net/atm/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 || !dev_lec[arg])
 714                 return -EINVAL;
 715         vcc->proto_data = dev_lec[arg];
 716         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 717 }
 718
 719 /* Initialize device. */
 720 static int lecd_attach(struct atm_vcc *vcc, int arg)
 721 {
 722         int i;
 723         struct lec_priv *priv;
 724
 725         if (arg < 0)
 726                 i = 0;
 727         else
 728                 i = arg;
 729         if (arg >= MAX_LEC_ITF)
 730                 return -EINVAL;
 731         if (!dev_lec[i]) {
 732                 int size;
 733
 734                 size = sizeof(struct lec_priv);
 735                 dev_lec[i] = alloc_etherdev(size);
 736                 if (!dev_lec[i])
 737                         return -ENOMEM;
 738                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 739                 dev_lec[i]->max_mtu = 18190;
 740                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 741                 if (register_netdev(dev_lec[i])) {
 742                         free_netdev(dev_lec[i]);
 743                         return -EINVAL;
 744                 }
 745
 746                 priv = netdev_priv(dev_lec[i]);
 747         } else {
 748                 priv = netdev_priv(dev_lec[i]);
 749                 if (priv->lecd)
 750                         return -EADDRINUSE;
 751         }
 752         lec_arp_init(priv);
 753         priv->itfnum = i;       /* LANE2 addition */
 754         priv->lecd = vcc;
 755         vcc->dev = &lecatm_dev;
 756         vcc_insert_socket(sk_atm(vcc));
 757
 758         vcc->proto_data = dev_lec[i];
 759         set_bit(ATM_VF_META, &vcc->flags);
 760         set_bit(ATM_VF_READY, &vcc->flags);
 761
 762         /* Set default values to these variables */
 763         priv->maximum_unknown_frame_count = 1;
 764         priv->max_unknown_frame_time = (1 * HZ);
 765         priv->vcc_timeout_period = (1200 * HZ);
 766         priv->max_retry_count = 1;
 767         priv->aging_time = (300 * HZ);
 768         priv->forward_delay_time = (15 * HZ);
 769         priv->topology_change = 0;
 770         priv->arp_response_time = (1 * HZ);
 771         priv->flush_timeout = (4 * HZ);
 772         priv->path_switching_delay = (6 * HZ);
 773
 774         if (dev_lec[i]->flags & IFF_UP)
 775                 netif_start_queue(dev_lec[i]);
 776         __module_get(THIS_MODULE);
 777         return i;
 778 }
 779
 780 #ifdef CONFIG_PROC_FS
 781 static const char *lec_arp_get_status_string(unsigned char status)
 782 {
 783         static const char *const lec_arp_status_string[] = {
 784                 "ESI_UNKNOWN       ",
 785                 "ESI_ARP_PENDING   ",
 786                 "ESI_VC_PENDING    ",
 787                 "<Undefined>       ",
 788                 "ESI_FLUSH_PENDING ",
 789                 "ESI_FORWARD_DIRECT"
 790         };
 791
 792         if (status > ESI_FORWARD_DIRECT)
 793                 status = 3;     /* ESI_UNDEFINED */
 794         return lec_arp_status_string[status];
 795 }
 796
 797 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 798 {
 799         int i;
 800
 801         for (i = 0; i < ETH_ALEN; i++)
 802                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 803         seq_printf(seq, " ");
 804         for (i = 0; i < ATM_ESA_LEN; i++)
 805                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 806         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 807                    entry->flags & 0xffff);
 808         if (entry->vcc)
 809                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 810         else
 811                 seq_printf(seq, "        ");
 812         if (entry->recv_vcc) {
 813                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 814                            entry->recv_vcc->vci);
 815         }
 816         seq_putc(seq, '\n');
 817 }
 818
 819 struct lec_state {
 820         unsigned long flags;
 821         struct lec_priv *locked;
 822         struct hlist_node *node;
 823         struct net_device *dev;
 824         int itf;
 825         int arp_table;
 826         int misc_table;
 827 };
 828
 829 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 830                           loff_t *l)
 831 {
 832         struct hlist_node *e = state->node;
 833
 834         if (!e)
 835                 e = tbl->first;
 836         if (e == SEQ_START_TOKEN) {
 837                 e = tbl->first;
 838                 --*l;
 839         }
 840
 841         for (; e; e = e->next) {
 842                 if (--*l < 0)
 843                         break;
 844         }
 845         state->node = e;
 846
 847         return (*l < 0) ? state : NULL;
 848 }
 849
 850 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 851                           struct lec_priv *priv)
 852 {
 853         void *v = NULL;
 854         int p;
 855
 856         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 857                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 858                 if (v)
 859                         break;
 860         }
 861         state->arp_table = p;
 862         return v;
 863 }
 864
 865 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 866                            struct lec_priv *priv)
 867 {
 868         struct hlist_head *lec_misc_tables[] = {
 869                 &priv->lec_arp_empty_ones,
 870                 &priv->lec_no_forward,
 871                 &priv->mcast_fwds
 872         };
 873         void *v = NULL;
 874         int q;
 875
 876         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 877                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 878                 if (v)
 879                         break;
 880         }
 881         state->misc_table = q;
 882         return v;
 883 }
 884
 885 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 886                            struct lec_priv *priv)
 887 {
 888         if (!state->locked) {
 889                 state->locked = priv;
 890                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 891         }
 892         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 893                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 894                 state->locked = NULL;
 895                 /* Partial state reset for the next time we get called */
 896                 state->arp_table = state->misc_table = 0;
 897         }
 898         return state->locked;
 899 }
 900
 901 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 902 {
 903         struct net_device *dev;
 904         void *v;
 905
 906         dev = state->dev ? state->dev : dev_lec[state->itf];
 907         v = (dev && netdev_priv(dev)) ?
