git.oblomov.eu Git - linux-2.6/blob - net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/bitops.h>
   9 #include <linux/capability.h>
  10
  11 /* We are ethernet device */
  12 #include <linux/if_ether.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <net/sock.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/ip.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/uaccess.h>
  20 #include <net/arp.h>
  21 #include <net/dst.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/seq_file.h>
  25
  26 /* TokenRing if needed */
  27 #ifdef CONFIG_TR
  28 #include <linux/trdevice.h>
  29 #endif
  30
  31 /* And atm device */
  32 #include <linux/atmdev.h>
  33 #include <linux/atmlec.h>
  34
  35 /* Proxy LEC knows about bridging */
  36 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  37 #include <linux/if_bridge.h>
  38 #include "../bridge/br_private.h"
  39
  40 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  41 #endif
  42
  43 /* Modular too */
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46
  47 #include "lec.h"
  48 #include "lec_arpc.h"
  49 #include "resources.h"
  50
  51 #define DUMP_PACKETS 0          /*
  52                                  * 0 = None,
  53                                  * 1 = 30 first bytes
  54                                  * 2 = Whole packet
  55                                  */
  56
  57 #define LEC_UNRES_QUE_LEN 8     /*
  58                                  * number of tx packets to queue for a
  59                                  * single destination while waiting for SVC
  60                                  */
  61
  62 static int lec_open(struct net_device *dev);
  63 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
  64 static int lec_close(struct net_device *dev);
  65 static struct net_device_stats *lec_get_stats(struct net_device *dev);
  66 static void lec_init(struct net_device *dev);
  67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  68                                           const unsigned char *mac_addr);
  69 static int lec_arp_remove(struct lec_priv *priv,
  70                           struct lec_arp_table *to_remove);
  71 /* LANE2 functions */
  72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  73                                 const u8 *tlvs, u32 sizeoftlvs);
  74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  75                          u8 **tlvs, u32 *sizeoftlvs);
  76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  77                                const u8 *tlvs, u32 sizeoftlvs);
  78
  79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  80                            unsigned long permanent);
  81 static void lec_arp_check_empties(struct lec_priv *priv,
  82                                   struct atm_vcc *vcc, struct sk_buff *skb);
  83 static void lec_arp_destroy(struct lec_priv *priv);
  84 static void lec_arp_init(struct lec_priv *priv);
  85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  86                                        const unsigned char *mac_to_find,
  87                                        int is_rdesc,
  88                                        struct lec_arp_table **ret_entry);
  89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  90                            const unsigned char *atm_addr, unsigned long remoteflag,
  91                            unsigned int targetless_le_arp);
  92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  94 static void lec_set_flush_tran_id(struct lec_priv *priv,
  95                                   const unsigned char *atm_addr,
  96                                   unsigned long tran_id);
  97 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
  98                           struct atm_vcc *vcc,
  99                           void (*old_push) (struct atm_vcc *vcc,
 100                                             struct sk_buff *skb));
 101 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 102
 103 /* must be done under lec_arp_lock */
 104 static inline void lec_arp_hold(struct lec_arp_table *entry)
 105 {
 106         atomic_inc(&entry->usage);
 107 }
 108
 109 static inline void lec_arp_put(struct lec_arp_table *entry)
 110 {
 111         if (atomic_dec_and_test(&entry->usage))
 112                 kfree(entry);
 113 }
 114
 115
 116 static struct lane2_ops lane2_ops = {
 117         lane2_resolve,          /* resolve,             spec 3.1.3 */
 118         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 119         NULL                    /* associate indicator, spec 3.1.5 */
 120 };
 121
 122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 123
 124 /* Device structures */
 125 static struct net_device *dev_lec[MAX_LEC_ITF];
 126
 127 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         struct ethhdr *eth;
 131         char *buff;
 132         struct lec_priv *priv;
 133
 134         /*
 135          * Check if this is a BPDU. If so, ask zeppelin to send
 136          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 137          * as the Config BPDU has
 138          */
 139         eth = (struct ethhdr *)skb->data;
 140         buff = skb->data + skb->dev->hard_header_len;
 141         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 142                 struct sock *sk;
 143                 struct sk_buff *skb2;
 144                 struct atmlec_msg *mesg;
 145
 146                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 147                 if (skb2 == NULL)
 148                         return;
 149                 skb2->len = sizeof(struct atmlec_msg);
 150                 mesg = (struct atmlec_msg *)skb2->data;
 151                 mesg->type = l_topology_change;
 152                 buff += 4;
 153                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 154
 155                 priv = (struct lec_priv *)dev->priv;
 156                 atm_force_charge(priv->lecd, skb2->truesize);
 157                 sk = sk_atm(priv->lecd);
 158                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 159                 sk->sk_data_ready(sk, skb2->len);
 160         }
 161
 162         return;
 163 }
 164 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 165
 166 /*
 167  * Modelled after tr_type_trans
 168  * All multicast and ARE or STE frames go to BUS.
 169  * Non source routed frames go by destination address.
 170  * Last hop source routed frames go by destination address.
 171  * Not last hop source routed frames go by _next_ route descriptor.
 172  * Returns pointer to destination MAC address or fills in rdesc
 173  * and returns NULL.
 174  */
 175 #ifdef CONFIG_TR
 176 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 177 {
 178         struct trh_hdr *trh;
 179         unsigned int riflen, num_rdsc;
 180
 181         trh = (struct trh_hdr *)packet;
 182         if (trh->daddr[0] & (uint8_t) 0x80)
 183                 return bus_mac; /* multicast */
 184
 185         if (trh->saddr[0] & TR_RII) {
 186                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 187                 if ((ntohs(trh->rcf) >> 13) != 0)
 188                         return bus_mac; /* ARE or STE */
 189         } else
 190                 return trh->daddr;      /* not source routed */
 191
 192         if (riflen < 6)
 193                 return trh->daddr;      /* last hop, source routed */
 194
 195         /* riflen is 6 or more, packet has more than one route descriptor */
 196         num_rdsc = (riflen / 2) - 1;
 197         memset(rdesc, 0, ETH_ALEN);
 198         /* offset 4 comes from LAN destination field in LE control frames */
 199         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 200                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 201         else {
 202                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 203                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 204         }
 205
 206         return NULL;
 207 }
 208 #endif /* CONFIG_TR */
 209
 210 /*
 211  * Open/initialize the netdevice. This is called (in the current kernel)
 212  * sometime after booting when the 'ifconfig' program is run.
 213  *
 214  * This routine should set everything up anew at each open, even
 215  * registers that "should" only need to be set once at boot, so that
 216  * there is non-reboot way to recover if something goes wrong.
 217  */
 218
 219 static int lec_open(struct net_device *dev)
 220 {
 221         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 222
 223         netif_start_queue(dev);
 224         memset(&priv->stats, 0, sizeof(struct net_device_stats));
 225
 226         return 0;
 227 }
 228
 229 static __inline__ void
 230 lec_send(struct atm_vcc *vcc, struct sk_buff *skb, struct lec_priv *priv)
 231 {
 232         ATM_SKB(skb)->vcc = vcc;
 233         ATM_SKB(skb)->atm_options = vcc->atm_options;
 234
 235         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 236         if (vcc->send(vcc, skb) < 0) {
 237                 priv->stats.tx_dropped++;
 238                 return;
 239         }
 240
 241         priv->stats.tx_packets++;
 242         priv->stats.tx_bytes += skb->len;
 243 }
 244
 245 static void lec_tx_timeout(struct net_device *dev)
 246 {
 247         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 248         dev->trans_start = jiffies;
 249         netif_wake_queue(dev);
 250 }
 251
 252 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 253 {
 254         struct sk_buff *skb2;
 255         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 256         struct lecdatahdr_8023 *lec_h;
 257         struct atm_vcc *vcc;
 258         struct lec_arp_table *entry;
 259         unsigned char *dst;
 260         int min_frame_size;
 261 #ifdef CONFIG_TR
 262         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 263 #endif
 264         int is_rdesc;
 265 #if DUMP_PACKETS > 0
 266         char buf[300];
 267         int i = 0;
 268 #endif /* DUMP_PACKETS >0 */
 269
 270         pr_debug("lec_start_xmit called\n");
 271         if (!priv->lecd) {
 272                 printk("%s:No lecd attached\n", dev->name);
 273                 priv->stats.tx_errors++;
 274                 netif_stop_queue(dev);
 275                 return -EUNATCH;
 276         }
 277
 278         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 279                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 280                 (long)skb_end_pointer(skb));
 281 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 282         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 283                 lec_handle_bridge(skb, dev);
 284 #endif
 285
 286         /* Make sure we have room for lec_id */
 287         if (skb_headroom(skb) < 2) {
 288
 289                 pr_debug("lec_start_xmit: reallocating skb\n");
 290                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 291                 kfree_skb(skb);
 292                 if (skb2 == NULL)
 293                         return 0;
 294                 skb = skb2;
 295         }
 296         skb_push(skb, 2);
 297
 298         /* Put le header to place, works for TokenRing too */
 299         lec_h = (struct lecdatahdr_8023 *)skb->data;
 300         lec_h->le_header = htons(priv->lecid);
 301
 302 #ifdef CONFIG_TR
 303         /*
 304          * Ugly. Use this to realign Token Ring packets for
 305          * e.g. PCA-200E driver.
