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ext4: fix WARN_ON from ext4_releasepage()
[linux-2.6.git] / net / atm / lec.c
blob2e3d942e77f133eb9197e295d419f7c71c4f8178
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 if (unlikely(!skb2)) {
235 kfree_skb(skb);
236 return NETDEV_TX_OK;
237 }
238 consume_skb(skb);
239 skb = skb2;
240 }
241 skb_push(skb, 2);
242
243 /* Put le header to place */
244 lec_h = (struct lecdatahdr_8023 *)skb->data;
245 lec_h->le_header = htons(priv->lecid);
246
247 #if DUMP_PACKETS >= 2
248 #define MAX_DUMP_SKB 99
249 #elif DUMP_PACKETS >= 1
250 #define MAX_DUMP_SKB 30
251 #endif
252 #if DUMP_PACKETS >= 1
253 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
254 dev->name, skb->len, priv->lecid);
255 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
256 skb->data, min(skb->len, MAX_DUMP_SKB), true);
257 #endif /* DUMP_PACKETS >= 1 */
258
259 /* Minimum ethernet-frame size */
260 min_frame_size = LEC_MINIMUM_8023_SIZE;
261 if (skb->len < min_frame_size) {
262 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
263 skb2 = skb_copy_expand(skb, 0,
264 min_frame_size - skb->truesize,
265 GFP_ATOMIC);
266 dev_kfree_skb(skb);
267 if (skb2 == NULL) {
268 dev->stats.tx_dropped++;
269 return NETDEV_TX_OK;
270 }
271 skb = skb2;
272 }
273 skb_put(skb, min_frame_size - skb->len);
274 }
275
276 /* Send to right vcc */
277 is_rdesc = 0;
278 dst = lec_h->h_dest;
279 entry = NULL;
280 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
281 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
282 dev->name, vcc, vcc ? vcc->flags : 0, entry);
283 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
284 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
285 pr_debug("%s:queuing packet, MAC address %pM\n",
286 dev->name, lec_h->h_dest);
287 skb_queue_tail(&entry->tx_wait, skb);
288 } else {
289 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
290 dev->name, lec_h->h_dest);
291 dev->stats.tx_dropped++;
292 dev_kfree_skb(skb);
293 }
294 goto out;
295 }
296 #if DUMP_PACKETS > 0
297 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
298 dev->name, vcc->vpi, vcc->vci);
299 #endif /* DUMP_PACKETS > 0 */
300
301 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
302 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
303 lec_send(vcc, skb2);
304 }
305
306 lec_send(vcc, skb);
307
308 if (!atm_may_send(vcc, 0)) {
309 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
310
311 vpriv->xoff = 1;
312 netif_stop_queue(dev);
313
314 /*
315 * vcc->pop() might have occurred in between, making
316 * the vcc usuable again. Since xmit is serialized,
317 * this is the only situation we have to re-test.
318 */
319
320 if (atm_may_send(vcc, 0))
321 netif_wake_queue(dev);
322 }
323
324 out:
325 if (entry)
326 lec_arp_put(entry);
327 dev->trans_start = jiffies;
328 return NETDEV_TX_OK;
329 }
330
331 /* The inverse routine to net_open(). */
332 static int lec_close(struct net_device *dev)
333 {
334 netif_stop_queue(dev);
335 return 0;
336 }
337
338 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
339 {
340 unsigned long flags;
341 struct net_device *dev = (struct net_device *)vcc->proto_data;
342 struct lec_priv *priv = netdev_priv(dev);
343 struct atmlec_msg *mesg;
344 struct lec_arp_table *entry;
345 int i;
346 char *tmp; /* FIXME */
347
348 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
349 mesg = (struct atmlec_msg *)skb->data;
350 tmp = skb->data;
351 tmp += sizeof(struct atmlec_msg);
352 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
353 switch (mesg->type) {
354 case l_set_mac_addr:
355 for (i = 0; i < 6; i++)
356 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
357 break;
358 case l_del_mac_addr:
359 for (i = 0; i < 6; i++)
360 dev->dev_addr[i] = 0;
361 break;
362 case l_addr_delete:
363 lec_addr_delete(priv, mesg->content.normal.atm_addr,
364 mesg->content.normal.flag);
365 break;
366 case l_topology_change:
367 priv->topology_change = mesg->content.normal.flag;
368 break;
369 case l_flush_complete:
370 lec_flush_complete(priv, mesg->content.normal.flag);
371 break;
372 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
373 spin_lock_irqsave(&priv->lec_arp_lock, flags);
374 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
375 lec_arp_remove(priv, entry);
376 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
377
378 if (mesg->content.normal.no_source_le_narp)
379 break;
380 /* FALL THROUGH */
381 case l_arp_update:
382 lec_arp_update(priv, mesg->content.normal.mac_addr,
383 mesg->content.normal.atm_addr,
384 mesg->content.normal.flag,
385 mesg->content.normal.targetless_le_arp);
386 pr_debug("in l_arp_update\n");
387 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
388 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
389 mesg->sizeoftlvs);
390 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
391 tmp, mesg->sizeoftlvs);
392 }
393 break;
394 case l_config:
395 priv->maximum_unknown_frame_count =
396 mesg->content.config.maximum_unknown_frame_count;
397 priv->max_unknown_frame_time =
398 (mesg->content.config.max_unknown_frame_time * HZ);
399 priv->max_retry_count = mesg->content.config.max_retry_count;
400 priv->aging_time = (mesg->content.config.aging_time * HZ);
401 priv->forward_delay_time =
402 (mesg->content.config.forward_delay_time * HZ);
403 priv->arp_response_time =
404 (mesg->content.config.arp_response_time * HZ);
405 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
406 priv->path_switching_delay =
407 (mesg->content.config.path_switching_delay * HZ);
408 priv->lane_version = mesg->content.config.lane_version;
409 /* LANE2 */
410 priv->lane2_ops = NULL;
411 if (priv->lane_version > 1)
412 priv->lane2_ops = &lane2_ops;
413 if (dev_set_mtu(dev, mesg->content.config.mtu))
414 pr_info("%s: change_mtu to %d failed\n",
415 dev->name, mesg->content.config.mtu);
416 priv->is_proxy = mesg->content.config.is_proxy;
417 break;
418 case l_flush_tran_id:
419 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
420 mesg->content.normal.flag);
421 break;
422 case l_set_lecid:
423 priv->lecid =
424 (unsigned short)(0xffff & mesg->content.normal.flag);
425 break;
426 case l_should_bridge:
427 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
428 {
429 pr_debug("%s: bridge zeppelin asks about %pM\n",
430 dev->name, mesg->content.proxy.mac_addr);
431
432 if (br_fdb_test_addr_hook == NULL)
433 break;
434
435 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
436 /* hit from bridge table, send LE_ARP_RESPONSE */
437 struct sk_buff *skb2;
438 struct sock *sk;
439
440 pr_debug("%s: entry found, responding to zeppelin\n",
441 dev->name);
442 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
443 if (skb2 == NULL)
444 break;
445 skb2->len = sizeof(struct atmlec_msg);
446 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
447 atm_force_charge(priv->lecd, skb2->truesize);
448 sk = sk_atm(priv->lecd);
449 skb_queue_tail(&sk->sk_receive_queue, skb2);
450 sk->sk_data_ready(sk, skb2->len);
451 }
452 }
453 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
454 break;
455 default:
456 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
457 dev_kfree_skb(skb);
458 return -EINVAL;
459 }
460 dev_kfree_skb(skb);
461 return 0;
462 }
463
464 static void lec_atm_close(struct atm_vcc *vcc)
465 {
466 struct sk_buff *skb;
467 struct net_device *dev = (struct net_device *)vcc->proto_data;
468 struct lec_priv *priv = netdev_priv(dev);
469
470 priv->lecd = NULL;
471 /* Do something needful? */
472
473 netif_stop_queue(dev);
474 lec_arp_destroy(priv);
475
476 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
477 pr_info("%s closing with messages pending\n", dev->name);
478 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
479 atm_return(vcc, skb->truesize);
480 dev_kfree_skb(skb);
481 }
482
483 pr_info("%s: Shut down!\n", dev->name);
484 module_put(THIS_MODULE);
485 }
486
