net/atm/lec.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * lec.c: Lan Emulation driver
   4  *
   5  * Marko Kiiskila <mkiiskila@yahoo.com>
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   9
  10 #include <linux/slab.h>
  11 #include <linux/kernel.h>
  12 #include <linux/bitops.h>
  13 #include <linux/capability.h>
  14
  15 /* We are ethernet device */
  16 #include <linux/if_ether.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <net/sock.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/ip.h>
  22 #include <asm/byteorder.h>
  23 #include <linux/uaccess.h>
  24 #include <net/arp.h>
  25 #include <net/dst.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/seq_file.h>
  29
  30 /* And atm device */
  31 #include <linux/atmdev.h>
  32 #include <linux/atmlec.h>
  33
  34 /* Proxy LEC knows about bridging */
  35 #if IS_ENABLED(CONFIG_BRIDGE)
  36 #include "../bridge/br_private.h"
  37
  38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  39 #endif
  40
  41 /* Modular too */
  42 #include <linux/module.h>
  43 #include <linux/init.h>
  44
  45 /* Hardening for Spectre-v1 */
  46 #include <linux/nospec.h>
  47
  48 #include "lec.h"
  49 #include "lec_arpc.h"
  50 #include "resources.h"
  51
  52 #define DUMP_PACKETS 0          /*
  53                                  * 0 = None,
  54                                  * 1 = 30 first bytes
  55                                  * 2 = Whole packet
  56                                  */
  57
  58 #define LEC_UNRES_QUE_LEN 8     /*
  59                                  * number of tx packets to queue for a
  60                                  * single destination while waiting for SVC
  61                                  */
  62
  63 static int lec_open(struct net_device *dev);
  64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  65                                   struct net_device *dev);
  66 static int lec_close(struct net_device *dev);
  67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  68                                           const unsigned char *mac_addr);
  69 static int lec_arp_remove(struct lec_priv *priv,
  70                           struct lec_arp_table *to_remove);
  71 /* LANE2 functions */
  72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  73                                 const u8 *tlvs, u32 sizeoftlvs);
  74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  75                          u8 **tlvs, u32 *sizeoftlvs);
  76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  77                                const u8 *tlvs, u32 sizeoftlvs);
  78
  79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  80                            unsigned long permanent);
  81 static void lec_arp_check_empties(struct lec_priv *priv,
  82                                   struct atm_vcc *vcc, struct sk_buff *skb);
  83 static void lec_arp_destroy(struct lec_priv *priv);
  84 static void lec_arp_init(struct lec_priv *priv);
  85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  86                                        const unsigned char *mac_to_find,
  87                                        int is_rdesc,
  88                                        struct lec_arp_table **ret_entry);
  89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  90                            const unsigned char *atm_addr,
  91                            unsigned long remoteflag,
  92                            unsigned int targetless_le_arp);
  93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  95 static void lec_set_flush_tran_id(struct lec_priv *priv,
  96                                   const unsigned char *atm_addr,
  97                                   unsigned long tran_id);
  98 static void lec_vcc_added(struct lec_priv *priv,
  99                           const struct atmlec_ioc *ioc_data,
 100                           struct atm_vcc *vcc,
 101                           void (*old_push)(struct atm_vcc *vcc,
 102                                            struct sk_buff *skb));
 103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 104
 105 /* must be done under lec_arp_lock */
 106 static inline void lec_arp_hold(struct lec_arp_table *entry)
 107 {
 108         refcount_inc(&entry->usage);
 109 }
 110
 111 static inline void lec_arp_put(struct lec_arp_table *entry)
 112 {
 113         if (refcount_dec_and_test(&entry->usage))
 114                 kfree(entry);
 115 }
 116
 117 static struct lane2_ops lane2_ops = {
 118         .resolve = lane2_resolve,               /* spec 3.1.3 */
 119         .associate_req = lane2_associate_req,   /* spec 3.1.4 */
 120         .associate_indicator = NULL             /* spec 3.1.5 */
 121 };
 122
 123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 124
 125 /* Device structures */
 126 static struct net_device *dev_lec[MAX_LEC_ITF];
 127
 128 #if IS_ENABLED(CONFIG_BRIDGE)
 129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 130 {
 131         char *buff;
 132         struct lec_priv *priv;
 133
 134         /*
 135          * Check if this is a BPDU. If so, ask zeppelin to send
 136          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 137          * as the Config BPDU has
 138          */
 139         buff = skb->data + skb->dev->hard_header_len;
 140         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 141                 struct sock *sk;
 142                 struct sk_buff *skb2;
 143                 struct atmlec_msg *mesg;
 144
 145                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 146                 if (skb2 == NULL)
 147                         return;
 148                 skb2->len = sizeof(struct atmlec_msg);
 149                 mesg = (struct atmlec_msg *)skb2->data;
 150                 mesg->type = l_topology_change;
 151                 buff += 4;
 152                 mesg->content.normal.flag = *buff & 0x01;
 153                                         /* 0x01 is topology change */
 154
 155                 priv = netdev_priv(dev);
 156                 atm_force_charge(priv->lecd, skb2->truesize);
 157                 sk = sk_atm(priv->lecd);
 158                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 159                 sk->sk_data_ready(sk);
 160         }
 161 }
 162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 163
 164 /*
 165  * Open/initialize the netdevice. This is called (in the current kernel)
 166  * sometime after booting when the 'ifconfig' program is run.
 167  *
 168  * This routine should set everything up anew at each open, even
 169  * registers that "should" only need to be set once at boot, so that
 170  * there is non-reboot way to recover if something goes wrong.
 171  */
 172
 173 static int lec_open(struct net_device *dev)
 174 {
 175         netif_start_queue(dev);
 176
 177         return 0;
 178 }
 179
 180 static void
 181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 182 {
 183         struct net_device *dev = skb->dev;
 184
 185         ATM_SKB(skb)->vcc = vcc;
 186         atm_account_tx(vcc, skb);
 187
 188         if (vcc->send(vcc, skb) < 0) {
 189                 dev->stats.tx_dropped++;
 190                 return;
 191         }
 192
 193         dev->stats.tx_packets++;
 194         dev->stats.tx_bytes += skb->len;
 195 }
 196
 197 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
 198 {
 199         pr_info("%s\n", dev->name);
 200         netif_trans_update(dev);
 201         netif_wake_queue(dev);
 202 }
 203
 204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 205                                   struct net_device *dev)
 206 {
 207         struct sk_buff *skb2;
 208         struct lec_priv *priv = netdev_priv(dev);
 209         struct lecdatahdr_8023 *lec_h;
 210         struct atm_vcc *vcc;
 211         struct lec_arp_table *entry;
 212         unsigned char *dst;
 213         int min_frame_size;
 214         int is_rdesc;
 215
 216         pr_debug("called\n");
 217         if (!priv->lecd) {
 218                 pr_info("%s:No lecd attached\n", dev->name);
 219                 dev->stats.tx_errors++;
 220                 netif_stop_queue(dev);
 221                 kfree_skb(skb);
 222                 return NETDEV_TX_OK;
 223         }
 224
 225         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 226                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 227                  (long)skb_end_pointer(skb));
 228 #if IS_ENABLED(CONFIG_BRIDGE)
 229         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 230                 lec_handle_bridge(skb, dev);
 231 #endif
 232
 233         /* Make sure we have room for lec_id */
 234         if (skb_headroom(skb) < 2) {
 235                 pr_debug("reallocating skb\n");
 236                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 237                 if (unlikely(!skb2)) {
 238                         kfree_skb(skb);
 239                         return NETDEV_TX_OK;
 240                 }
 241                 consume_skb(skb);
 242                 skb = skb2;
 243         }
 244         skb_push(skb, 2);
 245
 246         /* Put le header to place */
 247         lec_h = (struct lecdatahdr_8023 *)skb->data;
 248         lec_h->le_header = htons(priv->lecid);
 249
 250 #if DUMP_PACKETS >= 2
 251 #define MAX_DUMP_SKB 99
 252 #elif DUMP_PACKETS >= 1
 253 #define MAX_DUMP_SKB 30
 254 #endif
 255 #if DUMP_PACKETS >= 1
 256         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 257                dev->name, skb->len, priv->lecid);
 258         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 259                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 260 #endif /* DUMP_PACKETS >= 1 */
 261
 262         /* Minimum ethernet-frame size */
 263         min_frame_size = LEC_MINIMUM_8023_SIZE;
 264         if (skb->len < min_frame_size) {
 265                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 266                         skb2 = skb_copy_expand(skb, 0,
 267                                                min_frame_size - skb->truesize,
 268                                                GFP_ATOMIC);
 269                         dev_kfree_skb(skb);
 270                         if (skb2 == NULL) {
 271                                 dev->stats.tx_dropped++;
 272                                 return NETDEV_TX_OK;
 273                         }
 274                         skb = skb2;
 275                 }
 276                 skb_put(skb, min_frame_size - skb->len);
 277         }
 278
 279         /* Send to right vcc */
 280         is_rdesc = 0;
 281         dst = lec_h->h_dest;
 282         entry = NULL;
 283         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 284         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 285                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 286         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 287                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 288                         pr_debug("%s:queuing packet, MAC address %pM\n",
 289                                  dev->name, lec_h->h_dest);
 290                         skb_queue_tail(&entry->tx_wait, skb);
 291                 } else {
 292                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 293                                  dev->name, lec_h->h_dest);
 294                         dev->stats.tx_dropped++;
 295                         dev_kfree_skb(skb);
 296                 }
 297                 goto out;
 298         }
 299 #if DUMP_PACKETS > 0
 300         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 301                dev->name, vcc->vpi, vcc->vci);
 302 #endif /* DUMP_PACKETS > 0 */
 303
 304         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 305                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 306                 lec_send(vcc, skb2);
 307         }
 308
 309         lec_send(vcc, skb);
 310
 311         if (!atm_may_send(vcc, 0)) {
 312                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 313
 314                 vpriv->xoff = 1;
 315                 netif_stop_queue(dev);
 316
 317                 /*
 318                  * vcc->pop() might have occurred in between, making
 319                  * the vcc usuable again.  Since xmit is serialized,
 320                  * this is the only situation we have to re-test.
