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IB/ucma: check workqueue allocation before usage
[linux/fpc-iii.git] / net / atm / lec.c
blobcd3b37989057fd0b1c5a8b1f49a224fe96d7ba87
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);
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 rtnl_lock();
414 if (dev_set_mtu(dev, mesg->content.config.mtu))
415 pr_info("%s: change_mtu to %d failed\n",
416 dev->name, mesg->content.config.mtu);
417 rtnl_unlock();
418 priv->is_proxy = mesg->content.config.is_proxy;
419 break;
420 case l_flush_tran_id:
421 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
422 mesg->content.normal.flag);
423 break;
424 case l_set_lecid:
425 priv->lecid =
426 (unsigned short)(0xffff & mesg->content.normal.flag);
427 break;
428 case l_should_bridge:
429 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
430 {
431 pr_debug("%s: bridge zeppelin asks about %pM\n",
432 dev->name, mesg->content.proxy.mac_addr);
433
434 if (br_fdb_test_addr_hook == NULL)
435 break;
436
437 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
438 /* hit from bridge table, send LE_ARP_RESPONSE */
439 struct sk_buff *skb2;
440 struct sock *sk;
441
442 pr_debug("%s: entry found, responding to zeppelin\n",
443 dev->name);
444 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
445 if (skb2 == NULL)
446 break;
447 skb2->len = sizeof(struct atmlec_msg);
448 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
449 atm_force_charge(priv->lecd, skb2->truesize);
450 sk = sk_atm(priv->lecd);
451 skb_queue_tail(&sk->sk_receive_queue, skb2);
452 sk->sk_data_ready(sk);
453 }
454 }
455 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
456 break;
457 default:
458 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
459 dev_kfree_skb(skb);
460 return -EINVAL;
461 }
462 dev_kfree_skb(skb);
463 return 0;
464 }
465
466 static void lec_atm_close(struct atm_vcc *vcc)
467 {
468 struct sk_buff *skb;
469 struct net_device *dev = (struct net_device *)vcc->proto_data;
470 struct lec_priv *priv = netdev_priv(dev);
471
472 priv->lecd = NULL;
473 /* Do something needful? */
474
475 netif_stop_queue(dev);
476 lec_arp_destroy(priv);
477
478 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
479 pr_info("%s closing with messages pending\n", dev->name);
480 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
481 atm_return(vcc, skb->truesize);
482 dev_kfree_skb(skb);
483 }
484
485 pr_info("%s: Shut down!\n", dev->name);
486 module_put(THIS_MODULE);
487 }
488
489 static struct atmdev_ops lecdev_ops = {
490 .close = lec_atm_close,
491 .send = lec_atm_send
492 };
493
494 static struct atm_dev lecatm_dev = {
495 .ops = &lecdev_ops,
496 .type = "lec",
497 .number = 999, /* dummy device number */
498 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
499 };
500
501 /*
502 * LANE2: new argument struct sk_buff *data contains
503 * the LE_ARP based TLVs introduced in the LANE2 spec
504 */
505 static int
506 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
507 const unsigned char *mac_addr, const unsigned char *atm_addr,
508 struct sk_buff *data)
509 {
510 struct sock *sk;
511 struct sk_buff *skb;
512 struct atmlec_msg *mesg;
513
514 if (!priv || !priv->lecd)
515 return -1;
516 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
517 if (!skb)
518 return -1;
519 skb->len = sizeof(struct atmlec_msg);
520 mesg = (struct atmlec_msg *)skb->data;
521 memset(mesg, 0, sizeof(struct atmlec_msg));
522 mesg->type = type;
523 if (data != NULL)
524 mesg->sizeoftlvs = data->len;
525 if (mac_addr)
526 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
527 else
528 mesg->content.normal.targetless_le_arp = 1;
529 if (atm_addr)
530 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
531
532 atm_force_charge(priv->lecd, skb->truesize);
533 sk = sk_atm(priv->lecd);
534 skb_queue_tail(&sk->sk_receive_queue, skb);
535 sk->sk_data_ready(sk);
536
537 if (data != NULL) {
538 pr_debug("about to send %d bytes of data\n", data->len);
539 atm_force_charge(priv->lecd, data->truesize);
540 skb_queue_tail(&sk->sk_receive_queue, data);
541 sk->sk_data_ready(sk);
542 }
543
544 return 0;
545 }
546
547 /* shamelessly stolen from drivers/net/net_init.c */
548 static int lec_change_mtu(struct net_device *dev, int new_mtu)
549 {
550 if ((new_mtu < 68) || (new_mtu > 18190))
551 return -EINVAL;
552 dev->mtu = new_mtu;
553 return 0;
554 }
555
556 static void lec_set_multicast_list(struct net_device *dev)
557 {
558 /*
559 * by default, all multicast frames arrive over the bus.