487 static struct atmdev_ops lecdev_ops = {
488 .close = lec_atm_close,
489 .send = lec_atm_send
490 };
491
492 static struct atm_dev lecatm_dev = {
493 .ops = &lecdev_ops,
494 .type = "lec",
495 .number = 999, /* dummy device number */
496 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
497 };
498
499 /*
500 * LANE2: new argument struct sk_buff *data contains
501 * the LE_ARP based TLVs introduced in the LANE2 spec
502 */
503 static int
504 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
505 const unsigned char *mac_addr, const unsigned char *atm_addr,
506 struct sk_buff *data)
507 {
508 struct sock *sk;
509 struct sk_buff *skb;
510 struct atmlec_msg *mesg;
511
512 if (!priv || !priv->lecd)
513 return -1;
514 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
515 if (!skb)
516 return -1;
517 skb->len = sizeof(struct atmlec_msg);
518 mesg = (struct atmlec_msg *)skb->data;
519 memset(mesg, 0, sizeof(struct atmlec_msg));
520 mesg->type = type;
521 if (data != NULL)
522 mesg->sizeoftlvs = data->len;
523 if (mac_addr)
524 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
525 else
526 mesg->content.normal.targetless_le_arp = 1;
527 if (atm_addr)
528 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
529
530 atm_force_charge(priv->lecd, skb->truesize);
531 sk = sk_atm(priv->lecd);
532 skb_queue_tail(&sk->sk_receive_queue, skb);
533 sk->sk_data_ready(sk, skb->len);
534
535 if (data != NULL) {
536 pr_debug("about to send %d bytes of data\n", data->len);
537 atm_force_charge(priv->lecd, data->truesize);
538 skb_queue_tail(&sk->sk_receive_queue, data);
539 sk->sk_data_ready(sk, skb->len);
540 }
541
542 return 0;
543 }
544
545 /* shamelessly stolen from drivers/net/net_init.c */
546 static int lec_change_mtu(struct net_device *dev, int new_mtu)
547 {
548 if ((new_mtu < 68) || (new_mtu > 18190))
549 return -EINVAL;
550 dev->mtu = new_mtu;
551 return 0;
552 }
553
554 static void lec_set_multicast_list(struct net_device *dev)
555 {
556 /*
557 * by default, all multicast frames arrive over the bus.
558 * eventually support selective multicast service
559 */
560 }
561
562 static const struct net_device_ops lec_netdev_ops = {
563 .ndo_open = lec_open,
564 .ndo_stop = lec_close,
565 .ndo_start_xmit = lec_start_xmit,
566 .ndo_change_mtu = lec_change_mtu,
567 .ndo_tx_timeout = lec_tx_timeout,
568 .ndo_set_rx_mode = lec_set_multicast_list,
569 };
570
571 static const unsigned char lec_ctrl_magic[] = {
572 0xff,
573 0x00,
574 0x01,
575 0x01
576 };
577
578 #define LEC_DATA_DIRECT_8023 2
579 #define LEC_DATA_DIRECT_8025 3
580
581 static int lec_is_data_direct(struct atm_vcc *vcc)
582 {
583 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
584 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
585 }
586
587 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
588 {
589 unsigned long flags;
590 struct net_device *dev = (struct net_device *)vcc->proto_data;
591 struct lec_priv *priv = netdev_priv(dev);
592
593 #if DUMP_PACKETS > 0
594 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
595 dev->name, vcc->vpi, vcc->vci);
596 #endif
597 if (!skb) {
598 pr_debug("%s: null skb\n", dev->name);
599 lec_vcc_close(priv, vcc);
600 return;
601 }
602 #if DUMP_PACKETS >= 2
603 #define MAX_SKB_DUMP 99
604 #elif DUMP_PACKETS >= 1
605 #define MAX_SKB_DUMP 30
606 #endif
607 #if DUMP_PACKETS > 0
608 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
609 dev->name, skb->len, priv->lecid);
610 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
611 skb->data, min(MAX_SKB_DUMP, skb->len), true);
612 #endif /* DUMP_PACKETS > 0 */
613 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
614 /* Control frame, to daemon */
615 struct sock *sk = sk_atm(vcc);
616
617 pr_debug("%s: To daemon\n", dev->name);
618 skb_queue_tail(&sk->sk_receive_queue, skb);
619 sk->sk_data_ready(sk, skb->len);
620 } else { /* Data frame, queue to protocol handlers */
621 struct lec_arp_table *entry;
622 unsigned char *src, *dst;
623
624 atm_return(vcc, skb->truesize);
625 if (*(__be16 *) skb->data == htons(priv->lecid) ||
626 !priv->lecd || !(dev->flags & IFF_UP)) {
627 /*
628 * Probably looping back, or if lecd is missing,
629 * lecd has gone down
630 */
631 pr_debug("Ignoring frame...\n");
632 dev_kfree_skb(skb);
633 return;
634 }
635 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
636
637 /*
638 * If this is a Data Direct VCC, and the VCC does not match
639 * the LE_ARP cache entry, delete the LE_ARP cache entry.
640 */
641 spin_lock_irqsave(&priv->lec_arp_lock, flags);
642 if (lec_is_data_direct(vcc)) {
643 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
644 entry = lec_arp_find(priv, src);
645 if (entry && entry->vcc != vcc) {
646 lec_arp_remove(priv, entry);
647 lec_arp_put(entry);
648 }
649 }
650 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
651
652 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
653 !priv->is_proxy && /* Proxy wants all the packets */
654 memcmp(dst, dev->dev_addr, dev->addr_len)) {
655 dev_kfree_skb(skb);
656 return;
657 }
658 if (!hlist_empty(&priv->lec_arp_empty_ones))
659 lec_arp_check_empties(priv, vcc, skb);
660 skb_pull(skb, 2); /* skip lec_id */
661 skb->protocol = eth_type_trans(skb, dev);
662 dev->stats.rx_packets++;
663 dev->stats.rx_bytes += skb->len;
664 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
665 netif_rx(skb);
666 }
667 }
668
669 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
670 {
671 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
672 struct net_device *dev = skb->dev;
673
674 if (vpriv == NULL) {
675 pr_info("vpriv = NULL!?!?!?\n");
676 return;
677 }
678
679 vpriv->old_pop(vcc, skb);
680
681 if (vpriv->xoff && atm_may_send(vcc, 0)) {
682 vpriv->xoff = 0;
683 if (netif_running(dev) && netif_queue_stopped(dev))
684 netif_wake_queue(dev);
685 }
686 }
687
688 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
689 {
690 struct lec_vcc_priv *vpriv;
691 int bytes_left;
692 struct atmlec_ioc ioc_data;
693
694 /* Lecd must be up in this case */
695 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
696 if (bytes_left != 0)
697 pr_info("copy from user failed for %d bytes\n", bytes_left);
698 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
699 !dev_lec[ioc_data.dev_num])
700 return -EINVAL;
701 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
702 if (!vpriv)
703 return -ENOMEM;
704 vpriv->xoff = 0;
705 vpriv->old_pop = vcc->pop;
706 vcc->user_back = vpriv;
707 vcc->pop = lec_pop;
708 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
709 &ioc_data, vcc, vcc->push);
710 vcc->proto_data = dev_lec[ioc_data.dev_num];
711 vcc->push = lec_push;
712 return 0;
713 }
714
715 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
716 {
717 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
718 return -EINVAL;
719 vcc->proto_data = dev_lec[arg];
720 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
721 }
722
723 /* Initialize device. */
724 static int lecd_attach(struct atm_vcc *vcc, int arg)
725 {
726 int i;
727 struct lec_priv *priv;
728
729 if (arg < 0)
730 i = 0;
731 else
732 i = arg;
733 if (arg >= MAX_LEC_ITF)
734 return -EINVAL;
735 if (!dev_lec[i]) {
736 int size;
737
738 size = sizeof(struct lec_priv);
739 dev_lec[i] = alloc_etherdev(size);
740 if (!dev_lec[i])
741 return -ENOMEM;
742 dev_lec[i]->netdev_ops = &lec_netdev_ops;
743 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
744 if (register_netdev(dev_lec[i])) {
745 free_netdev(dev_lec[i]);
746 return -EINVAL;
747 }
748
749 priv = netdev_priv(dev_lec[i]);
750 } else {
751 priv = netdev_priv(dev_lec[i]);
752 if (priv->lecd)
753 return -EADDRINUSE;
754 }
755 lec_arp_init(priv);
756 priv->itfnum = i; /* LANE2 addition */
757 priv->lecd = vcc;
758 vcc->dev = &lecatm_dev;
759 vcc_insert_socket(sk_atm(vcc));
760
761 vcc->proto_data = dev_lec[i];
762 set_bit(ATM_VF_META, &vcc->flags);
763 set_bit(ATM_VF_READY, &vcc->flags);
