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

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  1 /*
  2  * lec.c: Lan Emulation driver
  3  *
  4  * Marko Kiiskila <mkiiskila@yahoo.com>
  5  */
  6 
  7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  8 
  9 #include <linux/slab.h>
 10 #include <linux/kernel.h>
 11 #include <linux/bitops.h>
 12 #include <linux/capability.h>
 13 
 14 /* We are ethernet device */
 15 #include <linux/if_ether.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/etherdevice.h>
 18 #include <net/sock.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/ip.h>
 21 #include <asm/byteorder.h>
 22 #include <linux/uaccess.h>
 23 #include <net/arp.h>
 24 #include <net/dst.h>
 25 #include <linux/proc_fs.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/seq_file.h>
 28 
 29 /* And atm device */
 30 #include <linux/atmdev.h>
 31 #include <linux/atmlec.h>
 32 
 33 /* Proxy LEC knows about bridging */
 34 #if IS_ENABLED(CONFIG_BRIDGE)
 35 #include "../bridge/br_private.h"
 36 
 37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
 38 #endif
 39 
 40 /* Modular too */
 41 #include <linux/module.h>
 42 #include <linux/init.h>
 43 
 44 /* Hardening for Spectre-v1 */
 45 #include <linux/nospec.h>
 46 
 47 #include "lec.h"
 48 #include "lec_arpc.h"
 49 #include "resources.h"
 50 
 51 #define DUMP_PACKETS 0          /*
 52                                  * 0 = None,
 53                                  * 1 = 30 first bytes
 54                                  * 2 = Whole packet
 55                                  */
 56 
 57 #define LEC_UNRES_QUE_LEN 8     /*
 58                                  * number of tx packets to queue for a
 59                                  * single destination while waiting for SVC
 60                                  */
 61 
 62 static int lec_open(struct net_device *dev);
 63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 64                                   struct net_device *dev);
 65 static int lec_close(struct net_device *dev);
 66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
 67                                           const unsigned char *mac_addr);
 68 static int lec_arp_remove(struct lec_priv *priv,
 69                           struct lec_arp_table *to_remove);
 70 /* LANE2 functions */
 71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
 72                                 const u8 *tlvs, u32 sizeoftlvs);
 73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
 74                          u8 **tlvs, u32 *sizeoftlvs);
 75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
 76                                const u8 *tlvs, u32 sizeoftlvs);
 77 
 78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
 79                            unsigned long permanent);
 80 static void lec_arp_check_empties(struct lec_priv *priv,
 81                                   struct atm_vcc *vcc, struct sk_buff *skb);
 82 static void lec_arp_destroy(struct lec_priv *priv);
 83 static void lec_arp_init(struct lec_priv *priv);
 84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
 85                                        const unsigned char *mac_to_find,
 86                                        int is_rdesc,
 87                                        struct lec_arp_table **ret_entry);
 88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
 89                            const unsigned char *atm_addr,
 90                            unsigned long remoteflag,
 91                            unsigned int targetless_le_arp);
 92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
 93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
 94 static void lec_set_flush_tran_id(struct lec_priv *priv,
 95                                   const unsigned char *atm_addr,
 96                                   unsigned long tran_id);
 97 static void lec_vcc_added(struct lec_priv *priv,
 98                           const struct atmlec_ioc *ioc_data,
 99                           struct atm_vcc *vcc,
100                           void (*old_push)(struct atm_vcc *vcc,
101                                            struct sk_buff *skb));
102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
103 
104 /* must be done under lec_arp_lock */
105 static inline void lec_arp_hold(struct lec_arp_table *entry)
106 {
107         refcount_inc(&entry->usage);
108 }
109 
110 static inline void lec_arp_put(struct lec_arp_table *entry)
111 {
112         if (refcount_dec_and_test(&entry->usage))
113                 kfree(entry);
114 }
115 
116 static struct lane2_ops lane2_ops = {
117         .resolve = lane2_resolve,               /* spec 3.1.3 */
118         .associate_req = lane2_associate_req,   /* spec 3.1.4 */
119         .associate_indicator = NULL             /* spec 3.1.5 */
120 };
121 
122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
123 
124 /* Device structures */
125 static struct net_device *dev_lec[MAX_LEC_ITF];
126 
127 #if IS_ENABLED(CONFIG_BRIDGE)
128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
129 {
130         char *buff;
131         struct lec_priv *priv;
132 
133         /*
134          * Check if this is a BPDU. If so, ask zeppelin to send
135          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
136          * as the Config BPDU has
137          */
138         buff = skb->data + skb->dev->hard_header_len;
139         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
140                 struct sock *sk;
141                 struct sk_buff *skb2;
142                 struct atmlec_msg *mesg;
143 
144                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
145                 if (skb2 == NULL)
146                         return;
147                 skb2->len = sizeof(struct atmlec_msg);
148                 mesg = (struct atmlec_msg *)skb2->data;
149                 mesg->type = l_topology_change;
150                 buff += 4;
151                 mesg->content.normal.flag = *buff & 0x01;
152                                         /* 0x01 is topology change */
153 
154                 priv = netdev_priv(dev);
155                 atm_force_charge(priv->lecd, skb2->truesize);
156                 sk = sk_atm(priv->lecd);
157                 skb_queue_tail(&sk->sk_receive_queue, skb2);
158                 sk->sk_data_ready(sk);
159         }
160 }
161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
162 
163 /*
164  * Open/initialize the netdevice. This is called (in the current kernel)
165  * sometime after booting when the 'ifconfig' program is run.
166  *
167  * This routine should set everything up anew at each open, even
168  * registers that "should" only need to be set once at boot, so that
169  * there is non-reboot way to recover if something goes wrong.
170  */
171 
172 static int lec_open(struct net_device *dev)
173 {
174         netif_start_queue(dev);
175 
176         return 0;
177 }
178 
179 static void
180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182         struct net_device *dev = skb->dev;
183 
184         ATM_SKB(skb)->vcc = vcc;
185         atm_account_tx(vcc, skb);
186 
187         if (vcc->send(vcc, skb) < 0) {
188                 dev->stats.tx_dropped++;
189                 return;
190         }
191 
192         dev->stats.tx_packets++;
193         dev->stats.tx_bytes += skb->len;
194 }
195 
196 static void lec_tx_timeout(struct net_device *dev)
197 {
198         pr_info("%s\n", dev->name);
199         netif_trans_update(dev);
200         netif_wake_queue(dev);
201 }
202 
203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
204                                   struct net_device *dev)
205 {
206         struct sk_buff *skb2;
207         struct lec_priv *priv = netdev_priv(dev);
208         struct lecdatahdr_8023 *lec_h;
209         struct atm_vcc *vcc;
210         struct lec_arp_table *entry;
211         unsigned char *dst;
212         int min_frame_size;
213         int is_rdesc;
214 
215         pr_debug("called\n");
216         if (!priv->lecd) {
217                 pr_info("%s:No lecd attached\n", dev->name);
218                 dev->stats.tx_errors++;
219                 netif_stop_queue(dev);
220                 kfree_skb(skb);
221                 return NETDEV_TX_OK;
222         }
223 
224         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
225                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
226                  (long)skb_end_pointer(skb));
227 #if IS_ENABLED(CONFIG_BRIDGE)
228         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
229                 lec_handle_bridge(skb, dev);
230 #endif
231 
232         /* Make sure we have room for lec_id */
233         if (skb_headroom(skb) < 2) {
234                 pr_debug("reallocating skb\n");
235                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
236                 if (unlikely(!skb2)) {
237                         kfree_skb(skb);
238                         return NETDEV_TX_OK;
239                 }
240                 consume_skb(skb);
241                 skb = skb2;
242         }
243         skb_push(skb, 2);
244 
245         /* Put le header to place */
246         lec_h = (struct lecdatahdr_8023 *)skb->data;
247         lec_h->le_header = htons(priv->lecid);
248 
249 #if DUMP_PACKETS >= 2
250 #define MAX_DUMP_SKB 99
251 #elif DUMP_PACKETS >= 1
252 #define MAX_DUMP_SKB 30
253 #endif
254 #if DUMP_PACKETS >= 1
255         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
256                dev->name, skb->len, priv->lecid);
257         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
258                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
259 #endif /* DUMP_PACKETS >= 1 */
260 
261         /* Minimum ethernet-frame size */
262         min_frame_size = LEC_MINIMUM_8023_SIZE;
263         if (skb->len < min_frame_size) {
264                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
265                         skb2 = skb_copy_expand(skb, 0,
266                                                min_frame_size - skb->truesize,
267                                                GFP_ATOMIC);
268                         dev_kfree_skb(skb);
269                         if (skb2 == NULL) {
270                                 dev->stats.tx_dropped++;
271                                 return NETDEV_TX_OK;
272                         }
273                         skb = skb2;
274                 }
275                 skb_put(skb, min_frame_size - skb->len);
276         }
277 
278         /* Send to right vcc */
279         is_rdesc = 0;
280         dst = lec_h->h_dest;
281         entry = NULL;
282         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
283         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
284                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
285         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
286                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
287                         pr_debug("%s:queuing packet, MAC address %pM\n",
288                                  dev->name, lec_h->h_dest);
289                         skb_queue_tail(&entry->tx_wait, skb);
290                 } else {
291                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
292                                  dev->name, lec_h->h_dest);
293                         dev->stats.tx_dropped++;
294                         dev_kfree_skb(skb);
295                 }
296                 goto out;
297         }
298 #if DUMP_PACKETS > 0
299         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
300                dev->name, vcc->vpi, vcc->vci);
301 #endif /* DUMP_PACKETS > 0 */
302 
303         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
304                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
305                 lec_send(vcc, skb2);
306         }
307 
308         lec_send(vcc, skb);
309 
310         if (!atm_may_send(vcc, 0)) {
311                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
312 
313                 vpriv->xoff = 1;
314                 netif_stop_queue(dev);
315 
316                 /*
317                  * vcc->pop() might have occurred in between, making
318                  * the vcc usuable again.  Since xmit is serialized,
319                  * this is the only situation we have to re-test.
