 700 #if DUMP_PACKETS >0
 701         int i = 0;
 702         char buf[300];
 703
 704         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 705                vcc->vpi, vcc->vci);
 706 #endif
 707         if (!skb) {
 708                 pr_debug("%s: null skb\n", dev->name);
 709                 lec_vcc_close(priv, vcc);
 710                 return;
 711         }
 712 #if DUMP_PACKETS > 0
 713         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 714                skb->len, priv->lecid);
 715 #if DUMP_PACKETS >= 2
 716         for (i = 0; i < skb->len && i < 99; i++) {
 717                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 718         }
 719 #elif DUMP_PACKETS >= 1
 720         for (i = 0; i < skb->len && i < 30; i++) {
 721                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 722         }
 723 #endif /* DUMP_PACKETS >= 1 */
 724         if (i == skb->len)
 725                 printk("%s\n", buf);
 726         else
 727                 printk("%s...\n", buf);
 728 #endif /* DUMP_PACKETS > 0 */
 729         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 730                 struct sock *sk = sk_atm(vcc);
 731
 732                 pr_debug("%s: To daemon\n", dev->name);
 733                 skb_queue_tail(&sk->sk_receive_queue, skb);
 734                 sk->sk_data_ready(sk, skb->len);
 735         } else {                /* Data frame, queue to protocol handlers */
 736                 struct lec_arp_table *entry;
 737                 unsigned char *src, *dst;
 738
 739                 atm_return(vcc, skb->truesize);
 740                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 741                     !priv->lecd || !(dev->flags & IFF_UP)) {
 742                         /*
 743                          * Probably looping back, or if lecd is missing,
 744                          * lecd has gone down
 745                          */
 746                         pr_debug("Ignoring frame...\n");
 747                         dev_kfree_skb(skb);
 748                         return;
 749                 }
 750 #ifdef CONFIG_TR
 751                 if (priv->is_trdev)
 752                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 753                 else
 754 #endif
 755                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 756
 757                 /*
 758                  * If this is a Data Direct VCC, and the VCC does not match
 759                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 760                  */
 761                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 762                 if (lec_is_data_direct(vcc)) {
 763 #ifdef CONFIG_TR
 764                         if (priv->is_trdev)
 765                                 src =
 766                                     ((struct lecdatahdr_8025 *)skb->data)->
 767                                     h_source;
 768                         else
 769 #endif
 770                                 src =
 771                                     ((struct lecdatahdr_8023 *)skb->data)->
 772                                     h_source;
 773                         entry = lec_arp_find(priv, src);
 774                         if (entry && entry->vcc != vcc) {
 775                                 lec_arp_remove(priv, entry);
 776                                 lec_arp_put(entry);
 777                         }
 778                 }
 779                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 780
 781                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 782                     !priv->is_proxy &&  /* Proxy wants all the packets */
 783                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 784                         dev_kfree_skb(skb);
 785                         return;
 786                 }
 787                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 788                         lec_arp_check_empties(priv, vcc, skb);
 789                 }
 790                 skb_pull(skb, 2);       /* skip lec_id */
 791 #ifdef CONFIG_TR
 792                 if (priv->is_trdev)
 793                         skb->protocol = tr_type_trans(skb, dev);
 794                 else
 795 #endif
 796                         skb->protocol = eth_type_trans(skb, dev);
 797                 dev->stats.rx_packets++;
 798                 dev->stats.rx_bytes += skb->len;
 799                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 800                 netif_rx(skb);
 801         }
 802 }
 803
 804 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 805 {
 806         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 807         struct net_device *dev = skb->dev;
 808
 809         if (vpriv == NULL) {
 810                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 811                 return;
 812         }
 813
 814         vpriv->old_pop(vcc, skb);
 815
 816         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 817                 vpriv->xoff = 0;
 818                 if (netif_running(dev) && netif_queue_stopped(dev))
 819                         netif_wake_queue(dev);
 820         }
 821 }
 822
 823 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 824 {
 825         struct lec_vcc_priv *vpriv;
 826         int bytes_left;
 827         struct atmlec_ioc ioc_data;
 828
 829         /* Lecd must be up in this case */
 830         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 831         if (bytes_left != 0) {
 832                 printk
 833                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 834                      bytes_left);
 835         }
 836         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 837             !dev_lec[ioc_data.dev_num])
 838                 return -EINVAL;
 839         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 840                 return -ENOMEM;
 841         vpriv->xoff = 0;
 842         vpriv->old_pop = vcc->pop;
 843         vcc->user_back = vpriv;
 844         vcc->pop = lec_pop;
 845         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 846                       &ioc_data, vcc, vcc->push);
 847         vcc->proto_data = dev_lec[ioc_data.dev_num];
 848         vcc->push = lec_push;
 849         return 0;
 850 }
 851
 852 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 853 {
 854         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 855                 return -EINVAL;
 856         vcc->proto_data = dev_lec[arg];
 857         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 858                                 vcc);
 859 }
 860
 861 /* Initialize device. */
 862 static int lecd_attach(struct atm_vcc *vcc, int arg)
 863 {
 864         int i;
 865         struct lec_priv *priv;
 866
 867         if (arg < 0)
 868                 i = 0;
 869         else
 870                 i = arg;
 871 #ifdef CONFIG_TR
 872         if (arg >= MAX_LEC_ITF)
 873                 return -EINVAL;
 874 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 875         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 876                 return -EINVAL;
 877 #endif
 878         if (!dev_lec[i]) {
 879                 int is_trdev, size;
 880
 881                 is_trdev = 0;
 882                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 883                         is_trdev = 1;
 884
 885                 size = sizeof(struct lec_priv);
 886 #ifdef CONFIG_TR
 887                 if (is_trdev)
 888                         dev_lec[i] = alloc_trdev(size);
 889                 else
 890 #endif
 891                         dev_lec[i] = alloc_etherdev(size);
 892                 if (!dev_lec[i])
 893                         return -ENOMEM;
 894                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 895                 if (register_netdev(dev_lec[i])) {
 896                         free_netdev(dev_lec[i]);
 897                         return -EINVAL;
 898                 }
 899
 900                 priv = netdev_priv(dev_lec[i]);
 901                 priv->is_trdev = is_trdev;
