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m68knommu: define a local devm_clk_get() function
[linux-2.6.git] / net / atm / lec.c
bloba7d172105c99787ebf221584075d21090cb5d6ec
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 /* And atm device */
30 #include <linux/atmdev.h>
31 #include <linux/atmlec.h>
32
33 /* Proxy LEC knows about bridging */
34 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
35 #include "../bridge/br_private.h"
36
37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
38 #endif
39
40 /* Modular too */
41 #include <linux/module.h>
42 #include <linux/init.h>
43
44 #include "lec.h"
45 #include "lec_arpc.h"
46 #include "resources.h"
47
48 #define DUMP_PACKETS 0 /*
49 * 0 = None,
50 * 1 = 30 first bytes
51 * 2 = Whole packet
52 */
53
54 #define LEC_UNRES_QUE_LEN 8 /*
55 * number of tx packets to queue for a
56 * single destination while waiting for SVC
57 */
58
59 static int lec_open(struct net_device *dev);
60 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
61 struct net_device *dev);
62 static int lec_close(struct net_device *dev);
63 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
64 const unsigned char *mac_addr);
65 static int lec_arp_remove(struct lec_priv *priv,
66 struct lec_arp_table *to_remove);
67 /* LANE2 functions */
68 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
69 const u8 *tlvs, u32 sizeoftlvs);
70 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
71 u8 **tlvs, u32 *sizeoftlvs);
72 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
73 const u8 *tlvs, u32 sizeoftlvs);
74
75 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
76 unsigned long permanent);
77 static void lec_arp_check_empties(struct lec_priv *priv,
78 struct atm_vcc *vcc, struct sk_buff *skb);
79 static void lec_arp_destroy(struct lec_priv *priv);
80 static void lec_arp_init(struct lec_priv *priv);
81 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
82 const unsigned char *mac_to_find,
83 int is_rdesc,
84 struct lec_arp_table **ret_entry);
85 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
86 const unsigned char *atm_addr,
87 unsigned long remoteflag,
88 unsigned int targetless_le_arp);
89 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
90 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
91 static void lec_set_flush_tran_id(struct lec_priv *priv,
92 const unsigned char *atm_addr,
93 unsigned long tran_id);
94 static void lec_vcc_added(struct lec_priv *priv,
95 const struct atmlec_ioc *ioc_data,
96 struct atm_vcc *vcc,
97 void (*old_push)(struct atm_vcc *vcc,
98 struct sk_buff *skb));
99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
100
101 /* must be done under lec_arp_lock */
102 static inline void lec_arp_hold(struct lec_arp_table *entry)
103 {
104 atomic_inc(&entry->usage);
105 }
106
107 static inline void lec_arp_put(struct lec_arp_table *entry)
108 {
109 if (atomic_dec_and_test(&entry->usage))
110 kfree(entry);
111 }
112
113 static struct lane2_ops lane2_ops = {
114 lane2_resolve, /* resolve, spec 3.1.3 */
115 lane2_associate_req, /* associate_req, spec 3.1.4 */
116 NULL /* associate indicator, spec 3.1.5 */
117 };
118
119 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
120
121 /* Device structures */
122 static struct net_device *dev_lec[MAX_LEC_ITF];
123
124 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
125 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
126 {
127 char *buff;
128 struct lec_priv *priv;
129
130 /*
131 * Check if this is a BPDU. If so, ask zeppelin to send
132 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
133 * as the Config BPDU has
134 */
135 buff = skb->data + skb->dev->hard_header_len;
136 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
137 struct sock *sk;
138 struct sk_buff *skb2;
139 struct atmlec_msg *mesg;
140
141 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
142 if (skb2 == NULL)
143 return;
144 skb2->len = sizeof(struct atmlec_msg);
145 mesg = (struct atmlec_msg *)skb2->data;
146 mesg->type = l_topology_change;
147 buff += 4;
148 mesg->content.normal.flag = *buff & 0x01;
149 /* 0x01 is topology change */
150
151 priv = netdev_priv(dev);
152 atm_force_charge(priv->lecd, skb2->truesize);
153 sk = sk_atm(priv->lecd);
154 skb_queue_tail(&sk->sk_receive_queue, skb2);
155 sk->sk_data_ready(sk, skb2->len);
156 }
157 }
158 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
159
160 /*
161 * Open/initialize the netdevice. This is called (in the current kernel)
162 * sometime after booting when the 'ifconfig' program is run.
163 *
164 * This routine should set everything up anew at each open, even
165 * registers that "should" only need to be set once at boot, so that
166 * there is non-reboot way to recover if something goes wrong.
167 */
168
169 static int lec_open(struct net_device *dev)
170 {
171 netif_start_queue(dev);
172
173 return 0;
174 }
175
176 static void
177 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
178 {
179 struct net_device *dev = skb->dev;
180
181 ATM_SKB(skb)->vcc = vcc;
182 ATM_SKB(skb)->atm_options = vcc->atm_options;
183
184 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
185 if (vcc->send(vcc, skb) < 0) {
186 dev->stats.tx_dropped++;
187 return;
188 }
189
190 dev->stats.tx_packets++;
191 dev->stats.tx_bytes += skb->len;
192 }
193
194 static void lec_tx_timeout(struct net_device *dev)
195 {
196 pr_info("%s\n", dev->name);
197 dev->trans_start = jiffies;
198 netif_wake_queue(dev);
199 }
200
201 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
202 struct net_device *dev)
203 {
204 struct sk_buff *skb2;
205 struct lec_priv *priv = netdev_priv(dev);
206 struct lecdatahdr_8023 *lec_h;
207 struct atm_vcc *vcc;
208 struct lec_arp_table *entry;
209 unsigned char *dst;
210 int min_frame_size;
211 int is_rdesc;
212
213 pr_debug("called\n");
214 if (!priv->lecd) {
215 pr_info("%s:No lecd attached\n", dev->name);
216 dev->stats.tx_errors++;
217 netif_stop_queue(dev);
218 kfree_skb(skb);
219 return NETDEV_TX_OK;
220 }
221
222 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
223 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
224 (long)skb_end_pointer(skb));
225 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
226 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
227 lec_handle_bridge(skb, dev);
228 #endif
229
230 /* Make sure we have room for lec_id */
231 if (skb_headroom(skb) < 2) {
232 pr_debug("reallocating skb\n");
233 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
234 kfree_skb(skb);
235 if (skb2 == NULL)
236 return NETDEV_TX_OK;
237 skb = skb2;
238 }
239 skb_push(skb, 2);
240
241 /* Put le header to place */
242 lec_h = (struct lecdatahdr_8023 *)skb->data;
243 lec_h->le_header = htons(priv->lecid);
244
245 #if DUMP_PACKETS >= 2
246 #define MAX_DUMP_SKB 99
247 #elif DUMP_PACKETS >= 1
248 #define MAX_DUMP_SKB 30
249 #endif
250 #if DUMP_PACKETS >= 1
251 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
252 dev->name, skb->len, priv->lecid);
253 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
254 skb->data, min(skb->len, MAX_DUMP_SKB), true);
255 #endif /* DUMP_PACKETS >= 1 */
256
257 /* Minimum ethernet-frame size */
258 min_frame_size = LEC_MINIMUM_8023_SIZE;
259 if (skb->len < min_frame_size) {
260 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
261 skb2 = skb_copy_expand(skb, 0,
262 min_frame_size - skb->truesize,
263 GFP_ATOMIC);
264 dev_kfree_skb(skb);
265 if (skb2 == NULL) {
266 dev->stats.tx_dropped++;
267 return NETDEV_TX_OK;
268 }
269 skb = skb2;
270 }
271 skb_put(skb, min_frame_size - skb->len);
272 }
273
274 /* Send to right vcc */
275 is_rdesc = 0;
276 dst = lec_h->h_dest;
277 entry = NULL;
278 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
279 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
280 dev->name, vcc, vcc ? vcc->flags : 0, entry);
281 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
282 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
283 pr_debug("%s:queuing packet, MAC address %pM\n",
284 dev->name, lec_h->h_dest);
285 skb_queue_tail(&entry->tx_wait, skb);
286 } else {
287 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
288 dev->name, lec_h->h_dest);
289 dev->stats.tx_dropped++;
290 dev_kfree_skb(skb);
291 }
292 goto out;
293 }
294 #if DUMP_PACKETS > 0
295 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
296 dev->name, vcc->vpi, vcc->vci);
297 #endif /* DUMP_PACKETS > 0 */
298
299 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
300 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
301 lec_send(vcc, skb2);
302 }
303
304 lec_send(vcc, skb);
305
306 if (!atm_may_send(vcc, 0)) {
307 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
308
309 vpriv->xoff = 1;
310 netif_stop_queue(dev);
311
312 /*
313 * vcc->pop() might have occurred in between, making
314 * the vcc usuable again. Since xmit is serialized,
315 * this is the only situation we have to re-test.