320                  */
321 
322                 if (atm_may_send(vcc, 0))
323                         netif_wake_queue(dev);
324         }
325 
326 out:
327         if (entry)
328                 lec_arp_put(entry);
329         netif_trans_update(dev);
330         return NETDEV_TX_OK;
331 }
332 
333 /* The inverse routine to net_open(). */
334 static int lec_close(struct net_device *dev)
335 {
336         netif_stop_queue(dev);
337         return 0;
338 }
339 
340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
341 {
342         unsigned long flags;
343         struct net_device *dev = (struct net_device *)vcc->proto_data;
344         struct lec_priv *priv = netdev_priv(dev);
345         struct atmlec_msg *mesg;
346         struct lec_arp_table *entry;
347         int i;
348         char *tmp;              /* FIXME */
349 
350         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
351         mesg = (struct atmlec_msg *)skb->data;
352         tmp = skb->data;
353         tmp += sizeof(struct atmlec_msg);
354         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
355         switch (mesg->type) {
356         case l_set_mac_addr:
357                 for (i = 0; i < 6; i++)
358                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
359                 break;
360         case l_del_mac_addr:
361                 for (i = 0; i < 6; i++)
362                         dev->dev_addr[i] = 0;
363                 break;
364         case l_addr_delete:
365                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
366                                 mesg->content.normal.flag);
367                 break;
368         case l_topology_change:
369                 priv->topology_change = mesg->content.normal.flag;
370                 break;
371         case l_flush_complete:
372                 lec_flush_complete(priv, mesg->content.normal.flag);
373                 break;
374         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
375                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
376                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
377                 lec_arp_remove(priv, entry);
378                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
379 
380                 if (mesg->content.normal.no_source_le_narp)
381                         break;
382                 /* FALL THROUGH */
383         case l_arp_update:
384                 lec_arp_update(priv, mesg->content.normal.mac_addr,
385                                mesg->content.normal.atm_addr,
386                                mesg->content.normal.flag,
387                                mesg->content.normal.targetless_le_arp);
388                 pr_debug("in l_arp_update\n");
389                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
390                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
391                                  mesg->sizeoftlvs);
392                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
393                                             tmp, mesg->sizeoftlvs);
394                 }
395                 break;
396         case l_config:
397                 priv->maximum_unknown_frame_count =
398                     mesg->content.config.maximum_unknown_frame_count;
399                 priv->max_unknown_frame_time =
400                     (mesg->content.config.max_unknown_frame_time * HZ);
401                 priv->max_retry_count = mesg->content.config.max_retry_count;
402                 priv->aging_time = (mesg->content.config.aging_time * HZ);
403                 priv->forward_delay_time =
404                     (mesg->content.config.forward_delay_time * HZ);
405                 priv->arp_response_time =
406                     (mesg->content.config.arp_response_time * HZ);
407                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
408                 priv->path_switching_delay =
409                     (mesg->content.config.path_switching_delay * HZ);
410                 priv->lane_version = mesg->content.config.lane_version;
411                                         /* LANE2 */
412                 priv->lane2_ops = NULL;
413                 if (priv->lane_version > 1)
414                         priv->lane2_ops = &lane2_ops;
415                 rtnl_lock();
416                 if (dev_set_mtu(dev, mesg->content.config.mtu))
417                         pr_info("%s: change_mtu to %d failed\n",
418                                 dev->name, mesg->content.config.mtu);
419                 rtnl_unlock();
420                 priv->is_proxy = mesg->content.config.is_proxy;
421                 break;
422         case l_flush_tran_id:
423                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
424                                       mesg->content.normal.flag);
425                 break;
426         case l_set_lecid:
427                 priv->lecid =
428                     (unsigned short)(0xffff & mesg->content.normal.flag);
429                 break;
430         case l_should_bridge:
431 #if IS_ENABLED(CONFIG_BRIDGE)
432         {
433                 pr_debug("%s: bridge zeppelin asks about %pM\n",
434                          dev->name, mesg->content.proxy.mac_addr);
435 
436                 if (br_fdb_test_addr_hook == NULL)
437                         break;
438 
439                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
440                         /* hit from bridge table, send LE_ARP_RESPONSE */
441                         struct sk_buff *skb2;
442                         struct sock *sk;
443 
444                         pr_debug("%s: entry found, responding to zeppelin\n",
445                                  dev->name);
446                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
447                         if (skb2 == NULL)
448                                 break;
449                         skb2->len = sizeof(struct atmlec_msg);
450                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
451                         atm_force_charge(priv->lecd, skb2->truesize);
452                         sk = sk_atm(priv->lecd);
453                         skb_queue_tail(&sk->sk_receive_queue, skb2);
454                         sk->sk_data_ready(sk);
455                 }
456         }
457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
458                 break;
459         default:
460                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
461                 dev_kfree_skb(skb);
462                 return -EINVAL;
463         }
464         dev_kfree_skb(skb);
465         return 0;
466 }
467 
468 static void lec_atm_close(struct atm_vcc *vcc)
469 {
470         struct sk_buff *skb;
471         struct net_device *dev = (struct net_device *)vcc->proto_data;
472         struct lec_priv *priv = netdev_priv(dev);
473 
474         priv->lecd = NULL;
475         /* Do something needful? */
476 
477         netif_stop_queue(dev);
478         lec_arp_destroy(priv);
479 
480         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
481                 pr_info("%s closing with messages pending\n", dev->name);
482         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
483                 atm_return(vcc, skb->truesize);
484                 dev_kfree_skb(skb);
485         }
486 
487         pr_info("%s: Shut down!\n", dev->name);
488         module_put(THIS_MODULE);
489 }
490 
491 static const struct atmdev_ops lecdev_ops = {
492         .close = lec_atm_close,
493         .send = lec_atm_send
494 };
495 
496 static struct atm_dev lecatm_dev = {
497         .ops = &lecdev_ops,
498         .type = "lec",
499         .number = 999,          /* dummy device number */
500         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
501 };
502 
503 /*
504  * LANE2: new argument struct sk_buff *data contains
505  * the LE_ARP based TLVs introduced in the LANE2 spec
506  */
507 static int
508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
509              const unsigned char *mac_addr, const unsigned char *atm_addr,
510              struct sk_buff *data)
511 {
512         struct sock *sk;
513         struct sk_buff *skb;
514         struct atmlec_msg *mesg;
515 
516         if (!priv || !priv->lecd)
517                 return -1;
518         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
519         if (!skb)
520                 return -1;
521         skb->len = sizeof(struct atmlec_msg);
522         mesg = (struct atmlec_msg *)skb->data;
523         memset(mesg, 0, sizeof(struct atmlec_msg));
524         mesg->type = type;
525         if (data != NULL)
526                 mesg->sizeoftlvs = data->len;
527         if (mac_addr)
528                 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
529         else
530                 mesg->content.normal.targetless_le_arp = 1;
531         if (atm_addr)
532                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
533 
534         atm_force_charge(priv->lecd, skb->truesize);
535         sk = sk_atm(priv->lecd);
536         skb_queue_tail(&sk->sk_receive_queue, skb);
537         sk->sk_data_ready(sk);
538 
539         if (data != NULL) {
540                 pr_debug("about to send %d bytes of data\n", data->len);
541                 atm_force_charge(priv->lecd, data->truesize);
542                 skb_queue_tail(&sk->sk_receive_queue, data);
543                 sk->sk_data_ready(sk);
544         }
545 
546         return 0;
547 }
548 
549 static void lec_set_multicast_list(struct net_device *dev)
550 {
551         /*
552          * by default, all multicast frames arrive over the bus.
