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Merge tag 'dmaengine-4.19-rc1' of git://git.infradead.org/users/vkoul/slave-dma
[thirdparty/linux.git] / net / atm / lec.c
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 IS_ENABLED(CONFIG_BRIDGE)
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 /* Hardening for Spectre-v1 */
45 #include <linux/nospec.h>
46
47 #include "lec.h"
48 #include "lec_arpc.h"
49 #include "resources.h"
50
51 #define DUMP_PACKETS 0 /*
52 * 0 = None,
53 * 1 = 30 first bytes
54 * 2 = Whole packet
55 */
56
57 #define LEC_UNRES_QUE_LEN 8 /*
58 * number of tx packets to queue for a
59 * single destination while waiting for SVC
60 */
61
62 static int lec_open(struct net_device *dev);
63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
64 struct net_device *dev);
65 static int lec_close(struct net_device *dev);
66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
67 const unsigned char *mac_addr);
68 static int lec_arp_remove(struct lec_priv *priv,
69 struct lec_arp_table *to_remove);
70 /* LANE2 functions */
71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
72 const u8 *tlvs, u32 sizeoftlvs);
73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
74 u8 **tlvs, u32 *sizeoftlvs);
75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
76 const u8 *tlvs, u32 sizeoftlvs);
77
78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
79 unsigned long permanent);
80 static void lec_arp_check_empties(struct lec_priv *priv,
81 struct atm_vcc *vcc, struct sk_buff *skb);
82 static void lec_arp_destroy(struct lec_priv *priv);
83 static void lec_arp_init(struct lec_priv *priv);
84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
85 const unsigned char *mac_to_find,
86 int is_rdesc,
87 struct lec_arp_table **ret_entry);
88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
89 const unsigned char *atm_addr,
90 unsigned long remoteflag,
91 unsigned int targetless_le_arp);
92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
94 static void lec_set_flush_tran_id(struct lec_priv *priv,
95 const unsigned char *atm_addr,
96 unsigned long tran_id);
97 static void lec_vcc_added(struct lec_priv *priv,
98 const struct atmlec_ioc *ioc_data,
99 struct atm_vcc *vcc,
100 void (*old_push)(struct atm_vcc *vcc,
101 struct sk_buff *skb));
102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
103
104 /* must be done under lec_arp_lock */
105 static inline void lec_arp_hold(struct lec_arp_table *entry)
106 {
107 refcount_inc(&entry->usage);
108 }
109
110 static inline void lec_arp_put(struct lec_arp_table *entry)
111 {
112 if (refcount_dec_and_test(&entry->usage))
113 kfree(entry);
114 }
115
116 static struct lane2_ops lane2_ops = {
117 .resolve = lane2_resolve, /* spec 3.1.3 */
118 .associate_req = lane2_associate_req, /* spec 3.1.4 */
119 .associate_indicator = NULL /* spec 3.1.5 */
120 };
121
122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
123
124 /* Device structures */
125 static struct net_device *dev_lec[MAX_LEC_ITF];
126
127 #if IS_ENABLED(CONFIG_BRIDGE)
128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
129 {
130 char *buff;
131 struct lec_priv *priv;
132
133 /*
134 * Check if this is a BPDU. If so, ask zeppelin to send
135 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
136 * as the Config BPDU has
137 */
138 buff = skb->data + skb->dev->hard_header_len;
139 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
140 struct sock *sk;
141 struct sk_buff *skb2;
142 struct atmlec_msg *mesg;
143
144 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
145 if (skb2 == NULL)
146 return;
147 skb2->len = sizeof(struct atmlec_msg);
148 mesg = (struct atmlec_msg *)skb2->data;
149 mesg->type = l_topology_change;
150 buff += 4;
151 mesg->content.normal.flag = *buff & 0x01;
152 /* 0x01 is topology change */
153
154 priv = netdev_priv(dev);
155 atm_force_charge(priv->lecd, skb2->truesize);
156 sk = sk_atm(priv->lecd);
157 skb_queue_tail(&sk->sk_receive_queue, skb2);
158 sk->sk_data_ready(sk);
159 }
160 }
161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
162
163 /*
164 * Open/initialize the netdevice. This is called (in the current kernel)
165 * sometime after booting when the 'ifconfig' program is run.
166 *
167 * This routine should set everything up anew at each open, even
168 * registers that "should" only need to be set once at boot, so that
169 * there is non-reboot way to recover if something goes wrong.
170 */
171
172 static int lec_open(struct net_device *dev)
173 {
174 netif_start_queue(dev);
175
176 return 0;
177 }
178
179 static void
180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182 struct net_device *dev = skb->dev;
183
184 ATM_SKB(skb)->vcc = vcc;
185 atm_account_tx(vcc, skb);
186
187 if (vcc->send(vcc, skb) < 0) {
188 dev->stats.tx_dropped++;
189 return;
190 }
191
192 dev->stats.tx_packets++;
193 dev->stats.tx_bytes += skb->len;
194 }
195
196 static void lec_tx_timeout(struct net_device *dev)
197 {
198 pr_info("%s\n", dev->name);
199 netif_trans_update(dev);
200 netif_wake_queue(dev);
201 }
202
203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
204 struct net_device *dev)
205 {
206 struct sk_buff *skb2;
207 struct lec_priv *priv = netdev_priv(dev);
208 struct lecdatahdr_8023 *lec_h;
209 struct atm_vcc *vcc;
210 struct lec_arp_table *entry;
211 unsigned char *dst;
212 int min_frame_size;
213 int is_rdesc;
214
215 pr_debug("called\n");
216 if (!priv->lecd) {
217 pr_info("%s:No lecd attached\n", dev->name);
218 dev->stats.tx_errors++;
219 netif_stop_queue(dev);
220 kfree_skb(skb);
221 return NETDEV_TX_OK;
222 }
223
224 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
225 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
226 (long)skb_end_pointer(skb));
227 #if IS_ENABLED(CONFIG_BRIDGE)
228 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
229 lec_handle_bridge(skb, dev);
230 #endif
231
232 /* Make sure we have room for lec_id */
233 if (skb_headroom(skb) < 2) {
234 pr_debug("reallocating skb\n");
235 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
236 if (unlikely(!skb2)) {
237 kfree_skb(skb);
238 return NETDEV_TX_OK;
239 }
240 consume_skb(skb);
241 skb = skb2;
242 }
243 skb_push(skb, 2);
244
245 /* Put le header to place */
246 lec_h = (struct lecdatahdr_8023 *)skb->data;
247 lec_h->le_header = htons(priv->lecid);
248
249 #if DUMP_PACKETS >= 2
250 #define MAX_DUMP_SKB 99
251 #elif DUMP_PACKETS >= 1
252 #define MAX_DUMP_SKB 30
253 #endif
254 #if DUMP_PACKETS >= 1
255 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
256 dev->name, skb->len, priv->lecid);
257 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
258 skb->data, min(skb->len, MAX_DUMP_SKB), true);
259 #endif /* DUMP_PACKETS >= 1 */
260
261 /* Minimum ethernet-frame size */
262 min_frame_size = LEC_MINIMUM_8023_SIZE;
263 if (skb->len < min_frame_size) {
264 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
265 skb2 = skb_copy_expand(skb, 0,
266 min_frame_size - skb->truesize,
267 GFP_ATOMIC);
268 dev_kfree_skb(skb);
269 if (skb2 == NULL) {
270 dev->stats.tx_dropped++;
271 return NETDEV_TX_OK;
272 }
273 skb = skb2;
274 }
275 skb_put(skb, min_frame_size - skb->len);
276 }
277
278 /* Send to right vcc */
279 is_rdesc = 0;
280 dst = lec_h->h_dest;
281 entry = NULL;
282 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
283 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
284 dev->name, vcc, vcc ? vcc->flags : 0, entry);
285 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
286 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
287 pr_debug("%s:queuing packet, MAC address %pM\n",
288 dev->name, lec_h->h_dest);
289 skb_queue_tail(&entry->tx_wait, skb);
290 } else {
291 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
292 dev->name, lec_h->h_dest);
293 dev->stats.tx_dropped++;
294 dev_kfree_skb(skb);
295 }
296 goto out;
297 }
298 #if DUMP_PACKETS > 0
299 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
300 dev->name, vcc->vpi, vcc->vci);
301 #endif /* DUMP_PACKETS > 0 */
302
303 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
304 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
305 lec_send(vcc, skb2);
306 }
307
308 lec_send(vcc, skb);
309
310 if (!atm_may_send(vcc, 0)) {
311 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
312
313 vpriv->xoff = 1;
314 netif_stop_queue(dev);
315
316 /*
317 * vcc->pop() might have occurred in between, making
318 * the vcc usuable again. Since xmit is serialized,
319 * this is the only situation we have to re-test.