316 */
317
318 if (atm_may_send(vcc, 0))
319 netif_wake_queue(dev);
320 }
321
322 out:
323 if (entry)
324 lec_arp_put(entry);
325 dev->trans_start = jiffies;
326 return NETDEV_TX_OK;
327 }
328
329 /* The inverse routine to net_open(). */
330 static int lec_close(struct net_device *dev)
331 {
332 netif_stop_queue(dev);
333 return 0;
334 }
335
336 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
337 {
338 unsigned long flags;
339 struct net_device *dev = (struct net_device *)vcc->proto_data;
340 struct lec_priv *priv = netdev_priv(dev);
341 struct atmlec_msg *mesg;
342 struct lec_arp_table *entry;
343 int i;
344 char *tmp; /* FIXME */
345
346 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
347 mesg = (struct atmlec_msg *)skb->data;
348 tmp = skb->data;
349 tmp += sizeof(struct atmlec_msg);
350 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
351 switch (mesg->type) {
352 case l_set_mac_addr:
353 for (i = 0; i < 6; i++)
354 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
355 break;
356 case l_del_mac_addr:
357 for (i = 0; i < 6; i++)
358 dev->dev_addr[i] = 0;
359 break;
360 case l_addr_delete:
361 lec_addr_delete(priv, mesg->content.normal.atm_addr,
362 mesg->content.normal.flag);
363 break;
364 case l_topology_change:
365 priv->topology_change = mesg->content.normal.flag;
366 break;
367 case l_flush_complete:
368 lec_flush_complete(priv, mesg->content.normal.flag);
369 break;
370 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
371 spin_lock_irqsave(&priv->lec_arp_lock, flags);
372 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
373 lec_arp_remove(priv, entry);
374 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
375
376 if (mesg->content.normal.no_source_le_narp)
377 break;
378 /* FALL THROUGH */
379 case l_arp_update:
380 lec_arp_update(priv, mesg->content.normal.mac_addr,
381 mesg->content.normal.atm_addr,
382 mesg->content.normal.flag,
383 mesg->content.normal.targetless_le_arp);
384 pr_debug("in l_arp_update\n");
385 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
386 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
387 mesg->sizeoftlvs);
388 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
389 tmp, mesg->sizeoftlvs);
390 }
391 break;
392 case l_config:
393 priv->maximum_unknown_frame_count =
394 mesg->content.config.maximum_unknown_frame_count;
395 priv->max_unknown_frame_time =
396 (mesg->content.config.max_unknown_frame_time * HZ);
397 priv->max_retry_count = mesg->content.config.max_retry_count;
398 priv->aging_time = (mesg->content.config.aging_time * HZ);
399 priv->forward_delay_time =
400 (mesg->content.config.forward_delay_time * HZ);
401 priv->arp_response_time =
402 (mesg->content.config.arp_response_time * HZ);
403 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
404 priv->path_switching_delay =
405 (mesg->content.config.path_switching_delay * HZ);
406 priv->lane_version = mesg->content.config.lane_version;
407 /* LANE2 */
408 priv->lane2_ops = NULL;
409 if (priv->lane_version > 1)
410 priv->lane2_ops = &lane2_ops;
411 if (dev_set_mtu(dev, mesg->content.config.mtu))
412 pr_info("%s: change_mtu to %d failed\n",
413 dev->name, mesg->content.config.mtu);
414 priv->is_proxy = mesg->content.config.is_proxy;
415 break;
416 case l_flush_tran_id:
417 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
418 mesg->content.normal.flag);
419 break;
420 case l_set_lecid:
421 priv->lecid =
422 (unsigned short)(0xffff & mesg->content.normal.flag);
423 break;
424 case l_should_bridge:
425 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
426 {
427 pr_debug("%s: bridge zeppelin asks about %pM\n",
428 dev->name, mesg->content.proxy.mac_addr);
429
430 if (br_fdb_test_addr_hook == NULL)
431 break;
432
433 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
434 /* hit from bridge table, send LE_ARP_RESPONSE */
435 struct sk_buff *skb2;
436 struct sock *sk;
437
438 pr_debug("%s: entry found, responding to zeppelin\n",
439 dev->name);
440 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
441 if (skb2 == NULL)
442 break;
443 skb2->len = sizeof(struct atmlec_msg);
444 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
445 atm_force_charge(priv->lecd, skb2->truesize);
446 sk = sk_atm(priv->lecd);
447 skb_queue_tail(&sk->sk_receive_queue, skb2);
448 sk->sk_data_ready(sk, skb2->len);
449 }
450 }
451 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
452 break;
453 default:
454 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
455 dev_kfree_skb(skb);
456 return -EINVAL;
457 }
458 dev_kfree_skb(skb);
459 return 0;
460 }
461
462 static void lec_atm_close(struct atm_vcc *vcc)
463 {
464 struct sk_buff *skb;
465 struct net_device *dev = (struct net_device *)vcc->proto_data;
466 struct lec_priv *priv = netdev_priv(dev);
467
468 priv->lecd = NULL;
469 /* Do something needful? */
470
471 netif_stop_queue(dev);
472 lec_arp_destroy(priv);
473
474 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
475 pr_info("%s closing with messages pending\n", dev->name);
476 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
477 atm_return(vcc, skb->truesize);
478 dev_kfree_skb(skb);
479 }
480
481 pr_info("%s: Shut down!\n", dev->name);
482 module_put(THIS_MODULE);
483 }
484
485 static struct atmdev_ops lecdev_ops = {
486 .close = lec_atm_close,
487 .send = lec_atm_send
488 };
489
490 static struct atm_dev lecatm_dev = {
491 .ops = &lecdev_ops,
492 .type = "lec",
493 .number = 999, /* dummy device number */
494 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
495 };
496
497 /*
498 * LANE2: new argument struct sk_buff *data contains
499 * the LE_ARP based TLVs introduced in the LANE2 spec
500 */
501 static int
502 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
503 const unsigned char *mac_addr, const unsigned char *atm_addr,
504 struct sk_buff *data)
505 {
506 struct sock *sk;
507 struct sk_buff *skb;
508 struct atmlec_msg *mesg;
509
510 if (!priv || !priv->lecd)
511 return -1;
512 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
513 if (!skb)
514 return -1;
515 skb->len = sizeof(struct atmlec_msg);
516 mesg = (struct atmlec_msg *)skb->data;
517 memset(mesg, 0, sizeof(struct atmlec_msg));
518 mesg->type = type;
519 if (data != NULL)
520 mesg->sizeoftlvs = data->len;
521 if (mac_addr)
522 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
523 else
524 mesg->content.normal.targetless_le_arp = 1;
525 if (atm_addr)
526 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
527
528 atm_force_charge(priv->lecd, skb->truesize);
529 sk = sk_atm(priv->lecd);
530 skb_queue_tail(&sk->sk_receive_queue, skb);
531 sk->sk_data_ready(sk, skb->len);
532
533 if (data != NULL) {
534 pr_debug("about to send %d bytes of data\n", data->len);
535 atm_force_charge(priv->lecd, data->truesize);
536 skb_queue_tail(&sk->sk_receive_queue, data);
537 sk->sk_data_ready(sk, skb->len);
538 }
539
540 return 0;
541 }
542
543 /* shamelessly stolen from drivers/net/net_init.c */
544 static int lec_change_mtu(struct net_device *dev, int new_mtu)
545 {
546 if ((new_mtu < 68) || (new_mtu > 18190))
547 return -EINVAL;
548 dev->mtu = new_mtu;
549 return 0;
550 }
551
552 static void lec_set_multicast_list(struct net_device *dev)
553 {
554 /*
555 * by default, all multicast frames arrive over the bus.
