atm: remove a net_device_stats clear
[linux-3.10.git] / net / atm / lec.c
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 /* TokenRing if needed */
30 #ifdef CONFIG_TR
31 #include <linux/trdevice.h>
32 #endif
33
34 /* And atm device */
35 #include <linux/atmdev.h>
36 #include <linux/atmlec.h>
37
38 /* Proxy LEC knows about bridging */
39 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
40 #include "../bridge/br_private.h"
41
42 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
43 #endif
44
45 /* Modular too */
46 #include <linux/module.h>
47 #include <linux/init.h>
48
49 #include "lec.h"
50 #include "lec_arpc.h"
51 #include "resources.h"
52
53 #define DUMP_PACKETS 0          /*
54                                  * 0 = None,
55                                  * 1 = 30 first bytes
56                                  * 2 = Whole packet
57                                  */
58
59 #define LEC_UNRES_QUE_LEN 8     /*
60                                  * number of tx packets to queue for a
61                                  * single destination while waiting for SVC
62                                  */
63
64 static int lec_open(struct net_device *dev);
65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
66                                   struct net_device *dev);
67 static int lec_close(struct net_device *dev);
68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
69                                           const unsigned char *mac_addr);
70 static int lec_arp_remove(struct lec_priv *priv,
71                           struct lec_arp_table *to_remove);
72 /* LANE2 functions */
73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
74                                 const u8 *tlvs, u32 sizeoftlvs);
75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
76                          u8 **tlvs, u32 *sizeoftlvs);
77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
78                                const u8 *tlvs, u32 sizeoftlvs);
79
80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
81                            unsigned long permanent);
82 static void lec_arp_check_empties(struct lec_priv *priv,
83                                   struct atm_vcc *vcc, struct sk_buff *skb);
84 static void lec_arp_destroy(struct lec_priv *priv);
85 static void lec_arp_init(struct lec_priv *priv);
86 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
87                                        const unsigned char *mac_to_find,
88                                        int is_rdesc,
89                                        struct lec_arp_table **ret_entry);
90 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
91                            const unsigned char *atm_addr,
92                            unsigned long remoteflag,
93                            unsigned int targetless_le_arp);
94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
96 static void lec_set_flush_tran_id(struct lec_priv *priv,
97                                   const unsigned char *atm_addr,
98                                   unsigned long tran_id);
99 static void lec_vcc_added(struct lec_priv *priv,
100                           const struct atmlec_ioc *ioc_data,
101                           struct atm_vcc *vcc,
102                           void (*old_push)(struct atm_vcc *vcc,
103                                            struct sk_buff *skb));
104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
105
106 /* must be done under lec_arp_lock */
107 static inline void lec_arp_hold(struct lec_arp_table *entry)
108 {
109         atomic_inc(&entry->usage);
110 }
111
112 static inline void lec_arp_put(struct lec_arp_table *entry)
113 {
114         if (atomic_dec_and_test(&entry->usage))
115                 kfree(entry);
116 }
117
118 static struct lane2_ops lane2_ops = {
119         lane2_resolve,          /* resolve,             spec 3.1.3 */
120         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
121         NULL                    /* associate indicator, spec 3.1.5 */
122 };
123
124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125
126 /* Device structures */
127 static struct net_device *dev_lec[MAX_LEC_ITF];
128
129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132         struct ethhdr *eth;
133         char *buff;
134         struct lec_priv *priv;
135
136         /*
137          * Check if this is a BPDU. If so, ask zeppelin to send
138          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
139          * as the Config BPDU has
140          */
141         eth = (struct ethhdr *)skb->data;
142         buff = skb->data + skb->dev->hard_header_len;
143         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
144                 struct sock *sk;
145                 struct sk_buff *skb2;
146                 struct atmlec_msg *mesg;
147
148                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
149                 if (skb2 == NULL)
150                         return;
151                 skb2->len = sizeof(struct atmlec_msg);
152                 mesg = (struct atmlec_msg *)skb2->data;
153                 mesg->type = l_topology_change;
154                 buff += 4;
155                 mesg->content.normal.flag = *buff & 0x01;
156                                         /* 0x01 is topology change */
157
158                 priv = netdev_priv(dev);
159                 atm_force_charge(priv->lecd, skb2->truesize);
160                 sk = sk_atm(priv->lecd);
161                 skb_queue_tail(&sk->sk_receive_queue, skb2);
162                 sk->sk_data_ready(sk, skb2->len);
163         }
164 }
165 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
166
167 /*
168  * Modelled after tr_type_trans
169  * All multicast and ARE or STE frames go to BUS.
170  * Non source routed frames go by destination address.
171  * Last hop source routed frames go by destination address.
172  * Not last hop source routed frames go by _next_ route descriptor.
173  * Returns pointer to destination MAC address or fills in rdesc
174  * and returns NULL.
175  */
176 #ifdef CONFIG_TR
177 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
178 {
179         struct trh_hdr *trh;
180         unsigned int riflen, num_rdsc;
181
182         trh = (struct trh_hdr *)packet;
183         if (trh->daddr[0] & (uint8_t) 0x80)
184                 return bus_mac; /* multicast */
185
186         if (trh->saddr[0] & TR_RII) {
187                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
188                 if ((ntohs(trh->rcf) >> 13) != 0)
189                         return bus_mac; /* ARE or STE */
190         } else
191                 return trh->daddr;      /* not source routed */
192
193         if (riflen < 6)
194                 return trh->daddr;      /* last hop, source routed */
195
196         /* riflen is 6 or more, packet has more than one route descriptor */
197         num_rdsc = (riflen / 2) - 1;
198         memset(rdesc, 0, ETH_ALEN);
199         /* offset 4 comes from LAN destination field in LE control frames */
200         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
201                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
202         else {
203                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
204                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
205         }
206
207         return NULL;
208 }
209 #endif /* CONFIG_TR */
210
211 /*
212  * Open/initialize the netdevice. This is called (in the current kernel)
213  * sometime after booting when the 'ifconfig' program is run.
214  *
215  * This routine should set everything up anew at each open, even
216  * registers that "should" only need to be set once at boot, so that
217  * there is non-reboot way to recover if something goes wrong.
218  */
219
220 static int lec_open(struct net_device *dev)
221 {
222         netif_start_queue(dev);
223
224         return 0;
225 }
226
227 static void
228 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
229 {
230         struct net_device *dev = skb->dev;
231
232         ATM_SKB(skb)->vcc = vcc;
233         ATM_SKB(skb)->atm_options = vcc->atm_options;
234
235         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
236         if (vcc->send(vcc, skb) < 0) {
237                 dev->stats.tx_dropped++;
238                 return;
239         }
240
241         dev->stats.tx_packets++;
242         dev->stats.tx_bytes += skb->len;
243 }
244
245 static void lec_tx_timeout(struct net_device *dev)
246 {
247         pr_info("%s\n", dev->name);
248         dev->trans_start = jiffies;
249         netif_wake_queue(dev);
250 }
251
252 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
253                                   struct net_device *dev)
254 {
255         struct sk_buff *skb2;
256         struct lec_priv *priv = netdev_priv(dev);
257         struct lecdatahdr_8023 *lec_h;
258         struct atm_vcc *vcc;
259         struct lec_arp_table *entry;
260         unsigned char *dst;
261         int min_frame_size;
262 #ifdef CONFIG_TR
263         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
264 #endif
265         int is_rdesc;
266
267         pr_debug("called\n");
268         if (!priv->lecd) {
269                 pr_info("%s:No lecd attached\n", dev->name);
270                 dev->stats.tx_errors++;
271                 netif_stop_queue(dev);
272                 kfree_skb(skb);
273                 return NETDEV_TX_OK;
274         }
275
276         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
277                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
278                  (long)skb_end_pointer(skb));
279 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
280         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
281                 lec_handle_bridge(skb, dev);
282 #endif
283
284         /* Make sure we have room for lec_id */
285         if (skb_headroom(skb) < 2) {
286                 pr_debug("reallocating skb\n");
287                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
288                 kfree_skb(skb);
289                 if (skb2 == NULL)
290                         return NETDEV_TX_OK;
291                 skb = skb2;
292         }
293         skb_push(skb, 2);
294
295         /* Put le header to place, works for TokenRing too */
296         lec_h = (struct lecdatahdr_8023 *)skb->data;
297         lec_h->le_header = htons(priv->lecid);
298
299 #ifdef CONFIG_TR
300         /*
301          * Ugly. Use this to realign Token Ring packets for
302          * e.g. PCA-200E driver.
