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lec.c
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1 /*
2  * lec.c: Lan Emulation driver
3  *
4  * Marko Kiiskila <[email protected]>
5  */
6 
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
8 
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/bitops.h>
12 #include <linux/capability.h>
13 
14 /* We are ethernet device */
15 #include <linux/if_ether.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <net/sock.h>
19 #include <linux/skbuff.h>
20 #include <linux/ip.h>
21 #include <asm/byteorder.h>
22 #include <linux/uaccess.h>
23 #include <net/arp.h>
24 #include <net/dst.h>
25 #include <linux/proc_fs.h>
26 #include <linux/spinlock.h>
27 #include <linux/seq_file.h>
28 
29 /* And atm device */
30 #include <linux/atmdev.h>
31 #include <linux/atmlec.h>
32 
33 /* Proxy LEC knows about bridging */
34 #if 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  if (unlikely(!skb2)) {
235  kfree_skb(skb);
236  return NETDEV_TX_OK;
237  }
238  consume_skb(skb);
239  skb = skb2;
240  }
241  skb_push(skb, 2);
242 
243  /* Put le header to place */
244  lec_h = (struct lecdatahdr_8023 *)skb->data;
245  lec_h->le_header = htons(priv->lecid);
246 
247 #if DUMP_PACKETS >= 2
248 #define MAX_DUMP_SKB 99
249 #elif DUMP_PACKETS >= 1
250 #define MAX_DUMP_SKB 30
251 #endif
252 #if DUMP_PACKETS >= 1
253  printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
254  dev->name, skb->len, priv->lecid);
255  print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
256  skb->data, min(skb->len, MAX_DUMP_SKB), true);
257 #endif /* DUMP_PACKETS >= 1 */
258 
259  /* Minimum ethernet-frame size */
260  min_frame_size = LEC_MINIMUM_8023_SIZE;
261  if (skb->len < min_frame_size) {
262  if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
263  skb2 = skb_copy_expand(skb, 0,
264  min_frame_size - skb->truesize,
265  GFP_ATOMIC);
266  dev_kfree_skb(skb);
267  if (skb2 == NULL) {
268  dev->stats.tx_dropped++;
269  return NETDEV_TX_OK;
270  }
271  skb = skb2;
272  }
273  skb_put(skb, min_frame_size - skb->len);
274  }
275 
276  /* Send to right vcc */
277  is_rdesc = 0;
278  dst = lec_h->h_dest;
279  entry = NULL;
280  vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
281  pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
282  dev->name, vcc, vcc ? vcc->flags : 0, entry);
283  if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
284  if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
285  pr_debug("%s:queuing packet, MAC address %pM\n",
286  dev->name, lec_h->h_dest);
287  skb_queue_tail(&entry->tx_wait, skb);
288  } else {
289  pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
290  dev->name, lec_h->h_dest);
291  dev->stats.tx_dropped++;
292  dev_kfree_skb(skb);
293  }
294  goto out;
295  }
296 #if DUMP_PACKETS > 0
297  printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
298  dev->name, vcc->vpi, vcc->vci);
299 #endif /* DUMP_PACKETS > 0 */
300 
301  while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
302  pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
303  lec_send(vcc, skb2);
304  }
305 
306  lec_send(vcc, skb);
307 
308  if (!atm_may_send(vcc, 0)) {
309  struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
310 
311  vpriv->xoff = 1;
312  netif_stop_queue(dev);
313 
314  /*
315  * vcc->pop() might have occurred in between, making
316  * the vcc usuable again. Since xmit is serialized,
317  * this is the only situation we have to re-test.
318  */
319 
320  if (atm_may_send(vcc, 0))
321  netif_wake_queue(dev);
322  }
323 
324 out:
325  if (entry)
326  lec_arp_put(entry);
327  dev->trans_start = jiffies;
328  return NETDEV_TX_OK;
329 }
330 
331 /* The inverse routine to net_open(). */
332 static int lec_close(struct net_device *dev)
333 {
334  netif_stop_queue(dev);
335  return 0;
336 }
337 
338 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
339 {
340  unsigned long flags;
341  struct net_device *dev = (struct net_device *)vcc->proto_data;
342  struct lec_priv *priv = netdev_priv(dev);
343  struct atmlec_msg *mesg;
344  struct lec_arp_table *entry;
345  int i;
346  char *tmp; /* FIXME */
347 
348  atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
349  mesg = (struct atmlec_msg *)skb->data;
350  tmp = skb->data;
351  tmp += sizeof(struct atmlec_msg);
352  pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
353  switch (mesg->type) {
354  case l_set_mac_addr:
355  for (i = 0; i < 6; i++)
356  dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
357  break;
358  case l_del_mac_addr:
359  for (i = 0; i < 6; i++)
360  dev->dev_addr[i] = 0;
361  break;
362  case l_addr_delete:
363  lec_addr_delete(priv, mesg->content.normal.atm_addr,
364  mesg->content.normal.flag);
365  break;
366  case l_topology_change:
367  priv->topology_change = mesg->content.normal.flag;
368  break;
369  case l_flush_complete:
370  lec_flush_complete(priv, mesg->content.normal.flag);
371  break;
372  case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
373  spin_lock_irqsave(&priv->lec_arp_lock, flags);
374  entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
375  lec_arp_remove(priv, entry);
376  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
377 
378  if (mesg->content.normal.no_source_le_narp)
379  break;
380  /* FALL THROUGH */
381  case l_arp_update:
382  lec_arp_update(priv, mesg->content.normal.mac_addr,
383  mesg->content.normal.atm_addr,
384  mesg->content.normal.flag,
385  mesg->content.normal.targetless_le_arp);
386  pr_debug("in l_arp_update\n");
387  if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
388  pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
389  mesg->sizeoftlvs);
390  lane2_associate_ind(dev, mesg->content.normal.mac_addr,
391  tmp, mesg->sizeoftlvs);
392  }
393  break;
394  case l_config:
395  priv->maximum_unknown_frame_count =
396  mesg->content.config.maximum_unknown_frame_count;
397  priv->max_unknown_frame_time =
398  (mesg->content.config.max_unknown_frame_time * HZ);
399  priv->max_retry_count = mesg->content.config.max_retry_count;
400  priv->aging_time = (mesg->content.config.aging_time * HZ);
401  priv->forward_delay_time =
402  (mesg->content.config.forward_delay_time * HZ);
403  priv->arp_response_time =
404  (mesg->content.config.arp_response_time * HZ);
405  priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
406  priv->path_switching_delay =
407  (mesg->content.config.path_switching_delay * HZ);
408  priv->lane_version = mesg->content.config.lane_version;
409  /* LANE2 */
410  priv->lane2_ops = NULL;
411  if (priv->lane_version > 1)
412  priv->lane2_ops = &lane2_ops;
413  if (dev_set_mtu(dev, mesg->content.config.mtu))
414  pr_info("%s: change_mtu to %d failed\n",
415  dev->name, mesg->content.config.mtu);
