net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9 #include <linux/slab.h>
  10 #include <linux/kernel.h>
  11 #include <linux/bitops.h>
  12 #include <linux/capability.h>
  13
  14 /* We are ethernet device */
  15 #include <linux/if_ether.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <net/sock.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/ip.h>
  21 #include <asm/byteorder.h>
  22 #include <linux/uaccess.h>
  23 #include <net/arp.h>
  24 #include <net/dst.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/seq_file.h>
  28
  29 /* And atm device */
  30 #include <linux/atmdev.h>
  31 #include <linux/atmlec.h>
  32
  33 /* Proxy LEC knows about bridging */
  34 #if IS_ENABLED(CONFIG_BRIDGE)
  35 #include "../bridge/br_private.h"
  36
  37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  38 #endif
  39
  40 /* Modular too */
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43
  44 /* Hardening for Spectre-v1 */
  45 #include <linux/nospec.h>
  46
  47 #include "lec.h"
  48 #include "lec_arpc.h"
  49 #include "resources.h"
  50
  51 #define DUMP_PACKETS 0          /*
  52                                  * 0 = None,
  53                                  * 1 = 30 first bytes
  54                                  * 2 = Whole packet
  55                                  */
  56
  57 #define LEC_UNRES_QUE_LEN 8     /*
  58                                  * number of tx packets to queue for a
  59                                  * single destination while waiting for SVC
  60                                  */
  61
  62 static int lec_open(struct net_device *dev);
  63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  64                                   struct net_device *dev);
  65 static int lec_close(struct net_device *dev);
  66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  67                                           const unsigned char *mac_addr);
  68 static int lec_arp_remove(struct lec_priv *priv,
  69                           struct lec_arp_table *to_remove);
  70 /* LANE2 functions */
  71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  72                                 const u8 *tlvs, u32 sizeoftlvs);
  73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  74                          u8 **tlvs, u32 *sizeoftlvs);
  75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  76                                const u8 *tlvs, u32 sizeoftlvs);
  77
  78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  79                            unsigned long permanent);
  80 static void lec_arp_check_empties(struct lec_priv *priv,
  81                                   struct atm_vcc *vcc, struct sk_buff *skb);
  82 static void lec_arp_destroy(struct lec_priv *priv);
  83 static void lec_arp_init(struct lec_priv *priv);
  84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  85                                        const unsigned char *mac_to_find,
  86                                        int is_rdesc,
  87                                        struct lec_arp_table **ret_entry);
  88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  89                            const unsigned char *atm_addr,
  90                            unsigned long remoteflag,
  91                            unsigned int targetless_le_arp);
  92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  94 static void lec_set_flush_tran_id(struct lec_priv *priv,
  95                                   const unsigned char *atm_addr,
  96                                   unsigned long tran_id);
  97 static void lec_vcc_added(struct lec_priv *priv,
  98                           const struct atmlec_ioc *ioc_data,
  99                           struct atm_vcc *vcc,
 100                           void (*old_push)(struct atm_vcc *vcc,
 101                                            struct sk_buff *skb));
 102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 103
 104 /* must be done under lec_arp_lock */
 105 static inline void lec_arp_hold(struct lec_arp_table *entry)
 106 {
 107         refcount_inc(&entry->usage);
 108 }
 109
 110 static inline void lec_arp_put(struct lec_arp_table *entry)
 111 {
 112         if (refcount_dec_and_test(&entry->usage))
 113                 kfree(entry);
 114 }
 115
 116 static struct lane2_ops lane2_ops = {
 117         .resolve = lane2_resolve,               /* spec 3.1.3 */
 118         .associate_req = lane2_associate_req,   /* spec 3.1.4 */
 119         .associate_indicator = NULL             /* spec 3.1.5 */
 120 };
 121
 122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 123
 124 /* Device structures */
 125 static struct net_device *dev_lec[MAX_LEC_ITF];
 126
 127 #if IS_ENABLED(CONFIG_BRIDGE)
 128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         char *buff;
 131         struct lec_priv *priv;
 132
 133         /*
 134          * Check if this is a BPDU. If so, ask zeppelin to send
 135          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 136          * as the Config BPDU has
 137          */
 138         buff = skb->data + skb->dev->hard_header_len;
 139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 140                 struct sock *sk;
 141                 struct sk_buff *skb2;
 142                 struct atmlec_msg *mesg;
 143
 144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 145                 if (skb2 == NULL)
 146                         return;
 147                 skb2->len = sizeof(struct atmlec_msg);
 148                 mesg = (struct atmlec_msg *)skb2->data;
 149                 mesg->type = l_topology_change;
 150                 buff += 4;
 151                 mesg->content.normal.flag = *buff & 0x01;
 152                                         /* 0x01 is topology change */
 153
 154                 priv = netdev_priv(dev);
 155                 atm_force_charge(priv->lecd, skb2->truesize);
 156                 sk = sk_atm(priv->lecd);
 157                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 158                 sk->sk_data_ready(sk);
 159         }
 160 }
 161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 162
 163 /*
 164  * Open/initialize the netdevice. This is called (in the current kernel)
 165  * sometime after booting when the 'ifconfig' program is run.
 166  *
 167  * This routine should set everything up anew at each open, even
 168  * registers that "should" only need to be set once at boot, so that
 169  * there is non-reboot way to recover if something goes wrong.
 170  */
 171
 172 static int lec_open(struct net_device *dev)
 173 {
 174         netif_start_queue(dev);
 175
 176         return 0;
 177 }
 178
 179 static void
 180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 181 {
 182         struct net_device *dev = skb->dev;
 183
 184         ATM_SKB(skb)->vcc = vcc;
 185         ATM_SKB(skb)->atm_options = vcc->atm_options;
 186
 187         refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 188         if (vcc->send(vcc, skb) < 0) {
 189                 dev->stats.tx_dropped++;
 190                 return;
 191         }
 192
 193         dev->stats.tx_packets++;
 194         dev->stats.tx_bytes += skb->len;
 195 }
 196
 197 static void lec_tx_timeout(struct net_device *dev)
 198 {
 199         pr_info("%s\n", dev->name);
 200         netif_trans_update(dev);
 201         netif_wake_queue(dev);
 202 }
 203
 204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 205                                   struct net_device *dev)
 206 {
 207         struct sk_buff *skb2;
 208         struct lec_priv *priv = netdev_priv(dev);
 209         struct lecdatahdr_8023 *lec_h;
 210         struct atm_vcc *vcc;
 211         struct lec_arp_table *entry;
 212         unsigned char *dst;
 213         int min_frame_size;
 214         int is_rdesc;
 215
 216         pr_debug("called\n");
 217         if (!priv->lecd) {
 218                 pr_info("%s:No lecd attached\n", dev->name);
 219                 dev->stats.tx_errors++;
 220                 netif_stop_queue(dev);
 221                 kfree_skb(skb);
 222                 return NETDEV_TX_OK;
 223         }
 224
 225         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 226                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 227                  (long)skb_end_pointer(skb));
 228 #if IS_ENABLED(CONFIG_BRIDGE)
 229         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 230                 lec_handle_bridge(skb, dev);
 231 #endif
 232
 233         /* Make sure we have room for lec_id */
 234         if (skb_headroom(skb) < 2) {
 235                 pr_debug("reallocating skb\n");
 236                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 237                 if (unlikely(!skb2)) {
 238                         kfree_skb(skb);
 239                         return NETDEV_TX_OK;
 240                 }
 241                 consume_skb(skb);
 242                 skb = skb2;
 243         }
 244         skb_push(skb, 2);
 245
 246         /* Put le header to place */
 247         lec_h = (struct lecdatahdr_8023 *)skb->data;
 248         lec_h->le_header = htons(priv->lecid);
 249
 250 #if DUMP_PACKETS >= 2
 251 #define MAX_DUMP_SKB 99
 252 #elif DUMP_PACKETS >= 1
 253 #define MAX_DUMP_SKB 30
 254 #endif
 255 #if DUMP_PACKETS >= 1
 256         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 257                dev->name, skb->len, priv->lecid);
 258         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 259                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 260 #endif /* DUMP_PACKETS >= 1 */
 261
 262         /* Minimum ethernet-frame size */
 263         min_frame_size = LEC_MINIMUM_8023_SIZE;
 264         if (skb->len < min_frame_size) {
 265                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 266                         skb2 = skb_copy_expand(skb, 0,
 267                                                min_frame_size - skb->truesize,
 268                                                GFP_ATOMIC);
 269                         dev_kfree_skb(skb);
 270                         if (skb2 == NULL) {
 271                                 dev->stats.tx_dropped++;
 272                                 return NETDEV_TX_OK;
 273                         }
 274                         skb = skb2;
 275                 }
 276                 skb_put(skb, min_frame_size - skb->len);
 277         }
 278
 279         /* Send to right vcc */
 280         is_rdesc = 0;
 281         dst = lec_h->h_dest;
 282         entry = NULL;
 283         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 284         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 285                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 286         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 287                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 288                         pr_debug("%s:queuing packet, MAC address %pM\n",
 289                                  dev->name, lec_h->h_dest);
 290                         skb_queue_tail(&entry->tx_wait, skb);
 291                 } else {
 292                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 293                                  dev->name, lec_h->h_dest);
 294                         dev->stats.tx_dropped++;
 295                         dev_kfree_skb(skb);
 296                 }
 297                 goto out;
 298         }
 299 #if DUMP_PACKETS > 0
 300         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 301                dev->name, vcc->vpi, vcc->vci);
 302 #endif /* DUMP_PACKETS > 0 */
 303
 304         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 305                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 306                 lec_send(vcc, skb2);
 307         }
 308
 309         lec_send(vcc, skb);
 310
 311         if (!atm_may_send(vcc, 0)) {
 312                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 313
 314                 vpriv->xoff = 1;
 315                 netif_stop_queue(dev);
 316
 317                 /*
 318                  * vcc->pop() might have occurred in between, making
 319                  * the vcc usuable again.  Since xmit is serialized,
 320                  * this is the only situation we have to re-test.
