net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9 #include <linux/slab.h>
  10 #include <linux/kernel.h>
  11 #include <linux/bitops.h>
  12 #include <linux/capability.h>
  13
  14 /* We are ethernet device */
  15 #include <linux/if_ether.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <net/sock.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/ip.h>
  21 #include <asm/byteorder.h>
  22 #include <linux/uaccess.h>
  23 #include <net/arp.h>
  24 #include <net/dst.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/seq_file.h>
  28
  29 /* And atm device */
  30 #include <linux/atmdev.h>
  31 #include <linux/atmlec.h>
  32
  33 /* Proxy LEC knows about bridging */
  34 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  35 #include "../bridge/br_private.h"
  36
  37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  38 #endif
  39
  40 /* Modular too */
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43
  44 #include "lec.h"
  45 #include "lec_arpc.h"
  46 #include "resources.h"
  47
  48 #define DUMP_PACKETS 0          /*
  49                                  * 0 = None,
  50                                  * 1 = 30 first bytes
  51                                  * 2 = Whole packet
  52                                  */
  53
  54 #define LEC_UNRES_QUE_LEN 8     /*
  55                                  * number of tx packets to queue for a
  56                                  * single destination while waiting for SVC
  57                                  */
  58
  59 static int lec_open(struct net_device *dev);
  60 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  61                                   struct net_device *dev);
  62 static int lec_close(struct net_device *dev);
  63 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  64                                           const unsigned char *mac_addr);
  65 static int lec_arp_remove(struct lec_priv *priv,
  66                           struct lec_arp_table *to_remove);
  67 /* LANE2 functions */
  68 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  69                                 const u8 *tlvs, u32 sizeoftlvs);
  70 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  71                          u8 **tlvs, u32 *sizeoftlvs);
  72 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  73                                const u8 *tlvs, u32 sizeoftlvs);
  74
  75 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  76                            unsigned long permanent);
  77 static void lec_arp_check_empties(struct lec_priv *priv,
  78                                   struct atm_vcc *vcc, struct sk_buff *skb);
  79 static void lec_arp_destroy(struct lec_priv *priv);
  80 static void lec_arp_init(struct lec_priv *priv);
  81 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  82                                        const unsigned char *mac_to_find,
  83                                        int is_rdesc,
  84                                        struct lec_arp_table **ret_entry);
  85 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  86                            const unsigned char *atm_addr,
  87                            unsigned long remoteflag,
  88                            unsigned int targetless_le_arp);
  89 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  90 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  91 static void lec_set_flush_tran_id(struct lec_priv *priv,
  92                                   const unsigned char *atm_addr,
  93                                   unsigned long tran_id);
  94 static void lec_vcc_added(struct lec_priv *priv,
  95                           const struct atmlec_ioc *ioc_data,
  96                           struct atm_vcc *vcc,
  97                           void (*old_push)(struct atm_vcc *vcc,
  98                                            struct sk_buff *skb));
  99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 100
 101 /* must be done under lec_arp_lock */
 102 static inline void lec_arp_hold(struct lec_arp_table *entry)
 103 {
 104         atomic_inc(&entry->usage);
 105 }
 106
 107 static inline void lec_arp_put(struct lec_arp_table *entry)
 108 {
 109         if (atomic_dec_and_test(&entry->usage))
 110                 kfree(entry);
 111 }
 112
 113 static struct lane2_ops lane2_ops = {
 114         lane2_resolve,          /* resolve,             spec 3.1.3 */
 115         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 116         NULL                    /* associate indicator, spec 3.1.5 */
 117 };
 118
 119 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 120
 121 /* Device structures */
 122 static struct net_device *dev_lec[MAX_LEC_ITF];
 123
 124 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 125 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 126 {
 127         char *buff;
 128         struct lec_priv *priv;
 129
 130         /*
 131          * Check if this is a BPDU. If so, ask zeppelin to send
 132          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 133          * as the Config BPDU has
 134          */
 135         buff = skb->data + skb->dev->hard_header_len;
 136         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 137                 struct sock *sk;
 138                 struct sk_buff *skb2;
 139                 struct atmlec_msg *mesg;
 140
 141                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 142                 if (skb2 == NULL)
 143                         return;
 144                 skb2->len = sizeof(struct atmlec_msg);
 145                 mesg = (struct atmlec_msg *)skb2->data;
 146                 mesg->type = l_topology_change;
 147                 buff += 4;
 148                 mesg->content.normal.flag = *buff & 0x01;
 149                                         /* 0x01 is topology change */
 150
 151                 priv = netdev_priv(dev);
 152                 atm_force_charge(priv->lecd, skb2->truesize);
 153                 sk = sk_atm(priv->lecd);
 154                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 155                 sk->sk_data_ready(sk, skb2->len);
 156         }
 157 }
 158 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 159
 160 /*
 161  * Open/initialize the netdevice. This is called (in the current kernel)
 162  * sometime after booting when the 'ifconfig' program is run.
 163  *
 164  * This routine should set everything up anew at each open, even
 165  * registers that "should" only need to be set once at boot, so that
 166  * there is non-reboot way to recover if something goes wrong.
 167  */
 168
 169 static int lec_open(struct net_device *dev)
 170 {
 171         netif_start_queue(dev);
 172
 173         return 0;
 174 }
 175
 176 static void
 177 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 178 {
 179         struct net_device *dev = skb->dev;
 180
 181         ATM_SKB(skb)->vcc = vcc;
 182         ATM_SKB(skb)->atm_options = vcc->atm_options;
 183
 184         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 185         if (vcc->send(vcc, skb) < 0) {
 186                 dev->stats.tx_dropped++;
 187                 return;
 188         }
 189
 190         dev->stats.tx_packets++;
 191         dev->stats.tx_bytes += skb->len;
 192 }
 193
 194 static void lec_tx_timeout(struct net_device *dev)
 195 {
 196         pr_info("%s\n", dev->name);
 197         dev->trans_start = jiffies;
 198         netif_wake_queue(dev);
 199 }
 200
 201 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 202                                   struct net_device *dev)
 203 {
 204         struct sk_buff *skb2;
 205         struct lec_priv *priv = netdev_priv(dev);
 206         struct lecdatahdr_8023 *lec_h;
 207         struct atm_vcc *vcc;
 208         struct lec_arp_table *entry;
 209         unsigned char *dst;
 210         int min_frame_size;
 211         int is_rdesc;
 212
 213         pr_debug("called\n");
 214         if (!priv->lecd) {
 215                 pr_info("%s:No lecd attached\n", dev->name);
 216                 dev->stats.tx_errors++;
 217                 netif_stop_queue(dev);
 218                 kfree_skb(skb);
 219                 return NETDEV_TX_OK;
 220         }
 221
 222         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 223                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 224                  (long)skb_end_pointer(skb));
 225 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 226         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 227                 lec_handle_bridge(skb, dev);
 228 #endif
 229
 230         /* Make sure we have room for lec_id */
 231         if (skb_headroom(skb) < 2) {
 232                 pr_debug("reallocating skb\n");
 233                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 234                 kfree_skb(skb);
 235                 if (skb2 == NULL)
 236                         return NETDEV_TX_OK;
 237                 skb = skb2;
 238         }
 239         skb_push(skb, 2);
 240
 241         /* Put le header to place */
 242         lec_h = (struct lecdatahdr_8023 *)skb->data;
 243         lec_h->le_header = htons(priv->lecid);
 244
 245 #if DUMP_PACKETS >= 2
 246 #define MAX_DUMP_SKB 99
 247 #elif DUMP_PACKETS >= 1
 248 #define MAX_DUMP_SKB 30
 249 #endif
 250 #if DUMP_PACKETS >= 1
 251         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 252                dev->name, skb->len, priv->lecid);
 253         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 254                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 255 #endif /* DUMP_PACKETS >= 1 */
 256
 257         /* Minimum ethernet-frame size */
 258         min_frame_size = LEC_MINIMUM_8023_SIZE;
 259         if (skb->len < min_frame_size) {
 260                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 261                         skb2 = skb_copy_expand(skb, 0,
 262                                                min_frame_size - skb->truesize,
 263                                                GFP_ATOMIC);
 264                         dev_kfree_skb(skb);
 265                         if (skb2 == NULL) {
 266                                 dev->stats.tx_dropped++;
 267                                 return NETDEV_TX_OK;
 268                         }
 269                         skb = skb2;
 270                 }
 271                 skb_put(skb, min_frame_size - skb->len);
 272         }
 273
 274         /* Send to right vcc */
 275         is_rdesc = 0;
 276         dst = lec_h->h_dest;
 277         entry = NULL;
 278         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 279         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 280                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 281         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 282                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 283                         pr_debug("%s:queuing packet, MAC address %pM\n",
 284                                  dev->name, lec_h->h_dest);
 285                         skb_queue_tail(&entry->tx_wait, skb);
 286                 } else {
 287                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 288                                  dev->name, lec_h->h_dest);
 289                         dev->stats.tx_dropped++;
 290                         dev_kfree_skb(skb);
 291                 }
 292                 goto out;
 293         }
 294 #if DUMP_PACKETS > 0
 295         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 296                dev->name, vcc->vpi, vcc->vci);
 297 #endif /* DUMP_PACKETS > 0 */
 298
 299         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 300                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 301                 lec_send(vcc, skb2);
 302         }
 303
 304         lec_send(vcc, skb);
 305
 306         if (!atm_may_send(vcc, 0)) {
 307                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 308
 309                 vpriv->xoff = 1;
 310                 netif_stop_queue(dev);
 311
 312                 /*
 313                  * vcc->pop() might have occurred in between, making
 314                  * the vcc usuable again.  Since xmit is serialized,
 315                  * this is the only situation we have to re-test.
