lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9 #include <linux/slab.h>
  10 #include <linux/kernel.h>
  11 #include <linux/bitops.h>
  12 #include <linux/capability.h>
  13
  14 /* We are ethernet device */
  15 #include <linux/if_ether.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <net/sock.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/ip.h>
  21 #include <asm/byteorder.h>
  22 #include <linux/uaccess.h>
  23 #include <net/arp.h>
  24 #include <net/dst.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/seq_file.h>
  28
  29 /* And atm device */
  30 #include <linux/atmdev.h>
  31 #include <linux/atmlec.h>
  32
  33 /* Proxy LEC knows about bridging */
  34 #if IS_ENABLED(CONFIG_BRIDGE)
  35 #include "../bridge/br_private.h"
  36
  37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  38 #endif
  39
  40 /* Modular too */
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43
  44 /* Hardening for Spectre-v1 */
  45 #include <linux/nospec.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 netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  64                                   struct net_device *dev);
  65 static int lec_close(struct net_device *dev);
  66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  67                                           const unsigned char *mac_addr);
  68 static int lec_arp_remove(struct lec_priv *priv,
  69                           struct lec_arp_table *to_remove);
  70 /* LANE2 functions */
  71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  72                                 const u8 *tlvs, u32 sizeoftlvs);
  73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  74                          u8 **tlvs, u32 *sizeoftlvs);
  75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  76                                const u8 *tlvs, u32 sizeoftlvs);
  77
  78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  79                            unsigned long permanent);
  80 static void lec_arp_check_empties(struct lec_priv *priv,
  81                                   struct atm_vcc *vcc, struct sk_buff *skb);
  82 static void lec_arp_destroy(struct lec_priv *priv);
  83 static void lec_arp_init(struct lec_priv *priv);
  84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  85                                        const unsigned char *mac_to_find,
  86                                        int is_rdesc,
  87                                        struct lec_arp_table **ret_entry);
  88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  89                            const unsigned char *atm_addr,
  90                            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,
  98                           const struct atmlec_ioc *ioc_data,
  99                           struct atm_vcc *vcc,
 100                           void (*old_push)(struct atm_vcc *vcc,
 101                                            struct sk_buff *skb));
 102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 103
 104 /* must be done under lec_arp_lock */
 105 static inline void lec_arp_hold(struct lec_arp_table *entry)
 106 {
 107         refcount_inc(&entry->usage);
 108 }
 109
 110 static inline void lec_arp_put(struct lec_arp_table *entry)
 111 {
 112         if (refcount_dec_and_test(&entry->usage))
 113                 kfree(entry);
 114 }
 115
 116 static struct lane2_ops lane2_ops = {
 117         .resolve = lane2_resolve,               /* spec 3.1.3 */
 118         .associate_req = lane2_associate_req,   /* spec 3.1.4 */
 119         .associate_indicator = NULL             /* 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 IS_ENABLED(CONFIG_BRIDGE)
 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         char *buff;
 131         struct lec_priv *priv;
 132
 133         /*
 134          * Check if this is a BPDU. If so, ask zeppelin to send
 135          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 136          * as the Config BPDU has
 137          */
 138         buff = skb->data + skb->dev->hard_header_len;
 139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 140                 struct sock *sk;
 141                 struct sk_buff *skb2;
 142                 struct atmlec_msg *mesg;
 143
 144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 145                 if (skb2 == NULL)
 146                         return;
 147                 skb2->len = sizeof(struct atmlec_msg);
 148                 mesg = (struct atmlec_msg *)skb2->data;
 149                 mesg->type = l_topology_change;
 150                 buff += 4;
 151                 mesg->content.normal.flag = *buff & 0x01;
 152                                         /* 0x01 is topology change */
 153
 154                 priv = netdev_priv(dev);
 155                 atm_force_charge(priv->lecd, skb2->truesize);
 156                 sk = sk_atm(priv->lecd);
 157                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 158                 sk->sk_data_ready(sk);
 159         }
 160 }
 161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 162
 163 /*
 164  * Open/initialize the netdevice. This is called (in the current kernel)
 165  * sometime after booting when the 'ifconfig' program is run.
 166  *
 167  * This routine should set everything up anew at each open, even
 168  * registers that "should" only need to be set once at boot, so that
 169  * there is non-reboot way to recover if something goes wrong.
 170  */
 171
 172 static int lec_open(struct net_device *dev)
 173 {
 174         netif_start_queue(dev);
 175
 176         return 0;
 177 }
 178
 179 static void
 180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 181 {
 182         struct net_device *dev = skb->dev;
 183
 184         ATM_SKB(skb)->vcc = vcc;
 185         atm_account_tx(vcc, skb);
 186
 187         if (vcc->send(vcc, skb) < 0) {
 188                 dev->stats.tx_dropped++;
 189                 return;
 190         }
 191
 192         dev->stats.tx_packets++;
 193         dev->stats.tx_bytes += skb->len;
 194 }
 195
 196 static void lec_tx_timeout(struct net_device *dev)
 197 {
 198         pr_info("%s\n", dev->name);
 199         netif_trans_update(dev);
 200         netif_wake_queue(dev);
 201 }
 202
 203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 204                                   struct net_device *dev)
 205 {
 206         struct sk_buff *skb2;
 207         struct lec_priv *priv = netdev_priv(dev);
 208         struct lecdatahdr_8023 *lec_h;
 209         struct atm_vcc *vcc;
 210         struct lec_arp_table *entry;
 211         unsigned char *dst;
 212         int min_frame_size;
 213         int is_rdesc;
 214
 215         pr_debug("called\n");
 216         if (!priv->lecd) {
 217                 pr_info("%s:No lecd attached\n", dev->name);
 218                 dev->stats.tx_errors++;
 219                 netif_stop_queue(dev);
 220                 kfree_skb(skb);
 221                 return NETDEV_TX_OK;
 222         }
 223
 224         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 225                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 226                  (long)skb_end_pointer(skb));
 227 #if IS_ENABLED(CONFIG_BRIDGE)
 228         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 229                 lec_handle_bridge(skb, dev);
 230 #endif
 231
 232         /* Make sure we have room for lec_id */
 233         if (skb_headroom(skb) < 2) {
 234                 pr_debug("reallocating skb\n");
 235                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 236                 if (unlikely(!skb2)) {
 237                         kfree_skb(skb);
 238                         return NETDEV_TX_OK;
 239                 }
 240                 consume_skb(skb);
 241                 skb = skb2;
 242         }
 243         skb_push(skb, 2);
 244
 245         /* Put le header to place */
 246         lec_h = (struct lecdatahdr_8023 *)skb->data;
 247         lec_h->le_header = htons(priv->lecid);
 248
 249 #if DUMP_PACKETS >= 2
 250 #define MAX_DUMP_SKB 99
 251 #elif DUMP_PACKETS >= 1
 252 #define MAX_DUMP_SKB 30
 253 #endif
 254 #if DUMP_PACKETS >= 1
 255         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 256                dev->name, skb->len, priv->lecid);
 257         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 258                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 259 #endif /* DUMP_PACKETS >= 1 */
 260
 261         /* Minimum ethernet-frame size */
 262         min_frame_size = LEC_MINIMUM_8023_SIZE;
 263         if (skb->len < min_frame_size) {
 264                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 265                         skb2 = skb_copy_expand(skb, 0,
 266                                                min_frame_size - skb->truesize,
 267                                                GFP_ATOMIC);
 268                         dev_kfree_skb(skb);
 269                         if (skb2 == NULL) {
 270                                 dev->stats.tx_dropped++;
 271                                 return NETDEV_TX_OK;
 272                         }
 273                         skb = skb2;
 274                 }
 275                 skb_put(skb, min_frame_size - skb->len);
 276         }
 277
 278         /* Send to right vcc */
 279         is_rdesc = 0;
 280         dst = lec_h->h_dest;
 281         entry = NULL;
 282         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 283         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 284                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 285         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 286                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 287                         pr_debug("%s:queuing packet, MAC address %pM\n",
 288                                  dev->name, lec_h->h_dest);
 289                         skb_queue_tail(&entry->tx_wait, skb);
 290                 } else {
 291                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 292                                  dev->name, lec_h->h_dest);
 293                         dev->stats.tx_dropped++;
 294                         dev_kfree_skb(skb);
 295                 }
 296                 goto out;
 297         }
 298 #if DUMP_PACKETS > 0
 299         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 300                dev->name, vcc->vpi, vcc->vci);
 301 #endif /* DUMP_PACKETS > 0 */
 302
 303         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 304                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 305                 lec_send(vcc, skb2);
 306         }
 307
 308         lec_send(vcc, skb);
 309
 310         if (!atm_may_send(vcc, 0)) {
 311                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 312
 313                 vpriv->xoff = 1;
 314                 netif_stop_queue(dev);
 315
 316                 /*
 317                  * vcc->pop() might have occurred in between, making
 318                  * the vcc usuable again.  Since xmit is serialized,
 319                  * this is the only situation we have to re-test.