 321                  */
 322
 323                 if (atm_may_send(vcc, 0))
 324                         netif_wake_queue(dev);
 325         }
 326
 327 out:
 328         if (entry)
 329                 lec_arp_put(entry);
 330         netif_trans_update(dev);
 331         return NETDEV_TX_OK;
 332 }
 333
 334 /* The inverse routine to net_open(). */
 335 static int lec_close(struct net_device *dev)
 336 {
 337         netif_stop_queue(dev);
 338         return 0;
 339 }
 340
 341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 342 {
 343         unsigned long flags;
 344         struct net_device *dev = (struct net_device *)vcc->proto_data;
 345         struct lec_priv *priv = netdev_priv(dev);
 346         struct atmlec_msg *mesg;
 347         struct lec_arp_table *entry;
 348         int i;
 349         char *tmp;              /* FIXME */
 350
 351         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 352         mesg = (struct atmlec_msg *)skb->data;
 353         tmp = skb->data;
 354         tmp += sizeof(struct atmlec_msg);
 355         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 356         switch (mesg->type) {
 357         case l_set_mac_addr:
 358                 for (i = 0; i < 6; i++)
 359                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 360                 break;
 361         case l_del_mac_addr:
 362                 for (i = 0; i < 6; i++)
 363                         dev->dev_addr[i] = 0;
 364                 break;
 365         case l_addr_delete:
 366                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 367                                 mesg->content.normal.flag);
 368                 break;
 369         case l_topology_change:
 370                 priv->topology_change = mesg->content.normal.flag;
 371                 break;
 372         case l_flush_complete:
 373                 lec_flush_complete(priv, mesg->content.normal.flag);
 374                 break;
 375         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 376                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 377                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 378                 lec_arp_remove(priv, entry);
 379                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 380
 381                 if (mesg->content.normal.no_source_le_narp)
 382                         break;
 383                 /* FALL THROUGH */
 384         case l_arp_update:
 385                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 386                                mesg->content.normal.atm_addr,
 387                                mesg->content.normal.flag,
 388                                mesg->content.normal.targetless_le_arp);
 389                 pr_debug("in l_arp_update\n");
 390                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 391                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 392                                  mesg->sizeoftlvs);
 393                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 394                                             tmp, mesg->sizeoftlvs);
 395                 }
 396                 break;
 397         case l_config:
 398                 priv->maximum_unknown_frame_count =
 399                     mesg->content.config.maximum_unknown_frame_count;
 400                 priv->max_unknown_frame_time =
 401                     (mesg->content.config.max_unknown_frame_time * HZ);
 402                 priv->max_retry_count = mesg->content.config.max_retry_count;
 403                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 404                 priv->forward_delay_time =
 405                     (mesg->content.config.forward_delay_time * HZ);
 406                 priv->arp_response_time =
 407                     (mesg->content.config.arp_response_time * HZ);
 408                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 409                 priv->path_switching_delay =
 410                     (mesg->content.config.path_switching_delay * HZ);
 411                 priv->lane_version = mesg->content.config.lane_version;
 412                                         /* LANE2 */
 413                 priv->lane2_ops = NULL;
 414                 if (priv->lane_version > 1)
 415                         priv->lane2_ops = &lane2_ops;
 416                 rtnl_lock();
 417                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 418                         pr_info("%s: change_mtu to %d failed\n",
 419                                 dev->name, mesg->content.config.mtu);
 420                 rtnl_unlock();
 421                 priv->is_proxy = mesg->content.config.is_proxy;
 422                 break;
 423         case l_flush_tran_id:
 424                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 425                                       mesg->content.normal.flag);
 426                 break;
 427         case l_set_lecid:
 428                 priv->lecid =
 429                     (unsigned short)(0xffff & mesg->content.normal.flag);
 430                 break;
 431         case l_should_bridge:
 432 #if IS_ENABLED(CONFIG_BRIDGE)
 433         {
 434                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 435                          dev->name, mesg->content.proxy.mac_addr);
 436
 437                 if (br_fdb_test_addr_hook == NULL)
 438                         break;
 439
 440                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 441                         /* hit from bridge table, send LE_ARP_RESPONSE */
 442                         struct sk_buff *skb2;
 443                         struct sock *sk;
 444
 445                         pr_debug("%s: entry found, responding to zeppelin\n",
 446                                  dev->name);
 447                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 448                         if (skb2 == NULL)
 449                                 break;
 450                         skb2->len = sizeof(struct atmlec_msg);
 451                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 452                         atm_force_charge(priv->lecd, skb2->truesize);
 453                         sk = sk_atm(priv->lecd);
 454                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 455                         sk->sk_data_ready(sk);
 456                 }
 457         }
 458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
 459                 break;
 460         default:
 461                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 462                 dev_kfree_skb(skb);
 463                 return -EINVAL;
 464         }
 465         dev_kfree_skb(skb);
 466         return 0;
 467 }
 468
 469 static void lec_atm_close(struct atm_vcc *vcc)
 470 {
 471         struct sk_buff *skb;
 472         struct net_device *dev = (struct net_device *)vcc->proto_data;
 473         struct lec_priv *priv = netdev_priv(dev);
 474
 475         priv->lecd = NULL;
 476         /* Do something needful? */
 477
 478         netif_stop_queue(dev);
 479         lec_arp_destroy(priv);
 480
 481         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 482                 pr_info("%s closing with messages pending\n", dev->name);
 483         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 484                 atm_return(vcc, skb->truesize);
 485                 dev_kfree_skb(skb);
 486         }
 487
 488         pr_info("%s: Shut down!\n", dev->name);
 489         module_put(THIS_MODULE);
 490 }
 491
 492 static const struct atmdev_ops lecdev_ops = {
 493         .close = lec_atm_close,
 494         .send = lec_atm_send
 495 };
 496
 497 static struct atm_dev lecatm_dev = {
 498         .ops = &lecdev_ops,
 499         .type = "lec",
 500         .number = 999,          /* dummy device number */
 501         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 502 };
 503
 504 /*
 505  * LANE2: new argument struct sk_buff *data contains
 506  * the LE_ARP based TLVs introduced in the LANE2 spec
 507  */
 508 static int
 509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 510              const unsigned char *mac_addr, const unsigned char *atm_addr,
 511              struct sk_buff *data)
 512 {
 513         struct sock *sk;
 514         struct sk_buff *skb;
 515         struct atmlec_msg *mesg;
 516
 517         if (!priv || !priv->lecd)
 518                 return -1;
 519         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 520         if (!skb)
 521                 return -1;
 522         skb->len = sizeof(struct atmlec_msg);
 523         mesg = (struct atmlec_msg *)skb->data;
 524         memset(mesg, 0, sizeof(struct atmlec_msg));
 525         mesg->type = type;
 526         if (data != NULL)
 527                 mesg->sizeoftlvs = data->len;
 528         if (mac_addr)
 529                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 530         else
 531                 mesg->content.normal.targetless_le_arp = 1;
 532         if (atm_addr)
 533                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 534
 535         atm_force_charge(priv->lecd, skb->truesize);
 536         sk = sk_atm(priv->lecd);
 537         skb_queue_tail(&sk->sk_receive_queue, skb);
 538         sk->sk_data_ready(sk);
 539
 540         if (data != NULL) {
 541                 pr_debug("about to send %d bytes of data\n", data->len);
 542                 atm_force_charge(priv->lecd, data->truesize);
 543                 skb_queue_tail(&sk->sk_receive_queue, data);
 544                 sk->sk_data_ready(sk);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static void lec_set_multicast_list(struct net_device *dev)
 551 {
 552         /*
 553          * by default, all multicast frames arrive over the bus.