556 * eventually support selective multicast service
557 */
558 }
559
560 static const struct net_device_ops lec_netdev_ops = {
561 .ndo_open = lec_open,
562 .ndo_stop = lec_close,
563 .ndo_start_xmit = lec_start_xmit,
564 .ndo_change_mtu = lec_change_mtu,
565 .ndo_tx_timeout = lec_tx_timeout,
566 .ndo_set_rx_mode = lec_set_multicast_list,
567 };
568
569 static const unsigned char lec_ctrl_magic[] = {
570 0xff,
571 0x00,
572 0x01,
573 0x01
574 };
575
576 #define LEC_DATA_DIRECT_8023 2
577 #define LEC_DATA_DIRECT_8025 3
578
579 static int lec_is_data_direct(struct atm_vcc *vcc)
580 {
581 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
582 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
583 }
584
585 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
586 {
587 unsigned long flags;
588 struct net_device *dev = (struct net_device *)vcc->proto_data;
589 struct lec_priv *priv = netdev_priv(dev);
590
591 #if DUMP_PACKETS > 0
592 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
593 dev->name, vcc->vpi, vcc->vci);
594 #endif
595 if (!skb) {
596 pr_debug("%s: null skb\n", dev->name);
597 lec_vcc_close(priv, vcc);
598 return;
599 }
600 #if DUMP_PACKETS >= 2
601 #define MAX_SKB_DUMP 99
602 #elif DUMP_PACKETS >= 1
603 #define MAX_SKB_DUMP 30
604 #endif
605 #if DUMP_PACKETS > 0
606 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
607 dev->name, skb->len, priv->lecid);
608 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
609 skb->data, min(MAX_SKB_DUMP, skb->len), true);
610 #endif /* DUMP_PACKETS > 0 */
611 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
612 /* Control frame, to daemon */
613 struct sock *sk = sk_atm(vcc);
614
615 pr_debug("%s: To daemon\n", dev->name);
616 skb_queue_tail(&sk->sk_receive_queue, skb);
617 sk->sk_data_ready(sk, skb->len);
618 } else { /* Data frame, queue to protocol handlers */
619 struct lec_arp_table *entry;
620 unsigned char *src, *dst;
621
622 atm_return(vcc, skb->truesize);
623 if (*(__be16 *) skb->data == htons(priv->lecid) ||
624 !priv->lecd || !(dev->flags & IFF_UP)) {
625 /*
626 * Probably looping back, or if lecd is missing,
627 * lecd has gone down
628 */
629 pr_debug("Ignoring frame...\n");
630 dev_kfree_skb(skb);
631 return;
632 }
633 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
634
635 /*
636 * If this is a Data Direct VCC, and the VCC does not match
637 * the LE_ARP cache entry, delete the LE_ARP cache entry.
638 */
639 spin_lock_irqsave(&priv->lec_arp_lock, flags);
640 if (lec_is_data_direct(vcc)) {
641 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
642 entry = lec_arp_find(priv, src);
643 if (entry && entry->vcc != vcc) {
644 lec_arp_remove(priv, entry);
645 lec_arp_put(entry);
646 }
647 }
648 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
649
650 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
651 !priv->is_proxy && /* Proxy wants all the packets */
652 memcmp(dst, dev->dev_addr, dev->addr_len)) {
653 dev_kfree_skb(skb);
654 return;
655 }
656 if (!hlist_empty(&priv->lec_arp_empty_ones))
657 lec_arp_check_empties(priv, vcc, skb);
658 skb_pull(skb, 2); /* skip lec_id */
659 skb->protocol = eth_type_trans(skb, dev);
660 dev->stats.rx_packets++;
661 dev->stats.rx_bytes += skb->len;
662 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
663 netif_rx(skb);
664 }
665 }
666
667 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
668 {
669 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
670 struct net_device *dev = skb->dev;
671
672 if (vpriv == NULL) {
673 pr_info("vpriv = NULL!?!?!?\n");
674 return;
675 }
676
677 vpriv->old_pop(vcc, skb);
678
679 if (vpriv->xoff && atm_may_send(vcc, 0)) {
680 vpriv->xoff = 0;
681 if (netif_running(dev) && netif_queue_stopped(dev))
682 netif_wake_queue(dev);
683 }
684 }
685
686 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
687 {
688 struct lec_vcc_priv *vpriv;
689 int bytes_left;
690 struct atmlec_ioc ioc_data;
691
692 /* Lecd must be up in this case */
693 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
694 if (bytes_left != 0)
695 pr_info("copy from user failed for %d bytes\n", bytes_left);
696 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
697 !dev_lec[ioc_data.dev_num])
698 return -EINVAL;
699 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
700 if (!vpriv)
701 return -ENOMEM;
702 vpriv->xoff = 0;
703 vpriv->old_pop = vcc->pop;
704 vcc->user_back = vpriv;
705 vcc->pop = lec_pop;
706 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
707 &ioc_data, vcc, vcc->push);
708 vcc->proto_data = dev_lec[ioc_data.dev_num];
709 vcc->push = lec_push;
710 return 0;
711 }
712
713 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
714 {
715 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
716 return -EINVAL;
717 vcc->proto_data = dev_lec[arg];
718 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
719 }
720
721 /* Initialize device. */
722 static int lecd_attach(struct atm_vcc *vcc, int arg)
723 {
724 int i;
725 struct lec_priv *priv;
726
727 if (arg < 0)
728 i = 0;
729 else
730 i = arg;
731 if (arg >= MAX_LEC_ITF)
732 return -EINVAL;
733 if (!dev_lec[i]) {
734 int size;
735
736 size = sizeof(struct lec_priv);
737 dev_lec[i] = alloc_etherdev(size);
738 if (!dev_lec[i])
739 return -ENOMEM;
740 dev_lec[i]->netdev_ops = &lec_netdev_ops;
741 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
742 if (register_netdev(dev_lec[i])) {
743 free_netdev(dev_lec[i]);
744 return -EINVAL;
745 }
746
747 priv = netdev_priv(dev_lec[i]);
748 } else {
749 priv = netdev_priv(dev_lec[i]);
750 if (priv->lecd)
751 return -EADDRINUSE;
752 }
753 lec_arp_init(priv);
754 priv->itfnum = i; /* LANE2 addition */
755 priv->lecd = vcc;
756 vcc->dev = &lecatm_dev;
757 vcc_insert_socket(sk_atm(vcc));
758
759 vcc->proto_data = dev_lec[i];
760 set_bit(ATM_VF_META, &vcc->flags);
761 set_bit(ATM_VF_READY, &vcc->flags);
762
763 /* Set default values to these variables */
764 priv->maximum_unknown_frame_count = 1;
765 priv->max_unknown_frame_time = (1 * HZ);
766 priv->vcc_timeout_period = (1200 * HZ);
767 priv->max_retry_count = 1;
768 priv->aging_time = (300 * HZ);
769 priv->forward_delay_time = (15 * HZ);
770 priv->topology_change = 0;
771 priv->arp_response_time = (1 * HZ);
772 priv->flush_timeout = (4 * HZ);
773 priv->path_switching_delay = (6 * HZ);
774
775 if (dev_lec[i]->flags & IFF_UP)
776 netif_start_queue(dev_lec[i]);
777 __module_get(THIS_MODULE);
778 return i;
779 }
780
781 #ifdef CONFIG_PROC_FS
782 static const char *lec_arp_get_status_string(unsigned char status)
783 {
784 static const char *const lec_arp_status_string[] = {
785 "ESI_UNKNOWN ",
786 "ESI_ARP_PENDING ",
787 "ESI_VC_PENDING ",
788 "<Undefined> ",
789 "ESI_FLUSH_PENDING ",
790 "ESI_FORWARD_DIRECT"
791 };
792
793 if (status > ESI_FORWARD_DIRECT)
794 status = 3; /* ESI_UNDEFINED */
795 return lec_arp_status_string[status];
796 }
797
798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
799 {
800 int i;
801
802 for (i = 0; i < ETH_ALEN; i++)
803 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
804 seq_printf(seq, " ");
805 for (i = 0; i < ATM_ESA_LEN; i++)
806 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
807 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
808 entry->flags & 0xffff);
809 if (entry->vcc)
810 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
811 else
812 seq_printf(seq, " ");
813 if (entry->recv_vcc) {
814 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
815 entry->recv_vcc->vci);
816 }
817 seq_putc(seq, '\n');
818 }
819
820 struct lec_state {
821 unsigned long flags;
822 struct lec_priv *locked;
823 struct hlist_node *node;
824 struct net_device *dev;
825 int itf;
826 int arp_table;
827 int misc_table;
828 };
829
830 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
831 loff_t *l)
832 {
833 struct hlist_node *e = state->node;
834 struct lec_arp_table *tmp;
835
836 if (!e)
837 e = tbl->first;
838 if (e == SEQ_START_TOKEN) {
839 e = tbl->first;
840 --*l;
841 }
842
843 hlist_for_each_entry_from(tmp, e, next) {
844 if (--*l < 0)
845 break;
846 }
847 state->node = e;
848
849 return (*l < 0) ? state : NULL;
850 }
851
852 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
853 struct lec_priv *priv)
854 {
855 void *v = NULL;
856 int p;
857
858 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
859 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
860 if (v)
861 break;
862 }
863 state->arp_table = p;
864 return v;
865 }
866
867 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
868 struct lec_priv *priv)
869 {
870 struct hlist_head *lec_misc_tables[] = {
871 &priv->lec_arp_empty_ones,
872 &priv->lec_no_forward,
873 &priv->mcast_fwds
874 };
875 void *v = NULL;
876 int q;
877
878 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
879 v = lec_tbl_walk(state, lec_misc_tables[q], l);
880 if (v)
881 break;
882 }
883 state->misc_table = q;
884 return v;
885 }
886
887 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
888 struct lec_priv *priv)
889 {
890 if (!state->locked) {
891 state->locked = priv;
892 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
893 }
894 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
895 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
896 state->locked = NULL;
897 /* Partial state reset for the next time we get called */
898 state->arp_table = state->misc_table = 0;
899 }
900 return state->locked;
901 }
902
903 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
904 {
905 struct net_device *dev;
906 void *v;
907
908 dev = state->dev ? state->dev : dev_lec[state->itf];
909 v = (dev && netdev_priv(dev)) ?
