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TOMOYO Linux Cross Reference
Linux/net/atm/lec.c

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

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