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/proc_fs.h>
  25 #include <linux/seq_file.h>
  26
  27 /* TokenRing if needed */
  28 #ifdef CONFIG_TR
  29 #include <linux/trdevice.h>
  30 #endif
  31
  32 /* And atm device */
  33 #include <linux/atmdev.h>
  34 #include <linux/atmlec.h>
  35
  36 /* Proxy LEC knows about bridging */
  37 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  38 #include <linux/if_bridge.h>
  39 #include "../bridge/br_private.h"
  40
  41 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  42 #endif
  43
  44 /* Modular too */
  45 #include <linux/module.h>
  46 #include <linux/init.h>
  47
  48 #include "lec.h"
  49 #include "lec_arpc.h"
  50 #include "resources.h"
  51
  52 #if 0
  53 #define DPRINTK printk
  54 #else
  55 #define DPRINTK(format,args...)
  56 #endif
  57
  58 #define DUMP_PACKETS 0          /*
  59                                  * 0 = None,
  60                                  * 1 = 30 first bytes
  61                                  * 2 = Whole packet
  62                                  */
  63
  64 #define LEC_UNRES_QUE_LEN 8     /*
  65                                  * number of tx packets to queue for a
  66                                  * single destination while waiting for SVC
  67                                  */
  68
  69 static int lec_open(struct net_device *dev);
  70 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
  71 static int lec_close(struct net_device *dev);
  72 static struct net_device_stats *lec_get_stats(struct net_device *dev);
  73 static void lec_init(struct net_device *dev);
  74 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  75                                           unsigned char *mac_addr);
  76 static int lec_arp_remove(struct lec_priv *priv,
  77                           struct lec_arp_table *to_remove);
  78 /* LANE2 functions */
  79 static void lane2_associate_ind(struct net_device *dev, u8 *mac_address,
  80                                 u8 *tlvs, u32 sizeoftlvs);
  81 static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
  82                          u8 **tlvs, u32 *sizeoftlvs);
  83 static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
  84                                u8 *tlvs, u32 sizeoftlvs);
  85
  86 static int lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr,
  87                            unsigned long permanent);
  88 static void lec_arp_check_empties(struct lec_priv *priv,
  89                                   struct atm_vcc *vcc, struct sk_buff *skb);
  90 static void lec_arp_destroy(struct lec_priv *priv);
  91 static void lec_arp_init(struct lec_priv *priv);
  92 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  93                                        unsigned char *mac_to_find,
  94                                        int is_rdesc,
  95                                        struct lec_arp_table **ret_entry);
  96 static void lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
  97                            unsigned char *atm_addr, unsigned long remoteflag,
  98                            unsigned int targetless_le_arp);
  99 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
 100 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
 101 static void lec_set_flush_tran_id(struct lec_priv *priv,
 102                                   unsigned char *atm_addr,
 103                                   unsigned long tran_id);
 104 static void lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data,
 105                           struct atm_vcc *vcc,
 106                           void (*old_push) (struct atm_vcc *vcc,
 107                                             struct sk_buff *skb));
 108 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 109
 110 /* must be done under lec_arp_lock */
 111 static inline void lec_arp_hold(struct lec_arp_table *entry)
 112 {
 113         atomic_inc(&entry->usage);
 114 }
 115
 116 static inline void lec_arp_put(struct lec_arp_table *entry)
 117 {
 118         if (atomic_dec_and_test(&entry->usage))
 119                 kfree(entry);
 120 }
 121
 122
 123 static struct lane2_ops lane2_ops = {
 124         lane2_resolve,          /* resolve,             spec 3.1.3 */
 125         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 126         NULL                    /* associate indicator, spec 3.1.5 */
 127 };
 128
 129 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 130
 131 /* Device structures */
 132 static struct net_device *dev_lec[MAX_LEC_ITF];
 133
 134 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 135 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 136 {
 137         struct ethhdr *eth;
 138         char *buff;
 139         struct lec_priv *priv;
 140
 141         /*
 142          * Check if this is a BPDU. If so, ask zeppelin to send
 143          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 144          * as the Config BPDU has
 145          */
 146         eth = (struct ethhdr *)skb->data;
 147         buff = skb->data + skb->dev->hard_header_len;
 148         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 149                 struct sock *sk;
 150                 struct sk_buff *skb2;
 151                 struct atmlec_msg *mesg;
 152
 153                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 154                 if (skb2 == NULL)
 155                         return;
 156                 skb2->len = sizeof(struct atmlec_msg);
 157                 mesg = (struct atmlec_msg *)skb2->data;
 158                 mesg->type = l_topology_change;
 159                 buff += 4;
 160                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 161
 162                 priv = (struct lec_priv *)dev->priv;
 163                 atm_force_charge(priv->lecd, skb2->truesize);
 164                 sk = sk_atm(priv->lecd);
 165                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 166                 sk->sk_data_ready(sk, skb2->len);
 167         }
 168
 169         return;
 170 }
 171 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 172
 173 /*
 174  * Modelled after tr_type_trans
 175  * All multicast and ARE or STE frames go to BUS.
 176  * Non source routed frames go by destination address.
 177  * Last hop source routed frames go by destination address.
 178  * Not last hop source routed frames go by _next_ route descriptor.
 179  * Returns pointer to destination MAC address or fills in rdesc
 180  * and returns NULL.
 181  */
 182 #ifdef CONFIG_TR
 183 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 184 {
 185         struct trh_hdr *trh;
 186         int riflen, num_rdsc;
 187
 188         trh = (struct trh_hdr *)packet;
 189         if (trh->daddr[0] & (uint8_t) 0x80)
 190                 return bus_mac; /* multicast */
 191
 192         if (trh->saddr[0] & TR_RII) {
 193                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 194                 if ((ntohs(trh->rcf) >> 13) != 0)
 195                         return bus_mac; /* ARE or STE */
 196         } else
 197                 return trh->daddr;      /* not source routed */
 198
 199         if (riflen < 6)
 200                 return trh->daddr;      /* last hop, source routed */
 201
 202         /* riflen is 6 or more, packet has more than one route descriptor */
 203         num_rdsc = (riflen / 2) - 1;
 204         memset(rdesc, 0, ETH_ALEN);
 205         /* offset 4 comes from LAN destination field in LE control frames */
 206         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 207                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 208         else {
 209                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 210                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 211         }
 212
 213         return NULL;
 214 }
 215 #endif /* CONFIG_TR */
 216
 217 /*
 218  * Open/initialize the netdevice. This is called (in the current kernel)
 219  * sometime after booting when the 'ifconfig' program is run.
 220  *
 221  * This routine should set everything up anew at each open, even
 222  * registers that "should" only need to be set once at boot, so that
 223  * there is non-reboot way to recover if something goes wrong.
 224  */
 225
 226 static int lec_open(struct net_device *dev)
 227 {
 228         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 229
 230         netif_start_queue(dev);
 231         memset(&priv->stats, 0, sizeof(struct net_device_stats));
 232
 233         return 0;
 234 }
 235
 236 static __inline__ void
 237 lec_send(struct atm_vcc *vcc, struct sk_buff *skb, struct lec_priv *priv)
 238 {
 239         ATM_SKB(skb)->vcc = vcc;
 240         ATM_SKB(skb)->atm_options = vcc->atm_options;
 241
 242         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 243         if (vcc->send(vcc, skb) < 0) {
 244                 priv->stats.tx_dropped++;
 245                 return;
 246         }
 247
 248         priv->stats.tx_packets++;
 249         priv->stats.tx_bytes += skb->len;
 250 }
 251
 252 static void lec_tx_timeout(struct net_device *dev)
 253 {
 254         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 255         dev->trans_start = jiffies;
 256         netif_wake_queue(dev);
 257 }
 258
 259 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 260 {
 261         struct sk_buff *skb2;
 262         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 263         struct lecdatahdr_8023 *lec_h;
 264         struct atm_vcc *vcc;
 265         struct lec_arp_table *entry;
 266         unsigned char *dst;
 267         int min_frame_size;
 268 #ifdef CONFIG_TR
 269         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 270 #endif
 271         int is_rdesc;
 272 #if DUMP_PACKETS > 0
 273         char buf[300];
 274         int i = 0;
 275 #endif /* DUMP_PACKETS >0 */
 276
 277         DPRINTK("lec_start_xmit called\n");
 278         if (!priv->lecd) {
 279                 printk("%s:No lecd attached\n", dev->name);
 280                 priv->stats.tx_errors++;
 281                 netif_stop_queue(dev);
 282                 return -EUNATCH;
 283         }
 284
 285         DPRINTK("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 286                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 287                 (long)skb_end_pointer(skb));
 288 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 289         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 290                 lec_handle_bridge(skb, dev);
 291 #endif
 292
 293         /* Make sure we have room for lec_id */
 294         if (skb_headroom(skb) < 2) {
 295
 296                 DPRINTK("lec_start_xmit: reallocating skb\n");
 297                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 298                 kfree_skb(skb);
 299                 if (skb2 == NULL)
 300                         return 0;
 301                 skb = skb2;
 302         }
 303         skb_push(skb, 2);
 304
 305         /* Put le header to place, works for TokenRing too */
 306         lec_h = (struct lecdatahdr_8023 *)skb->data;
 307         lec_h->le_header = htons(priv->lecid);
 308
 309 #ifdef CONFIG_TR
 310         /*
 311          * Ugly. Use this to realign Token Ring packets for
 312          * e.g. PCA-200E driver.