 320                  */
 321
 322                 if (atm_may_send(vcc, 0))
 323                         netif_wake_queue(dev);
 324         }
 325
 326 out:
 327         if (entry)
 328                 lec_arp_put(entry);
 329         netif_trans_update(dev);
 330         return NETDEV_TX_OK;
 331 }
 332
 333 /* The inverse routine to net_open(). */
 334 static int lec_close(struct net_device *dev)
 335 {
 336         netif_stop_queue(dev);
 337         return 0;
 338 }
 339
 340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 341 {
 342         unsigned long flags;
 343         struct net_device *dev = (struct net_device *)vcc->proto_data;
 344         struct lec_priv *priv = netdev_priv(dev);
 345         struct atmlec_msg *mesg;
 346         struct lec_arp_table *entry;
 347         int i;
 348         char *tmp;              /* FIXME */
 349
 350         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 351         mesg = (struct atmlec_msg *)skb->data;
 352         tmp = skb->data;
 353         tmp += sizeof(struct atmlec_msg);
 354         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 355         switch (mesg->type) {
 356         case l_set_mac_addr:
 357                 for (i = 0; i < 6; i++)
 358                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 359                 break;
 360         case l_del_mac_addr:
 361                 for (i = 0; i < 6; i++)
 362                         dev->dev_addr[i] = 0;
 363                 break;
 364         case l_addr_delete:
 365                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 366                                 mesg->content.normal.flag);
 367                 break;
 368         case l_topology_change:
 369                 priv->topology_change = mesg->content.normal.flag;
 370                 break;
 371         case l_flush_complete:
 372                 lec_flush_complete(priv, mesg->content.normal.flag);
 373                 break;
 374         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 375                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 376                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 377                 lec_arp_remove(priv, entry);
 378                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 379
 380                 if (mesg->content.normal.no_source_le_narp)
 381                         break;
 382                 /* FALL THROUGH */
 383         case l_arp_update:
 384                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 385                                mesg->content.normal.atm_addr,
 386                                mesg->content.normal.flag,
 387                                mesg->content.normal.targetless_le_arp);
 388                 pr_debug("in l_arp_update\n");
 389                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 390                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 391                                  mesg->sizeoftlvs);
 392                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 393                                             tmp, mesg->sizeoftlvs);
 394                 }
 395                 break;
 396         case l_config:
 397                 priv->maximum_unknown_frame_count =
 398                     mesg->content.config.maximum_unknown_frame_count;
 399                 priv->max_unknown_frame_time =
 400                     (mesg->content.config.max_unknown_frame_time * HZ);
 401                 priv->max_retry_count = mesg->content.config.max_retry_count;
 402                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 403                 priv->forward_delay_time =
 404                     (mesg->content.config.forward_delay_time * HZ);
 405                 priv->arp_response_time =
 406                     (mesg->content.config.arp_response_time * HZ);
 407                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 408                 priv->path_switching_delay =
 409                     (mesg->content.config.path_switching_delay * HZ);
 410                 priv->lane_version = mesg->content.config.lane_version;
 411                                         /* LANE2 */
 412                 priv->lane2_ops = NULL;
 413                 if (priv->lane_version > 1)
 414                         priv->lane2_ops = &lane2_ops;
 415                 rtnl_lock();
 416                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 417                         pr_info("%s: change_mtu to %d failed\n",
 418                                 dev->name, mesg->content.config.mtu);
 419                 rtnl_unlock();
 420                 priv->is_proxy = mesg->content.config.is_proxy;
 421                 break;
 422         case l_flush_tran_id:
 423                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 424                                       mesg->content.normal.flag);
 425                 break;
 426         case l_set_lecid:
 427                 priv->lecid =
 428                     (unsigned short)(0xffff & mesg->content.normal.flag);
 429                 break;
 430         case l_should_bridge:
 431 #if IS_ENABLED(CONFIG_BRIDGE)
 432         {
 433                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 434                          dev->name, mesg->content.proxy.mac_addr);
 435
 436                 if (br_fdb_test_addr_hook == NULL)
 437                         break;
 438
 439                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 440                         /* hit from bridge table, send LE_ARP_RESPONSE */
 441                         struct sk_buff *skb2;
 442                         struct sock *sk;
 443
 444                         pr_debug("%s: entry found, responding to zeppelin\n",
 445                                  dev->name);
 446                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 447                         if (skb2 == NULL)
 448                                 break;
 449                         skb2->len = sizeof(struct atmlec_msg);
 450                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 451                         atm_force_charge(priv->lecd, skb2->truesize);
 452                         sk = sk_atm(priv->lecd);
 453                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 454                         sk->sk_data_ready(sk);
 455                 }
 456         }
 457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 458                 break;
 459         default:
 460                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 461                 dev_kfree_skb(skb);
 462                 return -EINVAL;
 463         }
 464         dev_kfree_skb(skb);
 465         return 0;
 466 }
 467
 468 static void lec_atm_close(struct atm_vcc *vcc)
 469 {
 470         struct sk_buff *skb;
 471         struct net_device *dev = (struct net_device *)vcc->proto_data;
 472         struct lec_priv *priv = netdev_priv(dev);
 473
 474         priv->lecd = NULL;
 475         /* Do something needful? */
 476
 477         netif_stop_queue(dev);
 478         lec_arp_destroy(priv);
 479
 480         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 481                 pr_info("%s closing with messages pending\n", dev->name);
 482         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 483                 atm_return(vcc, skb->truesize);
 484                 dev_kfree_skb(skb);
 485         }
 486
 487         pr_info("%s: Shut down!\n", dev->name);
 488         module_put(THIS_MODULE);
 489 }
 490
 491 static const struct atmdev_ops lecdev_ops = {
 492         .close = lec_atm_close,
 493         .send = lec_atm_send
 494 };
 495
 496 static struct atm_dev lecatm_dev = {
 497         .ops = &lecdev_ops,
 498         .type = "lec",
 499         .number = 999,          /* dummy device number */
 500         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 501 };
 502
 503 /*
 504  * LANE2: new argument struct sk_buff *data contains
 505  * the LE_ARP based TLVs introduced in the LANE2 spec
 506  */
 507 static int
 508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 509              const unsigned char *mac_addr, const unsigned char *atm_addr,
 510              struct sk_buff *data)
 511 {
 512         struct sock *sk;
 513         struct sk_buff *skb;
 514         struct atmlec_msg *mesg;
 515
 516         if (!priv || !priv->lecd)
 517                 return -1;
 518         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 519         if (!skb)
 520                 return -1;
 521         skb->len = sizeof(struct atmlec_msg);
 522         mesg = (struct atmlec_msg *)skb->data;
 523         memset(mesg, 0, sizeof(struct atmlec_msg));
 524         mesg->type = type;
 525         if (data != NULL)
 526                 mesg->sizeoftlvs = data->len;
 527         if (mac_addr)
 528                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 529         else
 530                 mesg->content.normal.targetless_le_arp = 1;
 531         if (atm_addr)
 532                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 533
 534         atm_force_charge(priv->lecd, skb->truesize);
 535         sk = sk_atm(priv->lecd);
 536         skb_queue_tail(&sk->sk_receive_queue, skb);
 537         sk->sk_data_ready(sk);
 538
 539         if (data != NULL) {
 540                 pr_debug("about to send %d bytes of data\n", data->len);
 541                 atm_force_charge(priv->lecd, data->truesize);
 542                 skb_queue_tail(&sk->sk_receive_queue, data);
 543                 sk->sk_data_ready(sk);
 544         }
 545
 546         return 0;
 547 }
 548
 549 static void lec_set_multicast_list(struct net_device *dev)
 550 {
 551         /*
 552          * by default, all multicast frames arrive over the bus.
