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         atomic_inc(&entry->usage);
 108 }
 109
 110 static inline void lec_arp_put(struct lec_arp_table *entry)
 111 {
 112         if (atomic_dec_and_test(&entry->usage))
 113                 kfree(entry);
 114 }
 115
 116 static struct lane2_ops lane2_ops = {
 117         lane2_resolve,          /* resolve,             spec 3.1.3 */
 118         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 119         NULL                    /* associate indicator, 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         atomic_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         atomic_sub(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 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 /* shamelessly stolen from drivers/net/net_init.c */
 551 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 552 {
 553         if ((new_mtu < 68) || (new_mtu > 18190))
 554                 return -EINVAL;
 555         dev->mtu = new_mtu;
 556         return 0;
 557 }
 558
 559 static void lec_set_multicast_list(struct net_device *dev)
 560 {
 561         /*
 562          * by default, all multicast frames arrive over the bus.
 563          * eventually support selective multicast service
 564          */
 565 }
 566
 567 static const struct net_device_ops lec_netdev_ops = {
 568         .ndo_open               = lec_open,
 569         .ndo_stop               = lec_close,
 570         .ndo_start_xmit         = lec_start_xmit,
 571         .ndo_change_mtu         = lec_change_mtu,
 572         .ndo_tx_timeout         = lec_tx_timeout,
 573         .ndo_set_rx_mode        = lec_set_multicast_list,
 574 };
 575
 576 static const unsigned char lec_ctrl_magic[] = {
 577         0xff,
 578         0x00,
 579         0x01,
 580         0x01
 581 };
 582
 583 #define LEC_DATA_DIRECT_8023  2
 584 #define LEC_DATA_DIRECT_8025  3
 585
 586 static int lec_is_data_direct(struct atm_vcc *vcc)
 587 {
 588         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 589                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 590 }
 591
 592 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 593 {
 594         unsigned long flags;
 595         struct net_device *dev = (struct net_device *)vcc->proto_data;
 596         struct lec_priv *priv = netdev_priv(dev);
 597
 598 #if DUMP_PACKETS > 0
 599         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 600                dev->name, vcc->vpi, vcc->vci);
 601 #endif
 602         if (!skb) {
 603                 pr_debug("%s: null skb\n", dev->name);
 604                 lec_vcc_close(priv, vcc);
 605                 return;
 606         }
 607 #if DUMP_PACKETS >= 2
 608 #define MAX_SKB_DUMP 99
 609 #elif DUMP_PACKETS >= 1
 610 #define MAX_SKB_DUMP 30
 611 #endif
 612 #if DUMP_PACKETS > 0
 613         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 614                dev->name, skb->len, priv->lecid);
 615         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 616                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 617 #endif /* DUMP_PACKETS > 0 */
 618         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 619                                 /* Control frame, to daemon */
 620                 struct sock *sk = sk_atm(vcc);
 621
 622                 pr_debug("%s: To daemon\n", dev->name);
 623                 skb_queue_tail(&sk->sk_receive_queue, skb);
 624                 sk->sk_data_ready(sk);
 625         } else {                /* Data frame, queue to protocol handlers */
 626                 struct lec_arp_table *entry;
 627                 unsigned char *src, *dst;
 628
 629                 atm_return(vcc, skb->truesize);
 630                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 631                     !priv->lecd || !(dev->flags & IFF_UP)) {
 632                         /*
 633                          * Probably looping back, or if lecd is missing,
 634                          * lecd has gone down
 635                          */
 636                         pr_debug("Ignoring frame...\n");
 637                         dev_kfree_skb(skb);
 638                         return;
 639                 }
 640                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 641
 642                 /*
 643                  * If this is a Data Direct VCC, and the VCC does not match
 644                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 645                  */
 646                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 647                 if (lec_is_data_direct(vcc)) {
 648                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 649                         entry = lec_arp_find(priv, src);
 650                         if (entry && entry->vcc != vcc) {
 651                                 lec_arp_remove(priv, entry);
 652                                 lec_arp_put(entry);
 653                         }
 654                 }
 655                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 656
 657                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 658                     !priv->is_proxy &&  /* Proxy wants all the packets */
 659                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 660                         dev_kfree_skb(skb);
 661                         return;
 662                 }
 663                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 664                         lec_arp_check_empties(priv, vcc, skb);
 665                 skb_pull(skb, 2);       /* skip lec_id */
 666                 skb->protocol = eth_type_trans(skb, dev);
 667                 dev->stats.rx_packets++;
 668                 dev->stats.rx_bytes += skb->len;
 669                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 670                 netif_rx(skb);
 671         }
 672 }
 673
 674 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 675 {
 676         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 677         struct net_device *dev = skb->dev;
 678
 679         if (vpriv == NULL) {
 680                 pr_info("vpriv = NULL!?!?!?\n");
 681                 return;
 682         }
 683
 684         vpriv->old_pop(vcc, skb);
 685
 686         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 687                 vpriv->xoff = 0;
 688                 if (netif_running(dev) && netif_queue_stopped(dev))
 689                         netif_wake_queue(dev);
 690         }
 691 }
 692
 693 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 694 {
 695         struct lec_vcc_priv *vpriv;
 696         int bytes_left;
 697         struct atmlec_ioc ioc_data;
 698
 699         /* Lecd must be up in this case */
 700         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 701         if (bytes_left != 0)
 702                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 703         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 704                 return -EINVAL;
 705         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 706         if (!dev_lec[ioc_data.dev_num])
 707                 return -EINVAL;
 708         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 709         if (!vpriv)
 710                 return -ENOMEM;
 711         vpriv->xoff = 0;