910 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
911 if (!v && dev) {
912 dev_put(dev);
913 /* Partial state reset for the next time we get called */
914 dev = NULL;
915 }
916 state->dev = dev;
917 return v;
918 }
919
920 static void *lec_get_idx(struct lec_state *state, loff_t l)
921 {
922 void *v = NULL;
923
924 for (; state->itf < MAX_LEC_ITF; state->itf++) {
925 v = lec_itf_walk(state, &l);
926 if (v)
927 break;
928 }
929 return v;
930 }
931
932 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
933 {
934 struct lec_state *state = seq->private;
935
936 state->itf = 0;
937 state->dev = NULL;
938 state->locked = NULL;
939 state->arp_table = 0;
940 state->misc_table = 0;
941 state->node = SEQ_START_TOKEN;
942
943 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
944 }
945
946 static void lec_seq_stop(struct seq_file *seq, void *v)
947 {
948 struct lec_state *state = seq->private;
949
950 if (state->dev) {
951 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
952 state->flags);
953 dev_put(state->dev);
954 }
955 }
956
957 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
958 {
959 struct lec_state *state = seq->private;
960
961 v = lec_get_idx(state, 1);
962 *pos += !!PTR_ERR(v);
963 return v;
964 }
965
966 static int lec_seq_show(struct seq_file *seq, void *v)
967 {
968 static const char lec_banner[] =
969 "Itf MAC ATM destination"
970 " Status Flags "
971 "VPI/VCI Recv VPI/VCI\n";
972
973 if (v == SEQ_START_TOKEN)
974 seq_puts(seq, lec_banner);
975 else {
976 struct lec_state *state = seq->private;
977 struct net_device *dev = state->dev;
978 struct lec_arp_table *entry = hlist_entry(state->node,
979 struct lec_arp_table,
980 next);
981
982 seq_printf(seq, "%s ", dev->name);
983 lec_info(seq, entry);
984 }
985 return 0;
986 }
987
988 static const struct seq_operations lec_seq_ops = {
989 .start = lec_seq_start,
990 .next = lec_seq_next,
991 .stop = lec_seq_stop,
992 .show = lec_seq_show,
993 };
994
995 static int lec_seq_open(struct inode *inode, struct file *file)
996 {
997 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
998 }
999
1000 static const struct file_operations lec_seq_fops = {
1001 .owner = THIS_MODULE,
1002 .open = lec_seq_open,
1003 .read = seq_read,
1004 .llseek = seq_lseek,
1005 .release = seq_release_private,
1006 };
1007 #endif
1008
1009 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1010 {
1011 struct atm_vcc *vcc = ATM_SD(sock);
1012 int err = 0;
1013
1014 switch (cmd) {
1015 case ATMLEC_CTRL:
1016 case ATMLEC_MCAST:
1017 case ATMLEC_DATA:
1018 if (!capable(CAP_NET_ADMIN))
1019 return -EPERM;
1020 break;
1021 default:
1022 return -ENOIOCTLCMD;
1023 }
1024
1025 switch (cmd) {
1026 case ATMLEC_CTRL:
1027 err = lecd_attach(vcc, (int)arg);
1028 if (err >= 0)
1029 sock->state = SS_CONNECTED;
1030 break;
1031 case ATMLEC_MCAST:
1032 err = lec_mcast_attach(vcc, (int)arg);
1033 break;
1034 case ATMLEC_DATA:
1035 err = lec_vcc_attach(vcc, (void __user *)arg);
1036 break;
1037 }
1038
1039 return err;
1040 }
1041
1042 static struct atm_ioctl lane_ioctl_ops = {
1043 .owner = THIS_MODULE,
1044 .ioctl = lane_ioctl,
1045 };
1046
1047 static int __init lane_module_init(void)
1048 {
1049 #ifdef CONFIG_PROC_FS
1050 struct proc_dir_entry *p;
1051
1052 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1053 if (!p) {
1054 pr_err("Unable to initialize /proc/net/atm/lec\n");
1055 return -ENOMEM;
1056 }
1057 #endif
1058
1059 register_atm_ioctl(&lane_ioctl_ops);
1060 pr_info("lec.c: initialized\n");
1061 return 0;
1062 }
1063
1064 static void __exit lane_module_cleanup(void)
1065 {
1066 int i;
1067
1068 remove_proc_entry("lec", atm_proc_root);
1069
1070 deregister_atm_ioctl(&lane_ioctl_ops);
1071
1072 for (i = 0; i < MAX_LEC_ITF; i++) {
1073 if (dev_lec[i] != NULL) {
1074 unregister_netdev(dev_lec[i]);
1075 free_netdev(dev_lec[i]);
1076 dev_lec[i] = NULL;
1077 }
1078 }
1079 }
1080
1081 module_init(lane_module_init);
1082 module_exit(lane_module_cleanup);
1083
1084 /*
1085 * LANE2: 3.1.3, LE_RESOLVE.request
1086 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1087 * If sizeoftlvs == NULL the default TLVs associated with with this
1088 * lec will be used.
1089 * If dst_mac == NULL, targetless LE_ARP will be sent
1090 */
1091 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1092 u8 **tlvs, u32 *sizeoftlvs)
1093 {
1094 unsigned long flags;
1095 struct lec_priv *priv = netdev_priv(dev);
1096 struct lec_arp_table *table;
1097 struct sk_buff *skb;
1098 int retval;
1099
1100 if (force == 0) {
1101 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1102 table = lec_arp_find(priv, dst_mac);
1103 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1104 if (table == NULL)
1105 return -1;
1106
1107 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1108 if (*tlvs == NULL)
1109 return -1;
1110
1111 *sizeoftlvs = table->sizeoftlvs;
1112
1113 return 0;
1114 }
1115
1116 if (sizeoftlvs == NULL)
1117 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1118
1119 else {
1120 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1121 if (skb == NULL)
1122 return -1;
1123 skb->len = *sizeoftlvs;
1124 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1125 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1126 }
1127 return retval;
1128 }
1129
1130 /*
1131 * LANE2: 3.1.4, LE_ASSOCIATE.request
1132 * Associate the *tlvs with the *lan_dst address.
1133 * Will overwrite any previous association
1134 * Returns 1 for success, 0 for failure (out of memory)
1135 *
1136 */
1137 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1138 const u8 *tlvs, u32 sizeoftlvs)
1139 {
1140 int retval;
1141 struct sk_buff *skb;
1142 struct lec_priv *priv = netdev_priv(dev);
1143
1144 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1145 return 0; /* not our mac address */
1146
1147 kfree(priv->tlvs); /* NULL if there was no previous association */
1148
1149 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1150 if (priv->tlvs == NULL)
1151 return 0;
1152 priv->sizeoftlvs = sizeoftlvs;
1153
1154 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1155 if (skb == NULL)
1156 return 0;
1157 skb->len = sizeoftlvs;
1158 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1159 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1160 if (retval != 0)
1161 pr_info("lec.c: lane2_associate_req() failed\n");
1162 /*
1163 * If the previous association has changed we must
1164 * somehow notify other LANE entities about the change
1165 */
1166 return 1;
1167 }
1168
1169 /*
1170 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1171 *
1172 */
1173 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1174 const u8 *tlvs, u32 sizeoftlvs)
1175 {
1176 #if 0
1177 int i = 0;
1178 #endif
1179 struct lec_priv *priv = netdev_priv(dev);
1180 #if 0 /*
1181 * Why have the TLVs in LE_ARP entries
1182 * since we do not use them? When you
1183 * uncomment this code, make sure the
1184 * TLVs get freed when entry is killed
1185 */
1186 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1187
1188 if (entry == NULL)
1189 return; /* should not happen */
1190
1191 kfree(entry->tlvs);
1192
1193 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1194 if (entry->tlvs == NULL)
1195 return;
1196 entry->sizeoftlvs = sizeoftlvs;
1197 #endif
1198 #if 0
1199 pr_info("\n");
1200 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1201 while (i < sizeoftlvs)
1202 pr_cont("%02x ", tlvs[i++]);
1203
1204 pr_cont("\n");
1205 #endif
1206
1207 /* tell MPOA about the TLVs we saw */
1208 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1209 priv->lane2_ops->associate_indicator(dev, mac_addr,
1210 tlvs, sizeoftlvs);
1211 }
1212 }
1213
1214 /*
1215 * Here starts what used to lec_arpc.c
1216 *
1217 * lec_arpc.c was added here when making
1218 * lane client modular. October 1997
1219 */
1220
1221 #include <linux/types.h>
1222 #include <linux/timer.h>
1223 #include <linux/param.h>
1224 #include <linux/atomic.h>
1225 #include <linux/inetdevice.h>
1226 #include <net/route.h>
1227
1228 #if 0
1229 #define pr_debug(format, args...)