303          */
304         if (priv->is_trdev) {
305                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
306                 kfree_skb(skb);
307                 if (skb2 == NULL)
308                         return NETDEV_TX_OK;
309                 skb = skb2;
310         }
311 #endif
312
313 #if DUMP_PACKETS >= 2
314 #define MAX_DUMP_SKB 99
315 #elif DUMP_PACKETS >= 1
316 #define MAX_DUMP_SKB 30
317 #endif
318 #if DUMP_PACKETS >= 1
319         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
320                dev->name, skb->len, priv->lecid);
321         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
322                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
323 #endif /* DUMP_PACKETS >= 1 */
324
325         /* Minimum ethernet-frame size */
326 #ifdef CONFIG_TR
327         if (priv->is_trdev)
328                 min_frame_size = LEC_MINIMUM_8025_SIZE;
329         else
330 #endif
331                 min_frame_size = LEC_MINIMUM_8023_SIZE;
332         if (skb->len < min_frame_size) {
333                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
334                         skb2 = skb_copy_expand(skb, 0,
335                                                min_frame_size - skb->truesize,
336                                                GFP_ATOMIC);
337                         dev_kfree_skb(skb);
338                         if (skb2 == NULL) {
339                                 dev->stats.tx_dropped++;
340                                 return NETDEV_TX_OK;
341                         }
342                         skb = skb2;
343                 }
344                 skb_put(skb, min_frame_size - skb->len);
345         }
346
347         /* Send to right vcc */
348         is_rdesc = 0;
349         dst = lec_h->h_dest;
350 #ifdef CONFIG_TR
351         if (priv->is_trdev) {
352                 dst = get_tr_dst(skb->data + 2, rdesc);
353                 if (dst == NULL) {
354                         dst = rdesc;
355                         is_rdesc = 1;
356                 }
357         }
358 #endif
359         entry = NULL;
360         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
361         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
362                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
363         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
364                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
365                         pr_debug("%s:queuing packet, MAC address %pM\n",
366                                  dev->name, lec_h->h_dest);
367                         skb_queue_tail(&entry->tx_wait, skb);
368                 } else {
369                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
370                                  dev->name, lec_h->h_dest);
371                         dev->stats.tx_dropped++;
372                         dev_kfree_skb(skb);
373                 }
374                 goto out;
375         }
376 #if DUMP_PACKETS > 0
377         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
378                dev->name, vcc->vpi, vcc->vci);
379 #endif /* DUMP_PACKETS > 0 */
380
381         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
382                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
383                 lec_send(vcc, skb2);
384         }
385
386         lec_send(vcc, skb);
387
388         if (!atm_may_send(vcc, 0)) {
389                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
390
391                 vpriv->xoff = 1;
392                 netif_stop_queue(dev);
393
394                 /*
395                  * vcc->pop() might have occurred in between, making
396                  * the vcc usuable again.  Since xmit is serialized,
397                  * this is the only situation we have to re-test.
398                  */
399
400                 if (atm_may_send(vcc, 0))
401                         netif_wake_queue(dev);
402         }
403
404 out:
405         if (entry)
406                 lec_arp_put(entry);
407         dev->trans_start = jiffies;
408         return NETDEV_TX_OK;
409 }
410
411 /* The inverse routine to net_open(). */
412 static int lec_close(struct net_device *dev)
413 {
414         netif_stop_queue(dev);
415         return 0;
416 }
417
418 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
419 {
420         unsigned long flags;
421         struct net_device *dev = (struct net_device *)vcc->proto_data;
422         struct lec_priv *priv = netdev_priv(dev);
423         struct atmlec_msg *mesg;
424         struct lec_arp_table *entry;
425         int i;
426         char *tmp;              /* FIXME */
427
428         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
429         mesg = (struct atmlec_msg *)skb->data;
430         tmp = skb->data;
431         tmp += sizeof(struct atmlec_msg);
432         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
433         switch (mesg->type) {
434         case l_set_mac_addr:
435                 for (i = 0; i < 6; i++)
436                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
437                 break;
438         case l_del_mac_addr:
439                 for (i = 0; i < 6; i++)
440                         dev->dev_addr[i] = 0;
441                 break;
442         case l_addr_delete:
443                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
444                                 mesg->content.normal.flag);
445                 break;
446         case l_topology_change:
447                 priv->topology_change = mesg->content.normal.flag;
448                 break;
449         case l_flush_complete:
450                 lec_flush_complete(priv, mesg->content.normal.flag);
451                 break;
452         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
453                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
454                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
455                 lec_arp_remove(priv, entry);
456                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
457
458                 if (mesg->content.normal.no_source_le_narp)
459                         break;
460                 /* FALL THROUGH */
461         case l_arp_update:
462                 lec_arp_update(priv, mesg->content.normal.mac_addr,
463                                mesg->content.normal.atm_addr,
464                                mesg->content.normal.flag,
465                                mesg->content.normal.targetless_le_arp);
466                 pr_debug("in l_arp_update\n");
467                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
468                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
469                                  mesg->sizeoftlvs);
470                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
471                                             tmp, mesg->sizeoftlvs);
472                 }
473                 break;
474         case l_config:
475                 priv->maximum_unknown_frame_count =
476                     mesg->content.config.maximum_unknown_frame_count;
477                 priv->max_unknown_frame_time =
478                     (mesg->content.config.max_unknown_frame_time * HZ);
479                 priv->max_retry_count = mesg->content.config.max_retry_count;
480                 priv->aging_time = (mesg->content.config.aging_time * HZ);
481                 priv->forward_delay_time =
482                     (mesg->content.config.forward_delay_time * HZ);
483                 priv->arp_response_time =
484                     (mesg->content.config.arp_response_time * HZ);
485                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
486                 priv->path_switching_delay =
487                     (mesg->content.config.path_switching_delay * HZ);
488                 priv->lane_version = mesg->content.config.lane_version;
489                                         /* LANE2 */
490                 priv->lane2_ops = NULL;
491                 if (priv->lane_version > 1)
492                         priv->lane2_ops = &lane2_ops;
493                 if (dev_set_mtu(dev, mesg->content.config.mtu))
494                         pr_info("%s: change_mtu to %d failed\n",
495                                 dev->name, mesg->content.config.mtu);
496                 priv->is_proxy = mesg->content.config.is_proxy;
497                 break;
498         case l_flush_tran_id:
499                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
500                                       mesg->content.normal.flag);
501                 break;
502         case l_set_lecid:
503                 priv->lecid =
504                     (unsigned short)(0xffff & mesg->content.normal.flag);
505                 break;
506         case l_should_bridge:
507 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
508         {
509                 pr_debug("%s: bridge zeppelin asks about %pM\n",
510                          dev->name, mesg->content.proxy.mac_addr);
511
512                 if (br_fdb_test_addr_hook == NULL)
513                         break;
514
515                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
516                         /* hit from bridge table, send LE_ARP_RESPONSE */
517                         struct sk_buff *skb2;
518                         struct sock *sk;
519
520                         pr_debug("%s: entry found, responding to zeppelin\n",
521                                  dev->name);
522                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
523                         if (skb2 == NULL)
524                                 break;
525                         skb2->len = sizeof(struct atmlec_msg);
526                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
527                         atm_force_charge(priv->lecd, skb2->truesize);
528                         sk = sk_atm(priv->lecd);
529                         skb_queue_tail(&sk->sk_receive_queue, skb2);
530                         sk->sk_data_ready(sk, skb2->len);
531                 }
532         }
533 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
534                 break;
535         default:
536                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
537                 dev_kfree_skb(skb);
538                 return -EINVAL;
539         }
540         dev_kfree_skb(skb);
541         return 0;
542 }
543
544 static void lec_atm_close(struct atm_vcc *vcc)
545 {
546         struct sk_buff *skb;
547         struct net_device *dev = (struct net_device *)vcc->proto_data;
548         struct lec_priv *priv = netdev_priv(dev);
549
550         priv->lecd = NULL;
551         /* Do something needful? */
552
553         netif_stop_queue(dev);
554         lec_arp_destroy(priv);
555
556         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
557                 pr_info("%s closing with messages pending\n", dev->name);
558         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
559                 atm_return(vcc, skb->truesize);
560                 dev_kfree_skb(skb);
561         }
562
563         pr_info("%s: Shut down!\n", dev->name);
564         module_put(THIS_MODULE);
565 }
566
567 static struct atmdev_ops lecdev_ops = {
568         .close = lec_atm_close,
569         .send = lec_atm_send
570 };
571
572 static struct atm_dev lecatm_dev = {
573         .ops = &lecdev_ops,
574         .type = "lec",
575         .number = 999,          /* dummy device number */
576         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
577 };
578
579 /*
580  * LANE2: new argument struct sk_buff *data contains
581  * the LE_ARP based TLVs introduced in the LANE2 spec
582  */
583 static int
584 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
585              const unsigned char *mac_addr, const unsigned char *atm_addr,
586              struct sk_buff *data)
587 {
588         struct sock *sk;
589         struct sk_buff *skb;
590         struct atmlec_msg *mesg;
591
592         if (!priv || !priv->lecd)
593                 return -1;
594         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
595         if (!skb)
596                 return -1;
597         skb->len = sizeof(struct atmlec_msg);
598         mesg = (struct atmlec_msg *)skb->data;
599         memset(mesg, 0, sizeof(struct atmlec_msg));
600         mesg->type = type;
601         if (data != NULL)
602                 mesg->sizeoftlvs = data->len;
603         if (mac_addr)
604                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
605         else
606                 mesg->content.normal.targetless_le_arp = 1;
607         if (atm_addr)
608                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
609
610         atm_force_charge(priv->lecd, skb->truesize);
611         sk = sk_atm(priv->lecd);
612         skb_queue_tail(&sk->sk_receive_queue, skb);
613         sk->sk_data_ready(sk, skb->len);
614
615         if (data != NULL) {
616                 pr_debug("about to send %d bytes of data\n", data->len);
617                 atm_force_charge(priv->lecd, data->truesize);
618                 skb_queue_tail(&sk->sk_receive_queue, data);
619                 sk->sk_data_ready(sk, skb->len);
620         }
621
622         return 0;
623 }
624
625 /* shamelessly stolen from drivers/net/net_init.c */
626 static int lec_change_mtu(struct net_device *dev, int new_mtu)
627 {
628         if ((new_mtu < 68) || (new_mtu > 18190))
629                 return -EINVAL;
630         dev->mtu = new_mtu;
631         return 0;
632 }
633
634 static void lec_set_multicast_list(struct net_device *dev)
635 {
636         /*
637          * by default, all multicast frames arrive over the bus.