 306          */
 307         if (priv->is_trdev) {
 308                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 309                 kfree_skb(skb);
 310                 if (skb2 == NULL)
 311                         return 0;
 312                 skb = skb2;
 313         }
 314 #endif
 315
 316 #if DUMP_PACKETS > 0
 317         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 318                skb->len, priv->lecid);
 319 #if DUMP_PACKETS >= 2
 320         for (i = 0; i < skb->len && i < 99; i++) {
 321                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 322         }
 323 #elif DUMP_PACKETS >= 1
 324         for (i = 0; i < skb->len && i < 30; i++) {
 325                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 326         }
 327 #endif /* DUMP_PACKETS >= 1 */
 328         if (i == skb->len)
 329                 printk("%s\n", buf);
 330         else
 331                 printk("%s...\n", buf);
 332 #endif /* DUMP_PACKETS > 0 */
 333
 334         /* Minimum ethernet-frame size */
 335 #ifdef CONFIG_TR
 336         if (priv->is_trdev)
 337                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 338         else
 339 #endif
 340                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 341         if (skb->len < min_frame_size) {
 342                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 343                         skb2 = skb_copy_expand(skb, 0,
 344                                                min_frame_size - skb->truesize,
 345                                                GFP_ATOMIC);
 346                         dev_kfree_skb(skb);
 347                         if (skb2 == NULL) {
 348                                 priv->stats.tx_dropped++;
 349                                 return 0;
 350                         }
 351                         skb = skb2;
 352                 }
 353                 skb_put(skb, min_frame_size - skb->len);
 354         }
 355
 356         /* Send to right vcc */
 357         is_rdesc = 0;
 358         dst = lec_h->h_dest;
 359 #ifdef CONFIG_TR
 360         if (priv->is_trdev) {
 361                 dst = get_tr_dst(skb->data + 2, rdesc);
 362                 if (dst == NULL) {
 363                         dst = rdesc;
 364                         is_rdesc = 1;
 365                 }
 366         }
 367 #endif
 368         entry = NULL;
 369         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 370         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 371                 vcc, vcc ? vcc->flags : 0, entry);
 372         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 373                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 374                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 375                                 dev->name);
 376                         pr_debug("MAC address " MAC_FMT "\n",
 377                                  lec_h->h_dest[0], lec_h->h_dest[1],
 378                                  lec_h->h_dest[2], lec_h->h_dest[3],
 379                                  lec_h->h_dest[4], lec_h->h_dest[5]);
 380                         skb_queue_tail(&entry->tx_wait, skb);
 381                 } else {
 382                         pr_debug
 383                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 384                              dev->name);
 385                         pr_debug("MAC address " MAC_FMT "\n",
 386                                  lec_h->h_dest[0], lec_h->h_dest[1],
 387                                  lec_h->h_dest[2], lec_h->h_dest[3],
 388                                  lec_h->h_dest[4], lec_h->h_dest[5]);
 389                         priv->stats.tx_dropped++;
 390                         dev_kfree_skb(skb);
 391                 }
 392                 goto out;
 393         }
 394 #if DUMP_PACKETS > 0
 395         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 396 #endif /* DUMP_PACKETS > 0 */
 397
 398         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 399                 pr_debug("lec.c: emptying tx queue, ");
 400                 pr_debug("MAC address " MAC_FMT "\n",
 401                          lec_h->h_dest[0], lec_h->h_dest[1],
 402                          lec_h->h_dest[2], lec_h->h_dest[3],
 403                          lec_h->h_dest[4], lec_h->h_dest[5]);
 404                 lec_send(vcc, skb2, priv);
 405         }
 406
 407         lec_send(vcc, skb, priv);
 408
 409         if (!atm_may_send(vcc, 0)) {
 410                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 411
 412                 vpriv->xoff = 1;
 413                 netif_stop_queue(dev);
 414
 415                 /*
 416                  * vcc->pop() might have occurred in between, making
 417                  * the vcc usuable again.  Since xmit is serialized,
 418                  * this is the only situation we have to re-test.
 419                  */
 420
 421                 if (atm_may_send(vcc, 0))
 422                         netif_wake_queue(dev);
 423         }
 424
 425 out:
 426         if (entry)
 427                 lec_arp_put(entry);
 428         dev->trans_start = jiffies;
 429         return 0;
 430 }
 431
 432 /* The inverse routine to net_open(). */
 433 static int lec_close(struct net_device *dev)
 434 {
 435         netif_stop_queue(dev);
 436         return 0;
 437 }
 438
 439 /*
 440  * Get the current statistics.
 441  * This may be called with the card open or closed.
 442  */
 443 static struct net_device_stats *lec_get_stats(struct net_device *dev)
 444 {
 445         return &((struct lec_priv *)dev->priv)->stats;
 446 }
 447
 448 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 449 {
 450         unsigned long flags;
 451         struct net_device *dev = (struct net_device *)vcc->proto_data;
 452         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 453         struct atmlec_msg *mesg;
 454         struct lec_arp_table *entry;
 455         int i;
 456         char *tmp;              /* FIXME */
 457
 458         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 459         mesg = (struct atmlec_msg *)skb->data;
 460         tmp = skb->data;
 461         tmp += sizeof(struct atmlec_msg);
 462         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 463         switch (mesg->type) {
 464         case l_set_mac_addr:
 465                 for (i = 0; i < 6; i++) {
 466                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 467                 }
 468                 break;
 469         case l_del_mac_addr:
 470                 for (i = 0; i < 6; i++) {
 471                         dev->dev_addr[i] = 0;
 472                 }
 473                 break;
 474         case l_addr_delete:
 475                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 476                                 mesg->content.normal.flag);
 477                 break;
 478         case l_topology_change:
 479                 priv->topology_change = mesg->content.normal.flag;
 480                 break;
 481         case l_flush_complete:
 482                 lec_flush_complete(priv, mesg->content.normal.flag);
 483                 break;
 484         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 485                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 486                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 487                 lec_arp_remove(priv, entry);
 488                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 489
 490                 if (mesg->content.normal.no_source_le_narp)
 491                         break;
 492                 /* FALL THROUGH */
 493         case l_arp_update:
 494                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 495                                mesg->content.normal.atm_addr,
 496                                mesg->content.normal.flag,
 497                                mesg->content.normal.targetless_le_arp);
 498                 pr_debug("lec: in l_arp_update\n");
 499                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 500                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 501                                 mesg->sizeoftlvs);
 502                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 503                                             tmp, mesg->sizeoftlvs);
 504                 }
 505                 break;
 506         case l_config:
 507                 priv->maximum_unknown_frame_count =
 508                     mesg->content.config.maximum_unknown_frame_count;
 509                 priv->max_unknown_frame_time =
 510                     (mesg->content.config.max_unknown_frame_time * HZ);
 511                 priv->max_retry_count = mesg->content.config.max_retry_count;
 512                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 513                 priv->forward_delay_time =
 514                     (mesg->content.config.forward_delay_time * HZ);
 515                 priv->arp_response_time =
 516                     (mesg->content.config.arp_response_time * HZ);
 517                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 518                 priv->path_switching_delay =
 519                     (mesg->content.config.path_switching_delay * HZ);
 520                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 521                 priv->lane2_ops = NULL;
 522                 if (priv->lane_version > 1)
 523                         priv->lane2_ops = &lane2_ops;
 524                 if (dev->change_mtu(dev, mesg->content.config.mtu))
 525                         printk("%s: change_mtu to %d failed\n", dev->name,
 526                                mesg->content.config.mtu);
 527                 priv->is_proxy = mesg->content.config.is_proxy;
 528                 break;
 529         case l_flush_tran_id:
 530                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 531                                       mesg->content.normal.flag);
 532                 break;
 533         case l_set_lecid:
 534                 priv->lecid =
 535                     (unsigned short)(0xffff & mesg->content.normal.flag);
 536                 break;
 537         case l_should_bridge:
 538 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 539                 {
 540                         struct net_bridge_fdb_entry *f;
 541
 542                         pr_debug
 543                             ("%s: bridge zeppelin asks about " MAC_FMT "\n",
 544                              dev->name,
 545                              mesg->content.proxy.mac_addr[0],
 546                              mesg->content.proxy.mac_addr[1],
 547                              mesg->content.proxy.mac_addr[2],
 548                              mesg->content.proxy.mac_addr[3],
 549                              mesg->content.proxy.mac_addr[4],
 550                              mesg->content.proxy.mac_addr[5]);
 551
 552                         if (br_fdb_get_hook == NULL || dev->br_port == NULL)
 553                                 break;
 554
 555                         f = br_fdb_get_hook(dev->br_port->br,
 556                                             mesg->content.proxy.mac_addr);
 557                         if (f != NULL && f->dst->dev != dev
 558                             && f->dst->state == BR_STATE_FORWARDING) {
 559                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 560                                 struct sk_buff *skb2;
 561                                 struct sock *sk;
 562
 563                                 pr_debug
 564                                     ("%s: entry found, responding to zeppelin\n",
 565                                      dev->name);
 566                                 skb2 =
 567                                     alloc_skb(sizeof(struct atmlec_msg),
 568                                               GFP_ATOMIC);
 569                                 if (skb2 == NULL) {
 570                                         br_fdb_put_hook(f);
 571                                         break;
 572                                 }
 573                                 skb2->len = sizeof(struct atmlec_msg);
 574                                 skb_copy_to_linear_data(skb2, mesg,
 575                                                         sizeof(*mesg));
