linux/net/atm/lec.c
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   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
  37static 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
  59static int lec_open(struct net_device *dev);
  60static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  61                                  struct net_device *dev);
  62static int lec_close(struct net_device *dev);
  63static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  64                                          const unsigned char *mac_addr);
  65static int lec_arp_remove(struct lec_priv *priv,
  66                          struct lec_arp_table *to_remove);
  67/* LANE2 functions */
  68static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  69                                const u8 *tlvs, u32 sizeoftlvs);
  70static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  71                         u8 **tlvs, u32 *sizeoftlvs);
  72static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  73                               const u8 *tlvs, u32 sizeoftlvs);
  74
  75static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  76                           unsigned long permanent);
  77static void lec_arp_check_empties(struct lec_priv *priv,
  78                                  struct atm_vcc *vcc, struct sk_buff *skb);
  79static void lec_arp_destroy(struct lec_priv *priv);
  80static void lec_arp_init(struct lec_priv *priv);
  81static 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);
  85static 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);
  89static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  90static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  91static void lec_set_flush_tran_id(struct lec_priv *priv,
  92                                  const unsigned char *atm_addr,
  93                                  unsigned long tran_id);
  94static 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));
  99static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 100
 101/* must be done under lec_arp_lock */
 102static inline void lec_arp_hold(struct lec_arp_table *entry)
 103{
 104        atomic_inc(&entry->usage);
 105}
 106
 107static inline void lec_arp_put(struct lec_arp_table *entry)
 108{
 109        if (atomic_dec_and_test(&entry->usage))
 110                kfree(entry);
 111}
 112
 113static 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
 119static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 120
 121/* Device structures */
 122static struct net_device *dev_lec[MAX_LEC_ITF];
 123
 124#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 125static 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
 169static int lec_open(struct net_device *dev)
 170{
 171        netif_start_queue(dev);
 172
 173        return 0;
 174}
 175
 176static void
 177lec_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
 194static 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
 201static 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
 324out:
 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(). */
 332static int lec_close(struct net_device *dev)
 333{
 334        netif_stop_queue(dev);
 335        return 0;
 336}
 337
 338static 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
 464static 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
 487static struct atmdev_ops lecdev_ops = {
 488        .close = lec_atm_close,
 489        .send = lec_atm_send
 490};
 491
 492static 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 */
 503static int
 504send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 505             const unsigned char *mac_addr, const unsigned char *atm_addr,
 506             struct sk_buff *data)
 507{
 508        struct sock *sk;
 509        struct sk_buff *skb;
 510        struct atmlec_msg *mesg;
 511
 512        if (!priv || !priv->lecd)
 513                return -1;
 514        skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 515        if (!skb)
 516                return -1;
 517        skb->len = sizeof(struct atmlec_msg);
 518        mesg = (struct atmlec_msg *)skb->data;
 519        memset(mesg, 0, sizeof(struct atmlec_msg));
 520        mesg->type = type;
 521        if (data != NULL)
 522                mesg->sizeoftlvs = data->len;
 523        if (mac_addr)
 524                memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 525        else
 526                mesg->content.normal.targetless_le_arp = 1;
 527        if (atm_addr)
 528                memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 529
 530        atm_force_charge(priv->lecd, skb->truesize);
 531        sk = sk_atm(priv->lecd);
 532        skb_queue_tail(&sk->sk_receive_queue, skb);
 533        sk->sk_data_ready(sk, skb->len);
 534
 535        if (data != NULL) {
 536                pr_debug("about to send %d bytes of data\n", data->len);
 537                atm_force_charge(priv->lecd, data->truesize);
 538                skb_queue_tail(&sk->sk_receive_queue, data);
 539                sk->sk_data_ready(sk, skb->len);
 540        }
 541
 542        return 0;
 543}
 544
 545/* shamelessly stolen from drivers/net/net_init.c */
 546static 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
 554static 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
 562static 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
 571static 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
 581static 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
 587static 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
 669static 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
 688static 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
 715static 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. */
 724static 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
 784static 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
 800static 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
 822struct 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
 832static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 833                          loff_t *l)
 834{
 835        struct hlist_node *e = state->node;
 836        struct lec_arp_table *tmp;
 837
 838        if (!e)
 839                e = tbl->first;
 840        if (e == SEQ_START_TOKEN) {
 841                e = tbl->first;
 842                --*l;
 843        }
 844
 845        hlist_for_each_entry_from(tmp, e, next) {
 846                if (--*l < 0)
 847                        break;
 848        }
 849        state->node = e;
 850
 851        return (*l < 0) ? state : NULL;
 852}
 853
 854static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 855                          struct lec_priv *priv)
 856{
 857        void *v = NULL;
 858        int p;
 859
 860        for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 861                v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 862                if (v)
 863                        break;
 864        }
 865        state->arp_table = p;
 866        return v;
 867}
 868
 869static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 870                           struct lec_priv *priv)
 871{
 872        struct hlist_head *lec_misc_tables[] = {
 873                &priv->lec_arp_empty_ones,
 874                &priv->lec_no_forward,
 875                &priv->mcast_fwds
 876        };
 877        void *v = NULL;
 878        int q;
 879
 880        for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 881                v = lec_tbl_walk(state, lec_misc_tables[q], l);
 882                if (v)
 883                        break;
 884        }
 885        state->misc_table = q;
 886        return v;
 887}
 888
 889static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 890                           struct lec_priv *priv)
 891{
 892        if (!state->locked) {
 893                state->locked = priv;
 894                spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 895        }
 896        if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 897                spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 898                state->locked = NULL;
 899                /* Partial state reset for the next time we get called */
 900                state->arp_table = state->misc_table = 0;
 901        }
 902        return state->locked;
 903}
 904
 905static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 906{
 907        struct net_device *dev;
 908        void *v;
 909
 910        dev = state->dev ? state->dev : dev_lec[state->itf];
 911        v = (dev && netdev_priv(dev)) ?