 321                  */
 322
 323                 if (atm_may_send(vcc, 0))
 324                         netif_wake_queue(dev);
 325         }
 326
 327 out:
 328         if (entry)
 329                 lec_arp_put(entry);
 330         netif_trans_update(dev);
 331         return NETDEV_TX_OK;
 332 }
 333
 334 /* The inverse routine to net_open(). */
 335 static int lec_close(struct net_device *dev)
 336 {
 337         netif_stop_queue(dev);
 338         return 0;
 339 }
 340
 341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 342 {
 343         unsigned long flags;
 344         struct net_device *dev = (struct net_device *)vcc->proto_data;
 345         struct lec_priv *priv = netdev_priv(dev);
 346         struct atmlec_msg *mesg;
 347         struct lec_arp_table *entry;
 348         int i;
 349         char *tmp;              /* FIXME */
 350
 351         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 352         mesg = (struct atmlec_msg *)skb->data;
 353         tmp = skb->data;
 354         tmp += sizeof(struct atmlec_msg);
 355         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 356         switch (mesg->type) {
 357         case l_set_mac_addr:
 358                 for (i = 0; i < 6; i++)
 359                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 360                 break;
 361         case l_del_mac_addr:
 362                 for (i = 0; i < 6; i++)
 363                         dev->dev_addr[i] = 0;
 364                 break;
 365         case l_addr_delete:
 366                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 367                                 mesg->content.normal.flag);
 368                 break;
 369         case l_topology_change:
 370                 priv->topology_change = mesg->content.normal.flag;
 371                 break;
 372         case l_flush_complete:
 373                 lec_flush_complete(priv, mesg->content.normal.flag);
 374                 break;
 375         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 376                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 377                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 378                 lec_arp_remove(priv, entry);
 379                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 380
 381                 if (mesg->content.normal.no_source_le_narp)
 382                         break;
 383                 fallthrough;
 384         case l_arp_update:
 385                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 386                                mesg->content.normal.atm_addr,
 387                                mesg->content.normal.flag,
 388                                mesg->content.normal.targetless_le_arp);
 389                 pr_debug("in l_arp_update\n");
 390                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 391                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 392                                  mesg->sizeoftlvs);
 393                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 394                                             tmp, mesg->sizeoftlvs);
 395                 }
 396                 break;
 397         case l_config:
 398                 priv->maximum_unknown_frame_count =
 399                     mesg->content.config.maximum_unknown_frame_count;
 400                 priv->max_unknown_frame_time =
 401                     (mesg->content.config.max_unknown_frame_time * HZ);
 402                 priv->max_retry_count = mesg->content.config.max_retry_count;
 403                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 404                 priv->forward_delay_time =
 405                     (mesg->content.config.forward_delay_time * HZ);
 406                 priv->arp_response_time =
 407                     (mesg->content.config.arp_response_time * HZ);
 408                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 409                 priv->path_switching_delay =
 410                     (mesg->content.config.path_switching_delay * HZ);
 411                 priv->lane_version = mesg->content.config.lane_version;
 412                                         /* LANE2 */
 413                 priv->lane2_ops = NULL;
 414                 if (priv->lane_version > 1)
 415                         priv->lane2_ops = &lane2_ops;
 416                 rtnl_lock();
 417                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 418                         pr_info("%s: change_mtu to %d failed\n",
 419                                 dev->name, mesg->content.config.mtu);
 420                 rtnl_unlock();
 421                 priv->is_proxy = mesg->content.config.is_proxy;
 422                 break;
 423         case l_flush_tran_id:
 424                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 425                                       mesg->content.normal.flag);
 426                 break;
 427         case l_set_lecid:
 428                 priv->lecid =
 429                     (unsigned short)(0xffff & mesg->content.normal.flag);
 430                 break;
 431         case l_should_bridge:
 432 #if IS_ENABLED(CONFIG_BRIDGE)
 433         {
 434                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 435                          dev->name, mesg->content.proxy.mac_addr);
 436
 437                 if (br_fdb_test_addr_hook == NULL)
 438                         break;
 439
 440                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 441                         /* hit from bridge table, send LE_ARP_RESPONSE */
 442                         struct sk_buff *skb2;
 443                         struct sock *sk;
 444
 445                         pr_debug("%s: entry found, responding to zeppelin\n",
 446                                  dev->name);
 447                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 448                         if (skb2 == NULL)
 449                                 break;
 450                         skb2->len = sizeof(struct atmlec_msg);
 451                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 452                         atm_force_charge(priv->lecd, skb2->truesize);
 453                         sk = sk_atm(priv->lecd);
 454                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 455                         sk->sk_data_ready(sk);
 456                 }
 457         }
 458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 459                 break;
 460         default:
 461                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 462                 dev_kfree_skb(skb);
 463                 return -EINVAL;
 464         }
 465         dev_kfree_skb(skb);
 466         return 0;
 467 }
 468
 469 static void lec_atm_close(struct atm_vcc *vcc)
 470 {
 471         struct sk_buff *skb;
 472         struct net_device *dev = (struct net_device *)vcc->proto_data;
 473         struct lec_priv *priv = netdev_priv(dev);
 474
 475         priv->lecd = NULL;
 476         /* Do something needful? */
 477
 478         netif_stop_queue(dev);
 479         lec_arp_destroy(priv);
 480
 481         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 482                 pr_info("%s closing with messages pending\n", dev->name);
 483         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 484                 atm_return(vcc, skb->truesize);
 485                 dev_kfree_skb(skb);
 486         }
 487
 488         pr_info("%s: Shut down!\n", dev->name);
 489         module_put(THIS_MODULE);
 490 }
 491
 492 static const struct atmdev_ops lecdev_ops = {
 493         .close = lec_atm_close,
 494         .send = lec_atm_send
 495 };
 496
 497 static struct atm_dev lecatm_dev = {
 498         .ops = &lecdev_ops,
 499         .type = "lec",
 500         .number = 999,          /* dummy device number */
 501         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 502 };
 503
 504 /*
 505  * LANE2: new argument struct sk_buff *data contains
 506  * the LE_ARP based TLVs introduced in the LANE2 spec
 507  */
 508 static int
 509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 510              const unsigned char *mac_addr, const unsigned char *atm_addr,
 511              struct sk_buff *data)
 512 {
 513         struct sock *sk;
 514         struct sk_buff *skb;
 515         struct atmlec_msg *mesg;
 516
 517         if (!priv || !priv->lecd)
 518                 return -1;
 519         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 520         if (!skb)
 521                 return -1;
 522         skb->len = sizeof(struct atmlec_msg);
 523         mesg = (struct atmlec_msg *)skb->data;
 524         memset(mesg, 0, sizeof(struct atmlec_msg));
 525         mesg->type = type;
 526         if (data != NULL)
 527                 mesg->sizeoftlvs = data->len;
 528         if (mac_addr)
 529                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 530         else
 531                 mesg->content.normal.targetless_le_arp = 1;
 532         if (atm_addr)
 533                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 534
 535         atm_force_charge(priv->lecd, skb->truesize);
 536         sk = sk_atm(priv->lecd);
 537         skb_queue_tail(&sk->sk_receive_queue, skb);
 538         sk->sk_data_ready(sk);
 539
 540         if (data != NULL) {
 541                 pr_debug("about to send %d bytes of data\n", data->len);
 542                 atm_force_charge(priv->lecd, data->truesize);
 543                 skb_queue_tail(&sk->sk_receive_queue, data);
 544                 sk->sk_data_ready(sk);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static void lec_set_multicast_list(struct net_device *dev)
 551 {
 552         /*
 553          * by default, all multicast frames arrive over the bus.
