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                 /* FALL THROUGH */
 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         v = lec_get_idx(state, 1);
 958         *pos += !!PTR_ERR(v);
 959         return v;
 960 }
 961
 962 static int lec_seq_show(struct seq_file *seq, void *v)
 963 {
 964         static const char lec_banner[] =
 965             "Itf  MAC          ATM destination"
 966             "                          Status            Flags "
 967             "VPI/VCI Recv VPI/VCI\n";
 968
 969         if (v == SEQ_START_TOKEN)
 970                 seq_puts(seq, lec_banner);
 971         else {
 972                 struct lec_state *state = seq->private;
 973                 struct net_device *dev = state->dev;
 974                 struct lec_arp_table *entry = hlist_entry(state->node,
 975                                                           struct lec_arp_table,
 976                                                           next);
 977
 978                 seq_printf(seq, "%s ", dev->name);
 979                 lec_info(seq, entry);
 980         }
 981         return 0;
 982 }
 983
 984 static const struct seq_operations lec_seq_ops = {
 985         .start = lec_seq_start,
 986         .next = lec_seq_next,
 987         .stop = lec_seq_stop,
 988         .show = lec_seq_show,
 989 };
 990 #endif
 991
 992 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 993 {
 994         struct atm_vcc *vcc = ATM_SD(sock);
 995         int err = 0;
 996
 997         switch (cmd) {
 998         case ATMLEC_CTRL:
 999         case ATMLEC_MCAST:
1000         case ATMLEC_DATA:
1001                 if (!capable(CAP_NET_ADMIN))
1002                         return -EPERM;
1003                 break;
1004         default:
1005                 return -ENOIOCTLCMD;
1006         }
1007
1008         switch (cmd) {
1009         case ATMLEC_CTRL:
1010                 err = lecd_attach(vcc, (int)arg);
1011                 if (err >= 0)
1012                         sock->state = SS_CONNECTED;
1013                 break;
1014         case ATMLEC_MCAST:
1015                 err = lec_mcast_attach(vcc, (int)arg);
1016                 break;
1017         case ATMLEC_DATA:
1018                 err = lec_vcc_attach(vcc, (void __user *)arg);
1019                 break;
1020         }
1021
1022         return err;
1023 }
1024
1025 static struct atm_ioctl lane_ioctl_ops = {
1026         .owner = THIS_MODULE,
1027         .ioctl = lane_ioctl,
1028 };
1029
1030 static int __init lane_module_init(void)
1031 {
1032 #ifdef CONFIG_PROC_FS
1033         struct proc_dir_entry *p;
1034
1035         p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1036                         sizeof(struct lec_state), NULL);
1037         if (!p) {
1038                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1039                 return -ENOMEM;
1040         }
1041 #endif
1042
1043         register_atm_ioctl(&lane_ioctl_ops);
1044         pr_info("lec.c: initialized\n");
1045         return 0;
1046 }
1047
1048 static void __exit lane_module_cleanup(void)
1049 {
1050         int i;
1051
1052 #ifdef CONFIG_PROC_FS
1053         remove_proc_entry("lec", atm_proc_root);
1054 #endif
1055
1056         deregister_atm_ioctl(&lane_ioctl_ops);
1057
1058         for (i = 0; i < MAX_LEC_ITF; i++) {
1059                 if (dev_lec[i] != NULL) {
1060                         unregister_netdev(dev_lec[i]);
1061                         free_netdev(dev_lec[i]);
1062                         dev_lec[i] = NULL;
1063                 }
1064         }
1065 }
1066
1067 module_init(lane_module_init);
1068 module_exit(lane_module_cleanup);
1069
1070 /*
1071  * LANE2: 3.1.3, LE_RESOLVE.request
1072  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1073  * If sizeoftlvs == NULL the default TLVs associated with with this
1074  * lec will be used.
1075  * If dst_mac == NULL, targetless LE_ARP will be sent
1076  */
1077 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1078                          u8 **tlvs, u32 *sizeoftlvs)
1079 {
1080         unsigned long flags;
1081         struct lec_priv *priv = netdev_priv(dev);
1082         struct lec_arp_table *table;
1083         struct sk_buff *skb;
1084         int retval;
1085
1086         if (force == 0) {
1087                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1088                 table = lec_arp_find(priv, dst_mac);
1089                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1090                 if (table == NULL)
1091                         return -1;
1092
1093                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1094                 if (*tlvs == NULL)
1095                         return -1;
1096
1097                 *sizeoftlvs = table->sizeoftlvs;
1098
1099                 return 0;
1100         }
1101
1102         if (sizeoftlvs == NULL)
1103                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1104
1105         else {
1106                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1107                 if (skb == NULL)
1108                         return -1;
1109                 skb->len = *sizeoftlvs;
1110                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1111                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1112         }
1113         return retval;
1114 }
1115
1116 /*
1117  * LANE2: 3.1.4, LE_ASSOCIATE.request
1118  * Associate the *tlvs with the *lan_dst address.