553          * eventually support selective multicast service
554          */
555 }
556 
557 static const struct net_device_ops lec_netdev_ops = {
558         .ndo_open               = lec_open,
559         .ndo_stop               = lec_close,
560         .ndo_start_xmit         = lec_start_xmit,
561         .ndo_tx_timeout         = lec_tx_timeout,
562         .ndo_set_rx_mode        = lec_set_multicast_list,
563 };
564 
565 static const unsigned char lec_ctrl_magic[] = {
566         0xff,
567         0x00,
568         0x01,
569         0x01
570 };
571 
572 #define LEC_DATA_DIRECT_8023  2
573 #define LEC_DATA_DIRECT_8025  3
574 
575 static int lec_is_data_direct(struct atm_vcc *vcc)
576 {
577         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
578                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
579 }
580 
581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
582 {
583         unsigned long flags;
584         struct net_device *dev = (struct net_device *)vcc->proto_data;
585         struct lec_priv *priv = netdev_priv(dev);
586 
587 #if DUMP_PACKETS > 0
588         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
589                dev->name, vcc->vpi, vcc->vci);
590 #endif
591         if (!skb) {
592                 pr_debug("%s: null skb\n", dev->name);
593                 lec_vcc_close(priv, vcc);
594                 return;
595         }
596 #if DUMP_PACKETS >= 2
597 #define MAX_SKB_DUMP 99
598 #elif DUMP_PACKETS >= 1
599 #define MAX_SKB_DUMP 30
600 #endif
601 #if DUMP_PACKETS > 0
602         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
603                dev->name, skb->len, priv->lecid);
604         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
605                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
606 #endif /* DUMP_PACKETS > 0 */
607         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
608                                 /* Control frame, to daemon */
609                 struct sock *sk = sk_atm(vcc);
610 
611                 pr_debug("%s: To daemon\n", dev->name);
612                 skb_queue_tail(&sk->sk_receive_queue, skb);
613                 sk->sk_data_ready(sk);
614         } else {                /* Data frame, queue to protocol handlers */
615                 struct lec_arp_table *entry;
616                 unsigned char *src, *dst;
617 
618                 atm_return(vcc, skb->truesize);
619                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
620                     !priv->lecd || !(dev->flags & IFF_UP)) {
621                         /*
622                          * Probably looping back, or if lecd is missing,
623                          * lecd has gone down
624                          */
625                         pr_debug("Ignoring frame...\n");
626                         dev_kfree_skb(skb);
627                         return;
628                 }
629                 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
630 
631                 /*
632                  * If this is a Data Direct VCC, and the VCC does not match
633                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
634                  */
635                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
636                 if (lec_is_data_direct(vcc)) {
637                         src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
638                         entry = lec_arp_find(priv, src);
639                         if (entry && entry->vcc != vcc) {
640                                 lec_arp_remove(priv, entry);
641                                 lec_arp_put(entry);
642                         }
643                 }
644                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
645 
646                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
647                     !priv->is_proxy &&  /* Proxy wants all the packets */
648                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
649                         dev_kfree_skb(skb);
650                         return;
651                 }
652                 if (!hlist_empty(&priv->lec_arp_empty_ones))
653                         lec_arp_check_empties(priv, vcc, skb);
654                 skb_pull(skb, 2);       /* skip lec_id */
655                 skb->protocol = eth_type_trans(skb, dev);
656                 dev->stats.rx_packets++;
657                 dev->stats.rx_bytes += skb->len;
658                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
659                 netif_rx(skb);
660         }
661 }
662 
663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
664 {
665         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
666         struct net_device *dev = skb->dev;
667 
668         if (vpriv == NULL) {
669                 pr_info("vpriv = NULL!?!?!?\n");
670                 return;
671         }
672 
673         vpriv->old_pop(vcc, skb);
674 
675         if (vpriv->xoff && atm_may_send(vcc, 0)) {
676                 vpriv->xoff = 0;
677                 if (netif_running(dev) && netif_queue_stopped(dev))
678                         netif_wake_queue(dev);
679         }
680 }
681 
682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
683 {
684         struct lec_vcc_priv *vpriv;
685         int bytes_left;
686         struct atmlec_ioc ioc_data;
687 
688         /* Lecd must be up in this case */
689         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
690         if (bytes_left != 0)
691                 pr_info("copy from user failed for %d bytes\n", bytes_left);
692         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
693                 return -EINVAL;
694         ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
695         if (!dev_lec[ioc_data.dev_num])
696                 return -EINVAL;
697         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
698         if (!vpriv)
699                 return -ENOMEM;
700         vpriv->xoff = 0;
701         vpriv->old_pop = vcc->pop;
702         vcc->user_back = vpriv;
703         vcc->pop = lec_pop;
704         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
705                       &ioc_data, vcc, vcc->push);
706         vcc->proto_data = dev_lec[ioc_data.dev_num];
707         vcc->push = lec_push;
708         return 0;
709 }
710 
711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
712 {
713         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
714                 return -EINVAL;
715         vcc->proto_data = dev_lec[arg];
716         return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
717 }
718 
719 /* Initialize device. */
720 static int lecd_attach(struct atm_vcc *vcc, int arg)
721 {
722         int i;
723         struct lec_priv *priv;
724 
725         if (arg < 0)
726                 i = 0;
727         else
728                 i = arg;
729         if (arg >= MAX_LEC_ITF)
730                 return -EINVAL;
731         if (!dev_lec[i]) {
732                 int size;
733 
734                 size = sizeof(struct lec_priv);
735                 dev_lec[i] = alloc_etherdev(size);
736                 if (!dev_lec[i])
737                         return -ENOMEM;
738                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
739                 dev_lec[i]->max_mtu = 18190;
740                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
741                 if (register_netdev(dev_lec[i])) {
742                         free_netdev(dev_lec[i]);
743                         return -EINVAL;
744                 }
745 
746                 priv = netdev_priv(dev_lec[i]);
747         } else {
748                 priv = netdev_priv(dev_lec[i]);
749                 if (priv->lecd)
750                         return -EADDRINUSE;
751         }
752         lec_arp_init(priv);
753         priv->itfnum = i;       /* LANE2 addition */
754         priv->lecd = vcc;
755         vcc->dev = &lecatm_dev;
756         vcc_insert_socket(sk_atm(vcc));
757 
758         vcc->proto_data = dev_lec[i];
759         set_bit(ATM_VF_META, &vcc->flags);
760         set_bit(ATM_VF_READY, &vcc->flags);
761 
762         /* Set default values to these variables */
763         priv->maximum_unknown_frame_count = 1;
764         priv->max_unknown_frame_time = (1 * HZ);
765         priv->vcc_timeout_period = (1200 * HZ);
766         priv->max_retry_count = 1;
767         priv->aging_time = (300 * HZ);
768         priv->forward_delay_time = (15 * HZ);
769         priv->topology_change = 0;
770         priv->arp_response_time = (1 * HZ);
771         priv->flush_timeout = (4 * HZ);
772         priv->path_switching_delay = (6 * HZ);
773 
774         if (dev_lec[i]->flags & IFF_UP)
775                 netif_start_queue(dev_lec[i]);
776         __module_get(THIS_MODULE);
777         return i;
778 }
779 
780 #ifdef CONFIG_PROC_FS
781 static const char *lec_arp_get_status_string(unsigned char status)
782 {
783         static const char *const lec_arp_status_string[] = {
784                 "ESI_UNKNOWN       ",
785                 "ESI_ARP_PENDING   ",
786                 "ESI_VC_PENDING    ",
787                 "<Undefined>       ",
788                 "ESI_FLUSH_PENDING ",
789                 "ESI_FORWARD_DIRECT"
790         };
791 
792         if (status > ESI_FORWARD_DIRECT)
793                 status = 3;     /* ESI_UNDEFINED */
794         return lec_arp_status_string[status];
795 }
796 
797 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
798 {
799         int i;
800 
801         for (i = 0; i < ETH_ALEN; i++)
802                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
803         seq_printf(seq, " ");
804         for (i = 0; i < ATM_ESA_LEN; i++)
805                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
806         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
807                    entry->flags & 0xffff);
808         if (entry->vcc)
809                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
810         else
811                 seq_printf(seq, "        ");
812         if (entry->recv_vcc) {
813                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
814                            entry->recv_vcc->vci);
815         }
816         seq_putc(seq, '\n');
817 }
818 
819 struct lec_state {
820         unsigned long flags;
821         struct lec_priv *locked;
822         struct hlist_node *node;
823         struct net_device *dev;
824         int itf;
825         int arp_table;
826         int misc_table;
827 };
828 
829 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
830                           loff_t *l)
831 {
832         struct hlist_node *e = state->node;
833 
834         if (!e)
835                 e = tbl->first;
836         if (e == SEQ_START_TOKEN) {
837                 e = tbl->first;
838                 --*l;
839         }
840 
841         for (; e; e = e->next) {
842                 if (--*l < 0)
843                         break;
844         }
845         state->node = e;
846 
847         return (*l < 0) ? state : NULL;
848 }
849 
850 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
851                           struct lec_priv *priv)
852 {
853         void *v = NULL;
854         int p;
855 
856         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
857                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
858                 if (v)
859                         break;
860         }
861         state->arp_table = p;
862         return v;
863 }
864 
865 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
866                            struct lec_priv *priv)
867 {
868         struct hlist_head *lec_misc_tables[] = {
869                 &priv->lec_arp_empty_ones,
870                 &priv->lec_no_forward,
871                 &priv->mcast_fwds
872         };
873         void *v = NULL;
874         int q;
875 
876         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
877                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
878                 if (v)
879                         break;
880         }
881         state->misc_table = q;
882         return v;
883 }
884 
885 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
886                            struct lec_priv *priv)
887 {
888         if (!state->locked) {
889                 state->locked = priv;
890                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
891         }
892         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
893                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
894                 state->locked = NULL;
895                 /* Partial state reset for the next time we get called */
896                 state->arp_table = state->misc_table = 0;
897         }
898         return state->locked;
899 }
900 
901 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
902 {
903         struct net_device *dev;
904         void *v;
905 
906         dev = state->dev ? state->dev : dev_lec[state->itf];
907         v = (dev && netdev_priv(dev)) ?