560 * eventually support selective multicast service
561 */
562 }
563
564 static const struct net_device_ops lec_netdev_ops = {
565 .ndo_open = lec_open,
566 .ndo_stop = lec_close,
567 .ndo_start_xmit = lec_start_xmit,
568 .ndo_change_mtu = lec_change_mtu,
569 .ndo_tx_timeout = lec_tx_timeout,
570 .ndo_set_rx_mode = lec_set_multicast_list,
571 };
572
573 static const unsigned char lec_ctrl_magic[] = {
574 0xff,
575 0x00,
576 0x01,
577 0x01
578 };
579
580 #define LEC_DATA_DIRECT_8023 2
581 #define LEC_DATA_DIRECT_8025 3
582
583 static int lec_is_data_direct(struct atm_vcc *vcc)
584 {
585 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
586 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
587 }
588
589 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
590 {
591 unsigned long flags;
592 struct net_device *dev = (struct net_device *)vcc->proto_data;
593 struct lec_priv *priv = netdev_priv(dev);
594
595 #if DUMP_PACKETS > 0
596 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
597 dev->name, vcc->vpi, vcc->vci);
598 #endif
599 if (!skb) {
600 pr_debug("%s: null skb\n", dev->name);
601 lec_vcc_close(priv, vcc);
602 return;
603 }
604 #if DUMP_PACKETS >= 2
605 #define MAX_SKB_DUMP 99
606 #elif DUMP_PACKETS >= 1
607 #define MAX_SKB_DUMP 30
608 #endif
609 #if DUMP_PACKETS > 0
610 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
611 dev->name, skb->len, priv->lecid);
612 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
613 skb->data, min(MAX_SKB_DUMP, skb->len), true);
614 #endif /* DUMP_PACKETS > 0 */
615 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
616 /* Control frame, to daemon */
617 struct sock *sk = sk_atm(vcc);
618
619 pr_debug("%s: To daemon\n", dev->name);
620 skb_queue_tail(&sk->sk_receive_queue, skb);
621 sk->sk_data_ready(sk);
622 } else { /* Data frame, queue to protocol handlers */
623 struct lec_arp_table *entry;
624 unsigned char *src, *dst;
625
626 atm_return(vcc, skb->truesize);
627 if (*(__be16 *) skb->data == htons(priv->lecid) ||
628 !priv->lecd || !(dev->flags & IFF_UP)) {
629 /*
630 * Probably looping back, or if lecd is missing,
631 * lecd has gone down
632 */
633 pr_debug("Ignoring frame...\n");
634 dev_kfree_skb(skb);
635 return;
636 }
637 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
638
639 /*
640 * If this is a Data Direct VCC, and the VCC does not match
641 * the LE_ARP cache entry, delete the LE_ARP cache entry.
642 */
643 spin_lock_irqsave(&priv->lec_arp_lock, flags);
644 if (lec_is_data_direct(vcc)) {
645 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
646 entry = lec_arp_find(priv, src);
647 if (entry && entry->vcc != vcc) {
648 lec_arp_remove(priv, entry);
649 lec_arp_put(entry);
650 }
651 }
652 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
653
654 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
655 !priv->is_proxy && /* Proxy wants all the packets */
656 memcmp(dst, dev->dev_addr, dev->addr_len)) {
657 dev_kfree_skb(skb);
658 return;
659 }
660 if (!hlist_empty(&priv->lec_arp_empty_ones))
661 lec_arp_check_empties(priv, vcc, skb);
662 skb_pull(skb, 2); /* skip lec_id */
663 skb->protocol = eth_type_trans(skb, dev);
664 dev->stats.rx_packets++;
665 dev->stats.rx_bytes += skb->len;
666 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
667 netif_rx(skb);
668 }
669 }
670
671 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
672 {
673 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
674 struct net_device *dev = skb->dev;
675
676 if (vpriv == NULL) {
677 pr_info("vpriv = NULL!?!?!?\n");
678 return;
679 }
680
681 vpriv->old_pop(vcc, skb);
682
683 if (vpriv->xoff && atm_may_send(vcc, 0)) {
684 vpriv->xoff = 0;
685 if (netif_running(dev) && netif_queue_stopped(dev))
686 netif_wake_queue(dev);
687 }
688 }
689
690 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
691 {
692 struct lec_vcc_priv *vpriv;
693 int bytes_left;
694 struct atmlec_ioc ioc_data;
695
696 /* Lecd must be up in this case */
697 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
698 if (bytes_left != 0)
699 pr_info("copy from user failed for %d bytes\n", bytes_left);
700 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
701 !dev_lec[ioc_data.dev_num])
702 return -EINVAL;
703 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
704 if (!vpriv)
705 return -ENOMEM;
706 vpriv->xoff = 0;
707 vpriv->old_pop = vcc->pop;
708 vcc->user_back = vpriv;
709 vcc->pop = lec_pop;
710 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
711 &ioc_data, vcc, vcc->push);
712 vcc->proto_data = dev_lec[ioc_data.dev_num];
713 vcc->push = lec_push;
714 return 0;
715 }
716
717 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
718 {
719 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
720 return -EINVAL;
