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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/cjktty.git] / net / atm / lec.c
blob38754fdb88babc634717cc2b0cd6eba297e119bd
1 /*
2 * lec.c: Lan Emulation driver
3 *
4 * Marko Kiiskila <mkiiskila@yahoo.com>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
8
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/bitops.h>
12 #include <linux/capability.h>
13
14 /* We are ethernet device */
15 #include <linux/if_ether.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <net/sock.h>
19 #include <linux/skbuff.h>
20 #include <linux/ip.h>
21 #include <asm/byteorder.h>
22 #include <linux/uaccess.h>
23 #include <net/arp.h>
24 #include <net/dst.h>
25 #include <linux/proc_fs.h>
26 #include <linux/spinlock.h>
27 #include <linux/seq_file.h>
28
29 /* TokenRing if needed */
30 #ifdef CONFIG_TR
31 #include <linux/trdevice.h>
32 #endif
33
34 /* And atm device */
35 #include <linux/atmdev.h>
36 #include <linux/atmlec.h>
37
38 /* Proxy LEC knows about bridging */
39 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
40 #include "../bridge/br_private.h"
41
42 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
43 #endif
44
45 /* Modular too */
46 #include <linux/module.h>
47 #include <linux/init.h>
48
49 #include "lec.h"
50 #include "lec_arpc.h"
51 #include "resources.h"
52
53 #define DUMP_PACKETS 0 /*
54 * 0 = None,
55 * 1 = 30 first bytes
56 * 2 = Whole packet
57 */
58
59 #define LEC_UNRES_QUE_LEN 8 /*
60 * number of tx packets to queue for a
61 * single destination while waiting for SVC
62 */
63
64 static int lec_open(struct net_device *dev);
65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
66 struct net_device *dev);
67 static int lec_close(struct net_device *dev);
68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
69 const unsigned char *mac_addr);
70 static int lec_arp_remove(struct lec_priv *priv,
71 struct lec_arp_table *to_remove);
72 /* LANE2 functions */
73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
74 const u8 *tlvs, u32 sizeoftlvs);
75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
76 u8 **tlvs, u32 *sizeoftlvs);
77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
78 const u8 *tlvs, u32 sizeoftlvs);
79
80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
81 unsigned long permanent);
82 static void lec_arp_check_empties(struct lec_priv *priv,
83 struct atm_vcc *vcc, struct sk_buff *skb);
84 static void lec_arp_destroy(struct lec_priv *priv);
85 static void lec_arp_init(struct lec_priv *priv);
86 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
87 const unsigned char *mac_to_find,
88 int is_rdesc,
89 struct lec_arp_table **ret_entry);
90 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
91 const unsigned char *atm_addr,
92 unsigned long remoteflag,
93 unsigned int targetless_le_arp);
94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
96 static void lec_set_flush_tran_id(struct lec_priv *priv,
97 const unsigned char *atm_addr,
98 unsigned long tran_id);
99 static void lec_vcc_added(struct lec_priv *priv,
100 const struct atmlec_ioc *ioc_data,
101 struct atm_vcc *vcc,
102 void (*old_push)(struct atm_vcc *vcc,
103 struct sk_buff *skb));
104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
105
106 /* must be done under lec_arp_lock */
107 static inline void lec_arp_hold(struct lec_arp_table *entry)
108 {
109 atomic_inc(&entry->usage);
110 }
111
112 static inline void lec_arp_put(struct lec_arp_table *entry)
113 {
114 if (atomic_dec_and_test(&entry->usage))
115 kfree(entry);
116 }
117
118 static struct lane2_ops lane2_ops = {
119 lane2_resolve, /* resolve, spec 3.1.3 */
120 lane2_associate_req, /* associate_req, spec 3.1.4 */
121 NULL /* associate indicator, spec 3.1.5 */
122 };
123
124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125
126 /* Device structures */
127 static struct net_device *dev_lec[MAX_LEC_ITF];
128
129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132 struct ethhdr *eth;
133 char *buff;
134 struct lec_priv *priv;
135
136 /*
137 * Check if this is a BPDU. If so, ask zeppelin to send
138 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
139 * as the Config BPDU has
140 */
141 eth = (struct ethhdr *)skb->data;
142 buff = skb->data + skb->dev->hard_header_len;
143 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
144 struct sock *sk;
145 struct sk_buff *skb2;
146 struct atmlec_msg *mesg;
147
148 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
149 if (skb2 == NULL)
150 return;
151 skb2->len = sizeof(struct atmlec_msg);
152 mesg = (struct atmlec_msg *)skb2->data;
153 mesg->type = l_topology_change;
154 buff += 4;
155 mesg->content.normal.flag = *buff & 0x01;
156 /* 0x01 is topology change */
157
158 priv = netdev_priv(dev);
159 atm_force_charge(priv->lecd, skb2->truesize);
160 sk = sk_atm(priv->lecd);
161 skb_queue_tail(&sk->sk_receive_queue, skb2);
162 sk->sk_data_ready(sk, skb2->len);
163 }
164 }
165 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
166
167 /*
168 * Modelled after tr_type_trans
169 * All multicast and ARE or STE frames go to BUS.
170 * Non source routed frames go by destination address.
171 * Last hop source routed frames go by destination address.
172 * Not last hop source routed frames go by _next_ route descriptor.
173 * Returns pointer to destination MAC address or fills in rdesc
174 * and returns NULL.
175 */
176 #ifdef CONFIG_TR
177 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
178 {
179 struct trh_hdr *trh;
180 unsigned int riflen, num_rdsc;
181
182 trh = (struct trh_hdr *)packet;
183 if (trh->daddr[0] & (uint8_t) 0x80)
184 return bus_mac; /* multicast */
185
186 if (trh->saddr[0] & TR_RII) {
187 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
188 if ((ntohs(trh->rcf) >> 13) != 0)
189 return bus_mac; /* ARE or STE */
190 } else
191 return trh->daddr; /* not source routed */
192
193 if (riflen < 6)
194 return trh->daddr; /* last hop, source routed */
195
196 /* riflen is 6 or more, packet has more than one route descriptor */
197 num_rdsc = (riflen / 2) - 1;
198 memset(rdesc, 0, ETH_ALEN);
199 /* offset 4 comes from LAN destination field in LE control frames */
200 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
201 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
202 else {
203 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
204 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
205 }
206
207 return NULL;
208 }
209 #endif /* CONFIG_TR */
210
211 /*
212 * Open/initialize the netdevice. This is called (in the current kernel)
213 * sometime after booting when the 'ifconfig' program is run.
214 *
215 * This routine should set everything up anew at each open, even
216 * registers that "should" only need to be set once at boot, so that
217 * there is non-reboot way to recover if something goes wrong.
218 */
219
220 static int lec_open(struct net_device *dev)
221 {
222 netif_start_queue(dev);
223
224 return 0;
225 }
226
227 static void
228 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
229 {
230 struct net_device *dev = skb->dev;
231
232 ATM_SKB(skb)->vcc = vcc;
233 ATM_SKB(skb)->atm_options = vcc->atm_options;
234
235 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
236 if (vcc->send(vcc, skb) < 0) {
237 dev->stats.tx_dropped++;
238 return;
239 }
240
241 dev->stats.tx_packets++;
242 dev->stats.tx_bytes += skb->len;
243 }
244
245 static void lec_tx_timeout(struct net_device *dev)
246 {
247 pr_info("%s\n", dev->name);
248 dev->trans_start = jiffies;
249 netif_wake_queue(dev);
250 }
251
252 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
253 struct net_device *dev)
254 {
255 struct sk_buff *skb2;
256 struct lec_priv *priv = netdev_priv(dev);
257 struct lecdatahdr_8023 *lec_h;
258 struct atm_vcc *vcc;
259 struct lec_arp_table *entry;
260 unsigned char *dst;
261 int min_frame_size;
262 #ifdef CONFIG_TR
263 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */
264 #endif
265 int is_rdesc;
266
267 pr_debug("called\n");
268 if (!priv->lecd) {
269 pr_info("%s:No lecd attached\n", dev->name);
270 dev->stats.tx_errors++;
271 netif_stop_queue(dev);
272 kfree_skb(skb);
273 return NETDEV_TX_OK;
274 }
275
276 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
277 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
278 (long)skb_end_pointer(skb));
279 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
280 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
281 lec_handle_bridge(skb, dev);
282 #endif
283
284 /* Make sure we have room for lec_id */
285 if (skb_headroom(skb) < 2) {
286 pr_debug("reallocating skb\n");
287 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
288 kfree_skb(skb);
289 if (skb2 == NULL)
290 return NETDEV_TX_OK;
291 skb = skb2;
292 }
293 skb_push(skb, 2);
294
295 /* Put le header to place, works for TokenRing too */
296 lec_h = (struct lecdatahdr_8023 *)skb->data;
297 lec_h->le_header = htons(priv->lecid);
298
299 #ifdef CONFIG_TR
300 /*
301 * Ugly. Use this to realign Token Ring packets for
302 * e.g. PCA-200E driver.