 576                                 atm_force_charge(priv->lecd, skb2->truesize);
 577                                 sk = sk_atm(priv->lecd);
 578                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 579                                 sk->sk_data_ready(sk, skb2->len);
 580                         }
 581                         if (f != NULL)
 582                                 br_fdb_put_hook(f);
 583                 }
 584 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 585                 break;
 586         default:
 587                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 588                 dev_kfree_skb(skb);
 589                 return -EINVAL;
 590         }
 591         dev_kfree_skb(skb);
 592         return 0;
 593 }
 594
 595 static void lec_atm_close(struct atm_vcc *vcc)
 596 {
 597         struct sk_buff *skb;
 598         struct net_device *dev = (struct net_device *)vcc->proto_data;
 599         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 600
 601         priv->lecd = NULL;
 602         /* Do something needful? */
 603
 604         netif_stop_queue(dev);
 605         lec_arp_destroy(priv);
 606
 607         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 608                 printk("%s lec_atm_close: closing with messages pending\n",
 609                        dev->name);
 610         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 611                 atm_return(vcc, skb->truesize);
 612                 dev_kfree_skb(skb);
 613         }
 614
 615         printk("%s: Shut down!\n", dev->name);
 616         module_put(THIS_MODULE);
 617 }
 618
 619 static struct atmdev_ops lecdev_ops = {
 620         .close = lec_atm_close,
 621         .send = lec_atm_send
 622 };
 623
 624 static struct atm_dev lecatm_dev = {
 625         .ops = &lecdev_ops,
 626         .type = "lec",
 627         .number = 999,          /* dummy device number */
 628         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 629 };
 630
 631 /*
 632  * LANE2: new argument struct sk_buff *data contains
 633  * the LE_ARP based TLVs introduced in the LANE2 spec
 634  */
 635 static int
 636 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 637              const unsigned char *mac_addr, const unsigned char *atm_addr,
 638              struct sk_buff *data)
 639 {
 640         struct sock *sk;
 641         struct sk_buff *skb;
 642         struct atmlec_msg *mesg;
 643
 644         if (!priv || !priv->lecd) {
 645                 return -1;
 646         }
 647         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 648         if (!skb)
 649                 return -1;
 650         skb->len = sizeof(struct atmlec_msg);
 651         mesg = (struct atmlec_msg *)skb->data;
 652         memset(mesg, 0, sizeof(struct atmlec_msg));
 653         mesg->type = type;
 654         if (data != NULL)
 655                 mesg->sizeoftlvs = data->len;
 656         if (mac_addr)
 657                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 658         else
 659                 mesg->content.normal.targetless_le_arp = 1;
 660         if (atm_addr)
 661                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 662
 663         atm_force_charge(priv->lecd, skb->truesize);
 664         sk = sk_atm(priv->lecd);
 665         skb_queue_tail(&sk->sk_receive_queue, skb);
 666         sk->sk_data_ready(sk, skb->len);
 667
 668         if (data != NULL) {
 669                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 670                 atm_force_charge(priv->lecd, data->truesize);
 671                 skb_queue_tail(&sk->sk_receive_queue, data);
 672                 sk->sk_data_ready(sk, skb->len);
 673         }
 674
 675         return 0;
 676 }
 677
 678 /* shamelessly stolen from drivers/net/net_init.c */
 679 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 680 {
 681         if ((new_mtu < 68) || (new_mtu > 18190))
 682                 return -EINVAL;
 683         dev->mtu = new_mtu;
 684         return 0;
 685 }
 686
 687 static void lec_set_multicast_list(struct net_device *dev)
 688 {
 689         /*
 690          * by default, all multicast frames arrive over the bus.
 691          * eventually support selective multicast service
 692          */
 693         return;
 694 }
 695
 696 static void lec_init(struct net_device *dev)
 697 {
 698         dev->change_mtu = lec_change_mtu;
 699         dev->open = lec_open;
 700         dev->stop = lec_close;
 701         dev->hard_start_xmit = lec_start_xmit;
 702         dev->tx_timeout = lec_tx_timeout;
 703
 704         dev->get_stats = lec_get_stats;
 705         dev->set_multicast_list = lec_set_multicast_list;
 706         dev->do_ioctl = NULL;
 707         printk("%s: Initialized!\n", dev->name);
 708 }
 709
 710 static const unsigned char lec_ctrl_magic[] = {
 711         0xff,
 712         0x00,
 713         0x01,
 714         0x01
 715 };
 716
 717 #define LEC_DATA_DIRECT_8023  2
 718 #define LEC_DATA_DIRECT_8025  3
 719
 720 static int lec_is_data_direct(struct atm_vcc *vcc)
 721 {
 722         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 723                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 724 }
 725
 726 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 727 {
 728         unsigned long flags;
 729         struct net_device *dev = (struct net_device *)vcc->proto_data;
 730         struct lec_priv *priv = (struct lec_priv *)dev->priv;
 731
 732 #if DUMP_PACKETS >0
 733         int i = 0;
 734         char buf[300];
 735
 736         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 737                vcc->vpi, vcc->vci);
 738 #endif
 739         if (!skb) {
 740                 pr_debug("%s: null skb\n", dev->name);
 741                 lec_vcc_close(priv, vcc);
 742                 return;
 743         }
 744 #if DUMP_PACKETS > 0
 745         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 746                skb->len, priv->lecid);
 747 #if DUMP_PACKETS >= 2
 748         for (i = 0; i < skb->len && i < 99; i++) {
 749                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 750         }
 751 #elif DUMP_PACKETS >= 1
 752         for (i = 0; i < skb->len && i < 30; i++) {
 753                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 754         }
 755 #endif /* DUMP_PACKETS >= 1 */
 756         if (i == skb->len)
 757                 printk("%s\n", buf);
 758         else
 759                 printk("%s...\n", buf);
 760 #endif /* DUMP_PACKETS > 0 */
 761         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 762                 struct sock *sk = sk_atm(vcc);
 763
 764                 pr_debug("%s: To daemon\n", dev->name);
 765                 skb_queue_tail(&sk->sk_receive_queue, skb);
 766                 sk->sk_data_ready(sk, skb->len);
 767         } else {                /* Data frame, queue to protocol handlers */
 768                 struct lec_arp_table *entry;
 769                 unsigned char *src, *dst;
 770
 771                 atm_return(vcc, skb->truesize);
 772                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 773                     !priv->lecd || !(dev->flags & IFF_UP)) {
 774                         /*
 775                          * Probably looping back, or if lecd is missing,
 776                          * lecd has gone down
 777                          */
 778                         pr_debug("Ignoring frame...\n");
 779                         dev_kfree_skb(skb);
 780                         return;
 781                 }
 782 #ifdef CONFIG_TR
 783                 if (priv->is_trdev)
 784                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 785                 else
 786 #endif
 787                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 788
 789                 /*
 790                  * If this is a Data Direct VCC, and the VCC does not match
 791                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 792                  */
 793                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 794                 if (lec_is_data_direct(vcc)) {
 795 #ifdef CONFIG_TR
 796                         if (priv->is_trdev)
 797                                 src =
 798                                     ((struct lecdatahdr_8025 *)skb->data)->
 799                                     h_source;
 800                         else
 801 #endif
 802                                 src =
 803                                     ((struct lecdatahdr_8023 *)skb->data)->
 804                                     h_source;
 805                         entry = lec_arp_find(priv, src);
 806                         if (entry && entry->vcc != vcc) {
 807                                 lec_arp_remove(priv, entry);
 808                                 lec_arp_put(entry);
 809                         }
 810                 }
 811                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 812
 813                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 814                     !priv->is_proxy &&  /* Proxy wants all the packets */
 815                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 816                         dev_kfree_skb(skb);
 817                         return;
 818                 }
 819                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 820                         lec_arp_check_empties(priv, vcc, skb);
 821                 }
 822                 skb_pull(skb, 2);       /* skip lec_id */
 823 #ifdef CONFIG_TR
 824                 if (priv->is_trdev)
 825                         skb->protocol = tr_type_trans(skb, dev);
 826                 else
 827 #endif
 828                         skb->protocol = eth_type_trans(skb, dev);
 829                 priv->stats.rx_packets++;
 830                 priv->stats.rx_bytes += skb->len;
 831                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 832                 netif_rx(skb);
 833         }
 834 }
 835
 836 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 837 {
 838         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 839         struct net_device *dev = skb->dev;
 840
 841         if (vpriv == NULL) {
 842                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 843                 return;
 844         }
 845
 846         vpriv->old_pop(vcc, skb);
 847
 848         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 849                 vpriv->xoff = 0;
 850                 if (netif_running(dev) && netif_queue_stopped(dev))
 851                         netif_wake_queue(dev);
 852         }
 853 }
 854
 855 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 856 {
 857         struct lec_vcc_priv *vpriv;
 858         int bytes_left;
 859         struct atmlec_ioc ioc_data;
 860
 861         /* Lecd must be up in this case */
 862         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 863         if (bytes_left != 0) {
 864                 printk
 865                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 866                      bytes_left);
 867         }
 868         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 869             !dev_lec[ioc_data.dev_num])
 870                 return -EINVAL;
 871         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 872                 return -ENOMEM;
 873         vpriv->xoff = 0;
 874         vpriv->old_pop = vcc->pop;
 875         vcc->user_back = vpriv;
 876         vcc->pop = lec_pop;
 877         lec_vcc_added(dev_lec[ioc_data.dev_num]->priv,
 878                       &ioc_data, vcc, vcc->push);
 879         vcc->proto_data = dev_lec[ioc_data.dev_num];
 880         vcc->push = lec_push;
 881         return 0;
 882 }
 883
 884 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 885 {
 886         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 887                 return -EINVAL;
 888         vcc->proto_data = dev_lec[arg];
 889         return (lec_mcast_make((struct lec_priv *)dev_lec[arg]->priv, vcc));
 890 }
 891
 892 /* Initialize device. */
 893 static int lecd_attach(struct atm_vcc *vcc, int arg)
 894 {
 895         int i;
 896         struct lec_priv *priv;
 897
 898         if (arg < 0)
 899                 i = 0;
 900         else
 901                 i = arg;