320 */
321
322 if (atm_may_send(vcc, 0))
323 netif_wake_queue(dev);
324 }
325
326 out:
327 if (entry)
328 lec_arp_put(entry);
329 netif_trans_update(dev);
330 return NETDEV_TX_OK;
331 }
332
333 /* The inverse routine to net_open(). */
334 static int lec_close(struct net_device *dev)
335 {
336 netif_stop_queue(dev);
337 return 0;
338 }
339
340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
341 {
342 unsigned long flags;
343 struct net_device *dev = (struct net_device *)vcc->proto_data;
344 struct lec_priv *priv = netdev_priv(dev);
345 struct atmlec_msg *mesg;
346 struct lec_arp_table *entry;
347 int i;
348 char *tmp; /* FIXME */
349
350 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
351 mesg = (struct atmlec_msg *)skb->data;
352 tmp = skb->data;
353 tmp += sizeof(struct atmlec_msg);
354 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
355 switch (mesg->type) {
356 case l_set_mac_addr:
357 for (i = 0; i < 6; i++)
358 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
359 break;
360 case l_del_mac_addr:
361 for (i = 0; i < 6; i++)
362 dev->dev_addr[i] = 0;
363 break;
364 case l_addr_delete:
365 lec_addr_delete(priv, mesg->content.normal.atm_addr,
366 mesg->content.normal.flag);
367 break;
368 case l_topology_change:
369 priv->topology_change = mesg->content.normal.flag;
370 break;
371 case l_flush_complete:
372 lec_flush_complete(priv, mesg->content.normal.flag);
373 break;
374 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
375 spin_lock_irqsave(&priv->lec_arp_lock, flags);
376 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
377 lec_arp_remove(priv, entry);
378 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
379
380 if (mesg->content.normal.no_source_le_narp)
381 break;
382 /* FALL THROUGH */
383 case l_arp_update:
384 lec_arp_update(priv, mesg->content.normal.mac_addr,
385 mesg->content.normal.atm_addr,
386 mesg->content.normal.flag,
387 mesg->content.normal.targetless_le_arp);
388 pr_debug("in l_arp_update\n");
389 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
390 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
391 mesg->sizeoftlvs);
392 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
393 tmp, mesg->sizeoftlvs);
394 }
395 break;
396 case l_config:
397 priv->maximum_unknown_frame_count =
398 mesg->content.config.maximum_unknown_frame_count;
399 priv->max_unknown_frame_time =
400 (mesg->content.config.max_unknown_frame_time * HZ);
401 priv->max_retry_count = mesg->content.config.max_retry_count;
402 priv->aging_time = (mesg->content.config.aging_time * HZ);
403 priv->forward_delay_time =
404 (mesg->content.config.forward_delay_time * HZ);
405 priv->arp_response_time =
406 (mesg->content.config.arp_response_time * HZ);
407 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
408 priv->path_switching_delay =
409 (mesg->content.config.path_switching_delay * HZ);
410 priv->lane_version = mesg->content.config.lane_version;
411 /* LANE2 */
412 priv->lane2_ops = NULL;
413 if (priv->lane_version > 1)
414 priv->lane2_ops = &lane2_ops;
415 rtnl_lock();
416 if (dev_set_mtu(dev, mesg->content.config.mtu))
417 pr_info("%s: change_mtu to %d failed\n",
418 dev->name, mesg->content.config.mtu);
419 rtnl_unlock();
420 priv->is_proxy = mesg->content.config.is_proxy;
421 break;
422 case l_flush_tran_id:
423 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
424 mesg->content.normal.flag);
425 break;
426 case l_set_lecid:
427 priv->lecid =
428 (unsigned short)(0xffff & mesg->content.normal.flag);
429 break;
430 case l_should_bridge:
431 #if IS_ENABLED(CONFIG_BRIDGE)
432 {
433 pr_debug("%s: bridge zeppelin asks about %pM\n",
434 dev->name, mesg->content.proxy.mac_addr);
435
436 if (br_fdb_test_addr_hook == NULL)
437 break;
438
439 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
440 /* hit from bridge table, send LE_ARP_RESPONSE */
441 struct sk_buff *skb2;
442 struct sock *sk;
443
444 pr_debug("%s: entry found, responding to zeppelin\n",
445 dev->name);
446 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
447 if (skb2 == NULL)
448 break;
449 skb2->len = sizeof(struct atmlec_msg);
450 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
451 atm_force_charge(priv->lecd, skb2->truesize);
452 sk = sk_atm(priv->lecd);
453 skb_queue_tail(&sk->sk_receive_queue, skb2);
454 sk->sk_data_ready(sk);
455 }
456 }
457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
458 break;
459 default:
460 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
461 dev_kfree_skb(skb);
462 return -EINVAL;
463 }
464 dev_kfree_skb(skb);
465 return 0;
466 }
467
468 static void lec_atm_close(struct atm_vcc *vcc)
469 {
470 struct sk_buff *skb;
471 struct net_device *dev = (struct net_device *)vcc->proto_data;
472 struct lec_priv *priv = netdev_priv(dev);
473
474 priv->lecd = NULL;
475 /* Do something needful? */
476
477 netif_stop_queue(dev);
478 lec_arp_destroy(priv);
479
480 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
481 pr_info("%s closing with messages pending\n", dev->name);
482 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
483 atm_return(vcc, skb->truesize);
484 dev_kfree_skb(skb);
485 }
486
487 pr_info("%s: Shut down!\n", dev->name);
488 module_put(THIS_MODULE);
489 }
490
491 static const struct atmdev_ops lecdev_ops = {
492 .close = lec_atm_close,
493 .send = lec_atm_send
494 };
495
496 static struct atm_dev lecatm_dev = {
497 .ops = &lecdev_ops,
498 .type = "lec",
499 .number = 999, /* dummy device number */
500 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
501 };
502
503 /*
504 * LANE2: new argument struct sk_buff *data contains
505 * the LE_ARP based TLVs introduced in the LANE2 spec
506 */
507 static int
508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
509 const unsigned char *mac_addr, const unsigned char *atm_addr,
510 struct sk_buff *data)
511 {
512 struct sock *sk;
513 struct sk_buff *skb;
514 struct atmlec_msg *mesg;
515
516 if (!priv || !priv->lecd)
517 return -1;
518 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
519 if (!skb)
520 return -1;
521 skb->len = sizeof(struct atmlec_msg);
522 mesg = (struct atmlec_msg *)skb->data;
523 memset(mesg, 0, sizeof(struct atmlec_msg));
524 mesg->type = type;
525 if (data != NULL)
526 mesg->sizeoftlvs = data->len;
527 if (mac_addr)
528 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
529 else
530 mesg->content.normal.targetless_le_arp = 1;
531 if (atm_addr)
532 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
533
534 atm_force_charge(priv->lecd, skb->truesize);
535 sk = sk_atm(priv->lecd);
536 skb_queue_tail(&sk->sk_receive_queue, skb);
537 sk->sk_data_ready(sk);
538
539 if (data != NULL) {
540 pr_debug("about to send %d bytes of data\n", data->len);
541 atm_force_charge(priv->lecd, data->truesize);
542 skb_queue_tail(&sk->sk_receive_queue, data);
543 sk->sk_data_ready(sk);
544 }
545
546 return 0;
547 }
548
549 static void lec_set_multicast_list(struct net_device *dev)
550 {
551 /*
552 * by default, all multicast frames arrive over the bus.
