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_SKB(skb)->atm_options = vcc->atm_options;
 186
 187         refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 188         if (vcc->send(vcc, skb) < 0) {
 189                 dev->stats.tx_dropped++;
 190                 return;
 191         }
 192
 193         dev->stats.tx_packets++;
 194         dev->stats.tx_bytes += skb->len;
 195 }
 196
 197 static void lec_tx_timeout(struct net_device *dev)
 198 {
 199         pr_info("%s\n", dev->name);
 200         netif_trans_update(dev);
 201         netif_wake_queue(dev);
 202 }
 203
 204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 205                                   struct net_device *dev)
 206 {
 207         struct sk_buff *skb2;
 208         struct lec_priv *priv = netdev_priv(dev);
 209         struct lecdatahdr_8023 *lec_h;
 210         struct atm_vcc *vcc;
 211         struct lec_arp_table *entry;
 212         unsigned char *dst;
 213         int min_frame_size;
 214         int is_rdesc;
 215
 216         pr_debug("called\n");
 217         if (!priv->lecd) {
 218                 pr_info("%s:No lecd attached\n", dev->name);
 219                 dev->stats.tx_errors++;
 220                 netif_stop_queue(dev);
 221                 kfree_skb(skb);
 222                 return NETDEV_TX_OK;
 223         }
 224
 225         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 226                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 227                  (long)skb_end_pointer(skb));
 228 #if IS_ENABLED(CONFIG_BRIDGE)
 229         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 230                 lec_handle_bridge(skb, dev);
 231 #endif
 232
 233         /* Make sure we have room for lec_id */
 234         if (skb_headroom(skb) < 2) {
 235                 pr_debug("reallocating skb\n");
 236                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 237                 if (unlikely(!skb2)) {
 238                         kfree_skb(skb);
 239                         return NETDEV_TX_OK;
 240                 }
 241                 consume_skb(skb);
 242                 skb = skb2;
 243         }
 244         skb_push(skb, 2);
 245
 246         /* Put le header to place */
 247         lec_h = (struct lecdatahdr_8023 *)skb->data;
 248         lec_h->le_header = htons(priv->lecid);
 249
 250 #if DUMP_PACKETS >= 2
 251 #define MAX_DUMP_SKB 99
 252 #elif DUMP_PACKETS >= 1
 253 #define MAX_DUMP_SKB 30
 254 #endif
 255 #if DUMP_PACKETS >= 1
 256         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 257                dev->name, skb->len, priv->lecid);
 258         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 259                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 260 #endif /* DUMP_PACKETS >= 1 */
 261
 262         /* Minimum ethernet-frame size */
 263         min_frame_size = LEC_MINIMUM_8023_SIZE;
 264         if (skb->len < min_frame_size) {
 265                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 266                         skb2 = skb_copy_expand(skb, 0,
 267                                                min_frame_size - skb->truesize,
 268                                                GFP_ATOMIC);
 269                         dev_kfree_skb(skb);
 270                         if (skb2 == NULL) {
 271                                 dev->stats.tx_dropped++;
 272                                 return NETDEV_TX_OK;
 273                         }
 274                         skb = skb2;
 275                 }
 276                 skb_put(skb, min_frame_size - skb->len);
 277         }
 278
 279         /* Send to right vcc */
 280         is_rdesc = 0;
 281         dst = lec_h->h_dest;
 282         entry = NULL;
 283         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 284         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 285                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 286         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 287                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 288                         pr_debug("%s:queuing packet, MAC address %pM\n",
 289                                  dev->name, lec_h->h_dest);
 290                         skb_queue_tail(&entry->tx_wait, skb);
 291                 } else {
 292                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 293                                  dev->name, lec_h->h_dest);
 294                         dev->stats.tx_dropped++;
 295                         dev_kfree_skb(skb);
 296                 }
 297                 goto out;
 298         }
 299 #if DUMP_PACKETS > 0
 300         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 301                dev->name, vcc->vpi, vcc->vci);
 302 #endif /* DUMP_PACKETS > 0 */
 303
 304         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 305                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 306                 lec_send(vcc, skb2);
 307         }
 308
 309         lec_send(vcc, skb);
 310
 311         if (!atm_may_send(vcc, 0)) {
 312                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 313
 314                 vpriv->xoff = 1;
 315                 netif_stop_queue(dev);
 316
 317                 /*
 318                  * vcc->pop() might have occurred in between, making
 319                  * the vcc usuable again.  Since xmit is serialized,
 320                  * this is the only situation we have to re-test.
 321                  */
 322
 323                 if (atm_may_send(vcc, 0))
 324                         netif_wake_queue(dev);
 325         }
 326
 327 out:
 328         if (entry)
 329                 lec_arp_put(entry);
 330         netif_trans_update(dev);
 331         return NETDEV_TX_OK;
 332 }
 333
 334 /* The inverse routine to net_open(). */
 335 static int lec_close(struct net_device *dev)
 336 {
 337         netif_stop_queue(dev);
 338         return 0;
 339 }
 340
 341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 342 {
 343         unsigned long flags;
 344         struct net_device *dev = (struct net_device *)vcc->proto_data;
 345         struct lec_priv *priv = netdev_priv(dev);
 346         struct atmlec_msg *mesg;
 347         struct lec_arp_table *entry;
 348         int i;
 349         char *tmp;              /* FIXME */
 350
 351         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 352         mesg = (struct atmlec_msg *)skb->data;
 353         tmp = skb->data;
 354         tmp += sizeof(struct atmlec_msg);
 355         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 356         switch (mesg->type) {
 357         case l_set_mac_addr:
 358                 for (i = 0; i < 6; i++)
 359                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 360                 break;
 361         case l_del_mac_addr:
 362                 for (i = 0; i < 6; i++)
 363                         dev->dev_addr[i] = 0;
 364                 break;
 365         case l_addr_delete:
 366                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 367                                 mesg->content.normal.flag);
 368                 break;
 369         case l_topology_change:
 370                 priv->topology_change = mesg->content.normal.flag;
 371                 break;
 372         case l_flush_complete:
 373                 lec_flush_complete(priv, mesg->content.normal.flag);
 374                 break;
 375         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 376                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 377                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 378                 lec_arp_remove(priv, entry);
 379                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 380
 381                 if (mesg->content.normal.no_source_le_narp)
 382                         break;
 383                 /* FALL THROUGH */
 384         case l_arp_update:
 385                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 386                                mesg->content.normal.atm_addr,
 387                                mesg->content.normal.flag,
 388                                mesg->content.normal.targetless_le_arp);
 389                 pr_debug("in l_arp_update\n");
 390                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 391                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 392                                  mesg->sizeoftlvs);
 393                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 394                                             tmp, mesg->sizeoftlvs);
 395                 }
 396                 break;
 397         case l_config:
 398                 priv->maximum_unknown_frame_count =
 399                     mesg->content.config.maximum_unknown_frame_count;
 400                 priv->max_unknown_frame_time =
 401                     (mesg->content.config.max_unknown_frame_time * HZ);
 402                 priv->max_retry_count = mesg->content.config.max_retry_count;
 403                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 404                 priv->forward_delay_time =
 405                     (mesg->content.config.forward_delay_time * HZ);
 406                 priv->arp_response_time =
 407                     (mesg->content.config.arp_response_time * HZ);
 408                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 409                 priv->path_switching_delay =