 553          * eventually support selective multicast service
 554          */
 555 }
 556
 557 static const struct net_device_ops lec_netdev_ops = {
 558         .ndo_open               = lec_open,
 559         .ndo_stop               = lec_close,
 560         .ndo_start_xmit         = lec_start_xmit,
 561         .ndo_tx_timeout         = lec_tx_timeout,
 562         .ndo_set_rx_mode        = lec_set_multicast_list,
 563 };
 564
 565 static const unsigned char lec_ctrl_magic[] = {
 566         0xff,
 567         0x00,
 568         0x01,
 569         0x01
 570 };
 571
 572 #define LEC_DATA_DIRECT_8023  2
 573 #define LEC_DATA_DIRECT_8025  3
 574
 575 static int lec_is_data_direct(struct atm_vcc *vcc)
 576 {
 577         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 578                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 579 }
 580
 581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 582 {
 583         unsigned long flags;
 584         struct net_device *dev = (struct net_device *)vcc->proto_data;
 585         struct lec_priv *priv = netdev_priv(dev);
 586
 587 #if DUMP_PACKETS > 0
 588         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 589                dev->name, vcc->vpi, vcc->vci);
 590 #endif
 591         if (!skb) {
 592                 pr_debug("%s: null skb\n", dev->name);
 593                 lec_vcc_close(priv, vcc);
 594                 return;
 595         }
 596 #if DUMP_PACKETS >= 2
 597 #define MAX_SKB_DUMP 99
 598 #elif DUMP_PACKETS >= 1
 599 #define MAX_SKB_DUMP 30
 600 #endif
 601 #if DUMP_PACKETS > 0
 602         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 603                dev->name, skb->len, priv->lecid);
 604         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 605                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 606 #endif /* DUMP_PACKETS > 0 */
 607         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 608                                 /* Control frame, to daemon */
 609                 struct sock *sk = sk_atm(vcc);
 610
 611                 pr_debug("%s: To daemon\n", dev->name);
 612                 skb_queue_tail(&sk->sk_receive_queue, skb);
 613                 sk->sk_data_ready(sk);
 614         } else {                /* Data frame, queue to protocol handlers */
 615                 struct lec_arp_table *entry;
 616                 unsigned char *src, *dst;
 617
 618                 atm_return(vcc, skb->truesize);
 619                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 620                     !priv->lecd || !(dev->flags & IFF_UP)) {
 621                         /*
 622                          * Probably looping back, or if lecd is missing,
 623                          * lecd has gone down
 624                          */
 625                         pr_debug("Ignoring frame...\n");
 626                         dev_kfree_skb(skb);
 627                         return;
 628                 }
 629                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 630
 631                 /*
 632                  * If this is a Data Direct VCC, and the VCC does not match
 633                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 634                  */
 635                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 636                 if (lec_is_data_direct(vcc)) {
 637                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 638                         entry = lec_arp_find(priv, src);
 639                         if (entry && entry->vcc != vcc) {
 640                                 lec_arp_remove(priv, entry);
 641                                 lec_arp_put(entry);
 642                         }
 643                 }
 644                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 645
 646                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 647                     !priv->is_proxy &&  /* Proxy wants all the packets */
 648                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 649                         dev_kfree_skb(skb);
 650                         return;
 651                 }
 652                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 653                         lec_arp_check_empties(priv, vcc, skb);
 654                 skb_pull(skb, 2);       /* skip lec_id */
 655                 skb->protocol = eth_type_trans(skb, dev);
 656                 dev->stats.rx_packets++;
 657                 dev->stats.rx_bytes += skb->len;
 658                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 659                 netif_rx(skb);
 660         }
 661 }
 662
 663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 664 {
 665         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 666         struct net_device *dev = skb->dev;
 667
 668         if (vpriv == NULL) {
 669                 pr_info("vpriv = NULL!?!?!?\n");
 670                 return;
 671         }
 672
 673         vpriv->old_pop(vcc, skb);
 674
 675         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 676                 vpriv->xoff = 0;
 677                 if (netif_running(dev) && netif_queue_stopped(dev))
 678                         netif_wake_queue(dev);
 679         }
 680 }
 681
 682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 683 {
 684         struct lec_vcc_priv *vpriv;
 685         int bytes_left;
 686         struct atmlec_ioc ioc_data;
 687
 688         /* Lecd must be up in this case */
 689         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 690         if (bytes_left != 0)
 691                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 692         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 693                 return -EINVAL;
 694         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 695         if (!dev_lec[ioc_data.dev_num])
 696                 return -EINVAL;
 697         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 698         if (!vpriv)
 699                 return -ENOMEM;
 700         vpriv->xoff = 0;
 701         vpriv->old_pop = vcc->pop;
 702         vcc->user_back = vpriv;
 703         vcc->pop = lec_pop;
 704         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 705                       &ioc_data, vcc, vcc->push);
 706         vcc->proto_data = dev_lec[ioc_data.dev_num];
 707         vcc->push = lec_push;
 708         return 0;
 709 }
 710
 711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 712 {
 713         if (arg < 0 || arg >= MAX_LEC_ITF)
 714                 return -EINVAL;
 715         arg = array_index_nospec(arg, MAX_LEC_ITF);
 716         if (!dev_lec[arg])
 717                 return -EINVAL;
 718         vcc->proto_data = dev_lec[arg];
 719         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 720 }
 721
 722 /* Initialize device. */
 723 static int lecd_attach(struct atm_vcc *vcc, int arg)
 724 {
 725         int i;
 726         struct lec_priv *priv;
 727
 728         if (arg < 0)
 729                 i = 0;
 730         else
 731                 i = arg;
 732         if (arg >= MAX_LEC_ITF)
 733                 return -EINVAL;
 734         i = array_index_nospec(arg, MAX_LEC_ITF);
 735         if (!dev_lec[i]) {
 736                 int size;
 737
 738                 size = sizeof(struct lec_priv);
 739                 dev_lec[i] = alloc_etherdev(size);
 740                 if (!dev_lec[i])
 741                         return -ENOMEM;
 742                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 743                 dev_lec[i]->max_mtu = 18190;
 744                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 745                 if (register_netdev(dev_lec[i])) {
 746                         free_netdev(dev_lec[i]);
 747                         return -EINVAL;
 748                 }
 749
 750                 priv = netdev_priv(dev_lec[i]);
 751         } else {
 752                 priv = netdev_priv(dev_lec[i]);
 753                 if (priv->lecd)
 754                         return -EADDRINUSE;
 755         }
 756         lec_arp_init(priv);
 757         priv->itfnum = i;       /* LANE2 addition */
 758         priv->lecd = vcc;
 759         vcc->dev = &lecatm_dev;
 760         vcc_insert_socket(sk_atm(vcc));
 761
 762         vcc->proto_data = dev_lec[i];
 763         set_bit(ATM_VF_META, &vcc->flags);
 764         set_bit(ATM_VF_READY, &vcc->flags);
 765
 766         /* Set default values to these variables */
 767         priv->maximum_unknown_frame_count = 1;
 768         priv->max_unknown_frame_time = (1 * HZ);
 769         priv->vcc_timeout_period = (1200 * HZ);
 770         priv->max_retry_count = 1;
 771         priv->aging_time = (300 * HZ);
 772         priv->forward_delay_time = (15 * HZ);
 773         priv->topology_change = 0;
 774         priv->arp_response_time = (1 * HZ);
 775         priv->flush_timeout = (4 * HZ);
 776         priv->path_switching_delay = (6 * HZ);
 777
 778         if (dev_lec[i]->flags & IFF_UP)
 779                 netif_start_queue(dev_lec[i]);
 780         __module_get(THIS_MODULE);
 781         return i;
 782 }
 783
 784 #ifdef CONFIG_PROC_FS
 785 static const char *lec_arp_get_status_string(unsigned char status)
 786 {
 787         static const char *const lec_arp_status_string[] = {
 788                 "ESI_UNKNOWN       ",
 789                 "ESI_ARP_PENDING   ",
 790                 "ESI_VC_PENDING    ",
 791                 "<Undefined>       ",
 792                 "ESI_FLUSH_PENDING ",
 793                 "ESI_FORWARD_DIRECT"
 794         };
 795
 796         if (status > ESI_FORWARD_DIRECT)
 797                 status = 3;     /* ESI_UNDEFINED */
 798         return lec_arp_status_string[status];
 799 }
 800
 801 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 802 {
 803         int i;
 804
 805         for (i = 0; i < ETH_ALEN; i++)
 806                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 807         seq_printf(seq, " ");
 808         for (i = 0; i < ATM_ESA_LEN; i++)
 809                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 810         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 811                    entry->flags & 0xffff);
 812         if (entry->vcc)
 813                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 814         else
 815                 seq_printf(seq, "        ");
 816         if (entry->recv_vcc) {
 817                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 818                            entry->recv_vcc->vci);
 819         }
 820         seq_putc(seq, '\n');
 821 }
 822
 823 struct lec_state {
 824         unsigned long flags;
 825         struct lec_priv *locked;
 826         struct hlist_node *node;
 827         struct net_device *dev;
 828         int itf;
 829         int arp_table;
 830         int misc_table;
 831 };
 832
 833 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 834                           loff_t *l)
 835 {
 836         struct hlist_node *e = state->node;
 837
 838         if (!e)
 839                 e = tbl->first;
 840         if (e == SEQ_START_TOKEN) {
 841                 e = tbl->first;
 842                 --*l;
 843         }
 844
 845         for (; e; e = e->next) {
 846                 if (--*l < 0)
 847                         break;
 848         }
 849         state->node = e;
 850
 851         return (*l < 0) ? state : NULL;
 852 }
 853
 854 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 855                           struct lec_priv *priv)
 856 {
 857         void *v = NULL;
 858         int p;
 859
 860         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 861                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 862                 if (v)
 863                         break;
 864         }
 865         state->arp_table = p;
 866         return v;
 867 }
 868
 869 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 870                            struct lec_priv *priv)
 871 {
 872         struct hlist_head *lec_misc_tables[] = {
 873                 &priv->lec_arp_empty_ones,
 874                 &priv->lec_no_forward,
 875                 &priv->mcast_fwds
 876         };
 877         void *v = NULL;
 878         int q;
 879
 880         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 881                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 882                 if (v)
 883                         break;
 884         }
 885         state->misc_table = q;
 886         return v;
 887 }
 888
 889 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 890                            struct lec_priv *priv)
 891 {
 892         if (!state->locked) {
 893                 state->locked = priv;
 894                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 895         }
 896         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 897                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 898                 state->locked = NULL;
 899                 /* Partial state reset for the next time we get called */
 900                 state->arp_table = state->misc_table = 0;
 901         }
 902         return state->locked;
 903 }
 904
 905 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 906 {
 907         struct net_device *dev;
 908         void *v;
 909
 910         dev = state->dev ? state->dev : dev_lec[state->itf];
 911         v = (dev && netdev_priv(dev)) ?
