1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * lec.c: Lan Emulation driver
4  *
5  * Marko Kiiskila <mkiiskila@yahoo.com>
6  */
7 
8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
9 
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/bitops.h>
13 #include <linux/capability.h>
14 
15 /* We are ethernet device */
16 #include <linux/if_ether.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <net/sock.h>
20 #include <linux/skbuff.h>
21 #include <linux/ip.h>
22 #include <asm/byteorder.h>
23 #include <linux/uaccess.h>
24 #include <net/arp.h>
25 #include <net/dst.h>
26 #include <linux/proc_fs.h>
27 #include <linux/spinlock.h>
28 #include <linux/seq_file.h>
29 
30 /* And atm device */
31 #include <linux/atmdev.h>
32 #include <linux/atmlec.h>
33 
34 /* Proxy LEC knows about bridging */
35 #if IS_ENABLED(CONFIG_BRIDGE)
36 #include "../bridge/br_private.h"
37 
38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
39 #endif
40 
41 /* Modular too */
42 #include <linux/module.h>
43 #include <linux/init.h>
44 
45 /* Hardening for Spectre-v1 */
46 #include <linux/nospec.h>
47 
48 #include "lec.h"
49 #include "lec_arpc.h"
50 #include "resources.h"
51 
52 #define DUMP_PACKETS 0		/*
53 				 * 0 = None,
54 				 * 1 = 30 first bytes
55 				 * 2 = Whole packet
56 				 */
57 
58 #define LEC_UNRES_QUE_LEN 8	/*
59 				 * number of tx packets to queue for a
60 				 * single destination while waiting for SVC
61 				 */
62 
63 static int lec_open(struct net_device *dev);
64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
65 				  struct net_device *dev);
66 static int lec_close(struct net_device *dev);
67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
68 					  const unsigned char *mac_addr);
69 static int lec_arp_remove(struct lec_priv *priv,
70 			  struct lec_arp_table *to_remove);
71 /* LANE2 functions */
72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
73 				const u8 *tlvs, u32 sizeoftlvs);
74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
75 			 u8 **tlvs, u32 *sizeoftlvs);
76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
77 			       const u8 *tlvs, u32 sizeoftlvs);
78 
79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
80 			   unsigned long permanent);
81 static void lec_arp_check_empties(struct lec_priv *priv,
82 				  struct atm_vcc *vcc, struct sk_buff *skb);
83 static void lec_arp_destroy(struct lec_priv *priv);
84 static void lec_arp_init(struct lec_priv *priv);
85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
86 				       const unsigned char *mac_to_find,
87 				       int is_rdesc,
88 				       struct lec_arp_table **ret_entry);
89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
90 			   const unsigned char *atm_addr,
91 			   unsigned long remoteflag,
92 			   unsigned int targetless_le_arp);
93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
95 static void lec_set_flush_tran_id(struct lec_priv *priv,
96 				  const unsigned char *atm_addr,
97 				  unsigned long tran_id);
98 static void lec_vcc_added(struct lec_priv *priv,
99 			  const struct atmlec_ioc *ioc_data,
100 			  struct atm_vcc *vcc,
101 			  void (*old_push)(struct atm_vcc *vcc,
102 					   struct sk_buff *skb));
103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
104 
105 /* must be done under lec_arp_lock */
lec_arp_hold(struct lec_arp_table * entry)106 static inline void lec_arp_hold(struct lec_arp_table *entry)
107 {
108 	refcount_inc(&entry->usage);
109 }
110 
lec_arp_put(struct lec_arp_table * entry)111 static inline void lec_arp_put(struct lec_arp_table *entry)
112 {
113 	if (refcount_dec_and_test(&entry->usage))
114 		kfree(entry);
115 }
116 
117 static struct lane2_ops lane2_ops = {
118 	.resolve = lane2_resolve,		/* spec 3.1.3 */
119 	.associate_req = lane2_associate_req,	/* spec 3.1.4 */
120 	.associate_indicator = NULL             /* spec 3.1.5 */
121 };
122 
123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
124 
125 /* Device structures */
126 static struct net_device *dev_lec[MAX_LEC_ITF];
127 
128 #if IS_ENABLED(CONFIG_BRIDGE)
lec_handle_bridge(struct sk_buff * skb,struct net_device * dev)129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
130 {
131 	char *buff;
132 	struct lec_priv *priv;
133 
134 	/*
135 	 * Check if this is a BPDU. If so, ask zeppelin to send
136 	 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
137 	 * as the Config BPDU has
138 	 */
139 	buff = skb->data + skb->dev->hard_header_len;
140 	if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
141 		struct sock *sk;
142 		struct sk_buff *skb2;
143 		struct atmlec_msg *mesg;
144 
145 		skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
146 		if (skb2 == NULL)
147 			return;
148 		skb2->len = sizeof(struct atmlec_msg);
149 		mesg = (struct atmlec_msg *)skb2->data;
150 		mesg->type = l_topology_change;
151 		buff += 4;
152 		mesg->content.normal.flag = *buff & 0x01;
153 					/* 0x01 is topology change */
154 
155 		priv = netdev_priv(dev);
156 		atm_force_charge(priv->lecd, skb2->truesize);
157 		sk = sk_atm(priv->lecd);
158 		skb_queue_tail(&sk->sk_receive_queue, skb2);
159 		sk->sk_data_ready(sk);
160 	}
161 }
162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
163 
164 /*
165  * Open/initialize the netdevice. This is called (in the current kernel)
166  * sometime after booting when the 'ifconfig' program is run.
167  *
168  * This routine should set everything up anew at each open, even
169  * registers that "should" only need to be set once at boot, so that
170  * there is non-reboot way to recover if something goes wrong.