908                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
909         if (!v && dev) {
910                 dev_put(dev);
911                 /* Partial state reset for the next time we get called */
912                 dev = NULL;
913         }
914         state->dev = dev;
915         return v;
916 }
917 
918 static void *lec_get_idx(struct lec_state *state, loff_t l)
919 {
920         void *v = NULL;
921 
922         for (; state->itf < MAX_LEC_ITF; state->itf++) {
923                 v = lec_itf_walk(state, &l);
924                 if (v)
925                         break;
926         }
927         return v;
928 }
929 
930 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
931 {
932         struct lec_state *state = seq->private;
933 
934         state->itf = 0;
935         state->dev = NULL;
936         state->locked = NULL;
937         state->arp_table = 0;
938         state->misc_table = 0;
939         state->node = SEQ_START_TOKEN;
940 
941         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
942 }
943 
944 static void lec_seq_stop(struct seq_file *seq, void *v)
945 {
946         struct lec_state *state = seq->private;
947 
948         if (state->dev) {
949                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
950                                        state->flags);
951                 dev_put(state->dev);
952         }
953 }
954 
955 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
956 {
957         struct lec_state *state = seq->private;
958 
959         v = lec_get_idx(state, 1);
960         *pos += !!PTR_ERR(v);
961         return v;
962 }
963 
964 static int lec_seq_show(struct seq_file *seq, void *v)
965 {
966         static const char lec_banner[] =
967             "Itf  MAC          ATM destination"
968             "                          Status            Flags "
969             "VPI/VCI Recv VPI/VCI\n";
970 
971         if (v == SEQ_START_TOKEN)
972                 seq_puts(seq, lec_banner);
973         else {
974                 struct lec_state *state = seq->private;
975                 struct net_device *dev = state->dev;
976                 struct lec_arp_table *entry = hlist_entry(state->node,
977                                                           struct lec_arp_table,
978                                                           next);
979 
980                 seq_printf(seq, "%s ", dev->name);
981                 lec_info(seq, entry);
982         }
983         return 0;
984 }
985 
986 static const struct seq_operations lec_seq_ops = {
987         .start = lec_seq_start,
988         .next = lec_seq_next,
989         .stop = lec_seq_stop,
990         .show = lec_seq_show,
991 };
992 
993 static int lec_seq_open(struct inode *inode, struct file *file)
994 {
995         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
996 }
997 
998 static const struct file_operations lec_seq_fops = {
999         .open = lec_seq_open,
1000         .read = seq_read,
1001         .llseek = seq_lseek,
1002         .release = seq_release_private,
1003 };
1004 #endif
1005 
1006 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1007 {
1008         struct atm_vcc *vcc = ATM_SD(sock);
1009         int err = 0;
1010 
1011         switch (cmd) {
1012         case ATMLEC_CTRL:
1013         case ATMLEC_MCAST:
1014         case ATMLEC_DATA:
1015                 if (!capable(CAP_NET_ADMIN))
1016                         return -EPERM;
1017                 break;
1018         default:
1019                 return -ENOIOCTLCMD;
1020         }
1021 
1022         switch (cmd) {
1023         case ATMLEC_CTRL:
1024                 err = lecd_attach(vcc, (int)arg);
1025                 if (err >= 0)
1026                         sock->state = SS_CONNECTED;
1027                 break;
1028         case ATMLEC_MCAST:
1029                 err = lec_mcast_attach(vcc, (int)arg);
1030                 break;
1031         case ATMLEC_DATA:
1032                 err = lec_vcc_attach(vcc, (void __user *)arg);
1033                 break;
1034         }
1035 
1036         return err;
1037 }
1038 
1039 static struct atm_ioctl lane_ioctl_ops = {
1040         .owner = THIS_MODULE,
1041         .ioctl = lane_ioctl,
1042 };
1043 
1044 static int __init lane_module_init(void)
1045 {
1046 #ifdef CONFIG_PROC_FS
1047         struct proc_dir_entry *p;
1048 
1049         p = proc_create("lec", 0444, atm_proc_root, &lec_seq_fops);
1050         if (!p) {
1051                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1052                 return -ENOMEM;
1053         }
1054 #endif
1055 
1056         register_atm_ioctl(&lane_ioctl_ops);
1057         pr_info("lec.c: initialized\n");
1058         return 0;
1059 }
1060 
1061 static void __exit lane_module_cleanup(void)
1062 {
1063         int i;
1064 
1065 #ifdef CONFIG_PROC_FS
1066         remove_proc_entry("lec", atm_proc_root);
1067 #endif
1068 
1069         deregister_atm_ioctl(&lane_ioctl_ops);
1070 
1071         for (i = 0; i < MAX_LEC_ITF; i++) {
1072                 if (dev_lec[i] != NULL) {
1073                         unregister_netdev(dev_lec[i]);
1074                         free_netdev(dev_lec[i]);
1075                         dev_lec[i] = NULL;
1076                 }
1077         }
1078 }
1079 
1080 module_init(lane_module_init);
1081 module_exit(lane_module_cleanup);
1082 
1083 /*
1084  * LANE2: 3.1.3, LE_RESOLVE.request
1085  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1086  * If sizeoftlvs == NULL the default TLVs associated with with this
1087  * lec will be used.
1088  * If dst_mac == NULL, targetless LE_ARP will be sent
1089  */
1090 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1091                          u8 **tlvs, u32 *sizeoftlvs)
1092 {
1093         unsigned long flags;
1094         struct lec_priv *priv = netdev_priv(dev);
1095         struct lec_arp_table *table;
1096         struct sk_buff *skb;
1097         int retval;
1098 
1099         if (force == 0) {
1100                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1101                 table = lec_arp_find(priv, dst_mac);
1102                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1103                 if (table == NULL)
1104                         return -1;
1105 
1106                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1107                 if (*tlvs == NULL)
1108                         return -1;
1109 
1110                 *sizeoftlvs = table->sizeoftlvs;
1111 
1112                 return 0;
1113         }
1114 
1115         if (sizeoftlvs == NULL)
1116                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1117 
1118         else {
1119                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1120                 if (skb == NULL)
1121                         return -1;
1122                 skb->len = *sizeoftlvs;
1123                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1124                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1125         }
1126         return retval;
1127 }
1128 
1129 /*
1130  * LANE2: 3.1.4, LE_ASSOCIATE.request
1131  * Associate the *tlvs with the *lan_dst address.