 712         vpriv->old_pop = vcc->pop;
 713         vcc->user_back = vpriv;
 714         vcc->pop = lec_pop;
 715         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 716                       &ioc_data, vcc, vcc->push);
 717         vcc->proto_data = dev_lec[ioc_data.dev_num];
 718         vcc->push = lec_push;
 719         return 0;
 720 }
 721
 722 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 723 {
 724         if (arg < 0 || arg >= MAX_LEC_ITF)
 725                 return -EINVAL;
 726         arg = array_index_nospec(arg, MAX_LEC_ITF);
 727         if (!dev_lec[arg])
 728                 return -EINVAL;
 729         vcc->proto_data = dev_lec[arg];
 730         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 731 }
 732
 733 /* Initialize device. */
 734 static int lecd_attach(struct atm_vcc *vcc, int arg)
 735 {
 736         int i;
 737         struct lec_priv *priv;
 738
 739         if (arg < 0)
 740                 i = 0;
 741         else
 742                 i = arg;
 743         if (arg >= MAX_LEC_ITF)
 744                 return -EINVAL;
 745         i = array_index_nospec(arg, MAX_LEC_ITF);
 746         if (!dev_lec[i]) {
 747                 int size;
 748
 749                 size = sizeof(struct lec_priv);
 750                 dev_lec[i] = alloc_etherdev(size);
 751                 if (!dev_lec[i])
 752                         return -ENOMEM;
 753                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 754                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 755                 if (register_netdev(dev_lec[i])) {
 756                         free_netdev(dev_lec[i]);
 757                         return -EINVAL;
 758                 }
 759
 760                 priv = netdev_priv(dev_lec[i]);
 761         } else {
 762                 priv = netdev_priv(dev_lec[i]);
 763                 if (priv->lecd)
 764                         return -EADDRINUSE;
 765         }
 766         lec_arp_init(priv);
 767         priv->itfnum = i;       /* LANE2 addition */
 768         priv->lecd = vcc;
 769         vcc->dev = &lecatm_dev;
 770         vcc_insert_socket(sk_atm(vcc));
 771
 772         vcc->proto_data = dev_lec[i];
 773         set_bit(ATM_VF_META, &vcc->flags);
 774         set_bit(ATM_VF_READY, &vcc->flags);
 775
 776         /* Set default values to these variables */
 777         priv->maximum_unknown_frame_count = 1;
 778         priv->max_unknown_frame_time = (1 * HZ);
 779         priv->vcc_timeout_period = (1200 * HZ);
 780         priv->max_retry_count = 1;
 781         priv->aging_time = (300 * HZ);
 782         priv->forward_delay_time = (15 * HZ);
 783         priv->topology_change = 0;
 784         priv->arp_response_time = (1 * HZ);
 785         priv->flush_timeout = (4 * HZ);
 786         priv->path_switching_delay = (6 * HZ);
 787
 788         if (dev_lec[i]->flags & IFF_UP)
 789                 netif_start_queue(dev_lec[i]);
 790         __module_get(THIS_MODULE);
 791         return i;
 792 }
 793
 794 #ifdef CONFIG_PROC_FS
 795 static const char *lec_arp_get_status_string(unsigned char status)
 796 {
 797         static const char *const lec_arp_status_string[] = {
 798                 "ESI_UNKNOWN       ",
 799                 "ESI_ARP_PENDING   ",
 800                 "ESI_VC_PENDING    ",
 801                 "<Undefined>       ",
 802                 "ESI_FLUSH_PENDING ",
 803                 "ESI_FORWARD_DIRECT"
 804         };
 805
 806         if (status > ESI_FORWARD_DIRECT)
 807                 status = 3;     /* ESI_UNDEFINED */
 808         return lec_arp_status_string[status];
 809 }
 810
 811 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 812 {
 813         int i;
 814
 815         for (i = 0; i < ETH_ALEN; i++)
 816                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 817         seq_printf(seq, " ");
 818         for (i = 0; i < ATM_ESA_LEN; i++)
 819                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 820         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 821                    entry->flags & 0xffff);
 822         if (entry->vcc)
 823                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 824         else
 825                 seq_printf(seq, "        ");
 826         if (entry->recv_vcc) {
 827                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 828                            entry->recv_vcc->vci);
 829         }
 830         seq_putc(seq, '\n');
 831 }
 832
 833 struct lec_state {
 834         unsigned long flags;
 835         struct lec_priv *locked;
 836         struct hlist_node *node;
 837         struct net_device *dev;
 838         int itf;
 839         int arp_table;
 840         int misc_table;
 841 };
 842
 843 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 844                           loff_t *l)
 845 {
 846         struct hlist_node *e = state->node;
 847
 848         if (!e)
 849                 e = tbl->first;
 850         if (e == SEQ_START_TOKEN) {
 851                 e = tbl->first;
 852                 --*l;
 853         }
 854
 855         for (; e; e = e->next) {
 856                 if (--*l < 0)
 857                         break;
 858         }
 859         state->node = e;
 860
 861         return (*l < 0) ? state : NULL;
 862 }
 863
 864 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 865                           struct lec_priv *priv)
 866 {
 867         void *v = NULL;
 868         int p;
 869
 870         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 871                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 872                 if (v)
 873                         break;
 874         }
 875         state->arp_table = p;
 876         return v;
 877 }
 878
 879 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 880                            struct lec_priv *priv)
 881 {
 882         struct hlist_head *lec_misc_tables[] = {
 883                 &priv->lec_arp_empty_ones,
 884                 &priv->lec_no_forward,
 885                 &priv->mcast_fwds
 886         };
 887         void *v = NULL;
 888         int q;
 889
 890         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 891                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 892                 if (v)
 893                         break;
 894         }
 895         state->misc_table = q;
 896         return v;
 897 }
 898
 899 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 900                            struct lec_priv *priv)
 901 {
 902         if (!state->locked) {
 903                 state->locked = priv;
 904                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 905         }
 906         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 907                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 908                 state->locked = NULL;
 909                 /* Partial state reset for the next time we get called */
 910                 state->arp_table = state->misc_table = 0;
 911         }
 912         return state->locked;
 913 }
 914
 915 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 916 {
 917         struct net_device *dev;
 918         void *v;
 919
 920         dev = state->dev ? state->dev : dev_lec[state->itf];
 921         v = (dev && netdev_priv(dev)) ?