 410                     (mesg->content.config.path_switching_delay * HZ);
 411                 priv->lane_version = mesg->content.config.lane_version;
 412                                         /* LANE2 */
 413                 priv->lane2_ops = NULL;
 414                 if (priv->lane_version > 1)
 415                         priv->lane2_ops = &lane2_ops;
 416                 rtnl_lock();
 417                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 418                         pr_info("%s: change_mtu to %d failed\n",
 419                                 dev->name, mesg->content.config.mtu);
 420                 rtnl_unlock();
 421                 priv->is_proxy = mesg->content.config.is_proxy;
 422                 break;
 423         case l_flush_tran_id:
 424                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 425                                       mesg->content.normal.flag);
 426                 break;
 427         case l_set_lecid:
 428                 priv->lecid =
 429                     (unsigned short)(0xffff & mesg->content.normal.flag);
 430                 break;
 431         case l_should_bridge:
 432 #if IS_ENABLED(CONFIG_BRIDGE)
 433         {
 434                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 435                          dev->name, mesg->content.proxy.mac_addr);
 436
 437                 if (br_fdb_test_addr_hook == NULL)
 438                         break;
 439
 440                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 441                         /* hit from bridge table, send LE_ARP_RESPONSE */
 442                         struct sk_buff *skb2;
 443                         struct sock *sk;
 444
 445                         pr_debug("%s: entry found, responding to zeppelin\n",
 446                                  dev->name);
 447                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 448                         if (skb2 == NULL)
 449                                 break;
 450                         skb2->len = sizeof(struct atmlec_msg);
 451                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 452                         atm_force_charge(priv->lecd, skb2->truesize);
 453                         sk = sk_atm(priv->lecd);
 454                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 455                         sk->sk_data_ready(sk);
 456                 }
 457         }
 458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 459                 break;
 460         default:
 461                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 462                 dev_kfree_skb(skb);
 463                 return -EINVAL;
 464         }
 465         dev_kfree_skb(skb);
 466         return 0;
 467 }
 468
 469 static void lec_atm_close(struct atm_vcc *vcc)
 470 {
 471         struct sk_buff *skb;
 472         struct net_device *dev = (struct net_device *)vcc->proto_data;
 473         struct lec_priv *priv = netdev_priv(dev);
 474
 475         priv->lecd = NULL;
 476         /* Do something needful? */
 477
 478         netif_stop_queue(dev);
 479         lec_arp_destroy(priv);
 480
 481         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 482                 pr_info("%s closing with messages pending\n", dev->name);
 483         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 484                 atm_return(vcc, skb->truesize);
 485                 dev_kfree_skb(skb);
 486         }
 487
 488         pr_info("%s: Shut down!\n", dev->name);
 489         module_put(THIS_MODULE);
 490 }
 491
 492 static const struct atmdev_ops lecdev_ops = {
 493         .close = lec_atm_close,
 494         .send = lec_atm_send
 495 };
 496
 497 static struct atm_dev lecatm_dev = {
 498         .ops = &lecdev_ops,
 499         .type = "lec",
 500         .number = 999,          /* dummy device number */
 501         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 502 };
 503
 504 /*
 505  * LANE2: new argument struct sk_buff *data contains
 506  * the LE_ARP based TLVs introduced in the LANE2 spec
 507  */
 508 static int
 509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 510              const unsigned char *mac_addr, const unsigned char *atm_addr,
 511              struct sk_buff *data)
 512 {
 513         struct sock *sk;
 514         struct sk_buff *skb;
 515         struct atmlec_msg *mesg;
 516
 517         if (!priv || !priv->lecd)
 518                 return -1;
 519         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 520         if (!skb)
 521                 return -1;
 522         skb->len = sizeof(struct atmlec_msg);
 523         mesg = (struct atmlec_msg *)skb->data;
 524         memset(mesg, 0, sizeof(struct atmlec_msg));
 525         mesg->type = type;
 526         if (data != NULL)
 527                 mesg->sizeoftlvs = data->len;
 528         if (mac_addr)
 529                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 530         else
 531                 mesg->content.normal.targetless_le_arp = 1;
 532         if (atm_addr)
 533                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 534
 535         atm_force_charge(priv->lecd, skb->truesize);
 536         sk = sk_atm(priv->lecd);
 537         skb_queue_tail(&sk->sk_receive_queue, skb);
 538         sk->sk_data_ready(sk);
 539
 540         if (data != NULL) {
 541                 pr_debug("about to send %d bytes of data\n", data->len);
 542                 atm_force_charge(priv->lecd, data->truesize);
 543                 skb_queue_tail(&sk->sk_receive_queue, data);
 544                 sk->sk_data_ready(sk);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static void lec_set_multicast_list(struct net_device *dev)
 551 {
 552         /*
 553          * by default, all multicast frames arrive over the bus.
 554          * eventually support selective multicast service
 555          */
 556 }
 557
 558 static const struct net_device_ops lec_netdev_ops = {
 559         .ndo_open               = lec_open,
 560         .ndo_stop               = lec_close,
 561         .ndo_start_xmit         = lec_start_xmit,
 562         .ndo_tx_timeout         = lec_tx_timeout,
 563         .ndo_set_rx_mode        = lec_set_multicast_list,
 564 };
 565
 566 static const unsigned char lec_ctrl_magic[] = {
 567         0xff,
 568         0x00,
 569         0x01,
 570         0x01
 571 };
 572
 573 #define LEC_DATA_DIRECT_8023  2
 574 #define LEC_DATA_DIRECT_8025  3
 575
 576 static int lec_is_data_direct(struct atm_vcc *vcc)
 577 {
 578         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 579                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 580 }
 581
 582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 583 {
 584         unsigned long flags;
 585         struct net_device *dev = (struct net_device *)vcc->proto_data;
 586         struct lec_priv *priv = netdev_priv(dev);
 587
 588 #if DUMP_PACKETS > 0
 589         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 590                dev->name, vcc->vpi, vcc->vci);
 591 #endif
 592         if (!skb) {
 593                 pr_debug("%s: null skb\n", dev->name);
 594                 lec_vcc_close(priv, vcc);
 595                 return;
 596         }
 597 #if DUMP_PACKETS >= 2
 598 #define MAX_SKB_DUMP 99
 599 #elif DUMP_PACKETS >= 1
 600 #define MAX_SKB_DUMP 30
 601 #endif
 602 #if DUMP_PACKETS > 0
 603         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 604                dev->name, skb->len, priv->lecid);
 605         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 606                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 607 #endif /* DUMP_PACKETS > 0 */
 608         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 609                                 /* Control frame, to daemon */
 610                 struct sock *sk = sk_atm(vcc);
 611
 612                 pr_debug("%s: To daemon\n", dev->name);
 613                 skb_queue_tail(&sk->sk_receive_queue, skb);
 614                 sk->sk_data_ready(sk);
 615         } else {                /* Data frame, queue to protocol handlers */
 616                 struct lec_arp_table *entry;
 617                 unsigned char *src, *dst;
 618
 619                 atm_return(vcc, skb->truesize);
 620                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 621                     !priv->lecd || !(dev->flags & IFF_UP)) {
 622                         /*
 623                          * Probably looping back, or if lecd is missing,
 624                          * lecd has gone down
 625                          */
 626                         pr_debug("Ignoring frame...\n");
 627                         dev_kfree_skb(skb);
 628                         return;
 629                 }
 630                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 631
 632                 /*
 633                  * If this is a Data Direct VCC, and the VCC does not match
 634                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 635                  */
 636                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 637                 if (lec_is_data_direct(vcc)) {
 638                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 639                         entry = lec_arp_find(priv, src);
 640                         if (entry && entry->vcc != vcc) {
 641                                 lec_arp_remove(priv, entry);
 642                                 lec_arp_put(entry);
 643                         }
 644                 }