 554          * eventually support selective multicast service
 555          */
 556 }
 557
 558 static const struct net_device_ops lec_netdev_ops = {
 559         .ndo_open               = lec_open,
 560         .ndo_stop               = lec_close,
 561         .ndo_start_xmit         = lec_start_xmit,
 562         .ndo_tx_timeout         = lec_tx_timeout,
 563         .ndo_set_rx_mode        = lec_set_multicast_list,
 564 };
 565
 566 static const unsigned char lec_ctrl_magic[] = {
 567         0xff,
 568         0x00,
 569         0x01,
 570         0x01
 571 };
 572
 573 #define LEC_DATA_DIRECT_8023  2
 574 #define LEC_DATA_DIRECT_8025  3
 575
 576 static int lec_is_data_direct(struct atm_vcc *vcc)
 577 {
 578         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 579                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 580 }
 581
 582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 583 {
 584         unsigned long flags;
 585         struct net_device *dev = (struct net_device *)vcc->proto_data;
 586         struct lec_priv *priv = netdev_priv(dev);
 587
 588 #if DUMP_PACKETS > 0
 589         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 590                dev->name, vcc->vpi, vcc->vci);
 591 #endif
 592         if (!skb) {
 593                 pr_debug("%s: null skb\n", dev->name);
 594                 lec_vcc_close(priv, vcc);
 595                 return;
 596         }
 597 #if DUMP_PACKETS >= 2
 598 #define MAX_SKB_DUMP 99
 599 #elif DUMP_PACKETS >= 1
 600 #define MAX_SKB_DUMP 30
 601 #endif
 602 #if DUMP_PACKETS > 0
 603         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 604                dev->name, skb->len, priv->lecid);
 605         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 606                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 607 #endif /* DUMP_PACKETS > 0 */
 608         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 609                                 /* Control frame, to daemon */
 610                 struct sock *sk = sk_atm(vcc);
 611
 612                 pr_debug("%s: To daemon\n", dev->name);
 613                 skb_queue_tail(&sk->sk_receive_queue, skb);
 614                 sk->sk_data_ready(sk);
 615         } else {                /* Data frame, queue to protocol handlers */
 616                 struct lec_arp_table *entry;
 617                 unsigned char *src, *dst;
 618
 619                 atm_return(vcc, skb->truesize);
 620                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 621                     !priv->lecd || !(dev->flags & IFF_UP)) {
 622                         /*
 623                          * Probably looping back, or if lecd is missing,
 624                          * lecd has gone down
 625                          */
 626                         pr_debug("Ignoring frame...\n");
 627                         dev_kfree_skb(skb);
 628                         return;
 629                 }
 630                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 631
 632                 /*
 633                  * If this is a Data Direct VCC, and the VCC does not match
 634                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 635                  */
 636                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 637                 if (lec_is_data_direct(vcc)) {
 638                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 639                         entry = lec_arp_find(priv, src);
 640                         if (entry && entry->vcc != vcc) {
 641                                 lec_arp_remove(priv, entry);
 642                                 lec_arp_put(entry);
 643                         }
 644                 }
 645                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 646
 647                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 648                     !priv->is_proxy &&  /* Proxy wants all the packets */
 649                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 650                         dev_kfree_skb(skb);
 651                         return;
 652                 }
 653                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 654                         lec_arp_check_empties(priv, vcc, skb);
 655                 skb_pull(skb, 2);       /* skip lec_id */
 656                 skb->protocol = eth_type_trans(skb, dev);
 657                 dev->stats.rx_packets++;
 658                 dev->stats.rx_bytes += skb->len;
 659                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 660                 netif_rx(skb);
 661         }
 662 }
 663
 664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 665 {
 666         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 667         struct net_device *dev = skb->dev;
 668
 669         if (vpriv == NULL) {
 670                 pr_info("vpriv = NULL!?!?!?\n");
 671                 return;
 672         }
 673
 674         vpriv->old_pop(vcc, skb);
 675
 676         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 677                 vpriv->xoff = 0;
 678                 if (netif_running(dev) && netif_queue_stopped(dev))
 679                         netif_wake_queue(dev);
 680         }
 681 }
 682
 683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 684 {
 685         struct lec_vcc_priv *vpriv;
 686         int bytes_left;
 687         struct atmlec_ioc ioc_data;
 688
 689         /* Lecd must be up in this case */
 690         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 691         if (bytes_left != 0)
 692                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 693         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 694                 return -EINVAL;
 695         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 696         if (!dev_lec[ioc_data.dev_num])
 697                 return -EINVAL;
 698         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 699         if (!vpriv)
 700                 return -ENOMEM;
 701         vpriv->xoff = 0;
 702         vpriv->old_pop = vcc->pop;
 703         vcc->user_back = vpriv;
 704         vcc->pop = lec_pop;
 705         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 706                       &ioc_data, vcc, vcc->push);
 707         vcc->proto_data = dev_lec[ioc_data.dev_num];
 708         vcc->push = lec_push;
 709         return 0;
 710 }
 711
 712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 713 {
 714         if (arg < 0 || arg >= MAX_LEC_ITF)
 715                 return -EINVAL;
 716         arg = array_index_nospec(arg, MAX_LEC_ITF);
 717         if (!dev_lec[arg])
 718                 return -EINVAL;
 719         vcc->proto_data = dev_lec[arg];
 720         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 721 }
 722
 723 /* Initialize device. */
 724 static int lecd_attach(struct atm_vcc *vcc, int arg)
 725 {
 726         int i;
 727         struct lec_priv *priv;
 728
 729         if (arg < 0)
 730                 arg = 0;
 731         if (arg >= MAX_LEC_ITF)
 732                 return -EINVAL;
 733         i = array_index_nospec(arg, MAX_LEC_ITF);
 734         if (!dev_lec[i]) {
 735                 int size;
 736
 737                 size = sizeof(struct lec_priv);
 738                 dev_lec[i] = alloc_etherdev(size);
 739                 if (!dev_lec[i])
 740                         return -ENOMEM;
 741                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 742                 dev_lec[i]->max_mtu = 18190;
 743                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 744                 if (register_netdev(dev_lec[i])) {
 745                         free_netdev(dev_lec[i]);
 746                         return -EINVAL;
 747                 }
 748
 749                 priv = netdev_priv(dev_lec[i]);
 750         } else {
 751                 priv = netdev_priv(dev_lec[i]);
 752                 if (priv->lecd)
 753                         return -EADDRINUSE;
 754         }
 755         lec_arp_init(priv);
 756         priv->itfnum = i;       /* LANE2 addition */
 757         priv->lecd = vcc;
 758         vcc->dev = &lecatm_dev;
 759         vcc_insert_socket(sk_atm(vcc));
 760
 761         vcc->proto_data = dev_lec[i];
 762         set_bit(ATM_VF_META, &vcc->flags);
 763         set_bit(ATM_VF_READY, &vcc->flags);
 764
 765         /* Set default values to these variables */
 766         priv->maximum_unknown_frame_count = 1;
 767         priv->max_unknown_frame_time = (1 * HZ);
 768         priv->vcc_timeout_period = (1200 * HZ);
 769         priv->max_retry_count = 1;
 770         priv->aging_time = (300 * HZ);
 771         priv->forward_delay_time = (15 * HZ);
 772         priv->topology_change = 0;
 773         priv->arp_response_time = (1 * HZ);
 774         priv->flush_timeout = (4 * HZ);
 775         priv->path_switching_delay = (6 * HZ);
 776
 777         if (dev_lec[i]->flags & IFF_UP)
 778                 netif_start_queue(dev_lec[i]);
 779         __module_get(THIS_MODULE);
 780         return i;
 781 }
 782
 783 #ifdef CONFIG_PROC_FS
 784 static const char *lec_arp_get_status_string(unsigned char status)
 785 {
 786         static const char *const lec_arp_status_string[] = {
 787                 "ESI_UNKNOWN       ",
 788                 "ESI_ARP_PENDING   ",
 789                 "ESI_VC_PENDING    ",
 790                 "<Undefined>       ",
 791                 "ESI_FLUSH_PENDING ",
 792                 "ESI_FORWARD_DIRECT"
 793         };
 794
 795         if (status > ESI_FORWARD_DIRECT)
 796                 status = 3;     /* ESI_UNDEFINED */
 797         return lec_arp_status_string[status];
 798 }
 799
 800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 801 {
 802         seq_printf(seq, "%pM ", entry->mac_addr);
 803         seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
 804         seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
 805                    entry->flags & 0xffff);
 806         if (entry->vcc)
 807                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 808         else
 809                 seq_printf(seq, "        ");
 810         if (entry->recv_vcc) {
 811                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 812                            entry->recv_vcc->vci);
 813         }
 814         seq_putc(seq, '\n');
 815 }
 816
 817 struct lec_state {
 818         unsigned long flags;
 819         struct lec_priv *locked;
 820         struct hlist_node *node;
 821         struct net_device *dev;
 822         int itf;
 823         int arp_table;
 824         int misc_table;
 825 };
 826
 827 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 828                           loff_t *l)
 829 {
 830         struct hlist_node *e = state->node;
 831
 832         if (!e)
 833                 e = tbl->first;
 834         if (e == SEQ_START_TOKEN) {
 835                 e = tbl->first;
 836                 --*l;
 837         }
 838
 839         for (; e; e = e->next) {
 840                 if (--*l < 0)
 841                         break;
 842         }
 843         state->node = e;
 844
 845         return (*l < 0) ? state : NULL;
 846 }
 847
 848 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 849                           struct lec_priv *priv)
 850 {
 851         void *v = NULL;
 852         int p;
 853
 854         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 855                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 856                 if (v)
 857                         break;
 858         }
 859         state->arp_table = p;
 860         return v;
 861 }
 862
 863 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 864                            struct lec_priv *priv)
 865 {
 866         struct hlist_head *lec_misc_tables[] = {
 867                 &priv->lec_arp_empty_ones,
 868                 &priv->lec_no_forward,
 869                 &priv->mcast_fwds
 870         };
 871         void *v = NULL;
 872         int q;
 873
 874         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 875                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 876                 if (v)
 877                         break;
 878         }
 879         state->misc_table = q;
 880         return v;
 881 }
 882
 883 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 884                            struct lec_priv *priv)
 885 {
 886         if (!state->locked) {
 887                 state->locked = priv;
 888                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 889         }
 890         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 891                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 892                 state->locked = NULL;
 893                 /* Partial state reset for the next time we get called */
 894                 state->arp_table = state->misc_table = 0;
 895         }
 896         return state->locked;
 897 }
 898
 899 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 900 {
 901         struct net_device *dev;
 902         void *v;
 903
 904         dev = state->dev ? state->dev : dev_lec[state->itf];
 905         v = (dev && netdev_priv(dev)) ?