416  priv->is_proxy = mesg->content.config.is_proxy;
417  break;
418  case l_flush_tran_id:
419  lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
420  mesg->content.normal.flag);
421  break;
422  case l_set_lecid:
423  priv->lecid =
424  (unsigned short)(0xffff & mesg->content.normal.flag);
425  break;
426  case l_should_bridge:
427 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
428  {
429  pr_debug("%s: bridge zeppelin asks about %pM\n",
430  dev->name, mesg->content.proxy.mac_addr);
431 
432  if (br_fdb_test_addr_hook == NULL)
433  break;
434 
435  if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
436  /* hit from bridge table, send LE_ARP_RESPONSE */
437  struct sk_buff *skb2;
438  struct sock *sk;
439 
440  pr_debug("%s: entry found, responding to zeppelin\n",
441  dev->name);
442  skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
443  if (skb2 == NULL)
444  break;
445  skb2->len = sizeof(struct atmlec_msg);
446  skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
447  atm_force_charge(priv->lecd, skb2->truesize);
448  sk = sk_atm(priv->lecd);
449  skb_queue_tail(&sk->sk_receive_queue, skb2);
450  sk->sk_data_ready(sk, skb2->len);
451  }
452  }
453 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
454  break;
455  default:
456  pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
457  dev_kfree_skb(skb);
458  return -EINVAL;
459  }
460  dev_kfree_skb(skb);
461  return 0;
462 }
463 
464 static void lec_atm_close(struct atm_vcc *vcc)
465 {
466  struct sk_buff *skb;
467  struct net_device *dev = (struct net_device *)vcc->proto_data;
468  struct lec_priv *priv = netdev_priv(dev);
469 
470  priv->lecd = NULL;
471  /* Do something needful? */
472 
473  netif_stop_queue(dev);
474  lec_arp_destroy(priv);
475 
476  if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
477  pr_info("%s closing with messages pending\n", dev->name);
478  while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
479  atm_return(vcc, skb->truesize);
480  dev_kfree_skb(skb);
481  }
482 
483  pr_info("%s: Shut down!\n", dev->name);
484  module_put(THIS_MODULE);
485 }
486 
487 static struct atmdev_ops lecdev_ops = {
488  .close = lec_atm_close,
489  .send = lec_atm_send
490 };
491 
492 static struct atm_dev lecatm_dev = {
493  .ops = &lecdev_ops,
494  .type = "lec",
495  .number = 999, /* dummy device number */
496  .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
497 };
498 
499 /*
500  * LANE2: new argument struct sk_buff *data contains
501  * the LE_ARP based TLVs introduced in the LANE2 spec
502  */
503 static int
504 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
505  const unsigned char *mac_addr, const unsigned char *atm_addr,
506  struct sk_buff *data)
507 {
508  struct sock *sk;
509  struct sk_buff *skb;
510  struct atmlec_msg *mesg;
511 
512  if (!priv || !priv->lecd)
513  return -1;
514  skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
515  if (!skb)
516  return -1;
517  skb->len = sizeof(struct atmlec_msg);
518  mesg = (struct atmlec_msg *)skb->data;
519  memset(mesg, 0, sizeof(struct atmlec_msg));
520  mesg->type = type;
521  if (data != NULL)
522  mesg->sizeoftlvs = data->len;
523  if (mac_addr)
524  memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
525  else
526  mesg->content.normal.targetless_le_arp = 1;
527  if (atm_addr)
528  memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
529 
530  atm_force_charge(priv->lecd, skb->truesize);
531  sk = sk_atm(priv->lecd);
532  skb_queue_tail(&sk->sk_receive_queue, skb);
533  sk->sk_data_ready(sk, skb->len);
534 
535  if (data != NULL) {
536  pr_debug("about to send %d bytes of data\n", data->len);
537  atm_force_charge(priv->lecd, data->truesize);
538  skb_queue_tail(&sk->sk_receive_queue, data);
539  sk->sk_data_ready(sk, skb->len);
540  }
541 
542  return 0;
543 }
544 
545 /* shamelessly stolen from drivers/net/net_init.c */
546 static int lec_change_mtu(struct net_device *dev, int new_mtu)
547 {
548  if ((new_mtu < 68) || (new_mtu > 18190))
549  return -EINVAL;
550  dev->mtu = new_mtu;
551  return 0;
552 }
553 
554 static void lec_set_multicast_list(struct net_device *dev)
555 {
556  /*
557  * by default, all multicast frames arrive over the bus.
558  * eventually support selective multicast service
559  */
560 }
561 
562 static const struct net_device_ops lec_netdev_ops = {
563  .ndo_open = lec_open,
564  .ndo_stop = lec_close,
565  .ndo_start_xmit = lec_start_xmit,
566  .ndo_change_mtu = lec_change_mtu,
567  .ndo_tx_timeout = lec_tx_timeout,
568  .ndo_set_rx_mode = lec_set_multicast_list,
569 };
570 
571 static const unsigned char lec_ctrl_magic[] = {
572  0xff,
573  0x00,
574  0x01,
575  0x01
576 };
577 
578 #define LEC_DATA_DIRECT_8023 2
579 #define LEC_DATA_DIRECT_8025 3
580 
581 static int lec_is_data_direct(struct atm_vcc *vcc)
582 {
583  return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
584  (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
585 }
586 
587 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
588 {
589  unsigned long flags;
590  struct net_device *dev = (struct net_device *)vcc->proto_data;
591  struct lec_priv *priv = netdev_priv(dev);
592 
593 #if DUMP_PACKETS > 0
594  printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
595  dev->name, vcc->vpi, vcc->vci);
596 #endif
597  if (!skb) {
598  pr_debug("%s: null skb\n", dev->name);
599  lec_vcc_close(priv, vcc);
600  return;
601  }
602 #if DUMP_PACKETS >= 2
603 #define MAX_SKB_DUMP 99
604 #elif DUMP_PACKETS >= 1
605 #define MAX_SKB_DUMP 30
606 #endif
607 #if DUMP_PACKETS > 0
608  printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
609  dev->name, skb->len, priv->lecid);
610  print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
611  skb->data, min(MAX_SKB_DUMP, skb->len), true);
612 #endif /* DUMP_PACKETS > 0 */
613  if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
614  /* Control frame, to daemon */
615  struct sock *sk = sk_atm(vcc);
616 
617  pr_debug("%s: To daemon\n", dev->name);
618  skb_queue_tail(&sk->sk_receive_queue, skb);
619  sk->sk_data_ready(sk, skb->len);
620  } else { /* Data frame, queue to protocol handlers */
621  struct lec_arp_table *entry;
622  unsigned char *src, *dst;
623 
624  atm_return(vcc, skb->truesize);
625  if (*(__be16 *) skb->data == htons(priv->lecid) ||
626  !priv->lecd || !(dev->flags & IFF_UP)) {
627  /*
628  * Probably looping back, or if lecd is missing,
629  * lecd has gone down
630  */
631  pr_debug("Ignoring frame...\n");
632  dev_kfree_skb(skb);
633  return;
634  }
635  dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
636 
637  /*
638  * If this is a Data Direct VCC, and the VCC does not match
639  * the LE_ARP cache entry, delete the LE_ARP cache entry.