 902                 lec_init(dev_lec[i]);
 903         } else {
 904                 priv = netdev_priv(dev_lec[i]);
 905                 if (priv->lecd)
 906                         return -EADDRINUSE;
 907         }
 908         lec_arp_init(priv);
 909         priv->itfnum = i;       /* LANE2 addition */
 910         priv->lecd = vcc;
 911         vcc->dev = &lecatm_dev;
 912         vcc_insert_socket(sk_atm(vcc));
 913
 914         vcc->proto_data = dev_lec[i];
 915         set_bit(ATM_VF_META, &vcc->flags);
 916         set_bit(ATM_VF_READY, &vcc->flags);
 917
 918         /* Set default values to these variables */
 919         priv->maximum_unknown_frame_count = 1;
 920         priv->max_unknown_frame_time = (1 * HZ);
 921         priv->vcc_timeout_period = (1200 * HZ);
 922         priv->max_retry_count = 1;
 923         priv->aging_time = (300 * HZ);
 924         priv->forward_delay_time = (15 * HZ);
 925         priv->topology_change = 0;
 926         priv->arp_response_time = (1 * HZ);
 927         priv->flush_timeout = (4 * HZ);
 928         priv->path_switching_delay = (6 * HZ);
 929
 930         if (dev_lec[i]->flags & IFF_UP) {
 931                 netif_start_queue(dev_lec[i]);
 932         }
 933         __module_get(THIS_MODULE);
 934         return i;
 935 }
 936
 937 #ifdef CONFIG_PROC_FS
 938 static char *lec_arp_get_status_string(unsigned char status)
 939 {
 940         static char *lec_arp_status_string[] = {
 941                 "ESI_UNKNOWN       ",
 942                 "ESI_ARP_PENDING   ",
 943                 "ESI_VC_PENDING    ",
 944                 "<Undefined>       ",
 945                 "ESI_FLUSH_PENDING ",
 946                 "ESI_FORWARD_DIRECT"
 947         };
 948
 949         if (status > ESI_FORWARD_DIRECT)
 950                 status = 3;     /* ESI_UNDEFINED */
 951         return lec_arp_status_string[status];
 952 }
 953
 954 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 955 {
 956         int i;
 957
 958         for (i = 0; i < ETH_ALEN; i++)
 959                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 960         seq_printf(seq, " ");
 961         for (i = 0; i < ATM_ESA_LEN; i++)
 962                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 963         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 964                    entry->flags & 0xffff);
 965         if (entry->vcc)
 966                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 967         else
 968                 seq_printf(seq, "        ");
 969         if (entry->recv_vcc) {
 970                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 971                            entry->recv_vcc->vci);
 972         }
 973         seq_putc(seq, '\n');
 974 }
 975
 976 struct lec_state {
 977         unsigned long flags;
 978         struct lec_priv *locked;
 979         struct hlist_node *node;
 980         struct net_device *dev;
 981         int itf;
 982         int arp_table;
 983         int misc_table;
 984 };
 985
 986 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 987                           loff_t *l)
 988 {
 989         struct hlist_node *e = state->node;
 990         struct lec_arp_table *tmp;
 991
 992         if (!e)
 993                 e = tbl->first;
 994         if (e == SEQ_START_TOKEN) {
 995                 e = tbl->first;
 996                 --*l;
 997         }
 998
 999         hlist_for_each_entry_from(tmp, e, next) {
1000                 if (--*l < 0)
1001                         break;
1002         }
1003         state->node = e;
1004
1005         return (*l < 0) ? state : NULL;
1006 }
1007
1008 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1009                           struct lec_priv *priv)
1010 {
1011         void *v = NULL;
1012         int p;
1013
1014         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1015                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1016                 if (v)
1017                         break;
1018         }
1019         state->arp_table = p;
1020         return v;
1021 }
1022
1023 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1024                            struct lec_priv *priv)
1025 {
1026         struct hlist_head *lec_misc_tables[] = {
1027                 &priv->lec_arp_empty_ones,
1028                 &priv->lec_no_forward,
1029                 &priv->mcast_fwds
1030         };
1031         void *v = NULL;
1032         int q;
1033
1034         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1035                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1036                 if (v)
1037                         break;
1038         }
1039         state->misc_table = q;
1040         return v;
1041 }
1042
1043 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1044                            struct lec_priv *priv)
1045 {
1046         if (!state->locked) {
1047                 state->locked = priv;
1048                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1049         }
1050         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1051                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1052                 state->locked = NULL;
1053                 /* Partial state reset for the next time we get called */
1054                 state->arp_table = state->misc_table = 0;
1055         }
1056         return state->locked;
1057 }
1058
1059 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1060 {
1061         struct net_device *dev;
1062         void *v;
1063
1064         dev = state->dev ? state->dev : dev_lec[state->itf];
1065         v = (dev && netdev_priv(dev)) ?
1066                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1067         if (!v && dev) {
1068                 dev_put(dev);
1069                 /* Partial state reset for the next time we get called */
1070                 dev = NULL;
1071         }
1072         state->dev = dev;
1073         return v;
1074 }
1075
1076 static void *lec_get_idx(struct lec_state *state, loff_t l)
1077 {
1078         void *v = NULL;
1079
1080         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1081                 v = lec_itf_walk(state, &l);
1082                 if (v)
1083                         break;
1084         }
1085         return v;
1086 }
1087
1088 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1089 {
1090         struct lec_state *state = seq->private;
1091
1092         state->itf = 0;
1093         state->dev = NULL;
1094         state->locked = NULL;
1095         state->arp_table = 0;
1096         state->misc_table = 0;
1097         state->node = SEQ_START_TOKEN;
1098
1099         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1100 }
1101
1102 static void lec_seq_stop(struct seq_file *seq, void *v)
1103 {
1104         struct lec_state *state = seq->private;
1105
1106         if (state->dev) {
1107                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1108                                        state->flags);
1109                 dev_put(state->dev);
1110         }
1111 }
1112
1113 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1114 {
1115         struct lec_state *state = seq->private;
1116
1117         v = lec_get_idx(state, 1);
1118         *pos += !!PTR_ERR(v);
1119         return v;
1120 }
1121
1122 static int lec_seq_show(struct seq_file *seq, void *v)
1123 {
1124         static char lec_banner[] = "Itf  MAC          ATM destination"
1125             "                          Status            Flags "
1126             "VPI/VCI Recv VPI/VCI\n";
1127
1128         if (v == SEQ_START_TOKEN)
1129                 seq_puts(seq, lec_banner);
1130         else {
1131                 struct lec_state *state = seq->private;
1132                 struct net_device *dev = state->dev;
1133                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1134
1135                 seq_printf(seq, "%s ", dev->name);
1136                 lec_info(seq, entry);
1137         }
1138         return 0;
1139 }
1140
1141 static const struct seq_operations lec_seq_ops = {
1142         .start = lec_seq_start,
