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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[linux-2.6/linux-2.6-stable.git] / net / atm / lec.c
blob215c9fad7cdf48161628a0db9486590f40b74f50
1 /*
2 * lec.c: Lan Emulation driver
3 *
4 * Marko Kiiskila <mkiiskila@yahoo.com>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
8
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/bitops.h>
12 #include <linux/capability.h>
13
14 /* We are ethernet device */
15 #include <linux/if_ether.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <net/sock.h>
19 #include <linux/skbuff.h>
20 #include <linux/ip.h>
21 #include <asm/byteorder.h>
22 #include <linux/uaccess.h>
23 #include <net/arp.h>
24 #include <net/dst.h>
25 #include <linux/proc_fs.h>
26 #include <linux/spinlock.h>
27 #include <linux/seq_file.h>
28
29 /* TokenRing if needed */
30 #ifdef CONFIG_TR
31 #include <linux/trdevice.h>
32 #endif
33
34 /* And atm device */
35 #include <linux/atmdev.h>
36 #include <linux/atmlec.h>
37
38 /* Proxy LEC knows about bridging */
39 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
40 #include "../bridge/br_private.h"
41
42 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
43 #endif
44
45 /* Modular too */
46 #include <linux/module.h>
47 #include <linux/init.h>
48
49 #include "lec.h"
50 #include "lec_arpc.h"
51 #include "resources.h"
52
53 #define DUMP_PACKETS 0 /*
54 * 0 = None,
55 * 1 = 30 first bytes
56 * 2 = Whole packet
57 */
58
59 #define LEC_UNRES_QUE_LEN 8 /*
60 * number of tx packets to queue for a
61 * single destination while waiting for SVC
62 */
63
64 static int lec_open(struct net_device *dev);
65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
66 struct net_device *dev);
67 static int lec_close(struct net_device *dev);
68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
69 const unsigned char *mac_addr);
70 static int lec_arp_remove(struct lec_priv *priv,
71 struct lec_arp_table *to_remove);
72 /* LANE2 functions */
73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
74 const u8 *tlvs, u32 sizeoftlvs);
75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
76 u8 **tlvs, u32 *sizeoftlvs);
77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
78 const u8 *tlvs, u32 sizeoftlvs);
79
80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
81 unsigned long permanent);
82 static void lec_arp_check_empties(struct lec_priv *priv,
83 struct atm_vcc *vcc, struct sk_buff *skb);
84 static void lec_arp_destroy(struct lec_priv *priv);
85 static void lec_arp_init(struct lec_priv *priv);
86 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
87 const unsigned char *mac_to_find,
88 int is_rdesc,
89 struct lec_arp_table **ret_entry);
90 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
91 const unsigned char *atm_addr,
92 unsigned long remoteflag,
93 unsigned int targetless_le_arp);
94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
96 static void lec_set_flush_tran_id(struct lec_priv *priv,
97 const unsigned char *atm_addr,
98 unsigned long tran_id);
99 static void lec_vcc_added(struct lec_priv *priv,
100 const struct atmlec_ioc *ioc_data,
101 struct atm_vcc *vcc,
102 void (*old_push)(struct atm_vcc *vcc,
103 struct sk_buff *skb));
104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
105
106 /* must be done under lec_arp_lock */
107 static inline void lec_arp_hold(struct lec_arp_table *entry)
108 {
109 atomic_inc(&entry->usage);
110 }
111
112 static inline void lec_arp_put(struct lec_arp_table *entry)
113 {
114 if (atomic_dec_and_test(&entry->usage))
115 kfree(entry);
116 }
117
118 static struct lane2_ops lane2_ops = {
119 lane2_resolve, /* resolve, spec 3.1.3 */
120 lane2_associate_req, /* associate_req, spec 3.1.4 */
121 NULL /* associate indicator, spec 3.1.5 */
122 };
123
124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125
126 /* Device structures */
127 static struct net_device *dev_lec[MAX_LEC_ITF];
128
129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132 char *buff;
133 struct lec_priv *priv;
134
135 /*
136 * Check if this is a BPDU. If so, ask zeppelin to send
137 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
138 * as the Config BPDU has
139 */
140 buff = skb->data + skb->dev->hard_header_len;
141 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
142 struct sock *sk;
143 struct sk_buff *skb2;
144 struct atmlec_msg *mesg;
145
146 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
147 if (skb2 == NULL)
148 return;
149 skb2->len = sizeof(struct atmlec_msg);
150 mesg = (struct atmlec_msg *)skb2->data;
151 mesg->type = l_topology_change;
152 buff += 4;
153 mesg->content.normal.flag = *buff & 0x01;
154 /* 0x01 is topology change */
155
156 priv = netdev_priv(dev);
157 atm_force_charge(priv->lecd, skb2->truesize);
158 sk = sk_atm(priv->lecd);
159 skb_queue_tail(&sk->sk_receive_queue, skb2);
160 sk->sk_data_ready(sk, skb2->len);
161 }
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
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 pr_info("%s\n", dev->name);
246 dev->trans_start = jiffies;
247 netif_wake_queue(dev);
248 }
249
250 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
251 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
265 pr_debug("called\n");
266 if (!priv->lecd) {
267 pr_info("%s:No lecd attached\n", dev->name);
268 dev->stats.tx_errors++;
269 netif_stop_queue(dev);
270 kfree_skb(skb);
271 return NETDEV_TX_OK;
272 }
273
274 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
275 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
276 (long)skb_end_pointer(skb));
277 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
278 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
279 lec_handle_bridge(skb, dev);
280 #endif
281
282 /* Make sure we have room for lec_id */
283 if (skb_headroom(skb) < 2) {
284 pr_debug("reallocating skb\n");
285 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
286 kfree_skb(skb);
287 if (skb2 == NULL)
288 return NETDEV_TX_OK;
289 skb = skb2;
290 }
291 skb_push(skb, 2);
292
293 /* Put le header to place, works for TokenRing too */
294 lec_h = (struct lecdatahdr_8023 *)skb->data;
295 lec_h->le_header = htons(priv->lecid);
296
297 #ifdef CONFIG_TR
298 /*
299 * Ugly. Use this to realign Token Ring packets for
300 * e.g. PCA-200E driver.
301 */
302 if (priv->is_trdev) {
303 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
304 kfree_skb(skb);
305 if (skb2 == NULL)
306 return NETDEV_TX_OK;
307 skb = skb2;
308 }
309 #endif
310
311 #if DUMP_PACKETS >= 2
312 #define MAX_DUMP_SKB 99
313 #elif DUMP_PACKETS >= 1
314 #define MAX_DUMP_SKB 30
315 #endif
316 #if DUMP_PACKETS >= 1
317 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
318 dev->name, skb->len, priv->lecid);
319 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
320 skb->data, min(skb->len, MAX_DUMP_SKB), true);
321 #endif /* DUMP_PACKETS >= 1 */
322
323 /* Minimum ethernet-frame size */
324 #ifdef CONFIG_TR
325 if (priv->is_trdev)
326 min_frame_size = LEC_MINIMUM_8025_SIZE;
327 else
328 #endif
329 min_frame_size = LEC_MINIMUM_8023_SIZE;
330 if (skb->len < min_frame_size) {
331 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
332 skb2 = skb_copy_expand(skb, 0,
333 min_frame_size - skb->truesize,
334 GFP_ATOMIC);
335 dev_kfree_skb(skb);
336 if (skb2 == NULL) {
337 dev->stats.tx_dropped++;
338 return NETDEV_TX_OK;
339 }
340 skb = skb2;
341 }
342 skb_put(skb, min_frame_size - skb->len);
343 }
344
345 /* Send to right vcc */
346 is_rdesc = 0;
347 dst = lec_h->h_dest;
348 #ifdef CONFIG_TR
349 if (priv->is_trdev) {
350 dst = get_tr_dst(skb->data + 2, rdesc);
351 if (dst == NULL) {
352 dst = rdesc;
353 is_rdesc = 1;
354 }
355 }
356 #endif
357 entry = NULL;
358 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
359 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
360 dev->name, vcc, vcc ? vcc->flags : 0, entry);
361 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
362 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
363 pr_debug("%s:queuing packet, MAC address %pM\n",
364 dev->name, lec_h->h_dest);
365 skb_queue_tail(&entry->tx_wait, skb);
366 } else {
367 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
368 dev->name, lec_h->h_dest);
369 dev->stats.tx_dropped++;
370 dev_kfree_skb(skb);
371 }
372 goto out;
373 }
374 #if DUMP_PACKETS > 0
375 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
376 dev->name, vcc->vpi, vcc->vci);
377 #endif /* DUMP_PACKETS > 0 */
378
379 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
380 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
381 lec_send(vcc, skb2);
382 }
383
384 lec_send(vcc, skb);
385
386 if (!atm_may_send(vcc, 0)) {
387 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
388
389 vpriv->xoff = 1;
390 netif_stop_queue(dev);
391
392 /*
393 * vcc->pop() might have occurred in between, making
394 * the vcc usuable again. Since xmit is serialized,
395 * this is the only situation we have to re-test.
