net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9 #include <linux/slab.h>
  10 #include <linux/kernel.h>
  11 #include <linux/bitops.h>
  12 #include <linux/capability.h>
  13
  14 /* We are ethernet device */
  15 #include <linux/if_ether.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <net/sock.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/ip.h>
  21 #include <asm/byteorder.h>
  22 #include <linux/uaccess.h>
  23 #include <net/arp.h>
  24 #include <net/dst.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/seq_file.h>
  28
  29 /* And atm device */
  30 #include <linux/atmdev.h>
  31 #include <linux/atmlec.h>
  32
  33 /* Proxy LEC knows about bridging */
  34 #if IS_ENABLED(CONFIG_BRIDGE)
  35 #include "../bridge/br_private.h"
  36
  37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  38 #endif
  39
  40 /* Modular too */
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43
  44 /* Hardening for Spectre-v1 */
  45 #include <linux/nospec.h>
  46
  47 #include "lec.h"
  48 #include "lec_arpc.h"
  49 #include "resources.h"
  50
  51 #define DUMP_PACKETS 0          /*
  52                                  * 0 = None,
  53                                  * 1 = 30 first bytes
  54                                  * 2 = Whole packet
  55                                  */
  56
  57 #define LEC_UNRES_QUE_LEN 8     /*
  58                                  * number of tx packets to queue for a
  59                                  * single destination while waiting for SVC
  60                                  */
  61
  62 static int lec_open(struct net_device *dev);
  63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  64                                   struct net_device *dev);
  65 static int lec_close(struct net_device *dev);
  66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  67                                           const unsigned char *mac_addr);
  68 static int lec_arp_remove(struct lec_priv *priv,
  69                           struct lec_arp_table *to_remove);
  70 /* LANE2 functions */
  71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  72                                 const u8 *tlvs, u32 sizeoftlvs);
  73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  74                          u8 **tlvs, u32 *sizeoftlvs);
  75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  76                                const u8 *tlvs, u32 sizeoftlvs);
  77
  78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  79                            unsigned long permanent);
  80 static void lec_arp_check_empties(struct lec_priv *priv,
  81                                   struct atm_vcc *vcc, struct sk_buff *skb);
  82 static void lec_arp_destroy(struct lec_priv *priv);
  83 static void lec_arp_init(struct lec_priv *priv);
  84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  85                                        const unsigned char *mac_to_find,
  86                                        int is_rdesc,
  87                                        struct lec_arp_table **ret_entry);
  88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  89                            const unsigned char *atm_addr,
  90                            unsigned long remoteflag,
  91                            unsigned int targetless_le_arp);
  92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  94 static void lec_set_flush_tran_id(struct lec_priv *priv,
  95                                   const unsigned char *atm_addr,
  96                                   unsigned long tran_id);
  97 static void lec_vcc_added(struct lec_priv *priv,
  98                           const struct atmlec_ioc *ioc_data,
  99                           struct atm_vcc *vcc,
 100                           void (*old_push)(struct atm_vcc *vcc,
 101                                            struct sk_buff *skb));
 102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 103
 104 /* must be done under lec_arp_lock */
 105 static inline void lec_arp_hold(struct lec_arp_table *entry)
 106 {
 107         refcount_inc(&entry->usage);
 108 }
 109
 110 static inline void lec_arp_put(struct lec_arp_table *entry)
 111 {
 112         if (refcount_dec_and_test(&entry->usage))
 113                 kfree(entry);
 114 }
 115
 116 static struct lane2_ops lane2_ops = {
 117         .resolve = lane2_resolve,               /* spec 3.1.3 */
 118         .associate_req = lane2_associate_req,   /* spec 3.1.4 */
 119         .associate_indicator = NULL             /* spec 3.1.5 */
 120 };
 121
 122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 123
 124 /* Device structures */
 125 static struct net_device *dev_lec[MAX_LEC_ITF];
 126
 127 #if IS_ENABLED(CONFIG_BRIDGE)
 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         char *buff;
 131         struct lec_priv *priv;
 132
 133         /*
 134          * Check if this is a BPDU. If so, ask zeppelin to send
 135          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 136          * as the Config BPDU has
 137          */
 138         buff = skb->data + skb->dev->hard_header_len;
 139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 140                 struct sock *sk;
 141                 struct sk_buff *skb2;
 142                 struct atmlec_msg *mesg;
 143
 144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 145                 if (skb2 == NULL)
 146                         return;
 147                 skb2->len = sizeof(struct atmlec_msg);
 148                 mesg = (struct atmlec_msg *)skb2->data;
 149                 mesg->type = l_topology_change;
 150                 buff += 4;
 151                 mesg->content.normal.flag = *buff & 0x01;
 152                                         /* 0x01 is topology change */
 153
 154                 priv = netdev_priv(dev);
 155                 atm_force_charge(priv->lecd, skb2->truesize);
 156                 sk = sk_atm(priv->lecd);
 157                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 158                 sk->sk_data_ready(sk);
 159         }
 160 }
 161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 162
 163 /*
 164  * Open/initialize the netdevice. This is called (in the current kernel)
 165  * sometime after booting when the 'ifconfig' program is run.
 166  *
 167  * This routine should set everything up anew at each open, even
 168  * registers that "should" only need to be set once at boot, so that
 169  * there is non-reboot way to recover if something goes wrong.
 170  */
 171
 172 static int lec_open(struct net_device *dev)
 173 {
 174         netif_start_queue(dev);
 175
 176         return 0;
 177 }
 178
 179 static void
 180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 181 {
 182         struct net_device *dev = skb->dev;
 183
 184         ATM_SKB(skb)->vcc = vcc;
 185         atm_account_tx(vcc, skb);
 186
 187         if (vcc->send(vcc, skb) < 0) {
 188                 dev->stats.tx_dropped++;
 189                 return;
 190         }
 191
 192         dev->stats.tx_packets++;
 193         dev->stats.tx_bytes += skb->len;
 194 }
 195
 196 static void lec_tx_timeout(struct net_device *dev)
 197 {
 198         pr_info("%s\n", dev->name);
 199         netif_trans_update(dev);
 200         netif_wake_queue(dev);
 201 }
 202
 203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 204                                   struct net_device *dev)
 205 {
 206         struct sk_buff *skb2;
 207         struct lec_priv *priv = netdev_priv(dev);
 208         struct lecdatahdr_8023 *lec_h;
 209         struct atm_vcc *vcc;
 210         struct lec_arp_table *entry;
 211         unsigned char *dst;
 212         int min_frame_size;
 213         int is_rdesc;
 214
 215         pr_debug("called\n");
 216         if (!priv->lecd) {
 217                 pr_info("%s:No lecd attached\n", dev->name);
 218                 dev->stats.tx_errors++;
 219                 netif_stop_queue(dev);
 220                 kfree_skb(skb);
 221                 return NETDEV_TX_OK;
 222         }
 223
 224         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 225                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 226                  (long)skb_end_pointer(skb));
 227 #if IS_ENABLED(CONFIG_BRIDGE)
 228         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 229                 lec_handle_bridge(skb, dev);
 230 #endif
 231
 232         /* Make sure we have room for lec_id */
 233         if (skb_headroom(skb) < 2) {
 234                 pr_debug("reallocating skb\n");
 235                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 236                 if (unlikely(!skb2)) {
 237                         kfree_skb(skb);
 238                         return NETDEV_TX_OK;
 239                 }
 240                 consume_skb(skb);
 241                 skb = skb2;
 242         }
 243         skb_push(skb, 2);
 244
 245         /* Put le header to place */
 246         lec_h = (struct lecdatahdr_8023 *)skb->data;
 247         lec_h->le_header = htons(priv->lecid);
 248
 249 #if DUMP_PACKETS >= 2
 250 #define MAX_DUMP_SKB 99
 251 #elif DUMP_PACKETS >= 1
 252 #define MAX_DUMP_SKB 30
 253 #endif
 254 #if DUMP_PACKETS >= 1
 255         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 256                dev->name, skb->len, priv->lecid);
 257         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 258                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 259 #endif /* DUMP_PACKETS >= 1 */
 260
 261         /* Minimum ethernet-frame size */
 262         min_frame_size = LEC_MINIMUM_8023_SIZE;
 263         if (skb->len < min_frame_size) {
 264                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 265                         skb2 = skb_copy_expand(skb, 0,
 266                                                min_frame_size - skb->truesize,
 267                                                GFP_ATOMIC);
 268                         dev_kfree_skb(skb);
 269                         if (skb2 == NULL) {
 270                                 dev->stats.tx_dropped++;
 271                                 return NETDEV_TX_OK;
 272                         }
 273                         skb = skb2;
 274                 }
 275                 skb_put(skb, min_frame_size - skb->len);
 276         }
 277
 278         /* Send to right vcc */
 279         is_rdesc = 0;
 280         dst = lec_h->h_dest;
 281         entry = NULL;
 282         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 283         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 284                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 285         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 286                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 287                         pr_debug("%s:queuing packet, MAC address %pM\n",
 288                                  dev->name, lec_h->h_dest);
 289                         skb_queue_tail(&entry->tx_wait, skb);
 290                 } else {
 291                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 292                                  dev->name, lec_h->h_dest);
 293                         dev->stats.tx_dropped++;
 294                         dev_kfree_skb(skb);
 295                 }
 296                 goto out;
 297         }
 298 #if DUMP_PACKETS > 0
 299         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 300                dev->name, vcc->vpi, vcc->vci);
 301 #endif /* DUMP_PACKETS > 0 */
 302
 303         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 304                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 305                 lec_send(vcc, skb2);
 306         }
 307
 308         lec_send(vcc, skb);
 309
 310         if (!atm_may_send(vcc, 0)) {
 311                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 312
 313                 vpriv->xoff = 1;
 314                 netif_stop_queue(dev);
 315
 316                 /*
 317                  * vcc->pop() might have occurred in between, making
 318                  * the vcc usuable again.  Since xmit is serialized,
 319                  * this is the only situation we have to re-test.