553 * eventually support selective multicast service
554 */
555 }
556
557 static const struct net_device_ops lec_netdev_ops = {
558 .ndo_open = lec_open,
559 .ndo_stop = lec_close,
560 .ndo_start_xmit = lec_start_xmit,
561 .ndo_tx_timeout = lec_tx_timeout,
562 .ndo_set_rx_mode = lec_set_multicast_list,
563 };
564
565 static const unsigned char lec_ctrl_magic[] = {
566 0xff,
567 0x00,
568 0x01,
569 0x01
570 };
571
572 #define LEC_DATA_DIRECT_8023 2
573 #define LEC_DATA_DIRECT_8025 3
574
575 static int lec_is_data_direct(struct atm_vcc *vcc)
576 {
577 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
578 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
579 }
580
581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
582 {
583 unsigned long flags;
584 struct net_device *dev = (struct net_device *)vcc->proto_data;
585 struct lec_priv *priv = netdev_priv(dev);
586
587 #if DUMP_PACKETS > 0
588 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
589 dev->name, vcc->vpi, vcc->vci);
590 #endif
591 if (!skb) {
592 pr_debug("%s: null skb\n", dev->name);
593 lec_vcc_close(priv, vcc);
594 return;
595 }
596 #if DUMP_PACKETS >= 2
597 #define MAX_SKB_DUMP 99
598 #elif DUMP_PACKETS >= 1
599 #define MAX_SKB_DUMP 30
600 #endif
601 #if DUMP_PACKETS > 0
602 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
603 dev->name, skb->len, priv->lecid);
604 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
605 skb->data, min(MAX_SKB_DUMP, skb->len), true);
606 #endif /* DUMP_PACKETS > 0 */
607 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
608 /* Control frame, to daemon */
609 struct sock *sk = sk_atm(vcc);
610
611 pr_debug("%s: To daemon\n", dev->name);
612 skb_queue_tail(&sk->sk_receive_queue, skb);
613 sk->sk_data_ready(sk);
614 } else { /* Data frame, queue to protocol handlers */
615 struct lec_arp_table *entry;
616 unsigned char *src, *dst;
617
618 atm_return(vcc, skb->truesize);
619 if (*(__be16 *) skb->data == htons(priv->lecid) ||
620 !priv->lecd || !(dev->flags & IFF_UP)) {
621 /*
622 * Probably looping back, or if lecd is missing,
623 * lecd has gone down
624 */
625 pr_debug("Ignoring frame...\n");
626 dev_kfree_skb(skb);
627 return;
628 }
629 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
630
631 /*
632 * If this is a Data Direct VCC, and the VCC does not match
633 * the LE_ARP cache entry, delete the LE_ARP cache entry.
634 */
635 spin_lock_irqsave(&priv->lec_arp_lock, flags);
636 if (lec_is_data_direct(vcc)) {
637 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
638 entry = lec_arp_find(priv, src);
639 if (entry && entry->vcc != vcc) {
640 lec_arp_remove(priv, entry);
641 lec_arp_put(entry);
642 }
643 }
644 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
645
646 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
647 !priv->is_proxy && /* Proxy wants all the packets */
648 memcmp(dst, dev->dev_addr, dev->addr_len)) {
649 dev_kfree_skb(skb);
650 return;
651 }
652 if (!hlist_empty(&priv->lec_arp_empty_ones))
653 lec_arp_check_empties(priv, vcc, skb);
654 skb_pull(skb, 2); /* skip lec_id */
655 skb->protocol = eth_type_trans(skb, dev);
656 dev->stats.rx_packets++;
657 dev->stats.rx_bytes += skb->len;
658 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
659 netif_rx(skb);
660 }
661 }
662
663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
664 {
665 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
666 struct net_device *dev = skb->dev;
667
668 if (vpriv == NULL) {
669 pr_info("vpriv = NULL!?!?!?\n");
670 return;
671 }
672
673 vpriv->old_pop(vcc, skb);
674
675 if (vpriv->xoff && atm_may_send(vcc, 0)) {
676 vpriv->xoff = 0;
677 if (netif_running(dev) && netif_queue_stopped(dev))
678 netif_wake_queue(dev);
679 }
680 }
681
682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
683 {
684 struct lec_vcc_priv *vpriv;
685 int bytes_left;
686 struct atmlec_ioc ioc_data;
687
688 /* Lecd must be up in this case */
689 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
690 if (bytes_left != 0)
691 pr_info("copy from user failed for %d bytes\n", bytes_left);
692 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
693 return -EINVAL;
694 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
695 if (!dev_lec[ioc_data.dev_num])
696 return -EINVAL;
697 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
698 if (!vpriv)
699 return -ENOMEM;
700 vpriv->xoff = 0;
701 vpriv->old_pop = vcc->pop;
702 vcc->user_back = vpriv;
703 vcc->pop = lec_pop;
704 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
705 &ioc_data, vcc, vcc->push);
706 vcc->proto_data = dev_lec[ioc_data.dev_num];
707 vcc->push = lec_push;
708 return 0;
709 }
710
711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
712 {
713 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
714 return -EINVAL;
715 vcc->proto_data = dev_lec[arg];
716 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
717 }
718
719 /* Initialize device. */
720 static int lecd_attach(struct atm_vcc *vcc, int arg)
721 {
722 int i;
723 struct lec_priv *priv;
724
725 if (arg < 0)
726 i = 0;
727 else
728 i = arg;
729 if (arg >= MAX_LEC_ITF)
730 return -EINVAL;
731 if (!dev_lec[i]) {
732 int size;
733
734 size = sizeof(struct lec_priv);
735 dev_lec[i] = alloc_etherdev(size);
736 if (!dev_lec[i])
737 return -ENOMEM;
738 dev_lec[i]->netdev_ops = &lec_netdev_ops;
739 dev_lec[i]->max_mtu = 18190;
740 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
741 if (register_netdev(dev_lec[i])) {
742 free_netdev(dev_lec[i]);
743 return -EINVAL;
744 }
745
746 priv = netdev_priv(dev_lec[i]);
747 } else {
748 priv = netdev_priv(dev_lec[i]);
749 if (priv->lecd)
750 return -EADDRINUSE;
751 }
752 lec_arp_init(priv);
753 priv->itfnum = i; /* LANE2 addition */
754 priv->lecd = vcc;
755 vcc->dev = &lecatm_dev;
756 vcc_insert_socket(sk_atm(vcc));
757
758 vcc->proto_data = dev_lec[i];
759 set_bit(ATM_VF_META, &vcc->flags);
760 set_bit(ATM_VF_READY, &vcc->flags);
761
762 /* Set default values to these variables */
763 priv->maximum_unknown_frame_count = 1;
764 priv->max_unknown_frame_time = (1 * HZ);
765 priv->vcc_timeout_period = (1200 * HZ);
766 priv->max_retry_count = 1;
767 priv->aging_time = (300 * HZ);
768 priv->forward_delay_time = (15 * HZ);
769 priv->topology_change = 0;
770 priv->arp_response_time = (1 * HZ);
771 priv->flush_timeout = (4 * HZ);
772 priv->path_switching_delay = (6 * HZ);
773
774 if (dev_lec[i]->flags & IFF_UP)
775 netif_start_queue(dev_lec[i]);
776 __module_get(THIS_MODULE);
777 return i;
778 }
779
780 #ifdef CONFIG_PROC_FS
781 static const char *lec_arp_get_status_string(unsigned char status)
782 {
783 static const char *const lec_arp_status_string[] = {
784 "ESI_UNKNOWN ",
785 "ESI_ARP_PENDING ",
786 "ESI_VC_PENDING ",
787 "<Undefined> ",
788 "ESI_FLUSH_PENDING ",
789 "ESI_FORWARD_DIRECT"
790 };
791
792 if (status > ESI_FORWARD_DIRECT)
793 status = 3; /* ESI_UNDEFINED */
794 return lec_arp_status_string[status];
795 }
796
797 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
798 {
799 int i;
800
801 for (i = 0; i < ETH_ALEN; i++)
802 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
803 seq_printf(seq, " ");
804 for (i = 0; i < ATM_ESA_LEN; i++)
805 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
806 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
807 entry->flags & 0xffff);
808 if (entry->vcc)
809 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
810 else
811 seq_printf(seq, " ");
812 if (entry->recv_vcc) {
813 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
814 entry->recv_vcc->vci);
815 }
816 seq_putc(seq, '\n');
817 }
818
819 struct lec_state {
820 unsigned long flags;
821 struct lec_priv *locked;
822 struct hlist_node *node;
823 struct net_device *dev;
824 int itf;
825 int arp_table;
826 int misc_table;
827 };
828
829 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
830 loff_t *l)
831 {
832 struct hlist_node *e = state->node;
833
834 if (!e)
835 e = tbl->first;
836 if (e == SEQ_START_TOKEN) {
837 e = tbl->first;
838 --*l;
839 }
840
841 for (; e; e = e->next) {
842 if (--*l < 0)
843 break;
844 }
845 state->node = e;
846
847 return (*l < 0) ? state : NULL;
848 }
849
850 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
851 struct lec_priv *priv)
852 {
853 void *v = NULL;
854 int p;
855
856 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
857 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
858 if (v)
859 break;
860 }
861 state->arp_table = p;
862 return v;
863 }
864
865 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
866 struct lec_priv *priv)
867 {
868 struct hlist_head *lec_misc_tables[] = {
869 &priv->lec_arp_empty_ones,
870 &priv->lec_no_forward,
871 &priv->mcast_fwds
872 };
873 void *v = NULL;
874 int q;
875
876 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
877 v = lec_tbl_walk(state, lec_misc_tables[q], l);
878 if (v)
879 break;
880 }
881 state->misc_table = q;
882 return v;
883 }
884
885 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
886 struct lec_priv *priv)
887 {
888 if (!state->locked) {
889 state->locked = priv;
890 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
891 }
892 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
893 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
894 state->locked = NULL;
895 /* Partial state reset for the next time we get called */
896 state->arp_table = state->misc_table = 0;
897 }
898 return state->locked;
899 }
900
901 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
902 {
903 struct net_device *dev;
904 void *v;
905
906 dev = state->dev ? state->dev : dev_lec[state->itf];
907 v = (dev && netdev_priv(dev)) ?