 906                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 907         if (!v && dev) {
 908                 dev_put(dev);
 909                 /* Partial state reset for the next time we get called */
 910                 dev = NULL;
 911         }
 912         state->dev = dev;
 913         return v;
 914 }
 915
 916 static void *lec_get_idx(struct lec_state *state, loff_t l)
 917 {
 918         void *v = NULL;
 919
 920         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 921                 v = lec_itf_walk(state, &l);
 922                 if (v)
 923                         break;
 924         }
 925         return v;
 926 }
 927
 928 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 929 {
 930         struct lec_state *state = seq->private;
 931
 932         state->itf = 0;
 933         state->dev = NULL;
 934         state->locked = NULL;
 935         state->arp_table = 0;
 936         state->misc_table = 0;
 937         state->node = SEQ_START_TOKEN;
 938
 939         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 940 }
 941
 942 static void lec_seq_stop(struct seq_file *seq, void *v)
 943 {
 944         struct lec_state *state = seq->private;
 945
 946         if (state->dev) {
 947                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 948                                        state->flags);
 949                 dev_put(state->dev);
 950         }
 951 }
 952
 953 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 954 {
 955         struct lec_state *state = seq->private;
 956
 957         ++*pos;
 958         return lec_get_idx(state, 1);
 959 }
 960
 961 static int lec_seq_show(struct seq_file *seq, void *v)
 962 {
 963         static const char lec_banner[] =
 964             "Itf  MAC          ATM destination"
 965             "                          Status            Flags "
 966             "VPI/VCI Recv VPI/VCI\n";
 967
 968         if (v == SEQ_START_TOKEN)
 969                 seq_puts(seq, lec_banner);
 970         else {
 971                 struct lec_state *state = seq->private;
 972                 struct net_device *dev = state->dev;
 973                 struct lec_arp_table *entry = hlist_entry(state->node,
 974                                                           struct lec_arp_table,
 975                                                           next);
 976
 977                 seq_printf(seq, "%s ", dev->name);
 978                 lec_info(seq, entry);
 979         }
 980         return 0;
 981 }
 982
 983 static const struct seq_operations lec_seq_ops = {
 984         .start = lec_seq_start,
 985         .next = lec_seq_next,
 986         .stop = lec_seq_stop,
 987         .show = lec_seq_show,
 988 };
 989 #endif
 990
 991 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 992 {
 993         struct atm_vcc *vcc = ATM_SD(sock);
 994         int err = 0;
 995
 996         switch (cmd) {
 997         case ATMLEC_CTRL:
 998         case ATMLEC_MCAST:
 999         case ATMLEC_DATA:
1000                 if (!capable(CAP_NET_ADMIN))
1001                         return -EPERM;
1002                 break;
1003         default:
1004                 return -ENOIOCTLCMD;
1005         }
1006
1007         switch (cmd) {
1008         case ATMLEC_CTRL:
1009                 err = lecd_attach(vcc, (int)arg);
1010                 if (err >= 0)
1011                         sock->state = SS_CONNECTED;
1012                 break;
1013         case ATMLEC_MCAST:
1014                 err = lec_mcast_attach(vcc, (int)arg);
1015                 break;
1016         case ATMLEC_DATA:
1017                 err = lec_vcc_attach(vcc, (void __user *)arg);
1018                 break;
1019         }
1020
1021         return err;
1022 }
1023
1024 static struct atm_ioctl lane_ioctl_ops = {
1025         .owner = THIS_MODULE,
1026         .ioctl = lane_ioctl,
1027 };
1028
1029 static int __init lane_module_init(void)
1030 {
1031 #ifdef CONFIG_PROC_FS
1032         struct proc_dir_entry *p;
1033
1034         p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1035                         sizeof(struct lec_state), NULL);
1036         if (!p) {
1037                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1038                 return -ENOMEM;
1039         }
1040 #endif
1041
1042         register_atm_ioctl(&lane_ioctl_ops);
1043         pr_info("lec.c: initialized\n");
1044         return 0;
1045 }
1046
1047 static void __exit lane_module_cleanup(void)
1048 {
1049         int i;
1050
1051 #ifdef CONFIG_PROC_FS
1052         remove_proc_entry("lec", atm_proc_root);
1053 #endif
1054
1055         deregister_atm_ioctl(&lane_ioctl_ops);
1056
1057         for (i = 0; i < MAX_LEC_ITF; i++) {
1058                 if (dev_lec[i] != NULL) {
1059                         unregister_netdev(dev_lec[i]);
1060                         free_netdev(dev_lec[i]);
1061                         dev_lec[i] = NULL;
1062                 }
1063         }
1064 }
1065
1066 module_init(lane_module_init);
1067 module_exit(lane_module_cleanup);
1068
1069 /*
1070  * LANE2: 3.1.3, LE_RESOLVE.request
1071  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1072  * If sizeoftlvs == NULL the default TLVs associated with this
1073  * lec will be used.
1074  * If dst_mac == NULL, targetless LE_ARP will be sent
1075  */
1076 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1077                          u8 **tlvs, u32 *sizeoftlvs)
1078 {
1079         unsigned long flags;
1080         struct lec_priv *priv = netdev_priv(dev);
1081         struct lec_arp_table *table;
1082         struct sk_buff *skb;
1083         int retval;
1084
1085         if (force == 0) {
1086                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1087                 table = lec_arp_find(priv, dst_mac);
1088                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1089                 if (table == NULL)
1090                         return -1;
1091
1092                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1093                 if (*tlvs == NULL)
1094                         return -1;
1095
1096                 *sizeoftlvs = table->sizeoftlvs;
1097
1098                 return 0;
1099         }
1100
1101         if (sizeoftlvs == NULL)
1102                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1103
1104         else {
1105                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1106                 if (skb == NULL)
1107                         return -1;
1108                 skb->len = *sizeoftlvs;
1109                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1110                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1111         }
1112         return retval;
1113 }
1114
1115 /*
1116  * LANE2: 3.1.4, LE_ASSOCIATE.request
1117  * Associate the *tlvs with the *lan_dst address.