721 vcc->proto_data = dev_lec[arg];
722 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
723 }
724
725 /* Initialize device. */
726 static int lecd_attach(struct atm_vcc *vcc, int arg)
727 {
728 int i;
729 struct lec_priv *priv;
730
731 if (arg < 0)
732 i = 0;
733 else
734 i = arg;
735 if (arg >= MAX_LEC_ITF)
736 return -EINVAL;
737 if (!dev_lec[i]) {
738 int size;
739
740 size = sizeof(struct lec_priv);
741 dev_lec[i] = alloc_etherdev(size);
742 if (!dev_lec[i])
743 return -ENOMEM;
744 dev_lec[i]->netdev_ops = &lec_netdev_ops;
745 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
746 if (register_netdev(dev_lec[i])) {
747 free_netdev(dev_lec[i]);
748 return -EINVAL;
749 }
750
751 priv = netdev_priv(dev_lec[i]);
752 } else {
753 priv = netdev_priv(dev_lec[i]);
754 if (priv->lecd)
755 return -EADDRINUSE;
756 }
757 lec_arp_init(priv);
758 priv->itfnum = i; /* LANE2 addition */
759 priv->lecd = vcc;
760 vcc->dev = &lecatm_dev;
761 vcc_insert_socket(sk_atm(vcc));
762
763 vcc->proto_data = dev_lec[i];
764 set_bit(ATM_VF_META, &vcc->flags);
765 set_bit(ATM_VF_READY, &vcc->flags);
766
767 /* Set default values to these variables */
768 priv->maximum_unknown_frame_count = 1;
769 priv->max_unknown_frame_time = (1 * HZ);
770 priv->vcc_timeout_period = (1200 * HZ);
771 priv->max_retry_count = 1;
772 priv->aging_time = (300 * HZ);
773 priv->forward_delay_time = (15 * HZ);
774 priv->topology_change = 0;
775 priv->arp_response_time = (1 * HZ);
776 priv->flush_timeout = (4 * HZ);
777 priv->path_switching_delay = (6 * HZ);
778
779 if (dev_lec[i]->flags & IFF_UP)
780 netif_start_queue(dev_lec[i]);
781 __module_get(THIS_MODULE);
782 return i;
783 }
784
785 #ifdef CONFIG_PROC_FS
786 static const char *lec_arp_get_status_string(unsigned char status)
787 {
788 static const char *const lec_arp_status_string[] = {
789 "ESI_UNKNOWN ",
790 "ESI_ARP_PENDING ",
791 "ESI_VC_PENDING ",
792 "<Undefined> ",
793 "ESI_FLUSH_PENDING ",
794 "ESI_FORWARD_DIRECT"
795 };
796
797 if (status > ESI_FORWARD_DIRECT)
798 status = 3; /* ESI_UNDEFINED */
799 return lec_arp_status_string[status];
800 }
801
802 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
803 {
804 int i;
805
806 for (i = 0; i < ETH_ALEN; i++)
807 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
808 seq_printf(seq, " ");
809 for (i = 0; i < ATM_ESA_LEN; i++)
810 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
811 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
812 entry->flags & 0xffff);
813 if (entry->vcc)
814 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
815 else
816 seq_printf(seq, " ");
817 if (entry->recv_vcc) {
818 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
819 entry->recv_vcc->vci);
820 }
821 seq_putc(seq, '\n');
822 }
823
824 struct lec_state {
825 unsigned long flags;
826 struct lec_priv *locked;
827 struct hlist_node *node;
828 struct net_device *dev;
829 int itf;
830 int arp_table;
831 int misc_table;
832 };
833
834 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
835 loff_t *l)
836 {
837 struct hlist_node *e = state->node;
838
839 if (!e)
840 e = tbl->first;
841 if (e == SEQ_START_TOKEN) {
842 e = tbl->first;
843 --*l;
844 }
845
846 for (; e; e = e->next) {
847 if (--*l < 0)
848 break;
849 }
850 state->node = e;
851
852 return (*l < 0) ? state : NULL;
853 }
854
855 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
856 struct lec_priv *priv)
857 {
858 void *v = NULL;
859 int p;
860
861 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
862 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
863 if (v)
864 break;
865 }
866 state->arp_table = p;
867 return v;
868 }
869
870 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
871 struct lec_priv *priv)
872 {
873 struct hlist_head *lec_misc_tables[] = {
874 &priv->lec_arp_empty_ones,
875 &priv->lec_no_forward,
876 &priv->mcast_fwds
877 };
878 void *v = NULL;
879 int q;
880
881 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
882 v = lec_tbl_walk(state, lec_misc_tables[q], l);
883 if (v)
884 break;
885 }
886 state->misc_table = q;
887 return v;
888 }
889
890 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
891 struct lec_priv *priv)
892 {
893 if (!state->locked) {
894 state->locked = priv;
895 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
896 }
897 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
898 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
899 state->locked = NULL;
900 /* Partial state reset for the next time we get called */
901 state->arp_table = state->misc_table = 0;
902 }
903 return state->locked;
904 }
905
906 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
907 {
908 struct net_device *dev;
909 void *v;
910
911 dev = state->dev ? state->dev : dev_lec[state->itf];
912 v = (dev && netdev_priv(dev)) ?
