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