908 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
909 if (!v && dev) {
910 dev_put(dev);
911 /* Partial state reset for the next time we get called */
912 dev = NULL;
913 }
914 state->dev = dev;
915 return v;
916 }
917
918 static void *lec_get_idx(struct lec_state *state, loff_t l)
919 {
920 void *v = NULL;
921
922 for (; state->itf < MAX_LEC_ITF; state->itf++) {
923 v = lec_itf_walk(state, &l);
924 if (v)
925 break;
926 }
927 return v;
928 }
929
930 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
931 {
932 struct lec_state *state = seq->private;
933
934 state->itf = 0;
935 state->dev = NULL;
936 state->locked = NULL;
937 state->arp_table = 0;
938 state->misc_table = 0;
939 state->node = SEQ_START_TOKEN;
940
941 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
942 }
943
944 static void lec_seq_stop(struct seq_file *seq, void *v)
945 {
946 struct lec_state *state = seq->private;
947
948 if (state->dev) {
949 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
950 state->flags);
951 dev_put(state->dev);
952 }
953 }
954
955 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
956 {
957 struct lec_state *state = seq->private;
958
959 v = lec_get_idx(state, 1);
960 *pos += !!PTR_ERR(v);
961 return v;
962 }
963
964 static int lec_seq_show(struct seq_file *seq, void *v)
965 {
966 static const char lec_banner[] =
967 "Itf MAC ATM destination"
968 " Status Flags "
969 "VPI/VCI Recv VPI/VCI\n";
970
971 if (v == SEQ_START_TOKEN)
972 seq_puts(seq, lec_banner);
973 else {
974 struct lec_state *state = seq->private;
975 struct net_device *dev = state->dev;
976 struct lec_arp_table *entry = hlist_entry(state->node,
977 struct lec_arp_table,
978 next);
979
980 seq_printf(seq, "%s ", dev->name);
981 lec_info(seq, entry);
982 }
983 return 0;
984 }
985
986 static const struct seq_operations lec_seq_ops = {
987 .start = lec_seq_start,
988 .next = lec_seq_next,
989 .stop = lec_seq_stop,
990 .show = lec_seq_show,
991 };
992 #endif
993
994 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
995 {
996 struct atm_vcc *vcc = ATM_SD(sock);
997 int err = 0;
998
999 switch (cmd) {
1000 case ATMLEC_CTRL:
1001 case ATMLEC_MCAST:
1002 case ATMLEC_DATA:
1003 if (!capable(CAP_NET_ADMIN))
1004 return -EPERM;
1005 break;
1006 default:
1007 return -ENOIOCTLCMD;
1008 }
1009
1010 switch (cmd) {
1011 case ATMLEC_CTRL:
1012 err = lecd_attach(vcc, (int)arg);
1013 if (err >= 0)
1014 sock->state = SS_CONNECTED;
1015 break;
1016 case ATMLEC_MCAST:
1017 err = lec_mcast_attach(vcc, (int)arg);
1018 break;
1019 case ATMLEC_DATA:
1020 err = lec_vcc_attach(vcc, (void __user *)arg);
1021 break;
1022 }
1023
1024 return err;
1025 }
1026
1027 static struct atm_ioctl lane_ioctl_ops = {
1028 .owner = THIS_MODULE,
1029 .ioctl = lane_ioctl,
1030 };
1031
1032 static int __init lane_module_init(void)
1033 {
1034 #ifdef CONFIG_PROC_FS
1035 struct proc_dir_entry *p;
1036
1037 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1038 sizeof(struct lec_state), NULL);
1039 if (!p) {
1040 pr_err("Unable to initialize /proc/net/atm/lec\n");
1041 return -ENOMEM;
1042 }
1043 #endif
1044
1045 register_atm_ioctl(&lane_ioctl_ops);
1046 pr_info("lec.c: initialized\n");
1047 return 0;
1048 }
1049
1050 static void __exit lane_module_cleanup(void)
1051 {
1052 int i;
1053
1054 #ifdef CONFIG_PROC_FS
1055 remove_proc_entry("lec", atm_proc_root);
1056 #endif
1057
1058 deregister_atm_ioctl(&lane_ioctl_ops);
1059
1060 for (i = 0; i < MAX_LEC_ITF; i++) {
1061 if (dev_lec[i] != NULL) {
1062 unregister_netdev(dev_lec[i]);
1063 free_netdev(dev_lec[i]);
1064 dev_lec[i] = NULL;
1065 }
1066 }
1067 }
1068
1069 module_init(lane_module_init);
1070 module_exit(lane_module_cleanup);
1071
1072 /*
1073 * LANE2: 3.1.3, LE_RESOLVE.request
1074 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1075 * If sizeoftlvs == NULL the default TLVs associated with with this
1076 * lec will be used.
1077 * If dst_mac == NULL, targetless LE_ARP will be sent
1078 */
1079 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1080 u8 **tlvs, u32 *sizeoftlvs)
1081 {
1082 unsigned long flags;
1083 struct lec_priv *priv = netdev_priv(dev);
1084 struct lec_arp_table *table;
1085 struct sk_buff *skb;
1086 int retval;
1087
1088 if (force == 0) {
1089 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1090 table = lec_arp_find(priv, dst_mac);
1091 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1092 if (table == NULL)
1093 return -1;
1094
1095 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1096 if (*tlvs == NULL)
1097 return -1;
1098
1099 *sizeoftlvs = table->sizeoftlvs;
1100
1101 return 0;
1102 }
1103
1104 if (sizeoftlvs == NULL)
1105 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1106
1107 else {
1108 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1109 if (skb == NULL)
1110 return -1;
1111 skb->len = *sizeoftlvs;
1112 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1113 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1114 }
1115 return retval;
1116 }
1117
1118 /*
1119 * LANE2: 3.1.4, LE_ASSOCIATE.request
1120 * Associate the *tlvs with the *lan_dst address.
1121 * Will overwrite any previous association
1122 * Returns 1 for success, 0 for failure (out of memory)
1123 *
1124 */
1125 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1126 const u8 *tlvs, u32 sizeoftlvs)
1127 {
1128 int retval;
1129 struct sk_buff *skb;
1130 struct lec_priv *priv = netdev_priv(dev);
1131
1132 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1133 return 0; /* not our mac address */
1134
1135 kfree(priv->tlvs); /* NULL if there was no previous association */
1136
1137 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1138 if (priv->tlvs == NULL)
1139 return 0;
1140 priv->sizeoftlvs = sizeoftlvs;
1141
1142 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1143 if (skb == NULL)
1144 return 0;
1145 skb->len = sizeoftlvs;
1146 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1147 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1148 if (retval != 0)
1149 pr_info("lec.c: lane2_associate_req() failed\n");
1150 /*
1151 * If the previous association has changed we must
1152 * somehow notify other LANE entities about the change
1153 */
1154 return 1;
1155 }
1156
1157 /*
1158 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1159 *
1160 */
1161 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1162 const u8 *tlvs, u32 sizeoftlvs)
1163 {
1164 #if 0
1165 int i = 0;
1166 #endif
1167 struct lec_priv *priv = netdev_priv(dev);
1168 #if 0 /*
1169 * Why have the TLVs in LE_ARP entries
1170 * since we do not use them? When you
1171 * uncomment this code, make sure the
1172 * TLVs get freed when entry is killed
1173 */
1174 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1175
1176 if (entry == NULL)
1177 return; /* should not happen */
1178
1179 kfree(entry->tlvs);
1180
1181 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1182 if (entry->tlvs == NULL)
1183 return;
1184 entry->sizeoftlvs = sizeoftlvs;
1185 #endif
1186 #if 0
1187 pr_info("\n");
1188 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1189 while (i < sizeoftlvs)
1190 pr_cont("%02x ", tlvs[i++]);
1191
1192 pr_cont("\n");
1193 #endif
1194
1195 /* tell MPOA about the TLVs we saw */
1196 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1197 priv->lane2_ops->associate_indicator(dev, mac_addr,
1198 tlvs, sizeoftlvs);
1199 }
1200 }
1201
1202 /*
1203 * Here starts what used to lec_arpc.c
1204 *
1205 * lec_arpc.c was added here when making
1206 * lane client modular. October 1997
1207 */
1208
1209 #include <linux/types.h>
1210 #include <linux/timer.h>
1211 #include <linux/param.h>
1212 #include <linux/atomic.h>
1213 #include <linux/inetdevice.h>
1214 #include <net/route.h>
1215
1216 #if 0
1217 #define pr_debug(format, args...)