 645                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 646
 647                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 648                     !priv->is_proxy &&  /* Proxy wants all the packets */
 649                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 650                         dev_kfree_skb(skb);
 651                         return;
 652                 }
 653                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 654                         lec_arp_check_empties(priv, vcc, skb);
 655                 skb_pull(skb, 2);       /* skip lec_id */
 656                 skb->protocol = eth_type_trans(skb, dev);
 657                 dev->stats.rx_packets++;
 658                 dev->stats.rx_bytes += skb->len;
 659                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 660                 netif_rx(skb);
 661         }
 662 }
 663
 664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 665 {
 666         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 667         struct net_device *dev = skb->dev;
 668
 669         if (vpriv == NULL) {
 670                 pr_info("vpriv = NULL!?!?!?\n");
 671                 return;
 672         }
 673
 674         vpriv->old_pop(vcc, skb);
 675
 676         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 677                 vpriv->xoff = 0;
 678                 if (netif_running(dev) && netif_queue_stopped(dev))
 679                         netif_wake_queue(dev);
 680         }
 681 }
 682
 683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 684 {
 685         struct lec_vcc_priv *vpriv;
 686         int bytes_left;
 687         struct atmlec_ioc ioc_data;
 688
 689         /* Lecd must be up in this case */
 690         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 691         if (bytes_left != 0)
 692                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 693         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 694                 return -EINVAL;
 695         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 696         if (!dev_lec[ioc_data.dev_num])
 697                 return -EINVAL;
 698         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 699         if (!vpriv)
 700                 return -ENOMEM;
 701         vpriv->xoff = 0;
 702         vpriv->old_pop = vcc->pop;
 703         vcc->user_back = vpriv;
 704         vcc->pop = lec_pop;
 705         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 706                       &ioc_data, vcc, vcc->push);
 707         vcc->proto_data = dev_lec[ioc_data.dev_num];
 708         vcc->push = lec_push;
 709         return 0;
 710 }
 711
 712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 713 {
 714         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 715                 return -EINVAL;
 716         vcc->proto_data = dev_lec[arg];
 717         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 718 }
 719
 720 /* Initialize device. */
 721 static int lecd_attach(struct atm_vcc *vcc, int arg)
 722 {
 723         int i;
 724         struct lec_priv *priv;
 725
 726         if (arg < 0)
 727                 i = 0;
 728         else
 729                 i = arg;
 730         if (arg >= MAX_LEC_ITF)
 731                 return -EINVAL;
 732         if (!dev_lec[i]) {
 733                 int size;
 734
 735                 size = sizeof(struct lec_priv);
 736                 dev_lec[i] = alloc_etherdev(size);
 737                 if (!dev_lec[i])
 738                         return -ENOMEM;
 739                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 740                 dev_lec[i]->max_mtu = 18190;
 741                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 742                 if (register_netdev(dev_lec[i])) {
 743                         free_netdev(dev_lec[i]);
 744                         return -EINVAL;
 745                 }
 746
 747                 priv = netdev_priv(dev_lec[i]);
 748         } else {
 749                 priv = netdev_priv(dev_lec[i]);
 750                 if (priv->lecd)
 751                         return -EADDRINUSE;
 752         }
 753         lec_arp_init(priv);
 754         priv->itfnum = i;       /* LANE2 addition */
 755         priv->lecd = vcc;
 756         vcc->dev = &lecatm_dev;
 757         vcc_insert_socket(sk_atm(vcc));
 758
 759         vcc->proto_data = dev_lec[i];
 760         set_bit(ATM_VF_META, &vcc->flags);
 761         set_bit(ATM_VF_READY, &vcc->flags);
 762
 763         /* Set default values to these variables */
 764         priv->maximum_unknown_frame_count = 1;
 765         priv->max_unknown_frame_time = (1 * HZ);
 766         priv->vcc_timeout_period = (1200 * HZ);
 767         priv->max_retry_count = 1;
 768         priv->aging_time = (300 * HZ);
 769         priv->forward_delay_time = (15 * HZ);
 770         priv->topology_change = 0;
 771         priv->arp_response_time = (1 * HZ);
 772         priv->flush_timeout = (4 * HZ);
 773         priv->path_switching_delay = (6 * HZ);
 774
 775         if (dev_lec[i]->flags & IFF_UP)
 776                 netif_start_queue(dev_lec[i]);
 777         __module_get(THIS_MODULE);
 778         return i;
 779 }
 780
 781 #ifdef CONFIG_PROC_FS
 782 static const char *lec_arp_get_status_string(unsigned char status)
 783 {
 784         static const char *const lec_arp_status_string[] = {
 785                 "ESI_UNKNOWN       ",
 786                 "ESI_ARP_PENDING   ",
 787                 "ESI_VC_PENDING    ",
 788                 "<Undefined>       ",
 789                 "ESI_FLUSH_PENDING ",
 790                 "ESI_FORWARD_DIRECT"
 791         };
 792
 793         if (status > ESI_FORWARD_DIRECT)
 794                 status = 3;     /* ESI_UNDEFINED */
 795         return lec_arp_status_string[status];
 796 }
 797
 798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 799 {
 800         int i;
 801
 802         for (i = 0; i < ETH_ALEN; i++)
 803                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 804         seq_printf(seq, " ");
 805         for (i = 0; i < ATM_ESA_LEN; i++)
 806                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 807         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 808                    entry->flags & 0xffff);
 809         if (entry->vcc)
 810                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 811         else
 812                 seq_printf(seq, "        ");
 813         if (entry->recv_vcc) {
 814                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 815                            entry->recv_vcc->vci);
 816         }
 817         seq_putc(seq, '\n');
 818 }
 819
 820 struct lec_state {
 821         unsigned long flags;
 822         struct lec_priv *locked;
 823         struct hlist_node *node;
 824         struct net_device *dev;
 825         int itf;
 826         int arp_table;
 827         int misc_table;
 828 };
 829
 830 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 831                           loff_t *l)
 832 {
 833         struct hlist_node *e = state->node;
 834
 835         if (!e)
 836                 e = tbl->first;
 837         if (e == SEQ_START_TOKEN) {
 838                 e = tbl->first;
 839                 --*l;
 840         }
 841
 842         for (; e; e = e->next) {
 843                 if (--*l < 0)
 844                         break;
 845         }
 846         state->node = e;
 847
 848         return (*l < 0) ? state : NULL;
 849 }
 850
 851 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 852                           struct lec_priv *priv)
 853 {
 854         void *v = NULL;
 855         int p;
 856
 857         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 858                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 859                 if (v)
 860                         break;
 861         }
 862         state->arp_table = p;
 863         return v;
 864 }
 865
 866 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 867                            struct lec_priv *priv)
 868 {
 869         struct hlist_head *lec_misc_tables[] = {
 870                 &priv->lec_arp_empty_ones,
 871                 &priv->lec_no_forward,
 872                 &priv->mcast_fwds
 873         };
 874         void *v = NULL;
 875         int q;
 876
 877         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 878                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 879                 if (v)
 880                         break;
 881         }
 882         state->misc_table = q;
 883         return v;
 884 }
 885
 886 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 887                            struct lec_priv *priv)
 888 {
 889         if (!state->locked) {
 890                 state->locked = priv;
 891                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 892         }
 893         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 894                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 895                 state->locked = NULL;
 896                 /* Partial state reset for the next time we get called */
 897                 state->arp_table = state->misc_table = 0;
 898         }
 899         return state->locked;
 900 }
 901
 902 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 903 {
 904         struct net_device *dev;
 905         void *v;
 906
 907         dev = state->dev ? state->dev : dev_lec[state->itf];
 908         v = (dev && netdev_priv(dev)) ?