1143         .next = lec_seq_next,
1144         .stop = lec_seq_stop,
1145         .show = lec_seq_show,
1146 };
1147
1148 static int lec_seq_open(struct inode *inode, struct file *file)
1149 {
1150         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1151 }
1152
1153 static const struct file_operations lec_seq_fops = {
1154         .owner = THIS_MODULE,
1155         .open = lec_seq_open,
1156         .read = seq_read,
1157         .llseek = seq_lseek,
1158         .release = seq_release_private,
1159 };
1160 #endif
1161
1162 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1163 {
1164         struct atm_vcc *vcc = ATM_SD(sock);
1165         int err = 0;
1166
1167         switch (cmd) {
1168         case ATMLEC_CTRL:
1169         case ATMLEC_MCAST:
1170         case ATMLEC_DATA:
1171                 if (!capable(CAP_NET_ADMIN))
1172                         return -EPERM;
1173                 break;
1174         default:
1175                 return -ENOIOCTLCMD;
1176         }
1177
1178         switch (cmd) {
1179         case ATMLEC_CTRL:
1180                 err = lecd_attach(vcc, (int)arg);
1181                 if (err >= 0)
1182                         sock->state = SS_CONNECTED;
1183                 break;
1184         case ATMLEC_MCAST:
1185                 err = lec_mcast_attach(vcc, (int)arg);
1186                 break;
1187         case ATMLEC_DATA:
1188                 err = lec_vcc_attach(vcc, (void __user *)arg);
1189                 break;
1190         }
1191
1192         return err;
1193 }
1194
1195 static struct atm_ioctl lane_ioctl_ops = {
1196         .owner = THIS_MODULE,
1197         .ioctl = lane_ioctl,
1198 };
1199
1200 static int __init lane_module_init(void)
1201 {
1202 #ifdef CONFIG_PROC_FS
1203         struct proc_dir_entry *p;
1204
1205         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1206         if (!p) {
1207                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1208                 return -ENOMEM;
1209         }
1210 #endif
1211
1212         register_atm_ioctl(&lane_ioctl_ops);
1213         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1214         return 0;
1215 }
1216
1217 static void __exit lane_module_cleanup(void)
1218 {
1219         int i;
1220         struct lec_priv *priv;
1221
1222         remove_proc_entry("lec", atm_proc_root);
1223
1224         deregister_atm_ioctl(&lane_ioctl_ops);
1225
1226         for (i = 0; i < MAX_LEC_ITF; i++) {
1227                 if (dev_lec[i] != NULL) {
1228                         priv = netdev_priv(dev_lec[i]);
1229                         unregister_netdev(dev_lec[i]);
1230                         free_netdev(dev_lec[i]);
1231                         dev_lec[i] = NULL;
1232                 }
1233         }
1234
1235         return;
1236 }
1237
1238 module_init(lane_module_init);
1239 module_exit(lane_module_cleanup);
1240
1241 /*
1242  * LANE2: 3.1.3, LE_RESOLVE.request
1243  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1244  * If sizeoftlvs == NULL the default TLVs associated with with this
1245  * lec will be used.
1246  * If dst_mac == NULL, targetless LE_ARP will be sent
1247  */
1248 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1249                          u8 **tlvs, u32 *sizeoftlvs)
1250 {
1251         unsigned long flags;
1252         struct lec_priv *priv = netdev_priv(dev);
1253         struct lec_arp_table *table;
1254         struct sk_buff *skb;
1255         int retval;
1256
1257         if (force == 0) {
1258                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1259                 table = lec_arp_find(priv, dst_mac);
1260                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1261                 if (table == NULL)
1262                         return -1;
1263
1264                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1265                 if (*tlvs == NULL)
1266                         return -1;
1267
1268                 *sizeoftlvs = table->sizeoftlvs;
1269
1270                 return 0;
1271         }
1272
1273         if (sizeoftlvs == NULL)
1274                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1275
1276         else {
1277                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1278                 if (skb == NULL)
1279                         return -1;
1280                 skb->len = *sizeoftlvs;
1281                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1282                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1283         }
1284         return retval;
1285 }
1286
1287 /*
1288  * LANE2: 3.1.4, LE_ASSOCIATE.request
1289  * Associate the *tlvs with the *lan_dst address.
1290  * Will overwrite any previous association
1291  * Returns 1 for success, 0 for failure (out of memory)
1292  *
1293  */
1294 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1295                                const u8 *tlvs, u32 sizeoftlvs)
1296 {
1297         int retval;
1298         struct sk_buff *skb;
1299         struct lec_priv *priv = netdev_priv(dev);
1300
1301         if (compare_ether_addr(lan_dst, dev->dev_addr))
1302                 return (0);     /* not our mac address */
1303
1304         kfree(priv->tlvs);      /* NULL if there was no previous association */
1305
1306         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1307         if (priv->tlvs == NULL)
1308                 return (0);
1309         priv->sizeoftlvs = sizeoftlvs;
1310
1311         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1312         if (skb == NULL)
1313                 return 0;
1314         skb->len = sizeoftlvs;
1315         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1316         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1317         if (retval != 0)
1318                 printk("lec.c: lane2_associate_req() failed\n");
1319         /*
1320          * If the previous association has changed we must
1321          * somehow notify other LANE entities about the change
1322          */
1323         return (1);
1324 }
1325
1326 /*
1327  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1328  *
1329  */
1330 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1331                                 const u8 *tlvs, u32 sizeoftlvs)
1332 {
1333 #if 0
1334         int i = 0;
1335 #endif
1336         struct lec_priv *priv = netdev_priv(dev);
1337 #if 0                           /*
1338                                  * Why have the TLVs in LE_ARP entries
1339                                  * since we do not use them? When you
1340                                  * uncomment this code, make sure the
1341                                  * TLVs get freed when entry is killed
1342                                  */
1343         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1344
1345         if (entry == NULL)
1346                 return;         /* should not happen */
1347
1348         kfree(entry->tlvs);
1349
1350         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1351         if (entry->tlvs == NULL)
1352                 return;
1353         entry->sizeoftlvs = sizeoftlvs;
1354 #endif
1355 #if 0
1356         printk("lec.c: lane2_associate_ind()\n");
1357         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1358         while (i < sizeoftlvs)
1359                 printk("%02x ", tlvs[i++]);
1360
1361         printk("\n");
1362 #endif
1363
1364         /* tell MPOA about the TLVs we saw */
1365         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1366                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1367                                                      tlvs, sizeoftlvs);
1368         }
1369         return;
1370 }
1371
1372 /*
1373  * Here starts what used to lec_arpc.c
1374  *
1375  * lec_arpc.c was added here when making
1376  * lane client modular. October 1997
1377  */
1378
1379 #include <linux/types.h>
1380 #include <linux/timer.h>
1381 #include <asm/param.h>
1382 #include <asm/atomic.h>
1383 #include <linux/inetdevice.h>
1384 #include <net/route.h>
1385
1386 #if 0
1387 #define pr_debug(format,args...)