 554          * eventually support selective multicast service
 555          */
 556 }
 557
 558 static const struct net_device_ops lec_netdev_ops = {
 559         .ndo_open               = lec_open,
 560         .ndo_stop               = lec_close,
 561         .ndo_start_xmit         = lec_start_xmit,
 562         .ndo_tx_timeout         = lec_tx_timeout,
 563         .ndo_set_rx_mode        = lec_set_multicast_list,
 564 };
 565
 566 static const unsigned char lec_ctrl_magic[] = {
 567         0xff,
 568         0x00,
 569         0x01,
 570         0x01
 571 };
 572
 573 #define LEC_DATA_DIRECT_8023  2
 574 #define LEC_DATA_DIRECT_8025  3
 575
 576 static int lec_is_data_direct(struct atm_vcc *vcc)
 577 {
 578         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 579                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 580 }
 581
 582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 583 {
 584         unsigned long flags;
 585         struct net_device *dev = (struct net_device *)vcc->proto_data;
 586         struct lec_priv *priv = netdev_priv(dev);
 587
 588 #if DUMP_PACKETS > 0
 589         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 590                dev->name, vcc->vpi, vcc->vci);
 591 #endif
 592         if (!skb) {
 593                 pr_debug("%s: null skb\n", dev->name);
 594                 lec_vcc_close(priv, vcc);
 595                 return;
 596         }
 597 #if DUMP_PACKETS >= 2
 598 #define MAX_SKB_DUMP 99
 599 #elif DUMP_PACKETS >= 1
 600 #define MAX_SKB_DUMP 30
 601 #endif
 602 #if DUMP_PACKETS > 0
 603         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 604                dev->name, skb->len, priv->lecid);
 605         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 606                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 607 #endif /* DUMP_PACKETS > 0 */
 608         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 609                                 /* Control frame, to daemon */
 610                 struct sock *sk = sk_atm(vcc);
 611
 612                 pr_debug("%s: To daemon\n", dev->name);
 613                 skb_queue_tail(&sk->sk_receive_queue, skb);
 614                 sk->sk_data_ready(sk);
 615         } else {                /* Data frame, queue to protocol handlers */
 616                 struct lec_arp_table *entry;
 617                 unsigned char *src, *dst;
 618
 619                 atm_return(vcc, skb->truesize);
 620                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 621                     !priv->lecd || !(dev->flags & IFF_UP)) {
 622                         /*
 623                          * Probably looping back, or if lecd is missing,
 624                          * lecd has gone down
 625                          */
 626                         pr_debug("Ignoring frame...\n");
 627                         dev_kfree_skb(skb);
 628                         return;
 629                 }
 630                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 631
 632                 /*
 633                  * If this is a Data Direct VCC, and the VCC does not match
 634                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 635                  */
 636                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 637                 if (lec_is_data_direct(vcc)) {
 638                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 639                         entry = lec_arp_find(priv, src);
 640                         if (entry && entry->vcc != vcc) {
 641                                 lec_arp_remove(priv, entry);
 642                                 lec_arp_put(entry);
 643                         }
 644                 }
 645                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 646
 647                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 648                     !priv->is_proxy &&  /* Proxy wants all the packets */
 649                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 650                         dev_kfree_skb(skb);
 651                         return;
 652                 }
 653                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 654                         lec_arp_check_empties(priv, vcc, skb);
 655                 skb_pull(skb, 2);       /* skip lec_id */
 656                 skb->protocol = eth_type_trans(skb, dev);
 657                 dev->stats.rx_packets++;
 658                 dev->stats.rx_bytes += skb->len;
 659                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 660                 netif_rx(skb);
 661         }
 662 }
 663
 664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 665 {
 666         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 667         struct net_device *dev = skb->dev;
 668
 669         if (vpriv == NULL) {
 670                 pr_info("vpriv = NULL!?!?!?\n");
 671                 return;
 672         }
 673
 674         vpriv->old_pop(vcc, skb);
 675
 676         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 677                 vpriv->xoff = 0;
 678                 if (netif_running(dev) && netif_queue_stopped(dev))
 679                         netif_wake_queue(dev);
 680         }
 681 }
 682
 683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 684 {
 685         struct lec_vcc_priv *vpriv;
 686         int bytes_left;
 687         struct atmlec_ioc ioc_data;
 688
 689         /* Lecd must be up in this case */
 690         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 691         if (bytes_left != 0)
 692                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 693         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 694                 return -EINVAL;
 695         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 696         if (!dev_lec[ioc_data.dev_num])
 697                 return -EINVAL;
 698         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 699         if (!vpriv)
 700                 return -ENOMEM;
 701         vpriv->xoff = 0;
 702         vpriv->old_pop = vcc->pop;
 703         vcc->user_back = vpriv;
 704         vcc->pop = lec_pop;
 705         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 706                       &ioc_data, vcc, vcc->push);
 707         vcc->proto_data = dev_lec[ioc_data.dev_num];
 708         vcc->push = lec_push;
 709         return 0;
 710 }
 711
 712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 713 {
 714         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 715                 return -EINVAL;
 716         vcc->proto_data = dev_lec[arg];
 717         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 718 }
 719
 720 /* Initialize device. */
 721 static int lecd_attach(struct atm_vcc *vcc, int arg)
 722 {
 723         int i;
 724         struct lec_priv *priv;
 725
 726         if (arg < 0)
 727                 i = 0;
 728         else
 729                 i = arg;
 730         if (arg >= MAX_LEC_ITF)
 731                 return -EINVAL;
 732         if (!dev_lec[i]) {
 733                 int size;
 734
 735                 size = sizeof(struct lec_priv);
 736                 dev_lec[i] = alloc_etherdev(size);
 737                 if (!dev_lec[i])
 738                         return -ENOMEM;
 739                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 740                 dev_lec[i]->max_mtu = 18190;
 741                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 742                 if (register_netdev(dev_lec[i])) {
 743                         free_netdev(dev_lec[i]);
 744                         return -EINVAL;
 745                 }
 746
 747                 priv = netdev_priv(dev_lec[i]);
 748         } else {
 749                 priv = netdev_priv(dev_lec[i]);
 750                 if (priv->lecd)
 751                         return -EADDRINUSE;
 752         }
 753         lec_arp_init(priv);
 754         priv->itfnum = i;       /* LANE2 addition */
 755         priv->lecd = vcc;
 756         vcc->dev = &lecatm_dev;
 757         vcc_insert_socket(sk_atm(vcc));
 758
 759         vcc->proto_data = dev_lec[i];
 760         set_bit(ATM_VF_META, &vcc->flags);
 761         set_bit(ATM_VF_READY, &vcc->flags);
 762
 763         /* Set default values to these variables */
 764         priv->maximum_unknown_frame_count = 1;
 765         priv->max_unknown_frame_time = (1 * HZ);
 766         priv->vcc_timeout_period = (1200 * HZ);
 767         priv->max_retry_count = 1;
 768         priv->aging_time = (300 * HZ);
 769         priv->forward_delay_time = (15 * HZ);
 770         priv->topology_change = 0;
 771         priv->arp_response_time = (1 * HZ);
 772         priv->flush_timeout = (4 * HZ);
 773         priv->path_switching_delay = (6 * HZ);
 774
 775         if (dev_lec[i]->flags & IFF_UP)
 776                 netif_start_queue(dev_lec[i]);
 777         __module_get(THIS_MODULE);
 778         return i;
 779 }
 780
 781 #ifdef CONFIG_PROC_FS
 782 static const char *lec_arp_get_status_string(unsigned char status)
 783 {
 784         static const char *const lec_arp_status_string[] = {
 785                 "ESI_UNKNOWN       ",
 786                 "ESI_ARP_PENDING   ",
 787                 "ESI_VC_PENDING    ",
 788                 "<Undefined>       ",
 789                 "ESI_FLUSH_PENDING ",
 790                 "ESI_FORWARD_DIRECT"
 791         };
 792
 793         if (status > ESI_FORWARD_DIRECT)
 794                 status = 3;     /* ESI_UNDEFINED */
 795         return lec_arp_status_string[status];
 796 }
 797
 798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 799 {
 800         int i;
 801
 802         for (i = 0; i < ETH_ALEN; i++)
 803                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 804         seq_printf(seq, " ");
 805         for (i = 0; i < ATM_ESA_LEN; i++)
 806                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 807         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 808                    entry->flags & 0xffff);
 809         if (entry->vcc)
 810                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 811         else
 812                 seq_printf(seq, "        ");
 813         if (entry->recv_vcc) {
 814                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 815                            entry->recv_vcc->vci);
 816         }
 817         seq_putc(seq, '\n');
 818 }
 819
 820 struct lec_state {
 821         unsigned long flags;
 822         struct lec_priv *locked;
 823         struct hlist_node *node;
 824         struct net_device *dev;
 825         int itf;
 826         int arp_table;
 827         int misc_table;
 828 };
 829
 830 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 831                           loff_t *l)
 832 {
 833         struct hlist_node *e = state->node;
 834
 835         if (!e)
 836                 e = tbl->first;
 837         if (e == SEQ_START_TOKEN) {
 838                 e = tbl->first;
 839                 --*l;
 840         }
 841
 842         for (; e; e = e->next) {
 843                 if (--*l < 0)
 844                         break;
 845         }
 846         state->node = e;
 847
 848         return (*l < 0) ? state : NULL;
 849 }
 850
 851 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 852                           struct lec_priv *priv)
 853 {
 854         void *v = NULL;
 855         int p;
 856
 857         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 858                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 859                 if (v)
 860                         break;
 861         }
 862         state->arp_table = p;
 863         return v;
 864 }
 865
 866 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 867                            struct lec_priv *priv)
 868 {
 869         struct hlist_head *lec_misc_tables[] = {
 870                 &priv->lec_arp_empty_ones,
 871                 &priv->lec_no_forward,
 872                 &priv->mcast_fwds
 873         };
 874         void *v = NULL;
 875         int q;
 876
 877         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 878                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 879                 if (v)
 880                         break;
 881         }
 882         state->misc_table = q;
 883         return v;
 884 }
 885
 886 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 887                            struct lec_priv *priv)
 888 {
 889         if (!state->locked) {
 890                 state->locked = priv;
 891                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 892         }
 893         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 894                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 895                 state->locked = NULL;
 896                 /* Partial state reset for the next time we get called */
 897                 state->arp_table = state->misc_table = 0;
 898         }
 899         return state->locked;
 900 }
 901
 902 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 903 {
 904         struct net_device *dev;
 905         void *v;
 906
 907         dev = state->dev ? state->dev : dev_lec[state->itf];
 908         v = (dev && netdev_priv(dev)) ?
