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Linux 2.6.31.6
[linux/fpc-iii.git] / net / atm / lec.c
blobff2e594dca9b935efe720799e6367c8208e630cb
1 /*
2 * lec.c: Lan Emulation driver
3 *
4 * Marko Kiiskila <mkiiskila@yahoo.com>
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/bitops.h>
9 #include <linux/capability.h>
10
11 /* We are ethernet device */
12 #include <linux/if_ether.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <net/sock.h>
16 #include <linux/skbuff.h>
17 #include <linux/ip.h>
18 #include <asm/byteorder.h>
19 #include <asm/uaccess.h>
20 #include <net/arp.h>
21 #include <net/dst.h>
22 #include <linux/proc_fs.h>
23 #include <linux/spinlock.h>
24 #include <linux/seq_file.h>
25
26 /* TokenRing if needed */
27 #ifdef CONFIG_TR
28 #include <linux/trdevice.h>
29 #endif
30
31 /* And atm device */
32 #include <linux/atmdev.h>
33 #include <linux/atmlec.h>
34
35 /* Proxy LEC knows about bridging */
36 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
37 #include "../bridge/br_private.h"
38
39 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
40 #endif
41
42 /* Modular too */
43 #include <linux/module.h>
44 #include <linux/init.h>
45
46 #include "lec.h"
47 #include "lec_arpc.h"
48 #include "resources.h"
49
50 #define DUMP_PACKETS 0 /*
51 * 0 = None,
52 * 1 = 30 first bytes
53 * 2 = Whole packet
54 */
55
56 #define LEC_UNRES_QUE_LEN 8 /*
57 * number of tx packets to queue for a
58 * single destination while waiting for SVC
59 */
60
61 static int lec_open(struct net_device *dev);
62 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
63 static int lec_close(struct net_device *dev);
64 static void lec_init(struct net_device *dev);
65 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
66 const unsigned char *mac_addr);
67 static int lec_arp_remove(struct lec_priv *priv,
68 struct lec_arp_table *to_remove);
69 /* LANE2 functions */
70 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
71 const u8 *tlvs, u32 sizeoftlvs);
72 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
73 u8 **tlvs, u32 *sizeoftlvs);
74 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
75 const u8 *tlvs, u32 sizeoftlvs);
76
77 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
78 unsigned long permanent);
79 static void lec_arp_check_empties(struct lec_priv *priv,
80 struct atm_vcc *vcc, struct sk_buff *skb);
81 static void lec_arp_destroy(struct lec_priv *priv);
82 static void lec_arp_init(struct lec_priv *priv);
83 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
84 const unsigned char *mac_to_find,
85 int is_rdesc,
86 struct lec_arp_table **ret_entry);
87 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
88 const unsigned char *atm_addr, unsigned long remoteflag,
89 unsigned int targetless_le_arp);
90 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
91 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
92 static void lec_set_flush_tran_id(struct lec_priv *priv,
93 const unsigned char *atm_addr,
94 unsigned long tran_id);
95 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
96 struct atm_vcc *vcc,
97 void (*old_push) (struct atm_vcc *vcc,
98 struct sk_buff *skb));
99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
100
101 /* must be done under lec_arp_lock */
102 static inline void lec_arp_hold(struct lec_arp_table *entry)
103 {
104 atomic_inc(&entry->usage);
105 }
106
107 static inline void lec_arp_put(struct lec_arp_table *entry)
108 {
109 if (atomic_dec_and_test(&entry->usage))
110 kfree(entry);
111 }
112
113
114 static struct lane2_ops lane2_ops = {
115 lane2_resolve, /* resolve, spec 3.1.3 */
116 lane2_associate_req, /* associate_req, spec 3.1.4 */
117 NULL /* associate indicator, spec 3.1.5 */
118 };
119
120 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
121
122 /* Device structures */
123 static struct net_device *dev_lec[MAX_LEC_ITF];
124
125 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
126 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
127 {
128 struct ethhdr *eth;
129 char *buff;
130 struct lec_priv *priv;
131
132 /*
133 * Check if this is a BPDU. If so, ask zeppelin to send
134 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
135 * as the Config BPDU has
136 */
137 eth = (struct ethhdr *)skb->data;
138 buff = skb->data + skb->dev->hard_header_len;
139 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
140 struct sock *sk;
141 struct sk_buff *skb2;
142 struct atmlec_msg *mesg;
143
144 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
145 if (skb2 == NULL)
146 return;
147 skb2->len = sizeof(struct atmlec_msg);
148 mesg = (struct atmlec_msg *)skb2->data;
149 mesg->type = l_topology_change;
150 buff += 4;
151 mesg->content.normal.flag = *buff & 0x01; /* 0x01 is topology change */
152
153 priv = netdev_priv(dev);
154 atm_force_charge(priv->lecd, skb2->truesize);
155 sk = sk_atm(priv->lecd);
156 skb_queue_tail(&sk->sk_receive_queue, skb2);
157 sk->sk_data_ready(sk, skb2->len);
158 }
159
160 return;
161 }
162 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
163
164 /*
165 * Modelled after tr_type_trans
166 * All multicast and ARE or STE frames go to BUS.
167 * Non source routed frames go by destination address.
168 * Last hop source routed frames go by destination address.
169 * Not last hop source routed frames go by _next_ route descriptor.
170 * Returns pointer to destination MAC address or fills in rdesc
171 * and returns NULL.
172 */
173 #ifdef CONFIG_TR
174 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
175 {
176 struct trh_hdr *trh;
177 unsigned int riflen, num_rdsc;
178
179 trh = (struct trh_hdr *)packet;
180 if (trh->daddr[0] & (uint8_t) 0x80)
181 return bus_mac; /* multicast */
182
183 if (trh->saddr[0] & TR_RII) {
184 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
185 if ((ntohs(trh->rcf) >> 13) != 0)
186 return bus_mac; /* ARE or STE */
187 } else
188 return trh->daddr; /* not source routed */
189
190 if (riflen < 6)
191 return trh->daddr; /* last hop, source routed */
192
193 /* riflen is 6 or more, packet has more than one route descriptor */
194 num_rdsc = (riflen / 2) - 1;
195 memset(rdesc, 0, ETH_ALEN);
196 /* offset 4 comes from LAN destination field in LE control frames */
197 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
198 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
199 else {
200 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
201 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
202 }
203
204 return NULL;
205 }
206 #endif /* CONFIG_TR */
207
208 /*
209 * Open/initialize the netdevice. This is called (in the current kernel)
210 * sometime after booting when the 'ifconfig' program is run.
211 *
212 * This routine should set everything up anew at each open, even
213 * registers that "should" only need to be set once at boot, so that
214 * there is non-reboot way to recover if something goes wrong.
215 */
216
217 static int lec_open(struct net_device *dev)
218 {
219 netif_start_queue(dev);
220 memset(&dev->stats, 0, sizeof(struct net_device_stats));
221
222 return 0;
223 }
224
225 static void
226 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
227 {
228 struct net_device *dev = skb->dev;
229
230 ATM_SKB(skb)->vcc = vcc;
231 ATM_SKB(skb)->atm_options = vcc->atm_options;
232
233 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
234 if (vcc->send(vcc, skb) < 0) {
235 dev->stats.tx_dropped++;
236 return;
237 }
238
239 dev->stats.tx_packets++;
240 dev->stats.tx_bytes += skb->len;
241 }
242
243 static void lec_tx_timeout(struct net_device *dev)
244 {
245 printk(KERN_INFO "%s: tx timeout\n", dev->name);
246 dev->trans_start = jiffies;
247 netif_wake_queue(dev);
248 }
249
250 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
251 {
252 struct sk_buff *skb2;
253 struct lec_priv *priv = netdev_priv(dev);
254 struct lecdatahdr_8023 *lec_h;
255 struct atm_vcc *vcc;
256 struct lec_arp_table *entry;
257 unsigned char *dst;
258 int min_frame_size;
259 #ifdef CONFIG_TR
260 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */
261 #endif
262 int is_rdesc;
263 #if DUMP_PACKETS > 0
264 char buf[300];
265 int i = 0;
266 #endif /* DUMP_PACKETS >0 */
267
268 pr_debug("lec_start_xmit called\n");
269 if (!priv->lecd) {
270 printk("%s:No lecd attached\n", dev->name);
271 dev->stats.tx_errors++;
272 netif_stop_queue(dev);
273 kfree_skb(skb);
274 return NETDEV_TX_OK;
275 }
276
277 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
278 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
279 (long)skb_end_pointer(skb));
280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
281 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
282 lec_handle_bridge(skb, dev);
283 #endif
284
285 /* Make sure we have room for lec_id */
286 if (skb_headroom(skb) < 2) {
287
288 pr_debug("lec_start_xmit: reallocating skb\n");
289 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
290 kfree_skb(skb);
291 if (skb2 == NULL)
292 return 0;
293 skb = skb2;
294 }
295 skb_push(skb, 2);
296
297 /* Put le header to place, works for TokenRing too */
298 lec_h = (struct lecdatahdr_8023 *)skb->data;
299 lec_h->le_header = htons(priv->lecid);
300
301 #ifdef CONFIG_TR
302 /*
303 * Ugly. Use this to realign Token Ring packets for
304 * e.g. PCA-200E driver.