1388 /*
1389 #define pr_debug printk
1390 */
1391 #endif
1392 #define DEBUG_ARP_TABLE 0
1393
1394 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1395
1396 static void lec_arp_check_expire(struct work_struct *work);
1397 static void lec_arp_expire_arp(unsigned long data);
1398
1399 /*
1400  * Arp table funcs
1401  */
1402
1403 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1404
1405 /*
1406  * Initialization of arp-cache
1407  */
1408 static void lec_arp_init(struct lec_priv *priv)
1409 {
1410         unsigned short i;
1411
1412         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1413                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1414         }
1415         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1416         INIT_HLIST_HEAD(&priv->lec_no_forward);
1417         INIT_HLIST_HEAD(&priv->mcast_fwds);
1418         spin_lock_init(&priv->lec_arp_lock);
1419         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1420         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1421 }
1422
1423 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1424 {
1425         if (entry->vcc) {
1426                 struct atm_vcc *vcc = entry->vcc;
1427                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1428                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1429
1430                 vcc->pop = vpriv->old_pop;
1431                 if (vpriv->xoff)
1432                         netif_wake_queue(dev);
1433                 kfree(vpriv);
1434                 vcc->user_back = NULL;
1435                 vcc->push = entry->old_push;
1436                 vcc_release_async(vcc, -EPIPE);
1437                 entry->vcc = NULL;
1438         }
1439         if (entry->recv_vcc) {
1440                 entry->recv_vcc->push = entry->old_recv_push;
1441                 vcc_release_async(entry->recv_vcc, -EPIPE);
1442                 entry->recv_vcc = NULL;
1443         }
1444 }
1445
1446 /*
1447  * Insert entry to lec_arp_table
1448  * LANE2: Add to the end of the list to satisfy 8.1.13
1449  */
1450 static inline void
1451 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1452 {
1453         struct hlist_head *tmp;
1454
1455         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1456         hlist_add_head(&entry->next, tmp);
1457
1458         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1459                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1460                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1461                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1462 }
1463
1464 /*
1465  * Remove entry from lec_arp_table
1466  */
1467 static int
1468 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1469 {
1470         struct hlist_node *node;
1471         struct lec_arp_table *entry;
1472         int i, remove_vcc = 1;
1473
1474         if (!to_remove) {
1475                 return -1;
1476         }
1477
1478         hlist_del(&to_remove->next);
1479         del_timer(&to_remove->timer);
1480
1481         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1482         if (to_remove->status >= ESI_FLUSH_PENDING) {
1483                 /*
1484                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1485                  */
1486                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1487                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1488                                 if (memcmp(to_remove->atm_addr,
1489                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1490                                         remove_vcc = 0;
1491                                         break;
1492                                 }
1493                         }
1494                 }
1495                 if (remove_vcc)
1496                         lec_arp_clear_vccs(to_remove);
1497         }
1498         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1499
1500         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1501                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1502                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1503                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1504         return 0;
1505 }
1506
1507 #if DEBUG_ARP_TABLE
1508 static char *get_status_string(unsigned char st)
1509 {
1510         switch (st) {
1511         case ESI_UNKNOWN:
1512                 return "ESI_UNKNOWN";
1513         case ESI_ARP_PENDING:
1514                 return "ESI_ARP_PENDING";
1515         case ESI_VC_PENDING:
1516                 return "ESI_VC_PENDING";
1517         case ESI_FLUSH_PENDING:
1518                 return "ESI_FLUSH_PENDING";
1519         case ESI_FORWARD_DIRECT:
1520                 return "ESI_FORWARD_DIRECT";
1521         default:
1522                 return "<UNKNOWN>";
1523         }
1524 }
1525
1526 static void dump_arp_table(struct lec_priv *priv)
1527 {
1528         struct hlist_node *node;
1529         struct lec_arp_table *rulla;
1530         char buf[256];
1531         int i, j, offset;
1532
1533         printk("Dump %p:\n", priv);
1534         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1535                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1536                         offset = 0;
1537                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1538                         offset += sprintf(buf + offset, "Mac:");
1539                         for (j = 0; j < ETH_ALEN; j++) {
1540                                 offset += sprintf(buf + offset,
1541                                                   "%2.2x ",
1542                                                   rulla->mac_addr[j] & 0xff);
1543                         }
1544                         offset += sprintf(buf + offset, "Atm:");
1545                         for (j = 0; j < ATM_ESA_LEN; j++) {
1546                                 offset += sprintf(buf + offset,
1547                                                   "%2.2x ",
1548                                                   rulla->atm_addr[j] & 0xff);
1549                         }
1550                         offset += sprintf(buf + offset,
1551                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1552                                           rulla->vcc ? rulla->vcc->vpi : 0,
1553                                           rulla->vcc ? rulla->vcc->vci : 0,
1554                                           rulla->recv_vcc ? rulla->recv_vcc->
1555                                           vpi : 0,
1556                                           rulla->recv_vcc ? rulla->recv_vcc->
1557                                           vci : 0, rulla->last_used,
1558                                           rulla->timestamp, rulla->no_tries);
1559                         offset +=
1560                             sprintf(buf + offset,
1561                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1562                                     rulla->flags, rulla->packets_flooded,
1563                                     get_status_string(rulla->status));
1564                         printk("%s\n", buf);
1565                 }
1566         }
1567
1568         if (!hlist_empty(&priv->lec_no_forward))
1569                 printk("No forward\n");
1570         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1571                 offset = 0;
1572                 offset += sprintf(buf + offset, "Mac:");
1573                 for (j = 0; j < ETH_ALEN; j++) {
1574                         offset += sprintf(buf + offset, "%2.2x ",
1575                                           rulla->mac_addr[j] & 0xff);
1576                 }
1577                 offset += sprintf(buf + offset, "Atm:");
1578                 for (j = 0; j < ATM_ESA_LEN; j++) {
1579                         offset += sprintf(buf + offset, "%2.2x ",
1580                                           rulla->atm_addr[j] & 0xff);
1581                 }
1582                 offset += sprintf(buf + offset,
1583                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1584                                   rulla->vcc ? rulla->vcc->vpi : 0,
1585                                   rulla->vcc ? rulla->vcc->vci : 0,
1586                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1587                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1588                                   rulla->last_used,
1589                                   rulla->timestamp, rulla->no_tries);
1590                 offset += sprintf(buf + offset,
1591                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1592                                   rulla->flags, rulla->packets_flooded,
1593                                   get_status_string(rulla->status));
1594                 printk("%s\n", buf);
1595         }
1596
1597         if (!hlist_empty(&priv->lec_arp_empty_ones))
1598                 printk("Empty ones\n");
1599         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1600                 offset = 0;
1601                 offset += sprintf(buf + offset, "Mac:");