303 */
304 if (priv->is_trdev) {
305 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
306 kfree_skb(skb);
307 if (skb2 == NULL)
308 return NETDEV_TX_OK;
309 skb = skb2;
310 }
311 #endif
312
313 #if DUMP_PACKETS >= 2
314 #define MAX_DUMP_SKB 99
315 #elif DUMP_PACKETS >= 1
316 #define MAX_DUMP_SKB 30
317 #endif
318 #if DUMP_PACKETS >= 1
319 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
320 dev->name, skb->len, priv->lecid);
321 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
322 skb->data, min(skb->len, MAX_DUMP_SKB), true);
323 #endif /* DUMP_PACKETS >= 1 */
324
325 /* Minimum ethernet-frame size */
326 #ifdef CONFIG_TR
327 if (priv->is_trdev)
328 min_frame_size = LEC_MINIMUM_8025_SIZE;
329 else
330 #endif
331 min_frame_size = LEC_MINIMUM_8023_SIZE;
332 if (skb->len < min_frame_size) {
333 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
334 skb2 = skb_copy_expand(skb, 0,
335 min_frame_size - skb->truesize,
336 GFP_ATOMIC);
337 dev_kfree_skb(skb);
338 if (skb2 == NULL) {
339 dev->stats.tx_dropped++;
340 return NETDEV_TX_OK;
341 }
342 skb = skb2;
343 }
344 skb_put(skb, min_frame_size - skb->len);
345 }
346
347 /* Send to right vcc */
348 is_rdesc = 0;
349 dst = lec_h->h_dest;
350 #ifdef CONFIG_TR
351 if (priv->is_trdev) {
352 dst = get_tr_dst(skb->data + 2, rdesc);
353 if (dst == NULL) {
354 dst = rdesc;
355 is_rdesc = 1;
356 }
357 }
358 #endif
359 entry = NULL;
360 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
361 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
362 dev->name, vcc, vcc ? vcc->flags : 0, entry);
363 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
364 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
365 pr_debug("%s:queuing packet, MAC address %pM\n",
366 dev->name, lec_h->h_dest);
367 skb_queue_tail(&entry->tx_wait, skb);
368 } else {
369 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
370 dev->name, lec_h->h_dest);
371 dev->stats.tx_dropped++;
372 dev_kfree_skb(skb);
373 }
374 goto out;
375 }
376 #if DUMP_PACKETS > 0
377 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
378 dev->name, vcc->vpi, vcc->vci);
379 #endif /* DUMP_PACKETS > 0 */
380
381 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
382 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
383 lec_send(vcc, skb2);
384 }
385
386 lec_send(vcc, skb);
387
388 if (!atm_may_send(vcc, 0)) {
389 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
390
391 vpriv->xoff = 1;
392 netif_stop_queue(dev);
393
394 /*
395 * vcc->pop() might have occurred in between, making
396 * the vcc usuable again. Since xmit is serialized,
397 * this is the only situation we have to re-test.
398 */
399
400 if (atm_may_send(vcc, 0))
401 netif_wake_queue(dev);
402 }
403
404 out:
405 if (entry)
406 lec_arp_put(entry);
407 dev->trans_start = jiffies;
408 return NETDEV_TX_OK;
409 }
410
411 /* The inverse routine to net_open(). */
412 static int lec_close(struct net_device *dev)
413 {
414 netif_stop_queue(dev);
415 return 0;
416 }
417
418 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
419 {
420 unsigned long flags;
421 struct net_device *dev = (struct net_device *)vcc->proto_data;
422 struct lec_priv *priv = netdev_priv(dev);
423 struct atmlec_msg *mesg;
424 struct lec_arp_table *entry;
425 int i;
426 char *tmp; /* FIXME */
427
428 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
429 mesg = (struct atmlec_msg *)skb->data;
430 tmp = skb->data;
431 tmp += sizeof(struct atmlec_msg);
432 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
433 switch (mesg->type) {
434 case l_set_mac_addr:
435 for (i = 0; i < 6; i++)
436 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
437 break;
438 case l_del_mac_addr:
439 for (i = 0; i < 6; i++)
440 dev->dev_addr[i] = 0;
441 break;
442 case l_addr_delete:
443 lec_addr_delete(priv, mesg->content.normal.atm_addr,
444 mesg->content.normal.flag);
445 break;
446 case l_topology_change:
447 priv->topology_change = mesg->content.normal.flag;
448 break;
449 case l_flush_complete:
450 lec_flush_complete(priv, mesg->content.normal.flag);
451 break;
452 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
453 spin_lock_irqsave(&priv->lec_arp_lock, flags);
454 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
455 lec_arp_remove(priv, entry);
456 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
457
458 if (mesg->content.normal.no_source_le_narp)
459 break;
460 /* FALL THROUGH */
461 case l_arp_update:
462 lec_arp_update(priv, mesg->content.normal.mac_addr,
463 mesg->content.normal.atm_addr,
464 mesg->content.normal.flag,
465 mesg->content.normal.targetless_le_arp);
466 pr_debug("in l_arp_update\n");
467 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
468 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
469 mesg->sizeoftlvs);
470 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
471 tmp, mesg->sizeoftlvs);
472 }
473 break;
474 case l_config:
475 priv->maximum_unknown_frame_count =
476 mesg->content.config.maximum_unknown_frame_count;
477 priv->max_unknown_frame_time =
478 (mesg->content.config.max_unknown_frame_time * HZ);
479 priv->max_retry_count = mesg->content.config.max_retry_count;
480 priv->aging_time = (mesg->content.config.aging_time * HZ);
481 priv->forward_delay_time =
482 (mesg->content.config.forward_delay_time * HZ);
483 priv->arp_response_time =
484 (mesg->content.config.arp_response_time * HZ);
485 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
486 priv->path_switching_delay =
487 (mesg->content.config.path_switching_delay * HZ);
488 priv->lane_version = mesg->content.config.lane_version;
489 /* LANE2 */
490 priv->lane2_ops = NULL;
491 if (priv->lane_version > 1)
492 priv->lane2_ops = &lane2_ops;
493 if (dev_set_mtu(dev, mesg->content.config.mtu))
494 pr_info("%s: change_mtu to %d failed\n",
495 dev->name, mesg->content.config.mtu);
496 priv->is_proxy = mesg->content.config.is_proxy;
497 break;
498 case l_flush_tran_id:
499 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
500 mesg->content.normal.flag);
501 break;
502 case l_set_lecid:
503 priv->lecid =
504 (unsigned short)(0xffff & mesg->content.normal.flag);
505 break;
506 case l_should_bridge:
507 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
508 {
509 pr_debug("%s: bridge zeppelin asks about %pM\n",
510 dev->name, mesg->content.proxy.mac_addr);
511
512 if (br_fdb_test_addr_hook == NULL)
513 break;
514
515 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
516 /* hit from bridge table, send LE_ARP_RESPONSE */
517 struct sk_buff *skb2;
518 struct sock *sk;
519
520 pr_debug("%s: entry found, responding to zeppelin\n",
521 dev->name);
522 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
523 if (skb2 == NULL)
524 break;
525 skb2->len = sizeof(struct atmlec_msg);
526 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
527 atm_force_charge(priv->lecd, skb2->truesize);
528 sk = sk_atm(priv->lecd);
529 skb_queue_tail(&sk->sk_receive_queue, skb2);
530 sk->sk_data_ready(sk, skb2->len);
531 }
532 }
533 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
534 break;
535 default:
536 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
537 dev_kfree_skb(skb);
538 return -EINVAL;
539 }
540 dev_kfree_skb(skb);
541 return 0;
542 }
543
544 static void lec_atm_close(struct atm_vcc *vcc)
545 {
546 struct sk_buff *skb;
547 struct net_device *dev = (struct net_device *)vcc->proto_data;
548 struct lec_priv *priv = netdev_priv(dev);
549
550 priv->lecd = NULL;
551 /* Do something needful? */
552
553 netif_stop_queue(dev);
554 lec_arp_destroy(priv);
555
556 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
557 pr_info("%s closing with messages pending\n", dev->name);
558 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
559 atm_return(vcc, skb->truesize);
560 dev_kfree_skb(skb);
561 }
562
563 pr_info("%s: Shut down!\n", dev->name);
564 module_put(THIS_MODULE);
565 }
566
567 static struct atmdev_ops lecdev_ops = {
568 .close = lec_atm_close,
569 .send = lec_atm_send
570 };
571
572 static struct atm_dev lecatm_dev = {
573 .ops = &lecdev_ops,
574 .type = "lec",
575 .number = 999, /* dummy device number */
576 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
577 };
578
579 /*
580 * LANE2: new argument struct sk_buff *data contains
581 * the LE_ARP based TLVs introduced in the LANE2 spec
582 */
583 static int
584 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
585 const unsigned char *mac_addr, const unsigned char *atm_addr,
586 struct sk_buff *data)
587 {
588 struct sock *sk;
589 struct sk_buff *skb;
590 struct atmlec_msg *mesg;
591
592 if (!priv || !priv->lecd)
593 return -1;
594 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
595 if (!skb)
596 return -1;
597 skb->len = sizeof(struct atmlec_msg);
598 mesg = (struct atmlec_msg *)skb->data;
599 memset(mesg, 0, sizeof(struct atmlec_msg));
600 mesg->type = type;
601 if (data != NULL)
602 mesg->sizeoftlvs = data->len;
603 if (mac_addr)
604 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
605 else
606 mesg->content.normal.targetless_le_arp = 1;
607 if (atm_addr)
608 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
609
610 atm_force_charge(priv->lecd, skb->truesize);
611 sk = sk_atm(priv->lecd);
612 skb_queue_tail(&sk->sk_receive_queue, skb);
613 sk->sk_data_ready(sk, skb->len);
614
615 if (data != NULL) {
616 pr_debug("about to send %d bytes of data\n", data->len);
617 atm_force_charge(priv->lecd, data->truesize);
618 skb_queue_tail(&sk->sk_receive_queue, data);
619 sk->sk_data_ready(sk, skb->len);
620 }
621
622 return 0;
623 }
624
625 /* shamelessly stolen from drivers/net/net_init.c */
626 static int lec_change_mtu(struct net_device *dev, int new_mtu)
627 {
628 if ((new_mtu < 68) || (new_mtu > 18190))
629 return -EINVAL;
630 dev->mtu = new_mtu;
631 return 0;
632 }
633
634 static void lec_set_multicast_list(struct net_device *dev)
635 {
636 /*
637 * by default, all multicast frames arrive over the bus.