 908                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 909         if (!v && dev) {
 910                 dev_put(dev);
 911                 /* Partial state reset for the next time we get called */
 912                 dev = NULL;
 913         }
 914         state->dev = dev;
 915         return v;
 916 }
 917
 918 static void *lec_get_idx(struct lec_state *state, loff_t l)
 919 {
 920         void *v = NULL;
 921
 922         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 923                 v = lec_itf_walk(state, &l);
 924                 if (v)
 925                         break;
 926         }
 927         return v;
 928 }
 929
 930 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 931 {
 932         struct lec_state *state = seq->private;
 933
 934         state->itf = 0;
 935         state->dev = NULL;
 936         state->locked = NULL;
 937         state->arp_table = 0;
 938         state->misc_table = 0;
 939         state->node = SEQ_START_TOKEN;
 940
 941         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 942 }
 943
 944 static void lec_seq_stop(struct seq_file *seq, void *v)
 945 {
 946         struct lec_state *state = seq->private;
 947
 948         if (state->dev) {
 949                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 950                                        state->flags);
 951                 dev_put(state->dev);
 952         }
 953 }
 954
 955 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 956 {
 957         struct lec_state *state = seq->private;
 958
 959         v = lec_get_idx(state, 1);
 960         *pos += !!PTR_ERR(v);
 961         return v;
 962 }
 963
 964 static int lec_seq_show(struct seq_file *seq, void *v)
 965 {
 966         static const char lec_banner[] =
 967             "Itf  MAC          ATM destination"
 968             "                          Status            Flags "
 969             "VPI/VCI Recv VPI/VCI\n";
 970
 971         if (v == SEQ_START_TOKEN)
 972                 seq_puts(seq, lec_banner);
 973         else {
 974                 struct lec_state *state = seq->private;
 975                 struct net_device *dev = state->dev;
 976                 struct lec_arp_table *entry = hlist_entry(state->node,
 977                                                           struct lec_arp_table,
 978                                                           next);
 979
 980                 seq_printf(seq, "%s ", dev->name);
 981                 lec_info(seq, entry);
 982         }
 983         return 0;
 984 }
 985
 986 static const struct seq_operations lec_seq_ops = {
 987         .start = lec_seq_start,
 988         .next = lec_seq_next,
 989         .stop = lec_seq_stop,
 990         .show = lec_seq_show,
 991 };
 992 #endif
 993
 994 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 995 {
 996         struct atm_vcc *vcc = ATM_SD(sock);
 997         int err = 0;
 998
 999         switch (cmd) {
1000         case ATMLEC_CTRL:
1001         case ATMLEC_MCAST:
1002         case ATMLEC_DATA:
1003                 if (!capable(CAP_NET_ADMIN))
1004                         return -EPERM;
1005                 break;
1006         default:
1007                 return -ENOIOCTLCMD;
1008         }
1009
1010         switch (cmd) {
1011         case ATMLEC_CTRL:
1012                 err = lecd_attach(vcc, (int)arg);
1013                 if (err >= 0)
1014                         sock->state = SS_CONNECTED;
1015                 break;
1016         case ATMLEC_MCAST:
1017                 err = lec_mcast_attach(vcc, (int)arg);
1018                 break;
1019         case ATMLEC_DATA:
1020                 err = lec_vcc_attach(vcc, (void __user *)arg);
1021                 break;
1022         }
1023
1024         return err;
1025 }
1026
1027 static struct atm_ioctl lane_ioctl_ops = {
1028         .owner = THIS_MODULE,
1029         .ioctl = lane_ioctl,
1030 };
1031
1032 static int __init lane_module_init(void)
1033 {
1034 #ifdef CONFIG_PROC_FS
1035         struct proc_dir_entry *p;
1036
1037         p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1038                         sizeof(struct lec_state), NULL);
1039         if (!p) {
1040                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1041                 return -ENOMEM;
1042         }
1043 #endif
1044
1045         register_atm_ioctl(&lane_ioctl_ops);
1046         pr_info("lec.c: initialized\n");
1047         return 0;
1048 }
1049
1050 static void __exit lane_module_cleanup(void)
1051 {
1052         int i;
1053
1054 #ifdef CONFIG_PROC_FS
1055         remove_proc_entry("lec", atm_proc_root);
1056 #endif
1057
1058         deregister_atm_ioctl(&lane_ioctl_ops);
1059
1060         for (i = 0; i < MAX_LEC_ITF; i++) {
1061                 if (dev_lec[i] != NULL) {
1062                         unregister_netdev(dev_lec[i]);
1063                         free_netdev(dev_lec[i]);
1064                         dev_lec[i] = NULL;
1065                 }
1066         }
1067 }
1068
1069 module_init(lane_module_init);
1070 module_exit(lane_module_cleanup);
1071
1072 /*
1073  * LANE2: 3.1.3, LE_RESOLVE.request
1074  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1075  * If sizeoftlvs == NULL the default TLVs associated with with this
1076  * lec will be used.
1077  * If dst_mac == NULL, targetless LE_ARP will be sent
1078  */
1079 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1080                          u8 **tlvs, u32 *sizeoftlvs)
1081 {
1082         unsigned long flags;
1083         struct lec_priv *priv = netdev_priv(dev);
1084         struct lec_arp_table *table;
1085         struct sk_buff *skb;
1086         int retval;
1087
1088         if (force == 0) {
1089                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1090                 table = lec_arp_find(priv, dst_mac);
1091                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1092                 if (table == NULL)
1093                         return -1;
1094
1095                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1096                 if (*tlvs == NULL)
1097                         return -1;
1098
1099                 *sizeoftlvs = table->sizeoftlvs;
1100
1101                 return 0;
1102         }
1103
1104         if (sizeoftlvs == NULL)
1105                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1106
1107         else {
1108                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1109                 if (skb == NULL)
1110                         return -1;
1111                 skb->len = *sizeoftlvs;
1112                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1113                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1114         }
1115         return retval;
1116 }
1117
1118 /*
1119  * LANE2: 3.1.4, LE_ASSOCIATE.request
1120  * Associate the *tlvs with the *lan_dst address.