396 */
397
398 if (atm_may_send(vcc, 0))
399 netif_wake_queue(dev);
400 }
401
402 out:
403 if (entry)
404 lec_arp_put(entry);
405 dev->trans_start = jiffies;
406 return NETDEV_TX_OK;
407 }
408
409 /* The inverse routine to net_open(). */
410 static int lec_close(struct net_device *dev)
411 {
412 netif_stop_queue(dev);
413 return 0;
414 }
415
416 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
417 {
418 unsigned long flags;
419 struct net_device *dev = (struct net_device *)vcc->proto_data;
420 struct lec_priv *priv = netdev_priv(dev);
421 struct atmlec_msg *mesg;
422 struct lec_arp_table *entry;
423 int i;
424 char *tmp; /* FIXME */
425
426 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
427 mesg = (struct atmlec_msg *)skb->data;
428 tmp = skb->data;
429 tmp += sizeof(struct atmlec_msg);
430 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
431 switch (mesg->type) {
432 case l_set_mac_addr:
433 for (i = 0; i < 6; i++)
434 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
435 break;
436 case l_del_mac_addr:
437 for (i = 0; i < 6; i++)
438 dev->dev_addr[i] = 0;
439 break;
440 case l_addr_delete:
441 lec_addr_delete(priv, mesg->content.normal.atm_addr,
442 mesg->content.normal.flag);
443 break;
444 case l_topology_change:
445 priv->topology_change = mesg->content.normal.flag;
446 break;
447 case l_flush_complete:
448 lec_flush_complete(priv, mesg->content.normal.flag);
449 break;
450 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
451 spin_lock_irqsave(&priv->lec_arp_lock, flags);
452 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
453 lec_arp_remove(priv, entry);
454 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
455
456 if (mesg->content.normal.no_source_le_narp)
457 break;
458 /* FALL THROUGH */
459 case l_arp_update:
460 lec_arp_update(priv, mesg->content.normal.mac_addr,
461 mesg->content.normal.atm_addr,
462 mesg->content.normal.flag,
463 mesg->content.normal.targetless_le_arp);
464 pr_debug("in l_arp_update\n");
465 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
466 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
467 mesg->sizeoftlvs);
468 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
469 tmp, mesg->sizeoftlvs);
470 }
471 break;
472 case l_config:
473 priv->maximum_unknown_frame_count =
474 mesg->content.config.maximum_unknown_frame_count;
475 priv->max_unknown_frame_time =
476 (mesg->content.config.max_unknown_frame_time * HZ);
477 priv->max_retry_count = mesg->content.config.max_retry_count;
478 priv->aging_time = (mesg->content.config.aging_time * HZ);
479 priv->forward_delay_time =
480 (mesg->content.config.forward_delay_time * HZ);
481 priv->arp_response_time =
482 (mesg->content.config.arp_response_time * HZ);
483 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
484 priv->path_switching_delay =
485 (mesg->content.config.path_switching_delay * HZ);
486 priv->lane_version = mesg->content.config.lane_version;
487 /* LANE2 */
488 priv->lane2_ops = NULL;
489 if (priv->lane_version > 1)
490 priv->lane2_ops = &lane2_ops;
491 if (dev_set_mtu(dev, mesg->content.config.mtu))
492 pr_info("%s: change_mtu to %d failed\n",
493 dev->name, mesg->content.config.mtu);
494 priv->is_proxy = mesg->content.config.is_proxy;
495 break;
496 case l_flush_tran_id:
497 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
498 mesg->content.normal.flag);
499 break;
500 case l_set_lecid:
501 priv->lecid =
502 (unsigned short)(0xffff & mesg->content.normal.flag);
503 break;
504 case l_should_bridge:
505 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
506 {
507 pr_debug("%s: bridge zeppelin asks about %pM\n",
508 dev->name, mesg->content.proxy.mac_addr);
509
510 if (br_fdb_test_addr_hook == NULL)
511 break;
512
513 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
514 /* hit from bridge table, send LE_ARP_RESPONSE */
515 struct sk_buff *skb2;
516 struct sock *sk;
517
518 pr_debug("%s: entry found, responding to zeppelin\n",
519 dev->name);
520 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
521 if (skb2 == NULL)
522 break;
523 skb2->len = sizeof(struct atmlec_msg);
524 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
525 atm_force_charge(priv->lecd, skb2->truesize);
526 sk = sk_atm(priv->lecd);
527 skb_queue_tail(&sk->sk_receive_queue, skb2);
528 sk->sk_data_ready(sk, skb2->len);
529 }
530 }
531 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
532 break;
533 default:
534 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
535 dev_kfree_skb(skb);
536 return -EINVAL;
537 }
538 dev_kfree_skb(skb);
539 return 0;
540 }
541
542 static void lec_atm_close(struct atm_vcc *vcc)
543 {
544 struct sk_buff *skb;
545 struct net_device *dev = (struct net_device *)vcc->proto_data;
546 struct lec_priv *priv = netdev_priv(dev);
547
548 priv->lecd = NULL;
549 /* Do something needful? */
550
551 netif_stop_queue(dev);
552 lec_arp_destroy(priv);
553
554 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
555 pr_info("%s closing with messages pending\n", dev->name);
556 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
557 atm_return(vcc, skb->truesize);
558 dev_kfree_skb(skb);
559 }
560
561 pr_info("%s: Shut down!\n", dev->name);
562 module_put(THIS_MODULE);
563 }
564
565 static struct atmdev_ops lecdev_ops = {
566 .close = lec_atm_close,
567 .send = lec_atm_send
568 };
569
570 static struct atm_dev lecatm_dev = {
571 .ops = &lecdev_ops,
572 .type = "lec",
573 .number = 999, /* dummy device number */
574 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
575 };
576
577 /*
578 * LANE2: new argument struct sk_buff *data contains
579 * the LE_ARP based TLVs introduced in the LANE2 spec
580 */
581 static int
582 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
583 const unsigned char *mac_addr, const unsigned char *atm_addr,
584 struct sk_buff *data)
585 {
586 struct sock *sk;
587 struct sk_buff *skb;
588 struct atmlec_msg *mesg;
589
590 if (!priv || !priv->lecd)
591 return -1;
592 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
593 if (!skb)
594 return -1;
595 skb->len = sizeof(struct atmlec_msg);
596 mesg = (struct atmlec_msg *)skb->data;
597 memset(mesg, 0, sizeof(struct atmlec_msg));
598 mesg->type = type;
599 if (data != NULL)
600 mesg->sizeoftlvs = data->len;
601 if (mac_addr)
602 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
603 else
604 mesg->content.normal.targetless_le_arp = 1;
605 if (atm_addr)
606 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
607
608 atm_force_charge(priv->lecd, skb->truesize);
609 sk = sk_atm(priv->lecd);
610 skb_queue_tail(&sk->sk_receive_queue, skb);
611 sk->sk_data_ready(sk, skb->len);
612
613 if (data != NULL) {
614 pr_debug("about to send %d bytes of data\n", data->len);
615 atm_force_charge(priv->lecd, data->truesize);
616 skb_queue_tail(&sk->sk_receive_queue, data);
617 sk->sk_data_ready(sk, skb->len);
618 }
619
620 return 0;
621 }
622
623 /* shamelessly stolen from drivers/net/net_init.c */
624 static int lec_change_mtu(struct net_device *dev, int new_mtu)
625 {
626 if ((new_mtu < 68) || (new_mtu > 18190))
627 return -EINVAL;
628 dev->mtu = new_mtu;
629 return 0;
630 }
631
632 static void lec_set_multicast_list(struct net_device *dev)
633 {
634 /*
635 * by default, all multicast frames arrive over the bus.
