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Merge git://git.infradead.org/mtd-2.6
[linux-2.6/next.git] / net / atm / lec.c
blob199b6bb79f429aadeaf6a26ad6c3b65d200d1644
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 <linux/if_bridge.h>
38 #include "../bridge/br_private.h"
39
40 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
41 #endif
42
43 /* Modular too */
44 #include <linux/module.h>
45 #include <linux/init.h>
46
47 #include "lec.h"
48 #include "lec_arpc.h"
49 #include "resources.h"
50
51 #define DUMP_PACKETS 0 /*
52 * 0 = None,
53 * 1 = 30 first bytes
54 * 2 = Whole packet
55 */
56
57 #define LEC_UNRES_QUE_LEN 8 /*
58 * number of tx packets to queue for a
59 * single destination while waiting for SVC
60 */
61
62 static int lec_open(struct net_device *dev);
63 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
64 static int lec_close(struct net_device *dev);
65 static void lec_init(struct net_device *dev);
66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
67 const unsigned char *mac_addr);
68 static int lec_arp_remove(struct lec_priv *priv,
69 struct lec_arp_table *to_remove);
70 /* LANE2 functions */
71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
72 const u8 *tlvs, u32 sizeoftlvs);
73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
74 u8 **tlvs, u32 *sizeoftlvs);
75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
76 const u8 *tlvs, u32 sizeoftlvs);
77
78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
79 unsigned long permanent);
80 static void lec_arp_check_empties(struct lec_priv *priv,
81 struct atm_vcc *vcc, struct sk_buff *skb);
82 static void lec_arp_destroy(struct lec_priv *priv);
83 static void lec_arp_init(struct lec_priv *priv);
84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
85 const unsigned char *mac_to_find,
86 int is_rdesc,
87 struct lec_arp_table **ret_entry);
88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
89 const unsigned char *atm_addr, unsigned long remoteflag,
90 unsigned int targetless_le_arp);
91 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
92 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
93 static void lec_set_flush_tran_id(struct lec_priv *priv,
94 const unsigned char *atm_addr,
95 unsigned long tran_id);
96 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
97 struct atm_vcc *vcc,
98 void (*old_push) (struct atm_vcc *vcc,
99 struct sk_buff *skb));
100 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
101
102 /* must be done under lec_arp_lock */
103 static inline void lec_arp_hold(struct lec_arp_table *entry)
104 {
105 atomic_inc(&entry->usage);
106 }
107
108 static inline void lec_arp_put(struct lec_arp_table *entry)
109 {
110 if (atomic_dec_and_test(&entry->usage))
111 kfree(entry);
112 }
113
114
115 static struct lane2_ops lane2_ops = {
116 lane2_resolve, /* resolve, spec 3.1.3 */
117 lane2_associate_req, /* associate_req, spec 3.1.4 */
118 NULL /* associate indicator, spec 3.1.5 */
119 };
120
121 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
122
123 /* Device structures */
124 static struct net_device *dev_lec[MAX_LEC_ITF];
125
126 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
127 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
128 {
129 struct ethhdr *eth;
130 char *buff;
131 struct lec_priv *priv;
132
133 /*
134 * Check if this is a BPDU. If so, ask zeppelin to send
135 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
136 * as the Config BPDU has
137 */
138 eth = (struct ethhdr *)skb->data;
139 buff = skb->data + skb->dev->hard_header_len;
140 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
141 struct sock *sk;
142 struct sk_buff *skb2;
143 struct atmlec_msg *mesg;
144
145 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
146 if (skb2 == NULL)
147 return;
148 skb2->len = sizeof(struct atmlec_msg);
149 mesg = (struct atmlec_msg *)skb2->data;
150 mesg->type = l_topology_change;
151 buff += 4;
152 mesg->content.normal.flag = *buff & 0x01; /* 0x01 is topology change */
153
154 priv = netdev_priv(dev);
155 atm_force_charge(priv->lecd, skb2->truesize);
156 sk = sk_atm(priv->lecd);
157 skb_queue_tail(&sk->sk_receive_queue, skb2);
158 sk->sk_data_ready(sk, skb2->len);
159 }
160
161 return;
162 }
163 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
164
165 /*
166 * Modelled after tr_type_trans
167 * All multicast and ARE or STE frames go to BUS.
168 * Non source routed frames go by destination address.
169 * Last hop source routed frames go by destination address.
170 * Not last hop source routed frames go by _next_ route descriptor.
171 * Returns pointer to destination MAC address or fills in rdesc
172 * and returns NULL.
173 */
174 #ifdef CONFIG_TR
175 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
176 {
177 struct trh_hdr *trh;
178 unsigned int riflen, num_rdsc;
179
180 trh = (struct trh_hdr *)packet;
181 if (trh->daddr[0] & (uint8_t) 0x80)
182 return bus_mac; /* multicast */
183
184 if (trh->saddr[0] & TR_RII) {
185 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
186 if ((ntohs(trh->rcf) >> 13) != 0)
187 return bus_mac; /* ARE or STE */
188 } else
189 return trh->daddr; /* not source routed */
190
191 if (riflen < 6)
192 return trh->daddr; /* last hop, source routed */
193
194 /* riflen is 6 or more, packet has more than one route descriptor */
195 num_rdsc = (riflen / 2) - 1;
196 memset(rdesc, 0, ETH_ALEN);
197 /* offset 4 comes from LAN destination field in LE control frames */
198 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
199 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
200 else {
201 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
202 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
203 }
204
205 return NULL;
206 }
207 #endif /* CONFIG_TR */
208
209 /*
210 * Open/initialize the netdevice. This is called (in the current kernel)
211 * sometime after booting when the 'ifconfig' program is run.
212 *
213 * This routine should set everything up anew at each open, even
214 * registers that "should" only need to be set once at boot, so that
215 * there is non-reboot way to recover if something goes wrong.