305 */
306 if (priv->is_trdev) {
307 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
308 kfree_skb(skb);
309 if (skb2 == NULL)
310 return 0;
311 skb = skb2;
312 }
313 #endif
314
315 #if DUMP_PACKETS > 0
316 printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
317 skb->len, priv->lecid);
318 #if DUMP_PACKETS >= 2
319 for (i = 0; i < skb->len && i < 99; i++) {
320 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
321 }
322 #elif DUMP_PACKETS >= 1
323 for (i = 0; i < skb->len && i < 30; i++) {
324 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
325 }
326 #endif /* DUMP_PACKETS >= 1 */
327 if (i == skb->len)
328 printk("%s\n", buf);
329 else
330 printk("%s...\n", buf);
331 #endif /* DUMP_PACKETS > 0 */
332
333 /* Minimum ethernet-frame size */
334 #ifdef CONFIG_TR
335 if (priv->is_trdev)
336 min_frame_size = LEC_MINIMUM_8025_SIZE;
337 else
338 #endif
339 min_frame_size = LEC_MINIMUM_8023_SIZE;
340 if (skb->len < min_frame_size) {
341 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
342 skb2 = skb_copy_expand(skb, 0,
343 min_frame_size - skb->truesize,
344 GFP_ATOMIC);
345 dev_kfree_skb(skb);
346 if (skb2 == NULL) {
347 dev->stats.tx_dropped++;
348 return 0;
349 }
350 skb = skb2;
351 }
352 skb_put(skb, min_frame_size - skb->len);
353 }
354
355 /* Send to right vcc */
356 is_rdesc = 0;
357 dst = lec_h->h_dest;
358 #ifdef CONFIG_TR
359 if (priv->is_trdev) {
360 dst = get_tr_dst(skb->data + 2, rdesc);
361 if (dst == NULL) {
362 dst = rdesc;
363 is_rdesc = 1;
364 }
365 }
366 #endif
367 entry = NULL;
368 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
369 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
370 vcc, vcc ? vcc->flags : 0, entry);
371 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
372 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
373 pr_debug("%s:lec_start_xmit: queuing packet, ",
374 dev->name);
375 pr_debug("MAC address %pM\n", lec_h->h_dest);
376 skb_queue_tail(&entry->tx_wait, skb);
377 } else {
378 pr_debug
379 ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
380 dev->name);
381 pr_debug("MAC address %pM\n", lec_h->h_dest);
382 dev->stats.tx_dropped++;
383 dev_kfree_skb(skb);
384 }
385 goto out;
386 }
387 #if DUMP_PACKETS > 0
388 printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
389 #endif /* DUMP_PACKETS > 0 */
390
391 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
392 pr_debug("lec.c: emptying tx queue, ");
393 pr_debug("MAC address %pM\n", lec_h->h_dest);
394 lec_send(vcc, skb2);
395 }
396
397 lec_send(vcc, skb);
398
399 if (!atm_may_send(vcc, 0)) {
400 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
401
402 vpriv->xoff = 1;
403 netif_stop_queue(dev);
404
405 /*
406 * vcc->pop() might have occurred in between, making
407 * the vcc usuable again. Since xmit is serialized,
408 * this is the only situation we have to re-test.
409 */
410
411 if (atm_may_send(vcc, 0))
412 netif_wake_queue(dev);
413 }
414
415 out:
416 if (entry)
417 lec_arp_put(entry);
418 dev->trans_start = jiffies;
419 return 0;
420 }
421
422 /* The inverse routine to net_open(). */
423 static int lec_close(struct net_device *dev)
424 {
425 netif_stop_queue(dev);
426 return 0;
427 }
428
429 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
430 {
431 unsigned long flags;
432 struct net_device *dev = (struct net_device *)vcc->proto_data;
433 struct lec_priv *priv = netdev_priv(dev);
434 struct atmlec_msg *mesg;
435 struct lec_arp_table *entry;
436 int i;
437 char *tmp; /* FIXME */
438
439 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
440 mesg = (struct atmlec_msg *)skb->data;
441 tmp = skb->data;
442 tmp += sizeof(struct atmlec_msg);
443 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
444 switch (mesg->type) {
445 case l_set_mac_addr:
446 for (i = 0; i < 6; i++) {
447 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
448 }
449 break;
450 case l_del_mac_addr:
451 for (i = 0; i < 6; i++) {
452 dev->dev_addr[i] = 0;
453 }
454 break;
455 case l_addr_delete:
456 lec_addr_delete(priv, mesg->content.normal.atm_addr,
457 mesg->content.normal.flag);
458 break;
459 case l_topology_change:
460 priv->topology_change = mesg->content.normal.flag;
461 break;
462 case l_flush_complete:
463 lec_flush_complete(priv, mesg->content.normal.flag);
464 break;
465 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
466 spin_lock_irqsave(&priv->lec_arp_lock, flags);
467 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
468 lec_arp_remove(priv, entry);
469 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
470
471 if (mesg->content.normal.no_source_le_narp)
472 break;
473 /* FALL THROUGH */
474 case l_arp_update:
475 lec_arp_update(priv, mesg->content.normal.mac_addr,
476 mesg->content.normal.atm_addr,
477 mesg->content.normal.flag,
478 mesg->content.normal.targetless_le_arp);
479 pr_debug("lec: in l_arp_update\n");
480 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
481 pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
482 mesg->sizeoftlvs);
483 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
484 tmp, mesg->sizeoftlvs);
485 }
486 break;
487 case l_config:
488 priv->maximum_unknown_frame_count =
489 mesg->content.config.maximum_unknown_frame_count;
490 priv->max_unknown_frame_time =
491 (mesg->content.config.max_unknown_frame_time * HZ);
492 priv->max_retry_count = mesg->content.config.max_retry_count;
493 priv->aging_time = (mesg->content.config.aging_time * HZ);
494 priv->forward_delay_time =
495 (mesg->content.config.forward_delay_time * HZ);
496 priv->arp_response_time =
497 (mesg->content.config.arp_response_time * HZ);
498 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
499 priv->path_switching_delay =
500 (mesg->content.config.path_switching_delay * HZ);
501 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
502 priv->lane2_ops = NULL;
503 if (priv->lane_version > 1)
504 priv->lane2_ops = &lane2_ops;
505 if (dev_set_mtu(dev, mesg->content.config.mtu))
506 printk("%s: change_mtu to %d failed\n", dev->name,
507 mesg->content.config.mtu);
508 priv->is_proxy = mesg->content.config.is_proxy;
509 break;
510 case l_flush_tran_id:
511 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
512 mesg->content.normal.flag);
513 break;
514 case l_set_lecid:
515 priv->lecid =
516 (unsigned short)(0xffff & mesg->content.normal.flag);
517 break;
518 case l_should_bridge:
519 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
520 {
521 pr_debug("%s: bridge zeppelin asks about %pM\n",
522 dev->name, mesg->content.proxy.mac_addr);
523
524 if (br_fdb_test_addr_hook == NULL)
525 break;
526
527 if (br_fdb_test_addr_hook(dev,
528 mesg->content.proxy.mac_addr)) {
529 /* hit from bridge table, send LE_ARP_RESPONSE */
530 struct sk_buff *skb2;
531 struct sock *sk;
532
533 pr_debug
534 ("%s: entry found, responding to zeppelin\n",
535 dev->name);
536 skb2 =
537 alloc_skb(sizeof(struct atmlec_msg),
538 GFP_ATOMIC);
539 if (skb2 == NULL)
540 break;
541 skb2->len = sizeof(struct atmlec_msg);
542 skb_copy_to_linear_data(skb2, mesg,
543 sizeof(*mesg));
544 atm_force_charge(priv->lecd, skb2->truesize);
545 sk = sk_atm(priv->lecd);
546 skb_queue_tail(&sk->sk_receive_queue, skb2);
547 sk->sk_data_ready(sk, skb2->len);
548 }
549 }
550 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
551 break;
552 default:
553 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
554 dev_kfree_skb(skb);
555 return -EINVAL;
556 }
557 dev_kfree_skb(skb);
558 return 0;
559 }
560
561 static void lec_atm_close(struct atm_vcc *vcc)
562 {
563 struct sk_buff *skb;
564 struct net_device *dev = (struct net_device *)vcc->proto_data;
565 struct lec_priv *priv = netdev_priv(dev);
566
567 priv->lecd = NULL;
568 /* Do something needful? */
569
570 netif_stop_queue(dev);
571 lec_arp_destroy(priv);
572
573 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
574 printk("%s lec_atm_close: closing with messages pending\n",
575 dev->name);
576 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
577 atm_return(vcc, skb->truesize);
578 dev_kfree_skb(skb);
579 }
580
581 printk("%s: Shut down!\n", dev->name);
582 module_put(THIS_MODULE);
583 }
584
585 static struct atmdev_ops lecdev_ops = {
586 .close = lec_atm_close,
587 .send = lec_atm_send
588 };
589
590 static struct atm_dev lecatm_dev = {
591 .ops = &lecdev_ops,
592 .type = "lec",
593 .number = 999, /* dummy device number */
594 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
595 };
596
597 /*
598 * LANE2: new argument struct sk_buff *data contains
599 * the LE_ARP based TLVs introduced in the LANE2 spec
600 */
601 static int
602 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
603 const unsigned char *mac_addr, const unsigned char *atm_addr,
604 struct sk_buff *data)
605 {
606 struct sock *sk;
607 struct sk_buff *skb;
608 struct atmlec_msg *mesg;
609
610 if (!priv || !priv->lecd) {
611 return -1;
612 }
613 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
614 if (!skb)
615 return -1;
616 skb->len = sizeof(struct atmlec_msg);
617 mesg = (struct atmlec_msg *)skb->data;
618 memset(mesg, 0, sizeof(struct atmlec_msg));
619 mesg->type = type;
620 if (data != NULL)
621 mesg->sizeoftlvs = data->len;
622 if (mac_addr)
623 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
624 else
625 mesg->content.normal.targetless_le_arp = 1;
626 if (atm_addr)
627 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
628
629 atm_force_charge(priv->lecd, skb->truesize);
630 sk = sk_atm(priv->lecd);
631 skb_queue_tail(&sk->sk_receive_queue, skb);
632 sk->sk_data_ready(sk, skb->len);
633
634 if (data != NULL) {
635 pr_debug("lec: about to send %d bytes of data\n", data->len);
636 atm_force_charge(priv->lecd, data->truesize);
637 skb_queue_tail(&sk->sk_receive_queue, data);
638 sk->sk_data_ready(sk, skb->len);
639 }
640
641 return 0;
642 }
643
644 /* shamelessly stolen from drivers/net/net_init.c */
645 static int lec_change_mtu(struct net_device *dev, int new_mtu)
646 {
647 if ((new_mtu < 68) || (new_mtu > 18190))
648 return -EINVAL;
649 dev->mtu = new_mtu;
650 return 0;
651 }
652
653 static void lec_set_multicast_list(struct net_device *dev)
654 {
655 /*
656 * by default, all multicast frames arrive over the bus.