640  */
641  spin_lock_irqsave(&priv->lec_arp_lock, flags);
642  if (lec_is_data_direct(vcc)) {
643  src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
644  entry = lec_arp_find(priv, src);
645  if (entry && entry->vcc != vcc) {
646  lec_arp_remove(priv, entry);
647  lec_arp_put(entry);
648  }
649  }
650  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
651 
652  if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
653  !priv->is_proxy && /* Proxy wants all the packets */
654  memcmp(dst, dev->dev_addr, dev->addr_len)) {
655  dev_kfree_skb(skb);
656  return;
657  }
658  if (!hlist_empty(&priv->lec_arp_empty_ones))
659  lec_arp_check_empties(priv, vcc, skb);
660  skb_pull(skb, 2); /* skip lec_id */
661  skb->protocol = eth_type_trans(skb, dev);
662  dev->stats.rx_packets++;
663  dev->stats.rx_bytes += skb->len;
664  memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
665  netif_rx(skb);
666  }
667 }
668 
669 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
670 {
671  struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
672  struct net_device *dev = skb->dev;
673 
674  if (vpriv == NULL) {
675  pr_info("vpriv = NULL!?!?!?\n");
676  return;
677  }
678 
679  vpriv->old_pop(vcc, skb);
680 
681  if (vpriv->xoff && atm_may_send(vcc, 0)) {
682  vpriv->xoff = 0;
683  if (netif_running(dev) && netif_queue_stopped(dev))
684  netif_wake_queue(dev);
685  }
686 }
687 
688 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
689 {
690  struct lec_vcc_priv *vpriv;
691  int bytes_left;
692  struct atmlec_ioc ioc_data;
693 
694  /* Lecd must be up in this case */
695  bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
696  if (bytes_left != 0)
697  pr_info("copy from user failed for %d bytes\n", bytes_left);
698  if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
699  !dev_lec[ioc_data.dev_num])
700  return -EINVAL;
701  vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
702  if (!vpriv)
703  return -ENOMEM;
704  vpriv->xoff = 0;
705  vpriv->old_pop = vcc->pop;
706  vcc->user_back = vpriv;
707  vcc->pop = lec_pop;
708  lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
709  &ioc_data, vcc, vcc->push);
710  vcc->proto_data = dev_lec[ioc_data.dev_num];
711  vcc->push = lec_push;
712  return 0;
713 }
714 
715 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
716 {
717  if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
718  return -EINVAL;
719  vcc->proto_data = dev_lec[arg];
720  return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
721 }
722 
723 /* Initialize device. */
724 static int lecd_attach(struct atm_vcc *vcc, int arg)
725 {
726  int i;
727  struct lec_priv *priv;
728 
729  if (arg < 0)
730  i = 0;
731  else
732  i = arg;
733  if (arg >= MAX_LEC_ITF)
734  return -EINVAL;
735  if (!dev_lec[i]) {
736  int size;
737 
738  size = sizeof(struct lec_priv);
739  dev_lec[i] = alloc_etherdev(size);
740  if (!dev_lec[i])
741  return -ENOMEM;
742  dev_lec[i]->netdev_ops = &lec_netdev_ops;
743  snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
744  if (register_netdev(dev_lec[i])) {
745  free_netdev(dev_lec[i]);
746  return -EINVAL;
747  }
748 
749  priv = netdev_priv(dev_lec[i]);
750  } else {
751  priv = netdev_priv(dev_lec[i]);
752  if (priv->lecd)
753  return -EADDRINUSE;
754  }
755  lec_arp_init(priv);
756  priv->itfnum = i; /* LANE2 addition */
757  priv->lecd = vcc;
758  vcc->dev = &lecatm_dev;
759  vcc_insert_socket(sk_atm(vcc));
760 
761  vcc->proto_data = dev_lec[i];
762  set_bit(ATM_VF_META, &vcc->flags);
763  set_bit(ATM_VF_READY, &vcc->flags);
764 
765  /* Set default values to these variables */
766  priv->maximum_unknown_frame_count = 1;
767  priv->max_unknown_frame_time = (1 * HZ);
768  priv->vcc_timeout_period = (1200 * HZ);
769  priv->max_retry_count = 1;
770  priv->aging_time = (300 * HZ);
771  priv->forward_delay_time = (15 * HZ);
772  priv->topology_change = 0;
773  priv->arp_response_time = (1 * HZ);
774  priv->flush_timeout = (4 * HZ);
775  priv->path_switching_delay = (6 * HZ);
776 
777  if (dev_lec[i]->flags & IFF_UP)
778  netif_start_queue(dev_lec[i]);
779  __module_get(THIS_MODULE);
780  return i;
781 }
782 
783 #ifdef CONFIG_PROC_FS
784 static const char *lec_arp_get_status_string(unsigned char status)
785 {
786  static const char *const lec_arp_status_string[] = {
787  "ESI_UNKNOWN ",
788  "ESI_ARP_PENDING ",
789  "ESI_VC_PENDING ",
790  "<Undefined> ",
791  "ESI_FLUSH_PENDING ",
792  "ESI_FORWARD_DIRECT"
793  };
794 
795  if (status > ESI_FORWARD_DIRECT)
796  status = 3; /* ESI_UNDEFINED */
797  return lec_arp_status_string[status];
798 }
799 
800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
801 {
802  int i;
803 
804  for (i = 0; i < ETH_ALEN; i++)
805  seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
806  seq_printf(seq, " ");
807  for (i = 0; i < ATM_ESA_LEN; i++)
808  seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
809  seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
810  entry->flags & 0xffff);
811  if (entry->vcc)
812  seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
813  else
814  seq_printf(seq, " ");
815  if (entry->recv_vcc) {
816  seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
817  entry->recv_vcc->vci);
818  }
819  seq_putc(seq, '\n');
820 }
821 
822 struct lec_state {
823  unsigned long flags;
824  struct lec_priv *locked;
825  struct hlist_node *node;
826  struct net_device *dev;
827  int itf;
828  int arp_table;
829  int misc_table;
830 };
831 
832 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
833  loff_t *l)
834 {
835  struct hlist_node *e = state->node;
836  struct lec_arp_table *tmp;
837 
838  if (!e)
839  e = tbl->first;
840  if (e == SEQ_START_TOKEN) {
841  e = tbl->first;
842  --*l;
843  }
844 
845  hlist_for_each_entry_from(tmp, e, next) {
846  if (--*l < 0)
847  break;
848  }
849  state->node = e;
850 
851  return (*l < 0) ? state : NULL;
852 }
853 
854 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
855  struct lec_priv *priv)
856 {
857  void *v = NULL;
858  int p;
859 
860  for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
861  v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
862  if (v)
863  break;
864  }
865  state->arp_table = p;
866  return v;
867 }
868 
869 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
870  struct lec_priv *priv)
871 {
872  struct hlist_head *lec_misc_tables[] = {
873  &priv->lec_arp_empty_ones,
874  &priv->lec_no_forward,
875  &priv->mcast_fwds
876  };
877  void *v = NULL;
878  int q;
879 
880  for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
881  v = lec_tbl_walk(state, lec_misc_tables[q], l);
882  if (v)
883  break;
884  }
885  state->misc_table = q;
886  return v;
887 }
888 
889 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
890  struct lec_priv *priv)
891 {
892  if (!state->locked) {
893  state->locked = priv;
894  spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
895  }
896  if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
897  spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
898  state->locked = NULL;
899  /* Partial state reset for the next time we get called */
900  state->arp_table = state->misc_table = 0;
901  }
902  return state->locked;
903 }
904 
905 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
906 {
907  struct net_device *dev;
908  void *v;
909 
910  dev = state->dev ? state->dev : dev_lec[state->itf];
911  v = (dev && netdev_priv(dev)) ?
912  lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
913  if (!v && dev) {
914  dev_put(dev);
915  /* Partial state reset for the next time we get called */
916  dev = NULL;
917  }
918  state->dev = dev;
919  return v;
920 }
921 
922 static void *lec_get_idx(struct lec_state *state, loff_t l)
923 {
924  void *v = NULL;
925 
926  for (; state->itf < MAX_LEC_ITF; state->itf++) {
927  v = lec_itf_walk(state, &l);
928  if (v)
929  break;
930  }
931  return v;
932 }
933 
934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
935 {
936  struct lec_state *state = seq->private;
937 
938  state->itf = 0;
939  state->dev = NULL;
940  state->locked = NULL;
941  state->arp_table = 0;
942  state->misc_table = 0;
943  state->node = SEQ_START_TOKEN;
944 
945  return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
946 }
947 
948 static void lec_seq_stop(struct seq_file *seq, void *v)
949 {
950  struct lec_state *state = seq->private;
951 
952  if (state->dev) {
953  spin_unlock_irqrestore(&state->locked->lec_arp_lock,
954  state->flags);
955  dev_put(state->dev);
956  }
957 }
958 
959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
960 {
961  struct lec_state *state = seq->private;
962 
963  v = lec_get_idx(state, 1);
964  *pos += !!PTR_ERR(v);
965  return v;
966 }
967 
968 static int lec_seq_show(struct seq_file *seq, void *v)
969 {
970  static const char lec_banner[] =
971  "Itf MAC ATM destination"
972  " Status Flags "
973  "VPI/VCI Recv VPI/VCI\n";
974 
975  if (v == SEQ_START_TOKEN)
976  seq_puts(seq, lec_banner);
977  else {
978  struct lec_state *state = seq->private;
979  struct net_device *dev = state->dev;
980  struct lec_arp_table *entry = hlist_entry(state->node,
981  struct lec_arp_table,
982  next);
983 
984  seq_printf(seq, "%s ", dev->name);
985  lec_info(seq, entry);
986  }
987  return 0;
988 }
989 
990 static const struct seq_operations lec_seq_ops = {
991  .start = lec_seq_start,
992  .next = lec_seq_next,
993  .stop = lec_seq_stop,
994  .show = lec_seq_show,
995 };
996 
997 static int lec_seq_open(struct inode *inode, struct file *file)
998 {
999  return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1000 }
1001 
1002 static const struct file_operations lec_seq_fops = {
1003  .owner = THIS_MODULE,
1004  .open = lec_seq_open,
1005  .read = seq_read,
1006  .llseek = seq_lseek,
1007  .release = seq_release_private,
1008 };
1009 #endif
1010 
1011 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1012 {
1013  struct atm_vcc *vcc = ATM_SD(sock);
1014  int err = 0;
1015 
1016  switch (cmd) {
1017  case ATMLEC_CTRL:
1018  case ATMLEC_MCAST:
1019  case ATMLEC_DATA:
1020  if (!capable(CAP_NET_ADMIN))
1021  return -EPERM;
1022  break;
1023  default:
1024  return -ENOIOCTLCMD;
1025  }
1026 
1027  switch (cmd) {
1028  case ATMLEC_CTRL:
1029  err = lecd_attach(vcc, (int)arg);
1030  if (err >= 0)
1031  sock->state = SS_CONNECTED;
1032  break;
1033  case ATMLEC_MCAST:
1034  err = lec_mcast_attach(vcc, (int)arg);
1035  break;
1036  case ATMLEC_DATA:
1037  err = lec_vcc_attach(vcc, (void __user *)arg);
1038  break;
1039  }
1040 
1041  return err;
1042 }
1043 
1044 static struct atm_ioctl lane_ioctl_ops = {
1045  .owner = THIS_MODULE,
1046  .ioctl = lane_ioctl,
1047 };
1048 
1049 static int __init lane_module_init(void)
1050 {
1051 #ifdef CONFIG_PROC_FS
1052  struct proc_dir_entry *p;
1053 
1054  p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1055  if (!p) {
1056  pr_err("Unable to initialize /proc/net/atm/lec\n");
1057  return -ENOMEM;
1058  }
1059 #endif
1060 
1061  register_atm_ioctl(&lane_ioctl_ops);
1062  pr_info("lec.c: initialized\n");
1063  return 0;
1064 }
1065 
1066 static void __exit lane_module_cleanup(void)
1067 {
1068  int i;
1069 
1070  remove_proc_entry("lec", atm_proc_root);
1071 
1072  deregister_atm_ioctl(&lane_ioctl_ops);
1073 
1074  for (i = 0; i < MAX_LEC_ITF; i++) {
1075  if (dev_lec[i] != NULL) {
1076  unregister_netdev(dev_lec[i]);
1077  free_netdev(dev_lec[i]);
1078  dev_lec[i] = NULL;
1079  }
1080  }
1081 }
1082 
1083 module_init(lane_module_init);
1084 module_exit(lane_module_cleanup);
1085 
1086 /*
1087  * LANE2: 3.1.3, LE_RESOLVE.request
1088  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1089  * If sizeoftlvs == NULL the default TLVs associated with with this
1090  * lec will be used.