764
765 /* Set default values to these variables */
766 priv->maximum_unknown_frame_count = 1;
767 priv->max_unknown_frame_time = (1 * HZ);
768 priv->vcc_timeout_period = (1200 * HZ);
769 priv->max_retry_count = 1;
770 priv->aging_time = (300 * HZ);
771 priv->forward_delay_time = (15 * HZ);
772 priv->topology_change = 0;
773 priv->arp_response_time = (1 * HZ);
774 priv->flush_timeout = (4 * HZ);
775 priv->path_switching_delay = (6 * HZ);
776
777 if (dev_lec[i]->flags & IFF_UP)
778 netif_start_queue(dev_lec[i]);
779 __module_get(THIS_MODULE);
780 return i;
781 }
782
783 #ifdef CONFIG_PROC_FS
784 static const char *lec_arp_get_status_string(unsigned char status)
785 {
786 static const char *const lec_arp_status_string[] = {
787 "ESI_UNKNOWN ",
788 "ESI_ARP_PENDING ",
789 "ESI_VC_PENDING ",
790 "<Undefined> ",
791 "ESI_FLUSH_PENDING ",
792 "ESI_FORWARD_DIRECT"
793 };
794
795 if (status > ESI_FORWARD_DIRECT)
796 status = 3; /* ESI_UNDEFINED */
797 return lec_arp_status_string[status];
798 }
799
800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
801 {
802 int i;
803
804 for (i = 0; i < ETH_ALEN; i++)
805 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
806 seq_printf(seq, " ");
807 for (i = 0; i < ATM_ESA_LEN; i++)
808 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
809 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
810 entry->flags & 0xffff);
811 if (entry->vcc)
812 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
813 else
814 seq_printf(seq, " ");
815 if (entry->recv_vcc) {
816 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
817 entry->recv_vcc->vci);
818 }
819 seq_putc(seq, '\n');
820 }
821
822 struct lec_state {
823 unsigned long flags;
824 struct lec_priv *locked;
825 struct hlist_node *node;
826 struct net_device *dev;
827 int itf;
828 int arp_table;
829 int misc_table;
830 };
831
832 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
833 loff_t *l)
834 {
835 struct hlist_node *e = state->node;
836 struct lec_arp_table *tmp;
837
838 if (!e)
839 e = tbl->first;
840 if (e == SEQ_START_TOKEN) {
841 e = tbl->first;
842 --*l;
843 }
844
845 hlist_for_each_entry_from(tmp, e, next) {
846 if (--*l < 0)
847 break;
848 }
849 state->node = e;
850
851 return (*l < 0) ? state : NULL;
852 }
853
854 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
855 struct lec_priv *priv)
856 {
857 void *v = NULL;
858 int p;
859
860 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
861 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
862 if (v)
863 break;
864 }
865 state->arp_table = p;
866 return v;
867 }
868
869 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
870 struct lec_priv *priv)
871 {
872 struct hlist_head *lec_misc_tables[] = {
873 &priv->lec_arp_empty_ones,
874 &priv->lec_no_forward,
875 &priv->mcast_fwds
876 };
877 void *v = NULL;
878 int q;
879
880 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
881 v = lec_tbl_walk(state, lec_misc_tables[q], l);
882 if (v)
883 break;
884 }
885 state->misc_table = q;
886 return v;
887 }
888
889 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
890 struct lec_priv *priv)
891 {
892 if (!state->locked) {
893 state->locked = priv;
894 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
895 }
896 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
897 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
898 state->locked = NULL;
899 /* Partial state reset for the next time we get called */
900 state->arp_table = state->misc_table = 0;
901 }
902 return state->locked;
903 }
904
905 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
906 {
907 struct net_device *dev;
908 void *v;
909
910 dev = state->dev ? state->dev : dev_lec[state->itf];
911 v = (dev && netdev_priv(dev)) ?
912 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
913 if (!v && dev) {
914 dev_put(dev);
915 /* Partial state reset for the next time we get called */
916 dev = NULL;
917 }
918 state->dev = dev;
919 return v;
920 }
921
922 static void *lec_get_idx(struct lec_state *state, loff_t l)
923 {
924 void *v = NULL;
925
926 for (; state->itf < MAX_LEC_ITF; state->itf++) {
927 v = lec_itf_walk(state, &l);
928 if (v)
929 break;
930 }
931 return v;
932 }
933
934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
935 {
936 struct lec_state *state = seq->private;
937
938 state->itf = 0;
939 state->dev = NULL;
940 state->locked = NULL;
941 state->arp_table = 0;
942 state->misc_table = 0;
943 state->node = SEQ_START_TOKEN;
944
945 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
946 }
947
948 static void lec_seq_stop(struct seq_file *seq, void *v)
949 {
950 struct lec_state *state = seq->private;
951
952 if (state->dev) {
953 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
954 state->flags);
955 dev_put(state->dev);
956 }
957 }
958
959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
960 {
961 struct lec_state *state = seq->private;
962
963 v = lec_get_idx(state, 1);
964 *pos += !!PTR_ERR(v);
965 return v;
966 }
967
968 static int lec_seq_show(struct seq_file *seq, void *v)
969 {
970 static const char lec_banner[] =
971 "Itf MAC ATM destination"
972 " Status Flags "
973 "VPI/VCI Recv VPI/VCI\n";
974
975 if (v == SEQ_START_TOKEN)
976 seq_puts(seq, lec_banner);
977 else {
978 struct lec_state *state = seq->private;
979 struct net_device *dev = state->dev;
980 struct lec_arp_table *entry = hlist_entry(state->node,
981 struct lec_arp_table,
982 next);
983
984 seq_printf(seq, "%s ", dev->name);
985 lec_info(seq, entry);
986 }
987 return 0;
988 }
989
990 static const struct seq_operations lec_seq_ops = {
991 .start = lec_seq_start,
992 .next = lec_seq_next,
993 .stop = lec_seq_stop,
994 .show = lec_seq_show,
995 };
996
997 static int lec_seq_open(struct inode *inode, struct file *file)
998 {
999 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1000 }
1001
1002 static const struct file_operations lec_seq_fops = {
1003 .owner = THIS_MODULE,
1004 .open = lec_seq_open,
1005 .read = seq_read,
1006 .llseek = seq_lseek,
1007 .release = seq_release_private,
1008 };
1009 #endif
1010
1011 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1012 {
1013 struct atm_vcc *vcc = ATM_SD(sock);
1014 int err = 0;
1015
1016 switch (cmd) {
1017 case ATMLEC_CTRL:
1018 case ATMLEC_MCAST:
1019 case ATMLEC_DATA:
1020 if (!capable(CAP_NET_ADMIN))
1021 return -EPERM;
1022 break;
1023 default:
1024 return -ENOIOCTLCMD;
1025 }
1026
1027 switch (cmd) {
1028 case ATMLEC_CTRL:
1029 err = lecd_attach(vcc, (int)arg);
1030 if (err >= 0)
1031 sock->state = SS_CONNECTED;
1032 break;
1033 case ATMLEC_MCAST:
1034 err = lec_mcast_attach(vcc, (int)arg);
1035 break;
1036 case ATMLEC_DATA:
1037 err = lec_vcc_attach(vcc, (void __user *)arg);
1038 break;
1039 }
1040
1041 return err;
1042 }
1043
1044 static struct atm_ioctl lane_ioctl_ops = {
1045 .owner = THIS_MODULE,
1046 .ioctl = lane_ioctl,
1047 };
1048
1049 static int __init lane_module_init(void)
1050 {
1051 #ifdef CONFIG_PROC_FS
1052 struct proc_dir_entry *p;
1053
1054 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1055 if (!p) {
1056 pr_err("Unable to initialize /proc/net/atm/lec\n");
1057 return -ENOMEM;
1058 }
1059 #endif
1060
1061 register_atm_ioctl(&lane_ioctl_ops);
1062 pr_info("lec.c: initialized\n");
1063 return 0;
1064 }
1065
1066 static void __exit lane_module_cleanup(void)
1067 {
1068 int i;
1069
1070 remove_proc_entry("lec", atm_proc_root);
1071
1072 deregister_atm_ioctl(&lane_ioctl_ops);
1073
1074 for (i = 0; i < MAX_LEC_ITF; i++) {
1075 if (dev_lec[i] != NULL) {
1076 unregister_netdev(dev_lec[i]);
1077 free_netdev(dev_lec[i]);
1078 dev_lec[i] = NULL;
1079 }
1080 }
1081 }
1082
1083 module_init(lane_module_init);
1084 module_exit(lane_module_cleanup);
1085
1086 /*
1087 * LANE2: 3.1.3, LE_RESOLVE.request
1088 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1089 * If sizeoftlvs == NULL the default TLVs associated with with this
1090 * lec will be used.