1119  * Will overwrite any previous association
1120  * Returns 1 for success, 0 for failure (out of memory)
1121  *
1122  */
1123 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1124                                const u8 *tlvs, u32 sizeoftlvs)
1125 {
1126         int retval;
1127         struct sk_buff *skb;
1128         struct lec_priv *priv = netdev_priv(dev);
1129
1130         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1131                 return 0;       /* not our mac address */
1132
1133         kfree(priv->tlvs);      /* NULL if there was no previous association */
1134
1135         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1136         if (priv->tlvs == NULL)
1137                 return 0;
1138         priv->sizeoftlvs = sizeoftlvs;
1139
1140         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1141         if (skb == NULL)
1142                 return 0;
1143         skb->len = sizeoftlvs;
1144         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1145         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1146         if (retval != 0)
1147                 pr_info("lec.c: lane2_associate_req() failed\n");
1148         /*
1149          * If the previous association has changed we must
1150          * somehow notify other LANE entities about the change
1151          */
1152         return 1;
1153 }
1154
1155 /*
1156  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1157  *
1158  */
1159 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1160                                 const u8 *tlvs, u32 sizeoftlvs)
1161 {
1162 #if 0
1163         int i = 0;
1164 #endif
1165         struct lec_priv *priv = netdev_priv(dev);
1166 #if 0                           /*
1167                                  * Why have the TLVs in LE_ARP entries
1168                                  * since we do not use them? When you
1169                                  * uncomment this code, make sure the
1170                                  * TLVs get freed when entry is killed
1171                                  */
1172         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1173
1174         if (entry == NULL)
1175                 return;         /* should not happen */
1176
1177         kfree(entry->tlvs);
1178
1179         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1180         if (entry->tlvs == NULL)
1181                 return;
1182         entry->sizeoftlvs = sizeoftlvs;
1183 #endif
1184 #if 0
1185         pr_info("\n");
1186         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1187         while (i < sizeoftlvs)
1188                 pr_cont("%02x ", tlvs[i++]);
1189
1190         pr_cont("\n");
1191 #endif
1192
1193         /* tell MPOA about the TLVs we saw */
1194         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1195                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1196                                                      tlvs, sizeoftlvs);
1197         }
1198 }
1199
1200 /*
1201  * Here starts what used to lec_arpc.c
1202  *
1203  * lec_arpc.c was added here when making
1204  * lane client modular. October 1997
1205  */
1206
1207 #include <linux/types.h>
1208 #include <linux/timer.h>
1209 #include <linux/param.h>
1210 #include <linux/atomic.h>
1211 #include <linux/inetdevice.h>
1212 #include <net/route.h>
1213
1214 #if 0
1215 #define pr_debug(format, args...)
1216 /*
1217   #define pr_debug printk
1218 */
1219 #endif
1220 #define DEBUG_ARP_TABLE 0
1221
1222 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1223
1224 static void lec_arp_check_expire(struct work_struct *work);
1225 static void lec_arp_expire_arp(struct timer_list *t);
1226
1227 /*
1228  * Arp table funcs
1229  */
1230
1231 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1232
1233 /*
1234  * Initialization of arp-cache
1235  */
1236 static void lec_arp_init(struct lec_priv *priv)
1237 {
1238         unsigned short i;
1239
1240         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1241                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1242         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1243         INIT_HLIST_HEAD(&priv->lec_no_forward);
1244         INIT_HLIST_HEAD(&priv->mcast_fwds);
1245         spin_lock_init(&priv->lec_arp_lock);
1246         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1247         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1248 }
1249
1250 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1251 {
1252         if (entry->vcc) {
1253                 struct atm_vcc *vcc = entry->vcc;
1254                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1255                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1256
1257                 vcc->pop = vpriv->old_pop;
1258                 if (vpriv->xoff)
1259                         netif_wake_queue(dev);
1260                 kfree(vpriv);
1261                 vcc->user_back = NULL;
1262                 vcc->push = entry->old_push;
1263                 vcc_release_async(vcc, -EPIPE);
1264                 entry->vcc = NULL;
1265         }
1266         if (entry->recv_vcc) {
1267                 struct atm_vcc *vcc = entry->recv_vcc;
1268                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1269
1270                 kfree(vpriv);
1271                 vcc->user_back = NULL;
1272
1273                 entry->recv_vcc->push = entry->old_recv_push;
1274                 vcc_release_async(entry->recv_vcc, -EPIPE);
1275                 entry->recv_vcc = NULL;
1276         }
1277 }
1278
1279 /*
1280  * Insert entry to lec_arp_table
1281  * LANE2: Add to the end of the list to satisfy 8.1.13
1282  */
1283 static inline void
1284 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1285 {
1286         struct hlist_head *tmp;
1287
1288         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1289         hlist_add_head(&entry->next, tmp);
1290
1291         pr_debug("Added entry:%pM\n", entry->mac_addr);
1292 }
1293
1294 /*
1295  * Remove entry from lec_arp_table
1296  */
1297 static int
1298 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1299 {
1300         struct lec_arp_table *entry;
1301         int i, remove_vcc = 1;
1302
1303         if (!to_remove)
1304                 return -1;
1305
1306         hlist_del(&to_remove->next);
1307         del_timer(&to_remove->timer);
1308
1309         /*
1310          * If this is the only MAC connected to this VCC,
1311          * also tear down the VCC
1312          */
1313         if (to_remove->status >= ESI_FLUSH_PENDING) {
1314                 /*
1315                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1316                  */
1317                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1318                         hlist_for_each_entry(entry,
1319                                              &priv->lec_arp_tables[i], next) {
1320                                 if (memcmp(to_remove->atm_addr,
1321                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1322                                         remove_vcc = 0;