 320                  */
 321
 322                 if (atm_may_send(vcc, 0))
 323                         netif_wake_queue(dev);
 324         }
 325
 326 out:
 327         if (entry)
 328                 lec_arp_put(entry);
 329         netif_trans_update(dev);
 330         return NETDEV_TX_OK;
 331 }
 332
 333 /* The inverse routine to net_open(). */
 334 static int lec_close(struct net_device *dev)
 335 {
 336         netif_stop_queue(dev);
 337         return 0;
 338 }
 339
 340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 341 {
 342         unsigned long flags;
 343         struct net_device *dev = (struct net_device *)vcc->proto_data;
 344         struct lec_priv *priv = netdev_priv(dev);
 345         struct atmlec_msg *mesg;
 346         struct lec_arp_table *entry;
 347         int i;
 348         char *tmp;              /* FIXME */
 349
 350         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 351         mesg = (struct atmlec_msg *)skb->data;
 352         tmp = skb->data;
 353         tmp += sizeof(struct atmlec_msg);
 354         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 355         switch (mesg->type) {
 356         case l_set_mac_addr:
 357                 for (i = 0; i < 6; i++)
 358                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 359                 break;
 360         case l_del_mac_addr:
 361                 for (i = 0; i < 6; i++)
 362                         dev->dev_addr[i] = 0;
 363                 break;
 364         case l_addr_delete:
 365                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 366                                 mesg->content.normal.flag);
 367                 break;
 368         case l_topology_change:
 369                 priv->topology_change = mesg->content.normal.flag;
 370                 break;
 371         case l_flush_complete:
 372                 lec_flush_complete(priv, mesg->content.normal.flag);
 373                 break;
 374         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 375                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 376                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 377                 lec_arp_remove(priv, entry);
 378                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 379
 380                 if (mesg->content.normal.no_source_le_narp)
 381                         break;
 382                 /* FALL THROUGH */
 383         case l_arp_update:
 384                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 385                                mesg->content.normal.atm_addr,
 386                                mesg->content.normal.flag,
 387                                mesg->content.normal.targetless_le_arp);
 388                 pr_debug("in l_arp_update\n");
 389                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 390                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 391                                  mesg->sizeoftlvs);
 392                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 393                                             tmp, mesg->sizeoftlvs);
 394                 }
 395                 break;
 396         case l_config:
 397                 priv->maximum_unknown_frame_count =
 398                     mesg->content.config.maximum_unknown_frame_count;
 399                 priv->max_unknown_frame_time =
 400                     (mesg->content.config.max_unknown_frame_time * HZ);
 401                 priv->max_retry_count = mesg->content.config.max_retry_count;
 402                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 403                 priv->forward_delay_time =
 404                     (mesg->content.config.forward_delay_time * HZ);
 405                 priv->arp_response_time =
 406                     (mesg->content.config.arp_response_time * HZ);
 407                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 408                 priv->path_switching_delay =
 409                     (mesg->content.config.path_switching_delay * HZ);
 410                 priv->lane_version = mesg->content.config.lane_version;
 411                                         /* LANE2 */
 412                 priv->lane2_ops = NULL;
 413                 if (priv->lane_version > 1)
 414                         priv->lane2_ops = &lane2_ops;
 415                 rtnl_lock();
 416                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 417                         pr_info("%s: change_mtu to %d failed\n",
 418                                 dev->name, mesg->content.config.mtu);
 419                 rtnl_unlock();
 420                 priv->is_proxy = mesg->content.config.is_proxy;
 421                 break;
 422         case l_flush_tran_id:
 423                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 424                                       mesg->content.normal.flag);
 425                 break;
 426         case l_set_lecid:
 427                 priv->lecid =
 428                     (unsigned short)(0xffff & mesg->content.normal.flag);
 429                 break;
 430         case l_should_bridge:
 431 #if IS_ENABLED(CONFIG_BRIDGE)
 432         {
 433                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 434                          dev->name, mesg->content.proxy.mac_addr);
 435
 436                 if (br_fdb_test_addr_hook == NULL)
 437                         break;
 438
 439                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 440                         /* hit from bridge table, send LE_ARP_RESPONSE */
 441                         struct sk_buff *skb2;
 442                         struct sock *sk;
 443
 444                         pr_debug("%s: entry found, responding to zeppelin\n",
 445                                  dev->name);
 446                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 447                         if (skb2 == NULL)
 448                                 break;
 449                         skb2->len = sizeof(struct atmlec_msg);
 450                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 451                         atm_force_charge(priv->lecd, skb2->truesize);
 452                         sk = sk_atm(priv->lecd);
 453                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 454                         sk->sk_data_ready(sk);
 455                 }
 456         }
 457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 458                 break;
 459         default:
 460                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 461                 dev_kfree_skb(skb);
 462                 return -EINVAL;
 463         }
 464         dev_kfree_skb(skb);
 465         return 0;
 466 }
 467
 468 static void lec_atm_close(struct atm_vcc *vcc)
 469 {
 470         struct sk_buff *skb;
 471         struct net_device *dev = (struct net_device *)vcc->proto_data;
 472         struct lec_priv *priv = netdev_priv(dev);
 473
 474         priv->lecd = NULL;
 475         /* Do something needful? */
 476
 477         netif_stop_queue(dev);
 478         lec_arp_destroy(priv);
 479
 480         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 481                 pr_info("%s closing with messages pending\n", dev->name);
 482         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 483                 atm_return(vcc, skb->truesize);
 484                 dev_kfree_skb(skb);
 485         }
 486
 487         pr_info("%s: Shut down!\n", dev->name);
 488         module_put(THIS_MODULE);
 489 }
 490
 491 static const struct atmdev_ops lecdev_ops = {
 492         .close = lec_atm_close,
 493         .send = lec_atm_send
 494 };
 495
 496 static struct atm_dev lecatm_dev = {
 497         .ops = &lecdev_ops,
 498         .type = "lec",
 499         .number = 999,          /* dummy device number */
 500         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 501 };
 502
 503 /*
 504  * LANE2: new argument struct sk_buff *data contains
 505  * the LE_ARP based TLVs introduced in the LANE2 spec
 506  */
 507 static int
 508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 509              const unsigned char *mac_addr, const unsigned char *atm_addr,
 510              struct sk_buff *data)
 511 {
 512         struct sock *sk;
 513         struct sk_buff *skb;
 514         struct atmlec_msg *mesg;
 515
 516         if (!priv || !priv->lecd)
 517                 return -1;
 518         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 519         if (!skb)
 520                 return -1;
 521         skb->len = sizeof(struct atmlec_msg);
 522         mesg = (struct atmlec_msg *)skb->data;
 523         memset(mesg, 0, sizeof(struct atmlec_msg));
 524         mesg->type = type;
 525         if (data != NULL)
 526                 mesg->sizeoftlvs = data->len;
 527         if (mac_addr)
 528                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 529         else
 530                 mesg->content.normal.targetless_le_arp = 1;
 531         if (atm_addr)
 532                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 533
 534         atm_force_charge(priv->lecd, skb->truesize);
 535         sk = sk_atm(priv->lecd);
 536         skb_queue_tail(&sk->sk_receive_queue, skb);
 537         sk->sk_data_ready(sk);
 538
 539         if (data != NULL) {
 540                 pr_debug("about to send %d bytes of data\n", data->len);
 541                 atm_force_charge(priv->lecd, data->truesize);
 542                 skb_queue_tail(&sk->sk_receive_queue, data);
 543                 sk->sk_data_ready(sk);
 544         }
 545
 546         return 0;
 547 }
 548
 549 static void lec_set_multicast_list(struct net_device *dev)
 550 {
 551         /*
 552          * by default, all multicast frames arrive over the bus.