 912                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 913         if (!v && dev) {
 914                 dev_put(dev);
 915                 /* Partial state reset for the next time we get called */
 916                 dev = NULL;
 917         }
 918         state->dev = dev;
 919         return v;
 920 }
 921
 922 static void *lec_get_idx(struct lec_state *state, loff_t l)
 923 {
 924         void *v = NULL;
 925
 926         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 927                 v = lec_itf_walk(state, &l);
 928                 if (v)
 929                         break;
 930         }
 931         return v;
 932 }
 933
 934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 935 {
 936         struct lec_state *state = seq->private;
 937
 938         state->itf = 0;
 939         state->dev = NULL;
 940         state->locked = NULL;
 941         state->arp_table = 0;
 942         state->misc_table = 0;
 943         state->node = SEQ_START_TOKEN;
 944
 945         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 946 }
 947
 948 static void lec_seq_stop(struct seq_file *seq, void *v)
 949 {
 950         struct lec_state *state = seq->private;
 951
 952         if (state->dev) {
 953                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 954                                        state->flags);
 955                 dev_put(state->dev);
 956         }
 957 }
 958
 959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 960 {
 961         struct lec_state *state = seq->private;
 962
 963         v = lec_get_idx(state, 1);
 964         *pos += !!PTR_ERR(v);
 965         return v;
 966 }
 967
 968 static int lec_seq_show(struct seq_file *seq, void *v)
 969 {
 970         static const char lec_banner[] =
 971             "Itf  MAC          ATM destination"
 972             "                          Status            Flags "
 973             "VPI/VCI Recv VPI/VCI\n";
 974
 975         if (v == SEQ_START_TOKEN)
 976                 seq_puts(seq, lec_banner);
 977         else {
 978                 struct lec_state *state = seq->private;
 979                 struct net_device *dev = state->dev;
 980                 struct lec_arp_table *entry = hlist_entry(state->node,
 981                                                           struct lec_arp_table,
 982                                                           next);
 983
 984                 seq_printf(seq, "%s ", dev->name);
 985                 lec_info(seq, entry);
 986         }
 987         return 0;
 988 }
 989
 990 static const struct seq_operations lec_seq_ops = {
 991         .start = lec_seq_start,
 992         .next = lec_seq_next,
 993         .stop = lec_seq_stop,
 994         .show = lec_seq_show,
 995 };
 996 #endif
 997
 998 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 999 {
1000         struct atm_vcc *vcc = ATM_SD(sock);
1001         int err = 0;
1002
1003         switch (cmd) {
1004         case ATMLEC_CTRL:
1005         case ATMLEC_MCAST:
1006         case ATMLEC_DATA:
1007                 if (!capable(CAP_NET_ADMIN))
1008                         return -EPERM;
1009                 break;
1010         default:
1011                 return -ENOIOCTLCMD;
1012         }
1013
1014         switch (cmd) {
1015         case ATMLEC_CTRL:
1016                 err = lecd_attach(vcc, (int)arg);
1017                 if (err >= 0)
1018                         sock->state = SS_CONNECTED;
1019                 break;
1020         case ATMLEC_MCAST:
1021                 err = lec_mcast_attach(vcc, (int)arg);
1022                 break;
1023         case ATMLEC_DATA:
1024                 err = lec_vcc_attach(vcc, (void __user *)arg);
1025                 break;
1026         }
1027
1028         return err;
1029 }
1030
1031 static struct atm_ioctl lane_ioctl_ops = {
1032         .owner = THIS_MODULE,
1033         .ioctl = lane_ioctl,
1034 };
1035
1036 static int __init lane_module_init(void)
1037 {
1038 #ifdef CONFIG_PROC_FS
1039         struct proc_dir_entry *p;
1040
1041         p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1042                         sizeof(struct lec_state), NULL);
1043         if (!p) {
1044                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1045                 return -ENOMEM;
1046         }
1047 #endif
1048
1049         register_atm_ioctl(&lane_ioctl_ops);
1050         pr_info("lec.c: initialized\n");
1051         return 0;
1052 }
1053
1054 static void __exit lane_module_cleanup(void)
1055 {
1056         int i;
1057
1058 #ifdef CONFIG_PROC_FS
1059         remove_proc_entry("lec", atm_proc_root);
1060 #endif
1061
1062         deregister_atm_ioctl(&lane_ioctl_ops);
1063
1064         for (i = 0; i < MAX_LEC_ITF; i++) {
1065                 if (dev_lec[i] != NULL) {
1066                         unregister_netdev(dev_lec[i]);
1067                         free_netdev(dev_lec[i]);
1068                         dev_lec[i] = NULL;
1069                 }
1070         }
1071 }
1072
1073 module_init(lane_module_init);
1074 module_exit(lane_module_cleanup);
1075
1076 /*
1077  * LANE2: 3.1.3, LE_RESOLVE.request
1078  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1079  * If sizeoftlvs == NULL the default TLVs associated with with this
1080  * lec will be used.
1081  * If dst_mac == NULL, targetless LE_ARP will be sent
1082  */
1083 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1084                          u8 **tlvs, u32 *sizeoftlvs)
1085 {
1086         unsigned long flags;
1087         struct lec_priv *priv = netdev_priv(dev);
1088         struct lec_arp_table *table;
1089         struct sk_buff *skb;
1090         int retval;
1091
1092         if (force == 0) {
1093                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1094                 table = lec_arp_find(priv, dst_mac);
1095                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1096                 if (table == NULL)
1097                         return -1;
1098
1099                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1100                 if (*tlvs == NULL)
1101                         return -1;
1102
1103                 *sizeoftlvs = table->sizeoftlvs;
1104
1105                 return 0;
1106         }
1107
1108         if (sizeoftlvs == NULL)
1109                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1110
1111         else {
1112                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1113                 if (skb == NULL)
1114                         return -1;
1115                 skb->len = *sizeoftlvs;
1116                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1117                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1118         }
1119         return retval;
1120 }
1121
1122 /*
1123  * LANE2: 3.1.4, LE_ASSOCIATE.request
1124  * Associate the *tlvs with the *lan_dst address.
1125  * Will overwrite any previous association
1126  * Returns 1 for success, 0 for failure (out of memory)
1127  *
1128  */
1129 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1130                                const u8 *tlvs, u32 sizeoftlvs)
1131 {
1132         int retval;
1133         struct sk_buff *skb;
1134         struct lec_priv *priv = netdev_priv(dev);
1135
1136         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1137                 return 0;       /* not our mac address */
1138
1139         kfree(priv->tlvs);      /* NULL if there was no previous association */
1140
1141         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1142         if (priv->tlvs == NULL)
1143                 return 0;
1144         priv->sizeoftlvs = sizeoftlvs;
1145
1146         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1147         if (skb == NULL)
1148                 return 0;
1149         skb->len = sizeoftlvs;
1150         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1151         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1152         if (retval != 0)
1153                 pr_info("lec.c: lane2_associate_req() failed\n");
1154         /*
1155          * If the previous association has changed we must
1156          * somehow notify other LANE entities about the change
1157          */
1158         return 1;
1159 }
1160
1161 /*
1162  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1163  *
1164  */
1165 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1166                                 const u8 *tlvs, u32 sizeoftlvs)
1167 {
1168 #if 0
1169         int i = 0;
1170 #endif
1171         struct lec_priv *priv = netdev_priv(dev);
1172 #if 0                           /*
1173                                  * Why have the TLVs in LE_ARP entries
1174                                  * since we do not use them? When you
1175                                  * uncomment this code, make sure the
1176                                  * TLVs get freed when entry is killed
1177                                  */
1178         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1179
1180         if (entry == NULL)
1181                 return;         /* should not happen */
1182
1183         kfree(entry->tlvs);
1184
1185         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1186         if (entry->tlvs == NULL)
1187                 return;
1188         entry->sizeoftlvs = sizeoftlvs;
1189 #endif
1190 #if 0
1191         pr_info("\n");
1192         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1193         while (i < sizeoftlvs)
1194                 pr_cont("%02x ", tlvs[i++]);
1195
1196         pr_cont("\n");
1197 #endif
1198
1199         /* tell MPOA about the TLVs we saw */
1200         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1201                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1202                                                      tlvs, sizeoftlvs);
1203         }
1204 }
1205
1206 /*
1207  * Here starts what used to lec_arpc.c
1208  *
1209  * lec_arpc.c was added here when making
1210  * lane client modular. October 1997
1211  */
1212
1213 #include <linux/types.h>
1214 #include <linux/timer.h>
1215 #include <linux/param.h>
1216 #include <linux/atomic.h>
1217 #include <linux/inetdevice.h>
1218 #include <net/route.h>
1219
1220 #if 0
1221 #define pr_debug(format, args...)