1118  * Will overwrite any previous association
1119  * Returns 1 for success, 0 for failure (out of memory)
1120  *
1121  */
1122 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1123                                const u8 *tlvs, u32 sizeoftlvs)
1124 {
1125         int retval;
1126         struct sk_buff *skb;
1127         struct lec_priv *priv = netdev_priv(dev);
1128
1129         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1130                 return 0;       /* not our mac address */
1131
1132         kfree(priv->tlvs);      /* NULL if there was no previous association */
1133
1134         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1135         if (priv->tlvs == NULL)
1136                 return 0;
1137         priv->sizeoftlvs = sizeoftlvs;
1138
1139         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1140         if (skb == NULL)
1141                 return 0;
1142         skb->len = sizeoftlvs;
1143         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1144         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1145         if (retval != 0)
1146                 pr_info("lec.c: lane2_associate_req() failed\n");
1147         /*
1148          * If the previous association has changed we must
1149          * somehow notify other LANE entities about the change
1150          */
1151         return 1;
1152 }
1153
1154 /*
1155  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1156  *
1157  */
1158 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1159                                 const u8 *tlvs, u32 sizeoftlvs)
1160 {
1161 #if 0
1162         int i = 0;
1163 #endif
1164         struct lec_priv *priv = netdev_priv(dev);
1165 #if 0                           /*
1166                                  * Why have the TLVs in LE_ARP entries
1167                                  * since we do not use them? When you
1168                                  * uncomment this code, make sure the
1169                                  * TLVs get freed when entry is killed
1170                                  */
1171         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1172
1173         if (entry == NULL)
1174                 return;         /* should not happen */
1175
1176         kfree(entry->tlvs);
1177
1178         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1179         if (entry->tlvs == NULL)
1180                 return;
1181         entry->sizeoftlvs = sizeoftlvs;
1182 #endif
1183 #if 0
1184         pr_info("\n");
1185         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1186         while (i < sizeoftlvs)
1187                 pr_cont("%02x ", tlvs[i++]);
1188
1189         pr_cont("\n");
1190 #endif
1191
1192         /* tell MPOA about the TLVs we saw */
1193         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1194                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1195                                                      tlvs, sizeoftlvs);
1196         }
1197 }
1198
1199 /*
1200  * Here starts what used to lec_arpc.c
1201  *
1202  * lec_arpc.c was added here when making
1203  * lane client modular. October 1997
1204  */
1205
1206 #include <linux/types.h>
1207 #include <linux/timer.h>
1208 #include <linux/param.h>
1209 #include <linux/atomic.h>
1210 #include <linux/inetdevice.h>
1211 #include <net/route.h>
1212
1213 #if 0
1214 #define pr_debug(format, args...)
1215 /*
1216   #define pr_debug printk
1217 */
1218 #endif
1219 #define DEBUG_ARP_TABLE 0
1220
1221 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1222
1223 static void lec_arp_check_expire(struct work_struct *work);
1224 static void lec_arp_expire_arp(struct timer_list *t);
1225
1226 /*
1227  * Arp table funcs
1228  */
1229
1230 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1231
1232 /*
1233  * Initialization of arp-cache
1234  */
1235 static void lec_arp_init(struct lec_priv *priv)
1236 {
1237         unsigned short i;
1238
1239         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1240                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1241         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1242         INIT_HLIST_HEAD(&priv->lec_no_forward);
1243         INIT_HLIST_HEAD(&priv->mcast_fwds);
1244         spin_lock_init(&priv->lec_arp_lock);
1245         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1246         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1247 }
1248
1249 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1250 {
1251         if (entry->vcc) {
1252                 struct atm_vcc *vcc = entry->vcc;
1253                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1254                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1255
1256                 vcc->pop = vpriv->old_pop;
1257                 if (vpriv->xoff)
1258                         netif_wake_queue(dev);
1259                 kfree(vpriv);
1260                 vcc->user_back = NULL;
1261                 vcc->push = entry->old_push;
1262                 vcc_release_async(vcc, -EPIPE);
1263                 entry->vcc = NULL;
1264         }
1265         if (entry->recv_vcc) {
1266                 struct atm_vcc *vcc = entry->recv_vcc;
1267                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1268
1269                 kfree(vpriv);
1270                 vcc->user_back = NULL;
1271
1272                 entry->recv_vcc->push = entry->old_recv_push;
1273                 vcc_release_async(entry->recv_vcc, -EPIPE);
1274                 entry->recv_vcc = NULL;
1275         }
1276 }
1277
1278 /*
1279  * Insert entry to lec_arp_table
1280  * LANE2: Add to the end of the list to satisfy 8.1.13
1281  */
1282 static inline void
1283 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1284 {
1285         struct hlist_head *tmp;
1286
1287         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1288         hlist_add_head(&entry->next, tmp);
1289
1290         pr_debug("Added entry:%pM\n", entry->mac_addr);
1291 }
1292
1293 /*
1294  * Remove entry from lec_arp_table
1295  */
1296 static int
1297 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1298 {
1299         struct lec_arp_table *entry;
1300         int i, remove_vcc = 1;
1301
1302         if (!to_remove)
1303                 return -1;
1304
1305         hlist_del(&to_remove->next);
1306         del_timer(&to_remove->timer);
1307
1308         /*
1309          * If this is the only MAC connected to this VCC,
1310          * also tear down the VCC
1311          */
1312         if (to_remove->status >= ESI_FLUSH_PENDING) {
1313                 /*
1314                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1315                  */
1316                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1317                         hlist_for_each_entry(entry,
1318                                              &priv->lec_arp_tables[i], next) {
1319                                 if (memcmp(to_remove->atm_addr,
1320                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1321                                         remove_vcc = 0;
1322                                         break;
1323                                 }
1324                         }
1325                 }
1326                 if (remove_vcc)
1327                         lec_arp_clear_vccs(to_remove);
1328         }
1329         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1330
1331         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1332         return 0;
1333 }
1334
1335 #if DEBUG_ARP_TABLE
1336 static const char *get_status_string(unsigned char st)
1337 {
1338         switch (st) {
1339         case ESI_UNKNOWN:
1340                 return "ESI_UNKNOWN";
1341         case ESI_ARP_PENDING:
1342                 return "ESI_ARP_PENDING";
1343         case ESI_VC_PENDING:
1344                 return "ESI_VC_PENDING";
1345         case ESI_FLUSH_PENDING:
1346                 return "ESI_FLUSH_PENDING";
1347         case ESI_FORWARD_DIRECT:
1348                 return "ESI_FORWARD_DIRECT";
1349         }
1350         return "<UNKNOWN>";
1351 }
1352
1353 static void dump_arp_table(struct lec_priv *priv)
1354 {
1355         struct lec_arp_table *rulla;
1356         char buf[256];
1357         int i, offset;
1358
1359         pr_info("Dump %p:\n", priv);
1360         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1361                 hlist_for_each_entry(rulla,
1362                                      &priv->lec_arp_tables[i], next) {
1363                         offset = 0;
1364                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1365                         offset += sprintf(buf + offset, "Mac: %pM ",
1366                                           rulla->mac_addr);
1367                         offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1368                                           rulla->atm_addr);
1369                         offset += sprintf(buf + offset,
1370                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1371                                           rulla->vcc ? rulla->vcc->vpi : 0,
1372                                           rulla->vcc ? rulla->vcc->vci : 0,
1373                                           rulla->recv_vcc ? rulla->recv_vcc->
1374                                           vpi : 0,
1375                                           rulla->recv_vcc ? rulla->recv_vcc->
1376                                           vci : 0, rulla->last_used,
1377                                           rulla->timestamp, rulla->no_tries);
1378                         offset +=
1379                             sprintf(buf + offset,
1380                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1381                                     rulla->flags, rulla->packets_flooded,
1382                                     get_status_string(rulla->status));
1383                         pr_info("%s\n", buf);
1384                 }
1385         }
1386
1387         if (!hlist_empty(&priv->lec_no_forward))
1388                 pr_info("No forward\n");
1389         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1390                 offset = 0;
1391                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1392                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1393                                   rulla->atm_addr);
1394                 offset += sprintf(buf + offset,
1395                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1396                                   rulla->vcc ? rulla->vcc->vpi : 0,
1397                                   rulla->vcc ? rulla->vcc->vci : 0,
1398                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1399                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1400                                   rulla->last_used,
1401                                   rulla->timestamp, rulla->no_tries);
1402                 offset += sprintf(buf + offset,
1403                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1404                                   rulla->flags, rulla->packets_flooded,
1405                                   get_status_string(rulla->status));
1406                 pr_info("%s\n", buf);
1407         }
1408
1409         if (!hlist_empty(&priv->lec_arp_empty_ones))
1410                 pr_info("Empty ones\n");
1411         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1412                 offset = 0;
1413                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1414                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1415                                   rulla->atm_addr);
1416                 offset += sprintf(buf + offset,
1417                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1418                                   rulla->vcc ? rulla->vcc->vpi : 0,