216 */
217
218 static int lec_open(struct net_device *dev)
219 {
220 netif_start_queue(dev);
221 memset(&dev->stats, 0, sizeof(struct net_device_stats));
222
223 return 0;
224 }
225
226 static void
227 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
228 {
229 struct net_device *dev = skb->dev;
230
231 ATM_SKB(skb)->vcc = vcc;
232 ATM_SKB(skb)->atm_options = vcc->atm_options;
233
234 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
235 if (vcc->send(vcc, skb) < 0) {
236 dev->stats.tx_dropped++;
237 return;
238 }
239
240 dev->stats.tx_packets++;
241 dev->stats.tx_bytes += skb->len;
242 }
243
244 static void lec_tx_timeout(struct net_device *dev)
245 {
246 printk(KERN_INFO "%s: tx timeout\n", dev->name);
247 dev->trans_start = jiffies;
248 netif_wake_queue(dev);
249 }
250
251 static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
252 {
253 struct sk_buff *skb2;
254 struct lec_priv *priv = netdev_priv(dev);
255 struct lecdatahdr_8023 *lec_h;
256 struct atm_vcc *vcc;
257 struct lec_arp_table *entry;
258 unsigned char *dst;
259 int min_frame_size;
260 #ifdef CONFIG_TR
261 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */
262 #endif
263 int is_rdesc;
264 #if DUMP_PACKETS > 0
265 char buf[300];
266 int i = 0;
267 #endif /* DUMP_PACKETS >0 */
268
269 pr_debug("lec_start_xmit called\n");
270 if (!priv->lecd) {
271 printk("%s:No lecd attached\n", dev->name);
272 dev->stats.tx_errors++;
273 netif_stop_queue(dev);
274 return -EUNATCH;
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 struct net_bridge_fdb_entry *f;
522
523 pr_debug("%s: bridge zeppelin asks about %pM\n",
524 dev->name, mesg->content.proxy.mac_addr);
525
526 if (br_fdb_get_hook == NULL || dev->br_port == NULL)
527 break;
528
529 f = br_fdb_get_hook(dev->br_port->br,
530 mesg->content.proxy.mac_addr);
531 if (f != NULL && f->dst->dev != dev
532 && f->dst->state == BR_STATE_FORWARDING) {
533 /* hit from bridge table, send LE_ARP_RESPONSE */
534 struct sk_buff *skb2;
535 struct sock *sk;
536
537 pr_debug
538 ("%s: entry found, responding to zeppelin\n",
539 dev->name);
540 skb2 =
541 alloc_skb(sizeof(struct atmlec_msg),
542 GFP_ATOMIC);
543 if (skb2 == NULL) {
544 br_fdb_put_hook(f);
545 break;
546 }
547 skb2->len = sizeof(struct atmlec_msg);
548 skb_copy_to_linear_data(skb2, mesg,
549 sizeof(*mesg));
550 atm_force_charge(priv->lecd, skb2->truesize);
551 sk = sk_atm(priv->lecd);
552 skb_queue_tail(&sk->sk_receive_queue, skb2);
553 sk->sk_data_ready(sk, skb2->len);
554 }
555 if (f != NULL)
556 br_fdb_put_hook(f);
557 }
558 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
559 break;
560 default:
561 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
562 dev_kfree_skb(skb);
563 return -EINVAL;
564 }
565 dev_kfree_skb(skb);
566 return 0;
567 }
568
569 static void lec_atm_close(struct atm_vcc *vcc)
570 {
571 struct sk_buff *skb;
572 struct net_device *dev = (struct net_device *)vcc->proto_data;
573 struct lec_priv *priv = netdev_priv(dev);
574
575 priv->lecd = NULL;
576 /* Do something needful? */
577
578 netif_stop_queue(dev);
579 lec_arp_destroy(priv);
580
581 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
582 printk("%s lec_atm_close: closing with messages pending\n",
583 dev->name);
584 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
585 atm_return(vcc, skb->truesize);
586 dev_kfree_skb(skb);
587 }
588
589 printk("%s: Shut down!\n", dev->name);
590 module_put(THIS_MODULE);
591 }
592
593 static struct atmdev_ops lecdev_ops = {
594 .close = lec_atm_close,
595 .send = lec_atm_send
596 };
597
598 static struct atm_dev lecatm_dev = {
599 .ops = &lecdev_ops,
600 .type = "lec",
601 .number = 999, /* dummy device number */
602 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
603 };
604
605 /*
606 * LANE2: new argument struct sk_buff *data contains
607 * the LE_ARP based TLVs introduced in the LANE2 spec
608 */
609 static int
610 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
611 const unsigned char *mac_addr, const unsigned char *atm_addr,
612 struct sk_buff *data)
613 {
614 struct sock *sk;
615 struct sk_buff *skb;
616 struct atmlec_msg *mesg;
617
618 if (!priv || !priv->lecd) {
619 return -1;
620 }
621 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
622 if (!skb)
623 return -1;
624 skb->len = sizeof(struct atmlec_msg);
625 mesg = (struct atmlec_msg *)skb->data;
626 memset(mesg, 0, sizeof(struct atmlec_msg));
627 mesg->type = type;
628 if (data != NULL)
629 mesg->sizeoftlvs = data->len;
630 if (mac_addr)
631 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
632 else
633 mesg->content.normal.targetless_le_arp = 1;
634 if (atm_addr)
635 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
636
637 atm_force_charge(priv->lecd, skb->truesize);
638 sk = sk_atm(priv->lecd);
639 skb_queue_tail(&sk->sk_receive_queue, skb);
640 sk->sk_data_ready(sk, skb->len);
641
642 if (data != NULL) {
643 pr_debug("lec: about to send %d bytes of data\n", data->len);
644 atm_force_charge(priv->lecd, data->truesize);
645 skb_queue_tail(&sk->sk_receive_queue, data);
646 sk->sk_data_ready(sk, skb->len);
647 }
648
649 return 0;
650 }
651
652 /* shamelessly stolen from drivers/net/net_init.c */
653 static int lec_change_mtu(struct net_device *dev, int new_mtu)
654 {
655 if ((new_mtu < 68) || (new_mtu > 18190))
656 return -EINVAL;
657 dev->mtu = new_mtu;
658 return 0;
659 }
660
661 static void lec_set_multicast_list(struct net_device *dev)
662 {
663 /*
664 * by default, all multicast frames arrive over the bus.
665 * eventually support selective multicast service
666 */
667 return;
668 }
669
670 static const struct net_device_ops lec_netdev_ops = {
671 .ndo_open = lec_open,
672 .ndo_stop = lec_close,
673 .ndo_start_xmit = lec_start_xmit,
674 .ndo_change_mtu = lec_change_mtu,
675 .ndo_tx_timeout = lec_tx_timeout,
676 .ndo_set_multicast_list = lec_set_multicast_list,
677 };
678
679
680 static void lec_init(struct net_device *dev)
681 {
682 dev->netdev_ops = &lec_netdev_ops;
683 printk("%s: Initialized!\n", dev->name);
684 }
685
686 static const unsigned char lec_ctrl_magic[] = {
687 0xff,
688 0x00,
689 0x01,
690 0x01
691 };
692
693 #define LEC_DATA_DIRECT_8023 2
694 #define LEC_DATA_DIRECT_8025 3
695
696 static int lec_is_data_direct(struct atm_vcc *vcc)
697 {
698 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
699 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
700 }
701
702 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
703 {
704 unsigned long flags;
705 struct net_device *dev = (struct net_device *)vcc->proto_data;
706 struct lec_priv *priv = netdev_priv(dev);
707
708 #if DUMP_PACKETS >0
709 int i = 0;
710 char buf[300];
711
712 printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
713 vcc->vpi, vcc->vci);
714 #endif
715 if (!skb) {
716 pr_debug("%s: null skb\n", dev->name);
717 lec_vcc_close(priv, vcc);
718 return;
719 }
720 #if DUMP_PACKETS > 0
721 printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
722 skb->len, priv->lecid);
723 #if DUMP_PACKETS >= 2
724 for (i = 0; i < skb->len && i < 99; i++) {
725 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
726 }
727 #elif DUMP_PACKETS >= 1
728 for (i = 0; i < skb->len && i < 30; i++) {
729 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
730 }
731 #endif /* DUMP_PACKETS >= 1 */
732 if (i == skb->len)
733 printk("%s\n", buf);
734 else
735 printk("%s...\n", buf);
736 #endif /* DUMP_PACKETS > 0 */
737 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) { /* Control frame, to daemon */
738 struct sock *sk = sk_atm(vcc);
739
740 pr_debug("%s: To daemon\n", dev->name);
741 skb_queue_tail(&sk->sk_receive_queue, skb);
742 sk->sk_data_ready(sk, skb->len);
743 } else { /* Data frame, queue to protocol handlers */
744 struct lec_arp_table *entry;
745 unsigned char *src, *dst;
746
747 atm_return(vcc, skb->truesize);
748 if (*(__be16 *) skb->data == htons(priv->lecid) ||
749 !priv->lecd || !(dev->flags & IFF_UP)) {
750 /*
751 * Probably looping back, or if lecd is missing,
752 * lecd has gone down
753 */
754 pr_debug("Ignoring frame...\n");
755 dev_kfree_skb(skb);
756 return;
757 }
758 #ifdef CONFIG_TR
759 if (priv->is_trdev)
760 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
761 else
762 #endif
763 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
764
765 /*
766 * If this is a Data Direct VCC, and the VCC does not match
767 * the LE_ARP cache entry, delete the LE_ARP cache entry.