1121  * Will overwrite any previous association
1122  * Returns 1 for success, 0 for failure (out of memory)
1123  *
1124  */
1125 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1126                                const u8 *tlvs, u32 sizeoftlvs)
1127 {
1128         int retval;
1129         struct sk_buff *skb;
1130         struct lec_priv *priv = netdev_priv(dev);
1131
1132         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1133                 return 0;       /* not our mac address */
1134
1135         kfree(priv->tlvs);      /* NULL if there was no previous association */
1136
1137         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1138         if (priv->tlvs == NULL)
1139                 return 0;
1140         priv->sizeoftlvs = sizeoftlvs;
1141
1142         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1143         if (skb == NULL)
1144                 return 0;
1145         skb->len = sizeoftlvs;
1146         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1147         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1148         if (retval != 0)
1149                 pr_info("lec.c: lane2_associate_req() failed\n");
1150         /*
1151          * If the previous association has changed we must
1152          * somehow notify other LANE entities about the change
1153          */
1154         return 1;
1155 }
1156
1157 /*
1158  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1159  *
1160  */
1161 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1162                                 const u8 *tlvs, u32 sizeoftlvs)
1163 {
1164 #if 0
1165         int i = 0;
1166 #endif
1167         struct lec_priv *priv = netdev_priv(dev);
1168 #if 0                           /*
1169                                  * Why have the TLVs in LE_ARP entries
1170                                  * since we do not use them? When you
1171                                  * uncomment this code, make sure the
1172                                  * TLVs get freed when entry is killed
1173                                  */
1174         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1175
1176         if (entry == NULL)
1177                 return;         /* should not happen */
1178
1179         kfree(entry->tlvs);
1180
1181         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1182         if (entry->tlvs == NULL)
1183                 return;
1184         entry->sizeoftlvs = sizeoftlvs;
1185 #endif
1186 #if 0
1187         pr_info("\n");
1188         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1189         while (i < sizeoftlvs)
1190                 pr_cont("%02x ", tlvs[i++]);
1191
1192         pr_cont("\n");
1193 #endif
1194
1195         /* tell MPOA about the TLVs we saw */
1196         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1197                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1198                                                      tlvs, sizeoftlvs);
1199         }
1200 }
1201
1202 /*
1203  * Here starts what used to lec_arpc.c
1204  *
1205  * lec_arpc.c was added here when making
1206  * lane client modular. October 1997
1207  */
1208
1209 #include <linux/types.h>
1210 #include <linux/timer.h>
1211 #include <linux/param.h>
1212 #include <linux/atomic.h>
1213 #include <linux/inetdevice.h>
1214 #include <net/route.h>
1215
1216 #if 0
1217 #define pr_debug(format, args...)
1218 /*
1219   #define pr_debug printk
1220 */
1221 #endif
1222 #define DEBUG_ARP_TABLE 0
1223
1224 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1225
1226 static void lec_arp_check_expire(struct work_struct *work);
1227 static void lec_arp_expire_arp(struct timer_list *t);
1228
1229 /*
1230  * Arp table funcs
1231  */
1232
1233 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1234
1235 /*
1236  * Initialization of arp-cache
1237  */
1238 static void lec_arp_init(struct lec_priv *priv)
1239 {
1240         unsigned short i;
1241
1242         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1243                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1244         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1245         INIT_HLIST_HEAD(&priv->lec_no_forward);
1246         INIT_HLIST_HEAD(&priv->mcast_fwds);
1247         spin_lock_init(&priv->lec_arp_lock);
1248         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1249         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1250 }
1251
1252 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1253 {
1254         if (entry->vcc) {
1255                 struct atm_vcc *vcc = entry->vcc;
1256                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1257                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1258
1259                 vcc->pop = vpriv->old_pop;
1260                 if (vpriv->xoff)
1261                         netif_wake_queue(dev);
1262                 kfree(vpriv);
1263                 vcc->user_back = NULL;
1264                 vcc->push = entry->old_push;
1265                 vcc_release_async(vcc, -EPIPE);
1266                 entry->vcc = NULL;
1267         }
1268         if (entry->recv_vcc) {
1269                 entry->recv_vcc->push = entry->old_recv_push;
1270                 vcc_release_async(entry->recv_vcc, -EPIPE);
1271                 entry->recv_vcc = NULL;
1272         }
1273 }
1274
1275 /*
1276  * Insert entry to lec_arp_table
1277  * LANE2: Add to the end of the list to satisfy 8.1.13
1278  */
1279 static inline void
1280 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1281 {
1282         struct hlist_head *tmp;
1283
1284         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1285         hlist_add_head(&entry->next, tmp);
1286
1287         pr_debug("Added entry:%pM\n", entry->mac_addr);
1288 }
1289
1290 /*
1291  * Remove entry from lec_arp_table
1292  */
1293 static int
1294 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1295 {
1296         struct lec_arp_table *entry;
1297         int i, remove_vcc = 1;
1298
1299         if (!to_remove)
1300                 return -1;
1301
1302         hlist_del(&to_remove->next);
1303         del_timer(&to_remove->timer);
1304
1305         /*
1306          * If this is the only MAC connected to this VCC,
1307          * also tear down the VCC
1308          */
1309         if (to_remove->status >= ESI_FLUSH_PENDING) {
1310                 /*
1311                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1312                  */
1313                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1314                         hlist_for_each_entry(entry,
1315                                              &priv->lec_arp_tables[i], next) {
1316                                 if (memcmp(to_remove->atm_addr,
1317                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1318                                         remove_vcc = 0;
1319                                         break;
1320                                 }
1321                         }
1322                 }
1323                 if (remove_vcc)
1324                         lec_arp_clear_vccs(to_remove);
1325         }
1326         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1327
1328         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1329         return 0;
1330 }
1331
1332 #if DEBUG_ARP_TABLE
1333 static const char *get_status_string(unsigned char st)
1334 {
1335         switch (st) {
1336         case ESI_UNKNOWN:
1337                 return "ESI_UNKNOWN";
1338         case ESI_ARP_PENDING:
1339                 return "ESI_ARP_PENDING";
1340         case ESI_VC_PENDING:
1341                 return "ESI_VC_PENDING";
1342         case ESI_FLUSH_PENDING:
1343                 return "ESI_FLUSH_PENDING";
1344         case ESI_FORWARD_DIRECT:
1345                 return "ESI_FORWARD_DIRECT";
1346         }
1347         return "<UNKNOWN>";
1348 }
1349
1350 static void dump_arp_table(struct lec_priv *priv)
1351 {
1352         struct lec_arp_table *rulla;
1353         char buf[256];
1354         int i, j, offset;
1355
1356         pr_info("Dump %p:\n", priv);