1091  * If dst_mac == NULL, targetless LE_ARP will be sent
1092  */
1093 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1094  u8 **tlvs, u32 *sizeoftlvs)
1095 {
1096  unsigned long flags;
1097  struct lec_priv *priv = netdev_priv(dev);
1098  struct lec_arp_table *table;
1099  struct sk_buff *skb;
1100  int retval;
1101 
1102  if (force == 0) {
1103  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1104  table = lec_arp_find(priv, dst_mac);
1105  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1106  if (table == NULL)
1107  return -1;
1108 
1109  *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1110  if (*tlvs == NULL)
1111  return -1;
1112 
1113  *sizeoftlvs = table->sizeoftlvs;
1114 
1115  return 0;
1116  }
1117 
1118  if (sizeoftlvs == NULL)
1119  retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1120 
1121  else {
1122  skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1123  if (skb == NULL)
1124  return -1;
1125  skb->len = *sizeoftlvs;
1126  skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1127  retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1128  }
1129  return retval;
1130 }
1131 
1132 /*
1133  * LANE2: 3.1.4, LE_ASSOCIATE.request
1134  * Associate the *tlvs with the *lan_dst address.
1135  * Will overwrite any previous association
1136  * Returns 1 for success, 0 for failure (out of memory)
1137  *
1138  */
1139 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1140  const u8 *tlvs, u32 sizeoftlvs)
1141 {
1142  int retval;
1143  struct sk_buff *skb;
1144  struct lec_priv *priv = netdev_priv(dev);
1145 
1146  if (!ether_addr_equal(lan_dst, dev->dev_addr))
1147  return 0; /* not our mac address */
1148 
1149  kfree(priv->tlvs); /* NULL if there was no previous association */
1150 
1151  priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1152  if (priv->tlvs == NULL)
1153  return 0;
1154  priv->sizeoftlvs = sizeoftlvs;
1155 
1156  skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1157  if (skb == NULL)
1158  return 0;
1159  skb->len = sizeoftlvs;
1160  skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1161  retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1162  if (retval != 0)
1163  pr_info("lec.c: lane2_associate_req() failed\n");
1164  /*
1165  * If the previous association has changed we must
1166  * somehow notify other LANE entities about the change
1167  */
1168  return 1;
1169 }
1170 
1171 /*
1172  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1173  *
1174  */
1175 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1176  const u8 *tlvs, u32 sizeoftlvs)
1177 {
1178 #if 0
1179  int i = 0;
1180 #endif
1181  struct lec_priv *priv = netdev_priv(dev);
1182 #if 0 /*
1183  * Why have the TLVs in LE_ARP entries
1184  * since we do not use them? When you
1185  * uncomment this code, make sure the
1186  * TLVs get freed when entry is killed
1187  */
1188  struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1189 
1190  if (entry == NULL)
1191  return; /* should not happen */
1192 
1193  kfree(entry->tlvs);
1194 
1195  entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1196  if (entry->tlvs == NULL)
1197  return;
1198  entry->sizeoftlvs = sizeoftlvs;
1199 #endif
1200 #if 0
1201  pr_info("\n");
1202  pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1203  while (i < sizeoftlvs)
1204  pr_cont("%02x ", tlvs[i++]);
1205 
1206  pr_cont("\n");
1207 #endif
1208 
1209  /* tell MPOA about the TLVs we saw */
1210  if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1211  priv->lane2_ops->associate_indicator(dev, mac_addr,
1212  tlvs, sizeoftlvs);
1213  }
1214 }
1215 
1216 /*
1217  * Here starts what used to lec_arpc.c
1218  *
1219  * lec_arpc.c was added here when making
1220  * lane client modular. October 1997
1221  */
1222 
1223 #include <linux/types.h>
1224 #include <linux/timer.h>
1225 #include <linux/param.h>
1226 #include <linux/atomic.h>
1227 #include <linux/inetdevice.h>
1228 #include <net/route.h>
1229 
1230 #if 0
1231 #define pr_debug(format, args...)