768 */
769 spin_lock_irqsave(&priv->lec_arp_lock, flags);
770 if (lec_is_data_direct(vcc)) {
771 #ifdef CONFIG_TR
772 if (priv->is_trdev)
773 src =
774 ((struct lecdatahdr_8025 *)skb->data)->
775 h_source;
776 else
777 #endif
778 src =
779 ((struct lecdatahdr_8023 *)skb->data)->
780 h_source;
781 entry = lec_arp_find(priv, src);
782 if (entry && entry->vcc != vcc) {
783 lec_arp_remove(priv, entry);
784 lec_arp_put(entry);
785 }
786 }
787 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
788
789 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
790 !priv->is_proxy && /* Proxy wants all the packets */
791 memcmp(dst, dev->dev_addr, dev->addr_len)) {
792 dev_kfree_skb(skb);
793 return;
794 }
795 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
796 lec_arp_check_empties(priv, vcc, skb);
797 }
798 skb_pull(skb, 2); /* skip lec_id */
799 #ifdef CONFIG_TR
800 if (priv->is_trdev)
801 skb->protocol = tr_type_trans(skb, dev);
802 else
803 #endif
804 skb->protocol = eth_type_trans(skb, dev);
805 dev->stats.rx_packets++;
806 dev->stats.rx_bytes += skb->len;
807 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
808 netif_rx(skb);
809 }
810 }
811
812 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
813 {
814 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
815 struct net_device *dev = skb->dev;
816
817 if (vpriv == NULL) {
818 printk("lec_pop(): vpriv = NULL!?!?!?\n");
819 return;
820 }
821
822 vpriv->old_pop(vcc, skb);
823
824 if (vpriv->xoff && atm_may_send(vcc, 0)) {
825 vpriv->xoff = 0;
826 if (netif_running(dev) && netif_queue_stopped(dev))
827 netif_wake_queue(dev);
828 }
829 }
830
831 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
832 {
833 struct lec_vcc_priv *vpriv;
834 int bytes_left;
835 struct atmlec_ioc ioc_data;
836
837 /* Lecd must be up in this case */
838 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
839 if (bytes_left != 0) {
840 printk
841 ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
842 bytes_left);
843 }
844 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
845 !dev_lec[ioc_data.dev_num])
846 return -EINVAL;
847 if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
848 return -ENOMEM;
849 vpriv->xoff = 0;
850 vpriv->old_pop = vcc->pop;
851 vcc->user_back = vpriv;
852 vcc->pop = lec_pop;
853 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
854 &ioc_data, vcc, vcc->push);
855 vcc->proto_data = dev_lec[ioc_data.dev_num];
856 vcc->push = lec_push;
857 return 0;
858 }
859
860 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
861 {
862 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
863 return -EINVAL;
864 vcc->proto_data = dev_lec[arg];
865 return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
866 vcc);
867 }
868
869 /* Initialize device. */
870 static int lecd_attach(struct atm_vcc *vcc, int arg)
871 {
872 int i;
873 struct lec_priv *priv;
874
875 if (arg < 0)
876 i = 0;
877 else
878 i = arg;
879 #ifdef CONFIG_TR
880 if (arg >= MAX_LEC_ITF)
881 return -EINVAL;
882 #else /* Reserve the top NUM_TR_DEVS for TR */
883 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
884 return -EINVAL;
885 #endif
886 if (!dev_lec[i]) {
887 int is_trdev, size;
888
889 is_trdev = 0;
890 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
891 is_trdev = 1;
892
893 size = sizeof(struct lec_priv);
894 #ifdef CONFIG_TR
895 if (is_trdev)
896 dev_lec[i] = alloc_trdev(size);
897 else
898 #endif
899 dev_lec[i] = alloc_etherdev(size);
900 if (!dev_lec[i])
901 return -ENOMEM;
902 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
903 if (register_netdev(dev_lec[i])) {
904 free_netdev(dev_lec[i]);
905 return -EINVAL;
906 }
907
908 priv = netdev_priv(dev_lec[i]);
909 priv->is_trdev = is_trdev;
910 lec_init(dev_lec[i]);
911 } else {
912 priv = netdev_priv(dev_lec[i]);
913 if (priv->lecd)
914 return -EADDRINUSE;
915 }
916 lec_arp_init(priv);
917 priv->itfnum = i; /* LANE2 addition */
918 priv->lecd = vcc;
919 vcc->dev = &lecatm_dev;
920 vcc_insert_socket(sk_atm(vcc));
921
922 vcc->proto_data = dev_lec[i];
923 set_bit(ATM_VF_META, &vcc->flags);
924 set_bit(ATM_VF_READY, &vcc->flags);
925
926 /* Set default values to these variables */
927 priv->maximum_unknown_frame_count = 1;
928 priv->max_unknown_frame_time = (1 * HZ);
929 priv->vcc_timeout_period = (1200 * HZ);
930 priv->max_retry_count = 1;
931 priv->aging_time = (300 * HZ);
932 priv->forward_delay_time = (15 * HZ);
933 priv->topology_change = 0;
934 priv->arp_response_time = (1 * HZ);
935 priv->flush_timeout = (4 * HZ);
936 priv->path_switching_delay = (6 * HZ);
937
938 if (dev_lec[i]->flags & IFF_UP) {
939 netif_start_queue(dev_lec[i]);
940 }
941 __module_get(THIS_MODULE);
942 return i;
943 }
944
945 #ifdef CONFIG_PROC_FS
946 static char *lec_arp_get_status_string(unsigned char status)
947 {
948 static char *lec_arp_status_string[] = {
949 "ESI_UNKNOWN ",
950 "ESI_ARP_PENDING ",
951 "ESI_VC_PENDING ",
952 "<Undefined> ",
953 "ESI_FLUSH_PENDING ",
954 "ESI_FORWARD_DIRECT"
955 };
956
957 if (status > ESI_FORWARD_DIRECT)
958 status = 3; /* ESI_UNDEFINED */
959 return lec_arp_status_string[status];
960 }
961
962 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
963 {
964 int i;
965
966 for (i = 0; i < ETH_ALEN; i++)
967 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
968 seq_printf(seq, " ");
969 for (i = 0; i < ATM_ESA_LEN; i++)
970 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
971 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
972 entry->flags & 0xffff);
973 if (entry->vcc)
974 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
975 else
976 seq_printf(seq, " ");
977 if (entry->recv_vcc) {
978 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
979 entry->recv_vcc->vci);
980 }
981 seq_putc(seq, '\n');
982 }
983
984 struct lec_state {
985 unsigned long flags;
986 struct lec_priv *locked;
987 struct hlist_node *node;
988 struct net_device *dev;
989 int itf;
990 int arp_table;
991 int misc_table;
992 };
993
994 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
995 loff_t *l)
996 {
997 struct hlist_node *e = state->node;
998 struct lec_arp_table *tmp;
999
1000 if (!e)
1001 e = tbl->first;
1002 if (e == SEQ_START_TOKEN) {
1003 e = tbl->first;
1004 --*l;
1005 }
1006
1007 hlist_for_each_entry_from(tmp, e, next) {
1008 if (--*l < 0)
1009 break;
1010 }
1011 state->node = e;
1012
1013 return (*l < 0) ? state : NULL;
1014 }
1015
1016 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1017 struct lec_priv *priv)
1018 {
1019 void *v = NULL;
1020 int p;
1021
1022 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1023 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1024 if (v)
1025 break;
1026 }
1027 state->arp_table = p;
1028 return v;
1029 }
1030
1031 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1032 struct lec_priv *priv)
1033 {
1034 struct hlist_head *lec_misc_tables[] = {
1035 &priv->lec_arp_empty_ones,
1036 &priv->lec_no_forward,
1037 &priv->mcast_fwds
1038 };
1039 void *v = NULL;
1040 int q;
1041
1042 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1043 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1044 if (v)
1045 break;
1046 }
1047 state->misc_table = q;
1048 return v;
1049 }
1050
1051 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1052 struct lec_priv *priv)
1053 {
1054 if (!state->locked) {
1055 state->locked = priv;
1056 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1057 }
1058 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1059 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1060 state->locked = NULL;
1061 /* Partial state reset for the next time we get called */
1062 state->arp_table = state->misc_table = 0;
1063 }
1064 return state->locked;
1065 }
1066
1067 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1068 {
1069 struct net_device *dev;
1070 void *v;
1071
1072 dev = state->dev ? state->dev : dev_lec[state->itf];
1073 v = (dev && netdev_priv(dev)) ?