 553          * eventually support selective multicast service
 554          */
 555 }
 556
 557 static const struct net_device_ops lec_netdev_ops = {
 558         .ndo_open               = lec_open,
 559         .ndo_stop               = lec_close,
 560         .ndo_start_xmit         = lec_start_xmit,
 561         .ndo_tx_timeout         = lec_tx_timeout,
 562         .ndo_set_rx_mode        = lec_set_multicast_list,
 563 };
 564
 565 static const unsigned char lec_ctrl_magic[] = {
 566         0xff,
 567         0x00,
 568         0x01,
 569         0x01
 570 };
 571
 572 #define LEC_DATA_DIRECT_8023  2
 573 #define LEC_DATA_DIRECT_8025  3
 574
 575 static int lec_is_data_direct(struct atm_vcc *vcc)
 576 {
 577         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 578                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 579 }
 580
 581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 582 {
 583         unsigned long flags;
 584         struct net_device *dev = (struct net_device *)vcc->proto_data;
 585         struct lec_priv *priv = netdev_priv(dev);
 586
 587 #if DUMP_PACKETS > 0
 588         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 589                dev->name, vcc->vpi, vcc->vci);
 590 #endif
 591         if (!skb) {
 592                 pr_debug("%s: null skb\n", dev->name);
 593                 lec_vcc_close(priv, vcc);
 594                 return;
 595         }
 596 #if DUMP_PACKETS >= 2
 597 #define MAX_SKB_DUMP 99
 598 #elif DUMP_PACKETS >= 1
 599 #define MAX_SKB_DUMP 30
 600 #endif
 601 #if DUMP_PACKETS > 0
 602         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 603                dev->name, skb->len, priv->lecid);
 604         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 605                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 606 #endif /* DUMP_PACKETS > 0 */
 607         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 608                                 /* Control frame, to daemon */
 609                 struct sock *sk = sk_atm(vcc);
 610
 611                 pr_debug("%s: To daemon\n", dev->name);
 612                 skb_queue_tail(&sk->sk_receive_queue, skb);
 613                 sk->sk_data_ready(sk);
 614         } else {                /* Data frame, queue to protocol handlers */
 615                 struct lec_arp_table *entry;
 616                 unsigned char *src, *dst;
 617
 618                 atm_return(vcc, skb->truesize);
 619                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 620                     !priv->lecd || !(dev->flags & IFF_UP)) {
 621                         /*
 622                          * Probably looping back, or if lecd is missing,
 623                          * lecd has gone down
 624                          */
 625                         pr_debug("Ignoring frame...\n");
 626                         dev_kfree_skb(skb);
 627                         return;
 628                 }
 629                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 630
 631                 /*
 632                  * If this is a Data Direct VCC, and the VCC does not match
 633                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 634                  */
 635                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 636                 if (lec_is_data_direct(vcc)) {
 637                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 638                         entry = lec_arp_find(priv, src);
 639                         if (entry && entry->vcc != vcc) {
 640                                 lec_arp_remove(priv, entry);
 641                                 lec_arp_put(entry);
 642                         }
 643                 }
 644                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 645
 646                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 647                     !priv->is_proxy &&  /* Proxy wants all the packets */
 648                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 649                         dev_kfree_skb(skb);
 650                         return;
 651                 }
 652                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 653                         lec_arp_check_empties(priv, vcc, skb);
 654                 skb_pull(skb, 2);       /* skip lec_id */
 655                 skb->protocol = eth_type_trans(skb, dev);
 656                 dev->stats.rx_packets++;
 657                 dev->stats.rx_bytes += skb->len;
 658                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 659                 netif_rx(skb);
 660         }
 661 }
 662
 663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 664 {
 665         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 666         struct net_device *dev = skb->dev;
 667
 668         if (vpriv == NULL) {
 669                 pr_info("vpriv = NULL!?!?!?\n");
 670                 return;
 671         }
 672
 673         vpriv->old_pop(vcc, skb);
 674
 675         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 676                 vpriv->xoff = 0;
 677                 if (netif_running(dev) && netif_queue_stopped(dev))
 678                         netif_wake_queue(dev);
 679         }
 680 }
 681
 682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 683 {
 684         struct lec_vcc_priv *vpriv;
 685         int bytes_left;
 686         struct atmlec_ioc ioc_data;
 687
 688         /* Lecd must be up in this case */
 689         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 690         if (bytes_left != 0)
 691                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 692         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 693                 return -EINVAL;
 694         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 695         if (!dev_lec[ioc_data.dev_num])
 696                 return -EINVAL;
 697         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 698         if (!vpriv)
 699                 return -ENOMEM;
 700         vpriv->xoff = 0;
 701         vpriv->old_pop = vcc->pop;
 702         vcc->user_back = vpriv;
 703         vcc->pop = lec_pop;
 704         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 705                       &ioc_data, vcc, vcc->push);
 706         vcc->proto_data = dev_lec[ioc_data.dev_num];
 707         vcc->push = lec_push;
 708         return 0;
 709 }
 710
 711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 712 {
 713         if (arg < 0 || arg >= MAX_LEC_ITF)
 714                 return -EINVAL;
 715         arg = array_index_nospec(arg, MAX_LEC_ITF);
 716         if (!dev_lec[arg])
 717                 return -EINVAL;
 718         vcc->proto_data = dev_lec[arg];
 719         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 720 }
 721
 722 /* Initialize device. */
 723 static int lecd_attach(struct atm_vcc *vcc, int arg)
 724 {
 725         int i;
 726         struct lec_priv *priv;
 727
 728         if (arg < 0)
 729                 i = 0;
 730         else
 731                 i = arg;
 732         if (arg >= MAX_LEC_ITF)
 733                 return -EINVAL;
 734         i = array_index_nospec(arg, MAX_LEC_ITF);
 735         if (!dev_lec[i]) {
 736                 int size;
 737
 738                 size = sizeof(struct lec_priv);
 739                 dev_lec[i] = alloc_etherdev(size);
 740                 if (!dev_lec[i])
 741                         return -ENOMEM;
 742                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 743                 dev_lec[i]->max_mtu = 18190;
 744                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 745                 if (register_netdev(dev_lec[i])) {
 746                         free_netdev(dev_lec[i]);
 747                         return -EINVAL;
 748                 }
 749
 750                 priv = netdev_priv(dev_lec[i]);
 751         } else {
 752                 priv = netdev_priv(dev_lec[i]);
 753                 if (priv->lecd)
 754                         return -EADDRINUSE;
 755         }
 756         lec_arp_init(priv);
 757         priv->itfnum = i;       /* LANE2 addition */
 758         priv->lecd = vcc;
 759         vcc->dev = &lecatm_dev;
 760         vcc_insert_socket(sk_atm(vcc));
 761
 762         vcc->proto_data = dev_lec[i];
 763         set_bit(ATM_VF_META, &vcc->flags);
 764         set_bit(ATM_VF_READY, &vcc->flags);
 765
 766         /* Set default values to these variables */
 767         priv->maximum_unknown_frame_count = 1;
 768         priv->max_unknown_frame_time = (1 * HZ);
 769         priv->vcc_timeout_period = (1200 * HZ);
 770         priv->max_retry_count = 1;
 771         priv->aging_time = (300 * HZ);
 772         priv->forward_delay_time = (15 * HZ);
 773         priv->topology_change = 0;
 774         priv->arp_response_time = (1 * HZ);
 775         priv->flush_timeout = (4 * HZ);
 776         priv->path_switching_delay = (6 * HZ);
 777
 778         if (dev_lec[i]->flags & IFF_UP)
 779                 netif_start_queue(dev_lec[i]);
 780         __module_get(THIS_MODULE);
 781         return i;
 782 }
 783
 784 #ifdef CONFIG_PROC_FS
 785 static const char *lec_arp_get_status_string(unsigned char status)
 786 {
 787         static const char *const lec_arp_status_string[] = {
 788                 "ESI_UNKNOWN       ",
 789                 "ESI_ARP_PENDING   ",
 790                 "ESI_VC_PENDING    ",
 791                 "<Undefined>       ",
 792                 "ESI_FLUSH_PENDING ",
 793                 "ESI_FORWARD_DIRECT"
 794         };
 795
 796         if (status > ESI_FORWARD_DIRECT)
 797                 status = 3;     /* ESI_UNDEFINED */
 798         return lec_arp_status_string[status];
 799 }
 800
 801 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 802 {
 803         int i;
 804
 805         for (i = 0; i < ETH_ALEN; i++)
 806                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 807         seq_printf(seq, " ");
 808         for (i = 0; i < ATM_ESA_LEN; i++)
 809                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 810         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 811                    entry->flags & 0xffff);
 812         if (entry->vcc)
 813                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 814         else
 815                 seq_printf(seq, "        ");
 816         if (entry->recv_vcc) {
 817                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 818                            entry->recv_vcc->vci);
 819         }
 820         seq_putc(seq, '\n');
 821 }
 822
 823 struct lec_state {
 824         unsigned long flags;
 825         struct lec_priv *locked;
 826         struct hlist_node *node;
 827         struct net_device *dev;
 828         int itf;
 829         int arp_table;
 830         int misc_table;
 831 };
 832
 833 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 834                           loff_t *l)
 835 {
 836         struct hlist_node *e = state->node;
 837
 838         if (!e)
 839                 e = tbl->first;
 840         if (e == SEQ_START_TOKEN) {
 841                 e = tbl->first;
 842                 --*l;
 843         }
 844
 845         for (; e; e = e->next) {
 846                 if (--*l < 0)
 847                         break;
 848         }
 849         state->node = e;
 850
 851         return (*l < 0) ? state : NULL;
 852 }
 853
 854 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 855                           struct lec_priv *priv)
 856 {
 857         void *v = NULL;
 858         int p;
 859
 860         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 861                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 862                 if (v)
 863                         break;
 864         }
 865         state->arp_table = p;
 866         return v;
 867 }
 868
 869 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 870                            struct lec_priv *priv)
 871 {
 872         struct hlist_head *lec_misc_tables[] = {
 873                 &priv->lec_arp_empty_ones,
 874                 &priv->lec_no_forward,
 875                 &priv->mcast_fwds
 876         };
 877         void *v = NULL;
 878         int q;
 879
 880         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 881                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 882                 if (v)
 883                         break;
 884         }
 885         state->misc_table = q;
 886         return v;
 887 }
 888
 889 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 890                            struct lec_priv *priv)
 891 {
 892         if (!state->locked) {
 893                 state->locked = priv;
 894                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 895         }
 896         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 897                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 898                 state->locked = NULL;
 899                 /* Partial state reset for the next time we get called */
 900                 state->arp_table = state->misc_table = 0;
 901         }
 902         return state->locked;
 903 }
 904
 905 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 906 {
 907         struct net_device *dev;
 908         void *v;
 909
 910         dev = state->dev ? state->dev : dev_lec[state->itf];
 911         v = (dev && netdev_priv(dev)) ?