1132  * Will overwrite any previous association
1133  * Returns 1 for success, 0 for failure (out of memory)
1134  *
1135  */
1136 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1137                                const u8 *tlvs, u32 sizeoftlvs)
1138 {
1139         int retval;
1140         struct sk_buff *skb;
1141         struct lec_priv *priv = netdev_priv(dev);
1142 
1143         if (!ether_addr_equal(lan_dst, dev->dev_addr))
1144                 return 0;       /* not our mac address */
1145 
1146         kfree(priv->tlvs);      /* NULL if there was no previous association */
1147 
1148         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1149         if (priv->tlvs == NULL)
1150                 return 0;
1151         priv->sizeoftlvs = sizeoftlvs;
1152 
1153         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1154         if (skb == NULL)
1155                 return 0;
1156         skb->len = sizeoftlvs;
1157         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1158         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1159         if (retval != 0)
1160                 pr_info("lec.c: lane2_associate_req() failed\n");
1161         /*
1162          * If the previous association has changed we must
1163          * somehow notify other LANE entities about the change
1164          */
1165         return 1;
1166 }
1167 
1168 /*
1169  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1170  *
1171  */
1172 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1173                                 const u8 *tlvs, u32 sizeoftlvs)
1174 {
1175 #if 0
1176         int i = 0;
1177 #endif
1178         struct lec_priv *priv = netdev_priv(dev);
1179 #if 0                           /*
1180                                  * Why have the TLVs in LE_ARP entries
1181                                  * since we do not use them? When you
1182                                  * uncomment this code, make sure the
1183                                  * TLVs get freed when entry is killed
1184                                  */
1185         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1186 
1187         if (entry == NULL)
1188                 return;         /* should not happen */
1189 
1190         kfree(entry->tlvs);
1191 
1192         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1193         if (entry->tlvs == NULL)
1194                 return;
1195         entry->sizeoftlvs = sizeoftlvs;
1196 #endif
1197 #if 0
1198         pr_info("\n");
1199         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1200         while (i < sizeoftlvs)
1201                 pr_cont("%02x ", tlvs[i++]);
1202 
1203         pr_cont("\n");
1204 #endif
1205 
1206         /* tell MPOA about the TLVs we saw */
1207         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1208                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1209                                                      tlvs, sizeoftlvs);
1210         }
1211 }
1212 
1213 /*
1214  * Here starts what used to lec_arpc.c
1215  *
1216  * lec_arpc.c was added here when making
1217  * lane client modular. October 1997
1218  */
1219 
1220 #include <linux/types.h>
1221 #include <linux/timer.h>
1222 #include <linux/param.h>
1223 #include <linux/atomic.h>
1224 #include <linux/inetdevice.h>
1225 #include <net/route.h>
1226 
1227 #if 0
1228 #define pr_debug(format, args...)
1229 /*
1230   #define pr_debug printk
1231 */
1232 #endif
1233 #define DEBUG_ARP_TABLE 0
1234 
1235 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1236 
1237 static void lec_arp_check_expire(struct work_struct *work);
1238 static void lec_arp_expire_arp(struct timer_list *t);
1239 
1240 /*
1241  * Arp table funcs
1242  */
1243 
1244 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1245 
1246 /*
1247  * Initialization of arp-cache
1248  */
1249 static void lec_arp_init(struct lec_priv *priv)
1250 {
1251         unsigned short i;
1252 
1253         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1254                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1255         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1256         INIT_HLIST_HEAD(&priv->lec_no_forward);
1257         INIT_HLIST_HEAD(&priv->mcast_fwds);
1258         spin_lock_init(&priv->lec_arp_lock);
1259         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1260         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1261 }
1262 
1263 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1264 {
1265         if (entry->vcc) {
1266                 struct atm_vcc *vcc = entry->vcc;
1267                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1268                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1269 
1270                 vcc->pop = vpriv->old_pop;
1271                 if (vpriv->xoff)
1272                         netif_wake_queue(dev);
1273                 kfree(vpriv);
1274                 vcc->user_back = NULL;
1275                 vcc->push = entry->old_push;
1276                 vcc_release_async(vcc, -EPIPE);
1277                 entry->vcc = NULL;
1278         }
1279         if (entry->recv_vcc) {
1280                 entry->recv_vcc->push = entry->old_recv_push;
1281                 vcc_release_async(entry->recv_vcc, -EPIPE);
1282                 entry->recv_vcc = NULL;
1283         }
1284 }
1285 
1286 /*
1287  * Insert entry to lec_arp_table
1288  * LANE2: Add to the end of the list to satisfy 8.1.13
1289  */
1290 static inline void
1291 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1292 {
1293         struct hlist_head *tmp;
1294 
1295         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1296         hlist_add_head(&entry->next, tmp);
1297 
1298         pr_debug("Added entry:%pM\n", entry->mac_addr);
1299 }
1300 
1301 /*
1302  * Remove entry from lec_arp_table
1303  */
1304 static int
1305 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1306 {
1307         struct lec_arp_table *entry;
1308         int i, remove_vcc = 1;
1309 
1310         if (!to_remove)
1311                 return -1;
1312 
1313         hlist_del(&to_remove->next);
1314         del_timer(&to_remove->timer);
1315 
1316         /*
1317          * If this is the only MAC connected to this VCC,
1318          * also tear down the VCC
1319          */
1320         if (to_remove->status >= ESI_FLUSH_PENDING) {
1321                 /*
1322                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1323                  */
1324                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1325                         hlist_for_each_entry(entry,
1326                                              &priv->lec_arp_tables[i], next) {
1327                                 if (memcmp(to_remove->atm_addr,
1328                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1329                                         remove_vcc = 0;
1330                                         break;
1331                                 }
1332                         }
1333                 }
1334                 if (remove_vcc)
1335                         lec_arp_clear_vccs(to_remove);
1336         }
1337         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1338 
1339         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1340         return 0;
1341 }
1342 
1343 #if DEBUG_ARP_TABLE
1344 static const char *get_status_string(unsigned char st)
1345 {
1346         switch (st) {
1347         case ESI_UNKNOWN:
1348                 return "ESI_UNKNOWN";
1349         case ESI_ARP_PENDING:
1350                 return "ESI_ARP_PENDING";
1351         case ESI_VC_PENDING:
1352                 return "ESI_VC_PENDING";
1353         case ESI_FLUSH_PENDING:
1354                 return "ESI_FLUSH_PENDING";
1355         case ESI_FORWARD_DIRECT:
1356                 return "ESI_FORWARD_DIRECT";
1357         }
1358         return "<UNKNOWN>";
1359 }
1360 
1361 static void dump_arp_table(struct lec_priv *priv)
1362 {
1363         struct lec_arp_table *rulla;
1364         char buf[256];
1365         int i, j, offset;
1366 
1367         pr_info("Dump %p:\n", priv);
1368         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1369                 hlist_for_each_entry(rulla,
1370                                      &priv->lec_arp_tables[i], next) {
1371                         offset = 0;
1372                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1373                         offset += sprintf(buf + offset, "Mac: %pM",
1374                                           rulla->mac_addr);
1375                         offset += sprintf(buf + offset, " Atm:");
1376                         for (j = 0; j < ATM_ESA_LEN; j++) {
1377                                 offset += sprintf(buf + offset,
1378                                                   "%2.2x ",
1379                                                   rulla->atm_addr[j] & 0xff);
1380                         }
1381                         offset += sprintf(buf + offset,
1382                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1383                                           rulla->vcc ? rulla->vcc->vpi : 0,
1384                                           rulla->vcc ? rulla->vcc->vci : 0,
1385                                           rulla->recv_vcc ? rulla->recv_vcc->
1386                                           vpi : 0,
1387                                           rulla->recv_vcc ? rulla->recv_vcc->
1388                                           vci : 0, rulla->last_used,
1389                                           rulla->timestamp, rulla->no_tries);
1390                         offset +=
1391                             sprintf(buf + offset,
1392                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1393                                     rulla->flags, rulla->packets_flooded,
1394                                     get_status_string(rulla->status));
1395                         pr_info("%s\n", buf);
1396                 }
1397         }
1398 
1399         if (!hlist_empty(&priv->lec_no_forward))
1400                 pr_info("No forward\n");
1401         hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1402                 offset = 0;
1403                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1404                 offset += sprintf(buf + offset, " Atm:");
1405                 for (j = 0; j < ATM_ESA_LEN; j++) {
1406                         offset += sprintf(buf + offset, "%2.2x ",
1407                                           rulla->atm_addr[j] & 0xff);
1408                 }
1409                 offset += sprintf(buf + offset,
1410                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1411                                   rulla->vcc ? rulla->vcc->vpi : 0,
1412                                   rulla->vcc ? rulla->vcc->vci : 0,
1413                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1414                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1415                                   rulla->last_used,
1416                                   rulla->timestamp, rulla->no_tries);
1417                 offset += sprintf(buf + offset,
1418                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1419                                   rulla->flags, rulla->packets_flooded,
1420                                   get_status_string(rulla->status));
1421                 pr_info("%s\n", buf);
1422         }
1423 
1424         if (!hlist_empty(&priv->lec_arp_empty_ones))
1425                 pr_info("Empty ones\n");
1426         hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1427                 offset = 0;
1428                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1429                 offset += sprintf(buf + offset, " Atm:");
1430                 for (j = 0; j < ATM_ESA_LEN; j++) {
1431                         offset += sprintf(buf + offset, "%2.2x ",
1432                                           rulla->atm_addr[j] & 0xff);
1433                 }
1434                 offset += sprintf(buf + offset,
1435                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1436                                   rulla->vcc ? rulla->vcc->vpi : 0,