1074 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1075 if (!v && dev) {
1076 dev_put(dev);
1077 /* Partial state reset for the next time we get called */
1078 dev = NULL;
1079 }
1080 state->dev = dev;
1081 return v;
1082 }
1083
1084 static void *lec_get_idx(struct lec_state *state, loff_t l)
1085 {
1086 void *v = NULL;
1087
1088 for (; state->itf < MAX_LEC_ITF; state->itf++) {
1089 v = lec_itf_walk(state, &l);
1090 if (v)
1091 break;
1092 }
1093 return v;
1094 }
1095
1096 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1097 {
1098 struct lec_state *state = seq->private;
1099
1100 state->itf = 0;
1101 state->dev = NULL;
1102 state->locked = NULL;
1103 state->arp_table = 0;
1104 state->misc_table = 0;
1105 state->node = SEQ_START_TOKEN;
1106
1107 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1108 }
1109
1110 static void lec_seq_stop(struct seq_file *seq, void *v)
1111 {
1112 struct lec_state *state = seq->private;
1113
1114 if (state->dev) {
1115 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1116 state->flags);
1117 dev_put(state->dev);
1118 }
1119 }
1120
1121 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1122 {
1123 struct lec_state *state = seq->private;
1124
1125 v = lec_get_idx(state, 1);
1126 *pos += !!PTR_ERR(v);
1127 return v;
1128 }
1129
1130 static int lec_seq_show(struct seq_file *seq, void *v)
1131 {
1132 static char lec_banner[] = "Itf MAC ATM destination"
1133 " Status Flags "
1134 "VPI/VCI Recv VPI/VCI\n";
1135
1136 if (v == SEQ_START_TOKEN)
1137 seq_puts(seq, lec_banner);
1138 else {
1139 struct lec_state *state = seq->private;
1140 struct net_device *dev = state->dev;
1141 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1142
1143 seq_printf(seq, "%s ", dev->name);
1144 lec_info(seq, entry);
1145 }
1146 return 0;
1147 }
1148
1149 static const struct seq_operations lec_seq_ops = {
1150 .start = lec_seq_start,
1151 .next = lec_seq_next,
1152 .stop = lec_seq_stop,
1153 .show = lec_seq_show,
1154 };
1155
1156 static int lec_seq_open(struct inode *inode, struct file *file)
1157 {
1158 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1159 }
1160
1161 static const struct file_operations lec_seq_fops = {
1162 .owner = THIS_MODULE,
1163 .open = lec_seq_open,
1164 .read = seq_read,
1165 .llseek = seq_lseek,
1166 .release = seq_release_private,
1167 };
1168 #endif
1169
1170 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1171 {
1172 struct atm_vcc *vcc = ATM_SD(sock);
1173 int err = 0;
1174
1175 switch (cmd) {
1176 case ATMLEC_CTRL:
1177 case ATMLEC_MCAST:
1178 case ATMLEC_DATA:
1179 if (!capable(CAP_NET_ADMIN))
1180 return -EPERM;
1181 break;
1182 default:
1183 return -ENOIOCTLCMD;
1184 }
1185
1186 switch (cmd) {
1187 case ATMLEC_CTRL:
1188 err = lecd_attach(vcc, (int)arg);
1189 if (err >= 0)
1190 sock->state = SS_CONNECTED;
1191 break;
1192 case ATMLEC_MCAST:
1193 err = lec_mcast_attach(vcc, (int)arg);
1194 break;
1195 case ATMLEC_DATA:
1196 err = lec_vcc_attach(vcc, (void __user *)arg);
1197 break;
1198 }
1199
1200 return err;
1201 }
1202
1203 static struct atm_ioctl lane_ioctl_ops = {
1204 .owner = THIS_MODULE,
1205 .ioctl = lane_ioctl,
1206 };
1207
1208 static int __init lane_module_init(void)
1209 {
1210 #ifdef CONFIG_PROC_FS
1211 struct proc_dir_entry *p;
1212
1213 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1214 if (!p) {
1215 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1216 return -ENOMEM;
1217 }
1218 #endif
1219
1220 register_atm_ioctl(&lane_ioctl_ops);
1221 printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1222 return 0;
1223 }
1224
1225 static void __exit lane_module_cleanup(void)
1226 {
1227 int i;
1228 struct lec_priv *priv;
1229
1230 remove_proc_entry("lec", atm_proc_root);
1231
1232 deregister_atm_ioctl(&lane_ioctl_ops);
1233
1234 for (i = 0; i < MAX_LEC_ITF; i++) {
1235 if (dev_lec[i] != NULL) {
1236 priv = netdev_priv(dev_lec[i]);
1237 unregister_netdev(dev_lec[i]);
1238 free_netdev(dev_lec[i]);
1239 dev_lec[i] = NULL;
1240 }
1241 }
1242
1243 return;
1244 }
1245
1246 module_init(lane_module_init);
1247 module_exit(lane_module_cleanup);
1248
1249 /*
1250 * LANE2: 3.1.3, LE_RESOLVE.request
1251 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1252 * If sizeoftlvs == NULL the default TLVs associated with with this
1253 * lec will be used.
1254 * If dst_mac == NULL, targetless LE_ARP will be sent
1255 */
1256 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1257 u8 **tlvs, u32 *sizeoftlvs)
1258 {
1259 unsigned long flags;
1260 struct lec_priv *priv = netdev_priv(dev);
1261 struct lec_arp_table *table;
1262 struct sk_buff *skb;
1263 int retval;
1264
1265 if (force == 0) {
1266 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1267 table = lec_arp_find(priv, dst_mac);
1268 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1269 if (table == NULL)
1270 return -1;
1271
1272 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1273 if (*tlvs == NULL)
1274 return -1;
1275
1276 *sizeoftlvs = table->sizeoftlvs;
1277
1278 return 0;
1279 }
1280
1281 if (sizeoftlvs == NULL)
1282 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1283
1284 else {
1285 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1286 if (skb == NULL)
1287 return -1;
1288 skb->len = *sizeoftlvs;
1289 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1290 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1291 }
1292 return retval;
1293 }
1294
1295 /*
1296 * LANE2: 3.1.4, LE_ASSOCIATE.request
1297 * Associate the *tlvs with the *lan_dst address.
1298 * Will overwrite any previous association
1299 * Returns 1 for success, 0 for failure (out of memory)
1300 *
1301 */
1302 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1303 const u8 *tlvs, u32 sizeoftlvs)
1304 {
1305 int retval;
1306 struct sk_buff *skb;
1307 struct lec_priv *priv = netdev_priv(dev);
1308
1309 if (compare_ether_addr(lan_dst, dev->dev_addr))
1310 return (0); /* not our mac address */
1311
1312 kfree(priv->tlvs); /* NULL if there was no previous association */
1313
1314 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1315 if (priv->tlvs == NULL)
1316 return (0);
1317 priv->sizeoftlvs = sizeoftlvs;
1318
1319 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1320 if (skb == NULL)
1321 return 0;
1322 skb->len = sizeoftlvs;
1323 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1324 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1325 if (retval != 0)
1326 printk("lec.c: lane2_associate_req() failed\n");
1327 /*
1328 * If the previous association has changed we must
1329 * somehow notify other LANE entities about the change
1330 */
1331 return (1);
1332 }
1333
1334 /*
1335 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1336 *
1337 */
1338 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1339 const u8 *tlvs, u32 sizeoftlvs)
1340 {
1341 #if 0
1342 int i = 0;
1343 #endif
1344 struct lec_priv *priv = netdev_priv(dev);
1345 #if 0 /*
1346 * Why have the TLVs in LE_ARP entries
1347 * since we do not use them? When you
1348 * uncomment this code, make sure the
1349 * TLVs get freed when entry is killed
1350 */
1351 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1352
1353 if (entry == NULL)
1354 return; /* should not happen */
1355
1356 kfree(entry->tlvs);
1357
1358 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1359 if (entry->tlvs == NULL)
1360 return;
1361 entry->sizeoftlvs = sizeoftlvs;
1362 #endif
1363 #if 0
1364 printk("lec.c: lane2_associate_ind()\n");
1365 printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1366 while (i < sizeoftlvs)
1367 printk("%02x ", tlvs[i++]);
1368
1369 printk("\n");
1370 #endif
1371
1372 /* tell MPOA about the TLVs we saw */
1373 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1374 priv->lane2_ops->associate_indicator(dev, mac_addr,
1375 tlvs, sizeoftlvs);
1376 }
1377 return;
1378 }
1379
1380 /*
1381 * Here starts what used to lec_arpc.c
1382 *
1383 * lec_arpc.c was added here when making
1384 * lane client modular. October 1997
1385 */
1386
1387 #include <linux/types.h>
1388 #include <linux/timer.h>
1389 #include <asm/param.h>
1390 #include <asm/atomic.h>
1391 #include <linux/inetdevice.h>
1392 #include <net/route.h>
1393
1394 #if 0
1395 #define pr_debug(format,args...)