 909                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 910         if (!v && dev) {
 911                 dev_put(dev);
 912                 /* Partial state reset for the next time we get called */
 913                 dev = NULL;
 914         }
 915         state->dev = dev;
 916         return v;
 917 }
 918
 919 static void *lec_get_idx(struct lec_state *state, loff_t l)
 920 {
 921         void *v = NULL;
 922
 923         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 924                 v = lec_itf_walk(state, &l);
 925                 if (v)
 926                         break;
 927         }
 928         return v;
 929 }
 930
 931 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 932 {
 933         struct lec_state *state = seq->private;
 934
 935         state->itf = 0;
 936         state->dev = NULL;
 937         state->locked = NULL;
 938         state->arp_table = 0;
 939         state->misc_table = 0;
 940         state->node = SEQ_START_TOKEN;
 941
 942         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 943 }
 944
 945 static void lec_seq_stop(struct seq_file *seq, void *v)
 946 {
 947         struct lec_state *state = seq->private;
 948
 949         if (state->dev) {
 950                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 951                                        state->flags);
 952                 dev_put(state->dev);
 953         }
 954 }
 955
 956 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 957 {
 958         struct lec_state *state = seq->private;
 959
 960         v = lec_get_idx(state, 1);
 961         *pos += !!PTR_ERR(v);
 962         return v;
 963 }
 964
 965 static int lec_seq_show(struct seq_file *seq, void *v)
 966 {
 967         static const char lec_banner[] =
 968             "Itf  MAC          ATM destination"
 969             "                          Status            Flags "
 970             "VPI/VCI Recv VPI/VCI\n";
 971
 972         if (v == SEQ_START_TOKEN)
 973                 seq_puts(seq, lec_banner);
 974         else {
 975                 struct lec_state *state = seq->private;
 976                 struct net_device *dev = state->dev;
 977                 struct lec_arp_table *entry = hlist_entry(state->node,
 978                                                           struct lec_arp_table,
 979                                                           next);
 980
 981                 seq_printf(seq, "%s ", dev->name);
 982                 lec_info(seq, entry);
 983         }
 984         return 0;
 985 }
 986
 987 static const struct seq_operations lec_seq_ops = {
 988         .start = lec_seq_start,
 989         .next = lec_seq_next,
 990         .stop = lec_seq_stop,
 991         .show = lec_seq_show,
 992 };
 993 #endif
 994
 995 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 996 {
 997         struct atm_vcc *vcc = ATM_SD(sock);
 998         int err = 0;
 999
1000         switch (cmd) {
1001         case ATMLEC_CTRL:
1002         case ATMLEC_MCAST:
1003         case ATMLEC_DATA:
1004                 if (!capable(CAP_NET_ADMIN))
1005                         return -EPERM;
1006                 break;
1007         default:
1008                 return -ENOIOCTLCMD;
1009         }
1010
1011         switch (cmd) {
1012         case ATMLEC_CTRL:
1013                 err = lecd_attach(vcc, (int)arg);
1014                 if (err >= 0)
1015                         sock->state = SS_CONNECTED;
1016                 break;
1017         case ATMLEC_MCAST:
1018                 err = lec_mcast_attach(vcc, (int)arg);
1019                 break;
1020         case ATMLEC_DATA:
1021                 err = lec_vcc_attach(vcc, (void __user *)arg);
1022                 break;
1023         }
1024
1025         return err;
1026 }
1027
1028 static struct atm_ioctl lane_ioctl_ops = {
1029         .owner = THIS_MODULE,
1030         .ioctl = lane_ioctl,
1031 };
1032
1033 static int __init lane_module_init(void)
1034 {
1035 #ifdef CONFIG_PROC_FS
1036         struct proc_dir_entry *p;
1037
1038         p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1039                         sizeof(struct lec_state), NULL);
1040         if (!p) {
1041                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1042                 return -ENOMEM;
1043         }
1044 #endif
1045
1046         register_atm_ioctl(&lane_ioctl_ops);
1047         pr_info("lec.c: initialized\n");
1048         return 0;
1049 }
1050
1051 static void __exit lane_module_cleanup(void)
1052 {
1053         int i;
1054
1055 #ifdef CONFIG_PROC_FS
1056         remove_proc_entry("lec", atm_proc_root);
1057 #endif
1058
1059         deregister_atm_ioctl(&lane_ioctl_ops);
1060
1061         for (i = 0; i < MAX_LEC_ITF; i++) {
1062                 if (dev_lec[i] != NULL) {
1063                         unregister_netdev(dev_lec[i]);
1064                         free_netdev(dev_lec[i]);
1065                         dev_lec[i] = NULL;
1066                 }
1067         }
1068 }
1069
1070 module_init(lane_module_init);
1071 module_exit(lane_module_cleanup);
1072
1073 /*
1074  * LANE2: 3.1.3, LE_RESOLVE.request
1075  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1076  * If sizeoftlvs == NULL the default TLVs associated with with this
1077  * lec will be used.
1078  * If dst_mac == NULL, targetless LE_ARP will be sent
1079  */
1080 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1081                          u8 **tlvs, u32 *sizeoftlvs)
1082 {
1083         unsigned long flags;
1084         struct lec_priv *priv = netdev_priv(dev);
1085         struct lec_arp_table *table;
1086         struct sk_buff *skb;
1087         int retval;
1088
1089         if (force == 0) {
1090                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1091                 table = lec_arp_find(priv, dst_mac);
1092                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1093                 if (table == NULL)
1094                         return -1;
1095
1096                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1097                 if (*tlvs == NULL)
1098                         return -1;
1099
1100                 *sizeoftlvs = table->sizeoftlvs;
1101
1102                 return 0;
1103         }
1104
1105         if (sizeoftlvs == NULL)
1106                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1107
1108         else {
1109                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1110                 if (skb == NULL)
1111                         return -1;
1112                 skb->len = *sizeoftlvs;
1113                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1114                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1115         }
1116         return retval;
1117 }
1118
1119 /*
1120  * LANE2: 3.1.4, LE_ASSOCIATE.request
1121  * Associate the *tlvs with the *lan_dst address.