1323                                         break;
1324                                 }
1325                         }
1326                 }
1327                 if (remove_vcc)
1328                         lec_arp_clear_vccs(to_remove);
1329         }
1330         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1331
1332         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1333         return 0;
1334 }
1335
1336 #if DEBUG_ARP_TABLE
1337 static const char *get_status_string(unsigned char st)
1338 {
1339         switch (st) {
1340         case ESI_UNKNOWN:
1341                 return "ESI_UNKNOWN";
1342         case ESI_ARP_PENDING:
1343                 return "ESI_ARP_PENDING";
1344         case ESI_VC_PENDING:
1345                 return "ESI_VC_PENDING";
1346         case ESI_FLUSH_PENDING:
1347                 return "ESI_FLUSH_PENDING";
1348         case ESI_FORWARD_DIRECT:
1349                 return "ESI_FORWARD_DIRECT";
1350         }
1351         return "<UNKNOWN>";
1352 }
1353
1354 static void dump_arp_table(struct lec_priv *priv)
1355 {
1356         struct lec_arp_table *rulla;
1357         char buf[256];
1358         int i, offset;
1359
1360         pr_info("Dump %p:\n", priv);
1361         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1362                 hlist_for_each_entry(rulla,
1363                                      &priv->lec_arp_tables[i], next) {
1364                         offset = 0;
1365                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1366                         offset += sprintf(buf + offset, "Mac: %pM ",
1367                                           rulla->mac_addr);
1368                         offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1369                                           rulla->atm_addr);
1370                         offset += sprintf(buf + offset,
1371                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1372                                           rulla->vcc ? rulla->vcc->vpi : 0,
1373                                           rulla->vcc ? rulla->vcc->vci : 0,
1374                                           rulla->recv_vcc ? rulla->recv_vcc->
1375                                           vpi : 0,
1376                                           rulla->recv_vcc ? rulla->recv_vcc->
1377                                           vci : 0, rulla->last_used,
1378                                           rulla->timestamp, rulla->no_tries);
1379                         offset +=
1380                             sprintf(buf + offset,
1381                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1382                                     rulla->flags, rulla->packets_flooded,
1383                                     get_status_string(rulla->status));
1384                         pr_info("%s\n", buf);
1385                 }
1386         }
1387
1388         if (!hlist_empty(&priv->lec_no_forward))
1389                 pr_info("No forward\n");
1390         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1391                 offset = 0;
1392                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1393                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1394                                   rulla->atm_addr);
1395                 offset += sprintf(buf + offset,
1396                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1397                                   rulla->vcc ? rulla->vcc->vpi : 0,
1398                                   rulla->vcc ? rulla->vcc->vci : 0,
1399                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1400                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1401                                   rulla->last_used,
1402                                   rulla->timestamp, rulla->no_tries);
1403                 offset += sprintf(buf + offset,
1404                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1405                                   rulla->flags, rulla->packets_flooded,
1406                                   get_status_string(rulla->status));
1407                 pr_info("%s\n", buf);
1408         }
1409
1410         if (!hlist_empty(&priv->lec_arp_empty_ones))
1411                 pr_info("Empty ones\n");
1412         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1413                 offset = 0;
1414                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1415                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1416                                   rulla->atm_addr);
1417                 offset += sprintf(buf + offset,
1418                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1419                                   rulla->vcc ? rulla->vcc->vpi : 0,
1420                                   rulla->vcc ? rulla->vcc->vci : 0,
1421                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1422                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1423                                   rulla->last_used,
1424                                   rulla->timestamp, rulla->no_tries);
1425                 offset += sprintf(buf + offset,
1426                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1427                                   rulla->flags, rulla->packets_flooded,
1428                                   get_status_string(rulla->status));
1429                 pr_info("%s", buf);
1430         }
1431
1432         if (!hlist_empty(&priv->mcast_fwds))
1433                 pr_info("Multicast Forward VCCs\n");
1434         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1435                 offset = 0;
1436                 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1437                 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1438                                   rulla->atm_addr);
1439                 offset += sprintf(buf + offset,
1440                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1441                                   rulla->vcc ? rulla->vcc->vpi : 0,
1442                                   rulla->vcc ? rulla->vcc->vci : 0,
1443                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1444                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1445                                   rulla->last_used,
1446                                   rulla->timestamp, rulla->no_tries);
1447                 offset += sprintf(buf + offset,
1448                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1449                                   rulla->flags, rulla->packets_flooded,
1450                                   get_status_string(rulla->status));
1451                 pr_info("%s\n", buf);
1452         }
1453
1454 }
1455 #else
1456 #define dump_arp_table(priv) do { } while (0)
1457 #endif
1458
1459 /*
1460  * Destruction of arp-cache
1461  */
1462 static void lec_arp_destroy(struct lec_priv *priv)
1463 {
1464         unsigned long flags;
1465         struct hlist_node *next;
1466         struct lec_arp_table *entry;