 922                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 923         if (!v && dev) {
 924                 dev_put(dev);
 925                 /* Partial state reset for the next time we get called */
 926                 dev = NULL;
 927         }
 928         state->dev = dev;
 929         return v;
 930 }
 931
 932 static void *lec_get_idx(struct lec_state *state, loff_t l)
 933 {
 934         void *v = NULL;
 935
 936         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 937                 v = lec_itf_walk(state, &l);
 938                 if (v)
 939                         break;
 940         }
 941         return v;
 942 }
 943
 944 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 945 {
 946         struct lec_state *state = seq->private;
 947
 948         state->itf = 0;
 949         state->dev = NULL;
 950         state->locked = NULL;
 951         state->arp_table = 0;
 952         state->misc_table = 0;
 953         state->node = SEQ_START_TOKEN;
 954
 955         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 956 }
 957
 958 static void lec_seq_stop(struct seq_file *seq, void *v)
 959 {
 960         struct lec_state *state = seq->private;
 961
 962         if (state->dev) {
 963                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 964                                        state->flags);
 965                 dev_put(state->dev);
 966         }
 967 }
 968
 969 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 970 {
 971         struct lec_state *state = seq->private;
 972
 973         v = lec_get_idx(state, 1);
 974         *pos += !!PTR_ERR(v);
 975         return v;
 976 }
 977
 978 static int lec_seq_show(struct seq_file *seq, void *v)
 979 {
 980         static const char lec_banner[] =
 981             "Itf  MAC          ATM destination"
 982             "                          Status            Flags "
 983             "VPI/VCI Recv VPI/VCI\n";
 984
 985         if (v == SEQ_START_TOKEN)
 986                 seq_puts(seq, lec_banner);
 987         else {
 988                 struct lec_state *state = seq->private;
 989                 struct net_device *dev = state->dev;
 990                 struct lec_arp_table *entry = hlist_entry(state->node,
 991                                                           struct lec_arp_table,
 992                                                           next);
 993
 994                 seq_printf(seq, "%s ", dev->name);
 995                 lec_info(seq, entry);
 996         }
 997         return 0;
 998 }
 999
1000 static const struct seq_operations lec_seq_ops = {
1001         .start = lec_seq_start,
1002         .next = lec_seq_next,
1003         .stop = lec_seq_stop,
1004         .show = lec_seq_show,
1005 };
1006
1007 static int lec_seq_open(struct inode *inode, struct file *file)
1008 {
1009         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1010 }
1011
1012 static const struct file_operations lec_seq_fops = {
1013         .owner = THIS_MODULE,
1014         .open = lec_seq_open,
1015         .read = seq_read,
1016         .llseek = seq_lseek,
1017         .release = seq_release_private,
1018 };
1019 #endif
1020
1021 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1022 {
1023         struct atm_vcc *vcc = ATM_SD(sock);
1024         int err = 0;
1025
1026         switch (cmd) {
1027         case ATMLEC_CTRL:
1028         case ATMLEC_MCAST:
1029         case ATMLEC_DATA:
1030                 if (!capable(CAP_NET_ADMIN))
1031                         return -EPERM;
1032                 break;
1033         default:
1034                 return -ENOIOCTLCMD;
1035         }
1036
1037         switch (cmd) {
1038         case ATMLEC_CTRL:
1039                 err = lecd_attach(vcc, (int)arg);
1040                 if (err >= 0)
1041                         sock->state = SS_CONNECTED;
1042                 break;
1043         case ATMLEC_MCAST:
1044                 err = lec_mcast_attach(vcc, (int)arg);
1045                 break;
1046         case ATMLEC_DATA:
1047                 err = lec_vcc_attach(vcc, (void __user *)arg);
1048                 break;
1049         }
1050
1051         return err;
1052 }
1053
1054 static struct atm_ioctl lane_ioctl_ops = {
1055         .owner = THIS_MODULE,
1056         .ioctl = lane_ioctl,
1057 };
1058
1059 static int __init lane_module_init(void)
1060 {
1061 #ifdef CONFIG_PROC_FS
1062         struct proc_dir_entry *p;
1063
1064         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1065         if (!p) {
1066                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1067                 return -ENOMEM;
1068         }
1069 #endif
1070
1071         register_atm_ioctl(&lane_ioctl_ops);
1072         pr_info("lec.c: initialized\n");
1073         return 0;
1074 }
1075
1076 static void __exit lane_module_cleanup(void)
1077 {
1078         int i;
1079
1080         remove_proc_entry("lec", atm_proc_root);
1081
1082         deregister_atm_ioctl(&lane_ioctl_ops);
1083
1084         for (i = 0; i < MAX_LEC_ITF; i++) {
1085                 if (dev_lec[i] != NULL) {
1086                         unregister_netdev(dev_lec[i]);
1087                         free_netdev(dev_lec[i]);
1088                         dev_lec[i] = NULL;
1089                 }
1090         }
1091 }
1092
1093 module_init(lane_module_init);
1094 module_exit(lane_module_cleanup);
1095
1096 /*
1097  * LANE2: 3.1.3, LE_RESOLVE.request
1098  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1099  * If sizeoftlvs == NULL the default TLVs associated with with this
1100  * lec will be used.
1101  * If dst_mac == NULL, targetless LE_ARP will be sent
1102  */
1103 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1104                          u8 **tlvs, u32 *sizeoftlvs)
1105 {
1106         unsigned long flags;
1107         struct lec_priv *priv = netdev_priv(dev);
1108         struct lec_arp_table *table;
1109         struct sk_buff *skb;
1110         int retval;
1111
1112         if (force == 0) {
1113                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1114                 table = lec_arp_find(priv, dst_mac);
1115                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1116                 if (table == NULL)
1117                         return -1;
1118
1119                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1120                 if (*tlvs == NULL)
1121                         return -1;
1122
1123                 *sizeoftlvs = table->sizeoftlvs;
1124
1125                 return 0;
1126         }
1127
1128         if (sizeoftlvs == NULL)
1129                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1130
1131         else {
1132                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1133                 if (skb == NULL)
1134                         return -1;
1135                 skb->len = *sizeoftlvs;
1136                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1137                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1138         }
1139         return retval;
1140 }
1141
1142 /*
1143  * LANE2: 3.1.4, LE_ASSOCIATE.request
1144  * Associate the *tlvs with the *lan_dst address.
1145  * Will overwrite any previous association
1146  * Returns 1 for success, 0 for failure (out of memory)
1147  *
1148  */
1149 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1150                                const u8 *tlvs, u32 sizeoftlvs)
1151 {
1152         int retval;
1153         struct sk_buff *skb;
1154         struct lec_priv *priv = netdev_priv(dev);
1155
1156         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1157                 return 0;       /* not our mac address */
1158
1159         kfree(priv->tlvs);      /* NULL if there was no previous association */
1160
1161         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1162         if (priv->tlvs == NULL)
1163                 return 0;
1164         priv->sizeoftlvs = sizeoftlvs;
1165
1166         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1167         if (skb == NULL)
1168                 return 0;
1169         skb->len = sizeoftlvs;
1170         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1171         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1172         if (retval != 0)
1173                 pr_info("lec.c: lane2_associate_req() failed\n");
1174         /*
1175          * If the previous association has changed we must
1176          * somehow notify other LANE entities about the change
1177          */
1178         return 1;
1179 }
1180
1181 /*
1182  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1183  *
1184  */
1185 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1186                                 const u8 *tlvs, u32 sizeoftlvs)
1187 {
1188 #if 0
1189         int i = 0;
1190 #endif
1191         struct lec_priv *priv = netdev_priv(dev);
1192 #if 0                           /*
1193                                  * Why have the TLVs in LE_ARP entries
1194                                  * since we do not use them? When you
1195                                  * uncomment this code, make sure the
1196                                  * TLVs get freed when entry is killed
1197                                  */
1198         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1199
1200         if (entry == NULL)
1201                 return;         /* should not happen */
1202
1203         kfree(entry->tlvs);
1204
1205         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1206         if (entry->tlvs == NULL)
1207                 return;
1208         entry->sizeoftlvs = sizeoftlvs;
1209 #endif
1210 #if 0
1211         pr_info("\n");
1212         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1213         while (i < sizeoftlvs)
1214                 pr_cont("%02x ", tlvs[i++]);
1215
1216         pr_cont("\n");
1217 #endif
1218
1219         /* tell MPOA about the TLVs we saw */
1220         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1221                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1222                                                      tlvs, sizeoftlvs);
1223         }
1224 }
1225
1226 /*
1227  * Here starts what used to lec_arpc.c
1228  *
1229  * lec_arpc.c was added here when making
1230  * lane client modular. October 1997
1231  */
1232
1233 #include <linux/types.h>
1234 #include <linux/timer.h>
1235 #include <linux/param.h>
1236 #include <linux/atomic.h>
1237 #include <linux/inetdevice.h>
1238 #include <net/route.h>
1239
1240 #if 0
1241 #define pr_debug(format, args...)