636 * eventually support selective multicast service
637 */
638 }
639
640 static const struct net_device_ops lec_netdev_ops = {
641 .ndo_open = lec_open,
642 .ndo_stop = lec_close,
643 .ndo_start_xmit = lec_start_xmit,
644 .ndo_change_mtu = lec_change_mtu,
645 .ndo_tx_timeout = lec_tx_timeout,
646 .ndo_set_multicast_list = lec_set_multicast_list,
647 };
648
649 static const unsigned char lec_ctrl_magic[] = {
650 0xff,
651 0x00,
652 0x01,
653 0x01
654 };
655
656 #define LEC_DATA_DIRECT_8023 2
657 #define LEC_DATA_DIRECT_8025 3
658
659 static int lec_is_data_direct(struct atm_vcc *vcc)
660 {
661 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
662 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
663 }
664
665 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
666 {
667 unsigned long flags;
668 struct net_device *dev = (struct net_device *)vcc->proto_data;
669 struct lec_priv *priv = netdev_priv(dev);
670
671 #if DUMP_PACKETS > 0
672 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
673 dev->name, vcc->vpi, vcc->vci);
674 #endif
675 if (!skb) {
676 pr_debug("%s: null skb\n", dev->name);
677 lec_vcc_close(priv, vcc);
678 return;
679 }
680 #if DUMP_PACKETS >= 2
681 #define MAX_SKB_DUMP 99
682 #elif DUMP_PACKETS >= 1
683 #define MAX_SKB_DUMP 30
684 #endif
685 #if DUMP_PACKETS > 0
686 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
687 dev->name, skb->len, priv->lecid);
688 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
689 skb->data, min(MAX_SKB_DUMP, skb->len), true);
690 #endif /* DUMP_PACKETS > 0 */
691 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
692 /* Control frame, to daemon */
693 struct sock *sk = sk_atm(vcc);
694
695 pr_debug("%s: To daemon\n", dev->name);
696 skb_queue_tail(&sk->sk_receive_queue, skb);
697 sk->sk_data_ready(sk, skb->len);
698 } else { /* Data frame, queue to protocol handlers */
699 struct lec_arp_table *entry;
700 unsigned char *src, *dst;
701
702 atm_return(vcc, skb->truesize);
703 if (*(__be16 *) skb->data == htons(priv->lecid) ||
704 !priv->lecd || !(dev->flags & IFF_UP)) {
705 /*
706 * Probably looping back, or if lecd is missing,
707 * lecd has gone down
708 */
709 pr_debug("Ignoring frame...\n");
710 dev_kfree_skb(skb);
711 return;
712 }
713 #ifdef CONFIG_TR
714 if (priv->is_trdev)
715 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
716 else
717 #endif
718 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
719
720 /*
721 * If this is a Data Direct VCC, and the VCC does not match
722 * the LE_ARP cache entry, delete the LE_ARP cache entry.
723 */
724 spin_lock_irqsave(&priv->lec_arp_lock, flags);
725 if (lec_is_data_direct(vcc)) {
726 #ifdef CONFIG_TR
727 if (priv->is_trdev)
728 src =
729 ((struct lecdatahdr_8025 *)skb->data)->
730 h_source;
731 else
732 #endif
733 src =
734 ((struct lecdatahdr_8023 *)skb->data)->
735 h_source;
736 entry = lec_arp_find(priv, src);
737 if (entry && entry->vcc != vcc) {
738 lec_arp_remove(priv, entry);
739 lec_arp_put(entry);
740 }
741 }
742 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
743
744 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
745 !priv->is_proxy && /* Proxy wants all the packets */
746 memcmp(dst, dev->dev_addr, dev->addr_len)) {
747 dev_kfree_skb(skb);
748 return;
749 }
750 if (!hlist_empty(&priv->lec_arp_empty_ones))
751 lec_arp_check_empties(priv, vcc, skb);
752 skb_pull(skb, 2); /* skip lec_id */
753 #ifdef CONFIG_TR
754 if (priv->is_trdev)
755 skb->protocol = tr_type_trans(skb, dev);
756 else
757 #endif
758 skb->protocol = eth_type_trans(skb, dev);
759 dev->stats.rx_packets++;
760 dev->stats.rx_bytes += skb->len;
761 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
762 netif_rx(skb);
763 }
764 }
765
766 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
767 {
768 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
769 struct net_device *dev = skb->dev;
770
771 if (vpriv == NULL) {
772 pr_info("vpriv = NULL!?!?!?\n");
773 return;
774 }
775
776 vpriv->old_pop(vcc, skb);
777
778 if (vpriv->xoff && atm_may_send(vcc, 0)) {
779 vpriv->xoff = 0;
780 if (netif_running(dev) && netif_queue_stopped(dev))
781 netif_wake_queue(dev);
782 }
783 }
784
785 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
786 {
787 struct lec_vcc_priv *vpriv;
788 int bytes_left;
789 struct atmlec_ioc ioc_data;
790
791 /* Lecd must be up in this case */
792 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
793 if (bytes_left != 0)
794 pr_info("copy from user failed for %d bytes\n", bytes_left);
795 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
796 !dev_lec[ioc_data.dev_num])
797 return -EINVAL;
798 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
799 if (!vpriv)
800 return -ENOMEM;
801 vpriv->xoff = 0;
802 vpriv->old_pop = vcc->pop;
803 vcc->user_back = vpriv;
804 vcc->pop = lec_pop;
805 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
806 &ioc_data, vcc, vcc->push);
807 vcc->proto_data = dev_lec[ioc_data.dev_num];
808 vcc->push = lec_push;
809 return 0;
810 }
811
812 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
813 {
814 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
815 return -EINVAL;
816 vcc->proto_data = dev_lec[arg];
817 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
818 }
819
820 /* Initialize device. */
821 static int lecd_attach(struct atm_vcc *vcc, int arg)
822 {
823 int i;
824 struct lec_priv *priv;
825
826 if (arg < 0)
827 i = 0;
828 else
829 i = arg;
830 #ifdef CONFIG_TR
831 if (arg >= MAX_LEC_ITF)
832 return -EINVAL;
833 #else /* Reserve the top NUM_TR_DEVS for TR */
834 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
835 return -EINVAL;
836 #endif
837 if (!dev_lec[i]) {
838 int is_trdev, size;
839
840 is_trdev = 0;
841 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
842 is_trdev = 1;
843
844 size = sizeof(struct lec_priv);
845 #ifdef CONFIG_TR
846 if (is_trdev)
847 dev_lec[i] = alloc_trdev(size);
848 else
849 #endif
850 dev_lec[i] = alloc_etherdev(size);
851 if (!dev_lec[i])
852 return -ENOMEM;
853 dev_lec[i]->netdev_ops = &lec_netdev_ops;
854 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
855 if (register_netdev(dev_lec[i])) {
856 free_netdev(dev_lec[i]);
857 return -EINVAL;
858 }
859
860 priv = netdev_priv(dev_lec[i]);
861 priv->is_trdev = is_trdev;
862 } else {
863 priv = netdev_priv(dev_lec[i]);
864 if (priv->lecd)
865 return -EADDRINUSE;
866 }
867 lec_arp_init(priv);
868 priv->itfnum = i; /* LANE2 addition */
869 priv->lecd = vcc;
870 vcc->dev = &lecatm_dev;
871 vcc_insert_socket(sk_atm(vcc));
872
873 vcc->proto_data = dev_lec[i];
874 set_bit(ATM_VF_META, &vcc->flags);
875 set_bit(ATM_VF_READY, &vcc->flags);
876
877 /* Set default values to these variables */
878 priv->maximum_unknown_frame_count = 1;
879 priv->max_unknown_frame_time = (1 * HZ);
880 priv->vcc_timeout_period = (1200 * HZ);
881 priv->max_retry_count = 1;
882 priv->aging_time = (300 * HZ);
883 priv->forward_delay_time = (15 * HZ);
884 priv->topology_change = 0;
885 priv->arp_response_time = (1 * HZ);
886 priv->flush_timeout = (4 * HZ);
887 priv->path_switching_delay = (6 * HZ);
888
889 if (dev_lec[i]->flags & IFF_UP)
890 netif_start_queue(dev_lec[i]);
891 __module_get(THIS_MODULE);
892 return i;
893 }
894
895 #ifdef CONFIG_PROC_FS
896 static const char *lec_arp_get_status_string(unsigned char status)
897 {
898 static const char *const lec_arp_status_string[] = {
899 "ESI_UNKNOWN ",
900 "ESI_ARP_PENDING ",
901 "ESI_VC_PENDING ",
902 "<Undefined> ",
903 "ESI_FLUSH_PENDING ",
904 "ESI_FORWARD_DIRECT"
905 };
906
907 if (status > ESI_FORWARD_DIRECT)
908 status = 3; /* ESI_UNDEFINED */
909 return lec_arp_status_string[status];
910 }
911
912 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
913 {
914 int i;
915
916 for (i = 0; i < ETH_ALEN; i++)
917 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
918 seq_printf(seq, " ");
919 for (i = 0; i < ATM_ESA_LEN; i++)
920 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
921 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
922 entry->flags & 0xffff);
923 if (entry->vcc)
924 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
925 else
926 seq_printf(seq, " ");
927 if (entry->recv_vcc) {
928 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
929 entry->recv_vcc->vci);
930 }
931 seq_putc(seq, '\n');
932 }
933
934 struct lec_state {
935 unsigned long flags;
936 struct lec_priv *locked;
937 struct hlist_node *node;
938 struct net_device *dev;
939 int itf;
940 int arp_table;
941 int misc_table;
942 };
943
944 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
945 loff_t *l)
946 {
947 struct hlist_node *e = state->node;
948 struct lec_arp_table *tmp;
949
950 if (!e)
951 e = tbl->first;
952 if (e == SEQ_START_TOKEN) {
953 e = tbl->first;
954 --*l;
955 }
956
957 hlist_for_each_entry_from(tmp, e, next) {
958 if (--*l < 0)
959 break;
960 }
961 state->node = e;
962
963 return (*l < 0) ? state : NULL;
964 }
965
966 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
967 struct lec_priv *priv)
968 {
969 void *v = NULL;
970 int p;
971
972 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
973 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
974 if (v)
975 break;
976 }
977 state->arp_table = p;
978 return v;
979 }
980
981 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
982 struct lec_priv *priv)
983 {
984 struct hlist_head *lec_misc_tables[] = {
985 &priv->lec_arp_empty_ones,
986 &priv->lec_no_forward,
987 &priv->mcast_fwds
988 };
989 void *v = NULL;
990 int q;
991
992 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
993 v = lec_tbl_walk(state, lec_misc_tables[q], l);
994 if (v)
995 break;
996 }
997 state->misc_table = q;
998 return v;
999 }
1000
1001 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1002 struct lec_priv *priv)
1003 {
1004 if (!state->locked) {
1005 state->locked = priv;
1006 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1007 }
1008 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1009 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1010 state->locked = NULL;
1011 /* Partial state reset for the next time we get called */
1012 state->arp_table = state->misc_table = 0;
1013 }
1014 return state->locked;
1015 }
1016
1017 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1018 {
1019 struct net_device *dev;
1020 void *v;
1021
1022 dev = state->dev ? state->dev : dev_lec[state->itf];
1023 v = (dev && netdev_priv(dev)) ?