 912                lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 913        if (!v && dev) {
 914                dev_put(dev);
 915                /* Partial state reset for the next time we get called */
 916                dev = NULL;
 917        }
 918        state->dev = dev;
 919        return v;
 920}
 921
 922static void *lec_get_idx(struct lec_state *state, loff_t l)
 923{
 924        void *v = NULL;
 925
 926        for (; state->itf < MAX_LEC_ITF; state->itf++) {
 927                v = lec_itf_walk(state, &l);
 928                if (v)
 929                        break;
 930        }
 931        return v;
 932}
 933
 934static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 935{
 936        struct lec_state *state = seq->private;
 937
 938        state->itf = 0;
 939        state->dev = NULL;
 940        state->locked = NULL;
 941        state->arp_table = 0;
 942        state->misc_table = 0;
 943        state->node = SEQ_START_TOKEN;
 944
 945        return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 946}
 947
 948static void lec_seq_stop(struct seq_file *seq, void *v)
 949{
 950        struct lec_state *state = seq->private;
 951
 952        if (state->dev) {
 953                spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 954                                       state->flags);
 955                dev_put(state->dev);
 956        }
 957}
 958
 959static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 960{
 961        struct lec_state *state = seq->private;
 962
 963        v = lec_get_idx(state, 1);
 964        *pos += !!PTR_ERR(v);
 965        return v;
 966}
 967
 968static int lec_seq_show(struct seq_file *seq, void *v)
 969{
 970        static const char lec_banner[] =
 971            "Itf  MAC          ATM destination"
 972            "                          Status            Flags "
 973            "VPI/VCI Recv VPI/VCI\n";
 974
 975        if (v == SEQ_START_TOKEN)
 976                seq_puts(seq, lec_banner);
 977        else {
 978                struct lec_state *state = seq->private;
 979                struct net_device *dev = state->dev;
 980                struct lec_arp_table *entry = hlist_entry(state->node,
 981                                                          struct lec_arp_table,
 982                                                          next);
 983
 984                seq_printf(seq, "%s ", dev->name);
 985                lec_info(seq, entry);
 986        }
 987        return 0;
 988}
 989
 990static const struct seq_operations lec_seq_ops = {
 991        .start = lec_seq_start,
 992        .next = lec_seq_next,
 993        .stop = lec_seq_stop,
 994        .show = lec_seq_show,
 995};
 996
 997static int lec_seq_open(struct inode *inode, struct file *file)
 998{
 999        return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1000}
1001
1002static const struct file_operations lec_seq_fops = {
1003        .owner = THIS_MODULE,
1004        .open = lec_seq_open,
1005        .read = seq_read,
1006        .llseek = seq_lseek,
1007        .release = seq_release_private,
1008};
1009#endif
1010
1011static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1012{
1013        struct atm_vcc *vcc = ATM_SD(sock);
1014        int err = 0;
1015
1016        switch (cmd) {
1017        case ATMLEC_CTRL:
1018        case ATMLEC_MCAST:
1019        case ATMLEC_DATA:
1020                if (!capable(CAP_NET_ADMIN))
1021                        return -EPERM;
1022                break;
1023        default:
1024                return -ENOIOCTLCMD;
1025        }
1026
1027        switch (cmd) {
1028        case ATMLEC_CTRL:
1029                err = lecd_attach(vcc, (int)arg);
1030                if (err >= 0)
1031                        sock->state = SS_CONNECTED;
1032                break;
1033        case ATMLEC_MCAST:
1034                err = lec_mcast_attach(vcc, (int)arg);
1035                break;
1036        case ATMLEC_DATA:
1037                err = lec_vcc_attach(vcc, (void __user *)arg);
1038                break;
1039        }
1040
1041        return err;
1042}
1043
1044static struct atm_ioctl lane_ioctl_ops = {
1045        .owner = THIS_MODULE,
1046        .ioctl = lane_ioctl,
1047};
1048
1049static int __init lane_module_init(void)
1050{
1051#ifdef CONFIG_PROC_FS
1052        struct proc_dir_entry *p;
1053
1054        p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1055        if (!p) {
1056                pr_err("Unable to initialize /proc/net/atm/lec\n");
1057                return -ENOMEM;
1058        }
1059#endif
1060
1061        register_atm_ioctl(&lane_ioctl_ops);
1062        pr_info("lec.c: initialized\n");
1063        return 0;
1064}
1065
1066static void __exit lane_module_cleanup(void)
1067{
1068        int i;
1069
1070        remove_proc_entry("lec", atm_proc_root);
1071
1072        deregister_atm_ioctl(&lane_ioctl_ops);
1073
1074        for (i = 0; i < MAX_LEC_ITF; i++) {
1075                if (dev_lec[i] != NULL) {
1076                        unregister_netdev(dev_lec[i]);
1077                        free_netdev(dev_lec[i]);
1078                        dev_lec[i] = NULL;
1079                }
1080        }
1081}
1082
1083module_init(lane_module_init);
1084module_exit(lane_module_cleanup);
1085
1086/*
1087 * LANE2: 3.1.3, LE_RESOLVE.request
1088 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1089 * If sizeoftlvs == NULL the default TLVs associated with with this
1090 * lec will be used.
1091 * If dst_mac == NULL, targetless LE_ARP will be sent
1092 */
1093static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1094                         u8 **tlvs, u32 *sizeoftlvs)
1095{
1096        unsigned long flags;
1097        struct lec_priv *priv = netdev_priv(dev);
1098        struct lec_arp_table *table;
1099        struct sk_buff *skb;
1100        int retval;
1101
1102        if (force == 0) {
1103                spin_lock_irqsave(&priv->lec_arp_lock, flags);
1104                table = lec_arp_find(priv, dst_mac);
1105                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1106                if (table == NULL)
1107                        return -1;
1108
1109                *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1110                if (*tlvs == NULL)
1111                        return -1;
1112
1113                *sizeoftlvs = table->sizeoftlvs;
1114
1115                return 0;
1116        }
1117
1118        if (sizeoftlvs == NULL)
1119                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1120
1121        else {
1122                skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1123                if (skb == NULL)
1124                        return -1;
1125                skb->len = *sizeoftlvs;
1126                skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1127                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1128        }
1129        return retval;
1130}
1131
1132/*
1133 * LANE2: 3.1.4, LE_ASSOCIATE.request
1134 * Associate the *tlvs with the *lan_dst address.