1396 /*
1397 #define pr_debug printk
1398 */
1399 #endif
1400 #define DEBUG_ARP_TABLE 0
1401
1402 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1403
1404 static void lec_arp_check_expire(struct work_struct *work);
1405 static void lec_arp_expire_arp(unsigned long data);
1406
1407 /*
1408 * Arp table funcs
1409 */
1410
1411 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1412
1413 /*
1414 * Initialization of arp-cache
1415 */
1416 static void lec_arp_init(struct lec_priv *priv)
1417 {
1418 unsigned short i;
1419
1420 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1421 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1422 }
1423 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1424 INIT_HLIST_HEAD(&priv->lec_no_forward);
1425 INIT_HLIST_HEAD(&priv->mcast_fwds);
1426 spin_lock_init(&priv->lec_arp_lock);
1427 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1428 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1429 }
1430
1431 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1432 {
1433 if (entry->vcc) {
1434 struct atm_vcc *vcc = entry->vcc;
1435 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1436 struct net_device *dev = (struct net_device *)vcc->proto_data;
1437
1438 vcc->pop = vpriv->old_pop;
1439 if (vpriv->xoff)
1440 netif_wake_queue(dev);
1441 kfree(vpriv);
1442 vcc->user_back = NULL;
1443 vcc->push = entry->old_push;
1444 vcc_release_async(vcc, -EPIPE);
1445 entry->vcc = NULL;
1446 }
1447 if (entry->recv_vcc) {
1448 entry->recv_vcc->push = entry->old_recv_push;
1449 vcc_release_async(entry->recv_vcc, -EPIPE);
1450 entry->recv_vcc = NULL;
1451 }
1452 }
1453
1454 /*
1455 * Insert entry to lec_arp_table
1456 * LANE2: Add to the end of the list to satisfy 8.1.13
1457 */
1458 static inline void
1459 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1460 {
1461 struct hlist_head *tmp;
1462
1463 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1464 hlist_add_head(&entry->next, tmp);
1465
1466 pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1467 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1468 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1469 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1470 }
1471
1472 /*
1473 * Remove entry from lec_arp_table
1474 */
1475 static int
1476 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1477 {
1478 struct hlist_node *node;
1479 struct lec_arp_table *entry;
1480 int i, remove_vcc = 1;
1481
1482 if (!to_remove) {
1483 return -1;
1484 }
1485
1486 hlist_del(&to_remove->next);
1487 del_timer(&to_remove->timer);
1488
1489 /* If this is the only MAC connected to this VCC, also tear down the VCC */
1490 if (to_remove->status >= ESI_FLUSH_PENDING) {
1491 /*
1492 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1493 */
1494 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1495 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1496 if (memcmp(to_remove->atm_addr,
1497 entry->atm_addr, ATM_ESA_LEN) == 0) {
1498 remove_vcc = 0;
1499 break;
1500 }
1501 }
1502 }
1503 if (remove_vcc)
1504 lec_arp_clear_vccs(to_remove);
1505 }
1506 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1507
1508 pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1509 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1510 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1511 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1512 return 0;
1513 }
1514
1515 #if DEBUG_ARP_TABLE
1516 static char *get_status_string(unsigned char st)
1517 {
1518 switch (st) {
1519 case ESI_UNKNOWN:
1520 return "ESI_UNKNOWN";
1521 case ESI_ARP_PENDING:
1522 return "ESI_ARP_PENDING";
1523 case ESI_VC_PENDING:
1524 return "ESI_VC_PENDING";
1525 case ESI_FLUSH_PENDING:
1526 return "ESI_FLUSH_PENDING";
1527 case ESI_FORWARD_DIRECT:
1528 return "ESI_FORWARD_DIRECT";
1529 default:
1530 return "<UNKNOWN>";
1531 }
1532 }
1533
1534 static void dump_arp_table(struct lec_priv *priv)
1535 {
1536 struct hlist_node *node;
1537 struct lec_arp_table *rulla;
1538 char buf[256];
1539 int i, j, offset;
1540
1541 printk("Dump %p:\n", priv);
1542 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1543 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1544 offset = 0;
1545 offset += sprintf(buf, "%d: %p\n", i, rulla);
1546 offset += sprintf(buf + offset, "Mac:");
1547 for (j = 0; j < ETH_ALEN; j++) {
1548 offset += sprintf(buf + offset,
1549 "%2.2x ",
1550 rulla->mac_addr[j] & 0xff);
1551 }
1552 offset += sprintf(buf + offset, "Atm:");
1553 for (j = 0; j < ATM_ESA_LEN; j++) {
1554 offset += sprintf(buf + offset,
1555 "%2.2x ",
1556 rulla->atm_addr[j] & 0xff);
1557 }
1558 offset += sprintf(buf + offset,
1559 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1560 rulla->vcc ? rulla->vcc->vpi : 0,
1561 rulla->vcc ? rulla->vcc->vci : 0,
1562 rulla->recv_vcc ? rulla->recv_vcc->
1563 vpi : 0,
1564 rulla->recv_vcc ? rulla->recv_vcc->
1565 vci : 0, rulla->last_used,
1566 rulla->timestamp, rulla->no_tries);
1567 offset +=
1568 sprintf(buf + offset,
1569 "Flags:%x, Packets_flooded:%x, Status: %s ",
1570 rulla->flags, rulla->packets_flooded,
1571 get_status_string(rulla->status));
1572 printk("%s\n", buf);
1573 }
1574 }
1575
1576 if (!hlist_empty(&priv->lec_no_forward))
1577 printk("No forward\n");
1578 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1579 offset = 0;
1580 offset += sprintf(buf + offset, "Mac:");
1581 for (j = 0; j < ETH_ALEN; j++) {
1582 offset += sprintf(buf + offset, "%2.2x ",
1583 rulla->mac_addr[j] & 0xff);
1584 }
1585 offset += sprintf(buf + offset, "Atm:");
1586 for (j = 0; j < ATM_ESA_LEN; j++) {
1587 offset += sprintf(buf + offset, "%2.2x ",
1588 rulla->atm_addr[j] & 0xff);
1589 }
1590 offset += sprintf(buf + offset,
1591 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1592 rulla->vcc ? rulla->vcc->vpi : 0,
1593 rulla->vcc ? rulla->vcc->vci : 0,
1594 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1595 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1596 rulla->last_used,
1597 rulla->timestamp, rulla->no_tries);
1598 offset += sprintf(buf + offset,
1599 "Flags:%x, Packets_flooded:%x, Status: %s ",
1600 rulla->flags, rulla->packets_flooded,
1601 get_status_string(rulla->status));
1602 printk("%s\n", buf);
1603 }
1604
1605 if (!hlist_empty(&priv->lec_arp_empty_ones))
1606 printk("Empty ones\n");
1607 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1608 offset = 0;
1609 offset += sprintf(buf + offset, "Mac:");
1610 for (j = 0; j < ETH_ALEN; j++) {
1611 offset += sprintf(buf + offset, "%2.2x ",
1612 rulla->mac_addr[j] & 0xff);
1613 }
1614 offset += sprintf(buf + offset, "Atm:");
1615 for (j = 0; j < ATM_ESA_LEN; j++) {
1616 offset += sprintf(buf + offset, "%2.2x ",
1617 rulla->atm_addr[j] & 0xff);
1618 }
1619 offset += sprintf(buf + offset,
1620 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1621 rulla->vcc ? rulla->vcc->vpi : 0,
1622 rulla->vcc ? rulla->vcc->vci : 0,
1623 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1624 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1625 rulla->last_used,
1626 rulla->timestamp, rulla->no_tries);
1627 offset += sprintf(buf + offset,
1628 "Flags:%x, Packets_flooded:%x, Status: %s ",
1629 rulla->flags, rulla->packets_flooded,
1630 get_status_string(rulla->status));
1631 printk("%s", buf);
1632 }
1633
1634 if (!hlist_empty(&priv->mcast_fwds))
1635 printk("Multicast Forward VCCs\n");
1636 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1637 offset = 0;
1638 offset += sprintf(buf + offset, "Mac:");
1639 for (j = 0; j < ETH_ALEN; j++) {
1640 offset += sprintf(buf + offset, "%2.2x ",
1641 rulla->mac_addr[j] & 0xff);
1642 }
1643 offset += sprintf(buf + offset, "Atm:");
1644 for (j = 0; j < ATM_ESA_LEN; j++) {
1645 offset += sprintf(buf + offset, "%2.2x ",
1646 rulla->atm_addr[j] & 0xff);