657 * eventually support selective multicast service
658 */
659 return;
660 }
661
662 static const struct net_device_ops lec_netdev_ops = {
663 .ndo_open = lec_open,
664 .ndo_stop = lec_close,
665 .ndo_start_xmit = lec_start_xmit,
666 .ndo_change_mtu = lec_change_mtu,
667 .ndo_tx_timeout = lec_tx_timeout,
668 .ndo_set_multicast_list = lec_set_multicast_list,
669 };
670
671
672 static void lec_init(struct net_device *dev)
673 {
674 dev->netdev_ops = &lec_netdev_ops;
675 printk("%s: Initialized!\n", dev->name);
676 }
677
678 static const unsigned char lec_ctrl_magic[] = {
679 0xff,
680 0x00,
681 0x01,
682 0x01
683 };
684
685 #define LEC_DATA_DIRECT_8023 2
686 #define LEC_DATA_DIRECT_8025 3
687
688 static int lec_is_data_direct(struct atm_vcc *vcc)
689 {
690 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
691 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
692 }
693
694 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
695 {
696 unsigned long flags;
697 struct net_device *dev = (struct net_device *)vcc->proto_data;
698 struct lec_priv *priv = netdev_priv(dev);
699
700 #if DUMP_PACKETS >0
701 int i = 0;
702 char buf[300];
703
704 printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
705 vcc->vpi, vcc->vci);
706 #endif
707 if (!skb) {
708 pr_debug("%s: null skb\n", dev->name);
709 lec_vcc_close(priv, vcc);
710 return;
711 }
712 #if DUMP_PACKETS > 0
713 printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
714 skb->len, priv->lecid);
715 #if DUMP_PACKETS >= 2
716 for (i = 0; i < skb->len && i < 99; i++) {
717 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
718 }
719 #elif DUMP_PACKETS >= 1
720 for (i = 0; i < skb->len && i < 30; i++) {
721 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
722 }
723 #endif /* DUMP_PACKETS >= 1 */
724 if (i == skb->len)
725 printk("%s\n", buf);
726 else
727 printk("%s...\n", buf);
728 #endif /* DUMP_PACKETS > 0 */
729 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { /* Control frame, to daemon */
730 struct sock *sk = sk_atm(vcc);
731
732 pr_debug("%s: To daemon\n", dev->name);
733 skb_queue_tail(&sk->sk_receive_queue, skb);
734 sk->sk_data_ready(sk, skb->len);
735 } else { /* Data frame, queue to protocol handlers */
736 struct lec_arp_table *entry;
737 unsigned char *src, *dst;
738
739 atm_return(vcc, skb->truesize);
740 if (*(__be16 *) skb->data == htons(priv->lecid) ||
741 !priv->lecd || !(dev->flags & IFF_UP)) {
742 /*
743 * Probably looping back, or if lecd is missing,
744 * lecd has gone down
745 */
746 pr_debug("Ignoring frame...\n");
747 dev_kfree_skb(skb);
748 return;
749 }
750 #ifdef CONFIG_TR
751 if (priv->is_trdev)
752 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
753 else
754 #endif
755 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
756
757 /*
758 * If this is a Data Direct VCC, and the VCC does not match
759 * the LE_ARP cache entry, delete the LE_ARP cache entry.
760 */
761 spin_lock_irqsave(&priv->lec_arp_lock, flags);
762 if (lec_is_data_direct(vcc)) {
763 #ifdef CONFIG_TR
764 if (priv->is_trdev)
765 src =
766 ((struct lecdatahdr_8025 *)skb->data)->
767 h_source;
768 else
769 #endif
770 src =
771 ((struct lecdatahdr_8023 *)skb->data)->
772 h_source;
773 entry = lec_arp_find(priv, src);
774 if (entry && entry->vcc != vcc) {
775 lec_arp_remove(priv, entry);
776 lec_arp_put(entry);
777 }
778 }
779 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
780
781 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
782 !priv->is_proxy && /* Proxy wants all the packets */
783 memcmp(dst, dev->dev_addr, dev->addr_len)) {
784 dev_kfree_skb(skb);
785 return;
786 }
787 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
788 lec_arp_check_empties(priv, vcc, skb);
789 }
790 skb_pull(skb, 2); /* skip lec_id */
791 #ifdef CONFIG_TR
792 if (priv->is_trdev)
793 skb->protocol = tr_type_trans(skb, dev);
794 else
795 #endif
796 skb->protocol = eth_type_trans(skb, dev);
797 dev->stats.rx_packets++;
798 dev->stats.rx_bytes += skb->len;
799 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
800 netif_rx(skb);
801 }
802 }
803
804 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
805 {
806 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
807 struct net_device *dev = skb->dev;
808
809 if (vpriv == NULL) {
810 printk("lec_pop(): vpriv = NULL!?!?!?\n");
811 return;
812 }
813
814 vpriv->old_pop(vcc, skb);
815
816 if (vpriv->xoff && atm_may_send(vcc, 0)) {
817 vpriv->xoff = 0;
818 if (netif_running(dev) && netif_queue_stopped(dev))
819 netif_wake_queue(dev);
820 }
821 }
822
823 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
824 {
825 struct lec_vcc_priv *vpriv;
826 int bytes_left;
827 struct atmlec_ioc ioc_data;
828
829 /* Lecd must be up in this case */
830 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
831 if (bytes_left != 0) {
832 printk
833 ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
834 bytes_left);
835 }
836 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
837 !dev_lec[ioc_data.dev_num])
838 return -EINVAL;
839 if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
840 return -ENOMEM;
841 vpriv->xoff = 0;
842 vpriv->old_pop = vcc->pop;
843 vcc->user_back = vpriv;
844 vcc->pop = lec_pop;
845 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
846 &ioc_data, vcc, vcc->push);
847 vcc->proto_data = dev_lec[ioc_data.dev_num];
848 vcc->push = lec_push;
849 return 0;
850 }
851
852 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
853 {
854 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
855 return -EINVAL;
856 vcc->proto_data = dev_lec[arg];
857 return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
858 vcc);
859 }
860
861 /* Initialize device. */
862 static int lecd_attach(struct atm_vcc *vcc, int arg)
863 {
864 int i;
865 struct lec_priv *priv;
866
867 if (arg < 0)
868 i = 0;
869 else
870 i = arg;
871 #ifdef CONFIG_TR
872 if (arg >= MAX_LEC_ITF)
873 return -EINVAL;
874 #else /* Reserve the top NUM_TR_DEVS for TR */
875 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
876 return -EINVAL;
877 #endif
878 if (!dev_lec[i]) {
879 int is_trdev, size;
880
881 is_trdev = 0;
882 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
883 is_trdev = 1;
884
885 size = sizeof(struct lec_priv);
886 #ifdef CONFIG_TR
887 if (is_trdev)
888 dev_lec[i] = alloc_trdev(size);
889 else
890 #endif
891 dev_lec[i] = alloc_etherdev(size);
892 if (!dev_lec[i])
893 return -ENOMEM;
894 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
895 if (register_netdev(dev_lec[i])) {
896 free_netdev(dev_lec[i]);
897 return -EINVAL;
898 }
899
900 priv = netdev_priv(dev_lec[i]);
901 priv->is_trdev = is_trdev;
902 lec_init(dev_lec[i]);
903 } else {
904 priv = netdev_priv(dev_lec[i]);
905 if (priv->lecd)
906 return -EADDRINUSE;
907 }
908 lec_arp_init(priv);
909 priv->itfnum = i; /* LANE2 addition */
910 priv->lecd = vcc;
911 vcc->dev = &lecatm_dev;
912 vcc_insert_socket(sk_atm(vcc));
913
914 vcc->proto_data = dev_lec[i];
915 set_bit(ATM_VF_META, &vcc->flags);
916 set_bit(ATM_VF_READY, &vcc->flags);
917
918 /* Set default values to these variables */
919 priv->maximum_unknown_frame_count = 1;
920 priv->max_unknown_frame_time = (1 * HZ);
921 priv->vcc_timeout_period = (1200 * HZ);
922 priv->max_retry_count = 1;
923 priv->aging_time = (300 * HZ);
924 priv->forward_delay_time = (15 * HZ);
925 priv->topology_change = 0;
926 priv->arp_response_time = (1 * HZ);
927 priv->flush_timeout = (4 * HZ);
928 priv->path_switching_delay = (6 * HZ);
929
930 if (dev_lec[i]->flags & IFF_UP) {
931 netif_start_queue(dev_lec[i]);
932 }