 912                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 913         if (!v && dev) {
 914                 dev_put(dev);
 915                 /* Partial state reset for the next time we get called */
 916                 dev = NULL;
 917         }
 918         state->dev = dev;
 919         return v;
 920 }
 921
 922 static void *lec_get_idx(struct lec_state *state, loff_t l)
 923 {
 924         void *v = NULL;
 925
 926         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 927                 v = lec_itf_walk(state, &l);
 928                 if (v)
 929                         break;
 930         }
 931         return v;
 932 }
 933
 934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 935 {
 936         struct lec_state *state = seq->private;
 937
 938         state->itf = 0;
 939         state->dev = NULL;
 940         state->locked = NULL;
 941         state->arp_table = 0;
 942         state->misc_table = 0;
 943         state->node = SEQ_START_TOKEN;
 944
 945         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 946 }
 947
 948 static void lec_seq_stop(struct seq_file *seq, void *v)
 949 {
 950         struct lec_state *state = seq->private;
 951
 952         if (state->dev) {
 953                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 954                                        state->flags);
 955                 dev_put(state->dev);
 956         }
 957 }
 958
 959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 960 {
 961         struct lec_state *state = seq->private;
 962
 963         v = lec_get_idx(state, 1);
 964         *pos += !!PTR_ERR(v);
 965         return v;
 966 }
 967
 968 static int lec_seq_show(struct seq_file *seq, void *v)
 969 {
 970         static const char lec_banner[] =
 971             "Itf  MAC          ATM destination"
 972             "                          Status            Flags "
 973             "VPI/VCI Recv VPI/VCI\n";
 974
 975         if (v == SEQ_START_TOKEN)
 976                 seq_puts(seq, lec_banner);
 977         else {
 978                 struct lec_state *state = seq->private;
 979                 struct net_device *dev = state->dev;
 980                 struct lec_arp_table *entry = hlist_entry(state->node,
 981                                                           struct lec_arp_table,
 982                                                           next);
 983
 984                 seq_printf(seq, "%s ", dev->name);
 985                 lec_info(seq, entry);
 986         }
 987         return 0;
 988 }
 989
 990 static const struct seq_operations lec_seq_ops = {
 991         .start = lec_seq_start,
 992         .next = lec_seq_next,
 993         .stop = lec_seq_stop,
 994         .show = lec_seq_show,
 995 };
 996
 997 static int lec_seq_open(struct inode *inode, struct file *file)
 998 {
 999         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1000 }
1001
1002 static const struct file_operations lec_seq_fops = {
1003         .owner = THIS_MODULE,
1004         .open = lec_seq_open,
1005         .read = seq_read,
1006         .llseek = seq_lseek,
1007         .release = seq_release_private,
1008 };
1009 #endif
1010
1011 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1012 {
1013         struct atm_vcc *vcc = ATM_SD(sock);
1014         int err = 0;
1015
1016         switch (cmd) {
1017         case ATMLEC_CTRL:
1018         case ATMLEC_MCAST:
1019         case ATMLEC_DATA:
1020                 if (!capable(CAP_NET_ADMIN))
1021                         return -EPERM;
1022                 break;
1023         default:
1024                 return -ENOIOCTLCMD;
1025         }
1026
1027         switch (cmd) {
1028         case ATMLEC_CTRL:
1029                 err = lecd_attach(vcc, (int)arg);
1030                 if (err >= 0)
1031                         sock->state = SS_CONNECTED;
1032                 break;
1033         case ATMLEC_MCAST:
1034                 err = lec_mcast_attach(vcc, (int)arg);
1035                 break;
1036         case ATMLEC_DATA:
1037                 err = lec_vcc_attach(vcc, (void __user *)arg);
1038                 break;
1039         }
1040
1041         return err;
1042 }
1043
1044 static struct atm_ioctl lane_ioctl_ops = {
1045         .owner = THIS_MODULE,
1046         .ioctl = lane_ioctl,
1047 };
1048
1049 static int __init lane_module_init(void)
1050 {
1051 #ifdef CONFIG_PROC_FS
1052         struct proc_dir_entry *p;
1053
1054         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1055         if (!p) {
1056                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1057                 return -ENOMEM;
1058         }
1059 #endif
1060
1061         register_atm_ioctl(&lane_ioctl_ops);
1062         pr_info("lec.c: initialized\n");
1063         return 0;
1064 }
1065
1066 static void __exit lane_module_cleanup(void)
1067 {
1068         int i;
1069
1070 #ifdef CONFIG_PROC_FS
1071         remove_proc_entry("lec", atm_proc_root);
1072 #endif
1073
1074         deregister_atm_ioctl(&lane_ioctl_ops);
1075
1076         for (i = 0; i < MAX_LEC_ITF; i++) {
1077                 if (dev_lec[i] != NULL) {
1078                         unregister_netdev(dev_lec[i]);
1079                         free_netdev(dev_lec[i]);
1080                         dev_lec[i] = NULL;
1081                 }
1082         }
1083 }
1084
1085 module_init(lane_module_init);
1086 module_exit(lane_module_cleanup);
1087
1088 /*
1089  * LANE2: 3.1.3, LE_RESOLVE.request
1090  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1091  * If sizeoftlvs == NULL the default TLVs associated with with this
1092  * lec will be used.
1093  * If dst_mac == NULL, targetless LE_ARP will be sent
1094  */
1095 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1096                          u8 **tlvs, u32 *sizeoftlvs)
1097 {
1098         unsigned long flags;
1099         struct lec_priv *priv = netdev_priv(dev);
1100         struct lec_arp_table *table;
1101         struct sk_buff *skb;
1102         int retval;
1103
1104         if (force == 0) {
1105                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1106                 table = lec_arp_find(priv, dst_mac);
1107                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1108                 if (table == NULL)
1109                         return -1;
1110
1111                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1112                 if (*tlvs == NULL)
1113                         return -1;
1114
1115                 *sizeoftlvs = table->sizeoftlvs;
1116
1117                 return 0;
1118         }
1119
1120         if (sizeoftlvs == NULL)
1121                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1122
1123         else {
1124                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1125                 if (skb == NULL)
1126                         return -1;
1127                 skb->len = *sizeoftlvs;
1128                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1129                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1130         }
1131         return retval;
1132 }
1133
1134 /*
1135  * LANE2: 3.1.4, LE_ASSOCIATE.request
1136  * Associate the *tlvs with the *lan_dst address.