1232 /*
1233  #define pr_debug printk
1234 */
1235 #endif
1236 #define DEBUG_ARP_TABLE 0
1237 
1238 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1239 
1240 static void lec_arp_check_expire(struct work_struct *work);
1241 static void lec_arp_expire_arp(unsigned long data);
1242 
1243 /*
1244  * Arp table funcs
1245  */
1246 
1247 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1248 
1249 /*
1250  * Initialization of arp-cache
1251  */
1252 static void lec_arp_init(struct lec_priv *priv)
1253 {
1254  unsigned short i;
1255 
1256  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1257  INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1258  INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1259  INIT_HLIST_HEAD(&priv->lec_no_forward);
1260  INIT_HLIST_HEAD(&priv->mcast_fwds);
1261  spin_lock_init(&priv->lec_arp_lock);
1262  INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1263  schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1264 }
1265 
1266 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1267 {
1268  if (entry->vcc) {
1269  struct atm_vcc *vcc = entry->vcc;
1270  struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1271  struct net_device *dev = (struct net_device *)vcc->proto_data;
1272 
1273  vcc->pop = vpriv->old_pop;
1274  if (vpriv->xoff)
1275  netif_wake_queue(dev);
1276  kfree(vpriv);
1277  vcc->user_back = NULL;
1278  vcc->push = entry->old_push;
1279  vcc_release_async(vcc, -EPIPE);
1280  entry->vcc = NULL;
1281  }
1282  if (entry->recv_vcc) {
1283  entry->recv_vcc->push = entry->old_recv_push;
1284  vcc_release_async(entry->recv_vcc, -EPIPE);
1285  entry->recv_vcc = NULL;
1286  }
1287 }
1288 
1289 /*
1290  * Insert entry to lec_arp_table
1291  * LANE2: Add to the end of the list to satisfy 8.1.13
1292  */
1293 static inline void
1294 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1295 {
1296  struct hlist_head *tmp;
1297 
1298  tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1299  hlist_add_head(&entry->next, tmp);
1300 
1301  pr_debug("Added entry:%pM\n", entry->mac_addr);
1302 }
1303 
1304 /*
1305  * Remove entry from lec_arp_table
1306  */
1307 static int
1308 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1309 {
1310  struct hlist_node *node;
1311  struct lec_arp_table *entry;
1312  int i, remove_vcc = 1;
1313 
1314  if (!to_remove)
1315  return -1;
1316 
1317  hlist_del(&to_remove->next);
1318  del_timer(&to_remove->timer);
1319 
1320  /*
1321  * If this is the only MAC connected to this VCC,
1322  * also tear down the VCC
1323  */
1324  if (to_remove->status >= ESI_FLUSH_PENDING) {
1325  /*
1326  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1327  */
1328  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1329  hlist_for_each_entry(entry, node,
1330  &priv->lec_arp_tables[i], next) {
1331  if (memcmp(to_remove->atm_addr,
1332  entry->atm_addr, ATM_ESA_LEN) == 0) {
1333  remove_vcc = 0;
1334  break;
1335  }
1336  }
1337  }
1338  if (remove_vcc)
1339  lec_arp_clear_vccs(to_remove);
1340  }
1341  skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1342 
1343  pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1344  return 0;
1345 }
1346 
1347 #if DEBUG_ARP_TABLE
1348 static const char *get_status_string(unsigned char st)
1349 {
1350  switch (st) {
1351  case ESI_UNKNOWN:
1352  return "ESI_UNKNOWN";
1353  case ESI_ARP_PENDING:
1354  return "ESI_ARP_PENDING";
1355  case ESI_VC_PENDING:
1356  return "ESI_VC_PENDING";
1357  case ESI_FLUSH_PENDING:
1358  return "ESI_FLUSH_PENDING";
1359  case ESI_FORWARD_DIRECT:
1360  return "ESI_FORWARD_DIRECT";
1361  }
1362  return "<UNKNOWN>";
1363 }
1364 
1365 static void dump_arp_table(struct lec_priv *priv)
1366 {
1367  struct hlist_node *node;
1368  struct lec_arp_table *rulla;
1369  char buf[256];
1370  int i, j, offset;
1371 
1372  pr_info("Dump %p:\n", priv);
1373  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1374  hlist_for_each_entry(rulla, node,
1375  &priv->lec_arp_tables[i], next) {
1376  offset = 0;
1377  offset += sprintf(buf, "%d: %p\n", i, rulla);
1378  offset += sprintf(buf + offset, "Mac: %pM",
1379  rulla->mac_addr);
1380  offset += sprintf(buf + offset, " Atm:");
1381  for (j = 0; j < ATM_ESA_LEN; j++) {
1382  offset += sprintf(buf + offset,
1383  "%2.2x ",
1384  rulla->atm_addr[j] & 0xff);
1385  }
1386  offset += sprintf(buf + offset,
1387  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1388  rulla->vcc ? rulla->vcc->vpi : 0,
1389  rulla->vcc ? rulla->vcc->vci : 0,
1390  rulla->recv_vcc ? rulla->recv_vcc->
1391  vpi : 0,
1392  rulla->recv_vcc ? rulla->recv_vcc->
1393  vci : 0, rulla->last_used,
1394  rulla->timestamp, rulla->no_tries);
1395  offset +=
1396  sprintf(buf + offset,
1397  "Flags:%x, Packets_flooded:%x, Status: %s ",
1398  rulla->flags, rulla->packets_flooded,
1399  get_status_string(rulla->status));
1400  pr_info("%s\n", buf);
1401  }
1402  }
1403 
1404  if (!hlist_empty(&priv->lec_no_forward))
1405  pr_info("No forward\n");
1406  hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1407  offset = 0;
1408  offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1409  offset += sprintf(buf + offset, " Atm:");
1410  for (j = 0; j < ATM_ESA_LEN; j++) {
1411  offset += sprintf(buf + offset, "%2.2x ",
1412  rulla->atm_addr[j] & 0xff);
1413  }
1414  offset += sprintf(buf + offset,
1415  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1416  rulla->vcc ? rulla->vcc->vpi : 0,
1417  rulla->vcc ? rulla->vcc->vci : 0,
1418  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1419  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1420  rulla->last_used,
1421  rulla->timestamp, rulla->no_tries);
1422  offset += sprintf(buf + offset,
1423  "Flags:%x, Packets_flooded:%x, Status: %s ",
1424  rulla->flags, rulla->packets_flooded,
1425  get_status_string(rulla->status));
1426  pr_info("%s\n", buf);
1427  }
1428 
1429  if (!hlist_empty(&priv->lec_arp_empty_ones))
1430  pr_info("Empty ones\n");
1431  hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1432  offset = 0;
1433  offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1434  offset += sprintf(buf + offset, " Atm:");
1435  for (j = 0; j < ATM_ESA_LEN; j++) {
1436  offset += sprintf(buf + offset, "%2.2x ",
1437  rulla->atm_addr[j] & 0xff);
1438  }
1439  offset += sprintf(buf + offset,
1440  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1441  rulla->vcc ? rulla->vcc->vpi : 0,
1442  rulla->vcc ? rulla->vcc->vci : 0,
1443  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1444  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1445  rulla->last_used,
1446  rulla->timestamp, rulla->no_tries);
1447  offset += sprintf(buf + offset,
1448  "Flags:%x, Packets_flooded:%x, Status: %s ",
1449  rulla->flags, rulla->packets_flooded,
1450  get_status_string(rulla->status));
1451  pr_info("%s", buf);
1452  }
1453 
1454  if (!hlist_empty(&priv->mcast_fwds))
1455  pr_info("Multicast Forward VCCs\n");
1456  hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1457  offset = 0;
1458  offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1459  offset += sprintf(buf + offset, " Atm:");
1460  for (j = 0; j < ATM_ESA_LEN; j++) {
1461  offset += sprintf(buf + offset, "%2.2x ",
1462  rulla->atm_addr[j] & 0xff);
1463  }
1464  offset += sprintf(buf + offset,
1465  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1466  rulla->vcc ? rulla->vcc->vpi : 0,
1467  rulla->vcc ? rulla->vcc->vci : 0,
1468  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1469  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1470  rulla->last_used,
1471  rulla->timestamp, rulla->no_tries);
1472  offset += sprintf(buf + offset,
1473  "Flags:%x, Packets_flooded:%x, Status: %s ",
1474  rulla->flags, rulla->packets_flooded,
1475  get_status_string(rulla->status));
1476  pr_info("%s\n", buf);
1477  }
1478 
1479 }
1480 #else
1481 #define dump_arp_table(priv) do { } while (0)
1482 #endif
1483 
1484 /*
1485  * Destruction of arp-cache
1486  */
1487 static void lec_arp_destroy(struct lec_priv *priv)
1488 {
1489  unsigned long flags;
1490  struct hlist_node *node, *next;
1491  struct lec_arp_table *entry;
1492  int i;
1493 
1494  cancel_delayed_work_sync(&priv->lec_arp_work);
1495 
1496  /*
1497  * Remove all entries
1498  */
1499 
1500  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1501  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1502  hlist_for_each_entry_safe(entry, node, next,