1135 * Will overwrite any previous association
1136 * Returns 1 for success, 0 for failure (out of memory)
1137 *
1138 */
1139static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1140                               const u8 *tlvs, u32 sizeoftlvs)
1141{
1142        int retval;
1143        struct sk_buff *skb;
1144        struct lec_priv *priv = netdev_priv(dev);
1145
1146        if (!ether_addr_equal(lan_dst, dev->dev_addr))
1147                return 0;       /* not our mac address */
1148
1149        kfree(priv->tlvs);      /* NULL if there was no previous association */
1150
1151        priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1152        if (priv->tlvs == NULL)
1153                return 0;
1154        priv->sizeoftlvs = sizeoftlvs;
1155
1156        skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1157        if (skb == NULL)
1158                return 0;
1159        skb->len = sizeoftlvs;
1160        skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1161        retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1162        if (retval != 0)
1163                pr_info("lec.c: lane2_associate_req() failed\n");
1164        /*
1165         * If the previous association has changed we must
1166         * somehow notify other LANE entities about the change
1167         */
1168        return 1;
1169}
1170
1171/*
1172 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1173 *
1174 */
1175static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1176                                const u8 *tlvs, u32 sizeoftlvs)
1177{
1178#if 0
1179        int i = 0;
1180#endif
1181        struct lec_priv *priv = netdev_priv(dev);
1182#if 0                           /*
1183                                 * Why have the TLVs in LE_ARP entries
1184                                 * since we do not use them? When you
1185                                 * uncomment this code, make sure the
1186                                 * TLVs get freed when entry is killed
1187                                 */
1188        struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1189
1190        if (entry == NULL)
1191                return;         /* should not happen */
1192
1193        kfree(entry->tlvs);
1194
1195        entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1196        if (entry->tlvs == NULL)
1197                return;
1198        entry->sizeoftlvs = sizeoftlvs;
1199#endif
1200#if 0
1201        pr_info("\n");
1202        pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1203        while (i < sizeoftlvs)
1204                pr_cont("%02x ", tlvs[i++]);
1205
1206        pr_cont("\n");
1207#endif
1208
1209        /* tell MPOA about the TLVs we saw */
1210        if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1211                priv->lane2_ops->associate_indicator(dev, mac_addr,
1212                                                     tlvs, sizeoftlvs);
1213        }
1214}
1215
1216/*
1217 * Here starts what used to lec_arpc.c
1218 *
1219 * lec_arpc.c was added here when making
1220 * lane client modular. October 1997
1221 */
1222
1223#include <linux/types.h>
1224#include <linux/timer.h>
1225#include <linux/param.h>
1226#include <linux/atomic.h>
1227#include <linux/inetdevice.h>
1228#include <net/route.h>
1229
1230#if 0
1231#define pr_debug(format, args...)
1232/*
1233  #define pr_debug printk
1234*/
1235#endif
1236#define DEBUG_ARP_TABLE 0
1237
1238#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1239
1240static void lec_arp_check_expire(struct work_struct *work);
1241static void lec_arp_expire_arp(unsigned long data);
1242
1243/*
1244 * Arp table funcs
1245 */
1246
1247#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1248
1249/*
1250 * Initialization of arp-cache
1251 */
1252static void lec_arp_init(struct lec_priv *priv)
1253{
1254        unsigned short i;
1255
1256        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1257                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1258        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1259        INIT_HLIST_HEAD(&priv->lec_no_forward);
1260        INIT_HLIST_HEAD(&priv->mcast_fwds);
1261        spin_lock_init(&priv->lec_arp_lock);
1262        INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1263        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1264}
1265
1266static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1267{
1268        if (entry->vcc) {
1269                struct atm_vcc *vcc = entry->vcc;
1270                struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1271                struct net_device *dev = (struct net_device *)vcc->proto_data;
1272
1273                vcc->pop = vpriv->old_pop;
1274                if (vpriv->xoff)
1275                        netif_wake_queue(dev);
1276                kfree(vpriv);
1277                vcc->user_back = NULL;
1278                vcc->push = entry->old_push;
1279                vcc_release_async(vcc, -EPIPE);
1280                entry->vcc = NULL;
1281        }
1282        if (entry->recv_vcc) {
1283                entry->recv_vcc->push = entry->old_recv_push;
1284                vcc_release_async(entry->recv_vcc, -EPIPE);
1285                entry->recv_vcc = NULL;
1286        }
1287}
1288
1289/*
1290 * Insert entry to lec_arp_table
1291 * LANE2: Add to the end of the list to satisfy 8.1.13
1292 */
1293static inline void
1294lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1295{
1296        struct hlist_head *tmp;
1297
1298        tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1299        hlist_add_head(&entry->next, tmp);
1300
1301        pr_debug("Added entry:%pM\n", entry->mac_addr);
1302}
1303
1304/*
1305 * Remove entry from lec_arp_table
1306 */
1307static int
1308lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1309{
1310        struct hlist_node *node;
1311        struct lec_arp_table *entry;
1312        int i, remove_vcc = 1;
1313
1314        if (!to_remove)
1315                return -1;
1316
1317        hlist_del(&to_remove->next);
1318        del_timer(&to_remove->timer);
1319
1320        /*
1321         * If this is the only MAC connected to this VCC,
1322         * also tear down the VCC
1323         */
1324        if (to_remove->status >= ESI_FLUSH_PENDING) {
1325                /*
1326                 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1327                 */
1328                for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1329                        hlist_for_each_entry(entry, node,
1330                                             &priv->lec_arp_tables[i], next) {
1331                                if (memcmp(to_remove->atm_addr,
1332                                           entry->atm_addr, ATM_ESA_LEN) == 0) {
1333                                        remove_vcc = 0;
1334                                        break;
1335                                }
1336                        }
1337                }
1338                if (remove_vcc)
1339                        lec_arp_clear_vccs(to_remove);
1340        }
1341        skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1342
1343        pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1344        return 0;
1345}
1346
1347#if DEBUG_ARP_TABLE
1348static const char *get_status_string(unsigned char st)
1349{
1350        switch (st) {
1351        case ESI_UNKNOWN:
1352                return "ESI_UNKNOWN";
1353        case ESI_ARP_PENDING:
1354                return "ESI_ARP_PENDING";
1355        case ESI_VC_PENDING:
1356                return "ESI_VC_PENDING";
1357        case ESI_FLUSH_PENDING:
1358                return "ESI_FLUSH_PENDING";
1359        case ESI_FORWARD_DIRECT:
1360                return "ESI_FORWARD_DIRECT";
1361        }
1362        return "<UNKNOWN>";
1363}
1364
1365static void dump_arp_table(struct lec_priv *priv)
1366{
1367        struct hlist_node *node;
1368        struct lec_arp_table *rulla;
1369        char buf[256];
1370        int i, j, offset;
1371
1372        pr_info("Dump %p:\n", priv);