1218 /*
1219 #define pr_debug printk
1220 */
1221 #endif
1222 #define DEBUG_ARP_TABLE 0
1223
1224 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1225
1226 static void lec_arp_check_expire(struct work_struct *work);
1227 static void lec_arp_expire_arp(struct timer_list *t);
1228
1229 /*
1230 * Arp table funcs
1231 */
1232
1233 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1234
1235 /*
1236 * Initialization of arp-cache
1237 */
1238 static void lec_arp_init(struct lec_priv *priv)
1239 {
1240 unsigned short i;
1241
1242 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1243 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1244 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1245 INIT_HLIST_HEAD(&priv->lec_no_forward);
1246 INIT_HLIST_HEAD(&priv->mcast_fwds);
1247 spin_lock_init(&priv->lec_arp_lock);
1248 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1249 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1250 }
1251
1252 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1253 {
1254 if (entry->vcc) {
1255 struct atm_vcc *vcc = entry->vcc;
1256 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1257 struct net_device *dev = (struct net_device *)vcc->proto_data;
1258
1259 vcc->pop = vpriv->old_pop;
1260 if (vpriv->xoff)
1261 netif_wake_queue(dev);
1262 kfree(vpriv);
1263 vcc->user_back = NULL;
1264 vcc->push = entry->old_push;
1265 vcc_release_async(vcc, -EPIPE);
1266 entry->vcc = NULL;
1267 }
1268 if (entry->recv_vcc) {
1269 entry->recv_vcc->push = entry->old_recv_push;
1270 vcc_release_async(entry->recv_vcc, -EPIPE);
1271 entry->recv_vcc = NULL;
1272 }
1273 }
1274
1275 /*
1276 * Insert entry to lec_arp_table
1277 * LANE2: Add to the end of the list to satisfy 8.1.13
1278 */
1279 static inline void
1280 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1281 {
1282 struct hlist_head *tmp;
1283
1284 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1285 hlist_add_head(&entry->next, tmp);
1286
1287 pr_debug("Added entry:%pM\n", entry->mac_addr);
1288 }
1289
1290 /*
1291 * Remove entry from lec_arp_table
1292 */
1293 static int
1294 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1295 {
1296 struct lec_arp_table *entry;
1297 int i, remove_vcc = 1;
1298
1299 if (!to_remove)
1300 return -1;
1301
1302 hlist_del(&to_remove->next);
1303 del_timer(&to_remove->timer);
1304
1305 /*
1306 * If this is the only MAC connected to this VCC,
1307 * also tear down the VCC
1308 */
1309 if (to_remove->status >= ESI_FLUSH_PENDING) {
1310 /*
1311 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1312 */
1313 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1314 hlist_for_each_entry(entry,
1315 &priv->lec_arp_tables[i], next) {
1316 if (memcmp(to_remove->atm_addr,
1317 entry->atm_addr, ATM_ESA_LEN) == 0) {
1318 remove_vcc = 0;
1319 break;
1320 }
1321 }
1322 }
1323 if (remove_vcc)
1324 lec_arp_clear_vccs(to_remove);
1325 }
1326 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1327
1328 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1329 return 0;
1330 }
1331
1332 #if DEBUG_ARP_TABLE
1333 static const char *get_status_string(unsigned char st)
1334 {
1335 switch (st) {
1336 case ESI_UNKNOWN:
1337 return "ESI_UNKNOWN";
1338 case ESI_ARP_PENDING:
1339 return "ESI_ARP_PENDING";
1340 case ESI_VC_PENDING:
1341 return "ESI_VC_PENDING";
1342 case ESI_FLUSH_PENDING:
1343 return "ESI_FLUSH_PENDING";
1344 case ESI_FORWARD_DIRECT:
1345 return "ESI_FORWARD_DIRECT";
1346 }
1347 return "<UNKNOWN>";
1348 }
1349
1350 static void dump_arp_table(struct lec_priv *priv)
1351 {
1352 struct lec_arp_table *rulla;
1353 char buf[256];
1354 int i, j, offset;
1355
1356 pr_info("Dump %p:\n", priv);
1357 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1358 hlist_for_each_entry(rulla,
1359 &priv->lec_arp_tables[i], next) {
1360 offset = 0;
1361 offset += sprintf(buf, "%d: %p\n", i, rulla);
1362 offset += sprintf(buf + offset, "Mac: %pM",
1363 rulla->mac_addr);
1364 offset += sprintf(buf + offset, " Atm:");
1365 for (j = 0; j < ATM_ESA_LEN; j++) {
1366 offset += sprintf(buf + offset,
1367 "%2.2x ",
1368 rulla->atm_addr[j] & 0xff);
1369 }
1370 offset += sprintf(buf + offset,
1371 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1372 rulla->vcc ? rulla->vcc->vpi : 0,
1373 rulla->vcc ? rulla->vcc->vci : 0,
1374 rulla->recv_vcc ? rulla->recv_vcc->
1375 vpi : 0,
1376 rulla->recv_vcc ? rulla->recv_vcc->
1377 vci : 0, rulla->last_used,
1378 rulla->timestamp, rulla->no_tries);
1379 offset +=
1380 sprintf(buf + offset,
1381 "Flags:%x, Packets_flooded:%x, Status: %s ",
1382 rulla->flags, rulla->packets_flooded,
1383 get_status_string(rulla->status));
1384 pr_info("%s\n", buf);
1385 }
1386 }
1387
1388 if (!hlist_empty(&priv->lec_no_forward))
1389 pr_info("No forward\n");
1390 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1391 offset = 0;
1392 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1393 offset += sprintf(buf + offset, " Atm:");
1394 for (j = 0; j < ATM_ESA_LEN; j++) {
1395 offset += sprintf(buf + offset, "%2.2x ",
1396 rulla->atm_addr[j] & 0xff);
1397 }
1398 offset += sprintf(buf + offset,
1399 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1400 rulla->vcc ? rulla->vcc->vpi : 0,
1401 rulla->vcc ? rulla->vcc->vci : 0,
1402 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1403 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1404 rulla->last_used,
1405 rulla->timestamp, rulla->no_tries);
1406 offset += sprintf(buf + offset,
1407 "Flags:%x, Packets_flooded:%x, Status: %s ",
1408 rulla->flags, rulla->packets_flooded,
1409 get_status_string(rulla->status));
1410 pr_info("%s\n", buf);
1411 }
1412
1413 if (!hlist_empty(&priv->lec_arp_empty_ones))
1414 pr_info("Empty ones\n");
1415 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1416 offset = 0;
1417 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1418 offset += sprintf(buf + offset, " Atm:");
1419 for (j = 0; j < ATM_ESA_LEN; j++) {
1420 offset += sprintf(buf + offset, "%2.2x ",
1421 rulla->atm_addr[j] & 0xff);
1422 }
1423 offset += sprintf(buf + offset,
1424 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1425 rulla->vcc ? rulla->vcc->vpi : 0,
1426 rulla->vcc ? rulla->vcc->vci : 0,
1427 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1428 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1429 rulla->last_used,
1430 rulla->timestamp, rulla->no_tries);
1431 offset += sprintf(buf + offset,
1432 "Flags:%x, Packets_flooded:%x, Status: %s ",
1433 rulla->flags, rulla->packets_flooded,
1434 get_status_string(rulla->status));
1435 pr_info("%s", buf);
1436 }
1437
1438 if (!hlist_empty(&priv->mcast_fwds))
1439 pr_info("Multicast Forward VCCs\n");
1440 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1441 offset = 0;
1442 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1443 offset += sprintf(buf + offset, " Atm:");
1444 for (j = 0; j < ATM_ESA_LEN; j++) {
1445 offset += sprintf(buf + offset, "%2.2x ",
1446 rulla->atm_addr[j] & 0xff);
1447 }
1448 offset += sprintf(buf + offset,
1449 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1450 rulla->vcc ? rulla->vcc->vpi : 0,
1451 rulla->vcc ? rulla->vcc->vci : 0,
1452 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1453 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1454 rulla->last_used,
1455 rulla->timestamp, rulla->no_tries);
1456 offset += sprintf(buf + offset,
1457 "Flags:%x, Packets_flooded:%x, Status: %s ",