1357         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1358                 hlist_for_each_entry(rulla,
1359                                      &priv->lec_arp_tables[i], next) {
1360                         offset = 0;
1361                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1362                         offset += sprintf(buf + offset, "Mac: %pM",
1363                                           rulla->mac_addr);
1364                         offset += sprintf(buf + offset, " Atm:");
1365                         for (j = 0; j < ATM_ESA_LEN; j++) {
1366                                 offset += sprintf(buf + offset,
1367                                                   "%2.2x ",
1368                                                   rulla->atm_addr[j] & 0xff);
1369                         }
1370                         offset += sprintf(buf + offset,
1371                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1372                                           rulla->vcc ? rulla->vcc->vpi : 0,
1373                                           rulla->vcc ? rulla->vcc->vci : 0,
1374                                           rulla->recv_vcc ? rulla->recv_vcc->
1375                                           vpi : 0,
1376                                           rulla->recv_vcc ? rulla->recv_vcc->
1377                                           vci : 0, rulla->last_used,
1378                                           rulla->timestamp, rulla->no_tries);
1379                         offset +=
1380                             sprintf(buf + offset,
1381                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1382                                     rulla->flags, rulla->packets_flooded,
1383                                     get_status_string(rulla->status));
1384                         pr_info("%s\n", buf);
1385                 }
1386         }
1387
1388         if (!hlist_empty(&priv->lec_no_forward))
1389                 pr_info("No forward\n");
1390         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1391                 offset = 0;
1392                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1393                 offset += sprintf(buf + offset, " Atm:");
1394                 for (j = 0; j < ATM_ESA_LEN; j++) {
1395                         offset += sprintf(buf + offset, "%2.2x ",
1396                                           rulla->atm_addr[j] & 0xff);
1397                 }
1398                 offset += sprintf(buf + offset,
1399                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1400                                   rulla->vcc ? rulla->vcc->vpi : 0,
1401                                   rulla->vcc ? rulla->vcc->vci : 0,
1402                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1403                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1404                                   rulla->last_used,
1405                                   rulla->timestamp, rulla->no_tries);
1406                 offset += sprintf(buf + offset,
1407                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1408                                   rulla->flags, rulla->packets_flooded,
1409                                   get_status_string(rulla->status));
1410                 pr_info("%s\n", buf);
1411         }
1412
1413         if (!hlist_empty(&priv->lec_arp_empty_ones))
1414                 pr_info("Empty ones\n");
1415         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1416                 offset = 0;
1417                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1418                 offset += sprintf(buf + offset, " Atm:");
1419                 for (j = 0; j < ATM_ESA_LEN; j++) {
1420                         offset += sprintf(buf + offset, "%2.2x ",
1421                                           rulla->atm_addr[j] & 0xff);
1422                 }
1423                 offset += sprintf(buf + offset,
1424                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1425                                   rulla->vcc ? rulla->vcc->vpi : 0,
1426                                   rulla->vcc ? rulla->vcc->vci : 0,
1427                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1428                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1429                                   rulla->last_used,
1430                                   rulla->timestamp, rulla->no_tries);
1431                 offset += sprintf(buf + offset,
1432                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1433                                   rulla->flags, rulla->packets_flooded,
1434                                   get_status_string(rulla->status));
1435                 pr_info("%s", buf);
1436         }
1437
1438         if (!hlist_empty(&priv->mcast_fwds))
1439                 pr_info("Multicast Forward VCCs\n");
1440         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1441                 offset = 0;
1442                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1443                 offset += sprintf(buf + offset, " Atm:");
1444                 for (j = 0; j < ATM_ESA_LEN; j++) {
1445                         offset += sprintf(buf + offset, "%2.2x ",
1446                                           rulla->atm_addr[j] & 0xff);
1447                 }
1448                 offset += sprintf(buf + offset,
1449                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1450                                   rulla->vcc ? rulla->vcc->vpi : 0,
1451                                   rulla->vcc ? rulla->vcc->vci : 0,
1452                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1453                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1454                                   rulla->last_used,
1455                                   rulla->timestamp, rulla->no_tries);
1456                 offset += sprintf(buf + offset,
1457                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1458                                   rulla->flags, rulla->packets_flooded,
1459                                   get_status_string(rulla->status));
1460                 pr_info("%s\n", buf);
1461         }
1462
1463 }
1464 #else
1465 #define dump_arp_table(priv) do { } while (0)
1466 #endif
1467
1468 /*
1469  * Destruction of arp-cache
1470  */
1471 static void lec_arp_destroy(struct lec_priv *priv)
1472 {
1473         unsigned long flags;
1474         struct hlist_node *next;
1475         struct lec_arp_table *entry;
1476         int i;
1477
1478         cancel_delayed_work_sync(&priv->lec_arp_work);
1479
1480         /*
1481          * Remove all entries
1482          */
1483
1484         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1485         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1486                 hlist_for_each_entry_safe(entry, next,
1487                                           &priv->lec_arp_tables[i], next) {
1488                         lec_arp_remove(priv, entry);
1489                         lec_arp_put(entry);
1490                 }
1491                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1492         }
1493
1494         hlist_for_each_entry_safe(entry, next,
1495                                   &priv->lec_arp_empty_ones, next) {
1496                 del_timer_sync(&entry->timer);
1497                 lec_arp_clear_vccs(entry);
1498                 hlist_del(&entry->next);
1499                 lec_arp_put(entry);
1500         }
1501         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1502
1503         hlist_for_each_entry_safe(entry, next,
1504                                   &priv->lec_no_forward, next) {
1505                 del_timer_sync(&entry->timer);
1506                 lec_arp_clear_vccs(entry);
1507                 hlist_del(&entry->next);
1508                 lec_arp_put(entry);
1509         }
1510         INIT_HLIST_HEAD(&priv->lec_no_forward);
1511
1512         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1513                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1514                 lec_arp_clear_vccs(entry);