1222 /*
1223   #define pr_debug printk
1224 */
1225 #endif
1226 #define DEBUG_ARP_TABLE 0
1227
1228 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1229
1230 static void lec_arp_check_expire(struct work_struct *work);
1231 static void lec_arp_expire_arp(struct timer_list *t);
1232
1233 /*
1234  * Arp table funcs
1235  */
1236
1237 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1238
1239 /*
1240  * Initialization of arp-cache
1241  */
1242 static void lec_arp_init(struct lec_priv *priv)
1243 {
1244         unsigned short i;
1245
1246         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1247                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1248         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1249         INIT_HLIST_HEAD(&priv->lec_no_forward);
1250         INIT_HLIST_HEAD(&priv->mcast_fwds);
1251         spin_lock_init(&priv->lec_arp_lock);
1252         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1253         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1254 }
1255
1256 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1257 {
1258         if (entry->vcc) {
1259                 struct atm_vcc *vcc = entry->vcc;
1260                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1261                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1262
1263                 vcc->pop = vpriv->old_pop;
1264                 if (vpriv->xoff)
1265                         netif_wake_queue(dev);
1266                 kfree(vpriv);
1267                 vcc->user_back = NULL;
1268                 vcc->push = entry->old_push;
1269                 vcc_release_async(vcc, -EPIPE);
1270                 entry->vcc = NULL;
1271         }
1272         if (entry->recv_vcc) {
1273                 struct atm_vcc *vcc = entry->recv_vcc;
1274                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1275
1276                 kfree(vpriv);
1277                 vcc->user_back = NULL;
1278
1279                 entry->recv_vcc->push = entry->old_recv_push;
1280                 vcc_release_async(entry->recv_vcc, -EPIPE);
1281                 entry->recv_vcc = NULL;
1282         }
1283 }
1284
1285 /*
1286  * Insert entry to lec_arp_table
1287  * LANE2: Add to the end of the list to satisfy 8.1.13
1288  */
1289 static inline void
1290 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1291 {
1292         struct hlist_head *tmp;
1293
1294         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1295         hlist_add_head(&entry->next, tmp);
1296
1297         pr_debug("Added entry:%pM\n", entry->mac_addr);
1298 }
1299
1300 /*
1301  * Remove entry from lec_arp_table
1302  */
1303 static int
1304 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1305 {
1306         struct lec_arp_table *entry;
1307         int i, remove_vcc = 1;
1308
1309         if (!to_remove)
1310                 return -1;
1311
1312         hlist_del(&to_remove->next);
1313         del_timer(&to_remove->timer);
1314
1315         /*
1316          * If this is the only MAC connected to this VCC,
1317          * also tear down the VCC
1318          */
1319         if (to_remove->status >= ESI_FLUSH_PENDING) {
1320                 /*
1321                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1322                  */
1323                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1324                         hlist_for_each_entry(entry,
1325                                              &priv->lec_arp_tables[i], next) {
1326                                 if (memcmp(to_remove->atm_addr,
1327                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1328                                         remove_vcc = 0;
1329                                         break;
1330                                 }
1331                         }
1332                 }
1333                 if (remove_vcc)
1334                         lec_arp_clear_vccs(to_remove);
1335         }
1336         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1337
1338         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1339         return 0;
1340 }
1341
1342 #if DEBUG_ARP_TABLE
1343 static const char *get_status_string(unsigned char st)
1344 {
1345         switch (st) {
1346         case ESI_UNKNOWN:
1347                 return "ESI_UNKNOWN";
1348         case ESI_ARP_PENDING:
1349                 return "ESI_ARP_PENDING";
1350         case ESI_VC_PENDING:
1351                 return "ESI_VC_PENDING";
1352         case ESI_FLUSH_PENDING:
1353                 return "ESI_FLUSH_PENDING";
1354         case ESI_FORWARD_DIRECT:
1355                 return "ESI_FORWARD_DIRECT";
1356         }
1357         return "<UNKNOWN>";
1358 }
1359
1360 static void dump_arp_table(struct lec_priv *priv)
1361 {
1362         struct lec_arp_table *rulla;
1363         char buf[256];
1364         int i, j, offset;
1365
1366         pr_info("Dump %p:\n", priv);
1367         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1368                 hlist_for_each_entry(rulla,
1369                                      &priv->lec_arp_tables[i], next) {
1370                         offset = 0;
1371                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1372                         offset += sprintf(buf + offset, "Mac: %pM",
1373                                           rulla->mac_addr);
1374                         offset += sprintf(buf + offset, " Atm:");
1375                         for (j = 0; j < ATM_ESA_LEN; j++) {
1376                                 offset += sprintf(buf + offset,
1377                                                   "%2.2x ",
1378                                                   rulla->atm_addr[j] & 0xff);
1379                         }
1380                         offset += sprintf(buf + offset,
1381                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1382                                           rulla->vcc ? rulla->vcc->vpi : 0,
1383                                           rulla->vcc ? rulla->vcc->vci : 0,
1384                                           rulla->recv_vcc ? rulla->recv_vcc->
1385                                           vpi : 0,
1386                                           rulla->recv_vcc ? rulla->recv_vcc->
1387                                           vci : 0, rulla->last_used,
1388                                           rulla->timestamp, rulla->no_tries);
1389                         offset +=
1390                             sprintf(buf + offset,
1391                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1392                                     rulla->flags, rulla->packets_flooded,
1393                                     get_status_string(rulla->status));
1394                         pr_info("%s\n", buf);
1395                 }
1396         }
1397
1398         if (!hlist_empty(&priv->lec_no_forward))
1399                 pr_info("No forward\n");
1400         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1401                 offset = 0;
1402                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1403                 offset += sprintf(buf + offset, " Atm:");
1404                 for (j = 0; j < ATM_ESA_LEN; j++) {
1405                         offset += sprintf(buf + offset, "%2.2x ",
1406                                           rulla->atm_addr[j] & 0xff);
1407                 }
1408                 offset += sprintf(buf + offset,
1409                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1410                                   rulla->vcc ? rulla->vcc->vpi : 0,
1411                                   rulla->vcc ? rulla->vcc->vci : 0,
1412                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1413                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1414                                   rulla->last_used,
1415                                   rulla->timestamp, rulla->no_tries);
1416                 offset += sprintf(buf + offset,
1417                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1418                                   rulla->flags, rulla->packets_flooded,
1419                                   get_status_string(rulla->status));
1420                 pr_info("%s\n", buf);
1421         }
1422
1423         if (!hlist_empty(&priv->lec_arp_empty_ones))
1424                 pr_info("Empty ones\n");
1425         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1426                 offset = 0;
1427                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1428                 offset += sprintf(buf + offset, " Atm:");
1429                 for (j = 0; j < ATM_ESA_LEN; j++) {
1430                         offset += sprintf(buf + offset, "%2.2x ",
1431                                           rulla->atm_addr[j] & 0xff);
1432                 }
1433                 offset += sprintf(buf + offset,
1434                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1435                                   rulla->vcc ? rulla->vcc->vpi : 0,
1436                                   rulla->vcc ? rulla->vcc->vci : 0,
1437                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1438                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1439                                   rulla->last_used,
1440                                   rulla->timestamp, rulla->no_tries);
1441                 offset += sprintf(buf + offset,
1442                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1443                                   rulla->flags, rulla->packets_flooded,
1444                                   get_status_string(rulla->status));
1445                 pr_info("%s", buf);
1446         }
1447
1448         if (!hlist_empty(&priv->mcast_fwds))
1449                 pr_info("Multicast Forward VCCs\n");
1450         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1451                 offset = 0;
1452                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1453                 offset += sprintf(buf + offset, " Atm:");
1454                 for (j = 0; j < ATM_ESA_LEN; j++) {
1455                         offset += sprintf(buf + offset, "%2.2x ",
1456                                           rulla->atm_addr[j] & 0xff);
1457                 }
1458                 offset += sprintf(buf + offset,
1459                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1460                                   rulla->vcc ? rulla->vcc->vpi : 0,
1461                                   rulla->vcc ? rulla->vcc->vci : 0,