 313          */
 314         if (priv->is_trdev) {
 315                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 316                 kfree_skb(skb);
 317                 if (skb2 == NULL)
 318                         return 0;
 319                 skb = skb2;
 320         }
 321 #endif
 322
 323 #if DUMP_PACKETS > 0
 324         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 325                skb->len, priv->lecid);
 326 #if DUMP_PACKETS >= 2
 327         for (i = 0; i < skb->len && i < 99; i++) {
 328                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 329         }
 330 #elif DUMP_PACKETS >= 1
 331         for (i = 0; i < skb->len && i < 30; i++) {
 332                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 333         }
 334 #endif /* DUMP_PACKETS >= 1 */
 335         if (i == skb->len)
 336                 printk("%s\n", buf);
 337         else
 338                 printk("%s...\n", buf);
 339 #endif /* DUMP_PACKETS > 0 */
 340
 341         /* Minimum ethernet-frame size */
 342 #ifdef CONFIG_TR
 343         if (priv->is_trdev)
 344                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 345         else
 346 #endif
 347                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 348         if (skb->len < min_frame_size) {
 349                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 350                         skb2 = skb_copy_expand(skb, 0,
 351                                                min_frame_size - skb->truesize,
 352                                                GFP_ATOMIC);
 353                         dev_kfree_skb(skb);
 354                         if (skb2 == NULL) {
 355                                 priv->stats.tx_dropped++;
 356                                 return 0;
 357                         }
 358                         skb = skb2;
 359                 }
 360                 skb_put(skb, min_frame_size - skb->len);
 361         }
 362
 363         /* Send to right vcc */
 364         is_rdesc = 0;
 365         dst = lec_h->h_dest;
 366 #ifdef CONFIG_TR
 367         if (priv->is_trdev) {
 368                 dst = get_tr_dst(skb->data + 2, rdesc);
 369                 if (dst == NULL) {
 370                         dst = rdesc;
 371                         is_rdesc = 1;
 372                 }
 373         }
 374 #endif
 375         entry = NULL;
 376         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 377         DPRINTK("%s:vcc:%p vcc_flags:%x, entry:%p\n", dev->name,
 378                 vcc, vcc ? vcc->flags : 0, entry);
 379         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 380                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 381                         DPRINTK("%s:lec_start_xmit: queuing packet, ",
 382                                 dev->name);
 383                         DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n",
 384                                 lec_h->h_dest[0], lec_h->h_dest[1],
 385                                 lec_h->h_dest[2], lec_h->h_dest[3],
 386                                 lec_h->h_dest[4], lec_h->h_dest[5]);
 387                         skb_queue_tail(&entry->tx_wait, skb);
 388                 } else {
 389                         DPRINTK
 390                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 391                              dev->name);
 392                         DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n",
 393                                 lec_h->h_dest[0], lec_h->h_dest[1],
 394                                 lec_h->h_dest[2], lec_h->h_dest[3],
 395                                 lec_h->h_dest[4], lec_h->h_dest[5]);
 396                         priv->stats.tx_dropped++;
 397                         dev_kfree_skb(skb);
 398                 }
 399                 goto out;
 400         }
 401 #if DUMP_PACKETS > 0
 402         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 403 #endif /* DUMP_PACKETS > 0 */
 404
 405         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 406                 DPRINTK("lec.c: emptying tx queue, ");
 407                 DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n",
 408                         lec_h->h_dest[0], lec_h->h_dest[1], lec_h->h_dest[2],
 409                         lec_h->h_dest[3], lec_h->h_dest[4], lec_h->h_dest[5]);
 410                 lec_send(vcc, skb2, priv);
 411         }
 412
 413         lec_send(vcc, skb, priv);
 414
 415         if (!atm_may_send(vcc, 0)) {
 416                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 417
 418                 vpriv->xoff = 1;
 419                 netif_stop_queue(dev);
 420
 421                 /*
 422                  * vcc->pop() might have occurred in between, making
 423                  * the vcc usuable again.  Since xmit is serialized,
 424                  * this is the only situation we have to re-test.
 425                  */
 426
 427                 if (atm_may_send(vcc, 0))
 428                         netif_wake_queue(dev);
 429         }
 430
 431 out:
 432         if (entry)
 433                 lec_arp_put(entry);
 434         dev->trans_start = jiffies;
 435         return 0;
 436 }
 437
 438 /* The inverse routine to net_open(). */
 439 static int lec_close(struct net_device *dev)
 440 {
 441         netif_stop_queue(dev);
 442         return 0;
 443 }
 444
 445 /*
 446  * Get the current statistics.
 447  * This may be called with the card open or closed.
 448  */
 449 static struct net_device_stats *lec_get_stats(struct net_device *dev)
 450 {
 451         return &((struct lec_priv *)dev->priv)->stats;
 452 }
 453
 454 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 455 {
 456         unsigned long flags;
 457         struct net_device *dev = (struct net_device *)vcc->proto_data;
 458         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 459         struct atmlec_msg *mesg;
 460         struct lec_arp_table *entry;
 461         int i;
 462         char *tmp;              /* FIXME */
 463
 464         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 465         mesg = (struct atmlec_msg *)skb->data;
 466         tmp = skb->data;
 467         tmp += sizeof(struct atmlec_msg);
 468         DPRINTK("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 469         switch (mesg->type) {
 470         case l_set_mac_addr:
 471                 for (i = 0; i < 6; i++) {
 472                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 473                 }
 474                 break;
 475         case l_del_mac_addr:
 476                 for (i = 0; i < 6; i++) {
 477                         dev->dev_addr[i] = 0;
 478                 }
 479                 break;
 480         case l_addr_delete:
 481                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 482                                 mesg->content.normal.flag);
 483                 break;
 484         case l_topology_change:
 485                 priv->topology_change = mesg->content.normal.flag;
 486                 break;
 487         case l_flush_complete:
 488                 lec_flush_complete(priv, mesg->content.normal.flag);
 489                 break;
 490         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 491                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 492                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 493                 lec_arp_remove(priv, entry);
 494                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 495
 496                 if (mesg->content.normal.no_source_le_narp)
 497                         break;
 498                 /* FALL THROUGH */
 499         case l_arp_update:
 500                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 501                                mesg->content.normal.atm_addr,
 502                                mesg->content.normal.flag,
 503                                mesg->content.normal.targetless_le_arp);
 504                 DPRINTK("lec: in l_arp_update\n");
 505                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 506                         DPRINTK("lec: LANE2 3.1.5, got tlvs, size %d\n",
 507                                 mesg->sizeoftlvs);
 508                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 509                                             tmp, mesg->sizeoftlvs);
 510                 }
 511                 break;
 512         case l_config:
 513                 priv->maximum_unknown_frame_count =
 514                     mesg->content.config.maximum_unknown_frame_count;
 515                 priv->max_unknown_frame_time =
 516                     (mesg->content.config.max_unknown_frame_time * HZ);
 517                 priv->max_retry_count = mesg->content.config.max_retry_count;
 518                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 519                 priv->forward_delay_time =
 520                     (mesg->content.config.forward_delay_time * HZ);
 521                 priv->arp_response_time =
 522                     (mesg->content.config.arp_response_time * HZ);
 523                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 524                 priv->path_switching_delay =
 525                     (mesg->content.config.path_switching_delay * HZ);
 526                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 527                 priv->lane2_ops = NULL;
 528                 if (priv->lane_version > 1)
 529                         priv->lane2_ops = &lane2_ops;
 530                 if (dev->change_mtu(dev, mesg->content.config.mtu))
 531                         printk("%s: change_mtu to %d failed\n", dev->name,
 532                                mesg->content.config.mtu);
 533                 priv->is_proxy = mesg->content.config.is_proxy;
 534                 break;
 535         case l_flush_tran_id:
 536                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 537                                       mesg->content.normal.flag);
 538                 break;
 539         case l_set_lecid:
 540                 priv->lecid =
 541                     (unsigned short)(0xffff & mesg->content.normal.flag);
 542                 break;
 543         case l_should_bridge:
 544 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 545                 {
 546                         struct net_bridge_fdb_entry *f;
 547
 548                         DPRINTK
 549                             ("%s: bridge zeppelin asks about 0x%02x:%02x:%02x:%02x:%02x:%02x\n",
 550                              dev->name, mesg->content.proxy.mac_addr[0],
 551                              mesg->content.proxy.mac_addr[1],
 552                              mesg->content.proxy.mac_addr[2],
 553                              mesg->content.proxy.mac_addr[3],
 554                              mesg->content.proxy.mac_addr[4],
 555                              mesg->content.proxy.mac_addr[5]);
 556
 557                         if (br_fdb_get_hook == NULL || dev->br_port == NULL)
 558                                 break;
 559
 560                         f = br_fdb_get_hook(dev->br_port->br,
 561                                             mesg->content.proxy.mac_addr);
 562                         if (f != NULL && f->dst->dev != dev
 563                             && f->dst->state == BR_STATE_FORWARDING) {
 564                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 565                                 struct sk_buff *skb2;
 566                                 struct sock *sk;
 567
 568                                 DPRINTK
 569                                     ("%s: entry found, responding to zeppelin\n",
 570                                      dev->name);
 571                                 skb2 =
 572                                     alloc_skb(sizeof(struct atmlec_msg),
 573                                               GFP_ATOMIC);
 574                                 if (skb2 == NULL) {
 575                                         br_fdb_put_hook(f);
 576                                         break;
 577                                 }
 578                                 skb2->len = sizeof(struct atmlec_msg);
 579                                 skb_copy_to_linear_data(skb2, mesg,
 580                                                         sizeof(*mesg));
 581                                 atm_force_charge(priv->lecd, skb2->truesize);
 582                                 sk = sk_atm(priv->lecd);