1373        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1374                hlist_for_each_entry(rulla, node,
1375                                     &priv->lec_arp_tables[i], next) {
1376                        offset = 0;
1377                        offset += sprintf(buf, "%d: %p\n", i, rulla);
1378                        offset += sprintf(buf + offset, "Mac: %pM",
1379                                          rulla->mac_addr);
1380                        offset += sprintf(buf + offset, " Atm:");
1381                        for (j = 0; j < ATM_ESA_LEN; j++) {
1382                                offset += sprintf(buf + offset,
1383                                                  "%2.2x ",
1384                                                  rulla->atm_addr[j] & 0xff);
1385                        }
1386                        offset += sprintf(buf + offset,
1387                                          "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1388                                          rulla->vcc ? rulla->vcc->vpi : 0,
1389                                          rulla->vcc ? rulla->vcc->vci : 0,
1390                                          rulla->recv_vcc ? rulla->recv_vcc->
1391                                          vpi : 0,
1392                                          rulla->recv_vcc ? rulla->recv_vcc->
1393                                          vci : 0, rulla->last_used,
1394                                          rulla->timestamp, rulla->no_tries);
1395                        offset +=
1396                            sprintf(buf + offset,
1397                                    "Flags:%x, Packets_flooded:%x, Status: %s ",
1398                                    rulla->flags, rulla->packets_flooded,
1399                                    get_status_string(rulla->status));
1400                        pr_info("%s\n", buf);
1401                }
1402        }
1403
1404        if (!hlist_empty(&priv->lec_no_forward))
1405                pr_info("No forward\n");
1406        hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1407                offset = 0;
1408                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1409                offset += sprintf(buf + offset, " Atm:");
1410                for (j = 0; j < ATM_ESA_LEN; j++) {
1411                        offset += sprintf(buf + offset, "%2.2x ",
1412                                          rulla->atm_addr[j] & 0xff);
1413                }
1414                offset += sprintf(buf + offset,
1415                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1416                                  rulla->vcc ? rulla->vcc->vpi : 0,
1417                                  rulla->vcc ? rulla->vcc->vci : 0,
1418                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1419                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1420                                  rulla->last_used,
1421                                  rulla->timestamp, rulla->no_tries);
1422                offset += sprintf(buf + offset,
1423                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1424                                  rulla->flags, rulla->packets_flooded,
1425                                  get_status_string(rulla->status));
1426                pr_info("%s\n", buf);
1427        }
1428
1429        if (!hlist_empty(&priv->lec_arp_empty_ones))
1430                pr_info("Empty ones\n");
1431        hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1432                offset = 0;
1433                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1434                offset += sprintf(buf + offset, " Atm:");
1435                for (j = 0; j < ATM_ESA_LEN; j++) {
1436                        offset += sprintf(buf + offset, "%2.2x ",
1437                                          rulla->atm_addr[j] & 0xff);
1438                }
1439                offset += sprintf(buf + offset,
1440                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1441                                  rulla->vcc ? rulla->vcc->vpi : 0,
1442                                  rulla->vcc ? rulla->vcc->vci : 0,
1443                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1444                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1445                                  rulla->last_used,
1446                                  rulla->timestamp, rulla->no_tries);
1447                offset += sprintf(buf + offset,
1448                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1449                                  rulla->flags, rulla->packets_flooded,
1450                                  get_status_string(rulla->status));
1451                pr_info("%s", buf);
1452        }
1453
1454        if (!hlist_empty(&priv->mcast_fwds))
1455                pr_info("Multicast Forward VCCs\n");
1456        hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1457                offset = 0;
1458                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1459                offset += sprintf(buf + offset, " Atm:");
1460                for (j = 0; j < ATM_ESA_LEN; j++) {
1461                        offset += sprintf(buf + offset, "%2.2x ",
1462                                          rulla->atm_addr[j] & 0xff);
1463                }
1464                offset += sprintf(buf + offset,
1465                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1466                                  rulla->vcc ? rulla->vcc->vpi : 0,
1467                                  rulla->vcc ? rulla->vcc->vci : 0,
1468                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1469                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1470                                  rulla->last_used,
1471                                  rulla->timestamp, rulla->no_tries);
1472                offset += sprintf(buf + offset,
1473                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1474                                  rulla->flags, rulla->packets_flooded,
1475                                  get_status_string(rulla->status));
1476                pr_info("%s\n", buf);
1477        }
1478
1479}
1480#else
1481#define dump_arp_table(priv) do { } while (0)
1482#endif
1483
1484/*
1485 * Destruction of arp-cache
1486 */
1487static void lec_arp_destroy(struct lec_priv *priv)
1488{
1489        unsigned long flags;
1490        struct hlist_node *node, *next;
1491        struct lec_arp_table *entry;
1492        int i;
1493
1494        cancel_delayed_work_sync(&priv->lec_arp_work);
1495
1496        /*
1497         * Remove all entries
1498         */
1499
1500        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1501        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1502                hlist_for_each_entry_safe(entry, node, next,
1503                                          &priv->lec_arp_tables[i], next) {
1504                        lec_arp_remove(priv, entry);
1505                        lec_arp_put(entry);
1506                }
1507                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1508        }
1509
1510        hlist_for_each_entry_safe(entry, node, next,
1511                                  &priv->lec_arp_empty_ones, next) {
1512                del_timer_sync(&entry->timer);
1513                lec_arp_clear_vccs(entry);
1514                hlist_del(&entry->next);
1515                lec_arp_put(entry);
1516        }
1517        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1518
1519        hlist_for_each_entry_safe(entry, node, next,
1520                                  &priv->lec_no_forward, next) {
1521                del_timer_sync(&entry->timer);
1522                lec_arp_clear_vccs(entry);
1523                hlist_del(&entry->next);
1524                lec_arp_put(entry);
1525        }
1526        INIT_HLIST_HEAD(&priv->lec_no_forward);
1527
1528        hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1529                /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1530                lec_arp_clear_vccs(entry);