933 __module_get(THIS_MODULE);
934 return i;
935 }
936
937 #ifdef CONFIG_PROC_FS
938 static char *lec_arp_get_status_string(unsigned char status)
939 {
940 static char *lec_arp_status_string[] = {
941 "ESI_UNKNOWN ",
942 "ESI_ARP_PENDING ",
943 "ESI_VC_PENDING ",
944 "<Undefined> ",
945 "ESI_FLUSH_PENDING ",
946 "ESI_FORWARD_DIRECT"
947 };
948
949 if (status > ESI_FORWARD_DIRECT)
950 status = 3; /* ESI_UNDEFINED */
951 return lec_arp_status_string[status];
952 }
953
954 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
955 {
956 int i;
957
958 for (i = 0; i < ETH_ALEN; i++)
959 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
960 seq_printf(seq, " ");
961 for (i = 0; i < ATM_ESA_LEN; i++)
962 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
963 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
964 entry->flags & 0xffff);
965 if (entry->vcc)
966 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
967 else
968 seq_printf(seq, " ");
969 if (entry->recv_vcc) {
970 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
971 entry->recv_vcc->vci);
972 }
973 seq_putc(seq, '\n');
974 }
975
976 struct lec_state {
977 unsigned long flags;
978 struct lec_priv *locked;
979 struct hlist_node *node;
980 struct net_device *dev;
981 int itf;
982 int arp_table;
983 int misc_table;
984 };
985
986 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
987 loff_t *l)
988 {
989 struct hlist_node *e = state->node;
990 struct lec_arp_table *tmp;
991
992 if (!e)
993 e = tbl->first;
994 if (e == SEQ_START_TOKEN) {
995 e = tbl->first;
996 --*l;
997 }
998
999 hlist_for_each_entry_from(tmp, e, next) {
1000 if (--*l < 0)
1001 break;
1002 }
1003 state->node = e;
1004
1005 return (*l < 0) ? state : NULL;
1006 }
1007
1008 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1009 struct lec_priv *priv)
1010 {
1011 void *v = NULL;
1012 int p;
1013
1014 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1015 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1016 if (v)
1017 break;
1018 }
1019 state->arp_table = p;
1020 return v;
1021 }
1022
1023 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1024 struct lec_priv *priv)
1025 {
1026 struct hlist_head *lec_misc_tables[] = {
1027 &priv->lec_arp_empty_ones,
1028 &priv->lec_no_forward,
1029 &priv->mcast_fwds
1030 };
1031 void *v = NULL;
1032 int q;
1033
1034 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1035 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1036 if (v)
1037 break;
1038 }
1039 state->misc_table = q;
1040 return v;
1041 }
1042
1043 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1044 struct lec_priv *priv)
1045 {
1046 if (!state->locked) {
1047 state->locked = priv;
1048 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1049 }
1050 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1051 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1052 state->locked = NULL;
1053 /* Partial state reset for the next time we get called */
1054 state->arp_table = state->misc_table = 0;
1055 }
1056 return state->locked;
1057 }
1058
1059 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1060 {
1061 struct net_device *dev;
1062 void *v;
1063
1064 dev = state->dev ? state->dev : dev_lec[state->itf];
1065 v = (dev && netdev_priv(dev)) ?
1066 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1067 if (!v && dev) {
1068 dev_put(dev);
1069 /* Partial state reset for the next time we get called */
1070 dev = NULL;
1071 }
1072 state->dev = dev;
1073 return v;
1074 }
1075
1076 static void *lec_get_idx(struct lec_state *state, loff_t l)
1077 {
1078 void *v = NULL;
1079
1080 for (; state->itf < MAX_LEC_ITF; state->itf++) {
1081 v = lec_itf_walk(state, &l);
1082 if (v)
1083 break;
1084 }
1085 return v;
1086 }
1087
1088 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1089 {
1090 struct lec_state *state = seq->private;
1091
1092 state->itf = 0;
1093 state->dev = NULL;
1094 state->locked = NULL;
1095 state->arp_table = 0;
1096 state->misc_table = 0;
1097 state->node = SEQ_START_TOKEN;
1098
1099 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1100 }
1101
1102 static void lec_seq_stop(struct seq_file *seq, void *v)
1103 {
1104 struct lec_state *state = seq->private;
1105
1106 if (state->dev) {
1107 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1108 state->flags);
1109 dev_put(state->dev);
1110 }
1111 }
1112
1113 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1114 {
1115 struct lec_state *state = seq->private;
1116
1117 v = lec_get_idx(state, 1);
1118 *pos += !!PTR_ERR(v);
1119 return v;
1120 }
1121
1122 static int lec_seq_show(struct seq_file *seq, void *v)
1123 {
1124 static char lec_banner[] = "Itf MAC ATM destination"
1125 " Status Flags "
1126 "VPI/VCI Recv VPI/VCI\n";
1127
1128 if (v == SEQ_START_TOKEN)
1129 seq_puts(seq, lec_banner);
1130 else {
1131 struct lec_state *state = seq->private;
1132 struct net_device *dev = state->dev;
1133 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1134
1135 seq_printf(seq, "%s ", dev->name);
1136 lec_info(seq, entry);
1137 }
1138 return 0;
1139 }
1140
1141 static const struct seq_operations lec_seq_ops = {
1142 .start = lec_seq_start,
1143 .next = lec_seq_next,
1144 .stop = lec_seq_stop,
1145 .show = lec_seq_show,
1146 };
1147
1148 static int lec_seq_open(struct inode *inode, struct file *file)
1149 {
1150 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1151 }
1152
1153 static const struct file_operations lec_seq_fops = {
1154 .owner = THIS_MODULE,
1155 .open = lec_seq_open,
1156 .read = seq_read,
1157 .llseek = seq_lseek,
1158 .release = seq_release_private,
1159 };
1160 #endif
1161
1162 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1163 {
1164 struct atm_vcc *vcc = ATM_SD(sock);
1165 int err = 0;
1166
1167 switch (cmd) {
1168 case ATMLEC_CTRL:
1169 case ATMLEC_MCAST:
1170 case ATMLEC_DATA:
1171 if (!capable(CAP_NET_ADMIN))
1172 return -EPERM;
1173 break;
1174 default:
1175 return -ENOIOCTLCMD;
1176 }
1177
1178 switch (cmd) {
1179 case ATMLEC_CTRL:
1180 err = lecd_attach(vcc, (int)arg);
1181 if (err >= 0)
1182 sock->state = SS_CONNECTED;
1183 break;
1184 case ATMLEC_MCAST:
1185 err = lec_mcast_attach(vcc, (int)arg);
1186 break;
1187 case ATMLEC_DATA:
1188 err = lec_vcc_attach(vcc, (void __user *)arg);
1189 break;
1190 }
1191
1192 return err;
1193 }
1194
1195 static struct atm_ioctl lane_ioctl_ops = {
1196 .owner = THIS_MODULE,
1197 .ioctl = lane_ioctl,
1198 };
1199
1200 static int __init lane_module_init(void)
1201 {
1202 #ifdef CONFIG_PROC_FS
1203 struct proc_dir_entry *p;
1204
1205 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1206 if (!p) {
1207 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1208 return -ENOMEM;
1209 }
1210 #endif
1211
1212 register_atm_ioctl(&lane_ioctl_ops);
1213 printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1214 return 0;
1215 }
1216
1217 static void __exit lane_module_cleanup(void)
1218 {
1219 int i;
1220 struct lec_priv *priv;
1221
1222 remove_proc_entry("lec", atm_proc_root);
1223
1224 deregister_atm_ioctl(&lane_ioctl_ops);
1225
1226 for (i = 0; i < MAX_LEC_ITF; i++) {
1227 if (dev_lec[i] != NULL) {
1228 priv = netdev_priv(dev_lec[i]);
1229 unregister_netdev(dev_lec[i]);
1230 free_netdev(dev_lec[i]);
1231 dev_lec[i] = NULL;
1232 }
1233 }
1234
1235 return;
1236 }
1237
1238 module_init(lane_module_init);
1239 module_exit(lane_module_cleanup);
1240
1241 /*
1242 * LANE2: 3.1.3, LE_RESOLVE.request
1243 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1244 * If sizeoftlvs == NULL the default TLVs associated with with this
1245 * lec will be used.