 902 #ifdef CONFIG_TR
 903         if (arg >= MAX_LEC_ITF)
 904                 return -EINVAL;
 905 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 906         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 907                 return -EINVAL;
 908 #endif
 909         if (!dev_lec[i]) {
 910                 int is_trdev, size;
 911
 912                 is_trdev = 0;
 913                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 914                         is_trdev = 1;
 915
 916                 size = sizeof(struct lec_priv);
 917 #ifdef CONFIG_TR
 918                 if (is_trdev)
 919                         dev_lec[i] = alloc_trdev(size);
 920                 else
 921 #endif
 922                         dev_lec[i] = alloc_etherdev(size);
 923                 if (!dev_lec[i])
 924                         return -ENOMEM;
 925                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 926                 if (register_netdev(dev_lec[i])) {
 927                         free_netdev(dev_lec[i]);
 928                         return -EINVAL;
 929                 }
 930
 931                 priv = dev_lec[i]->priv;
 932                 priv->is_trdev = is_trdev;
 933                 lec_init(dev_lec[i]);
 934         } else {
 935                 priv = dev_lec[i]->priv;
 936                 if (priv->lecd)
 937                         return -EADDRINUSE;
 938         }
 939         lec_arp_init(priv);
 940         priv->itfnum = i;       /* LANE2 addition */
 941         priv->lecd = vcc;
 942         vcc->dev = &lecatm_dev;
 943         vcc_insert_socket(sk_atm(vcc));
 944
 945         vcc->proto_data = dev_lec[i];
 946         set_bit(ATM_VF_META, &vcc->flags);
 947         set_bit(ATM_VF_READY, &vcc->flags);
 948
 949         /* Set default values to these variables */
 950         priv->maximum_unknown_frame_count = 1;
 951         priv->max_unknown_frame_time = (1 * HZ);
 952         priv->vcc_timeout_period = (1200 * HZ);
 953         priv->max_retry_count = 1;
 954         priv->aging_time = (300 * HZ);
 955         priv->forward_delay_time = (15 * HZ);
 956         priv->topology_change = 0;
 957         priv->arp_response_time = (1 * HZ);
 958         priv->flush_timeout = (4 * HZ);
 959         priv->path_switching_delay = (6 * HZ);
 960
 961         if (dev_lec[i]->flags & IFF_UP) {
 962                 netif_start_queue(dev_lec[i]);
 963         }
 964         __module_get(THIS_MODULE);
 965         return i;
 966 }
 967
 968 #ifdef CONFIG_PROC_FS
 969 static char *lec_arp_get_status_string(unsigned char status)
 970 {
 971         static char *lec_arp_status_string[] = {
 972                 "ESI_UNKNOWN       ",
 973                 "ESI_ARP_PENDING   ",
 974                 "ESI_VC_PENDING    ",
 975                 "<Undefined>       ",
 976                 "ESI_FLUSH_PENDING ",
 977                 "ESI_FORWARD_DIRECT"
 978         };
 979
 980         if (status > ESI_FORWARD_DIRECT)
 981                 status = 3;     /* ESI_UNDEFINED */
 982         return lec_arp_status_string[status];
 983 }
 984
 985 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 986 {
 987         int i;
 988
 989         for (i = 0; i < ETH_ALEN; i++)
 990                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 991         seq_printf(seq, " ");
 992         for (i = 0; i < ATM_ESA_LEN; i++)
 993                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 994         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 995                    entry->flags & 0xffff);
 996         if (entry->vcc)
 997                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 998         else
 999                 seq_printf(seq, "        ");
1000         if (entry->recv_vcc) {
1001                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
1002                            entry->recv_vcc->vci);
1003         }
1004         seq_putc(seq, '\n');
1005 }
1006
1007 struct lec_state {
1008         unsigned long flags;
1009         struct lec_priv *locked;
1010         struct hlist_node *node;
1011         struct net_device *dev;
1012         int itf;
1013         int arp_table;
1014         int misc_table;
1015 };
1016
1017 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
1018                           loff_t *l)
1019 {
1020         struct hlist_node *e = state->node;
1021         struct lec_arp_table *tmp;
1022
1023         if (!e)
1024                 e = tbl->first;
1025         if (e == SEQ_START_TOKEN) {
1026                 e = tbl->first;
1027                 --*l;
1028         }
1029
1030         hlist_for_each_entry_from(tmp, e, next) {
1031                 if (--*l < 0)
1032                         break;
1033         }
1034         state->node = e;
1035
1036         return (*l < 0) ? state : NULL;
1037 }
1038
1039 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1040                           struct lec_priv *priv)
1041 {
1042         void *v = NULL;
1043         int p;
1044
1045         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1046                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1047                 if (v)
1048                         break;
1049         }
1050         state->arp_table = p;
1051         return v;
1052 }
1053
1054 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1055                            struct lec_priv *priv)
1056 {
1057         struct hlist_head *lec_misc_tables[] = {
1058                 &priv->lec_arp_empty_ones,
1059                 &priv->lec_no_forward,
1060                 &priv->mcast_fwds
1061         };
1062         void *v = NULL;
1063         int q;
1064
1065         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1066                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1067                 if (v)
1068                         break;
1069         }
1070         state->misc_table = q;
1071         return v;
1072 }
1073
1074 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1075                            struct lec_priv *priv)
1076 {
1077         if (!state->locked) {
1078                 state->locked = priv;
1079                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1080         }
1081         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1082                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1083                 state->locked = NULL;
1084                 /* Partial state reset for the next time we get called */
1085                 state->arp_table = state->misc_table = 0;
1086         }
1087         return state->locked;
1088 }
1089
1090 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1091 {
1092         struct net_device *dev;
1093         void *v;
1094
1095         dev = state->dev ? state->dev : dev_lec[state->itf];
1096         v = (dev && dev->priv) ? lec_priv_walk(state, l, dev->priv) : NULL;
1097         if (!v && dev) {
1098                 dev_put(dev);
1099                 /* Partial state reset for the next time we get called */
1100                 dev = NULL;
1101         }
1102         state->dev = dev;
1103         return v;
1104 }
1105
1106 static void *lec_get_idx(struct lec_state *state, loff_t l)
1107 {
1108         void *v = NULL;
1109
1110         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1111                 v = lec_itf_walk(state, &l);
1112                 if (v)
1113                         break;
1114         }
1115         return v;
1116 }
1117
1118 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1119 {
1120         struct lec_state *state = seq->private;
1121
1122         state->itf = 0;
1123         state->dev = NULL;
1124         state->locked = NULL;
1125         state->arp_table = 0;
1126         state->misc_table = 0;
1127         state->node = SEQ_START_TOKEN;
1128
1129         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1130 }
1131
1132 static void lec_seq_stop(struct seq_file *seq, void *v)
1133 {
1134         struct lec_state *state = seq->private;
1135
1136         if (state->dev) {
1137                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1138                                        state->flags);
1139                 dev_put(state->dev);
1140         }
1141 }
1142
1143 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1144 {
1145         struct lec_state *state = seq->private;
1146
1147         v = lec_get_idx(state, 1);
1148         *pos += !!PTR_ERR(v);
1149         return v;
1150 }
1151
1152 static int lec_seq_show(struct seq_file *seq, void *v)
1153 {
1154         static char lec_banner[] = "Itf  MAC          ATM destination"
1155             "                          Status            Flags "
1156             "VPI/VCI Recv VPI/VCI\n";
1157
1158         if (v == SEQ_START_TOKEN)
1159                 seq_puts(seq, lec_banner);
1160         else {
1161                 struct lec_state *state = seq->private;
1162                 struct net_device *dev = state->dev;
1163                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1164
1165                 seq_printf(seq, "%s ", dev->name);
1166                 lec_info(seq, entry);
1167         }
1168         return 0;
1169 }
1170
1171 static const struct seq_operations lec_seq_ops = {
1172         .start = lec_seq_start,
1173         .next = lec_seq_next,
1174         .stop = lec_seq_stop,
1175         .show = lec_seq_show,
1176 };
1177
1178 static int lec_seq_open(struct inode *inode, struct file *file)
1179 {
1180         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1181 }
1182
1183 static const struct file_operations lec_seq_fops = {
1184         .owner = THIS_MODULE,
1185         .open = lec_seq_open,
1186         .read = seq_read,
1187         .llseek = seq_lseek,
1188         .release = seq_release_private,
1189 };
1190 #endif
1191
1192 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1193 {
1194         struct atm_vcc *vcc = ATM_SD(sock);
1195         int err = 0;
1196
1197         switch (cmd) {
1198         case ATMLEC_CTRL:
1199         case ATMLEC_MCAST:
1200         case ATMLEC_DATA:
1201                 if (!capable(CAP_NET_ADMIN))
1202                         return -EPERM;
1203                 break;
1204         default:
1205                 return -ENOIOCTLCMD;
1206         }
1207
1208         switch (cmd) {
1209         case ATMLEC_CTRL:
1210                 err = lecd_attach(vcc, (int)arg);
1211                 if (err >= 0)
1212                         sock->state = SS_CONNECTED;
1213                 break;
1214         case ATMLEC_MCAST:
1215                 err = lec_mcast_attach(vcc, (int)arg);
1216                 break;
1217         case ATMLEC_DATA:
1218                 err = lec_vcc_attach(vcc, (void __user *)arg);
1219                 break;
1220         }
1221
1222         return err;
1223 }
1224
1225 static struct atm_ioctl lane_ioctl_ops = {
1226         .owner = THIS_MODULE,
1227         .ioctl = lane_ioctl,
1228 };
1229
1230 static int __init lane_module_init(void)
1231 {
1232 #ifdef CONFIG_PROC_FS
1233         struct proc_dir_entry *p;
1234
1235         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1236         if (!p) {
1237                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1238                 return -ENOMEM;
1239         }
1240 #endif
1241
1242         register_atm_ioctl(&lane_ioctl_ops);
1243         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1244         return 0;
1245 }
1246
1247 static void __exit lane_module_cleanup(void)
1248 {
1249         int i;
1250         struct lec_priv *priv;
1251
1252         remove_proc_entry("lec", atm_proc_root);
1253
1254         deregister_atm_ioctl(&lane_ioctl_ops);
1255
1256         for (i = 0; i < MAX_LEC_ITF; i++) {
1257                 if (dev_lec[i] != NULL) {
1258                         priv = (struct lec_priv *)dev_lec[i]->priv;
1259                         unregister_netdev(dev_lec[i]);
1260                         free_netdev(dev_lec[i]);
1261                         dev_lec[i] = NULL;
1262                 }
1263         }
1264
1265         return;
1266 }
1267
1268 module_init(lane_module_init);
1269 module_exit(lane_module_cleanup);
1270
1271 /*
1272  * LANE2: 3.1.3, LE_RESOLVE.request
1273  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1274  * If sizeoftlvs == NULL the default TLVs associated with with this
1275  * lec will be used.