171  */
172 
lec_open(struct net_device * dev)173 static int lec_open(struct net_device *dev)
174 {
175 	netif_start_queue(dev);
176 
177 	return 0;
178 }
179 
180 static void
lec_send(struct atm_vcc * vcc,struct sk_buff * skb)181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
182 {
183 	struct net_device *dev = skb->dev;
184 
185 	ATM_SKB(skb)->vcc = vcc;
186 	atm_account_tx(vcc, skb);
187 
188 	if (vcc->send(vcc, skb) < 0) {
189 		dev->stats.tx_dropped++;
190 		return;
191 	}
192 
193 	dev->stats.tx_packets++;
194 	dev->stats.tx_bytes += skb->len;
195 }
196 
lec_tx_timeout(struct net_device * dev,unsigned int txqueue)197 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
198 {
199 	pr_info("%s\n", dev->name);
200 	netif_trans_update(dev);
201 	netif_wake_queue(dev);
202 }
203 
lec_start_xmit(struct sk_buff * skb,struct net_device * dev)204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
205 				  struct net_device *dev)
206 {
207 	struct sk_buff *skb2;
208 	struct lec_priv *priv = netdev_priv(dev);
209 	struct lecdatahdr_8023 *lec_h;
210 	struct atm_vcc *vcc;
211 	struct lec_arp_table *entry;
212 	unsigned char *dst;
213 	int min_frame_size;
214 	int is_rdesc;
215 
216 	pr_debug("called\n");
217 	if (!priv->lecd) {
218 		pr_info("%s:No lecd attached\n", dev->name);
219 		dev->stats.tx_errors++;
220 		netif_stop_queue(dev);
221 		kfree_skb(skb);
222 		return NETDEV_TX_OK;
223 	}
224 
225 	pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
226 		 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
227 		 (long)skb_end_pointer(skb));
228 #if IS_ENABLED(CONFIG_BRIDGE)
229 	if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
230 		lec_handle_bridge(skb, dev);
231 #endif
232 
233 	/* Make sure we have room for lec_id */
234 	if (skb_headroom(skb) < 2) {
235 		pr_debug("reallocating skb\n");
236 		skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
237 		if (unlikely(!skb2)) {
238 			kfree_skb(skb);
239 			return NETDEV_TX_OK;
240 		}
241 		consume_skb(skb);
242 		skb = skb2;
243 	}
244 	skb_push(skb, 2);
245 
246 	/* Put le header to place */
247 	lec_h = (struct lecdatahdr_8023 *)skb->data;
248 	lec_h->le_header = htons(priv->lecid);
249 
250 #if DUMP_PACKETS >= 2
251 #define MAX_DUMP_SKB 99
252 #elif DUMP_PACKETS >= 1
253 #define MAX_DUMP_SKB 30
254 #endif
255 #if DUMP_PACKETS >= 1
256 	printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
257 	       dev->name, skb->len, priv->lecid);
258 	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
259 		       skb->data, min(skb->len, MAX_DUMP_SKB), true);
260 #endif /* DUMP_PACKETS >= 1 */
261 
262 	/* Minimum ethernet-frame size */
263 	min_frame_size = LEC_MINIMUM_8023_SIZE;
264 	if (skb->len < min_frame_size) {
265 		if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
266 			skb2 = skb_copy_expand(skb, 0,
267 					       min_frame_size - skb->truesize,
268 					       GFP_ATOMIC);
269 			dev_kfree_skb(skb);
270 			if (skb2 == NULL) {
271 				dev->stats.tx_dropped++;
272 				return NETDEV_TX_OK;
273 			}
274 			skb = skb2;
275 		}
276 		skb_put(skb, min_frame_size - skb->len);
277 	}
278 
279 	/* Send to right vcc */
280 	is_rdesc = 0;
281 	dst = lec_h->h_dest;
282 	entry = NULL;
283 	vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
284 	pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
285 		 dev->name, vcc, vcc ? vcc->flags : 0, entry);
286 	if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
287 		if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
288 			pr_debug("%s:queuing packet, MAC address %pM\n",
289 				 dev->name, lec_h->h_dest);
290 			skb_queue_tail(&entry->tx_wait, skb);
291 		} else {
292 			pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
293 				 dev->name, lec_h->h_dest);
294 			dev->stats.tx_dropped++;
295 			dev_kfree_skb(skb);
296 		}
297 		goto out;
298 	}
299 #if DUMP_PACKETS > 0
300 	printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
301 	       dev->name, vcc->vpi, vcc->vci);
302 #endif /* DUMP_PACKETS > 0 */
303 
304 	while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
305 		pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
306 		lec_send(vcc, skb2);
307 	}
308 
309 	lec_send(vcc, skb);
310 
311 	if (!atm_may_send(vcc, 0)) {
312 		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
313 
314 		vpriv->xoff = 1;
315 		netif_stop_queue(dev);
316 
317 		/*
318 		 * vcc->pop() might have occurred in between, making
319 		 * the vcc usuable again.  Since xmit is serialized,
320 		 * this is the only situation we have to re-test.
321 		 */
322 
323 		if (atm_may_send(vcc, 0))
324 			netif_wake_queue(dev);
325 	}
326 
327 out:
328 	if (entry)
329 		lec_arp_put(entry);
330 	netif_trans_update(dev);
331 	return NETDEV_TX_OK;
332 }
333 
334 /* The inverse routine to net_open(). */
lec_close(struct net_device * dev)335 static int lec_close(struct net_device *dev)
336 {
337 	netif_stop_queue(dev);
338 	return 0;
339 }
340 
lec_atm_send(struct atm_vcc * vcc,struct sk_buff * skb)341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
342 {
343 	static const u8 zero_addr[ETH_ALEN] = {};
344 	unsigned long flags;
345 	struct net_device *dev = (struct net_device *)vcc->proto_data;
346 	struct lec_priv *priv = netdev_priv(dev);
347 	struct atmlec_msg *mesg;
348 	struct lec_arp_table *entry;
349 	char *tmp;		/* FIXME */
350 
351 	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
352 	mesg = (struct atmlec_msg *)skb->data;
353 	tmp = skb->data;
354 	tmp += sizeof(struct atmlec_msg);
355 	pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
356 	switch (mesg->type) {
357 	case l_set_mac_addr:
358 		eth_hw_addr_set(dev, mesg->content.normal.mac_addr);
359 		break;
360 	case l_del_mac_addr:
361 		eth_hw_addr_set(dev, zero_addr);
362 		break;
363 	case l_addr_delete:
364 		lec_addr_delete(priv, mesg->content.normal.atm_addr,
365 				mesg->content.normal.flag);
366 		break;
367 	case l_topology_change:
368 		priv->topology_change = mesg->content.normal.flag;
369 		break;
370 	case l_flush_complete:
371 		lec_flush_complete(priv, mesg->content.normal.flag);
372 		break;
373 	case l_narp_req:	/* LANE2: see 7.1.35 in the lane2 spec */
374 		spin_lock_irqsave(&priv->lec_arp_lock, flags);
375 		entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
376 		lec_arp_remove(priv, entry);
377 		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
378 
379 		if (mesg->content.normal.no_source_le_narp)
380 			break;
381 		fallthrough;
382 	case l_arp_update:
383 		lec_arp_update(priv, mesg->content.normal.mac_addr,
384 			       mesg->content.normal.atm_addr,
385 			       mesg->content.normal.flag,
386 			       mesg->content.normal.targetless_le_arp);
387 		pr_debug("in l_arp_update\n");
388 		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
389 			pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
390 				 mesg->sizeoftlvs);
391 			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
392 					    tmp, mesg->sizeoftlvs);
393 		}
394 		break;
395 	case l_config:
396 		priv->maximum_unknown_frame_count =
397 		    mesg->content.config.maximum_unknown_frame_count;
398 		priv->max_unknown_frame_time =
399 		    (mesg->content.config.max_unknown_frame_time * HZ);
400 		priv->max_retry_count = mesg->content.config.max_retry_count;
401 		priv->aging_time = (mesg->content.config.aging_time * HZ);
402 		priv->forward_delay_time =
403 		    (mesg->content.config.forward_delay_time * HZ);
404 		priv->arp_response_time =
405 		    (mesg->content.config.arp_response_time * HZ);
406 		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
407 		priv->path_switching_delay =
408 		    (mesg->content.config.path_switching_delay * HZ);