913 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
914 if (!v && dev) {
915 dev_put(dev);
916 /* Partial state reset for the next time we get called */
917 dev = NULL;
918 }
919 state->dev = dev;
920 return v;
921 }
922
923 static void *lec_get_idx(struct lec_state *state, loff_t l)
924 {
925 void *v = NULL;
926
927 for (; state->itf < MAX_LEC_ITF; state->itf++) {
928 v = lec_itf_walk(state, &l);
929 if (v)
930 break;
931 }
932 return v;
933 }
934
935 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
936 {
937 struct lec_state *state = seq->private;
938
939 state->itf = 0;
940 state->dev = NULL;
941 state->locked = NULL;
942 state->arp_table = 0;
943 state->misc_table = 0;
944 state->node = SEQ_START_TOKEN;
945
946 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
947 }
948
949 static void lec_seq_stop(struct seq_file *seq, void *v)
950 {
951 struct lec_state *state = seq->private;
952
953 if (state->dev) {
954 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
955 state->flags);
956 dev_put(state->dev);
957 }
958 }
959
960 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
961 {
962 struct lec_state *state = seq->private;
963
964 v = lec_get_idx(state, 1);
965 *pos += !!PTR_ERR(v);
966 return v;
967 }
968
969 static int lec_seq_show(struct seq_file *seq, void *v)
970 {
971 static const char lec_banner[] =
972 "Itf MAC ATM destination"
973 " Status Flags "
974 "VPI/VCI Recv VPI/VCI\n";
975
976 if (v == SEQ_START_TOKEN)
977 seq_puts(seq, lec_banner);
978 else {
979 struct lec_state *state = seq->private;
980 struct net_device *dev = state->dev;
981 struct lec_arp_table *entry = hlist_entry(state->node,
982 struct lec_arp_table,
983 next);
984
985 seq_printf(seq, "%s ", dev->name);
986 lec_info(seq, entry);
987 }
988 return 0;
989 }
990
991 static const struct seq_operations lec_seq_ops = {
992 .start = lec_seq_start,
993 .next = lec_seq_next,
994 .stop = lec_seq_stop,
995 .show = lec_seq_show,
996 };
997
998 static int lec_seq_open(struct inode *inode, struct file *file)
999 {
1000 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1001 }
1002
1003 static const struct file_operations lec_seq_fops = {
1004 .owner = THIS_MODULE,
1005 .open = lec_seq_open,
1006 .read = seq_read,
1007 .llseek = seq_lseek,
1008 .release = seq_release_private,
1009 };
1010 #endif
1011
1012 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1013 {
1014 struct atm_vcc *vcc = ATM_SD(sock);
1015 int err = 0;
1016
1017 switch (cmd) {
1018 case ATMLEC_CTRL:
1019 case ATMLEC_MCAST:
1020 case ATMLEC_DATA:
1021 if (!capable(CAP_NET_ADMIN))
1022 return -EPERM;
1023 break;
1024 default:
1025 return -ENOIOCTLCMD;
1026 }
1027
1028 switch (cmd) {
1029 case ATMLEC_CTRL:
1030 err = lecd_attach(vcc, (int)arg);
1031 if (err >= 0)
1032 sock->state = SS_CONNECTED;
1033 break;
1034 case ATMLEC_MCAST:
1035 err = lec_mcast_attach(vcc, (int)arg);
1036 break;
1037 case ATMLEC_DATA:
1038 err = lec_vcc_attach(vcc, (void __user *)arg);
1039 break;
1040 }
1041
1042 return err;
1043 }
1044
1045 static struct atm_ioctl lane_ioctl_ops = {
1046 .owner = THIS_MODULE,
1047 .ioctl = lane_ioctl,
1048 };
1049
1050 static int __init lane_module_init(void)
1051 {
1052 #ifdef CONFIG_PROC_FS
1053 struct proc_dir_entry *p;
1054
1055 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1056 if (!p) {
1057 pr_err("Unable to initialize /proc/net/atm/lec\n");
1058 return -ENOMEM;
1059 }
1060 #endif
1061
1062 register_atm_ioctl(&lane_ioctl_ops);
1063 pr_info("lec.c: initialized\n");
1064 return 0;
1065 }
1066
1067 static void __exit lane_module_cleanup(void)
1068 {
1069 int i;
1070
1071 remove_proc_entry("lec", atm_proc_root);
1072
1073 deregister_atm_ioctl(&lane_ioctl_ops);
1074
1075 for (i = 0; i < MAX_LEC_ITF; i++) {
1076 if (dev_lec[i] != NULL) {
1077 unregister_netdev(dev_lec[i]);
1078 free_netdev(dev_lec[i]);
1079 dev_lec[i] = NULL;
1080 }
1081 }
1082 }
1083
1084 module_init(lane_module_init);
1085 module_exit(lane_module_cleanup);
1086
1087 /*
1088 * LANE2: 3.1.3, LE_RESOLVE.request
1089 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1090 * If sizeoftlvs == NULL the default TLVs associated with with this
1091 * lec will be used.