638          * eventually support selective multicast service
639          */
640 }
641
642 static const struct net_device_ops lec_netdev_ops = {
643         .ndo_open               = lec_open,
644         .ndo_stop               = lec_close,
645         .ndo_start_xmit         = lec_start_xmit,
646         .ndo_change_mtu         = lec_change_mtu,
647         .ndo_tx_timeout         = lec_tx_timeout,
648         .ndo_set_multicast_list = lec_set_multicast_list,
649 };
650
651 static const unsigned char lec_ctrl_magic[] = {
652         0xff,
653         0x00,
654         0x01,
655         0x01
656 };
657
658 #define LEC_DATA_DIRECT_8023  2
659 #define LEC_DATA_DIRECT_8025  3
660
661 static int lec_is_data_direct(struct atm_vcc *vcc)
662 {
663         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
664                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
665 }
666
667 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
668 {
669         unsigned long flags;
670         struct net_device *dev = (struct net_device *)vcc->proto_data;
671         struct lec_priv *priv = netdev_priv(dev);
672
673 #if DUMP_PACKETS > 0
674         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
675                dev->name, vcc->vpi, vcc->vci);
676 #endif
677         if (!skb) {
678                 pr_debug("%s: null skb\n", dev->name);
679                 lec_vcc_close(priv, vcc);
680                 return;
681         }
682 #if DUMP_PACKETS >= 2
683 #define MAX_SKB_DUMP 99
684 #elif DUMP_PACKETS >= 1
685 #define MAX_SKB_DUMP 30
686 #endif
687 #if DUMP_PACKETS > 0
688         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
689                dev->name, skb->len, priv->lecid);
690         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
691                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
692 #endif /* DUMP_PACKETS > 0 */
693         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
694                                 /* Control frame, to daemon */
695                 struct sock *sk = sk_atm(vcc);
696
697                 pr_debug("%s: To daemon\n", dev->name);
698                 skb_queue_tail(&sk->sk_receive_queue, skb);
699                 sk->sk_data_ready(sk, skb->len);
700         } else {                /* Data frame, queue to protocol handlers */
701                 struct lec_arp_table *entry;
702                 unsigned char *src, *dst;
703
704                 atm_return(vcc, skb->truesize);
705                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
706                     !priv->lecd || !(dev->flags & IFF_UP)) {
707                         /*
708                          * Probably looping back, or if lecd is missing,
709                          * lecd has gone down
710                          */
711                         pr_debug("Ignoring frame...\n");
712                         dev_kfree_skb(skb);
713                         return;
714                 }
715 #ifdef CONFIG_TR
716                 if (priv->is_trdev)
717                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
718                 else
719 #endif
720                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
721
722                 /*
723                  * If this is a Data Direct VCC, and the VCC does not match
724                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
725                  */
726                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
727                 if (lec_is_data_direct(vcc)) {
728 #ifdef CONFIG_TR
729                         if (priv->is_trdev)
730                                 src =
731                                     ((struct lecdatahdr_8025 *)skb->data)->
732                                     h_source;
733                         else
734 #endif
735                                 src =
736                                     ((struct lecdatahdr_8023 *)skb->data)->
737                                     h_source;
738                         entry = lec_arp_find(priv, src);
739                         if (entry && entry->vcc != vcc) {
740                                 lec_arp_remove(priv, entry);
741                                 lec_arp_put(entry);
742                         }
743                 }
744                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
745
746                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
747                     !priv->is_proxy &&  /* Proxy wants all the packets */
748                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
749                         dev_kfree_skb(skb);
750                         return;
751                 }
752                 if (!hlist_empty(&priv->lec_arp_empty_ones))
753                         lec_arp_check_empties(priv, vcc, skb);
754                 skb_pull(skb, 2);       /* skip lec_id */
755 #ifdef CONFIG_TR
756                 if (priv->is_trdev)
757                         skb->protocol = tr_type_trans(skb, dev);
758                 else
759 #endif
760                         skb->protocol = eth_type_trans(skb, dev);
761                 dev->stats.rx_packets++;
762                 dev->stats.rx_bytes += skb->len;
763                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
764                 netif_rx(skb);
765         }
766 }
767
768 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
769 {
770         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
771         struct net_device *dev = skb->dev;
772
773         if (vpriv == NULL) {
774                 pr_info("vpriv = NULL!?!?!?\n");
775                 return;
776         }
777
778         vpriv->old_pop(vcc, skb);
779
780         if (vpriv->xoff && atm_may_send(vcc, 0)) {
781                 vpriv->xoff = 0;
782                 if (netif_running(dev) && netif_queue_stopped(dev))
783                         netif_wake_queue(dev);
784         }
785 }
786
787 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
788 {
789         struct lec_vcc_priv *vpriv;
790         int bytes_left;
791         struct atmlec_ioc ioc_data;
792
793         /* Lecd must be up in this case */
794         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
795         if (bytes_left != 0)
796                 pr_info("copy from user failed for %d bytes\n", bytes_left);
797         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
798             !dev_lec[ioc_data.dev_num])
799                 return -EINVAL;
800         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
801         if (!vpriv)
802                 return -ENOMEM;
803         vpriv->xoff = 0;
804         vpriv->old_pop = vcc->pop;
805         vcc->user_back = vpriv;
806         vcc->pop = lec_pop;
807         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
808                       &ioc_data, vcc, vcc->push);
809         vcc->proto_data = dev_lec[ioc_data.dev_num];
810         vcc->push = lec_push;
811         return 0;
812 }
813
814 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
815 {
816         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
817                 return -EINVAL;
818         vcc->proto_data = dev_lec[arg];
819         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
820                                 vcc);
821 }
822
823 /* Initialize device. */
824 static int lecd_attach(struct atm_vcc *vcc, int arg)
825 {
826         int i;
827         struct lec_priv *priv;
828
829         if (arg < 0)
830                 i = 0;
831         else
832                 i = arg;
833 #ifdef CONFIG_TR
834         if (arg >= MAX_LEC_ITF)
835                 return -EINVAL;
836 #else                           /* Reserve the top NUM_TR_DEVS for TR */
837         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
838                 return -EINVAL;
839 #endif
840         if (!dev_lec[i]) {
841                 int is_trdev, size;
842
843                 is_trdev = 0;
844                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
845                         is_trdev = 1;
846
847                 size = sizeof(struct lec_priv);
848 #ifdef CONFIG_TR
849                 if (is_trdev)
850                         dev_lec[i] = alloc_trdev(size);
851                 else
852 #endif
853                         dev_lec[i] = alloc_etherdev(size);
854                 if (!dev_lec[i])
855                         return -ENOMEM;
856                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
857                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
858                 if (register_netdev(dev_lec[i])) {
859                         free_netdev(dev_lec[i]);
860                         return -EINVAL;
861                 }
862
863                 priv = netdev_priv(dev_lec[i]);
864                 priv->is_trdev = is_trdev;
865         } else {
866                 priv = netdev_priv(dev_lec[i]);
867                 if (priv->lecd)
868                         return -EADDRINUSE;
869         }
870         lec_arp_init(priv);
871         priv->itfnum = i;       /* LANE2 addition */
872         priv->lecd = vcc;
873         vcc->dev = &lecatm_dev;
874         vcc_insert_socket(sk_atm(vcc));
875
876         vcc->proto_data = dev_lec[i];
877         set_bit(ATM_VF_META, &vcc->flags);
878         set_bit(ATM_VF_READY, &vcc->flags);
879
880         /* Set default values to these variables */
881         priv->maximum_unknown_frame_count = 1;
882         priv->max_unknown_frame_time = (1 * HZ);
883         priv->vcc_timeout_period = (1200 * HZ);
884         priv->max_retry_count = 1;
885         priv->aging_time = (300 * HZ);
886         priv->forward_delay_time = (15 * HZ);
887         priv->topology_change = 0;
888         priv->arp_response_time = (1 * HZ);
889         priv->flush_timeout = (4 * HZ);
890         priv->path_switching_delay = (6 * HZ);
891
892         if (dev_lec[i]->flags & IFF_UP)
893                 netif_start_queue(dev_lec[i]);
894         __module_get(THIS_MODULE);
895         return i;
896 }
897
898 #ifdef CONFIG_PROC_FS
899 static const char *lec_arp_get_status_string(unsigned char status)
900 {
901         static const char *const lec_arp_status_string[] = {
902                 "ESI_UNKNOWN       ",
903                 "ESI_ARP_PENDING   ",
904                 "ESI_VC_PENDING    ",
905                 "<Undefined>       ",
906                 "ESI_FLUSH_PENDING ",
907                 "ESI_FORWARD_DIRECT"
908         };
909
910         if (status > ESI_FORWARD_DIRECT)
911                 status = 3;     /* ESI_UNDEFINED */
912         return lec_arp_status_string[status];
913 }
914
915 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
916 {
917         int i;
918
919         for (i = 0; i < ETH_ALEN; i++)
920                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