1602                 for (j = 0; j < ETH_ALEN; j++) {
1603                         offset += sprintf(buf + offset, "%2.2x ",
1604                                           rulla->mac_addr[j] & 0xff);
1605                 }
1606                 offset += sprintf(buf + offset, "Atm:");
1607                 for (j = 0; j < ATM_ESA_LEN; j++) {
1608                         offset += sprintf(buf + offset, "%2.2x ",
1609                                           rulla->atm_addr[j] & 0xff);
1610                 }
1611                 offset += sprintf(buf + offset,
1612                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1613                                   rulla->vcc ? rulla->vcc->vpi : 0,
1614                                   rulla->vcc ? rulla->vcc->vci : 0,
1615                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1616                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1617                                   rulla->last_used,
1618                                   rulla->timestamp, rulla->no_tries);
1619                 offset += sprintf(buf + offset,
1620                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1621                                   rulla->flags, rulla->packets_flooded,
1622                                   get_status_string(rulla->status));
1623                 printk("%s", buf);
1624         }
1625
1626         if (!hlist_empty(&priv->mcast_fwds))
1627                 printk("Multicast Forward VCCs\n");
1628         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1629                 offset = 0;
1630                 offset += sprintf(buf + offset, "Mac:");
1631                 for (j = 0; j < ETH_ALEN; j++) {
1632                         offset += sprintf(buf + offset, "%2.2x ",
1633                                           rulla->mac_addr[j] & 0xff);
1634                 }
1635                 offset += sprintf(buf + offset, "Atm:");
1636                 for (j = 0; j < ATM_ESA_LEN; j++) {
1637                         offset += sprintf(buf + offset, "%2.2x ",
1638                                           rulla->atm_addr[j] & 0xff);
1639                 }
1640                 offset += sprintf(buf + offset,
1641                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1642                                   rulla->vcc ? rulla->vcc->vpi : 0,
1643                                   rulla->vcc ? rulla->vcc->vci : 0,
1644                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1645                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1646                                   rulla->last_used,
1647                                   rulla->timestamp, rulla->no_tries);
1648                 offset += sprintf(buf + offset,
1649                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1650                                   rulla->flags, rulla->packets_flooded,
1651                                   get_status_string(rulla->status));
1652                 printk("%s\n", buf);
1653         }
1654
1655 }
1656 #else
1657 #define dump_arp_table(priv) do { } while (0)
1658 #endif
1659
1660 /*
1661  * Destruction of arp-cache
1662  */
1663 static void lec_arp_destroy(struct lec_priv *priv)
1664 {
1665         unsigned long flags;
1666         struct hlist_node *node, *next;
1667         struct lec_arp_table *entry;
1668         int i;
1669
1670         cancel_rearming_delayed_work(&priv->lec_arp_work);
1671
1672         /*
1673          * Remove all entries
1674          */
1675
1676         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1677         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1678                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1679                         lec_arp_remove(priv, entry);
1680                         lec_arp_put(entry);
1681                 }
1682                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1683         }
1684
1685         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1686                 del_timer_sync(&entry->timer);
1687                 lec_arp_clear_vccs(entry);
1688                 hlist_del(&entry->next);
1689                 lec_arp_put(entry);
1690         }
1691         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1692
1693         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1694                 del_timer_sync(&entry->timer);
1695                 lec_arp_clear_vccs(entry);
1696                 hlist_del(&entry->next);
1697                 lec_arp_put(entry);
1698         }
1699         INIT_HLIST_HEAD(&priv->lec_no_forward);
1700
1701         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1702                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1703                 lec_arp_clear_vccs(entry);
1704                 hlist_del(&entry->next);
1705                 lec_arp_put(entry);
1706         }
1707         INIT_HLIST_HEAD(&priv->mcast_fwds);
1708         priv->mcast_vcc = NULL;
1709         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1710 }
1711
1712 /*
1713  * Find entry by mac_address
1714  */
1715 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1716                                           const unsigned char *mac_addr)
1717 {
1718         struct hlist_node *node;
1719         struct hlist_head *head;
1720         struct lec_arp_table *entry;
1721
1722         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1723                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1724                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1725
1726         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1727         hlist_for_each_entry(entry, node, head, next) {
1728                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1729                         return entry;
1730                 }
1731         }
1732         return NULL;
1733 }
1734
1735 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1736                                         const unsigned char *mac_addr)
1737 {
1738         struct lec_arp_table *to_return;
1739
1740         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1741         if (!to_return) {
1742                 printk("LEC: Arp entry kmalloc failed\n");
1743                 return NULL;
1744         }
1745         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1746         INIT_HLIST_NODE(&to_return->next);
1747         setup_timer(&to_return->timer, lec_arp_expire_arp,
1748                         (unsigned long)to_return);
1749         to_return->last_used = jiffies;
1750         to_return->priv = priv;
1751         skb_queue_head_init(&to_return->tx_wait);
1752         atomic_set(&to_return->usage, 1);
1753         return to_return;
1754 }
1755
1756 /* Arp sent timer expired */
1757 static void lec_arp_expire_arp(unsigned long data)
1758 {
1759         struct lec_arp_table *entry;
1760
1761         entry = (struct lec_arp_table *)data;
1762
1763         pr_debug("lec_arp_expire_arp\n");
1764         if (entry->status == ESI_ARP_PENDING) {
1765                 if (entry->no_tries <= entry->priv->max_retry_count) {
1766                         if (entry->is_rdesc)
1767                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1768                                              entry->mac_addr, NULL, NULL);
1769                         else
1770                                 send_to_lecd(entry->priv, l_arp_xmt,
1771                                              entry->mac_addr, NULL, NULL);
1772                         entry->no_tries++;
1773                 }
1774                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1775         }
1776 }
1777
1778 /* Unknown/unused vcc expire, remove associated entry */
1779 static void lec_arp_expire_vcc(unsigned long data)
1780 {
1781         unsigned long flags;
1782         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1783         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1784
1785         del_timer(&to_remove->timer);
1786
1787         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1788                 to_remove, priv,
1789                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1790                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1791
1792         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1793         hlist_del(&to_remove->next);
1794         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1795
1796         lec_arp_clear_vccs(to_remove);
1797         lec_arp_put(to_remove);
1798 }
1799
1800 /*
1801  * Expire entries.
1802  * 1. Re-set timer
1803  * 2. For each entry, delete entries that have aged past the age limit.
1804  * 3. For each entry, depending on the status of the entry, perform
1805  *    the following maintenance.
1806  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1807  *       tick_count is above the max_unknown_frame_time, clear
1808  *       the tick_count to zero and clear the packets_flooded counter
1809  *       to zero. This supports the packet rate limit per address
1810  *       while flooding unknowns.