638 * eventually support selective multicast service
639 */
640 }
641
642 static const struct net_device_ops lec_netdev_ops = {
643 .ndo_open = lec_open,
644 .ndo_stop = lec_close,
645 .ndo_start_xmit = lec_start_xmit,
646 .ndo_change_mtu = lec_change_mtu,
647 .ndo_tx_timeout = lec_tx_timeout,
648 .ndo_set_multicast_list = lec_set_multicast_list,
649 };
650
651 static const unsigned char lec_ctrl_magic[] = {
652 0xff,
653 0x00,
654 0x01,
655 0x01
656 };
657
658 #define LEC_DATA_DIRECT_8023 2
659 #define LEC_DATA_DIRECT_8025 3
660
661 static int lec_is_data_direct(struct atm_vcc *vcc)
662 {
663 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
664 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
665 }
666
667 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
668 {
669 unsigned long flags;
670 struct net_device *dev = (struct net_device *)vcc->proto_data;
671 struct lec_priv *priv = netdev_priv(dev);
672
673 #if DUMP_PACKETS > 0
674 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
675 dev->name, vcc->vpi, vcc->vci);
676 #endif
677 if (!skb) {
678 pr_debug("%s: null skb\n", dev->name);
679 lec_vcc_close(priv, vcc);
680 return;
681 }
682 #if DUMP_PACKETS >= 2
683 #define MAX_SKB_DUMP 99
684 #elif DUMP_PACKETS >= 1
685 #define MAX_SKB_DUMP 30
686 #endif
687 #if DUMP_PACKETS > 0
688 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
689 dev->name, skb->len, priv->lecid);
690 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
691 skb->data, min(MAX_SKB_DUMP, skb->len), true);
692 #endif /* DUMP_PACKETS > 0 */
693 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
694 /* Control frame, to daemon */
695 struct sock *sk = sk_atm(vcc);
696
697 pr_debug("%s: To daemon\n", dev->name);
698 skb_queue_tail(&sk->sk_receive_queue, skb);
699 sk->sk_data_ready(sk, skb->len);
700 } else { /* Data frame, queue to protocol handlers */
701 struct lec_arp_table *entry;
702 unsigned char *src, *dst;
703
704 atm_return(vcc, skb->truesize);
705 if (*(__be16 *) skb->data == htons(priv->lecid) ||
706 !priv->lecd || !(dev->flags & IFF_UP)) {
707 /*
708 * Probably looping back, or if lecd is missing,
709 * lecd has gone down
710 */
711 pr_debug("Ignoring frame...\n");
712 dev_kfree_skb(skb);
713 return;
714 }
715 #ifdef CONFIG_TR
716 if (priv->is_trdev)
717 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
718 else
719 #endif
720 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
721
722 /*
723 * If this is a Data Direct VCC, and the VCC does not match
724 * the LE_ARP cache entry, delete the LE_ARP cache entry.
725 */
726 spin_lock_irqsave(&priv->lec_arp_lock, flags);
727 if (lec_is_data_direct(vcc)) {
728 #ifdef CONFIG_TR
729 if (priv->is_trdev)
730 src =
731 ((struct lecdatahdr_8025 *)skb->data)->
732 h_source;
733 else
734 #endif
735 src =
736 ((struct lecdatahdr_8023 *)skb->data)->
737 h_source;
738 entry = lec_arp_find(priv, src);
739 if (entry && entry->vcc != vcc) {
740 lec_arp_remove(priv, entry);
741 lec_arp_put(entry);
742 }
743 }
744 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
745
746 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
747 !priv->is_proxy && /* Proxy wants all the packets */
748 memcmp(dst, dev->dev_addr, dev->addr_len)) {
749 dev_kfree_skb(skb);
750 return;
751 }
752 if (!hlist_empty(&priv->lec_arp_empty_ones))
753 lec_arp_check_empties(priv, vcc, skb);
754 skb_pull(skb, 2); /* skip lec_id */
755 #ifdef CONFIG_TR
756 if (priv->is_trdev)
757 skb->protocol = tr_type_trans(skb, dev);
758 else
759 #endif
760 skb->protocol = eth_type_trans(skb, dev);
761 dev->stats.rx_packets++;
762 dev->stats.rx_bytes += skb->len;
763 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
764 netif_rx(skb);
765 }
766 }
767
768 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
769 {
770 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
771 struct net_device *dev = skb->dev;
772
773 if (vpriv == NULL) {
774 pr_info("vpriv = NULL!?!?!?\n");
775 return;
776 }
777
778 vpriv->old_pop(vcc, skb);
779
780 if (vpriv->xoff && atm_may_send(vcc, 0)) {
781 vpriv->xoff = 0;
782 if (netif_running(dev) && netif_queue_stopped(dev))
783 netif_wake_queue(dev);
784 }
785 }
786
787 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
788 {
789 struct lec_vcc_priv *vpriv;
790 int bytes_left;
791 struct atmlec_ioc ioc_data;
792
793 /* Lecd must be up in this case */
794 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
795 if (bytes_left != 0)
796 pr_info("copy from user failed for %d bytes\n", bytes_left);
797 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
798 !dev_lec[ioc_data.dev_num])
799 return -EINVAL;
800 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
801 if (!vpriv)
802 return -ENOMEM;
803 vpriv->xoff = 0;
804 vpriv->old_pop = vcc->pop;
805 vcc->user_back = vpriv;
806 vcc->pop = lec_pop;
807 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
808 &ioc_data, vcc, vcc->push);
809 vcc->proto_data = dev_lec[ioc_data.dev_num];
810 vcc->push = lec_push;
811 return 0;
812 }
813
814 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
815 {
816 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
817 return -EINVAL;
818 vcc->proto_data = dev_lec[arg];
819 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
820 }
821
822 /* Initialize device. */
823 static int lecd_attach(struct atm_vcc *vcc, int arg)
824 {
825 int i;
826 struct lec_priv *priv;
827
828 if (arg < 0)
829 i = 0;
830 else
831 i = arg;
832 #ifdef CONFIG_TR
833 if (arg >= MAX_LEC_ITF)
834 return -EINVAL;
835 #else /* Reserve the top NUM_TR_DEVS for TR */
836 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
837 return -EINVAL;
838 #endif
839 if (!dev_lec[i]) {
840 int is_trdev, size;
841
842 is_trdev = 0;
843 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
844 is_trdev = 1;
845
846 size = sizeof(struct lec_priv);
847 #ifdef CONFIG_TR
848 if (is_trdev)
849 dev_lec[i] = alloc_trdev(size);
850 else
851 #endif
852 dev_lec[i] = alloc_etherdev(size);
853 if (!dev_lec[i])
854 return -ENOMEM;
855 dev_lec[i]->netdev_ops = &lec_netdev_ops;
856 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
857 if (register_netdev(dev_lec[i])) {
858 free_netdev(dev_lec[i]);
859 return -EINVAL;
860 }
861
862 priv = netdev_priv(dev_lec[i]);
863 priv->is_trdev = is_trdev;
864 } else {
865 priv = netdev_priv(dev_lec[i]);
866 if (priv->lecd)
867 return -EADDRINUSE;
868 }
869 lec_arp_init(priv);
870 priv->itfnum = i; /* LANE2 addition */
871 priv->lecd = vcc;
872 vcc->dev = &lecatm_dev;
873 vcc_insert_socket(sk_atm(vcc));
874
875 vcc->proto_data = dev_lec[i];
876 set_bit(ATM_VF_META, &vcc->flags);
877 set_bit(ATM_VF_READY, &vcc->flags);
878
879 /* Set default values to these variables */
880 priv->maximum_unknown_frame_count = 1;
881 priv->max_unknown_frame_time = (1 * HZ);
882 priv->vcc_timeout_period = (1200 * HZ);
883 priv->max_retry_count = 1;
884 priv->aging_time = (300 * HZ);
885 priv->forward_delay_time = (15 * HZ);
886 priv->topology_change = 0;
887 priv->arp_response_time = (1 * HZ);
888 priv->flush_timeout = (4 * HZ);
889 priv->path_switching_delay = (6 * HZ);
890
891 if (dev_lec[i]->flags & IFF_UP)
892 netif_start_queue(dev_lec[i]);
893 __module_get(THIS_MODULE);
894 return i;
895 }
896
897 #ifdef CONFIG_PROC_FS
898 static const char *lec_arp_get_status_string(unsigned char status)
899 {
900 static const char *const lec_arp_status_string[] = {
901 "ESI_UNKNOWN ",
902 "ESI_ARP_PENDING ",
903 "ESI_VC_PENDING ",
904 "<Undefined> ",
905 "ESI_FLUSH_PENDING ",
906 "ESI_FORWARD_DIRECT"
907 };
908
909 if (status > ESI_FORWARD_DIRECT)
910 status = 3; /* ESI_UNDEFINED */
911 return lec_arp_status_string[status];
912 }
913
914 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
915 {
916 int i;
917
918 for (i = 0; i < ETH_ALEN; i++)
919 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
920 seq_printf(seq, " ");
921 for (i = 0; i < ATM_ESA_LEN; i++)
922 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
923 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