1437                                   rulla->vcc ? rulla->vcc->vci : 0,
1438                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1439                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1440                                   rulla->last_used,
1441                                   rulla->timestamp, rulla->no_tries);
1442                 offset += sprintf(buf + offset,
1443                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1444                                   rulla->flags, rulla->packets_flooded,
1445                                   get_status_string(rulla->status));
1446                 pr_info("%s", buf);
1447         }
1448 
1449         if (!hlist_empty(&priv->mcast_fwds))
1450                 pr_info("Multicast Forward VCCs\n");
1451         hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1452                 offset = 0;
1453                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1454                 offset += sprintf(buf + offset, " Atm:");
1455                 for (j = 0; j < ATM_ESA_LEN; j++) {
1456                         offset += sprintf(buf + offset, "%2.2x ",
1457                                           rulla->atm_addr[j] & 0xff);
1458                 }
1459                 offset += sprintf(buf + offset,
1460                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1461                                   rulla->vcc ? rulla->vcc->vpi : 0,
1462                                   rulla->vcc ? rulla->vcc->vci : 0,
1463                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1464                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1465                                   rulla->last_used,
1466                                   rulla->timestamp, rulla->no_tries);
1467                 offset += sprintf(buf + offset,
1468                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1469                                   rulla->flags, rulla->packets_flooded,
1470                                   get_status_string(rulla->status));
1471                 pr_info("%s\n", buf);
1472         }
1473 
1474 }
1475 #else
1476 #define dump_arp_table(priv) do { } while (0)
1477 #endif
1478 
1479 /*
1480  * Destruction of arp-cache
1481  */
1482 static void lec_arp_destroy(struct lec_priv *priv)
1483 {
1484         unsigned long flags;
1485         struct hlist_node *next;
1486         struct lec_arp_table *entry;
1487         int i;
1488 
1489         cancel_delayed_work_sync(&priv->lec_arp_work);
1490 
1491         /*
1492          * Remove all entries
1493          */
1494 
1495         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1496         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1497                 hlist_for_each_entry_safe(entry, next,
1498                                           &priv->lec_arp_tables[i], next) {
1499                         lec_arp_remove(priv, entry);
1500                         lec_arp_put(entry);
1501                 }
1502                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1503         }
1504 
1505         hlist_for_each_entry_safe(entry, next,
1506                                   &priv->lec_arp_empty_ones, next) {
1507                 del_timer_sync(&entry->timer);
1508                 lec_arp_clear_vccs(entry);
1509                 hlist_del(&entry->next);
1510                 lec_arp_put(entry);
1511         }
1512         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1513 
1514         hlist_for_each_entry_safe(entry, next,
1515                                   &priv->lec_no_forward, next) {
1516                 del_timer_sync(&entry->timer);
1517                 lec_arp_clear_vccs(entry);
1518                 hlist_del(&entry->next);
1519                 lec_arp_put(entry);
1520         }
1521         INIT_HLIST_HEAD(&priv->lec_no_forward);
1522 
1523         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1524                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1525                 lec_arp_clear_vccs(entry);
1526                 hlist_del(&entry->next);
1527                 lec_arp_put(entry);
1528         }
1529         INIT_HLIST_HEAD(&priv->mcast_fwds);
1530         priv->mcast_vcc = NULL;
1531         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1532 }
1533 
1534 /*
1535  * Find entry by mac_address
1536  */
1537 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1538                                           const unsigned char *mac_addr)
1539 {
1540         struct hlist_head *head;
1541         struct lec_arp_table *entry;
1542 
1543         pr_debug("%pM\n", mac_addr);
1544 
1545         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1546         hlist_for_each_entry(entry, head, next) {
1547                 if (ether_addr_equal(mac_addr, entry->mac_addr))
1548                         return entry;
1549         }
1550         return NULL;
1551 }
1552 
1553 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1554                                         const unsigned char *mac_addr)
1555 {
1556         struct lec_arp_table *to_return;
1557 
1558         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1559         if (!to_return) {
1560                 pr_info("LEC: Arp entry kmalloc failed\n");
1561                 return NULL;
1562         }
1563         ether_addr_copy(to_return->mac_addr, mac_addr);
1564         INIT_HLIST_NODE(&to_return->next);
1565         timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1566         to_return->last_used = jiffies;
1567         to_return->priv = priv;
1568         skb_queue_head_init(&to_return->tx_wait);
1569         refcount_set(&to_return->usage, 1);
1570         return to_return;
1571 }
1572 
1573 /* Arp sent timer expired */
1574 static void lec_arp_expire_arp(struct timer_list *t)
1575 {
1576         struct lec_arp_table *entry;
1577 
1578         entry = from_timer(entry, t, timer);
1579 
1580         pr_debug("\n");
1581         if (entry->status == ESI_ARP_PENDING) {
1582                 if (entry->no_tries <= entry->priv->max_retry_count) {
1583                         if (entry->is_rdesc)
1584                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1585                                              entry->mac_addr, NULL, NULL);
1586                         else
1587                                 send_to_lecd(entry->priv, l_arp_xmt,
1588                                              entry->mac_addr, NULL, NULL);
1589                         entry->no_tries++;
1590                 }
1591                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1592         }
1593 }
1594 
1595 /* Unknown/unused vcc expire, remove associated entry */
1596 static void lec_arp_expire_vcc(struct timer_list *t)
1597 {
1598         unsigned long flags;
1599         struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1600         struct lec_priv *priv = to_remove->priv;
1601 
1602         del_timer(&to_remove->timer);
1603 
1604         pr_debug("%p %p: vpi:%d vci:%d\n",
1605                  to_remove, priv,
1606                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1607                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1608 
1609         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1610         hlist_del(&to_remove->next);
1611         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1612 
1613         lec_arp_clear_vccs(to_remove);
1614         lec_arp_put(to_remove);
1615 }
1616 
1617 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1618                                    unsigned long now,
1619                                    struct lec_priv *priv)
1620 {
1621         unsigned long time_to_check;
1622 
1623         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1624                 time_to_check = priv->forward_delay_time;
1625         else
1626                 time_to_check = priv->aging_time;
1627 
1628         pr_debug("About to expire: %lx - %lx > %lx\n",
1629                  now, entry->last_used, time_to_check);
1630         if (time_after(now, entry->last_used + time_to_check) &&
1631             !(entry->flags & LEC_PERMANENT_FLAG) &&
1632             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1633                 /* Remove entry */
1634                 pr_debug("Entry timed out\n");
1635                 lec_arp_remove(priv, entry);
1636                 lec_arp_put(entry);
1637         } else {
1638                 /* Something else */
1639                 if ((entry->status == ESI_VC_PENDING ||
1640                      entry->status == ESI_ARP_PENDING) &&
1641                     time_after_eq(now, entry->timestamp +
1642                                        priv->max_unknown_frame_time)) {
1643                         entry->timestamp = jiffies;
1644                         entry->packets_flooded = 0;
1645                         if (entry->status == ESI_VC_PENDING)
1646                                 send_to_lecd(priv, l_svc_setup,
1647                                              entry->mac_addr,
1648                                              entry->atm_addr,
1649                                              NULL);
1650                 }
1651                 if (entry->status == ESI_FLUSH_PENDING &&
1652                     time_after_eq(now, entry->timestamp +
1653                                        priv->path_switching_delay)) {
1654                         lec_arp_hold(entry);
1655                         return true;
1656                 }
1657         }
1658 
1659         return false;
1660 }
1661 /*
1662  * Expire entries.
1663  * 1. Re-set timer
1664  * 2. For each entry, delete entries that have aged past the age limit.
1665  * 3. For each entry, depending on the status of the entry, perform
1666  *    the following maintenance.
1667  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1668  *       tick_count is above the max_unknown_frame_time, clear
1669  *       the tick_count to zero and clear the packets_flooded counter
1670  *       to zero. This supports the packet rate limit per address
1671  *       while flooding unknowns.
1672  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1673  *       than or equal to the path_switching_delay, change the status
1674  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1675  *       regardless of the progress of the flush protocol.
1676  */
1677 static void lec_arp_check_expire(struct work_struct *work)
1678 {
1679         unsigned long flags;
1680         struct lec_priv *priv =
1681                 container_of(work, struct lec_priv, lec_arp_work.work);
1682         struct hlist_node *next;
1683         struct lec_arp_table *entry;
1684         unsigned long now;
1685         int i;
1686 
1687         pr_debug("%p\n", priv);
1688         now = jiffies;
1689 restart:
1690         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1691         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1692                 hlist_for_each_entry_safe(entry, next,
1693                                           &priv->lec_arp_tables[i], next) {
1694                         if (__lec_arp_check_expire(entry, now, priv)) {
1695                                 struct sk_buff *skb;
1696                                 struct atm_vcc *vcc = entry->vcc;
1697 
1698                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1699                                                        flags);
1700                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1701                                         lec_send(vcc, skb);
1702                                 entry->last_used = jiffies;
1703                                 entry->status = ESI_FORWARD_DIRECT;
1704                                 lec_arp_put(entry);
1705 
1706                                 goto restart;
1707                         }
1708                 }
1709         }
1710         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1711 
1712         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1713 }
1714 
1715 /*
1716  * Try to find vcc where mac_address is attached.