1137  * Will overwrite any previous association
1138  * Returns 1 for success, 0 for failure (out of memory)
1139  *
1140  */
1141 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1142                                const u8 *tlvs, u32 sizeoftlvs)
1143 {
1144         int retval;
1145         struct sk_buff *skb;
1146         struct lec_priv *priv = netdev_priv(dev);
1147
1148         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1149                 return 0;       /* not our mac address */
1150
1151         kfree(priv->tlvs);      /* NULL if there was no previous association */
1152
1153         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1154         if (priv->tlvs == NULL)
1155                 return 0;
1156         priv->sizeoftlvs = sizeoftlvs;
1157
1158         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1159         if (skb == NULL)
1160                 return 0;
1161         skb->len = sizeoftlvs;
1162         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1163         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1164         if (retval != 0)
1165                 pr_info("lec.c: lane2_associate_req() failed\n");
1166         /*
1167          * If the previous association has changed we must
1168          * somehow notify other LANE entities about the change
1169          */
1170         return 1;
1171 }
1172
1173 /*
1174  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1175  *
1176  */
1177 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1178                                 const u8 *tlvs, u32 sizeoftlvs)
1179 {
1180 #if 0
1181         int i = 0;
1182 #endif
1183         struct lec_priv *priv = netdev_priv(dev);
1184 #if 0                           /*
1185                                  * Why have the TLVs in LE_ARP entries
1186                                  * since we do not use them? When you
1187                                  * uncomment this code, make sure the
1188                                  * TLVs get freed when entry is killed
1189                                  */
1190         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1191
1192         if (entry == NULL)
1193                 return;         /* should not happen */
1194
1195         kfree(entry->tlvs);
1196
1197         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1198         if (entry->tlvs == NULL)
1199                 return;
1200         entry->sizeoftlvs = sizeoftlvs;
1201 #endif
1202 #if 0
1203         pr_info("\n");
1204         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1205         while (i < sizeoftlvs)
1206                 pr_cont("%02x ", tlvs[i++]);
1207
1208         pr_cont("\n");
1209 #endif
1210
1211         /* tell MPOA about the TLVs we saw */
1212         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1213                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1214                                                      tlvs, sizeoftlvs);
1215         }
1216 }
1217
1218 /*
1219  * Here starts what used to lec_arpc.c
1220  *
1221  * lec_arpc.c was added here when making
1222  * lane client modular. October 1997
1223  */
1224
1225 #include <linux/types.h>
1226 #include <linux/timer.h>
1227 #include <linux/param.h>
1228 #include <linux/atomic.h>
1229 #include <linux/inetdevice.h>
1230 #include <net/route.h>
1231
1232 #if 0
1233 #define pr_debug(format, args...)
1234 /*
1235   #define pr_debug printk
1236 */
1237 #endif
1238 #define DEBUG_ARP_TABLE 0
1239
1240 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1241
1242 static void lec_arp_check_expire(struct work_struct *work);
1243 static void lec_arp_expire_arp(unsigned long data);
1244
1245 /*
1246  * Arp table funcs
1247  */
1248
1249 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1250
1251 /*
1252  * Initialization of arp-cache
1253  */
1254 static void lec_arp_init(struct lec_priv *priv)
1255 {
1256         unsigned short i;
1257
1258         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1259                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1260         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1261         INIT_HLIST_HEAD(&priv->lec_no_forward);
1262         INIT_HLIST_HEAD(&priv->mcast_fwds);
1263         spin_lock_init(&priv->lec_arp_lock);
1264         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1265         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1266 }
1267
1268 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1269 {
1270         if (entry->vcc) {
1271                 struct atm_vcc *vcc = entry->vcc;
1272                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1273                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1274
1275                 vcc->pop = vpriv->old_pop;
1276                 if (vpriv->xoff)
1277                         netif_wake_queue(dev);
1278                 kfree(vpriv);
1279                 vcc->user_back = NULL;
1280                 vcc->push = entry->old_push;
1281                 vcc_release_async(vcc, -EPIPE);
1282                 entry->vcc = NULL;
1283         }
1284         if (entry->recv_vcc) {
1285                 struct atm_vcc *vcc = entry->recv_vcc;
1286                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1287
1288                 kfree(vpriv);
1289                 vcc->user_back = NULL;
1290
1291                 entry->recv_vcc->push = entry->old_recv_push;
1292                 vcc_release_async(entry->recv_vcc, -EPIPE);
1293                 entry->recv_vcc = NULL;
1294         }
1295 }
1296
1297 /*
1298  * Insert entry to lec_arp_table
1299  * LANE2: Add to the end of the list to satisfy 8.1.13
1300  */
1301 static inline void
1302 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1303 {
1304         struct hlist_head *tmp;
1305
1306         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1307         hlist_add_head(&entry->next, tmp);
1308
1309         pr_debug("Added entry:%pM\n", entry->mac_addr);
1310 }
1311
1312 /*
1313  * Remove entry from lec_arp_table
1314  */
1315 static int
1316 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1317 {
1318         struct lec_arp_table *entry;
1319         int i, remove_vcc = 1;
1320
1321         if (!to_remove)
1322                 return -1;
1323
1324         hlist_del(&to_remove->next);
1325         del_timer(&to_remove->timer);
1326
1327         /*
1328          * If this is the only MAC connected to this VCC,
1329          * also tear down the VCC
1330          */
1331         if (to_remove->status >= ESI_FLUSH_PENDING) {
1332                 /*
1333                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1334                  */
1335                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1336                         hlist_for_each_entry(entry,
1337                                              &priv->lec_arp_tables[i], next) {
1338                                 if (memcmp(to_remove->atm_addr,
1339                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1340                                         remove_vcc = 0;
1341                                         break;
1342                                 }
1343                         }
1344                 }
1345                 if (remove_vcc)
1346                         lec_arp_clear_vccs(to_remove);
1347         }
1348         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1349
1350         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1351         return 0;
1352 }
1353
1354 #if DEBUG_ARP_TABLE
1355 static const char *get_status_string(unsigned char st)
1356 {
1357         switch (st) {
1358         case ESI_UNKNOWN:
1359                 return "ESI_UNKNOWN";
1360         case ESI_ARP_PENDING:
1361                 return "ESI_ARP_PENDING";
1362         case ESI_VC_PENDING:
1363                 return "ESI_VC_PENDING";
1364         case ESI_FLUSH_PENDING:
1365                 return "ESI_FLUSH_PENDING";
1366         case ESI_FORWARD_DIRECT:
1367                 return "ESI_FORWARD_DIRECT";
1368         }
1369         return "<UNKNOWN>";
1370 }
1371
1372 static void dump_arp_table(struct lec_priv *priv)
1373 {
1374         struct lec_arp_table *rulla;
1375         char buf[256];
1376         int i, j, offset;
1377
1378         pr_info("Dump %p:\n", priv);
1379         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1380                 hlist_for_each_entry(rulla,
1381                                      &priv->lec_arp_tables[i], next) {
1382                         offset = 0;
1383                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1384                         offset += sprintf(buf + offset, "Mac: %pM",
1385                                           rulla->mac_addr);
1386                         offset += sprintf(buf + offset, " Atm:");
1387                         for (j = 0; j < ATM_ESA_LEN; j++) {
1388                                 offset += sprintf(buf + offset,
1389                                                   "%2.2x ",
1390                                                   rulla->atm_addr[j] & 0xff);
1391                         }
1392                         offset += sprintf(buf + offset,
1393                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1394                                           rulla->vcc ? rulla->vcc->vpi : 0,
1395                                           rulla->vcc ? rulla->vcc->vci : 0,
1396                                           rulla->recv_vcc ? rulla->recv_vcc->
1397                                           vpi : 0,
1398                                           rulla->recv_vcc ? rulla->recv_vcc->
1399                                           vci : 0, rulla->last_used,
1400                                           rulla->timestamp, rulla->no_tries);
1401                         offset +=
1402                             sprintf(buf + offset,
1403                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1404                                     rulla->flags, rulla->packets_flooded,
1405                                     get_status_string(rulla->status));
1406                         pr_info("%s\n", buf);
1407                 }
1408         }
1409
1410         if (!hlist_empty(&priv->lec_no_forward))
1411                 pr_info("No forward\n");
1412         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1413                 offset = 0;
1414                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1415                 offset += sprintf(buf + offset, " Atm:");
1416                 for (j = 0; j < ATM_ESA_LEN; j++) {
1417                         offset += sprintf(buf + offset, "%2.2x ",
1418                                           rulla->atm_addr[j] & 0xff);
1419                 }
1420                 offset += sprintf(buf + offset,
1421                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1422                                   rulla->vcc ? rulla->vcc->vpi : 0,
1423                                   rulla->vcc ? rulla->vcc->vci : 0,
1424                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1425                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1426                                   rulla->last_used,
1427                                   rulla->timestamp, rulla->no_tries);
1428                 offset += sprintf(buf + offset,
1429                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1430                                   rulla->flags, rulla->packets_flooded,
1431                                   get_status_string(rulla->status));
1432                 pr_info("%s\n", buf);
1433         }
1434
1435         if (!hlist_empty(&priv->lec_arp_empty_ones))
1436                 pr_info("Empty ones\n");
1437         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1438                 offset = 0;
1439                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1440                 offset += sprintf(buf + offset, " Atm:");
1441                 for (j = 0; j < ATM_ESA_LEN; j++) {
1442                         offset += sprintf(buf + offset, "%2.2x ",
1443                                           rulla->atm_addr[j] & 0xff);
1444                 }
1445                 offset += sprintf(buf + offset,