1811  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1812  *       than or equal to the path_switching_delay, change the status
1813  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1814  *       regardless of the progress of the flush protocol.
1815  */
1816 static void lec_arp_check_expire(struct work_struct *work)
1817 {
1818         unsigned long flags;
1819         struct lec_priv *priv =
1820                 container_of(work, struct lec_priv, lec_arp_work.work);
1821         struct hlist_node *node, *next;
1822         struct lec_arp_table *entry;
1823         unsigned long now;
1824         unsigned long time_to_check;
1825         int i;
1826
1827         pr_debug("lec_arp_check_expire %p\n", priv);
1828         now = jiffies;
1829 restart:
1830         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1831         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1832                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1833                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1834                             priv->topology_change)
1835                                 time_to_check = priv->forward_delay_time;
1836                         else
1837                                 time_to_check = priv->aging_time;
1838
1839                         pr_debug("About to expire: %lx - %lx > %lx\n",
1840                                 now, entry->last_used, time_to_check);
1841                         if (time_after(now, entry->last_used + time_to_check)
1842                             && !(entry->flags & LEC_PERMANENT_FLAG)
1843                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1844                                 /* Remove entry */
1845                                 pr_debug("LEC:Entry timed out\n");
1846                                 lec_arp_remove(priv, entry);
1847                                 lec_arp_put(entry);
1848                         } else {
1849                                 /* Something else */
1850                                 if ((entry->status == ESI_VC_PENDING ||
1851                                      entry->status == ESI_ARP_PENDING)
1852                                     && time_after_eq(now,
1853                                                      entry->timestamp +
1854                                                      priv->
1855                                                      max_unknown_frame_time)) {
1856                                         entry->timestamp = jiffies;
1857                                         entry->packets_flooded = 0;
1858                                         if (entry->status == ESI_VC_PENDING)
1859                                                 send_to_lecd(priv, l_svc_setup,
1860                                                              entry->mac_addr,
1861                                                              entry->atm_addr,
1862                                                              NULL);
1863                                 }
1864                                 if (entry->status == ESI_FLUSH_PENDING
1865                                     &&
1866                                     time_after_eq(now, entry->timestamp +
1867                                                   priv->path_switching_delay)) {
1868                                         struct sk_buff *skb;
1869                                         struct atm_vcc *vcc = entry->vcc;
1870
1871                                         lec_arp_hold(entry);
1872                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1873                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1874                                                 lec_send(vcc, skb);
1875                                         entry->last_used = jiffies;
1876                                         entry->status = ESI_FORWARD_DIRECT;
1877                                         lec_arp_put(entry);
1878                                         goto restart;
1879                                 }
1880                         }
1881                 }
1882         }
1883         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1884
1885         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1886 }
1887
1888 /*
1889  * Try to find vcc where mac_address is attached.
1890  *
1891  */
1892 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1893                                        const unsigned char *mac_to_find, int is_rdesc,
1894                                        struct lec_arp_table **ret_entry)
1895 {
1896         unsigned long flags;
1897         struct lec_arp_table *entry;
1898         struct atm_vcc *found;
1899
1900         if (mac_to_find[0] & 0x01) {
1901                 switch (priv->lane_version) {
1902                 case 1:
1903                         return priv->mcast_vcc;
1904                 case 2: /* LANE2 wants arp for multicast addresses */
1905                         if (!compare_ether_addr(mac_to_find, bus_mac))
1906                                 return priv->mcast_vcc;
1907                         break;
1908                 default:
1909                         break;
1910                 }
1911         }
1912
1913         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1914         entry = lec_arp_find(priv, mac_to_find);
1915
1916         if (entry) {
1917                 if (entry->status == ESI_FORWARD_DIRECT) {
1918                         /* Connection Ok */
1919                         entry->last_used = jiffies;
1920                         lec_arp_hold(entry);
1921                         *ret_entry = entry;
1922                         found = entry->vcc;
1923                         goto out;
1924                 }
1925                 /*
1926                  * If the LE_ARP cache entry is still pending, reset count to 0
1927                  * so another LE_ARP request can be made for this frame.
1928                  */
1929                 if (entry->status == ESI_ARP_PENDING) {
1930                         entry->no_tries = 0;
1931                 }
1932                 /*
1933                  * Data direct VC not yet set up, check to see if the unknown
1934                  * frame count is greater than the limit. If the limit has
1935                  * not been reached, allow the caller to send packet to
1936                  * BUS.
1937                  */
1938                 if (entry->status != ESI_FLUSH_PENDING &&
1939                     entry->packets_flooded <
1940                     priv->maximum_unknown_frame_count) {
1941                         entry->packets_flooded++;
1942                         pr_debug("LEC_ARP: Flooding..\n");
1943                         found = priv->mcast_vcc;
1944                         goto out;
1945                 }
1946                 /*
1947                  * We got here because entry->status == ESI_FLUSH_PENDING
1948                  * or BUS flood limit was reached for an entry which is
1949                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1950                  */
1951                 lec_arp_hold(entry);
1952                 *ret_entry = entry;
1953                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1954                         entry->vcc);
1955                 found = NULL;
1956         } else {
1957                 /* No matching entry was found */
1958                 entry = make_entry(priv, mac_to_find);
1959                 pr_debug("LEC_ARP: Making entry\n");
1960                 if (!entry) {
1961                         found = priv->mcast_vcc;
1962                         goto out;
1963                 }
1964                 lec_arp_add(priv, entry);
1965                 /* We want arp-request(s) to be sent */
1966                 entry->packets_flooded = 1;
1967                 entry->status = ESI_ARP_PENDING;
1968                 entry->no_tries = 1;
1969                 entry->last_used = entry->timestamp = jiffies;
1970                 entry->is_rdesc = is_rdesc;
1971                 if (entry->is_rdesc)
1972                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1973                                      NULL);
1974                 else
1975                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1976                 entry->timer.expires = jiffies + (1 * HZ);
1977                 entry->timer.function = lec_arp_expire_arp;
1978                 add_timer(&entry->timer);
1979                 found = priv->mcast_vcc;
1980         }
1981
1982 out:
1983         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1984         return found;
1985 }
1986
1987 static int
1988 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1989                 unsigned long permanent)
1990 {
1991         unsigned long flags;
1992         struct hlist_node *node, *next;
1993         struct lec_arp_table *entry;
1994         int i;
1995
1996         pr_debug("lec_addr_delete\n");
1997         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1998         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1999                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2000                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2001                             && (permanent ||
2002                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2003                                 lec_arp_remove(priv, entry);
2004                                 lec_arp_put(entry);
2005                         }
2006                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2007                         return 0;
2008                 }
2009         }
2010         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2011         return -1;
2012 }
2013
2014 /*
2015  * Notifies:  Response to arp_request (atm_addr != NULL)
2016  */
2017 static void
2018 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2019                const unsigned char *atm_addr, unsigned long remoteflag,
2020                unsigned int targetless_le_arp)
2021 {
2022         unsigned long flags;
2023         struct hlist_node *node, *next;
2024         struct lec_arp_table *entry, *tmp;
2025         int i;
2026
2027         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2028         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2029                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2030                 mac_addr[4], mac_addr[5]);
2031
2032         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2033         entry = lec_arp_find(priv, mac_addr);
2034         if (entry == NULL && targetless_le_arp)
2035                 goto out;       /*
2036                                  * LANE2: ignore targetless LE_ARPs for which