 316                  */
 317
 318                 if (atm_may_send(vcc, 0))
 319                         netif_wake_queue(dev);
 320         }
 321
 322 out:
 323         if (entry)
 324                 lec_arp_put(entry);
 325         dev->trans_start = jiffies;
 326         return NETDEV_TX_OK;
 327 }
 328
 329 /* The inverse routine to net_open(). */
 330 static int lec_close(struct net_device *dev)
 331 {
 332         netif_stop_queue(dev);
 333         return 0;
 334 }
 335
 336 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 337 {
 338         unsigned long flags;
 339         struct net_device *dev = (struct net_device *)vcc->proto_data;
 340         struct lec_priv *priv = netdev_priv(dev);
 341         struct atmlec_msg *mesg;
 342         struct lec_arp_table *entry;
 343         int i;
 344         char *tmp;              /* FIXME */
 345
 346         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 347         mesg = (struct atmlec_msg *)skb->data;
 348         tmp = skb->data;
 349         tmp += sizeof(struct atmlec_msg);
 350         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 351         switch (mesg->type) {
 352         case l_set_mac_addr:
 353                 for (i = 0; i < 6; i++)
 354                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 355                 break;
 356         case l_del_mac_addr:
 357                 for (i = 0; i < 6; i++)
 358                         dev->dev_addr[i] = 0;
 359                 break;
 360         case l_addr_delete:
 361                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 362                                 mesg->content.normal.flag);
 363                 break;
 364         case l_topology_change:
 365                 priv->topology_change = mesg->content.normal.flag;
 366                 break;
 367         case l_flush_complete:
 368                 lec_flush_complete(priv, mesg->content.normal.flag);
 369                 break;
 370         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 371                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 372                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 373                 lec_arp_remove(priv, entry);
 374                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 375
 376                 if (mesg->content.normal.no_source_le_narp)
 377                         break;
 378                 /* FALL THROUGH */
 379         case l_arp_update:
 380                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 381                                mesg->content.normal.atm_addr,
 382                                mesg->content.normal.flag,
 383                                mesg->content.normal.targetless_le_arp);
 384                 pr_debug("in l_arp_update\n");
 385                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 386                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 387                                  mesg->sizeoftlvs);
 388                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 389                                             tmp, mesg->sizeoftlvs);
 390                 }
 391                 break;
 392         case l_config:
 393                 priv->maximum_unknown_frame_count =
 394                     mesg->content.config.maximum_unknown_frame_count;
 395                 priv->max_unknown_frame_time =
 396                     (mesg->content.config.max_unknown_frame_time * HZ);
 397                 priv->max_retry_count = mesg->content.config.max_retry_count;
 398                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 399                 priv->forward_delay_time =
 400                     (mesg->content.config.forward_delay_time * HZ);
 401                 priv->arp_response_time =
 402                     (mesg->content.config.arp_response_time * HZ);
 403                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 404                 priv->path_switching_delay =
 405                     (mesg->content.config.path_switching_delay * HZ);
 406                 priv->lane_version = mesg->content.config.lane_version;
 407                                         /* LANE2 */
 408                 priv->lane2_ops = NULL;
 409                 if (priv->lane_version > 1)
 410                         priv->lane2_ops = &lane2_ops;
 411                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 412                         pr_info("%s: change_mtu to %d failed\n",
 413                                 dev->name, mesg->content.config.mtu);
 414                 priv->is_proxy = mesg->content.config.is_proxy;
 415                 break;
 416         case l_flush_tran_id:
 417                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 418                                       mesg->content.normal.flag);
 419                 break;
 420         case l_set_lecid:
 421                 priv->lecid =
 422                     (unsigned short)(0xffff & mesg->content.normal.flag);
 423                 break;
 424         case l_should_bridge:
 425 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 426         {
 427                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 428                          dev->name, mesg->content.proxy.mac_addr);
 429
 430                 if (br_fdb_test_addr_hook == NULL)
 431                         break;
 432
 433                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 434                         /* hit from bridge table, send LE_ARP_RESPONSE */
 435                         struct sk_buff *skb2;
 436                         struct sock *sk;
 437
 438                         pr_debug("%s: entry found, responding to zeppelin\n",
 439                                  dev->name);
 440                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 441                         if (skb2 == NULL)
 442                                 break;
 443                         skb2->len = sizeof(struct atmlec_msg);
 444                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 445                         atm_force_charge(priv->lecd, skb2->truesize);
 446                         sk = sk_atm(priv->lecd);
 447                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 448                         sk->sk_data_ready(sk, skb2->len);
 449                 }
 450         }
 451 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 452                 break;
 453         default:
 454                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 455                 dev_kfree_skb(skb);
 456                 return -EINVAL;
 457         }
 458         dev_kfree_skb(skb);
 459         return 0;
 460 }
 461
 462 static void lec_atm_close(struct atm_vcc *vcc)
 463 {
 464         struct sk_buff *skb;
 465         struct net_device *dev = (struct net_device *)vcc->proto_data;
 466         struct lec_priv *priv = netdev_priv(dev);
 467
 468         priv->lecd = NULL;
 469         /* Do something needful? */
 470
 471         netif_stop_queue(dev);
 472         lec_arp_destroy(priv);
 473
 474         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 475                 pr_info("%s closing with messages pending\n", dev->name);
 476         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 477                 atm_return(vcc, skb->truesize);
 478                 dev_kfree_skb(skb);
 479         }
 480
 481         pr_info("%s: Shut down!\n", dev->name);
 482         module_put(THIS_MODULE);
 483 }
 484
 485 static struct atmdev_ops lecdev_ops = {
 486         .close = lec_atm_close,
 487         .send = lec_atm_send
 488 };
 489
 490 static struct atm_dev lecatm_dev = {
 491         .ops = &lecdev_ops,
 492         .type = "lec",
 493         .number = 999,          /* dummy device number */
 494         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 495 };
 496
 497 /*
 498  * LANE2: new argument struct sk_buff *data contains
 499  * the LE_ARP based TLVs introduced in the LANE2 spec
 500  */
 501 static int
 502 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 503              const unsigned char *mac_addr, const unsigned char *atm_addr,
 504              struct sk_buff *data)
 505 {
 506         struct sock *sk;
 507         struct sk_buff *skb;
 508         struct atmlec_msg *mesg;
 509
 510         if (!priv || !priv->lecd)
 511                 return -1;
 512         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 513         if (!skb)
 514                 return -1;
 515         skb->len = sizeof(struct atmlec_msg);
 516         mesg = (struct atmlec_msg *)skb->data;
 517         memset(mesg, 0, sizeof(struct atmlec_msg));
 518         mesg->type = type;
 519         if (data != NULL)
 520                 mesg->sizeoftlvs = data->len;
 521         if (mac_addr)
 522                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 523         else
 524                 mesg->content.normal.targetless_le_arp = 1;
 525         if (atm_addr)
 526                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 527
 528         atm_force_charge(priv->lecd, skb->truesize);
 529         sk = sk_atm(priv->lecd);
 530         skb_queue_tail(&sk->sk_receive_queue, skb);
 531         sk->sk_data_ready(sk, skb->len);
 532
 533         if (data != NULL) {
 534                 pr_debug("about to send %d bytes of data\n", data->len);
 535                 atm_force_charge(priv->lecd, data->truesize);
 536                 skb_queue_tail(&sk->sk_receive_queue, data);
 537                 sk->sk_data_ready(sk, skb->len);
 538         }
 539
 540         return 0;
 541 }
 542
 543 /* shamelessly stolen from drivers/net/net_init.c */
 544 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 545 {
 546         if ((new_mtu < 68) || (new_mtu > 18190))
 547                 return -EINVAL;
 548         dev->mtu = new_mtu;
 549         return 0;
 550 }
 551
 552 static void lec_set_multicast_list(struct net_device *dev)
 553 {
 554         /*
 555          * by default, all multicast frames arrive over the bus.