1503  &priv->lec_arp_tables[i], next) {
1504  lec_arp_remove(priv, entry);
1505  lec_arp_put(entry);
1506  }
1507  INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1508  }
1509 
1510  hlist_for_each_entry_safe(entry, node, next,
1511  &priv->lec_arp_empty_ones, next) {
1512  del_timer_sync(&entry->timer);
1513  lec_arp_clear_vccs(entry);
1514  hlist_del(&entry->next);
1515  lec_arp_put(entry);
1516  }
1517  INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1518 
1519  hlist_for_each_entry_safe(entry, node, next,
1520  &priv->lec_no_forward, next) {
1521  del_timer_sync(&entry->timer);
1522  lec_arp_clear_vccs(entry);
1523  hlist_del(&entry->next);
1524  lec_arp_put(entry);
1525  }
1526  INIT_HLIST_HEAD(&priv->lec_no_forward);
1527 
1528  hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1529  /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1530  lec_arp_clear_vccs(entry);
1531  hlist_del(&entry->next);
1532  lec_arp_put(entry);
1533  }
1534  INIT_HLIST_HEAD(&priv->mcast_fwds);
1535  priv->mcast_vcc = NULL;
1536  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1537 }
1538 
1539 /*
1540  * Find entry by mac_address
1541  */
1542 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1543  const unsigned char *mac_addr)
1544 {
1545  struct hlist_node *node;
1546  struct hlist_head *head;
1547  struct lec_arp_table *entry;
1548 
1549  pr_debug("%pM\n", mac_addr);
1550 
1551  head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1552  hlist_for_each_entry(entry, node, head, next) {
1553  if (ether_addr_equal(mac_addr, entry->mac_addr))
1554  return entry;
1555  }
1556  return NULL;
1557 }
1558 
1559 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1560  const unsigned char *mac_addr)
1561 {
1562  struct lec_arp_table *to_return;
1563 
1564  to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1565  if (!to_return) {
1566  pr_info("LEC: Arp entry kmalloc failed\n");
1567  return NULL;
1568  }
1569  memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1570  INIT_HLIST_NODE(&to_return->next);
1571  setup_timer(&to_return->timer, lec_arp_expire_arp,
1572  (unsigned long)to_return);
1573  to_return->last_used = jiffies;
1574  to_return->priv = priv;
1575  skb_queue_head_init(&to_return->tx_wait);
1576  atomic_set(&to_return->usage, 1);
1577  return to_return;
1578 }
1579 
1580 /* Arp sent timer expired */
1581 static void lec_arp_expire_arp(unsigned long data)
1582 {
1583  struct lec_arp_table *entry;
1584 
1585  entry = (struct lec_arp_table *)data;
1586 
1587  pr_debug("\n");
1588  if (entry->status == ESI_ARP_PENDING) {
1589  if (entry->no_tries <= entry->priv->max_retry_count) {
1590  if (entry->is_rdesc)
1591  send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1592  entry->mac_addr, NULL, NULL);
1593  else
1594  send_to_lecd(entry->priv, l_arp_xmt,
1595  entry->mac_addr, NULL, NULL);
1596  entry->no_tries++;
1597  }
1598  mod_timer(&entry->timer, jiffies + (1 * HZ));
1599  }
1600 }
1601 
1602 /* Unknown/unused vcc expire, remove associated entry */
1603 static void lec_arp_expire_vcc(unsigned long data)
1604 {
1605  unsigned long flags;
1606  struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1607  struct lec_priv *priv = to_remove->priv;
1608 
1609  del_timer(&to_remove->timer);
1610 
1611  pr_debug("%p %p: vpi:%d vci:%d\n",
1612  to_remove, priv,
1613  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1614  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1615 
1616  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1617  hlist_del(&to_remove->next);
1618  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1619 
1620  lec_arp_clear_vccs(to_remove);
1621  lec_arp_put(to_remove);
1622 }
1623 
1624 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1625  unsigned long now,
1626  struct lec_priv *priv)
1627 {
1628  unsigned long time_to_check;
1629 
1630  if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1631  time_to_check = priv->forward_delay_time;
1632  else
1633  time_to_check = priv->aging_time;
1634 
1635  pr_debug("About to expire: %lx - %lx > %lx\n",
1636  now, entry->last_used, time_to_check);
1637  if (time_after(now, entry->last_used + time_to_check) &&
1638  !(entry->flags & LEC_PERMANENT_FLAG) &&
1639  !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1640  /* Remove entry */
1641  pr_debug("Entry timed out\n");
1642  lec_arp_remove(priv, entry);
1643  lec_arp_put(entry);
1644  } else {
1645  /* Something else */
1646  if ((entry->status == ESI_VC_PENDING ||
1647  entry->status == ESI_ARP_PENDING) &&
1648  time_after_eq(now, entry->timestamp +
1649  priv->max_unknown_frame_time)) {
1650  entry->timestamp = jiffies;
1651  entry->packets_flooded = 0;
1652  if (entry->status == ESI_VC_PENDING)
1653  send_to_lecd(priv, l_svc_setup,
1654  entry->mac_addr,
1655  entry->atm_addr,
1656  NULL);
1657  }
1658  if (entry->status == ESI_FLUSH_PENDING &&
1659  time_after_eq(now, entry->timestamp +
1660  priv->path_switching_delay)) {
1661  lec_arp_hold(entry);
1662  return true;
1663  }
1664  }
1665 
1666  return false;
1667 }
1668 /*
1669  * Expire entries.
1670  * 1. Re-set timer
1671  * 2. For each entry, delete entries that have aged past the age limit.
1672  * 3. For each entry, depending on the status of the entry, perform
1673  * the following maintenance.
1674  * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1675  * tick_count is above the max_unknown_frame_time, clear
1676  * the tick_count to zero and clear the packets_flooded counter
1677  * to zero. This supports the packet rate limit per address
1678  * while flooding unknowns.
1679  * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1680  * than or equal to the path_switching_delay, change the status
1681  * to ESI_FORWARD_DIRECT. This causes the flush period to end
1682  * regardless of the progress of the flush protocol.
1683  */
1684 static void lec_arp_check_expire(struct work_struct *work)
1685 {
1686  unsigned long flags;
1687  struct lec_priv *priv =
1688  container_of(work, struct lec_priv, lec_arp_work.work);
1689  struct hlist_node *node, *next;
1690  struct lec_arp_table *entry;
1691  unsigned long now;
1692  int i;
1693 
1694  pr_debug("%p\n", priv);
1695  now = jiffies;
1696 restart:
1697  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1698  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1699  hlist_for_each_entry_safe(entry, node, next,
1700  &priv->lec_arp_tables[i], next) {
1701  if (__lec_arp_check_expire(entry, now, priv)) {
1702  struct sk_buff *skb;
1703  struct atm_vcc *vcc = entry->vcc;
1704 
1705  spin_unlock_irqrestore(&priv->lec_arp_lock,
1706  flags);
1707  while ((skb = skb_dequeue(&entry->tx_wait)))
1708  lec_send(vcc, skb);
1709  entry->last_used = jiffies;
1710  entry->status = ESI_FORWARD_DIRECT;
1711  lec_arp_put(entry);
1712 
1713  goto restart;
1714  }
1715  }
1716  }
1717  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1718 
1719  schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1720 }
1721 
1722 /*
1723  * Try to find vcc where mac_address is attached.
1724  *
1725  */
1726 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1727  const unsigned char *mac_to_find,
1728  int is_rdesc,
1729  struct lec_arp_table **ret_entry)
1730 {
1731  unsigned long flags;
1732  struct lec_arp_table *entry;
1733  struct atm_vcc *found;
1734 
1735  if (mac_to_find[0] & 0x01) {
1736  switch (priv->lane_version) {
1737  case 1:
1738  return priv->mcast_vcc;
1739  case 2: /* LANE2 wants arp for multicast addresses */
1740  if (ether_addr_equal(mac_to_find, bus_mac))
1741  return priv->mcast_vcc;
1742  break;
1743  default:
1744  break;
1745  }
1746  }
1747 
1748  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1749  entry = lec_arp_find(priv, mac_to_find);
1750 
1751  if (entry) {
1752  if (entry->status == ESI_FORWARD_DIRECT) {
1753  /* Connection Ok */
1754  entry->last_used = jiffies;
1755  lec_arp_hold(entry);
1756  *ret_entry = entry;
1757  found = entry->vcc;
1758  goto out;
1759  }
1760  /*
1761  * If the LE_ARP cache entry is still pending, reset count to 0
1762  * so another LE_ARP request can be made for this frame.
1763  */
1764  if (entry->status == ESI_ARP_PENDING)
1765  entry->no_tries = 0;
1766  /*
1767  * Data direct VC not yet set up, check to see if the unknown
1768  * frame count is greater than the limit. If the limit has
1769  * not been reached, allow the caller to send packet to
1770  * BUS.