1230 /*
1231 #define pr_debug printk
1232 */
1233 #endif
1234 #define DEBUG_ARP_TABLE 0
1235
1236 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1237
1238 static void lec_arp_check_expire(struct work_struct *work);
1239 static void lec_arp_expire_arp(unsigned long data);
1240
1241 /*
1242 * Arp table funcs
1243 */
1244
1245 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1246
1247 /*
1248 * Initialization of arp-cache
1249 */
1250 static void lec_arp_init(struct lec_priv *priv)
1251 {
1252 unsigned short i;
1253
1254 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1255 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1256 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1257 INIT_HLIST_HEAD(&priv->lec_no_forward);
1258 INIT_HLIST_HEAD(&priv->mcast_fwds);
1259 spin_lock_init(&priv->lec_arp_lock);
1260 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1261 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1262 }
1263
1264 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1265 {
1266 if (entry->vcc) {
1267 struct atm_vcc *vcc = entry->vcc;
1268 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1269 struct net_device *dev = (struct net_device *)vcc->proto_data;
1270
1271 vcc->pop = vpriv->old_pop;
1272 if (vpriv->xoff)
1273 netif_wake_queue(dev);
1274 kfree(vpriv);
1275 vcc->user_back = NULL;
1276 vcc->push = entry->old_push;
1277 vcc_release_async(vcc, -EPIPE);
1278 entry->vcc = NULL;
1279 }
1280 if (entry->recv_vcc) {
1281 entry->recv_vcc->push = entry->old_recv_push;
1282 vcc_release_async(entry->recv_vcc, -EPIPE);
1283 entry->recv_vcc = NULL;
1284 }
1285 }
1286
1287 /*
1288 * Insert entry to lec_arp_table
1289 * LANE2: Add to the end of the list to satisfy 8.1.13
1290 */
1291 static inline void
1292 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1293 {
1294 struct hlist_head *tmp;
1295
1296 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1297 hlist_add_head(&entry->next, tmp);
1298
1299 pr_debug("Added entry:%pM\n", entry->mac_addr);
1300 }
1301
1302 /*
1303 * Remove entry from lec_arp_table
1304 */
1305 static int
1306 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1307 {
1308 struct hlist_node *node;
1309 struct lec_arp_table *entry;
1310 int i, remove_vcc = 1;
1311
1312 if (!to_remove)
1313 return -1;
1314
1315 hlist_del(&to_remove->next);
1316 del_timer(&to_remove->timer);
1317
1318 /*
1319 * If this is the only MAC connected to this VCC,
1320 * also tear down the VCC
1321 */
1322 if (to_remove->status >= ESI_FLUSH_PENDING) {
1323 /*
1324 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1325 */
1326 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1327 hlist_for_each_entry(entry, node,
1328 &priv->lec_arp_tables[i], next) {
1329 if (memcmp(to_remove->atm_addr,
1330 entry->atm_addr, ATM_ESA_LEN) == 0) {
1331 remove_vcc = 0;
1332 break;
1333 }
1334 }
1335 }
1336 if (remove_vcc)
1337 lec_arp_clear_vccs(to_remove);
1338 }
1339 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1340
1341 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1342 return 0;
1343 }
1344
1345 #if DEBUG_ARP_TABLE
1346 static const char *get_status_string(unsigned char st)
1347 {
1348 switch (st) {
1349 case ESI_UNKNOWN:
1350 return "ESI_UNKNOWN";
1351 case ESI_ARP_PENDING:
1352 return "ESI_ARP_PENDING";
1353 case ESI_VC_PENDING:
1354 return "ESI_VC_PENDING";
1355 case ESI_FLUSH_PENDING:
1356 return "ESI_FLUSH_PENDING";
1357 case ESI_FORWARD_DIRECT:
1358 return "ESI_FORWARD_DIRECT";
1359 }
1360 return "<UNKNOWN>";
1361 }
1362
1363 static void dump_arp_table(struct lec_priv *priv)
1364 {
1365 struct hlist_node *node;
1366 struct lec_arp_table *rulla;
1367 char buf[256];
1368 int i, j, offset;
1369
1370 pr_info("Dump %p:\n", priv);
1371 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1372 hlist_for_each_entry(rulla, node,
1373 &priv->lec_arp_tables[i], next) {
1374 offset = 0;
1375 offset += sprintf(buf, "%d: %p\n", i, rulla);
1376 offset += sprintf(buf + offset, "Mac: %pM",
1377 rulla->mac_addr);
1378 offset += sprintf(buf + offset, " Atm:");
1379 for (j = 0; j < ATM_ESA_LEN; j++) {
1380 offset += sprintf(buf + offset,
1381 "%2.2x ",
1382 rulla->atm_addr[j] & 0xff);
1383 }
1384 offset += sprintf(buf + offset,
1385 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1386 rulla->vcc ? rulla->vcc->vpi : 0,
1387 rulla->vcc ? rulla->vcc->vci : 0,
1388 rulla->recv_vcc ? rulla->recv_vcc->
1389 vpi : 0,
1390 rulla->recv_vcc ? rulla->recv_vcc->
1391 vci : 0, rulla->last_used,
1392 rulla->timestamp, rulla->no_tries);
1393 offset +=
1394 sprintf(buf + offset,
1395 "Flags:%x, Packets_flooded:%x, Status: %s ",
1396 rulla->flags, rulla->packets_flooded,
1397 get_status_string(rulla->status));
1398 pr_info("%s\n", buf);
1399 }
1400 }
1401
1402 if (!hlist_empty(&priv->lec_no_forward))
1403 pr_info("No forward\n");
1404 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1405 offset = 0;
1406 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1407 offset += sprintf(buf + offset, " Atm:");
1408 for (j = 0; j < ATM_ESA_LEN; j++) {
1409 offset += sprintf(buf + offset, "%2.2x ",
1410 rulla->atm_addr[j] & 0xff);
1411 }
1412 offset += sprintf(buf + offset,
1413 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1414 rulla->vcc ? rulla->vcc->vpi : 0,
1415 rulla->vcc ? rulla->vcc->vci : 0,
1416 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1417 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1418 rulla->last_used,
1419 rulla->timestamp, rulla->no_tries);
1420 offset += sprintf(buf + offset,
1421 "Flags:%x, Packets_flooded:%x, Status: %s ",
1422 rulla->flags, rulla->packets_flooded,
1423 get_status_string(rulla->status));
1424 pr_info("%s\n", buf);
1425 }
1426
1427 if (!hlist_empty(&priv->lec_arp_empty_ones))
1428 pr_info("Empty ones\n");
1429 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1430 offset = 0;
1431 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1432 offset += sprintf(buf + offset, " Atm:");
1433 for (j = 0; j < ATM_ESA_LEN; j++) {
1434 offset += sprintf(buf + offset, "%2.2x ",
1435 rulla->atm_addr[j] & 0xff);
1436 }
1437 offset += sprintf(buf + offset,
1438 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1439 rulla->vcc ? rulla->vcc->vpi : 0,
1440 rulla->vcc ? rulla->vcc->vci : 0,
1441 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1442 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1443 rulla->last_used,
1444 rulla->timestamp, rulla->no_tries);
1445 offset += sprintf(buf + offset,
1446 "Flags:%x, Packets_flooded:%x, Status: %s ",
1447 rulla->flags, rulla->packets_flooded,
1448 get_status_string(rulla->status));
1449 pr_info("%s", buf);
1450 }
1451
1452 if (!hlist_empty(&priv->mcast_fwds))
1453 pr_info("Multicast Forward VCCs\n");
1454 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1455 offset = 0;
1456 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1457 offset += sprintf(buf + offset, " Atm:");
1458 for (j = 0; j < ATM_ESA_LEN; j++) {
1459 offset += sprintf(buf + offset, "%2.2x ",
1460 rulla->atm_addr[j] & 0xff);
1461 }
1462 offset += sprintf(buf + offset,
1463 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1464 rulla->vcc ? rulla->vcc->vpi : 0,
1465 rulla->vcc ? rulla->vcc->vci : 0,
1466 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1467 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1468 rulla->last_used,
1469 rulla->timestamp, rulla->no_tries);
1470 offset += sprintf(buf + offset,
1471 "Flags:%x, Packets_flooded:%x, Status: %s ",
1472 rulla->flags, rulla->packets_flooded,