1446                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1447                                   rulla->vcc ? rulla->vcc->vpi : 0,
1448                                   rulla->vcc ? rulla->vcc->vci : 0,
1449                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1450                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1451                                   rulla->last_used,
1452                                   rulla->timestamp, rulla->no_tries);
1453                 offset += sprintf(buf + offset,
1454                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1455                                   rulla->flags, rulla->packets_flooded,
1456                                   get_status_string(rulla->status));
1457                 pr_info("%s", buf);
1458         }
1459
1460         if (!hlist_empty(&priv->mcast_fwds))
1461                 pr_info("Multicast Forward VCCs\n");
1462         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1463                 offset = 0;
1464                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1465                 offset += sprintf(buf + offset, " Atm:");
1466                 for (j = 0; j < ATM_ESA_LEN; j++) {
1467                         offset += sprintf(buf + offset, "%2.2x ",
1468                                           rulla->atm_addr[j] & 0xff);
1469                 }
1470                 offset += sprintf(buf + offset,
1471                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1472                                   rulla->vcc ? rulla->vcc->vpi : 0,
1473                                   rulla->vcc ? rulla->vcc->vci : 0,
1474                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1475                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1476                                   rulla->last_used,
1477                                   rulla->timestamp, rulla->no_tries);
1478                 offset += sprintf(buf + offset,
1479                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1480                                   rulla->flags, rulla->packets_flooded,
1481                                   get_status_string(rulla->status));
1482                 pr_info("%s\n", buf);
1483         }
1484
1485 }
1486 #else
1487 #define dump_arp_table(priv) do { } while (0)
1488 #endif
1489
1490 /*
1491  * Destruction of arp-cache
1492  */
1493 static void lec_arp_destroy(struct lec_priv *priv)
1494 {
1495         unsigned long flags;
1496         struct hlist_node *next;
1497         struct lec_arp_table *entry;
1498         int i;
1499
1500         cancel_delayed_work_sync(&priv->lec_arp_work);
1501
1502         /*
1503          * Remove all entries
1504          */
1505
1506         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1507         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1508                 hlist_for_each_entry_safe(entry, next,
1509                                           &priv->lec_arp_tables[i], next) {
1510                         lec_arp_remove(priv, entry);
1511                         lec_arp_put(entry);
1512                 }
1513                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1514         }
1515
1516         hlist_for_each_entry_safe(entry, next,
1517                                   &priv->lec_arp_empty_ones, next) {
1518                 del_timer_sync(&entry->timer);
1519                 lec_arp_clear_vccs(entry);
1520                 hlist_del(&entry->next);
1521                 lec_arp_put(entry);
1522         }
1523         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1524
1525         hlist_for_each_entry_safe(entry, next,
1526                                   &priv->lec_no_forward, next) {
1527                 del_timer_sync(&entry->timer);
1528                 lec_arp_clear_vccs(entry);
1529                 hlist_del(&entry->next);
1530                 lec_arp_put(entry);
1531         }
1532         INIT_HLIST_HEAD(&priv->lec_no_forward);
1533
1534         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1535                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1536                 lec_arp_clear_vccs(entry);
1537                 hlist_del(&entry->next);
1538                 lec_arp_put(entry);
1539         }
1540         INIT_HLIST_HEAD(&priv->mcast_fwds);
1541         priv->mcast_vcc = NULL;
1542         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1543 }
1544
1545 /*
1546  * Find entry by mac_address
1547  */
1548 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1549                                           const unsigned char *mac_addr)
1550 {
1551         struct hlist_head *head;
1552         struct lec_arp_table *entry;
1553
1554         pr_debug("%pM\n", mac_addr);
1555
1556         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1557         hlist_for_each_entry(entry, head, next) {
1558                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1559                         return entry;
1560         }
1561         return NULL;
1562 }
1563
1564 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1565                                         const unsigned char *mac_addr)
1566 {
1567         struct lec_arp_table *to_return;
1568
1569         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1570         if (!to_return) {
1571                 pr_info("LEC: Arp entry kmalloc failed\n");
1572                 return NULL;
1573         }
1574         ether_addr_copy(to_return->mac_addr, mac_addr);
1575         INIT_HLIST_NODE(&to_return->next);
1576         setup_timer(&to_return->timer, lec_arp_expire_arp,
1577                         (unsigned long)to_return);
1578         to_return->last_used = jiffies;
1579         to_return->priv = priv;
1580         skb_queue_head_init(&to_return->tx_wait);
1581         refcount_set(&to_return->usage, 1);
1582         return to_return;
1583 }
1584
1585 /* Arp sent timer expired */
1586 static void lec_arp_expire_arp(unsigned long data)
1587 {
1588         struct lec_arp_table *entry;
1589
1590         entry = (struct lec_arp_table *)data;
1591
1592         pr_debug("\n");
1593         if (entry->status == ESI_ARP_PENDING) {
1594                 if (entry->no_tries <= entry->priv->max_retry_count) {
1595                         if (entry->is_rdesc)
1596                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1597                                              entry->mac_addr, NULL, NULL);
1598                         else
1599                                 send_to_lecd(entry->priv, l_arp_xmt,
1600                                              entry->mac_addr, NULL, NULL);
1601                         entry->no_tries++;
1602                 }
1603                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1604         }
1605 }
1606
1607 /* Unknown/unused vcc expire, remove associated entry */
1608 static void lec_arp_expire_vcc(unsigned long data)
1609 {
1610         unsigned long flags;
1611         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1612         struct lec_priv *priv = to_remove->priv;
1613
1614         del_timer(&to_remove->timer);
1615
1616         pr_debug("%p %p: vpi:%d vci:%d\n",
1617                  to_remove, priv,
1618                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1619                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1620
1621         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1622         hlist_del(&to_remove->next);
1623         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1624
1625         lec_arp_clear_vccs(to_remove);
1626         lec_arp_put(to_remove);
1627 }
1628
1629 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1630                                    unsigned long now,
1631                                    struct lec_priv *priv)
1632 {
1633         unsigned long time_to_check;
1634
1635         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1636                 time_to_check = priv->forward_delay_time;
1637         else
1638                 time_to_check = priv->aging_time;
1639
1640         pr_debug("About to expire: %lx - %lx > %lx\n",
1641                  now, entry->last_used, time_to_check);
1642         if (time_after(now, entry->last_used + time_to_check) &&
1643             !(entry->flags & LEC_PERMANENT_FLAG) &&
1644             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1645                 /* Remove entry */
1646                 pr_debug("Entry timed out\n");
1647                 lec_arp_remove(priv, entry);
1648                 lec_arp_put(entry);
1649         } else {
1650                 /* Something else */
1651                 if ((entry->status == ESI_VC_PENDING ||
1652                      entry->status == ESI_ARP_PENDING) &&
1653                     time_after_eq(now, entry->timestamp +
1654                                        priv->max_unknown_frame_time)) {
1655                         entry->timestamp = jiffies;
1656                         entry->packets_flooded = 0;
1657                         if (entry->status == ESI_VC_PENDING)
1658                                 send_to_lecd(priv, l_svc_setup,
1659                                              entry->mac_addr,
1660                                              entry->atm_addr,
1661                                              NULL);
1662                 }
1663                 if (entry->status == ESI_FLUSH_PENDING &&
1664                     time_after_eq(now, entry->timestamp +
1665                                        priv->path_switching_delay)) {
1666                         lec_arp_hold(entry);
1667                         return true;
1668                 }
1669         }
1670
1671         return false;
1672 }
1673 /*
1674  * Expire entries.
1675  * 1. Re-set timer
1676  * 2. For each entry, delete entries that have aged past the age limit.
1677  * 3. For each entry, depending on the status of the entry, perform
1678  *    the following maintenance.
1679  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1680  *       tick_count is above the max_unknown_frame_time, clear
1681  *       the tick_count to zero and clear the packets_flooded counter
1682  *       to zero. This supports the packet rate limit per address
1683  *       while flooding unknowns.
1684  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1685  *       than or equal to the path_switching_delay, change the status
1686  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1687  *       regardless of the progress of the flush protocol.
1688  */
1689 static void lec_arp_check_expire(struct work_struct *work)
1690 {
1691         unsigned long flags;
1692         struct lec_priv *priv =
1693                 container_of(work, struct lec_priv, lec_arp_work.work);
1694         struct hlist_node *next;
1695         struct lec_arp_table *entry;
1696         unsigned long now;
1697         int i;
1698
1699         pr_debug("%p\n", priv);
1700         now = jiffies;
1701 restart:
1702         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1703         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1704                 hlist_for_each_entry_safe(entry, next,
1705                                           &priv->lec_arp_tables[i], next) {
1706                         if (__lec_arp_check_expire(entry, now, priv)) {
1707                                 struct sk_buff *skb;
1708                                 struct atm_vcc *vcc = entry->vcc;
1709
1710                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1711                                                        flags);
1712                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1713                                         lec_send(vcc, skb);
1714                                 entry->last_used = jiffies;
1715                                 entry->status = ESI_FORWARD_DIRECT;
1716                                 lec_arp_put(entry);
1717
1718                                 goto restart;
1719                         }
1720                 }
1721         }
1722         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1723
1724         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1725 }
1726
1727 /*
1728  * Try to find vcc where mac_address is attached.