1771  */
1772  if (entry->status != ESI_FLUSH_PENDING &&
1773  entry->packets_flooded <
1774  priv->maximum_unknown_frame_count) {
1775  entry->packets_flooded++;
1776  pr_debug("Flooding..\n");
1777  found = priv->mcast_vcc;
1778  goto out;
1779  }
1780  /*
1781  * We got here because entry->status == ESI_FLUSH_PENDING
1782  * or BUS flood limit was reached for an entry which is
1783  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1784  */
1785  lec_arp_hold(entry);
1786  *ret_entry = entry;
1787  pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1788  entry->vcc);
1789  found = NULL;
1790  } else {
1791  /* No matching entry was found */
1792  entry = make_entry(priv, mac_to_find);
1793  pr_debug("Making entry\n");
1794  if (!entry) {
1795  found = priv->mcast_vcc;
1796  goto out;
1797  }
1798  lec_arp_add(priv, entry);
1799  /* We want arp-request(s) to be sent */
1800  entry->packets_flooded = 1;
1801  entry->status = ESI_ARP_PENDING;
1802  entry->no_tries = 1;
1803  entry->last_used = entry->timestamp = jiffies;
1804  entry->is_rdesc = is_rdesc;
1805  if (entry->is_rdesc)
1806  send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1807  NULL);
1808  else
1809  send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1810  entry->timer.expires = jiffies + (1 * HZ);
1811  entry->timer.function = lec_arp_expire_arp;
1812  add_timer(&entry->timer);
1813  found = priv->mcast_vcc;
1814  }
1815 
1816 out:
1817  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1818  return found;
1819 }
1820 
1821 static int
1822 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1823  unsigned long permanent)
1824 {
1825  unsigned long flags;
1826  struct hlist_node *node, *next;
1827  struct lec_arp_table *entry;
1828  int i;
1829 
1830  pr_debug("\n");
1831  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1832  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1833  hlist_for_each_entry_safe(entry, node, next,
1834  &priv->lec_arp_tables[i], next) {
1835  if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1836  (permanent ||
1837  !(entry->flags & LEC_PERMANENT_FLAG))) {
1838  lec_arp_remove(priv, entry);
1839  lec_arp_put(entry);
1840  }
1841  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1842  return 0;
1843  }
1844  }
1845  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1846  return -1;
1847 }
1848 
1849 /*
1850  * Notifies: Response to arp_request (atm_addr != NULL)
1851  */
1852 static void
1853 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1854  const unsigned char *atm_addr, unsigned long remoteflag,
1855  unsigned int targetless_le_arp)
1856 {
1857  unsigned long flags;
1858  struct hlist_node *node, *next;
1859  struct lec_arp_table *entry, *tmp;
1860  int i;
1861 
1862  pr_debug("%smac:%pM\n",
1863  (targetless_le_arp) ? "targetless " : "", mac_addr);
1864 
1865  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1866  entry = lec_arp_find(priv, mac_addr);
1867  if (entry == NULL && targetless_le_arp)
1868  goto out; /*
1869  * LANE2: ignore targetless LE_ARPs for which
1870  * we have no entry in the cache. 7.1.30
1871  */
1872  if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1873  hlist_for_each_entry_safe(entry, node, next,
1874  &priv->lec_arp_empty_ones, next) {
1875  if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1876  hlist_del(&entry->next);
1877  del_timer(&entry->timer);
1878  tmp = lec_arp_find(priv, mac_addr);
1879  if (tmp) {
1880  del_timer(&tmp->timer);
1881  tmp->status = ESI_FORWARD_DIRECT;
1882  memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1883  tmp->vcc = entry->vcc;
1884  tmp->old_push = entry->old_push;
1885  tmp->last_used = jiffies;
1886  del_timer(&entry->timer);
1887  lec_arp_put(entry);
1888  entry = tmp;
1889  } else {
1890  entry->status = ESI_FORWARD_DIRECT;
1891  memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
1892  entry->last_used = jiffies;
1893  lec_arp_add(priv, entry);
1894  }
1895  if (remoteflag)
1896  entry->flags |= LEC_REMOTE_FLAG;
1897  else
1898  entry->flags &= ~LEC_REMOTE_FLAG;
1899  pr_debug("After update\n");
1900  dump_arp_table(priv);
1901  goto out;
1902  }
1903  }
1904  }
1905 
1906  entry = lec_arp_find(priv, mac_addr);
1907  if (!entry) {
1908  entry = make_entry(priv, mac_addr);
1909  if (!entry)
1910  goto out;
1911  entry->status = ESI_UNKNOWN;
1912  lec_arp_add(priv, entry);
1913  /* Temporary, changes before end of function */
1914  }
1915  memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1916  del_timer(&entry->timer);
1917  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1918  hlist_for_each_entry(tmp, node,
1919  &priv->lec_arp_tables[i], next) {
1920  if (entry != tmp &&
1921  !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1922  /* Vcc to this host exists */
1923  if (tmp->status > ESI_VC_PENDING) {
1924  /*
1925  * ESI_FLUSH_PENDING,
1926  * ESI_FORWARD_DIRECT
1927  */
1928  entry->vcc = tmp->vcc;
1929  entry->old_push = tmp->old_push;
1930  }
1931  entry->status = tmp->status;
1932  break;
1933  }
1934  }
1935  }
1936  if (remoteflag)
1937  entry->flags |= LEC_REMOTE_FLAG;
1938  else
1939  entry->flags &= ~LEC_REMOTE_FLAG;
1940  if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1941  entry->status = ESI_VC_PENDING;
1942  send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1943  }
1944  pr_debug("After update2\n");
1945  dump_arp_table(priv);
1946 out:
1947  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1948 }
1949 
1950 /*
1951  * Notifies: Vcc setup ready
1952  */
1953 static void
1954 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1955  struct atm_vcc *vcc,
1956  void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1957 {
1958  unsigned long flags;
1959  struct hlist_node *node;
1960  struct lec_arp_table *entry;
1961  int i, found_entry = 0;
1962 
1963  spin_lock_irqsave(&priv->lec_arp_lock, flags);
1964  /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1965  if (ioc_data->receive == 2) {
1966  pr_debug("LEC_ARP: Attaching mcast forward\n");
1967 #if 0
1968  entry = lec_arp_find(priv, bus_mac);
1969  if (!entry) {
1970  pr_info("LEC_ARP: Multicast entry not found!\n");
1971  goto out;
1972  }
1973  memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1974  entry->recv_vcc = vcc;
1975  entry->old_recv_push = old_push;
1976 #endif
1977  entry = make_entry(priv, bus_mac);
1978  if (entry == NULL)
1979  goto out;
1980  del_timer(&entry->timer);
1981  memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1982  entry->recv_vcc = vcc;
1983  entry->old_recv_push = old_push;
1984  hlist_add_head(&entry->next, &priv->mcast_fwds);
1985  goto out;
1986  } else if (ioc_data->receive == 1) {
1987  /*
1988  * Vcc which we don't want to make default vcc,
1989  * attach it anyway.
1990  */
1991  pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1992  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1993  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1994  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1995  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1996  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1997  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1998  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1999  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2000  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2001  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2002  entry = make_entry(priv, bus_mac);
2003  if (entry == NULL)
2004  goto out;
2005  memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2006  memset(entry->mac_addr, 0, ETH_ALEN);
2007  entry->recv_vcc = vcc;
2008  entry->old_recv_push = old_push;
2009  entry->status = ESI_UNKNOWN;
2010  entry->timer.expires = jiffies + priv->vcc_timeout_period;
2011  entry->timer.function = lec_arp_expire_vcc;
2012  hlist_add_head(&entry->next, &priv->lec_no_forward);
2013  add_timer(&entry->timer);
2014  dump_arp_table(priv);
2015  goto out;
2016  }
2017  pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2018  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2019  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2020  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2021  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2022  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2023  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2024  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2025  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2026  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2027  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2028  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2029  hlist_for_each_entry(entry, node,
2030  &priv->lec_arp_tables[i], next) {
2031  if (memcmp
2032  (ioc_data->atm_addr, entry->atm_addr,
2033  ATM_ESA_LEN) == 0) {
2034  pr_debug("LEC_ARP: Attaching data direct\n");
2035  pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2036  entry->vcc ? entry->vcc->vci : 0,
2037  entry->recv_vcc ? entry->recv_vcc->
2038  vci : 0);
2039  found_entry = 1;
2040  del_timer(&entry->timer);
2041  entry->vcc = vcc;
2042  entry->old_push = old_push;
2043  if (entry->status == ESI_VC_PENDING) {
2044  if (priv->maximum_unknown_frame_count
2045  == 0)
2046  entry->status =
2047  ESI_FORWARD_DIRECT;
2048  else {
2049  entry->timestamp = jiffies;
2050  entry->status =
2051  ESI_FLUSH_PENDING;
2052 #if 0
2053  send_to_lecd(priv, l_flush_xmt,
2054  NULL,
2055  entry->atm_addr,
2056  NULL);
2057 #endif
2058  }
2059  } else {
2060  /*
2061  * They were forming a connection
2062  * to us, and we to them. Our
2063  * ATM address is numerically lower
2064  * than theirs, so we make connection
2065  * we formed into default VCC (8.1.11).