924 entry->flags & 0xffff);
925 if (entry->vcc)
926 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
927 else
928 seq_printf(seq, " ");
929 if (entry->recv_vcc) {
930 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
931 entry->recv_vcc->vci);
932 }
933 seq_putc(seq, '\n');
934 }
935
936 struct lec_state {
937 unsigned long flags;
938 struct lec_priv *locked;
939 struct hlist_node *node;
940 struct net_device *dev;
941 int itf;
942 int arp_table;
943 int misc_table;
944 };
945
946 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
947 loff_t *l)
948 {
949 struct hlist_node *e = state->node;
950 struct lec_arp_table *tmp;
951
952 if (!e)
953 e = tbl->first;
954 if (e == SEQ_START_TOKEN) {
955 e = tbl->first;
956 --*l;
957 }
958
959 hlist_for_each_entry_from(tmp, e, next) {
960 if (--*l < 0)
961 break;
962 }
963 state->node = e;
964
965 return (*l < 0) ? state : NULL;
966 }
967
968 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
969 struct lec_priv *priv)
970 {
971 void *v = NULL;
972 int p;
973
974 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
975 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
976 if (v)
977 break;
978 }
979 state->arp_table = p;
980 return v;
981 }
982
983 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
984 struct lec_priv *priv)
985 {
986 struct hlist_head *lec_misc_tables[] = {
987 &priv->lec_arp_empty_ones,
988 &priv->lec_no_forward,
989 &priv->mcast_fwds
990 };
991 void *v = NULL;
992 int q;
993
994 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
995 v = lec_tbl_walk(state, lec_misc_tables[q], l);
996 if (v)
997 break;
998 }
999 state->misc_table = q;
1000 return v;
1001 }
1002
1003 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1004 struct lec_priv *priv)
1005 {
1006 if (!state->locked) {
1007 state->locked = priv;
1008 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1009 }
1010 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1011 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1012 state->locked = NULL;
1013 /* Partial state reset for the next time we get called */
1014 state->arp_table = state->misc_table = 0;
1015 }
1016 return state->locked;
1017 }
1018
1019 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1020 {
1021 struct net_device *dev;
1022 void *v;
1023
1024 dev = state->dev ? state->dev : dev_lec[state->itf];
1025 v = (dev && netdev_priv(dev)) ?
1026 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1027 if (!v && dev) {
1028 dev_put(dev);
1029 /* Partial state reset for the next time we get called */
1030 dev = NULL;
1031 }
1032 state->dev = dev;
1033 return v;
1034 }
1035
1036 static void *lec_get_idx(struct lec_state *state, loff_t l)
1037 {
1038 void *v = NULL;
1039
1040 for (; state->itf < MAX_LEC_ITF; state->itf++) {
1041 v = lec_itf_walk(state, &l);
1042 if (v)
1043 break;
1044 }
1045 return v;
1046 }
1047
1048 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1049 {
1050 struct lec_state *state = seq->private;
1051
1052 state->itf = 0;
1053 state->dev = NULL;
1054 state->locked = NULL;
1055 state->arp_table = 0;
1056 state->misc_table = 0;
1057 state->node = SEQ_START_TOKEN;
1058
1059 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1060 }
1061
1062 static void lec_seq_stop(struct seq_file *seq, void *v)
1063 {
1064 struct lec_state *state = seq->private;
1065
1066 if (state->dev) {
1067 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1068 state->flags);
1069 dev_put(state->dev);
1070 }
1071 }
1072
1073 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1074 {
1075 struct lec_state *state = seq->private;
1076
1077 v = lec_get_idx(state, 1);
1078 *pos += !!PTR_ERR(v);
1079 return v;
1080 }
1081
1082 static int lec_seq_show(struct seq_file *seq, void *v)
1083 {
1084 static const char lec_banner[] =
1085 "Itf MAC ATM destination"
1086 " Status Flags "
1087 "VPI/VCI Recv VPI/VCI\n";
1088
1089 if (v == SEQ_START_TOKEN)
1090 seq_puts(seq, lec_banner);
1091 else {
1092 struct lec_state *state = seq->private;
1093 struct net_device *dev = state->dev;
1094 struct lec_arp_table *entry = hlist_entry(state->node,
1095 struct lec_arp_table,
1096 next);
1097
1098 seq_printf(seq, "%s ", dev->name);
1099 lec_info(seq, entry);
1100 }
1101 return 0;
1102 }
1103
1104 static const struct seq_operations lec_seq_ops = {
1105 .start = lec_seq_start,
1106 .next = lec_seq_next,
1107 .stop = lec_seq_stop,
1108 .show = lec_seq_show,
1109 };
1110
1111 static int lec_seq_open(struct inode *inode, struct file *file)
1112 {
1113 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1114 }
1115
1116 static const struct file_operations lec_seq_fops = {
1117 .owner = THIS_MODULE,
1118 .open = lec_seq_open,
1119 .read = seq_read,
1120 .llseek = seq_lseek,
1121 .release = seq_release_private,
1122 };
1123 #endif
1124
1125 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1126 {
1127 struct atm_vcc *vcc = ATM_SD(sock);
1128 int err = 0;
1129
1130 switch (cmd) {
1131 case ATMLEC_CTRL:
1132 case ATMLEC_MCAST:
1133 case ATMLEC_DATA:
1134 if (!capable(CAP_NET_ADMIN))
1135 return -EPERM;
1136 break;
1137 default:
1138 return -ENOIOCTLCMD;
1139 }
1140
1141 switch (cmd) {
1142 case ATMLEC_CTRL:
1143 err = lecd_attach(vcc, (int)arg);
1144 if (err >= 0)
1145 sock->state = SS_CONNECTED;
1146 break;
1147 case ATMLEC_MCAST:
1148 err = lec_mcast_attach(vcc, (int)arg);
1149 break;
1150 case ATMLEC_DATA:
1151 err = lec_vcc_attach(vcc, (void __user *)arg);
1152 break;
1153 }
1154
1155 return err;
1156 }
1157
1158 static struct atm_ioctl lane_ioctl_ops = {
1159 .owner = THIS_MODULE,
1160 .ioctl = lane_ioctl,
1161 };
1162
1163 static int __init lane_module_init(void)
1164 {
1165 #ifdef CONFIG_PROC_FS
1166 struct proc_dir_entry *p;
1167
1168 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1169 if (!p) {
1170 pr_err("Unable to initialize /proc/net/atm/lec\n");
1171 return -ENOMEM;
1172 }
1173 #endif
1174
1175 register_atm_ioctl(&lane_ioctl_ops);
1176 pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1177 return 0;
1178 }
1179
1180 static void __exit lane_module_cleanup(void)
1181 {
1182 int i;
1183 struct lec_priv *priv;
1184
1185 remove_proc_entry("lec", atm_proc_root);
1186
1187 deregister_atm_ioctl(&lane_ioctl_ops);
1188
1189 for (i = 0; i < MAX_LEC_ITF; i++) {
1190 if (dev_lec[i] != NULL) {
1191 priv = netdev_priv(dev_lec[i]);
1192 unregister_netdev(dev_lec[i]);
1193 free_netdev(dev_lec[i]);
1194 dev_lec[i] = NULL;
1195 }
1196 }
1197 }
1198
1199 module_init(lane_module_init);
1200 module_exit(lane_module_cleanup);
1201
1202 /*
1203 * LANE2: 3.1.3, LE_RESOLVE.request
1204 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1205 * If sizeoftlvs == NULL the default TLVs associated with with this
1206 * lec will be used.
1207 * If dst_mac == NULL, targetless LE_ARP will be sent
1208 */
1209 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1210 u8 **tlvs, u32 *sizeoftlvs)
1211 {
1212 unsigned long flags;
1213 struct lec_priv *priv = netdev_priv(dev);
1214 struct lec_arp_table *table;
1215 struct sk_buff *skb;
1216 int retval;
1217
1218 if (force == 0) {
1219 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1220 table = lec_arp_find(priv, dst_mac);
1221 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1222 if (table == NULL)
1223 return -1;
1224
1225 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1226 if (*tlvs == NULL)
1227 return -1;
1228
1229 *sizeoftlvs = table->sizeoftlvs;
1230
1231 return 0;
1232 }
1233
1234 if (sizeoftlvs == NULL)
1235 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1236
1237 else {
1238 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1239 if (skb == NULL)
1240 return -1;
1241 skb->len = *sizeoftlvs;
1242 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1243 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1244 }
1245 return retval;
1246 }
1247
1248 /*
1249 * LANE2: 3.1.4, LE_ASSOCIATE.request
1250 * Associate the *tlvs with the *lan_dst address.