1242 /*
1243   #define pr_debug printk
1244 */
1245 #endif
1246 #define DEBUG_ARP_TABLE 0
1247
1248 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1249
1250 static void lec_arp_check_expire(struct work_struct *work);
1251 static void lec_arp_expire_arp(unsigned long data);
1252
1253 /*
1254  * Arp table funcs
1255  */
1256
1257 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1258
1259 /*
1260  * Initialization of arp-cache
1261  */
1262 static void lec_arp_init(struct lec_priv *priv)
1263 {
1264         unsigned short i;
1265
1266         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1267                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1268         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1269         INIT_HLIST_HEAD(&priv->lec_no_forward);
1270         INIT_HLIST_HEAD(&priv->mcast_fwds);
1271         spin_lock_init(&priv->lec_arp_lock);
1272         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1273         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1274 }
1275
1276 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1277 {
1278         if (entry->vcc) {
1279                 struct atm_vcc *vcc = entry->vcc;
1280                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1281                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1282
1283                 vcc->pop = vpriv->old_pop;
1284                 if (vpriv->xoff)
1285                         netif_wake_queue(dev);
1286                 kfree(vpriv);
1287                 vcc->user_back = NULL;
1288                 vcc->push = entry->old_push;
1289                 vcc_release_async(vcc, -EPIPE);
1290                 entry->vcc = NULL;
1291         }
1292         if (entry->recv_vcc) {
1293                 struct atm_vcc *vcc = entry->recv_vcc;
1294                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1295
1296                 kfree(vpriv);
1297                 vcc->user_back = NULL;
1298
1299                 entry->recv_vcc->push = entry->old_recv_push;
1300                 vcc_release_async(entry->recv_vcc, -EPIPE);
1301                 entry->recv_vcc = NULL;
1302         }
1303 }
1304
1305 /*
1306  * Insert entry to lec_arp_table
1307  * LANE2: Add to the end of the list to satisfy 8.1.13
1308  */
1309 static inline void
1310 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1311 {
1312         struct hlist_head *tmp;
1313
1314         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1315         hlist_add_head(&entry->next, tmp);
1316
1317         pr_debug("Added entry:%pM\n", entry->mac_addr);
1318 }
1319
1320 /*
1321  * Remove entry from lec_arp_table
1322  */
1323 static int
1324 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1325 {
1326         struct lec_arp_table *entry;
1327         int i, remove_vcc = 1;
1328
1329         if (!to_remove)
1330                 return -1;
1331
1332         hlist_del(&to_remove->next);
1333         del_timer(&to_remove->timer);
1334
1335         /*
1336          * If this is the only MAC connected to this VCC,
1337          * also tear down the VCC
1338          */
1339         if (to_remove->status >= ESI_FLUSH_PENDING) {
1340                 /*
1341                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1342                  */
1343                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1344                         hlist_for_each_entry(entry,
1345                                              &priv->lec_arp_tables[i], next) {
1346                                 if (memcmp(to_remove->atm_addr,
1347                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1348                                         remove_vcc = 0;
1349                                         break;
1350                                 }
1351                         }
1352                 }
1353                 if (remove_vcc)
1354                         lec_arp_clear_vccs(to_remove);
1355         }
1356         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1357
1358         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1359         return 0;
1360 }
1361
1362 #if DEBUG_ARP_TABLE
1363 static const char *get_status_string(unsigned char st)
1364 {
1365         switch (st) {
1366         case ESI_UNKNOWN:
1367                 return "ESI_UNKNOWN";
1368         case ESI_ARP_PENDING:
1369                 return "ESI_ARP_PENDING";
1370         case ESI_VC_PENDING:
1371                 return "ESI_VC_PENDING";
1372         case ESI_FLUSH_PENDING:
1373                 return "ESI_FLUSH_PENDING";
1374         case ESI_FORWARD_DIRECT:
1375                 return "ESI_FORWARD_DIRECT";
1376         }
1377         return "<UNKNOWN>";
1378 }
1379
1380 static void dump_arp_table(struct lec_priv *priv)
1381 {
1382         struct lec_arp_table *rulla;
1383         char buf[256];
1384         int i, j, offset;
1385
1386         pr_info("Dump %p:\n", priv);
1387         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1388                 hlist_for_each_entry(rulla,
1389                                      &priv->lec_arp_tables[i], next) {
1390                         offset = 0;
1391                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1392                         offset += sprintf(buf + offset, "Mac: %pM",
1393                                           rulla->mac_addr);
1394                         offset += sprintf(buf + offset, " Atm:");
1395                         for (j = 0; j < ATM_ESA_LEN; j++) {
1396                                 offset += sprintf(buf + offset,
1397                                                   "%2.2x ",
1398                                                   rulla->atm_addr[j] & 0xff);
1399                         }
1400                         offset += sprintf(buf + offset,
1401                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1402                                           rulla->vcc ? rulla->vcc->vpi : 0,
1403                                           rulla->vcc ? rulla->vcc->vci : 0,
1404                                           rulla->recv_vcc ? rulla->recv_vcc->
1405                                           vpi : 0,
1406                                           rulla->recv_vcc ? rulla->recv_vcc->
1407                                           vci : 0, rulla->last_used,
1408                                           rulla->timestamp, rulla->no_tries);
1409                         offset +=
1410                             sprintf(buf + offset,
1411                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1412                                     rulla->flags, rulla->packets_flooded,
1413                                     get_status_string(rulla->status));
1414                         pr_info("%s\n", buf);
1415                 }
1416         }
1417
1418         if (!hlist_empty(&priv->lec_no_forward))
1419                 pr_info("No forward\n");
1420         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1421                 offset = 0;
1422                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1423                 offset += sprintf(buf + offset, " Atm:");
1424                 for (j = 0; j < ATM_ESA_LEN; j++) {
1425                         offset += sprintf(buf + offset, "%2.2x ",
1426                                           rulla->atm_addr[j] & 0xff);
1427                 }
1428                 offset += sprintf(buf + offset,
1429                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1430                                   rulla->vcc ? rulla->vcc->vpi : 0,
1431                                   rulla->vcc ? rulla->vcc->vci : 0,
1432                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1433                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1434                                   rulla->last_used,
1435                                   rulla->timestamp, rulla->no_tries);
1436                 offset += sprintf(buf + offset,
1437                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1438                                   rulla->flags, rulla->packets_flooded,
1439                                   get_status_string(rulla->status));
1440                 pr_info("%s\n", buf);
1441         }
1442
1443         if (!hlist_empty(&priv->lec_arp_empty_ones))
1444                 pr_info("Empty ones\n");
1445         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1446                 offset = 0;
1447                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1448                 offset += sprintf(buf + offset, " Atm:");
1449                 for (j = 0; j < ATM_ESA_LEN; j++) {
1450                         offset += sprintf(buf + offset, "%2.2x ",
1451                                           rulla->atm_addr[j] & 0xff);
1452                 }
1453                 offset += sprintf(buf + offset,
1454                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1455                                   rulla->vcc ? rulla->vcc->vpi : 0,
1456                                   rulla->vcc ? rulla->vcc->vci : 0,
1457                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1458                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1459                                   rulla->last_used,
1460                                   rulla->timestamp, rulla->no_tries);