 556          * eventually support selective multicast service
 557          */
 558 }
 559
 560 static const struct net_device_ops lec_netdev_ops = {
 561         .ndo_open               = lec_open,
 562         .ndo_stop               = lec_close,
 563         .ndo_start_xmit         = lec_start_xmit,
 564         .ndo_change_mtu         = lec_change_mtu,
 565         .ndo_tx_timeout         = lec_tx_timeout,
 566         .ndo_set_rx_mode        = lec_set_multicast_list,
 567 };
 568
 569 static const unsigned char lec_ctrl_magic[] = {
 570         0xff,
 571         0x00,
 572         0x01,
 573         0x01
 574 };
 575
 576 #define LEC_DATA_DIRECT_8023  2
 577 #define LEC_DATA_DIRECT_8025  3
 578
 579 static int lec_is_data_direct(struct atm_vcc *vcc)
 580 {
 581         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 582                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 583 }
 584
 585 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 586 {
 587         unsigned long flags;
 588         struct net_device *dev = (struct net_device *)vcc->proto_data;
 589         struct lec_priv *priv = netdev_priv(dev);
 590
 591 #if DUMP_PACKETS > 0
 592         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 593                dev->name, vcc->vpi, vcc->vci);
 594 #endif
 595         if (!skb) {
 596                 pr_debug("%s: null skb\n", dev->name);
 597                 lec_vcc_close(priv, vcc);
 598                 return;
 599         }
 600 #if DUMP_PACKETS >= 2
 601 #define MAX_SKB_DUMP 99
 602 #elif DUMP_PACKETS >= 1
 603 #define MAX_SKB_DUMP 30
 604 #endif
 605 #if DUMP_PACKETS > 0
 606         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 607                dev->name, skb->len, priv->lecid);
 608         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 609                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 610 #endif /* DUMP_PACKETS > 0 */
 611         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 612                                 /* Control frame, to daemon */
 613                 struct sock *sk = sk_atm(vcc);
 614
 615                 pr_debug("%s: To daemon\n", dev->name);
 616                 skb_queue_tail(&sk->sk_receive_queue, skb);
 617                 sk->sk_data_ready(sk, skb->len);
 618         } else {                /* Data frame, queue to protocol handlers */
 619                 struct lec_arp_table *entry;
 620                 unsigned char *src, *dst;
 621
 622                 atm_return(vcc, skb->truesize);
 623                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 624                     !priv->lecd || !(dev->flags & IFF_UP)) {
 625                         /*
 626                          * Probably looping back, or if lecd is missing,
 627                          * lecd has gone down
 628                          */
 629                         pr_debug("Ignoring frame...\n");
 630                         dev_kfree_skb(skb);
 631                         return;
 632                 }
 633                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 634
 635                 /*
 636                  * If this is a Data Direct VCC, and the VCC does not match
 637                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 638                  */
 639                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 640                 if (lec_is_data_direct(vcc)) {
 641                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 642                         entry = lec_arp_find(priv, src);
 643                         if (entry && entry->vcc != vcc) {
 644                                 lec_arp_remove(priv, entry);
 645                                 lec_arp_put(entry);
 646                         }
 647                 }
 648                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 649
 650                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 651                     !priv->is_proxy &&  /* Proxy wants all the packets */
 652                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 653                         dev_kfree_skb(skb);
 654                         return;
 655                 }
 656                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 657                         lec_arp_check_empties(priv, vcc, skb);
 658                 skb_pull(skb, 2);       /* skip lec_id */
 659                 skb->protocol = eth_type_trans(skb, dev);
 660                 dev->stats.rx_packets++;
 661                 dev->stats.rx_bytes += skb->len;
 662                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 663                 netif_rx(skb);
 664         }
 665 }
 666
 667 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 668 {
 669         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 670         struct net_device *dev = skb->dev;
 671
 672         if (vpriv == NULL) {
 673                 pr_info("vpriv = NULL!?!?!?\n");
 674                 return;
 675         }
 676
 677         vpriv->old_pop(vcc, skb);
 678
 679         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 680                 vpriv->xoff = 0;
 681                 if (netif_running(dev) && netif_queue_stopped(dev))
 682                         netif_wake_queue(dev);
 683         }
 684 }
 685
 686 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 687 {
 688         struct lec_vcc_priv *vpriv;
 689         int bytes_left;
 690         struct atmlec_ioc ioc_data;
 691
 692         /* Lecd must be up in this case */
 693         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 694         if (bytes_left != 0)
 695                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 696         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 697             !dev_lec[ioc_data.dev_num])
 698                 return -EINVAL;
 699         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 700         if (!vpriv)
 701                 return -ENOMEM;
 702         vpriv->xoff = 0;
 703         vpriv->old_pop = vcc->pop;
 704         vcc->user_back = vpriv;
 705         vcc->pop = lec_pop;
 706         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 707                       &ioc_data, vcc, vcc->push);
 708         vcc->proto_data = dev_lec[ioc_data.dev_num];
 709         vcc->push = lec_push;
 710         return 0;
 711 }
 712
 713 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 714 {
 715         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 716                 return -EINVAL;
 717         vcc->proto_data = dev_lec[arg];
 718         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 719 }
 720
 721 /* Initialize device. */
 722 static int lecd_attach(struct atm_vcc *vcc, int arg)
 723 {
 724         int i;
 725         struct lec_priv *priv;
 726
 727         if (arg < 0)
 728                 i = 0;
 729         else
 730                 i = arg;
 731         if (arg >= MAX_LEC_ITF)
 732                 return -EINVAL;
 733         if (!dev_lec[i]) {
 734                 int size;
 735
 736                 size = sizeof(struct lec_priv);
 737                 dev_lec[i] = alloc_etherdev(size);
 738                 if (!dev_lec[i])
 739                         return -ENOMEM;
 740                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 741                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 742                 if (register_netdev(dev_lec[i])) {
 743                         free_netdev(dev_lec[i]);
 744                         return -EINVAL;
 745                 }
 746
 747                 priv = netdev_priv(dev_lec[i]);
 748         } else {
 749                 priv = netdev_priv(dev_lec[i]);
 750                 if (priv->lecd)
 751                         return -EADDRINUSE;
 752         }
 753         lec_arp_init(priv);
 754         priv->itfnum = i;       /* LANE2 addition */
 755         priv->lecd = vcc;
 756         vcc->dev = &lecatm_dev;
 757         vcc_insert_socket(sk_atm(vcc));
 758
 759         vcc->proto_data = dev_lec[i];
 760         set_bit(ATM_VF_META, &vcc->flags);
 761         set_bit(ATM_VF_READY, &vcc->flags);
 762
 763         /* Set default values to these variables */
 764         priv->maximum_unknown_frame_count = 1;
 765         priv->max_unknown_frame_time = (1 * HZ);
 766         priv->vcc_timeout_period = (1200 * HZ);
 767         priv->max_retry_count = 1;
 768         priv->aging_time = (300 * HZ);
 769         priv->forward_delay_time = (15 * HZ);
 770         priv->topology_change = 0;
 771         priv->arp_response_time = (1 * HZ);
 772         priv->flush_timeout = (4 * HZ);
 773         priv->path_switching_delay = (6 * HZ);
 774
 775         if (dev_lec[i]->flags & IFF_UP)
 776                 netif_start_queue(dev_lec[i]);
 777         __module_get(THIS_MODULE);
 778         return i;
 779 }
 780
 781 #ifdef CONFIG_PROC_FS
 782 static const char *lec_arp_get_status_string(unsigned char status)
 783 {
 784         static const char *const lec_arp_status_string[] = {
 785                 "ESI_UNKNOWN       ",
 786                 "ESI_ARP_PENDING   ",
 787                 "ESI_VC_PENDING    ",
 788                 "<Undefined>       ",
 789                 "ESI_FLUSH_PENDING ",
 790                 "ESI_FORWARD_DIRECT"
 791         };
 792
 793         if (status > ESI_FORWARD_DIRECT)
 794                 status = 3;     /* ESI_UNDEFINED */
 795         return lec_arp_status_string[status];
 796 }
 797
 798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 799 {
 800         int i;
 801
 802         for (i = 0; i < ETH_ALEN; i++)
 803                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 804         seq_printf(seq, " ");
 805         for (i = 0; i < ATM_ESA_LEN; i++)
 806                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 807         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 808                    entry->flags & 0xffff);
 809         if (entry->vcc)
 810                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 811         else
 812                 seq_printf(seq, "        ");
 813         if (entry->recv_vcc) {
 814                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 815                            entry->recv_vcc->vci);
 816         }
 817         seq_putc(seq, '\n');
 818 }
 819
 820 struct lec_state {
 821         unsigned long flags;
 822         struct lec_priv *locked;
 823         struct hlist_node *node;
 824         struct net_device *dev;
 825         int itf;
 826         int arp_table;
 827         int misc_table;
 828 };
 829
 830 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 831                           loff_t *l)
 832 {
 833         struct hlist_node *e = state->node;
 834         struct lec_arp_table *tmp;
 835
 836         if (!e)
 837                 e = tbl->first;
 838         if (e == SEQ_START_TOKEN) {
 839                 e = tbl->first;
 840                 --*l;
 841         }
 842
 843         hlist_for_each_entry_from(tmp, e, next) {
 844                 if (--*l < 0)
 845                         break;
 846         }
 847         state->node = e;
 848
 849         return (*l < 0) ? state : NULL;
 850 }
 851
 852 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 853                           struct lec_priv *priv)
 854 {
 855         void *v = NULL;
 856         int p;
 857
 858         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 859                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 860                 if (v)
 861                         break;
 862         }
 863         state->arp_table = p;
 864         return v;
 865 }
 866
 867 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 868                            struct lec_priv *priv)
 869 {
 870         struct hlist_head *lec_misc_tables[] = {
 871                 &priv->lec_arp_empty_ones,
 872                 &priv->lec_no_forward,
 873                 &priv->mcast_fwds
 874         };
 875         void *v = NULL;
 876         int q;
 877
 878         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 879                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
 880                 if (v)
 881                         break;
 882         }
 883         state->misc_table = q;
 884         return v;
 885 }
 886
 887 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 888                            struct lec_priv *priv)
 889 {
 890         if (!state->locked) {
 891                 state->locked = priv;
 892                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 893         }
 894         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 895                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 896                 state->locked = NULL;
 897                 /* Partial state reset for the next time we get called */
 898                 state->arp_table = state->misc_table = 0;
 899         }
 900         return state->locked;
 901 }
 902
 903 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 904 {
 905         struct net_device *dev;
 906         void *v;
 907
 908         dev = state->dev ? state->dev : dev_lec[state->itf];
 909         v = (dev && netdev_priv(dev)) ?