1251 * Will overwrite any previous association
1252 * Returns 1 for success, 0 for failure (out of memory)
1253 *
1254 */
1255 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1256 const u8 *tlvs, u32 sizeoftlvs)
1257 {
1258 int retval;
1259 struct sk_buff *skb;
1260 struct lec_priv *priv = netdev_priv(dev);
1261
1262 if (compare_ether_addr(lan_dst, dev->dev_addr))
1263 return 0; /* not our mac address */
1264
1265 kfree(priv->tlvs); /* NULL if there was no previous association */
1266
1267 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1268 if (priv->tlvs == NULL)
1269 return 0;
1270 priv->sizeoftlvs = sizeoftlvs;
1271
1272 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1273 if (skb == NULL)
1274 return 0;
1275 skb->len = sizeoftlvs;
1276 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1277 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1278 if (retval != 0)
1279 pr_info("lec.c: lane2_associate_req() failed\n");
1280 /*
1281 * If the previous association has changed we must
1282 * somehow notify other LANE entities about the change
1283 */
1284 return 1;
1285 }
1286
1287 /*
1288 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1289 *
1290 */
1291 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1292 const u8 *tlvs, u32 sizeoftlvs)
1293 {
1294 #if 0
1295 int i = 0;
1296 #endif
1297 struct lec_priv *priv = netdev_priv(dev);
1298 #if 0 /*
1299 * Why have the TLVs in LE_ARP entries
1300 * since we do not use them? When you
1301 * uncomment this code, make sure the
1302 * TLVs get freed when entry is killed
1303 */
1304 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1305
1306 if (entry == NULL)
1307 return; /* should not happen */
1308
1309 kfree(entry->tlvs);
1310
1311 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1312 if (entry->tlvs == NULL)
1313 return;
1314 entry->sizeoftlvs = sizeoftlvs;
1315 #endif
1316 #if 0
1317 pr_info("\n");
1318 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1319 while (i < sizeoftlvs)
1320 pr_cont("%02x ", tlvs[i++]);
1321
1322 pr_cont("\n");
1323 #endif
1324
1325 /* tell MPOA about the TLVs we saw */
1326 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1327 priv->lane2_ops->associate_indicator(dev, mac_addr,
1328 tlvs, sizeoftlvs);
1329 }
1330 }
1331
1332 /*
1333 * Here starts what used to lec_arpc.c
1334 *
1335 * lec_arpc.c was added here when making
1336 * lane client modular. October 1997
1337 */
1338
1339 #include <linux/types.h>
1340 #include <linux/timer.h>
1341 #include <linux/param.h>
1342 #include <asm/atomic.h>
1343 #include <linux/inetdevice.h>
1344 #include <net/route.h>
1345
1346 #if 0
1347 #define pr_debug(format, args...)
1348 /*
1349 #define pr_debug printk
1350 */
1351 #endif
1352 #define DEBUG_ARP_TABLE 0
1353
1354 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1355
1356 static void lec_arp_check_expire(struct work_struct *work);
1357 static void lec_arp_expire_arp(unsigned long data);
1358
1359 /*
1360 * Arp table funcs
1361 */
1362
1363 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1364
1365 /*
1366 * Initialization of arp-cache
1367 */
1368 static void lec_arp_init(struct lec_priv *priv)
1369 {
1370 unsigned short i;
1371
1372 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1373 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1374 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1375 INIT_HLIST_HEAD(&priv->lec_no_forward);
1376 INIT_HLIST_HEAD(&priv->mcast_fwds);
1377 spin_lock_init(&priv->lec_arp_lock);
1378 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1379 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1380 }
1381
1382 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1383 {
1384 if (entry->vcc) {
1385 struct atm_vcc *vcc = entry->vcc;
1386 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1387 struct net_device *dev = (struct net_device *)vcc->proto_data;
1388
1389 vcc->pop = vpriv->old_pop;
1390 if (vpriv->xoff)
1391 netif_wake_queue(dev);
1392 kfree(vpriv);
1393 vcc->user_back = NULL;
1394 vcc->push = entry->old_push;
1395 vcc_release_async(vcc, -EPIPE);
1396 entry->vcc = NULL;
1397 }
1398 if (entry->recv_vcc) {
1399 entry->recv_vcc->push = entry->old_recv_push;
1400 vcc_release_async(entry->recv_vcc, -EPIPE);
1401 entry->recv_vcc = NULL;
1402 }
1403 }
1404
1405 /*
1406 * Insert entry to lec_arp_table
1407 * LANE2: Add to the end of the list to satisfy 8.1.13
1408 */
1409 static inline void
1410 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1411 {
1412 struct hlist_head *tmp;
1413
1414 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1415 hlist_add_head(&entry->next, tmp);
1416
1417 pr_debug("Added entry:%pM\n", entry->mac_addr);
1418 }
1419
1420 /*
1421 * Remove entry from lec_arp_table
1422 */
1423 static int
1424 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1425 {
1426 struct hlist_node *node;
1427 struct lec_arp_table *entry;
1428 int i, remove_vcc = 1;
1429
1430 if (!to_remove)
1431 return -1;
1432
1433 hlist_del(&to_remove->next);
1434 del_timer(&to_remove->timer);
1435
1436 /*
1437 * If this is the only MAC connected to this VCC,
1438 * also tear down the VCC
1439 */
1440 if (to_remove->status >= ESI_FLUSH_PENDING) {
1441 /*
1442 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1443 */
1444 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1445 hlist_for_each_entry(entry, node,
1446 &priv->lec_arp_tables[i], next) {
1447 if (memcmp(to_remove->atm_addr,
1448 entry->atm_addr, ATM_ESA_LEN) == 0) {
1449 remove_vcc = 0;
1450 break;
1451 }
1452 }
1453 }
1454 if (remove_vcc)
1455 lec_arp_clear_vccs(to_remove);
1456 }
1457 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1458
1459 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1460 return 0;
1461 }
1462
1463 #if DEBUG_ARP_TABLE
1464 static const char *get_status_string(unsigned char st)
1465 {
1466 switch (st) {
1467 case ESI_UNKNOWN:
1468 return "ESI_UNKNOWN";
1469 case ESI_ARP_PENDING:
1470 return "ESI_ARP_PENDING";
1471 case ESI_VC_PENDING:
1472 return "ESI_VC_PENDING";
1473 case ESI_FLUSH_PENDING:
1474 return "ESI_FLUSH_PENDING";
1475 case ESI_FORWARD_DIRECT:
1476 return "ESI_FORWARD_DIRECT";
1477 }
1478 return "<UNKNOWN>";
1479 }
1480
1481 static void dump_arp_table(struct lec_priv *priv)
1482 {
1483 struct hlist_node *node;
1484 struct lec_arp_table *rulla;
1485 char buf[256];
1486 int i, j, offset;
1487
1488 pr_info("Dump %p:\n", priv);
1489 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1490 hlist_for_each_entry(rulla, node,
1491 &priv->lec_arp_tables[i], next) {
1492 offset = 0;
1493 offset += sprintf(buf, "%d: %p\n", i, rulla);
1494 offset += sprintf(buf + offset, "Mac: %pM",
1495 rulla->mac_addr);
1496 offset += sprintf(buf + offset, " Atm:");
1497 for (j = 0; j < ATM_ESA_LEN; j++) {
1498 offset += sprintf(buf + offset,
1499 "%2.2x ",
1500 rulla->atm_addr[j] & 0xff);
1501 }
1502 offset += sprintf(buf + offset,
1503 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1504 rulla->vcc ? rulla->vcc->vpi : 0,
1505 rulla->vcc ? rulla->vcc->vci : 0,
1506 rulla->recv_vcc ? rulla->recv_vcc->
1507 vpi : 0,
1508 rulla->recv_vcc ? rulla->recv_vcc->
1509 vci : 0, rulla->last_used,
1510 rulla->timestamp, rulla->no_tries);
1511 offset +=
1512 sprintf(buf + offset,
1513 "Flags:%x, Packets_flooded:%x, Status: %s ",
1514 rulla->flags, rulla->packets_flooded,
1515 get_status_string(rulla->status));
1516 pr_info("%s\n", buf);
1517 }
1518 }
1519
1520 if (!hlist_empty(&priv->lec_no_forward))
1521 pr_info("No forward\n");
1522 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1523 offset = 0;
1524 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1525 offset += sprintf(buf + offset, " Atm:");
1526 for (j = 0; j < ATM_ESA_LEN; j++) {
1527 offset += sprintf(buf + offset, "%2.2x ",
1528 rulla->atm_addr[j] & 0xff);
1529 }
1530 offset += sprintf(buf + offset,
1531 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1532 rulla->vcc ? rulla->vcc->vpi : 0,
1533 rulla->vcc ? rulla->vcc->vci : 0,
1534 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1535 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1536 rulla->last_used,
1537 rulla->timestamp, rulla->no_tries);
1538 offset += sprintf(buf + offset,
1539 "Flags:%x, Packets_flooded:%x, Status: %s ",
1540 rulla->flags, rulla->packets_flooded,