2037                                  * we have no entry in the cache. 7.1.30
2038                                  */
2039         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2040                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2041                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2042                                 hlist_del(&entry->next);
2043                                 del_timer(&entry->timer);
2044                                 tmp = lec_arp_find(priv, mac_addr);
2045                                 if (tmp) {
2046                                         del_timer(&tmp->timer);
2047                                         tmp->status = ESI_FORWARD_DIRECT;
2048                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2049                                         tmp->vcc = entry->vcc;
2050                                         tmp->old_push = entry->old_push;
2051                                         tmp->last_used = jiffies;
2052                                         del_timer(&entry->timer);
2053                                         lec_arp_put(entry);
2054                                         entry = tmp;
2055                                 } else {
2056                                         entry->status = ESI_FORWARD_DIRECT;
2057                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2058                                         entry->last_used = jiffies;
2059                                         lec_arp_add(priv, entry);
2060                                 }
2061                                 if (remoteflag)
2062                                         entry->flags |= LEC_REMOTE_FLAG;
2063                                 else
2064                                         entry->flags &= ~LEC_REMOTE_FLAG;
2065                                 pr_debug("After update\n");
2066                                 dump_arp_table(priv);
2067                                 goto out;
2068                         }
2069                 }
2070         }
2071
2072         entry = lec_arp_find(priv, mac_addr);
2073         if (!entry) {
2074                 entry = make_entry(priv, mac_addr);
2075                 if (!entry)
2076                         goto out;
2077                 entry->status = ESI_UNKNOWN;
2078                 lec_arp_add(priv, entry);
2079                 /* Temporary, changes before end of function */
2080         }
2081         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2082         del_timer(&entry->timer);
2083         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2084                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2085                         if (entry != tmp &&
2086                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2087                                 /* Vcc to this host exists */
2088                                 if (tmp->status > ESI_VC_PENDING) {
2089                                         /*
2090                                          * ESI_FLUSH_PENDING,
2091                                          * ESI_FORWARD_DIRECT
2092                                          */
2093                                         entry->vcc = tmp->vcc;
2094                                         entry->old_push = tmp->old_push;
2095                                 }
2096                                 entry->status = tmp->status;
2097                                 break;
2098                         }
2099                 }
2100         }
2101         if (remoteflag)
2102                 entry->flags |= LEC_REMOTE_FLAG;
2103         else
2104                 entry->flags &= ~LEC_REMOTE_FLAG;
2105         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2106                 entry->status = ESI_VC_PENDING;
2107                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2108         }
2109         pr_debug("After update2\n");
2110         dump_arp_table(priv);
2111 out:
2112         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2113 }
2114
2115 /*
2116  * Notifies: Vcc setup ready
2117  */
2118 static void
2119 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2120               struct atm_vcc *vcc,
2121               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2122 {
2123         unsigned long flags;
2124         struct hlist_node *node;
2125         struct lec_arp_table *entry;
2126         int i, found_entry = 0;
2127
2128         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2129         if (ioc_data->receive == 2) {
2130                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2131
2132                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2133 #if 0
2134                 entry = lec_arp_find(priv, bus_mac);
2135                 if (!entry) {
2136                         printk("LEC_ARP: Multicast entry not found!\n");
2137                         goto out;
2138                 }
2139                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2140                 entry->recv_vcc = vcc;
2141                 entry->old_recv_push = old_push;
2142 #endif
2143                 entry = make_entry(priv, bus_mac);
2144                 if (entry == NULL)
2145                         goto out;
2146                 del_timer(&entry->timer);
2147                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2148                 entry->recv_vcc = vcc;
2149                 entry->old_recv_push = old_push;
2150                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2151                 goto out;
2152         } else if (ioc_data->receive == 1) {
2153                 /*
2154                  * Vcc which we don't want to make default vcc,
2155                  * attach it anyway.
2156                  */
2157                 pr_debug
2158                     ("LEC_ARP:Attaching data direct, not default: "
2159                      "%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",
2160                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2161                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2162                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2163                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2164                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2165                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2166                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2167                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2168                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2169                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2170                 entry = make_entry(priv, bus_mac);
2171                 if (entry == NULL)
2172                         goto out;
2173                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2174                 memset(entry->mac_addr, 0, ETH_ALEN);
2175                 entry->recv_vcc = vcc;
2176                 entry->old_recv_push = old_push;
2177                 entry->status = ESI_UNKNOWN;
2178                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2179                 entry->timer.function = lec_arp_expire_vcc;
2180                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2181                 add_timer(&entry->timer);
2182                 dump_arp_table(priv);
2183                 goto out;
2184         }
2185         pr_debug
2186             ("LEC_ARP:Attaching data direct, default: "
2187              "%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",
2188              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2189              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2190              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2191              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2192              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2193              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2194              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2195              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2196              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2197              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2198         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2199                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2200                         if (memcmp
2201                             (ioc_data->atm_addr, entry->atm_addr,
2202                              ATM_ESA_LEN) == 0) {
2203                                 pr_debug("LEC_ARP: Attaching data direct\n");
2204                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2205                                         entry->vcc ? entry->vcc->vci : 0,
2206                                         entry->recv_vcc ? entry->recv_vcc->
2207                                         vci : 0);
2208                                 found_entry = 1;
2209                                 del_timer(&entry->timer);
2210                                 entry->vcc = vcc;
2211                                 entry->old_push = old_push;
2212                                 if (entry->status == ESI_VC_PENDING) {
2213                                         if (priv->maximum_unknown_frame_count
2214                                             == 0)
2215                                                 entry->status =
2216                                                     ESI_FORWARD_DIRECT;
2217                                         else {
2218                                                 entry->timestamp = jiffies;
2219                                                 entry->status =
2220                                                     ESI_FLUSH_PENDING;
2221 #if 0
2222                                                 send_to_lecd(priv, l_flush_xmt,
2223                                                              NULL,
2224                                                              entry->atm_addr,
2225                                                              NULL);
2226 #endif
2227                                         }
2228                                 } else {
2229                                         /*
2230                                          * They were forming a connection
2231                                          * to us, and we to them. Our
2232                                          * ATM address is numerically lower
2233                                          * than theirs, so we make connection
2234                                          * we formed into default VCC (8.1.11).