 910                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 911         if (!v && dev) {
 912                 dev_put(dev);
 913                 /* Partial state reset for the next time we get called */
 914                 dev = NULL;
 915         }
 916         state->dev = dev;
 917         return v;
 918 }
 919
 920 static void *lec_get_idx(struct lec_state *state, loff_t l)
 921 {
 922         void *v = NULL;
 923
 924         for (; state->itf < MAX_LEC_ITF; state->itf++) {
 925                 v = lec_itf_walk(state, &l);
 926                 if (v)
 927                         break;
 928         }
 929         return v;
 930 }
 931
 932 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 933 {
 934         struct lec_state *state = seq->private;
 935
 936         state->itf = 0;
 937         state->dev = NULL;
 938         state->locked = NULL;
 939         state->arp_table = 0;
 940         state->misc_table = 0;
 941         state->node = SEQ_START_TOKEN;
 942
 943         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 944 }
 945
 946 static void lec_seq_stop(struct seq_file *seq, void *v)
 947 {
 948         struct lec_state *state = seq->private;
 949
 950         if (state->dev) {
 951                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 952                                        state->flags);
 953                 dev_put(state->dev);
 954         }
 955 }
 956
 957 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 958 {
 959         struct lec_state *state = seq->private;
 960
 961         v = lec_get_idx(state, 1);
 962         *pos += !!PTR_ERR(v);
 963         return v;
 964 }
 965
 966 static int lec_seq_show(struct seq_file *seq, void *v)
 967 {
 968         static const char lec_banner[] =
 969             "Itf  MAC          ATM destination"
 970             "                          Status            Flags "
 971             "VPI/VCI Recv VPI/VCI\n";
 972
 973         if (v == SEQ_START_TOKEN)
 974                 seq_puts(seq, lec_banner);
 975         else {
 976                 struct lec_state *state = seq->private;
 977                 struct net_device *dev = state->dev;
 978                 struct lec_arp_table *entry = hlist_entry(state->node,
 979                                                           struct lec_arp_table,
 980                                                           next);
 981
 982                 seq_printf(seq, "%s ", dev->name);
 983                 lec_info(seq, entry);
 984         }
 985         return 0;
 986 }
 987
 988 static const struct seq_operations lec_seq_ops = {
 989         .start = lec_seq_start,
 990         .next = lec_seq_next,
 991         .stop = lec_seq_stop,
 992         .show = lec_seq_show,
 993 };
 994
 995 static int lec_seq_open(struct inode *inode, struct file *file)
 996 {
 997         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
 998 }
 999
1000 static const struct file_operations lec_seq_fops = {
1001         .owner = THIS_MODULE,
1002         .open = lec_seq_open,
1003         .read = seq_read,
1004         .llseek = seq_lseek,
1005         .release = seq_release_private,
1006 };
1007 #endif
1008
1009 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1010 {
1011         struct atm_vcc *vcc = ATM_SD(sock);
1012         int err = 0;
1013
1014         switch (cmd) {
1015         case ATMLEC_CTRL:
1016         case ATMLEC_MCAST:
1017         case ATMLEC_DATA:
1018                 if (!capable(CAP_NET_ADMIN))
1019                         return -EPERM;
1020                 break;
1021         default:
1022                 return -ENOIOCTLCMD;
1023         }
1024
1025         switch (cmd) {
1026         case ATMLEC_CTRL:
1027                 err = lecd_attach(vcc, (int)arg);
1028                 if (err >= 0)
1029                         sock->state = SS_CONNECTED;
1030                 break;
1031         case ATMLEC_MCAST:
1032                 err = lec_mcast_attach(vcc, (int)arg);
1033                 break;
1034         case ATMLEC_DATA:
1035                 err = lec_vcc_attach(vcc, (void __user *)arg);
1036                 break;
1037         }
1038
1039         return err;
1040 }
1041
1042 static struct atm_ioctl lane_ioctl_ops = {
1043         .owner = THIS_MODULE,
1044         .ioctl = lane_ioctl,
1045 };
1046
1047 static int __init lane_module_init(void)
1048 {
1049 #ifdef CONFIG_PROC_FS
1050         struct proc_dir_entry *p;
1051
1052         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1053         if (!p) {
1054                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1055                 return -ENOMEM;
1056         }
1057 #endif
1058
1059         register_atm_ioctl(&lane_ioctl_ops);
1060         pr_info("lec.c: initialized\n");
1061         return 0;
1062 }
1063
1064 static void __exit lane_module_cleanup(void)
1065 {
1066         int i;
1067
1068         remove_proc_entry("lec", atm_proc_root);
1069
1070         deregister_atm_ioctl(&lane_ioctl_ops);
1071
1072         for (i = 0; i < MAX_LEC_ITF; i++) {
1073                 if (dev_lec[i] != NULL) {
1074                         unregister_netdev(dev_lec[i]);
1075                         free_netdev(dev_lec[i]);
1076                         dev_lec[i] = NULL;
1077                 }
1078         }
1079 }
1080
1081 module_init(lane_module_init);
1082 module_exit(lane_module_cleanup);
1083
1084 /*
1085  * LANE2: 3.1.3, LE_RESOLVE.request
1086  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1087  * If sizeoftlvs == NULL the default TLVs associated with with this
1088  * lec will be used.
1089  * If dst_mac == NULL, targetless LE_ARP will be sent
1090  */
1091 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1092                          u8 **tlvs, u32 *sizeoftlvs)
1093 {
1094         unsigned long flags;
1095         struct lec_priv *priv = netdev_priv(dev);
1096         struct lec_arp_table *table;
1097         struct sk_buff *skb;
1098         int retval;
1099
1100         if (force == 0) {
1101                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1102                 table = lec_arp_find(priv, dst_mac);
1103                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1104                 if (table == NULL)
1105                         return -1;
1106
1107                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1108                 if (*tlvs == NULL)
1109                         return -1;
1110
1111                 *sizeoftlvs = table->sizeoftlvs;
1112
1113                 return 0;
1114         }
1115
1116         if (sizeoftlvs == NULL)
1117                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1118
1119         else {
1120                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1121                 if (skb == NULL)
1122                         return -1;
1123                 skb->len = *sizeoftlvs;
1124                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1125                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1126         }
1127         return retval;
1128 }
1129
1130 /*
1131  * LANE2: 3.1.4, LE_ASSOCIATE.request
1132  * Associate the *tlvs with the *lan_dst address.