1473 get_status_string(rulla->status));
1474 pr_info("%s\n", buf);
1475 }
1476
1477 }
1478 #else
1479 #define dump_arp_table(priv) do { } while (0)
1480 #endif
1481
1482 /*
1483 * Destruction of arp-cache
1484 */
1485 static void lec_arp_destroy(struct lec_priv *priv)
1486 {
1487 unsigned long flags;
1488 struct hlist_node *node, *next;
1489 struct lec_arp_table *entry;
1490 int i;
1491
1492 cancel_delayed_work_sync(&priv->lec_arp_work);
1493
1494 /*
1495 * Remove all entries
1496 */
1497
1498 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1499 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1500 hlist_for_each_entry_safe(entry, node, next,
1501 &priv->lec_arp_tables[i], next) {
1502 lec_arp_remove(priv, entry);
1503 lec_arp_put(entry);
1504 }
1505 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1506 }
1507
1508 hlist_for_each_entry_safe(entry, node, next,
1509 &priv->lec_arp_empty_ones, next) {
1510 del_timer_sync(&entry->timer);
1511 lec_arp_clear_vccs(entry);
1512 hlist_del(&entry->next);
1513 lec_arp_put(entry);
1514 }
1515 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1516
1517 hlist_for_each_entry_safe(entry, node, next,
1518 &priv->lec_no_forward, next) {
1519 del_timer_sync(&entry->timer);
1520 lec_arp_clear_vccs(entry);
1521 hlist_del(&entry->next);
1522 lec_arp_put(entry);
1523 }
1524 INIT_HLIST_HEAD(&priv->lec_no_forward);
1525
1526 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1527 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1528 lec_arp_clear_vccs(entry);
1529 hlist_del(&entry->next);
1530 lec_arp_put(entry);
1531 }
1532 INIT_HLIST_HEAD(&priv->mcast_fwds);
1533 priv->mcast_vcc = NULL;
1534 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1535 }
1536
1537 /*
1538 * Find entry by mac_address
1539 */
1540 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1541 const unsigned char *mac_addr)
1542 {
1543 struct hlist_node *node;
1544 struct hlist_head *head;
1545 struct lec_arp_table *entry;
1546
1547 pr_debug("%pM\n", mac_addr);
1548
1549 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1550 hlist_for_each_entry(entry, node, head, next) {
1551 if (ether_addr_equal(mac_addr, entry->mac_addr))
1552 return entry;
1553 }
1554 return NULL;
1555 }
1556
1557 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1558 const unsigned char *mac_addr)
1559 {
1560 struct lec_arp_table *to_return;
1561
1562 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1563 if (!to_return) {
1564 pr_info("LEC: Arp entry kmalloc failed\n");
1565 return NULL;
1566 }
1567 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1568 INIT_HLIST_NODE(&to_return->next);
1569 setup_timer(&to_return->timer, lec_arp_expire_arp,
1570 (unsigned long)to_return);
1571 to_return->last_used = jiffies;
1572 to_return->priv = priv;
1573 skb_queue_head_init(&to_return->tx_wait);
1574 atomic_set(&to_return->usage, 1);
1575 return to_return;
1576 }
1577
1578 /* Arp sent timer expired */
1579 static void lec_arp_expire_arp(unsigned long data)
1580 {
1581 struct lec_arp_table *entry;
1582
1583 entry = (struct lec_arp_table *)data;
1584
1585 pr_debug("\n");
1586 if (entry->status == ESI_ARP_PENDING) {
1587 if (entry->no_tries <= entry->priv->max_retry_count) {
1588 if (entry->is_rdesc)
1589 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1590 entry->mac_addr, NULL, NULL);
1591 else
1592 send_to_lecd(entry->priv, l_arp_xmt,
1593 entry->mac_addr, NULL, NULL);
1594 entry->no_tries++;
1595 }
1596 mod_timer(&entry->timer, jiffies + (1 * HZ));
1597 }
1598 }
1599
1600 /* Unknown/unused vcc expire, remove associated entry */
1601 static void lec_arp_expire_vcc(unsigned long data)
1602 {
1603 unsigned long flags;
1604 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1605 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1606
1607 del_timer(&to_remove->timer);
1608
1609 pr_debug("%p %p: vpi:%d vci:%d\n",
1610 to_remove, priv,
1611 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1612 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1613
1614 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1615 hlist_del(&to_remove->next);
1616 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1617
1618 lec_arp_clear_vccs(to_remove);
1619 lec_arp_put(to_remove);
1620 }
1621
1622 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1623 unsigned long now,
1624 struct lec_priv *priv)
1625 {
1626 unsigned long time_to_check;
1627
1628 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1629 time_to_check = priv->forward_delay_time;
1630 else
1631 time_to_check = priv->aging_time;
1632
1633 pr_debug("About to expire: %lx - %lx > %lx\n",
1634 now, entry->last_used, time_to_check);
1635 if (time_after(now, entry->last_used + time_to_check) &&
1636 !(entry->flags & LEC_PERMANENT_FLAG) &&
1637 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1638 /* Remove entry */
1639 pr_debug("Entry timed out\n");
1640 lec_arp_remove(priv, entry);
1641 lec_arp_put(entry);
1642 } else {
1643 /* Something else */
1644 if ((entry->status == ESI_VC_PENDING ||
1645 entry->status == ESI_ARP_PENDING) &&
1646 time_after_eq(now, entry->timestamp +
1647 priv->max_unknown_frame_time)) {
1648 entry->timestamp = jiffies;
1649 entry->packets_flooded = 0;
1650 if (entry->status == ESI_VC_PENDING)
1651 send_to_lecd(priv, l_svc_setup,
1652 entry->mac_addr,
1653 entry->atm_addr,
1654 NULL);
1655 }
1656 if (entry->status == ESI_FLUSH_PENDING &&
1657 time_after_eq(now, entry->timestamp +
1658 priv->path_switching_delay)) {
1659 lec_arp_hold(entry);
1660 return true;
1661 }
1662 }
1663
1664 return false;
1665 }
1666 /*
1667 * Expire entries.
1668 * 1. Re-set timer
1669 * 2. For each entry, delete entries that have aged past the age limit.
1670 * 3. For each entry, depending on the status of the entry, perform
1671 * the following maintenance.
1672 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1673 * tick_count is above the max_unknown_frame_time, clear
1674 * the tick_count to zero and clear the packets_flooded counter
1675 * to zero. This supports the packet rate limit per address
1676 * while flooding unknowns.
1677 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1678 * than or equal to the path_switching_delay, change the status
1679 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1680 * regardless of the progress of the flush protocol.
1681 */
1682 static void lec_arp_check_expire(struct work_struct *work)
1683 {
1684 unsigned long flags;
1685 struct lec_priv *priv =
1686 container_of(work, struct lec_priv, lec_arp_work.work);
1687 struct hlist_node *node, *next;
1688 struct lec_arp_table *entry;
1689 unsigned long now;
1690 int i;
1691
1692 pr_debug("%p\n", priv);
1693 now = jiffies;
1694 restart:
1695 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1696 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1697 hlist_for_each_entry_safe(entry, node, next,
1698 &priv->lec_arp_tables[i], next) {
1699 if (__lec_arp_check_expire(entry, now, priv)) {
1700 struct sk_buff *skb;
1701 struct atm_vcc *vcc = entry->vcc;
1702
1703 spin_unlock_irqrestore(&priv->lec_arp_lock,
1704 flags);
1705 while ((skb = skb_dequeue(&entry->tx_wait)))
1706 lec_send(vcc, skb);
1707 entry->last_used = jiffies;
1708 entry->status = ESI_FORWARD_DIRECT;
1709 lec_arp_put(entry);
1710
1711 goto restart;
1712 }
1713 }
1714 }
1715 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1716
1717 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1718 }
1719
1720 /*
1721 * Try to find vcc where mac_address is attached.