1024 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1025 if (!v && dev) {
1026 dev_put(dev);
1027 /* Partial state reset for the next time we get called */
1028 dev = NULL;
1029 }
1030 state->dev = dev;
1031 return v;
1032 }
1033
1034 static void *lec_get_idx(struct lec_state *state, loff_t l)
1035 {
1036 void *v = NULL;
1037
1038 for (; state->itf < MAX_LEC_ITF; state->itf++) {
1039 v = lec_itf_walk(state, &l);
1040 if (v)
1041 break;
1042 }
1043 return v;
1044 }
1045
1046 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1047 {
1048 struct lec_state *state = seq->private;
1049
1050 state->itf = 0;
1051 state->dev = NULL;
1052 state->locked = NULL;
1053 state->arp_table = 0;
1054 state->misc_table = 0;
1055 state->node = SEQ_START_TOKEN;
1056
1057 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1058 }
1059
1060 static void lec_seq_stop(struct seq_file *seq, void *v)
1061 {
1062 struct lec_state *state = seq->private;
1063
1064 if (state->dev) {
1065 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1066 state->flags);
1067 dev_put(state->dev);
1068 }
1069 }
1070
1071 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1072 {
1073 struct lec_state *state = seq->private;
1074
1075 v = lec_get_idx(state, 1);
1076 *pos += !!PTR_ERR(v);
1077 return v;
1078 }
1079
1080 static int lec_seq_show(struct seq_file *seq, void *v)
1081 {
1082 static const char lec_banner[] =
1083 "Itf MAC ATM destination"
1084 " Status Flags "
1085 "VPI/VCI Recv VPI/VCI\n";
1086
1087 if (v == SEQ_START_TOKEN)
1088 seq_puts(seq, lec_banner);
1089 else {
1090 struct lec_state *state = seq->private;
1091 struct net_device *dev = state->dev;
1092 struct lec_arp_table *entry = hlist_entry(state->node,
1093 struct lec_arp_table,
1094 next);
1095
1096 seq_printf(seq, "%s ", dev->name);
1097 lec_info(seq, entry);
1098 }
1099 return 0;
1100 }
1101
1102 static const struct seq_operations lec_seq_ops = {
1103 .start = lec_seq_start,
1104 .next = lec_seq_next,
1105 .stop = lec_seq_stop,
1106 .show = lec_seq_show,
1107 };
1108
1109 static int lec_seq_open(struct inode *inode, struct file *file)
1110 {
1111 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1112 }
1113
1114 static const struct file_operations lec_seq_fops = {
1115 .owner = THIS_MODULE,
1116 .open = lec_seq_open,
1117 .read = seq_read,
1118 .llseek = seq_lseek,
1119 .release = seq_release_private,
1120 };
1121 #endif
1122
1123 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1124 {
1125 struct atm_vcc *vcc = ATM_SD(sock);
1126 int err = 0;
1127
1128 switch (cmd) {
1129 case ATMLEC_CTRL:
1130 case ATMLEC_MCAST:
1131 case ATMLEC_DATA:
1132 if (!capable(CAP_NET_ADMIN))
1133 return -EPERM;
1134 break;
1135 default:
1136 return -ENOIOCTLCMD;
1137 }
1138
1139 switch (cmd) {
1140 case ATMLEC_CTRL:
1141 err = lecd_attach(vcc, (int)arg);
1142 if (err >= 0)
1143 sock->state = SS_CONNECTED;
1144 break;
1145 case ATMLEC_MCAST:
1146 err = lec_mcast_attach(vcc, (int)arg);
1147 break;
1148 case ATMLEC_DATA:
1149 err = lec_vcc_attach(vcc, (void __user *)arg);
1150 break;
1151 }
1152
1153 return err;
1154 }
1155
1156 static struct atm_ioctl lane_ioctl_ops = {
1157 .owner = THIS_MODULE,
1158 .ioctl = lane_ioctl,
1159 };
1160
1161 static int __init lane_module_init(void)
1162 {
1163 #ifdef CONFIG_PROC_FS
1164 struct proc_dir_entry *p;
1165
1166 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1167 if (!p) {
1168 pr_err("Unable to initialize /proc/net/atm/lec\n");
1169 return -ENOMEM;
1170 }
1171 #endif
1172
1173 register_atm_ioctl(&lane_ioctl_ops);
1174 pr_info("lec.c: initialized\n");
1175 return 0;
1176 }
1177
1178 static void __exit lane_module_cleanup(void)
1179 {
1180 int i;
1181
1182 remove_proc_entry("lec", atm_proc_root);
1183
1184 deregister_atm_ioctl(&lane_ioctl_ops);
1185
1186 for (i = 0; i < MAX_LEC_ITF; i++) {
1187 if (dev_lec[i] != NULL) {
1188 unregister_netdev(dev_lec[i]);
1189 free_netdev(dev_lec[i]);
1190 dev_lec[i] = NULL;
1191 }
1192 }
1193 }
1194
1195 module_init(lane_module_init);
1196 module_exit(lane_module_cleanup);
1197
1198 /*
1199 * LANE2: 3.1.3, LE_RESOLVE.request
1200 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1201 * If sizeoftlvs == NULL the default TLVs associated with with this
1202 * lec will be used.
1203 * If dst_mac == NULL, targetless LE_ARP will be sent
1204 */
1205 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1206 u8 **tlvs, u32 *sizeoftlvs)
1207 {
1208 unsigned long flags;
1209 struct lec_priv *priv = netdev_priv(dev);
1210 struct lec_arp_table *table;
1211 struct sk_buff *skb;
1212 int retval;
1213
1214 if (force == 0) {
1215 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1216 table = lec_arp_find(priv, dst_mac);
1217 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1218 if (table == NULL)
1219 return -1;
1220
1221 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1222 if (*tlvs == NULL)
1223 return -1;
1224
1225 *sizeoftlvs = table->sizeoftlvs;
1226
1227 return 0;
1228 }
1229
1230 if (sizeoftlvs == NULL)
1231 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1232
1233 else {
1234 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1235 if (skb == NULL)
1236 return -1;
1237 skb->len = *sizeoftlvs;
1238 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1239 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1240 }
1241 return retval;
1242 }
1243
1244 /*
1245 * LANE2: 3.1.4, LE_ASSOCIATE.request
1246 * Associate the *tlvs with the *lan_dst address.