921         seq_printf(seq, " ");
922         for (i = 0; i < ATM_ESA_LEN; i++)
923                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
924         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
925                    entry->flags & 0xffff);
926         if (entry->vcc)
927                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
928         else
929                 seq_printf(seq, "        ");
930         if (entry->recv_vcc) {
931                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
932                            entry->recv_vcc->vci);
933         }
934         seq_putc(seq, '\n');
935 }
936
937 struct lec_state {
938         unsigned long flags;
939         struct lec_priv *locked;
940         struct hlist_node *node;
941         struct net_device *dev;
942         int itf;
943         int arp_table;
944         int misc_table;
945 };
946
947 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
948                           loff_t *l)
949 {
950         struct hlist_node *e = state->node;
951         struct lec_arp_table *tmp;
952
953         if (!e)
954                 e = tbl->first;
955         if (e == SEQ_START_TOKEN) {
956                 e = tbl->first;
957                 --*l;
958         }
959
960         hlist_for_each_entry_from(tmp, e, next) {
961                 if (--*l < 0)
962                         break;
963         }
964         state->node = e;
965
966         return (*l < 0) ? state : NULL;
967 }
968
969 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
970                           struct lec_priv *priv)
971 {
972         void *v = NULL;
973         int p;
974
975         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
976                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
977                 if (v)
978                         break;
979         }
980         state->arp_table = p;
981         return v;
982 }
983
984 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
985                            struct lec_priv *priv)
986 {
987         struct hlist_head *lec_misc_tables[] = {
988                 &priv->lec_arp_empty_ones,
989                 &priv->lec_no_forward,
990                 &priv->mcast_fwds
991         };
992         void *v = NULL;
993         int q;
994
995         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
996                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
997                 if (v)
998                         break;
999         }
1000         state->misc_table = q;
1001         return v;
1002 }
1003
1004 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1005                            struct lec_priv *priv)
1006 {
1007         if (!state->locked) {
1008                 state->locked = priv;
1009                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1010         }
1011         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1012                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1013                 state->locked = NULL;
1014                 /* Partial state reset for the next time we get called */
1015                 state->arp_table = state->misc_table = 0;
1016         }
1017         return state->locked;
1018 }
1019
1020 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1021 {
1022         struct net_device *dev;
1023         void *v;
1024
1025         dev = state->dev ? state->dev : dev_lec[state->itf];
1026         v = (dev && netdev_priv(dev)) ?
1027                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1028         if (!v && dev) {
1029                 dev_put(dev);
1030                 /* Partial state reset for the next time we get called */
1031                 dev = NULL;
1032         }
1033         state->dev = dev;
1034         return v;
1035 }
1036
1037 static void *lec_get_idx(struct lec_state *state, loff_t l)
1038 {
1039         void *v = NULL;
1040
1041         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1042                 v = lec_itf_walk(state, &l);
1043                 if (v)
1044                         break;
1045         }
1046         return v;
1047 }
1048
1049 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1050 {
1051         struct lec_state *state = seq->private;
1052
1053         state->itf = 0;
1054         state->dev = NULL;
1055         state->locked = NULL;
1056         state->arp_table = 0;
1057         state->misc_table = 0;
1058         state->node = SEQ_START_TOKEN;
1059
1060         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1061 }
1062
1063 static void lec_seq_stop(struct seq_file *seq, void *v)
1064 {
1065         struct lec_state *state = seq->private;
1066
1067         if (state->dev) {
1068                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1069                                        state->flags);
1070                 dev_put(state->dev);
1071         }
1072 }
1073
1074 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1075 {
1076         struct lec_state *state = seq->private;
1077
1078         v = lec_get_idx(state, 1);
1079         *pos += !!PTR_ERR(v);
1080         return v;
1081 }
1082
1083 static int lec_seq_show(struct seq_file *seq, void *v)
1084 {
1085         static const char lec_banner[] =
1086             "Itf  MAC          ATM destination"
1087             "                          Status            Flags "
1088             "VPI/VCI Recv VPI/VCI\n";
1089
1090         if (v == SEQ_START_TOKEN)
1091                 seq_puts(seq, lec_banner);
1092         else {
1093                 struct lec_state *state = seq->private;
1094                 struct net_device *dev = state->dev;
1095                 struct lec_arp_table *entry = hlist_entry(state->node,
1096                                                           struct lec_arp_table,
1097                                                           next);
1098
1099                 seq_printf(seq, "%s ", dev->name);
1100                 lec_info(seq, entry);
1101         }
1102         return 0;
1103 }
1104
1105 static const struct seq_operations lec_seq_ops = {
1106         .start = lec_seq_start,
1107         .next = lec_seq_next,
1108         .stop = lec_seq_stop,
1109         .show = lec_seq_show,
1110 };
1111
1112 static int lec_seq_open(struct inode *inode, struct file *file)
1113 {
1114         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1115 }
1116
1117 static const struct file_operations lec_seq_fops = {
1118         .owner = THIS_MODULE,
1119         .open = lec_seq_open,
1120         .read = seq_read,
1121         .llseek = seq_lseek,
1122         .release = seq_release_private,
1123 };
1124 #endif
1125
1126 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1127 {
1128         struct atm_vcc *vcc = ATM_SD(sock);
1129         int err = 0;
1130
1131         switch (cmd) {
1132         case ATMLEC_CTRL:
1133         case ATMLEC_MCAST:
1134         case ATMLEC_DATA:
1135                 if (!capable(CAP_NET_ADMIN))
1136                         return -EPERM;
1137                 break;
1138         default:
1139                 return -ENOIOCTLCMD;
1140         }
1141
1142         switch (cmd) {
1143         case ATMLEC_CTRL:
1144                 err = lecd_attach(vcc, (int)arg);
1145                 if (err >= 0)
1146                         sock->state = SS_CONNECTED;
1147                 break;
1148         case ATMLEC_MCAST:
1149                 err = lec_mcast_attach(vcc, (int)arg);
1150                 break;
1151         case ATMLEC_DATA:
1152                 err = lec_vcc_attach(vcc, (void __user *)arg);
1153                 break;
1154         }
1155
1156         return err;
1157 }
1158
1159 static struct atm_ioctl lane_ioctl_ops = {
1160         .owner = THIS_MODULE,
1161         .ioctl = lane_ioctl,
1162 };
1163
1164 static int __init lane_module_init(void)
1165 {
1166 #ifdef CONFIG_PROC_FS
1167         struct proc_dir_entry *p;
1168
1169         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1170         if (!p) {
1171                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1172                 return -ENOMEM;
1173         }
1174 #endif
1175
1176         register_atm_ioctl(&lane_ioctl_ops);
1177         pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1178         return 0;
1179 }
1180
1181 static void __exit lane_module_cleanup(void)
1182 {
1183         int i;
1184         struct lec_priv *priv;
1185
1186         remove_proc_entry("lec", atm_proc_root);
1187
1188         deregister_atm_ioctl(&lane_ioctl_ops);
1189
1190         for (i = 0; i < MAX_LEC_ITF; i++) {
1191                 if (dev_lec[i] != NULL) {
1192                         priv = netdev_priv(dev_lec[i]);
1193                         unregister_netdev(dev_lec[i]);
1194                         free_netdev(dev_lec[i]);
1195                         dev_lec[i] = NULL;
1196                 }
1197         }
1198 }
1199
1200 module_init(lane_module_init);
1201 module_exit(lane_module_cleanup);
1202
1203 /*
1204  * LANE2: 3.1.3, LE_RESOLVE.request
1205  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1206  * If sizeoftlvs == NULL the default TLVs associated with with this
1207  * lec will be used.
1208  * If dst_mac == NULL, targetless LE_ARP will be sent
1209  */
1210 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1211                          u8 **tlvs, u32 *sizeoftlvs)
1212 {
1213         unsigned long flags;
1214         struct lec_priv *priv = netdev_priv(dev);
1215         struct lec_arp_table *table;
1216         struct sk_buff *skb;
1217         int retval;
1218
1219         if (force == 0) {
1220                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1221                 table = lec_arp_find(priv, dst_mac);
1222                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1223                 if (table == NULL)
1224                         return -1;
1225
1226                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1227                 if (*tlvs == NULL)
1228                         return -1;
1229
1230                 *sizeoftlvs = table->sizeoftlvs;
1231
1232                 return 0;
1233         }
1234
1235         if (sizeoftlvs == NULL)
1236                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1237
1238         else {
1239                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1240                 if (skb == NULL)
1241                         return -1;
1242                 skb->len = *sizeoftlvs;
1243                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1244                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1245         }
1246         return retval;
1247 }
1248
1249 /*
1250  * LANE2: 3.1.4, LE_ASSOCIATE.request
1251  * Associate the *tlvs with the *lan_dst address.