1246 * If dst_mac == NULL, targetless LE_ARP will be sent
1247 */
1248 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1249 u8 **tlvs, u32 *sizeoftlvs)
1250 {
1251 unsigned long flags;
1252 struct lec_priv *priv = netdev_priv(dev);
1253 struct lec_arp_table *table;
1254 struct sk_buff *skb;
1255 int retval;
1256
1257 if (force == 0) {
1258 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1259 table = lec_arp_find(priv, dst_mac);
1260 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1261 if (table == NULL)
1262 return -1;
1263
1264 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1265 if (*tlvs == NULL)
1266 return -1;
1267
1268 *sizeoftlvs = table->sizeoftlvs;
1269
1270 return 0;
1271 }
1272
1273 if (sizeoftlvs == NULL)
1274 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1275
1276 else {
1277 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1278 if (skb == NULL)
1279 return -1;
1280 skb->len = *sizeoftlvs;
1281 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1282 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1283 }
1284 return retval;
1285 }
1286
1287 /*
1288 * LANE2: 3.1.4, LE_ASSOCIATE.request
1289 * Associate the *tlvs with the *lan_dst address.
1290 * Will overwrite any previous association
1291 * Returns 1 for success, 0 for failure (out of memory)
1292 *
1293 */
1294 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1295 const u8 *tlvs, u32 sizeoftlvs)
1296 {
1297 int retval;
1298 struct sk_buff *skb;
1299 struct lec_priv *priv = netdev_priv(dev);
1300
1301 if (compare_ether_addr(lan_dst, dev->dev_addr))
1302 return (0); /* not our mac address */
1303
1304 kfree(priv->tlvs); /* NULL if there was no previous association */
1305
1306 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1307 if (priv->tlvs == NULL)
1308 return (0);
1309 priv->sizeoftlvs = sizeoftlvs;
1310
1311 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1312 if (skb == NULL)
1313 return 0;
1314 skb->len = sizeoftlvs;
1315 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1316 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1317 if (retval != 0)
1318 printk("lec.c: lane2_associate_req() failed\n");
1319 /*
1320 * If the previous association has changed we must
1321 * somehow notify other LANE entities about the change
1322 */
1323 return (1);
1324 }
1325
1326 /*
1327 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1328 *
1329 */
1330 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1331 const u8 *tlvs, u32 sizeoftlvs)
1332 {
1333 #if 0
1334 int i = 0;
1335 #endif
1336 struct lec_priv *priv = netdev_priv(dev);
1337 #if 0 /*
1338 * Why have the TLVs in LE_ARP entries
1339 * since we do not use them? When you
1340 * uncomment this code, make sure the
1341 * TLVs get freed when entry is killed
1342 */
1343 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1344
1345 if (entry == NULL)
1346 return; /* should not happen */
1347
1348 kfree(entry->tlvs);
1349
1350 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1351 if (entry->tlvs == NULL)
1352 return;
1353 entry->sizeoftlvs = sizeoftlvs;
1354 #endif
1355 #if 0
1356 printk("lec.c: lane2_associate_ind()\n");
1357 printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1358 while (i < sizeoftlvs)
1359 printk("%02x ", tlvs[i++]);
1360
1361 printk("\n");
1362 #endif
1363
1364 /* tell MPOA about the TLVs we saw */
1365 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1366 priv->lane2_ops->associate_indicator(dev, mac_addr,
1367 tlvs, sizeoftlvs);
1368 }
1369 return;
1370 }
1371
1372 /*
1373 * Here starts what used to lec_arpc.c
1374 *
1375 * lec_arpc.c was added here when making
1376 * lane client modular. October 1997
1377 */
1378
1379 #include <linux/types.h>
1380 #include <linux/timer.h>
1381 #include <asm/param.h>
1382 #include <asm/atomic.h>
1383 #include <linux/inetdevice.h>
1384 #include <net/route.h>
1385
1386 #if 0
1387 #define pr_debug(format,args...)
1388 /*
1389 #define pr_debug printk
1390 */
1391 #endif
1392 #define DEBUG_ARP_TABLE 0
1393
1394 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1395
1396 static void lec_arp_check_expire(struct work_struct *work);
1397 static void lec_arp_expire_arp(unsigned long data);
1398
1399 /*
1400 * Arp table funcs
1401 */
1402
1403 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1404
1405 /*
1406 * Initialization of arp-cache
1407 */
1408 static void lec_arp_init(struct lec_priv *priv)
1409 {
1410 unsigned short i;
1411
1412 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1413 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1414 }
1415 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1416 INIT_HLIST_HEAD(&priv->lec_no_forward);
1417 INIT_HLIST_HEAD(&priv->mcast_fwds);
1418 spin_lock_init(&priv->lec_arp_lock);
1419 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1420 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1421 }
1422
1423 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1424 {
1425 if (entry->vcc) {
1426 struct atm_vcc *vcc = entry->vcc;
1427 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1428 struct net_device *dev = (struct net_device *)vcc->proto_data;
1429
1430 vcc->pop = vpriv->old_pop;
1431 if (vpriv->xoff)
1432 netif_wake_queue(dev);
1433 kfree(vpriv);
1434 vcc->user_back = NULL;
1435 vcc->push = entry->old_push;
1436 vcc_release_async(vcc, -EPIPE);
1437 entry->vcc = NULL;
1438 }
1439 if (entry->recv_vcc) {
1440 entry->recv_vcc->push = entry->old_recv_push;
1441 vcc_release_async(entry->recv_vcc, -EPIPE);
1442 entry->recv_vcc = NULL;
1443 }
1444 }
1445
1446 /*
1447 * Insert entry to lec_arp_table
1448 * LANE2: Add to the end of the list to satisfy 8.1.13
1449 */
1450 static inline void
1451 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1452 {
1453 struct hlist_head *tmp;
1454
1455 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1456 hlist_add_head(&entry->next, tmp);
1457
1458 pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1459 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1460 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1461 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1462 }
1463
1464 /*
1465 * Remove entry from lec_arp_table
1466 */
1467 static int
1468 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1469 {
1470 struct hlist_node *node;
1471 struct lec_arp_table *entry;
1472 int i, remove_vcc = 1;
1473
1474 if (!to_remove) {
1475 return -1;
1476 }
1477
1478 hlist_del(&to_remove->next);
1479 del_timer(&to_remove->timer);
1480
1481 /* If this is the only MAC connected to this VCC, also tear down the VCC */
1482 if (to_remove->status >= ESI_FLUSH_PENDING) {
1483 /*
1484 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1485 */
1486 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1487 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1488 if (memcmp(to_remove->atm_addr,
1489 entry->atm_addr, ATM_ESA_LEN) == 0) {
1490 remove_vcc = 0;
1491 break;
1492 }
1493 }
1494 }
1495 if (remove_vcc)
1496 lec_arp_clear_vccs(to_remove);
1497 }
1498 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1499
1500 pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1501 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1502 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1503 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1504 return 0;
1505 }
1506
1507 #if DEBUG_ARP_TABLE
1508 static char *get_status_string(unsigned char st)
1509 {
1510 switch (st) {
1511 case ESI_UNKNOWN:
1512 return "ESI_UNKNOWN";
1513 case ESI_ARP_PENDING:
1514 return "ESI_ARP_PENDING";
1515 case ESI_VC_PENDING:
1516 return "ESI_VC_PENDING";
1517 case ESI_FLUSH_PENDING:
1518 return "ESI_FLUSH_PENDING";
1519 case ESI_FORWARD_DIRECT:
1520 return "ESI_FORWARD_DIRECT";
1521 default:
1522 return "<UNKNOWN>";
1523 }
1524 }
1525
1526 static void dump_arp_table(struct lec_priv *priv)
1527 {
1528 struct hlist_node *node;
1529 struct lec_arp_table *rulla;
1530 char buf[256];
1531 int i, j, offset;
1532
1533 printk("Dump %p:\n", priv);
1534 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1535 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1536 offset = 0;
1537 offset += sprintf(buf, "%d: %p\n", i, rulla);
1538 offset += sprintf(buf + offset, "Mac:");
1539 for (j = 0; j < ETH_ALEN; j++) {
1540 offset += sprintf(buf + offset,
1541 "%2.2x ",
1542 rulla->mac_addr[j] & 0xff);
1543 }
1544 offset += sprintf(buf + offset, "Atm:");
1545 for (j = 0; j < ATM_ESA_LEN; j++) {
1546 offset += sprintf(buf + offset,
1547 "%2.2x ",
1548 rulla->atm_addr[j] & 0xff);
1549 }
1550 offset += sprintf(buf + offset,
1551 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1552 rulla->vcc ? rulla->vcc->vpi : 0,