1462                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1463                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1464                                   rulla->last_used,
1465                                   rulla->timestamp, rulla->no_tries);
1466                 offset += sprintf(buf + offset,
1467                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1468                                   rulla->flags, rulla->packets_flooded,
1469                                   get_status_string(rulla->status));
1470                 pr_info("%s\n", buf);
1471         }
1472
1473 }
1474 #else
1475 #define dump_arp_table(priv) do { } while (0)
1476 #endif
1477
1478 /*
1479  * Destruction of arp-cache
1480  */
1481 static void lec_arp_destroy(struct lec_priv *priv)
1482 {
1483         unsigned long flags;
1484         struct hlist_node *next;
1485         struct lec_arp_table *entry;
1486         int i;
1487
1488         cancel_delayed_work_sync(&priv->lec_arp_work);
1489
1490         /*
1491          * Remove all entries
1492          */
1493
1494         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1495         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1496                 hlist_for_each_entry_safe(entry, next,
1497                                           &priv->lec_arp_tables[i], next) {
1498                         lec_arp_remove(priv, entry);
1499                         lec_arp_put(entry);
1500                 }
1501                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1502         }
1503
1504         hlist_for_each_entry_safe(entry, next,
1505                                   &priv->lec_arp_empty_ones, next) {
1506                 del_timer_sync(&entry->timer);
1507                 lec_arp_clear_vccs(entry);
1508                 hlist_del(&entry->next);
1509                 lec_arp_put(entry);
1510         }
1511         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1512
1513         hlist_for_each_entry_safe(entry, next,
1514                                   &priv->lec_no_forward, next) {
1515                 del_timer_sync(&entry->timer);
1516                 lec_arp_clear_vccs(entry);
1517                 hlist_del(&entry->next);
1518                 lec_arp_put(entry);
1519         }
1520         INIT_HLIST_HEAD(&priv->lec_no_forward);
1521
1522         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1523                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1524                 lec_arp_clear_vccs(entry);
1525                 hlist_del(&entry->next);
1526                 lec_arp_put(entry);
1527         }
1528         INIT_HLIST_HEAD(&priv->mcast_fwds);
1529         priv->mcast_vcc = NULL;
1530         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1531 }
1532
1533 /*
1534  * Find entry by mac_address
1535  */
1536 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1537                                           const unsigned char *mac_addr)
1538 {
1539         struct hlist_head *head;
1540         struct lec_arp_table *entry;
1541
1542         pr_debug("%pM\n", mac_addr);
1543
1544         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1545         hlist_for_each_entry(entry, head, next) {
1546                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1547                         return entry;
1548         }
1549         return NULL;
1550 }
1551
1552 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1553                                         const unsigned char *mac_addr)
1554 {
1555         struct lec_arp_table *to_return;
1556
1557         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1558         if (!to_return) {
1559                 pr_info("LEC: Arp entry kmalloc failed\n");
1560                 return NULL;
1561         }
1562         ether_addr_copy(to_return->mac_addr, mac_addr);
1563         INIT_HLIST_NODE(&to_return->next);
1564         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1565         to_return->last_used = jiffies;
1566         to_return->priv = priv;
1567         skb_queue_head_init(&to_return->tx_wait);
1568         refcount_set(&to_return->usage, 1);
1569         return to_return;
1570 }
1571
1572 /* Arp sent timer expired */
1573 static void lec_arp_expire_arp(struct timer_list *t)
1574 {
1575         struct lec_arp_table *entry;
1576
1577         entry = from_timer(entry, t, timer);
1578
1579         pr_debug("\n");
1580         if (entry->status == ESI_ARP_PENDING) {
1581                 if (entry->no_tries <= entry->priv->max_retry_count) {
1582                         if (entry->is_rdesc)
1583                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1584                                              entry->mac_addr, NULL, NULL);
1585                         else
1586                                 send_to_lecd(entry->priv, l_arp_xmt,
1587                                              entry->mac_addr, NULL, NULL);
1588                         entry->no_tries++;
1589                 }
1590                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1591         }
1592 }
1593
1594 /* Unknown/unused vcc expire, remove associated entry */
1595 static void lec_arp_expire_vcc(struct timer_list *t)
1596 {
1597         unsigned long flags;
1598         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1599         struct lec_priv *priv = to_remove->priv;
1600
1601         del_timer(&to_remove->timer);
1602
1603         pr_debug("%p %p: vpi:%d vci:%d\n",
1604                  to_remove, priv,
1605                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1606                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1607
1608         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1609         hlist_del(&to_remove->next);
1610         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1611
1612         lec_arp_clear_vccs(to_remove);
1613         lec_arp_put(to_remove);
1614 }
1615
1616 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1617                                    unsigned long now,
1618                                    struct lec_priv *priv)
1619 {
1620         unsigned long time_to_check;
1621
1622         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1623                 time_to_check = priv->forward_delay_time;
1624         else
1625                 time_to_check = priv->aging_time;
1626
1627         pr_debug("About to expire: %lx - %lx > %lx\n",
1628                  now, entry->last_used, time_to_check);
1629         if (time_after(now, entry->last_used + time_to_check) &&
1630             !(entry->flags & LEC_PERMANENT_FLAG) &&
1631             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1632                 /* Remove entry */
1633                 pr_debug("Entry timed out\n");
1634                 lec_arp_remove(priv, entry);
1635                 lec_arp_put(entry);
1636         } else {
1637                 /* Something else */
1638                 if ((entry->status == ESI_VC_PENDING ||
1639                      entry->status == ESI_ARP_PENDING) &&
1640                     time_after_eq(now, entry->timestamp +
1641                                        priv->max_unknown_frame_time)) {
1642                         entry->timestamp = jiffies;
1643                         entry->packets_flooded = 0;
1644                         if (entry->status == ESI_VC_PENDING)
1645                                 send_to_lecd(priv, l_svc_setup,
1646                                              entry->mac_addr,
1647                                              entry->atm_addr,
1648                                              NULL);
1649                 }
1650                 if (entry->status == ESI_FLUSH_PENDING &&
1651                     time_after_eq(now, entry->timestamp +
1652                                        priv->path_switching_delay)) {
1653                         lec_arp_hold(entry);
1654                         return true;
1655                 }
1656         }
1657
1658         return false;
1659 }
1660 /*
1661  * Expire entries.
1662  * 1. Re-set timer
1663  * 2. For each entry, delete entries that have aged past the age limit.
1664  * 3. For each entry, depending on the status of the entry, perform
1665  *    the following maintenance.
1666  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1667  *       tick_count is above the max_unknown_frame_time, clear
1668  *       the tick_count to zero and clear the packets_flooded counter
1669  *       to zero. This supports the packet rate limit per address
1670  *       while flooding unknowns.
1671  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1672  *       than or equal to the path_switching_delay, change the status
1673  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1674  *       regardless of the progress of the flush protocol.
1675  */
1676 static void lec_arp_check_expire(struct work_struct *work)
1677 {
1678         unsigned long flags;
1679         struct lec_priv *priv =
1680                 container_of(work, struct lec_priv, lec_arp_work.work);
1681         struct hlist_node *next;
1682         struct lec_arp_table *entry;
1683         unsigned long now;
1684         int i;
1685
1686         pr_debug("%p\n", priv);
1687         now = jiffies;
1688 restart:
1689         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1690         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1691                 hlist_for_each_entry_safe(entry, next,
1692                                           &priv->lec_arp_tables[i], next) {
1693                         if (__lec_arp_check_expire(entry, now, priv)) {
1694                                 struct sk_buff *skb;
1695                                 struct atm_vcc *vcc = entry->vcc;
1696
1697                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1698                                                        flags);
1699                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1700                                         lec_send(vcc, skb);
1701                                 entry->last_used = jiffies;
1702                                 entry->status = ESI_FORWARD_DIRECT;
1703                                 lec_arp_put(entry);
1704
1705                                 goto restart;
1706                         }
1707                 }
1708         }
1709         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1710
1711         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1712 }
1713
1714 /*
1715  * Try to find vcc where mac_address is attached.