1252  * Will overwrite any previous association
1253  * Returns 1 for success, 0 for failure (out of memory)
1254  *
1255  */
1256 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1257                                const u8 *tlvs, u32 sizeoftlvs)
1258 {
1259         int retval;
1260         struct sk_buff *skb;
1261         struct lec_priv *priv = netdev_priv(dev);
1262
1263         if (compare_ether_addr(lan_dst, dev->dev_addr))
1264                 return 0;       /* not our mac address */
1265
1266         kfree(priv->tlvs);      /* NULL if there was no previous association */
1267
1268         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1269         if (priv->tlvs == NULL)
1270                 return 0;
1271         priv->sizeoftlvs = sizeoftlvs;
1272
1273         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1274         if (skb == NULL)
1275                 return 0;
1276         skb->len = sizeoftlvs;
1277         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1278         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1279         if (retval != 0)
1280                 pr_info("lec.c: lane2_associate_req() failed\n");
1281         /*
1282          * If the previous association has changed we must
1283          * somehow notify other LANE entities about the change
1284          */
1285         return 1;
1286 }
1287
1288 /*
1289  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1290  *
1291  */
1292 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1293                                 const u8 *tlvs, u32 sizeoftlvs)
1294 {
1295 #if 0
1296         int i = 0;
1297 #endif
1298         struct lec_priv *priv = netdev_priv(dev);
1299 #if 0                           /*
1300                                  * Why have the TLVs in LE_ARP entries
1301                                  * since we do not use them? When you
1302                                  * uncomment this code, make sure the
1303                                  * TLVs get freed when entry is killed
1304                                  */
1305         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1306
1307         if (entry == NULL)
1308                 return;         /* should not happen */
1309
1310         kfree(entry->tlvs);
1311
1312         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1313         if (entry->tlvs == NULL)
1314                 return;
1315         entry->sizeoftlvs = sizeoftlvs;
1316 #endif
1317 #if 0
1318         pr_info("\n");
1319         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1320         while (i < sizeoftlvs)
1321                 pr_cont("%02x ", tlvs[i++]);
1322
1323         pr_cont("\n");
1324 #endif
1325
1326         /* tell MPOA about the TLVs we saw */
1327         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1328                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1329                                                      tlvs, sizeoftlvs);
1330         }
1331 }
1332
1333 /*
1334  * Here starts what used to lec_arpc.c
1335  *
1336  * lec_arpc.c was added here when making
1337  * lane client modular. October 1997
1338  */
1339
1340 #include <linux/types.h>
1341 #include <linux/timer.h>
1342 #include <linux/param.h>
1343 #include <asm/atomic.h>
1344 #include <linux/inetdevice.h>
1345 #include <net/route.h>
1346
1347 #if 0
1348 #define pr_debug(format, args...)
1349 /*
1350   #define pr_debug printk
1351 */
1352 #endif
1353 #define DEBUG_ARP_TABLE 0
1354
1355 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1356
1357 static void lec_arp_check_expire(struct work_struct *work);
1358 static void lec_arp_expire_arp(unsigned long data);
1359
1360 /*
1361  * Arp table funcs
1362  */
1363
1364 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1365
1366 /*
1367  * Initialization of arp-cache
1368  */
1369 static void lec_arp_init(struct lec_priv *priv)
1370 {
1371         unsigned short i;
1372
1373         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1374                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1375         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1376         INIT_HLIST_HEAD(&priv->lec_no_forward);
1377         INIT_HLIST_HEAD(&priv->mcast_fwds);
1378         spin_lock_init(&priv->lec_arp_lock);
1379         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1380         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1381 }
1382
1383 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1384 {
1385         if (entry->vcc) {
1386                 struct atm_vcc *vcc = entry->vcc;
1387                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1388                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1389
1390                 vcc->pop = vpriv->old_pop;
1391                 if (vpriv->xoff)
1392                         netif_wake_queue(dev);
1393                 kfree(vpriv);
1394                 vcc->user_back = NULL;
1395                 vcc->push = entry->old_push;
1396                 vcc_release_async(vcc, -EPIPE);
1397                 entry->vcc = NULL;
1398         }
1399         if (entry->recv_vcc) {
1400                 entry->recv_vcc->push = entry->old_recv_push;
1401                 vcc_release_async(entry->recv_vcc, -EPIPE);
1402                 entry->recv_vcc = NULL;
1403         }
1404 }
1405
1406 /*
1407  * Insert entry to lec_arp_table
1408  * LANE2: Add to the end of the list to satisfy 8.1.13
1409  */
1410 static inline void
1411 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1412 {
1413         struct hlist_head *tmp;
1414
1415         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1416         hlist_add_head(&entry->next, tmp);
1417
1418         pr_debug("Added entry:%pM\n", entry->mac_addr);
1419 }
1420
1421 /*
1422  * Remove entry from lec_arp_table
1423  */
1424 static int
1425 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1426 {
1427         struct hlist_node *node;
1428         struct lec_arp_table *entry;
1429         int i, remove_vcc = 1;
1430
1431         if (!to_remove)
1432                 return -1;
1433
1434         hlist_del(&to_remove->next);
1435         del_timer(&to_remove->timer);
1436
1437         /*
1438          * If this is the only MAC connected to this VCC,
1439          * also tear down the VCC
1440          */
1441         if (to_remove->status >= ESI_FLUSH_PENDING) {
1442                 /*
1443                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1444                  */
1445                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1446                         hlist_for_each_entry(entry, node,
1447                                              &priv->lec_arp_tables[i], next) {
1448                                 if (memcmp(to_remove->atm_addr,
1449                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1450                                         remove_vcc = 0;
1451                                         break;
1452                                 }
1453                         }
1454                 }
1455                 if (remove_vcc)
1456                         lec_arp_clear_vccs(to_remove);
1457         }
1458         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1459
1460         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1461         return 0;
1462 }
1463
1464 #if DEBUG_ARP_TABLE
1465 static const char *get_status_string(unsigned char st)
1466 {
1467         switch (st) {
1468         case ESI_UNKNOWN:
1469                 return "ESI_UNKNOWN";
1470         case ESI_ARP_PENDING:
1471                 return "ESI_ARP_PENDING";
1472         case ESI_VC_PENDING:
1473                 return "ESI_VC_PENDING";
1474         case ESI_FLUSH_PENDING:
1475                 return "ESI_FLUSH_PENDING";
1476         case ESI_FORWARD_DIRECT:
1477                 return "ESI_FORWARD_DIRECT";
1478         }
1479         return "<UNKNOWN>";
1480 }
1481
1482 static void dump_arp_table(struct lec_priv *priv)
1483 {
1484         struct hlist_node *node;
1485         struct lec_arp_table *rulla;
1486         char buf[256];
1487         int i, j, offset;
1488
1489         pr_info("Dump %p:\n", priv);
1490         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1491                 hlist_for_each_entry(rulla, node,
1492                                      &priv->lec_arp_tables[i], next) {
1493                         offset = 0;
1494                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1495                         offset += sprintf(buf + offset, "Mac: %pM",
1496                                           rulla->mac_addr);
1497                         offset += sprintf(buf + offset, " Atm:");
1498                         for (j = 0; j < ATM_ESA_LEN; j++) {
1499                                 offset += sprintf(buf + offset,
1500                                                   "%2.2x ",
1501                                                   rulla->atm_addr[j] & 0xff);
1502                         }
1503                         offset += sprintf(buf + offset,
1504                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1505                                           rulla->vcc ? rulla->vcc->vpi : 0,
1506                                           rulla->vcc ? rulla->vcc->vci : 0,
1507                                           rulla->recv_vcc ? rulla->recv_vcc->
1508                                           vpi : 0,
1509                                           rulla->recv_vcc ? rulla->recv_vcc->
1510                                           vci : 0, rulla->last_used,
1511                                           rulla->timestamp, rulla->no_tries);
1512                         offset +=
1513                             sprintf(buf + offset,
1514                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1515                                     rulla->flags, rulla->packets_flooded,
1516                                     get_status_string(rulla->status));
1517                         pr_info("%s\n", buf);
1518                 }
1519         }
1520
1521         if (!hlist_empty(&priv->lec_no_forward))
1522                 pr_info("No forward\n");
1523         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1524                 offset = 0;
1525                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1526                 offset += sprintf(buf + offset, " Atm:");
1527                 for (j = 0; j < ATM_ESA_LEN; j++) {
1528                         offset += sprintf(buf + offset, "%2.2x ",
1529                                           rulla->atm_addr[j] & 0xff);
1530                 }
1531                 offset += sprintf(buf + offset,
1532                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1533                                   rulla->vcc ? rulla->vcc->vpi : 0,
1534                                   rulla->vcc ? rulla->vcc->vci : 0,
1535                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1536                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1537                                   rulla->last_used,
1538                                   rulla->timestamp, rulla->no_tries);
1539                 offset += sprintf(buf + offset,
1540                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1541                                   rulla->flags, rulla->packets_flooded,
1542                                   get_status_string(rulla->status));
1543                 pr_info("%s\n", buf);
1544         }
1545
1546         if (!hlist_empty(&priv->lec_arp_empty_ones))
1547                 pr_info("Empty ones\n");
1548         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1549                 offset = 0;
1550                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1551                 offset += sprintf(buf + offset, " Atm:");
1552                 for (j = 0; j < ATM_ESA_LEN; j++) {
1553                         offset += sprintf(buf + offset, "%2.2x ",
1554                                           rulla->atm_addr[j] & 0xff);
1555                 }
1556                 offset += sprintf(buf + offset,
1557                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1558                                   rulla->vcc ? rulla->vcc->vpi : 0,
