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                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 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         tmp = container_of(e, struct lec_arp_table, next);
 846
 847         hlist_for_each_entry_from(tmp, next) {
 848                 if (--*l < 0)
 849                         break;
 850         }
 851         state->node = e;
 852
 853         return (*l < 0) ? state : NULL;
 854 }
 855
 856 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 857                           struct lec_priv *priv)
 858 {
 859         void *v = NULL;
 860         int p;
 861
 862         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 863                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 864                 if (v)
 865                         break;
 866         }
 867         state->arp_table = p;
 868         return v;
 869 }
 870
 871 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 872                            struct lec_priv *priv)
 873 {
 874         struct hlist_head *lec_misc_tables[] = {
 875                 &priv->lec_arp_empty_ones,
 876                 &priv->lec_no_forward,
 877                 &priv->mcast_fwds
 878         };
 879         void *v = NULL;
 880         int q;
 881
 882         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 883                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 884                 if (v)
 885                         break;
 886         }
 887         state->misc_table = q;
 888         return v;
 889 }
 890
 891 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 892                            struct lec_priv *priv)
 893 {
 894         if (!state->locked) {
 895                 state->locked = priv;
 896                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 897         }
 898         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 899                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 900                 state->locked = NULL;
 901                 /* Partial state reset for the next time we get called */
 902                 state->arp_table = state->misc_table = 0;
 903         }
 904         return state->locked;
 905 }
 906
 907 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 908 {
 909         struct net_device *dev;
 910         void *v;
 911
 912         dev = state->dev ? state->dev : dev_lec[state->itf];
 913         v = (dev && netdev_priv(dev)) ?
 914                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 915         if (!v && dev) {
 916                 dev_put(dev);
 917                 /* Partial state reset for the next time we get called */
 918                 dev = NULL;
 919         }
 920         state->dev = dev;
 921         return v;
 922 }
 923
 924 static void *lec_get_idx(struct lec_state *state, loff_t l)
 925 {
 926         void *v = NULL;
 927
 928         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 929                 v = lec_itf_walk(state, &l);
 930                 if (v)
 931                         break;
 932         }
 933         return v;
 934 }
 935
 936 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 937 {
 938         struct lec_state *state = seq->private;
 939
 940         state->itf = 0;
 941         state->dev = NULL;
 942         state->locked = NULL;
 943         state->arp_table = 0;
 944         state->misc_table = 0;
 945         state->node = SEQ_START_TOKEN;
 946
 947         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 948 }
 949
 950 static void lec_seq_stop(struct seq_file *seq, void *v)
 951 {
 952         struct lec_state *state = seq->private;
 953
 954         if (state->dev) {
 955                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 956                                        state->flags);
 957                 dev_put(state->dev);
 958         }
 959 }
 960
 961 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 962 {
 963         struct lec_state *state = seq->private;
 964
 965         v = lec_get_idx(state, 1);
 966         *pos += !!PTR_ERR(v);
 967         return v;
 968 }
 969
 970 static int lec_seq_show(struct seq_file *seq, void *v)
 971 {
 972         static const char lec_banner[] =
 973             "Itf  MAC          ATM destination"
 974             "                          Status            Flags "
 975             "VPI/VCI Recv VPI/VCI\n";
 976
 977         if (v == SEQ_START_TOKEN)
 978                 seq_puts(seq, lec_banner);
 979         else {
 980                 struct lec_state *state = seq->private;
 981                 struct net_device *dev = state->dev;
 982                 struct lec_arp_table *entry = hlist_entry(state->node,
 983                                                           struct lec_arp_table,