409 		priv->lane_version = mesg->content.config.lane_version;
410 					/* LANE2 */
411 		priv->lane2_ops = NULL;
412 		if (priv->lane_version > 1)
413 			priv->lane2_ops = &lane2_ops;
414 		rtnl_lock();
415 		if (dev_set_mtu(dev, mesg->content.config.mtu))
416 			pr_info("%s: change_mtu to %d failed\n",
417 				dev->name, mesg->content.config.mtu);
418 		rtnl_unlock();
419 		priv->is_proxy = mesg->content.config.is_proxy;
420 		break;
421 	case l_flush_tran_id:
422 		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
423 				      mesg->content.normal.flag);
424 		break;
425 	case l_set_lecid:
426 		priv->lecid =
427 		    (unsigned short)(0xffff & mesg->content.normal.flag);
428 		break;
429 	case l_should_bridge:
430 #if IS_ENABLED(CONFIG_BRIDGE)
431 	{
432 		pr_debug("%s: bridge zeppelin asks about %pM\n",
433 			 dev->name, mesg->content.proxy.mac_addr);
434 
435 		if (br_fdb_test_addr_hook == NULL)
436 			break;
437 
438 		if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
439 			/* hit from bridge table, send LE_ARP_RESPONSE */
440 			struct sk_buff *skb2;
441 			struct sock *sk;
442 
443 			pr_debug("%s: entry found, responding to zeppelin\n",
444 				 dev->name);
445 			skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
446 			if (skb2 == NULL)
447 				break;
448 			skb2->len = sizeof(struct atmlec_msg);
449 			skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
450 			atm_force_charge(priv->lecd, skb2->truesize);
451 			sk = sk_atm(priv->lecd);
452 			skb_queue_tail(&sk->sk_receive_queue, skb2);
453 			sk->sk_data_ready(sk);
454 		}
455 	}
456 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
457 		break;
458 	default:
459 		pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
460 		dev_kfree_skb(skb);
461 		return -EINVAL;
462 	}
463 	dev_kfree_skb(skb);
464 	return 0;
465 }
466 
lec_atm_close(struct atm_vcc * vcc)467 static void lec_atm_close(struct atm_vcc *vcc)
468 {
469 	struct sk_buff *skb;
470 	struct net_device *dev = (struct net_device *)vcc->proto_data;
471 	struct lec_priv *priv = netdev_priv(dev);
472 
473 	priv->lecd = NULL;
474 	/* Do something needful? */
475 
476 	netif_stop_queue(dev);
477 	lec_arp_destroy(priv);
478 
479 	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
480 		pr_info("%s closing with messages pending\n", dev->name);
481 	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
482 		atm_return(vcc, skb->truesize);
483 		dev_kfree_skb(skb);
484 	}
485 
486 	pr_info("%s: Shut down!\n", dev->name);
487 	module_put(THIS_MODULE);
488 }
489 
490 static const struct atmdev_ops lecdev_ops = {
491 	.close = lec_atm_close,
492 	.send = lec_atm_send
493 };
494 
495 static struct atm_dev lecatm_dev = {
496 	.ops = &lecdev_ops,
497 	.type = "lec",
498 	.number = 999,		/* dummy device number */
499 	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
500 };
501 
502 /*
503  * LANE2: new argument struct sk_buff *data contains
504  * the LE_ARP based TLVs introduced in the LANE2 spec
505  */
506 static int
send_to_lecd(struct lec_priv * priv,atmlec_msg_type type,const unsigned char * mac_addr,const unsigned char * atm_addr,struct sk_buff * data)507 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
508 	     const unsigned char *mac_addr, const unsigned char *atm_addr,
509 	     struct sk_buff *data)
510 {
511 	struct sock *sk;
512 	struct sk_buff *skb;
513 	struct atmlec_msg *mesg;
514 
515 	if (!priv || !priv->lecd)
516 		return -1;
517 	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
518 	if (!skb)
519 		return -1;
520 	skb->len = sizeof(struct atmlec_msg);
521 	mesg = (struct atmlec_msg *)skb->data;
522 	memset(mesg, 0, sizeof(struct atmlec_msg));
523 	mesg->type = type;
524 	if (data != NULL)
525 		mesg->sizeoftlvs = data->len;
526 	if (mac_addr)
527 		ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
528 	else
529 		mesg->content.normal.targetless_le_arp = 1;
530 	if (atm_addr)
531 		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
532 
533 	atm_force_charge(priv->lecd, skb->truesize);
534 	sk = sk_atm(priv->lecd);
535 	skb_queue_tail(&sk->sk_receive_queue, skb);
536 	sk->sk_data_ready(sk);
537 
538 	if (data != NULL) {
539 		pr_debug("about to send %d bytes of data\n", data->len);
540 		atm_force_charge(priv->lecd, data->truesize);
541 		skb_queue_tail(&sk->sk_receive_queue, data);
542 		sk->sk_data_ready(sk);
543 	}
544 
545 	return 0;
546 }
547 
lec_set_multicast_list(struct net_device * dev)548 static void lec_set_multicast_list(struct net_device *dev)
549 {
550 	/*
551 	 * by default, all multicast frames arrive over the bus.
552 	 * eventually support selective multicast service
553 	 */
554 }
555 
556 static const struct net_device_ops lec_netdev_ops = {
557 	.ndo_open		= lec_open,
558 	.ndo_stop		= lec_close,
559 	.ndo_start_xmit		= lec_start_xmit,
560 	.ndo_tx_timeout		= lec_tx_timeout,
561 	.ndo_set_rx_mode	= lec_set_multicast_list,
562 };
563 
564 static const unsigned char lec_ctrl_magic[] = {
565 	0xff,
566 	0x00,
567 	0x01,
568 	0x01
569 };
570 
571 #define LEC_DATA_DIRECT_8023  2
572 #define LEC_DATA_DIRECT_8025  3
573 
lec_is_data_direct(struct atm_vcc * vcc)574 static int lec_is_data_direct(struct atm_vcc *vcc)
575 {
576 	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
577 		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
578 }
579 
lec_push(struct atm_vcc * vcc,struct sk_buff * skb)580 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
581 {
582 	unsigned long flags;
583 	struct net_device *dev = (struct net_device *)vcc->proto_data;
584 	struct lec_priv *priv = netdev_priv(dev);
585 
586 #if DUMP_PACKETS > 0
587 	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
588 	       dev->name, vcc->vpi, vcc->vci);
589 #endif
590 	if (!skb) {
591 		pr_debug("%s: null skb\n", dev->name);
592 		lec_vcc_close(priv, vcc);
593 		return;
594 	}
595 #if DUMP_PACKETS >= 2
596 #define MAX_SKB_DUMP 99
597 #elif DUMP_PACKETS >= 1
598 #define MAX_SKB_DUMP 30
599 #endif
600 #if DUMP_PACKETS > 0
601 	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
602 	       dev->name, skb->len, priv->lecid);
603 	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
604 		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
605 #endif /* DUMP_PACKETS > 0 */
606 	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
607 				/* Control frame, to daemon */
608 		struct sock *sk = sk_atm(vcc);
609 
610 		pr_debug("%s: To daemon\n", dev->name);
611 		skb_queue_tail(&sk->sk_receive_queue, skb);
612 		sk->sk_data_ready(sk);
613 	} else {		/* Data frame, queue to protocol handlers */
614 		struct lec_arp_table *entry;
615 		unsigned char *src, *dst;
616 
617 		atm_return(vcc, skb->truesize);
618 		if (*(__be16 *) skb->data == htons(priv->lecid) ||
619 		    !priv->lecd || !(dev->flags & IFF_UP)) {
620 			/*
621 			 * Probably looping back, or if lecd is missing,
622 			 * lecd has gone down
623 			 */
624 			pr_debug("Ignoring frame...\n");
625 			dev_kfree_skb(skb);
626 			return;
627 		}
628 		dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
629 
630 		/*
631 		 * If this is a Data Direct VCC, and the VCC does not match
632 		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
633 		 */
634 		spin_lock_irqsave(&priv->lec_arp_lock, flags);
635 		if (lec_is_data_direct(vcc)) {
636 			src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
637 			entry = lec_arp_find(priv, src);
638 			if (entry && entry->vcc != vcc) {
639 				lec_arp_remove(priv, entry);
640 				lec_arp_put(entry);
641 			}
642 		}
643 		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
644 
645 		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
646 		    !priv->is_proxy &&	/* Proxy wants all the packets */