1419                                   rulla->vcc ? rulla->vcc->vci : 0,
1420                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1421                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1422                                   rulla->last_used,
1423                                   rulla->timestamp, rulla->no_tries);
1424                 offset += sprintf(buf + offset,
1425                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1426                                   rulla->flags, rulla->packets_flooded,
1427                                   get_status_string(rulla->status));
1428                 pr_info("%s", buf);
1429         }
1430
1431         if (!hlist_empty(&priv->mcast_fwds))
1432                 pr_info("Multicast Forward VCCs\n");
1433         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1434                 offset = 0;
1435                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1436                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1437                                   rulla->atm_addr);
1438                 offset += sprintf(buf + offset,
1439                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1440                                   rulla->vcc ? rulla->vcc->vpi : 0,
1441                                   rulla->vcc ? rulla->vcc->vci : 0,
1442                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1443                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1444                                   rulla->last_used,
1445                                   rulla->timestamp, rulla->no_tries);
1446                 offset += sprintf(buf + offset,
1447                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1448                                   rulla->flags, rulla->packets_flooded,
1449                                   get_status_string(rulla->status));
1450                 pr_info("%s\n", buf);
1451         }
1452
1453 }
1454 #else
1455 #define dump_arp_table(priv) do { } while (0)
1456 #endif
1457
1458 /*
1459  * Destruction of arp-cache
1460  */
1461 static void lec_arp_destroy(struct lec_priv *priv)
1462 {
1463         unsigned long flags;
1464         struct hlist_node *next;
1465         struct lec_arp_table *entry;
1466         int i;
1467
1468         cancel_delayed_work_sync(&priv->lec_arp_work);
1469
1470         /*
1471          * Remove all entries
1472          */
1473
1474         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1475         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1476                 hlist_for_each_entry_safe(entry, next,
1477                                           &priv->lec_arp_tables[i], next) {
1478                         lec_arp_remove(priv, entry);
1479                         lec_arp_put(entry);
1480                 }
1481                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1482         }
1483
1484         hlist_for_each_entry_safe(entry, next,
1485                                   &priv->lec_arp_empty_ones, next) {
1486                 del_timer_sync(&entry->timer);
1487                 lec_arp_clear_vccs(entry);
1488                 hlist_del(&entry->next);
1489                 lec_arp_put(entry);
1490         }
1491         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1492
1493         hlist_for_each_entry_safe(entry, next,
1494                                   &priv->lec_no_forward, next) {
1495                 del_timer_sync(&entry->timer);
1496                 lec_arp_clear_vccs(entry);
1497                 hlist_del(&entry->next);
1498                 lec_arp_put(entry);
1499         }
1500         INIT_HLIST_HEAD(&priv->lec_no_forward);
1501
1502         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1503                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1504                 lec_arp_clear_vccs(entry);
1505                 hlist_del(&entry->next);
1506                 lec_arp_put(entry);
1507         }
1508         INIT_HLIST_HEAD(&priv->mcast_fwds);
1509         priv->mcast_vcc = NULL;
1510         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1511 }
1512
1513 /*
1514  * Find entry by mac_address
1515  */
1516 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1517                                           const unsigned char *mac_addr)
1518 {
1519         struct hlist_head *head;
1520         struct lec_arp_table *entry;
1521
1522         pr_debug("%pM\n", mac_addr);
1523
1524         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1525         hlist_for_each_entry(entry, head, next) {
1526                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1527                         return entry;
1528         }
1529         return NULL;
1530 }
1531
1532 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1533                                         const unsigned char *mac_addr)
1534 {
1535         struct lec_arp_table *to_return;
1536
1537         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1538         if (!to_return)
1539                 return NULL;
1540         ether_addr_copy(to_return->mac_addr, mac_addr);
1541         INIT_HLIST_NODE(&to_return->next);
1542         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1543         to_return->last_used = jiffies;
1544         to_return->priv = priv;
1545         skb_queue_head_init(&to_return->tx_wait);
1546         refcount_set(&to_return->usage, 1);
1547         return to_return;
1548 }
1549
1550 /* Arp sent timer expired */
1551 static void lec_arp_expire_arp(struct timer_list *t)
1552 {
1553         struct lec_arp_table *entry;
1554
1555         entry = from_timer(entry, t, timer);
1556
1557         pr_debug("\n");
1558         if (entry->status == ESI_ARP_PENDING) {
1559                 if (entry->no_tries <= entry->priv->max_retry_count) {
1560                         if (entry->is_rdesc)
1561                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1562                                              entry->mac_addr, NULL, NULL);
1563                         else
1564                                 send_to_lecd(entry->priv, l_arp_xmt,
1565                                              entry->mac_addr, NULL, NULL);
1566                         entry->no_tries++;
1567                 }
1568                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1569         }
1570 }
1571
1572 /* Unknown/unused vcc expire, remove associated entry */
1573 static void lec_arp_expire_vcc(struct timer_list *t)
1574 {
1575         unsigned long flags;
1576         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1577         struct lec_priv *priv = to_remove->priv;
1578
1579         del_timer(&to_remove->timer);
1580
1581         pr_debug("%p %p: vpi:%d vci:%d\n",
1582                  to_remove, priv,
1583                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1584                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1585
1586         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1587         hlist_del(&to_remove->next);
1588         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1589
1590         lec_arp_clear_vccs(to_remove);
1591         lec_arp_put(to_remove);
1592 }
1593
1594 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1595                                    unsigned long now,
1596                                    struct lec_priv *priv)
1597 {
1598         unsigned long time_to_check;
1599
1600         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1601                 time_to_check = priv->forward_delay_time;
1602         else
1603                 time_to_check = priv->aging_time;
1604
1605         pr_debug("About to expire: %lx - %lx > %lx\n",
1606                  now, entry->last_used, time_to_check);
1607         if (time_after(now, entry->last_used + time_to_check) &&
1608             !(entry->flags & LEC_PERMANENT_FLAG) &&
1609             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1610                 /* Remove entry */
1611                 pr_debug("Entry timed out\n");
1612                 lec_arp_remove(priv, entry);
1613                 lec_arp_put(entry);
1614         } else {
1615                 /* Something else */
1616                 if ((entry->status == ESI_VC_PENDING ||
1617                      entry->status == ESI_ARP_PENDING) &&
1618                     time_after_eq(now, entry->timestamp +
1619                                        priv->max_unknown_frame_time)) {
1620                         entry->timestamp = jiffies;
1621                         entry->packets_flooded = 0;
1622                         if (entry->status == ESI_VC_PENDING)
1623                                 send_to_lecd(priv, l_svc_setup,
1624                                              entry->mac_addr,
1625                                              entry->atm_addr,
1626                                              NULL);
1627                 }
1628                 if (entry->status == ESI_FLUSH_PENDING &&
1629                     time_after_eq(now, entry->timestamp +
1630                                        priv->path_switching_delay)) {
1631                         lec_arp_hold(entry);
1632                         return true;
1633                 }
1634         }
1635
1636         return false;
1637 }
1638 /*
1639  * Expire entries.
1640  * 1. Re-set timer
1641  * 2. For each entry, delete entries that have aged past the age limit.
1642  * 3. For each entry, depending on the status of the entry, perform
1643  *    the following maintenance.
1644  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1645  *       tick_count is above the max_unknown_frame_time, clear
1646  *       the tick_count to zero and clear the packets_flooded counter
1647  *       to zero. This supports the packet rate limit per address
1648  *       while flooding unknowns.
1649  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1650  *       than or equal to the path_switching_delay, change the status
1651  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1652  *       regardless of the progress of the flush protocol.
1653  */
1654 static void lec_arp_check_expire(struct work_struct *work)
1655 {
1656         unsigned long flags;
1657         struct lec_priv *priv =
1658                 container_of(work, struct lec_priv, lec_arp_work.work);
1659         struct hlist_node *next;
1660         struct lec_arp_table *entry;
1661         unsigned long now;
1662         int i;
1663
1664         pr_debug("%p\n", priv);
1665         now = jiffies;
1666 restart:
1667         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1668         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1669                 hlist_for_each_entry_safe(entry, next,
1670                                           &priv->lec_arp_tables[i], next) {
1671                         if (__lec_arp_check_expire(entry, now, priv)) {
1672                                 struct sk_buff *skb;
1673                                 struct atm_vcc *vcc = entry->vcc;
1674
1675                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1676                                                        flags);
1677                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1678                                         lec_send(vcc, skb);
1679                                 entry->last_used = jiffies;
1680                                 entry->status = ESI_FORWARD_DIRECT;
1681                                 lec_arp_put(entry);
1682
1683                                 goto restart;
1684                         }
1685                 }
1686         }
1687         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1688
1689         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1690 }
1691
1692 /*
1693  * Try to find vcc where mac_address is attached.