 984                                                           next);
 985
 986                 seq_printf(seq, "%s ", dev->name);
 987                 lec_info(seq, entry);
 988         }
 989         return 0;
 990 }
 991
 992 static const struct seq_operations lec_seq_ops = {
 993         .start = lec_seq_start,
 994         .next = lec_seq_next,
 995         .stop = lec_seq_stop,
 996         .show = lec_seq_show,
 997 };
 998
 999 static int lec_seq_open(struct inode *inode, struct file *file)
1000 {
1001         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1002 }
1003
1004 static const struct file_operations lec_seq_fops = {
1005         .owner = THIS_MODULE,
1006         .open = lec_seq_open,
1007         .read = seq_read,
1008         .llseek = seq_lseek,
1009         .release = seq_release_private,
1010 };
1011 #endif
1012
1013 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1014 {
1015         struct atm_vcc *vcc = ATM_SD(sock);
1016         int err = 0;
1017
1018         switch (cmd) {
1019         case ATMLEC_CTRL:
1020         case ATMLEC_MCAST:
1021         case ATMLEC_DATA:
1022                 if (!capable(CAP_NET_ADMIN))
1023                         return -EPERM;
1024                 break;
1025         default:
1026                 return -ENOIOCTLCMD;
1027         }
1028
1029         switch (cmd) {
1030         case ATMLEC_CTRL:
1031                 err = lecd_attach(vcc, (int)arg);
1032                 if (err >= 0)
1033                         sock->state = SS_CONNECTED;
1034                 break;
1035         case ATMLEC_MCAST:
1036                 err = lec_mcast_attach(vcc, (int)arg);
1037                 break;
1038         case ATMLEC_DATA:
1039                 err = lec_vcc_attach(vcc, (void __user *)arg);
1040                 break;
1041         }
1042
1043         return err;
1044 }
1045
1046 static struct atm_ioctl lane_ioctl_ops = {
1047         .owner = THIS_MODULE,
1048         .ioctl = lane_ioctl,
1049 };
1050
1051 static int __init lane_module_init(void)
1052 {
1053 #ifdef CONFIG_PROC_FS
1054         struct proc_dir_entry *p;
1055
1056         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1057         if (!p) {
1058                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1059                 return -ENOMEM;
1060         }
1061 #endif
1062
1063         register_atm_ioctl(&lane_ioctl_ops);
1064         pr_info("lec.c: initialized\n");
1065         return 0;
1066 }
1067
1068 static void __exit lane_module_cleanup(void)
1069 {
1070         int i;
1071
1072         remove_proc_entry("lec", atm_proc_root);
1073
1074         deregister_atm_ioctl(&lane_ioctl_ops);
1075
1076         for (i = 0; i < MAX_LEC_ITF; i++) {
1077                 if (dev_lec[i] != NULL) {
1078                         unregister_netdev(dev_lec[i]);
1079                         free_netdev(dev_lec[i]);
1080                         dev_lec[i] = NULL;
1081                 }
1082         }
1083 }
1084
1085 module_init(lane_module_init);
1086 module_exit(lane_module_cleanup);
1087
1088 /*
1089  * LANE2: 3.1.3, LE_RESOLVE.request
1090  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1091  * If sizeoftlvs == NULL the default TLVs associated with with this
1092  * lec will be used.
1093  * If dst_mac == NULL, targetless LE_ARP will be sent
1094  */
1095 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1096                          u8 **tlvs, u32 *sizeoftlvs)
1097 {
1098         unsigned long flags;
1099         struct lec_priv *priv = netdev_priv(dev);
1100         struct lec_arp_table *table;
1101         struct sk_buff *skb;
1102         int retval;
1103
1104         if (force == 0) {
1105                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1106                 table = lec_arp_find(priv, dst_mac);
1107                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1108                 if (table == NULL)
1109                         return -1;
1110
1111                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1112                 if (*tlvs == NULL)
1113                         return -1;
1114
1115                 *sizeoftlvs = table->sizeoftlvs;
1116
1117                 return 0;
1118         }
1119
1120         if (sizeoftlvs == NULL)
1121                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1122
1123         else {
1124                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1125                 if (skb == NULL)
1126                         return -1;
1127                 skb->len = *sizeoftlvs;
1128                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1129                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1130         }
1131         return retval;
1132 }
1133
1134 /*
1135  * LANE2: 3.1.4, LE_ASSOCIATE.request
1136  * Associate the *tlvs with the *lan_dst address.