1133  * Will overwrite any previous association
1134  * Returns 1 for success, 0 for failure (out of memory)
1135  *
1136  */
1137 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1138                                const u8 *tlvs, u32 sizeoftlvs)
1139 {
1140         int retval;
1141         struct sk_buff *skb;
1142         struct lec_priv *priv = netdev_priv(dev);
1143
1144         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1145                 return 0;       /* not our mac address */
1146
1147         kfree(priv->tlvs);      /* NULL if there was no previous association */
1148
1149         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1150         if (priv->tlvs == NULL)
1151                 return 0;
1152         priv->sizeoftlvs = sizeoftlvs;
1153
1154         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1155         if (skb == NULL)
1156                 return 0;
1157         skb->len = sizeoftlvs;
1158         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1159         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1160         if (retval != 0)
1161                 pr_info("lec.c: lane2_associate_req() failed\n");
1162         /*
1163          * If the previous association has changed we must
1164          * somehow notify other LANE entities about the change
1165          */
1166         return 1;
1167 }
1168
1169 /*
1170  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1171  *
1172  */
1173 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1174                                 const u8 *tlvs, u32 sizeoftlvs)
1175 {
1176 #if 0
1177         int i = 0;
1178 #endif
1179         struct lec_priv *priv = netdev_priv(dev);
1180 #if 0                           /*
1181                                  * Why have the TLVs in LE_ARP entries
1182                                  * since we do not use them? When you
1183                                  * uncomment this code, make sure the
1184                                  * TLVs get freed when entry is killed
1185                                  */
1186         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1187
1188         if (entry == NULL)
1189                 return;         /* should not happen */
1190
1191         kfree(entry->tlvs);
1192
1193         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1194         if (entry->tlvs == NULL)
1195                 return;
1196         entry->sizeoftlvs = sizeoftlvs;
1197 #endif
1198 #if 0
1199         pr_info("\n");
1200         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1201         while (i < sizeoftlvs)
1202                 pr_cont("%02x ", tlvs[i++]);
1203
1204         pr_cont("\n");
1205 #endif
1206
1207         /* tell MPOA about the TLVs we saw */
1208         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1209                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1210                                                      tlvs, sizeoftlvs);
1211         }
1212 }
1213
1214 /*
1215  * Here starts what used to lec_arpc.c
1216  *
1217  * lec_arpc.c was added here when making
1218  * lane client modular. October 1997
1219  */
1220
1221 #include <linux/types.h>
1222 #include <linux/timer.h>
1223 #include <linux/param.h>
1224 #include <linux/atomic.h>
1225 #include <linux/inetdevice.h>
1226 #include <net/route.h>
1227
1228 #if 0
1229 #define pr_debug(format, args...)
1230 /*
1231   #define pr_debug printk
1232 */
1233 #endif
1234 #define DEBUG_ARP_TABLE 0
1235
1236 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1237
1238 static void lec_arp_check_expire(struct work_struct *work);
1239 static void lec_arp_expire_arp(unsigned long data);
1240
1241 /*
1242  * Arp table funcs
1243  */
1244
1245 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1246
1247 /*
1248  * Initialization of arp-cache
1249  */
1250 static void lec_arp_init(struct lec_priv *priv)
1251 {
1252         unsigned short i;
1253
1254         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1255                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1256         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1257         INIT_HLIST_HEAD(&priv->lec_no_forward);
1258         INIT_HLIST_HEAD(&priv->mcast_fwds);
1259         spin_lock_init(&priv->lec_arp_lock);
1260         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1261         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1262 }
1263
1264 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1265 {
1266         if (entry->vcc) {
1267                 struct atm_vcc *vcc = entry->vcc;
1268                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1269                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1270
1271                 vcc->pop = vpriv->old_pop;
1272                 if (vpriv->xoff)
1273                         netif_wake_queue(dev);
1274                 kfree(vpriv);
1275                 vcc->user_back = NULL;
1276                 vcc->push = entry->old_push;
1277                 vcc_release_async(vcc, -EPIPE);
1278                 entry->vcc = NULL;
1279         }
1280         if (entry->recv_vcc) {
1281                 entry->recv_vcc->push = entry->old_recv_push;
1282                 vcc_release_async(entry->recv_vcc, -EPIPE);
1283                 entry->recv_vcc = NULL;
1284         }
1285 }
1286
1287 /*
1288  * Insert entry to lec_arp_table
1289  * LANE2: Add to the end of the list to satisfy 8.1.13
1290  */
1291 static inline void
1292 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1293 {
1294         struct hlist_head *tmp;
1295
1296         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1297         hlist_add_head(&entry->next, tmp);
1298
1299         pr_debug("Added entry:%pM\n", entry->mac_addr);
1300 }
1301
1302 /*
1303  * Remove entry from lec_arp_table
1304  */
1305 static int
1306 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1307 {
1308         struct hlist_node *node;
1309         struct lec_arp_table *entry;
1310         int i, remove_vcc = 1;
1311
1312         if (!to_remove)
1313                 return -1;
1314
1315         hlist_del(&to_remove->next);
1316         del_timer(&to_remove->timer);
1317
1318         /*
1319          * If this is the only MAC connected to this VCC,
1320          * also tear down the VCC
1321          */
1322         if (to_remove->status >= ESI_FLUSH_PENDING) {
1323                 /*
1324                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1325                  */
1326                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1327                         hlist_for_each_entry(entry, node,
1328                                              &priv->lec_arp_tables[i], next) {
1329                                 if (memcmp(to_remove->atm_addr,
1330                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1331                                         remove_vcc = 0;
1332                                         break;
1333                                 }
1334                         }
1335                 }
1336                 if (remove_vcc)
1337                         lec_arp_clear_vccs(to_remove);
1338         }
1339         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1340
1341         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1342         return 0;
1343 }
1344
1345 #if DEBUG_ARP_TABLE
1346 static const char *get_status_string(unsigned char st)
1347 {
1348         switch (st) {
1349         case ESI_UNKNOWN:
1350                 return "ESI_UNKNOWN";
1351         case ESI_ARP_PENDING:
1352                 return "ESI_ARP_PENDING";
1353         case ESI_VC_PENDING:
1354                 return "ESI_VC_PENDING";
1355         case ESI_FLUSH_PENDING:
1356                 return "ESI_FLUSH_PENDING";
1357         case ESI_FORWARD_DIRECT:
1358                 return "ESI_FORWARD_DIRECT";
1359         }
1360         return "<UNKNOWN>";
1361 }
1362
1363 static void dump_arp_table(struct lec_priv *priv)
1364 {
1365         struct hlist_node *node;
1366         struct lec_arp_table *rulla;
1367         char buf[256];
1368         int i, j, offset;
1369
1370         pr_info("Dump %p:\n", priv);
1371         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1372                 hlist_for_each_entry(rulla, node,
1373                                      &priv->lec_arp_tables[i], next) {
1374                         offset = 0;
1375                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1376                         offset += sprintf(buf + offset, "Mac: %pM",
1377                                           rulla->mac_addr);
1378                         offset += sprintf(buf + offset, " Atm:");
1379                         for (j = 0; j < ATM_ESA_LEN; j++) {
1380                                 offset += sprintf(buf + offset,
1381                                                   "%2.2x ",
1382                                                   rulla->atm_addr[j] & 0xff);
1383                         }
1384                         offset += sprintf(buf + offset,
1385                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1386                                           rulla->vcc ? rulla->vcc->vpi : 0,
1387                                           rulla->vcc ? rulla->vcc->vci : 0,
1388                                           rulla->recv_vcc ? rulla->recv_vcc->
1389                                           vpi : 0,
1390                                           rulla->recv_vcc ? rulla->recv_vcc->
1391                                           vci : 0, rulla->last_used,
1392                                           rulla->timestamp, rulla->no_tries);
1393                         offset +=
1394                             sprintf(buf + offset,
1395                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1396                                     rulla->flags, rulla->packets_flooded,
1397                                     get_status_string(rulla->status));
1398                         pr_info("%s\n", buf);
1399                 }
1400         }
1401
1402         if (!hlist_empty(&priv->lec_no_forward))
1403                 pr_info("No forward\n");
1404         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1405                 offset = 0;
1406                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1407                 offset += sprintf(buf + offset, " Atm:");
1408                 for (j = 0; j < ATM_ESA_LEN; j++) {
1409                         offset += sprintf(buf + offset, "%2.2x ",
1410                                           rulla->atm_addr[j] & 0xff);
1411                 }
1412                 offset += sprintf(buf + offset,
1413                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1414                                   rulla->vcc ? rulla->vcc->vpi : 0,
1415                                   rulla->vcc ? rulla->vcc->vci : 0,
1416                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1417                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1418                                   rulla->last_used,
1419                                   rulla->timestamp, rulla->no_tries);
1420                 offset += sprintf(buf + offset,
1421                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1422                                   rulla->flags, rulla->packets_flooded,
1423                                   get_status_string(rulla->status));
1424                 pr_info("%s\n", buf);
1425         }
1426
1427         if (!hlist_empty(&priv->lec_arp_empty_ones))
1428                 pr_info("Empty ones\n");
1429         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1430                 offset = 0;
1431                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1432                 offset += sprintf(buf + offset, " Atm:");
1433                 for (j = 0; j < ATM_ESA_LEN; j++) {
1434                         offset += sprintf(buf + offset, "%2.2x ",
1435                                           rulla->atm_addr[j] & 0xff);
1436                 }
1437                 offset += sprintf(buf + offset,
1438                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1439                                   rulla->vcc ? rulla->vcc->vpi : 0,