2066  * Connection they made gets torn
2067  * down. This might confuse some
2068  * clients. Can be changed if
2069  * someone reports trouble...
2070  */
2071  ;
2072  }
2073  }
2074  }
2075  }
2076  if (found_entry) {
2077  pr_debug("After vcc was added\n");
2078  dump_arp_table(priv);
2079  goto out;
2080  }
2081  /*
2082  * Not found, snatch address from first data packet that arrives
2083  * from this vcc
2084  */
2085  entry = make_entry(priv, bus_mac);
2086  if (!entry)
2087  goto out;
2088  entry->vcc = vcc;
2089  entry->old_push = old_push;
2090  memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2091  memset(entry->mac_addr, 0, ETH_ALEN);
2092  entry->status = ESI_UNKNOWN;
2093  hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2094  entry->timer.expires = jiffies + priv->vcc_timeout_period;
2095  entry->timer.function = lec_arp_expire_vcc;
2096  add_timer(&entry->timer);
2097  pr_debug("After vcc was added\n");
2098  dump_arp_table(priv);
2099 out:
2100  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2101 }
2102 
2103 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2104 {
2105  unsigned long flags;
2106  struct hlist_node *node;
2107  struct lec_arp_table *entry;
2108  int i;
2109 
2110  pr_debug("%lx\n", tran_id);
2111 restart:
2112  spin_lock_irqsave(&priv->lec_arp_lock, flags);
2113  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2114  hlist_for_each_entry(entry, node,
2115  &priv->lec_arp_tables[i], next) {
2116  if (entry->flush_tran_id == tran_id &&
2117  entry->status == ESI_FLUSH_PENDING) {
2118  struct sk_buff *skb;
2119  struct atm_vcc *vcc = entry->vcc;
2120 
2121  lec_arp_hold(entry);
2122  spin_unlock_irqrestore(&priv->lec_arp_lock,
2123  flags);
2124  while ((skb = skb_dequeue(&entry->tx_wait)))
2125  lec_send(vcc, skb);
2126  entry->last_used = jiffies;
2127  entry->status = ESI_FORWARD_DIRECT;
2128  lec_arp_put(entry);
2129  pr_debug("LEC_ARP: Flushed\n");
2130  goto restart;
2131  }
2132  }
2133  }
2134  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2135  dump_arp_table(priv);
2136 }
2137 
2138 static void
2139 lec_set_flush_tran_id(struct lec_priv *priv,
2140  const unsigned char *atm_addr, unsigned long tran_id)
2141 {
2142  unsigned long flags;
2143  struct hlist_node *node;
2144  struct lec_arp_table *entry;
2145  int i;
2146 
2147  spin_lock_irqsave(&priv->lec_arp_lock, flags);
2148  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2149  hlist_for_each_entry(entry, node,
2150  &priv->lec_arp_tables[i], next) {
2151  if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2152  entry->flush_tran_id = tran_id;
2153  pr_debug("Set flush transaction id to %lx for %p\n",
2154  tran_id, entry);
2155  }
2156  }
2157  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2158 }
2159 
2160 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2161 {
2162  unsigned long flags;
2163  unsigned char mac_addr[] = {
2164  0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2165  };
2166  struct lec_arp_table *to_add;
2167  struct lec_vcc_priv *vpriv;
2168  int err = 0;
2169 
2170  vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2171  if (!vpriv)
2172  return -ENOMEM;
2173  vpriv->xoff = 0;
2174  vpriv->old_pop = vcc->pop;
2175  vcc->user_back = vpriv;
2176  vcc->pop = lec_pop;
2177  spin_lock_irqsave(&priv->lec_arp_lock, flags);
2178  to_add = make_entry(priv, mac_addr);
2179  if (!to_add) {
2180  vcc->pop = vpriv->old_pop;
2181  kfree(vpriv);
2182  err = -ENOMEM;
2183  goto out;
2184  }
2185  memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2186  to_add->status = ESI_FORWARD_DIRECT;
2187  to_add->flags |= LEC_PERMANENT_FLAG;
2188  to_add->vcc = vcc;
2189  to_add->old_push = vcc->push;
2190  vcc->push = lec_push;
2191  priv->mcast_vcc = vcc;
2192  lec_arp_add(priv, to_add);
2193 out:
2194  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2195  return err;
2196 }
2197 
2198 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2199 {
2200  unsigned long flags;
2201  struct hlist_node *node, *next;
2202  struct lec_arp_table *entry;
2203  int i;
2204 
2205  pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2206  dump_arp_table(priv);
2207 
2208  spin_lock_irqsave(&priv->lec_arp_lock, flags);
2209 
2210  for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2211  hlist_for_each_entry_safe(entry, node, next,
2212  &priv->lec_arp_tables[i], next) {
2213  if (vcc == entry->vcc) {
2214  lec_arp_remove(priv, entry);
2215  lec_arp_put(entry);
2216  if (priv->mcast_vcc == vcc)
2217  priv->mcast_vcc = NULL;
2218  }
2219  }
2220  }
2221 
2222  hlist_for_each_entry_safe(entry, node, next,
2223  &priv->lec_arp_empty_ones, next) {
2224  if (entry->vcc == vcc) {
2225  lec_arp_clear_vccs(entry);
2226  del_timer(&entry->timer);
2227  hlist_del(&entry->next);
2228  lec_arp_put(entry);
2229  }
2230  }
2231 
2232  hlist_for_each_entry_safe(entry, node, next,
2233  &priv->lec_no_forward, next) {
2234  if (entry->recv_vcc == vcc) {
2235  lec_arp_clear_vccs(entry);
2236  del_timer(&entry->timer);
2237  hlist_del(&entry->next);
2238  lec_arp_put(entry);
2239  }
2240  }
2241 
2242  hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2243  if (entry->recv_vcc == vcc) {
2244  lec_arp_clear_vccs(entry);
2245  /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2246  hlist_del(&entry->next);
2247  lec_arp_put(entry);
2248  }
2249  }
2250 
2251  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2252  dump_arp_table(priv);
2253 }
2254 
2255 static void
2256 lec_arp_check_empties(struct lec_priv *priv,
2257  struct atm_vcc *vcc, struct sk_buff *skb)
2258 {
2259  unsigned long flags;
2260  struct hlist_node *node, *next;
2261  struct lec_arp_table *entry, *tmp;
2262  struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2263  unsigned char *src = hdr->h_source;
2264 
2265  spin_lock_irqsave(&priv->lec_arp_lock, flags);
2266  hlist_for_each_entry_safe(entry, node, next,
2267  &priv->lec_arp_empty_ones, next) {
2268  if (vcc == entry->vcc) {
2269  del_timer(&entry->timer);
2270  memcpy(entry->mac_addr, src, ETH_ALEN);
2271  entry->status = ESI_FORWARD_DIRECT;
2272  entry->last_used = jiffies;
2273  /* We might have got an entry */
2274  tmp = lec_arp_find(priv, src);
2275  if (tmp) {
2276  lec_arp_remove(priv, tmp);
2277  lec_arp_put(tmp);
2278  }
2279  hlist_del(&entry->next);
2280  lec_arp_add(priv, entry);
2281  goto out;
2282  }
2283  }
2284  pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2285 out:
2286  spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2287 }
2288 
2289 MODULE_LICENSE("GPL");
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