1137  * Will overwrite any previous association
1138  * Returns 1 for success, 0 for failure (out of memory)
1139  *
1140  */
1141 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1142                                const u8 *tlvs, u32 sizeoftlvs)
1143 {
1144         int retval;
1145         struct sk_buff *skb;
1146         struct lec_priv *priv = netdev_priv(dev);
1147
1148         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1149                 return 0;       /* not our mac address */
1150
1151         kfree(priv->tlvs);      /* NULL if there was no previous association */
1152
1153         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1154         if (priv->tlvs == NULL)
1155                 return 0;
1156         priv->sizeoftlvs = sizeoftlvs;
1157
1158         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1159         if (skb == NULL)
1160                 return 0;
1161         skb->len = sizeoftlvs;
1162         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1163         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1164         if (retval != 0)
1165                 pr_info("lec.c: lane2_associate_req() failed\n");
1166         /*
1167          * If the previous association has changed we must
1168          * somehow notify other LANE entities about the change
1169          */
1170         return 1;
1171 }
1172
1173 /*
1174  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1175  *
1176  */
1177 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1178                                 const u8 *tlvs, u32 sizeoftlvs)
1179 {
1180 #if 0
1181         int i = 0;
1182 #endif
1183         struct lec_priv *priv = netdev_priv(dev);
1184 #if 0                           /*
1185                                  * Why have the TLVs in LE_ARP entries
1186                                  * since we do not use them? When you
1187                                  * uncomment this code, make sure the
1188                                  * TLVs get freed when entry is killed
1189                                  */
1190         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1191
1192         if (entry == NULL)
1193                 return;         /* should not happen */
1194
1195         kfree(entry->tlvs);
1196
1197         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1198         if (entry->tlvs == NULL)
1199                 return;
1200         entry->sizeoftlvs = sizeoftlvs;
1201 #endif
1202 #if 0
1203         pr_info("\n");
1204         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1205         while (i < sizeoftlvs)
1206                 pr_cont("%02x ", tlvs[i++]);
1207
1208         pr_cont("\n");
1209 #endif
1210
1211         /* tell MPOA about the TLVs we saw */
1212         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1213                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1214                                                      tlvs, sizeoftlvs);
1215         }
1216 }
1217
1218 /*
1219  * Here starts what used to lec_arpc.c
1220  *
1221  * lec_arpc.c was added here when making
1222  * lane client modular. October 1997
1223  */
1224
1225 #include <linux/types.h>
1226 #include <linux/timer.h>
1227 #include <linux/param.h>
1228 #include <linux/atomic.h>
1229 #include <linux/inetdevice.h>
1230 #include <net/route.h>
1231
1232 #if 0
1233 #define pr_debug(format, args...)
1234 /*
1235   #define pr_debug printk
1236 */
1237 #endif
1238 #define DEBUG_ARP_TABLE 0
1239
1240 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1241
1242 static void lec_arp_check_expire(struct work_struct *work);
1243 static void lec_arp_expire_arp(unsigned long data);
1244
1245 /*
1246  * Arp table funcs
1247  */
1248
1249 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1250
1251 /*
1252  * Initialization of arp-cache
1253  */
1254 static void lec_arp_init(struct lec_priv *priv)
1255 {
1256         unsigned short i;
1257
1258         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1259                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1260         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1261         INIT_HLIST_HEAD(&priv->lec_no_forward);
1262         INIT_HLIST_HEAD(&priv->mcast_fwds);
1263         spin_lock_init(&priv->lec_arp_lock);
1264         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1265         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1266 }
1267
1268 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1269 {
1270         if (entry->vcc) {
1271                 struct atm_vcc *vcc = entry->vcc;
1272                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1273                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1274
1275                 vcc->pop = vpriv->old_pop;
1276                 if (vpriv->xoff)
1277                         netif_wake_queue(dev);
1278                 kfree(vpriv);
1279                 vcc->user_back = NULL;
1280                 vcc->push = entry->old_push;
1281                 vcc_release_async(vcc, -EPIPE);
1282                 entry->vcc = NULL;
1283         }
1284         if (entry->recv_vcc) {
1285                 entry->recv_vcc->push = entry->old_recv_push;
1286                 vcc_release_async(entry->recv_vcc, -EPIPE);
1287                 entry->recv_vcc = NULL;
1288         }
1289 }
1290
1291 /*
1292  * Insert entry to lec_arp_table
1293  * LANE2: Add to the end of the list to satisfy 8.1.13
1294  */
1295 static inline void
1296 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1297 {
1298         struct hlist_head *tmp;
1299
1300         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1301         hlist_add_head(&entry->next, tmp);
1302
1303         pr_debug("Added entry:%pM\n", entry->mac_addr);
1304 }
1305
1306 /*
1307  * Remove entry from lec_arp_table
1308  */
1309 static int
1310 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1311 {
1312         struct lec_arp_table *entry;
1313         int i, remove_vcc = 1;
1314
1315         if (!to_remove)
1316                 return -1;
1317
1318         hlist_del(&to_remove->next);
1319         del_timer(&to_remove->timer);
1320
1321         /*
1322          * If this is the only MAC connected to this VCC,
1323          * also tear down the VCC
1324          */
1325         if (to_remove->status >= ESI_FLUSH_PENDING) {
1326                 /*
1327                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1328                  */
1329                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1330                         hlist_for_each_entry(entry,
1331                                              &priv->lec_arp_tables[i], next) {
1332                                 if (memcmp(to_remove->atm_addr,