1440                                   rulla->vcc ? rulla->vcc->vci : 0,
1441                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1442                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1443                                   rulla->last_used,
1444                                   rulla->timestamp, rulla->no_tries);
1445                 offset += sprintf(buf + offset,
1446                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1447                                   rulla->flags, rulla->packets_flooded,
1448                                   get_status_string(rulla->status));
1449                 pr_info("%s", buf);
1450         }
1451
1452         if (!hlist_empty(&priv->mcast_fwds))
1453                 pr_info("Multicast Forward VCCs\n");
1454         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1455                 offset = 0;
1456                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1457                 offset += sprintf(buf + offset, " Atm:");
1458                 for (j = 0; j < ATM_ESA_LEN; j++) {
1459                         offset += sprintf(buf + offset, "%2.2x ",
1460                                           rulla->atm_addr[j] & 0xff);
1461                 }
1462                 offset += sprintf(buf + offset,
1463                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1464                                   rulla->vcc ? rulla->vcc->vpi : 0,
1465                                   rulla->vcc ? rulla->vcc->vci : 0,
1466                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1467                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1468                                   rulla->last_used,
1469                                   rulla->timestamp, rulla->no_tries);
1470                 offset += sprintf(buf + offset,
1471                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1472                                   rulla->flags, rulla->packets_flooded,
1473                                   get_status_string(rulla->status));
1474                 pr_info("%s\n", buf);
1475         }
1476
1477 }
1478 #else
1479 #define dump_arp_table(priv) do { } while (0)
1480 #endif
1481
1482 /*
1483  * Destruction of arp-cache
1484  */
1485 static void lec_arp_destroy(struct lec_priv *priv)
1486 {
1487         unsigned long flags;
1488         struct hlist_node *node, *next;
1489         struct lec_arp_table *entry;
1490         int i;
1491
1492         cancel_delayed_work_sync(&priv->lec_arp_work);
1493
1494         /*
1495          * Remove all entries
1496          */
1497
1498         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1499         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1500                 hlist_for_each_entry_safe(entry, node, next,
1501                                           &priv->lec_arp_tables[i], next) {
1502                         lec_arp_remove(priv, entry);
1503                         lec_arp_put(entry);
1504                 }
1505                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1506         }
1507
1508         hlist_for_each_entry_safe(entry, node, next,
1509                                   &priv->lec_arp_empty_ones, next) {
1510                 del_timer_sync(&entry->timer);
1511                 lec_arp_clear_vccs(entry);
1512                 hlist_del(&entry->next);
1513                 lec_arp_put(entry);
1514         }
1515         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1516
1517         hlist_for_each_entry_safe(entry, node, next,
1518                                   &priv->lec_no_forward, next) {
1519                 del_timer_sync(&entry->timer);
1520                 lec_arp_clear_vccs(entry);
1521                 hlist_del(&entry->next);
1522                 lec_arp_put(entry);
1523         }
1524         INIT_HLIST_HEAD(&priv->lec_no_forward);
1525
1526         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1527                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1528                 lec_arp_clear_vccs(entry);
1529                 hlist_del(&entry->next);
1530                 lec_arp_put(entry);
1531         }
1532         INIT_HLIST_HEAD(&priv->mcast_fwds);
1533         priv->mcast_vcc = NULL;
1534         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1535 }
1536
1537 /*
1538  * Find entry by mac_address
1539  */
1540 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1541                                           const unsigned char *mac_addr)
1542 {
1543         struct hlist_node *node;
1544         struct hlist_head *head;
1545         struct lec_arp_table *entry;
1546
1547         pr_debug("%pM\n", mac_addr);
1548
1549         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1550         hlist_for_each_entry(entry, node, head, next) {
1551                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1552                         return entry;
1553         }
1554         return NULL;
1555 }
1556
1557 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1558                                         const unsigned char *mac_addr)
1559 {
1560         struct lec_arp_table *to_return;
1561
1562         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1563         if (!to_return) {
1564                 pr_info("LEC: Arp entry kmalloc failed\n");
1565                 return NULL;
1566         }
1567         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1568         INIT_HLIST_NODE(&to_return->next);
1569         setup_timer(&to_return->timer, lec_arp_expire_arp,
1570                         (unsigned long)to_return);
1571         to_return->last_used = jiffies;
1572         to_return->priv = priv;
1573         skb_queue_head_init(&to_return->tx_wait);
1574         atomic_set(&to_return->usage, 1);
1575         return to_return;
1576 }
1577
1578 /* Arp sent timer expired */
1579 static void lec_arp_expire_arp(unsigned long data)
1580 {
1581         struct lec_arp_table *entry;
1582
1583         entry = (struct lec_arp_table *)data;
1584
1585         pr_debug("\n");
1586         if (entry->status == ESI_ARP_PENDING) {
1587                 if (entry->no_tries <= entry->priv->max_retry_count) {
1588                         if (entry->is_rdesc)
1589                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1590                                              entry->mac_addr, NULL, NULL);
1591                         else
1592                                 send_to_lecd(entry->priv, l_arp_xmt,
1593                                              entry->mac_addr, NULL, NULL);
1594                         entry->no_tries++;
1595                 }
1596                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1597         }
1598 }
1599
1600 /* Unknown/unused vcc expire, remove associated entry */
1601 static void lec_arp_expire_vcc(unsigned long data)
1602 {
1603         unsigned long flags;
1604         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1605         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1606
1607         del_timer(&to_remove->timer);
1608
1609         pr_debug("%p %p: vpi:%d vci:%d\n",
1610                  to_remove, priv,
1611                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1612                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1613
1614         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1615         hlist_del(&to_remove->next);
1616         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1617
1618         lec_arp_clear_vccs(to_remove);
1619         lec_arp_put(to_remove);
1620 }
1621
1622 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1623                                    unsigned long now,
1624                                    struct lec_priv *priv)
1625 {
1626         unsigned long time_to_check;
1627
1628         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1629                 time_to_check = priv->forward_delay_time;
1630         else
1631                 time_to_check = priv->aging_time;
1632
1633         pr_debug("About to expire: %lx - %lx > %lx\n",
1634                  now, entry->last_used, time_to_check);
1635         if (time_after(now, entry->last_used + time_to_check) &&
1636             !(entry->flags & LEC_PERMANENT_FLAG) &&
1637             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1638                 /* Remove entry */
1639                 pr_debug("Entry timed out\n");
1640                 lec_arp_remove(priv, entry);
1641                 lec_arp_put(entry);
1642         } else {
1643                 /* Something else */
1644                 if ((entry->status == ESI_VC_PENDING ||
1645                      entry->status == ESI_ARP_PENDING) &&
1646                     time_after_eq(now, entry->timestamp +
1647                                        priv->max_unknown_frame_time)) {
1648                         entry->timestamp = jiffies;
1649                         entry->packets_flooded = 0;
1650                         if (entry->status == ESI_VC_PENDING)
1651                                 send_to_lecd(priv, l_svc_setup,
1652                                              entry->mac_addr,
1653                                              entry->atm_addr,
1654                                              NULL);
1655                 }
1656                 if (entry->status == ESI_FLUSH_PENDING &&
1657                     time_after_eq(now, entry->timestamp +
1658                                        priv->path_switching_delay)) {
1659                         lec_arp_hold(entry);
1660                         return true;
1661                 }
1662         }
1663
1664         return false;
1665 }
1666 /*
1667  * Expire entries.
1668  * 1. Re-set timer
1669  * 2. For each entry, delete entries that have aged past the age limit.
1670  * 3. For each entry, depending on the status of the entry, perform
1671  *    the following maintenance.
1672  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1673  *       tick_count is above the max_unknown_frame_time, clear
1674  *       the tick_count to zero and clear the packets_flooded counter
1675  *       to zero. This supports the packet rate limit per address
1676  *       while flooding unknowns.
1677  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1678  *       than or equal to the path_switching_delay, change the status
1679  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1680  *       regardless of the progress of the flush protocol.
1681  */
1682 static void lec_arp_check_expire(struct work_struct *work)
1683 {
1684         unsigned long flags;
1685         struct lec_priv *priv =
1686                 container_of(work, struct lec_priv, lec_arp_work.work);
1687         struct hlist_node *node, *next;
1688         struct lec_arp_table *entry;
1689         unsigned long now;
1690         int i;
1691
1692         pr_debug("%p\n", priv);
1693         now = jiffies;
1694 restart:
1695         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1696         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1697                 hlist_for_each_entry_safe(entry, node, next,
1698                                           &priv->lec_arp_tables[i], next) {
1699                         if (__lec_arp_check_expire(entry, now, priv)) {
1700                                 struct sk_buff *skb;
1701                                 struct atm_vcc *vcc = entry->vcc;
1702
1703                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1704                                                        flags);
1705                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1706                                         lec_send(vcc, skb);
1707                                 entry->last_used = jiffies;
1708                                 entry->status = ESI_FORWARD_DIRECT;
1709                                 lec_arp_put(entry);
1710
1711                                 goto restart;
1712                         }
1713                 }
1714         }
1715         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1716
1717         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1718 }
1719
1720 /*
1721  * Try to find vcc where mac_address is attached.