1553 rulla->vcc ? rulla->vcc->vci : 0,
1554 rulla->recv_vcc ? rulla->recv_vcc->
1555 vpi : 0,
1556 rulla->recv_vcc ? rulla->recv_vcc->
1557 vci : 0, rulla->last_used,
1558 rulla->timestamp, rulla->no_tries);
1559 offset +=
1560 sprintf(buf + offset,
1561 "Flags:%x, Packets_flooded:%x, Status: %s ",
1562 rulla->flags, rulla->packets_flooded,
1563 get_status_string(rulla->status));
1564 printk("%s\n", buf);
1565 }
1566 }
1567
1568 if (!hlist_empty(&priv->lec_no_forward))
1569 printk("No forward\n");
1570 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1571 offset = 0;
1572 offset += sprintf(buf + offset, "Mac:");
1573 for (j = 0; j < ETH_ALEN; j++) {
1574 offset += sprintf(buf + offset, "%2.2x ",
1575 rulla->mac_addr[j] & 0xff);
1576 }
1577 offset += sprintf(buf + offset, "Atm:");
1578 for (j = 0; j < ATM_ESA_LEN; j++) {
1579 offset += sprintf(buf + offset, "%2.2x ",
1580 rulla->atm_addr[j] & 0xff);
1581 }
1582 offset += sprintf(buf + offset,
1583 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1584 rulla->vcc ? rulla->vcc->vpi : 0,
1585 rulla->vcc ? rulla->vcc->vci : 0,
1586 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1587 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1588 rulla->last_used,
1589 rulla->timestamp, rulla->no_tries);
1590 offset += sprintf(buf + offset,
1591 "Flags:%x, Packets_flooded:%x, Status: %s ",
1592 rulla->flags, rulla->packets_flooded,
1593 get_status_string(rulla->status));
1594 printk("%s\n", buf);
1595 }
1596
1597 if (!hlist_empty(&priv->lec_arp_empty_ones))
1598 printk("Empty ones\n");
1599 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1600 offset = 0;
1601 offset += sprintf(buf + offset, "Mac:");
1602 for (j = 0; j < ETH_ALEN; j++) {
1603 offset += sprintf(buf + offset, "%2.2x ",
1604 rulla->mac_addr[j] & 0xff);
1605 }
1606 offset += sprintf(buf + offset, "Atm:");
1607 for (j = 0; j < ATM_ESA_LEN; j++) {
1608 offset += sprintf(buf + offset, "%2.2x ",
1609 rulla->atm_addr[j] & 0xff);
1610 }
1611 offset += sprintf(buf + offset,
1612 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1613 rulla->vcc ? rulla->vcc->vpi : 0,
1614 rulla->vcc ? rulla->vcc->vci : 0,
1615 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1616 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1617 rulla->last_used,
1618 rulla->timestamp, rulla->no_tries);
1619 offset += sprintf(buf + offset,
1620 "Flags:%x, Packets_flooded:%x, Status: %s ",
1621 rulla->flags, rulla->packets_flooded,
1622 get_status_string(rulla->status));
1623 printk("%s", buf);
1624 }
1625
1626 if (!hlist_empty(&priv->mcast_fwds))
1627 printk("Multicast Forward VCCs\n");
1628 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1629 offset = 0;
1630 offset += sprintf(buf + offset, "Mac:");
1631 for (j = 0; j < ETH_ALEN; j++) {
1632 offset += sprintf(buf + offset, "%2.2x ",
1633 rulla->mac_addr[j] & 0xff);
1634 }
1635 offset += sprintf(buf + offset, "Atm:");
1636 for (j = 0; j < ATM_ESA_LEN; j++) {
1637 offset += sprintf(buf + offset, "%2.2x ",
1638 rulla->atm_addr[j] & 0xff);
1639 }
1640 offset += sprintf(buf + offset,
1641 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1642 rulla->vcc ? rulla->vcc->vpi : 0,
1643 rulla->vcc ? rulla->vcc->vci : 0,
1644 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1645 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1646 rulla->last_used,
1647 rulla->timestamp, rulla->no_tries);
1648 offset += sprintf(buf + offset,
1649 "Flags:%x, Packets_flooded:%x, Status: %s ",
1650 rulla->flags, rulla->packets_flooded,
1651 get_status_string(rulla->status));
1652 printk("%s\n", buf);
1653 }
1654
1655 }
1656 #else
1657 #define dump_arp_table(priv) do { } while (0)
1658 #endif
1659
1660 /*
1661 * Destruction of arp-cache
1662 */
1663 static void lec_arp_destroy(struct lec_priv *priv)
1664 {
1665 unsigned long flags;
1666 struct hlist_node *node, *next;
1667 struct lec_arp_table *entry;
1668 int i;
1669
1670 cancel_rearming_delayed_work(&priv->lec_arp_work);
1671
1672 /*
1673 * Remove all entries
1674 */
1675
1676 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1677 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1678 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1679 lec_arp_remove(priv, entry);
1680 lec_arp_put(entry);
1681 }
1682 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1683 }
1684
1685 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1686 del_timer_sync(&entry->timer);
1687 lec_arp_clear_vccs(entry);
1688 hlist_del(&entry->next);
1689 lec_arp_put(entry);
1690 }
1691 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1692
1693 hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1694 del_timer_sync(&entry->timer);
1695 lec_arp_clear_vccs(entry);
1696 hlist_del(&entry->next);
1697 lec_arp_put(entry);
1698 }
1699 INIT_HLIST_HEAD(&priv->lec_no_forward);
1700
1701 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1702 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1703 lec_arp_clear_vccs(entry);
1704 hlist_del(&entry->next);
1705 lec_arp_put(entry);
1706 }
1707 INIT_HLIST_HEAD(&priv->mcast_fwds);
1708 priv->mcast_vcc = NULL;
1709 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1710 }
1711
1712 /*
1713 * Find entry by mac_address
1714 */
1715 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1716 const unsigned char *mac_addr)
1717 {
1718 struct hlist_node *node;
1719 struct hlist_head *head;
1720 struct lec_arp_table *entry;
1721
1722 pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1723 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1724 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1725
1726 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1727 hlist_for_each_entry(entry, node, head, next) {
1728 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1729 return entry;
1730 }
1731 }
1732 return NULL;
1733 }
1734
1735 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1736 const unsigned char *mac_addr)
1737 {
1738 struct lec_arp_table *to_return;
1739
1740 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1741 if (!to_return) {
1742 printk("LEC: Arp entry kmalloc failed\n");
1743 return NULL;
1744 }
1745 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1746 INIT_HLIST_NODE(&to_return->next);
1747 setup_timer(&to_return->timer, lec_arp_expire_arp,
1748 (unsigned long)to_return);
1749 to_return->last_used = jiffies;
1750 to_return->priv = priv;
1751 skb_queue_head_init(&to_return->tx_wait);
1752 atomic_set(&to_return->usage, 1);
1753 return to_return;
1754 }
1755
1756 /* Arp sent timer expired */
1757 static void lec_arp_expire_arp(unsigned long data)
1758 {
1759 struct lec_arp_table *entry;
1760
1761 entry = (struct lec_arp_table *)data;
1762
1763 pr_debug("lec_arp_expire_arp\n");
1764 if (entry->status == ESI_ARP_PENDING) {
1765 if (entry->no_tries <= entry->priv->max_retry_count) {
1766 if (entry->is_rdesc)
1767 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1768 entry->mac_addr, NULL, NULL);
1769 else
1770 send_to_lecd(entry->priv, l_arp_xmt,
1771 entry->mac_addr, NULL, NULL);
1772 entry->no_tries++;
1773 }
1774 mod_timer(&entry->timer, jiffies + (1 * HZ));
1775 }
1776 }
1777
1778 /* Unknown/unused vcc expire, remove associated entry */
1779 static void lec_arp_expire_vcc(unsigned long data)
1780 {
1781 unsigned long flags;
1782 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1783 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1784
1785 del_timer(&to_remove->timer);
1786
1787 pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1788 to_remove, priv,
1789 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1790 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1791
1792 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1793 hlist_del(&to_remove->next);
1794 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1795
1796 lec_arp_clear_vccs(to_remove);
1797 lec_arp_put(to_remove);
1798 }
1799
1800 /*
1801 * Expire entries.
1802 * 1. Re-set timer
1803 * 2. For each entry, delete entries that have aged past the age limit.
1804 * 3. For each entry, depending on the status of the entry, perform
1805 * the following maintenance.
1806 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1807 * tick_count is above the max_unknown_frame_time, clear
1808 * the tick_count to zero and clear the packets_flooded counter
1809 * to zero. This supports the packet rate limit per address
1810 * while flooding unknowns.
1811 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1812 * than or equal to the path_switching_delay, change the status
1813 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1814 * regardless of the progress of the flush protocol.