1531                hlist_del(&entry->next);
1532                lec_arp_put(entry);
1533        }
1534        INIT_HLIST_HEAD(&priv->mcast_fwds);
1535        priv->mcast_vcc = NULL;
1536        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1537}
1538
1539/*
1540 * Find entry by mac_address
1541 */
1542static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1543                                          const unsigned char *mac_addr)
1544{
1545        struct hlist_node *node;
1546        struct hlist_head *head;
1547        struct lec_arp_table *entry;
1548
1549        pr_debug("%pM\n", mac_addr);
1550
1551        head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1552        hlist_for_each_entry(entry, node, head, next) {
1553                if (ether_addr_equal(mac_addr, entry->mac_addr))
1554                        return entry;
1555        }
1556        return NULL;
1557}
1558
1559static struct lec_arp_table *make_entry(struct lec_priv *priv,
1560                                        const unsigned char *mac_addr)
1561{
1562        struct lec_arp_table *to_return;
1563
1564        to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1565        if (!to_return) {
1566                pr_info("LEC: Arp entry kmalloc failed\n");
1567                return NULL;
1568        }
1569        memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1570        INIT_HLIST_NODE(&to_return->next);
1571        setup_timer(&to_return->timer, lec_arp_expire_arp,
1572                        (unsigned long)to_return);
1573        to_return->last_used = jiffies;
1574        to_return->priv = priv;
1575        skb_queue_head_init(&to_return->tx_wait);
1576        atomic_set(&to_return->usage, 1);
1577        return to_return;
1578}
1579
1580/* Arp sent timer expired */
1581static void lec_arp_expire_arp(unsigned long data)
1582{
1583        struct lec_arp_table *entry;
1584
1585        entry = (struct lec_arp_table *)data;
1586
1587        pr_debug("\n");
1588        if (entry->status == ESI_ARP_PENDING) {
1589                if (entry->no_tries <= entry->priv->max_retry_count) {
1590                        if (entry->is_rdesc)
1591                                send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1592                                             entry->mac_addr, NULL, NULL);
1593                        else
1594                                send_to_lecd(entry->priv, l_arp_xmt,
1595                                             entry->mac_addr, NULL, NULL);
1596                        entry->no_tries++;
1597                }
1598                mod_timer(&entry->timer, jiffies + (1 * HZ));
1599        }
1600}
1601
1602/* Unknown/unused vcc expire, remove associated entry */
1603static void lec_arp_expire_vcc(unsigned long data)
1604{
1605        unsigned long flags;
1606        struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1607        struct lec_priv *priv = to_remove->priv;
1608
1609        del_timer(&to_remove->timer);
1610
1611        pr_debug("%p %p: vpi:%d vci:%d\n",
1612                 to_remove, priv,
1613                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1614                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1615
1616        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1617        hlist_del(&to_remove->next);
1618        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1619
1620        lec_arp_clear_vccs(to_remove);
1621        lec_arp_put(to_remove);
1622}
1623
1624static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1625                                   unsigned long now,
1626                                   struct lec_priv *priv)
1627{
1628        unsigned long time_to_check;
1629
1630        if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1631                time_to_check = priv->forward_delay_time;
1632        else
1633                time_to_check = priv->aging_time;
1634
1635        pr_debug("About to expire: %lx - %lx > %lx\n",
1636                 now, entry->last_used, time_to_check);
1637        if (time_after(now, entry->last_used + time_to_check) &&
1638            !(entry->flags & LEC_PERMANENT_FLAG) &&
1639            !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1640                /* Remove entry */
1641                pr_debug("Entry timed out\n");
1642                lec_arp_remove(priv, entry);
1643                lec_arp_put(entry);
1644        } else {
1645                /* Something else */
1646                if ((entry->status == ESI_VC_PENDING ||
1647                     entry->status == ESI_ARP_PENDING) &&
1648                    time_after_eq(now, entry->timestamp +
1649                                       priv->max_unknown_frame_time)) {
1650                        entry->timestamp = jiffies;
1651                        entry->packets_flooded = 0;
1652                        if (entry->status == ESI_VC_PENDING)
1653                                send_to_lecd(priv, l_svc_setup,
1654                                             entry->mac_addr,
1655                                             entry->atm_addr,
1656                                             NULL);
1657                }
1658                if (entry->status == ESI_FLUSH_PENDING &&
1659                    time_after_eq(now, entry->timestamp +
1660                                       priv->path_switching_delay)) {
1661                        lec_arp_hold(entry);
1662                        return true;
1663                }
1664        }
1665
1666        return false;
1667}
1668/*
1669 * Expire entries.
1670 * 1. Re-set timer
1671 * 2. For each entry, delete entries that have aged past the age limit.
1672 * 3. For each entry, depending on the status of the entry, perform
1673 *    the following maintenance.
1674 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1675 *       tick_count is above the max_unknown_frame_time, clear
1676 *       the tick_count to zero and clear the packets_flooded counter
1677 *       to zero. This supports the packet rate limit per address
1678 *       while flooding unknowns.
1679 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1680 *       than or equal to the path_switching_delay, change the status
1681 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1682 *       regardless of the progress of the flush protocol.
1683 */
1684static void lec_arp_check_expire(struct work_struct *work)
1685{
1686        unsigned long flags;
1687        struct lec_priv *priv =
1688                container_of(work, struct lec_priv, lec_arp_work.work);
1689        struct hlist_node *node, *next;
1690        struct lec_arp_table *entry;
1691        unsigned long now;
1692        int i;
1693
1694        pr_debug("%p\n", priv);
1695        now = jiffies;
1696restart:
1697        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1698        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1699                hlist_for_each_entry_safe(entry, node, next,
1700                                          &priv->lec_arp_tables[i], next) {
1701                        if (__lec_arp_check_expire(entry, now, priv)) {
1702                                struct sk_buff *skb;
1703                                struct atm_vcc *vcc = entry->vcc;
1704
1705                                spin_unlock_irqrestore(&priv->lec_arp_lock,
1706                                                       flags);
1707                                while ((skb = skb_dequeue(&entry->tx_wait)))
1708                                        lec_send(vcc, skb);
1709                                entry->last_used = jiffies;
1710                                entry->status = ESI_FORWARD_DIRECT;
1711                                lec_arp_put(entry);
1712
1713                                goto restart;
1714                        }
1715                }
1716        }
1717        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1718
1719        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1720}
1721
1722/*
1723 * Try to find vcc where mac_address is attached.