1091 * If dst_mac == NULL, targetless LE_ARP will be sent
1092 */
1093 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1094 u8 **tlvs, u32 *sizeoftlvs)
1095 {
1096 unsigned long flags;
1097 struct lec_priv *priv = netdev_priv(dev);
1098 struct lec_arp_table *table;
1099 struct sk_buff *skb;
1100 int retval;
1101
1102 if (force == 0) {
1103 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1104 table = lec_arp_find(priv, dst_mac);
1105 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1106 if (table == NULL)
1107 return -1;
1108
1109 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1110 if (*tlvs == NULL)
1111 return -1;
1112
1113 *sizeoftlvs = table->sizeoftlvs;
1114
1115 return 0;
1116 }
1117
1118 if (sizeoftlvs == NULL)
1119 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1120
1121 else {
1122 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1123 if (skb == NULL)
1124 return -1;
1125 skb->len = *sizeoftlvs;
1126 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1127 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1128 }
1129 return retval;
1130 }
1131
1132 /*
1133 * LANE2: 3.1.4, LE_ASSOCIATE.request
1134 * Associate the *tlvs with the *lan_dst address.
1135 * Will overwrite any previous association
1136 * Returns 1 for success, 0 for failure (out of memory)
1137 *
1138 */
1139 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1140 const u8 *tlvs, u32 sizeoftlvs)
1141 {
1142 int retval;
1143 struct sk_buff *skb;
1144 struct lec_priv *priv = netdev_priv(dev);
1145
1146 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1147 return 0; /* not our mac address */
1148
1149 kfree(priv->tlvs); /* NULL if there was no previous association */
1150
1151 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1152 if (priv->tlvs == NULL)
1153 return 0;
1154 priv->sizeoftlvs = sizeoftlvs;
1155
1156 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1157 if (skb == NULL)
1158 return 0;
1159 skb->len = sizeoftlvs;
1160 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1161 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1162 if (retval != 0)
1163 pr_info("lec.c: lane2_associate_req() failed\n");
1164 /*
1165 * If the previous association has changed we must
1166 * somehow notify other LANE entities about the change
1167 */
1168 return 1;
1169 }
1170
1171 /*
1172 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1173 *
1174 */
1175 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1176 const u8 *tlvs, u32 sizeoftlvs)
1177 {
1178 #if 0
1179 int i = 0;
1180 #endif
1181 struct lec_priv *priv = netdev_priv(dev);
1182 #if 0 /*
1183 * Why have the TLVs in LE_ARP entries
1184 * since we do not use them? When you
1185 * uncomment this code, make sure the
1186 * TLVs get freed when entry is killed
1187 */
1188 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1189
1190 if (entry == NULL)
1191 return; /* should not happen */
1192
1193 kfree(entry->tlvs);
1194
1195 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1196 if (entry->tlvs == NULL)
1197 return;
1198 entry->sizeoftlvs = sizeoftlvs;
1199 #endif
1200 #if 0
1201 pr_info("\n");
1202 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1203 while (i < sizeoftlvs)
1204 pr_cont("%02x ", tlvs[i++]);
1205
1206 pr_cont("\n");
1207 #endif
1208
1209 /* tell MPOA about the TLVs we saw */
1210 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1211 priv->lane2_ops->associate_indicator(dev, mac_addr,
1212 tlvs, sizeoftlvs);
1213 }
1214 }
1215
1216 /*
1217 * Here starts what used to lec_arpc.c
1218 *
1219 * lec_arpc.c was added here when making
1220 * lane client modular. October 1997
1221 */
1222
1223 #include <linux/types.h>
1224 #include <linux/timer.h>
1225 #include <linux/param.h>
1226 #include <linux/atomic.h>
1227 #include <linux/inetdevice.h>
1228 #include <net/route.h>
1229
1230 #if 0
1231 #define pr_debug(format, args...)