1515                 hlist_del(&entry->next);
1516                 lec_arp_put(entry);
1517         }
1518         INIT_HLIST_HEAD(&priv->mcast_fwds);
1519         priv->mcast_vcc = NULL;
1520         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1521 }
1522
1523 /*
1524  * Find entry by mac_address
1525  */
1526 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1527                                           const unsigned char *mac_addr)
1528 {
1529         struct hlist_head *head;
1530         struct lec_arp_table *entry;
1531
1532         pr_debug("%pM\n", mac_addr);
1533
1534         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1535         hlist_for_each_entry(entry, head, next) {
1536                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1537                         return entry;
1538         }
1539         return NULL;
1540 }
1541
1542 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1543                                         const unsigned char *mac_addr)
1544 {
1545         struct lec_arp_table *to_return;
1546
1547         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1548         if (!to_return) {
1549                 pr_info("LEC: Arp entry kmalloc failed\n");
1550                 return NULL;
1551         }
1552         ether_addr_copy(to_return->mac_addr, mac_addr);
1553         INIT_HLIST_NODE(&to_return->next);
1554         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1555         to_return->last_used = jiffies;
1556         to_return->priv = priv;
1557         skb_queue_head_init(&to_return->tx_wait);
1558         refcount_set(&to_return->usage, 1);
1559         return to_return;
1560 }
1561
1562 /* Arp sent timer expired */
1563 static void lec_arp_expire_arp(struct timer_list *t)
1564 {
1565         struct lec_arp_table *entry;
1566
1567         entry = from_timer(entry, t, timer);
1568
1569         pr_debug("\n");
1570         if (entry->status == ESI_ARP_PENDING) {
1571                 if (entry->no_tries <= entry->priv->max_retry_count) {
1572                         if (entry->is_rdesc)
1573                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1574                                              entry->mac_addr, NULL, NULL);
1575                         else
1576                                 send_to_lecd(entry->priv, l_arp_xmt,
1577                                              entry->mac_addr, NULL, NULL);
1578                         entry->no_tries++;
1579                 }
1580                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1581         }
1582 }
1583
1584 /* Unknown/unused vcc expire, remove associated entry */
1585 static void lec_arp_expire_vcc(struct timer_list *t)
1586 {
1587         unsigned long flags;
1588         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1589         struct lec_priv *priv = to_remove->priv;
1590
1591         del_timer(&to_remove->timer);
1592
1593         pr_debug("%p %p: vpi:%d vci:%d\n",
1594                  to_remove, priv,
1595                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1596                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1597
1598         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1599         hlist_del(&to_remove->next);
1600         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1601
1602         lec_arp_clear_vccs(to_remove);
1603         lec_arp_put(to_remove);
1604 }
1605
1606 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1607                                    unsigned long now,
1608                                    struct lec_priv *priv)
1609 {
1610         unsigned long time_to_check;
1611
1612         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1613                 time_to_check = priv->forward_delay_time;
1614         else
1615                 time_to_check = priv->aging_time;
1616
1617         pr_debug("About to expire: %lx - %lx > %lx\n",
1618                  now, entry->last_used, time_to_check);
1619         if (time_after(now, entry->last_used + time_to_check) &&
1620             !(entry->flags & LEC_PERMANENT_FLAG) &&
1621             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1622                 /* Remove entry */
1623                 pr_debug("Entry timed out\n");
1624                 lec_arp_remove(priv, entry);
1625                 lec_arp_put(entry);
1626         } else {
1627                 /* Something else */
1628                 if ((entry->status == ESI_VC_PENDING ||
1629                      entry->status == ESI_ARP_PENDING) &&
1630                     time_after_eq(now, entry->timestamp +
1631                                        priv->max_unknown_frame_time)) {
1632                         entry->timestamp = jiffies;
1633                         entry->packets_flooded = 0;
1634                         if (entry->status == ESI_VC_PENDING)
1635                                 send_to_lecd(priv, l_svc_setup,
1636                                              entry->mac_addr,
1637                                              entry->atm_addr,
1638                                              NULL);
1639                 }
1640                 if (entry->status == ESI_FLUSH_PENDING &&
1641                     time_after_eq(now, entry->timestamp +
1642                                        priv->path_switching_delay)) {
1643                         lec_arp_hold(entry);
1644                         return true;
1645                 }
1646         }
1647
1648         return false;
1649 }
1650 /*
1651  * Expire entries.
1652  * 1. Re-set timer
1653  * 2. For each entry, delete entries that have aged past the age limit.
1654  * 3. For each entry, depending on the status of the entry, perform
1655  *    the following maintenance.
1656  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1657  *       tick_count is above the max_unknown_frame_time, clear
1658  *       the tick_count to zero and clear the packets_flooded counter
1659  *       to zero. This supports the packet rate limit per address
1660  *       while flooding unknowns.
1661  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1662  *       than or equal to the path_switching_delay, change the status
1663  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1664  *       regardless of the progress of the flush protocol.
1665  */
1666 static void lec_arp_check_expire(struct work_struct *work)
1667 {
1668         unsigned long flags;
1669         struct lec_priv *priv =
1670                 container_of(work, struct lec_priv, lec_arp_work.work);
1671         struct hlist_node *next;
1672         struct lec_arp_table *entry;
1673         unsigned long now;
1674         int i;
1675
1676         pr_debug("%p\n", priv);
1677         now = jiffies;
1678 restart:
1679         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1680         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1681                 hlist_for_each_entry_safe(entry, next,
1682                                           &priv->lec_arp_tables[i], next) {
1683                         if (__lec_arp_check_expire(entry, now, priv)) {
1684                                 struct sk_buff *skb;
1685                                 struct atm_vcc *vcc = entry->vcc;
1686
1687                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1688                                                        flags);
1689                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1690                                         lec_send(vcc, skb);
1691                                 entry->last_used = jiffies;
1692                                 entry->status = ESI_FORWARD_DIRECT;
1693                                 lec_arp_put(entry);
1694
1695                                 goto restart;
1696                         }
1697                 }
1698         }
1699         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1700
1701         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1702 }
1703
1704 /*
1705  * Try to find vcc where mac_address is attached.