1559                                   rulla->vcc ? rulla->vcc->vci : 0,
1560                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1561                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1562                                   rulla->last_used,
1563                                   rulla->timestamp, rulla->no_tries);
1564                 offset += sprintf(buf + offset,
1565                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1566                                   rulla->flags, rulla->packets_flooded,
1567                                   get_status_string(rulla->status));
1568                 pr_info("%s", buf);
1569         }
1570
1571         if (!hlist_empty(&priv->mcast_fwds))
1572                 pr_info("Multicast Forward VCCs\n");
1573         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1574                 offset = 0;
1575                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1576                 offset += sprintf(buf + offset, " Atm:");
1577                 for (j = 0; j < ATM_ESA_LEN; j++) {
1578                         offset += sprintf(buf + offset, "%2.2x ",
1579                                           rulla->atm_addr[j] & 0xff);
1580                 }
1581                 offset += sprintf(buf + offset,
1582                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1583                                   rulla->vcc ? rulla->vcc->vpi : 0,
1584                                   rulla->vcc ? rulla->vcc->vci : 0,
1585                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1586                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1587                                   rulla->last_used,
1588                                   rulla->timestamp, rulla->no_tries);
1589                 offset += sprintf(buf + offset,
1590                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1591                                   rulla->flags, rulla->packets_flooded,
1592                                   get_status_string(rulla->status));
1593                 pr_info("%s\n", buf);
1594         }
1595
1596 }
1597 #else
1598 #define dump_arp_table(priv) do { } while (0)
1599 #endif
1600
1601 /*
1602  * Destruction of arp-cache
1603  */
1604 static void lec_arp_destroy(struct lec_priv *priv)
1605 {
1606         unsigned long flags;
1607         struct hlist_node *node, *next;
1608         struct lec_arp_table *entry;
1609         int i;
1610
1611         cancel_rearming_delayed_work(&priv->lec_arp_work);
1612
1613         /*
1614          * Remove all entries
1615          */
1616
1617         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1618         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1619                 hlist_for_each_entry_safe(entry, node, next,
1620                                           &priv->lec_arp_tables[i], next) {
1621                         lec_arp_remove(priv, entry);
1622                         lec_arp_put(entry);
1623                 }
1624                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1625         }
1626
1627         hlist_for_each_entry_safe(entry, node, next,
1628                                   &priv->lec_arp_empty_ones, next) {
1629                 del_timer_sync(&entry->timer);
1630                 lec_arp_clear_vccs(entry);
1631                 hlist_del(&entry->next);
1632                 lec_arp_put(entry);
1633         }
1634         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1635
1636         hlist_for_each_entry_safe(entry, node, next,
1637                                   &priv->lec_no_forward, next) {
1638                 del_timer_sync(&entry->timer);
1639                 lec_arp_clear_vccs(entry);
1640                 hlist_del(&entry->next);
1641                 lec_arp_put(entry);
1642         }
1643         INIT_HLIST_HEAD(&priv->lec_no_forward);
1644
1645         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1646                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1647                 lec_arp_clear_vccs(entry);
1648                 hlist_del(&entry->next);
1649                 lec_arp_put(entry);
1650         }
1651         INIT_HLIST_HEAD(&priv->mcast_fwds);
1652         priv->mcast_vcc = NULL;
1653         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1654 }
1655
1656 /*
1657  * Find entry by mac_address
1658  */
1659 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1660                                           const unsigned char *mac_addr)
1661 {
1662         struct hlist_node *node;
1663         struct hlist_head *head;
1664         struct lec_arp_table *entry;
1665
1666         pr_debug("%pM\n", mac_addr);
1667
1668         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1669         hlist_for_each_entry(entry, node, head, next) {
1670                 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1671                         return entry;
1672         }
1673         return NULL;
1674 }
1675
1676 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1677                                         const unsigned char *mac_addr)
1678 {
1679         struct lec_arp_table *to_return;
1680
1681         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1682         if (!to_return) {
1683                 pr_info("LEC: Arp entry kmalloc failed\n");
1684                 return NULL;
1685         }
1686         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1687         INIT_HLIST_NODE(&to_return->next);
1688         setup_timer(&to_return->timer, lec_arp_expire_arp,
1689                         (unsigned long)to_return);
1690         to_return->last_used = jiffies;
1691         to_return->priv = priv;
1692         skb_queue_head_init(&to_return->tx_wait);
1693         atomic_set(&to_return->usage, 1);
1694         return to_return;
1695 }
1696
1697 /* Arp sent timer expired */
1698 static void lec_arp_expire_arp(unsigned long data)
1699 {
1700         struct lec_arp_table *entry;
1701
1702         entry = (struct lec_arp_table *)data;
1703
1704         pr_debug("\n");
1705         if (entry->status == ESI_ARP_PENDING) {
1706                 if (entry->no_tries <= entry->priv->max_retry_count) {
1707                         if (entry->is_rdesc)
1708                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1709                                              entry->mac_addr, NULL, NULL);
1710                         else
1711                                 send_to_lecd(entry->priv, l_arp_xmt,
1712                                              entry->mac_addr, NULL, NULL);
1713                         entry->no_tries++;
1714                 }
1715                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1716         }
1717 }
1718
1719 /* Unknown/unused vcc expire, remove associated entry */
1720 static void lec_arp_expire_vcc(unsigned long data)
1721 {
1722         unsigned long flags;
1723         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1724         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1725
1726         del_timer(&to_remove->timer);
1727
1728         pr_debug("%p %p: vpi:%d vci:%d\n",
1729                  to_remove, priv,
1730                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1731                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1732
1733         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1734         hlist_del(&to_remove->next);
1735         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1736
1737         lec_arp_clear_vccs(to_remove);
1738         lec_arp_put(to_remove);
1739 }
1740
1741 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1742                                    unsigned long now,
1743                                    struct lec_priv *priv)
1744 {
1745         unsigned long time_to_check;
1746
1747         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1748                 time_to_check = priv->forward_delay_time;
1749         else
1750                 time_to_check = priv->aging_time;
1751
1752         pr_debug("About to expire: %lx - %lx > %lx\n",
1753                  now, entry->last_used, time_to_check);
1754         if (time_after(now, entry->last_used + time_to_check) &&
1755             !(entry->flags & LEC_PERMANENT_FLAG) &&
1756             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1757                 /* Remove entry */
1758                 pr_debug("Entry timed out\n");
1759                 lec_arp_remove(priv, entry);
1760                 lec_arp_put(entry);
1761         } else {
1762                 /* Something else */
1763                 if ((entry->status == ESI_VC_PENDING ||
1764                      entry->status == ESI_ARP_PENDING) &&
1765                     time_after_eq(now, entry->timestamp +
1766                                        priv->max_unknown_frame_time)) {
1767                         entry->timestamp = jiffies;
1768                         entry->packets_flooded = 0;
1769                         if (entry->status == ESI_VC_PENDING)
1770                                 send_to_lecd(priv, l_svc_setup,
1771                                              entry->mac_addr,
1772                                              entry->atm_addr,
1773                                              NULL);
1774                 }
1775                 if (entry->status == ESI_FLUSH_PENDING &&
1776                     time_after_eq(now, entry->timestamp +
1777                                        priv->path_switching_delay)) {
1778                         lec_arp_hold(entry);
1779                         return true;
1780                 }
1781         }
1782
1783         return false;
1784 }
1785 /*
1786  * Expire entries.
1787  * 1. Re-set timer
1788  * 2. For each entry, delete entries that have aged past the age limit.
1789  * 3. For each entry, depending on the status of the entry, perform
1790  *    the following maintenance.
1791  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1792  *       tick_count is above the max_unknown_frame_time, clear
1793  *       the tick_count to zero and clear the packets_flooded counter
1794  *       to zero. This supports the packet rate limit per address
1795  *       while flooding unknowns.
1796  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1797  *       than or equal to the path_switching_delay, change the status
1798  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1799  *       regardless of the progress of the flush protocol.
1800  */
1801 static void lec_arp_check_expire(struct work_struct *work)
1802 {
1803         unsigned long flags;
1804         struct lec_priv *priv =
1805                 container_of(work, struct lec_priv, lec_arp_work.work);
1806         struct hlist_node *node, *next;
1807         struct lec_arp_table *entry;
1808         unsigned long now;
1809         int i;
1810
1811         pr_debug("%p\n", priv);
1812         now = jiffies;
1813 restart:
1814         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1815         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1816                 hlist_for_each_entry_safe(entry, node, next,
1817                                           &priv->lec_arp_tables[i], next) {
1818                         if (__lec_arp_check_expire(entry, now, priv)) {
1819                                 struct sk_buff *skb;
1820                                 struct atm_vcc *vcc = entry->vcc;
1821
1822                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1823                                                        flags);
1824                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1825                                         lec_send(vcc, skb);
1826                                 entry->last_used = jiffies;
1827                                 entry->status = ESI_FORWARD_DIRECT;
1828                                 lec_arp_put(entry);
1829
1830                                 goto restart;
1831                         }
1832                 }
1833         }
1834         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1835
1836         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1837 }
1838
1839 /*
1840  * Try to find vcc where mac_address is attached.