1333                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1334                                         remove_vcc = 0;
1335                                         break;
1336                                 }
1337                         }
1338                 }
1339                 if (remove_vcc)
1340                         lec_arp_clear_vccs(to_remove);
1341         }
1342         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1343
1344         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1345         return 0;
1346 }
1347
1348 #if DEBUG_ARP_TABLE
1349 static const char *get_status_string(unsigned char st)
1350 {
1351         switch (st) {
1352         case ESI_UNKNOWN:
1353                 return "ESI_UNKNOWN";
1354         case ESI_ARP_PENDING:
1355                 return "ESI_ARP_PENDING";
1356         case ESI_VC_PENDING:
1357                 return "ESI_VC_PENDING";
1358         case ESI_FLUSH_PENDING:
1359                 return "ESI_FLUSH_PENDING";
1360         case ESI_FORWARD_DIRECT:
1361                 return "ESI_FORWARD_DIRECT";
1362         }
1363         return "<UNKNOWN>";
1364 }
1365
1366 static void dump_arp_table(struct lec_priv *priv)
1367 {
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,
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, &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, &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, &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 *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, 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, 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, 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, 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_head *head;
1546         struct lec_arp_table *entry;
1547
1548         pr_debug("%pM\n", mac_addr);
1549
1550         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1551         hlist_for_each_entry(entry, head, next) {
1552                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1553                         return entry;
1554         }
1555         return NULL;
1556 }
1557
1558 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1559                                         const unsigned char *mac_addr)
1560 {
1561         struct lec_arp_table *to_return;
1562
1563         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1564         if (!to_return) {
1565                 pr_info("LEC: Arp entry kmalloc failed\n");
1566                 return NULL;
1567         }
1568         ether_addr_copy(to_return->mac_addr, mac_addr);
1569         INIT_HLIST_NODE(&to_return->next);
1570         setup_timer(&to_return->timer, lec_arp_expire_arp,
1571                         (unsigned long)to_return);
1572         to_return->last_used = jiffies;
1573         to_return->priv = priv;
1574         skb_queue_head_init(&to_return->tx_wait);
1575         atomic_set(&to_return->usage, 1);
1576         return to_return;
1577 }
1578
1579 /* Arp sent timer expired */
1580 static void lec_arp_expire_arp(unsigned long data)
1581 {
1582         struct lec_arp_table *entry;
1583
1584         entry = (struct lec_arp_table *)data;
1585
1586         pr_debug("\n");
1587         if (entry->status == ESI_ARP_PENDING) {
1588                 if (entry->no_tries <= entry->priv->max_retry_count) {
1589                         if (entry->is_rdesc)
1590                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1591                                              entry->mac_addr, NULL, NULL);
1592                         else
1593                                 send_to_lecd(entry->priv, l_arp_xmt,
1594                                              entry->mac_addr, NULL, NULL);
1595                         entry->no_tries++;
1596                 }
1597                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1598         }
1599 }
1600
1601 /* Unknown/unused vcc expire, remove associated entry */
1602 static void lec_arp_expire_vcc(unsigned long data)
1603 {
1604         unsigned long flags;
1605         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1606         struct lec_priv *priv = to_remove->priv;
1607
1608         del_timer(&to_remove->timer);
1609
1610         pr_debug("%p %p: vpi:%d vci:%d\n",
1611                  to_remove, priv,
1612                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1613                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1614
1615         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1616         hlist_del(&to_remove->next);
1617         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1618
1619         lec_arp_clear_vccs(to_remove);
1620         lec_arp_put(to_remove);
1621 }
1622
1623 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1624                                    unsigned long now,
1625                                    struct lec_priv *priv)
1626 {
1627         unsigned long time_to_check;
1628
1629         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1630                 time_to_check = priv->forward_delay_time;
1631         else
1632                 time_to_check = priv->aging_time;
1633
1634         pr_debug("About to expire: %lx - %lx > %lx\n",
1635                  now, entry->last_used, time_to_check);
1636         if (time_after(now, entry->last_used + time_to_check) &&
1637             !(entry->flags & LEC_PERMANENT_FLAG) &&
1638             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1639                 /* Remove entry */
1640                 pr_debug("Entry timed out\n");
1641                 lec_arp_remove(priv, entry);
1642                 lec_arp_put(entry);
1643         } else {
1644                 /* Something else */
1645                 if ((entry->status == ESI_VC_PENDING ||
1646                      entry->status == ESI_ARP_PENDING) &&
1647                     time_after_eq(now, entry->timestamp +
1648                                        priv->max_unknown_frame_time)) {
1649                         entry->timestamp = jiffies;
1650                         entry->packets_flooded = 0;
1651                         if (entry->status == ESI_VC_PENDING)
1652                                 send_to_lecd(priv, l_svc_setup,
1653                                              entry->mac_addr,
1654                                              entry->atm_addr,
1655                                              NULL);
1656                 }
1657                 if (entry->status == ESI_FLUSH_PENDING &&
1658                     time_after_eq(now, entry->timestamp +
1659                                        priv->path_switching_delay)) {
1660                         lec_arp_hold(entry);
1661                         return true;
1662                 }
1663         }
1664
1665         return false;
1666 }
1667 /*
1668  * Expire entries.