1122  * Will overwrite any previous association
1123  * Returns 1 for success, 0 for failure (out of memory)
1124  *
1125  */
1126 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1127                                const u8 *tlvs, u32 sizeoftlvs)
1128 {
1129         int retval;
1130         struct sk_buff *skb;
1131         struct lec_priv *priv = netdev_priv(dev);
1132
1133         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1134                 return 0;       /* not our mac address */
1135
1136         kfree(priv->tlvs);      /* NULL if there was no previous association */
1137
1138         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1139         if (priv->tlvs == NULL)
1140                 return 0;
1141         priv->sizeoftlvs = sizeoftlvs;
1142
1143         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1144         if (skb == NULL)
1145                 return 0;
1146         skb->len = sizeoftlvs;
1147         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1148         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1149         if (retval != 0)
1150                 pr_info("lec.c: lane2_associate_req() failed\n");
1151         /*
1152          * If the previous association has changed we must
1153          * somehow notify other LANE entities about the change
1154          */
1155         return 1;
1156 }
1157
1158 /*
1159  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1160  *
1161  */
1162 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1163                                 const u8 *tlvs, u32 sizeoftlvs)
1164 {
1165 #if 0
1166         int i = 0;
1167 #endif
1168         struct lec_priv *priv = netdev_priv(dev);
1169 #if 0                           /*
1170                                  * Why have the TLVs in LE_ARP entries
1171                                  * since we do not use them? When you
1172                                  * uncomment this code, make sure the
1173                                  * TLVs get freed when entry is killed
1174                                  */
1175         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1176
1177         if (entry == NULL)
1178                 return;         /* should not happen */
1179
1180         kfree(entry->tlvs);
1181
1182         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1183         if (entry->tlvs == NULL)
1184                 return;
1185         entry->sizeoftlvs = sizeoftlvs;
1186 #endif
1187 #if 0
1188         pr_info("\n");
1189         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1190         while (i < sizeoftlvs)
1191                 pr_cont("%02x ", tlvs[i++]);
1192
1193         pr_cont("\n");
1194 #endif
1195
1196         /* tell MPOA about the TLVs we saw */
1197         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1198                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1199                                                      tlvs, sizeoftlvs);
1200         }
1201 }
1202
1203 /*
1204  * Here starts what used to lec_arpc.c
1205  *
1206  * lec_arpc.c was added here when making
1207  * lane client modular. October 1997
1208  */
1209
1210 #include <linux/types.h>
1211 #include <linux/timer.h>
1212 #include <linux/param.h>
1213 #include <linux/atomic.h>
1214 #include <linux/inetdevice.h>
1215 #include <net/route.h>
1216
1217 #if 0
1218 #define pr_debug(format, args...)
1219 /*
1220   #define pr_debug printk
1221 */
1222 #endif
1223 #define DEBUG_ARP_TABLE 0
1224
1225 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1226
1227 static void lec_arp_check_expire(struct work_struct *work);
1228 static void lec_arp_expire_arp(struct timer_list *t);
1229
1230 /*
1231  * Arp table funcs
1232  */
1233
1234 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1235
1236 /*
1237  * Initialization of arp-cache
1238  */
1239 static void lec_arp_init(struct lec_priv *priv)
1240 {
1241         unsigned short i;
1242
1243         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1244                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1245         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1246         INIT_HLIST_HEAD(&priv->lec_no_forward);
1247         INIT_HLIST_HEAD(&priv->mcast_fwds);
1248         spin_lock_init(&priv->lec_arp_lock);
1249         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1250         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1251 }
1252
1253 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1254 {
1255         if (entry->vcc) {
1256                 struct atm_vcc *vcc = entry->vcc;
1257                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1258                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1259
1260                 vcc->pop = vpriv->old_pop;
1261                 if (vpriv->xoff)
1262                         netif_wake_queue(dev);
1263                 kfree(vpriv);
1264                 vcc->user_back = NULL;
1265                 vcc->push = entry->old_push;
1266                 vcc_release_async(vcc, -EPIPE);
1267                 entry->vcc = NULL;
1268         }
1269         if (entry->recv_vcc) {
1270                 entry->recv_vcc->push = entry->old_recv_push;
1271                 vcc_release_async(entry->recv_vcc, -EPIPE);
1272                 entry->recv_vcc = NULL;
1273         }
1274 }
1275
1276 /*
1277  * Insert entry to lec_arp_table
1278  * LANE2: Add to the end of the list to satisfy 8.1.13
1279  */
1280 static inline void
1281 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1282 {
1283         struct hlist_head *tmp;
1284
1285         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1286         hlist_add_head(&entry->next, tmp);
1287
1288         pr_debug("Added entry:%pM\n", entry->mac_addr);
1289 }
1290
1291 /*
1292  * Remove entry from lec_arp_table
1293  */
1294 static int
1295 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1296 {
1297         struct lec_arp_table *entry;
1298         int i, remove_vcc = 1;
1299
1300         if (!to_remove)
1301                 return -1;
1302
1303         hlist_del(&to_remove->next);
1304         del_timer(&to_remove->timer);
1305
1306         /*
1307          * If this is the only MAC connected to this VCC,
1308          * also tear down the VCC
1309          */
1310         if (to_remove->status >= ESI_FLUSH_PENDING) {
1311                 /*
1312                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1313                  */
1314                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1315                         hlist_for_each_entry(entry,
1316                                              &priv->lec_arp_tables[i], next) {
1317                                 if (memcmp(to_remove->atm_addr,
1318                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1319                                         remove_vcc = 0;
1320                                         break;
1321                                 }
1322                         }
1323                 }
1324                 if (remove_vcc)
1325                         lec_arp_clear_vccs(to_remove);
1326         }
1327         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1328
1329         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1330         return 0;
1331 }
1332
1333 #if DEBUG_ARP_TABLE
1334 static const char *get_status_string(unsigned char st)
1335 {
1336         switch (st) {
1337         case ESI_UNKNOWN:
1338                 return "ESI_UNKNOWN";
1339         case ESI_ARP_PENDING:
1340                 return "ESI_ARP_PENDING";
1341         case ESI_VC_PENDING:
1342                 return "ESI_VC_PENDING";
1343         case ESI_FLUSH_PENDING:
1344                 return "ESI_FLUSH_PENDING";
1345         case ESI_FORWARD_DIRECT:
1346                 return "ESI_FORWARD_DIRECT";
1347         }
1348         return "<UNKNOWN>";
1349 }
1350
1351 static void dump_arp_table(struct lec_priv *priv)
1352 {
1353         struct lec_arp_table *rulla;
1354         char buf[256];
1355         int i, j, offset;
1356
1357         pr_info("Dump %p:\n", priv);
1358         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1359                 hlist_for_each_entry(rulla,
1360                                      &priv->lec_arp_tables[i], next) {
1361                         offset = 0;
1362                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1363                         offset += sprintf(buf + offset, "Mac: %pM",
1364                                           rulla->mac_addr);
1365                         offset += sprintf(buf + offset, " Atm:");
1366                         for (j = 0; j < ATM_ESA_LEN; j++) {
1367                                 offset += sprintf(buf + offset,
1368                                                   "%2.2x ",
1369                                                   rulla->atm_addr[j] & 0xff);
1370                         }
1371                         offset += sprintf(buf + offset,
1372                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1373                                           rulla->vcc ? rulla->vcc->vpi : 0,
1374                                           rulla->vcc ? rulla->vcc->vci : 0,
1375                                           rulla->recv_vcc ? rulla->recv_vcc->
1376                                           vpi : 0,
1377                                           rulla->recv_vcc ? rulla->recv_vcc->
1378                                           vci : 0, rulla->last_used,
1379                                           rulla->timestamp, rulla->no_tries);
1380                         offset +=
1381                             sprintf(buf + offset,
1382                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1383                                     rulla->flags, rulla->packets_flooded,
1384                                     get_status_string(rulla->status));
1385                         pr_info("%s\n", buf);
1386                 }
1387         }
1388
1389         if (!hlist_empty(&priv->lec_no_forward))
1390                 pr_info("No forward\n");
1391         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1392                 offset = 0;
1393                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1394                 offset += sprintf(buf + offset, " Atm:");
1395                 for (j = 0; j < ATM_ESA_LEN; j++) {
1396                         offset += sprintf(buf + offset, "%2.2x ",
1397                                           rulla->atm_addr[j] & 0xff);
1398                 }
1399                 offset += sprintf(buf + offset,
1400                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1401                                   rulla->vcc ? rulla->vcc->vpi : 0,
1402                                   rulla->vcc ? rulla->vcc->vci : 0,
1403                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1404                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1405                                   rulla->last_used,
1406                                   rulla->timestamp, rulla->no_tries);
1407                 offset += sprintf(buf + offset,
1408                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1409                                   rulla->flags, rulla->packets_flooded,
1410                                   get_status_string(rulla->status));
1411                 pr_info("%s\n", buf);
1412         }
1413
1414         if (!hlist_empty(&priv->lec_arp_empty_ones))
1415                 pr_info("Empty ones\n");
1416         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1417                 offset = 0;
1418                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1419                 offset += sprintf(buf + offset, " Atm:");
1420                 for (j = 0; j < ATM_ESA_LEN; j++) {
1421                         offset += sprintf(buf + offset, "%2.2x ",
1422                                           rulla->atm_addr[j] & 0xff);
1423                 }
1424                 offset += sprintf(buf + offset,
1425                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1426                                   rulla->vcc ? rulla->vcc->vpi : 0,