1541 get_status_string(rulla->status));
1542 pr_info("%s\n", buf);
1543 }
1544
1545 if (!hlist_empty(&priv->lec_arp_empty_ones))
1546 pr_info("Empty ones\n");
1547 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1548 offset = 0;
1549 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1550 offset += sprintf(buf + offset, " Atm:");
1551 for (j = 0; j < ATM_ESA_LEN; j++) {
1552 offset += sprintf(buf + offset, "%2.2x ",
1553 rulla->atm_addr[j] & 0xff);
1554 }
1555 offset += sprintf(buf + offset,
1556 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1557 rulla->vcc ? rulla->vcc->vpi : 0,
1558 rulla->vcc ? rulla->vcc->vci : 0,
1559 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1560 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1561 rulla->last_used,
1562 rulla->timestamp, rulla->no_tries);
1563 offset += sprintf(buf + offset,
1564 "Flags:%x, Packets_flooded:%x, Status: %s ",
1565 rulla->flags, rulla->packets_flooded,
1566 get_status_string(rulla->status));
1567 pr_info("%s", buf);
1568 }
1569
1570 if (!hlist_empty(&priv->mcast_fwds))
1571 pr_info("Multicast Forward VCCs\n");
1572 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1573 offset = 0;
1574 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1575 offset += sprintf(buf + offset, " Atm:");
1576 for (j = 0; j < ATM_ESA_LEN; j++) {
1577 offset += sprintf(buf + offset, "%2.2x ",
1578 rulla->atm_addr[j] & 0xff);
1579 }
1580 offset += sprintf(buf + offset,
1581 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1582 rulla->vcc ? rulla->vcc->vpi : 0,
1583 rulla->vcc ? rulla->vcc->vci : 0,
1584 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1585 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1586 rulla->last_used,
1587 rulla->timestamp, rulla->no_tries);
1588 offset += sprintf(buf + offset,
1589 "Flags:%x, Packets_flooded:%x, Status: %s ",
1590 rulla->flags, rulla->packets_flooded,
1591 get_status_string(rulla->status));
1592 pr_info("%s\n", buf);
1593 }
1594
1595 }
1596 #else
1597 #define dump_arp_table(priv) do { } while (0)
1598 #endif
1599
1600 /*
1601 * Destruction of arp-cache
1602 */
1603 static void lec_arp_destroy(struct lec_priv *priv)
1604 {
1605 unsigned long flags;
1606 struct hlist_node *node, *next;
1607 struct lec_arp_table *entry;
1608 int i;
1609
1610 cancel_delayed_work_sync(&priv->lec_arp_work);
1611
1612 /*
1613 * Remove all entries
1614 */
1615
1616 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1617 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1618 hlist_for_each_entry_safe(entry, node, next,
1619 &priv->lec_arp_tables[i], next) {
1620 lec_arp_remove(priv, entry);
1621 lec_arp_put(entry);
1622 }
1623 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1624 }
1625
1626 hlist_for_each_entry_safe(entry, node, next,
1627 &priv->lec_arp_empty_ones, next) {
1628 del_timer_sync(&entry->timer);
1629 lec_arp_clear_vccs(entry);
1630 hlist_del(&entry->next);
1631 lec_arp_put(entry);
1632 }
1633 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1634
1635 hlist_for_each_entry_safe(entry, node, next,
1636 &priv->lec_no_forward, next) {
1637 del_timer_sync(&entry->timer);
1638 lec_arp_clear_vccs(entry);
1639 hlist_del(&entry->next);
1640 lec_arp_put(entry);
1641 }
1642 INIT_HLIST_HEAD(&priv->lec_no_forward);
1643
1644 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1645 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1646 lec_arp_clear_vccs(entry);
1647 hlist_del(&entry->next);
1648 lec_arp_put(entry);
1649 }
1650 INIT_HLIST_HEAD(&priv->mcast_fwds);
1651 priv->mcast_vcc = NULL;
1652 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1653 }
1654
1655 /*
1656 * Find entry by mac_address
1657 */
1658 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1659 const unsigned char *mac_addr)
1660 {
1661 struct hlist_node *node;
1662 struct hlist_head *head;
1663 struct lec_arp_table *entry;
1664
1665 pr_debug("%pM\n", mac_addr);
1666
1667 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1668 hlist_for_each_entry(entry, node, head, next) {
1669 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1670 return entry;
1671 }
1672 return NULL;
1673 }
1674
1675 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1676 const unsigned char *mac_addr)
1677 {
1678 struct lec_arp_table *to_return;
1679
1680 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1681 if (!to_return) {
1682 pr_info("LEC: Arp entry kmalloc failed\n");
1683 return NULL;
1684 }
1685 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1686 INIT_HLIST_NODE(&to_return->next);
1687 setup_timer(&to_return->timer, lec_arp_expire_arp,
1688 (unsigned long)to_return);
1689 to_return->last_used = jiffies;
1690 to_return->priv = priv;
1691 skb_queue_head_init(&to_return->tx_wait);
1692 atomic_set(&to_return->usage, 1);
1693 return to_return;
1694 }
1695
1696 /* Arp sent timer expired */
1697 static void lec_arp_expire_arp(unsigned long data)
1698 {
1699 struct lec_arp_table *entry;
1700
1701 entry = (struct lec_arp_table *)data;
1702
1703 pr_debug("\n");
1704 if (entry->status == ESI_ARP_PENDING) {
1705 if (entry->no_tries <= entry->priv->max_retry_count) {
1706 if (entry->is_rdesc)
1707 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1708 entry->mac_addr, NULL, NULL);
1709 else
1710 send_to_lecd(entry->priv, l_arp_xmt,
1711 entry->mac_addr, NULL, NULL);
1712 entry->no_tries++;
1713 }
1714 mod_timer(&entry->timer, jiffies + (1 * HZ));
1715 }
1716 }
1717
1718 /* Unknown/unused vcc expire, remove associated entry */
1719 static void lec_arp_expire_vcc(unsigned long data)
1720 {
1721 unsigned long flags;
1722 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1723 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1724
1725 del_timer(&to_remove->timer);
1726
1727 pr_debug("%p %p: vpi:%d vci:%d\n",
1728 to_remove, priv,
1729 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1730 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1731
1732 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1733 hlist_del(&to_remove->next);
1734 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1735
1736 lec_arp_clear_vccs(to_remove);
1737 lec_arp_put(to_remove);
1738 }
1739
1740 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1741 unsigned long now,
1742 struct lec_priv *priv)
1743 {
1744 unsigned long time_to_check;
1745
1746 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1747 time_to_check = priv->forward_delay_time;
1748 else
1749 time_to_check = priv->aging_time;
1750
1751 pr_debug("About to expire: %lx - %lx > %lx\n",
1752 now, entry->last_used, time_to_check);
1753 if (time_after(now, entry->last_used + time_to_check) &&
1754 !(entry->flags & LEC_PERMANENT_FLAG) &&
1755 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1756 /* Remove entry */
1757 pr_debug("Entry timed out\n");
1758 lec_arp_remove(priv, entry);
1759 lec_arp_put(entry);
1760 } else {
1761 /* Something else */
1762 if ((entry->status == ESI_VC_PENDING ||
1763 entry->status == ESI_ARP_PENDING) &&
1764 time_after_eq(now, entry->timestamp +
1765 priv->max_unknown_frame_time)) {
1766 entry->timestamp = jiffies;
1767 entry->packets_flooded = 0;
1768 if (entry->status == ESI_VC_PENDING)
1769 send_to_lecd(priv, l_svc_setup,
1770 entry->mac_addr,
1771 entry->atm_addr,
1772 NULL);
1773 }
1774 if (entry->status == ESI_FLUSH_PENDING &&
1775 time_after_eq(now, entry->timestamp +
1776 priv->path_switching_delay)) {
1777 lec_arp_hold(entry);
1778 return true;
1779 }
1780 }
1781
1782 return false;
1783 }
1784 /*
1785 * Expire entries.
1786 * 1. Re-set timer
1787 * 2. For each entry, delete entries that have aged past the age limit.
1788 * 3. For each entry, depending on the status of the entry, perform
1789 * the following maintenance.
1790 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1791 * tick_count is above the max_unknown_frame_time, clear
1792 * the tick_count to zero and clear the packets_flooded counter
1793 * to zero. This supports the packet rate limit per address
1794 * while flooding unknowns.
1795 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1796 * than or equal to the path_switching_delay, change the status
1797 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1798 * regardless of the progress of the flush protocol.