1458 rulla->flags, rulla->packets_flooded,
1459 get_status_string(rulla->status));
1460 pr_info("%s\n", buf);
1461 }
1462
1463 }
1464 #else
1465 #define dump_arp_table(priv) do { } while (0)
1466 #endif
1467
1468 /*
1469 * Destruction of arp-cache
1470 */
1471 static void lec_arp_destroy(struct lec_priv *priv)
1472 {
1473 unsigned long flags;
1474 struct hlist_node *next;
1475 struct lec_arp_table *entry;
1476 int i;
1477
1478 cancel_delayed_work_sync(&priv->lec_arp_work);
1479
1480 /*
1481 * Remove all entries
1482 */
1483
1484 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1485 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1486 hlist_for_each_entry_safe(entry, next,
1487 &priv->lec_arp_tables[i], next) {
1488 lec_arp_remove(priv, entry);
1489 lec_arp_put(entry);
1490 }
1491 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1492 }
1493
1494 hlist_for_each_entry_safe(entry, next,
1495 &priv->lec_arp_empty_ones, next) {
1496 del_timer_sync(&entry->timer);
1497 lec_arp_clear_vccs(entry);
1498 hlist_del(&entry->next);
1499 lec_arp_put(entry);
1500 }
1501 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1502
1503 hlist_for_each_entry_safe(entry, next,
1504 &priv->lec_no_forward, next) {
1505 del_timer_sync(&entry->timer);
1506 lec_arp_clear_vccs(entry);
1507 hlist_del(&entry->next);
1508 lec_arp_put(entry);
1509 }
1510 INIT_HLIST_HEAD(&priv->lec_no_forward);
1511
1512 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1513 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1514 lec_arp_clear_vccs(entry);
1515 hlist_del(&entry->next);
1516 lec_arp_put(entry);
1517 }
1518 INIT_HLIST_HEAD(&priv->mcast_fwds);
1519 priv->mcast_vcc = NULL;
1520 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1521 }
1522
1523 /*
1524 * Find entry by mac_address
1525 */
1526 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1527 const unsigned char *mac_addr)
1528 {
1529 struct hlist_head *head;
1530 struct lec_arp_table *entry;
1531
1532 pr_debug("%pM\n", mac_addr);
1533
1534 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1535 hlist_for_each_entry(entry, head, next) {
1536 if (ether_addr_equal(mac_addr, entry->mac_addr))
1537 return entry;
1538 }
1539 return NULL;
1540 }
1541
1542 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1543 const unsigned char *mac_addr)
1544 {
1545 struct lec_arp_table *to_return;
1546
1547 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1548 if (!to_return) {
1549 pr_info("LEC: Arp entry kmalloc failed\n");
1550 return NULL;
1551 }
1552 ether_addr_copy(to_return->mac_addr, mac_addr);
1553 INIT_HLIST_NODE(&to_return->next);
1554 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1555 to_return->last_used = jiffies;
1556 to_return->priv = priv;
1557 skb_queue_head_init(&to_return->tx_wait);
1558 refcount_set(&to_return->usage, 1);
1559 return to_return;
1560 }
1561
1562 /* Arp sent timer expired */
1563 static void lec_arp_expire_arp(struct timer_list *t)
1564 {
1565 struct lec_arp_table *entry;
1566
1567 entry = from_timer(entry, t, timer);
1568
1569 pr_debug("\n");
1570 if (entry->status == ESI_ARP_PENDING) {
1571 if (entry->no_tries <= entry->priv->max_retry_count) {
1572 if (entry->is_rdesc)
1573 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1574 entry->mac_addr, NULL, NULL);
1575 else
1576 send_to_lecd(entry->priv, l_arp_xmt,
1577 entry->mac_addr, NULL, NULL);
1578 entry->no_tries++;
1579 }
1580 mod_timer(&entry->timer, jiffies + (1 * HZ));
1581 }
1582 }
1583
1584 /* Unknown/unused vcc expire, remove associated entry */
1585 static void lec_arp_expire_vcc(struct timer_list *t)
1586 {
1587 unsigned long flags;
1588 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1589 struct lec_priv *priv = to_remove->priv;
1590
1591 del_timer(&to_remove->timer);
1592
1593 pr_debug("%p %p: vpi:%d vci:%d\n",
1594 to_remove, priv,
1595 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1596 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1597
1598 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1599 hlist_del(&to_remove->next);
1600 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1601
1602 lec_arp_clear_vccs(to_remove);
1603 lec_arp_put(to_remove);
1604 }
1605
1606 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1607 unsigned long now,
1608 struct lec_priv *priv)
1609 {
1610 unsigned long time_to_check;
1611
1612 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1613 time_to_check = priv->forward_delay_time;
1614 else
1615 time_to_check = priv->aging_time;
1616
1617 pr_debug("About to expire: %lx - %lx > %lx\n",
1618 now, entry->last_used, time_to_check);
1619 if (time_after(now, entry->last_used + time_to_check) &&
1620 !(entry->flags & LEC_PERMANENT_FLAG) &&
1621 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1622 /* Remove entry */
1623 pr_debug("Entry timed out\n");
1624 lec_arp_remove(priv, entry);
1625 lec_arp_put(entry);
1626 } else {
1627 /* Something else */
1628 if ((entry->status == ESI_VC_PENDING ||
1629 entry->status == ESI_ARP_PENDING) &&
1630 time_after_eq(now, entry->timestamp +
1631 priv->max_unknown_frame_time)) {
1632 entry->timestamp = jiffies;
1633 entry->packets_flooded = 0;
1634 if (entry->status == ESI_VC_PENDING)
1635 send_to_lecd(priv, l_svc_setup,
1636 entry->mac_addr,
1637 entry->atm_addr,
1638 NULL);
1639 }
1640 if (entry->status == ESI_FLUSH_PENDING &&
1641 time_after_eq(now, entry->timestamp +
1642 priv->path_switching_delay)) {
1643 lec_arp_hold(entry);
1644 return true;
1645 }
1646 }
1647
1648 return false;
1649 }
1650 /*
1651 * Expire entries.
1652 * 1. Re-set timer
1653 * 2. For each entry, delete entries that have aged past the age limit.
1654 * 3. For each entry, depending on the status of the entry, perform
1655 * the following maintenance.
1656 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1657 * tick_count is above the max_unknown_frame_time, clear
1658 * the tick_count to zero and clear the packets_flooded counter
1659 * to zero. This supports the packet rate limit per address
1660 * while flooding unknowns.
1661 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1662 * than or equal to the path_switching_delay, change the status
1663 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1664 * regardless of the progress of the flush protocol.
1665 */
1666 static void lec_arp_check_expire(struct work_struct *work)
1667 {
1668 unsigned long flags;
1669 struct lec_priv *priv =
1670 container_of(work, struct lec_priv, lec_arp_work.work);
1671 struct hlist_node *next;
1672 struct lec_arp_table *entry;
1673 unsigned long now;
1674 int i;
1675
1676 pr_debug("%p\n", priv);
1677 now = jiffies;
1678 restart:
1679 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1680 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1681 hlist_for_each_entry_safe(entry, next,
1682 &priv->lec_arp_tables[i], next) {
1683 if (__lec_arp_check_expire(entry, now, priv)) {
1684 struct sk_buff *skb;
1685 struct atm_vcc *vcc = entry->vcc;
1686
1687 spin_unlock_irqrestore(&priv->lec_arp_lock,
1688 flags);
1689 while ((skb = skb_dequeue(&entry->tx_wait)))
1690 lec_send(vcc, skb);
1691 entry->last_used = jiffies;
1692 entry->status = ESI_FORWARD_DIRECT;
1693 lec_arp_put(entry);
1694
1695 goto restart;
1696 }
1697 }
1698 }
1699 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1700
1701 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1702 }
1703
1704 /*
1705 * Try to find vcc where mac_address is attached.