1276  * If dst_mac == NULL, targetless LE_ARP will be sent
1277  */
1278 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1279                          u8 **tlvs, u32 *sizeoftlvs)
1280 {
1281         unsigned long flags;
1282         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1283         struct lec_arp_table *table;
1284         struct sk_buff *skb;
1285         int retval;
1286
1287         if (force == 0) {
1288                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1289                 table = lec_arp_find(priv, dst_mac);
1290                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1291                 if (table == NULL)
1292                         return -1;
1293
1294                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1295                 if (*tlvs == NULL)
1296                         return -1;
1297
1298                 *sizeoftlvs = table->sizeoftlvs;
1299
1300                 return 0;
1301         }
1302
1303         if (sizeoftlvs == NULL)
1304                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1305
1306         else {
1307                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1308                 if (skb == NULL)
1309                         return -1;
1310                 skb->len = *sizeoftlvs;
1311                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1312                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1313         }
1314         return retval;
1315 }
1316
1317 /*
1318  * LANE2: 3.1.4, LE_ASSOCIATE.request
1319  * Associate the *tlvs with the *lan_dst address.
1320  * Will overwrite any previous association
1321  * Returns 1 for success, 0 for failure (out of memory)
1322  *
1323  */
1324 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1325                                const u8 *tlvs, u32 sizeoftlvs)
1326 {
1327         int retval;
1328         struct sk_buff *skb;
1329         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1330
1331         if (compare_ether_addr(lan_dst, dev->dev_addr))
1332                 return (0);     /* not our mac address */
1333
1334         kfree(priv->tlvs);      /* NULL if there was no previous association */
1335
1336         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1337         if (priv->tlvs == NULL)
1338                 return (0);
1339         priv->sizeoftlvs = sizeoftlvs;
1340
1341         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1342         if (skb == NULL)
1343                 return 0;
1344         skb->len = sizeoftlvs;
1345         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1346         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1347         if (retval != 0)
1348                 printk("lec.c: lane2_associate_req() failed\n");
1349         /*
1350          * If the previous association has changed we must
1351          * somehow notify other LANE entities about the change
1352          */
1353         return (1);
1354 }
1355
1356 /*
1357  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1358  *
1359  */
1360 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1361                                 const u8 *tlvs, u32 sizeoftlvs)
1362 {
1363 #if 0
1364         int i = 0;
1365 #endif
1366         struct lec_priv *priv = (struct lec_priv *)dev->priv;
1367 #if 0                           /*
1368                                  * Why have the TLVs in LE_ARP entries
1369                                  * since we do not use them? When you
1370                                  * uncomment this code, make sure the
1371                                  * TLVs get freed when entry is killed
1372                                  */
1373         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1374
1375         if (entry == NULL)
1376                 return;         /* should not happen */
1377
1378         kfree(entry->tlvs);
1379
1380         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1381         if (entry->tlvs == NULL)
1382                 return;
1383         entry->sizeoftlvs = sizeoftlvs;
1384 #endif
1385 #if 0
1386         printk("lec.c: lane2_associate_ind()\n");
1387         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1388         while (i < sizeoftlvs)
1389                 printk("%02x ", tlvs[i++]);
1390
1391         printk("\n");
1392 #endif
1393
1394         /* tell MPOA about the TLVs we saw */
1395         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1396                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1397                                                      tlvs, sizeoftlvs);
1398         }
1399         return;
1400 }
1401
1402 /*
1403  * Here starts what used to lec_arpc.c
1404  *
1405  * lec_arpc.c was added here when making
1406  * lane client modular. October 1997
1407  */
1408
1409 #include <linux/types.h>
1410 #include <linux/timer.h>
1411 #include <asm/param.h>
1412 #include <asm/atomic.h>
1413 #include <linux/inetdevice.h>
1414 #include <net/route.h>
1415
1416 #if 0
1417 #define pr_debug(format,args...)
1418 /*
1419 #define pr_debug printk
1420 */
1421 #endif
1422 #define DEBUG_ARP_TABLE 0
1423
1424 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1425
1426 static void lec_arp_check_expire(struct work_struct *work);
1427 static void lec_arp_expire_arp(unsigned long data);
1428
1429 /*
1430  * Arp table funcs
1431  */
1432
1433 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1434
1435 /*
1436  * Initialization of arp-cache
1437  */
1438 static void lec_arp_init(struct lec_priv *priv)
1439 {
1440         unsigned short i;
1441
1442         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1443                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1444         }
1445         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1446         INIT_HLIST_HEAD(&priv->lec_no_forward);
1447         INIT_HLIST_HEAD(&priv->mcast_fwds);
1448         spin_lock_init(&priv->lec_arp_lock);
1449         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1450         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1451 }
1452
1453 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1454 {
1455         if (entry->vcc) {
1456                 struct atm_vcc *vcc = entry->vcc;
1457                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1458                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1459
1460                 vcc->pop = vpriv->old_pop;
1461                 if (vpriv->xoff)
1462                         netif_wake_queue(dev);
1463                 kfree(vpriv);
1464                 vcc->user_back = NULL;
1465                 vcc->push = entry->old_push;
1466                 vcc_release_async(vcc, -EPIPE);
1467                 entry->vcc = NULL;
1468         }
1469         if (entry->recv_vcc) {
1470                 entry->recv_vcc->push = entry->old_recv_push;
1471                 vcc_release_async(entry->recv_vcc, -EPIPE);
1472                 entry->recv_vcc = NULL;
1473         }
1474 }
1475
1476 /*
1477  * Insert entry to lec_arp_table
1478  * LANE2: Add to the end of the list to satisfy 8.1.13
1479  */
1480 static inline void
1481 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1482 {
1483         struct hlist_head *tmp;
1484
1485         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1486         hlist_add_head(&entry->next, tmp);
1487
1488         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1489                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1490                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1491                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1492 }
1493
1494 /*
1495  * Remove entry from lec_arp_table
1496  */
1497 static int
1498 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1499 {
1500         struct hlist_node *node;
1501         struct lec_arp_table *entry;
1502         int i, remove_vcc = 1;
1503
1504         if (!to_remove) {
1505                 return -1;
1506         }
1507
1508         hlist_del(&to_remove->next);
1509         del_timer(&to_remove->timer);
1510
1511         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1512         if (to_remove->status >= ESI_FLUSH_PENDING) {
1513                 /*
1514                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1515                  */
1516                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1517                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1518                                 if (memcmp(to_remove->atm_addr,
1519                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1520                                         remove_vcc = 0;
1521                                         break;
1522                                 }
1523                         }
1524                 }
1525                 if (remove_vcc)
1526                         lec_arp_clear_vccs(to_remove);
1527         }
1528         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1529
1530         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1531                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1532                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1533                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1534         return 0;
1535 }
1536
1537 #if DEBUG_ARP_TABLE
1538 static char *get_status_string(unsigned char st)
1539 {
1540         switch (st) {
1541         case ESI_UNKNOWN:
1542                 return "ESI_UNKNOWN";
1543         case ESI_ARP_PENDING:
1544                 return "ESI_ARP_PENDING";
1545         case ESI_VC_PENDING:
1546                 return "ESI_VC_PENDING";
1547         case ESI_FLUSH_PENDING:
1548                 return "ESI_FLUSH_PENDING";
1549         case ESI_FORWARD_DIRECT:
1550                 return "ESI_FORWARD_DIRECT";
1551         default:
1552                 return "<UNKNOWN>";
1553         }
1554 }
1555
1556 static void dump_arp_table(struct lec_priv *priv)
1557 {
1558         struct hlist_node *node;
1559         struct lec_arp_table *rulla;
1560         char buf[256];
1561         int i, j, offset;
1562
1563         printk("Dump %p:\n", priv);
1564         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1565                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1566                         offset = 0;