647 		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
648 			dev_kfree_skb(skb);
649 			return;
650 		}
651 		if (!hlist_empty(&priv->lec_arp_empty_ones))
652 			lec_arp_check_empties(priv, vcc, skb);
653 		skb_pull(skb, 2);	/* skip lec_id */
654 		skb->protocol = eth_type_trans(skb, dev);
655 		dev->stats.rx_packets++;
656 		dev->stats.rx_bytes += skb->len;
657 		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
658 		netif_rx(skb);
659 	}
660 }
661 
lec_pop(struct atm_vcc * vcc,struct sk_buff * skb)662 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
663 {
664 	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
665 	struct net_device *dev = skb->dev;
666 
667 	if (vpriv == NULL) {
668 		pr_info("vpriv = NULL!?!?!?\n");
669 		return;
670 	}
671 
672 	vpriv->old_pop(vcc, skb);
673 
674 	if (vpriv->xoff && atm_may_send(vcc, 0)) {
675 		vpriv->xoff = 0;
676 		if (netif_running(dev) && netif_queue_stopped(dev))
677 			netif_wake_queue(dev);
678 	}
679 }
680 
lec_vcc_attach(struct atm_vcc * vcc,void __user * arg)681 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
682 {
683 	struct lec_vcc_priv *vpriv;
684 	int bytes_left;
685 	struct atmlec_ioc ioc_data;
686 
687 	/* Lecd must be up in this case */
688 	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
689 	if (bytes_left != 0)
690 		pr_info("copy from user failed for %d bytes\n", bytes_left);
691 	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
692 		return -EINVAL;
693 	ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
694 	if (!dev_lec[ioc_data.dev_num])
695 		return -EINVAL;
696 	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
697 	if (!vpriv)
698 		return -ENOMEM;
699 	vpriv->xoff = 0;
700 	vpriv->old_pop = vcc->pop;
701 	vcc->user_back = vpriv;
702 	vcc->pop = lec_pop;
703 	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
704 		      &ioc_data, vcc, vcc->push);
705 	vcc->proto_data = dev_lec[ioc_data.dev_num];
706 	vcc->push = lec_push;
707 	return 0;
708 }
709 
lec_mcast_attach(struct atm_vcc * vcc,int arg)710 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
711 {
712 	if (arg < 0 || arg >= MAX_LEC_ITF)
713 		return -EINVAL;
714 	arg = array_index_nospec(arg, MAX_LEC_ITF);
715 	if (!dev_lec[arg])
716 		return -EINVAL;
717 	vcc->proto_data = dev_lec[arg];
718 	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
719 }
720 
721 /* Initialize device. */
lecd_attach(struct atm_vcc * vcc,int arg)722 static int lecd_attach(struct atm_vcc *vcc, int arg)
723 {
724 	int i;
725 	struct lec_priv *priv;
726 
727 	if (arg < 0)
728 		arg = 0;
729 	if (arg >= MAX_LEC_ITF)
730 		return -EINVAL;
731 	i = array_index_nospec(arg, MAX_LEC_ITF);
732 	if (!dev_lec[i]) {
733 		int size;
734 
735 		size = sizeof(struct lec_priv);
736 		dev_lec[i] = alloc_etherdev(size);
737 		if (!dev_lec[i])
738 			return -ENOMEM;
739 		dev_lec[i]->netdev_ops = &lec_netdev_ops;
740 		dev_lec[i]->max_mtu = 18190;
741 		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
742 		if (register_netdev(dev_lec[i])) {
743 			free_netdev(dev_lec[i]);
744 			return -EINVAL;
745 		}
746 
747 		priv = netdev_priv(dev_lec[i]);
748 	} else {
749 		priv = netdev_priv(dev_lec[i]);
750 		if (priv->lecd)
751 			return -EADDRINUSE;
752 	}
753 	lec_arp_init(priv);
754 	priv->itfnum = i;	/* LANE2 addition */
755 	priv->lecd = vcc;
756 	vcc->dev = &lecatm_dev;
757 	vcc_insert_socket(sk_atm(vcc));
758 
759 	vcc->proto_data = dev_lec[i];
760 	set_bit(ATM_VF_META, &vcc->flags);
761 	set_bit(ATM_VF_READY, &vcc->flags);
762 
763 	/* Set default values to these variables */
764 	priv->maximum_unknown_frame_count = 1;
765 	priv->max_unknown_frame_time = (1 * HZ);
766 	priv->vcc_timeout_period = (1200 * HZ);
767 	priv->max_retry_count = 1;
768 	priv->aging_time = (300 * HZ);
769 	priv->forward_delay_time = (15 * HZ);
770 	priv->topology_change = 0;
771 	priv->arp_response_time = (1 * HZ);
772 	priv->flush_timeout = (4 * HZ);
773 	priv->path_switching_delay = (6 * HZ);
774 
775 	if (dev_lec[i]->flags & IFF_UP)
776 		netif_start_queue(dev_lec[i]);
777 	__module_get(THIS_MODULE);
778 	return i;
779 }
780 
781 #ifdef CONFIG_PROC_FS
lec_arp_get_status_string(unsigned char status)782 static const char *lec_arp_get_status_string(unsigned char status)
783 {
784 	static const char *const lec_arp_status_string[] = {
785 		"ESI_UNKNOWN       ",
786 		"ESI_ARP_PENDING   ",
787 		"ESI_VC_PENDING    ",
788 		"<Undefined>       ",
789 		"ESI_FLUSH_PENDING ",
790 		"ESI_FORWARD_DIRECT"
791 	};
792 
793 	if (status > ESI_FORWARD_DIRECT)
794 		status = 3;	/* ESI_UNDEFINED */
795 	return lec_arp_status_string[status];
796 }
797 
lec_info(struct seq_file * seq,struct lec_arp_table * entry)798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
799 {
800 	seq_printf(seq, "%pM ", entry->mac_addr);
801 	seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
802 	seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
803 		   entry->flags & 0xffff);
804 	if (entry->vcc)
805 		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
806 	else
807 		seq_printf(seq, "        ");
808 	if (entry->recv_vcc) {
809 		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
810 			   entry->recv_vcc->vci);
811 	}
812 	seq_putc(seq, '\n');
813 }
814 
815 struct lec_state {
816 	unsigned long flags;
817 	struct lec_priv *locked;
818 	struct hlist_node *node;
819 	struct net_device *dev;
820 	int itf;
821 	int arp_table;
822 	int misc_table;
823 };
824 
lec_tbl_walk(struct lec_state * state,struct hlist_head * tbl,loff_t * l)825 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
826 			  loff_t *l)
827 {
828 	struct hlist_node *e = state->node;
829 
830 	if (!e)
831 		e = tbl->first;
832 	if (e == SEQ_START_TOKEN) {
833 		e = tbl->first;
834 		--*l;
835 	}
836 
837 	for (; e; e = e->next) {
838 		if (--*l < 0)
839 			break;
840 	}
841 	state->node = e;
842 
843 	return (*l < 0) ? state : NULL;
844 }
845 
lec_arp_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)846 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
847 			  struct lec_priv *priv)
848 {
849 	void *v = NULL;
850 	int p;
851 
852 	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
853 		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
854 		if (v)
855 			break;
856 	}
857 	state->arp_table = p;
858 	return v;
859 }
860 
lec_misc_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)861 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
862 			   struct lec_priv *priv)
863 {
864 	struct hlist_head *lec_misc_tables[] = {
865 		&priv->lec_arp_empty_ones,
866 		&priv->lec_no_forward,
867 		&priv->mcast_fwds
868 	};
869 	void *v = NULL;
870 	int q;
871 
872 	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
873 		v = lec_tbl_walk(state, lec_misc_tables[q], l);
874 		if (v)
875 			break;
876 	}
877 	state->misc_table = q;
878 	return v;
879 }
880 
lec_priv_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)881 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
882 			   struct lec_priv *priv)
883 {
884 	if (!state->locked) {
885 		state->locked = priv;
886 		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
887 	}
888 	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
889 		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
890 		state->locked = NULL;
891 		/* Partial state reset for the next time we get called */
892 		state->arp_table = state->misc_table = 0;
893 	}
894 	return state->locked;
895 }
896 
lec_itf_walk(struct lec_state * state,loff_t * l)897 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
898 {
899 	struct net_device *dev;
900 	void *v;
901 
902 	dev = state->dev ? state->dev : dev_lec[state->itf];
903 	v = (dev && netdev_priv(dev)) ?