1669  * 1. Re-set timer
1670  * 2. For each entry, delete entries that have aged past the age limit.
1671  * 3. For each entry, depending on the status of the entry, perform
1672  *    the following maintenance.
1673  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1674  *       tick_count is above the max_unknown_frame_time, clear
1675  *       the tick_count to zero and clear the packets_flooded counter
1676  *       to zero. This supports the packet rate limit per address
1677  *       while flooding unknowns.
1678  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1679  *       than or equal to the path_switching_delay, change the status
1680  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1681  *       regardless of the progress of the flush protocol.
1682  */
1683 static void lec_arp_check_expire(struct work_struct *work)
1684 {
1685         unsigned long flags;
1686         struct lec_priv *priv =
1687                 container_of(work, struct lec_priv, lec_arp_work.work);
1688         struct hlist_node *next;
1689         struct lec_arp_table *entry;
1690         unsigned long now;
1691         int i;
1692
1693         pr_debug("%p\n", priv);
1694         now = jiffies;
1695 restart:
1696         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1697         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1698                 hlist_for_each_entry_safe(entry, next,
1699                                           &priv->lec_arp_tables[i], next) {
1700                         if (__lec_arp_check_expire(entry, now, priv)) {
1701                                 struct sk_buff *skb;
1702                                 struct atm_vcc *vcc = entry->vcc;
1703
1704                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1705                                                        flags);
1706                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1707                                         lec_send(vcc, skb);
1708                                 entry->last_used = jiffies;
1709                                 entry->status = ESI_FORWARD_DIRECT;
1710                                 lec_arp_put(entry);
1711
1712                                 goto restart;
1713                         }
1714                 }
1715         }
1716         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1717
1718         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1719 }
1720
1721 /*
1722  * Try to find vcc where mac_address is attached.
1723  *
1724  */
1725 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1726                                        const unsigned char *mac_to_find,
1727                                        int is_rdesc,
1728                                        struct lec_arp_table **ret_entry)
1729 {
1730         unsigned long flags;
1731         struct lec_arp_table *entry;
1732         struct atm_vcc *found;
1733
1734         if (mac_to_find[0] & 0x01) {
1735                 switch (priv->lane_version) {
1736                 case 1:
1737                         return priv->mcast_vcc;
1738                 case 2: /* LANE2 wants arp for multicast addresses */
1739                         if (ether_addr_equal(mac_to_find, bus_mac))
1740                                 return priv->mcast_vcc;
1741                         break;
1742                 default:
1743                         break;
1744                 }
1745         }
1746
1747         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1748         entry = lec_arp_find(priv, mac_to_find);
1749
1750         if (entry) {
1751                 if (entry->status == ESI_FORWARD_DIRECT) {
1752                         /* Connection Ok */
1753                         entry->last_used = jiffies;
1754                         lec_arp_hold(entry);
1755                         *ret_entry = entry;
1756                         found = entry->vcc;
1757                         goto out;
1758                 }
1759                 /*
1760                  * If the LE_ARP cache entry is still pending, reset count to 0
1761                  * so another LE_ARP request can be made for this frame.
1762                  */
1763                 if (entry->status == ESI_ARP_PENDING)
1764                         entry->no_tries = 0;
1765                 /*
1766                  * Data direct VC not yet set up, check to see if the unknown
1767                  * frame count is greater than the limit. If the limit has
1768                  * not been reached, allow the caller to send packet to
1769                  * BUS.