1467         int i;
1468
1469         cancel_delayed_work_sync(&priv->lec_arp_work);
1470
1471         /*
1472          * Remove all entries
1473          */
1474
1475         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1476         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1477                 hlist_for_each_entry_safe(entry, next,
1478                                           &priv->lec_arp_tables[i], next) {
1479                         lec_arp_remove(priv, entry);
1480                         lec_arp_put(entry);
1481                 }
1482                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1483         }
1484
1485         hlist_for_each_entry_safe(entry, next,
1486                                   &priv->lec_arp_empty_ones, next) {
1487                 del_timer_sync(&entry->timer);
1488                 lec_arp_clear_vccs(entry);
1489                 hlist_del(&entry->next);
1490                 lec_arp_put(entry);
1491         }
1492         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1493
1494         hlist_for_each_entry_safe(entry, next,
1495                                   &priv->lec_no_forward, next) {
1496                 del_timer_sync(&entry->timer);
1497                 lec_arp_clear_vccs(entry);
1498                 hlist_del(&entry->next);
1499                 lec_arp_put(entry);
1500         }
1501         INIT_HLIST_HEAD(&priv->lec_no_forward);
1502
1503         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1504                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1505                 lec_arp_clear_vccs(entry);
1506                 hlist_del(&entry->next);
1507                 lec_arp_put(entry);
1508         }
1509         INIT_HLIST_HEAD(&priv->mcast_fwds);
1510         priv->mcast_vcc = NULL;
1511         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1512 }
1513
1514 /*
1515  * Find entry by mac_address
1516  */
1517 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1518                                           const unsigned char *mac_addr)
1519 {
1520         struct hlist_head *head;
1521         struct lec_arp_table *entry;
1522
1523         pr_debug("%pM\n", mac_addr);
1524
1525         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1526         hlist_for_each_entry(entry, head, next) {
1527                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1528                         return entry;
1529         }
1530         return NULL;
1531 }
1532
1533 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1534                                         const unsigned char *mac_addr)
1535 {
1536         struct lec_arp_table *to_return;
1537
1538         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1539         if (!to_return)
1540                 return NULL;
1541         ether_addr_copy(to_return->mac_addr, mac_addr);
1542         INIT_HLIST_NODE(&to_return->next);
1543         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1544         to_return->last_used = jiffies;
1545         to_return->priv = priv;
1546         skb_queue_head_init(&to_return->tx_wait);
1547         refcount_set(&to_return->usage, 1);
1548         return to_return;
1549 }
1550
1551 /* Arp sent timer expired */
1552 static void lec_arp_expire_arp(struct timer_list *t)
1553 {
1554         struct lec_arp_table *entry;
1555
1556         entry = from_timer(entry, t, timer);
1557
1558         pr_debug("\n");
1559         if (entry->status == ESI_ARP_PENDING) {
1560                 if (entry->no_tries <= entry->priv->max_retry_count) {
1561                         if (entry->is_rdesc)
1562                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1563                                              entry->mac_addr, NULL, NULL);
1564                         else
1565                                 send_to_lecd(entry->priv, l_arp_xmt,
1566                                              entry->mac_addr, NULL, NULL);
1567                         entry->no_tries++;
1568                 }
1569                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1570         }
1571 }
1572
1573 /* Unknown/unused vcc expire, remove associated entry */
1574 static void lec_arp_expire_vcc(struct timer_list *t)
1575 {
1576         unsigned long flags;
1577         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1578         struct lec_priv *priv = to_remove->priv;
1579
1580         del_timer(&to_remove->timer);
1581
1582         pr_debug("%p %p: vpi:%d vci:%d\n",
1583                  to_remove, priv,
1584                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1585                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1586
1587         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1588         hlist_del(&to_remove->next);
1589         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1590
1591         lec_arp_clear_vccs(to_remove);
1592         lec_arp_put(to_remove);
1593 }
1594
1595 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1596                                    unsigned long now,
1597                                    struct lec_priv *priv)
1598 {
1599         unsigned long time_to_check;
1600
1601         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1602                 time_to_check = priv->forward_delay_time;
1603         else
1604                 time_to_check = priv->aging_time;
1605
1606         pr_debug("About to expire: %lx - %lx > %lx\n",
1607                  now, entry->last_used, time_to_check);
1608         if (time_after(now, entry->last_used + time_to_check) &&
1609             !(entry->flags & LEC_PERMANENT_FLAG) &&
1610             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1611                 /* Remove entry */
1612                 pr_debug("Entry timed out\n");
1613                 lec_arp_remove(priv, entry);
1614                 lec_arp_put(entry);
1615         } else {
1616                 /* Something else */
1617                 if ((entry->status == ESI_VC_PENDING ||
1618                      entry->status == ESI_ARP_PENDING) &&
1619                     time_after_eq(now, entry->timestamp +
1620                                        priv->max_unknown_frame_time)) {
1621                         entry->timestamp = jiffies;
1622                         entry->packets_flooded = 0;
1623                         if (entry->status == ESI_VC_PENDING)
1624                                 send_to_lecd(priv, l_svc_setup,
1625                                              entry->mac_addr,
1626                                              entry->atm_addr,
1627                                              NULL);
1628                 }
1629                 if (entry->status == ESI_FLUSH_PENDING &&
1630                     time_after_eq(now, entry->timestamp +
1631                                        priv->path_switching_delay)) {
1632                         lec_arp_hold(entry);
1633                         return true;
1634                 }
1635         }
1636
1637         return false;
1638 }
1639 /*
1640  * Expire entries.