1567                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1568                         offset += sprintf(buf + offset, "Mac:");
1569                         for (j = 0; j < ETH_ALEN; j++) {
1570                                 offset += sprintf(buf + offset,
1571                                                   "%2.2x ",
1572                                                   rulla->mac_addr[j] & 0xff);
1573                         }
1574                         offset += sprintf(buf + offset, "Atm:");
1575                         for (j = 0; j < ATM_ESA_LEN; j++) {
1576                                 offset += sprintf(buf + offset,
1577                                                   "%2.2x ",
1578                                                   rulla->atm_addr[j] & 0xff);
1579                         }
1580                         offset += sprintf(buf + offset,
1581                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1582                                           rulla->vcc ? rulla->vcc->vpi : 0,
1583                                           rulla->vcc ? rulla->vcc->vci : 0,
1584                                           rulla->recv_vcc ? rulla->recv_vcc->
1585                                           vpi : 0,
1586                                           rulla->recv_vcc ? rulla->recv_vcc->
1587                                           vci : 0, rulla->last_used,
1588                                           rulla->timestamp, rulla->no_tries);
1589                         offset +=
1590                             sprintf(buf + offset,
1591                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1592                                     rulla->flags, rulla->packets_flooded,
1593                                     get_status_string(rulla->status));
1594                         printk("%s\n", buf);
1595                 }
1596         }
1597
1598         if (!hlist_empty(&priv->lec_no_forward))
1599                 printk("No forward\n");
1600         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1601                 offset = 0;
1602                 offset += sprintf(buf + offset, "Mac:");
1603                 for (j = 0; j < ETH_ALEN; j++) {
1604                         offset += sprintf(buf + offset, "%2.2x ",
1605                                           rulla->mac_addr[j] & 0xff);
1606                 }
1607                 offset += sprintf(buf + offset, "Atm:");
1608                 for (j = 0; j < ATM_ESA_LEN; j++) {
1609                         offset += sprintf(buf + offset, "%2.2x ",
1610                                           rulla->atm_addr[j] & 0xff);
1611                 }
1612                 offset += sprintf(buf + offset,
1613                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1614                                   rulla->vcc ? rulla->vcc->vpi : 0,
1615                                   rulla->vcc ? rulla->vcc->vci : 0,
1616                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1617                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1618                                   rulla->last_used,
1619                                   rulla->timestamp, rulla->no_tries);
1620                 offset += sprintf(buf + offset,
1621                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1622                                   rulla->flags, rulla->packets_flooded,
1623                                   get_status_string(rulla->status));
1624                 printk("%s\n", buf);
1625         }
1626
1627         if (!hlist_empty(&priv->lec_arp_empty_ones))
1628                 printk("Empty ones\n");
1629         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, 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", buf);
1654         }
1655
1656         if (!hlist_empty(&priv->mcast_fwds))
1657                 printk("Multicast Forward VCCs\n");
1658         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, 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\n", buf);
1683         }
1684
1685 }
1686 #else
1687 #define dump_arp_table(priv) do { } while (0)
1688 #endif
1689
1690 /*
1691  * Destruction of arp-cache
1692  */
1693 static void lec_arp_destroy(struct lec_priv *priv)
1694 {
1695         unsigned long flags;
1696         struct hlist_node *node, *next;
1697         struct lec_arp_table *entry;
1698         int i;
1699
1700         cancel_rearming_delayed_work(&priv->lec_arp_work);
1701
1702         /*
1703          * Remove all entries
1704          */
1705
1706         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1707         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1708                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1709                         lec_arp_remove(priv, entry);
1710                         lec_arp_put(entry);
1711                 }
1712                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1713         }
1714
1715         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1716                 del_timer_sync(&entry->timer);
1717                 lec_arp_clear_vccs(entry);
1718                 hlist_del(&entry->next);
1719                 lec_arp_put(entry);
1720         }
1721         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1722
1723         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1724                 del_timer_sync(&entry->timer);
1725                 lec_arp_clear_vccs(entry);
1726                 hlist_del(&entry->next);
1727                 lec_arp_put(entry);
1728         }
1729         INIT_HLIST_HEAD(&priv->lec_no_forward);
1730
1731         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1732                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1733                 lec_arp_clear_vccs(entry);
1734                 hlist_del(&entry->next);
1735                 lec_arp_put(entry);
1736         }
1737         INIT_HLIST_HEAD(&priv->mcast_fwds);
1738         priv->mcast_vcc = NULL;
1739         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1740 }
1741
1742 /*
1743  * Find entry by mac_address
1744  */
1745 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1746                                           const unsigned char *mac_addr)
1747 {
1748         struct hlist_node *node;
1749         struct hlist_head *head;
1750         struct lec_arp_table *entry;
1751
1752         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1753                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1754                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1755
1756         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1757         hlist_for_each_entry(entry, node, head, next) {
1758                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1759                         return entry;
1760                 }
1761         }
1762         return NULL;
1763 }
1764
1765 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1766                                         const unsigned char *mac_addr)
1767 {
1768         struct lec_arp_table *to_return;
1769
1770         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1771         if (!to_return) {
1772                 printk("LEC: Arp entry kmalloc failed\n");
1773                 return NULL;
1774         }
1775         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1776         INIT_HLIST_NODE(&to_return->next);
1777         setup_timer(&to_return->timer, lec_arp_expire_arp,
1778                         (unsigned long)to_return);
1779         to_return->last_used = jiffies;
1780         to_return->priv = priv;
1781         skb_queue_head_init(&to_return->tx_wait);
1782         atomic_set(&to_return->usage, 1);
1783         return to_return;
1784 }
1785
1786 /* Arp sent timer expired */
1787 static void lec_arp_expire_arp(unsigned long data)
1788 {
1789         struct lec_arp_table *entry;
1790
1791         entry = (struct lec_arp_table *)data;
1792
1793         pr_debug("lec_arp_expire_arp\n");
1794         if (entry->status == ESI_ARP_PENDING) {
1795                 if (entry->no_tries <= entry->priv->max_retry_count) {
1796                         if (entry->is_rdesc)
1797                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1798                                              entry->mac_addr, NULL, NULL);
1799                         else
1800                                 send_to_lecd(entry->priv, l_arp_xmt,
1801                                              entry->mac_addr, NULL, NULL);
1802                         entry->no_tries++;
1803                 }
1804                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1805         }
1806 }
1807
1808 /* Unknown/unused vcc expire, remove associated entry */
1809 static void lec_arp_expire_vcc(unsigned long data)
1810 {
1811         unsigned long flags;
1812         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1813         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1814
1815         del_timer(&to_remove->timer);
1816
1817         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1818                 to_remove, priv,
1819                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1820                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1821
1822         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1823         hlist_del(&to_remove->next);
1824         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1825
1826         lec_arp_clear_vccs(to_remove);
1827         lec_arp_put(to_remove);
1828 }
1829
1830 /*
1831  * Expire entries.
1832  * 1. Re-set timer
1833  * 2. For each entry, delete entries that have aged past the age limit.
1834  * 3. For each entry, depending on the status of the entry, perform
1835  *    the following maintenance.
1836  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1837  *       tick_count is above the max_unknown_frame_time, clear
1838  *       the tick_count to zero and clear the packets_flooded counter
1839  *       to zero. This supports the packet rate limit per address
1840  *       while flooding unknowns.
1841  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1842  *       than or equal to the path_switching_delay, change the status
1843  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1844  *       regardless of the progress of the flush protocol.