1722 *
1723 */
1724 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1725 const unsigned char *mac_to_find,
1726 int is_rdesc,
1727 struct lec_arp_table **ret_entry)
1728 {
1729 unsigned long flags;
1730 struct lec_arp_table *entry;
1731 struct atm_vcc *found;
1732
1733 if (mac_to_find[0] & 0x01) {
1734 switch (priv->lane_version) {
1735 case 1:
1736 return priv->mcast_vcc;
1737 case 2: /* LANE2 wants arp for multicast addresses */
1738 if (ether_addr_equal(mac_to_find, bus_mac))
1739 return priv->mcast_vcc;
1740 break;
1741 default:
1742 break;
1743 }
1744 }
1745
1746 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1747 entry = lec_arp_find(priv, mac_to_find);
1748
1749 if (entry) {
1750 if (entry->status == ESI_FORWARD_DIRECT) {
1751 /* Connection Ok */
1752 entry->last_used = jiffies;
1753 lec_arp_hold(entry);
1754 *ret_entry = entry;
1755 found = entry->vcc;
1756 goto out;
1757 }
1758 /*
1759 * If the LE_ARP cache entry is still pending, reset count to 0
1760 * so another LE_ARP request can be made for this frame.
1761 */
1762 if (entry->status == ESI_ARP_PENDING)
1763 entry->no_tries = 0;
1764 /*
1765 * Data direct VC not yet set up, check to see if the unknown
1766 * frame count is greater than the limit. If the limit has
1767 * not been reached, allow the caller to send packet to
1768 * BUS.
1769 */
1770 if (entry->status != ESI_FLUSH_PENDING &&
1771 entry->packets_flooded <
1772 priv->maximum_unknown_frame_count) {
1773 entry->packets_flooded++;
1774 pr_debug("Flooding..\n");
1775 found = priv->mcast_vcc;
1776 goto out;
1777 }
1778 /*
1779 * We got here because entry->status == ESI_FLUSH_PENDING
1780 * or BUS flood limit was reached for an entry which is
1781 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1782 */
1783 lec_arp_hold(entry);
1784 *ret_entry = entry;
1785 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1786 entry->vcc);
1787 found = NULL;
1788 } else {
1789 /* No matching entry was found */
1790 entry = make_entry(priv, mac_to_find);
1791 pr_debug("Making entry\n");
1792 if (!entry) {
1793 found = priv->mcast_vcc;
1794 goto out;
1795 }
1796 lec_arp_add(priv, entry);
1797 /* We want arp-request(s) to be sent */
1798 entry->packets_flooded = 1;
1799 entry->status = ESI_ARP_PENDING;
1800 entry->no_tries = 1;
1801 entry->last_used = entry->timestamp = jiffies;
1802 entry->is_rdesc = is_rdesc;
1803 if (entry->is_rdesc)
1804 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1805 NULL);
1806 else
1807 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1808 entry->timer.expires = jiffies + (1 * HZ);
1809 entry->timer.function = lec_arp_expire_arp;
1810 add_timer(&entry->timer);
1811 found = priv->mcast_vcc;
1812 }
1813
1814 out:
1815 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1816 return found;
1817 }
1818
1819 static int
1820 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1821 unsigned long permanent)
1822 {
1823 unsigned long flags;
1824 struct hlist_node *node, *next;
1825 struct lec_arp_table *entry;
1826 int i;
1827
1828 pr_debug("\n");
1829 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1830 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1831 hlist_for_each_entry_safe(entry, node, next,
1832 &priv->lec_arp_tables[i], next) {
1833 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1834 (permanent ||
1835 !(entry->flags & LEC_PERMANENT_FLAG))) {
1836 lec_arp_remove(priv, entry);
1837 lec_arp_put(entry);
1838 }
1839 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1840 return 0;
1841 }
1842 }
1843 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1844 return -1;
1845 }
1846
1847 /*
1848 * Notifies: Response to arp_request (atm_addr != NULL)
1849 */
1850 static void
1851 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1852 const unsigned char *atm_addr, unsigned long remoteflag,
1853 unsigned int targetless_le_arp)
1854 {
1855 unsigned long flags;
1856 struct hlist_node *node, *next;
1857 struct lec_arp_table *entry, *tmp;
1858 int i;
1859
1860 pr_debug("%smac:%pM\n",
1861 (targetless_le_arp) ? "targetless " : "", mac_addr);
1862
1863 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1864 entry = lec_arp_find(priv, mac_addr);
1865 if (entry == NULL && targetless_le_arp)
1866 goto out; /*
1867 * LANE2: ignore targetless LE_ARPs for which
1868 * we have no entry in the cache. 7.1.30
1869 */
1870 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1871 hlist_for_each_entry_safe(entry, node, next,
1872 &priv->lec_arp_empty_ones, next) {
1873 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1874 hlist_del(&entry->next);
1875 del_timer(&entry->timer);
1876 tmp = lec_arp_find(priv, mac_addr);
1877 if (tmp) {
1878 del_timer(&tmp->timer);
1879 tmp->status = ESI_FORWARD_DIRECT;
1880 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1881 tmp->vcc = entry->vcc;
1882 tmp->old_push = entry->old_push;
1883 tmp->last_used = jiffies;
1884 del_timer(&entry->timer);
1885 lec_arp_put(entry);
1886 entry = tmp;
1887 } else {
1888 entry->status = ESI_FORWARD_DIRECT;
1889 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
1890 entry->last_used = jiffies;
1891 lec_arp_add(priv, entry);
1892 }
1893 if (remoteflag)
1894 entry->flags |= LEC_REMOTE_FLAG;
1895 else
1896 entry->flags &= ~LEC_REMOTE_FLAG;
1897 pr_debug("After update\n");
1898 dump_arp_table(priv);
1899 goto out;
1900 }
1901 }
1902 }
1903
1904 entry = lec_arp_find(priv, mac_addr);
1905 if (!entry) {
1906 entry = make_entry(priv, mac_addr);
1907 if (!entry)
1908 goto out;
1909 entry->status = ESI_UNKNOWN;
1910 lec_arp_add(priv, entry);
1911 /* Temporary, changes before end of function */
1912 }
1913 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1914 del_timer(&entry->timer);
1915 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1916 hlist_for_each_entry(tmp, node,
1917 &priv->lec_arp_tables[i], next) {
1918 if (entry != tmp &&
1919 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1920 /* Vcc to this host exists */
1921 if (tmp->status > ESI_VC_PENDING) {
1922 /*
1923 * ESI_FLUSH_PENDING,
1924 * ESI_FORWARD_DIRECT
1925 */
1926 entry->vcc = tmp->vcc;
1927 entry->old_push = tmp->old_push;
1928 }
1929 entry->status = tmp->status;
1930 break;
1931 }
1932 }
1933 }
1934 if (remoteflag)
1935 entry->flags |= LEC_REMOTE_FLAG;
1936 else
1937 entry->flags &= ~LEC_REMOTE_FLAG;
1938 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1939 entry->status = ESI_VC_PENDING;
1940 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1941 }
1942 pr_debug("After update2\n");
1943 dump_arp_table(priv);
1944 out:
1945 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1946 }
1947
1948 /*
1949 * Notifies: Vcc setup ready
1950 */
1951 static void
1952 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1953 struct atm_vcc *vcc,
1954 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1955 {
1956 unsigned long flags;
1957 struct hlist_node *node;
1958 struct lec_arp_table *entry;
1959 int i, found_entry = 0;
1960
1961 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1962 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1963 if (ioc_data->receive == 2) {
1964 pr_debug("LEC_ARP: Attaching mcast forward\n");
1965 #if 0
1966 entry = lec_arp_find(priv, bus_mac);
1967 if (!entry) {
1968 pr_info("LEC_ARP: Multicast entry not found!\n");
1969 goto out;
1970 }
1971 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1972 entry->recv_vcc = vcc;
1973 entry->old_recv_push = old_push;
1974 #endif
1975 entry = make_entry(priv, bus_mac);
1976 if (entry == NULL)
1977 goto out;
1978 del_timer(&entry->timer);
1979 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1980 entry->recv_vcc = vcc;
1981 entry->old_recv_push = old_push;
1982 hlist_add_head(&entry->next, &priv->mcast_fwds);
1983 goto out;
1984 } else if (ioc_data->receive == 1) {
1985 /*
1986 * Vcc which we don't want to make default vcc,
1987 * attach it anyway.