1724 *
1725 */
1726static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1727                                       const unsigned char *mac_to_find,
1728                                       int is_rdesc,
1729                                       struct lec_arp_table **ret_entry)
1730{
1731        unsigned long flags;
1732        struct lec_arp_table *entry;
1733        struct atm_vcc *found;
1734
1735        if (mac_to_find[0] & 0x01) {
1736                switch (priv->lane_version) {
1737                case 1:
1738                        return priv->mcast_vcc;
1739                case 2: /* LANE2 wants arp for multicast addresses */
1740                        if (ether_addr_equal(mac_to_find, bus_mac))
1741                                return priv->mcast_vcc;
1742                        break;
1743                default:
1744                        break;
1745                }
1746        }
1747
1748        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1749        entry = lec_arp_find(priv, mac_to_find);
1750
1751        if (entry) {
1752                if (entry->status == ESI_FORWARD_DIRECT) {
1753                        /* Connection Ok */
1754                        entry->last_used = jiffies;
1755                        lec_arp_hold(entry);
1756                        *ret_entry = entry;
1757                        found = entry->vcc;
1758                        goto out;
1759                }
1760                /*
1761                 * If the LE_ARP cache entry is still pending, reset count to 0
1762                 * so another LE_ARP request can be made for this frame.
1763                 */
1764                if (entry->status == ESI_ARP_PENDING)
1765                        entry->no_tries = 0;
1766                /*
1767                 * Data direct VC not yet set up, check to see if the unknown
1768                 * frame count is greater than the limit. If the limit has
1769                 * not been reached, allow the caller to send packet to
1770                 * BUS.
1771                 */
1772                if (entry->status != ESI_FLUSH_PENDING &&
1773                    entry->packets_flooded <
1774                    priv->maximum_unknown_frame_count) {
1775                        entry->packets_flooded++;
1776                        pr_debug("Flooding..\n");
1777                        found = priv->mcast_vcc;
1778                        goto out;
1779                }
1780                /*
1781                 * We got here because entry->status == ESI_FLUSH_PENDING
1782                 * or BUS flood limit was reached for an entry which is
1783                 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1784                 */
1785                lec_arp_hold(entry);
1786                *ret_entry = entry;
1787                pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1788                         entry->vcc);
1789                found = NULL;
1790        } else {
1791                /* No matching entry was found */
1792                entry = make_entry(priv, mac_to_find);
1793                pr_debug("Making entry\n");
1794                if (!entry) {
1795                        found = priv->mcast_vcc;
1796                        goto out;
1797                }
1798                lec_arp_add(priv, entry);
1799                /* We want arp-request(s) to be sent */
1800                entry->packets_flooded = 1;
1801                entry->status = ESI_ARP_PENDING;
1802                entry->no_tries = 1;
1803                entry->last_used = entry->timestamp = jiffies;
1804                entry->is_rdesc = is_rdesc;
1805                if (entry->is_rdesc)
1806                        send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1807                                     NULL);
1808                else
1809                        send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1810                entry->timer.expires = jiffies + (1 * HZ);
1811                entry->timer.function = lec_arp_expire_arp;
1812                add_timer(&entry->timer);
1813                found = priv->mcast_vcc;
1814        }
1815
1816out:
1817        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1818        return found;
1819}
1820
1821static int
1822lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1823                unsigned long permanent)
1824{
1825        unsigned long flags;
1826        struct hlist_node *node, *next;
1827        struct lec_arp_table *entry;
1828        int i;
1829
1830        pr_debug("\n");
1831        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1832        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1833                hlist_for_each_entry_safe(entry, node, next,
1834                                          &priv->lec_arp_tables[i], next) {
1835                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1836                            (permanent ||
1837                             !(entry->flags & LEC_PERMANENT_FLAG))) {
1838                                lec_arp_remove(priv, entry);
1839                                lec_arp_put(entry);
1840                        }
1841                        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1842                        return 0;
1843                }
1844        }
1845        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1846        return -1;
1847}
1848
1849/*
1850 * Notifies:  Response to arp_request (atm_addr != NULL)
1851 */
1852static void
1853lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1854               const unsigned char *atm_addr, unsigned long remoteflag,
1855               unsigned int targetless_le_arp)
1856{
1857        unsigned long flags;
1858        struct hlist_node *node, *next;
1859        struct lec_arp_table *entry, *tmp;
1860        int i;
1861
1862        pr_debug("%smac:%pM\n",
1863                 (targetless_le_arp) ? "targetless " : "", mac_addr);
1864
1865        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1866        entry = lec_arp_find(priv, mac_addr);
1867        if (entry == NULL && targetless_le_arp)
1868                goto out;       /*
1869                                 * LANE2: ignore targetless LE_ARPs for which
1870                                 * we have no entry in the cache. 7.1.30
1871                                 */
1872        if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1873                hlist_for_each_entry_safe(entry, node, next,
1874                                          &priv->lec_arp_empty_ones, next) {
1875                        if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1876                                hlist_del(&entry->next);
1877                                del_timer(&entry->timer);
1878                                tmp = lec_arp_find(priv, mac_addr);
1879                                if (tmp) {
1880                                        del_timer(&tmp->timer);
1881                                        tmp->status = ESI_FORWARD_DIRECT;
1882                                        memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1883                                        tmp->vcc = entry->vcc;
1884                                        tmp->old_push = entry->old_push;
1885                                        tmp->last_used = jiffies;
1886                                        del_timer(&entry->timer);
1887                                        lec_arp_put(entry);
1888                                        entry = tmp;
1889                                } else {
1890                                        entry->status = ESI_FORWARD_DIRECT;
1891                                        memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
1892                                        entry->last_used = jiffies;
1893                                        lec_arp_add(priv, entry);
1894                                }
1895                                if (remoteflag)
1896                                        entry->flags |= LEC_REMOTE_FLAG;
1897                                else
1898                                        entry->flags &= ~LEC_REMOTE_FLAG;
1899                                pr_debug("After update\n");
1900                                dump_arp_table(priv);
1901                                goto out;
1902                        }
1903                }
1904        }
1905
1906        entry = lec_arp_find(priv, mac_addr);
1907        if (!entry) {
1908                entry = make_entry(priv, mac_addr);
1909                if (!entry)
1910                        goto out;
1911                entry->status = ESI_UNKNOWN;