 583                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 584                                 sk->sk_data_ready(sk, skb2->len);
 585                         }
 586                         if (f != NULL)
 587                                 br_fdb_put_hook(f);
 588                 }
 589 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 590                 break;
 591         default:
 592                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 593                 dev_kfree_skb(skb);
 594                 return -EINVAL;
 595         }
 596         dev_kfree_skb(skb);
 597         return 0;
 598 }
 599
 600 static void lec_atm_close(struct atm_vcc *vcc)
 601 {
 602         struct sk_buff *skb;
 603         struct net_device *dev = (struct net_device *)vcc->proto_data;
 604         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 605
 606         priv->lecd = NULL;
 607         /* Do something needful? */
 608
 609         netif_stop_queue(dev);
 610         lec_arp_destroy(priv);
 611
 612         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 613                 printk("%s lec_atm_close: closing with messages pending\n",
 614                        dev->name);
 615         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 616                 atm_return(vcc, skb->truesize);
 617                 dev_kfree_skb(skb);
 618         }
 619
 620         printk("%s: Shut down!\n", dev->name);
 621         module_put(THIS_MODULE);
 622 }
 623
 624 static struct atmdev_ops lecdev_ops = {
 625         .close = lec_atm_close,
 626         .send = lec_atm_send
 627 };
 628
 629 static struct atm_dev lecatm_dev = {
 630         .ops = &lecdev_ops,
 631         .type = "lec",
 632         .number = 999,          /* dummy device number */
 633         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 634 };
 635
 636 /*
 637  * LANE2: new argument struct sk_buff *data contains
 638  * the LE_ARP based TLVs introduced in the LANE2 spec
 639  */
 640 static int
 641 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 642              unsigned char *mac_addr, unsigned char *atm_addr,
 643              struct sk_buff *data)
 644 {
 645         struct sock *sk;
 646         struct sk_buff *skb;
 647         struct atmlec_msg *mesg;
 648
 649         if (!priv || !priv->lecd) {
 650                 return -1;
 651         }
 652         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 653         if (!skb)
 654                 return -1;
 655         skb->len = sizeof(struct atmlec_msg);
 656         mesg = (struct atmlec_msg *)skb->data;
 657         memset(mesg, 0, sizeof(struct atmlec_msg));
 658         mesg->type = type;
 659         if (data != NULL)
 660                 mesg->sizeoftlvs = data->len;
 661         if (mac_addr)
 662                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 663         else
 664                 mesg->content.normal.targetless_le_arp = 1;
 665         if (atm_addr)
 666                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 667
 668         atm_force_charge(priv->lecd, skb->truesize);
 669         sk = sk_atm(priv->lecd);
 670         skb_queue_tail(&sk->sk_receive_queue, skb);
 671         sk->sk_data_ready(sk, skb->len);
 672
 673         if (data != NULL) {
 674                 DPRINTK("lec: about to send %d bytes of data\n", data->len);
 675                 atm_force_charge(priv->lecd, data->truesize);
 676                 skb_queue_tail(&sk->sk_receive_queue, data);
 677                 sk->sk_data_ready(sk, skb->len);
 678         }
 679
 680         return 0;
 681 }
 682
 683 /* shamelessly stolen from drivers/net/net_init.c */
 684 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 685 {
 686         if ((new_mtu < 68) || (new_mtu > 18190))
 687                 return -EINVAL;
 688         dev->mtu = new_mtu;
 689         return 0;
 690 }
 691
 692 static void lec_set_multicast_list(struct net_device *dev)
 693 {
 694         /*
 695          * by default, all multicast frames arrive over the bus.
 696          * eventually support selective multicast service
 697          */
 698         return;
 699 }
 700
 701 static void lec_init(struct net_device *dev)
 702 {
 703         dev->change_mtu = lec_change_mtu;
 704         dev->open = lec_open;
 705         dev->stop = lec_close;
 706         dev->hard_start_xmit = lec_start_xmit;
 707         dev->tx_timeout = lec_tx_timeout;
 708
 709         dev->get_stats = lec_get_stats;
 710         dev->set_multicast_list = lec_set_multicast_list;
 711         dev->do_ioctl = NULL;
 712         printk("%s: Initialized!\n", dev->name);
 713         return;
 714 }
 715
 716 static unsigned char lec_ctrl_magic[] = {
 717         0xff,
 718         0x00,
 719         0x01,
 720         0x01
 721 };
 722
 723 #define LEC_DATA_DIRECT_8023  2
 724 #define LEC_DATA_DIRECT_8025  3
 725
 726 static int lec_is_data_direct(struct atm_vcc *vcc)
 727 {
 728         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 729                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 730 }
 731
 732 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 733 {
 734         unsigned long flags;
 735         struct net_device *dev = (struct net_device *)vcc->proto_data;
 736         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 737
 738 #if DUMP_PACKETS >0
 739         int i = 0;
 740         char buf[300];
 741
 742         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 743                vcc->vpi, vcc->vci);
 744 #endif
 745         if (!skb) {
 746                 DPRINTK("%s: null skb\n", dev->name);
 747                 lec_vcc_close(priv, vcc);
 748                 return;
 749         }
 750 #if DUMP_PACKETS > 0
 751         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 752                skb->len, priv->lecid);
 753 #if DUMP_PACKETS >= 2
 754         for (i = 0; i < skb->len && i < 99; i++) {
 755                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 756         }
 757 #elif DUMP_PACKETS >= 1
 758         for (i = 0; i < skb->len && i < 30; i++) {
 759                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 760         }
 761 #endif /* DUMP_PACKETS >= 1 */
 762         if (i == skb->len)
 763                 printk("%s\n", buf);
 764         else
 765                 printk("%s...\n", buf);
 766 #endif /* DUMP_PACKETS > 0 */
 767         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 768                 struct sock *sk = sk_atm(vcc);
 769
 770                 DPRINTK("%s: To daemon\n", dev->name);
 771                 skb_queue_tail(&sk->sk_receive_queue, skb);
 772                 sk->sk_data_ready(sk, skb->len);
 773         } else {                /* Data frame, queue to protocol handlers */
 774                 struct lec_arp_table *entry;
 775                 unsigned char *src, *dst;
 776
 777                 atm_return(vcc, skb->truesize);
 778                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 779                     !priv->lecd || !(dev->flags & IFF_UP)) {
 780                         /*
 781                          * Probably looping back, or if lecd is missing,
 782                          * lecd has gone down
 783                          */
 784                         DPRINTK("Ignoring frame...\n");
 785                         dev_kfree_skb(skb);
 786                         return;
 787                 }
 788 #ifdef CONFIG_TR
 789                 if (priv->is_trdev)
 790                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 791                 else
 792 #endif
 793                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 794
 795                 /*
 796                  * If this is a Data Direct VCC, and the VCC does not match
 797                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 798                  */
 799                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 800                 if (lec_is_data_direct(vcc)) {
 801 #ifdef CONFIG_TR
 802                         if (priv->is_trdev)
 803                                 src =
 804                                     ((struct lecdatahdr_8025 *)skb->data)->
 805                                     h_source;
 806                         else
 807 #endif
 808                                 src =
 809                                     ((struct lecdatahdr_8023 *)skb->data)->
 810                                     h_source;
 811                         entry = lec_arp_find(priv, src);
 812                         if (entry && entry->vcc != vcc) {
 813                                 lec_arp_remove(priv, entry);
 814                                 lec_arp_put(entry);
 815                         }
 816                 }
 817                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 818
 819                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 820                     !priv->is_proxy &&  /* Proxy wants all the packets */
 821                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 822                         dev_kfree_skb(skb);
 823                         return;
 824                 }
 825                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 826                         lec_arp_check_empties(priv, vcc, skb);
 827                 }
 828                 skb_pull(skb, 2);       /* skip lec_id */
 829 #ifdef CONFIG_TR
 830                 if (priv->is_trdev)
 831                         skb->protocol = tr_type_trans(skb, dev);
 832                 else
 833 #endif
 834                         skb->protocol = eth_type_trans(skb, dev);
 835                 priv->stats.rx_packets++;
 836                 priv->stats.rx_bytes += skb->len;
 837                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 838                 netif_rx(skb);
 839         }
 840 }
 841
 842 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 843 {
 844         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 845         struct net_device *dev = skb->dev;
 846
 847         if (vpriv == NULL) {
 848                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 849                 return;
 850         }
 851
 852         vpriv->old_pop(vcc, skb);
 853
 854         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 855                 vpriv->xoff = 0;
 856                 if (netif_running(dev) && netif_queue_stopped(dev))
 857                         netif_wake_queue(dev);
 858         }
 859 }
 860
 861 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 862 {
 863         struct lec_vcc_priv *vpriv;
 864         int bytes_left;
 865         struct atmlec_ioc ioc_data;
 866
 867         /* Lecd must be up in this case */
 868         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 869         if (bytes_left != 0) {
 870                 printk
 871                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 872                      bytes_left);
 873         }
 874         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 875             !dev_lec[ioc_data.dev_num])
 876                 return -EINVAL;
 877         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 878                 return -ENOMEM;
 879         vpriv->xoff = 0;
 880         vpriv->old_pop = vcc->pop;
 881         vcc->user_back = vpriv;
 882         vcc->pop = lec_pop;
 883         lec_vcc_added(dev_lec[ioc_data.dev_num]->priv,
 884                       &ioc_data, vcc, vcc->push);
 885         vcc->proto_data = dev_lec[ioc_data.dev_num];
 886         vcc->push = lec_push;
 887         return 0;
 888 }
 889
 890 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 891 {
 892         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 893                 return -EINVAL;
 894         vcc->proto_data = dev_lec[arg];
 895         return (lec_mcast_make((struct lec_priv *)dev_lec[arg]->priv, vcc));
 896 }
 897
 898 /* Initialize device. */
 899 static int lecd_attach(struct atm_vcc *vcc, int arg)
 900 {
 901         int i;
 902         struct lec_priv *priv;
 903
 904         if (arg < 0)
 905                 i = 0;
 906         else
 907                 i = arg;
 908 #ifdef CONFIG_TR
 909         if (arg >= MAX_LEC_ITF)
 910                 return -EINVAL;
 911 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 912         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 913                 return -EINVAL;
 914 #endif
 915         if (!dev_lec[i]) {
 916                 int is_trdev, size;
 917