1232 /*
1233 #define pr_debug printk
1234 */
1235 #endif
1236 #define DEBUG_ARP_TABLE 0
1237
1238 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1239
1240 static void lec_arp_check_expire(struct work_struct *work);
1241 static void lec_arp_expire_arp(unsigned long data);
1242
1243 /*
1244 * Arp table funcs
1245 */
1246
1247 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1248
1249 /*
1250 * Initialization of arp-cache
1251 */
1252 static void lec_arp_init(struct lec_priv *priv)
1253 {
1254 unsigned short i;
1255
1256 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1257 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1258 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1259 INIT_HLIST_HEAD(&priv->lec_no_forward);
1260 INIT_HLIST_HEAD(&priv->mcast_fwds);
1261 spin_lock_init(&priv->lec_arp_lock);
1262 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1263 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1264 }
1265
1266 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1267 {
1268 if (entry->vcc) {
1269 struct atm_vcc *vcc = entry->vcc;
1270 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1271 struct net_device *dev = (struct net_device *)vcc->proto_data;
1272
1273 vcc->pop = vpriv->old_pop;
1274 if (vpriv->xoff)
1275 netif_wake_queue(dev);
1276 kfree(vpriv);
1277 vcc->user_back = NULL;
1278 vcc->push = entry->old_push;
1279 vcc_release_async(vcc, -EPIPE);
1280 entry->vcc = NULL;
1281 }
1282 if (entry->recv_vcc) {
1283 entry->recv_vcc->push = entry->old_recv_push;
1284 vcc_release_async(entry->recv_vcc, -EPIPE);
1285 entry->recv_vcc = NULL;
1286 }
1287 }
1288
1289 /*
1290 * Insert entry to lec_arp_table
1291 * LANE2: Add to the end of the list to satisfy 8.1.13
1292 */
1293 static inline void
1294 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1295 {
1296 struct hlist_head *tmp;
1297
1298 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1299 hlist_add_head(&entry->next, tmp);
1300
1301 pr_debug("Added entry:%pM\n", entry->mac_addr);
1302 }
1303
1304 /*
1305 * Remove entry from lec_arp_table
1306 */
1307 static int
1308 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1309 {
1310 struct hlist_node *node;
1311 struct lec_arp_table *entry;
1312 int i, remove_vcc = 1;
1313
1314 if (!to_remove)
1315 return -1;
1316
1317 hlist_del(&to_remove->next);
1318 del_timer(&to_remove->timer);
1319
1320 /*
1321 * If this is the only MAC connected to this VCC,
1322 * also tear down the VCC
1323 */
1324 if (to_remove->status >= ESI_FLUSH_PENDING) {
1325 /*
1326 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1327 */
1328 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1329 hlist_for_each_entry(entry, node,
1330 &priv->lec_arp_tables[i], next) {
1331 if (memcmp(to_remove->atm_addr,
1332 entry->atm_addr, ATM_ESA_LEN) == 0) {
1333 remove_vcc = 0;
1334 break;
1335 }
1336 }
1337 }
1338 if (remove_vcc)
1339 lec_arp_clear_vccs(to_remove);
1340 }
1341 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1342
1343 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1344 return 0;
1345 }
1346
1347 #if DEBUG_ARP_TABLE
1348 static const char *get_status_string(unsigned char st)
1349 {
1350 switch (st) {
1351 case ESI_UNKNOWN:
1352 return "ESI_UNKNOWN";
1353 case ESI_ARP_PENDING:
1354 return "ESI_ARP_PENDING";
1355 case ESI_VC_PENDING:
1356 return "ESI_VC_PENDING";
1357 case ESI_FLUSH_PENDING:
1358 return "ESI_FLUSH_PENDING";
1359 case ESI_FORWARD_DIRECT:
1360 return "ESI_FORWARD_DIRECT";
1361 }
1362 return "<UNKNOWN>";
1363 }
1364
1365 static void dump_arp_table(struct lec_priv *priv)
1366 {
1367 struct hlist_node *node;
1368 struct lec_arp_table *rulla;
1369 char buf[256];
1370 int i, j, offset;
1371
1372 pr_info("Dump %p:\n", priv);
1373 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1374 hlist_for_each_entry(rulla, node,
1375 &priv->lec_arp_tables[i], next) {
1376 offset = 0;
1377 offset += sprintf(buf, "%d: %p\n", i, rulla);
1378 offset += sprintf(buf + offset, "Mac: %pM",
1379 rulla->mac_addr);
1380 offset += sprintf(buf + offset, " Atm:");
1381 for (j = 0; j < ATM_ESA_LEN; j++) {
1382 offset += sprintf(buf + offset,
1383 "%2.2x ",
1384 rulla->atm_addr[j] & 0xff);
1385 }
1386 offset += sprintf(buf + offset,
1387 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1388 rulla->vcc ? rulla->vcc->vpi : 0,
1389 rulla->vcc ? rulla->vcc->vci : 0,
1390 rulla->recv_vcc ? rulla->recv_vcc->
1391 vpi : 0,
1392 rulla->recv_vcc ? rulla->recv_vcc->
1393 vci : 0, rulla->last_used,
1394 rulla->timestamp, rulla->no_tries);
1395 offset +=
1396 sprintf(buf + offset,
1397 "Flags:%x, Packets_flooded:%x, Status: %s ",
1398 rulla->flags, rulla->packets_flooded,
1399 get_status_string(rulla->status));
1400 pr_info("%s\n", buf);
1401 }
1402 }
1403
1404 if (!hlist_empty(&priv->lec_no_forward))
1405 pr_info("No forward\n");
1406 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1407 offset = 0;
1408 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1409 offset += sprintf(buf + offset, " Atm:");
1410 for (j = 0; j < ATM_ESA_LEN; j++) {
1411 offset += sprintf(buf + offset, "%2.2x ",
1412 rulla->atm_addr[j] & 0xff);
1413 }
1414 offset += sprintf(buf + offset,
1415 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1416 rulla->vcc ? rulla->vcc->vpi : 0,
1417 rulla->vcc ? rulla->vcc->vci : 0,
1418 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1419 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1420 rulla->last_used,
1421 rulla->timestamp, rulla->no_tries);
1422 offset += sprintf(buf + offset,
1423 "Flags:%x, Packets_flooded:%x, Status: %s ",
1424 rulla->flags, rulla->packets_flooded,
1425 get_status_string(rulla->status));
1426 pr_info("%s\n", buf);
1427 }
1428
1429 if (!hlist_empty(&priv->lec_arp_empty_ones))
1430 pr_info("Empty ones\n");
1431 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1432 offset = 0;
1433 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1434 offset += sprintf(buf + offset, " Atm:");
1435 for (j = 0; j < ATM_ESA_LEN; j++) {
1436 offset += sprintf(buf + offset, "%2.2x ",
1437 rulla->atm_addr[j] & 0xff);
1438 }
1439 offset += sprintf(buf + offset,
1440 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1441 rulla->vcc ? rulla->vcc->vpi : 0,
1442 rulla->vcc ? rulla->vcc->vci : 0,
1443 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1444 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1445 rulla->last_used,
1446 rulla->timestamp, rulla->no_tries);
1447 offset += sprintf(buf + offset,
1448 "Flags:%x, Packets_flooded:%x, Status: %s ",
1449 rulla->flags, rulla->packets_flooded,
1450 get_status_string(rulla->status));
1451 pr_info("%s", buf);
1452 }
1453
1454 if (!hlist_empty(&priv->mcast_fwds))
1455 pr_info("Multicast Forward VCCs\n");
1456 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1457 offset = 0;
1458 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1459 offset += sprintf(buf + offset, " Atm:");
1460 for (j = 0; j < ATM_ESA_LEN; j++) {
1461 offset += sprintf(buf + offset, "%2.2x ",
1462 rulla->atm_addr[j] & 0xff);
1463 }
1464 offset += sprintf(buf + offset,
1465 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1466 rulla->vcc ? rulla->vcc->vpi : 0,
1467 rulla->vcc ? rulla->vcc->vci : 0,
1468 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1469 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1470 rulla->last_used,
1471 rulla->timestamp, rulla->no_tries);
1472 offset += sprintf(buf + offset,
1473 "Flags:%x, Packets_flooded:%x, Status: %s ",
1474 rulla->flags, rulla->packets_flooded,
1475 get_status_string(rulla->status));
1476 pr_info("%s\n", buf);
1477 }
1478
1479 }
1480 #else
1481 #define dump_arp_table(priv) do { } while (0)
1482 #endif
1483
1484 /*
1485 * Destruction of arp-cache
1486 */
1487 static void lec_arp_destroy(struct lec_priv *priv)
1488 {
1489 unsigned long flags;
1490 struct hlist_node *node, *next;
1491 struct lec_arp_table *entry;
1492 int i;
1493
1494 cancel_delayed_work_sync(&priv->lec_arp_work);
1495
1496 /*
1497 * Remove all entries
1498 */
1499
1500 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1501 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1502 hlist_for_each_entry_safe(entry, node, next,