1461                 offset += sprintf(buf + offset,
1462                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1463                                   rulla->flags, rulla->packets_flooded,
1464                                   get_status_string(rulla->status));
1465                 pr_info("%s", buf);
1466         }
1467
1468         if (!hlist_empty(&priv->mcast_fwds))
1469                 pr_info("Multicast Forward VCCs\n");
1470         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1471                 offset = 0;
1472                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1473                 offset += sprintf(buf + offset, " Atm:");
1474                 for (j = 0; j < ATM_ESA_LEN; j++) {
1475                         offset += sprintf(buf + offset, "%2.2x ",
1476                                           rulla->atm_addr[j] & 0xff);
1477                 }
1478                 offset += sprintf(buf + offset,
1479                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1480                                   rulla->vcc ? rulla->vcc->vpi : 0,
1481                                   rulla->vcc ? rulla->vcc->vci : 0,
1482                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1483                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1484                                   rulla->last_used,
1485                                   rulla->timestamp, rulla->no_tries);
1486                 offset += sprintf(buf + offset,
1487                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1488                                   rulla->flags, rulla->packets_flooded,
1489                                   get_status_string(rulla->status));
1490                 pr_info("%s\n", buf);
1491         }
1492
1493 }
1494 #else
1495 #define dump_arp_table(priv) do { } while (0)
1496 #endif
1497
1498 /*
1499  * Destruction of arp-cache
1500  */
1501 static void lec_arp_destroy(struct lec_priv *priv)
1502 {
1503         unsigned long flags;
1504         struct hlist_node *next;
1505         struct lec_arp_table *entry;
1506         int i;
1507
1508         cancel_delayed_work_sync(&priv->lec_arp_work);
1509
1510         /*
1511          * Remove all entries
1512          */
1513
1514         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1515         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1516                 hlist_for_each_entry_safe(entry, next,
1517                                           &priv->lec_arp_tables[i], next) {
1518                         lec_arp_remove(priv, entry);
1519                         lec_arp_put(entry);
1520                 }
1521                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1522         }
1523
1524         hlist_for_each_entry_safe(entry, next,
1525                                   &priv->lec_arp_empty_ones, next) {
1526                 del_timer_sync(&entry->timer);
1527                 lec_arp_clear_vccs(entry);
1528                 hlist_del(&entry->next);
1529                 lec_arp_put(entry);
1530         }
1531         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1532
1533         hlist_for_each_entry_safe(entry, next,
1534                                   &priv->lec_no_forward, next) {
1535                 del_timer_sync(&entry->timer);
1536                 lec_arp_clear_vccs(entry);
1537                 hlist_del(&entry->next);
1538                 lec_arp_put(entry);
1539         }
1540         INIT_HLIST_HEAD(&priv->lec_no_forward);
1541
1542         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1543                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1544                 lec_arp_clear_vccs(entry);
1545                 hlist_del(&entry->next);
1546                 lec_arp_put(entry);
1547         }
1548         INIT_HLIST_HEAD(&priv->mcast_fwds);
1549         priv->mcast_vcc = NULL;
1550         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1551 }
1552
1553 /*
1554  * Find entry by mac_address
1555  */
1556 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1557                                           const unsigned char *mac_addr)
1558 {
1559         struct hlist_head *head;
1560         struct lec_arp_table *entry;
1561
1562         pr_debug("%pM\n", mac_addr);
1563
1564         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1565         hlist_for_each_entry(entry, head, next) {
1566                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1567                         return entry;
1568         }
1569         return NULL;
1570 }
1571
1572 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1573                                         const unsigned char *mac_addr)
1574 {
1575         struct lec_arp_table *to_return;
1576
1577         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1578         if (!to_return) {
1579                 pr_info("LEC: Arp entry kmalloc failed\n");
1580                 return NULL;
1581         }
1582         ether_addr_copy(to_return->mac_addr, mac_addr);
1583         INIT_HLIST_NODE(&to_return->next);
1584         setup_timer(&to_return->timer, lec_arp_expire_arp,
1585                         (unsigned long)to_return);
1586         to_return->last_used = jiffies;
1587         to_return->priv = priv;
1588         skb_queue_head_init(&to_return->tx_wait);
1589         atomic_set(&to_return->usage, 1);
1590         return to_return;
1591 }
1592
1593 /* Arp sent timer expired */
1594 static void lec_arp_expire_arp(unsigned long data)
1595 {
1596         struct lec_arp_table *entry;
1597
1598         entry = (struct lec_arp_table *)data;
1599
1600         pr_debug("\n");
1601         if (entry->status == ESI_ARP_PENDING) {
1602                 if (entry->no_tries <= entry->priv->max_retry_count) {
1603                         if (entry->is_rdesc)
1604                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1605                                              entry->mac_addr, NULL, NULL);
1606                         else
1607                                 send_to_lecd(entry->priv, l_arp_xmt,
1608                                              entry->mac_addr, NULL, NULL);
1609                         entry->no_tries++;
1610                 }
1611                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1612         }
1613 }
1614
1615 /* Unknown/unused vcc expire, remove associated entry */
1616 static void lec_arp_expire_vcc(unsigned long data)
1617 {
1618         unsigned long flags;
1619         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1620         struct lec_priv *priv = to_remove->priv;
1621
1622         del_timer(&to_remove->timer);
1623
1624         pr_debug("%p %p: vpi:%d vci:%d\n",
1625                  to_remove, priv,
1626                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1627                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1628
1629         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1630         hlist_del(&to_remove->next);
1631         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1632
1633         lec_arp_clear_vccs(to_remove);
1634         lec_arp_put(to_remove);
1635 }
1636
1637 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1638                                    unsigned long now,
1639                                    struct lec_priv *priv)
1640 {
1641         unsigned long time_to_check;
1642
1643         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1644                 time_to_check = priv->forward_delay_time;
1645         else
1646                 time_to_check = priv->aging_time;
1647
1648         pr_debug("About to expire: %lx - %lx > %lx\n",
1649                  now, entry->last_used, time_to_check);
1650         if (time_after(now, entry->last_used + time_to_check) &&
1651             !(entry->flags & LEC_PERMANENT_FLAG) &&
1652             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1653                 /* Remove entry */
1654                 pr_debug("Entry timed out\n");
1655                 lec_arp_remove(priv, entry);
1656                 lec_arp_put(entry);
1657         } else {
1658                 /* Something else */
1659                 if ((entry->status == ESI_VC_PENDING ||
1660                      entry->status == ESI_ARP_PENDING) &&
1661                     time_after_eq(now, entry->timestamp +
1662                                        priv->max_unknown_frame_time)) {
1663                         entry->timestamp = jiffies;
1664                         entry->packets_flooded = 0;
1665                         if (entry->status == ESI_VC_PENDING)
1666                                 send_to_lecd(priv, l_svc_setup,
1667                                              entry->mac_addr,
1668                                              entry->atm_addr,
1669                                              NULL);
1670                 }
1671                 if (entry->status == ESI_FLUSH_PENDING &&
1672                     time_after_eq(now, entry->timestamp +
1673                                        priv->path_switching_delay)) {
1674                         lec_arp_hold(entry);
1675                         return true;
1676                 }
1677         }
1678
1679         return false;
1680 }
1681 /*
1682  * Expire entries.