1092 * If dst_mac == NULL, targetless LE_ARP will be sent
1093 */
1094 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1095 u8 **tlvs, u32 *sizeoftlvs)
1096 {
1097 unsigned long flags;
1098 struct lec_priv *priv = netdev_priv(dev);
1099 struct lec_arp_table *table;
1100 struct sk_buff *skb;
1101 int retval;
1102
1103 if (force == 0) {
1104 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1105 table = lec_arp_find(priv, dst_mac);
1106 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1107 if (table == NULL)
1108 return -1;
1109
1110 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1111 if (*tlvs == NULL)
1112 return -1;
1113
1114 *sizeoftlvs = table->sizeoftlvs;
1115
1116 return 0;
1117 }
1118
1119 if (sizeoftlvs == NULL)
1120 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1121
1122 else {
1123 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1124 if (skb == NULL)
1125 return -1;
1126 skb->len = *sizeoftlvs;
1127 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1128 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1129 }
1130 return retval;
1131 }
1132
1133 /*
1134 * LANE2: 3.1.4, LE_ASSOCIATE.request
1135 * Associate the *tlvs with the *lan_dst address.
1136 * Will overwrite any previous association
1137 * Returns 1 for success, 0 for failure (out of memory)
1138 *
1139 */
1140 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1141 const u8 *tlvs, u32 sizeoftlvs)
1142 {
1143 int retval;
1144 struct sk_buff *skb;
1145 struct lec_priv *priv = netdev_priv(dev);
1146
1147 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1148 return 0; /* not our mac address */
1149
1150 kfree(priv->tlvs); /* NULL if there was no previous association */
1151
1152 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1153 if (priv->tlvs == NULL)
1154 return 0;
1155 priv->sizeoftlvs = sizeoftlvs;
1156
1157 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1158 if (skb == NULL)
1159 return 0;
1160 skb->len = sizeoftlvs;
1161 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1162 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1163 if (retval != 0)
1164 pr_info("lec.c: lane2_associate_req() failed\n");
1165 /*
1166 * If the previous association has changed we must
1167 * somehow notify other LANE entities about the change
1168 */
1169 return 1;
1170 }
1171
1172 /*
1173 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1174 *
1175 */
1176 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1177 const u8 *tlvs, u32 sizeoftlvs)
1178 {
1179 #if 0
1180 int i = 0;
1181 #endif
1182 struct lec_priv *priv = netdev_priv(dev);
1183 #if 0 /*
1184 * Why have the TLVs in LE_ARP entries
1185 * since we do not use them? When you
1186 * uncomment this code, make sure the
1187 * TLVs get freed when entry is killed
1188 */
1189 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1190
1191 if (entry == NULL)
1192 return; /* should not happen */
1193
1194 kfree(entry->tlvs);
1195
1196 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1197 if (entry->tlvs == NULL)
1198 return;
1199 entry->sizeoftlvs = sizeoftlvs;
1200 #endif
1201 #if 0
1202 pr_info("\n");
1203 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1204 while (i < sizeoftlvs)
1205 pr_cont("%02x ", tlvs[i++]);
1206
1207 pr_cont("\n");
1208 #endif
1209
1210 /* tell MPOA about the TLVs we saw */
1211 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1212 priv->lane2_ops->associate_indicator(dev, mac_addr,
1213 tlvs, sizeoftlvs);
1214 }
1215 }
1216
1217 /*
1218 * Here starts what used to lec_arpc.c
1219 *
1220 * lec_arpc.c was added here when making
1221 * lane client modular. October 1997
1222 */
1223
1224 #include <linux/types.h>
1225 #include <linux/timer.h>
1226 #include <linux/param.h>
1227 #include <linux/atomic.h>
1228 #include <linux/inetdevice.h>
1229 #include <net/route.h>
1230
1231 #if 0
1232 #define pr_debug(format, args...)