1503 &priv->lec_arp_tables[i], next) {
1504 lec_arp_remove(priv, entry);
1505 lec_arp_put(entry);
1506 }
1507 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1508 }
1509
1510 hlist_for_each_entry_safe(entry, node, next,
1511 &priv->lec_arp_empty_ones, next) {
1512 del_timer_sync(&entry->timer);
1513 lec_arp_clear_vccs(entry);
1514 hlist_del(&entry->next);
1515 lec_arp_put(entry);
1516 }
1517 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1518
1519 hlist_for_each_entry_safe(entry, node, next,
1520 &priv->lec_no_forward, next) {
1521 del_timer_sync(&entry->timer);
1522 lec_arp_clear_vccs(entry);
1523 hlist_del(&entry->next);
1524 lec_arp_put(entry);
1525 }
1526 INIT_HLIST_HEAD(&priv->lec_no_forward);
1527
1528 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1529 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1530 lec_arp_clear_vccs(entry);
1531 hlist_del(&entry->next);
1532 lec_arp_put(entry);
1533 }
1534 INIT_HLIST_HEAD(&priv->mcast_fwds);
1535 priv->mcast_vcc = NULL;
1536 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1537 }
1538
1539 /*
1540 * Find entry by mac_address
1541 */
1542 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1543 const unsigned char *mac_addr)
1544 {
1545 struct hlist_node *node;
1546 struct hlist_head *head;
1547 struct lec_arp_table *entry;
1548
1549 pr_debug("%pM\n", mac_addr);
1550
1551 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1552 hlist_for_each_entry(entry, node, head, next) {
1553 if (ether_addr_equal(mac_addr, entry->mac_addr))
1554 return entry;
1555 }
1556 return NULL;
1557 }
1558
1559 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1560 const unsigned char *mac_addr)
1561 {
1562 struct lec_arp_table *to_return;
1563
1564 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1565 if (!to_return) {
1566 pr_info("LEC: Arp entry kmalloc failed\n");
1567 return NULL;
1568 }
1569 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1570 INIT_HLIST_NODE(&to_return->next);
1571 setup_timer(&to_return->timer, lec_arp_expire_arp,
1572 (unsigned long)to_return);
1573 to_return->last_used = jiffies;
1574 to_return->priv = priv;
1575 skb_queue_head_init(&to_return->tx_wait);
1576 atomic_set(&to_return->usage, 1);
1577 return to_return;
1578 }
1579
1580 /* Arp sent timer expired */
1581 static void lec_arp_expire_arp(unsigned long data)
1582 {
1583 struct lec_arp_table *entry;
1584
1585 entry = (struct lec_arp_table *)data;
1586
1587 pr_debug("\n");
1588 if (entry->status == ESI_ARP_PENDING) {
1589 if (entry->no_tries <= entry->priv->max_retry_count) {
1590 if (entry->is_rdesc)
1591 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1592 entry->mac_addr, NULL, NULL);
1593 else
1594 send_to_lecd(entry->priv, l_arp_xmt,
1595 entry->mac_addr, NULL, NULL);
1596 entry->no_tries++;
1597 }
1598 mod_timer(&entry->timer, jiffies + (1 * HZ));
1599 }
1600 }
1601
1602 /* Unknown/unused vcc expire, remove associated entry */
1603 static void lec_arp_expire_vcc(unsigned long data)
1604 {
1605 unsigned long flags;
1606 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1607 struct lec_priv *priv = to_remove->priv;
1608
1609 del_timer(&to_remove->timer);
1610
1611 pr_debug("%p %p: vpi:%d vci:%d\n",
1612 to_remove, priv,
1613 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1614 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1615
1616 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1617 hlist_del(&to_remove->next);
1618 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1619
1620 lec_arp_clear_vccs(to_remove);
1621 lec_arp_put(to_remove);
1622 }
1623
1624 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1625 unsigned long now,
1626 struct lec_priv *priv)
1627 {
1628 unsigned long time_to_check;
1629
1630 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1631 time_to_check = priv->forward_delay_time;
1632 else
1633 time_to_check = priv->aging_time;
1634
1635 pr_debug("About to expire: %lx - %lx > %lx\n",
1636 now, entry->last_used, time_to_check);
1637 if (time_after(now, entry->last_used + time_to_check) &&
1638 !(entry->flags & LEC_PERMANENT_FLAG) &&
1639 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1640 /* Remove entry */
1641 pr_debug("Entry timed out\n");
1642 lec_arp_remove(priv, entry);
1643 lec_arp_put(entry);
1644 } else {
1645 /* Something else */
1646 if ((entry->status == ESI_VC_PENDING ||
1647 entry->status == ESI_ARP_PENDING) &&
1648 time_after_eq(now, entry->timestamp +
1649 priv->max_unknown_frame_time)) {
1650 entry->timestamp = jiffies;
1651 entry->packets_flooded = 0;
1652 if (entry->status == ESI_VC_PENDING)
1653 send_to_lecd(priv, l_svc_setup,
1654 entry->mac_addr,
1655 entry->atm_addr,
1656 NULL);
1657 }
1658 if (entry->status == ESI_FLUSH_PENDING &&
1659 time_after_eq(now, entry->timestamp +
1660 priv->path_switching_delay)) {
1661 lec_arp_hold(entry);
1662 return true;
1663 }
1664 }
1665
1666 return false;
1667 }
1668 /*
1669 * Expire entries.
1670 * 1. Re-set timer
1671 * 2. For each entry, delete entries that have aged past the age limit.
1672 * 3. For each entry, depending on the status of the entry, perform
1673 * the following maintenance.
1674 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1675 * tick_count is above the max_unknown_frame_time, clear
1676 * the tick_count to zero and clear the packets_flooded counter
1677 * to zero. This supports the packet rate limit per address
1678 * while flooding unknowns.
1679 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1680 * than or equal to the path_switching_delay, change the status
1681 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1682 * regardless of the progress of the flush protocol.
1683 */
1684 static void lec_arp_check_expire(struct work_struct *work)
1685 {
1686 unsigned long flags;
1687 struct lec_priv *priv =
1688 container_of(work, struct lec_priv, lec_arp_work.work);
1689 struct hlist_node *node, *next;
1690 struct lec_arp_table *entry;
1691 unsigned long now;
1692 int i;
1693
1694 pr_debug("%p\n", priv);
1695 now = jiffies;
1696 restart:
1697 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1698 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1699 hlist_for_each_entry_safe(entry, node, next,
1700 &priv->lec_arp_tables[i], next) {
1701 if (__lec_arp_check_expire(entry, now, priv)) {
1702 struct sk_buff *skb;
1703 struct atm_vcc *vcc = entry->vcc;
1704
1705 spin_unlock_irqrestore(&priv->lec_arp_lock,
1706 flags);
1707 while ((skb = skb_dequeue(&entry->tx_wait)))
1708 lec_send(vcc, skb);
1709 entry->last_used = jiffies;
1710 entry->status = ESI_FORWARD_DIRECT;
1711 lec_arp_put(entry);
1712
1713 goto restart;
1714 }
1715 }
1716 }
1717 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1718
1719 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1720 }
1721
1722 /*
1723 * Try to find vcc where mac_address is attached.
1724 *
1725 */
1726 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1727 const unsigned char *mac_to_find,
1728 int is_rdesc,
1729 struct lec_arp_table **ret_entry)
1730 {
1731 unsigned long flags;
1732 struct lec_arp_table *entry;
1733 struct atm_vcc *found;
1734
1735 if (mac_to_find[0] & 0x01) {
1736 switch (priv->lane_version) {
1737 case 1:
1738 return priv->mcast_vcc;
1739 case 2: /* LANE2 wants arp for multicast addresses */
1740 if (ether_addr_equal(mac_to_find, bus_mac))
1741 return priv->mcast_vcc;
1742 break;
1743 default:
1744 break;
1745 }
1746 }
1747
1748 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1749 entry = lec_arp_find(priv, mac_to_find);
1750
1751 if (entry) {
1752 if (entry->status == ESI_FORWARD_DIRECT) {
1753 /* Connection Ok */
1754 entry->last_used = jiffies;
1755 lec_arp_hold(entry);
1756 *ret_entry = entry;
1757 found = entry->vcc;
1758 goto out;
1759 }
1760 /*
1761 * If the LE_ARP cache entry is still pending, reset count to 0
1762 * so another LE_ARP request can be made for this frame.
1763 */
1764 if (entry->status == ESI_ARP_PENDING)
1765 entry->no_tries = 0;
1766 /*
1767 * Data direct VC not yet set up, check to see if the unknown
1768 * frame count is greater than the limit. If the limit has
1769 * not been reached, allow the caller to send packet to
1770 * BUS.