1247 * Will overwrite any previous association
1248 * Returns 1 for success, 0 for failure (out of memory)
1249 *
1250 */
1251 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1252 const u8 *tlvs, u32 sizeoftlvs)
1253 {
1254 int retval;
1255 struct sk_buff *skb;
1256 struct lec_priv *priv = netdev_priv(dev);
1257
1258 if (compare_ether_addr(lan_dst, dev->dev_addr))
1259 return 0; /* not our mac address */
1260
1261 kfree(priv->tlvs); /* NULL if there was no previous association */
1262
1263 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1264 if (priv->tlvs == NULL)
1265 return 0;
1266 priv->sizeoftlvs = sizeoftlvs;
1267
1268 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1269 if (skb == NULL)
1270 return 0;
1271 skb->len = sizeoftlvs;
1272 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1273 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1274 if (retval != 0)
1275 pr_info("lec.c: lane2_associate_req() failed\n");
1276 /*
1277 * If the previous association has changed we must
1278 * somehow notify other LANE entities about the change
1279 */
1280 return 1;
1281 }
1282
1283 /*
1284 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1285 *
1286 */
1287 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1288 const u8 *tlvs, u32 sizeoftlvs)
1289 {
1290 #if 0
1291 int i = 0;
1292 #endif
1293 struct lec_priv *priv = netdev_priv(dev);
1294 #if 0 /*
1295 * Why have the TLVs in LE_ARP entries
1296 * since we do not use them? When you
1297 * uncomment this code, make sure the
1298 * TLVs get freed when entry is killed
1299 */
1300 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1301
1302 if (entry == NULL)
1303 return; /* should not happen */
1304
1305 kfree(entry->tlvs);
1306
1307 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1308 if (entry->tlvs == NULL)
1309 return;
1310 entry->sizeoftlvs = sizeoftlvs;
1311 #endif
1312 #if 0
1313 pr_info("\n");
1314 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1315 while (i < sizeoftlvs)
1316 pr_cont("%02x ", tlvs[i++]);
1317
1318 pr_cont("\n");
1319 #endif
1320
1321 /* tell MPOA about the TLVs we saw */
1322 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1323 priv->lane2_ops->associate_indicator(dev, mac_addr,
1324 tlvs, sizeoftlvs);
1325 }
1326 }
1327
1328 /*
1329 * Here starts what used to lec_arpc.c
1330 *
1331 * lec_arpc.c was added here when making
1332 * lane client modular. October 1997
1333 */
1334
1335 #include <linux/types.h>
1336 #include <linux/timer.h>
1337 #include <linux/param.h>
1338 #include <linux/atomic.h>
1339 #include <linux/inetdevice.h>
1340 #include <net/route.h>
1341
1342 #if 0
1343 #define pr_debug(format, args...)
1344 /*
1345 #define pr_debug printk
1346 */
1347 #endif
1348 #define DEBUG_ARP_TABLE 0
1349
1350 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1351
1352 static void lec_arp_check_expire(struct work_struct *work);
1353 static void lec_arp_expire_arp(unsigned long data);
1354
1355 /*
1356 * Arp table funcs
1357 */
1358
1359 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1360
1361 /*
1362 * Initialization of arp-cache
1363 */
1364 static void lec_arp_init(struct lec_priv *priv)
1365 {
1366 unsigned short i;
1367
1368 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1369 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1370 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1371 INIT_HLIST_HEAD(&priv->lec_no_forward);
1372 INIT_HLIST_HEAD(&priv->mcast_fwds);
1373 spin_lock_init(&priv->lec_arp_lock);
1374 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1375 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1376 }
1377
1378 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1379 {
1380 if (entry->vcc) {
1381 struct atm_vcc *vcc = entry->vcc;
1382 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1383 struct net_device *dev = (struct net_device *)vcc->proto_data;
1384
1385 vcc->pop = vpriv->old_pop;
1386 if (vpriv->xoff)
1387 netif_wake_queue(dev);
1388 kfree(vpriv);
1389 vcc->user_back = NULL;
1390 vcc->push = entry->old_push;
1391 vcc_release_async(vcc, -EPIPE);
1392 entry->vcc = NULL;
1393 }
1394 if (entry->recv_vcc) {
1395 entry->recv_vcc->push = entry->old_recv_push;
1396 vcc_release_async(entry->recv_vcc, -EPIPE);
1397 entry->recv_vcc = NULL;
1398 }
1399 }
1400
1401 /*
1402 * Insert entry to lec_arp_table
1403 * LANE2: Add to the end of the list to satisfy 8.1.13
1404 */
1405 static inline void
1406 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1407 {
1408 struct hlist_head *tmp;
1409
1410 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1411 hlist_add_head(&entry->next, tmp);
1412
1413 pr_debug("Added entry:%pM\n", entry->mac_addr);
1414 }
1415
1416 /*
1417 * Remove entry from lec_arp_table
1418 */
1419 static int
1420 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1421 {
1422 struct hlist_node *node;
1423 struct lec_arp_table *entry;
1424 int i, remove_vcc = 1;
1425
1426 if (!to_remove)
1427 return -1;
1428
1429 hlist_del(&to_remove->next);
1430 del_timer(&to_remove->timer);
1431
1432 /*
1433 * If this is the only MAC connected to this VCC,
1434 * also tear down the VCC
1435 */
1436 if (to_remove->status >= ESI_FLUSH_PENDING) {
1437 /*
1438 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1439 */
1440 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1441 hlist_for_each_entry(entry, node,
1442 &priv->lec_arp_tables[i], next) {
1443 if (memcmp(to_remove->atm_addr,
1444 entry->atm_addr, ATM_ESA_LEN) == 0) {
1445 remove_vcc = 0;
1446 break;
1447 }
1448 }
1449 }
1450 if (remove_vcc)
1451 lec_arp_clear_vccs(to_remove);
1452 }
1453 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1454
1455 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1456 return 0;
1457 }
1458
1459 #if DEBUG_ARP_TABLE
1460 static const char *get_status_string(unsigned char st)
1461 {
1462 switch (st) {
1463 case ESI_UNKNOWN:
1464 return "ESI_UNKNOWN";
1465 case ESI_ARP_PENDING:
1466 return "ESI_ARP_PENDING";
1467 case ESI_VC_PENDING:
1468 return "ESI_VC_PENDING";
1469 case ESI_FLUSH_PENDING:
1470 return "ESI_FLUSH_PENDING";
1471 case ESI_FORWARD_DIRECT:
1472 return "ESI_FORWARD_DIRECT";
1473 }
1474 return "<UNKNOWN>";
1475 }
1476
1477 static void dump_arp_table(struct lec_priv *priv)
1478 {
1479 struct hlist_node *node;
1480 struct lec_arp_table *rulla;
1481 char buf[256];
1482 int i, j, offset;
1483
1484 pr_info("Dump %p:\n", priv);
1485 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1486 hlist_for_each_entry(rulla, node,
1487 &priv->lec_arp_tables[i], next) {
1488 offset = 0;
1489 offset += sprintf(buf, "%d: %p\n", i, rulla);
1490 offset += sprintf(buf + offset, "Mac: %pM",
1491 rulla->mac_addr);
1492 offset += sprintf(buf + offset, " Atm:");
1493 for (j = 0; j < ATM_ESA_LEN; j++) {
1494 offset += sprintf(buf + offset,
1495 "%2.2x ",
1496 rulla->atm_addr[j] & 0xff);
1497 }
1498 offset += sprintf(buf + offset,
1499 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1500 rulla->vcc ? rulla->vcc->vpi : 0,
1501 rulla->vcc ? rulla->vcc->vci : 0,
1502 rulla->recv_vcc ? rulla->recv_vcc->
1503 vpi : 0,
1504 rulla->recv_vcc ? rulla->recv_vcc->
1505 vci : 0, rulla->last_used,
1506 rulla->timestamp, rulla->no_tries);
1507 offset +=
1508 sprintf(buf + offset,
1509 "Flags:%x, Packets_flooded:%x, Status: %s ",
1510 rulla->flags, rulla->packets_flooded,
1511 get_status_string(rulla->status));
1512 pr_info("%s\n", buf);
1513 }
1514 }
1515
1516 if (!hlist_empty(&priv->lec_no_forward))
1517 pr_info("No forward\n");
1518 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1519 offset = 0;
1520 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1521 offset += sprintf(buf + offset, " Atm:");
1522 for (j = 0; j < ATM_ESA_LEN; j++) {
1523 offset += sprintf(buf + offset, "%2.2x ",
1524 rulla->atm_addr[j] & 0xff);
1525 }
1526 offset += sprintf(buf + offset,
1527 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1528 rulla->vcc ? rulla->vcc->vpi : 0,
1529 rulla->vcc ? rulla->vcc->vci : 0,
1530 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1531 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1532 rulla->last_used,
1533 rulla->timestamp, rulla->no_tries);
1534 offset += sprintf(buf + offset,
1535 "Flags:%x, Packets_flooded:%x, Status: %s ",
1536 rulla->flags, rulla->packets_flooded,
1537 get_status_string(rulla->status));
1538 pr_info("%s\n", buf);
1539 }
1540
1541 if (!hlist_empty(&priv->lec_arp_empty_ones))
1542 pr_info("Empty ones\n");
1543 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1544 offset = 0;
1545 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1546 offset += sprintf(buf + offset, " Atm:");
1547 for (j = 0; j < ATM_ESA_LEN; j++) {
1548 offset += sprintf(buf + offset, "%2.2x ",
1549 rulla->atm_addr[j] & 0xff);
1550 }
1551 offset += sprintf(buf + offset,
1552 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1553 rulla->vcc ? rulla->vcc->vpi : 0,