904 		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
905 	if (!v && dev) {
906 		dev_put(dev);
907 		/* Partial state reset for the next time we get called */
908 		dev = NULL;
909 	}
910 	state->dev = dev;
911 	return v;
912 }
913 
lec_get_idx(struct lec_state * state,loff_t l)914 static void *lec_get_idx(struct lec_state *state, loff_t l)
915 {
916 	void *v = NULL;
917 
918 	for (; state->itf < MAX_LEC_ITF; state->itf++) {
919 		v = lec_itf_walk(state, &l);
920 		if (v)
921 			break;
922 	}
923 	return v;
924 }
925 
lec_seq_start(struct seq_file * seq,loff_t * pos)926 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
927 {
928 	struct lec_state *state = seq->private;
929 
930 	state->itf = 0;
931 	state->dev = NULL;
932 	state->locked = NULL;
933 	state->arp_table = 0;
934 	state->misc_table = 0;
935 	state->node = SEQ_START_TOKEN;
936 
937 	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
938 }
939 
lec_seq_stop(struct seq_file * seq,void * v)940 static void lec_seq_stop(struct seq_file *seq, void *v)
941 {
942 	struct lec_state *state = seq->private;
943 
944 	if (state->dev) {
945 		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
946 				       state->flags);
947 		dev_put(state->dev);
948 	}
949 }
950 
lec_seq_next(struct seq_file * seq,void * v,loff_t * pos)951 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
952 {
953 	struct lec_state *state = seq->private;
954 
955 	++*pos;
956 	return lec_get_idx(state, 1);
957 }
958 
lec_seq_show(struct seq_file * seq,void * v)959 static int lec_seq_show(struct seq_file *seq, void *v)
960 {
961 	static const char lec_banner[] =
962 	    "Itf  MAC          ATM destination"
963 	    "                          Status            Flags "
964 	    "VPI/VCI Recv VPI/VCI\n";
965 
966 	if (v == SEQ_START_TOKEN)
967 		seq_puts(seq, lec_banner);
968 	else {
969 		struct lec_state *state = seq->private;
970 		struct net_device *dev = state->dev;
971 		struct lec_arp_table *entry = hlist_entry(state->node,
972 							  struct lec_arp_table,
973 							  next);
974 
975 		seq_printf(seq, "%s ", dev->name);
976 		lec_info(seq, entry);
977 	}
978 	return 0;
979 }
980 
981 static const struct seq_operations lec_seq_ops = {
982 	.start = lec_seq_start,
983 	.next = lec_seq_next,
984 	.stop = lec_seq_stop,
985 	.show = lec_seq_show,
986 };
987 #endif
988 
lane_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)989 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
990 {
991 	struct atm_vcc *vcc = ATM_SD(sock);
992 	int err = 0;
993 
994 	switch (cmd) {
995 	case ATMLEC_CTRL:
996 	case ATMLEC_MCAST:
997 	case ATMLEC_DATA:
998 		if (!capable(CAP_NET_ADMIN))
999 			return -EPERM;
1000 		break;
1001 	default:
1002 		return -ENOIOCTLCMD;
1003 	}
1004 
1005 	switch (cmd) {
1006 	case ATMLEC_CTRL:
1007 		err = lecd_attach(vcc, (int)arg);
1008 		if (err >= 0)
1009 			sock->state = SS_CONNECTED;
1010 		break;
1011 	case ATMLEC_MCAST:
1012 		err = lec_mcast_attach(vcc, (int)arg);
1013 		break;
1014 	case ATMLEC_DATA:
1015 		err = lec_vcc_attach(vcc, (void __user *)arg);
1016 		break;
1017 	}
1018 
1019 	return err;
1020 }
1021 
1022 static struct atm_ioctl lane_ioctl_ops = {
1023 	.owner = THIS_MODULE,
1024 	.ioctl = lane_ioctl,
1025 };
1026 
lane_module_init(void)1027 static int __init lane_module_init(void)
1028 {
1029 #ifdef CONFIG_PROC_FS
1030 	struct proc_dir_entry *p;
1031 
1032 	p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1033 			sizeof(struct lec_state), NULL);
1034 	if (!p) {
1035 		pr_err("Unable to initialize /proc/net/atm/lec\n");
1036 		return -ENOMEM;
1037 	}
1038 #endif
1039 
1040 	register_atm_ioctl(&lane_ioctl_ops);
1041 	pr_info("lec.c: initialized\n");
1042 	return 0;
1043 }
1044 
lane_module_cleanup(void)1045 static void __exit lane_module_cleanup(void)
1046 {
1047 	int i;
1048 
1049 #ifdef CONFIG_PROC_FS
1050 	remove_proc_entry("lec", atm_proc_root);
1051 #endif
1052 
1053 	deregister_atm_ioctl(&lane_ioctl_ops);
1054 
1055 	for (i = 0; i < MAX_LEC_ITF; i++) {
1056 		if (dev_lec[i] != NULL) {
1057 			unregister_netdev(dev_lec[i]);
1058 			free_netdev(dev_lec[i]);
1059 			dev_lec[i] = NULL;
1060 		}
1061 	}
1062 }
1063 
1064 module_init(lane_module_init);
1065 module_exit(lane_module_cleanup);
1066 
1067 /*
1068  * LANE2: 3.1.3, LE_RESOLVE.request
1069  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1070  * If sizeoftlvs == NULL the default TLVs associated with this
1071  * lec will be used.
