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

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