1554 rulla->vcc ? rulla->vcc->vci : 0,
1555 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1556 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1557 rulla->last_used,
1558 rulla->timestamp, rulla->no_tries);
1559 offset += sprintf(buf + offset,
1560 "Flags:%x, Packets_flooded:%x, Status: %s ",
1561 rulla->flags, rulla->packets_flooded,
1562 get_status_string(rulla->status));
1563 pr_info("%s", buf);
1564 }
1565
1566 if (!hlist_empty(&priv->mcast_fwds))
1567 pr_info("Multicast Forward VCCs\n");
1568 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1569 offset = 0;
1570 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1571 offset += sprintf(buf + offset, " Atm:");
1572 for (j = 0; j < ATM_ESA_LEN; j++) {
1573 offset += sprintf(buf + offset, "%2.2x ",
1574 rulla->atm_addr[j] & 0xff);
1575 }
1576 offset += sprintf(buf + offset,
1577 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1578 rulla->vcc ? rulla->vcc->vpi : 0,
1579 rulla->vcc ? rulla->vcc->vci : 0,
1580 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1581 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1582 rulla->last_used,
1583 rulla->timestamp, rulla->no_tries);
1584 offset += sprintf(buf + offset,
1585 "Flags:%x, Packets_flooded:%x, Status: %s ",
1586 rulla->flags, rulla->packets_flooded,
1587 get_status_string(rulla->status));
1588 pr_info("%s\n", buf);
1589 }
1590
1591 }
1592 #else
1593 #define dump_arp_table(priv) do { } while (0)
1594 #endif
1595
1596 /*
1597 * Destruction of arp-cache
1598 */
1599 static void lec_arp_destroy(struct lec_priv *priv)
1600 {
1601 unsigned long flags;
1602 struct hlist_node *node, *next;
1603 struct lec_arp_table *entry;
1604 int i;
1605
1606 cancel_delayed_work_sync(&priv->lec_arp_work);
1607
1608 /*
1609 * Remove all entries
1610 */
1611
1612 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1613 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1614 hlist_for_each_entry_safe(entry, node, next,
1615 &priv->lec_arp_tables[i], next) {
1616 lec_arp_remove(priv, entry);
1617 lec_arp_put(entry);
1618 }
1619 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1620 }
1621
1622 hlist_for_each_entry_safe(entry, node, next,
1623 &priv->lec_arp_empty_ones, next) {
1624 del_timer_sync(&entry->timer);
1625 lec_arp_clear_vccs(entry);
1626 hlist_del(&entry->next);
1627 lec_arp_put(entry);
1628 }
1629 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1630
1631 hlist_for_each_entry_safe(entry, node, next,
1632 &priv->lec_no_forward, next) {
1633 del_timer_sync(&entry->timer);
1634 lec_arp_clear_vccs(entry);
1635 hlist_del(&entry->next);
1636 lec_arp_put(entry);
1637 }
1638 INIT_HLIST_HEAD(&priv->lec_no_forward);
1639
1640 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1641 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1642 lec_arp_clear_vccs(entry);
1643 hlist_del(&entry->next);
1644 lec_arp_put(entry);
1645 }
1646 INIT_HLIST_HEAD(&priv->mcast_fwds);
1647 priv->mcast_vcc = NULL;
1648 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1649 }
1650
1651 /*
1652 * Find entry by mac_address
1653 */
1654 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1655 const unsigned char *mac_addr)
1656 {
1657 struct hlist_node *node;
1658 struct hlist_head *head;
1659 struct lec_arp_table *entry;
1660
1661 pr_debug("%pM\n", mac_addr);
1662
1663 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1664 hlist_for_each_entry(entry, node, head, next) {
1665 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1666 return entry;
1667 }
1668 return NULL;
1669 }
1670
1671 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1672 const unsigned char *mac_addr)
1673 {
1674 struct lec_arp_table *to_return;
1675
1676 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1677 if (!to_return) {
1678 pr_info("LEC: Arp entry kmalloc failed\n");
1679 return NULL;
1680 }
1681 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1682 INIT_HLIST_NODE(&to_return->next);
1683 setup_timer(&to_return->timer, lec_arp_expire_arp,
1684 (unsigned long)to_return);
1685 to_return->last_used = jiffies;
1686 to_return->priv = priv;
1687 skb_queue_head_init(&to_return->tx_wait);
1688 atomic_set(&to_return->usage, 1);
1689 return to_return;
1690 }
1691
1692 /* Arp sent timer expired */
1693 static void lec_arp_expire_arp(unsigned long data)
1694 {
1695 struct lec_arp_table *entry;
1696
1697 entry = (struct lec_arp_table *)data;
1698
1699 pr_debug("\n");
1700 if (entry->status == ESI_ARP_PENDING) {
1701 if (entry->no_tries <= entry->priv->max_retry_count) {
1702 if (entry->is_rdesc)
1703 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1704 entry->mac_addr, NULL, NULL);
1705 else
1706 send_to_lecd(entry->priv, l_arp_xmt,
1707 entry->mac_addr, NULL, NULL);
1708 entry->no_tries++;
1709 }
1710 mod_timer(&entry->timer, jiffies + (1 * HZ));
1711 }
1712 }
1713
1714 /* Unknown/unused vcc expire, remove associated entry */
1715 static void lec_arp_expire_vcc(unsigned long data)
1716 {
1717 unsigned long flags;
1718 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1719 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1720
1721 del_timer(&to_remove->timer);
1722
1723 pr_debug("%p %p: vpi:%d vci:%d\n",
1724 to_remove, priv,
1725 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1726 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1727
1728 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1729 hlist_del(&to_remove->next);
1730 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1731
1732 lec_arp_clear_vccs(to_remove);
1733 lec_arp_put(to_remove);
1734 }
1735
1736 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1737 unsigned long now,
1738 struct lec_priv *priv)
1739 {
1740 unsigned long time_to_check;
1741
1742 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1743 time_to_check = priv->forward_delay_time;
1744 else
1745 time_to_check = priv->aging_time;
1746
1747 pr_debug("About to expire: %lx - %lx > %lx\n",
1748 now, entry->last_used, time_to_check);
1749 if (time_after(now, entry->last_used + time_to_check) &&
1750 !(entry->flags & LEC_PERMANENT_FLAG) &&
1751 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1752 /* Remove entry */
1753 pr_debug("Entry timed out\n");
1754 lec_arp_remove(priv, entry);
1755 lec_arp_put(entry);
1756 } else {
1757 /* Something else */
1758 if ((entry->status == ESI_VC_PENDING ||
1759 entry->status == ESI_ARP_PENDING) &&
1760 time_after_eq(now, entry->timestamp +
1761 priv->max_unknown_frame_time)) {
1762 entry->timestamp = jiffies;
1763 entry->packets_flooded = 0;
1764 if (entry->status == ESI_VC_PENDING)
1765 send_to_lecd(priv, l_svc_setup,
1766 entry->mac_addr,
1767 entry->atm_addr,
1768 NULL);
1769 }
1770 if (entry->status == ESI_FLUSH_PENDING &&
1771 time_after_eq(now, entry->timestamp +
1772 priv->path_switching_delay)) {
1773 lec_arp_hold(entry);
1774 return true;
1775 }
1776 }
1777
1778 return false;
1779 }
1780 /*
1781 * Expire entries.
1782 * 1. Re-set timer
1783 * 2. For each entry, delete entries that have aged past the age limit.
1784 * 3. For each entry, depending on the status of the entry, perform
1785 * the following maintenance.
1786 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1787 * tick_count is above the max_unknown_frame_time, clear
1788 * the tick_count to zero and clear the packets_flooded counter
1789 * to zero. This supports the packet rate limit per address
1790 * while flooding unknowns.
1791 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1792 * than or equal to the path_switching_delay, change the status
1793 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1794 * regardless of the progress of the flush protocol.
1795 */
1796 static void lec_arp_check_expire(struct work_struct *work)
1797 {
1798 unsigned long flags;
1799 struct lec_priv *priv =
1800 container_of(work, struct lec_priv, lec_arp_work.work);
1801 struct hlist_node *node, *next;
1802 struct lec_arp_table *entry;
1803 unsigned long now;
1804 int i;
1805
1806 pr_debug("%p\n", priv);
1807 now = jiffies;
1808 restart:
1809 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1810 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1811 hlist_for_each_entry_safe(entry, node, next,
1812 &priv->lec_arp_tables[i], next) {
1813 if (__lec_arp_check_expire(entry, now, priv)) {
1814 struct sk_buff *skb;
1815 struct atm_vcc *vcc = entry->vcc;
1816
1817 spin_unlock_irqrestore(&priv->lec_arp_lock,
1818 flags);
1819 while ((skb = skb_dequeue(&entry->tx_wait)))
1820 lec_send(vcc, skb);
1821 entry->last_used = jiffies;
1822 entry->status = ESI_FORWARD_DIRECT;
1823 lec_arp_put(entry);
1824
1825 goto restart;
1826 }
1827 }
1828 }
1829 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1830
1831 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1832 }
1833
1834 /*
1835 * Try to find vcc where mac_address is attached.