1770                  */
1771                 if (entry->status != ESI_FLUSH_PENDING &&
1772                     entry->packets_flooded <
1773                     priv->maximum_unknown_frame_count) {
1774                         entry->packets_flooded++;
1775                         pr_debug("Flooding..\n");
1776                         found = priv->mcast_vcc;
1777                         goto out;
1778                 }
1779                 /*
1780                  * We got here because entry->status == ESI_FLUSH_PENDING
1781                  * or BUS flood limit was reached for an entry which is
1782                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1783                  */
1784                 lec_arp_hold(entry);
1785                 *ret_entry = entry;
1786                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1787                          entry->vcc);
1788                 found = NULL;
1789         } else {
1790                 /* No matching entry was found */
1791                 entry = make_entry(priv, mac_to_find);
1792                 pr_debug("Making entry\n");
1793                 if (!entry) {
1794                         found = priv->mcast_vcc;
1795                         goto out;
1796                 }
1797                 lec_arp_add(priv, entry);
1798                 /* We want arp-request(s) to be sent */
1799                 entry->packets_flooded = 1;
1800                 entry->status = ESI_ARP_PENDING;
1801                 entry->no_tries = 1;
1802                 entry->last_used = entry->timestamp = jiffies;
1803                 entry->is_rdesc = is_rdesc;
1804                 if (entry->is_rdesc)
1805                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1806                                      NULL);
1807                 else
1808                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1809                 entry->timer.expires = jiffies + (1 * HZ);
1810                 entry->timer.function = lec_arp_expire_arp;
1811                 add_timer(&entry->timer);
1812                 found = priv->mcast_vcc;
1813         }
1814
1815 out:
1816         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1817         return found;
1818 }
1819
1820 static int
1821 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1822                 unsigned long permanent)
1823 {
1824         unsigned long flags;
1825         struct hlist_node *next;
1826         struct lec_arp_table *entry;
1827         int i;
1828
1829         pr_debug("\n");
1830         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1831         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1832                 hlist_for_each_entry_safe(entry, next,
1833                                           &priv->lec_arp_tables[i], next) {
1834                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1835                             (permanent ||
1836                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1837                                 lec_arp_remove(priv, entry);
1838                                 lec_arp_put(entry);
1839                         }
1840                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1841                         return 0;
1842                 }
1843         }
1844         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1845         return -1;
1846 }
1847
1848 /*
1849  * Notifies:  Response to arp_request (atm_addr != NULL)
1850  */
1851 static void
1852 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1853                const unsigned char *atm_addr, unsigned long remoteflag,
1854                unsigned int targetless_le_arp)
1855 {
1856         unsigned long flags;
1857         struct hlist_node *next;
1858         struct lec_arp_table *entry, *tmp;
1859         int i;
1860
1861         pr_debug("%smac:%pM\n",
1862                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1863
1864         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1865         entry = lec_arp_find(priv, mac_addr);
1866         if (entry == NULL && targetless_le_arp)
1867                 goto out;       /*
1868                                  * LANE2: ignore targetless LE_ARPs for which
1869                                  * we have no entry in the cache. 7.1.30
1870                                  */
1871         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1872                 hlist_for_each_entry_safe(entry, next,
1873                                           &priv->lec_arp_empty_ones, next) {
1874                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1875                                 hlist_del(&entry->next);
1876                                 del_timer(&entry->timer);
1877                                 tmp = lec_arp_find(priv, mac_addr);
1878                                 if (tmp) {
1879                                         del_timer(&tmp->timer);
1880                                         tmp->status = ESI_FORWARD_DIRECT;
1881                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1882                                         tmp->vcc = entry->vcc;
1883                                         tmp->old_push = entry->old_push;
1884                                         tmp->last_used = jiffies;
1885                                         del_timer(&entry->timer);
1886                                         lec_arp_put(entry);
1887                                         entry = tmp;
1888                                 } else {
1889                                         entry->status = ESI_FORWARD_DIRECT;
1890                                         ether_addr_copy(entry->mac_addr,
1891                                                         mac_addr);
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,
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 lec_arp_table *entry;
1960         int i, found_entry = 0;
1961
1962         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1963         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1964         if (ioc_data->receive == 2) {
1965                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1966 #if 0
1967                 entry = lec_arp_find(priv, bus_mac);
1968                 if (!entry) {
1969                         pr_info("LEC_ARP: Multicast entry not found!\n");
1970                         goto out;
1971                 }
1972                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1973                 entry->recv_vcc = vcc;
1974                 entry->old_recv_push = old_push;
1975 #endif
1976                 entry = make_entry(priv, bus_mac);
1977                 if (entry == NULL)
1978                         goto out;
1979                 del_timer(&entry->timer);
1980                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1981                 entry->recv_vcc = vcc;
1982                 entry->old_recv_push = old_push;
1983                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1984                 goto out;
1985         } else if (ioc_data->receive == 1) {
1986                 /*
1987                  * Vcc which we don't want to make default vcc,
1988                  * attach it anyway.