1799 */
1800 static void lec_arp_check_expire(struct work_struct *work)
1801 {
1802 unsigned long flags;
1803 struct lec_priv *priv =
1804 container_of(work, struct lec_priv, lec_arp_work.work);
1805 struct hlist_node *node, *next;
1806 struct lec_arp_table *entry;
1807 unsigned long now;
1808 int i;
1809
1810 pr_debug("%p\n", priv);
1811 now = jiffies;
1812 restart:
1813 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1814 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1815 hlist_for_each_entry_safe(entry, node, next,
1816 &priv->lec_arp_tables[i], next) {
1817 if (__lec_arp_check_expire(entry, now, priv)) {
1818 struct sk_buff *skb;
1819 struct atm_vcc *vcc = entry->vcc;
1820
1821 spin_unlock_irqrestore(&priv->lec_arp_lock,
1822 flags);
1823 while ((skb = skb_dequeue(&entry->tx_wait)))
1824 lec_send(vcc, skb);
1825 entry->last_used = jiffies;
1826 entry->status = ESI_FORWARD_DIRECT;
1827 lec_arp_put(entry);
1828
1829 goto restart;
1830 }
1831 }
1832 }
1833 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1834
1835 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1836 }
1837
1838 /*
1839 * Try to find vcc where mac_address is attached.
1840 *
1841 */
1842 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1843 const unsigned char *mac_to_find,
1844 int is_rdesc,
1845 struct lec_arp_table **ret_entry)
1846 {
1847 unsigned long flags;
1848 struct lec_arp_table *entry;
1849 struct atm_vcc *found;
1850
1851 if (mac_to_find[0] & 0x01) {
1852 switch (priv->lane_version) {
1853 case 1:
1854 return priv->mcast_vcc;
1855 case 2: /* LANE2 wants arp for multicast addresses */
1856 if (!compare_ether_addr(mac_to_find, bus_mac))
1857 return priv->mcast_vcc;
1858 break;
1859 default:
1860 break;
1861 }
1862 }
1863
1864 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1865 entry = lec_arp_find(priv, mac_to_find);
1866
1867 if (entry) {
1868 if (entry->status == ESI_FORWARD_DIRECT) {
1869 /* Connection Ok */
1870 entry->last_used = jiffies;
1871 lec_arp_hold(entry);
1872 *ret_entry = entry;
1873 found = entry->vcc;
1874 goto out;
1875 }
1876 /*
1877 * If the LE_ARP cache entry is still pending, reset count to 0
1878 * so another LE_ARP request can be made for this frame.
1879 */
1880 if (entry->status == ESI_ARP_PENDING)
1881 entry->no_tries = 0;
1882 /*
1883 * Data direct VC not yet set up, check to see if the unknown
1884 * frame count is greater than the limit. If the limit has
1885 * not been reached, allow the caller to send packet to
1886 * BUS.
1887 */
1888 if (entry->status != ESI_FLUSH_PENDING &&
1889 entry->packets_flooded <
1890 priv->maximum_unknown_frame_count) {
1891 entry->packets_flooded++;
1892 pr_debug("Flooding..\n");
1893 found = priv->mcast_vcc;
1894 goto out;
1895 }
1896 /*
1897 * We got here because entry->status == ESI_FLUSH_PENDING
1898 * or BUS flood limit was reached for an entry which is
1899 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1900 */
1901 lec_arp_hold(entry);
1902 *ret_entry = entry;
1903 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1904 entry->vcc);
1905 found = NULL;
1906 } else {
1907 /* No matching entry was found */
1908 entry = make_entry(priv, mac_to_find);
1909 pr_debug("Making entry\n");
1910 if (!entry) {
1911 found = priv->mcast_vcc;
1912 goto out;
1913 }
1914 lec_arp_add(priv, entry);
1915 /* We want arp-request(s) to be sent */
1916 entry->packets_flooded = 1;
1917 entry->status = ESI_ARP_PENDING;
1918 entry->no_tries = 1;
1919 entry->last_used = entry->timestamp = jiffies;
1920 entry->is_rdesc = is_rdesc;
1921 if (entry->is_rdesc)
1922 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1923 NULL);
1924 else
1925 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1926 entry->timer.expires = jiffies + (1 * HZ);
1927 entry->timer.function = lec_arp_expire_arp;
1928 add_timer(&entry->timer);
1929 found = priv->mcast_vcc;
1930 }
1931
1932 out:
1933 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1934 return found;
1935 }
1936
1937 static int
1938 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1939 unsigned long permanent)
1940 {
1941 unsigned long flags;
1942 struct hlist_node *node, *next;
1943 struct lec_arp_table *entry;
1944 int i;
1945
1946 pr_debug("\n");
1947 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1948 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1949 hlist_for_each_entry_safe(entry, node, next,
1950 &priv->lec_arp_tables[i], next) {
1951 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1952 (permanent ||
1953 !(entry->flags & LEC_PERMANENT_FLAG))) {
1954 lec_arp_remove(priv, entry);
1955 lec_arp_put(entry);
1956 }
1957 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1958 return 0;
1959 }
1960 }
1961 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1962 return -1;
1963 }
1964
1965 /*
1966 * Notifies: Response to arp_request (atm_addr != NULL)
1967 */
1968 static void
1969 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1970 const unsigned char *atm_addr, unsigned long remoteflag,
1971 unsigned int targetless_le_arp)
1972 {
1973 unsigned long flags;
1974 struct hlist_node *node, *next;
1975 struct lec_arp_table *entry, *tmp;
1976 int i;
1977
1978 pr_debug("%smac:%pM\n",
1979 (targetless_le_arp) ? "targetless " : "", mac_addr);
1980
1981 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1982 entry = lec_arp_find(priv, mac_addr);
1983 if (entry == NULL && targetless_le_arp)
1984 goto out; /*
1985 * LANE2: ignore targetless LE_ARPs for which
1986 * we have no entry in the cache. 7.1.30
1987 */
1988 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1989 hlist_for_each_entry_safe(entry, node, next,
1990 &priv->lec_arp_empty_ones, next) {
1991 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1992 hlist_del(&entry->next);
1993 del_timer(&entry->timer);
1994 tmp = lec_arp_find(priv, mac_addr);
1995 if (tmp) {
1996 del_timer(&tmp->timer);
1997 tmp->status = ESI_FORWARD_DIRECT;
1998 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1999 tmp->vcc = entry->vcc;
2000 tmp->old_push = entry->old_push;
2001 tmp->last_used = jiffies;
2002 del_timer(&entry->timer);
2003 lec_arp_put(entry);
2004 entry = tmp;
2005 } else {
2006 entry->status = ESI_FORWARD_DIRECT;
2007 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2008 entry->last_used = jiffies;
2009 lec_arp_add(priv, entry);
2010 }
2011 if (remoteflag)
2012 entry->flags |= LEC_REMOTE_FLAG;
2013 else
2014 entry->flags &= ~LEC_REMOTE_FLAG;
2015 pr_debug("After update\n");
2016 dump_arp_table(priv);
2017 goto out;
2018 }
2019 }
2020 }
2021
2022 entry = lec_arp_find(priv, mac_addr);
2023 if (!entry) {
2024 entry = make_entry(priv, mac_addr);
2025 if (!entry)
2026 goto out;
2027 entry->status = ESI_UNKNOWN;
2028 lec_arp_add(priv, entry);
2029 /* Temporary, changes before end of function */
2030 }
2031 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2032 del_timer(&entry->timer);
2033 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2034 hlist_for_each_entry(tmp, node,
2035 &priv->lec_arp_tables[i], next) {
2036 if (entry != tmp &&
2037 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2038 /* Vcc to this host exists */
2039 if (tmp->status > ESI_VC_PENDING) {
2040 /*
2041 * ESI_FLUSH_PENDING,
2042 * ESI_FORWARD_DIRECT
2043 */
2044 entry->vcc = tmp->vcc;
2045 entry->old_push = tmp->old_push;
2046 }
2047 entry->status = tmp->status;
2048 break;
2049 }
2050 }
2051 }
2052 if (remoteflag)
2053 entry->flags |= LEC_REMOTE_FLAG;
2054 else
2055 entry->flags &= ~LEC_REMOTE_FLAG;
2056 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2057 entry->status = ESI_VC_PENDING;
2058 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2059 }
2060 pr_debug("After update2\n");
2061 dump_arp_table(priv);
2062 out:
2063 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2064 }
2065
2066 /*
2067 * Notifies: Vcc setup ready
2068 */
2069 static void
2070 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2071 struct atm_vcc *vcc,
2072 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2073 {
2074 unsigned long flags;
2075 struct hlist_node *node;
2076 struct lec_arp_table *entry;
2077 int i, found_entry = 0;
2078
2079 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2080 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2081 if (ioc_data->receive == 2) {
2082 pr_debug("LEC_ARP: Attaching mcast forward\n");
2083 #if 0
2084 entry = lec_arp_find(priv, bus_mac);
2085 if (!entry) {
2086 pr_info("LEC_ARP: Multicast entry not found!\n");
2087 goto out;
2088 }
2089 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2090 entry->recv_vcc = vcc;
2091 entry->old_recv_push = old_push;
2092 #endif
2093 entry = make_entry(priv, bus_mac);
2094 if (entry == NULL)
2095 goto out;
2096 del_timer(&entry->timer);
2097 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2098 entry->recv_vcc = vcc;
2099 entry->old_recv_push = old_push;
2100 hlist_add_head(&entry->next, &priv->mcast_fwds);
2101 goto out;
2102 } else if (ioc_data->receive == 1) {
2103 /*
2104 * Vcc which we don't want to make default vcc,
2105 * attach it anyway.