1717  *
1718  */
1719 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1720                                        const unsigned char *mac_to_find,
1721                                        int is_rdesc,
1722                                        struct lec_arp_table **ret_entry)
1723 {
1724         unsigned long flags;
1725         struct lec_arp_table *entry;
1726         struct atm_vcc *found;
1727 
1728         if (mac_to_find[0] & 0x01) {
1729                 switch (priv->lane_version) {
1730                 case 1:
1731                         return priv->mcast_vcc;
1732                 case 2: /* LANE2 wants arp for multicast addresses */
1733                         if (ether_addr_equal(mac_to_find, bus_mac))
1734                                 return priv->mcast_vcc;
1735                         break;
1736                 default:
1737                         break;
1738                 }
1739         }
1740 
1741         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1742         entry = lec_arp_find(priv, mac_to_find);
1743 
1744         if (entry) {
1745                 if (entry->status == ESI_FORWARD_DIRECT) {
1746                         /* Connection Ok */
1747                         entry->last_used = jiffies;
1748                         lec_arp_hold(entry);
1749                         *ret_entry = entry;
1750                         found = entry->vcc;
1751                         goto out;
1752                 }
1753                 /*
1754                  * If the LE_ARP cache entry is still pending, reset count to 0
1755                  * so another LE_ARP request can be made for this frame.
1756                  */
1757                 if (entry->status == ESI_ARP_PENDING)
1758                         entry->no_tries = 0;
1759                 /*
1760                  * Data direct VC not yet set up, check to see if the unknown
1761                  * frame count is greater than the limit. If the limit has
1762                  * not been reached, allow the caller to send packet to
1763                  * BUS.
1764                  */
1765                 if (entry->status != ESI_FLUSH_PENDING &&
1766                     entry->packets_flooded <
1767                     priv->maximum_unknown_frame_count) {
1768                         entry->packets_flooded++;
1769                         pr_debug("Flooding..\n");
1770                         found = priv->mcast_vcc;
1771                         goto out;
1772                 }
1773                 /*
1774                  * We got here because entry->status == ESI_FLUSH_PENDING
1775                  * or BUS flood limit was reached for an entry which is
1776                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1777                  */
1778                 lec_arp_hold(entry);
1779                 *ret_entry = entry;
1780                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1781                          entry->vcc);
1782                 found = NULL;
1783         } else {
1784                 /* No matching entry was found */
1785                 entry = make_entry(priv, mac_to_find);
1786                 pr_debug("Making entry\n");
1787                 if (!entry) {
1788                         found = priv->mcast_vcc;
1789                         goto out;
1790                 }
1791                 lec_arp_add(priv, entry);
1792                 /* We want arp-request(s) to be sent */
1793                 entry->packets_flooded = 1;
1794                 entry->status = ESI_ARP_PENDING;
1795                 entry->no_tries = 1;
1796                 entry->last_used = entry->timestamp = jiffies;
1797                 entry->is_rdesc = is_rdesc;
1798                 if (entry->is_rdesc)
1799                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1800                                      NULL);
1801                 else
1802                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1803                 entry->timer.expires = jiffies + (1 * HZ);
1804                 entry->timer.function = lec_arp_expire_arp;
1805                 add_timer(&entry->timer);
1806                 found = priv->mcast_vcc;
1807         }
1808 
1809 out:
1810         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1811         return found;
1812 }
1813 
1814 static int
1815 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1816                 unsigned long permanent)
1817 {
1818         unsigned long flags;
1819         struct hlist_node *next;
1820         struct lec_arp_table *entry;
1821         int i;
1822 
1823         pr_debug("\n");
1824         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1825         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1826                 hlist_for_each_entry_safe(entry, next,
1827                                           &priv->lec_arp_tables[i], next) {
1828                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1829                             (permanent ||
1830                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1831                                 lec_arp_remove(priv, entry);
1832                                 lec_arp_put(entry);
1833                         }
1834                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1835                         return 0;
1836                 }
1837         }
1838         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1839         return -1;
1840 }
1841 
1842 /*
1843  * Notifies:  Response to arp_request (atm_addr != NULL)
1844  */
1845 static void
1846 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1847                const unsigned char *atm_addr, unsigned long remoteflag,
1848                unsigned int targetless_le_arp)
1849 {
1850         unsigned long flags;
1851         struct hlist_node *next;
1852         struct lec_arp_table *entry, *tmp;
1853         int i;
1854 
1855         pr_debug("%smac:%pM\n",
1856                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1857 
1858         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1859         entry = lec_arp_find(priv, mac_addr);
1860         if (entry == NULL && targetless_le_arp)
1861                 goto out;       /*
1862                                  * LANE2: ignore targetless LE_ARPs for which
1863                                  * we have no entry in the cache. 7.1.30
1864                                  */
1865         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1866                 hlist_for_each_entry_safe(entry, next,
1867                                           &priv->lec_arp_empty_ones, next) {
1868                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1869                                 hlist_del(&entry->next);
1870                                 del_timer(&entry->timer);
1871                                 tmp = lec_arp_find(priv, mac_addr);
1872                                 if (tmp) {
1873                                         del_timer(&tmp->timer);
1874                                         tmp->status = ESI_FORWARD_DIRECT;
1875                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1876                                         tmp->vcc = entry->vcc;
1877                                         tmp->old_push = entry->old_push;
1878                                         tmp->last_used = jiffies;
1879                                         del_timer(&entry->timer);
1880                                         lec_arp_put(entry);
1881                                         entry = tmp;
1882                                 } else {
1883                                         entry->status = ESI_FORWARD_DIRECT;
1884                                         ether_addr_copy(entry->mac_addr,
1885                                                         mac_addr);
1886                                         entry->last_used = jiffies;
1887                                         lec_arp_add(priv, entry);
1888                                 }
1889                                 if (remoteflag)
1890                                         entry->flags |= LEC_REMOTE_FLAG;
1891                                 else
1892                                         entry->flags &= ~LEC_REMOTE_FLAG;
1893                                 pr_debug("After update\n");
1894                                 dump_arp_table(priv);
1895                                 goto out;
1896                         }
1897                 }
1898         }
1899 
1900         entry = lec_arp_find(priv, mac_addr);
1901         if (!entry) {
1902                 entry = make_entry(priv, mac_addr);
1903                 if (!entry)
1904                         goto out;
1905                 entry->status = ESI_UNKNOWN;
1906                 lec_arp_add(priv, entry);
1907                 /* Temporary, changes before end of function */
1908         }
1909         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1910         del_timer(&entry->timer);
1911         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1912                 hlist_for_each_entry(tmp,
1913                                      &priv->lec_arp_tables[i], next) {
1914                         if (entry != tmp &&
1915                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1916                                 /* Vcc to this host exists */
1917                                 if (tmp->status > ESI_VC_PENDING) {
1918                                         /*
1919                                          * ESI_FLUSH_PENDING,
1920                                          * ESI_FORWARD_DIRECT
1921                                          */
1922                                         entry->vcc = tmp->vcc;
1923                                         entry->old_push = tmp->old_push;
1924                                 }
1925                                 entry->status = tmp->status;
1926                                 break;
1927                         }
1928                 }
1929         }
1930         if (remoteflag)
1931                 entry->flags |= LEC_REMOTE_FLAG;
1932         else
1933                 entry->flags &= ~LEC_REMOTE_FLAG;
1934         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1935                 entry->status = ESI_VC_PENDING;
1936                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1937         }
1938         pr_debug("After update2\n");
1939         dump_arp_table(priv);
1940 out:
1941         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1942 }
1943 
1944 /*
1945  * Notifies: Vcc setup ready
1946  */
1947 static void
1948 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1949               struct atm_vcc *vcc,
1950               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1951 {
1952         unsigned long flags;
1953         struct lec_arp_table *entry;
1954         int i, found_entry = 0;
1955 
1956         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1957         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1958         if (ioc_data->receive == 2) {
1959                 pr_debug("LEC_ARP: Attaching mcast forward\n");
1960 #if 0
1961                 entry = lec_arp_find(priv, bus_mac);
1962                 if (!entry) {
1963                         pr_info("LEC_ARP: Multicast entry not found!\n");
1964                         goto out;
1965                 }
1966                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1967                 entry->recv_vcc = vcc;
1968                 entry->old_recv_push = old_push;
1969 #endif
1970                 entry = make_entry(priv, bus_mac);
1971                 if (entry == NULL)
1972                         goto out;
1973                 del_timer(&entry->timer);
1974                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1975                 entry->recv_vcc = vcc;
1976                 entry->old_recv_push = old_push;
1977                 hlist_add_head(&entry->next, &priv->mcast_fwds);
1978                 goto out;
1979         } else if (ioc_data->receive == 1) {
1980                 /*
1981                  * Vcc which we don't want to make default vcc,
1982                  * attach it anyway.