1072  * If dst_mac == NULL, targetless LE_ARP will be sent
1073  */
lane2_resolve(struct net_device * dev,const u8 * dst_mac,int force,u8 ** tlvs,u32 * sizeoftlvs)1074 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1075 			 u8 **tlvs, u32 *sizeoftlvs)
1076 {
1077 	unsigned long flags;
1078 	struct lec_priv *priv = netdev_priv(dev);
1079 	struct lec_arp_table *table;
1080 	struct sk_buff *skb;
1081 	int retval;
1082 
1083 	if (force == 0) {
1084 		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1085 		table = lec_arp_find(priv, dst_mac);
1086 		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1087 		if (table == NULL)
1088 			return -1;
1089 
1090 		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1091 		if (*tlvs == NULL)
1092 			return -1;
1093 
1094 		*sizeoftlvs = table->sizeoftlvs;
1095 
1096 		return 0;
1097 	}
1098 
1099 	if (sizeoftlvs == NULL)
1100 		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1101 
1102 	else {
1103 		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1104 		if (skb == NULL)
1105 			return -1;
1106 		skb->len = *sizeoftlvs;
1107 		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1108 		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1109 	}
1110 	return retval;
1111 }
1112 
1113 /*
1114  * LANE2: 3.1.4, LE_ASSOCIATE.request
1115  * Associate the *tlvs with the *lan_dst address.
1116  * Will overwrite any previous association
1117  * Returns 1 for success, 0 for failure (out of memory)
1118  *
1119  */
lane2_associate_req(struct net_device * dev,const u8 * lan_dst,const u8 * tlvs,u32 sizeoftlvs)1120 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1121 			       const u8 *tlvs, u32 sizeoftlvs)
1122 {
1123 	int retval;
1124 	struct sk_buff *skb;
1125 	struct lec_priv *priv = netdev_priv(dev);
1126 
1127 	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1128 		return 0;	/* not our mac address */
1129 
1130 	kfree(priv->tlvs);	/* NULL if there was no previous association */
1131 
1132 	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1133 	if (priv->tlvs == NULL)
1134 		return 0;
1135 	priv->sizeoftlvs = sizeoftlvs;
1136 
1137 	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1138 	if (skb == NULL)
1139 		return 0;
1140 	skb->len = sizeoftlvs;
1141 	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1142 	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1143 	if (retval != 0)
1144 		pr_info("lec.c: lane2_associate_req() failed\n");
1145 	/*
1146 	 * If the previous association has changed we must
1147 	 * somehow notify other LANE entities about the change
1148 	 */
1149 	return 1;
1150 }
1151 
1152 /*
1153  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1154  *
1155  */
lane2_associate_ind(struct net_device * dev,const u8 * mac_addr,const u8 * tlvs,u32 sizeoftlvs)1156 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1157 				const u8 *tlvs, u32 sizeoftlvs)
1158 {
1159 #if 0
1160 	int i = 0;
1161 #endif
1162 	struct lec_priv *priv = netdev_priv(dev);
1163 #if 0				/*
1164 				 * Why have the TLVs in LE_ARP entries
1165 				 * since we do not use them? When you
1166 				 * uncomment this code, make sure the
1167 				 * TLVs get freed when entry is killed
1168 				 */
1169 	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1170 
1171 	if (entry == NULL)
1172 		return;		/* should not happen */
1173 
1174 	kfree(entry->tlvs);
1175 
1176 	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1177 	if (entry->tlvs == NULL)
1178 		return;
1179 	entry->sizeoftlvs = sizeoftlvs;
1180 #endif
1181 #if 0
1182 	pr_info("\n");
1183 	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1184 	while (i < sizeoftlvs)
1185 		pr_cont("%02x ", tlvs[i++]);
1186 
1187 	pr_cont("\n");
1188 #endif
1189 
1190 	/* tell MPOA about the TLVs we saw */
1191 	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1192 		priv->lane2_ops->associate_indicator(dev, mac_addr,
1193 						     tlvs, sizeoftlvs);
1194 	}
1195 }
1196 
1197 /*
1198  * Here starts what used to lec_arpc.c
1199  *
1200  * lec_arpc.c was added here when making
1201  * lane client modular. October 1997
1202  */
1203 
1204 #include <linux/types.h>
1205 #include <linux/timer.h>
1206 #include <linux/param.h>
1207 #include <linux/atomic.h>
1208 #include <linux/inetdevice.h>
1209 #include <net/route.h>
1210 
1211 #if 0
1212 #define pr_debug(format, args...)
1213 /*
1214   #define pr_debug printk
1215 */
1216 #endif
1217 #define DEBUG_ARP_TABLE 0
1218 
1219 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1220 
1221 static void lec_arp_check_expire(struct work_struct *work);
1222 static void lec_arp_expire_arp(struct timer_list *t);
1223 
1224 /*
1225  * Arp table funcs
1226  */
1227 
1228 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1229 
1230 /*
1231  * Initialization of arp-cache
1232  */
lec_arp_init(struct lec_priv * priv)1233 static void lec_arp_init(struct lec_priv *priv)
1234 {
1235 	unsigned short i;
1236 
1237 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1238 		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1239 	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1240 	INIT_HLIST_HEAD(&priv->lec_no_forward);
1241 	INIT_HLIST_HEAD(&priv->mcast_fwds);
1242 	spin_lock_init(&priv->lec_arp_lock);
1243 	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1244 	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1245 }
1246 
lec_arp_clear_vccs(struct lec_arp_table * entry)1247 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1248 {
1249 	if (entry->vcc) {
1250 		struct atm_vcc *vcc = entry->vcc;
1251 		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1252 		struct net_device *dev = (struct net_device *)vcc->proto_data;
1253 
1254 		vcc->pop = vpriv->old_pop;
1255 		if (vpriv->xoff)
1256 			netif_wake_queue(dev);
1257 		kfree(vpriv);
1258 		vcc->user_back = NULL;
1259 		vcc->push = entry->old_push;
1260 		vcc_release_async(vcc, -EPIPE);
1261 		entry->vcc = NULL;
1262 	}
1263 	if (entry->recv_vcc) {
1264 		struct atm_vcc *vcc = entry->recv_vcc;
1265 		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1266 
1267 		kfree(vpriv);
1268 		vcc->user_back = NULL;
1269 
1270 		entry->recv_vcc->push = entry->old_recv_push;
1271 		vcc_release_async(entry->recv_vcc, -EPIPE);
1272 		entry->recv_vcc = NULL;
1273 	}
1274 }
1275 
1276 /*
1277  * Insert entry to lec_arp_table
1278  * LANE2: Add to the end of the list to satisfy 8.1.13
1279  */
1280 static inline void
lec_arp_add(struct lec_priv * priv,struct lec_arp_table * entry)1281 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1282 {
1283 	struct hlist_head *tmp;
1284 
1285 	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1286 	hlist_add_head(&entry->next, tmp);
1287 
1288 	pr_debug("Added entry:%pM\n", entry->mac_addr);
1289 }
1290 
1291 /*
1292  * Remove entry from lec_arp_table
1293  */
1294 static int
lec_arp_remove(struct lec_priv * priv,struct lec_arp_table * to_remove)1295 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1296 {
1297 	struct lec_arp_table *entry;
1298 	int i, remove_vcc = 1;
1299 
1300 	if (!to_remove)
1301 		return -1;
1302 