1729  *
1730  */
1731 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1732                                        const unsigned char *mac_to_find,
1733                                        int is_rdesc,
1734                                        struct lec_arp_table **ret_entry)
1735 {
1736         unsigned long flags;
1737         struct lec_arp_table *entry;
1738         struct atm_vcc *found;
1739
1740         if (mac_to_find[0] & 0x01) {
1741                 switch (priv->lane_version) {
1742                 case 1:
1743                         return priv->mcast_vcc;
1744                 case 2: /* LANE2 wants arp for multicast addresses */
1745                         if (ether_addr_equal(mac_to_find, bus_mac))
1746                                 return priv->mcast_vcc;
1747                         break;
1748                 default:
1749                         break;
1750                 }
1751         }
1752
1753         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1754         entry = lec_arp_find(priv, mac_to_find);
1755
1756         if (entry) {
1757                 if (entry->status == ESI_FORWARD_DIRECT) {
1758                         /* Connection Ok */
1759                         entry->last_used = jiffies;
1760                         lec_arp_hold(entry);
1761                         *ret_entry = entry;
1762                         found = entry->vcc;
1763                         goto out;
1764                 }
1765                 /*
1766                  * If the LE_ARP cache entry is still pending, reset count to 0
1767                  * so another LE_ARP request can be made for this frame.
1768                  */
1769                 if (entry->status == ESI_ARP_PENDING)
1770                         entry->no_tries = 0;
1771                 /*
1772                  * Data direct VC not yet set up, check to see if the unknown
1773                  * frame count is greater than the limit. If the limit has
1774                  * not been reached, allow the caller to send packet to
1775                  * BUS.
1776                  */
1777                 if (entry->status != ESI_FLUSH_PENDING &&
1778                     entry->packets_flooded <
1779                     priv->maximum_unknown_frame_count) {
1780                         entry->packets_flooded++;
1781                         pr_debug("Flooding..\n");
1782                         found = priv->mcast_vcc;
1783                         goto out;
1784                 }
1785                 /*
1786                  * We got here because entry->status == ESI_FLUSH_PENDING
1787                  * or BUS flood limit was reached for an entry which is
1788                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1789                  */
1790                 lec_arp_hold(entry);
1791                 *ret_entry = entry;
1792                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1793                          entry->vcc);
1794                 found = NULL;
1795         } else {
1796                 /* No matching entry was found */
1797                 entry = make_entry(priv, mac_to_find);
1798                 pr_debug("Making entry\n");
1799                 if (!entry) {
1800                         found = priv->mcast_vcc;
1801                         goto out;
1802                 }
1803                 lec_arp_add(priv, entry);
1804                 /* We want arp-request(s) to be sent */
1805                 entry->packets_flooded = 1;
1806                 entry->status = ESI_ARP_PENDING;
1807                 entry->no_tries = 1;
1808                 entry->last_used = entry->timestamp = jiffies;
1809                 entry->is_rdesc = is_rdesc;
1810                 if (entry->is_rdesc)
1811                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1812                                      NULL);
1813                 else
1814                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1815                 entry->timer.expires = jiffies + (1 * HZ);
1816                 entry->timer.function = lec_arp_expire_arp;
1817                 add_timer(&entry->timer);
1818                 found = priv->mcast_vcc;
1819         }
1820
1821 out:
1822         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1823         return found;
1824 }
1825
1826 static int
1827 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1828                 unsigned long permanent)
1829 {
1830         unsigned long flags;
1831         struct hlist_node *next;
1832         struct lec_arp_table *entry;
1833         int i;
1834
1835         pr_debug("\n");
1836         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1837         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1838                 hlist_for_each_entry_safe(entry, next,
1839                                           &priv->lec_arp_tables[i], next) {
1840                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1841                             (permanent ||
1842                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1843                                 lec_arp_remove(priv, entry);
1844                                 lec_arp_put(entry);
1845                         }
1846                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1847                         return 0;
1848                 }
1849         }
1850         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1851         return -1;
1852 }
1853
1854 /*
1855  * Notifies:  Response to arp_request (atm_addr != NULL)
1856  */
1857 static void
1858 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1859                const unsigned char *atm_addr, unsigned long remoteflag,
1860                unsigned int targetless_le_arp)
1861 {
1862         unsigned long flags;
1863         struct hlist_node *next;
1864         struct lec_arp_table *entry, *tmp;
1865         int i;
1866
1867         pr_debug("%smac:%pM\n",
1868                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1869
1870         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1871         entry = lec_arp_find(priv, mac_addr);
1872         if (entry == NULL && targetless_le_arp)
1873                 goto out;       /*
1874                                  * LANE2: ignore targetless LE_ARPs for which
1875                                  * we have no entry in the cache. 7.1.30
1876                                  */
1877         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1878                 hlist_for_each_entry_safe(entry, next,
1879                                           &priv->lec_arp_empty_ones, next) {
1880                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1881                                 hlist_del(&entry->next);
1882                                 del_timer(&entry->timer);
1883                                 tmp = lec_arp_find(priv, mac_addr);
1884                                 if (tmp) {
1885                                         del_timer(&tmp->timer);
1886                                         tmp->status = ESI_FORWARD_DIRECT;
1887                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1888                                         tmp->vcc = entry->vcc;
1889                                         tmp->old_push = entry->old_push;
1890                                         tmp->last_used = jiffies;
1891                                         del_timer(&entry->timer);
1892                                         lec_arp_put(entry);
1893                                         entry = tmp;
1894                                 } else {
1895                                         entry->status = ESI_FORWARD_DIRECT;
1896                                         ether_addr_copy(entry->mac_addr,
1897                                                         mac_addr);
1898                                         entry->last_used = jiffies;
1899                                         lec_arp_add(priv, entry);
1900                                 }
1901                                 if (remoteflag)
1902                                         entry->flags |= LEC_REMOTE_FLAG;
1903                                 else
1904                                         entry->flags &= ~LEC_REMOTE_FLAG;
1905                                 pr_debug("After update\n");
1906                                 dump_arp_table(priv);
1907                                 goto out;
1908                         }
1909                 }
1910         }
1911
1912         entry = lec_arp_find(priv, mac_addr);
1913         if (!entry) {
1914                 entry = make_entry(priv, mac_addr);
1915                 if (!entry)
1916                         goto out;
1917                 entry->status = ESI_UNKNOWN;
1918                 lec_arp_add(priv, entry);
1919                 /* Temporary, changes before end of function */
1920         }
1921         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1922         del_timer(&entry->timer);
1923         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1924                 hlist_for_each_entry(tmp,
1925                                      &priv->lec_arp_tables[i], next) {
1926                         if (entry != tmp &&
1927                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1928                                 /* Vcc to this host exists */
1929                                 if (tmp->status > ESI_VC_PENDING) {
1930                                         /*
1931                                          * ESI_FLUSH_PENDING,
1932                                          * ESI_FORWARD_DIRECT
1933                                          */
1934                                         entry->vcc = tmp->vcc;
1935                                         entry->old_push = tmp->old_push;
1936                                 }
1937                                 entry->status = tmp->status;
1938                                 break;
1939                         }
1940                 }
1941         }
1942         if (remoteflag)
1943                 entry->flags |= LEC_REMOTE_FLAG;
1944         else
1945                 entry->flags &= ~LEC_REMOTE_FLAG;
1946         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1947                 entry->status = ESI_VC_PENDING;
1948                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1949         }
1950         pr_debug("After update2\n");
1951         dump_arp_table(priv);
1952 out:
1953         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1954 }
1955
1956 /*
1957  * Notifies: Vcc setup ready
1958  */
1959 static void
1960 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1961               struct atm_vcc *vcc,
1962               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1963 {
1964         unsigned long flags;
1965         struct lec_arp_table *entry;
1966         int i, found_entry = 0;
1967
1968         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1969         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1970         if (ioc_data->receive == 2) {
1971                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1972 #if 0
1973                 entry = lec_arp_find(priv, bus_mac);
1974                 if (!entry) {
1975                         pr_info("LEC_ARP: Multicast entry not found!\n");
1976                         goto out;
1977                 }
1978                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1979                 entry->recv_vcc = vcc;
1980                 entry->old_recv_push = old_push;
1981 #endif
1982                 entry = make_entry(priv, bus_mac);
1983                 if (entry == NULL)
1984                         goto out;
1985                 del_timer(&entry->timer);
1986                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1987                 entry->recv_vcc = vcc;
1988                 entry->old_recv_push = old_push;
1989                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1990                 goto out;
1991         } else if (ioc_data->receive == 1) {
1992                 /*
1993                  * Vcc which we don't want to make default vcc,
1994                  * attach it anyway.
