net/atm/lec.c

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