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

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