 909                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 910         if (!v && dev) {
 911                 dev_put(dev);
 912                 /* Partial state reset for the next time we get called */
 913                 dev = NULL;
 914         }
 915         state->dev = dev;
 916         return v;
 917 }
 918
 919 static void *lec_get_idx(struct lec_state *state, loff_t l)
 920 {
 921         void *v = NULL;
 922
 923         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 924                 v = lec_itf_walk(state, &l);
 925                 if (v)
 926                         break;
 927         }
 928         return v;
 929 }
 930
 931 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 932 {
 933         struct lec_state *state = seq->private;
 934
 935         state->itf = 0;
 936         state->dev = NULL;
 937         state->locked = NULL;
 938         state->arp_table = 0;
 939         state->misc_table = 0;
 940         state->node = SEQ_START_TOKEN;
 941
 942         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 943 }
 944
 945 static void lec_seq_stop(struct seq_file *seq, void *v)
 946 {
 947         struct lec_state *state = seq->private;
 948
 949         if (state->dev) {
 950                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 951                                        state->flags);
 952                 dev_put(state->dev);
 953         }
 954 }
 955
 956 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 957 {
 958         struct lec_state *state = seq->private;
 959
 960         v = lec_get_idx(state, 1);
 961         *pos += !!PTR_ERR(v);
 962         return v;
 963 }
 964
 965 static int lec_seq_show(struct seq_file *seq, void *v)
 966 {
 967         static const char lec_banner[] =
 968             "Itf  MAC          ATM destination"
 969             "                          Status            Flags "
 970             "VPI/VCI Recv VPI/VCI\n";
 971
 972         if (v == SEQ_START_TOKEN)
 973                 seq_puts(seq, lec_banner);
 974         else {
 975                 struct lec_state *state = seq->private;
 976                 struct net_device *dev = state->dev;
 977                 struct lec_arp_table *entry = hlist_entry(state->node,
 978                                                           struct lec_arp_table,
 979                                                           next);
 980
 981                 seq_printf(seq, "%s ", dev->name);
 982                 lec_info(seq, entry);
 983         }
 984         return 0;
 985 }
 986
 987 static const struct seq_operations lec_seq_ops = {
 988         .start = lec_seq_start,
 989         .next = lec_seq_next,
 990         .stop = lec_seq_stop,
 991         .show = lec_seq_show,
 992 };
 993
 994 static int lec_seq_open(struct inode *inode, struct file *file)
 995 {
 996         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
 997 }
 998
 999 static const struct file_operations lec_seq_fops = {
1000         .open = lec_seq_open,
1001         .read = seq_read,
1002         .llseek = seq_lseek,
1003         .release = seq_release_private,
1004 };
1005 #endif
1006
1007 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1008 {
1009         struct atm_vcc *vcc = ATM_SD(sock);
1010         int err = 0;
1011
1012         switch (cmd) {
1013         case ATMLEC_CTRL:
1014         case ATMLEC_MCAST:
1015         case ATMLEC_DATA:
1016                 if (!capable(CAP_NET_ADMIN))
1017                         return -EPERM;
1018                 break;
1019         default:
1020                 return -ENOIOCTLCMD;
1021         }
1022
1023         switch (cmd) {
1024         case ATMLEC_CTRL:
1025                 err = lecd_attach(vcc, (int)arg);
1026                 if (err >= 0)
1027                         sock->state = SS_CONNECTED;
1028                 break;
1029         case ATMLEC_MCAST:
1030                 err = lec_mcast_attach(vcc, (int)arg);
1031                 break;
1032         case ATMLEC_DATA:
1033                 err = lec_vcc_attach(vcc, (void __user *)arg);
1034                 break;
1035         }
1036
1037         return err;
1038 }
1039
1040 static struct atm_ioctl lane_ioctl_ops = {
1041         .owner = THIS_MODULE,
1042         .ioctl = lane_ioctl,
1043 };
1044
1045 static int __init lane_module_init(void)
1046 {
1047 #ifdef CONFIG_PROC_FS
1048         struct proc_dir_entry *p;
1049
1050         p = proc_create("lec", 0444, atm_proc_root, &lec_seq_fops);
1051         if (!p) {
1052                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1053                 return -ENOMEM;
1054         }
1055 #endif
1056
1057         register_atm_ioctl(&lane_ioctl_ops);
1058         pr_info("lec.c: initialized\n");
1059         return 0;
1060 }
1061
1062 static void __exit lane_module_cleanup(void)
1063 {
1064         int i;
1065
1066 #ifdef CONFIG_PROC_FS
1067         remove_proc_entry("lec", atm_proc_root);
1068 #endif
1069
1070         deregister_atm_ioctl(&lane_ioctl_ops);
1071
1072         for (i = 0; i < MAX_LEC_ITF; i++) {
1073                 if (dev_lec[i] != NULL) {
1074                         unregister_netdev(dev_lec[i]);
1075                         free_netdev(dev_lec[i]);
1076                         dev_lec[i] = NULL;
1077                 }
1078         }
1079 }
1080
1081 module_init(lane_module_init);
1082 module_exit(lane_module_cleanup);
1083
1084 /*
1085  * LANE2: 3.1.3, LE_RESOLVE.request
1086  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1087  * If sizeoftlvs == NULL the default TLVs associated with with this
1088  * lec will be used.
1089  * If dst_mac == NULL, targetless LE_ARP will be sent
1090  */
1091 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1092                          u8 **tlvs, u32 *sizeoftlvs)
1093 {
1094         unsigned long flags;
1095         struct lec_priv *priv = netdev_priv(dev);
1096         struct lec_arp_table *table;
1097         struct sk_buff *skb;
1098         int retval;
1099
1100         if (force == 0) {
1101                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1102                 table = lec_arp_find(priv, dst_mac);
1103                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1104                 if (table == NULL)
1105                         return -1;
1106
1107                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1108                 if (*tlvs == NULL)
1109                         return -1;
1110
1111                 *sizeoftlvs = table->sizeoftlvs;
1112
1113                 return 0;
1114         }
1115
1116         if (sizeoftlvs == NULL)
1117                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1118
1119         else {
1120                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1121                 if (skb == NULL)
1122                         return -1;
1123                 skb->len = *sizeoftlvs;
1124                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1125                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1126         }
1127         return retval;
1128 }
1129
1130 /*
1131  * LANE2: 3.1.4, LE_ASSOCIATE.request
1132  * Associate the *tlvs with the *lan_dst address.
1133  * Will overwrite any previous association
1134  * Returns 1 for success, 0 for failure (out of memory)
1135  *
1136  */
1137 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1138                                const u8 *tlvs, u32 sizeoftlvs)
1139 {
1140         int retval;
1141         struct sk_buff *skb;
1142         struct lec_priv *priv = netdev_priv(dev);
1143
1144         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1145                 return 0;       /* not our mac address */
1146
1147         kfree(priv->tlvs);      /* NULL if there was no previous association */
1148
1149         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1150         if (priv->tlvs == NULL)
1151                 return 0;
1152         priv->sizeoftlvs = sizeoftlvs;
1153
1154         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1155         if (skb == NULL)
1156                 return 0;
1157         skb->len = sizeoftlvs;
1158         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1159         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1160         if (retval != 0)
1161                 pr_info("lec.c: lane2_associate_req() failed\n");
1162         /*
1163          * If the previous association has changed we must
1164          * somehow notify other LANE entities about the change
1165          */
1166         return 1;
1167 }
1168
1169 /*
1170  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1171  *
1172  */
1173 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1174                                 const u8 *tlvs, u32 sizeoftlvs)
1175 {
1176 #if 0
1177         int i = 0;
1178 #endif
1179         struct lec_priv *priv = netdev_priv(dev);
1180 #if 0                           /*
1181                                  * Why have the TLVs in LE_ARP entries
1182                                  * since we do not use them? When you
1183                                  * uncomment this code, make sure the
1184                                  * TLVs get freed when entry is killed
1185                                  */
1186         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1187
1188         if (entry == NULL)
1189                 return;         /* should not happen */
1190
1191         kfree(entry->tlvs);
1192
1193         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1194         if (entry->tlvs == NULL)
1195                 return;
1196         entry->sizeoftlvs = sizeoftlvs;
1197 #endif
1198 #if 0
1199         pr_info("\n");
1200         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1201         while (i < sizeoftlvs)
1202                 pr_cont("%02x ", tlvs[i++]);
1203
1204         pr_cont("\n");
1205 #endif
1206
1207         /* tell MPOA about the TLVs we saw */
1208         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1209                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1210                                                      tlvs, sizeoftlvs);
1211         }
1212 }
1213
1214 /*
1215  * Here starts what used to lec_arpc.c
1216  *
1217  * lec_arpc.c was added here when making
1218  * lane client modular. October 1997
1219  */
1220
1221 #include <linux/types.h>
1222 #include <linux/timer.h>
1223 #include <linux/param.h>
1224 #include <linux/atomic.h>
1225 #include <linux/inetdevice.h>
1226 #include <net/route.h>
1227
1228 #if 0
1229 #define pr_debug(format, args...)