1427                                   rulla->vcc ? rulla->vcc->vci : 0,
1428                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1429                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1430                                   rulla->last_used,
1431                                   rulla->timestamp, rulla->no_tries);
1432                 offset += sprintf(buf + offset,
1433                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1434                                   rulla->flags, rulla->packets_flooded,
1435                                   get_status_string(rulla->status));
1436                 pr_info("%s", buf);
1437         }
1438
1439         if (!hlist_empty(&priv->mcast_fwds))
1440                 pr_info("Multicast Forward VCCs\n");
1441         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1442                 offset = 0;
1443                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1444                 offset += sprintf(buf + offset, " Atm:");
1445                 for (j = 0; j < ATM_ESA_LEN; j++) {
1446                         offset += sprintf(buf + offset, "%2.2x ",
1447                                           rulla->atm_addr[j] & 0xff);
1448                 }
1449                 offset += sprintf(buf + offset,
1450                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1451                                   rulla->vcc ? rulla->vcc->vpi : 0,
1452                                   rulla->vcc ? rulla->vcc->vci : 0,
1453                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1454                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1455                                   rulla->last_used,
1456                                   rulla->timestamp, rulla->no_tries);
1457                 offset += sprintf(buf + offset,
1458                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1459                                   rulla->flags, rulla->packets_flooded,
1460                                   get_status_string(rulla->status));
1461                 pr_info("%s\n", buf);
1462         }
1463
1464 }
1465 #else
1466 #define dump_arp_table(priv) do { } while (0)
1467 #endif
1468
1469 /*
1470  * Destruction of arp-cache
1471  */
1472 static void lec_arp_destroy(struct lec_priv *priv)
1473 {
1474         unsigned long flags;
1475         struct hlist_node *next;
1476         struct lec_arp_table *entry;
1477         int i;
1478
1479         cancel_delayed_work_sync(&priv->lec_arp_work);
1480
1481         /*
1482          * Remove all entries
1483          */
1484
1485         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1486         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1487                 hlist_for_each_entry_safe(entry, next,
1488                                           &priv->lec_arp_tables[i], next) {
1489                         lec_arp_remove(priv, entry);
1490                         lec_arp_put(entry);
1491                 }
1492                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1493         }
1494
1495         hlist_for_each_entry_safe(entry, next,
1496                                   &priv->lec_arp_empty_ones, next) {
1497                 del_timer_sync(&entry->timer);
1498                 lec_arp_clear_vccs(entry);
1499                 hlist_del(&entry->next);
1500                 lec_arp_put(entry);
1501         }
1502         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1503
1504         hlist_for_each_entry_safe(entry, next,
1505                                   &priv->lec_no_forward, next) {
1506                 del_timer_sync(&entry->timer);
1507                 lec_arp_clear_vccs(entry);
1508                 hlist_del(&entry->next);
1509                 lec_arp_put(entry);
1510         }
1511         INIT_HLIST_HEAD(&priv->lec_no_forward);
1512
1513         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1514                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1515                 lec_arp_clear_vccs(entry);
1516                 hlist_del(&entry->next);
1517                 lec_arp_put(entry);
1518         }
1519         INIT_HLIST_HEAD(&priv->mcast_fwds);
1520         priv->mcast_vcc = NULL;
1521         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1522 }
1523
1524 /*
1525  * Find entry by mac_address
1526  */
1527 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1528                                           const unsigned char *mac_addr)
1529 {
1530         struct hlist_head *head;
1531         struct lec_arp_table *entry;
1532
1533         pr_debug("%pM\n", mac_addr);
1534
1535         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1536         hlist_for_each_entry(entry, head, next) {
1537                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1538                         return entry;
1539         }
1540         return NULL;
1541 }
1542
1543 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1544                                         const unsigned char *mac_addr)
1545 {
1546         struct lec_arp_table *to_return;
1547
1548         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1549         if (!to_return) {
1550                 pr_info("LEC: Arp entry kmalloc failed\n");
1551                 return NULL;
1552         }
1553         ether_addr_copy(to_return->mac_addr, mac_addr);
1554         INIT_HLIST_NODE(&to_return->next);
1555         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1556         to_return->last_used = jiffies;
1557         to_return->priv = priv;
1558         skb_queue_head_init(&to_return->tx_wait);
1559         refcount_set(&to_return->usage, 1);
1560         return to_return;
1561 }
1562
1563 /* Arp sent timer expired */
1564 static void lec_arp_expire_arp(struct timer_list *t)
1565 {
1566         struct lec_arp_table *entry;
1567
1568         entry = from_timer(entry, t, timer);
1569
1570         pr_debug("\n");
1571         if (entry->status == ESI_ARP_PENDING) {
1572                 if (entry->no_tries <= entry->priv->max_retry_count) {
1573                         if (entry->is_rdesc)
1574                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1575                                              entry->mac_addr, NULL, NULL);
1576                         else
1577                                 send_to_lecd(entry->priv, l_arp_xmt,
1578                                              entry->mac_addr, NULL, NULL);
1579                         entry->no_tries++;
1580                 }
1581                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1582         }
1583 }
1584
1585 /* Unknown/unused vcc expire, remove associated entry */
1586 static void lec_arp_expire_vcc(struct timer_list *t)
1587 {
1588         unsigned long flags;
1589         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1590         struct lec_priv *priv = to_remove->priv;
1591
1592         del_timer(&to_remove->timer);
1593
1594         pr_debug("%p %p: vpi:%d vci:%d\n",
1595                  to_remove, priv,
1596                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1597                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1598
1599         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1600         hlist_del(&to_remove->next);
1601         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1602
1603         lec_arp_clear_vccs(to_remove);
1604         lec_arp_put(to_remove);
1605 }
1606
1607 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1608                                    unsigned long now,
1609                                    struct lec_priv *priv)
1610 {
1611         unsigned long time_to_check;
1612
1613         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1614                 time_to_check = priv->forward_delay_time;
1615         else
1616                 time_to_check = priv->aging_time;
1617
1618         pr_debug("About to expire: %lx - %lx > %lx\n",
1619                  now, entry->last_used, time_to_check);
1620         if (time_after(now, entry->last_used + time_to_check) &&
1621             !(entry->flags & LEC_PERMANENT_FLAG) &&
1622             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1623                 /* Remove entry */
1624                 pr_debug("Entry timed out\n");
1625                 lec_arp_remove(priv, entry);
1626                 lec_arp_put(entry);
1627         } else {
1628                 /* Something else */
1629                 if ((entry->status == ESI_VC_PENDING ||
1630                      entry->status == ESI_ARP_PENDING) &&
1631                     time_after_eq(now, entry->timestamp +
1632                                        priv->max_unknown_frame_time)) {
1633                         entry->timestamp = jiffies;
1634                         entry->packets_flooded = 0;
1635                         if (entry->status == ESI_VC_PENDING)
1636                                 send_to_lecd(priv, l_svc_setup,
1637                                              entry->mac_addr,
1638                                              entry->atm_addr,
1639                                              NULL);
1640                 }
1641                 if (entry->status == ESI_FLUSH_PENDING &&
1642                     time_after_eq(now, entry->timestamp +
1643                                        priv->path_switching_delay)) {
1644                         lec_arp_hold(entry);
1645                         return true;
1646                 }
1647         }
1648
1649         return false;
1650 }
1651 /*
1652  * Expire entries.
1653  * 1. Re-set timer
1654  * 2. For each entry, delete entries that have aged past the age limit.
1655  * 3. For each entry, depending on the status of the entry, perform
1656  *    the following maintenance.
1657  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1658  *       tick_count is above the max_unknown_frame_time, clear
1659  *       the tick_count to zero and clear the packets_flooded counter
1660  *       to zero. This supports the packet rate limit per address
1661  *       while flooding unknowns.
1662  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1663  *       than or equal to the path_switching_delay, change the status
1664  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1665  *       regardless of the progress of the flush protocol.
1666  */
1667 static void lec_arp_check_expire(struct work_struct *work)
1668 {
1669         unsigned long flags;
1670         struct lec_priv *priv =
1671                 container_of(work, struct lec_priv, lec_arp_work.work);
1672         struct hlist_node *next;
1673         struct lec_arp_table *entry;
1674         unsigned long now;
1675         int i;
1676
1677         pr_debug("%p\n", priv);
1678         now = jiffies;
1679 restart:
1680         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1681         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1682                 hlist_for_each_entry_safe(entry, next,
1683                                           &priv->lec_arp_tables[i], next) {
1684                         if (__lec_arp_check_expire(entry, now, priv)) {
1685                                 struct sk_buff *skb;
1686                                 struct atm_vcc *vcc = entry->vcc;
1687
1688                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1689                                                        flags);
1690                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1691                                         lec_send(vcc, skb);
1692                                 entry->last_used = jiffies;
1693                                 entry->status = ESI_FORWARD_DIRECT;
1694                                 lec_arp_put(entry);
1695
1696                                 goto restart;
1697                         }
1698                 }
1699         }
1700         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1701
1702         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1703 }
1704
1705 /*
1706  * Try to find vcc where mac_address is attached.