1641  * 1. Re-set timer
1642  * 2. For each entry, delete entries that have aged past the age limit.
1643  * 3. For each entry, depending on the status of the entry, perform
1644  *    the following maintenance.
1645  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1646  *       tick_count is above the max_unknown_frame_time, clear
1647  *       the tick_count to zero and clear the packets_flooded counter
1648  *       to zero. This supports the packet rate limit per address
1649  *       while flooding unknowns.
1650  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1651  *       than or equal to the path_switching_delay, change the status
1652  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1653  *       regardless of the progress of the flush protocol.
1654  */
1655 static void lec_arp_check_expire(struct work_struct *work)
1656 {
1657         unsigned long flags;
1658         struct lec_priv *priv =
1659                 container_of(work, struct lec_priv, lec_arp_work.work);
1660         struct hlist_node *next;
1661         struct lec_arp_table *entry;
1662         unsigned long now;
1663         int i;
1664
1665         pr_debug("%p\n", priv);
1666         now = jiffies;
1667 restart:
1668         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1669         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1670                 hlist_for_each_entry_safe(entry, next,
1671                                           &priv->lec_arp_tables[i], next) {
1672                         if (__lec_arp_check_expire(entry, now, priv)) {
1673                                 struct sk_buff *skb;
1674                                 struct atm_vcc *vcc = entry->vcc;
1675
1676                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1677                                                        flags);
1678                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1679                                         lec_send(vcc, skb);
1680                                 entry->last_used = jiffies;
1681                                 entry->status = ESI_FORWARD_DIRECT;
1682                                 lec_arp_put(entry);
1683
1684                                 goto restart;
1685                         }
1686                 }
1687         }
1688         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1689
1690         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1691 }
1692
1693 /*
1694  * Try to find vcc where mac_address is attached.
1695  *
1696  */
1697 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1698                                        const unsigned char *mac_to_find,
1699                                        int is_rdesc,
1700                                        struct lec_arp_table **ret_entry)
1701 {
1702         unsigned long flags;
1703         struct lec_arp_table *entry;
1704         struct atm_vcc *found;
1705
1706         if (mac_to_find[0] & 0x01) {
1707                 switch (priv->lane_version) {
1708                 case 1:
1709                         return priv->mcast_vcc;
1710                 case 2: /* LANE2 wants arp for multicast addresses */
1711                         if (ether_addr_equal(mac_to_find, bus_mac))
1712                                 return priv->mcast_vcc;
1713                         break;
1714                 default:
1715                         break;
1716                 }
1717         }
1718
1719         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1720         entry = lec_arp_find(priv, mac_to_find);
1721
1722         if (entry) {
1723                 if (entry->status == ESI_FORWARD_DIRECT) {
1724                         /* Connection Ok */
1725                         entry->last_used = jiffies;
1726                         lec_arp_hold(entry);
1727                         *ret_entry = entry;
1728                         found = entry->vcc;
1729                         goto out;
1730                 }
1731                 /*
1732                  * If the LE_ARP cache entry is still pending, reset count to 0
1733                  * so another LE_ARP request can be made for this frame.
1734                  */
1735                 if (entry->status == ESI_ARP_PENDING)
1736                         entry->no_tries = 0;
1737                 /*
1738                  * Data direct VC not yet set up, check to see if the unknown
1739                  * frame count is greater than the limit. If the limit has
1740                  * not been reached, allow the caller to send packet to
1741                  * BUS.