1815 */
1816 static void lec_arp_check_expire(struct work_struct *work)
1817 {
1818 unsigned long flags;
1819 struct lec_priv *priv =
1820 container_of(work, struct lec_priv, lec_arp_work.work);
1821 struct hlist_node *node, *next;
1822 struct lec_arp_table *entry;
1823 unsigned long now;
1824 unsigned long time_to_check;
1825 int i;
1826
1827 pr_debug("lec_arp_check_expire %p\n", priv);
1828 now = jiffies;
1829 restart:
1830 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1831 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1832 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1833 if ((entry->flags) & LEC_REMOTE_FLAG &&
1834 priv->topology_change)
1835 time_to_check = priv->forward_delay_time;
1836 else
1837 time_to_check = priv->aging_time;
1838
1839 pr_debug("About to expire: %lx - %lx > %lx\n",
1840 now, entry->last_used, time_to_check);
1841 if (time_after(now, entry->last_used + time_to_check)
1842 && !(entry->flags & LEC_PERMANENT_FLAG)
1843 && !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1844 /* Remove entry */
1845 pr_debug("LEC:Entry timed out\n");
1846 lec_arp_remove(priv, entry);
1847 lec_arp_put(entry);
1848 } else {
1849 /* Something else */
1850 if ((entry->status == ESI_VC_PENDING ||
1851 entry->status == ESI_ARP_PENDING)
1852 && time_after_eq(now,
1853 entry->timestamp +
1854 priv->
1855 max_unknown_frame_time)) {
1856 entry->timestamp = jiffies;
1857 entry->packets_flooded = 0;
1858 if (entry->status == ESI_VC_PENDING)
1859 send_to_lecd(priv, l_svc_setup,
1860 entry->mac_addr,
1861 entry->atm_addr,
1862 NULL);
1863 }
1864 if (entry->status == ESI_FLUSH_PENDING
1865 &&
1866 time_after_eq(now, entry->timestamp +
1867 priv->path_switching_delay)) {
1868 struct sk_buff *skb;
1869 struct atm_vcc *vcc = entry->vcc;
1870
1871 lec_arp_hold(entry);
1872 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1873 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1874 lec_send(vcc, skb);
1875 entry->last_used = jiffies;
1876 entry->status = ESI_FORWARD_DIRECT;
1877 lec_arp_put(entry);
1878 goto restart;
1879 }
1880 }
1881 }
1882 }
1883 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1884
1885 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1886 }
1887
1888 /*
1889 * Try to find vcc where mac_address is attached.
1890 *
1891 */
1892 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1893 const unsigned char *mac_to_find, int is_rdesc,
1894 struct lec_arp_table **ret_entry)
1895 {
1896 unsigned long flags;
1897 struct lec_arp_table *entry;
1898 struct atm_vcc *found;
1899
1900 if (mac_to_find[0] & 0x01) {
1901 switch (priv->lane_version) {
1902 case 1:
1903 return priv->mcast_vcc;
1904 case 2: /* LANE2 wants arp for multicast addresses */
1905 if (!compare_ether_addr(mac_to_find, bus_mac))
1906 return priv->mcast_vcc;
1907 break;
1908 default:
1909 break;
1910 }
1911 }
1912
1913 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1914 entry = lec_arp_find(priv, mac_to_find);
1915
1916 if (entry) {
1917 if (entry->status == ESI_FORWARD_DIRECT) {
1918 /* Connection Ok */
1919 entry->last_used = jiffies;
1920 lec_arp_hold(entry);
1921 *ret_entry = entry;
1922 found = entry->vcc;
1923 goto out;
1924 }
1925 /*
1926 * If the LE_ARP cache entry is still pending, reset count to 0
1927 * so another LE_ARP request can be made for this frame.
1928 */
1929 if (entry->status == ESI_ARP_PENDING) {
1930 entry->no_tries = 0;
1931 }
1932 /*
1933 * Data direct VC not yet set up, check to see if the unknown
1934 * frame count is greater than the limit. If the limit has
1935 * not been reached, allow the caller to send packet to
1936 * BUS.
1937 */
1938 if (entry->status != ESI_FLUSH_PENDING &&
1939 entry->packets_flooded <
1940 priv->maximum_unknown_frame_count) {
1941 entry->packets_flooded++;
1942 pr_debug("LEC_ARP: Flooding..\n");
1943 found = priv->mcast_vcc;
1944 goto out;
1945 }
1946 /*
1947 * We got here because entry->status == ESI_FLUSH_PENDING
1948 * or BUS flood limit was reached for an entry which is
1949 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1950 */
1951 lec_arp_hold(entry);
1952 *ret_entry = entry;
1953 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1954 entry->vcc);
1955 found = NULL;
1956 } else {
1957 /* No matching entry was found */
1958 entry = make_entry(priv, mac_to_find);
1959 pr_debug("LEC_ARP: Making entry\n");
1960 if (!entry) {
1961 found = priv->mcast_vcc;
1962 goto out;
1963 }
1964 lec_arp_add(priv, entry);
1965 /* We want arp-request(s) to be sent */
1966 entry->packets_flooded = 1;
1967 entry->status = ESI_ARP_PENDING;
1968 entry->no_tries = 1;
1969 entry->last_used = entry->timestamp = jiffies;
1970 entry->is_rdesc = is_rdesc;
1971 if (entry->is_rdesc)
1972 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1973 NULL);
1974 else
1975 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1976 entry->timer.expires = jiffies + (1 * HZ);
1977 entry->timer.function = lec_arp_expire_arp;
1978 add_timer(&entry->timer);
1979 found = priv->mcast_vcc;
1980 }
1981
1982 out:
1983 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1984 return found;
1985 }
1986
1987 static int
1988 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1989 unsigned long permanent)
1990 {
1991 unsigned long flags;
1992 struct hlist_node *node, *next;
1993 struct lec_arp_table *entry;
1994 int i;
1995
1996 pr_debug("lec_addr_delete\n");
1997 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1998 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1999 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2000 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2001 && (permanent ||
2002 !(entry->flags & LEC_PERMANENT_FLAG))) {
2003 lec_arp_remove(priv, entry);
2004 lec_arp_put(entry);
2005 }
2006 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2007 return 0;
2008 }
2009 }
2010 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2011 return -1;
2012 }
2013
2014 /*
2015 * Notifies: Response to arp_request (atm_addr != NULL)
2016 */
2017 static void
2018 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2019 const unsigned char *atm_addr, unsigned long remoteflag,
2020 unsigned int targetless_le_arp)
2021 {
2022 unsigned long flags;
2023 struct hlist_node *node, *next;
2024 struct lec_arp_table *entry, *tmp;
2025 int i;
2026
2027 pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2028 pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2029 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2030 mac_addr[4], mac_addr[5]);
2031
2032 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2033 entry = lec_arp_find(priv, mac_addr);
2034 if (entry == NULL && targetless_le_arp)
2035 goto out; /*
2036 * LANE2: ignore targetless LE_ARPs for which
2037 * we have no entry in the cache. 7.1.30
2038 */
2039 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2040 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2041 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2042 hlist_del(&entry->next);
2043 del_timer(&entry->timer);
2044 tmp = lec_arp_find(priv, mac_addr);
2045 if (tmp) {
2046 del_timer(&tmp->timer);
2047 tmp->status = ESI_FORWARD_DIRECT;
2048 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2049 tmp->vcc = entry->vcc;
2050 tmp->old_push = entry->old_push;
2051 tmp->last_used = jiffies;
2052 del_timer(&entry->timer);
2053 lec_arp_put(entry);
2054 entry = tmp;
2055 } else {
2056 entry->status = ESI_FORWARD_DIRECT;
2057 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2058 entry->last_used = jiffies;
2059 lec_arp_add(priv, entry);
2060 }
2061 if (remoteflag)
2062 entry->flags |= LEC_REMOTE_FLAG;
2063 else
2064 entry->flags &= ~LEC_REMOTE_FLAG;
2065 pr_debug("After update\n");
2066 dump_arp_table(priv);
2067 goto out;
2068 }
2069 }
2070 }
2071
2072 entry = lec_arp_find(priv, mac_addr);
2073 if (!entry) {
2074 entry = make_entry(priv, mac_addr);
2075 if (!entry)
2076 goto out;
2077 entry->status = ESI_UNKNOWN;
2078 lec_arp_add(priv, entry);
2079 /* Temporary, changes before end of function */
2080 }
2081 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2082 del_timer(&entry->timer);
2083 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2084 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2085 if (entry != tmp &&
2086 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2087 /* Vcc to this host exists */
2088 if (tmp->status > ESI_VC_PENDING) {
2089 /*
2090 * ESI_FLUSH_PENDING,
2091 * ESI_FORWARD_DIRECT
2092 */
2093 entry->vcc = tmp->vcc;
2094 entry->old_push = tmp->old_push;
2095 }
2096 entry->status = tmp->status;
2097 break;
2098 }
2099 }
2100 }
2101 if (remoteflag)
2102 entry->flags |= LEC_REMOTE_FLAG;
2103 else
2104 entry->flags &= ~LEC_REMOTE_FLAG;
2105 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2106 entry->status = ESI_VC_PENDING;
2107 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2108 }
2109 pr_debug("After update2\n");
2110 dump_arp_table(priv);
2111 out:
2112 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2113 }
2114
2115 /*
2116 * Notifies: Vcc setup ready
2117 */
2118 static void
2119 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2120 struct atm_vcc *vcc,
2121 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2122 {
2123 unsigned long flags;
2124 struct hlist_node *node;
2125 struct lec_arp_table *entry;
2126 int i, found_entry = 0;
2127
2128 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2129 if (ioc_data->receive == 2) {
2130 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2131
2132 pr_debug("LEC_ARP: Attaching mcast forward\n");
2133 #if 0
2134 entry = lec_arp_find(priv, bus_mac);
2135 if (!entry) {
2136 printk("LEC_ARP: Multicast entry not found!\n");
2137 goto out;
2138 }
2139 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2140 entry->recv_vcc = vcc;
2141 entry->old_recv_push = old_push;
2142 #endif
2143 entry = make_entry(priv, bus_mac);
2144 if (entry == NULL)
2145 goto out;
2146 del_timer(&entry->timer);
2147 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2148 entry->recv_vcc = vcc;
2149 entry->old_recv_push = old_push;
2150 hlist_add_head(&entry->next, &priv->mcast_fwds);
2151 goto out;
2152 } else if (ioc_data->receive == 1) {
2153 /*
2154 * Vcc which we don't want to make default vcc,
2155 * attach it anyway.