1706 *
1707 */
1708 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1709 const unsigned char *mac_to_find,
1710 int is_rdesc,
1711 struct lec_arp_table **ret_entry)
1712 {
1713 unsigned long flags;
1714 struct lec_arp_table *entry;
1715 struct atm_vcc *found;
1716
1717 if (mac_to_find[0] & 0x01) {
1718 switch (priv->lane_version) {
1719 case 1:
1720 return priv->mcast_vcc;
1721 case 2: /* LANE2 wants arp for multicast addresses */
1722 if (ether_addr_equal(mac_to_find, bus_mac))
1723 return priv->mcast_vcc;
1724 break;
1725 default:
1726 break;
1727 }
1728 }
1729
1730 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1731 entry = lec_arp_find(priv, mac_to_find);
1732
1733 if (entry) {
1734 if (entry->status == ESI_FORWARD_DIRECT) {
1735 /* Connection Ok */
1736 entry->last_used = jiffies;
1737 lec_arp_hold(entry);
1738 *ret_entry = entry;
1739 found = entry->vcc;
1740 goto out;
1741 }
1742 /*
1743 * If the LE_ARP cache entry is still pending, reset count to 0
1744 * so another LE_ARP request can be made for this frame.
1745 */
1746 if (entry->status == ESI_ARP_PENDING)
1747 entry->no_tries = 0;
1748 /*
1749 * Data direct VC not yet set up, check to see if the unknown
1750 * frame count is greater than the limit. If the limit has
1751 * not been reached, allow the caller to send packet to
1752 * BUS.
1753 */
1754 if (entry->status != ESI_FLUSH_PENDING &&
1755 entry->packets_flooded <
1756 priv->maximum_unknown_frame_count) {
1757 entry->packets_flooded++;
1758 pr_debug("Flooding..\n");
1759 found = priv->mcast_vcc;
1760 goto out;
1761 }
1762 /*
1763 * We got here because entry->status == ESI_FLUSH_PENDING
1764 * or BUS flood limit was reached for an entry which is
1765 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1766 */
1767 lec_arp_hold(entry);
1768 *ret_entry = entry;
1769 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1770 entry->vcc);
1771 found = NULL;
1772 } else {
1773 /* No matching entry was found */
1774 entry = make_entry(priv, mac_to_find);
1775 pr_debug("Making entry\n");
1776 if (!entry) {
1777 found = priv->mcast_vcc;
1778 goto out;
1779 }
1780 lec_arp_add(priv, entry);
1781 /* We want arp-request(s) to be sent */
1782 entry->packets_flooded = 1;
1783 entry->status = ESI_ARP_PENDING;
1784 entry->no_tries = 1;
1785 entry->last_used = entry->timestamp = jiffies;
1786 entry->is_rdesc = is_rdesc;
1787 if (entry->is_rdesc)
1788 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1789 NULL);
1790 else
1791 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1792 entry->timer.expires = jiffies + (1 * HZ);
1793 entry->timer.function = lec_arp_expire_arp;
1794 add_timer(&entry->timer);
1795 found = priv->mcast_vcc;
1796 }
1797
1798 out:
1799 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1800 return found;
1801 }
1802
1803 static int
1804 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1805 unsigned long permanent)
1806 {
1807 unsigned long flags;
1808 struct hlist_node *next;
1809 struct lec_arp_table *entry;
1810 int i;
1811
1812 pr_debug("\n");
1813 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1814 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1815 hlist_for_each_entry_safe(entry, next,
1816 &priv->lec_arp_tables[i], next) {
1817 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1818 (permanent ||
1819 !(entry->flags & LEC_PERMANENT_FLAG))) {
1820 lec_arp_remove(priv, entry);
1821 lec_arp_put(entry);
1822 }
1823 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1824 return 0;
1825 }
1826 }
1827 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1828 return -1;
1829 }
1830
1831 /*
1832 * Notifies: Response to arp_request (atm_addr != NULL)
1833 */
1834 static void
1835 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1836 const unsigned char *atm_addr, unsigned long remoteflag,
1837 unsigned int targetless_le_arp)
1838 {
1839 unsigned long flags;
1840 struct hlist_node *next;
1841 struct lec_arp_table *entry, *tmp;
1842 int i;
1843
1844 pr_debug("%smac:%pM\n",
1845 (targetless_le_arp) ? "targetless " : "", mac_addr);
1846
1847 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1848 entry = lec_arp_find(priv, mac_addr);
1849 if (entry == NULL && targetless_le_arp)
1850 goto out; /*
1851 * LANE2: ignore targetless LE_ARPs for which
1852 * we have no entry in the cache. 7.1.30
1853 */
1854 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1855 hlist_for_each_entry_safe(entry, next,
1856 &priv->lec_arp_empty_ones, next) {
1857 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1858 hlist_del(&entry->next);
1859 del_timer(&entry->timer);
1860 tmp = lec_arp_find(priv, mac_addr);
1861 if (tmp) {
1862 del_timer(&tmp->timer);
1863 tmp->status = ESI_FORWARD_DIRECT;
1864 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1865 tmp->vcc = entry->vcc;
1866 tmp->old_push = entry->old_push;
1867 tmp->last_used = jiffies;
1868 del_timer(&entry->timer);
1869 lec_arp_put(entry);
1870 entry = tmp;
1871 } else {
1872 entry->status = ESI_FORWARD_DIRECT;
1873 ether_addr_copy(entry->mac_addr,
1874 mac_addr);
1875 entry->last_used = jiffies;
1876 lec_arp_add(priv, entry);
1877 }
1878 if (remoteflag)
1879 entry->flags |= LEC_REMOTE_FLAG;
1880 else
1881 entry->flags &= ~LEC_REMOTE_FLAG;
1882 pr_debug("After update\n");
1883 dump_arp_table(priv);
1884 goto out;
1885 }
1886 }
1887 }
1888
1889 entry = lec_arp_find(priv, mac_addr);
1890 if (!entry) {
1891 entry = make_entry(priv, mac_addr);
1892 if (!entry)
1893 goto out;
1894 entry->status = ESI_UNKNOWN;
1895 lec_arp_add(priv, entry);
1896 /* Temporary, changes before end of function */
1897 }
1898 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1899 del_timer(&entry->timer);
1900 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1901 hlist_for_each_entry(tmp,
1902 &priv->lec_arp_tables[i], next) {
1903 if (entry != tmp &&
1904 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1905 /* Vcc to this host exists */
1906 if (tmp->status > ESI_VC_PENDING) {
1907 /*
1908 * ESI_FLUSH_PENDING,
1909 * ESI_FORWARD_DIRECT
1910 */
1911 entry->vcc = tmp->vcc;
1912 entry->old_push = tmp->old_push;
1913 }
1914 entry->status = tmp->status;
1915 break;
1916 }
1917 }
1918 }
1919 if (remoteflag)
1920 entry->flags |= LEC_REMOTE_FLAG;
1921 else
1922 entry->flags &= ~LEC_REMOTE_FLAG;
1923 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1924 entry->status = ESI_VC_PENDING;
1925 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1926 }
1927 pr_debug("After update2\n");
1928 dump_arp_table(priv);
1929 out:
1930 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1931 }
1932
1933 /*
1934 * Notifies: Vcc setup ready
1935 */
1936 static void
1937 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1938 struct atm_vcc *vcc,
1939 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1940 {
1941 unsigned long flags;
1942 struct lec_arp_table *entry;
1943 int i, found_entry = 0;
1944
1945 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1946 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1947 if (ioc_data->receive == 2) {
1948 pr_debug("LEC_ARP: Attaching mcast forward\n");
1949 #if 0
1950 entry = lec_arp_find(priv, bus_mac);
1951 if (!entry) {
1952 pr_info("LEC_ARP: Multicast entry not found!\n");
1953 goto out;
1954 }
1955 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1956 entry->recv_vcc = vcc;
1957 entry->old_recv_push = old_push;
1958 #endif
1959 entry = make_entry(priv, bus_mac);
1960 if (entry == NULL)
1961 goto out;
1962 del_timer(&entry->timer);
1963 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1964 entry->recv_vcc = vcc;
1965 entry->old_recv_push = old_push;
1966 hlist_add_head(&entry->next, &priv->mcast_fwds);
1967 goto out;
1968 } else if (ioc_data->receive == 1) {
1969 /*
1970 * Vcc which we don't want to make default vcc,
1971 * attach it anyway.