1230 /*
1231   #define pr_debug printk
1232 */
1233 #endif
1234 #define DEBUG_ARP_TABLE 0
1235
1236 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1237
1238 static void lec_arp_check_expire(struct work_struct *work);
1239 static void lec_arp_expire_arp(struct timer_list *t);
1240
1241 /*
1242  * Arp table funcs
1243  */
1244
1245 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1246
1247 /*
1248  * Initialization of arp-cache
1249  */
1250 static void lec_arp_init(struct lec_priv *priv)
1251 {
1252         unsigned short i;
1253
1254         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1255                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1256         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1257         INIT_HLIST_HEAD(&priv->lec_no_forward);
1258         INIT_HLIST_HEAD(&priv->mcast_fwds);
1259         spin_lock_init(&priv->lec_arp_lock);
1260         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1261         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1262 }
1263
1264 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1265 {
1266         if (entry->vcc) {
1267                 struct atm_vcc *vcc = entry->vcc;
1268                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1269                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1270
1271                 vcc->pop = vpriv->old_pop;
1272                 if (vpriv->xoff)
1273                         netif_wake_queue(dev);
1274                 kfree(vpriv);
1275                 vcc->user_back = NULL;
1276                 vcc->push = entry->old_push;
1277                 vcc_release_async(vcc, -EPIPE);
1278                 entry->vcc = NULL;
1279         }
1280         if (entry->recv_vcc) {
1281                 entry->recv_vcc->push = entry->old_recv_push;
1282                 vcc_release_async(entry->recv_vcc, -EPIPE);
1283                 entry->recv_vcc = NULL;
1284         }
1285 }
1286
1287 /*
1288  * Insert entry to lec_arp_table
1289  * LANE2: Add to the end of the list to satisfy 8.1.13
1290  */
1291 static inline void
1292 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1293 {
1294         struct hlist_head *tmp;
1295
1296         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1297         hlist_add_head(&entry->next, tmp);
1298
1299         pr_debug("Added entry:%pM\n", entry->mac_addr);
1300 }
1301
1302 /*
1303  * Remove entry from lec_arp_table
1304  */
1305 static int
1306 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1307 {
1308         struct lec_arp_table *entry;
1309         int i, remove_vcc = 1;
1310
1311         if (!to_remove)
1312                 return -1;
1313
1314         hlist_del(&to_remove->next);
1315         del_timer(&to_remove->timer);
1316
1317         /*
1318          * If this is the only MAC connected to this VCC,
1319          * also tear down the VCC
1320          */
1321         if (to_remove->status >= ESI_FLUSH_PENDING) {
1322                 /*
1323                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1324                  */
1325                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1326                         hlist_for_each_entry(entry,
1327                                              &priv->lec_arp_tables[i], next) {
1328                                 if (memcmp(to_remove->atm_addr,
1329                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1330                                         remove_vcc = 0;
1331                                         break;
1332                                 }
1333                         }
1334                 }
1335                 if (remove_vcc)
1336                         lec_arp_clear_vccs(to_remove);
1337         }
1338         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1339
1340         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1341         return 0;
1342 }
1343
1344 #if DEBUG_ARP_TABLE
1345 static const char *get_status_string(unsigned char st)
1346 {
1347         switch (st) {
1348         case ESI_UNKNOWN:
1349                 return "ESI_UNKNOWN";
1350         case ESI_ARP_PENDING:
1351                 return "ESI_ARP_PENDING";
1352         case ESI_VC_PENDING:
1353                 return "ESI_VC_PENDING";
1354         case ESI_FLUSH_PENDING:
1355                 return "ESI_FLUSH_PENDING";
1356         case ESI_FORWARD_DIRECT:
1357                 return "ESI_FORWARD_DIRECT";
1358         }
1359         return "<UNKNOWN>";
1360 }
1361
1362 static void dump_arp_table(struct lec_priv *priv)
1363 {
1364         struct lec_arp_table *rulla;
1365         char buf[256];
1366         int i, j, offset;
1367
1368         pr_info("Dump %p:\n", priv);
1369         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1370                 hlist_for_each_entry(rulla,
1371                                      &priv->lec_arp_tables[i], next) {
1372                         offset = 0;
1373                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1374                         offset += sprintf(buf + offset, "Mac: %pM",
1375                                           rulla->mac_addr);
1376                         offset += sprintf(buf + offset, " Atm:");
1377                         for (j = 0; j < ATM_ESA_LEN; j++) {
1378                                 offset += sprintf(buf + offset,
1379                                                   "%2.2x ",
1380                                                   rulla->atm_addr[j] & 0xff);
1381                         }
1382                         offset += sprintf(buf + offset,
1383                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1384                                           rulla->vcc ? rulla->vcc->vpi : 0,
1385                                           rulla->vcc ? rulla->vcc->vci : 0,
1386                                           rulla->recv_vcc ? rulla->recv_vcc->
1387                                           vpi : 0,
1388                                           rulla->recv_vcc ? rulla->recv_vcc->
1389                                           vci : 0, rulla->last_used,
1390                                           rulla->timestamp, rulla->no_tries);
1391                         offset +=
1392                             sprintf(buf + offset,
1393                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1394                                     rulla->flags, rulla->packets_flooded,
1395                                     get_status_string(rulla->status));
1396                         pr_info("%s\n", buf);
1397                 }
1398         }
1399
1400         if (!hlist_empty(&priv->lec_no_forward))
1401                 pr_info("No forward\n");
1402         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1403                 offset = 0;
1404                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1405                 offset += sprintf(buf + offset, " Atm:");
1406                 for (j = 0; j < ATM_ESA_LEN; j++) {
1407                         offset += sprintf(buf + offset, "%2.2x ",
1408                                           rulla->atm_addr[j] & 0xff);
1409                 }
1410                 offset += sprintf(buf + offset,
1411                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1412                                   rulla->vcc ? rulla->vcc->vpi : 0,
1413                                   rulla->vcc ? rulla->vcc->vci : 0,
1414                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1415                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1416                                   rulla->last_used,
1417                                   rulla->timestamp, rulla->no_tries);
1418                 offset += sprintf(buf + offset,
1419                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1420                                   rulla->flags, rulla->packets_flooded,
1421                                   get_status_string(rulla->status));
1422                 pr_info("%s\n", buf);
1423         }
1424
1425         if (!hlist_empty(&priv->lec_arp_empty_ones))
1426                 pr_info("Empty ones\n");
1427         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1428                 offset = 0;
1429                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1430                 offset += sprintf(buf + offset, " Atm:");
1431                 for (j = 0; j < ATM_ESA_LEN; j++) {
1432                         offset += sprintf(buf + offset, "%2.2x ",
1433                                           rulla->atm_addr[j] & 0xff);
1434                 }
1435                 offset += sprintf(buf + offset,
1436                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1437                                   rulla->vcc ? rulla->vcc->vpi : 0,
1438                                   rulla->vcc ? rulla->vcc->vci : 0,
1439                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1440                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1441                                   rulla->last_used,
1442                                   rulla->timestamp, rulla->no_tries);
1443                 offset += sprintf(buf + offset,
1444                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1445                                   rulla->flags, rulla->packets_flooded,
1446                                   get_status_string(rulla->status));
1447                 pr_info("%s", buf);
1448         }
1449
1450         if (!hlist_empty(&priv->mcast_fwds))
1451                 pr_info("Multicast Forward VCCs\n");
1452         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1453                 offset = 0;
1454                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1455                 offset += sprintf(buf + offset, " Atm:");
1456                 for (j = 0; j < ATM_ESA_LEN; j++) {
1457                         offset += sprintf(buf + offset, "%2.2x ",
1458                                           rulla->atm_addr[j] & 0xff);
1459                 }
1460                 offset += sprintf(buf + offset,
1461                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1462                                   rulla->vcc ? rulla->vcc->vpi : 0,
1463                                   rulla->vcc ? rulla->vcc->vci : 0,
1464                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1465                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1466                                   rulla->last_used,
1467                                   rulla->timestamp, rulla->no_tries);
1468                 offset += sprintf(buf + offset,
1469                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1470                                   rulla->flags, rulla->packets_flooded,
1471                                   get_status_string(rulla->status));
1472                 pr_info("%s\n", buf);
1473         }
1474
1475 }
1476 #else
1477 #define dump_arp_table(priv) do { } while (0)
1478 #endif
1479
1480 /*
1481  * Destruction of arp-cache
1482  */
1483 static void lec_arp_destroy(struct lec_priv *priv)
1484 {
1485         unsigned long flags;
1486         struct hlist_node *next;
1487         struct lec_arp_table *entry;
1488         int i;
1489