1694  *
1695  */
1696 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1697                                        const unsigned char *mac_to_find,
1698                                        int is_rdesc,
1699                                        struct lec_arp_table **ret_entry)
1700 {
1701         unsigned long flags;
1702         struct lec_arp_table *entry;
1703         struct atm_vcc *found;
1704
1705         if (mac_to_find[0] & 0x01) {
1706                 switch (priv->lane_version) {
1707                 case 1:
1708                         return priv->mcast_vcc;
1709                 case 2: /* LANE2 wants arp for multicast addresses */
1710                         if (ether_addr_equal(mac_to_find, bus_mac))
1711                                 return priv->mcast_vcc;
1712                         break;
1713                 default:
1714                         break;
1715                 }
1716         }
1717
1718         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1719         entry = lec_arp_find(priv, mac_to_find);
1720
1721         if (entry) {
1722                 if (entry->status == ESI_FORWARD_DIRECT) {
1723                         /* Connection Ok */
1724                         entry->last_used = jiffies;
1725                         lec_arp_hold(entry);
1726                         *ret_entry = entry;
1727                         found = entry->vcc;
1728                         goto out;
1729                 }
1730                 /*
1731                  * If the LE_ARP cache entry is still pending, reset count to 0
1732                  * so another LE_ARP request can be made for this frame.
1733                  */
1734                 if (entry->status == ESI_ARP_PENDING)
1735                         entry->no_tries = 0;
1736                 /*
1737                  * Data direct VC not yet set up, check to see if the unknown
1738                  * frame count is greater than the limit. If the limit has
1739                  * not been reached, allow the caller to send packet to
1740                  * BUS.
1741                  */
1742                 if (entry->status != ESI_FLUSH_PENDING &&
1743                     entry->packets_flooded <
1744                     priv->maximum_unknown_frame_count) {
1745                         entry->packets_flooded++;
1746                         pr_debug("Flooding..\n");
1747                         found = priv->mcast_vcc;
1748                         goto out;
1749                 }
1750                 /*
1751                  * We got here because entry->status == ESI_FLUSH_PENDING
1752                  * or BUS flood limit was reached for an entry which is
1753                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1754                  */
1755                 lec_arp_hold(entry);
1756                 *ret_entry = entry;
1757                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1758                          entry->vcc);
1759                 found = NULL;
1760         } else {
1761                 /* No matching entry was found */
1762                 entry = make_entry(priv, mac_to_find);
1763                 pr_debug("Making entry\n");
1764                 if (!entry) {
1765                         found = priv->mcast_vcc;
1766                         goto out;
1767                 }
1768                 lec_arp_add(priv, entry);
1769                 /* We want arp-request(s) to be sent */
1770                 entry->packets_flooded = 1;
1771                 entry->status = ESI_ARP_PENDING;
1772                 entry->no_tries = 1;
1773                 entry->last_used = entry->timestamp = jiffies;
1774                 entry->is_rdesc = is_rdesc;
1775                 if (entry->is_rdesc)
1776                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1777                                      NULL);
1778                 else
1779                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1780                 entry->timer.expires = jiffies + (1 * HZ);
1781                 entry->timer.function = lec_arp_expire_arp;
1782                 add_timer(&entry->timer);
1783                 found = priv->mcast_vcc;
1784         }
1785
1786 out:
1787         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1788         return found;
1789 }
1790
1791 static int
1792 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1793                 unsigned long permanent)
1794 {
1795         unsigned long flags;
1796         struct hlist_node *next;
1797         struct lec_arp_table *entry;
1798         int i;
1799
1800         pr_debug("\n");
1801         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1802         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1803                 hlist_for_each_entry_safe(entry, next,
1804                                           &priv->lec_arp_tables[i], next) {
1805                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1806                             (permanent ||
1807                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1808                                 lec_arp_remove(priv, entry);
1809                                 lec_arp_put(entry);
1810                         }
1811                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1812                         return 0;
1813                 }
1814         }
1815         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1816         return -1;
1817 }
1818
1819 /*
1820  * Notifies:  Response to arp_request (atm_addr != NULL)
1821  */
1822 static void
1823 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1824                const unsigned char *atm_addr, unsigned long remoteflag,
1825                unsigned int targetless_le_arp)
1826 {
1827         unsigned long flags;
1828         struct hlist_node *next;
1829         struct lec_arp_table *entry, *tmp;
1830         int i;
1831
1832         pr_debug("%smac:%pM\n",
1833                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1834
1835         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1836         entry = lec_arp_find(priv, mac_addr);
1837         if (entry == NULL && targetless_le_arp)
1838                 goto out;       /*
1839                                  * LANE2: ignore targetless LE_ARPs for which
1840                                  * we have no entry in the cache. 7.1.30
1841                                  */
1842         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1843                 hlist_for_each_entry_safe(entry, next,
1844                                           &priv->lec_arp_empty_ones, next) {
1845                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1846                                 hlist_del(&entry->next);
1847                                 del_timer(&entry->timer);
1848                                 tmp = lec_arp_find(priv, mac_addr);
1849                                 if (tmp) {
1850                                         del_timer(&tmp->timer);
1851                                         tmp->status = ESI_FORWARD_DIRECT;
1852                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1853                                         tmp->vcc = entry->vcc;
1854                                         tmp->old_push = entry->old_push;
1855                                         tmp->last_used = jiffies;
1856                                         del_timer(&entry->timer);
1857                                         lec_arp_put(entry);
1858                                         entry = tmp;
1859                                 } else {
1860                                         entry->status = ESI_FORWARD_DIRECT;
1861                                         ether_addr_copy(entry->mac_addr,
1862                                                         mac_addr);
1863                                         entry->last_used = jiffies;
1864                                         lec_arp_add(priv, entry);
1865                                 }
1866                                 if (remoteflag)
1867                                         entry->flags |= LEC_REMOTE_FLAG;
1868                                 else
1869                                         entry->flags &= ~LEC_REMOTE_FLAG;
1870                                 pr_debug("After update\n");
1871                                 dump_arp_table(priv);
1872                                 goto out;
1873                         }
1874                 }
1875         }
1876
1877         entry = lec_arp_find(priv, mac_addr);
1878         if (!entry) {
1879                 entry = make_entry(priv, mac_addr);
1880                 if (!entry)
1881                         goto out;
1882                 entry->status = ESI_UNKNOWN;
1883                 lec_arp_add(priv, entry);
1884                 /* Temporary, changes before end of function */
1885         }
1886         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1887         del_timer(&entry->timer);
1888         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1889                 hlist_for_each_entry(tmp,
1890                                      &priv->lec_arp_tables[i], next) {
1891                         if (entry != tmp &&
1892                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1893                                 /* Vcc to this host exists */
1894                                 if (tmp->status > ESI_VC_PENDING) {
1895                                         /*
1896                                          * ESI_FLUSH_PENDING,
1897                                          * ESI_FORWARD_DIRECT
1898                                          */
1899                                         entry->vcc = tmp->vcc;
1900                                         entry->old_push = tmp->old_push;
1901                                 }
1902                                 entry->status = tmp->status;
1903                                 break;
1904                         }
1905                 }
1906         }
1907         if (remoteflag)
1908                 entry->flags |= LEC_REMOTE_FLAG;
1909         else
1910                 entry->flags &= ~LEC_REMOTE_FLAG;
1911         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1912                 entry->status = ESI_VC_PENDING;
1913                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1914         }
1915         pr_debug("After update2\n");
1916         dump_arp_table(priv);
1917 out:
1918         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1919 }
1920
1921 /*
1922  * Notifies: Vcc setup ready
1923  */
1924 static void
1925 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1926               struct atm_vcc *vcc,
1927               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1928 {
1929         unsigned long flags;
1930         struct lec_arp_table *entry;
1931         int i, found_entry = 0;
1932
1933         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1934         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1935         if (ioc_data->receive == 2) {
1936                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1937 #if 0
1938                 entry = lec_arp_find(priv, bus_mac);
1939                 if (!entry) {
1940                         pr_info("LEC_ARP: Multicast entry not found!\n");
1941                         goto out;
1942                 }
1943                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1944                 entry->recv_vcc = vcc;
1945                 entry->old_recv_push = old_push;
1946 #endif
1947                 entry = make_entry(priv, bus_mac);
1948                 if (entry == NULL)
1949                         goto out;
1950                 del_timer(&entry->timer);
1951                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1952                 entry->recv_vcc = vcc;
1953                 entry->old_recv_push = old_push;
1954                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1955                 goto out;
1956         } else if (ioc_data->receive == 1) {
1957                 /*
1958                  * Vcc which we don't want to make default vcc,
1959                  * attach it anyway.