1722  *
1723  */
1724 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1725                                        const unsigned char *mac_to_find,
1726                                        int is_rdesc,
1727                                        struct lec_arp_table **ret_entry)
1728 {
1729         unsigned long flags;
1730         struct lec_arp_table *entry;
1731         struct atm_vcc *found;
1732
1733         if (mac_to_find[0] & 0x01) {
1734                 switch (priv->lane_version) {
1735                 case 1:
1736                         return priv->mcast_vcc;
1737                 case 2: /* LANE2 wants arp for multicast addresses */
1738                         if (ether_addr_equal(mac_to_find, bus_mac))
1739                                 return priv->mcast_vcc;
1740                         break;
1741                 default:
1742                         break;
1743                 }
1744         }
1745
1746         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1747         entry = lec_arp_find(priv, mac_to_find);
1748
1749         if (entry) {
1750                 if (entry->status == ESI_FORWARD_DIRECT) {
1751                         /* Connection Ok */
1752                         entry->last_used = jiffies;
1753                         lec_arp_hold(entry);
1754                         *ret_entry = entry;
1755                         found = entry->vcc;
1756                         goto out;
1757                 }
1758                 /*
1759                  * If the LE_ARP cache entry is still pending, reset count to 0
1760                  * so another LE_ARP request can be made for this frame.
1761                  */
1762                 if (entry->status == ESI_ARP_PENDING)
1763                         entry->no_tries = 0;
1764                 /*
1765                  * Data direct VC not yet set up, check to see if the unknown
1766                  * frame count is greater than the limit. If the limit has
1767                  * not been reached, allow the caller to send packet to
1768                  * BUS.
1769                  */
1770                 if (entry->status != ESI_FLUSH_PENDING &&
1771                     entry->packets_flooded <
1772                     priv->maximum_unknown_frame_count) {
1773                         entry->packets_flooded++;
1774                         pr_debug("Flooding..\n");
1775                         found = priv->mcast_vcc;
1776                         goto out;
1777                 }
1778                 /*
1779                  * We got here because entry->status == ESI_FLUSH_PENDING
1780                  * or BUS flood limit was reached for an entry which is
1781                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1782                  */
1783                 lec_arp_hold(entry);
1784                 *ret_entry = entry;
1785                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1786                          entry->vcc);
1787                 found = NULL;
1788         } else {
1789                 /* No matching entry was found */
1790                 entry = make_entry(priv, mac_to_find);
1791                 pr_debug("Making entry\n");
1792                 if (!entry) {
1793                         found = priv->mcast_vcc;
1794                         goto out;
1795                 }
1796                 lec_arp_add(priv, entry);
1797                 /* We want arp-request(s) to be sent */
1798                 entry->packets_flooded = 1;
1799                 entry->status = ESI_ARP_PENDING;
1800                 entry->no_tries = 1;
1801                 entry->last_used = entry->timestamp = jiffies;
1802                 entry->is_rdesc = is_rdesc;
1803                 if (entry->is_rdesc)
1804                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1805                                      NULL);
1806                 else
1807                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1808                 entry->timer.expires = jiffies + (1 * HZ);
1809                 entry->timer.function = lec_arp_expire_arp;
1810                 add_timer(&entry->timer);
1811                 found = priv->mcast_vcc;
1812         }
1813
1814 out:
1815         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1816         return found;
1817 }
1818
1819 static int
1820 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1821                 unsigned long permanent)
1822 {
1823         unsigned long flags;
1824         struct hlist_node *node, *next;
1825         struct lec_arp_table *entry;
1826         int i;
1827
1828         pr_debug("\n");
1829         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1830         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1831                 hlist_for_each_entry_safe(entry, node, next,
1832                                           &priv->lec_arp_tables[i], next) {
1833                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1834                             (permanent ||
1835                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1836                                 lec_arp_remove(priv, entry);
1837                                 lec_arp_put(entry);
1838                         }
1839                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1840                         return 0;
1841                 }
1842         }
1843         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1844         return -1;
1845 }
1846
1847 /*
1848  * Notifies:  Response to arp_request (atm_addr != NULL)
1849  */
1850 static void
1851 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1852                const unsigned char *atm_addr, unsigned long remoteflag,
1853                unsigned int targetless_le_arp)
1854 {
1855         unsigned long flags;
1856         struct hlist_node *node, *next;
1857         struct lec_arp_table *entry, *tmp;
1858         int i;
1859
1860         pr_debug("%smac:%pM\n",
1861                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1862
1863         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1864         entry = lec_arp_find(priv, mac_addr);
1865         if (entry == NULL && targetless_le_arp)
1866                 goto out;       /*
1867                                  * LANE2: ignore targetless LE_ARPs for which
1868                                  * we have no entry in the cache. 7.1.30
1869                                  */
1870         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1871                 hlist_for_each_entry_safe(entry, node, next,
1872                                           &priv->lec_arp_empty_ones, next) {
1873                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1874                                 hlist_del(&entry->next);
1875                                 del_timer(&entry->timer);
1876                                 tmp = lec_arp_find(priv, mac_addr);
1877                                 if (tmp) {
1878                                         del_timer(&tmp->timer);
1879                                         tmp->status = ESI_FORWARD_DIRECT;
1880                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1881                                         tmp->vcc = entry->vcc;
1882                                         tmp->old_push = entry->old_push;
1883                                         tmp->last_used = jiffies;
1884                                         del_timer(&entry->timer);
1885                                         lec_arp_put(entry);
1886                                         entry = tmp;
1887                                 } else {
1888                                         entry->status = ESI_FORWARD_DIRECT;
1889                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
1890                                         entry->last_used = jiffies;
1891                                         lec_arp_add(priv, entry);
1892                                 }
1893                                 if (remoteflag)
1894                                         entry->flags |= LEC_REMOTE_FLAG;
1895                                 else
1896                                         entry->flags &= ~LEC_REMOTE_FLAG;
1897                                 pr_debug("After update\n");
1898                                 dump_arp_table(priv);
1899                                 goto out;
1900                         }
1901                 }
1902         }
1903
1904         entry = lec_arp_find(priv, mac_addr);
1905         if (!entry) {
1906                 entry = make_entry(priv, mac_addr);
1907                 if (!entry)
1908                         goto out;
1909                 entry->status = ESI_UNKNOWN;
1910                 lec_arp_add(priv, entry);
1911                 /* Temporary, changes before end of function */
1912         }
1913         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1914         del_timer(&entry->timer);
1915         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1916                 hlist_for_each_entry(tmp, node,
1917                                      &priv->lec_arp_tables[i], next) {
1918                         if (entry != tmp &&
1919                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1920                                 /* Vcc to this host exists */
1921                                 if (tmp->status > ESI_VC_PENDING) {
1922                                         /*
1923                                          * ESI_FLUSH_PENDING,
1924                                          * ESI_FORWARD_DIRECT
1925                                          */
1926                                         entry->vcc = tmp->vcc;
1927                                         entry->old_push = tmp->old_push;
1928                                 }
1929                                 entry->status = tmp->status;
1930                                 break;
1931                         }
1932                 }
1933         }
1934         if (remoteflag)
1935                 entry->flags |= LEC_REMOTE_FLAG;
1936         else
1937                 entry->flags &= ~LEC_REMOTE_FLAG;
1938         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1939                 entry->status = ESI_VC_PENDING;
1940                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1941         }
1942         pr_debug("After update2\n");
1943         dump_arp_table(priv);
1944 out:
1945         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1946 }
1947
1948 /*
1949  * Notifies: Vcc setup ready
1950  */
1951 static void
1952 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1953               struct atm_vcc *vcc,
1954               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1955 {
1956         unsigned long flags;
1957         struct hlist_node *node;
1958         struct lec_arp_table *entry;
1959         int i, found_entry = 0;
1960
1961         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1962         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1963         if (ioc_data->receive == 2) {
1964                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1965 #if 0
1966                 entry = lec_arp_find(priv, bus_mac);
1967                 if (!entry) {
1968                         pr_info("LEC_ARP: Multicast entry not found!\n");
1969                         goto out;
1970                 }
1971                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1972                 entry->recv_vcc = vcc;
1973                 entry->old_recv_push = old_push;
1974 #endif
1975                 entry = make_entry(priv, bus_mac);
1976                 if (entry == NULL)
1977                         goto out;
1978                 del_timer(&entry->timer);
1979                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1980                 entry->recv_vcc = vcc;
1981                 entry->old_recv_push = old_push;
1982                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1983                 goto out;
1984         } else if (ioc_data->receive == 1) {
1985                 /*
1986                  * Vcc which we don't want to make default vcc,
1987                  * attach it anyway.