1912                lec_arp_add(priv, entry);
1913                /* Temporary, changes before end of function */
1914        }
1915        memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1916        del_timer(&entry->timer);
1917        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1918                hlist_for_each_entry(tmp, node,
1919                                     &priv->lec_arp_tables[i], next) {
1920                        if (entry != tmp &&
1921                            !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1922                                /* Vcc to this host exists */
1923                                if (tmp->status > ESI_VC_PENDING) {
1924                                        /*
1925                                         * ESI_FLUSH_PENDING,
1926                                         * ESI_FORWARD_DIRECT
1927                                         */
1928                                        entry->vcc = tmp->vcc;
1929                                        entry->old_push = tmp->old_push;
1930                                }
1931                                entry->status = tmp->status;
1932                                break;
1933                        }
1934                }
1935        }
1936        if (remoteflag)
1937                entry->flags |= LEC_REMOTE_FLAG;
1938        else
1939                entry->flags &= ~LEC_REMOTE_FLAG;
1940        if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1941                entry->status = ESI_VC_PENDING;
1942                send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1943        }
1944        pr_debug("After update2\n");
1945        dump_arp_table(priv);
1946out:
1947        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1948}
1949
1950/*
1951 * Notifies: Vcc setup ready
1952 */
1953static void
1954lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1955              struct atm_vcc *vcc,
1956              void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1957{
1958        unsigned long flags;
1959        struct hlist_node *node;
1960        struct lec_arp_table *entry;
1961        int i, found_entry = 0;
1962
1963        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1964        /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1965        if (ioc_data->receive == 2) {
1966                pr_debug("LEC_ARP: Attaching mcast forward\n");
1967#if 0
1968                entry = lec_arp_find(priv, bus_mac);
1969                if (!entry) {
1970                        pr_info("LEC_ARP: Multicast entry not found!\n");
1971                        goto out;
1972                }
1973                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1974                entry->recv_vcc = vcc;
1975                entry->old_recv_push = old_push;
1976#endif
1977                entry = make_entry(priv, bus_mac);
1978                if (entry == NULL)
1979                        goto out;
1980                del_timer(&entry->timer);
1981                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1982                entry->recv_vcc = vcc;
1983                entry->old_recv_push = old_push;
1984                hlist_add_head(&entry->next, &priv->mcast_fwds);
1985                goto out;
1986        } else if (ioc_data->receive == 1) {
1987                /*
1988                 * Vcc which we don't want to make default vcc,
1989                 * attach it anyway.
1990                 */
1991                pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1992                         ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1993                         ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1994                         ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1995                         ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1996                         ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1997                         ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1998                         ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1999                         ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2000                         ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2001                         ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2002                entry = make_entry(priv, bus_mac);
2003                if (entry == NULL)
2004                        goto out;
2005                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2006                memset(entry->mac_addr, 0, ETH_ALEN);
2007                entry->recv_vcc = vcc;
2008                entry->old_recv_push = old_push;
2009                entry->status = ESI_UNKNOWN;
2010                entry->timer.expires = jiffies + priv->vcc_timeout_period;
2011                entry->timer.function = lec_arp_expire_vcc;
2012                hlist_add_head(&entry->next, &priv->lec_no_forward);
2013                add_timer(&entry->timer);
2014                dump_arp_table(priv);
2015                goto out;
2016        }
2017        pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2018                 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2019                 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2020                 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2021                 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2022                 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2023                 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2024                 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2025                 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2026                 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2027                 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2028        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2029                hlist_for_each_entry(entry, node,
2030                                     &priv->lec_arp_tables[i], next) {
2031                        if (memcmp
2032                            (ioc_data->atm_addr, entry->atm_addr,
2033                             ATM_ESA_LEN) == 0) {
2034                                pr_debug("LEC_ARP: Attaching data direct\n");
2035                                pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2036                                         entry->vcc ? entry->vcc->vci : 0,
2037                                         entry->recv_vcc ? entry->recv_vcc->
2038                                         vci : 0);
2039                                found_entry = 1;
2040                                del_timer(&entry->timer);
2041                                entry->vcc = vcc;
2042                                entry->old_push = old_push;
2043                                if (entry->status == ESI_VC_PENDING) {
2044                                        if (priv->maximum_unknown_frame_count
2045                                            == 0)
2046                                                entry->status =
2047                                                    ESI_FORWARD_DIRECT;
2048                                        else {
2049                                                entry->timestamp = jiffies;
2050                                                entry->status =
2051                                                    ESI_FLUSH_PENDING;
2052#if 0
2053                                                send_to_lecd(priv, l_flush_xmt,
2054                                                             NULL,
2055                                                             entry->atm_addr,
2056                                                             NULL);
2057#endif
2058                                        }
2059                                } else {
2060                                        /*
2061                                         * They were forming a connection
2062                                         * to us, and we to them. Our
2063                                         * ATM address is numerically lower
2064                                         * than theirs, so we make connection
2065                                         * we formed into default VCC (8.1.11).
2066                                         * Connection they made gets torn
2067                                         * down. This might confuse some
2068                                         * clients. Can be changed if
2069                                         * someone reports trouble...