1706  *
1707  */
1708 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1709                                        const unsigned char *mac_to_find,
1710                                        int is_rdesc,
1711                                        struct lec_arp_table **ret_entry)
1712 {
1713         unsigned long flags;
1714         struct lec_arp_table *entry;
1715         struct atm_vcc *found;
1716
1717         if (mac_to_find[0] & 0x01) {
1718                 switch (priv->lane_version) {
1719                 case 1:
1720                         return priv->mcast_vcc;
1721                 case 2: /* LANE2 wants arp for multicast addresses */
1722                         if (ether_addr_equal(mac_to_find, bus_mac))
1723                                 return priv->mcast_vcc;
1724                         break;
1725                 default:
1726                         break;
1727                 }
1728         }
1729
1730         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1731         entry = lec_arp_find(priv, mac_to_find);
1732
1733         if (entry) {
1734                 if (entry->status == ESI_FORWARD_DIRECT) {
1735                         /* Connection Ok */
1736                         entry->last_used = jiffies;
1737                         lec_arp_hold(entry);
1738                         *ret_entry = entry;
1739                         found = entry->vcc;
1740                         goto out;
1741                 }
1742                 /*
1743                  * If the LE_ARP cache entry is still pending, reset count to 0
1744                  * so another LE_ARP request can be made for this frame.
1745                  */
1746                 if (entry->status == ESI_ARP_PENDING)
1747                         entry->no_tries = 0;
1748                 /*
1749                  * Data direct VC not yet set up, check to see if the unknown
1750                  * frame count is greater than the limit. If the limit has
1751                  * not been reached, allow the caller to send packet to
1752                  * BUS.
1753                  */
1754                 if (entry->status != ESI_FLUSH_PENDING &&
1755                     entry->packets_flooded <
1756                     priv->maximum_unknown_frame_count) {
1757                         entry->packets_flooded++;
1758                         pr_debug("Flooding..\n");
1759                         found = priv->mcast_vcc;
1760                         goto out;
1761                 }
1762                 /*
1763                  * We got here because entry->status == ESI_FLUSH_PENDING
1764                  * or BUS flood limit was reached for an entry which is
1765                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1766                  */
1767                 lec_arp_hold(entry);
1768                 *ret_entry = entry;
1769                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1770                          entry->vcc);
1771                 found = NULL;
1772         } else {
1773                 /* No matching entry was found */
1774                 entry = make_entry(priv, mac_to_find);
1775                 pr_debug("Making entry\n");
1776                 if (!entry) {
1777                         found = priv->mcast_vcc;
1778                         goto out;
1779                 }
1780                 lec_arp_add(priv, entry);
1781                 /* We want arp-request(s) to be sent */
1782                 entry->packets_flooded = 1;
1783                 entry->status = ESI_ARP_PENDING;
1784                 entry->no_tries = 1;
1785                 entry->last_used = entry->timestamp = jiffies;
1786                 entry->is_rdesc = is_rdesc;
1787                 if (entry->is_rdesc)
1788                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1789                                      NULL);
1790                 else
1791                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1792                 entry->timer.expires = jiffies + (1 * HZ);
1793                 entry->timer.function = lec_arp_expire_arp;
1794                 add_timer(&entry->timer);
1795                 found = priv->mcast_vcc;
1796         }
1797
1798 out:
1799         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1800         return found;
1801 }
1802
1803 static int
1804 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1805                 unsigned long permanent)
1806 {
1807         unsigned long flags;
1808         struct hlist_node *next;
1809         struct lec_arp_table *entry;
1810         int i;
1811
1812         pr_debug("\n");
1813         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1814         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1815                 hlist_for_each_entry_safe(entry, next,
1816                                           &priv->lec_arp_tables[i], next) {
1817                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1818                             (permanent ||
1819                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1820                                 lec_arp_remove(priv, entry);
1821                                 lec_arp_put(entry);
1822                         }
1823                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1824                         return 0;
1825                 }
1826         }
1827         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1828         return -1;
1829 }
1830
1831 /*
1832  * Notifies:  Response to arp_request (atm_addr != NULL)
1833  */
1834 static void
1835 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1836                const unsigned char *atm_addr, unsigned long remoteflag,
1837                unsigned int targetless_le_arp)
1838 {
1839         unsigned long flags;
1840         struct hlist_node *next;
1841         struct lec_arp_table *entry, *tmp;
1842         int i;
1843
1844         pr_debug("%smac:%pM\n",
1845                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1846
1847         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1848         entry = lec_arp_find(priv, mac_addr);
1849         if (entry == NULL && targetless_le_arp)
1850                 goto out;       /*
1851                                  * LANE2: ignore targetless LE_ARPs for which
1852                                  * we have no entry in the cache. 7.1.30
1853                                  */
1854         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1855                 hlist_for_each_entry_safe(entry, next,
1856                                           &priv->lec_arp_empty_ones, next) {
1857                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1858                                 hlist_del(&entry->next);
1859                                 del_timer(&entry->timer);
1860                                 tmp = lec_arp_find(priv, mac_addr);
1861                                 if (tmp) {
1862                                         del_timer(&tmp->timer);
1863                                         tmp->status = ESI_FORWARD_DIRECT;
1864                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1865                                         tmp->vcc = entry->vcc;
1866                                         tmp->old_push = entry->old_push;
1867                                         tmp->last_used = jiffies;
1868                                         del_timer(&entry->timer);
1869                                         lec_arp_put(entry);
1870                                         entry = tmp;
1871                                 } else {
1872                                         entry->status = ESI_FORWARD_DIRECT;
1873                                         ether_addr_copy(entry->mac_addr,
1874                                                         mac_addr);
1875                                         entry->last_used = jiffies;
1876                                         lec_arp_add(priv, entry);
1877                                 }
1878                                 if (remoteflag)
1879                                         entry->flags |= LEC_REMOTE_FLAG;
1880                                 else
1881                                         entry->flags &= ~LEC_REMOTE_FLAG;
1882                                 pr_debug("After update\n");
1883                                 dump_arp_table(priv);
1884                                 goto out;
1885                         }
1886                 }
1887         }
1888
1889         entry = lec_arp_find(priv, mac_addr);
1890         if (!entry) {
1891                 entry = make_entry(priv, mac_addr);
1892                 if (!entry)