2156 */
2157 pr_debug
2158 ("LEC_ARP:Attaching data direct, not default: "
2159 "%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",
2160 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2161 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2162 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2163 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2164 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2165 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2166 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2167 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2168 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2169 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2170 entry = make_entry(priv, bus_mac);
2171 if (entry == NULL)
2172 goto out;
2173 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2174 memset(entry->mac_addr, 0, ETH_ALEN);
2175 entry->recv_vcc = vcc;
2176 entry->old_recv_push = old_push;
2177 entry->status = ESI_UNKNOWN;
2178 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2179 entry->timer.function = lec_arp_expire_vcc;
2180 hlist_add_head(&entry->next, &priv->lec_no_forward);
2181 add_timer(&entry->timer);
2182 dump_arp_table(priv);
2183 goto out;
2184 }
2185 pr_debug
2186 ("LEC_ARP:Attaching data direct, default: "
2187 "%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",
2188 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2189 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2190 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2191 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2192 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2193 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2194 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2195 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2196 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2197 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2198 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2199 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2200 if (memcmp
2201 (ioc_data->atm_addr, entry->atm_addr,
2202 ATM_ESA_LEN) == 0) {
2203 pr_debug("LEC_ARP: Attaching data direct\n");
2204 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2205 entry->vcc ? entry->vcc->vci : 0,
2206 entry->recv_vcc ? entry->recv_vcc->
2207 vci : 0);
2208 found_entry = 1;
2209 del_timer(&entry->timer);
2210 entry->vcc = vcc;
2211 entry->old_push = old_push;
2212 if (entry->status == ESI_VC_PENDING) {
2213 if (priv->maximum_unknown_frame_count
2214 == 0)
2215 entry->status =
2216 ESI_FORWARD_DIRECT;
2217 else {
2218 entry->timestamp = jiffies;
2219 entry->status =
2220 ESI_FLUSH_PENDING;
2221 #if 0
2222 send_to_lecd(priv, l_flush_xmt,
2223 NULL,
2224 entry->atm_addr,
2225 NULL);
2226 #endif
2227 }
2228 } else {
2229 /*
2230 * They were forming a connection
2231 * to us, and we to them. Our
2232 * ATM address is numerically lower
2233 * than theirs, so we make connection
2234 * we formed into default VCC (8.1.11).
2235 * Connection they made gets torn
2236 * down. This might confuse some
2237 * clients. Can be changed if
2238 * someone reports trouble...
2239 */
2240 ;
2241 }
2242 }
2243 }
2244 }
2245 if (found_entry) {
2246 pr_debug("After vcc was added\n");
2247 dump_arp_table(priv);
2248 goto out;
2249 }
2250 /*
2251 * Not found, snatch address from first data packet that arrives
2252 * from this vcc
2253 */
2254 entry = make_entry(priv, bus_mac);
2255 if (!entry)
2256 goto out;
2257 entry->vcc = vcc;
2258 entry->old_push = old_push;
2259 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2260 memset(entry->mac_addr, 0, ETH_ALEN);
2261 entry->status = ESI_UNKNOWN;
2262 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2263 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2264 entry->timer.function = lec_arp_expire_vcc;
2265 add_timer(&entry->timer);
2266 pr_debug("After vcc was added\n");
2267 dump_arp_table(priv);
2268 out:
2269 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270 }
2271
2272 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2273 {
2274 unsigned long flags;
2275 struct hlist_node *node;
2276 struct lec_arp_table *entry;
2277 int i;
2278
2279 pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2280 restart:
2281 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2282 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2283 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2284 if (entry->flush_tran_id == tran_id
2285 && entry->status == ESI_FLUSH_PENDING) {
2286 struct sk_buff *skb;
2287 struct atm_vcc *vcc = entry->vcc;
2288
2289 lec_arp_hold(entry);
2290 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2291 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2292 lec_send(vcc, skb);
2293 entry->last_used = jiffies;
2294 entry->status = ESI_FORWARD_DIRECT;
2295 lec_arp_put(entry);
2296 pr_debug("LEC_ARP: Flushed\n");
2297 goto restart;
2298 }
2299 }
2300 }
2301 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2302 dump_arp_table(priv);
2303 }
2304
2305 static void
2306 lec_set_flush_tran_id(struct lec_priv *priv,
2307 const unsigned char *atm_addr, unsigned long tran_id)
2308 {
2309 unsigned long flags;
2310 struct hlist_node *node;
2311 struct lec_arp_table *entry;
2312 int i;
2313
2314 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2315 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2316 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2317 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2318 entry->flush_tran_id = tran_id;
2319 pr_debug("Set flush transaction id to %lx for %p\n",
2320 tran_id, entry);
2321 }
2322 }
2323 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2324 }
2325
2326 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2327 {
2328 unsigned long flags;
2329 unsigned char mac_addr[] = {
2330 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2331 };
2332 struct lec_arp_table *to_add;
2333 struct lec_vcc_priv *vpriv;
2334 int err = 0;
2335
2336 if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2337 return -ENOMEM;
2338 vpriv->xoff = 0;
2339 vpriv->old_pop = vcc->pop;
2340 vcc->user_back = vpriv;
2341 vcc->pop = lec_pop;
2342 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2343 to_add = make_entry(priv, mac_addr);
2344 if (!to_add) {
2345 vcc->pop = vpriv->old_pop;
2346 kfree(vpriv);
2347 err = -ENOMEM;
2348 goto out;
2349 }
2350 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2351 to_add->status = ESI_FORWARD_DIRECT;
2352 to_add->flags |= LEC_PERMANENT_FLAG;
2353 to_add->vcc = vcc;
2354 to_add->old_push = vcc->push;
2355 vcc->push = lec_push;
2356 priv->mcast_vcc = vcc;
2357 lec_arp_add(priv, to_add);
2358 out:
2359 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2360 return err;
2361 }
2362
2363 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2364 {
2365 unsigned long flags;
2366 struct hlist_node *node, *next;
2367 struct lec_arp_table *entry;
2368 int i;
2369
2370 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2371 dump_arp_table(priv);
2372
2373 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2374
2375 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2376 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2377 if (vcc == entry->vcc) {
2378 lec_arp_remove(priv, entry);
2379 lec_arp_put(entry);
2380 if (priv->mcast_vcc == vcc) {
2381 priv->mcast_vcc = NULL;
2382 }
2383 }
2384 }
2385 }
2386
2387 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2388 if (entry->vcc == vcc) {
2389 lec_arp_clear_vccs(entry);
2390 del_timer(&entry->timer);
2391 hlist_del(&entry->next);
2392 lec_arp_put(entry);
2393 }
2394 }
2395
2396 hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2397 if (entry->recv_vcc == vcc) {
2398 lec_arp_clear_vccs(entry);
2399 del_timer(&entry->timer);
2400 hlist_del(&entry->next);
2401 lec_arp_put(entry);
2402 }
2403 }
2404
2405 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2406 if (entry->recv_vcc == vcc) {
2407 lec_arp_clear_vccs(entry);
2408 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2409 hlist_del(&entry->next);
2410 lec_arp_put(entry);
2411 }
2412 }
2413
2414 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2415 dump_arp_table(priv);
2416 }
2417
2418 static void
2419 lec_arp_check_empties(struct lec_priv *priv,
2420 struct atm_vcc *vcc, struct sk_buff *skb)
2421 {
2422 unsigned long flags;
2423 struct hlist_node *node, *next;
2424 struct lec_arp_table *entry, *tmp;
2425 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2426 unsigned char *src;
2427 #ifdef CONFIG_TR
2428 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2429
2430 if (priv->is_trdev)
2431 src = tr_hdr->h_source;
2432 else
2433 #endif
2434 src = hdr->h_source;
2435
2436 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2437 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2438 if (vcc == entry->vcc) {
2439 del_timer(&entry->timer);
2440 memcpy(entry->mac_addr, src, ETH_ALEN);
2441 entry->status = ESI_FORWARD_DIRECT;
2442 entry->last_used = jiffies;
2443 /* We might have got an entry */
2444 if ((tmp = lec_arp_find(priv, src))) {
2445 lec_arp_remove(priv, tmp);
2446 lec_arp_put(tmp);
2447 }
2448 hlist_del(&entry->next);
2449 lec_arp_add(priv, entry);
2450 goto out;
2451 }
2452 }
2453 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2454 out:
2455 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2456 }
2457
2458 MODULE_LICENSE("GPL");
Linux with added FPC-III support