1771 */
1772 if (entry->status != ESI_FLUSH_PENDING &&
1773 entry->packets_flooded <
1774 priv->maximum_unknown_frame_count) {
1775 entry->packets_flooded++;
1776 pr_debug("Flooding..\n");
1777 found = priv->mcast_vcc;
1778 goto out;
1779 }
1780 /*
1781 * We got here because entry->status == ESI_FLUSH_PENDING
1782 * or BUS flood limit was reached for an entry which is
1783 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1784 */
1785 lec_arp_hold(entry);
1786 *ret_entry = entry;
1787 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1788 entry->vcc);
1789 found = NULL;
1790 } else {
1791 /* No matching entry was found */
1792 entry = make_entry(priv, mac_to_find);
1793 pr_debug("Making entry\n");
1794 if (!entry) {
1795 found = priv->mcast_vcc;
1796 goto out;
1797 }
1798 lec_arp_add(priv, entry);
1799 /* We want arp-request(s) to be sent */
1800 entry->packets_flooded = 1;
1801 entry->status = ESI_ARP_PENDING;
1802 entry->no_tries = 1;
1803 entry->last_used = entry->timestamp = jiffies;
1804 entry->is_rdesc = is_rdesc;
1805 if (entry->is_rdesc)
1806 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1807 NULL);
1808 else
1809 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1810 entry->timer.expires = jiffies + (1 * HZ);
1811 entry->timer.function = lec_arp_expire_arp;
1812 add_timer(&entry->timer);
1813 found = priv->mcast_vcc;
1814 }
1815
1816 out:
1817 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1818 return found;
1819 }
1820
1821 static int
1822 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1823 unsigned long permanent)
1824 {
1825 unsigned long flags;
1826 struct hlist_node *node, *next;
1827 struct lec_arp_table *entry;
1828 int i;
1829
1830 pr_debug("\n");
1831 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1832 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1833 hlist_for_each_entry_safe(entry, node, next,
1834 &priv->lec_arp_tables[i], next) {
1835 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1836 (permanent ||
1837 !(entry->flags & LEC_PERMANENT_FLAG))) {
1838 lec_arp_remove(priv, entry);
1839 lec_arp_put(entry);
1840 }
1841 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1842 return 0;
1843 }
1844 }
1845 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1846 return -1;
1847 }
1848
1849 /*
1850 * Notifies: Response to arp_request (atm_addr != NULL)
1851 */
1852 static void
1853 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1854 const unsigned char *atm_addr, unsigned long remoteflag,
1855 unsigned int targetless_le_arp)
1856 {
1857 unsigned long flags;
1858 struct hlist_node *node, *next;
1859 struct lec_arp_table *entry, *tmp;
1860 int i;
1861
1862 pr_debug("%smac:%pM\n",
1863 (targetless_le_arp) ? "targetless " : "", mac_addr);
1864
1865 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1866 entry = lec_arp_find(priv, mac_addr);
1867 if (entry == NULL && targetless_le_arp)
1868 goto out; /*
1869 * LANE2: ignore targetless LE_ARPs for which
1870 * we have no entry in the cache. 7.1.30
1871 */
1872 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1873 hlist_for_each_entry_safe(entry, node, next,
1874 &priv->lec_arp_empty_ones, next) {
1875 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1876 hlist_del(&entry->next);
1877 del_timer(&entry->timer);
1878 tmp = lec_arp_find(priv, mac_addr);
1879 if (tmp) {
1880 del_timer(&tmp->timer);
1881 tmp->status = ESI_FORWARD_DIRECT;
1882 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1883 tmp->vcc = entry->vcc;
1884 tmp->old_push = entry->old_push;
1885 tmp->last_used = jiffies;
1886 del_timer(&entry->timer);
1887 lec_arp_put(entry);
1888 entry = tmp;
1889 } else {
1890 entry->status = ESI_FORWARD_DIRECT;
1891 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
1892 entry->last_used = jiffies;
1893 lec_arp_add(priv, entry);
1894 }
1895 if (remoteflag)
1896 entry->flags |= LEC_REMOTE_FLAG;
1897 else
1898 entry->flags &= ~LEC_REMOTE_FLAG;
1899 pr_debug("After update\n");
1900 dump_arp_table(priv);
1901 goto out;
1902 }
1903 }
1904 }
1905
1906 entry = lec_arp_find(priv, mac_addr);
1907 if (!entry) {
1908 entry = make_entry(priv, mac_addr);
1909 if (!entry)
1910 goto out;
1911 entry->status = ESI_UNKNOWN;
1912 lec_arp_add(priv, entry);
1913 /* Temporary, changes before end of function */
1914 }
1915 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1916 del_timer(&entry->timer);
1917 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1918 hlist_for_each_entry(tmp, node,
1919 &priv->lec_arp_tables[i], next) {
1920 if (entry != tmp &&
1921 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1922 /* Vcc to this host exists */
1923 if (tmp->status > ESI_VC_PENDING) {
1924 /*
1925 * ESI_FLUSH_PENDING,
1926 * ESI_FORWARD_DIRECT
1927 */
1928 entry->vcc = tmp->vcc;
1929 entry->old_push = tmp->old_push;
1930 }
1931 entry->status = tmp->status;
1932 break;
1933 }
1934 }
1935 }
1936 if (remoteflag)
1937 entry->flags |= LEC_REMOTE_FLAG;
1938 else
1939 entry->flags &= ~LEC_REMOTE_FLAG;
1940 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1941 entry->status = ESI_VC_PENDING;
1942 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1943 }
1944 pr_debug("After update2\n");
1945 dump_arp_table(priv);
1946 out:
1947 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1948 }
1949
1950 /*
1951 * Notifies: Vcc setup ready
1952 */
1953 static void
1954 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1955 struct atm_vcc *vcc,
1956 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1957 {
1958 unsigned long flags;
1959 struct hlist_node *node;
1960 struct lec_arp_table *entry;
1961 int i, found_entry = 0;
1962
1963 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1964 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1965 if (ioc_data->receive == 2) {
1966 pr_debug("LEC_ARP: Attaching mcast forward\n");
1967 #if 0
1968 entry = lec_arp_find(priv, bus_mac);
1969 if (!entry) {
1970 pr_info("LEC_ARP: Multicast entry not found!\n");
1971 goto out;
1972 }
1973 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1974 entry->recv_vcc = vcc;
1975 entry->old_recv_push = old_push;
1976 #endif
1977 entry = make_entry(priv, bus_mac);
1978 if (entry == NULL)
1979 goto out;
1980 del_timer(&entry->timer);
1981 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1982 entry->recv_vcc = vcc;
1983 entry->old_recv_push = old_push;
1984 hlist_add_head(&entry->next, &priv->mcast_fwds);
1985 goto out;
1986 } else if (ioc_data->receive == 1) {
1987 /*
1988 * Vcc which we don't want to make default vcc,
1989 * attach it anyway.