1983                  */
1984                 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",
1985                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1986                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1987                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1988                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1989                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1990                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1991                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1992                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1993                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1994                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1995                 entry = make_entry(priv, bus_mac);
1996                 if (entry == NULL)
1997                         goto out;
1998                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1999                 eth_zero_addr(entry->mac_addr);
2000                 entry->recv_vcc = vcc;
2001                 entry->old_recv_push = old_push;
2002                 entry->status = ESI_UNKNOWN;
2003                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2004                 entry->timer.function = lec_arp_expire_vcc;
2005                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2006                 add_timer(&entry->timer);
2007                 dump_arp_table(priv);
2008                 goto out;
2009         }
2010         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",
2011                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2012                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2013                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2014                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2015                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2016                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2017                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2018                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2019                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2020                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2021         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2022                 hlist_for_each_entry(entry,
2023                                      &priv->lec_arp_tables[i], next) {
2024                         if (memcmp
2025                             (ioc_data->atm_addr, entry->atm_addr,
2026                              ATM_ESA_LEN) == 0) {
2027                                 pr_debug("LEC_ARP: Attaching data direct\n");
2028                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2029                                          entry->vcc ? entry->vcc->vci : 0,
2030                                          entry->recv_vcc ? entry->recv_vcc->
2031                                          vci : 0);
2032                                 found_entry = 1;
2033                                 del_timer(&entry->timer);
2034                                 entry->vcc = vcc;
2035                                 entry->old_push = old_push;
2036                                 if (entry->status == ESI_VC_PENDING) {
2037                                         if (priv->maximum_unknown_frame_count
2038                                             == 0)
2039                                                 entry->status =
2040                                                     ESI_FORWARD_DIRECT;
2041                                         else {
2042                                                 entry->timestamp = jiffies;
2043                                                 entry->status =
2044                                                     ESI_FLUSH_PENDING;
2045 #if 0
2046                                                 send_to_lecd(priv, l_flush_xmt,
2047                                                              NULL,
2048                                                              entry->atm_addr,
2049                                                              NULL);
2050 #endif
2051                                         }
2052                                 } else {
2053                                         /*
2054                                          * They were forming a connection
2055                                          * to us, and we to them. Our
2056                                          * ATM address is numerically lower
2057                                          * than theirs, so we make connection
2058                                          * we formed into default VCC (8.1.11).
2059                                          * Connection they made gets torn
2060                                          * down. This might confuse some
2061                                          * clients. Can be changed if
2062                                          * someone reports trouble...
2063                                          */
2064                                         ;
2065                                 }
2066                         }
2067                 }
2068         }
2069         if (found_entry) {
2070                 pr_debug("After vcc was added\n");
2071                 dump_arp_table(priv);
2072                 goto out;
2073         }
2074         /*
2075          * Not found, snatch address from first data packet that arrives
2076          * from this vcc
2077          */
2078         entry = make_entry(priv, bus_mac);
2079         if (!entry)
2080                 goto out;
2081         entry->vcc = vcc;
2082         entry->old_push = old_push;
2083         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2084         eth_zero_addr(entry->mac_addr);
2085         entry->status = ESI_UNKNOWN;
2086         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2087         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2088         entry->timer.function = lec_arp_expire_vcc;
2089         add_timer(&entry->timer);
2090         pr_debug("After vcc was added\n");
2091         dump_arp_table(priv);
2092 out:
2093         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2094 }
2095 
2096 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2097 {
2098         unsigned long flags;
2099         struct lec_arp_table *entry;
2100         int i;
2101 
2102         pr_debug("%lx\n", tran_id);
2103 restart:
2104         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2105         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2106                 hlist_for_each_entry(entry,
2107                                      &priv->lec_arp_tables[i], next) {
2108                         if (entry->flush_tran_id == tran_id &&
2109                             entry->status == ESI_FLUSH_PENDING) {
2110                                 struct sk_buff *skb;
2111                                 struct atm_vcc *vcc = entry->vcc;
2112 
2113                                 lec_arp_hold(entry);
2114                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2115                                                        flags);
2116                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2117                                         lec_send(vcc, skb);
2118                                 entry->last_used = jiffies;
2119                                 entry->status = ESI_FORWARD_DIRECT;
2120                                 lec_arp_put(entry);
2121                                 pr_debug("LEC_ARP: Flushed\n");
2122                                 goto restart;
2123                         }
2124                 }
2125         }
2126         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2127         dump_arp_table(priv);
2128 }
2129 
2130 static void
2131 lec_set_flush_tran_id(struct lec_priv *priv,
2132                       const unsigned char *atm_addr, unsigned long tran_id)
2133 {
2134         unsigned long flags;
2135         struct lec_arp_table *entry;
2136         int i;
2137 
2138         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2139         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2140                 hlist_for_each_entry(entry,
2141                                      &priv->lec_arp_tables[i], next) {
2142                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2143                                 entry->flush_tran_id = tran_id;
2144                                 pr_debug("Set flush transaction id to %lx for %p\n",
2145                                          tran_id, entry);
2146                         }
2147                 }
2148         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2149 }
2150 
2151 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2152 {
2153         unsigned long flags;
2154         unsigned char mac_addr[] = {
2155                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2156         };
2157         struct lec_arp_table *to_add;
2158         struct lec_vcc_priv *vpriv;
2159         int err = 0;
2160 
2161         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2162         if (!vpriv)
2163                 return -ENOMEM;
2164         vpriv->xoff = 0;
2165         vpriv->old_pop = vcc->pop;
2166         vcc->user_back = vpriv;
2167         vcc->pop = lec_pop;
2168         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2169         to_add = make_entry(priv, mac_addr);
2170         if (!to_add) {
2171                 vcc->pop = vpriv->old_pop;
2172                 kfree(vpriv);
2173                 err = -ENOMEM;
2174                 goto out;
2175         }
2176         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2177         to_add->status = ESI_FORWARD_DIRECT;
2178         to_add->flags |= LEC_PERMANENT_FLAG;
2179         to_add->vcc = vcc;
2180         to_add->old_push = vcc->push;
2181         vcc->push = lec_push;
2182         priv->mcast_vcc = vcc;
2183         lec_arp_add(priv, to_add);
2184 out:
2185         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2186         return err;
2187 }
2188 
2189 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2190 {
2191         unsigned long flags;
2192         struct hlist_node *next;
2193         struct lec_arp_table *entry;
2194         int i;
2195 
2196         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2197         dump_arp_table(priv);
2198 
2199         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2200 
2201         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2202                 hlist_for_each_entry_safe(entry, next,
2203                                           &priv->lec_arp_tables[i], next) {
2204                         if (vcc == entry->vcc) {
2205                                 lec_arp_remove(priv, entry);
2206                                 lec_arp_put(entry);
2207                                 if (priv->mcast_vcc == vcc)
2208                                         priv->mcast_vcc = NULL;
2209                         }
2210                 }
2211         }
2212 
2213         hlist_for_each_entry_safe(entry, next,
2214                                   &priv->lec_arp_empty_ones, next) {
2215                 if (entry->vcc == vcc) {
2216                         lec_arp_clear_vccs(entry);
2217                         del_timer(&entry->timer);
2218                         hlist_del(&entry->next);
2219                         lec_arp_put(entry);
2220                 }
2221         }
2222 
2223         hlist_for_each_entry_safe(entry, next,
2224                                   &priv->lec_no_forward, next) {
2225                 if (entry->recv_vcc == vcc) {
2226                         lec_arp_clear_vccs(entry);
2227                         del_timer(&entry->timer);
2228                         hlist_del(&entry->next);
2229                         lec_arp_put(entry);
2230                 }
2231         }
2232 
2233         hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2234                 if (entry->recv_vcc == vcc) {
2235                         lec_arp_clear_vccs(entry);
2236                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2237                         hlist_del(&entry->next);
2238                         lec_arp_put(entry);
2239                 }
2240         }
2241 
2242         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2243         dump_arp_table(priv);
2244 }
2245 
2246 static void
2247 lec_arp_check_empties(struct lec_priv *priv,
2248                       struct atm_vcc *vcc, struct sk_buff *skb)
2249 {
2250         unsigned long flags;
2251         struct hlist_node *next;
2252         struct lec_arp_table *entry, *tmp;
2253         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2254         unsigned char *src = hdr->h_source;
2255 
2256         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2257         hlist_for_each_entry_safe(entry, next,
2258                                   &priv->lec_arp_empty_ones, next) {
2259                 if (vcc == entry->vcc) {
2260                         del_timer(&entry->timer);
2261                         ether_addr_copy(entry->mac_addr, src);
2262                         entry->status = ESI_FORWARD_DIRECT;
2263                         entry->last_used = jiffies;
2264                         /* We might have got an entry */
2265                         tmp = lec_arp_find(priv, src);
2266                         if (tmp) {
2267                                 lec_arp_remove(priv, tmp);
2268                                 lec_arp_put(tmp);
2269                         }
2270                         hlist_del(&entry->next);
2271                         lec_arp_add(priv, entry);
2272                         goto out;
2273                 }
2274         }
2275         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2276 out:
2277         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2278 }
2279 
2280 MODULE_LICENSE("GPL");
2281 

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