 918                 is_trdev = 0;
 919                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 920                         is_trdev = 1;
 921
 922                 size = sizeof(struct lec_priv);
 923 #ifdef CONFIG_TR
 924                 if (is_trdev)
 925                         dev_lec[i] = alloc_trdev(size);
 926                 else
 927 #endif
 928                         dev_lec[i] = alloc_etherdev(size);
 929                 if (!dev_lec[i])
 930                         return -ENOMEM;
 931                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 932                 if (register_netdev(dev_lec[i])) {
 933                         free_netdev(dev_lec[i]);
 934                         return -EINVAL;
 935                 }
 936
 937                 priv = dev_lec[i]->priv;
 938                 priv->is_trdev = is_trdev;
 939                 lec_init(dev_lec[i]);
 940         } else {
 941                 priv = dev_lec[i]->priv;
 942                 if (priv->lecd)
 943                         return -EADDRINUSE;
 944         }
 945         lec_arp_init(priv);
 946         priv->itfnum = i;       /* LANE2 addition */
 947         priv->lecd = vcc;
 948         vcc->dev = &lecatm_dev;
 949         vcc_insert_socket(sk_atm(vcc));
 950
 951         vcc->proto_data = dev_lec[i];
 952         set_bit(ATM_VF_META, &vcc->flags);
 953         set_bit(ATM_VF_READY, &vcc->flags);
 954
 955         /* Set default values to these variables */
 956         priv->maximum_unknown_frame_count = 1;
 957         priv->max_unknown_frame_time = (1 * HZ);
 958         priv->vcc_timeout_period = (1200 * HZ);
 959         priv->max_retry_count = 1;
 960         priv->aging_time = (300 * HZ);
 961         priv->forward_delay_time = (15 * HZ);
 962         priv->topology_change = 0;
 963         priv->arp_response_time = (1 * HZ);
 964         priv->flush_timeout = (4 * HZ);
 965         priv->path_switching_delay = (6 * HZ);
 966
 967         if (dev_lec[i]->flags & IFF_UP) {
 968                 netif_start_queue(dev_lec[i]);
 969         }
 970         __module_get(THIS_MODULE);
 971         return i;
 972 }
 973
 974 #ifdef CONFIG_PROC_FS
 975 static char *lec_arp_get_status_string(unsigned char status)
 976 {
 977         static char *lec_arp_status_string[] = {
 978                 "ESI_UNKNOWN       ",
 979                 "ESI_ARP_PENDING   ",
 980                 "ESI_VC_PENDING    ",
 981                 "<Undefined>       ",
 982                 "ESI_FLUSH_PENDING ",
 983                 "ESI_FORWARD_DIRECT"
 984         };
 985
 986         if (status > ESI_FORWARD_DIRECT)
 987                 status = 3;     /* ESI_UNDEFINED */
 988         return lec_arp_status_string[status];
 989 }
 990
 991 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 992 {
 993         int i;
 994
 995         for (i = 0; i < ETH_ALEN; i++)
 996                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 997         seq_printf(seq, " ");
 998         for (i = 0; i < ATM_ESA_LEN; i++)
 999                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
1000         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
1001                    entry->flags & 0xffff);
1002         if (entry->vcc)
1003                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
1004         else
1005                 seq_printf(seq, "        ");
1006         if (entry->recv_vcc) {
1007                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
1008                            entry->recv_vcc->vci);
1009         }
1010         seq_putc(seq, '\n');
1011 }
1012
1013 struct lec_state {
1014         unsigned long flags;
1015         struct lec_priv *locked;
1016         struct hlist_node *node;
1017         struct net_device *dev;
1018         int itf;
1019         int arp_table;
1020         int misc_table;
1021 };
1022
1023 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
1024                           loff_t *l)
1025 {
1026         struct hlist_node *e = state->node;
1027         struct lec_arp_table *tmp;
1028
1029         if (!e)
1030                 e = tbl->first;
1031         if (e == (void *)1) {
1032                 e = tbl->first;
1033                 --*l;
1034         }
1035
1036         hlist_for_each_entry_from(tmp, e, next) {
1037                 if (--*l < 0)
1038                         break;
1039         }
1040         state->node = e;
1041
1042         return (*l < 0) ? state : NULL;
1043 }
1044
1045 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1046                           struct lec_priv *priv)
1047 {
1048         void *v = NULL;
1049         int p;
1050
1051         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1052                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1053                 if (v)
1054                         break;
1055         }
1056         state->arp_table = p;
1057         return v;
1058 }
1059
1060 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1061                            struct lec_priv *priv)
1062 {
1063         struct hlist_head *lec_misc_tables[] = {
1064                 &priv->lec_arp_empty_ones,
1065                 &priv->lec_no_forward,
1066                 &priv->mcast_fwds
1067         };
1068         void *v = NULL;
1069         int q;
1070
1071         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1072                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1073                 if (v)
1074                         break;
1075         }
1076         state->misc_table = q;
1077         return v;
1078 }
1079
1080 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1081                            struct lec_priv *priv)
1082 {
1083         if (!state->locked) {
1084                 state->locked = priv;
1085                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1086         }
1087         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1088                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1089                 state->locked = NULL;
1090                 /* Partial state reset for the next time we get called */
1091                 state->arp_table = state->misc_table = 0;
1092         }
1093         return state->locked;
1094 }
1095
1096 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1097 {
1098         struct net_device *dev;
1099         void *v;
1100
1101         dev = state->dev ? state->dev : dev_lec[state->itf];
1102         v = (dev && dev->priv) ? lec_priv_walk(state, l, dev->priv) : NULL;
1103         if (!v && dev) {
1104                 dev_put(dev);
1105                 /* Partial state reset for the next time we get called */
1106                 dev = NULL;
1107         }
1108         state->dev = dev;
1109         return v;
1110 }
1111
1112 static void *lec_get_idx(struct lec_state *state, loff_t l)
1113 {
1114         void *v = NULL;
1115
1116         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1117                 v = lec_itf_walk(state, &l);
1118                 if (v)
1119                         break;
1120         }
1121         return v;
1122 }
1123
1124 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1125 {
1126         struct lec_state *state = seq->private;
1127
1128         state->itf = 0;
1129         state->dev = NULL;
1130         state->locked = NULL;
1131         state->arp_table = 0;
1132         state->misc_table = 0;
1133         state->node = (void *)1;
1134
1135         return *pos ? lec_get_idx(state, *pos) : (void *)1;
1136 }
1137
1138 static void lec_seq_stop(struct seq_file *seq, void *v)
1139 {
1140         struct lec_state *state = seq->private;
1141
1142         if (state->dev) {
1143                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1144                                        state->flags);
1145                 dev_put(state->dev);
1146         }
1147 }
1148
1149 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1150 {
1151         struct lec_state *state = seq->private;
1152
1153         v = lec_get_idx(state, 1);
1154         *pos += !!PTR_ERR(v);
1155         return v;
1156 }
1157
1158 static int lec_seq_show(struct seq_file *seq, void *v)
1159 {
1160         static char lec_banner[] = "Itf  MAC          ATM destination"
1161             "                          Status            Flags "
1162             "VPI/VCI Recv VPI/VCI\n";
1163
1164         if (v == (void *)1)
1165                 seq_puts(seq, lec_banner);
1166         else {
1167                 struct lec_state *state = seq->private;
1168                 struct net_device *dev = state->dev;
1169                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1170
1171                 seq_printf(seq, "%s ", dev->name);
1172                 lec_info(seq, entry);
1173         }
1174         return 0;
1175 }
1176
1177 static const struct seq_operations lec_seq_ops = {
1178         .start = lec_seq_start,
1179         .next = lec_seq_next,
1180         .stop = lec_seq_stop,
1181         .show = lec_seq_show,
1182 };
1183
1184 static int lec_seq_open(struct inode *inode, struct file *file)
1185 {
1186         struct lec_state *state;
1187         struct seq_file *seq;
1188         int rc = -EAGAIN;
1189
1190         state = kmalloc(sizeof(*state), GFP_KERNEL);
1191         if (!state) {
1192                 rc = -ENOMEM;
1193                 goto out;
1194         }
1195
1196         rc = seq_open(file, &lec_seq_ops);
1197         if (rc)
1198                 goto out_kfree;
1199         seq = file->private_data;
1200         seq->private = state;
1201 out:
1202         return rc;
1203
1204 out_kfree:
1205         kfree(state);
1206         goto out;
1207 }
1208
1209 static int lec_seq_release(struct inode *inode, struct file *file)
1210 {
1211         return seq_release_private(inode, file);
1212 }
1213
1214 static const struct file_operations lec_seq_fops = {
1215         .owner = THIS_MODULE,
1216         .open = lec_seq_open,
1217         .read = seq_read,
1218         .llseek = seq_lseek,
1219         .release = lec_seq_release,
1220 };
1221 #endif
1222
1223 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1224 {
1225         struct atm_vcc *vcc = ATM_SD(sock);
1226         int err = 0;
1227
1228         switch (cmd) {
1229         case ATMLEC_CTRL:
1230         case ATMLEC_MCAST:
1231         case ATMLEC_DATA:
1232                 if (!capable(CAP_NET_ADMIN))
1233                         return -EPERM;
1234                 break;
1235         default:
1236                 return -ENOIOCTLCMD;
1237         }
1238
1239         switch (cmd) {
1240         case ATMLEC_CTRL:
1241                 err = lecd_attach(vcc, (int)arg);
1242                 if (err >= 0)
1243                         sock->state = SS_CONNECTED;
1244                 break;
1245         case ATMLEC_MCAST:
1246                 err = lec_mcast_attach(vcc, (int)arg);
1247                 break;
1248         case ATMLEC_DATA:
1249                 err = lec_vcc_attach(vcc, (void __user *)arg);
1250                 break;
1251         }
1252
1253         return err;
1254 }
1255
1256 static struct atm_ioctl lane_ioctl_ops = {
1257         .owner = THIS_MODULE,
1258         .ioctl = lane_ioctl,
1259 };
1260
1261 static int __init lane_module_init(void)
1262 {
1263 #ifdef CONFIG_PROC_FS
1264         struct proc_dir_entry *p;
1265
1266         p = create_proc_entry("lec", S_IRUGO, atm_proc_root);
1267         if (p)
1268                 p->proc_fops = &lec_seq_fops;
1269 #endif
1270
1271         register_atm_ioctl(&lane_ioctl_ops);
1272         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1273         return 0;
1274 }
1275
1276 static void __exit lane_module_cleanup(void)
1277 {
1278         int i;
1279         struct lec_priv *priv;
1280
1281         remove_proc_entry("lec", atm_proc_root);
1282
1283         deregister_atm_ioctl(&lane_ioctl_ops);
1284
1285         for (i = 0; i < MAX_LEC_ITF; i++) {
1286                 if (dev_lec[i] != NULL) {
1287                         priv = (struct lec_priv *)dev_lec[i]->priv;
1288                         unregister_netdev(dev_lec[i]);
1289                         free_netdev(dev_lec[i]);
1290                         dev_lec[i] = NULL;
1291                 }
1292         }
1293
1294         return;
1295 }
1296
1297 module_init(lane_module_init);
1298 module_exit(lane_module_cleanup);
1299
1300 /*
1301  * LANE2: 3.1.3, LE_RESOLVE.request
1302  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1303  * If sizeoftlvs == NULL the default TLVs associated with with this
1304  * lec will be used.