1836 *
1837 */
1838 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1839 const unsigned char *mac_to_find,
1840 int is_rdesc,
1841 struct lec_arp_table **ret_entry)
1842 {
1843 unsigned long flags;
1844 struct lec_arp_table *entry;
1845 struct atm_vcc *found;
1846
1847 if (mac_to_find[0] & 0x01) {
1848 switch (priv->lane_version) {
1849 case 1:
1850 return priv->mcast_vcc;
1851 case 2: /* LANE2 wants arp for multicast addresses */
1852 if (!compare_ether_addr(mac_to_find, bus_mac))
1853 return priv->mcast_vcc;
1854 break;
1855 default:
1856 break;
1857 }
1858 }
1859
1860 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1861 entry = lec_arp_find(priv, mac_to_find);
1862
1863 if (entry) {
1864 if (entry->status == ESI_FORWARD_DIRECT) {
1865 /* Connection Ok */
1866 entry->last_used = jiffies;
1867 lec_arp_hold(entry);
1868 *ret_entry = entry;
1869 found = entry->vcc;
1870 goto out;
1871 }
1872 /*
1873 * If the LE_ARP cache entry is still pending, reset count to 0
1874 * so another LE_ARP request can be made for this frame.
1875 */
1876 if (entry->status == ESI_ARP_PENDING)
1877 entry->no_tries = 0;
1878 /*
1879 * Data direct VC not yet set up, check to see if the unknown
1880 * frame count is greater than the limit. If the limit has
1881 * not been reached, allow the caller to send packet to
1882 * BUS.
1883 */
1884 if (entry->status != ESI_FLUSH_PENDING &&
1885 entry->packets_flooded <
1886 priv->maximum_unknown_frame_count) {
1887 entry->packets_flooded++;
1888 pr_debug("Flooding..\n");
1889 found = priv->mcast_vcc;
1890 goto out;
1891 }
1892 /*
1893 * We got here because entry->status == ESI_FLUSH_PENDING
1894 * or BUS flood limit was reached for an entry which is
1895 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1896 */
1897 lec_arp_hold(entry);
1898 *ret_entry = entry;
1899 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1900 entry->vcc);
1901 found = NULL;
1902 } else {
1903 /* No matching entry was found */
1904 entry = make_entry(priv, mac_to_find);
1905 pr_debug("Making entry\n");
1906 if (!entry) {
1907 found = priv->mcast_vcc;
1908 goto out;
1909 }
1910 lec_arp_add(priv, entry);
1911 /* We want arp-request(s) to be sent */
1912 entry->packets_flooded = 1;
1913 entry->status = ESI_ARP_PENDING;
1914 entry->no_tries = 1;
1915 entry->last_used = entry->timestamp = jiffies;
1916 entry->is_rdesc = is_rdesc;
1917 if (entry->is_rdesc)
1918 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1919 NULL);
1920 else
1921 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1922 entry->timer.expires = jiffies + (1 * HZ);
1923 entry->timer.function = lec_arp_expire_arp;
1924 add_timer(&entry->timer);
1925 found = priv->mcast_vcc;
1926 }
1927
1928 out:
1929 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1930 return found;
1931 }
1932
1933 static int
1934 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1935 unsigned long permanent)
1936 {
1937 unsigned long flags;
1938 struct hlist_node *node, *next;
1939 struct lec_arp_table *entry;
1940 int i;
1941
1942 pr_debug("\n");
1943 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1944 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1945 hlist_for_each_entry_safe(entry, node, next,
1946 &priv->lec_arp_tables[i], next) {
1947 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1948 (permanent ||
1949 !(entry->flags & LEC_PERMANENT_FLAG))) {
1950 lec_arp_remove(priv, entry);
1951 lec_arp_put(entry);
1952 }
1953 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1954 return 0;
1955 }
1956 }
1957 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1958 return -1;
1959 }
1960
1961 /*
1962 * Notifies: Response to arp_request (atm_addr != NULL)
1963 */
1964 static void
1965 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1966 const unsigned char *atm_addr, unsigned long remoteflag,
1967 unsigned int targetless_le_arp)
1968 {
1969 unsigned long flags;
1970 struct hlist_node *node, *next;
1971 struct lec_arp_table *entry, *tmp;
1972 int i;
1973
1974 pr_debug("%smac:%pM\n",
1975 (targetless_le_arp) ? "targetless " : "", mac_addr);
1976
1977 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1978 entry = lec_arp_find(priv, mac_addr);
1979 if (entry == NULL && targetless_le_arp)
1980 goto out; /*
1981 * LANE2: ignore targetless LE_ARPs for which
1982 * we have no entry in the cache. 7.1.30
1983 */
1984 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1985 hlist_for_each_entry_safe(entry, node, next,
1986 &priv->lec_arp_empty_ones, next) {
1987 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1988 hlist_del(&entry->next);
1989 del_timer(&entry->timer);
1990 tmp = lec_arp_find(priv, mac_addr);
1991 if (tmp) {
1992 del_timer(&tmp->timer);
1993 tmp->status = ESI_FORWARD_DIRECT;
1994 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1995 tmp->vcc = entry->vcc;
1996 tmp->old_push = entry->old_push;
1997 tmp->last_used = jiffies;
1998 del_timer(&entry->timer);
1999 lec_arp_put(entry);
2000 entry = tmp;
2001 } else {
2002 entry->status = ESI_FORWARD_DIRECT;
2003 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2004 entry->last_used = jiffies;
2005 lec_arp_add(priv, entry);
2006 }
2007 if (remoteflag)
2008 entry->flags |= LEC_REMOTE_FLAG;
2009 else
2010 entry->flags &= ~LEC_REMOTE_FLAG;
2011 pr_debug("After update\n");
2012 dump_arp_table(priv);
2013 goto out;
2014 }
2015 }
2016 }
2017
2018 entry = lec_arp_find(priv, mac_addr);
2019 if (!entry) {
2020 entry = make_entry(priv, mac_addr);
2021 if (!entry)
2022 goto out;
2023 entry->status = ESI_UNKNOWN;
2024 lec_arp_add(priv, entry);
2025 /* Temporary, changes before end of function */
2026 }
2027 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2028 del_timer(&entry->timer);
2029 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2030 hlist_for_each_entry(tmp, node,
2031 &priv->lec_arp_tables[i], next) {
2032 if (entry != tmp &&
2033 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2034 /* Vcc to this host exists */
2035 if (tmp->status > ESI_VC_PENDING) {
2036 /*
2037 * ESI_FLUSH_PENDING,
2038 * ESI_FORWARD_DIRECT
2039 */
2040 entry->vcc = tmp->vcc;
2041 entry->old_push = tmp->old_push;
2042 }
2043 entry->status = tmp->status;
2044 break;
2045 }
2046 }
2047 }
2048 if (remoteflag)
2049 entry->flags |= LEC_REMOTE_FLAG;
2050 else
2051 entry->flags &= ~LEC_REMOTE_FLAG;
2052 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2053 entry->status = ESI_VC_PENDING;
2054 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2055 }
2056 pr_debug("After update2\n");
2057 dump_arp_table(priv);
2058 out:
2059 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2060 }
2061
2062 /*
2063 * Notifies: Vcc setup ready
2064 */
2065 static void
2066 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2067 struct atm_vcc *vcc,
2068 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2069 {
2070 unsigned long flags;
2071 struct hlist_node *node;
2072 struct lec_arp_table *entry;
2073 int i, found_entry = 0;
2074
2075 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2076 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2077 if (ioc_data->receive == 2) {
2078 pr_debug("LEC_ARP: Attaching mcast forward\n");
2079 #if 0
2080 entry = lec_arp_find(priv, bus_mac);
2081 if (!entry) {
2082 pr_info("LEC_ARP: Multicast entry not found!\n");
2083 goto out;
2084 }
2085 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2086 entry->recv_vcc = vcc;
2087 entry->old_recv_push = old_push;
2088 #endif
2089 entry = make_entry(priv, bus_mac);
2090 if (entry == NULL)
2091 goto out;
2092 del_timer(&entry->timer);
2093 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2094 entry->recv_vcc = vcc;
2095 entry->old_recv_push = old_push;
2096 hlist_add_head(&entry->next, &priv->mcast_fwds);
2097 goto out;
2098 } else if (ioc_data->receive == 1) {
2099 /*
2100 * Vcc which we don't want to make default vcc,
2101 * attach it anyway.