1845  */
1846 static void lec_arp_check_expire(struct work_struct *work)
1847 {
1848         unsigned long flags;
1849         struct lec_priv *priv =
1850                 container_of(work, struct lec_priv, lec_arp_work.work);
1851         struct hlist_node *node, *next;
1852         struct lec_arp_table *entry;
1853         unsigned long now;
1854         unsigned long time_to_check;
1855         int i;
1856
1857         pr_debug("lec_arp_check_expire %p\n", priv);
1858         now = jiffies;
1859 restart:
1860         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1861         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1862                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1863                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1864                             priv->topology_change)
1865                                 time_to_check = priv->forward_delay_time;
1866                         else
1867                                 time_to_check = priv->aging_time;
1868
1869                         pr_debug("About to expire: %lx - %lx > %lx\n",
1870                                 now, entry->last_used, time_to_check);
1871                         if (time_after(now, entry->last_used + time_to_check)
1872                             && !(entry->flags & LEC_PERMANENT_FLAG)
1873                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1874                                 /* Remove entry */
1875                                 pr_debug("LEC:Entry timed out\n");
1876                                 lec_arp_remove(priv, entry);
1877                                 lec_arp_put(entry);
1878                         } else {
1879                                 /* Something else */
1880                                 if ((entry->status == ESI_VC_PENDING ||
1881                                      entry->status == ESI_ARP_PENDING)
1882                                     && time_after_eq(now,
1883                                                      entry->timestamp +
1884                                                      priv->
1885                                                      max_unknown_frame_time)) {
1886                                         entry->timestamp = jiffies;
1887                                         entry->packets_flooded = 0;
1888                                         if (entry->status == ESI_VC_PENDING)
1889                                                 send_to_lecd(priv, l_svc_setup,
1890                                                              entry->mac_addr,
1891                                                              entry->atm_addr,
1892                                                              NULL);
1893                                 }
1894                                 if (entry->status == ESI_FLUSH_PENDING
1895                                     &&
1896                                     time_after_eq(now, entry->timestamp +
1897                                                   priv->path_switching_delay)) {
1898                                         struct sk_buff *skb;
1899                                         struct atm_vcc *vcc = entry->vcc;
1900
1901                                         lec_arp_hold(entry);
1902                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1903                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1904                                                 lec_send(vcc, skb, entry->priv);
1905                                         entry->last_used = jiffies;
1906                                         entry->status = ESI_FORWARD_DIRECT;
1907                                         lec_arp_put(entry);
1908                                         goto restart;
1909                                 }
1910                         }
1911                 }
1912         }
1913         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1914
1915         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1916 }
1917
1918 /*
1919  * Try to find vcc where mac_address is attached.
1920  *
1921  */
1922 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1923                                        const unsigned char *mac_to_find, int is_rdesc,
1924                                        struct lec_arp_table **ret_entry)
1925 {
1926         unsigned long flags;
1927         struct lec_arp_table *entry;
1928         struct atm_vcc *found;
1929
1930         if (mac_to_find[0] & 0x01) {
1931                 switch (priv->lane_version) {
1932                 case 1:
1933                         return priv->mcast_vcc;
1934                         break;
1935                 case 2: /* LANE2 wants arp for multicast addresses */
1936                         if (!compare_ether_addr(mac_to_find, bus_mac))
1937                                 return priv->mcast_vcc;
1938                         break;
1939                 default:
1940                         break;
1941                 }
1942         }
1943
1944         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1945         entry = lec_arp_find(priv, mac_to_find);
1946
1947         if (entry) {
1948                 if (entry->status == ESI_FORWARD_DIRECT) {
1949                         /* Connection Ok */
1950                         entry->last_used = jiffies;
1951                         lec_arp_hold(entry);
1952                         *ret_entry = entry;
1953                         found = entry->vcc;
1954                         goto out;
1955                 }
1956                 /*
1957                  * If the LE_ARP cache entry is still pending, reset count to 0
1958                  * so another LE_ARP request can be made for this frame.
1959                  */
1960                 if (entry->status == ESI_ARP_PENDING) {
1961                         entry->no_tries = 0;
1962                 }
1963                 /*
1964                  * Data direct VC not yet set up, check to see if the unknown
1965                  * frame count is greater than the limit. If the limit has
1966                  * not been reached, allow the caller to send packet to
1967                  * BUS.
1968                  */
1969                 if (entry->status != ESI_FLUSH_PENDING &&
1970                     entry->packets_flooded <
1971                     priv->maximum_unknown_frame_count) {
1972                         entry->packets_flooded++;
1973                         pr_debug("LEC_ARP: Flooding..\n");
1974                         found = priv->mcast_vcc;
1975                         goto out;
1976                 }
1977                 /*
1978                  * We got here because entry->status == ESI_FLUSH_PENDING
1979                  * or BUS flood limit was reached for an entry which is
1980                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1981                  */
1982                 lec_arp_hold(entry);
1983                 *ret_entry = entry;
1984                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1985                         entry->vcc);
1986                 found = NULL;
1987         } else {
1988                 /* No matching entry was found */
1989                 entry = make_entry(priv, mac_to_find);
1990                 pr_debug("LEC_ARP: Making entry\n");
1991                 if (!entry) {
1992                         found = priv->mcast_vcc;
1993                         goto out;
1994                 }
1995                 lec_arp_add(priv, entry);
1996                 /* We want arp-request(s) to be sent */
1997                 entry->packets_flooded = 1;
1998                 entry->status = ESI_ARP_PENDING;
1999                 entry->no_tries = 1;
2000                 entry->last_used = entry->timestamp = jiffies;
2001                 entry->is_rdesc = is_rdesc;
2002                 if (entry->is_rdesc)
2003                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
2004                                      NULL);
2005                 else
2006                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
2007                 entry->timer.expires = jiffies + (1 * HZ);
2008                 entry->timer.function = lec_arp_expire_arp;
2009                 add_timer(&entry->timer);
2010                 found = priv->mcast_vcc;
2011         }
2012
2013 out:
2014         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2015         return found;
2016 }
2017
2018 static int
2019 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
2020                 unsigned long permanent)
2021 {
2022         unsigned long flags;
2023         struct hlist_node *node, *next;
2024         struct lec_arp_table *entry;
2025         int i;
2026
2027         pr_debug("lec_addr_delete\n");
2028         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2029         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2030                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2031                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2032                             && (permanent ||
2033                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2034                                 lec_arp_remove(priv, entry);
2035                                 lec_arp_put(entry);
2036                         }
2037                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2038                         return 0;
2039                 }
2040         }
2041         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2042         return -1;
2043 }
2044
2045 /*
2046  * Notifies:  Response to arp_request (atm_addr != NULL)
2047  */
2048 static void
2049 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2050                const unsigned char *atm_addr, unsigned long remoteflag,
2051                unsigned int targetless_le_arp)
2052 {
2053         unsigned long flags;
2054         struct hlist_node *node, *next;
2055         struct lec_arp_table *entry, *tmp;
2056         int i;
2057
2058         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2059         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2060                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2061                 mac_addr[4], mac_addr[5]);
2062
2063         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2064         entry = lec_arp_find(priv, mac_addr);
2065         if (entry == NULL && targetless_le_arp)
2066                 goto out;       /*
2067                                  * LANE2: ignore targetless LE_ARPs for which
2068                                  * we have no entry in the cache. 7.1.30
2069                                  */
2070         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2071                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2072                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2073                                 hlist_del(&entry->next);
2074                                 del_timer(&entry->timer);
2075                                 tmp = lec_arp_find(priv, mac_addr);
2076                                 if (tmp) {
2077                                         del_timer(&tmp->timer);
2078                                         tmp->status = ESI_FORWARD_DIRECT;
2079                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2080                                         tmp->vcc = entry->vcc;
2081                                         tmp->old_push = entry->old_push;
2082                                         tmp->last_used = jiffies;
2083                                         del_timer(&entry->timer);
2084                                         lec_arp_put(entry);
2085                                         entry = tmp;
2086                                 } else {
2087                                         entry->status = ESI_FORWARD_DIRECT;
2088                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2089                                         entry->last_used = jiffies;
2090                                         lec_arp_add(priv, entry);
2091                                 }
2092                                 if (remoteflag)
2093                                         entry->flags |= LEC_REMOTE_FLAG;
2094                                 else
2095                                         entry->flags &= ~LEC_REMOTE_FLAG;
2096                                 pr_debug("After update\n");
2097                                 dump_arp_table(priv);
2098                                 goto out;
2099                         }
2100                 }
2101         }
2102
2103         entry = lec_arp_find(priv, mac_addr);
2104         if (!entry) {
2105                 entry = make_entry(priv, mac_addr);
2106                 if (!entry)
2107                         goto out;
2108                 entry->status = ESI_UNKNOWN;
2109                 lec_arp_add(priv, entry);
2110                 /* Temporary, changes before end of function */
2111         }
2112         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2113         del_timer(&entry->timer);
2114         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2115                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2116                         if (entry != tmp &&
2117                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2118                                 /* Vcc to this host exists */
2119                                 if (tmp->status > ESI_VC_PENDING) {
2120                                         /*
2121                                          * ESI_FLUSH_PENDING,
2122                                          * ESI_FORWARD_DIRECT
2123                                          */
2124                                         entry->vcc = tmp->vcc;
2125                                         entry->old_push = tmp->old_push;
2126                                 }
2127                                 entry->status = tmp->status;
2128                                 break;
2129                         }
2130                 }
2131         }
2132         if (remoteflag)
2133                 entry->flags |= LEC_REMOTE_FLAG;
2134         else
2135                 entry->flags &= ~LEC_REMOTE_FLAG;
2136         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2137                 entry->status = ESI_VC_PENDING;
2138                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2139         }
2140         pr_debug("After update2\n");
2141         dump_arp_table(priv);
2142 out:
2143         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2144 }
2145
2146 /*
2147  * Notifies: Vcc setup ready
2148  */
2149 static void
2150 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2151               struct atm_vcc *vcc,
2152               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2153 {
2154         unsigned long flags;
2155         struct hlist_node *node;
2156         struct lec_arp_table *entry;
2157         int i, found_entry = 0;
2158
2159         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2160         if (ioc_data->receive == 2) {
2161                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2162
2163                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2164 #if 0
2165                 entry = lec_arp_find(priv, bus_mac);
2166                 if (!entry) {
2167                         printk("LEC_ARP: Multicast entry not found!\n");
2168                         goto out;
2169                 }
2170                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2171                 entry->recv_vcc = vcc;
2172                 entry->old_recv_push = old_push;
2173 #endif
2174                 entry = make_entry(priv, bus_mac);
2175                 if (entry == NULL)
2176                         goto out;
2177                 del_timer(&entry->timer);
2178                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2179                 entry->recv_vcc = vcc;
2180                 entry->old_recv_push = old_push;
2181                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2182                 goto out;
2183         } else if (ioc_data->receive == 1) {
2184                 /*
2185                  * Vcc which we don't want to make default vcc,
2186                  * attach it anyway.