1305  * If dst_mac == NULL, targetless LE_ARP will be sent
1306  */
1307 static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
1308                          u8 **tlvs, u32 *sizeoftlvs)
1309 {
1310         unsigned long flags;
1311         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1312         struct lec_arp_table *table;
1313         struct sk_buff *skb;
1314         int retval;
1315
1316         if (force == 0) {
1317                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1318                 table = lec_arp_find(priv, dst_mac);
1319                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1320                 if (table == NULL)
1321                         return -1;
1322
1323                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1324                 if (*tlvs == NULL)
1325                         return -1;
1326
1327                 *sizeoftlvs = table->sizeoftlvs;
1328
1329                 return 0;
1330         }
1331
1332         if (sizeoftlvs == NULL)
1333                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1334
1335         else {
1336                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1337                 if (skb == NULL)
1338                         return -1;
1339                 skb->len = *sizeoftlvs;
1340                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1341                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1342         }
1343         return retval;
1344 }
1345
1346 /*
1347  * LANE2: 3.1.4, LE_ASSOCIATE.request
1348  * Associate the *tlvs with the *lan_dst address.
1349  * Will overwrite any previous association
1350  * Returns 1 for success, 0 for failure (out of memory)
1351  *
1352  */
1353 static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
1354                                u8 *tlvs, u32 sizeoftlvs)
1355 {
1356         int retval;
1357         struct sk_buff *skb;
1358         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1359
1360         if (compare_ether_addr(lan_dst, dev->dev_addr))
1361                 return (0);     /* not our mac address */
1362
1363         kfree(priv->tlvs);      /* NULL if there was no previous association */
1364
1365         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1366         if (priv->tlvs == NULL)
1367                 return (0);
1368         priv->sizeoftlvs = sizeoftlvs;
1369
1370         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1371         if (skb == NULL)
1372                 return 0;
1373         skb->len = sizeoftlvs;
1374         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1375         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1376         if (retval != 0)
1377                 printk("lec.c: lane2_associate_req() failed\n");
1378         /*
1379          * If the previous association has changed we must
1380          * somehow notify other LANE entities about the change
1381          */
1382         return (1);
1383 }
1384
1385 /*
1386  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1387  *
1388  */
1389 static void lane2_associate_ind(struct net_device *dev, u8 *mac_addr,
1390                                 u8 *tlvs, u32 sizeoftlvs)
1391 {
1392 #if 0
1393         int i = 0;
1394 #endif
1395         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1396 #if 0                           /*
1397                                  * Why have the TLVs in LE_ARP entries
1398                                  * since we do not use them? When you
1399                                  * uncomment this code, make sure the
1400                                  * TLVs get freed when entry is killed
1401                                  */
1402         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1403
1404         if (entry == NULL)
1405                 return;         /* should not happen */
1406
1407         kfree(entry->tlvs);
1408
1409         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1410         if (entry->tlvs == NULL)
1411                 return;
1412         entry->sizeoftlvs = sizeoftlvs;
1413 #endif
1414 #if 0
1415         printk("lec.c: lane2_associate_ind()\n");
1416         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1417         while (i < sizeoftlvs)
1418                 printk("%02x ", tlvs[i++]);
1419
1420         printk("\n");
1421 #endif
1422
1423         /* tell MPOA about the TLVs we saw */
1424         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1425                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1426                                                      tlvs, sizeoftlvs);
1427         }
1428         return;
1429 }
1430
1431 /*
1432  * Here starts what used to lec_arpc.c
1433  *
1434  * lec_arpc.c was added here when making
1435  * lane client modular. October 1997
1436  */
1437
1438 #include <linux/types.h>
1439 #include <linux/timer.h>
1440 #include <asm/param.h>
1441 #include <asm/atomic.h>
1442 #include <linux/inetdevice.h>
1443 #include <net/route.h>
1444
1445 #if 0
1446 #define DPRINTK(format,args...)
1447 /*
1448 #define DPRINTK printk
1449 */
1450 #endif
1451 #define DEBUG_ARP_TABLE 0
1452
1453 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1454
1455 static void lec_arp_check_expire(struct work_struct *work);
1456 static void lec_arp_expire_arp(unsigned long data);
1457
1458 /*
1459  * Arp table funcs
1460  */
1461
1462 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1463
1464 /*
1465  * Initialization of arp-cache
1466  */
1467 static void lec_arp_init(struct lec_priv *priv)
1468 {
1469         unsigned short i;
1470
1471         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1472                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1473         }
1474         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1475         INIT_HLIST_HEAD(&priv->lec_no_forward);
1476         INIT_HLIST_HEAD(&priv->mcast_fwds);
1477         spin_lock_init(&priv->lec_arp_lock);
1478         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1479         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1480 }
1481
1482 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1483 {
1484         if (entry->vcc) {
1485                 struct atm_vcc *vcc = entry->vcc;
1486                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1487                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1488
1489                 vcc->pop = vpriv->old_pop;
1490                 if (vpriv->xoff)
1491                         netif_wake_queue(dev);
1492                 kfree(vpriv);
1493                 vcc->user_back = NULL;
1494                 vcc->push = entry->old_push;
1495                 vcc_release_async(vcc, -EPIPE);
1496                 entry->vcc = NULL;
1497         }
1498         if (entry->recv_vcc) {
1499                 entry->recv_vcc->push = entry->old_recv_push;
1500                 vcc_release_async(entry->recv_vcc, -EPIPE);
1501                 entry->recv_vcc = NULL;
1502         }
1503 }
1504
1505 /*
1506  * Insert entry to lec_arp_table
1507  * LANE2: Add to the end of the list to satisfy 8.1.13
1508  */
1509 static inline void
1510 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1511 {
1512         struct hlist_head *tmp;
1513
1514         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1515         hlist_add_head(&entry->next, tmp);
1516
1517         DPRINTK("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1518                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1519                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1520                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1521 }
1522
1523 /*
1524  * Remove entry from lec_arp_table
1525  */
1526 static int
1527 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1528 {
1529         struct hlist_node *node;
1530         struct lec_arp_table *entry;
1531         int i, remove_vcc = 1;
1532
1533         if (!to_remove) {
1534                 return -1;
1535         }
1536
1537         hlist_del(&to_remove->next);
1538         del_timer(&to_remove->timer);
1539
1540         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1541         if (to_remove->status >= ESI_FLUSH_PENDING) {
1542                 /*
1543                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1544                  */
1545                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1546                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1547                                 if (memcmp(to_remove->atm_addr,
1548                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1549                                         remove_vcc = 0;
1550                                         break;
1551                                 }
1552                         }
1553                 }
1554                 if (remove_vcc)
1555                         lec_arp_clear_vccs(to_remove);
1556         }
1557         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1558
1559         DPRINTK("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1560                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1561                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1562                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1563         return 0;
1564 }
1565
1566 #if DEBUG_ARP_TABLE
1567 static char *get_status_string(unsigned char st)
1568 {
1569         switch (st) {
1570         case ESI_UNKNOWN:
1571                 return "ESI_UNKNOWN";
1572         case ESI_ARP_PENDING:
1573                 return "ESI_ARP_PENDING";
1574         case ESI_VC_PENDING:
1575                 return "ESI_VC_PENDING";
1576         case ESI_FLUSH_PENDING:
1577                 return "ESI_FLUSH_PENDING";
1578         case ESI_FORWARD_DIRECT:
1579                 return "ESI_FORWARD_DIRECT";
1580         default:
1581                 return "<UNKNOWN>";
1582         }
1583 }
1584
1585 static void dump_arp_table(struct lec_priv *priv)
1586 {
1587         struct hlist_node *node;
1588         struct lec_arp_table *rulla;
1589         char buf[256];
1590         int i, j, offset;
1591
1592         printk("Dump %p:\n", priv);
1593         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1594                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1595                         offset = 0;
1596                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1597                         offset += sprintf(buf + offset, "Mac:");
1598                         for (j = 0; j < ETH_ALEN; j++) {
1599                                 offset += sprintf(buf + offset,
1600                                                   "%2.2x ",
1601                                                   rulla->mac_addr[j] & 0xff);
1602                         }
1603                         offset += sprintf(buf + offset, "Atm:");
1604                         for (j = 0; j < ATM_ESA_LEN; j++) {
1605                                 offset += sprintf(buf + offset,
1606                                                   "%2.2x ",
1607                                                   rulla->atm_addr[j] & 0xff);
1608                         }
1609                         offset += sprintf(buf + offset,
1610                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1611                                           rulla->vcc ? rulla->vcc->vpi : 0,
1612                                           rulla->vcc ? rulla->vcc->vci : 0,
1613                                           rulla->recv_vcc ? rulla->recv_vcc->
1614                                           vpi : 0,