2102 */
2103 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2104 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2105 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2106 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2107 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2108 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2109 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2110 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2111 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2112 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2113 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2114 entry = make_entry(priv, bus_mac);
2115 if (entry == NULL)
2116 goto out;
2117 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2118 memset(entry->mac_addr, 0, ETH_ALEN);
2119 entry->recv_vcc = vcc;
2120 entry->old_recv_push = old_push;
2121 entry->status = ESI_UNKNOWN;
2122 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2123 entry->timer.function = lec_arp_expire_vcc;
2124 hlist_add_head(&entry->next, &priv->lec_no_forward);
2125 add_timer(&entry->timer);
2126 dump_arp_table(priv);
2127 goto out;
2128 }
2129 pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2130 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2131 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2132 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2133 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2134 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2135 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2136 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2137 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2138 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2139 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2140 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2141 hlist_for_each_entry(entry, node,
2142 &priv->lec_arp_tables[i], next) {
2143 if (memcmp
2144 (ioc_data->atm_addr, entry->atm_addr,
2145 ATM_ESA_LEN) == 0) {
2146 pr_debug("LEC_ARP: Attaching data direct\n");
2147 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2148 entry->vcc ? entry->vcc->vci : 0,
2149 entry->recv_vcc ? entry->recv_vcc->
2150 vci : 0);
2151 found_entry = 1;
2152 del_timer(&entry->timer);
2153 entry->vcc = vcc;
2154 entry->old_push = old_push;
2155 if (entry->status == ESI_VC_PENDING) {
2156 if (priv->maximum_unknown_frame_count
2157 == 0)
2158 entry->status =
2159 ESI_FORWARD_DIRECT;
2160 else {
2161 entry->timestamp = jiffies;
2162 entry->status =
2163 ESI_FLUSH_PENDING;
2164 #if 0
2165 send_to_lecd(priv, l_flush_xmt,
2166 NULL,
2167 entry->atm_addr,
2168 NULL);
2169 #endif
2170 }
2171 } else {
2172 /*
2173 * They were forming a connection
2174 * to us, and we to them. Our
2175 * ATM address is numerically lower
2176 * than theirs, so we make connection
2177 * we formed into default VCC (8.1.11).
2178 * Connection they made gets torn
2179 * down. This might confuse some
2180 * clients. Can be changed if
2181 * someone reports trouble...
2182 */
2183 ;
2184 }
2185 }
2186 }
2187 }
2188 if (found_entry) {
2189 pr_debug("After vcc was added\n");
2190 dump_arp_table(priv);
2191 goto out;
2192 }
2193 /*
2194 * Not found, snatch address from first data packet that arrives
2195 * from this vcc
2196 */
2197 entry = make_entry(priv, bus_mac);
2198 if (!entry)
2199 goto out;
2200 entry->vcc = vcc;
2201 entry->old_push = old_push;
2202 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2203 memset(entry->mac_addr, 0, ETH_ALEN);
2204 entry->status = ESI_UNKNOWN;
2205 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2206 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2207 entry->timer.function = lec_arp_expire_vcc;
2208 add_timer(&entry->timer);
2209 pr_debug("After vcc was added\n");
2210 dump_arp_table(priv);
2211 out:
2212 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2213 }
2214
2215 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2216 {
2217 unsigned long flags;
2218 struct hlist_node *node;
2219 struct lec_arp_table *entry;
2220 int i;
2221
2222 pr_debug("%lx\n", tran_id);
2223 restart:
2224 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2225 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2226 hlist_for_each_entry(entry, node,
2227 &priv->lec_arp_tables[i], next) {
2228 if (entry->flush_tran_id == tran_id &&
2229 entry->status == ESI_FLUSH_PENDING) {
2230 struct sk_buff *skb;
2231 struct atm_vcc *vcc = entry->vcc;
2232
2233 lec_arp_hold(entry);
2234 spin_unlock_irqrestore(&priv->lec_arp_lock,
2235 flags);
2236 while ((skb = skb_dequeue(&entry->tx_wait)))
2237 lec_send(vcc, skb);
2238 entry->last_used = jiffies;
2239 entry->status = ESI_FORWARD_DIRECT;
2240 lec_arp_put(entry);
2241 pr_debug("LEC_ARP: Flushed\n");
2242 goto restart;
2243 }
2244 }
2245 }
2246 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2247 dump_arp_table(priv);
2248 }
2249
2250 static void
2251 lec_set_flush_tran_id(struct lec_priv *priv,
2252 const unsigned char *atm_addr, unsigned long tran_id)
2253 {
2254 unsigned long flags;
2255 struct hlist_node *node;
2256 struct lec_arp_table *entry;
2257 int i;
2258
2259 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2260 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2261 hlist_for_each_entry(entry, node,
2262 &priv->lec_arp_tables[i], next) {
2263 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2264 entry->flush_tran_id = tran_id;
2265 pr_debug("Set flush transaction id to %lx for %p\n",
2266 tran_id, entry);
2267 }
2268 }
2269 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270 }
2271
2272 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2273 {
2274 unsigned long flags;
2275 unsigned char mac_addr[] = {
2276 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2277 };
2278 struct lec_arp_table *to_add;
2279 struct lec_vcc_priv *vpriv;
2280 int err = 0;
2281
2282 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2283 if (!vpriv)
2284 return -ENOMEM;
2285 vpriv->xoff = 0;
2286 vpriv->old_pop = vcc->pop;
2287 vcc->user_back = vpriv;
2288 vcc->pop = lec_pop;
2289 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2290 to_add = make_entry(priv, mac_addr);
2291 if (!to_add) {
2292 vcc->pop = vpriv->old_pop;
2293 kfree(vpriv);
2294 err = -ENOMEM;
2295 goto out;
2296 }
2297 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2298 to_add->status = ESI_FORWARD_DIRECT;
2299 to_add->flags |= LEC_PERMANENT_FLAG;
2300 to_add->vcc = vcc;
2301 to_add->old_push = vcc->push;
2302 vcc->push = lec_push;
2303 priv->mcast_vcc = vcc;
2304 lec_arp_add(priv, to_add);
2305 out:
2306 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2307 return err;
2308 }
2309
2310 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2311 {
2312 unsigned long flags;
2313 struct hlist_node *node, *next;
2314 struct lec_arp_table *entry;
2315 int i;
2316
2317 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2318 dump_arp_table(priv);
2319
2320 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2321
2322 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2323 hlist_for_each_entry_safe(entry, node, next,
2324 &priv->lec_arp_tables[i], next) {
2325 if (vcc == entry->vcc) {
2326 lec_arp_remove(priv, entry);
2327 lec_arp_put(entry);
2328 if (priv->mcast_vcc == vcc)
2329 priv->mcast_vcc = NULL;
2330 }
2331 }
2332 }
2333
2334 hlist_for_each_entry_safe(entry, node, next,
2335 &priv->lec_arp_empty_ones, next) {
2336 if (entry->vcc == vcc) {
2337 lec_arp_clear_vccs(entry);
2338 del_timer(&entry->timer);
2339 hlist_del(&entry->next);
2340 lec_arp_put(entry);
2341 }
2342 }
2343
2344 hlist_for_each_entry_safe(entry, node, next,
2345 &priv->lec_no_forward, next) {
2346 if (entry->recv_vcc == vcc) {
2347 lec_arp_clear_vccs(entry);
2348 del_timer(&entry->timer);
2349 hlist_del(&entry->next);
2350 lec_arp_put(entry);
2351 }
2352 }
2353
2354 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2355 if (entry->recv_vcc == vcc) {
2356 lec_arp_clear_vccs(entry);
2357 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2358 hlist_del(&entry->next);
2359 lec_arp_put(entry);
2360 }
2361 }
2362
2363 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2364 dump_arp_table(priv);
2365 }
2366
2367 static void
2368 lec_arp_check_empties(struct lec_priv *priv,
2369 struct atm_vcc *vcc, struct sk_buff *skb)
2370 {
2371 unsigned long flags;
2372 struct hlist_node *node, *next;
2373 struct lec_arp_table *entry, *tmp;
2374 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2375 unsigned char *src;
2376 #ifdef CONFIG_TR
2377 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2378
2379 if (priv->is_trdev)
2380 src = tr_hdr->h_source;
2381 else
2382 #endif
2383 src = hdr->h_source;
2384
2385 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2386 hlist_for_each_entry_safe(entry, node, next,
2387 &priv->lec_arp_empty_ones, next) {
2388 if (vcc == entry->vcc) {
2389 del_timer(&entry->timer);
2390 memcpy(entry->mac_addr, src, ETH_ALEN);
2391 entry->status = ESI_FORWARD_DIRECT;
2392 entry->last_used = jiffies;
2393 /* We might have got an entry */
2394 tmp = lec_arp_find(priv, src);
2395 if (tmp) {
2396 lec_arp_remove(priv, tmp);
2397 lec_arp_put(tmp);
2398 }
2399 hlist_del(&entry->next);
2400 lec_arp_add(priv, entry);
2401 goto out;
2402 }
2403 }
2404 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2405 out:
2406 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2407 }
2408
2409 MODULE_LICENSE("GPL");
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