1990 */
1991 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",
1992 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1993 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1994 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1995 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1996 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1997 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1998 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1999 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2000 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2001 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2002 entry = make_entry(priv, bus_mac);
2003 if (entry == NULL)
2004 goto out;
2005 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2006 memset(entry->mac_addr, 0, ETH_ALEN);
2007 entry->recv_vcc = vcc;
2008 entry->old_recv_push = old_push;
2009 entry->status = ESI_UNKNOWN;
2010 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2011 entry->timer.function = lec_arp_expire_vcc;
2012 hlist_add_head(&entry->next, &priv->lec_no_forward);
2013 add_timer(&entry->timer);
2014 dump_arp_table(priv);
2015 goto out;
2016 }
2017 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",
2018 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2019 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2020 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2021 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2022 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2023 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2024 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2025 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2026 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2027 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2028 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2029 hlist_for_each_entry(entry, node,
2030 &priv->lec_arp_tables[i], next) {
2031 if (memcmp
2032 (ioc_data->atm_addr, entry->atm_addr,
2033 ATM_ESA_LEN) == 0) {
2034 pr_debug("LEC_ARP: Attaching data direct\n");
2035 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2036 entry->vcc ? entry->vcc->vci : 0,
2037 entry->recv_vcc ? entry->recv_vcc->
2038 vci : 0);
2039 found_entry = 1;
2040 del_timer(&entry->timer);
2041 entry->vcc = vcc;
2042 entry->old_push = old_push;
2043 if (entry->status == ESI_VC_PENDING) {
2044 if (priv->maximum_unknown_frame_count
2045 == 0)
2046 entry->status =
2047 ESI_FORWARD_DIRECT;
2048 else {
2049 entry->timestamp = jiffies;
2050 entry->status =
2051 ESI_FLUSH_PENDING;
2052 #if 0
2053 send_to_lecd(priv, l_flush_xmt,
2054 NULL,
2055 entry->atm_addr,
2056 NULL);
2057 #endif
2058 }
2059 } else {
2060 /*
2061 * They were forming a connection
2062 * to us, and we to them. Our
2063 * ATM address is numerically lower
2064 * than theirs, so we make connection
2065 * we formed into default VCC (8.1.11).
2066 * Connection they made gets torn
2067 * down. This might confuse some
2068 * clients. Can be changed if
2069 * someone reports trouble...
2070 */
2071 ;
2072 }
2073 }
2074 }
2075 }
2076 if (found_entry) {
2077 pr_debug("After vcc was added\n");
2078 dump_arp_table(priv);
2079 goto out;
2080 }
2081 /*
2082 * Not found, snatch address from first data packet that arrives
2083 * from this vcc
2084 */
2085 entry = make_entry(priv, bus_mac);
2086 if (!entry)
2087 goto out;
2088 entry->vcc = vcc;
2089 entry->old_push = old_push;
2090 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2091 memset(entry->mac_addr, 0, ETH_ALEN);
2092 entry->status = ESI_UNKNOWN;
2093 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2094 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2095 entry->timer.function = lec_arp_expire_vcc;
2096 add_timer(&entry->timer);
2097 pr_debug("After vcc was added\n");
2098 dump_arp_table(priv);
2099 out:
2100 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2101 }
2102
2103 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2104 {
2105 unsigned long flags;
2106 struct hlist_node *node;
2107 struct lec_arp_table *entry;
2108 int i;
2109
2110 pr_debug("%lx\n", tran_id);
2111 restart:
2112 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2113 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2114 hlist_for_each_entry(entry, node,
2115 &priv->lec_arp_tables[i], next) {
2116 if (entry->flush_tran_id == tran_id &&
2117 entry->status == ESI_FLUSH_PENDING) {
2118 struct sk_buff *skb;
2119 struct atm_vcc *vcc = entry->vcc;
2120
2121 lec_arp_hold(entry);
2122 spin_unlock_irqrestore(&priv->lec_arp_lock,
2123 flags);
2124 while ((skb = skb_dequeue(&entry->tx_wait)))
2125 lec_send(vcc, skb);
2126 entry->last_used = jiffies;
2127 entry->status = ESI_FORWARD_DIRECT;
2128 lec_arp_put(entry);
2129 pr_debug("LEC_ARP: Flushed\n");
2130 goto restart;
2131 }
2132 }
2133 }
2134 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2135 dump_arp_table(priv);
2136 }
2137
2138 static void
2139 lec_set_flush_tran_id(struct lec_priv *priv,
2140 const unsigned char *atm_addr, unsigned long tran_id)
2141 {
2142 unsigned long flags;
2143 struct hlist_node *node;
2144 struct lec_arp_table *entry;
2145 int i;
2146
2147 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2148 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2149 hlist_for_each_entry(entry, node,
2150 &priv->lec_arp_tables[i], next) {
2151 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2152 entry->flush_tran_id = tran_id;
2153 pr_debug("Set flush transaction id to %lx for %p\n",
2154 tran_id, entry);
2155 }
2156 }
2157 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2158 }
2159
2160 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2161 {
2162 unsigned long flags;
2163 unsigned char mac_addr[] = {
2164 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2165 };
2166 struct lec_arp_table *to_add;
2167 struct lec_vcc_priv *vpriv;
2168 int err = 0;
2169
2170 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2171 if (!vpriv)
2172 return -ENOMEM;
2173 vpriv->xoff = 0;
2174 vpriv->old_pop = vcc->pop;
2175 vcc->user_back = vpriv;
2176 vcc->pop = lec_pop;
2177 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2178 to_add = make_entry(priv, mac_addr);
2179 if (!to_add) {
2180 vcc->pop = vpriv->old_pop;
2181 kfree(vpriv);
2182 err = -ENOMEM;
2183 goto out;
2184 }
2185 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2186 to_add->status = ESI_FORWARD_DIRECT;
2187 to_add->flags |= LEC_PERMANENT_FLAG;
2188 to_add->vcc = vcc;
2189 to_add->old_push = vcc->push;
2190 vcc->push = lec_push;
2191 priv->mcast_vcc = vcc;
2192 lec_arp_add(priv, to_add);
2193 out:
2194 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2195 return err;
2196 }
2197
2198 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2199 {
2200 unsigned long flags;
2201 struct hlist_node *node, *next;
2202 struct lec_arp_table *entry;
2203 int i;
2204
2205 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2206 dump_arp_table(priv);
2207
2208 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2209
2210 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2211 hlist_for_each_entry_safe(entry, node, next,
2212 &priv->lec_arp_tables[i], next) {
2213 if (vcc == entry->vcc) {
2214 lec_arp_remove(priv, entry);
2215 lec_arp_put(entry);
2216 if (priv->mcast_vcc == vcc)
2217 priv->mcast_vcc = NULL;
2218 }
2219 }
2220 }
2221
2222 hlist_for_each_entry_safe(entry, node, next,
2223 &priv->lec_arp_empty_ones, next) {
2224 if (entry->vcc == vcc) {
2225 lec_arp_clear_vccs(entry);
2226 del_timer(&entry->timer);
2227 hlist_del(&entry->next);
2228 lec_arp_put(entry);
2229 }
2230 }
2231
2232 hlist_for_each_entry_safe(entry, node, next,
2233 &priv->lec_no_forward, next) {
2234 if (entry->recv_vcc == vcc) {
2235 lec_arp_clear_vccs(entry);
2236 del_timer(&entry->timer);
2237 hlist_del(&entry->next);
2238 lec_arp_put(entry);
2239 }
2240 }
2241
2242 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2243 if (entry->recv_vcc == vcc) {
2244 lec_arp_clear_vccs(entry);
2245 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2246 hlist_del(&entry->next);
2247 lec_arp_put(entry);
2248 }
2249 }
2250
2251 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2252 dump_arp_table(priv);
2253 }
2254
2255 static void
2256 lec_arp_check_empties(struct lec_priv *priv,
2257 struct atm_vcc *vcc, struct sk_buff *skb)
2258 {
2259 unsigned long flags;
2260 struct hlist_node *node, *next;
2261 struct lec_arp_table *entry, *tmp;
2262 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2263 unsigned char *src = hdr->h_source;
2264
2265 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2266 hlist_for_each_entry_safe(entry, node, next,
2267 &priv->lec_arp_empty_ones, next) {
2268 if (vcc == entry->vcc) {
2269 del_timer(&entry->timer);
2270 memcpy(entry->mac_addr, src, ETH_ALEN);
2271 entry->status = ESI_FORWARD_DIRECT;
2272 entry->last_used = jiffies;
2273 /* We might have got an entry */
2274 tmp = lec_arp_find(priv, src);
2275 if (tmp) {
2276 lec_arp_remove(priv, tmp);
2277 lec_arp_put(tmp);
2278 }
2279 hlist_del(&entry->next);
2280 lec_arp_add(priv, entry);
2281 goto out;
2282 }
2283 }
2284 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2285 out:
2286 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2287 }
2288
2289 MODULE_LICENSE("GPL");
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