1707  *
1708  */
1709 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1710                                        const unsigned char *mac_to_find,
1711                                        int is_rdesc,
1712                                        struct lec_arp_table **ret_entry)
1713 {
1714         unsigned long flags;
1715         struct lec_arp_table *entry;
1716         struct atm_vcc *found;
1717
1718         if (mac_to_find[0] & 0x01) {
1719                 switch (priv->lane_version) {
1720                 case 1:
1721                         return priv->mcast_vcc;
1722                 case 2: /* LANE2 wants arp for multicast addresses */
1723                         if (ether_addr_equal(mac_to_find, bus_mac))
1724                                 return priv->mcast_vcc;
1725                         break;
1726                 default:
1727                         break;
1728                 }
1729         }
1730
1731         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1732         entry = lec_arp_find(priv, mac_to_find);
1733
1734         if (entry) {
1735                 if (entry->status == ESI_FORWARD_DIRECT) {
1736                         /* Connection Ok */
1737                         entry->last_used = jiffies;
1738                         lec_arp_hold(entry);
1739                         *ret_entry = entry;
1740                         found = entry->vcc;
1741                         goto out;
1742                 }
1743                 /*
1744                  * If the LE_ARP cache entry is still pending, reset count to 0
1745                  * so another LE_ARP request can be made for this frame.
1746                  */
1747                 if (entry->status == ESI_ARP_PENDING)
1748                         entry->no_tries = 0;
1749                 /*
1750                  * Data direct VC not yet set up, check to see if the unknown
1751                  * frame count is greater than the limit. If the limit has
1752                  * not been reached, allow the caller to send packet to
1753                  * BUS.
1754                  */
1755                 if (entry->status != ESI_FLUSH_PENDING &&
1756                     entry->packets_flooded <
1757                     priv->maximum_unknown_frame_count) {
1758                         entry->packets_flooded++;
1759                         pr_debug("Flooding..\n");
1760                         found = priv->mcast_vcc;
1761                         goto out;
1762                 }
1763                 /*
1764                  * We got here because entry->status == ESI_FLUSH_PENDING
1765                  * or BUS flood limit was reached for an entry which is
1766                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1767                  */
1768                 lec_arp_hold(entry);
1769                 *ret_entry = entry;
1770                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1771                          entry->vcc);
1772                 found = NULL;
1773         } else {
1774                 /* No matching entry was found */
1775                 entry = make_entry(priv, mac_to_find);
1776                 pr_debug("Making entry\n");
1777                 if (!entry) {
1778                         found = priv->mcast_vcc;
1779                         goto out;
1780                 }
1781                 lec_arp_add(priv, entry);
1782                 /* We want arp-request(s) to be sent */
1783                 entry->packets_flooded = 1;
1784                 entry->status = ESI_ARP_PENDING;
1785                 entry->no_tries = 1;
1786                 entry->last_used = entry->timestamp = jiffies;
1787                 entry->is_rdesc = is_rdesc;
1788                 if (entry->is_rdesc)
1789                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1790                                      NULL);
1791                 else
1792                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1793                 entry->timer.expires = jiffies + (1 * HZ);
1794                 entry->timer.function = lec_arp_expire_arp;
1795                 add_timer(&entry->timer);
1796                 found = priv->mcast_vcc;
1797         }
1798
1799 out:
1800         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1801         return found;
1802 }
1803
1804 static int
1805 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1806                 unsigned long permanent)
1807 {
1808         unsigned long flags;
1809         struct hlist_node *next;
1810         struct lec_arp_table *entry;
1811         int i;
1812
1813         pr_debug("\n");
1814         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1815         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1816                 hlist_for_each_entry_safe(entry, next,
1817                                           &priv->lec_arp_tables[i], next) {
1818                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1819                             (permanent ||
1820                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1821                                 lec_arp_remove(priv, entry);
1822                                 lec_arp_put(entry);
1823                         }
1824                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1825                         return 0;
1826                 }
1827         }
1828         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1829         return -1;
1830 }
1831
1832 /*
1833  * Notifies:  Response to arp_request (atm_addr != NULL)
1834  */
1835 static void
1836 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1837                const unsigned char *atm_addr, unsigned long remoteflag,
1838                unsigned int targetless_le_arp)
1839 {
1840         unsigned long flags;
1841         struct hlist_node *next;
1842         struct lec_arp_table *entry, *tmp;
1843         int i;
1844
1845         pr_debug("%smac:%pM\n",
1846                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1847
1848         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1849         entry = lec_arp_find(priv, mac_addr);
1850         if (entry == NULL && targetless_le_arp)
1851                 goto out;       /*
1852                                  * LANE2: ignore targetless LE_ARPs for which
1853                                  * we have no entry in the cache. 7.1.30
1854                                  */
1855         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1856                 hlist_for_each_entry_safe(entry, next,
1857                                           &priv->lec_arp_empty_ones, next) {
1858                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1859                                 hlist_del(&entry->next);
1860                                 del_timer(&entry->timer);
1861                                 tmp = lec_arp_find(priv, mac_addr);
1862                                 if (tmp) {
1863                                         del_timer(&tmp->timer);
1864                                         tmp->status = ESI_FORWARD_DIRECT;
1865                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1866                                         tmp->vcc = entry->vcc;
1867                                         tmp->old_push = entry->old_push;
1868                                         tmp->last_used = jiffies;
1869                                         del_timer(&entry->timer);
1870                                         lec_arp_put(entry);
1871                                         entry = tmp;
1872                                 } else {
1873                                         entry->status = ESI_FORWARD_DIRECT;
1874                                         ether_addr_copy(entry->mac_addr,
1875                                                         mac_addr);
1876                                         entry->last_used = jiffies;
1877                                         lec_arp_add(priv, entry);
1878                                 }
1879                                 if (remoteflag)
1880                                         entry->flags |= LEC_REMOTE_FLAG;
1881                                 else
1882                                         entry->flags &= ~LEC_REMOTE_FLAG;
1883                                 pr_debug("After update\n");
1884                                 dump_arp_table(priv);
1885                                 goto out;
1886                         }
1887                 }
1888         }
1889
1890         entry = lec_arp_find(priv, mac_addr);
1891         if (!entry) {
1892                 entry = make_entry(priv, mac_addr);
1893                 if (!entry)
1894                         goto out;
1895                 entry->status = ESI_UNKNOWN;
1896                 lec_arp_add(priv, entry);
1897                 /* Temporary, changes before end of function */
1898         }
1899         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1900         del_timer(&entry->timer);
1901         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1902                 hlist_for_each_entry(tmp,
1903                                      &priv->lec_arp_tables[i], next) {
1904                         if (entry != tmp &&
1905                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1906                                 /* Vcc to this host exists */
1907                                 if (tmp->status > ESI_VC_PENDING) {
1908                                         /*
1909                                          * ESI_FLUSH_PENDING,
1910                                          * ESI_FORWARD_DIRECT
1911                                          */
1912                                         entry->vcc = tmp->vcc;
1913                                         entry->old_push = tmp->old_push;
1914                                 }
1915                                 entry->status = tmp->status;
1916                                 break;
1917                         }
1918                 }
1919         }
1920         if (remoteflag)
1921                 entry->flags |= LEC_REMOTE_FLAG;
1922         else
1923                 entry->flags &= ~LEC_REMOTE_FLAG;
1924         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1925                 entry->status = ESI_VC_PENDING;
1926                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1927         }
1928         pr_debug("After update2\n");
1929         dump_arp_table(priv);
1930 out:
1931         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1932 }
1933
1934 /*
1935  * Notifies: Vcc setup ready
1936  */
1937 static void
1938 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1939               struct atm_vcc *vcc,
1940               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1941 {
1942         unsigned long flags;
1943         struct lec_arp_table *entry;
1944         int i, found_entry = 0;
1945
1946         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1947         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1948         if (ioc_data->receive == 2) {
1949                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1950 #if 0
1951                 entry = lec_arp_find(priv, bus_mac);
1952                 if (!entry) {
1953                         pr_info("LEC_ARP: Multicast entry not found!\n");
1954                         goto out;
1955                 }
1956                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1957                 entry->recv_vcc = vcc;
1958                 entry->old_recv_push = old_push;
1959 #endif
1960                 entry = make_entry(priv, bus_mac);
1961                 if (entry == NULL)
1962                         goto out;
1963                 del_timer(&entry->timer);
1964                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1965                 entry->recv_vcc = vcc;
1966                 entry->old_recv_push = old_push;
1967                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1968                 goto out;
1969         } else if (ioc_data->receive == 1) {
1970                 /*
1971                  * Vcc which we don't want to make default vcc,
1972                  * attach it anyway.