1988 */
1989 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",
1990 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1991 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1992 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1993 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1994 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1995 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1996 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1997 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1998 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1999 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2000 entry = make_entry(priv, bus_mac);
2001 if (entry == NULL)
2002 goto out;
2003 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2004 memset(entry->mac_addr, 0, ETH_ALEN);
2005 entry->recv_vcc = vcc;
2006 entry->old_recv_push = old_push;
2007 entry->status = ESI_UNKNOWN;
2008 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2009 entry->timer.function = lec_arp_expire_vcc;
2010 hlist_add_head(&entry->next, &priv->lec_no_forward);
2011 add_timer(&entry->timer);
2012 dump_arp_table(priv);
2013 goto out;
2014 }
2015 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",
2016 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2017 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2018 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2019 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2020 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2021 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2022 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2023 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2024 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2025 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2026 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2027 hlist_for_each_entry(entry, node,
2028 &priv->lec_arp_tables[i], next) {
2029 if (memcmp
2030 (ioc_data->atm_addr, entry->atm_addr,
2031 ATM_ESA_LEN) == 0) {
2032 pr_debug("LEC_ARP: Attaching data direct\n");
2033 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2034 entry->vcc ? entry->vcc->vci : 0,
2035 entry->recv_vcc ? entry->recv_vcc->
2036 vci : 0);
2037 found_entry = 1;
2038 del_timer(&entry->timer);
2039 entry->vcc = vcc;
2040 entry->old_push = old_push;
2041 if (entry->status == ESI_VC_PENDING) {
2042 if (priv->maximum_unknown_frame_count
2043 == 0)
2044 entry->status =
2045 ESI_FORWARD_DIRECT;
2046 else {
2047 entry->timestamp = jiffies;
2048 entry->status =
2049 ESI_FLUSH_PENDING;
2050 #if 0
2051 send_to_lecd(priv, l_flush_xmt,
2052 NULL,
2053 entry->atm_addr,
2054 NULL);
2055 #endif
2056 }
2057 } else {
2058 /*
2059 * They were forming a connection
2060 * to us, and we to them. Our
2061 * ATM address is numerically lower
2062 * than theirs, so we make connection
2063 * we formed into default VCC (8.1.11).
2064 * Connection they made gets torn
2065 * down. This might confuse some
2066 * clients. Can be changed if
2067 * someone reports trouble...
2068 */
2069 ;
2070 }
2071 }
2072 }
2073 }
2074 if (found_entry) {
2075 pr_debug("After vcc was added\n");
2076 dump_arp_table(priv);
2077 goto out;
2078 }
2079 /*
2080 * Not found, snatch address from first data packet that arrives
2081 * from this vcc
2082 */
2083 entry = make_entry(priv, bus_mac);
2084 if (!entry)
2085 goto out;
2086 entry->vcc = vcc;
2087 entry->old_push = old_push;
2088 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2089 memset(entry->mac_addr, 0, ETH_ALEN);
2090 entry->status = ESI_UNKNOWN;
2091 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2092 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2093 entry->timer.function = lec_arp_expire_vcc;
2094 add_timer(&entry->timer);
2095 pr_debug("After vcc was added\n");
2096 dump_arp_table(priv);
2097 out:
2098 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2099 }
2100
2101 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2102 {
2103 unsigned long flags;
2104 struct hlist_node *node;
2105 struct lec_arp_table *entry;
2106 int i;
2107
2108 pr_debug("%lx\n", tran_id);
2109 restart:
2110 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2111 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2112 hlist_for_each_entry(entry, node,
2113 &priv->lec_arp_tables[i], next) {
2114 if (entry->flush_tran_id == tran_id &&
2115 entry->status == ESI_FLUSH_PENDING) {
2116 struct sk_buff *skb;
2117 struct atm_vcc *vcc = entry->vcc;
2118
2119 lec_arp_hold(entry);
2120 spin_unlock_irqrestore(&priv->lec_arp_lock,
2121 flags);
2122 while ((skb = skb_dequeue(&entry->tx_wait)))
2123 lec_send(vcc, skb);
2124 entry->last_used = jiffies;
2125 entry->status = ESI_FORWARD_DIRECT;
2126 lec_arp_put(entry);
2127 pr_debug("LEC_ARP: Flushed\n");
2128 goto restart;
2129 }
2130 }
2131 }
2132 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2133 dump_arp_table(priv);
2134 }
2135
2136 static void
2137 lec_set_flush_tran_id(struct lec_priv *priv,
2138 const unsigned char *atm_addr, unsigned long tran_id)
2139 {
2140 unsigned long flags;
2141 struct hlist_node *node;
2142 struct lec_arp_table *entry;
2143 int i;
2144
2145 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2146 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2147 hlist_for_each_entry(entry, node,
2148 &priv->lec_arp_tables[i], next) {
2149 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2150 entry->flush_tran_id = tran_id;
2151 pr_debug("Set flush transaction id to %lx for %p\n",
2152 tran_id, entry);
2153 }
2154 }
2155 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2156 }
2157
2158 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2159 {
2160 unsigned long flags;
2161 unsigned char mac_addr[] = {
2162 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2163 };
2164 struct lec_arp_table *to_add;
2165 struct lec_vcc_priv *vpriv;
2166 int err = 0;
2167
2168 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2169 if (!vpriv)
2170 return -ENOMEM;
2171 vpriv->xoff = 0;
2172 vpriv->old_pop = vcc->pop;
2173 vcc->user_back = vpriv;
2174 vcc->pop = lec_pop;
2175 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2176 to_add = make_entry(priv, mac_addr);
2177 if (!to_add) {
2178 vcc->pop = vpriv->old_pop;
2179 kfree(vpriv);
2180 err = -ENOMEM;
2181 goto out;
2182 }
2183 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2184 to_add->status = ESI_FORWARD_DIRECT;
2185 to_add->flags |= LEC_PERMANENT_FLAG;
2186 to_add->vcc = vcc;
2187 to_add->old_push = vcc->push;
2188 vcc->push = lec_push;
2189 priv->mcast_vcc = vcc;
2190 lec_arp_add(priv, to_add);
2191 out:
2192 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2193 return err;
2194 }
2195
2196 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2197 {
2198 unsigned long flags;
2199 struct hlist_node *node, *next;
2200 struct lec_arp_table *entry;
2201 int i;
2202
2203 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2204 dump_arp_table(priv);
2205
2206 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2207
2208 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2209 hlist_for_each_entry_safe(entry, node, next,
2210 &priv->lec_arp_tables[i], next) {
2211 if (vcc == entry->vcc) {
2212 lec_arp_remove(priv, entry);
2213 lec_arp_put(entry);
2214 if (priv->mcast_vcc == vcc)
2215 priv->mcast_vcc = NULL;
2216 }
2217 }
2218 }
2219
2220 hlist_for_each_entry_safe(entry, node, next,
2221 &priv->lec_arp_empty_ones, next) {
2222 if (entry->vcc == vcc) {
2223 lec_arp_clear_vccs(entry);
2224 del_timer(&entry->timer);
2225 hlist_del(&entry->next);
2226 lec_arp_put(entry);
2227 }
2228 }
2229
2230 hlist_for_each_entry_safe(entry, node, next,
2231 &priv->lec_no_forward, next) {
2232 if (entry->recv_vcc == vcc) {
2233 lec_arp_clear_vccs(entry);
2234 del_timer(&entry->timer);
2235 hlist_del(&entry->next);
2236 lec_arp_put(entry);
2237 }
2238 }
2239
2240 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2241 if (entry->recv_vcc == vcc) {
2242 lec_arp_clear_vccs(entry);
2243 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2244 hlist_del(&entry->next);
2245 lec_arp_put(entry);
2246 }
2247 }
2248
2249 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2250 dump_arp_table(priv);
2251 }
2252
2253 static void
2254 lec_arp_check_empties(struct lec_priv *priv,
2255 struct atm_vcc *vcc, struct sk_buff *skb)
2256 {
2257 unsigned long flags;
2258 struct hlist_node *node, *next;
2259 struct lec_arp_table *entry, *tmp;
2260 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2261 unsigned char *src = hdr->h_source;
2262
2263 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2264 hlist_for_each_entry_safe(entry, node, next,
2265 &priv->lec_arp_empty_ones, next) {
2266 if (vcc == entry->vcc) {
2267 del_timer(&entry->timer);
2268 memcpy(entry->mac_addr, src, ETH_ALEN);
2269 entry->status = ESI_FORWARD_DIRECT;
2270 entry->last_used = jiffies;
2271 /* We might have got an entry */
2272 tmp = lec_arp_find(priv, src);
2273 if (tmp) {
2274 lec_arp_remove(priv, tmp);
2275 lec_arp_put(tmp);
2276 }
2277 hlist_del(&entry->next);
2278 lec_arp_add(priv, entry);
2279 goto out;
2280 }
2281 }
2282 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2283 out:
2284 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2285 }
2286
2287 MODULE_LICENSE("GPL");
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