1742                  */
1743                 if (entry->status != ESI_FLUSH_PENDING &&
1744                     entry->packets_flooded <
1745                     priv->maximum_unknown_frame_count) {
1746                         entry->packets_flooded++;
1747                         pr_debug("Flooding..\n");
1748                         found = priv->mcast_vcc;
1749                         goto out;
1750                 }
1751                 /*
1752                  * We got here because entry->status == ESI_FLUSH_PENDING
1753                  * or BUS flood limit was reached for an entry which is
1754                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1755                  */
1756                 lec_arp_hold(entry);
1757                 *ret_entry = entry;
1758                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1759                          entry->vcc);
1760                 found = NULL;
1761         } else {
1762                 /* No matching entry was found */
1763                 entry = make_entry(priv, mac_to_find);
1764                 pr_debug("Making entry\n");
1765                 if (!entry) {
1766                         found = priv->mcast_vcc;
1767                         goto out;
1768                 }
1769                 lec_arp_add(priv, entry);
1770                 /* We want arp-request(s) to be sent */
1771                 entry->packets_flooded = 1;
1772                 entry->status = ESI_ARP_PENDING;
1773                 entry->no_tries = 1;
1774                 entry->last_used = entry->timestamp = jiffies;
1775                 entry->is_rdesc = is_rdesc;
1776                 if (entry->is_rdesc)
1777                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1778                                      NULL);
1779                 else
1780                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1781                 entry->timer.expires = jiffies + (1 * HZ);
1782                 entry->timer.function = lec_arp_expire_arp;
1783                 add_timer(&entry->timer);
1784                 found = priv->mcast_vcc;
1785         }
1786
1787 out:
1788         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1789         return found;
1790 }
1791
1792 static int
1793 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1794                 unsigned long permanent)
1795 {
1796         unsigned long flags;
1797         struct hlist_node *next;
1798         struct lec_arp_table *entry;
1799         int i;
1800
1801         pr_debug("\n");
1802         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1803         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1804                 hlist_for_each_entry_safe(entry, next,
1805                                           &priv->lec_arp_tables[i], next) {
1806                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1807                             (permanent ||
1808                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1809                                 lec_arp_remove(priv, entry);
1810                                 lec_arp_put(entry);
1811                         }
1812                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1813                         return 0;
1814                 }
1815         }
1816         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1817         return -1;
1818 }
1819
1820 /*
1821  * Notifies:  Response to arp_request (atm_addr != NULL)
1822  */
1823 static void
1824 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1825                const unsigned char *atm_addr, unsigned long remoteflag,
1826                unsigned int targetless_le_arp)
1827 {
1828         unsigned long flags;
1829         struct hlist_node *next;
1830         struct lec_arp_table *entry, *tmp;
1831         int i;
1832
1833         pr_debug("%smac:%pM\n",
1834                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1835
1836         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1837         entry = lec_arp_find(priv, mac_addr);
1838         if (entry == NULL && targetless_le_arp)
1839                 goto out;       /*
1840                                  * LANE2: ignore targetless LE_ARPs for which
1841                                  * we have no entry in the cache. 7.1.30
1842                                  */
1843         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1844                 hlist_for_each_entry_safe(entry, next,
1845                                           &priv->lec_arp_empty_ones, next) {
1846                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1847                                 hlist_del(&entry->next);
1848                                 del_timer(&entry->timer);
1849                                 tmp = lec_arp_find(priv, mac_addr);
1850                                 if (tmp) {
1851                                         del_timer(&tmp->timer);
1852                                         tmp->status = ESI_FORWARD_DIRECT;
1853                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1854                                         tmp->vcc = entry->vcc;
1855                                         tmp->old_push = entry->old_push;
1856                                         tmp->last_used = jiffies;
1857                                         del_timer(&entry->timer);
1858                                         lec_arp_put(entry);
1859                                         entry = tmp;
1860                                 } else {
1861                                         entry->status = ESI_FORWARD_DIRECT;
1862                                         ether_addr_copy(entry->mac_addr,
1863                                                         mac_addr);
1864                                         entry->last_used = jiffies;
1865                                         lec_arp_add(priv, entry);
1866                                 }
1867                                 if (remoteflag)
1868                                         entry->flags |= LEC_REMOTE_FLAG;
1869                                 else
1870                                         entry->flags &= ~LEC_REMOTE_FLAG;
1871                                 pr_debug("After update\n");
1872                                 dump_arp_table(priv);
1873                                 goto out;
1874                         }
1875                 }
1876         }
1877
1878         entry = lec_arp_find(priv, mac_addr);
1879         if (!entry) {
1880                 entry = make_entry(priv, mac_addr);
1881                 if (!entry)
1882                         goto out;
1883                 entry->status = ESI_UNKNOWN;
1884                 lec_arp_add(priv, entry);
1885                 /* Temporary, changes before end of function */
1886         }
1887         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1888         del_timer(&entry->timer);
1889         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1890                 hlist_for_each_entry(tmp,
1891                                      &priv->lec_arp_tables[i], next) {
1892                         if (entry != tmp &&
1893                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1894                                 /* Vcc to this host exists */
1895                                 if (tmp->status > ESI_VC_PENDING) {
1896                                         /*
1897                                          * ESI_FLUSH_PENDING,
1898                                          * ESI_FORWARD_DIRECT
1899                                          */
1900                                         entry->vcc = tmp->vcc;
1901                                         entry->old_push = tmp->old_push;
1902                                 }
1903                                 entry->status = tmp->status;
1904                                 break;
1905                         }
1906                 }
1907         }
1908         if (remoteflag)
1909                 entry->flags |= LEC_REMOTE_FLAG;
1910         else
1911                 entry->flags &= ~LEC_REMOTE_FLAG;
1912         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1913                 entry->status = ESI_VC_PENDING;
1914                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1915         }
1916         pr_debug("After update2\n");
1917         dump_arp_table(priv);
1918 out:
1919         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1920 }
1921
1922 /*
1923  * Notifies: Vcc setup ready
1924  */
1925 static void
1926 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1927               struct atm_vcc *vcc,
1928               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1929 {
1930         unsigned long flags;
1931         struct lec_arp_table *entry;
1932         int i, found_entry = 0;
1933
1934         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1935         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1936         if (ioc_data->receive == 2) {
1937                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1938 #if 0
1939                 entry = lec_arp_find(priv, bus_mac);
1940                 if (!entry) {
1941                         pr_info("LEC_ARP: Multicast entry not found!\n");
1942                         goto out;
1943                 }
1944                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1945                 entry->recv_vcc = vcc;
1946                 entry->old_recv_push = old_push;
1947 #endif
1948                 entry = make_entry(priv, bus_mac);
1949                 if (entry == NULL)
1950                         goto out;
1951                 del_timer(&entry->timer);
1952                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1953                 entry->recv_vcc = vcc;
1954                 entry->old_recv_push = old_push;
1955                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1956                 goto out;
1957         } else if (ioc_data->receive == 1) {
1958                 /*
1959                  * Vcc which we don't want to make default vcc,
1960                  * attach it anyway.