1233 /*
1234 #define pr_debug printk
1235 */
1236 #endif
1237 #define DEBUG_ARP_TABLE 0
1238
1239 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1240
1241 static void lec_arp_check_expire(struct work_struct *work);
1242 static void lec_arp_expire_arp(unsigned long data);
1243
1244 /*
1245 * Arp table funcs
1246 */
1247
1248 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1249
1250 /*
1251 * Initialization of arp-cache
1252 */
1253 static void lec_arp_init(struct lec_priv *priv)
1254 {
1255 unsigned short i;
1256
1257 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1258 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1259 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1260 INIT_HLIST_HEAD(&priv->lec_no_forward);
1261 INIT_HLIST_HEAD(&priv->mcast_fwds);
1262 spin_lock_init(&priv->lec_arp_lock);
1263 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1264 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1265 }
1266
1267 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1268 {
1269 if (entry->vcc) {
1270 struct atm_vcc *vcc = entry->vcc;
1271 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1272 struct net_device *dev = (struct net_device *)vcc->proto_data;
1273
1274 vcc->pop = vpriv->old_pop;
1275 if (vpriv->xoff)
1276 netif_wake_queue(dev);
1277 kfree(vpriv);
1278 vcc->user_back = NULL;
1279 vcc->push = entry->old_push;
1280 vcc_release_async(vcc, -EPIPE);
1281 entry->vcc = NULL;
1282 }
1283 if (entry->recv_vcc) {
1284 entry->recv_vcc->push = entry->old_recv_push;
1285 vcc_release_async(entry->recv_vcc, -EPIPE);
1286 entry->recv_vcc = NULL;
1287 }
1288 }
1289
1290 /*
1291 * Insert entry to lec_arp_table
1292 * LANE2: Add to the end of the list to satisfy 8.1.13
1293 */
1294 static inline void
1295 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1296 {
1297 struct hlist_head *tmp;
1298
1299 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1300 hlist_add_head(&entry->next, tmp);
1301
1302 pr_debug("Added entry:%pM\n", entry->mac_addr);
1303 }
1304
1305 /*
1306 * Remove entry from lec_arp_table
1307 */
1308 static int
1309 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1310 {
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,
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 lec_arp_table *rulla;
1368 char buf[256];
1369 int i, j, offset;
1370
1371 pr_info("Dump %p:\n", priv);
1372 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1373 hlist_for_each_entry(rulla,
1374 &priv->lec_arp_tables[i], next) {
1375 offset = 0;
1376 offset += sprintf(buf, "%d: %p\n", i, rulla);
1377 offset += sprintf(buf + offset, "Mac: %pM",
1378 rulla->mac_addr);
1379 offset += sprintf(buf + offset, " Atm:");
1380 for (j = 0; j < ATM_ESA_LEN; j++) {
1381 offset += sprintf(buf + offset,
1382 "%2.2x ",
1383 rulla->atm_addr[j] & 0xff);
1384 }
1385 offset += sprintf(buf + offset,
1386 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1387 rulla->vcc ? rulla->vcc->vpi : 0,
1388 rulla->vcc ? rulla->vcc->vci : 0,
1389 rulla->recv_vcc ? rulla->recv_vcc->
1390 vpi : 0,
1391 rulla->recv_vcc ? rulla->recv_vcc->
1392 vci : 0, rulla->last_used,
1393 rulla->timestamp, rulla->no_tries);
1394 offset +=
1395 sprintf(buf + offset,
1396 "Flags:%x, Packets_flooded:%x, Status: %s ",
1397 rulla->flags, rulla->packets_flooded,
1398 get_status_string(rulla->status));
1399 pr_info("%s\n", buf);
1400 }
1401 }
1402
1403 if (!hlist_empty(&priv->lec_no_forward))
1404 pr_info("No forward\n");
1405 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1406 offset = 0;
1407 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1408 offset += sprintf(buf + offset, " Atm:");
1409 for (j = 0; j < ATM_ESA_LEN; j++) {
1410 offset += sprintf(buf + offset, "%2.2x ",
1411 rulla->atm_addr[j] & 0xff);
1412 }
1413 offset += sprintf(buf + offset,
1414 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1415 rulla->vcc ? rulla->vcc->vpi : 0,
1416 rulla->vcc ? rulla->vcc->vci : 0,
1417 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1418 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1419 rulla->last_used,
1420 rulla->timestamp, rulla->no_tries);
1421 offset += sprintf(buf + offset,
1422 "Flags:%x, Packets_flooded:%x, Status: %s ",
1423 rulla->flags, rulla->packets_flooded,
1424 get_status_string(rulla->status));
1425 pr_info("%s\n", buf);
1426 }
1427
1428 if (!hlist_empty(&priv->lec_arp_empty_ones))
1429 pr_info("Empty ones\n");
1430 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1431 offset = 0;
1432 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1433 offset += sprintf(buf + offset, " Atm:");
1434 for (j = 0; j < ATM_ESA_LEN; j++) {
1435 offset += sprintf(buf + offset, "%2.2x ",
1436 rulla->atm_addr[j] & 0xff);
1437 }
1438 offset += sprintf(buf + offset,
1439 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1440 rulla->vcc ? rulla->vcc->vpi : 0,
1441 rulla->vcc ? rulla->vcc->vci : 0,
1442 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1443 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1444 rulla->last_used,
1445 rulla->timestamp, rulla->no_tries);
1446 offset += sprintf(buf + offset,
1447 "Flags:%x, Packets_flooded:%x, Status: %s ",
1448 rulla->flags, rulla->packets_flooded,
1449 get_status_string(rulla->status));
1450 pr_info("%s", buf);
1451 }
1452