1490         cancel_delayed_work_sync(&priv->lec_arp_work);
1491
1492         /*
1493          * Remove all entries
1494          */
1495
1496         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1497         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1498                 hlist_for_each_entry_safe(entry, next,
1499                                           &priv->lec_arp_tables[i], next) {
1500                         lec_arp_remove(priv, entry);
1501                         lec_arp_put(entry);
1502                 }
1503                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1504         }
1505
1506         hlist_for_each_entry_safe(entry, next,
1507                                   &priv->lec_arp_empty_ones, next) {
1508                 del_timer_sync(&entry->timer);
1509                 lec_arp_clear_vccs(entry);
1510                 hlist_del(&entry->next);
1511                 lec_arp_put(entry);
1512         }
1513         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1514
1515         hlist_for_each_entry_safe(entry, next,
1516                                   &priv->lec_no_forward, next) {
1517                 del_timer_sync(&entry->timer);
1518                 lec_arp_clear_vccs(entry);
1519                 hlist_del(&entry->next);
1520                 lec_arp_put(entry);
1521         }
1522         INIT_HLIST_HEAD(&priv->lec_no_forward);
1523
1524         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1525                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1526                 lec_arp_clear_vccs(entry);
1527                 hlist_del(&entry->next);
1528                 lec_arp_put(entry);
1529         }
1530         INIT_HLIST_HEAD(&priv->mcast_fwds);
1531         priv->mcast_vcc = NULL;
1532         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1533 }
1534
1535 /*
1536  * Find entry by mac_address
1537  */
1538 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1539                                           const unsigned char *mac_addr)
1540 {
1541         struct hlist_head *head;
1542         struct lec_arp_table *entry;
1543
1544         pr_debug("%pM\n", mac_addr);
1545
1546         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1547         hlist_for_each_entry(entry, head, next) {
1548                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1549                         return entry;
1550         }
1551         return NULL;
1552 }
1553
1554 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1555                                         const unsigned char *mac_addr)
1556 {
1557         struct lec_arp_table *to_return;
1558
1559         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1560         if (!to_return) {
1561                 pr_info("LEC: Arp entry kmalloc failed\n");
1562                 return NULL;
1563         }
1564         ether_addr_copy(to_return->mac_addr, mac_addr);
1565         INIT_HLIST_NODE(&to_return->next);
1566         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1567         to_return->last_used = jiffies;
1568         to_return->priv = priv;
1569         skb_queue_head_init(&to_return->tx_wait);
1570         refcount_set(&to_return->usage, 1);
1571         return to_return;
1572 }
1573
1574 /* Arp sent timer expired */
1575 static void lec_arp_expire_arp(struct timer_list *t)
1576 {
1577         struct lec_arp_table *entry;
1578
1579         entry = from_timer(entry, t, timer);
1580
1581         pr_debug("\n");
1582         if (entry->status == ESI_ARP_PENDING) {
1583                 if (entry->no_tries <= entry->priv->max_retry_count) {
1584                         if (entry->is_rdesc)
1585                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1586                                              entry->mac_addr, NULL, NULL);
1587                         else
1588                                 send_to_lecd(entry->priv, l_arp_xmt,
1589                                              entry->mac_addr, NULL, NULL);
1590                         entry->no_tries++;
1591                 }
1592                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1593         }
1594 }
1595
1596 /* Unknown/unused vcc expire, remove associated entry */
1597 static void lec_arp_expire_vcc(struct timer_list *t)
1598 {
1599         unsigned long flags;
1600         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1601         struct lec_priv *priv = to_remove->priv;
1602
1603         del_timer(&to_remove->timer);
1604
1605         pr_debug("%p %p: vpi:%d vci:%d\n",
1606                  to_remove, priv,
1607                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1608                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1609
1610         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1611         hlist_del(&to_remove->next);
1612         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1613
1614         lec_arp_clear_vccs(to_remove);
1615         lec_arp_put(to_remove);
1616 }
1617
1618 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1619                                    unsigned long now,
1620                                    struct lec_priv *priv)
1621 {
1622         unsigned long time_to_check;
1623
1624         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1625                 time_to_check = priv->forward_delay_time;
1626         else
1627                 time_to_check = priv->aging_time;
1628
1629         pr_debug("About to expire: %lx - %lx > %lx\n",
1630                  now, entry->last_used, time_to_check);
1631         if (time_after(now, entry->last_used + time_to_check) &&
1632             !(entry->flags & LEC_PERMANENT_FLAG) &&
1633             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1634                 /* Remove entry */
1635                 pr_debug("Entry timed out\n");
1636                 lec_arp_remove(priv, entry);
1637                 lec_arp_put(entry);
1638         } else {
1639                 /* Something else */
1640                 if ((entry->status == ESI_VC_PENDING ||
1641                      entry->status == ESI_ARP_PENDING) &&
1642                     time_after_eq(now, entry->timestamp +
1643                                        priv->max_unknown_frame_time)) {
1644                         entry->timestamp = jiffies;
1645                         entry->packets_flooded = 0;
1646                         if (entry->status == ESI_VC_PENDING)
1647                                 send_to_lecd(priv, l_svc_setup,
1648                                              entry->mac_addr,
1649                                              entry->atm_addr,
1650                                              NULL);
1651                 }
1652                 if (entry->status == ESI_FLUSH_PENDING &&
1653                     time_after_eq(now, entry->timestamp +
1654                                        priv->path_switching_delay)) {
1655                         lec_arp_hold(entry);
1656                         return true;
1657                 }
1658         }
1659
1660         return false;
1661 }
1662 /*
1663  * Expire entries.
1664  * 1. Re-set timer
1665  * 2. For each entry, delete entries that have aged past the age limit.
1666  * 3. For each entry, depending on the status of the entry, perform
1667  *    the following maintenance.
1668  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1669  *       tick_count is above the max_unknown_frame_time, clear
1670  *       the tick_count to zero and clear the packets_flooded counter
1671  *       to zero. This supports the packet rate limit per address
1672  *       while flooding unknowns.
1673  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1674  *       than or equal to the path_switching_delay, change the status
1675  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1676  *       regardless of the progress of the flush protocol.
1677  */
1678 static void lec_arp_check_expire(struct work_struct *work)
1679 {
1680         unsigned long flags;
1681         struct lec_priv *priv =
1682                 container_of(work, struct lec_priv, lec_arp_work.work);
1683         struct hlist_node *next;
1684         struct lec_arp_table *entry;
1685         unsigned long now;
1686         int i;
1687
1688         pr_debug("%p\n", priv);
1689         now = jiffies;
1690 restart:
1691         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1692         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1693                 hlist_for_each_entry_safe(entry, next,
1694                                           &priv->lec_arp_tables[i], next) {
1695                         if (__lec_arp_check_expire(entry, now, priv)) {
1696                                 struct sk_buff *skb;
1697                                 struct atm_vcc *vcc = entry->vcc;
1698
1699                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1700                                                        flags);
1701                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1702                                         lec_send(vcc, skb);
1703                                 entry->last_used = jiffies;
1704                                 entry->status = ESI_FORWARD_DIRECT;
1705                                 lec_arp_put(entry);
1706
1707                                 goto restart;
1708                         }
1709                 }
1710         }
1711         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1712
1713         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1714 }
1715
1716 /*
1717  * Try to find vcc where mac_address is attached.
1718  *
1719  */
1720 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1721                                        const unsigned char *mac_to_find,
1722                                        int is_rdesc,
1723                                        struct lec_arp_table **ret_entry)
1724 {
1725         unsigned long flags;
1726         struct lec_arp_table *entry;
1727         struct atm_vcc *found;
1728
1729         if (mac_to_find[0] & 0x01) {
1730                 switch (priv->lane_version) {
1731                 case 1:
1732                         return priv->mcast_vcc;
1733                 case 2: /* LANE2 wants arp for multicast addresses */
1734                         if (ether_addr_equal(mac_to_find, bus_mac))
1735                                 return priv->mcast_vcc;
1736                         break;
1737                 default:
1738                         break;
1739                 }
1740         }
1741
1742         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1743         entry = lec_arp_find(priv, mac_to_find);
1744
1745         if (entry) {
1746                 if (entry->status == ESI_FORWARD_DIRECT) {
1747                         /* Connection Ok */
1748                         entry->last_used = jiffies;
1749                         lec_arp_hold(entry);
1750                         *ret_entry = entry;
1751                         found = entry->vcc;
1752                         goto out;
1753                 }
1754                 /*
1755                  * If the LE_ARP cache entry is still pending, reset count to 0
1756                  * so another LE_ARP request can be made for this frame.