1615                                           rulla->recv_vcc ? rulla->recv_vcc->
1616                                           vci : 0, rulla->last_used,
1617                                           rulla->timestamp, rulla->no_tries);
1618                         offset +=
1619                             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\n", buf);
1624                 }
1625         }
1626
1627         if (!hlist_empty(&priv->lec_no_forward))
1628                 printk("No forward\n");
1629         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1630                 offset = 0;
1631                 offset += sprintf(buf + offset, "Mac:");
1632                 for (j = 0; j < ETH_ALEN; j++) {
1633                         offset += sprintf(buf + offset, "%2.2x ",
1634                                           rulla->mac_addr[j] & 0xff);
1635                 }
1636                 offset += sprintf(buf + offset, "Atm:");
1637                 for (j = 0; j < ATM_ESA_LEN; j++) {
1638                         offset += sprintf(buf + offset, "%2.2x ",
1639                                           rulla->atm_addr[j] & 0xff);
1640                 }
1641                 offset += sprintf(buf + offset,
1642                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1643                                   rulla->vcc ? rulla->vcc->vpi : 0,
1644                                   rulla->vcc ? rulla->vcc->vci : 0,
1645                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1646                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1647                                   rulla->last_used,
1648                                   rulla->timestamp, rulla->no_tries);
1649                 offset += sprintf(buf + offset,
1650                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1651                                   rulla->flags, rulla->packets_flooded,
1652                                   get_status_string(rulla->status));
1653                 printk("%s\n", buf);
1654         }
1655
1656         if (!hlist_empty(&priv->lec_arp_empty_ones))
1657                 printk("Empty ones\n");
1658         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1659                 offset = 0;
1660                 offset += sprintf(buf + offset, "Mac:");
1661                 for (j = 0; j < ETH_ALEN; j++) {
1662                         offset += sprintf(buf + offset, "%2.2x ",
1663                                           rulla->mac_addr[j] & 0xff);
1664                 }
1665                 offset += sprintf(buf + offset, "Atm:");
1666                 for (j = 0; j < ATM_ESA_LEN; j++) {
1667                         offset += sprintf(buf + offset, "%2.2x ",
1668                                           rulla->atm_addr[j] & 0xff);
1669                 }
1670                 offset += sprintf(buf + offset,
1671                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1672                                   rulla->vcc ? rulla->vcc->vpi : 0,
1673                                   rulla->vcc ? rulla->vcc->vci : 0,
1674                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1675                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1676                                   rulla->last_used,
1677                                   rulla->timestamp, rulla->no_tries);
1678                 offset += sprintf(buf + offset,
1679                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1680                                   rulla->flags, rulla->packets_flooded,
1681                                   get_status_string(rulla->status));
1682                 printk("%s", buf);
1683         }
1684
1685         if (!hlist_empty(&priv->mcast_fwds))
1686                 printk("Multicast Forward VCCs\n");
1687         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1688                 offset = 0;
1689                 offset += sprintf(buf + offset, "Mac:");
1690                 for (j = 0; j < ETH_ALEN; j++) {
1691                         offset += sprintf(buf + offset, "%2.2x ",
1692                                           rulla->mac_addr[j] & 0xff);
1693                 }
1694                 offset += sprintf(buf + offset, "Atm:");
1695                 for (j = 0; j < ATM_ESA_LEN; j++) {
1696                         offset += sprintf(buf + offset, "%2.2x ",
1697                                           rulla->atm_addr[j] & 0xff);
1698                 }
1699                 offset += sprintf(buf + offset,
1700                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1701                                   rulla->vcc ? rulla->vcc->vpi : 0,
1702                                   rulla->vcc ? rulla->vcc->vci : 0,
1703                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1704                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1705                                   rulla->last_used,
1706                                   rulla->timestamp, rulla->no_tries);
1707                 offset += sprintf(buf + offset,
1708                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1709                                   rulla->flags, rulla->packets_flooded,
1710                                   get_status_string(rulla->status));
1711                 printk("%s\n", buf);
1712         }
1713
1714 }
1715 #else
1716 #define dump_arp_table(priv) do { } while (0)
1717 #endif
1718
1719 /*
1720  * Destruction of arp-cache
1721  */
1722 static void lec_arp_destroy(struct lec_priv *priv)
1723 {
1724         unsigned long flags;
1725         struct hlist_node *node, *next;
1726         struct lec_arp_table *entry;
1727         int i;
1728
1729         cancel_rearming_delayed_work(&priv->lec_arp_work);
1730
1731         /*
1732          * Remove all entries
1733          */
1734
1735         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1736         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1737                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1738                         lec_arp_remove(priv, entry);
1739                         lec_arp_put(entry);
1740                 }
1741                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1742         }
1743
1744         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1745                 del_timer_sync(&entry->timer);
1746                 lec_arp_clear_vccs(entry);
1747                 hlist_del(&entry->next);
1748                 lec_arp_put(entry);
1749         }
1750         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1751
1752         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1753                 del_timer_sync(&entry->timer);
1754                 lec_arp_clear_vccs(entry);
1755                 hlist_del(&entry->next);
1756                 lec_arp_put(entry);
1757         }
1758         INIT_HLIST_HEAD(&priv->lec_no_forward);
1759
1760         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1761                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1762                 lec_arp_clear_vccs(entry);
1763                 hlist_del(&entry->next);
1764                 lec_arp_put(entry);
1765         }
1766         INIT_HLIST_HEAD(&priv->mcast_fwds);
1767         priv->mcast_vcc = NULL;
1768         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1769 }
1770
1771 /*
1772  * Find entry by mac_address
1773  */
1774 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1775                                           unsigned char *mac_addr)
1776 {
1777         struct hlist_node *node;
1778         struct hlist_head *head;
1779         struct lec_arp_table *entry;
1780
1781         DPRINTK("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1782                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1783                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1784
1785         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1786         hlist_for_each_entry(entry, node, head, next) {
1787                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1788                         return entry;
1789                 }
1790         }
1791         return NULL;
1792 }
1793
1794 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1795                                         unsigned char *mac_addr)
1796 {
1797         struct lec_arp_table *to_return;
1798
1799         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1800         if (!to_return) {
1801                 printk("LEC: Arp entry kmalloc failed\n");
1802                 return NULL;
1803         }
1804         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1805         INIT_HLIST_NODE(&to_return->next);
1806         init_timer(&to_return->timer);
1807         to_return->timer.function = lec_arp_expire_arp;
1808         to_return->timer.data = (unsigned long)to_return;
1809         to_return->last_used = jiffies;
1810         to_return->priv = priv;
1811         skb_queue_head_init(&to_return->tx_wait);
1812         atomic_set(&to_return->usage, 1);
1813         return to_return;
1814 }
1815
1816 /* Arp sent timer expired */
1817 static void lec_arp_expire_arp(unsigned long data)
1818 {
1819         struct lec_arp_table *entry;
1820
1821         entry = (struct lec_arp_table *)data;
1822
1823         DPRINTK("lec_arp_expire_arp\n");
1824         if (entry->status == ESI_ARP_PENDING) {
1825                 if (entry->no_tries <= entry->priv->max_retry_count) {
1826                         if (entry->is_rdesc)
1827                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1828                                              entry->mac_addr, NULL, NULL);
1829                         else
1830                                 send_to_lecd(entry->priv, l_arp_xmt,
1831                                              entry->mac_addr, NULL, NULL);
1832                         entry->no_tries++;
1833                 }
1834                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1835         }
1836 }
1837
1838 /* Unknown/unused vcc expire, remove associated entry */
1839 static void lec_arp_expire_vcc(unsigned long data)
1840 {
1841         unsigned long flags;
1842         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1843         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1844
1845         del_timer(&to_remove->timer);
1846
1847         DPRINTK("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1848                 to_remove, priv,
1849                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1850                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1851
1852         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1853         hlist_del(&to_remove->next);
1854         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1855
1856         lec_arp_clear_vccs(to_remove);
1857         lec_arp_put(to_remove);
1858 }
1859
1860 /*
1861  * Expire entries.
1862  * 1. Re-set timer
1863  * 2. For each entry, delete entries that have aged past the age limit.
1864  * 3. For each entry, depending on the status of the entry, perform
1865  *    the following maintenance.
1866  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1867  *       tick_count is above the max_unknown_frame_time, clear
1868  *       the tick_count to zero and clear the packets_flooded counter
1869  *       to zero. This supports the packet rate limit per address
1870  *       while flooding unknowns.
1871  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1872  *       than or equal to the path_switching_delay, change the status
1873  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1874  *       regardless of the progress of the flush protocol.