1960                  */
1961                 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1962                          ATM_ESA_LEN, ioc_data->atm_addr);
1963                 entry = make_entry(priv, bus_mac);
1964                 if (entry == NULL)
1965                         goto out;
1966                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1967                 eth_zero_addr(entry->mac_addr);
1968                 entry->recv_vcc = vcc;
1969                 entry->old_recv_push = old_push;
1970                 entry->status = ESI_UNKNOWN;
1971                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1972                 entry->timer.function = lec_arp_expire_vcc;
1973                 hlist_add_head(&entry->next, &priv->lec_no_forward);
1974                 add_timer(&entry->timer);
1975                 dump_arp_table(priv);
1976                 goto out;
1977         }
1978         pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1979                  ATM_ESA_LEN, ioc_data->atm_addr);
1980         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1981                 hlist_for_each_entry(entry,
1982                                      &priv->lec_arp_tables[i], next) {
1983                         if (memcmp
1984                             (ioc_data->atm_addr, entry->atm_addr,
1985                              ATM_ESA_LEN) == 0) {
1986                                 pr_debug("LEC_ARP: Attaching data direct\n");
1987                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1988                                          entry->vcc ? entry->vcc->vci : 0,
1989                                          entry->recv_vcc ? entry->recv_vcc->
1990                                          vci : 0);
1991                                 found_entry = 1;
1992                                 del_timer(&entry->timer);
1993                                 entry->vcc = vcc;
1994                                 entry->old_push = old_push;
1995                                 if (entry->status == ESI_VC_PENDING) {
1996                                         if (priv->maximum_unknown_frame_count
1997                                             == 0)
1998                                                 entry->status =
1999                                                     ESI_FORWARD_DIRECT;
2000                                         else {
2001                                                 entry->timestamp = jiffies;
2002                                                 entry->status =
2003                                                     ESI_FLUSH_PENDING;
2004 #if 0
2005                                                 send_to_lecd(priv, l_flush_xmt,
2006                                                              NULL,
2007                                                              entry->atm_addr,
2008                                                              NULL);
2009 #endif
2010                                         }
2011                                 } else {
2012                                         /*
2013                                          * They were forming a connection
2014                                          * to us, and we to them. Our
2015                                          * ATM address is numerically lower
2016                                          * than theirs, so we make connection
2017                                          * we formed into default VCC (8.1.11).
2018                                          * Connection they made gets torn
2019                                          * down. This might confuse some
2020                                          * clients. Can be changed if
2021                                          * someone reports trouble...
2022                                          */
2023                                         ;
2024                                 }
2025                         }
2026                 }
2027         }
2028         if (found_entry) {
2029                 pr_debug("After vcc was added\n");
2030                 dump_arp_table(priv);
2031                 goto out;
2032         }
2033         /*
2034          * Not found, snatch address from first data packet that arrives
2035          * from this vcc
2036          */
2037         entry = make_entry(priv, bus_mac);
2038         if (!entry)
2039                 goto out;
2040         entry->vcc = vcc;
2041         entry->old_push = old_push;
2042         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2043         eth_zero_addr(entry->mac_addr);
2044         entry->status = ESI_UNKNOWN;
2045         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2046         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2047         entry->timer.function = lec_arp_expire_vcc;
2048         add_timer(&entry->timer);
2049         pr_debug("After vcc was added\n");
2050         dump_arp_table(priv);
2051 out:
2052         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2053 }
2054
2055 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2056 {
2057         unsigned long flags;
2058         struct lec_arp_table *entry;
2059         int i;
2060
2061         pr_debug("%lx\n", tran_id);
2062 restart:
2063         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2064         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2065                 hlist_for_each_entry(entry,
2066                                      &priv->lec_arp_tables[i], next) {
2067                         if (entry->flush_tran_id == tran_id &&
2068                             entry->status == ESI_FLUSH_PENDING) {
2069                                 struct sk_buff *skb;
2070                                 struct atm_vcc *vcc = entry->vcc;
2071
2072                                 lec_arp_hold(entry);
2073                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2074                                                        flags);
2075                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2076                                         lec_send(vcc, skb);
2077                                 entry->last_used = jiffies;
2078                                 entry->status = ESI_FORWARD_DIRECT;
2079                                 lec_arp_put(entry);
2080                                 pr_debug("LEC_ARP: Flushed\n");
2081                                 goto restart;
2082                         }
2083                 }
2084         }
2085         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2086         dump_arp_table(priv);
2087 }
2088
2089 static void
2090 lec_set_flush_tran_id(struct lec_priv *priv,
2091                       const unsigned char *atm_addr, unsigned long tran_id)
2092 {
2093         unsigned long flags;
2094         struct lec_arp_table *entry;
2095         int i;
2096
2097         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2098         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2099                 hlist_for_each_entry(entry,
2100                                      &priv->lec_arp_tables[i], next) {
2101                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2102                                 entry->flush_tran_id = tran_id;
2103                                 pr_debug("Set flush transaction id to %lx for %p\n",
2104                                          tran_id, entry);
2105                         }
2106                 }
2107         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2108 }
2109
2110 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2111 {
2112         unsigned long flags;
2113         unsigned char mac_addr[] = {
2114                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2115         };
2116         struct lec_arp_table *to_add;
2117         struct lec_vcc_priv *vpriv;
2118         int err = 0;
2119
2120         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2121         if (!vpriv)
2122                 return -ENOMEM;
2123         vpriv->xoff = 0;
2124         vpriv->old_pop = vcc->pop;
2125         vcc->user_back = vpriv;
2126         vcc->pop = lec_pop;
2127         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2128         to_add = make_entry(priv, mac_addr);
2129         if (!to_add) {
2130                 vcc->pop = vpriv->old_pop;
2131                 kfree(vpriv);
2132                 err = -ENOMEM;
2133                 goto out;
2134         }
2135         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2136         to_add->status = ESI_FORWARD_DIRECT;
2137         to_add->flags |= LEC_PERMANENT_FLAG;
2138         to_add->vcc = vcc;
2139         to_add->old_push = vcc->push;
2140         vcc->push = lec_push;
2141         priv->mcast_vcc = vcc;
2142         lec_arp_add(priv, to_add);
2143 out:
2144         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2145         return err;
2146 }
2147
2148 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2149 {
2150         unsigned long flags;
2151         struct hlist_node *next;
2152         struct lec_arp_table *entry;
2153         int i;
2154
2155         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2156         dump_arp_table(priv);
2157
2158         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2159
2160         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2161                 hlist_for_each_entry_safe(entry, next,
2162                                           &priv->lec_arp_tables[i], next) {
2163                         if (vcc == entry->vcc) {
2164                                 lec_arp_remove(priv, entry);
2165                                 lec_arp_put(entry);
2166                                 if (priv->mcast_vcc == vcc)
2167                                         priv->mcast_vcc = NULL;
2168                         }
2169                 }
2170         }
2171
2172         hlist_for_each_entry_safe(entry, next,
2173                                   &priv->lec_arp_empty_ones, next) {
2174                 if (entry->vcc == vcc) {
2175                         lec_arp_clear_vccs(entry);
2176                         del_timer(&entry->timer);
2177                         hlist_del(&entry->next);
2178                         lec_arp_put(entry);
2179                 }
2180         }
2181
2182         hlist_for_each_entry_safe(entry, next,
2183                                   &priv->lec_no_forward, next) {
2184                 if (entry->recv_vcc == vcc) {
2185                         lec_arp_clear_vccs(entry);
2186                         del_timer(&entry->timer);
2187                         hlist_del(&entry->next);
2188                         lec_arp_put(entry);
2189                 }
2190         }
2191
2192         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2193                 if (entry->recv_vcc == vcc) {
2194                         lec_arp_clear_vccs(entry);
2195                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2196                         hlist_del(&entry->next);
2197                         lec_arp_put(entry);
2198                 }
2199         }
2200
2201         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2202         dump_arp_table(priv);
2203 }
2204
2205 static void
2206 lec_arp_check_empties(struct lec_priv *priv,
2207                       struct atm_vcc *vcc, struct sk_buff *skb)
2208 {
2209         unsigned long flags;
2210         struct hlist_node *next;
2211         struct lec_arp_table *entry, *tmp;
2212         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2213         unsigned char *src = hdr->h_source;
2214
2215         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2216         hlist_for_each_entry_safe(entry, next,
2217                                   &priv->lec_arp_empty_ones, next) {
2218                 if (vcc == entry->vcc) {
2219                         del_timer(&entry->timer);
2220                         ether_addr_copy(entry->mac_addr, src);
2221                         entry->status = ESI_FORWARD_DIRECT;
2222                         entry->last_used = jiffies;
2223                         /* We might have got an entry */
2224                         tmp = lec_arp_find(priv, src);
2225                         if (tmp) {
2226                                 lec_arp_remove(priv, tmp);
2227                                 lec_arp_put(tmp);
2228                         }
2229                         hlist_del(&entry->next);
2230                         lec_arp_add(priv, entry);
2231                         goto out;
2232                 }
2233         }
2234         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2235 out:
2236         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2237 }
2238
2239 MODULE_LICENSE("GPL");