1841  *
1842  */
1843 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1844                                        const unsigned char *mac_to_find,
1845                                        int is_rdesc,
1846                                        struct lec_arp_table **ret_entry)
1847 {
1848         unsigned long flags;
1849         struct lec_arp_table *entry;
1850         struct atm_vcc *found;
1851
1852         if (mac_to_find[0] & 0x01) {
1853                 switch (priv->lane_version) {
1854                 case 1:
1855                         return priv->mcast_vcc;
1856                 case 2: /* LANE2 wants arp for multicast addresses */
1857                         if (!compare_ether_addr(mac_to_find, bus_mac))
1858                                 return priv->mcast_vcc;
1859                         break;
1860                 default:
1861                         break;
1862                 }
1863         }
1864
1865         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1866         entry = lec_arp_find(priv, mac_to_find);
1867
1868         if (entry) {
1869                 if (entry->status == ESI_FORWARD_DIRECT) {
1870                         /* Connection Ok */
1871                         entry->last_used = jiffies;
1872                         lec_arp_hold(entry);
1873                         *ret_entry = entry;
1874                         found = entry->vcc;
1875                         goto out;
1876                 }
1877                 /*
1878                  * If the LE_ARP cache entry is still pending, reset count to 0
1879                  * so another LE_ARP request can be made for this frame.
1880                  */
1881                 if (entry->status == ESI_ARP_PENDING)
1882                         entry->no_tries = 0;
1883                 /*
1884                  * Data direct VC not yet set up, check to see if the unknown
1885                  * frame count is greater than the limit. If the limit has
1886                  * not been reached, allow the caller to send packet to
1887                  * BUS.
1888                  */
1889                 if (entry->status != ESI_FLUSH_PENDING &&
1890                     entry->packets_flooded <
1891                     priv->maximum_unknown_frame_count) {
1892                         entry->packets_flooded++;
1893                         pr_debug("Flooding..\n");
1894                         found = priv->mcast_vcc;
1895                         goto out;
1896                 }
1897                 /*
1898                  * We got here because entry->status == ESI_FLUSH_PENDING
1899                  * or BUS flood limit was reached for an entry which is
1900                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1901                  */
1902                 lec_arp_hold(entry);
1903                 *ret_entry = entry;
1904                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1905                          entry->vcc);
1906                 found = NULL;
1907         } else {
1908                 /* No matching entry was found */
1909                 entry = make_entry(priv, mac_to_find);
1910                 pr_debug("Making entry\n");
1911                 if (!entry) {
1912                         found = priv->mcast_vcc;
1913                         goto out;
1914                 }
1915                 lec_arp_add(priv, entry);
1916                 /* We want arp-request(s) to be sent */
1917                 entry->packets_flooded = 1;
1918                 entry->status = ESI_ARP_PENDING;
1919                 entry->no_tries = 1;
1920                 entry->last_used = entry->timestamp = jiffies;
1921                 entry->is_rdesc = is_rdesc;
1922                 if (entry->is_rdesc)
1923                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1924                                      NULL);
1925                 else
1926                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1927                 entry->timer.expires = jiffies + (1 * HZ);
1928                 entry->timer.function = lec_arp_expire_arp;
1929                 add_timer(&entry->timer);
1930                 found = priv->mcast_vcc;
1931         }
1932
1933 out:
1934         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1935         return found;
1936 }
1937
1938 static int
1939 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1940                 unsigned long permanent)
1941 {
1942         unsigned long flags;
1943         struct hlist_node *node, *next;
1944         struct lec_arp_table *entry;
1945         int i;
1946
1947         pr_debug("\n");
1948         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1949         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1950                 hlist_for_each_entry_safe(entry, node, next,
1951                                           &priv->lec_arp_tables[i], next) {
1952                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1953                             (permanent ||
1954                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1955                                 lec_arp_remove(priv, entry);
1956                                 lec_arp_put(entry);
1957                         }
1958                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1959                         return 0;
1960                 }
1961         }
1962         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1963         return -1;
1964 }
1965
1966 /*
1967  * Notifies:  Response to arp_request (atm_addr != NULL)
1968  */
1969 static void
1970 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1971                const unsigned char *atm_addr, unsigned long remoteflag,
1972                unsigned int targetless_le_arp)
1973 {
1974         unsigned long flags;
1975         struct hlist_node *node, *next;
1976         struct lec_arp_table *entry, *tmp;
1977         int i;
1978
1979         pr_debug("%smac:%pM\n",
1980                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1981
1982         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1983         entry = lec_arp_find(priv, mac_addr);
1984         if (entry == NULL && targetless_le_arp)
1985                 goto out;       /*
1986                                  * LANE2: ignore targetless LE_ARPs for which
1987                                  * we have no entry in the cache. 7.1.30
1988                                  */
1989         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1990                 hlist_for_each_entry_safe(entry, node, next,
1991                                           &priv->lec_arp_empty_ones, next) {
1992                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1993                                 hlist_del(&entry->next);
1994                                 del_timer(&entry->timer);
1995                                 tmp = lec_arp_find(priv, mac_addr);
1996                                 if (tmp) {
1997                                         del_timer(&tmp->timer);
1998                                         tmp->status = ESI_FORWARD_DIRECT;
1999                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2000                                         tmp->vcc = entry->vcc;
2001                                         tmp->old_push = entry->old_push;
2002                                         tmp->last_used = jiffies;
2003                                         del_timer(&entry->timer);
2004                                         lec_arp_put(entry);
2005                                         entry = tmp;
2006                                 } else {
2007                                         entry->status = ESI_FORWARD_DIRECT;
2008                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2009                                         entry->last_used = jiffies;
2010                                         lec_arp_add(priv, entry);
2011                                 }
2012                                 if (remoteflag)
2013                                         entry->flags |= LEC_REMOTE_FLAG;
2014                                 else
2015                                         entry->flags &= ~LEC_REMOTE_FLAG;
2016                                 pr_debug("After update\n");
2017                                 dump_arp_table(priv);
2018                                 goto out;
2019                         }
2020                 }
2021         }
2022
2023         entry = lec_arp_find(priv, mac_addr);
2024         if (!entry) {
2025                 entry = make_entry(priv, mac_addr);
2026                 if (!entry)
2027                         goto out;
2028                 entry->status = ESI_UNKNOWN;
2029                 lec_arp_add(priv, entry);
2030                 /* Temporary, changes before end of function */
2031         }
2032         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2033         del_timer(&entry->timer);
2034         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2035                 hlist_for_each_entry(tmp, node,
2036                                      &priv->lec_arp_tables[i], next) {
2037                         if (entry != tmp &&
2038                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2039                                 /* Vcc to this host exists */
2040                                 if (tmp->status > ESI_VC_PENDING) {
2041                                         /*
2042                                          * ESI_FLUSH_PENDING,
2043                                          * ESI_FORWARD_DIRECT
2044                                          */
2045                                         entry->vcc = tmp->vcc;
2046                                         entry->old_push = tmp->old_push;
2047                                 }
2048                                 entry->status = tmp->status;
2049                                 break;
2050                         }
2051                 }
2052         }
2053         if (remoteflag)
2054                 entry->flags |= LEC_REMOTE_FLAG;
2055         else
2056                 entry->flags &= ~LEC_REMOTE_FLAG;
2057         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2058                 entry->status = ESI_VC_PENDING;
2059                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2060         }
2061         pr_debug("After update2\n");
2062         dump_arp_table(priv);
2063 out:
2064         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2065 }
2066
2067 /*
2068  * Notifies: Vcc setup ready
2069  */
2070 static void
2071 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2072               struct atm_vcc *vcc,
2073               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2074 {
2075         unsigned long flags;
2076         struct hlist_node *node;
2077         struct lec_arp_table *entry;
2078         int i, found_entry = 0;
2079
2080         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2081         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2082         if (ioc_data->receive == 2) {
2083                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2084 #if 0
2085                 entry = lec_arp_find(priv, bus_mac);
2086                 if (!entry) {
2087                         pr_info("LEC_ARP: Multicast entry not found!\n");
2088                         goto out;
2089                 }
2090                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2091                 entry->recv_vcc = vcc;
2092                 entry->old_recv_push = old_push;
2093 #endif
2094                 entry = make_entry(priv, bus_mac);
2095                 if (entry == NULL)
2096                         goto out;
2097                 del_timer(&entry->timer);
2098                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2099                 entry->recv_vcc = vcc;
2100                 entry->old_recv_push = old_push;
2101                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2102                 goto out;
2103         } else if (ioc_data->receive == 1) {
2104                 /*
2105                  * Vcc which we don't want to make default vcc,
2106                  * attach it anyway.