1757                  */
1758                 if (entry->status == ESI_ARP_PENDING)
1759                         entry->no_tries = 0;
1760                 /*
1761                  * Data direct VC not yet set up, check to see if the unknown
1762                  * frame count is greater than the limit. If the limit has
1763                  * not been reached, allow the caller to send packet to
1764                  * BUS.
1765                  */
1766                 if (entry->status != ESI_FLUSH_PENDING &&
1767                     entry->packets_flooded <
1768                     priv->maximum_unknown_frame_count) {
1769                         entry->packets_flooded++;
1770                         pr_debug("Flooding..\n");
1771                         found = priv->mcast_vcc;
1772                         goto out;
1773                 }
1774                 /*
1775                  * We got here because entry->status == ESI_FLUSH_PENDING
1776                  * or BUS flood limit was reached for an entry which is
1777                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1778                  */
1779                 lec_arp_hold(entry);
1780                 *ret_entry = entry;
1781                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1782                          entry->vcc);
1783                 found = NULL;
1784         } else {
1785                 /* No matching entry was found */
1786                 entry = make_entry(priv, mac_to_find);
1787                 pr_debug("Making entry\n");
1788                 if (!entry) {
1789                         found = priv->mcast_vcc;
1790                         goto out;
1791                 }
1792                 lec_arp_add(priv, entry);
1793                 /* We want arp-request(s) to be sent */
1794                 entry->packets_flooded = 1;
1795                 entry->status = ESI_ARP_PENDING;
1796                 entry->no_tries = 1;
1797                 entry->last_used = entry->timestamp = jiffies;
1798                 entry->is_rdesc = is_rdesc;
1799                 if (entry->is_rdesc)
1800                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1801                                      NULL);
1802                 else
1803                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1804                 entry->timer.expires = jiffies + (1 * HZ);
1805                 entry->timer.function = lec_arp_expire_arp;
1806                 add_timer(&entry->timer);
1807                 found = priv->mcast_vcc;
1808         }
1809
1810 out:
1811         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1812         return found;
1813 }
1814
1815 static int
1816 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1817                 unsigned long permanent)
1818 {
1819         unsigned long flags;
1820         struct hlist_node *next;
1821         struct lec_arp_table *entry;
1822         int i;
1823
1824         pr_debug("\n");
1825         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1826         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1827                 hlist_for_each_entry_safe(entry, next,
1828                                           &priv->lec_arp_tables[i], next) {
1829                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1830                             (permanent ||
1831                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1832                                 lec_arp_remove(priv, entry);
1833                                 lec_arp_put(entry);
1834                         }
1835                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1836                         return 0;
1837                 }
1838         }
1839         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1840         return -1;
1841 }
1842
1843 /*
1844  * Notifies:  Response to arp_request (atm_addr != NULL)
1845  */
1846 static void
1847 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1848                const unsigned char *atm_addr, unsigned long remoteflag,
1849                unsigned int targetless_le_arp)
1850 {
1851         unsigned long flags;
1852         struct hlist_node *next;
1853         struct lec_arp_table *entry, *tmp;
1854         int i;
1855
1856         pr_debug("%smac:%pM\n",
1857                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1858
1859         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1860         entry = lec_arp_find(priv, mac_addr);
1861         if (entry == NULL && targetless_le_arp)
1862                 goto out;       /*
1863                                  * LANE2: ignore targetless LE_ARPs for which
1864                                  * we have no entry in the cache. 7.1.30
1865                                  */
1866         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1867                 hlist_for_each_entry_safe(entry, next,
1868                                           &priv->lec_arp_empty_ones, next) {
1869                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1870                                 hlist_del(&entry->next);
1871                                 del_timer(&entry->timer);
1872                                 tmp = lec_arp_find(priv, mac_addr);
1873                                 if (tmp) {
1874                                         del_timer(&tmp->timer);
1875                                         tmp->status = ESI_FORWARD_DIRECT;
1876                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1877                                         tmp->vcc = entry->vcc;
1878                                         tmp->old_push = entry->old_push;
1879                                         tmp->last_used = jiffies;
1880                                         del_timer(&entry->timer);
1881                                         lec_arp_put(entry);
1882                                         entry = tmp;
1883                                 } else {
1884                                         entry->status = ESI_FORWARD_DIRECT;
1885                                         ether_addr_copy(entry->mac_addr,
1886                                                         mac_addr);
1887                                         entry->last_used = jiffies;
1888                                         lec_arp_add(priv, entry);
1889                                 }
1890                                 if (remoteflag)
1891                                         entry->flags |= LEC_REMOTE_FLAG;
1892                                 else
1893                                         entry->flags &= ~LEC_REMOTE_FLAG;
1894                                 pr_debug("After update\n");
1895                                 dump_arp_table(priv);
1896                                 goto out;
1897                         }
1898                 }
1899         }
1900
1901         entry = lec_arp_find(priv, mac_addr);
1902         if (!entry) {
1903                 entry = make_entry(priv, mac_addr);
1904                 if (!entry)
1905                         goto out;
1906                 entry->status = ESI_UNKNOWN;
1907                 lec_arp_add(priv, entry);
1908                 /* Temporary, changes before end of function */
1909         }
1910         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1911         del_timer(&entry->timer);
1912         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1913                 hlist_for_each_entry(tmp,
1914                                      &priv->lec_arp_tables[i], next) {
1915                         if (entry != tmp &&
1916                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1917                                 /* Vcc to this host exists */
1918                                 if (tmp->status > ESI_VC_PENDING) {
1919                                         /*
1920                                          * ESI_FLUSH_PENDING,
1921                                          * ESI_FORWARD_DIRECT
1922                                          */
1923                                         entry->vcc = tmp->vcc;
1924                                         entry->old_push = tmp->old_push;
1925                                 }
1926                                 entry->status = tmp->status;
1927                                 break;
1928                         }
1929                 }
1930         }
1931         if (remoteflag)
1932                 entry->flags |= LEC_REMOTE_FLAG;
1933         else
1934                 entry->flags &= ~LEC_REMOTE_FLAG;
1935         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1936                 entry->status = ESI_VC_PENDING;
1937                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1938         }
1939         pr_debug("After update2\n");
1940         dump_arp_table(priv);
1941 out:
1942         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1943 }
1944
1945 /*
1946  * Notifies: Vcc setup ready
1947  */
1948 static void
1949 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1950               struct atm_vcc *vcc,
1951               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1952 {
1953         unsigned long flags;
1954         struct lec_arp_table *entry;
1955         int i, found_entry = 0;
1956
1957         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1958         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1959         if (ioc_data->receive == 2) {
1960                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1961 #if 0
1962                 entry = lec_arp_find(priv, bus_mac);
1963                 if (!entry) {
1964                         pr_info("LEC_ARP: Multicast entry not found!\n");
1965                         goto out;
1966                 }
1967                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1968                 entry->recv_vcc = vcc;
1969                 entry->old_recv_push = old_push;
1970 #endif
1971                 entry = make_entry(priv, bus_mac);
1972                 if (entry == NULL)
1973                         goto out;
1974                 del_timer(&entry->timer);
1975                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1976                 entry->recv_vcc = vcc;
1977                 entry->old_recv_push = old_push;
1978                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1979                 goto out;
1980         } else if (ioc_data->receive == 1) {
1981                 /*
1982                  * Vcc which we don't want to make default vcc,
1983                  * attach it anyway.