1875  */
1876 static void lec_arp_check_expire(struct work_struct *work)
1877 {
1878         unsigned long flags;
1879         struct lec_priv *priv =
1880                 container_of(work, struct lec_priv, lec_arp_work.work);
1881         struct hlist_node *node, *next;
1882         struct lec_arp_table *entry;
1883         unsigned long now;
1884         unsigned long time_to_check;
1885         int i;
1886
1887         DPRINTK("lec_arp_check_expire %p\n", priv);
1888         now = jiffies;
1889 restart:
1890         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1891         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1892                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1893                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1894                             priv->topology_change)
1895                                 time_to_check = priv->forward_delay_time;
1896                         else
1897                                 time_to_check = priv->aging_time;
1898
1899                         DPRINTK("About to expire: %lx - %lx > %lx\n",
1900                                 now, entry->last_used, time_to_check);
1901                         if (time_after(now, entry->last_used + time_to_check)
1902                             && !(entry->flags & LEC_PERMANENT_FLAG)
1903                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1904                                 /* Remove entry */
1905                                 DPRINTK("LEC:Entry timed out\n");
1906                                 lec_arp_remove(priv, entry);
1907                                 lec_arp_put(entry);
1908                         } else {
1909                                 /* Something else */
1910                                 if ((entry->status == ESI_VC_PENDING ||
1911                                      entry->status == ESI_ARP_PENDING)
1912                                     && time_after_eq(now,
1913                                                      entry->timestamp +
1914                                                      priv->
1915                                                      max_unknown_frame_time)) {
1916                                         entry->timestamp = jiffies;
1917                                         entry->packets_flooded = 0;
1918                                         if (entry->status == ESI_VC_PENDING)
1919                                                 send_to_lecd(priv, l_svc_setup,
1920                                                              entry->mac_addr,
1921                                                              entry->atm_addr,
1922                                                              NULL);
1923                                 }
1924                                 if (entry->status == ESI_FLUSH_PENDING
1925                                     &&
1926                                     time_after_eq(now, entry->timestamp +
1927                                                   priv->path_switching_delay)) {
1928                                         struct sk_buff *skb;
1929                                         struct atm_vcc *vcc = entry->vcc;
1930
1931                                         lec_arp_hold(entry);
1932                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1933                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1934                                                 lec_send(vcc, skb, entry->priv);
1935                                         entry->last_used = jiffies;
1936                                         entry->status = ESI_FORWARD_DIRECT;
1937                                         lec_arp_put(entry);
1938                                         goto restart;
1939                                 }
1940                         }
1941                 }
1942         }
1943         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1944
1945         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1946 }
1947
1948 /*
1949  * Try to find vcc where mac_address is attached.
1950  *
1951  */
1952 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1953                                        unsigned char *mac_to_find, int is_rdesc,
1954                                        struct lec_arp_table **ret_entry)
1955 {
1956         unsigned long flags;
1957         struct lec_arp_table *entry;
1958         struct atm_vcc *found;
1959
1960         if (mac_to_find[0] & 0x01) {
1961                 switch (priv->lane_version) {
1962                 case 1:
1963                         return priv->mcast_vcc;
1964                         break;
1965                 case 2: /* LANE2 wants arp for multicast addresses */
1966                         if (!compare_ether_addr(mac_to_find, bus_mac))
1967                                 return priv->mcast_vcc;
1968                         break;
1969                 default:
1970                         break;
1971                 }
1972         }
1973
1974         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1975         entry = lec_arp_find(priv, mac_to_find);
1976
1977         if (entry) {
1978                 if (entry->status == ESI_FORWARD_DIRECT) {
1979                         /* Connection Ok */
1980                         entry->last_used = jiffies;
1981                         lec_arp_hold(entry);
1982                         *ret_entry = entry;
1983                         found = entry->vcc;
1984                         goto out;
1985                 }
1986                 /*
1987                  * If the LE_ARP cache entry is still pending, reset count to 0
1988                  * so another LE_ARP request can be made for this frame.
1989                  */
1990                 if (entry->status == ESI_ARP_PENDING) {
1991                         entry->no_tries = 0;
1992                 }
1993                 /*
1994                  * Data direct VC not yet set up, check to see if the unknown
1995                  * frame count is greater than the limit. If the limit has
1996                  * not been reached, allow the caller to send packet to
1997                  * BUS.
1998                  */
1999                 if (entry->status != ESI_FLUSH_PENDING &&
2000                     entry->packets_flooded <
2001                     priv->maximum_unknown_frame_count) {
2002                         entry->packets_flooded++;
2003                         DPRINTK("LEC_ARP: Flooding..\n");
2004                         found = priv->mcast_vcc;
2005                         goto out;
2006                 }
2007                 /*
2008                  * We got here because entry->status == ESI_FLUSH_PENDING
2009                  * or BUS flood limit was reached for an entry which is
2010                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
2011                  */
2012                 lec_arp_hold(entry);
2013                 *ret_entry = entry;
2014                 DPRINTK("lec: entry->status %d entry->vcc %p\n", entry->status,
2015                         entry->vcc);
2016                 found = NULL;
2017         } else {
2018                 /* No matching entry was found */
2019                 entry = make_entry(priv, mac_to_find);
2020                 DPRINTK("LEC_ARP: Making entry\n");
2021                 if (!entry) {
2022                         found = priv->mcast_vcc;
2023                         goto out;
2024                 }
2025                 lec_arp_add(priv, entry);
2026                 /* We want arp-request(s) to be sent */
2027                 entry->packets_flooded = 1;
2028                 entry->status = ESI_ARP_PENDING;
2029                 entry->no_tries = 1;
2030                 entry->last_used = entry->timestamp = jiffies;
2031                 entry->is_rdesc = is_rdesc;
2032                 if (entry->is_rdesc)
2033                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
2034                                      NULL);
2035                 else
2036                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
2037                 entry->timer.expires = jiffies + (1 * HZ);
2038                 entry->timer.function = lec_arp_expire_arp;
2039                 add_timer(&entry->timer);
2040                 found = priv->mcast_vcc;
2041         }
2042
2043 out:
2044         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2045         return found;
2046 }
2047
2048 static int
2049 lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr,
2050                 unsigned long permanent)
2051 {
2052         unsigned long flags;
2053         struct hlist_node *node, *next;
2054         struct lec_arp_table *entry;
2055         int i;
2056
2057         DPRINTK("lec_addr_delete\n");
2058         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2059         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2060                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2061                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2062                             && (permanent ||
2063                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2064                                 lec_arp_remove(priv, entry);
2065                                 lec_arp_put(entry);
2066                         }
2067                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2068                         return 0;
2069                 }
2070         }
2071         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2072         return -1;
2073 }
2074
2075 /*
2076  * Notifies:  Response to arp_request (atm_addr != NULL)
2077  */
2078 static void
2079 lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
2080                unsigned char *atm_addr, unsigned long remoteflag,
2081                unsigned int targetless_le_arp)
2082 {
2083         unsigned long flags;
2084         struct hlist_node *node, *next;
2085         struct lec_arp_table *entry, *tmp;
2086         int i;
2087
2088         DPRINTK("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2089         DPRINTK("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2090                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2091                 mac_addr[4], mac_addr[5]);
2092
2093         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2094         entry = lec_arp_find(priv, mac_addr);
2095         if (entry == NULL && targetless_le_arp)
2096                 goto out;       /*
2097                                  * LANE2: ignore targetless LE_ARPs for which
2098                                  * we have no entry in the cache. 7.1.30
2099                                  */
2100         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2101                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2102                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2103                                 hlist_del(&entry->next);
2104                                 del_timer(&entry->timer);
2105                                 tmp = lec_arp_find(priv, mac_addr);
2106                                 if (tmp) {
2107                                         del_timer(&tmp->timer);
2108                                         tmp->status = ESI_FORWARD_DIRECT;
2109                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2110                                         tmp->vcc = entry->vcc;
2111                                         tmp->old_push = entry->old_push;
2112                                         tmp->last_used = jiffies;
2113                                         del_timer(&entry->timer);
2114                                         lec_arp_put(entry);
2115                                         entry = tmp;
2116                                 } else {
2117                                         entry->status = ESI_FORWARD_DIRECT;
2118                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2119                                         entry->last_used = jiffies;
2120                                         lec_arp_add(priv, entry);
2121                                 }
2122                                 if (remoteflag)
2123                                         entry->flags |= LEC_REMOTE_FLAG;
2124                                 else
2125                                         entry->flags &= ~LEC_REMOTE_FLAG;
2126                                 DPRINTK("After update\n");
2127                                 dump_arp_table(priv);
2128                                 goto out;
2129                         }
2130                 }
2131         }
2132
2133         entry = lec_arp_find(priv, mac_addr);
2134         if (!entry) {
2135                 entry = make_entry(priv, mac_addr);
2136                 if (!entry)
2137                         goto out;
2138                 entry->status = ESI_UNKNOWN;
2139                 lec_arp_add(priv, entry);
2140                 /* Temporary, changes before end of function */
2141         }
2142         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2143         del_timer(&entry->timer);
2144         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2145                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2146                         if (entry != tmp &&
2147                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2148                                 /* Vcc to this host exists */
2149                                 if (tmp->status > ESI_VC_PENDING) {
2150                                         /*
2151                                          * ESI_FLUSH_PENDING,
2152                                          * ESI_FORWARD_DIRECT
2153                                          */
2154                                         entry->vcc = tmp->vcc;
2155                                         entry->old_push = tmp->old_push;
2156                                 }
2157                                 entry->status = tmp->status;
2158                                 break;
2159                         }
2160                 }
2161         }
2162         if (remoteflag)
2163                 entry->flags |= LEC_REMOTE_FLAG;
2164         else
2165                 entry->flags &= ~LEC_REMOTE_FLAG;
2166         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2167                 entry->status = ESI_VC_PENDING;
2168                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2169         }
2170         DPRINTK("After update2\n");
2171         dump_arp_table(priv);
2172 out:
2173         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2174 }
2175
2176 /*
2177  * Notifies: Vcc setup ready
2178  */
2179 static void
2180 lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data,
2181               struct atm_vcc *vcc,
2182               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2183 {
2184         unsigned long flags;
2185         struct hlist_node *node;
2186         struct lec_arp_table *entry;
2187         int i, found_entry = 0;
2188
2189         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2190         if (ioc_data->receive == 2) {
2191                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2192
2193                 DPRINTK("LEC_ARP: Attaching mcast forward\n");
2194 #if 0
2195                 entry = lec_arp_find(priv, bus_mac);
2196                 if (!entry) {
2197                         printk("LEC_ARP: Multicast entry not found!\n");
2198                         goto out;
2199                 }
2200                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2201                 entry->recv_vcc = vcc;
2202                 entry->old_recv_push = old_push;
2203 #endif
2204                 entry = make_entry(priv, bus_mac);
2205                 if (entry == NULL)
2206                         goto out;
2207                 del_timer(&entry->timer);
2208                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2209                 entry->recv_vcc = vcc;
2210                 entry->old_recv_push = old_push;
2211                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2212                 goto out;
2213         } else if (ioc_data->receive == 1) {
2214                 /*
2215                  * Vcc which we don't want to make default vcc,
2216                  * attach it anyway.