1683  * 1. Re-set timer
1684  * 2. For each entry, delete entries that have aged past the age limit.
1685  * 3. For each entry, depending on the status of the entry, perform
1686  *    the following maintenance.
1687  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1688  *       tick_count is above the max_unknown_frame_time, clear
1689  *       the tick_count to zero and clear the packets_flooded counter
1690  *       to zero. This supports the packet rate limit per address
1691  *       while flooding unknowns.
1692  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1693  *       than or equal to the path_switching_delay, change the status
1694  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1695  *       regardless of the progress of the flush protocol.
1696  */
1697 static void lec_arp_check_expire(struct work_struct *work)
1698 {
1699         unsigned long flags;
1700         struct lec_priv *priv =
1701                 container_of(work, struct lec_priv, lec_arp_work.work);
1702         struct hlist_node *next;
1703         struct lec_arp_table *entry;
1704         unsigned long now;
1705         int i;
1706
1707         pr_debug("%p\n", priv);
1708         now = jiffies;
1709 restart:
1710         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1711         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1712                 hlist_for_each_entry_safe(entry, next,
1713                                           &priv->lec_arp_tables[i], next) {
1714                         if (__lec_arp_check_expire(entry, now, priv)) {
1715                                 struct sk_buff *skb;
1716                                 struct atm_vcc *vcc = entry->vcc;
1717
1718                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1719                                                        flags);
1720                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1721                                         lec_send(vcc, skb);
1722                                 entry->last_used = jiffies;
1723                                 entry->status = ESI_FORWARD_DIRECT;
1724                                 lec_arp_put(entry);
1725
1726                                 goto restart;
1727                         }
1728                 }
1729         }
1730         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1731
1732         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1733 }
1734
1735 /*
1736  * Try to find vcc where mac_address is attached.
1737  *
1738  */
1739 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1740                                        const unsigned char *mac_to_find,
1741                                        int is_rdesc,
1742                                        struct lec_arp_table **ret_entry)
1743 {
1744         unsigned long flags;
1745         struct lec_arp_table *entry;
1746         struct atm_vcc *found;
1747
1748         if (mac_to_find[0] & 0x01) {
1749                 switch (priv->lane_version) {
1750                 case 1:
1751                         return priv->mcast_vcc;
1752                 case 2: /* LANE2 wants arp for multicast addresses */
1753                         if (ether_addr_equal(mac_to_find, bus_mac))
1754                                 return priv->mcast_vcc;
1755                         break;
1756                 default:
1757                         break;
1758                 }
1759         }
1760
1761         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1762         entry = lec_arp_find(priv, mac_to_find);
1763
1764         if (entry) {
1765                 if (entry->status == ESI_FORWARD_DIRECT) {
1766                         /* Connection Ok */
1767                         entry->last_used = jiffies;
1768                         lec_arp_hold(entry);
1769                         *ret_entry = entry;
1770                         found = entry->vcc;
1771                         goto out;
1772                 }
1773                 /*
1774                  * If the LE_ARP cache entry is still pending, reset count to 0
1775                  * so another LE_ARP request can be made for this frame.
1776                  */
1777                 if (entry->status == ESI_ARP_PENDING)
1778                         entry->no_tries = 0;
1779                 /*
1780                  * Data direct VC not yet set up, check to see if the unknown
1781                  * frame count is greater than the limit. If the limit has
1782                  * not been reached, allow the caller to send packet to
1783                  * BUS.
1784                  */
1785                 if (entry->status != ESI_FLUSH_PENDING &&
1786                     entry->packets_flooded <
1787                     priv->maximum_unknown_frame_count) {
1788                         entry->packets_flooded++;
1789                         pr_debug("Flooding..\n");
1790                         found = priv->mcast_vcc;
1791                         goto out;
1792                 }
1793                 /*
1794                  * We got here because entry->status == ESI_FLUSH_PENDING
1795                  * or BUS flood limit was reached for an entry which is
1796                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1797                  */
1798                 lec_arp_hold(entry);
1799                 *ret_entry = entry;
1800                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1801                          entry->vcc);
1802                 found = NULL;
1803         } else {
1804                 /* No matching entry was found */
1805                 entry = make_entry(priv, mac_to_find);
1806                 pr_debug("Making entry\n");
1807                 if (!entry) {
1808                         found = priv->mcast_vcc;
1809                         goto out;
1810                 }
1811                 lec_arp_add(priv, entry);
1812                 /* We want arp-request(s) to be sent */
1813                 entry->packets_flooded = 1;
1814                 entry->status = ESI_ARP_PENDING;
1815                 entry->no_tries = 1;
1816                 entry->last_used = entry->timestamp = jiffies;
1817                 entry->is_rdesc = is_rdesc;
1818                 if (entry->is_rdesc)
1819                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1820                                      NULL);
1821                 else
1822                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1823                 entry->timer.expires = jiffies + (1 * HZ);
1824                 entry->timer.function = lec_arp_expire_arp;
1825                 add_timer(&entry->timer);
1826                 found = priv->mcast_vcc;
1827         }
1828
1829 out:
1830         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1831         return found;
1832 }
1833
1834 static int
1835 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1836                 unsigned long permanent)
1837 {
1838         unsigned long flags;
1839         struct hlist_node *next;
1840         struct lec_arp_table *entry;
1841         int i;
1842
1843         pr_debug("\n");
1844         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1845         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1846                 hlist_for_each_entry_safe(entry, next,
1847                                           &priv->lec_arp_tables[i], next) {
1848                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1849                             (permanent ||
1850                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1851                                 lec_arp_remove(priv, entry);
1852                                 lec_arp_put(entry);
1853                         }
1854                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1855                         return 0;
1856                 }
1857         }
1858         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1859         return -1;
1860 }
1861
1862 /*
1863  * Notifies:  Response to arp_request (atm_addr != NULL)
1864  */
1865 static void
1866 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1867                const unsigned char *atm_addr, unsigned long remoteflag,
1868                unsigned int targetless_le_arp)
1869 {
1870         unsigned long flags;
1871         struct hlist_node *next;
1872         struct lec_arp_table *entry, *tmp;
1873         int i;
1874
1875         pr_debug("%smac:%pM\n",
1876                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1877
1878         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1879         entry = lec_arp_find(priv, mac_addr);
1880         if (entry == NULL && targetless_le_arp)
1881                 goto out;       /*
1882                                  * LANE2: ignore targetless LE_ARPs for which
1883                                  * we have no entry in the cache. 7.1.30
1884                                  */
1885         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1886                 hlist_for_each_entry_safe(entry, next,
1887                                           &priv->lec_arp_empty_ones, next) {
1888                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1889                                 hlist_del(&entry->next);
1890                                 del_timer(&entry->timer);
1891                                 tmp = lec_arp_find(priv, mac_addr);
1892                                 if (tmp) {
1893                                         del_timer(&tmp->timer);
1894                                         tmp->status = ESI_FORWARD_DIRECT;
1895                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1896                                         tmp->vcc = entry->vcc;
1897                                         tmp->old_push = entry->old_push;