1984                  */
1985                 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",
1986                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1987                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1988                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1989                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1990                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1991                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1992                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1993                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1994                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1995                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1996                 entry = make_entry(priv, bus_mac);
1997                 if (entry == NULL)
1998                         goto out;
1999                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2000                 eth_zero_addr(entry->mac_addr);
2001                 entry->recv_vcc = vcc;
2002                 entry->old_recv_push = old_push;
2003                 entry->status = ESI_UNKNOWN;
2004                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2005                 entry->timer.function = lec_arp_expire_vcc;
2006                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2007                 add_timer(&entry->timer);
2008                 dump_arp_table(priv);
2009                 goto out;
2010         }
2011         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",
2012                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2013                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2014                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2015                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2016                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2017                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2018                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2019                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2020                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2021                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2022         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2023                 hlist_for_each_entry(entry,
2024                                      &priv->lec_arp_tables[i], next) {
2025                         if (memcmp
2026                             (ioc_data->atm_addr, entry->atm_addr,
2027                              ATM_ESA_LEN) == 0) {
2028                                 pr_debug("LEC_ARP: Attaching data direct\n");
2029                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2030                                          entry->vcc ? entry->vcc->vci : 0,
2031                                          entry->recv_vcc ? entry->recv_vcc->
2032                                          vci : 0);
2033                                 found_entry = 1;
2034                                 del_timer(&entry->timer);
2035                                 entry->vcc = vcc;
2036                                 entry->old_push = old_push;
2037                                 if (entry->status == ESI_VC_PENDING) {
2038                                         if (priv->maximum_unknown_frame_count
2039                                             == 0)
2040                                                 entry->status =
2041                                                     ESI_FORWARD_DIRECT;
2042                                         else {
2043                                                 entry->timestamp = jiffies;
2044                                                 entry->status =
2045                                                     ESI_FLUSH_PENDING;
2046 #if 0
2047                                                 send_to_lecd(priv, l_flush_xmt,
2048                                                              NULL,
2049                                                              entry->atm_addr,
2050                                                              NULL);
2051 #endif
2052                                         }
2053                                 } else {
2054                                         /*
2055                                          * They were forming a connection
2056                                          * to us, and we to them. Our
2057                                          * ATM address is numerically lower
2058                                          * than theirs, so we make connection
2059                                          * we formed into default VCC (8.1.11).
2060                                          * Connection they made gets torn
2061                                          * down. This might confuse some
2062                                          * clients. Can be changed if
2063                                          * someone reports trouble...
2064                                          */
2065                                         ;
2066                                 }
2067                         }
2068                 }
2069         }
2070         if (found_entry) {
2071                 pr_debug("After vcc was added\n");
2072                 dump_arp_table(priv);
2073                 goto out;
2074         }
2075         /*
2076          * Not found, snatch address from first data packet that arrives
2077          * from this vcc
2078          */
2079         entry = make_entry(priv, bus_mac);
2080         if (!entry)
2081                 goto out;
2082         entry->vcc = vcc;
2083         entry->old_push = old_push;
2084         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2085         eth_zero_addr(entry->mac_addr);
2086         entry->status = ESI_UNKNOWN;
2087         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2088         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2089         entry->timer.function = lec_arp_expire_vcc;
2090         add_timer(&entry->timer);
2091         pr_debug("After vcc was added\n");
2092         dump_arp_table(priv);
2093 out:
2094         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2095 }
2096
2097 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2098 {
2099         unsigned long flags;
2100         struct lec_arp_table *entry;
2101         int i;
2102
2103         pr_debug("%lx\n", tran_id);
2104 restart:
2105         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2106         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2107                 hlist_for_each_entry(entry,
2108                                      &priv->lec_arp_tables[i], next) {
2109                         if (entry->flush_tran_id == tran_id &&
2110                             entry->status == ESI_FLUSH_PENDING) {
2111                                 struct sk_buff *skb;
2112                                 struct atm_vcc *vcc = entry->vcc;
2113
2114                                 lec_arp_hold(entry);
2115                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2116                                                        flags);
2117                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2118                                         lec_send(vcc, skb);
2119                                 entry->last_used = jiffies;
2120                                 entry->status = ESI_FORWARD_DIRECT;
2121                                 lec_arp_put(entry);
2122                                 pr_debug("LEC_ARP: Flushed\n");
2123                                 goto restart;
2124                         }
2125                 }
2126         }
2127         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2128         dump_arp_table(priv);
2129 }
2130
2131 static void
2132 lec_set_flush_tran_id(struct lec_priv *priv,
2133                       const unsigned char *atm_addr, unsigned long tran_id)
2134 {
2135         unsigned long flags;
2136         struct lec_arp_table *entry;
2137         int i;
2138
2139         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2140         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2141                 hlist_for_each_entry(entry,
2142                                      &priv->lec_arp_tables[i], next) {
2143                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2144                                 entry->flush_tran_id = tran_id;
2145                                 pr_debug("Set flush transaction id to %lx for %p\n",
2146                                          tran_id, entry);
2147                         }
2148                 }
2149         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2150 }
2151
2152 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2153 {
2154         unsigned long flags;
2155         unsigned char mac_addr[] = {
2156                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2157         };
2158         struct lec_arp_table *to_add;
2159         struct lec_vcc_priv *vpriv;
2160         int err = 0;
2161
2162         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2163         if (!vpriv)
2164                 return -ENOMEM;
2165         vpriv->xoff = 0;
2166         vpriv->old_pop = vcc->pop;
2167         vcc->user_back = vpriv;
2168         vcc->pop = lec_pop;
2169         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2170         to_add = make_entry(priv, mac_addr);
2171         if (!to_add) {
2172                 vcc->pop = vpriv->old_pop;
2173                 kfree(vpriv);
2174                 err = -ENOMEM;
2175                 goto out;
2176         }
2177         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2178         to_add->status = ESI_FORWARD_DIRECT;
2179         to_add->flags |= LEC_PERMANENT_FLAG;
2180         to_add->vcc = vcc;
2181         to_add->old_push = vcc->push;
2182         vcc->push = lec_push;
2183         priv->mcast_vcc = vcc;
2184         lec_arp_add(priv, to_add);
2185 out:
2186         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2187         return err;
2188 }
2189
2190 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2191 {
2192         unsigned long flags;
2193         struct hlist_node *next;
2194         struct lec_arp_table *entry;
2195         int i;
2196
2197         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2198         dump_arp_table(priv);
2199
2200         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2201
2202         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2203                 hlist_for_each_entry_safe(entry, next,
2204                                           &priv->lec_arp_tables[i], next) {
2205                         if (vcc == entry->vcc) {
2206                                 lec_arp_remove(priv, entry);
2207                                 lec_arp_put(entry);
2208                                 if (priv->mcast_vcc == vcc)
2209                                         priv->mcast_vcc = NULL;
2210                         }
2211                 }
2212         }
2213
2214         hlist_for_each_entry_safe(entry, next,
2215                                   &priv->lec_arp_empty_ones, next) {
2216                 if (entry->vcc == vcc) {
2217                         lec_arp_clear_vccs(entry);
2218                         del_timer(&entry->timer);
2219                         hlist_del(&entry->next);
2220                         lec_arp_put(entry);
2221                 }
2222         }
2223
2224         hlist_for_each_entry_safe(entry, next,
2225                                   &priv->lec_no_forward, next) {
2226                 if (entry->recv_vcc == vcc) {
2227                         lec_arp_clear_vccs(entry);
2228                         del_timer(&entry->timer);
2229                         hlist_del(&entry->next);
2230                         lec_arp_put(entry);
2231                 }
2232         }
2233
2234         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2235                 if (entry->recv_vcc == vcc) {
2236                         lec_arp_clear_vccs(entry);
2237                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2238                         hlist_del(&entry->next);
2239                         lec_arp_put(entry);
2240                 }
2241         }
2242
2243         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2244         dump_arp_table(priv);
2245 }
2246
2247 static void
2248 lec_arp_check_empties(struct lec_priv *priv,
2249                       struct atm_vcc *vcc, struct sk_buff *skb)
2250 {
2251         unsigned long flags;
2252         struct hlist_node *next;
2253         struct lec_arp_table *entry, *tmp;
2254         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2255         unsigned char *src = hdr->h_source;
2256
2257         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2258         hlist_for_each_entry_safe(entry, next,
2259                                   &priv->lec_arp_empty_ones, next) {
2260                 if (vcc == entry->vcc) {
2261                         del_timer(&entry->timer);
2262                         ether_addr_copy(entry->mac_addr, src);
2263                         entry->status = ESI_FORWARD_DIRECT;
2264                         entry->last_used = jiffies;
2265                         /* We might have got an entry */
2266                         tmp = lec_arp_find(priv, src);
2267                         if (tmp) {
2268                                 lec_arp_remove(priv, tmp);
2269                                 lec_arp_put(tmp);
2270                         }
2271                         hlist_del(&entry->next);
2272                         lec_arp_add(priv, entry);
2273                         goto out;
2274                 }
2275         }
2276         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2277 out:
2278         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2279 }
2280
2281 MODULE_LICENSE("GPL");