2235                                          * Connection they made gets torn
2236                                          * down. This might confuse some
2237                                          * clients. Can be changed if
2238                                          * someone reports trouble...
2239                                          */
2240                                         ;
2241                                 }
2242                         }
2243                 }
2244         }
2245         if (found_entry) {
2246                 pr_debug("After vcc was added\n");
2247                 dump_arp_table(priv);
2248                 goto out;
2249         }
2250         /*
2251          * Not found, snatch address from first data packet that arrives
2252          * from this vcc
2253          */
2254         entry = make_entry(priv, bus_mac);
2255         if (!entry)
2256                 goto out;
2257         entry->vcc = vcc;
2258         entry->old_push = old_push;
2259         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2260         memset(entry->mac_addr, 0, ETH_ALEN);
2261         entry->status = ESI_UNKNOWN;
2262         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2263         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2264         entry->timer.function = lec_arp_expire_vcc;
2265         add_timer(&entry->timer);
2266         pr_debug("After vcc was added\n");
2267         dump_arp_table(priv);
2268 out:
2269         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270 }
2271
2272 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2273 {
2274         unsigned long flags;
2275         struct hlist_node *node;
2276         struct lec_arp_table *entry;
2277         int i;
2278
2279         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2280 restart:
2281         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2282         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2283                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2284                         if (entry->flush_tran_id == tran_id
2285                             && entry->status == ESI_FLUSH_PENDING) {
2286                                 struct sk_buff *skb;
2287                                 struct atm_vcc *vcc = entry->vcc;
2288
2289                                 lec_arp_hold(entry);
2290                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2291                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2292                                         lec_send(vcc, skb);
2293                                 entry->last_used = jiffies;
2294                                 entry->status = ESI_FORWARD_DIRECT;
2295                                 lec_arp_put(entry);
2296                                 pr_debug("LEC_ARP: Flushed\n");
2297                                 goto restart;
2298                         }
2299                 }
2300         }
2301         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2302         dump_arp_table(priv);
2303 }
2304
2305 static void
2306 lec_set_flush_tran_id(struct lec_priv *priv,
2307                       const unsigned char *atm_addr, unsigned long tran_id)
2308 {
2309         unsigned long flags;
2310         struct hlist_node *node;
2311         struct lec_arp_table *entry;
2312         int i;
2313
2314         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2315         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2316                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2317                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2318                                 entry->flush_tran_id = tran_id;
2319                                 pr_debug("Set flush transaction id to %lx for %p\n",
2320                                         tran_id, entry);
2321                         }
2322                 }
2323         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2324 }
2325
2326 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2327 {
2328         unsigned long flags;
2329         unsigned char mac_addr[] = {
2330                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2331         };
2332         struct lec_arp_table *to_add;
2333         struct lec_vcc_priv *vpriv;
2334         int err = 0;
2335
2336         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2337                 return -ENOMEM;
2338         vpriv->xoff = 0;
2339         vpriv->old_pop = vcc->pop;
2340         vcc->user_back = vpriv;
2341         vcc->pop = lec_pop;
2342         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2343         to_add = make_entry(priv, mac_addr);
2344         if (!to_add) {
2345                 vcc->pop = vpriv->old_pop;
2346                 kfree(vpriv);
2347                 err = -ENOMEM;
2348                 goto out;
2349         }
2350         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2351         to_add->status = ESI_FORWARD_DIRECT;
2352         to_add->flags |= LEC_PERMANENT_FLAG;
2353         to_add->vcc = vcc;
2354         to_add->old_push = vcc->push;
2355         vcc->push = lec_push;
2356         priv->mcast_vcc = vcc;
2357         lec_arp_add(priv, to_add);
2358 out:
2359         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2360         return err;
2361 }
2362
2363 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2364 {
2365         unsigned long flags;
2366         struct hlist_node *node, *next;
2367         struct lec_arp_table *entry;
2368         int i;
2369
2370         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2371         dump_arp_table(priv);
2372
2373         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2374
2375         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2376                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2377                         if (vcc == entry->vcc) {
2378                                 lec_arp_remove(priv, entry);
2379                                 lec_arp_put(entry);
2380                                 if (priv->mcast_vcc == vcc) {
2381                                         priv->mcast_vcc = NULL;
2382                                 }
2383                         }
2384                 }
2385         }
2386
2387         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2388                 if (entry->vcc == vcc) {
2389                         lec_arp_clear_vccs(entry);
2390                         del_timer(&entry->timer);
2391                         hlist_del(&entry->next);
2392                         lec_arp_put(entry);
2393                 }
2394         }
2395
2396         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2397                 if (entry->recv_vcc == vcc) {
2398                         lec_arp_clear_vccs(entry);
2399                         del_timer(&entry->timer);
2400                         hlist_del(&entry->next);
2401                         lec_arp_put(entry);
2402                 }
2403         }
2404
2405         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2406                 if (entry->recv_vcc == vcc) {
2407                         lec_arp_clear_vccs(entry);
2408                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2409                         hlist_del(&entry->next);
2410                         lec_arp_put(entry);
2411                 }
2412         }
2413
2414         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2415         dump_arp_table(priv);
2416 }
2417
2418 static void
2419 lec_arp_check_empties(struct lec_priv *priv,
2420                       struct atm_vcc *vcc, struct sk_buff *skb)
2421 {
2422         unsigned long flags;
2423         struct hlist_node *node, *next;
2424         struct lec_arp_table *entry, *tmp;
2425         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2426         unsigned char *src;
2427 #ifdef CONFIG_TR
2428         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2429
2430         if (priv->is_trdev)
2431                 src = tr_hdr->h_source;
2432         else
2433 #endif
2434                 src = hdr->h_source;
2435
2436         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2437         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2438                 if (vcc == entry->vcc) {
2439                         del_timer(&entry->timer);
2440                         memcpy(entry->mac_addr, src, ETH_ALEN);
2441                         entry->status = ESI_FORWARD_DIRECT;
2442                         entry->last_used = jiffies;
2443                         /* We might have got an entry */
2444                         if ((tmp = lec_arp_find(priv, src))) {
2445                                 lec_arp_remove(priv, tmp);
2446                                 lec_arp_put(tmp);
2447                         }
2448                         hlist_del(&entry->next);
2449                         lec_arp_add(priv, entry);
2450                         goto out;
2451                 }
2452         }
2453         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2454 out:
2455         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2456 }
2457
2458 MODULE_LICENSE("GPL");