1647 }
1648 offset += sprintf(buf + offset,
1649 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1650 rulla->vcc ? rulla->vcc->vpi : 0,
1651 rulla->vcc ? rulla->vcc->vci : 0,
1652 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1653 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1654 rulla->last_used,
1655 rulla->timestamp, rulla->no_tries);
1656 offset += sprintf(buf + offset,
1657 "Flags:%x, Packets_flooded:%x, Status: %s ",
1658 rulla->flags, rulla->packets_flooded,
1659 get_status_string(rulla->status));
1660 printk("%s\n", buf);
1661 }
1662
1663 }
1664 #else
1665 #define dump_arp_table(priv) do { } while (0)
1666 #endif
1667
1668 /*
1669 * Destruction of arp-cache
1670 */
1671 static void lec_arp_destroy(struct lec_priv *priv)
1672 {
1673 unsigned long flags;
1674 struct hlist_node *node, *next;
1675 struct lec_arp_table *entry;
1676 int i;
1677
1678 cancel_rearming_delayed_work(&priv->lec_arp_work);
1679
1680 /*
1681 * Remove all entries
1682 */
1683
1684 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1685 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1686 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1687 lec_arp_remove(priv, entry);
1688 lec_arp_put(entry);
1689 }
1690 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1691 }
1692
1693 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, 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_arp_empty_ones);
1700
1701 hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1702 del_timer_sync(&entry->timer);
1703 lec_arp_clear_vccs(entry);
1704 hlist_del(&entry->next);
1705 lec_arp_put(entry);
1706 }
1707 INIT_HLIST_HEAD(&priv->lec_no_forward);
1708
1709 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1710 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1711 lec_arp_clear_vccs(entry);
1712 hlist_del(&entry->next);
1713 lec_arp_put(entry);
1714 }
1715 INIT_HLIST_HEAD(&priv->mcast_fwds);
1716 priv->mcast_vcc = NULL;
1717 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1718 }
1719
1720 /*
1721 * Find entry by mac_address
1722 */
1723 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1724 const unsigned char *mac_addr)
1725 {
1726 struct hlist_node *node;
1727 struct hlist_head *head;
1728 struct lec_arp_table *entry;
1729
1730 pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1731 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1732 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1733
1734 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1735 hlist_for_each_entry(entry, node, head, next) {
1736 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1737 return entry;
1738 }
1739 }
1740 return NULL;
1741 }
1742
1743 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1744 const unsigned char *mac_addr)
1745 {
1746 struct lec_arp_table *to_return;
1747
1748 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1749 if (!to_return) {
1750 printk("LEC: Arp entry kmalloc failed\n");
1751 return NULL;
1752 }
1753 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1754 INIT_HLIST_NODE(&to_return->next);
1755 setup_timer(&to_return->timer, lec_arp_expire_arp,
1756 (unsigned long)to_return);
1757 to_return->last_used = jiffies;
1758 to_return->priv = priv;
1759 skb_queue_head_init(&to_return->tx_wait);
1760 atomic_set(&to_return->usage, 1);
1761 return to_return;
1762 }
1763
1764 /* Arp sent timer expired */
1765 static void lec_arp_expire_arp(unsigned long data)
1766 {
1767 struct lec_arp_table *entry;
1768
1769 entry = (struct lec_arp_table *)data;
1770
1771 pr_debug("lec_arp_expire_arp\n");
1772 if (entry->status == ESI_ARP_PENDING) {
1773 if (entry->no_tries <= entry->priv->max_retry_count) {
1774 if (entry->is_rdesc)
1775 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1776 entry->mac_addr, NULL, NULL);
1777 else
1778 send_to_lecd(entry->priv, l_arp_xmt,
1779 entry->mac_addr, NULL, NULL);
1780 entry->no_tries++;
1781 }
1782 mod_timer(&entry->timer, jiffies + (1 * HZ));
1783 }
1784 }
1785
1786 /* Unknown/unused vcc expire, remove associated entry */
1787 static void lec_arp_expire_vcc(unsigned long data)
1788 {
1789 unsigned long flags;
1790 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1791 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1792
1793 del_timer(&to_remove->timer);
1794
1795 pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1796 to_remove, priv,
1797 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1798 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1799
1800 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1801 hlist_del(&to_remove->next);
1802 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1803
1804 lec_arp_clear_vccs(to_remove);
1805 lec_arp_put(to_remove);
1806 }
1807
1808 /*
1809 * Expire entries.
1810 * 1. Re-set timer
1811 * 2. For each entry, delete entries that have aged past the age limit.
1812 * 3. For each entry, depending on the status of the entry, perform
1813 * the following maintenance.
1814 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1815 * tick_count is above the max_unknown_frame_time, clear
1816 * the tick_count to zero and clear the packets_flooded counter
1817 * to zero. This supports the packet rate limit per address
1818 * while flooding unknowns.
1819 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1820 * than or equal to the path_switching_delay, change the status
1821 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1822 * regardless of the progress of the flush protocol.
1823 */
1824 static void lec_arp_check_expire(struct work_struct *work)
1825 {
1826 unsigned long flags;
1827 struct lec_priv *priv =
1828 container_of(work, struct lec_priv, lec_arp_work.work);
1829 struct hlist_node *node, *next;
1830 struct lec_arp_table *entry;
1831 unsigned long now;
1832 unsigned long time_to_check;
1833 int i;
1834
1835 pr_debug("lec_arp_check_expire %p\n", priv);
1836 now = jiffies;
1837 restart:
1838 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1839 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1840 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1841 if ((entry->flags) & LEC_REMOTE_FLAG &&
1842 priv->topology_change)
1843 time_to_check = priv->forward_delay_time;
1844 else
1845 time_to_check = priv->aging_time;
1846
1847 pr_debug("About to expire: %lx - %lx > %lx\n",
1848 now, entry->last_used, time_to_check);
1849 if (time_after(now, entry->last_used + time_to_check)
1850 && !(entry->flags & LEC_PERMANENT_FLAG)
1851 && !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1852 /* Remove entry */
1853 pr_debug("LEC:Entry timed out\n");
1854 lec_arp_remove(priv, entry);
1855 lec_arp_put(entry);
1856 } else {
1857 /* Something else */
1858 if ((entry->status == ESI_VC_PENDING ||
1859 entry->status == ESI_ARP_PENDING)
1860 && time_after_eq(now,
1861 entry->timestamp +
1862 priv->
1863 max_unknown_frame_time)) {
1864 entry->timestamp = jiffies;
1865 entry->packets_flooded = 0;
1866 if (entry->status == ESI_VC_PENDING)
1867 send_to_lecd(priv, l_svc_setup,
1868 entry->mac_addr,
1869 entry->atm_addr,
1870 NULL);
1871 }
1872 if (entry->status == ESI_FLUSH_PENDING
1873 &&
1874 time_after_eq(now, entry->timestamp +
1875 priv->path_switching_delay)) {
1876 struct sk_buff *skb;
1877 struct atm_vcc *vcc = entry->vcc;
1878
1879 lec_arp_hold(entry);
1880 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1881 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1882 lec_send(vcc, skb);
1883 entry->last_used = jiffies;
1884 entry->status = ESI_FORWARD_DIRECT;
1885 lec_arp_put(entry);
1886 goto restart;
1887 }
1888 }
1889 }
1890 }
1891 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1892
1893 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1894 }
1895
1896 /*
1897 * Try to find vcc where mac_address is attached.