1995                  */
1996                 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1997                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1998                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1999                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2000                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2001                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2002                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2003                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2004                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2005                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2006                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2007                 entry = make_entry(priv, bus_mac);
2008                 if (entry == NULL)
2009                         goto out;
2010                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2011                 eth_zero_addr(entry->mac_addr);
2012                 entry->recv_vcc = vcc;
2013                 entry->old_recv_push = old_push;
2014                 entry->status = ESI_UNKNOWN;
2015                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2016                 entry->timer.function = lec_arp_expire_vcc;
2017                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2018                 add_timer(&entry->timer);
2019                 dump_arp_table(priv);
2020                 goto out;
2021         }
2022         pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2023                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2024                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2025                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2026                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2027                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2028                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2029                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2030                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2031                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2032                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2033         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2034                 hlist_for_each_entry(entry,
2035                                      &priv->lec_arp_tables[i], next) {
2036                         if (memcmp
2037                             (ioc_data->atm_addr, entry->atm_addr,
2038                              ATM_ESA_LEN) == 0) {
2039                                 pr_debug("LEC_ARP: Attaching data direct\n");
2040                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2041                                          entry->vcc ? entry->vcc->vci : 0,
2042                                          entry->recv_vcc ? entry->recv_vcc->
2043                                          vci : 0);
2044                                 found_entry = 1;
2045                                 del_timer(&entry->timer);
2046                                 entry->vcc = vcc;
2047                                 entry->old_push = old_push;
2048                                 if (entry->status == ESI_VC_PENDING) {
2049                                         if (priv->maximum_unknown_frame_count
2050                                             == 0)
2051                                                 entry->status =
2052                                                     ESI_FORWARD_DIRECT;
2053                                         else {
2054                                                 entry->timestamp = jiffies;
2055                                                 entry->status =
2056                                                     ESI_FLUSH_PENDING;
2057 #if 0
2058                                                 send_to_lecd(priv, l_flush_xmt,
2059                                                              NULL,
2060                                                              entry->atm_addr,
2061                                                              NULL);
2062 #endif
2063                                         }
2064                                 } else {
2065                                         /*
2066                                          * They were forming a connection
2067                                          * to us, and we to them. Our
2068                                          * ATM address is numerically lower
2069                                          * than theirs, so we make connection
2070                                          * we formed into default VCC (8.1.11).
2071                                          * Connection they made gets torn
2072                                          * down. This might confuse some
2073                                          * clients. Can be changed if
2074                                          * someone reports trouble...
2075                                          */
2076                                         ;
2077                                 }
2078                         }
2079                 }
2080         }
2081         if (found_entry) {
2082                 pr_debug("After vcc was added\n");
2083                 dump_arp_table(priv);
2084                 goto out;
2085         }
2086         /*
2087          * Not found, snatch address from first data packet that arrives
2088          * from this vcc
2089          */
2090         entry = make_entry(priv, bus_mac);
2091         if (!entry)
2092                 goto out;
2093         entry->vcc = vcc;
2094         entry->old_push = old_push;
2095         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2096         eth_zero_addr(entry->mac_addr);
2097         entry->status = ESI_UNKNOWN;
2098         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2099         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2100         entry->timer.function = lec_arp_expire_vcc;
2101         add_timer(&entry->timer);
2102         pr_debug("After vcc was added\n");
2103         dump_arp_table(priv);
2104 out:
2105         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2106 }
2107
2108 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2109 {
2110         unsigned long flags;
2111         struct lec_arp_table *entry;
2112         int i;
2113
2114         pr_debug("%lx\n", tran_id);
2115 restart:
2116         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2117         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2118                 hlist_for_each_entry(entry,
2119                                      &priv->lec_arp_tables[i], next) {
2120                         if (entry->flush_tran_id == tran_id &&
2121                             entry->status == ESI_FLUSH_PENDING) {
2122                                 struct sk_buff *skb;
2123                                 struct atm_vcc *vcc = entry->vcc;
2124
2125                                 lec_arp_hold(entry);
2126                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2127                                                        flags);
2128                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2129                                         lec_send(vcc, skb);
2130                                 entry->last_used = jiffies;
2131                                 entry->status = ESI_FORWARD_DIRECT;
2132                                 lec_arp_put(entry);
2133                                 pr_debug("LEC_ARP: Flushed\n");
2134                                 goto restart;
2135                         }
2136                 }
2137         }
2138         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2139         dump_arp_table(priv);
2140 }
2141
2142 static void
2143 lec_set_flush_tran_id(struct lec_priv *priv,
2144                       const unsigned char *atm_addr, unsigned long tran_id)
2145 {
2146         unsigned long flags;
2147         struct lec_arp_table *entry;
2148         int i;
2149
2150         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2151         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2152                 hlist_for_each_entry(entry,
2153                                      &priv->lec_arp_tables[i], next) {
2154                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2155                                 entry->flush_tran_id = tran_id;
2156                                 pr_debug("Set flush transaction id to %lx for %p\n",
2157                                          tran_id, entry);
2158                         }
2159                 }
2160         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2161 }
2162
2163 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2164 {
2165         unsigned long flags;
2166         unsigned char mac_addr[] = {
2167                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2168         };
2169         struct lec_arp_table *to_add;
2170         struct lec_vcc_priv *vpriv;
2171         int err = 0;
2172
2173         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2174         if (!vpriv)
2175                 return -ENOMEM;
2176         vpriv->xoff = 0;
2177         vpriv->old_pop = vcc->pop;
2178         vcc->user_back = vpriv;
2179         vcc->pop = lec_pop;
2180         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2181         to_add = make_entry(priv, mac_addr);
2182         if (!to_add) {
2183                 vcc->pop = vpriv->old_pop;
2184                 kfree(vpriv);
2185                 err = -ENOMEM;
2186                 goto out;
2187         }
2188         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2189         to_add->status = ESI_FORWARD_DIRECT;
2190         to_add->flags |= LEC_PERMANENT_FLAG;
2191         to_add->vcc = vcc;
2192         to_add->old_push = vcc->push;
2193         vcc->push = lec_push;
2194         priv->mcast_vcc = vcc;
2195         lec_arp_add(priv, to_add);
2196 out:
2197         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2198         return err;
2199 }
2200
2201 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2202 {
2203         unsigned long flags;
2204         struct hlist_node *next;
2205         struct lec_arp_table *entry;
2206         int i;
2207
2208         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2209         dump_arp_table(priv);
2210
2211         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2212
2213         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2214                 hlist_for_each_entry_safe(entry, next,
2215                                           &priv->lec_arp_tables[i], next) {
2216                         if (vcc == entry->vcc) {
2217                                 lec_arp_remove(priv, entry);
2218                                 lec_arp_put(entry);
2219                                 if (priv->mcast_vcc == vcc)
2220                                         priv->mcast_vcc = NULL;
2221                         }
2222                 }
2223         }
2224
2225         hlist_for_each_entry_safe(entry, next,
2226                                   &priv->lec_arp_empty_ones, next) {
2227                 if (entry->vcc == vcc) {
2228                         lec_arp_clear_vccs(entry);
2229                         del_timer(&entry->timer);
2230                         hlist_del(&entry->next);
2231                         lec_arp_put(entry);
2232                 }
2233         }
2234
2235         hlist_for_each_entry_safe(entry, next,
2236                                   &priv->lec_no_forward, next) {
2237                 if (entry->recv_vcc == vcc) {
2238                         lec_arp_clear_vccs(entry);
2239                         del_timer(&entry->timer);
2240                         hlist_del(&entry->next);
2241                         lec_arp_put(entry);
2242                 }
2243         }
2244
2245         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2246                 if (entry->recv_vcc == vcc) {
2247                         lec_arp_clear_vccs(entry);
2248                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2249                         hlist_del(&entry->next);
2250                         lec_arp_put(entry);
2251                 }
2252         }
2253
2254         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2255         dump_arp_table(priv);
2256 }
2257
2258 static void
2259 lec_arp_check_empties(struct lec_priv *priv,
2260                       struct atm_vcc *vcc, struct sk_buff *skb)
2261 {
2262         unsigned long flags;
2263         struct hlist_node *next;
2264         struct lec_arp_table *entry, *tmp;
2265         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2266         unsigned char *src = hdr->h_source;
2267
2268         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2269         hlist_for_each_entry_safe(entry, next,
2270                                   &priv->lec_arp_empty_ones, next) {
2271                 if (vcc == entry->vcc) {
2272                         del_timer(&entry->timer);
2273                         ether_addr_copy(entry->mac_addr, src);
2274                         entry->status = ESI_FORWARD_DIRECT;
2275                         entry->last_used = jiffies;
2276                         /* We might have got an entry */
2277                         tmp = lec_arp_find(priv, src);
2278                         if (tmp) {
2279                                 lec_arp_remove(priv, tmp);
2280                                 lec_arp_put(tmp);
2281                         }
2282                         hlist_del(&entry->next);
2283                         lec_arp_add(priv, entry);
2284                         goto out;
2285                 }
2286         }
2287         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2288 out:
2289         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2290 }
2291
2292 MODULE_LICENSE("GPL");