1972 */
1973 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",
1974 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1975 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1976 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1977 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1978 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1979 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1980 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1981 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1982 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1983 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1984 entry = make_entry(priv, bus_mac);
1985 if (entry == NULL)
1986 goto out;
1987 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1988 eth_zero_addr(entry->mac_addr);
1989 entry->recv_vcc = vcc;
1990 entry->old_recv_push = old_push;
1991 entry->status = ESI_UNKNOWN;
1992 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1993 entry->timer.function = lec_arp_expire_vcc;
1994 hlist_add_head(&entry->next, &priv->lec_no_forward);
1995 add_timer(&entry->timer);
1996 dump_arp_table(priv);
1997 goto out;
1998 }
1999 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",
2000 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2001 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2002 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2003 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2004 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2005 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2006 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2007 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2008 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2009 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2010 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2011 hlist_for_each_entry(entry,
2012 &priv->lec_arp_tables[i], next) {
2013 if (memcmp
2014 (ioc_data->atm_addr, entry->atm_addr,
2015 ATM_ESA_LEN) == 0) {
2016 pr_debug("LEC_ARP: Attaching data direct\n");
2017 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2018 entry->vcc ? entry->vcc->vci : 0,
2019 entry->recv_vcc ? entry->recv_vcc->
2020 vci : 0);
2021 found_entry = 1;
2022 del_timer(&entry->timer);
2023 entry->vcc = vcc;
2024 entry->old_push = old_push;
2025 if (entry->status == ESI_VC_PENDING) {
2026 if (priv->maximum_unknown_frame_count
2027 == 0)
2028 entry->status =
2029 ESI_FORWARD_DIRECT;
2030 else {
2031 entry->timestamp = jiffies;
2032 entry->status =
2033 ESI_FLUSH_PENDING;
2034 #if 0
2035 send_to_lecd(priv, l_flush_xmt,
2036 NULL,
2037 entry->atm_addr,
2038 NULL);
2039 #endif
2040 }
2041 } else {
2042 /*
2043 * They were forming a connection
2044 * to us, and we to them. Our
2045 * ATM address is numerically lower
2046 * than theirs, so we make connection
2047 * we formed into default VCC (8.1.11).
2048 * Connection they made gets torn
2049 * down. This might confuse some
2050 * clients. Can be changed if
2051 * someone reports trouble...
2052 */
2053 ;
2054 }
2055 }
2056 }
2057 }
2058 if (found_entry) {
2059 pr_debug("After vcc was added\n");
2060 dump_arp_table(priv);
2061 goto out;
2062 }
2063 /*
2064 * Not found, snatch address from first data packet that arrives
2065 * from this vcc
2066 */
2067 entry = make_entry(priv, bus_mac);
2068 if (!entry)
2069 goto out;
2070 entry->vcc = vcc;
2071 entry->old_push = old_push;
2072 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2073 eth_zero_addr(entry->mac_addr);
2074 entry->status = ESI_UNKNOWN;
2075 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2076 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2077 entry->timer.function = lec_arp_expire_vcc;
2078 add_timer(&entry->timer);
2079 pr_debug("After vcc was added\n");
2080 dump_arp_table(priv);
2081 out:
2082 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2083 }
2084
2085 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2086 {
2087 unsigned long flags;
2088 struct lec_arp_table *entry;
2089 int i;
2090
2091 pr_debug("%lx\n", tran_id);
2092 restart:
2093 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2094 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2095 hlist_for_each_entry(entry,
2096 &priv->lec_arp_tables[i], next) {
2097 if (entry->flush_tran_id == tran_id &&
2098 entry->status == ESI_FLUSH_PENDING) {
2099 struct sk_buff *skb;
2100 struct atm_vcc *vcc = entry->vcc;
2101
2102 lec_arp_hold(entry);
2103 spin_unlock_irqrestore(&priv->lec_arp_lock,
2104 flags);
2105 while ((skb = skb_dequeue(&entry->tx_wait)))
2106 lec_send(vcc, skb);
2107 entry->last_used = jiffies;
2108 entry->status = ESI_FORWARD_DIRECT;
2109 lec_arp_put(entry);
2110 pr_debug("LEC_ARP: Flushed\n");
2111 goto restart;
2112 }
2113 }
2114 }
2115 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2116 dump_arp_table(priv);
2117 }
2118
2119 static void
2120 lec_set_flush_tran_id(struct lec_priv *priv,
2121 const unsigned char *atm_addr, unsigned long tran_id)
2122 {
2123 unsigned long flags;
2124 struct lec_arp_table *entry;
2125 int i;
2126
2127 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2128 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2129 hlist_for_each_entry(entry,
2130 &priv->lec_arp_tables[i], next) {
2131 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2132 entry->flush_tran_id = tran_id;
2133 pr_debug("Set flush transaction id to %lx for %p\n",
2134 tran_id, entry);
2135 }
2136 }
2137 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2138 }
2139
2140 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2141 {
2142 unsigned long flags;
2143 unsigned char mac_addr[] = {
2144 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2145 };
2146 struct lec_arp_table *to_add;
2147 struct lec_vcc_priv *vpriv;
2148 int err = 0;
2149
2150 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2151 if (!vpriv)
2152 return -ENOMEM;
2153 vpriv->xoff = 0;
2154 vpriv->old_pop = vcc->pop;
2155 vcc->user_back = vpriv;
2156 vcc->pop = lec_pop;
2157 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2158 to_add = make_entry(priv, mac_addr);
2159 if (!to_add) {
2160 vcc->pop = vpriv->old_pop;
2161 kfree(vpriv);
2162 err = -ENOMEM;
2163 goto out;
2164 }
2165 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2166 to_add->status = ESI_FORWARD_DIRECT;
2167 to_add->flags |= LEC_PERMANENT_FLAG;
2168 to_add->vcc = vcc;
2169 to_add->old_push = vcc->push;
2170 vcc->push = lec_push;
2171 priv->mcast_vcc = vcc;
2172 lec_arp_add(priv, to_add);
2173 out:
2174 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2175 return err;
2176 }
2177
2178 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2179 {
2180 unsigned long flags;
2181 struct hlist_node *next;
2182 struct lec_arp_table *entry;
2183 int i;
2184
2185 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2186 dump_arp_table(priv);
2187
2188 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2189
2190 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2191 hlist_for_each_entry_safe(entry, next,
2192 &priv->lec_arp_tables[i], next) {
2193 if (vcc == entry->vcc) {
2194 lec_arp_remove(priv, entry);
2195 lec_arp_put(entry);
2196 if (priv->mcast_vcc == vcc)
2197 priv->mcast_vcc = NULL;
2198 }
2199 }
2200 }
2201
2202 hlist_for_each_entry_safe(entry, next,
2203 &priv->lec_arp_empty_ones, next) {
2204 if (entry->vcc == vcc) {
2205 lec_arp_clear_vccs(entry);
2206 del_timer(&entry->timer);
2207 hlist_del(&entry->next);
2208 lec_arp_put(entry);
2209 }
2210 }
2211
2212 hlist_for_each_entry_safe(entry, next,
2213 &priv->lec_no_forward, next) {
2214 if (entry->recv_vcc == vcc) {
2215 lec_arp_clear_vccs(entry);
2216 del_timer(&entry->timer);
2217 hlist_del(&entry->next);
2218 lec_arp_put(entry);
2219 }
2220 }
2221
2222 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2223 if (entry->recv_vcc == vcc) {
2224 lec_arp_clear_vccs(entry);
2225 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2226 hlist_del(&entry->next);
2227 lec_arp_put(entry);
2228 }
2229 }
2230
2231 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2232 dump_arp_table(priv);
2233 }
2234
2235 static void
2236 lec_arp_check_empties(struct lec_priv *priv,
2237 struct atm_vcc *vcc, struct sk_buff *skb)
2238 {
2239 unsigned long flags;
2240 struct hlist_node *next;
2241 struct lec_arp_table *entry, *tmp;
2242 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2243 unsigned char *src = hdr->h_source;
2244
2245 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2246 hlist_for_each_entry_safe(entry, next,
2247 &priv->lec_arp_empty_ones, next) {
2248 if (vcc == entry->vcc) {
2249 del_timer(&entry->timer);
2250 ether_addr_copy(entry->mac_addr, src);
2251 entry->status = ESI_FORWARD_DIRECT;
2252 entry->last_used = jiffies;
2253 /* We might have got an entry */
2254 tmp = lec_arp_find(priv, src);
2255 if (tmp) {
2256 lec_arp_remove(priv, tmp);
2257 lec_arp_put(tmp);
2258 }
2259 hlist_del(&entry->next);
2260 lec_arp_add(priv, entry);
2261 goto out;
2262 }
2263 }
2264 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2265 out:
2266 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2267 }
2268
2269 MODULE_LICENSE("GPL");
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