1898 *
1899 */
1900 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1901 const unsigned char *mac_to_find, int is_rdesc,
1902 struct lec_arp_table **ret_entry)
1903 {
1904 unsigned long flags;
1905 struct lec_arp_table *entry;
1906 struct atm_vcc *found;
1907
1908 if (mac_to_find[0] & 0x01) {
1909 switch (priv->lane_version) {
1910 case 1:
1911 return priv->mcast_vcc;
1912 case 2: /* LANE2 wants arp for multicast addresses */
1913 if (!compare_ether_addr(mac_to_find, bus_mac))
1914 return priv->mcast_vcc;
1915 break;
1916 default:
1917 break;
1918 }
1919 }
1920
1921 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1922 entry = lec_arp_find(priv, mac_to_find);
1923
1924 if (entry) {
1925 if (entry->status == ESI_FORWARD_DIRECT) {
1926 /* Connection Ok */
1927 entry->last_used = jiffies;
1928 lec_arp_hold(entry);
1929 *ret_entry = entry;
1930 found = entry->vcc;
1931 goto out;
1932 }
1933 /*
1934 * If the LE_ARP cache entry is still pending, reset count to 0
1935 * so another LE_ARP request can be made for this frame.
1936 */
1937 if (entry->status == ESI_ARP_PENDING) {
1938 entry->no_tries = 0;
1939 }
1940 /*
1941 * Data direct VC not yet set up, check to see if the unknown
1942 * frame count is greater than the limit. If the limit has
1943 * not been reached, allow the caller to send packet to
1944 * BUS.
1945 */
1946 if (entry->status != ESI_FLUSH_PENDING &&
1947 entry->packets_flooded <
1948 priv->maximum_unknown_frame_count) {
1949 entry->packets_flooded++;
1950 pr_debug("LEC_ARP: Flooding..\n");
1951 found = priv->mcast_vcc;
1952 goto out;
1953 }
1954 /*
1955 * We got here because entry->status == ESI_FLUSH_PENDING
1956 * or BUS flood limit was reached for an entry which is
1957 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1958 */
1959 lec_arp_hold(entry);
1960 *ret_entry = entry;
1961 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1962 entry->vcc);
1963 found = NULL;
1964 } else {
1965 /* No matching entry was found */
1966 entry = make_entry(priv, mac_to_find);
1967 pr_debug("LEC_ARP: Making entry\n");
1968 if (!entry) {
1969 found = priv->mcast_vcc;
1970 goto out;
1971 }
1972 lec_arp_add(priv, entry);
1973 /* We want arp-request(s) to be sent */
1974 entry->packets_flooded = 1;
1975 entry->status = ESI_ARP_PENDING;
1976 entry->no_tries = 1;
1977 entry->last_used = entry->timestamp = jiffies;
1978 entry->is_rdesc = is_rdesc;
1979 if (entry->is_rdesc)
1980 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1981 NULL);
1982 else
1983 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1984 entry->timer.expires = jiffies + (1 * HZ);
1985 entry->timer.function = lec_arp_expire_arp;
1986 add_timer(&entry->timer);
1987 found = priv->mcast_vcc;
1988 }
1989
1990 out:
1991 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1992 return found;
1993 }
1994
1995 static int
1996 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1997 unsigned long permanent)
1998 {
1999 unsigned long flags;
2000 struct hlist_node *node, *next;
2001 struct lec_arp_table *entry;
2002 int i;
2003
2004 pr_debug("lec_addr_delete\n");
2005 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2006 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2007 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2008 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2009 && (permanent ||
2010 !(entry->flags & LEC_PERMANENT_FLAG))) {
2011 lec_arp_remove(priv, entry);
2012 lec_arp_put(entry);
2013 }
2014 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2015 return 0;
2016 }
2017 }
2018 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2019 return -1;
2020 }
2021
2022 /*
2023 * Notifies: Response to arp_request (atm_addr != NULL)
2024 */
2025 static void
2026 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2027 const unsigned char *atm_addr, unsigned long remoteflag,
2028 unsigned int targetless_le_arp)
2029 {
2030 unsigned long flags;
2031 struct hlist_node *node, *next;
2032 struct lec_arp_table *entry, *tmp;
2033 int i;
2034
2035 pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2036 pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2037 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2038 mac_addr[4], mac_addr[5]);
2039
2040 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2041 entry = lec_arp_find(priv, mac_addr);
2042 if (entry == NULL && targetless_le_arp)
2043 goto out; /*
2044 * LANE2: ignore targetless LE_ARPs for which
2045 * we have no entry in the cache. 7.1.30
2046 */
2047 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2048 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2049 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2050 hlist_del(&entry->next);
2051 del_timer(&entry->timer);
2052 tmp = lec_arp_find(priv, mac_addr);
2053 if (tmp) {
2054 del_timer(&tmp->timer);
2055 tmp->status = ESI_FORWARD_DIRECT;
2056 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2057 tmp->vcc = entry->vcc;
2058 tmp->old_push = entry->old_push;
2059 tmp->last_used = jiffies;
2060 del_timer(&entry->timer);
2061 lec_arp_put(entry);
2062 entry = tmp;
2063 } else {
2064 entry->status = ESI_FORWARD_DIRECT;
2065 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2066 entry->last_used = jiffies;
2067 lec_arp_add(priv, entry);
2068 }
2069 if (remoteflag)
2070 entry->flags |= LEC_REMOTE_FLAG;
2071 else
2072 entry->flags &= ~LEC_REMOTE_FLAG;
2073 pr_debug("After update\n");
2074 dump_arp_table(priv);
2075 goto out;
2076 }
2077 }
2078 }
2079
2080 entry = lec_arp_find(priv, mac_addr);
2081 if (!entry) {
2082 entry = make_entry(priv, mac_addr);
2083 if (!entry)
2084 goto out;
2085 entry->status = ESI_UNKNOWN;
2086 lec_arp_add(priv, entry);
2087 /* Temporary, changes before end of function */
2088 }
2089 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2090 del_timer(&entry->timer);
2091 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2092 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2093 if (entry != tmp &&
2094 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2095 /* Vcc to this host exists */
2096 if (tmp->status > ESI_VC_PENDING) {
2097 /*
2098 * ESI_FLUSH_PENDING,
2099 * ESI_FORWARD_DIRECT
2100 */
2101 entry->vcc = tmp->vcc;
2102 entry->old_push = tmp->old_push;
2103 }
2104 entry->status = tmp->status;
2105 break;
2106 }
2107 }
2108 }
2109 if (remoteflag)
2110 entry->flags |= LEC_REMOTE_FLAG;
2111 else
2112 entry->flags &= ~LEC_REMOTE_FLAG;
2113 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2114 entry->status = ESI_VC_PENDING;
2115 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2116 }
2117 pr_debug("After update2\n");
2118 dump_arp_table(priv);
2119 out:
2120 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2121 }
2122
2123 /*
2124 * Notifies: Vcc setup ready
2125 */
2126 static void
2127 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2128 struct atm_vcc *vcc,
2129 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2130 {
2131 unsigned long flags;
2132 struct hlist_node *node;
2133 struct lec_arp_table *entry;
2134 int i, found_entry = 0;
2135
2136 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2137 if (ioc_data->receive == 2) {
2138 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2139
2140 pr_debug("LEC_ARP: Attaching mcast forward\n");
2141 #if 0
2142 entry = lec_arp_find(priv, bus_mac);
2143 if (!entry) {
2144 printk("LEC_ARP: Multicast entry not found!\n");
2145 goto out;
2146 }
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 #endif
2151 entry = make_entry(priv, bus_mac);
2152 if (entry == NULL)
2153 goto out;
2154 del_timer(&entry->timer);
2155 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2156 entry->recv_vcc = vcc;
2157 entry->old_recv_push = old_push;
2158 hlist_add_head(&entry->next, &priv->mcast_fwds);
2159 goto out;
2160 } else if (ioc_data->receive == 1) {
2161 /*
2162 * Vcc which we don't want to make default vcc,
2163 * attach it anyway.