1989                  */
1990                 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",
1991                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1992                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1993                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1994                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1995                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1996                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1997                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1998                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1999                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2000                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2001                 entry = make_entry(priv, bus_mac);
2002                 if (entry == NULL)
2003                         goto out;
2004                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2005                 memset(entry->mac_addr, 0, ETH_ALEN);
2006                 entry->recv_vcc = vcc;
2007                 entry->old_recv_push = old_push;
2008                 entry->status = ESI_UNKNOWN;
2009                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2010                 entry->timer.function = lec_arp_expire_vcc;
2011                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2012                 add_timer(&entry->timer);
2013                 dump_arp_table(priv);
2014                 goto out;
2015         }
2016         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",
2017                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2018                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2019                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2020                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2021                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2022                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2023                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2024                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2025                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2026                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2027         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2028                 hlist_for_each_entry(entry,
2029                                      &priv->lec_arp_tables[i], next) {
2030                         if (memcmp
2031                             (ioc_data->atm_addr, entry->atm_addr,
2032                              ATM_ESA_LEN) == 0) {
2033                                 pr_debug("LEC_ARP: Attaching data direct\n");
2034                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2035                                          entry->vcc ? entry->vcc->vci : 0,
2036                                          entry->recv_vcc ? entry->recv_vcc->
2037                                          vci : 0);
2038                                 found_entry = 1;
2039                                 del_timer(&entry->timer);
2040                                 entry->vcc = vcc;
2041                                 entry->old_push = old_push;
2042                                 if (entry->status == ESI_VC_PENDING) {
2043                                         if (priv->maximum_unknown_frame_count
2044                                             == 0)
2045                                                 entry->status =
2046                                                     ESI_FORWARD_DIRECT;
2047                                         else {
2048                                                 entry->timestamp = jiffies;
2049                                                 entry->status =
2050                                                     ESI_FLUSH_PENDING;
2051 #if 0
2052                                                 send_to_lecd(priv, l_flush_xmt,
2053                                                              NULL,
2054                                                              entry->atm_addr,
2055                                                              NULL);
2056 #endif
2057                                         }
2058                                 } else {
2059                                         /*
2060                                          * They were forming a connection
2061                                          * to us, and we to them. Our
2062                                          * ATM address is numerically lower
2063                                          * than theirs, so we make connection
2064                                          * we formed into default VCC (8.1.11).
2065                                          * Connection they made gets torn
2066                                          * down. This might confuse some
2067                                          * clients. Can be changed if
2068                                          * someone reports trouble...
2069                                          */
2070                                         ;
2071                                 }
2072                         }
2073                 }
2074         }
2075         if (found_entry) {
2076                 pr_debug("After vcc was added\n");
2077                 dump_arp_table(priv);
2078                 goto out;
2079         }
2080         /*
2081          * Not found, snatch address from first data packet that arrives
2082          * from this vcc
2083          */
2084         entry = make_entry(priv, bus_mac);
2085         if (!entry)
2086                 goto out;
2087         entry->vcc = vcc;
2088         entry->old_push = old_push;
2089         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2090         memset(entry->mac_addr, 0, ETH_ALEN);
2091         entry->status = ESI_UNKNOWN;
2092         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2093         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2094         entry->timer.function = lec_arp_expire_vcc;
2095         add_timer(&entry->timer);
2096         pr_debug("After vcc was added\n");
2097         dump_arp_table(priv);
2098 out:
2099         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2100 }
2101
2102 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2103 {
2104         unsigned long flags;
2105         struct lec_arp_table *entry;
2106         int i;
2107
2108         pr_debug("%lx\n", tran_id);
2109 restart:
2110         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2111         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2112                 hlist_for_each_entry(entry,
2113                                      &priv->lec_arp_tables[i], next) {
2114                         if (entry->flush_tran_id == tran_id &&
2115                             entry->status == ESI_FLUSH_PENDING) {
2116                                 struct sk_buff *skb;