1716  *
1717  */
1718 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1719                                        const unsigned char *mac_to_find,
1720                                        int is_rdesc,
1721                                        struct lec_arp_table **ret_entry)
1722 {
1723         unsigned long flags;
1724         struct lec_arp_table *entry;
1725         struct atm_vcc *found;
1726
1727         if (mac_to_find[0] & 0x01) {
1728                 switch (priv->lane_version) {
1729                 case 1:
1730                         return priv->mcast_vcc;
1731                 case 2: /* LANE2 wants arp for multicast addresses */
1732                         if (ether_addr_equal(mac_to_find, bus_mac))
1733                                 return priv->mcast_vcc;
1734                         break;
1735                 default:
1736                         break;
1737                 }
1738         }
1739
1740         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1741         entry = lec_arp_find(priv, mac_to_find);
1742
1743         if (entry) {
1744                 if (entry->status == ESI_FORWARD_DIRECT) {
1745                         /* Connection Ok */
1746                         entry->last_used = jiffies;
1747                         lec_arp_hold(entry);
1748                         *ret_entry = entry;
1749                         found = entry->vcc;
1750                         goto out;
1751                 }
1752                 /*
1753                  * If the LE_ARP cache entry is still pending, reset count to 0
1754                  * so another LE_ARP request can be made for this frame.
1755                  */
1756                 if (entry->status == ESI_ARP_PENDING)
1757                         entry->no_tries = 0;
1758                 /*
1759                  * Data direct VC not yet set up, check to see if the unknown
1760                  * frame count is greater than the limit. If the limit has
1761                  * not been reached, allow the caller to send packet to
1762                  * BUS.
1763                  */
1764                 if (entry->status != ESI_FLUSH_PENDING &&
1765                     entry->packets_flooded <
1766                     priv->maximum_unknown_frame_count) {
1767                         entry->packets_flooded++;
1768                         pr_debug("Flooding..\n");
1769                         found = priv->mcast_vcc;
1770                         goto out;
1771                 }
1772                 /*
1773                  * We got here because entry->status == ESI_FLUSH_PENDING
1774                  * or BUS flood limit was reached for an entry which is
1775                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1776                  */
1777                 lec_arp_hold(entry);
1778                 *ret_entry = entry;
1779                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1780                          entry->vcc);
1781                 found = NULL;
1782         } else {
1783                 /* No matching entry was found */
1784                 entry = make_entry(priv, mac_to_find);
1785                 pr_debug("Making entry\n");
1786                 if (!entry) {
1787                         found = priv->mcast_vcc;
1788                         goto out;
1789                 }
1790                 lec_arp_add(priv, entry);
1791                 /* We want arp-request(s) to be sent */
1792                 entry->packets_flooded = 1;
1793                 entry->status = ESI_ARP_PENDING;
1794                 entry->no_tries = 1;
1795                 entry->last_used = entry->timestamp = jiffies;
1796                 entry->is_rdesc = is_rdesc;
1797                 if (entry->is_rdesc)
1798                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1799                                      NULL);
1800                 else
1801                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1802                 entry->timer.expires = jiffies + (1 * HZ);
1803                 entry->timer.function = lec_arp_expire_arp;
1804                 add_timer(&entry->timer);
1805                 found = priv->mcast_vcc;
1806         }
1807
1808 out:
1809         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1810         return found;
1811 }
1812
1813 static int
1814 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1815                 unsigned long permanent)
1816 {
1817         unsigned long flags;
1818         struct hlist_node *next;
1819         struct lec_arp_table *entry;
1820         int i;
1821
1822         pr_debug("\n");
1823         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1824         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1825                 hlist_for_each_entry_safe(entry, next,
1826                                           &priv->lec_arp_tables[i], next) {
1827                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1828                             (permanent ||
1829                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1830                                 lec_arp_remove(priv, entry);
1831                                 lec_arp_put(entry);
1832                         }
1833                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1834                         return 0;
1835                 }
1836         }
1837         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1838         return -1;
1839 }
1840
1841 /*
1842  * Notifies:  Response to arp_request (atm_addr != NULL)
1843  */
1844 static void
1845 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1846                const unsigned char *atm_addr, unsigned long remoteflag,
1847                unsigned int targetless_le_arp)
1848 {
1849         unsigned long flags;
1850         struct hlist_node *next;
1851         struct lec_arp_table *entry, *tmp;
1852         int i;
1853
1854         pr_debug("%smac:%pM\n",
1855                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1856
1857         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1858         entry = lec_arp_find(priv, mac_addr);
1859         if (entry == NULL && targetless_le_arp)
1860                 goto out;       /*
1861                                  * LANE2: ignore targetless LE_ARPs for which
1862                                  * we have no entry in the cache. 7.1.30
1863                                  */
1864         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1865                 hlist_for_each_entry_safe(entry, next,
1866                                           &priv->lec_arp_empty_ones, next) {
1867                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1868                                 hlist_del(&entry->next);
1869                                 del_timer(&entry->timer);
1870                                 tmp = lec_arp_find(priv, mac_addr);
1871                                 if (tmp) {
1872                                         del_timer(&tmp->timer);
1873                                         tmp->status = ESI_FORWARD_DIRECT;
1874                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1875                                         tmp->vcc = entry->vcc;
1876                                         tmp->old_push = entry->old_push;
1877                                         tmp->last_used = jiffies;
1878                                         del_timer(&entry->timer);
1879                                         lec_arp_put(entry);
1880                                         entry = tmp;
1881                                 } else {
1882                                         entry->status = ESI_FORWARD_DIRECT;
1883                                         ether_addr_copy(entry->mac_addr,
1884                                                         mac_addr);
1885                                         entry->last_used = jiffies;
1886                                         lec_arp_add(priv, entry);
1887                                 }
1888                                 if (remoteflag)
1889                                         entry->flags |= LEC_REMOTE_FLAG;
1890                                 else
1891                                         entry->flags &= ~LEC_REMOTE_FLAG;
1892                                 pr_debug("After update\n");
1893                                 dump_arp_table(priv);
1894                                 goto out;
1895                         }
1896                 }
1897         }
1898
1899         entry = lec_arp_find(priv, mac_addr);
1900         if (!entry) {
1901                 entry = make_entry(priv, mac_addr);
1902                 if (!entry)
1903                         goto out;
1904                 entry->status = ESI_UNKNOWN;
1905                 lec_arp_add(priv, entry);
1906                 /* Temporary, changes before end of function */
1907         }
1908         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1909         del_timer(&entry->timer);
1910         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1911                 hlist_for_each_entry(tmp,
1912                                      &priv->lec_arp_tables[i], next) {
1913                         if (entry != tmp &&
1914                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1915                                 /* Vcc to this host exists */
1916                                 if (tmp->status > ESI_VC_PENDING) {
1917                                         /*
1918                                          * ESI_FLUSH_PENDING,
1919                                          * ESI_FORWARD_DIRECT
1920                                          */
1921                                         entry->vcc = tmp->vcc;
1922                                         entry->old_push = tmp->old_push;
1923                                 }
1924                                 entry->status = tmp->status;
1925                                 break;
1926                         }
1927                 }
1928         }
1929         if (remoteflag)
1930                 entry->flags |= LEC_REMOTE_FLAG;
1931         else
1932                 entry->flags &= ~LEC_REMOTE_FLAG;
1933         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1934                 entry->status = ESI_VC_PENDING;
1935                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1936         }
1937         pr_debug("After update2\n");
1938         dump_arp_table(priv);
1939 out:
1940         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1941 }
1942
1943 /*
1944  * Notifies: Vcc setup ready
1945  */
1946 static void
1947 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1948               struct atm_vcc *vcc,
1949               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1950 {
1951         unsigned long flags;
1952         struct lec_arp_table *entry;
1953         int i, found_entry = 0;
1954
1955         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1956         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1957         if (ioc_data->receive == 2) {
1958                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1959 #if 0
1960                 entry = lec_arp_find(priv, bus_mac);
1961                 if (!entry) {
1962                         pr_info("LEC_ARP: Multicast entry not found!\n");
1963                         goto out;
1964                 }
1965                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1966                 entry->recv_vcc = vcc;
1967                 entry->old_recv_push = old_push;
1968 #endif
1969                 entry = make_entry(priv, bus_mac);
1970                 if (entry == NULL)
1971                         goto out;
1972                 del_timer(&entry->timer);
1973                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1974                 entry->recv_vcc = vcc;
1975                 entry->old_recv_push = old_push;
1976                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1977                 goto out;
1978         } else if (ioc_data->receive == 1) {
1979                 /*
1980                  * Vcc which we don't want to make default vcc,
1981                  * attach it anyway.