1988                  */
1989                 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",
1990                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1991                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1992                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1993                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1994                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1995                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1996                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1997                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1998                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1999                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2000                 entry = make_entry(priv, bus_mac);
2001                 if (entry == NULL)
2002                         goto out;
2003                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2004                 memset(entry->mac_addr, 0, ETH_ALEN);
2005                 entry->recv_vcc = vcc;
2006                 entry->old_recv_push = old_push;
2007                 entry->status = ESI_UNKNOWN;
2008                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2009                 entry->timer.function = lec_arp_expire_vcc;
2010                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2011                 add_timer(&entry->timer);
2012                 dump_arp_table(priv);
2013                 goto out;
2014         }
2015         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",
2016                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2017                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2018                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2019                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2020                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2021                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2022                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2023                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2024                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2025                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2026         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2027                 hlist_for_each_entry(entry, node,
2028                                      &priv->lec_arp_tables[i], next) {
2029                         if (memcmp
2030                             (ioc_data->atm_addr, entry->atm_addr,
2031                              ATM_ESA_LEN) == 0) {
2032                                 pr_debug("LEC_ARP: Attaching data direct\n");
2033                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2034                                          entry->vcc ? entry->vcc->vci : 0,
2035                                          entry->recv_vcc ? entry->recv_vcc->
2036                                          vci : 0);
2037                                 found_entry = 1;
2038                                 del_timer(&entry->timer);
2039                                 entry->vcc = vcc;
2040                                 entry->old_push = old_push;
2041                                 if (entry->status == ESI_VC_PENDING) {
2042                                         if (priv->maximum_unknown_frame_count
2043                                             == 0)
2044                                                 entry->status =
2045                                                     ESI_FORWARD_DIRECT;
2046                                         else {
2047                                                 entry->timestamp = jiffies;
2048                                                 entry->status =
2049                                                     ESI_FLUSH_PENDING;
2050 #if 0
2051                                                 send_to_lecd(priv, l_flush_xmt,
2052                                                              NULL,
2053                                                              entry->atm_addr,
2054                                                              NULL);
2055 #endif
2056                                         }
2057                                 } else {
2058                                         /*
2059                                          * They were forming a connection
2060                                          * to us, and we to them. Our
2061                                          * ATM address is numerically lower
2062                                          * than theirs, so we make connection
2063                                          * we formed into default VCC (8.1.11).
2064                                          * Connection they made gets torn
2065                                          * down. This might confuse some
2066                                          * clients. Can be changed if
2067                                          * someone reports trouble...
2068                                          */
2069                                         ;
2070                                 }
2071                         }
2072                 }
2073         }
2074         if (found_entry) {
2075                 pr_debug("After vcc was added\n");
2076                 dump_arp_table(priv);
2077                 goto out;
2078         }
2079         /*
2080          * Not found, snatch address from first data packet that arrives
2081          * from this vcc
2082          */
2083         entry = make_entry(priv, bus_mac);
2084         if (!entry)
2085                 goto out;
2086         entry->vcc = vcc;
2087         entry->old_push = old_push;
2088         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2089         memset(entry->mac_addr, 0, ETH_ALEN);
2090         entry->status = ESI_UNKNOWN;
2091         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2092         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2093         entry->timer.function = lec_arp_expire_vcc;
2094         add_timer(&entry->timer);
2095         pr_debug("After vcc was added\n");
2096         dump_arp_table(priv);
2097 out:
2098         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2099 }
2100
2101 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2102 {
2103         unsigned long flags;
2104         struct hlist_node *node;
2105         struct lec_arp_table *entry;
2106         int i;
2107
2108         pr_debug("%lx\n", tran_id);
2109 restart:
2110         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2111         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2112                 hlist_for_each_entry(entry, node,
2113                                      &priv->lec_arp_tables[i], next) {
2114                         if (entry->flush_tran_id == tran_id &&
2115                             entry->status == ESI_FLUSH_PENDING) {
2116                                 struct sk_buff *skb;
2117                                 struct atm_vcc *vcc = entry->vcc;
2118
2119                                 lec_arp_hold(entry);
2120                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2121                                                        flags);
2122                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2123                                         lec_send(vcc, skb);
2124                                 entry->last_used = jiffies;
2125                                 entry->status = ESI_FORWARD_DIRECT;
2126                                 lec_arp_put(entry);
2127                                 pr_debug("LEC_ARP: Flushed\n");
2128                                 goto restart;
2129                         }
2130                 }
2131         }
2132         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2133         dump_arp_table(priv);
2134 }
2135
2136 static void
2137 lec_set_flush_tran_id(struct lec_priv *priv,
2138                       const unsigned char *atm_addr, unsigned long tran_id)
2139 {
2140         unsigned long flags;
2141         struct hlist_node *node;
2142         struct lec_arp_table *entry;
2143         int i;
2144
2145         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2146         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2147                 hlist_for_each_entry(entry, node,
2148                                      &priv->lec_arp_tables[i], next) {
2149                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2150                                 entry->flush_tran_id = tran_id;
2151                                 pr_debug("Set flush transaction id to %lx for %p\n",
2152                                          tran_id, entry);
2153                         }
2154                 }
2155         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2156 }
2157
2158 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2159 {
2160         unsigned long flags;
2161         unsigned char mac_addr[] = {
2162                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2163         };
2164         struct lec_arp_table *to_add;
2165         struct lec_vcc_priv *vpriv;
2166         int err = 0;
2167
2168         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2169         if (!vpriv)
2170                 return -ENOMEM;
2171         vpriv->xoff = 0;
2172         vpriv->old_pop = vcc->pop;
2173         vcc->user_back = vpriv;
2174         vcc->pop = lec_pop;
2175         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2176         to_add = make_entry(priv, mac_addr);
2177         if (!to_add) {
2178                 vcc->pop = vpriv->old_pop;
2179                 kfree(vpriv);
2180                 err = -ENOMEM;
2181                 goto out;
2182         }
2183         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2184         to_add->status = ESI_FORWARD_DIRECT;
2185         to_add->flags |= LEC_PERMANENT_FLAG;
2186         to_add->vcc = vcc;
2187         to_add->old_push = vcc->push;
2188         vcc->push = lec_push;
2189         priv->mcast_vcc = vcc;
2190         lec_arp_add(priv, to_add);
2191 out:
2192         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2193         return err;
2194 }
2195
2196 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2197 {
2198         unsigned long flags;
2199         struct hlist_node *node, *next;
2200         struct lec_arp_table *entry;
2201         int i;
2202
2203         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2204         dump_arp_table(priv);
2205
2206         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2207
2208         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2209                 hlist_for_each_entry_safe(entry, node, next,
2210                                           &priv->lec_arp_tables[i], next) {
2211                         if (vcc == entry->vcc) {
2212                                 lec_arp_remove(priv, entry);
2213                                 lec_arp_put(entry);
2214                                 if (priv->mcast_vcc == vcc)
2215                                         priv->mcast_vcc = NULL;
2216                         }
2217                 }
2218         }
2219
2220         hlist_for_each_entry_safe(entry, node, next,
2221                                   &priv->lec_arp_empty_ones, next) {
2222                 if (entry->vcc == vcc) {
2223                         lec_arp_clear_vccs(entry);
2224                         del_timer(&entry->timer);
2225                         hlist_del(&entry->next);
2226                         lec_arp_put(entry);
2227                 }
2228         }
2229
2230         hlist_for_each_entry_safe(entry, node, next,
2231                                   &priv->lec_no_forward, next) {
2232                 if (entry->recv_vcc == vcc) {
2233                         lec_arp_clear_vccs(entry);
2234                         del_timer(&entry->timer);
2235                         hlist_del(&entry->next);
2236                         lec_arp_put(entry);
2237                 }
2238         }
2239
2240         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2241                 if (entry->recv_vcc == vcc) {
2242                         lec_arp_clear_vccs(entry);
2243                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2244                         hlist_del(&entry->next);
2245                         lec_arp_put(entry);
2246                 }
2247         }
2248
2249         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2250         dump_arp_table(priv);
2251 }
2252
2253 static void
2254 lec_arp_check_empties(struct lec_priv *priv,
2255                       struct atm_vcc *vcc, struct sk_buff *skb)
2256 {
2257         unsigned long flags;
2258         struct hlist_node *node, *next;
2259         struct lec_arp_table *entry, *tmp;
2260         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2261         unsigned char *src = hdr->h_source;
2262
2263         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2264         hlist_for_each_entry_safe(entry, node, next,
2265                                   &priv->lec_arp_empty_ones, next) {
2266                 if (vcc == entry->vcc) {
2267                         del_timer(&entry->timer);
2268                         memcpy(entry->mac_addr, src, ETH_ALEN);
2269                         entry->status = ESI_FORWARD_DIRECT;
2270                         entry->last_used = jiffies;
2271                         /* We might have got an entry */
2272                         tmp = lec_arp_find(priv, src);
2273                         if (tmp) {
2274                                 lec_arp_remove(priv, tmp);
2275                                 lec_arp_put(tmp);
2276                         }
2277                         hlist_del(&entry->next);
2278                         lec_arp_add(priv, entry);
2279                         goto out;
2280                 }
2281         }
2282         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2283 out:
2284         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2285 }
2286
2287 MODULE_LICENSE("GPL");