2164 */
2165 pr_debug
2166 ("LEC_ARP:Attaching data direct, not default: "
2167 "%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",
2168 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2169 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2170 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2171 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2172 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2173 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2174 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2175 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2176 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2177 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2178 entry = make_entry(priv, bus_mac);
2179 if (entry == NULL)
2180 goto out;
2181 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2182 memset(entry->mac_addr, 0, ETH_ALEN);
2183 entry->recv_vcc = vcc;
2184 entry->old_recv_push = old_push;
2185 entry->status = ESI_UNKNOWN;
2186 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2187 entry->timer.function = lec_arp_expire_vcc;
2188 hlist_add_head(&entry->next, &priv->lec_no_forward);
2189 add_timer(&entry->timer);
2190 dump_arp_table(priv);
2191 goto out;
2192 }
2193 pr_debug
2194 ("LEC_ARP:Attaching data direct, default: "
2195 "%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",
2196 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2197 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2198 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2199 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2200 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2201 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2202 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2203 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2204 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2205 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2206 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2207 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2208 if (memcmp
2209 (ioc_data->atm_addr, entry->atm_addr,
2210 ATM_ESA_LEN) == 0) {
2211 pr_debug("LEC_ARP: Attaching data direct\n");
2212 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2213 entry->vcc ? entry->vcc->vci : 0,
2214 entry->recv_vcc ? entry->recv_vcc->
2215 vci : 0);
2216 found_entry = 1;
2217 del_timer(&entry->timer);
2218 entry->vcc = vcc;
2219 entry->old_push = old_push;
2220 if (entry->status == ESI_VC_PENDING) {
2221 if (priv->maximum_unknown_frame_count
2222 == 0)
2223 entry->status =
2224 ESI_FORWARD_DIRECT;
2225 else {
2226 entry->timestamp = jiffies;
2227 entry->status =
2228 ESI_FLUSH_PENDING;
2229 #if 0
2230 send_to_lecd(priv, l_flush_xmt,
2231 NULL,
2232 entry->atm_addr,
2233 NULL);
2234 #endif
2235 }
2236 } else {
2237 /*
2238 * They were forming a connection
2239 * to us, and we to them. Our
2240 * ATM address is numerically lower
2241 * than theirs, so we make connection
2242 * we formed into default VCC (8.1.11).
2243 * Connection they made gets torn
2244 * down. This might confuse some
2245 * clients. Can be changed if
2246 * someone reports trouble...
2247 */
2248 ;
2249 }
2250 }
2251 }
2252 }
2253 if (found_entry) {
2254 pr_debug("After vcc was added\n");
2255 dump_arp_table(priv);
2256 goto out;
2257 }
2258 /*
2259 * Not found, snatch address from first data packet that arrives
2260 * from this vcc
2261 */
2262 entry = make_entry(priv, bus_mac);
2263 if (!entry)
2264 goto out;
2265 entry->vcc = vcc;
2266 entry->old_push = old_push;
2267 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2268 memset(entry->mac_addr, 0, ETH_ALEN);
2269 entry->status = ESI_UNKNOWN;
2270 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2271 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2272 entry->timer.function = lec_arp_expire_vcc;
2273 add_timer(&entry->timer);
2274 pr_debug("After vcc was added\n");
2275 dump_arp_table(priv);
2276 out:
2277 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2278 }
2279
2280 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2281 {
2282 unsigned long flags;
2283 struct hlist_node *node;
2284 struct lec_arp_table *entry;
2285 int i;
2286
2287 pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2288 restart:
2289 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2290 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2291 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2292 if (entry->flush_tran_id == tran_id
2293 && entry->status == ESI_FLUSH_PENDING) {
2294 struct sk_buff *skb;
2295 struct atm_vcc *vcc = entry->vcc;
2296
2297 lec_arp_hold(entry);
2298 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2299 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2300 lec_send(vcc, skb);
2301 entry->last_used = jiffies;
2302 entry->status = ESI_FORWARD_DIRECT;
2303 lec_arp_put(entry);
2304 pr_debug("LEC_ARP: Flushed\n");
2305 goto restart;
2306 }
2307 }
2308 }
2309 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2310 dump_arp_table(priv);
2311 }
2312
2313 static void
2314 lec_set_flush_tran_id(struct lec_priv *priv,
2315 const unsigned char *atm_addr, unsigned long tran_id)
2316 {
2317 unsigned long flags;
2318 struct hlist_node *node;
2319 struct lec_arp_table *entry;
2320 int i;
2321
2322 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2323 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2324 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2325 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2326 entry->flush_tran_id = tran_id;
2327 pr_debug("Set flush transaction id to %lx for %p\n",
2328 tran_id, entry);
2329 }
2330 }
2331 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2332 }
2333
2334 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2335 {
2336 unsigned long flags;
2337 unsigned char mac_addr[] = {
2338 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2339 };
2340 struct lec_arp_table *to_add;
2341 struct lec_vcc_priv *vpriv;
2342 int err = 0;
2343
2344 if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2345 return -ENOMEM;
2346 vpriv->xoff = 0;
2347 vpriv->old_pop = vcc->pop;
2348 vcc->user_back = vpriv;
2349 vcc->pop = lec_pop;
2350 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2351 to_add = make_entry(priv, mac_addr);
2352 if (!to_add) {
2353 vcc->pop = vpriv->old_pop;
2354 kfree(vpriv);
2355 err = -ENOMEM;
2356 goto out;
2357 }
2358 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2359 to_add->status = ESI_FORWARD_DIRECT;
2360 to_add->flags |= LEC_PERMANENT_FLAG;
2361 to_add->vcc = vcc;
2362 to_add->old_push = vcc->push;
2363 vcc->push = lec_push;
2364 priv->mcast_vcc = vcc;
2365 lec_arp_add(priv, to_add);
2366 out:
2367 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2368 return err;
2369 }
2370
2371 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2372 {
2373 unsigned long flags;
2374 struct hlist_node *node, *next;
2375 struct lec_arp_table *entry;
2376 int i;
2377
2378 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2379 dump_arp_table(priv);
2380
2381 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2382
2383 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2384 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2385 if (vcc == entry->vcc) {
2386 lec_arp_remove(priv, entry);
2387 lec_arp_put(entry);
2388 if (priv->mcast_vcc == vcc) {
2389 priv->mcast_vcc = NULL;
2390 }
2391 }
2392 }
2393 }
2394
2395 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2396 if (entry->vcc == vcc) {
2397 lec_arp_clear_vccs(entry);
2398 del_timer(&entry->timer);
2399 hlist_del(&entry->next);
2400 lec_arp_put(entry);
2401 }
2402 }
2403
2404 hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2405 if (entry->recv_vcc == vcc) {
2406 lec_arp_clear_vccs(entry);
2407 del_timer(&entry->timer);
2408 hlist_del(&entry->next);
2409 lec_arp_put(entry);
2410 }
2411 }
2412
2413 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2414 if (entry->recv_vcc == vcc) {
2415 lec_arp_clear_vccs(entry);
2416 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2417 hlist_del(&entry->next);
2418 lec_arp_put(entry);
2419 }
2420 }
2421
2422 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2423 dump_arp_table(priv);
2424 }
2425
2426 static void
2427 lec_arp_check_empties(struct lec_priv *priv,
2428 struct atm_vcc *vcc, struct sk_buff *skb)
2429 {
2430 unsigned long flags;
2431 struct hlist_node *node, *next;
2432 struct lec_arp_table *entry, *tmp;
2433 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2434 unsigned char *src;
2435 #ifdef CONFIG_TR
2436 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2437
2438 if (priv->is_trdev)
2439 src = tr_hdr->h_source;
2440 else
2441 #endif
2442 src = hdr->h_source;
2443
2444 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2445 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2446 if (vcc == entry->vcc) {
2447 del_timer(&entry->timer);
2448 memcpy(entry->mac_addr, src, ETH_ALEN);
2449 entry->status = ESI_FORWARD_DIRECT;
2450 entry->last_used = jiffies;
2451 /* We might have got an entry */
2452 if ((tmp = lec_arp_find(priv, src))) {
2453 lec_arp_remove(priv, tmp);
2454 lec_arp_put(tmp);
2455 }
2456 hlist_del(&entry->next);
2457 lec_arp_add(priv, entry);
2458 goto out;
2459 }
2460 }
2461 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2462 out:
2463 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2464 }
2465
2466 MODULE_LICENSE("GPL");
linux-next