1982                  */
1983                 pr_debug("LEC_ARP:Attaching data direct, not default: %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",
1984                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1985                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1986                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1987                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1988                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1989                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1990                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1991                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1992                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1993                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1994                 entry = make_entry(priv, bus_mac);
1995                 if (entry == NULL)
1996                         goto out;
1997                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1998                 eth_zero_addr(entry->mac_addr);
1999                 entry->recv_vcc = vcc;
2000                 entry->old_recv_push = old_push;
2001                 entry->status = ESI_UNKNOWN;
2002                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2003                 entry->timer.function = lec_arp_expire_vcc;
2004                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2005                 add_timer(&entry->timer);
2006                 dump_arp_table(priv);
2007                 goto out;
2008         }
2009         pr_debug("LEC_ARP:Attaching data direct, default: %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",
2010                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2011                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2012                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2013                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2014                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2015                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2016                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2017                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2018                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2019                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2020         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2021                 hlist_for_each_entry(entry,
2022                                      &priv->lec_arp_tables[i], next) {
2023                         if (memcmp
2024                             (ioc_data->atm_addr, entry->atm_addr,
2025                              ATM_ESA_LEN) == 0) {
2026                                 pr_debug("LEC_ARP: Attaching data direct\n");
2027                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2028                                          entry->vcc ? entry->vcc->vci : 0,
2029                                          entry->recv_vcc ? entry->recv_vcc->
2030                                          vci : 0);
2031                                 found_entry = 1;
2032                                 del_timer(&entry->timer);
2033                                 entry->vcc = vcc;
2034                                 entry->old_push = old_push;
2035                                 if (entry->status == ESI_VC_PENDING) {
2036                                         if (priv->maximum_unknown_frame_count
2037                                             == 0)
2038                                                 entry->status =
2039                                                     ESI_FORWARD_DIRECT;
2040                                         else {
2041                                                 entry->timestamp = jiffies;
2042                                                 entry->status =
2043                                                     ESI_FLUSH_PENDING;
2044 #if 0
2045                                                 send_to_lecd(priv, l_flush_xmt,
2046                                                              NULL,
2047                                                              entry->atm_addr,
2048                                                              NULL);
2049 #endif
2050                                         }
2051                                 } else {
2052                                         /*
2053                                          * They were forming a connection
2054                                          * to us, and we to them. Our
2055                                          * ATM address is numerically lower
2056                                          * than theirs, so we make connection
2057                                          * we formed into default VCC (8.1.11).
2058                                          * Connection they made gets torn
2059                                          * down. This might confuse some
2060                                          * clients. Can be changed if
2061                                          * someone reports trouble...
2062                                          */
2063                                         ;
2064                                 }
2065                         }
2066                 }
2067         }
2068         if (found_entry) {
2069                 pr_debug("After vcc was added\n");
2070                 dump_arp_table(priv);
2071                 goto out;
2072         }
2073         /*
2074          * Not found, snatch address from first data packet that arrives
2075          * from this vcc
2076          */
2077         entry = make_entry(priv, bus_mac);
2078         if (!entry)
2079                 goto out;
2080         entry->vcc = vcc;
2081         entry->old_push = old_push;
2082         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2083         eth_zero_addr(entry->mac_addr);
2084         entry->status = ESI_UNKNOWN;
2085         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2086         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2087         entry->timer.function = lec_arp_expire_vcc;
2088         add_timer(&entry->timer);
2089         pr_debug("After vcc was added\n");
2090         dump_arp_table(priv);
2091 out:
2092         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2093 }
2094
2095 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2096 {
2097         unsigned long flags;
2098         struct lec_arp_table *entry;
2099         int i;
2100
2101         pr_debug("%lx\n", tran_id);
2102 restart:
2103         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2104         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2105                 hlist_for_each_entry(entry,
2106                                      &priv->lec_arp_tables[i], next) {
2107                         if (entry->flush_tran_id == tran_id &&
2108                             entry->status == ESI_FLUSH_PENDING) {
2109                                 struct sk_buff *skb;
2110                                 struct atm_vcc *vcc = entry->vcc;
2111
2112                                 lec_arp_hold(entry);
2113                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2114                                                        flags);
2115                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2116                                         lec_send(vcc, skb);
2117                                 entry->last_used = jiffies;
2118                                 entry->status = ESI_FORWARD_DIRECT;
2119                                 lec_arp_put(entry);
2120                                 pr_debug("LEC_ARP: Flushed\n");
2121                                 goto restart;
2122                         }
2123                 }
2124         }
2125         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2126         dump_arp_table(priv);
2127 }
2128
2129 static void
2130 lec_set_flush_tran_id(struct lec_priv *priv,
2131                       const unsigned char *atm_addr, unsigned long tran_id)
2132 {
2133         unsigned long flags;
2134         struct lec_arp_table *entry;
2135         int i;
2136
2137         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2138         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2139                 hlist_for_each_entry(entry,
2140                                      &priv->lec_arp_tables[i], next) {
2141                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2142                                 entry->flush_tran_id = tran_id;
2143                                 pr_debug("Set flush transaction id to %lx for %p\n",
2144                                          tran_id, entry);
2145                         }
2146                 }
2147         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2148 }
2149
2150 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2151 {
2152         unsigned long flags;
2153         unsigned char mac_addr[] = {
2154                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2155         };
2156         struct lec_arp_table *to_add;
2157         struct lec_vcc_priv *vpriv;
2158         int err = 0;
2159
2160         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2161         if (!vpriv)
2162                 return -ENOMEM;
2163         vpriv->xoff = 0;
2164         vpriv->old_pop = vcc->pop;
2165         vcc->user_back = vpriv;
2166         vcc->pop = lec_pop;
2167         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2168         to_add = make_entry(priv, mac_addr);
2169         if (!to_add) {
2170                 vcc->pop = vpriv->old_pop;
2171                 kfree(vpriv);
2172                 err = -ENOMEM;
2173                 goto out;
2174         }
2175         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2176         to_add->status = ESI_FORWARD_DIRECT;
2177         to_add->flags |= LEC_PERMANENT_FLAG;
2178         to_add->vcc = vcc;
2179         to_add->old_push = vcc->push;
2180         vcc->push = lec_push;
2181         priv->mcast_vcc = vcc;
2182         lec_arp_add(priv, to_add);
2183 out:
2184         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2185         return err;
2186 }
2187
2188 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2189 {
2190         unsigned long flags;
2191         struct hlist_node *next;
2192         struct lec_arp_table *entry;
2193         int i;
2194
2195         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2196         dump_arp_table(priv);
2197
2198         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2199
2200         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2201                 hlist_for_each_entry_safe(entry, next,
2202                                           &priv->lec_arp_tables[i], next) {
2203                         if (vcc == entry->vcc) {
2204                                 lec_arp_remove(priv, entry);
2205                                 lec_arp_put(entry);
2206                                 if (priv->mcast_vcc == vcc)
2207                                         priv->mcast_vcc = NULL;
2208                         }
2209                 }
2210         }
2211
2212         hlist_for_each_entry_safe(entry, next,
2213                                   &priv->lec_arp_empty_ones, next) {
2214                 if (entry->vcc == vcc) {
2215                         lec_arp_clear_vccs(entry);
2216                         del_timer(&entry->timer);
2217                         hlist_del(&entry->next);
2218                         lec_arp_put(entry);
2219                 }
2220         }
2221
2222         hlist_for_each_entry_safe(entry, next,
2223                                   &priv->lec_no_forward, next) {
2224                 if (entry->recv_vcc == vcc) {
2225                         lec_arp_clear_vccs(entry);
2226                         del_timer(&entry->timer);
2227                         hlist_del(&entry->next);
2228                         lec_arp_put(entry);
2229                 }
2230         }
2231
2232         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2233                 if (entry->recv_vcc == vcc) {
2234                         lec_arp_clear_vccs(entry);
2235                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2236                         hlist_del(&entry->next);
2237                         lec_arp_put(entry);
2238                 }
2239         }
2240
2241         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2242         dump_arp_table(priv);
2243 }
2244
2245 static void
2246 lec_arp_check_empties(struct lec_priv *priv,
2247                       struct atm_vcc *vcc, struct sk_buff *skb)
2248 {
2249         unsigned long flags;
2250         struct hlist_node *next;
2251         struct lec_arp_table *entry, *tmp;
2252         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2253         unsigned char *src = hdr->h_source;
2254
2255         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2256         hlist_for_each_entry_safe(entry, next,
2257                                   &priv->lec_arp_empty_ones, next) {
2258                 if (vcc == entry->vcc) {
2259                         del_timer(&entry->timer);
2260                         ether_addr_copy(entry->mac_addr, src);
2261                         entry->status = ESI_FORWARD_DIRECT;
2262                         entry->last_used = jiffies;
2263                         /* We might have got an entry */
2264                         tmp = lec_arp_find(priv, src);
2265                         if (tmp) {
2266                                 lec_arp_remove(priv, tmp);
2267                                 lec_arp_put(tmp);
2268                         }
2269                         hlist_del(&entry->next);
2270                         lec_arp_add(priv, entry);
2271                         goto out;
2272                 }
2273         }
2274         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2275 out:
2276         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2277 }
2278
2279 MODULE_LICENSE("GPL");