2106 */
2107 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",
2108 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2109 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2110 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2111 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2112 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2113 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2114 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2115 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2116 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2117 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2118 entry = make_entry(priv, bus_mac);
2119 if (entry == NULL)
2120 goto out;
2121 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2122 memset(entry->mac_addr, 0, ETH_ALEN);
2123 entry->recv_vcc = vcc;
2124 entry->old_recv_push = old_push;
2125 entry->status = ESI_UNKNOWN;
2126 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2127 entry->timer.function = lec_arp_expire_vcc;
2128 hlist_add_head(&entry->next, &priv->lec_no_forward);
2129 add_timer(&entry->timer);
2130 dump_arp_table(priv);
2131 goto out;
2132 }
2133 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",
2134 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2135 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2136 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2137 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2138 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2139 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2140 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2141 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2142 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2143 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2144 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2145 hlist_for_each_entry(entry, node,
2146 &priv->lec_arp_tables[i], next) {
2147 if (memcmp
2148 (ioc_data->atm_addr, entry->atm_addr,
2149 ATM_ESA_LEN) == 0) {
2150 pr_debug("LEC_ARP: Attaching data direct\n");
2151 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2152 entry->vcc ? entry->vcc->vci : 0,
2153 entry->recv_vcc ? entry->recv_vcc->
2154 vci : 0);
2155 found_entry = 1;
2156 del_timer(&entry->timer);
2157 entry->vcc = vcc;
2158 entry->old_push = old_push;
2159 if (entry->status == ESI_VC_PENDING) {
2160 if (priv->maximum_unknown_frame_count
2161 == 0)
2162 entry->status =
2163 ESI_FORWARD_DIRECT;
2164 else {
2165 entry->timestamp = jiffies;
2166 entry->status =
2167 ESI_FLUSH_PENDING;
2168 #if 0
2169 send_to_lecd(priv, l_flush_xmt,
2170 NULL,
2171 entry->atm_addr,
2172 NULL);
2173 #endif
2174 }
2175 } else {
2176 /*
2177 * They were forming a connection
2178 * to us, and we to them. Our
2179 * ATM address is numerically lower
2180 * than theirs, so we make connection
2181 * we formed into default VCC (8.1.11).
2182 * Connection they made gets torn
2183 * down. This might confuse some
2184 * clients. Can be changed if
2185 * someone reports trouble...
2186 */
2187 ;
2188 }
2189 }
2190 }
2191 }
2192 if (found_entry) {
2193 pr_debug("After vcc was added\n");
2194 dump_arp_table(priv);
2195 goto out;
2196 }
2197 /*
2198 * Not found, snatch address from first data packet that arrives
2199 * from this vcc
2200 */
2201 entry = make_entry(priv, bus_mac);
2202 if (!entry)
2203 goto out;
2204 entry->vcc = vcc;
2205 entry->old_push = old_push;
2206 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2207 memset(entry->mac_addr, 0, ETH_ALEN);
2208 entry->status = ESI_UNKNOWN;
2209 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2210 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2211 entry->timer.function = lec_arp_expire_vcc;
2212 add_timer(&entry->timer);
2213 pr_debug("After vcc was added\n");
2214 dump_arp_table(priv);
2215 out:
2216 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2217 }
2218
2219 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2220 {
2221 unsigned long flags;
2222 struct hlist_node *node;
2223 struct lec_arp_table *entry;
2224 int i;
2225
2226 pr_debug("%lx\n", tran_id);
2227 restart:
2228 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2229 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2230 hlist_for_each_entry(entry, node,
2231 &priv->lec_arp_tables[i], next) {
2232 if (entry->flush_tran_id == tran_id &&
2233 entry->status == ESI_FLUSH_PENDING) {
2234 struct sk_buff *skb;
2235 struct atm_vcc *vcc = entry->vcc;
2236
2237 lec_arp_hold(entry);
2238 spin_unlock_irqrestore(&priv->lec_arp_lock,
2239 flags);
2240 while ((skb = skb_dequeue(&entry->tx_wait)))
2241 lec_send(vcc, skb);
2242 entry->last_used = jiffies;
2243 entry->status = ESI_FORWARD_DIRECT;
2244 lec_arp_put(entry);
2245 pr_debug("LEC_ARP: Flushed\n");
2246 goto restart;
2247 }
2248 }
2249 }
2250 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2251 dump_arp_table(priv);
2252 }
2253
2254 static void
2255 lec_set_flush_tran_id(struct lec_priv *priv,
2256 const unsigned char *atm_addr, unsigned long tran_id)
2257 {
2258 unsigned long flags;
2259 struct hlist_node *node;
2260 struct lec_arp_table *entry;
2261 int i;
2262
2263 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2264 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2265 hlist_for_each_entry(entry, node,
2266 &priv->lec_arp_tables[i], next) {
2267 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2268 entry->flush_tran_id = tran_id;
2269 pr_debug("Set flush transaction id to %lx for %p\n",
2270 tran_id, entry);
2271 }
2272 }
2273 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2274 }
2275
2276 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2277 {
2278 unsigned long flags;
2279 unsigned char mac_addr[] = {
2280 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2281 };
2282 struct lec_arp_table *to_add;
2283 struct lec_vcc_priv *vpriv;
2284 int err = 0;
2285
2286 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2287 if (!vpriv)
2288 return -ENOMEM;
2289 vpriv->xoff = 0;
2290 vpriv->old_pop = vcc->pop;
2291 vcc->user_back = vpriv;
2292 vcc->pop = lec_pop;
2293 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2294 to_add = make_entry(priv, mac_addr);
2295 if (!to_add) {
2296 vcc->pop = vpriv->old_pop;
2297 kfree(vpriv);
2298 err = -ENOMEM;
2299 goto out;
2300 }
2301 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2302 to_add->status = ESI_FORWARD_DIRECT;
2303 to_add->flags |= LEC_PERMANENT_FLAG;
2304 to_add->vcc = vcc;
2305 to_add->old_push = vcc->push;
2306 vcc->push = lec_push;
2307 priv->mcast_vcc = vcc;
2308 lec_arp_add(priv, to_add);
2309 out:
2310 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2311 return err;
2312 }
2313
2314 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2315 {
2316 unsigned long flags;
2317 struct hlist_node *node, *next;
2318 struct lec_arp_table *entry;
2319 int i;
2320
2321 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2322 dump_arp_table(priv);
2323
2324 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2325
2326 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2327 hlist_for_each_entry_safe(entry, node, next,
2328 &priv->lec_arp_tables[i], next) {
2329 if (vcc == entry->vcc) {
2330 lec_arp_remove(priv, entry);
2331 lec_arp_put(entry);
2332 if (priv->mcast_vcc == vcc)
2333 priv->mcast_vcc = NULL;
2334 }
2335 }
2336 }
2337
2338 hlist_for_each_entry_safe(entry, node, next,
2339 &priv->lec_arp_empty_ones, next) {
2340 if (entry->vcc == vcc) {
2341 lec_arp_clear_vccs(entry);
2342 del_timer(&entry->timer);
2343 hlist_del(&entry->next);
2344 lec_arp_put(entry);
2345 }
2346 }
2347
2348 hlist_for_each_entry_safe(entry, node, next,
2349 &priv->lec_no_forward, next) {
2350 if (entry->recv_vcc == vcc) {
2351 lec_arp_clear_vccs(entry);
2352 del_timer(&entry->timer);
2353 hlist_del(&entry->next);
2354 lec_arp_put(entry);
2355 }
2356 }
2357
2358 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2359 if (entry->recv_vcc == vcc) {
2360 lec_arp_clear_vccs(entry);
2361 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2362 hlist_del(&entry->next);
2363 lec_arp_put(entry);
2364 }
2365 }
2366
2367 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2368 dump_arp_table(priv);
2369 }
2370
2371 static void
2372 lec_arp_check_empties(struct lec_priv *priv,
2373 struct atm_vcc *vcc, struct sk_buff *skb)
2374 {
2375 unsigned long flags;
2376 struct hlist_node *node, *next;
2377 struct lec_arp_table *entry, *tmp;
2378 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2379 unsigned char *src;
2380 #ifdef CONFIG_TR
2381 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2382
2383 if (priv->is_trdev)
2384 src = tr_hdr->h_source;
2385 else
2386 #endif
2387 src = hdr->h_source;
2388
2389 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2390 hlist_for_each_entry_safe(entry, node, next,
2391 &priv->lec_arp_empty_ones, next) {
2392 if (vcc == entry->vcc) {
2393 del_timer(&entry->timer);
2394 memcpy(entry->mac_addr, src, ETH_ALEN);
2395 entry->status = ESI_FORWARD_DIRECT;
2396 entry->last_used = jiffies;
2397 /* We might have got an entry */
2398 tmp = lec_arp_find(priv, src);
2399 if (tmp) {
2400 lec_arp_remove(priv, tmp);
2401 lec_arp_put(tmp);
2402 }
2403 hlist_del(&entry->next);
2404 lec_arp_add(priv, entry);
2405 goto out;
2406 }
2407 }
2408 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2409 out:
2410 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2411 }
2412
2413 MODULE_LICENSE("GPL");
CJK support for tty framebuffer vt