1303 	hlist_del(&to_remove->next);
1304 	del_timer(&to_remove->timer);
1305 
1306 	/*
1307 	 * If this is the only MAC connected to this VCC,
1308 	 * also tear down the VCC
1309 	 */
1310 	if (to_remove->status >= ESI_FLUSH_PENDING) {
1311 		/*
1312 		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1313 		 */
1314 		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1315 			hlist_for_each_entry(entry,
1316 					     &priv->lec_arp_tables[i], next) {
1317 				if (memcmp(to_remove->atm_addr,
1318 					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1319 					remove_vcc = 0;
1320 					break;
1321 				}
1322 			}
1323 		}
1324 		if (remove_vcc)
1325 			lec_arp_clear_vccs(to_remove);
1326 	}
1327 	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1328 
1329 	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1330 	return 0;
1331 }
1332 
1333 #if DEBUG_ARP_TABLE
get_status_string(unsigned char st)1334 static const char *get_status_string(unsigned char st)
1335 {
1336 	switch (st) {
1337 	case ESI_UNKNOWN:
1338 		return "ESI_UNKNOWN";
1339 	case ESI_ARP_PENDING:
1340 		return "ESI_ARP_PENDING";
1341 	case ESI_VC_PENDING:
1342 		return "ESI_VC_PENDING";
1343 	case ESI_FLUSH_PENDING:
1344 		return "ESI_FLUSH_PENDING";
1345 	case ESI_FORWARD_DIRECT:
1346 		return "ESI_FORWARD_DIRECT";
1347 	}
1348 	return "<UNKNOWN>";
1349 }
1350 
dump_arp_table(struct lec_priv * priv)1351 static void dump_arp_table(struct lec_priv *priv)
1352 {
1353 	struct lec_arp_table *rulla;
1354 	char buf[256];
1355 	int i, offset;
1356 
1357 	pr_info("Dump %p:\n", priv);
1358 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1359 		hlist_for_each_entry(rulla,
1360 				     &priv->lec_arp_tables[i], next) {
1361 			offset = 0;
1362 			offset += sprintf(buf, "%d: %p\n", i, rulla);
1363 			offset += sprintf(buf + offset, "Mac: %pM ",
1364 					  rulla->mac_addr);
1365 			offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1366 					  rulla->atm_addr);
1367 			offset += sprintf(buf + offset,
1368 					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1369 					  rulla->vcc ? rulla->vcc->vpi : 0,
1370 					  rulla->vcc ? rulla->vcc->vci : 0,
1371 					  rulla->recv_vcc ? rulla->recv_vcc->
1372 					  vpi : 0,
1373 					  rulla->recv_vcc ? rulla->recv_vcc->
1374 					  vci : 0, rulla->last_used,
1375 					  rulla->timestamp, rulla->no_tries);
1376 			offset +=
1377 			    sprintf(buf + offset,
1378 				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1379 				    rulla->flags, rulla->packets_flooded,
1380 				    get_status_string(rulla->status));
1381 			pr_info("%s\n", buf);
1382 		}
1383 	}
1384 
1385 	if (!hlist_empty(&priv->lec_no_forward))
1386 		pr_info("No forward\n");
1387 	hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1388 		offset = 0;
1389 		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1390 		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1391 				  rulla->atm_addr);
1392 		offset += sprintf(buf + offset,
1393 				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1394 				  rulla->vcc ? rulla->vcc->vpi : 0,
1395 				  rulla->vcc ? rulla->vcc->vci : 0,
1396 				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1397 				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1398 				  rulla->last_used,
1399 				  rulla->timestamp, rulla->no_tries);
1400 		offset += sprintf(buf + offset,
1401 				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1402 				  rulla->flags, rulla->packets_flooded,
1403 				  get_status_string(rulla->status));
1404 		pr_info("%s\n", buf);
1405 	}
1406 
1407 	if (!hlist_empty(&priv->lec_arp_empty_ones))
1408 		pr_info("Empty ones\n");
1409 	hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1410 		offset = 0;
1411 		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1412 		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1413 				  rulla->atm_addr);
1414 		offset += sprintf(buf + offset,
1415 				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1416 				  rulla->vcc ? rulla->vcc->vpi : 0,
1417 				  rulla->vcc ? rulla->vcc->vci : 0,
1418 				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1419 				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1420 				  rulla->last_used,
1421 				  rulla->timestamp, rulla->no_tries);
1422 		offset += sprintf(buf + offset,
1423 				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1424 				  rulla->flags, rulla->packets_flooded,
1425 				  get_status_string(rulla->status));
1426 		pr_info("%s", buf);
1427 	}
1428 
1429 	if (!hlist_empty(&priv->mcast_fwds))
1430 		pr_info("Multicast Forward VCCs\n");
1431 	hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1432 		offset = 0;
1433 		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1434 		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1435 				  rulla->atm_addr);
1436 		offset += sprintf(buf + offset,
1437 				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1438 				  rulla->vcc ? rulla->vcc->vpi : 0,
1439 				  rulla->vcc ? rulla->vcc->vci : 0,
1440 				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1441 				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1442 				  rulla->last_used,
1443 				  rulla->timestamp, rulla->no_tries);
1444 		offset += sprintf(buf + offset,
1445 				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1446 				  rulla->flags, rulla->packets_flooded,
1447 				  get_status_string(rulla->status));
1448 		pr_info("%s\n", buf);
1449 	}
1450 
1451 }
1452 #else
1453 #define dump_arp_table(priv) do { } while (0)
1454 #endif
1455 
1456 /*
1457  * Destruction of arp-cache
1458  */
lec_arp_destroy(struct lec_priv * priv)1459 static void lec_arp_destroy(struct lec_priv *priv)
1460 {
1461 	unsigned long flags;
1462 	struct hlist_node *next;
1463 	struct lec_arp_table *entry;
1464 	int i;
1465 
1466 	cancel_delayed_work_sync(&priv->lec_arp_work);
1467 
1468 	/*
1469 	 * Remove all entries
1470 	 */
1471 
1472 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1473 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1474 		hlist_for_each_entry_safe(entry, next,
1475 					  &priv->lec_arp_tables[i], next) {
1476 			lec_arp_remove(priv, entry);
1477 			lec_arp_put(entry);
1478 		}
1479 		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1480 	}
1481 
1482 	hlist_for_each_entry_safe(entry, next,
1483 				  &priv->lec_arp_empty_ones, next) {
1484 		del_timer_sync(&entry->timer);
1485 		lec_arp_clear_vccs(entry);
1486 		hlist_del(&entry->next);
1487 		lec_arp_put(entry);
1488 	}
1489 	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1490 
1491 	hlist_for_each_entry_safe(entry, next,
1492 				  &priv->lec_no_forward, next) {
1493 		del_timer_sync(&entry->timer);
1494 		lec_arp_clear_vccs(entry);
1495 		hlist_del(&entry->next);
1496 		lec_arp_put(entry);
1497 	}
1498 	INIT_HLIST_HEAD(&priv->lec_no_forward);
1499 
1500 	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1501 		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1502 		lec_arp_clear_vccs(entry);
1503 		hlist_del(&entry->next);
1504 		lec_arp_put(entry);
1505 	}
1506 	INIT_HLIST_HEAD(&priv->mcast_fwds);