1961                  */
1962                 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1963                          ATM_ESA_LEN, ioc_data->atm_addr);
1964                 entry = make_entry(priv, bus_mac);
1965                 if (entry == NULL)
1966                         goto out;
1967                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1968                 eth_zero_addr(entry->mac_addr);
1969                 entry->recv_vcc = vcc;
1970                 entry->old_recv_push = old_push;
1971                 entry->status = ESI_UNKNOWN;
1972                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1973                 entry->timer.function = lec_arp_expire_vcc;
1974                 hlist_add_head(&entry->next, &priv->lec_no_forward);
1975                 add_timer(&entry->timer);
1976                 dump_arp_table(priv);
1977                 goto out;
1978         }
1979         pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1980                  ATM_ESA_LEN, ioc_data->atm_addr);
1981         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1982                 hlist_for_each_entry(entry,
1983                                      &priv->lec_arp_tables[i], next) {
1984                         if (memcmp
1985                             (ioc_data->atm_addr, entry->atm_addr,
1986                              ATM_ESA_LEN) == 0) {
1987                                 pr_debug("LEC_ARP: Attaching data direct\n");
1988                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1989                                          entry->vcc ? entry->vcc->vci : 0,
1990                                          entry->recv_vcc ? entry->recv_vcc->
1991                                          vci : 0);
1992                                 found_entry = 1;
1993                                 del_timer(&entry->timer);
1994                                 entry->vcc = vcc;
1995                                 entry->old_push = old_push;
1996                                 if (entry->status == ESI_VC_PENDING) {
1997                                         if (priv->maximum_unknown_frame_count
1998                                             == 0)
1999                                                 entry->status =
2000                                                     ESI_FORWARD_DIRECT;
2001                                         else {
2002                                                 entry->timestamp = jiffies;
2003                                                 entry->status =
2004                                                     ESI_FLUSH_PENDING;
2005 #if 0
2006                                                 send_to_lecd(priv, l_flush_xmt,
2007                                                              NULL,
2008                                                              entry->atm_addr,
2009                                                              NULL);
2010 #endif
2011                                         }
2012                                 } else {
2013                                         /*
2014                                          * They were forming a connection
2015                                          * to us, and we to them. Our
2016                                          * ATM address is numerically lower
2017                                          * than theirs, so we make connection
2018                                          * we formed into default VCC (8.1.11).
2019                                          * Connection they made gets torn
2020                                          * down. This might confuse some
2021                                          * clients. Can be changed if
2022                                          * someone reports trouble...
2023                                          */
2024                                         ;
2025                                 }
2026                         }
2027                 }
2028         }
2029         if (found_entry) {
2030                 pr_debug("After vcc was added\n");
2031                 dump_arp_table(priv);
2032                 goto out;
2033         }
2034         /*
2035          * Not found, snatch address from first data packet that arrives
2036          * from this vcc
2037          */
2038         entry = make_entry(priv, bus_mac);
2039         if (!entry)
2040                 goto out;
2041         entry->vcc = vcc;
2042         entry->old_push = old_push;
2043         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2044         eth_zero_addr(entry->mac_addr);
2045         entry->status = ESI_UNKNOWN;
2046         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2047         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2048         entry->timer.function = lec_arp_expire_vcc;
2049         add_timer(&entry->timer);
2050         pr_debug("After vcc was added\n");
2051         dump_arp_table(priv);
2052 out:
2053         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2054 }
2055
2056 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2057 {
2058         unsigned long flags;
2059         struct lec_arp_table *entry;
2060         int i;
2061
2062         pr_debug("%lx\n", tran_id);
2063 restart:
2064         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2065         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2066                 hlist_for_each_entry(entry,
2067                                      &priv->lec_arp_tables[i], next) {
2068                         if (entry->flush_tran_id == tran_id &&
2069                             entry->status == ESI_FLUSH_PENDING) {
2070                                 struct sk_buff *skb;
2071                                 struct atm_vcc *vcc = entry->vcc;
2072
2073                                 lec_arp_hold(entry);
2074                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2075                                                        flags);
2076                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2077                                         lec_send(vcc, skb);
2078                                 entry->last_used = jiffies;
2079                                 entry->status = ESI_FORWARD_DIRECT;
2080                                 lec_arp_put(entry);
2081                                 pr_debug("LEC_ARP: Flushed\n");