1893                         goto out;
1894                 entry->status = ESI_UNKNOWN;
1895                 lec_arp_add(priv, entry);
1896                 /* Temporary, changes before end of function */
1897         }
1898         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1899         del_timer(&entry->timer);
1900         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1901                 hlist_for_each_entry(tmp,
1902                                      &priv->lec_arp_tables[i], next) {
1903                         if (entry != tmp &&
1904                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1905                                 /* Vcc to this host exists */
1906                                 if (tmp->status > ESI_VC_PENDING) {
1907                                         /*
1908                                          * ESI_FLUSH_PENDING,
1909                                          * ESI_FORWARD_DIRECT
1910                                          */
1911                                         entry->vcc = tmp->vcc;
1912                                         entry->old_push = tmp->old_push;
1913                                 }
1914                                 entry->status = tmp->status;
1915                                 break;
1916                         }
1917                 }
1918         }
1919         if (remoteflag)
1920                 entry->flags |= LEC_REMOTE_FLAG;
1921         else
1922                 entry->flags &= ~LEC_REMOTE_FLAG;
1923         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1924                 entry->status = ESI_VC_PENDING;
1925                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1926         }
1927         pr_debug("After update2\n");
1928         dump_arp_table(priv);
1929 out:
1930         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1931 }
1932
1933 /*
1934  * Notifies: Vcc setup ready
1935  */
1936 static void
1937 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1938               struct atm_vcc *vcc,
1939               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1940 {
1941         unsigned long flags;
1942         struct lec_arp_table *entry;
1943         int i, found_entry = 0;
1944
1945         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1946         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1947         if (ioc_data->receive == 2) {
1948                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1949 #if 0
1950                 entry = lec_arp_find(priv, bus_mac);
1951                 if (!entry) {
1952                         pr_info("LEC_ARP: Multicast entry not found!\n");
1953                         goto out;
1954                 }
1955                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1956                 entry->recv_vcc = vcc;
1957                 entry->old_recv_push = old_push;
1958 #endif
1959                 entry = make_entry(priv, bus_mac);
1960                 if (entry == NULL)
1961                         goto out;
1962                 del_timer(&entry->timer);
1963                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1964                 entry->recv_vcc = vcc;
1965                 entry->old_recv_push = old_push;
1966                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1967                 goto out;
1968         } else if (ioc_data->receive == 1) {
1969                 /*
1970                  * Vcc which we don't want to make default vcc,
1971                  * attach it anyway.
1972                  */
1973                 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",
1974                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1975                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1976                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1977                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1978                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1979                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1980                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1981                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1982                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1983                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1984                 entry = make_entry(priv, bus_mac);
1985                 if (entry == NULL)
1986                         goto out;
1987                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1988                 eth_zero_addr(entry->mac_addr);
1989                 entry->recv_vcc = vcc;
1990                 entry->old_recv_push = old_push;
1991                 entry->status = ESI_UNKNOWN;
1992                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1993                 entry->timer.function = lec_arp_expire_vcc;
1994                 hlist_add_head(&entry->next, &priv->lec_no_forward);
1995                 add_timer(&entry->timer);
1996                 dump_arp_table(priv);
1997                 goto out;
1998         }
1999         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",
2000                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2001                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2002                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2003                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2004                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2005                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2006                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2007                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2008                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2009                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2010         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2011                 hlist_for_each_entry(entry,
2012                                      &priv->lec_arp_tables[i], next) {
2013                         if (memcmp
2014                             (ioc_data->atm_addr, entry->atm_addr,
2015                              ATM_ESA_LEN) == 0) {
2016                                 pr_debug("LEC_ARP: Attaching data direct\n");
2017                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2018                                          entry->vcc ? entry->vcc->vci : 0,
2019                                          entry->recv_vcc ? entry->recv_vcc->
2020                                          vci : 0);
2021                                 found_entry = 1;
2022                                 del_timer(&entry->timer);
2023                                 entry->vcc = vcc;
2024                                 entry->old_push = old_push;
2025                                 if (entry->status == ESI_VC_PENDING) {
2026                                         if (priv->maximum_unknown_frame_count
2027                                             == 0)
2028                                                 entry->status =
2029                                                     ESI_FORWARD_DIRECT;
2030                                         else {
2031                                                 entry->timestamp = jiffies;
2032                                                 entry->status =
2033                                                     ESI_FLUSH_PENDING;
2034 #if 0
2035                                                 send_to_lecd(priv, l_flush_xmt,
2036                                                              NULL,
2037                                                              entry->atm_addr,
2038                                                              NULL);
2039 #endif
2040                                         }
2041                                 } else {
2042                                         /*
2043                                          * They were forming a connection
2044                                          * to us, and we to them. Our
2045                                          * ATM address is numerically lower
2046                                          * than theirs, so we make connection
2047                                          * we formed into default VCC (8.1.11).
2048                                          * Connection they made gets torn
2049                                          * down. This might confuse some
2050                                          * clients. Can be changed if
2051                                          * someone reports trouble...