1453 if (!hlist_empty(&priv->mcast_fwds))
1454 pr_info("Multicast Forward VCCs\n");
1455 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1456 offset = 0;
1457 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1458 offset += sprintf(buf + offset, " Atm:");
1459 for (j = 0; j < ATM_ESA_LEN; j++) {
1460 offset += sprintf(buf + offset, "%2.2x ",
1461 rulla->atm_addr[j] & 0xff);
1462 }
1463 offset += sprintf(buf + offset,
1464 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1465 rulla->vcc ? rulla->vcc->vpi : 0,
1466 rulla->vcc ? rulla->vcc->vci : 0,
1467 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1468 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1469 rulla->last_used,
1470 rulla->timestamp, rulla->no_tries);
1471 offset += sprintf(buf + offset,
1472 "Flags:%x, Packets_flooded:%x, Status: %s ",
1473 rulla->flags, rulla->packets_flooded,
1474 get_status_string(rulla->status));
1475 pr_info("%s\n", buf);
1476 }
1477
1478 }
1479 #else
1480 #define dump_arp_table(priv) do { } while (0)
1481 #endif
1482
1483 /*
1484 * Destruction of arp-cache
1485 */
1486 static void lec_arp_destroy(struct lec_priv *priv)
1487 {
1488 unsigned long flags;
1489 struct hlist_node *next;
1490 struct lec_arp_table *entry;
1491 int i;
1492
1493 cancel_delayed_work_sync(&priv->lec_arp_work);
1494
1495 /*
1496 * Remove all entries
1497 */
1498
1499 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1500 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1501 hlist_for_each_entry_safe(entry, next,
1502 &priv->lec_arp_tables[i], next) {
1503 lec_arp_remove(priv, entry);
1504 lec_arp_put(entry);
1505 }
1506 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1507 }
1508
1509 hlist_for_each_entry_safe(entry, next,
1510 &priv->lec_arp_empty_ones, next) {
1511 del_timer_sync(&entry->timer);
1512 lec_arp_clear_vccs(entry);
1513 hlist_del(&entry->next);
1514 lec_arp_put(entry);
1515 }
1516 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1517
1518 hlist_for_each_entry_safe(entry, next,
1519 &priv->lec_no_forward, next) {
1520 del_timer_sync(&entry->timer);
1521 lec_arp_clear_vccs(entry);
1522 hlist_del(&entry->next);
1523 lec_arp_put(entry);
1524 }
1525 INIT_HLIST_HEAD(&priv->lec_no_forward);
1526
1527 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1528 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1529 lec_arp_clear_vccs(entry);
1530 hlist_del(&entry->next);
1531 lec_arp_put(entry);
1532 }
1533 INIT_HLIST_HEAD(&priv->mcast_fwds);
1534 priv->mcast_vcc = NULL;
1535 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1536 }
1537
1538 /*
1539 * Find entry by mac_address
1540 */
1541 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1542 const unsigned char *mac_addr)
1543 {
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, 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 ether_addr_copy(to_return->mac_addr, mac_addr);
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 = 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 *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, 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 *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, 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 *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, 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 ether_addr_copy(entry->mac_addr,
1890 mac_addr);
1891 entry->last_used = jiffies;
1892 lec_arp_add(priv, entry);
1893 }
1894 if (remoteflag)
1895 entry->flags |= LEC_REMOTE_FLAG;
1896 else
1897 entry->flags &= ~LEC_REMOTE_FLAG;
1898 pr_debug("After update\n");
1899 dump_arp_table(priv);
1900 goto out;
1901 }
1902 }
1903 }
1904
1905 entry = lec_arp_find(priv, mac_addr);
1906 if (!entry) {
1907 entry = make_entry(priv, mac_addr);
1908 if (!entry)
1909 goto out;
1910 entry->status = ESI_UNKNOWN;
1911 lec_arp_add(priv, entry);
1912 /* Temporary, changes before end of function */
1913 }
1914 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1915 del_timer(&entry->timer);
1916 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1917 hlist_for_each_entry(tmp,
1918 &priv->lec_arp_tables[i], next) {
1919 if (entry != tmp &&
1920 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1921 /* Vcc to this host exists */
1922 if (tmp->status > ESI_VC_PENDING) {
1923 /*
1924 * ESI_FLUSH_PENDING,
1925 * ESI_FORWARD_DIRECT
1926 */
1927 entry->vcc = tmp->vcc;
1928 entry->old_push = tmp->old_push;
1929 }
1930 entry->status = tmp->status;
1931 break;
1932 }
1933 }
1934 }
1935 if (remoteflag)
1936 entry->flags |= LEC_REMOTE_FLAG;
1937 else
1938 entry->flags &= ~LEC_REMOTE_FLAG;
1939 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1940 entry->status = ESI_VC_PENDING;
1941 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1942 }
1943 pr_debug("After update2\n");
1944 dump_arp_table(priv);
1945 out:
1946 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1947 }
1948
1949 /*
1950 * Notifies: Vcc setup ready
1951 */
1952 static void
1953 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1954 struct atm_vcc *vcc,
1955 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1956 {
1957 unsigned long flags;
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 eth_zero_addr(entry->mac_addr);
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,