2187                  */
2188                 pr_debug
2189                     ("LEC_ARP:Attaching data direct, not default: "
2190                      "%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",
2191                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2192                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2193                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2194                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2195                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2196                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2197                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2198                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2199                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2200                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2201                 entry = make_entry(priv, bus_mac);
2202                 if (entry == NULL)
2203                         goto out;
2204                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2205                 memset(entry->mac_addr, 0, ETH_ALEN);
2206                 entry->recv_vcc = vcc;
2207                 entry->old_recv_push = old_push;
2208                 entry->status = ESI_UNKNOWN;
2209                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2210                 entry->timer.function = lec_arp_expire_vcc;
2211                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2212                 add_timer(&entry->timer);
2213                 dump_arp_table(priv);
2214                 goto out;
2215         }
2216         pr_debug
2217             ("LEC_ARP:Attaching data direct, default: "
2218              "%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",
2219              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2220              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2221              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2222              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2223              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2224              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2225              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2226              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2227              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2228              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2229         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2230                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2231                         if (memcmp
2232                             (ioc_data->atm_addr, entry->atm_addr,
2233                              ATM_ESA_LEN) == 0) {
2234                                 pr_debug("LEC_ARP: Attaching data direct\n");
2235                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2236                                         entry->vcc ? entry->vcc->vci : 0,
2237                                         entry->recv_vcc ? entry->recv_vcc->
2238                                         vci : 0);
2239                                 found_entry = 1;
2240                                 del_timer(&entry->timer);
2241                                 entry->vcc = vcc;
2242                                 entry->old_push = old_push;
2243                                 if (entry->status == ESI_VC_PENDING) {
2244                                         if (priv->maximum_unknown_frame_count
2245                                             == 0)
2246                                                 entry->status =
2247                                                     ESI_FORWARD_DIRECT;
2248                                         else {
2249                                                 entry->timestamp = jiffies;
2250                                                 entry->status =
2251                                                     ESI_FLUSH_PENDING;
2252 #if 0
2253                                                 send_to_lecd(priv, l_flush_xmt,
2254                                                              NULL,
2255                                                              entry->atm_addr,
2256                                                              NULL);
2257 #endif
2258                                         }
2259                                 } else {
2260                                         /*
2261                                          * They were forming a connection
2262                                          * to us, and we to them. Our
2263                                          * ATM address is numerically lower
2264                                          * than theirs, so we make connection
2265                                          * we formed into default VCC (8.1.11).
2266                                          * Connection they made gets torn
2267                                          * down. This might confuse some
2268                                          * clients. Can be changed if
2269                                          * someone reports trouble...
2270                                          */
2271                                         ;
2272                                 }
2273                         }
2274                 }
2275         }
2276         if (found_entry) {
2277                 pr_debug("After vcc was added\n");
2278                 dump_arp_table(priv);
2279                 goto out;
2280         }
2281         /*
2282          * Not found, snatch address from first data packet that arrives
2283          * from this vcc
2284          */
2285         entry = make_entry(priv, bus_mac);
2286         if (!entry)
2287                 goto out;
2288         entry->vcc = vcc;
2289         entry->old_push = old_push;
2290         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2291         memset(entry->mac_addr, 0, ETH_ALEN);
2292         entry->status = ESI_UNKNOWN;
2293         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2294         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2295         entry->timer.function = lec_arp_expire_vcc;
2296         add_timer(&entry->timer);
2297         pr_debug("After vcc was added\n");
2298         dump_arp_table(priv);
2299 out:
2300         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2301 }
2302
2303 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2304 {
2305         unsigned long flags;
2306         struct hlist_node *node;
2307         struct lec_arp_table *entry;
2308         int i;
2309
2310         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2311 restart:
2312         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2313         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2314                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2315                         if (entry->flush_tran_id == tran_id
2316                             && entry->status == ESI_FLUSH_PENDING) {
2317                                 struct sk_buff *skb;
2318                                 struct atm_vcc *vcc = entry->vcc;
2319
2320                                 lec_arp_hold(entry);
2321                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2322                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2323                                         lec_send(vcc, skb, entry->priv);
2324                                 entry->last_used = jiffies;
2325                                 entry->status = ESI_FORWARD_DIRECT;
2326                                 lec_arp_put(entry);
2327                                 pr_debug("LEC_ARP: Flushed\n");
2328                                 goto restart;
2329                         }
2330                 }
2331         }
2332         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2333         dump_arp_table(priv);
2334 }
2335
2336 static void
2337 lec_set_flush_tran_id(struct lec_priv *priv,
2338                       const unsigned char *atm_addr, unsigned long tran_id)
2339 {
2340         unsigned long flags;
2341         struct hlist_node *node;
2342         struct lec_arp_table *entry;
2343         int i;
2344
2345         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2346         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2347                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2348                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2349                                 entry->flush_tran_id = tran_id;
2350                                 pr_debug("Set flush transaction id to %lx for %p\n",
2351                                         tran_id, entry);
2352                         }
2353                 }
2354         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2355 }
2356
2357 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2358 {
2359         unsigned long flags;
2360         unsigned char mac_addr[] = {
2361                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2362         };
2363         struct lec_arp_table *to_add;
2364         struct lec_vcc_priv *vpriv;
2365         int err = 0;
2366
2367         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2368                 return -ENOMEM;
2369         vpriv->xoff = 0;
2370         vpriv->old_pop = vcc->pop;
2371         vcc->user_back = vpriv;
2372         vcc->pop = lec_pop;
2373         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2374         to_add = make_entry(priv, mac_addr);
2375         if (!to_add) {
2376                 vcc->pop = vpriv->old_pop;
2377                 kfree(vpriv);
2378                 err = -ENOMEM;
2379                 goto out;
2380         }
2381         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2382         to_add->status = ESI_FORWARD_DIRECT;
2383         to_add->flags |= LEC_PERMANENT_FLAG;
2384         to_add->vcc = vcc;
2385         to_add->old_push = vcc->push;
2386         vcc->push = lec_push;
2387         priv->mcast_vcc = vcc;
2388         lec_arp_add(priv, to_add);
2389 out:
2390         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2391         return err;
2392 }
2393
2394 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2395 {
2396         unsigned long flags;
2397         struct hlist_node *node, *next;
2398         struct lec_arp_table *entry;
2399         int i;
2400
2401         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2402         dump_arp_table(priv);
2403
2404         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2405
2406         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2407                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2408                         if (vcc == entry->vcc) {
2409                                 lec_arp_remove(priv, entry);
2410                                 lec_arp_put(entry);
2411                                 if (priv->mcast_vcc == vcc) {
2412                                         priv->mcast_vcc = NULL;
2413                                 }
2414                         }
2415                 }
2416         }
2417
2418         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2419                 if (entry->vcc == vcc) {
2420                         lec_arp_clear_vccs(entry);
2421                         del_timer(&entry->timer);
2422                         hlist_del(&entry->next);
2423                         lec_arp_put(entry);
2424                 }
2425         }
2426
2427         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2428                 if (entry->recv_vcc == vcc) {
2429                         lec_arp_clear_vccs(entry);
2430                         del_timer(&entry->timer);
2431                         hlist_del(&entry->next);
2432                         lec_arp_put(entry);
2433                 }
2434         }
2435
2436         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2437                 if (entry->recv_vcc == vcc) {
2438                         lec_arp_clear_vccs(entry);
2439                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2440                         hlist_del(&entry->next);
2441                         lec_arp_put(entry);
2442                 }
2443         }
2444
2445         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2446         dump_arp_table(priv);
2447 }
2448
2449 static void
2450 lec_arp_check_empties(struct lec_priv *priv,
2451                       struct atm_vcc *vcc, struct sk_buff *skb)
2452 {
2453         unsigned long flags;
2454         struct hlist_node *node, *next;
2455         struct lec_arp_table *entry, *tmp;
2456         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2457         unsigned char *src;
2458 #ifdef CONFIG_TR
2459         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2460
2461         if (priv->is_trdev)
2462                 src = tr_hdr->h_source;
2463         else
2464 #endif
2465                 src = hdr->h_source;
2466
2467         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2468         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2469                 if (vcc == entry->vcc) {
2470                         del_timer(&entry->timer);
2471                         memcpy(entry->mac_addr, src, ETH_ALEN);
2472                         entry->status = ESI_FORWARD_DIRECT;
2473                         entry->last_used = jiffies;
2474                         /* We might have got an entry */
2475                         if ((tmp = lec_arp_find(priv, src))) {
2476                                 lec_arp_remove(priv, tmp);
2477                                 lec_arp_put(tmp);
2478                         }
2479                         hlist_del(&entry->next);
2480                         lec_arp_add(priv, entry);
2481                         goto out;
2482                 }
2483         }
2484         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2485 out:
2486         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2487 }
2488
2489 MODULE_LICENSE("GPL");