1973                  */
1974                 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",
1975                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1976                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1977                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1978                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1979                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1980                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1981                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1982                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1983                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1984                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1985                 entry = make_entry(priv, bus_mac);
1986                 if (entry == NULL)
1987                         goto out;
1988                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1989                 eth_zero_addr(entry->mac_addr);
1990                 entry->recv_vcc = vcc;
1991                 entry->old_recv_push = old_push;
1992                 entry->status = ESI_UNKNOWN;
1993                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1994                 entry->timer.function = lec_arp_expire_vcc;
1995                 hlist_add_head(&entry->next, &priv->lec_no_forward);
1996                 add_timer(&entry->timer);
1997                 dump_arp_table(priv);
1998                 goto out;
1999         }
2000         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",
2001                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2002                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2003                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2004                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2005                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2006                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2007                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2008                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2009                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2010                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2011         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2012                 hlist_for_each_entry(entry,
2013                                      &priv->lec_arp_tables[i], next) {
2014                         if (memcmp
2015                             (ioc_data->atm_addr, entry->atm_addr,
2016                              ATM_ESA_LEN) == 0) {
2017                                 pr_debug("LEC_ARP: Attaching data direct\n");
2018                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2019                                          entry->vcc ? entry->vcc->vci : 0,
2020                                          entry->recv_vcc ? entry->recv_vcc->
2021                                          vci : 0);
2022                                 found_entry = 1;
2023                                 del_timer(&entry->timer);
2024                                 entry->vcc = vcc;
2025                                 entry->old_push = old_push;
2026                                 if (entry->status == ESI_VC_PENDING) {
2027                                         if (priv->maximum_unknown_frame_count
2028                                             == 0)
2029                                                 entry->status =
2030                                                     ESI_FORWARD_DIRECT;
2031                                         else {
2032                                                 entry->timestamp = jiffies;
2033                                                 entry->status =
2034                                                     ESI_FLUSH_PENDING;
2035 #if 0
2036                                                 send_to_lecd(priv, l_flush_xmt,
2037                                                              NULL,
2038                                                              entry->atm_addr,
2039                                                              NULL);
2040 #endif
2041                                         }
2042                                 } else {
2043                                         /*
2044                                          * They were forming a connection
2045                                          * to us, and we to them. Our
2046                                          * ATM address is numerically lower
2047                                          * than theirs, so we make connection
2048                                          * we formed into default VCC (8.1.11).
2049                                          * Connection they made gets torn
2050                                          * down. This might confuse some
2051                                          * clients. Can be changed if
2052                                          * someone reports trouble...
2053                                          */
2054                                         ;
2055                                 }
2056                         }
2057                 }
2058         }
2059         if (found_entry) {
2060                 pr_debug("After vcc was added\n");
2061                 dump_arp_table(priv);
2062                 goto out;
2063         }
2064         /*
2065          * Not found, snatch address from first data packet that arrives
2066          * from this vcc
2067          */
2068         entry = make_entry(priv, bus_mac);
2069         if (!entry)
2070                 goto out;
2071         entry->vcc = vcc;
2072         entry->old_push = old_push;
2073         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2074         eth_zero_addr(entry->mac_addr);
2075         entry->status = ESI_UNKNOWN;
2076         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2077         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2078         entry->timer.function = lec_arp_expire_vcc;
2079         add_timer(&entry->timer);
2080         pr_debug("After vcc was added\n");
2081         dump_arp_table(priv);
2082 out:
2083         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2084 }
2085
2086 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2087 {
2088         unsigned long flags;
2089         struct lec_arp_table *entry;
2090         int i;
2091
2092         pr_debug("%lx\n", tran_id);
2093 restart:
2094         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2095         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2096                 hlist_for_each_entry(entry,
2097                                      &priv->lec_arp_tables[i], next) {
2098                         if (entry->flush_tran_id == tran_id &&
2099                             entry->status == ESI_FLUSH_PENDING) {
2100                                 struct sk_buff *skb;
2101                                 struct atm_vcc *vcc = entry->vcc;
2102
2103                                 lec_arp_hold(entry);
2104                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2105                                                        flags);
2106                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2107                                         lec_send(vcc, skb);
2108                                 entry->last_used = jiffies;
2109                                 entry->status = ESI_FORWARD_DIRECT;
2110                                 lec_arp_put(entry);
2111                                 pr_debug("LEC_ARP: Flushed\n");
2112                                 goto restart;
2113                         }
2114                 }
2115         }
2116         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2117         dump_arp_table(priv);
2118 }
2119
2120 static void
2121 lec_set_flush_tran_id(struct lec_priv *priv,
2122                       const unsigned char *atm_addr, unsigned long tran_id)
2123 {
2124         unsigned long flags;
2125         struct lec_arp_table *entry;
2126         int i;
2127
2128         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2129         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2130                 hlist_for_each_entry(entry,
2131                                      &priv->lec_arp_tables[i], next) {
2132                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2133                                 entry->flush_tran_id = tran_id;
2134                                 pr_debug("Set flush transaction id to %lx for %p\n",
2135                                          tran_id, entry);
2136                         }
2137                 }
2138         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2139 }
2140
2141 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2142 {
2143         unsigned long flags;
2144         unsigned char mac_addr[] = {
2145                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2146         };
2147         struct lec_arp_table *to_add;
2148         struct lec_vcc_priv *vpriv;
2149         int err = 0;
2150
2151         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2152         if (!vpriv)
2153                 return -ENOMEM;
2154         vpriv->xoff = 0;
2155         vpriv->old_pop = vcc->pop;
2156         vcc->user_back = vpriv;
2157         vcc->pop = lec_pop;
2158         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2159         to_add = make_entry(priv, mac_addr);
2160         if (!to_add) {
2161                 vcc->pop = vpriv->old_pop;
2162                 kfree(vpriv);
2163                 err = -ENOMEM;
2164                 goto out;
2165         }
2166         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2167         to_add->status = ESI_FORWARD_DIRECT;
2168         to_add->flags |= LEC_PERMANENT_FLAG;
2169         to_add->vcc = vcc;
2170         to_add->old_push = vcc->push;
2171         vcc->push = lec_push;
2172         priv->mcast_vcc = vcc;
2173         lec_arp_add(priv, to_add);
2174 out:
2175         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2176         return err;
2177 }
2178
2179 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2180 {
2181         unsigned long flags;
2182         struct hlist_node *next;
2183         struct lec_arp_table *entry;
2184         int i;
2185
2186         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2187         dump_arp_table(priv);
2188
2189         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2190
2191         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2192                 hlist_for_each_entry_safe(entry, next,
2193                                           &priv->lec_arp_tables[i], next) {
2194                         if (vcc == entry->vcc) {
2195                                 lec_arp_remove(priv, entry);
2196                                 lec_arp_put(entry);
2197                                 if (priv->mcast_vcc == vcc)
2198                                         priv->mcast_vcc = NULL;
2199                         }
2200                 }
2201         }
2202
2203         hlist_for_each_entry_safe(entry, next,
2204                                   &priv->lec_arp_empty_ones, next) {
2205                 if (entry->vcc == vcc) {
2206                         lec_arp_clear_vccs(entry);
2207                         del_timer(&entry->timer);
2208                         hlist_del(&entry->next);
2209                         lec_arp_put(entry);
2210                 }
2211         }
2212
2213         hlist_for_each_entry_safe(entry, next,
2214                                   &priv->lec_no_forward, next) {
2215                 if (entry->recv_vcc == vcc) {
2216                         lec_arp_clear_vccs(entry);
2217                         del_timer(&entry->timer);
2218                         hlist_del(&entry->next);
2219                         lec_arp_put(entry);
2220                 }
2221         }
2222
2223         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2224                 if (entry->recv_vcc == vcc) {
2225                         lec_arp_clear_vccs(entry);
2226                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2227                         hlist_del(&entry->next);
2228                         lec_arp_put(entry);
2229                 }
2230         }
2231
2232         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2233         dump_arp_table(priv);
2234 }
2235
2236 static void
2237 lec_arp_check_empties(struct lec_priv *priv,
2238                       struct atm_vcc *vcc, struct sk_buff *skb)
2239 {
2240         unsigned long flags;
2241         struct hlist_node *next;
2242         struct lec_arp_table *entry, *tmp;
2243         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2244         unsigned char *src = hdr->h_source;
2245
2246         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2247         hlist_for_each_entry_safe(entry, next,
2248                                   &priv->lec_arp_empty_ones, next) {
2249                 if (vcc == entry->vcc) {
2250                         del_timer(&entry->timer);
2251                         ether_addr_copy(entry->mac_addr, src);
2252                         entry->status = ESI_FORWARD_DIRECT;
2253                         entry->last_used = jiffies;
2254                         /* We might have got an entry */
2255                         tmp = lec_arp_find(priv, src);
2256                         if (tmp) {
2257                                 lec_arp_remove(priv, tmp);
2258                                 lec_arp_put(tmp);
2259                         }
2260                         hlist_del(&entry->next);
2261                         lec_arp_add(priv, entry);
2262                         goto out;
2263                 }
2264         }
2265         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2266 out:
2267         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2268 }
2269
2270 MODULE_LICENSE("GPL");