1898                                         tmp->last_used = jiffies;
1899                                         del_timer(&entry->timer);
1900                                         lec_arp_put(entry);
1901                                         entry = tmp;
1902                                 } else {
1903                                         entry->status = ESI_FORWARD_DIRECT;
1904                                         ether_addr_copy(entry->mac_addr,
1905                                                         mac_addr);
1906                                         entry->last_used = jiffies;
1907                                         lec_arp_add(priv, entry);
1908                                 }
1909                                 if (remoteflag)
1910                                         entry->flags |= LEC_REMOTE_FLAG;
1911                                 else
1912                                         entry->flags &= ~LEC_REMOTE_FLAG;
1913                                 pr_debug("After update\n");
1914                                 dump_arp_table(priv);
1915                                 goto out;
1916                         }
1917                 }
1918         }
1919
1920         entry = lec_arp_find(priv, mac_addr);
1921         if (!entry) {
1922                 entry = make_entry(priv, mac_addr);
1923                 if (!entry)
1924                         goto out;
1925                 entry->status = ESI_UNKNOWN;
1926                 lec_arp_add(priv, entry);
1927                 /* Temporary, changes before end of function */
1928         }
1929         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1930         del_timer(&entry->timer);
1931         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1932                 hlist_for_each_entry(tmp,
1933                                      &priv->lec_arp_tables[i], next) {
1934                         if (entry != tmp &&
1935                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1936                                 /* Vcc to this host exists */
1937                                 if (tmp->status > ESI_VC_PENDING) {
1938                                         /*
1939                                          * ESI_FLUSH_PENDING,
1940                                          * ESI_FORWARD_DIRECT
1941                                          */
1942                                         entry->vcc = tmp->vcc;
1943                                         entry->old_push = tmp->old_push;
1944                                 }
1945                                 entry->status = tmp->status;
1946                                 break;
1947                         }
1948                 }
1949         }
1950         if (remoteflag)
1951                 entry->flags |= LEC_REMOTE_FLAG;
1952         else
1953                 entry->flags &= ~LEC_REMOTE_FLAG;
1954         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1955                 entry->status = ESI_VC_PENDING;
1956                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1957         }
1958         pr_debug("After update2\n");
1959         dump_arp_table(priv);
1960 out:
1961         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1962 }
1963
1964 /*
1965  * Notifies: Vcc setup ready
1966  */
1967 static void
1968 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1969               struct atm_vcc *vcc,
1970               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1971 {
1972         unsigned long flags;
1973         struct lec_arp_table *entry;
1974         int i, found_entry = 0;
1975
1976         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1977         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1978         if (ioc_data->receive == 2) {
1979                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1980 #if 0
1981                 entry = lec_arp_find(priv, bus_mac);
1982                 if (!entry) {
1983                         pr_info("LEC_ARP: Multicast entry not found!\n");
1984                         goto out;
1985                 }
1986                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1987                 entry->recv_vcc = vcc;
1988                 entry->old_recv_push = old_push;
1989 #endif
1990                 entry = make_entry(priv, bus_mac);
1991                 if (entry == NULL)
1992                         goto out;
1993                 del_timer(&entry->timer);
1994                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1995                 entry->recv_vcc = vcc;
1996                 entry->old_recv_push = old_push;
1997                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1998                 goto out;
1999         } else if (ioc_data->receive == 1) {
2000                 /*
2001                  * Vcc which we don't want to make default vcc,
2002                  * attach it anyway.
2003                  */
2004                 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",
2005                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2006                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2007                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2008                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2009                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2010                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2011                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2012                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2013                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2014                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2015                 entry = make_entry(priv, bus_mac);
2016                 if (entry == NULL)
2017                         goto out;
2018                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2019                 eth_zero_addr(entry->mac_addr);
2020                 entry->recv_vcc = vcc;
2021                 entry->old_recv_push = old_push;
2022                 entry->status = ESI_UNKNOWN;
2023                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2024                 entry->timer.function = lec_arp_expire_vcc;
2025                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2026                 add_timer(&entry->timer);
2027                 dump_arp_table(priv);
2028                 goto out;
2029         }
2030         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",
2031                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2032                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2033                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2034                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2035                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2036                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2037                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2038                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2039                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2040                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2041         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2042                 hlist_for_each_entry(entry,
2043                                      &priv->lec_arp_tables[i], next) {
2044                         if (memcmp
2045                             (ioc_data->atm_addr, entry->atm_addr,
2046                              ATM_ESA_LEN) == 0) {
2047                                 pr_debug("LEC_ARP: Attaching data direct\n");
2048                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2049                                          entry->vcc ? entry->vcc->vci : 0,
2050                                          entry->recv_vcc ? entry->recv_vcc->
2051                                          vci : 0);
2052                                 found_entry = 1;
2053                                 del_timer(&entry->timer);
2054                                 entry->vcc = vcc;
2055                                 entry->old_push = old_push;
2056                                 if (entry->status == ESI_VC_PENDING) {
2057                                         if (priv->maximum_unknown_frame_count
2058                                             == 0)
2059                                                 entry->status =
2060                                                     ESI_FORWARD_DIRECT;
2061                                         else {
2062                                                 entry->timestamp = jiffies;
2063                                                 entry->status =
2064                                                     ESI_FLUSH_PENDING;
2065 #if 0
2066                                                 send_to_lecd(priv, l_flush_xmt,
2067                                                              NULL,
2068                                                              entry->atm_addr,
2069                                                              NULL);
2070 #endif
2071                                         }
2072                                 } else {
2073                                         /*
2074                                          * They were forming a connection
2075                                          * to us, and we to them. Our
2076                                          * ATM address is numerically lower
2077                                          * than theirs, so we make connection
2078                                          * we formed into default VCC (8.1.11).