2052                                          */
2053                                         ;
2054                                 }
2055                         }
2056                 }
2057         }
2058         if (found_entry) {
2059                 pr_debug("After vcc was added\n");
2060                 dump_arp_table(priv);
2061                 goto out;
2062         }
2063         /*
2064          * Not found, snatch address from first data packet that arrives
2065          * from this vcc
2066          */
2067         entry = make_entry(priv, bus_mac);
2068         if (!entry)
2069                 goto out;
2070         entry->vcc = vcc;
2071         entry->old_push = old_push;
2072         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2073         eth_zero_addr(entry->mac_addr);
2074         entry->status = ESI_UNKNOWN;
2075         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2076         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2077         entry->timer.function = lec_arp_expire_vcc;
2078         add_timer(&entry->timer);
2079         pr_debug("After vcc was added\n");
2080         dump_arp_table(priv);
2081 out:
2082         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2083 }
2084
2085 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2086 {
2087         unsigned long flags;
2088         struct lec_arp_table *entry;
2089         int i;
2090
2091         pr_debug("%lx\n", tran_id);
2092 restart:
2093         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2094         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2095                 hlist_for_each_entry(entry,
2096                                      &priv->lec_arp_tables[i], next) {
2097                         if (entry->flush_tran_id == tran_id &&
2098                             entry->status == ESI_FLUSH_PENDING) {
2099                                 struct sk_buff *skb;
2100                                 struct atm_vcc *vcc = entry->vcc;
2101
2102                                 lec_arp_hold(entry);
2103                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2104                                                        flags);
2105                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2106                                         lec_send(vcc, skb);
2107                                 entry->last_used = jiffies;
2108                                 entry->status = ESI_FORWARD_DIRECT;
2109                                 lec_arp_put(entry);
2110                                 pr_debug("LEC_ARP: Flushed\n");
2111                                 goto restart;
2112                         }
2113                 }
2114         }
2115         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2116         dump_arp_table(priv);
2117 }
2118
2119 static void
2120 lec_set_flush_tran_id(struct lec_priv *priv,
2121                       const unsigned char *atm_addr, unsigned long tran_id)
2122 {
2123         unsigned long flags;
2124         struct lec_arp_table *entry;
2125         int i;
2126
2127         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2128         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2129                 hlist_for_each_entry(entry,
2130                                      &priv->lec_arp_tables[i], next) {
2131                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2132                                 entry->flush_tran_id = tran_id;
2133                                 pr_debug("Set flush transaction id to %lx for %p\n",
2134                                          tran_id, entry);
2135                         }
2136                 }
2137         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2138 }
2139
2140 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2141 {
2142         unsigned long flags;
2143         unsigned char mac_addr[] = {
2144                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2145         };
2146         struct lec_arp_table *to_add;
2147         struct lec_vcc_priv *vpriv;
2148         int err = 0;
2149
2150         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2151         if (!vpriv)
2152                 return -ENOMEM;
2153         vpriv->xoff = 0;
2154         vpriv->old_pop = vcc->pop;
2155         vcc->user_back = vpriv;
2156         vcc->pop = lec_pop;
2157         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2158         to_add = make_entry(priv, mac_addr);
2159         if (!to_add) {
2160                 vcc->pop = vpriv->old_pop;
2161                 kfree(vpriv);
2162                 err = -ENOMEM;
2163                 goto out;
2164         }
2165         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2166         to_add->status = ESI_FORWARD_DIRECT;
2167         to_add->flags |= LEC_PERMANENT_FLAG;
2168         to_add->vcc = vcc;
2169         to_add->old_push = vcc->push;
2170         vcc->push = lec_push;
2171         priv->mcast_vcc = vcc;
2172         lec_arp_add(priv, to_add);
2173 out:
2174         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2175         return err;
2176 }
2177
2178 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2179 {
2180         unsigned long flags;
2181         struct hlist_node *next;
2182         struct lec_arp_table *entry;
2183         int i;
2184
2185         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2186         dump_arp_table(priv);
2187
2188         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2189
2190         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2191                 hlist_for_each_entry_safe(entry, next,
2192                                           &priv->lec_arp_tables[i], next) {
2193                         if (vcc == entry->vcc) {
2194                                 lec_arp_remove(priv, entry);
2195                                 lec_arp_put(entry);
2196                                 if (priv->mcast_vcc == vcc)
2197                                         priv->mcast_vcc = NULL;
2198                         }
2199                 }
2200         }
2201
2202         hlist_for_each_entry_safe(entry, next,
2203                                   &priv->lec_arp_empty_ones, next) {
2204                 if (entry->vcc == vcc) {
2205                         lec_arp_clear_vccs(entry);
2206                         del_timer(&entry->timer);
2207                         hlist_del(&entry->next);
2208                         lec_arp_put(entry);
2209                 }
2210         }
2211
2212         hlist_for_each_entry_safe(entry, next,
2213                                   &priv->lec_no_forward, next) {
2214                 if (entry->recv_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, &priv->mcast_fwds, next) {
2223                 if (entry->recv_vcc == vcc) {
2224                         lec_arp_clear_vccs(entry);
2225                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2226                         hlist_del(&entry->next);
2227                         lec_arp_put(entry);
2228                 }
2229         }
2230
2231         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2232         dump_arp_table(priv);
2233 }
2234
2235 static void
2236 lec_arp_check_empties(struct lec_priv *priv,
2237                       struct atm_vcc *vcc, struct sk_buff *skb)
2238 {
2239         unsigned long flags;
2240         struct hlist_node *next;
2241         struct lec_arp_table *entry, *tmp;
2242         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2243         unsigned char *src = hdr->h_source;
2244
2245         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2246         hlist_for_each_entry_safe(entry, next,
2247                                   &priv->lec_arp_empty_ones, next) {
2248                 if (vcc == entry->vcc) {
2249                         del_timer(&entry->timer);
2250                         ether_addr_copy(entry->mac_addr, src);
2251                         entry->status = ESI_FORWARD_DIRECT;
2252                         entry->last_used = jiffies;
2253                         /* We might have got an entry */
2254                         tmp = lec_arp_find(priv, src);
2255                         if (tmp) {
2256                                 lec_arp_remove(priv, tmp);
2257                                 lec_arp_put(tmp);
2258                         }
2259                         hlist_del(&entry->next);
2260                         lec_arp_add(priv, entry);
2261                         goto out;
2262                 }
2263         }
2264         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2265 out:
2266         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2267 }
2268
2269 MODULE_LICENSE("GPL");