2117                                 struct atm_vcc *vcc = entry->vcc;
2118
2119                                 lec_arp_hold(entry);
2120                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2121                                                        flags);
2122                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2123                                         lec_send(vcc, skb);
2124                                 entry->last_used = jiffies;
2125                                 entry->status = ESI_FORWARD_DIRECT;
2126                                 lec_arp_put(entry);
2127                                 pr_debug("LEC_ARP: Flushed\n");
2128                                 goto restart;
2129                         }
2130                 }
2131         }
2132         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2133         dump_arp_table(priv);
2134 }
2135
2136 static void
2137 lec_set_flush_tran_id(struct lec_priv *priv,
2138                       const unsigned char *atm_addr, unsigned long tran_id)
2139 {
2140         unsigned long flags;
2141         struct lec_arp_table *entry;
2142         int i;
2143
2144         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2145         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2146                 hlist_for_each_entry(entry,
2147                                      &priv->lec_arp_tables[i], next) {
2148                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2149                                 entry->flush_tran_id = tran_id;
2150                                 pr_debug("Set flush transaction id to %lx for %p\n",
2151                                          tran_id, entry);
2152                         }
2153                 }
2154         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2155 }
2156
2157 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2158 {
2159         unsigned long flags;
2160         unsigned char mac_addr[] = {
2161                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2162         };
2163         struct lec_arp_table *to_add;
2164         struct lec_vcc_priv *vpriv;
2165         int err = 0;
2166
2167         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2168         if (!vpriv)
2169                 return -ENOMEM;
2170         vpriv->xoff = 0;
2171         vpriv->old_pop = vcc->pop;
2172         vcc->user_back = vpriv;
2173         vcc->pop = lec_pop;
2174         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2175         to_add = make_entry(priv, mac_addr);
2176         if (!to_add) {
2177                 vcc->pop = vpriv->old_pop;
2178                 kfree(vpriv);
2179                 err = -ENOMEM;
2180                 goto out;
2181         }
2182         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2183         to_add->status = ESI_FORWARD_DIRECT;
2184         to_add->flags |= LEC_PERMANENT_FLAG;
2185         to_add->vcc = vcc;
2186         to_add->old_push = vcc->push;
2187         vcc->push = lec_push;
2188         priv->mcast_vcc = vcc;
2189         lec_arp_add(priv, to_add);
2190 out:
2191         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2192         return err;
2193 }
2194
2195 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2196 {
2197         unsigned long flags;
2198         struct hlist_node *next;
2199         struct lec_arp_table *entry;
2200         int i;
2201
2202         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2203         dump_arp_table(priv);
2204
2205         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2206
2207         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2208                 hlist_for_each_entry_safe(entry, next,
2209                                           &priv->lec_arp_tables[i], next) {
2210                         if (vcc == entry->vcc) {
2211                                 lec_arp_remove(priv, entry);
2212                                 lec_arp_put(entry);
2213                                 if (priv->mcast_vcc == vcc)
2214                                         priv->mcast_vcc = NULL;
2215                         }
2216                 }
2217         }
2218
2219         hlist_for_each_entry_safe(entry, next,
2220                                   &priv->lec_arp_empty_ones, next) {
2221                 if (entry->vcc == vcc) {
2222                         lec_arp_clear_vccs(entry);
2223                         del_timer(&entry->timer);
2224                         hlist_del(&entry->next);
2225                         lec_arp_put(entry);
2226                 }
2227         }
2228
2229         hlist_for_each_entry_safe(entry, next,
2230                                   &priv->lec_no_forward, next) {
2231                 if (entry->recv_vcc == vcc) {
2232                         lec_arp_clear_vccs(entry);
2233                         del_timer(&entry->timer);
2234                         hlist_del(&entry->next);
2235                         lec_arp_put(entry);
2236                 }
2237         }
2238
2239         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2240                 if (entry->recv_vcc == vcc) {
2241                         lec_arp_clear_vccs(entry);
2242                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2243                         hlist_del(&entry->next);
2244                         lec_arp_put(entry);
2245                 }
2246         }
2247
2248         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2249         dump_arp_table(priv);
2250 }
2251
2252 static void
2253 lec_arp_check_empties(struct lec_priv *priv,
2254                       struct atm_vcc *vcc, struct sk_buff *skb)
2255 {
2256         unsigned long flags;
2257         struct hlist_node *next;
2258         struct lec_arp_table *entry, *tmp;
2259         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2260         unsigned char *src = hdr->h_source;
2261
2262         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2263         hlist_for_each_entry_safe(entry, next,
2264                                   &priv->lec_arp_empty_ones, next) {
2265                 if (vcc == entry->vcc) {
2266                         del_timer(&entry->timer);
2267                         ether_addr_copy(entry->mac_addr, src);
2268                         entry->status = ESI_FORWARD_DIRECT;
2269                         entry->last_used = jiffies;
2270                         /* We might have got an entry */
2271                         tmp = lec_arp_find(priv, src);
2272                         if (tmp) {
2273                                 lec_arp_remove(priv, tmp);
2274                                 lec_arp_put(tmp);
2275                         }
2276                         hlist_del(&entry->next);
2277                         lec_arp_add(priv, entry);
2278                         goto out;
2279                 }
2280         }
2281         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2282 out:
2283         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2284 }
2285
2286 MODULE_LICENSE("GPL");