2070                                         */
2071                                        ;
2072                                }
2073                        }
2074                }
2075        }
2076        if (found_entry) {
2077                pr_debug("After vcc was added\n");
2078                dump_arp_table(priv);
2079                goto out;
2080        }
2081        /*
2082         * Not found, snatch address from first data packet that arrives
2083         * from this vcc
2084         */
2085        entry = make_entry(priv, bus_mac);
2086        if (!entry)
2087                goto out;
2088        entry->vcc = vcc;
2089        entry->old_push = old_push;
2090        memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2091        memset(entry->mac_addr, 0, ETH_ALEN);
2092        entry->status = ESI_UNKNOWN;
2093        hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2094        entry->timer.expires = jiffies + priv->vcc_timeout_period;
2095        entry->timer.function = lec_arp_expire_vcc;
2096        add_timer(&entry->timer);
2097        pr_debug("After vcc was added\n");
2098        dump_arp_table(priv);
2099out:
2100        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2101}
2102
2103static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2104{
2105        unsigned long flags;
2106        struct hlist_node *node;
2107        struct lec_arp_table *entry;
2108        int i;
2109
2110        pr_debug("%lx\n", tran_id);
2111restart:
2112        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2113        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2114                hlist_for_each_entry(entry, node,
2115                                     &priv->lec_arp_tables[i], next) {
2116                        if (entry->flush_tran_id == tran_id &&
2117                            entry->status == ESI_FLUSH_PENDING) {
2118                                struct sk_buff *skb;
2119                                struct atm_vcc *vcc = entry->vcc;
2120
2121                                lec_arp_hold(entry);
2122                                spin_unlock_irqrestore(&priv->lec_arp_lock,
2123                                                       flags);
2124                                while ((skb = skb_dequeue(&entry->tx_wait)))
2125                                        lec_send(vcc, skb);
2126                                entry->last_used = jiffies;
2127                                entry->status = ESI_FORWARD_DIRECT;
2128                                lec_arp_put(entry);
2129                                pr_debug("LEC_ARP: Flushed\n");
2130                                goto restart;
2131                        }
2132                }
2133        }
2134        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2135        dump_arp_table(priv);
2136}
2137
2138static void
2139lec_set_flush_tran_id(struct lec_priv *priv,
2140                      const unsigned char *atm_addr, unsigned long tran_id)
2141{
2142        unsigned long flags;
2143        struct hlist_node *node;
2144        struct lec_arp_table *entry;
2145        int i;
2146
2147        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2148        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2149                hlist_for_each_entry(entry, node,
2150                                     &priv->lec_arp_tables[i], next) {
2151                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2152                                entry->flush_tran_id = tran_id;
2153                                pr_debug("Set flush transaction id to %lx for %p\n",
2154                                         tran_id, entry);
2155                        }
2156                }
2157        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2158}
2159
2160static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2161{
2162        unsigned long flags;
2163        unsigned char mac_addr[] = {
2164                0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2165        };
2166        struct lec_arp_table *to_add;
2167        struct lec_vcc_priv *vpriv;
2168        int err = 0;
2169
2170        vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2171        if (!vpriv)
2172                return -ENOMEM;
2173        vpriv->xoff = 0;
2174        vpriv->old_pop = vcc->pop;
2175        vcc->user_back = vpriv;
2176        vcc->pop = lec_pop;
2177        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2178        to_add = make_entry(priv, mac_addr);
2179        if (!to_add) {
2180                vcc->pop = vpriv->old_pop;
2181                kfree(vpriv);
2182                err = -ENOMEM;
2183                goto out;
2184        }
2185        memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2186        to_add->status = ESI_FORWARD_DIRECT;
2187        to_add->flags |= LEC_PERMANENT_FLAG;
2188        to_add->vcc = vcc;
2189        to_add->old_push = vcc->push;
2190        vcc->push = lec_push;
2191        priv->mcast_vcc = vcc;
2192        lec_arp_add(priv, to_add);
2193out:
2194        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2195        return err;
2196}
2197
2198static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2199{
2200        unsigned long flags;
2201        struct hlist_node *node, *next;
2202        struct lec_arp_table *entry;
2203        int i;
2204
2205        pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2206        dump_arp_table(priv);
2207
2208        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2209
2210        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2211                hlist_for_each_entry_safe(entry, node, next,
2212                                          &priv->lec_arp_tables[i], next) {
2213                        if (vcc == entry->vcc) {
2214                                lec_arp_remove(priv, entry);
2215                                lec_arp_put(entry);
2216                                if (priv->mcast_vcc == vcc)
2217                                        priv->mcast_vcc = NULL;
2218                        }
2219                }
2220        }
2221
2222        hlist_for_each_entry_safe(entry, node, next,
2223                                  &priv->lec_arp_empty_ones, next) {
2224                if (entry->vcc == vcc) {
2225                        lec_arp_clear_vccs(entry);
2226                        del_timer(&entry->timer);
2227                        hlist_del(&entry->next);
2228                        lec_arp_put(entry);
2229                }
2230        }
2231
2232        hlist_for_each_entry_safe(entry, node, next,
2233                                  &priv->lec_no_forward, next) {
2234                if (entry->recv_vcc == vcc) {
2235                        lec_arp_clear_vccs(entry);
2236                        del_timer(&entry->timer);
2237                        hlist_del(&entry->next);
2238                        lec_arp_put(entry);
2239                }
2240        }
2241
2242        hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2243                if (entry->recv_vcc == vcc) {
2244                        lec_arp_clear_vccs(entry);
2245                        /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2246                        hlist_del(&entry->next);
2247                        lec_arp_put(entry);
2248                }
2249        }
2250
2251        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2252        dump_arp_table(priv);
2253}
2254
2255static void
2256lec_arp_check_empties(struct lec_priv *priv,
2257                      struct atm_vcc *vcc, struct sk_buff *skb)
2258{
2259        unsigned long flags;
2260        struct hlist_node *node, *next;
2261        struct lec_arp_table *entry, *tmp;
2262        struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2263        unsigned char *src = hdr->h_source;
2264
2265        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2266        hlist_for_each_entry_safe(entry, node, next,
2267                                  &priv->lec_arp_empty_ones, next) {
2268                if (vcc == entry->vcc) {
2269                        del_timer(&entry->timer);
2270                        memcpy(entry->mac_addr, src, ETH_ALEN);
2271                        entry->status = ESI_FORWARD_DIRECT;
2272                        entry->last_used = jiffies;
2273                        /* We might have got an entry */
2274                        tmp = lec_arp_find(priv, src);
2275                        if (tmp) {
2276                                lec_arp_remove(priv, tmp);
2277                                lec_arp_put(tmp);
2278                        }
2279                        hlist_del(&entry->next);
2280                        lec_arp_add(priv, entry);
2281                        goto out;
2282                }
2283        }
2284        pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2285out:
2286        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2287}
2288
2289MODULE_LICENSE("GPL");
2290
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