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 eth_zero_addr(entry->mac_addr);
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 lec_arp_table *entry;
2105 int i;
2106
2107 pr_debug("%lx\n", tran_id);
2108 restart:
2109 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2110 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2111 hlist_for_each_entry(entry,
2112 &priv->lec_arp_tables[i], next) {
2113 if (entry->flush_tran_id == tran_id &&
2114 entry->status == ESI_FLUSH_PENDING) {
2115 struct sk_buff *skb;
2116 struct atm_vcc *vcc = entry->vcc;
2117
2118 lec_arp_hold(entry);
2119 spin_unlock_irqrestore(&priv->lec_arp_lock,
2120 flags);
2121 while ((skb = skb_dequeue(&entry->tx_wait)))
2122 lec_send(vcc, skb);
2123 entry->last_used = jiffies;
2124 entry->status = ESI_FORWARD_DIRECT;
2125 lec_arp_put(entry);
2126 pr_debug("LEC_ARP: Flushed\n");
2127 goto restart;
2128 }
2129 }
2130 }
2131 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2132 dump_arp_table(priv);
2133 }
2134
2135 static void
2136 lec_set_flush_tran_id(struct lec_priv *priv,
2137 const unsigned char *atm_addr, unsigned long tran_id)
2138 {
2139 unsigned long flags;
2140 struct lec_arp_table *entry;
2141 int i;
2142
2143 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2144 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2145 hlist_for_each_entry(entry,
2146 &priv->lec_arp_tables[i], next) {
2147 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2148 entry->flush_tran_id = tran_id;
2149 pr_debug("Set flush transaction id to %lx for %p\n",
2150 tran_id, entry);
2151 }
2152 }
2153 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2154 }
2155
2156 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2157 {
2158 unsigned long flags;
2159 unsigned char mac_addr[] = {
2160 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2161 };
2162 struct lec_arp_table *to_add;
2163 struct lec_vcc_priv *vpriv;
2164 int err = 0;
2165
2166 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2167 if (!vpriv)
2168 return -ENOMEM;
2169 vpriv->xoff = 0;
2170 vpriv->old_pop = vcc->pop;
2171 vcc->user_back = vpriv;
2172 vcc->pop = lec_pop;
2173 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2174 to_add = make_entry(priv, mac_addr);
2175 if (!to_add) {
2176 vcc->pop = vpriv->old_pop;
2177 kfree(vpriv);
2178 err = -ENOMEM;
2179 goto out;
2180 }
2181 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2182 to_add->status = ESI_FORWARD_DIRECT;
2183 to_add->flags |= LEC_PERMANENT_FLAG;
2184 to_add->vcc = vcc;
2185 to_add->old_push = vcc->push;
2186 vcc->push = lec_push;
2187 priv->mcast_vcc = vcc;
2188 lec_arp_add(priv, to_add);
2189 out:
2190 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2191 return err;
2192 }
2193
2194 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2195 {
2196 unsigned long flags;
2197 struct hlist_node *next;
2198 struct lec_arp_table *entry;
2199 int i;
2200
2201 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2202 dump_arp_table(priv);
2203
2204 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2205
2206 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2207 hlist_for_each_entry_safe(entry, next,
2208 &priv->lec_arp_tables[i], next) {
2209 if (vcc == entry->vcc) {
2210 lec_arp_remove(priv, entry);
2211 lec_arp_put(entry);
2212 if (priv->mcast_vcc == vcc)
2213 priv->mcast_vcc = NULL;
2214 }
2215 }
2216 }
2217
2218 hlist_for_each_entry_safe(entry, next,
2219 &priv->lec_arp_empty_ones, next) {
2220 if (entry->vcc == vcc) {
2221 lec_arp_clear_vccs(entry);
2222 del_timer(&entry->timer);
2223 hlist_del(&entry->next);
2224 lec_arp_put(entry);
2225 }
2226 }
2227
2228 hlist_for_each_entry_safe(entry, next,
2229 &priv->lec_no_forward, next) {
2230 if (entry->recv_vcc == vcc) {
2231 lec_arp_clear_vccs(entry);
2232 del_timer(&entry->timer);
2233 hlist_del(&entry->next);
2234 lec_arp_put(entry);
2235 }
2236 }
2237
2238 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2239 if (entry->recv_vcc == vcc) {
2240 lec_arp_clear_vccs(entry);
2241 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2242 hlist_del(&entry->next);
2243 lec_arp_put(entry);
2244 }
2245 }
2246
2247 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2248 dump_arp_table(priv);
2249 }
2250
2251 static void
2252 lec_arp_check_empties(struct lec_priv *priv,
2253 struct atm_vcc *vcc, struct sk_buff *skb)
2254 {
2255 unsigned long flags;
2256 struct hlist_node *next;
2257 struct lec_arp_table *entry, *tmp;
2258 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2259 unsigned char *src = hdr->h_source;
2260
2261 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2262 hlist_for_each_entry_safe(entry, next,
2263 &priv->lec_arp_empty_ones, next) {
2264 if (vcc == entry->vcc) {
2265 del_timer(&entry->timer);
2266 ether_addr_copy(entry->mac_addr, src);
2267 entry->status = ESI_FORWARD_DIRECT;
2268 entry->last_used = jiffies;
2269 /* We might have got an entry */
2270 tmp = lec_arp_find(priv, src);
2271 if (tmp) {
2272 lec_arp_remove(priv, tmp);
2273 lec_arp_put(tmp);
2274 }
2275 hlist_del(&entry->next);
2276 lec_arp_add(priv, entry);
2277 goto out;
2278 }
2279 }
2280 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2281 out:
2282 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2283 }
2284
2285 MODULE_LICENSE("GPL");
Linux with added FPC-III support