2217                  */
2218                 DPRINTK
2219                     ("LEC_ARP:Attaching data direct, not default: "
2220                      "%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",
2221                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2222                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2223                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2224                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2225                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2226                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2227                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2228                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2229                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2230                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2231                 entry = make_entry(priv, bus_mac);
2232                 if (entry == NULL)
2233                         goto out;
2234                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2235                 memset(entry->mac_addr, 0, ETH_ALEN);
2236                 entry->recv_vcc = vcc;
2237                 entry->old_recv_push = old_push;
2238                 entry->status = ESI_UNKNOWN;
2239                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2240                 entry->timer.function = lec_arp_expire_vcc;
2241                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2242                 add_timer(&entry->timer);
2243                 dump_arp_table(priv);
2244                 goto out;
2245         }
2246         DPRINTK
2247             ("LEC_ARP:Attaching data direct, default: "
2248              "%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",
2249              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2250              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2251              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2252              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2253              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2254              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2255              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2256              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2257              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2258              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2259         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2260                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2261                         if (memcmp
2262                             (ioc_data->atm_addr, entry->atm_addr,
2263                              ATM_ESA_LEN) == 0) {
2264                                 DPRINTK("LEC_ARP: Attaching data direct\n");
2265                                 DPRINTK("Currently -> Vcc: %d, Rvcc:%d\n",
2266                                         entry->vcc ? entry->vcc->vci : 0,
2267                                         entry->recv_vcc ? entry->recv_vcc->
2268                                         vci : 0);
2269                                 found_entry = 1;
2270                                 del_timer(&entry->timer);
2271                                 entry->vcc = vcc;
2272                                 entry->old_push = old_push;
2273                                 if (entry->status == ESI_VC_PENDING) {
2274                                         if (priv->maximum_unknown_frame_count
2275                                             == 0)
2276                                                 entry->status =
2277                                                     ESI_FORWARD_DIRECT;
2278                                         else {
2279                                                 entry->timestamp = jiffies;
2280                                                 entry->status =
2281                                                     ESI_FLUSH_PENDING;
2282 #if 0
2283                                                 send_to_lecd(priv, l_flush_xmt,
2284                                                              NULL,
2285                                                              entry->atm_addr,
2286                                                              NULL);
2287 #endif
2288                                         }
2289                                 } else {
2290                                         /*
2291                                          * They were forming a connection
2292                                          * to us, and we to them. Our
2293                                          * ATM address is numerically lower
2294                                          * than theirs, so we make connection
2295                                          * we formed into default VCC (8.1.11).
2296                                          * Connection they made gets torn
2297                                          * down. This might confuse some
2298                                          * clients. Can be changed if
2299                                          * someone reports trouble...
2300                                          */
2301                                         ;
2302                                 }
2303                         }
2304                 }
2305         }
2306         if (found_entry) {
2307                 DPRINTK("After vcc was added\n");
2308                 dump_arp_table(priv);
2309                 goto out;
2310         }
2311         /*
2312          * Not found, snatch address from first data packet that arrives
2313          * from this vcc
2314          */
2315         entry = make_entry(priv, bus_mac);
2316         if (!entry)
2317                 goto out;
2318         entry->vcc = vcc;
2319         entry->old_push = old_push;
2320         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2321         memset(entry->mac_addr, 0, ETH_ALEN);
2322         entry->status = ESI_UNKNOWN;
2323         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2324         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2325         entry->timer.function = lec_arp_expire_vcc;
2326         add_timer(&entry->timer);
2327         DPRINTK("After vcc was added\n");
2328         dump_arp_table(priv);
2329 out:
2330         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2331 }
2332
2333 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2334 {
2335         unsigned long flags;
2336         struct hlist_node *node;
2337         struct lec_arp_table *entry;
2338         int i;
2339
2340         DPRINTK("LEC:lec_flush_complete %lx\n", tran_id);
2341 restart:
2342         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2343         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2344                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2345                         if (entry->flush_tran_id == tran_id
2346                             && entry->status == ESI_FLUSH_PENDING) {
2347                                 struct sk_buff *skb;
2348                                 struct atm_vcc *vcc = entry->vcc;
2349
2350                                 lec_arp_hold(entry);
2351                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2352                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2353                                         lec_send(vcc, skb, entry->priv);
2354                                 entry->last_used = jiffies;
2355                                 entry->status = ESI_FORWARD_DIRECT;
2356                                 lec_arp_put(entry);
2357                                 DPRINTK("LEC_ARP: Flushed\n");
2358                                 goto restart;
2359                         }
2360                 }
2361         }
2362         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2363         dump_arp_table(priv);
2364 }
2365
2366 static void
2367 lec_set_flush_tran_id(struct lec_priv *priv,
2368                       unsigned char *atm_addr, unsigned long tran_id)
2369 {
2370         unsigned long flags;
2371         struct hlist_node *node;
2372         struct lec_arp_table *entry;
2373         int i;
2374
2375         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2376         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2377                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2378                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2379                                 entry->flush_tran_id = tran_id;
2380                                 DPRINTK("Set flush transaction id to %lx for %p\n",
2381                                         tran_id, entry);
2382                         }
2383                 }
2384         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2385 }
2386
2387 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2388 {
2389         unsigned long flags;
2390         unsigned char mac_addr[] = {
2391                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2392         };
2393         struct lec_arp_table *to_add;
2394         struct lec_vcc_priv *vpriv;
2395         int err = 0;
2396
2397         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2398                 return -ENOMEM;
2399         vpriv->xoff = 0;
2400         vpriv->old_pop = vcc->pop;
2401         vcc->user_back = vpriv;
2402         vcc->pop = lec_pop;
2403         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2404         to_add = make_entry(priv, mac_addr);
2405         if (!to_add) {
2406                 vcc->pop = vpriv->old_pop;
2407                 kfree(vpriv);
2408                 err = -ENOMEM;
2409                 goto out;
2410         }
2411         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2412         to_add->status = ESI_FORWARD_DIRECT;
2413         to_add->flags |= LEC_PERMANENT_FLAG;
2414         to_add->vcc = vcc;
2415         to_add->old_push = vcc->push;
2416         vcc->push = lec_push;
2417         priv->mcast_vcc = vcc;
2418         lec_arp_add(priv, to_add);
2419 out:
2420         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2421         return err;
2422 }
2423
2424 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2425 {
2426         unsigned long flags;
2427         struct hlist_node *node, *next;
2428         struct lec_arp_table *entry;
2429         int i;
2430
2431         DPRINTK("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2432         dump_arp_table(priv);
2433
2434         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2435
2436         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2437                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2438                         if (vcc == entry->vcc) {
2439                                 lec_arp_remove(priv, entry);
2440                                 lec_arp_put(entry);
2441                                 if (priv->mcast_vcc == vcc) {
2442                                         priv->mcast_vcc = NULL;
2443                                 }
2444                         }
2445                 }
2446         }
2447
2448         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2449                 if (entry->vcc == vcc) {
2450                         lec_arp_clear_vccs(entry);
2451                         del_timer(&entry->timer);
2452                         hlist_del(&entry->next);
2453                         lec_arp_put(entry);
2454                 }
2455         }
2456
2457         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2458                 if (entry->recv_vcc == vcc) {
2459                         lec_arp_clear_vccs(entry);
2460                         del_timer(&entry->timer);
2461                         hlist_del(&entry->next);
2462                         lec_arp_put(entry);
2463                 }
2464         }
2465
2466         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2467                 if (entry->recv_vcc == vcc) {
2468                         lec_arp_clear_vccs(entry);
2469                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2470                         hlist_del(&entry->next);
2471                         lec_arp_put(entry);
2472                 }
2473         }
2474
2475         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2476         dump_arp_table(priv);
2477 }
2478
2479 static void
2480 lec_arp_check_empties(struct lec_priv *priv,
2481                       struct atm_vcc *vcc, struct sk_buff *skb)
2482 {
2483         unsigned long flags;
2484         struct hlist_node *node, *next;
2485         struct lec_arp_table *entry, *tmp;
2486         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2487         unsigned char *src;
2488 #ifdef CONFIG_TR
2489         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2490
2491         if (priv->is_trdev)
2492                 src = tr_hdr->h_source;
2493         else
2494 #endif
2495                 src = hdr->h_source;
2496
2497         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2498         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2499                 if (vcc == entry->vcc) {
2500                         del_timer(&entry->timer);
2501                         memcpy(entry->mac_addr, src, ETH_ALEN);
2502                         entry->status = ESI_FORWARD_DIRECT;
2503                         entry->last_used = jiffies;
2504                         /* We might have got an entry */
2505                         if ((tmp = lec_arp_find(priv, src))) {
2506                                 lec_arp_remove(priv, tmp);
2507                                 lec_arp_put(tmp);
2508                         }
2509                         hlist_del(&entry->next);
2510                         lec_arp_add(priv, entry);
2511                         goto out;
2512                 }
2513         }
2514         DPRINTK("LEC_ARP: Arp_check_empties: entry not found!\n");
2515 out:
2516         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2517 }
2518
2519 MODULE_LICENSE("GPL");