2107                  */
2108                 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",
2109                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2110                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2111                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2112                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2113                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2114                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2115                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2116                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2117                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2118                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2119                 entry = make_entry(priv, bus_mac);
2120                 if (entry == NULL)
2121                         goto out;
2122                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2123                 memset(entry->mac_addr, 0, ETH_ALEN);
2124                 entry->recv_vcc = vcc;
2125                 entry->old_recv_push = old_push;
2126                 entry->status = ESI_UNKNOWN;
2127                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2128                 entry->timer.function = lec_arp_expire_vcc;
2129                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2130                 add_timer(&entry->timer);
2131                 dump_arp_table(priv);
2132                 goto out;
2133         }
2134         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",
2135                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2136                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2137                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2138                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2139                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2140                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2141                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2142                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2143                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2144                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2145         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2146                 hlist_for_each_entry(entry, node,
2147                                      &priv->lec_arp_tables[i], next) {
2148                         if (memcmp
2149                             (ioc_data->atm_addr, entry->atm_addr,
2150                              ATM_ESA_LEN) == 0) {
2151                                 pr_debug("LEC_ARP: Attaching data direct\n");
2152                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2153                                          entry->vcc ? entry->vcc->vci : 0,
2154                                          entry->recv_vcc ? entry->recv_vcc->
2155                                          vci : 0);
2156                                 found_entry = 1;
2157                                 del_timer(&entry->timer);
2158                                 entry->vcc = vcc;
2159                                 entry->old_push = old_push;
2160                                 if (entry->status == ESI_VC_PENDING) {
2161                                         if (priv->maximum_unknown_frame_count
2162                                             == 0)
2163                                                 entry->status =
2164                                                     ESI_FORWARD_DIRECT;
2165                                         else {
2166                                                 entry->timestamp = jiffies;
2167                                                 entry->status =
2168                                                     ESI_FLUSH_PENDING;
2169 #if 0
2170                                                 send_to_lecd(priv, l_flush_xmt,
2171                                                              NULL,
2172                                                              entry->atm_addr,
2173                                                              NULL);
2174 #endif
2175                                         }
2176                                 } else {
2177                                         /*
2178                                          * They were forming a connection
2179                                          * to us, and we to them. Our
2180                                          * ATM address is numerically lower
2181                                          * than theirs, so we make connection
2182                                          * we formed into default VCC (8.1.11).
2183                                          * Connection they made gets torn
2184                                          * down. This might confuse some
2185                                          * clients. Can be changed if
2186                                          * someone reports trouble...
2187                                          */
2188                                         ;
2189                                 }
2190                         }
2191                 }
2192         }
2193         if (found_entry) {
2194                 pr_debug("After vcc was added\n");
2195                 dump_arp_table(priv);
2196                 goto out;
2197         }
2198         /*
2199          * Not found, snatch address from first data packet that arrives
2200          * from this vcc
2201          */
2202         entry = make_entry(priv, bus_mac);
2203         if (!entry)
2204                 goto out;
2205         entry->vcc = vcc;
2206         entry->old_push = old_push;
2207         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2208         memset(entry->mac_addr, 0, ETH_ALEN);
2209         entry->status = ESI_UNKNOWN;
2210         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2211         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2212         entry->timer.function = lec_arp_expire_vcc;
2213         add_timer(&entry->timer);
2214         pr_debug("After vcc was added\n");
2215         dump_arp_table(priv);
2216 out:
2217         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2218 }
2219
2220 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2221 {
2222         unsigned long flags;
2223         struct hlist_node *node;
2224         struct lec_arp_table *entry;
2225         int i;
2226
2227         pr_debug("%lx\n", tran_id);
2228 restart:
2229         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2230         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2231                 hlist_for_each_entry(entry, node,
2232                                      &priv->lec_arp_tables[i], next) {
2233                         if (entry->flush_tran_id == tran_id &&
2234                             entry->status == ESI_FLUSH_PENDING) {
2235                                 struct sk_buff *skb;
2236                                 struct atm_vcc *vcc = entry->vcc;
2237
2238                                 lec_arp_hold(entry);
2239                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2240                                                        flags);
2241                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2242                                         lec_send(vcc, skb);
2243                                 entry->last_used = jiffies;
2244                                 entry->status = ESI_FORWARD_DIRECT;
2245                                 lec_arp_put(entry);
2246                                 pr_debug("LEC_ARP: Flushed\n");
2247                                 goto restart;
2248                         }
2249                 }
2250         }
2251         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2252         dump_arp_table(priv);
2253 }
2254
2255 static void
2256 lec_set_flush_tran_id(struct lec_priv *priv,
2257                       const unsigned char *atm_addr, unsigned long tran_id)
2258 {
2259         unsigned long flags;
2260         struct hlist_node *node;
2261         struct lec_arp_table *entry;
2262         int i;
2263
2264         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2265         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2266                 hlist_for_each_entry(entry, node,
2267                                      &priv->lec_arp_tables[i], next) {
2268                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2269                                 entry->flush_tran_id = tran_id;
2270                                 pr_debug("Set flush transaction id to %lx for %p\n",
2271                                          tran_id, entry);
2272                         }
2273                 }
2274         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2275 }
2276
2277 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2278 {
2279         unsigned long flags;
2280         unsigned char mac_addr[] = {
2281                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2282         };
2283         struct lec_arp_table *to_add;
2284         struct lec_vcc_priv *vpriv;
2285         int err = 0;
2286
2287         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2288         if (!vpriv)
2289                 return -ENOMEM;
2290         vpriv->xoff = 0;
2291         vpriv->old_pop = vcc->pop;
2292         vcc->user_back = vpriv;
2293         vcc->pop = lec_pop;
2294         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2295         to_add = make_entry(priv, mac_addr);
2296         if (!to_add) {
2297                 vcc->pop = vpriv->old_pop;
2298                 kfree(vpriv);
2299                 err = -ENOMEM;
2300                 goto out;
2301         }
2302         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2303         to_add->status = ESI_FORWARD_DIRECT;
2304         to_add->flags |= LEC_PERMANENT_FLAG;
2305         to_add->vcc = vcc;
2306         to_add->old_push = vcc->push;
2307         vcc->push = lec_push;
2308         priv->mcast_vcc = vcc;
2309         lec_arp_add(priv, to_add);
2310 out:
2311         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2312         return err;
2313 }
2314
2315 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2316 {
2317         unsigned long flags;
2318         struct hlist_node *node, *next;
2319         struct lec_arp_table *entry;
2320         int i;
2321
2322         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2323         dump_arp_table(priv);
2324
2325         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2326
2327         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2328                 hlist_for_each_entry_safe(entry, node, next,
2329                                           &priv->lec_arp_tables[i], next) {
2330                         if (vcc == entry->vcc) {
2331                                 lec_arp_remove(priv, entry);
2332                                 lec_arp_put(entry);
2333                                 if (priv->mcast_vcc == vcc)
2334                                         priv->mcast_vcc = NULL;
2335                         }
2336                 }
2337         }
2338
2339         hlist_for_each_entry_safe(entry, node, next,
2340                                   &priv->lec_arp_empty_ones, next) {
2341                 if (entry->vcc == vcc) {
2342                         lec_arp_clear_vccs(entry);
2343                         del_timer(&entry->timer);
2344                         hlist_del(&entry->next);
2345                         lec_arp_put(entry);
2346                 }
2347         }
2348
2349         hlist_for_each_entry_safe(entry, node, next,
2350                                   &priv->lec_no_forward, next) {
2351                 if (entry->recv_vcc == vcc) {
2352                         lec_arp_clear_vccs(entry);
2353                         del_timer(&entry->timer);
2354                         hlist_del(&entry->next);
2355                         lec_arp_put(entry);
2356                 }
2357         }
2358
2359         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2360                 if (entry->recv_vcc == vcc) {
2361                         lec_arp_clear_vccs(entry);
2362                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2363                         hlist_del(&entry->next);
2364                         lec_arp_put(entry);
2365                 }
2366         }
2367
2368         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2369         dump_arp_table(priv);
2370 }
2371
2372 static void
2373 lec_arp_check_empties(struct lec_priv *priv,
2374                       struct atm_vcc *vcc, struct sk_buff *skb)
2375 {
2376         unsigned long flags;
2377         struct hlist_node *node, *next;
2378         struct lec_arp_table *entry, *tmp;
2379         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2380         unsigned char *src;
2381 #ifdef CONFIG_TR
2382         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2383
2384         if (priv->is_trdev)
2385                 src = tr_hdr->h_source;
2386         else
2387 #endif
2388                 src = hdr->h_source;
2389
2390         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2391         hlist_for_each_entry_safe(entry, node, next,
2392                                   &priv->lec_arp_empty_ones, next) {
2393                 if (vcc == entry->vcc) {
2394                         del_timer(&entry->timer);
2395                         memcpy(entry->mac_addr, src, ETH_ALEN);
2396                         entry->status = ESI_FORWARD_DIRECT;
2397                         entry->last_used = jiffies;
2398                         /* We might have got an entry */
2399                         tmp = lec_arp_find(priv, src);
2400                         if (tmp) {
2401                                 lec_arp_remove(priv, tmp);
2402                                 lec_arp_put(tmp);
2403                         }
2404                         hlist_del(&entry->next);
2405                         lec_arp_add(priv, entry);
2406                         goto out;
2407                 }
2408         }
2409         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2410 out:
2411         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2412 }
2413
2414 MODULE_LICENSE("GPL");