2082                                 goto restart;
2083                         }
2084                 }
2085         }
2086         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2087         dump_arp_table(priv);
2088 }
2089
2090 static void
2091 lec_set_flush_tran_id(struct lec_priv *priv,
2092                       const unsigned char *atm_addr, unsigned long tran_id)
2093 {
2094         unsigned long flags;
2095         struct lec_arp_table *entry;
2096         int i;
2097
2098         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2099         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2100                 hlist_for_each_entry(entry,
2101                                      &priv->lec_arp_tables[i], next) {
2102                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2103                                 entry->flush_tran_id = tran_id;
2104                                 pr_debug("Set flush transaction id to %lx for %p\n",
2105                                          tran_id, entry);
2106                         }
2107                 }
2108         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2109 }
2110
2111 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2112 {
2113         unsigned long flags;
2114         unsigned char mac_addr[] = {
2115                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2116         };
2117         struct lec_arp_table *to_add;
2118         struct lec_vcc_priv *vpriv;
2119         int err = 0;
2120
2121         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2122         if (!vpriv)
2123                 return -ENOMEM;
2124         vpriv->xoff = 0;
2125         vpriv->old_pop = vcc->pop;
2126         vcc->user_back = vpriv;
2127         vcc->pop = lec_pop;
2128         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2129         to_add = make_entry(priv, mac_addr);
2130         if (!to_add) {
2131                 vcc->pop = vpriv->old_pop;
2132                 kfree(vpriv);
2133                 err = -ENOMEM;
2134                 goto out;
2135         }
2136         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2137         to_add->status = ESI_FORWARD_DIRECT;
2138         to_add->flags |= LEC_PERMANENT_FLAG;
2139         to_add->vcc = vcc;
2140         to_add->old_push = vcc->push;
2141         vcc->push = lec_push;
2142         priv->mcast_vcc = vcc;
2143         lec_arp_add(priv, to_add);
2144 out:
2145         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2146         return err;
2147 }
2148
2149 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2150 {
2151         unsigned long flags;
2152         struct hlist_node *next;
2153         struct lec_arp_table *entry;
2154         int i;
2155
2156         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2157         dump_arp_table(priv);
2158
2159         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2160
2161         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2162                 hlist_for_each_entry_safe(entry, next,
2163                                           &priv->lec_arp_tables[i], next) {
2164                         if (vcc == entry->vcc) {
2165                                 lec_arp_remove(priv, entry);
2166                                 lec_arp_put(entry);
2167                                 if (priv->mcast_vcc == vcc)
2168                                         priv->mcast_vcc = NULL;
2169                         }
2170                 }
2171         }
2172
2173         hlist_for_each_entry_safe(entry, next,
2174                                   &priv->lec_arp_empty_ones, next) {
2175                 if (entry->vcc == vcc) {
2176                         lec_arp_clear_vccs(entry);
2177                         del_timer(&entry->timer);
2178                         hlist_del(&entry->next);
2179                         lec_arp_put(entry);
2180                 }
2181         }
2182
2183         hlist_for_each_entry_safe(entry, next,
2184                                   &priv->lec_no_forward, next) {
2185                 if (entry->recv_vcc == vcc) {
2186                         lec_arp_clear_vccs(entry);
2187                         del_timer(&entry->timer);
2188                         hlist_del(&entry->next);
2189                         lec_arp_put(entry);
2190                 }
2191         }
2192
2193         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2194                 if (entry->recv_vcc == vcc) {
2195                         lec_arp_clear_vccs(entry);
2196                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2197                         hlist_del(&entry->next);
2198                         lec_arp_put(entry);
2199                 }
2200         }
2201
2202         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2203         dump_arp_table(priv);
2204 }
2205
2206 static void
2207 lec_arp_check_empties(struct lec_priv *priv,
2208                       struct atm_vcc *vcc, struct sk_buff *skb)
2209 {
2210         unsigned long flags;
2211         struct hlist_node *next;
2212         struct lec_arp_table *entry, *tmp;
2213         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2214         unsigned char *src = hdr->h_source;
2215
2216         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2217         hlist_for_each_entry_safe(entry, next,
2218                                   &priv->lec_arp_empty_ones, next) {
2219                 if (vcc == entry->vcc) {
2220                         del_timer(&entry->timer);
2221                         ether_addr_copy(entry->mac_addr, src);
2222                         entry->status = ESI_FORWARD_DIRECT;
2223                         entry->last_used = jiffies;
2224                         /* We might have got an entry */
2225                         tmp = lec_arp_find(priv, src);
2226                         if (tmp) {
2227                                 lec_arp_remove(priv, tmp);
2228                                 lec_arp_put(tmp);
2229                         }
2230                         hlist_del(&entry->next);
2231                         lec_arp_add(priv, entry);
2232                         goto out;
2233                 }
2234         }
2235         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2236 out:
2237         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2238 }
2239
2240 MODULE_LICENSE("GPL");