2079                                          * Connection they made gets torn
2080                                          * down. This might confuse some
2081                                          * clients. Can be changed if
2082                                          * someone reports trouble...
2083                                          */
2084                                         ;
2085                                 }
2086                         }
2087                 }
2088         }
2089         if (found_entry) {
2090                 pr_debug("After vcc was added\n");
2091                 dump_arp_table(priv);
2092                 goto out;
2093         }
2094         /*
2095          * Not found, snatch address from first data packet that arrives
2096          * from this vcc
2097          */
2098         entry = make_entry(priv, bus_mac);
2099         if (!entry)
2100                 goto out;
2101         entry->vcc = vcc;
2102         entry->old_push = old_push;
2103         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2104         eth_zero_addr(entry->mac_addr);
2105         entry->status = ESI_UNKNOWN;
2106         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2107         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2108         entry->timer.function = lec_arp_expire_vcc;
2109         add_timer(&entry->timer);
2110         pr_debug("After vcc was added\n");
2111         dump_arp_table(priv);
2112 out:
2113         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2114 }
2115
2116 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2117 {
2118         unsigned long flags;
2119         struct lec_arp_table *entry;
2120         int i;
2121
2122         pr_debug("%lx\n", tran_id);
2123 restart:
2124         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2125         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2126                 hlist_for_each_entry(entry,
2127                                      &priv->lec_arp_tables[i], next) {
2128                         if (entry->flush_tran_id == tran_id &&
2129                             entry->status == ESI_FLUSH_PENDING) {
2130                                 struct sk_buff *skb;
2131                                 struct atm_vcc *vcc = entry->vcc;
2132
2133                                 lec_arp_hold(entry);
2134                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2135                                                        flags);
2136                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2137                                         lec_send(vcc, skb);
2138                                 entry->last_used = jiffies;
2139                                 entry->status = ESI_FORWARD_DIRECT;
2140                                 lec_arp_put(entry);
2141                                 pr_debug("LEC_ARP: Flushed\n");
2142                                 goto restart;
2143                         }
2144                 }
2145         }
2146         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2147         dump_arp_table(priv);
2148 }
2149
2150 static void
2151 lec_set_flush_tran_id(struct lec_priv *priv,
2152                       const unsigned char *atm_addr, unsigned long tran_id)
2153 {
2154         unsigned long flags;
2155         struct lec_arp_table *entry;
2156         int i;
2157
2158         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2159         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2160                 hlist_for_each_entry(entry,
2161                                      &priv->lec_arp_tables[i], next) {
2162                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2163                                 entry->flush_tran_id = tran_id;
2164                                 pr_debug("Set flush transaction id to %lx for %p\n",
2165                                          tran_id, entry);
2166                         }
2167                 }
2168         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2169 }
2170
2171 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2172 {
2173         unsigned long flags;
2174         unsigned char mac_addr[] = {
2175                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2176         };
2177         struct lec_arp_table *to_add;
2178         struct lec_vcc_priv *vpriv;
2179         int err = 0;
2180
2181         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2182         if (!vpriv)
2183                 return -ENOMEM;
2184         vpriv->xoff = 0;
2185         vpriv->old_pop = vcc->pop;
2186         vcc->user_back = vpriv;
2187         vcc->pop = lec_pop;
2188         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2189         to_add = make_entry(priv, mac_addr);
2190         if (!to_add) {
2191                 vcc->pop = vpriv->old_pop;
2192                 kfree(vpriv);
2193                 err = -ENOMEM;
2194                 goto out;
2195         }
2196         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2197         to_add->status = ESI_FORWARD_DIRECT;
2198         to_add->flags |= LEC_PERMANENT_FLAG;
2199         to_add->vcc = vcc;
2200         to_add->old_push = vcc->push;
2201         vcc->push = lec_push;
2202         priv->mcast_vcc = vcc;
2203         lec_arp_add(priv, to_add);
2204 out:
2205         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2206         return err;
2207 }
2208
2209 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2210 {
2211         unsigned long flags;
2212         struct hlist_node *next;
2213         struct lec_arp_table *entry;
2214         int i;
2215
2216         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2217         dump_arp_table(priv);
2218
2219         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2220
2221         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2222                 hlist_for_each_entry_safe(entry, next,
2223                                           &priv->lec_arp_tables[i], next) {
2224                         if (vcc == entry->vcc) {
2225                                 lec_arp_remove(priv, entry);
2226                                 lec_arp_put(entry);
2227                                 if (priv->mcast_vcc == vcc)
2228                                         priv->mcast_vcc = NULL;
2229                         }
2230                 }
2231         }
2232
2233         hlist_for_each_entry_safe(entry, next,
2234                                   &priv->lec_arp_empty_ones, next) {
2235                 if (entry->vcc == vcc) {
2236                         lec_arp_clear_vccs(entry);
2237                         del_timer(&entry->timer);
2238                         hlist_del(&entry->next);
2239                         lec_arp_put(entry);
2240                 }
2241         }
2242
2243         hlist_for_each_entry_safe(entry, next,
2244                                   &priv->lec_no_forward, next) {
2245                 if (entry->recv_vcc == vcc) {
2246                         lec_arp_clear_vccs(entry);
2247                         del_timer(&entry->timer);
2248                         hlist_del(&entry->next);
2249                         lec_arp_put(entry);
2250                 }
2251         }
2252
2253         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2254                 if (entry->recv_vcc == vcc) {
2255                         lec_arp_clear_vccs(entry);
2256                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2257                         hlist_del(&entry->next);
2258                         lec_arp_put(entry);
2259                 }
2260         }
2261
2262         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2263         dump_arp_table(priv);
2264 }
2265
2266 static void
2267 lec_arp_check_empties(struct lec_priv *priv,
2268                       struct atm_vcc *vcc, struct sk_buff *skb)
2269 {
2270         unsigned long flags;
2271         struct hlist_node *next;
2272         struct lec_arp_table *entry, *tmp;
2273         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2274         unsigned char *src = hdr->h_source;
2275
2276         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2277         hlist_for_each_entry_safe(entry, next,
2278                                   &priv->lec_arp_empty_ones, next) {
2279                 if (vcc == entry->vcc) {
2280                         del_timer(&entry->timer);
2281                         ether_addr_copy(entry->mac_addr, src);
2282                         entry->status = ESI_FORWARD_DIRECT;
2283                         entry->last_used = jiffies;
2284                         /* We might have got an entry */
2285                         tmp = lec_arp_find(priv, src);
2286                         if (tmp) {
2287                                 lec_arp_remove(priv, tmp);
2288                                 lec_arp_put(tmp);
2289                         }
2290                         hlist_del(&entry->next);
2291                         lec_arp_add(priv, entry);
2292                         goto out;
2293                 }
2294         }
2295         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2296 out:
2297         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2298 }
2299
2300 MODULE_LICENSE("GPL");