1507 	priv->mcast_vcc = NULL;
1508 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1509 }
1510 
1511 /*
1512  * Find entry by mac_address
1513  */
lec_arp_find(struct lec_priv * priv,const unsigned char * mac_addr)1514 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1515 					  const unsigned char *mac_addr)
1516 {
1517 	struct hlist_head *head;
1518 	struct lec_arp_table *entry;
1519 
1520 	pr_debug("%pM\n", mac_addr);
1521 
1522 	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1523 	hlist_for_each_entry(entry, head, next) {
1524 		if (ether_addr_equal(mac_addr, entry->mac_addr))
1525 			return entry;
1526 	}
1527 	return NULL;
1528 }
1529 
make_entry(struct lec_priv * priv,const unsigned char * mac_addr)1530 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1531 					const unsigned char *mac_addr)
1532 {
1533 	struct lec_arp_table *to_return;
1534 
1535 	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1536 	if (!to_return)
1537 		return NULL;
1538 	ether_addr_copy(to_return->mac_addr, mac_addr);
1539 	INIT_HLIST_NODE(&to_return->next);
1540 	timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1541 	to_return->last_used = jiffies;
1542 	to_return->priv = priv;
1543 	skb_queue_head_init(&to_return->tx_wait);
1544 	refcount_set(&to_return->usage, 1);
1545 	return to_return;
1546 }
1547 
1548 /* Arp sent timer expired */
lec_arp_expire_arp(struct timer_list * t)1549 static void lec_arp_expire_arp(struct timer_list *t)
1550 {
1551 	struct lec_arp_table *entry;
1552 
1553 	entry = from_timer(entry, t, timer);
1554 
1555 	pr_debug("\n");
1556 	if (entry->status == ESI_ARP_PENDING) {
1557 		if (entry->no_tries <= entry->priv->max_retry_count) {
1558 			if (entry->is_rdesc)
1559 				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1560 					     entry->mac_addr, NULL, NULL);
1561 			else
1562 				send_to_lecd(entry->priv, l_arp_xmt,
1563 					     entry->mac_addr, NULL, NULL);
1564 			entry->no_tries++;
1565 		}
1566 		mod_timer(&entry->timer, jiffies + (1 * HZ));
1567 	}
1568 }
1569 
1570 /* Unknown/unused vcc expire, remove associated entry */
lec_arp_expire_vcc(struct timer_list * t)1571 static void lec_arp_expire_vcc(struct timer_list *t)
1572 {
1573 	unsigned long flags;
1574 	struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1575 	struct lec_priv *priv = to_remove->priv;
1576 
1577 	del_timer(&to_remove->timer);
1578 
1579 	pr_debug("%p %p: vpi:%d vci:%d\n",
1580 		 to_remove, priv,
1581 		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1582 		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1583 
1584 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1585 	hlist_del(&to_remove->next);
1586 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1587 
1588 	lec_arp_clear_vccs(to_remove);
1589 	lec_arp_put(to_remove);
1590 }
1591 
__lec_arp_check_expire(struct lec_arp_table * entry,unsigned long now,struct lec_priv * priv)1592 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1593 				   unsigned long now,
1594 				   struct lec_priv *priv)
1595 {
1596 	unsigned long time_to_check;
1597 
1598 	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1599 		time_to_check = priv->forward_delay_time;
1600 	else
1601 		time_to_check = priv->aging_time;
1602 
1603 	pr_debug("About to expire: %lx - %lx > %lx\n",
1604 		 now, entry->last_used, time_to_check);
1605 	if (time_after(now, entry->last_used + time_to_check) &&
1606 	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1607 	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1608 		/* Remove entry */
1609 		pr_debug("Entry timed out\n");
1610 		lec_arp_remove(priv, entry);
1611 		lec_arp_put(entry);
1612 	} else {
1613 		/* Something else */
1614 		if ((entry->status == ESI_VC_PENDING ||
1615 		     entry->status == ESI_ARP_PENDING) &&
1616 		    time_after_eq(now, entry->timestamp +
1617 				       priv->max_unknown_frame_time)) {
1618 			entry->timestamp = jiffies;
1619 			entry->packets_flooded = 0;
1620 			if (entry->status == ESI_VC_PENDING)
1621 				send_to_lecd(priv, l_svc_setup,
1622 					     entry->mac_addr,
1623 					     entry->atm_addr,
1624 					     NULL);
1625 		}
1626 		if (entry->status == ESI_FLUSH_PENDING &&
1627 		    time_after_eq(now, entry->timestamp +
1628 				       priv->path_switching_delay)) {
1629 			lec_arp_hold(entry);
1630 			return true;
1631 		}
1632 	}
1633 
1634 	return false;
1635 }
1636 /*
1637  * Expire entries.
1638  * 1. Re-set timer
1639  * 2. For each entry, delete entries that have aged past the age limit.
1640  * 3. For each entry, depending on the status of the entry, perform
1641  *    the following maintenance.
1642  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1643  *       tick_count is above the max_unknown_frame_time, clear
1644  *       the tick_count to zero and clear the packets_flooded counter
1645  *       to zero. This supports the packet rate limit per address
1646  *       while flooding unknowns.
1647  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1648  *       than or equal to the path_switching_delay, change the status
1649  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1650  *       regardless of the progress of the flush protocol.
1651  */
lec_arp_check_expire(struct work_struct * work)1652 static void lec_arp_check_expire(struct work_struct *work)
1653 {
1654 	unsigned long flags;
1655 	struct lec_priv *priv =
1656 		container_of(work, struct lec_priv, lec_arp_work.work);
1657 	struct hlist_node *next;
1658 	struct lec_arp_table *entry;
1659 	unsigned long now;
1660 	int i;
1661 
1662 	pr_debug("%p\n", priv);
1663 	now = jiffies;
1664 restart:
1665 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1666 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1667 		hlist_for_each_entry_safe(entry, next,
1668 					  &priv->lec_arp_tables[i], next) {
1669 			if (__lec_arp_check_expire(entry, now, priv)) {
1670 				struct sk_buff *skb;
1671 				struct atm_vcc *vcc = entry->vcc;
1672 
1673 				spin_unlock_irqrestore(&priv->lec_arp_lock,
1674 						       flags);
1675 				while ((skb = skb_dequeue(&entry->tx_wait)))
1676 					lec_send(vcc, skb);
1677 				entry->last_used = jiffies;
1678 				entry->status = ESI_FORWARD_DIRECT;
1679 				lec_arp_put(entry);
1680 
1681 				goto restart;
1682 			}
1683 		}
1684 	}
1685 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1686 
1687 	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1688 }
1689 
1690 /*
1691  * Try to find vcc where mac_address is attached.
1692  *
1693  */
lec_arp_resolve(struct lec_priv * priv,const unsigned char * mac_to_find,int is_rdesc,struct lec_arp_table ** ret_entry)1694 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1695 				       const unsigned char *mac_to_find,
1696 				       int is_rdesc,
1697 				       struct lec_arp_table **ret_entry)
1698 {
1699 	unsigned long flags;
1700 	struct lec_arp_table *entry;
1701 	struct atm_vcc *found;
1702 
1703 	if (mac_to_find[0] & 0x01) {
1704 		switch (priv->lane_version) {
1705 		case 1:
1706 			return priv->mcast_vcc;
1707 		case 2:	/* LANE2 wants arp for multicast addresses */
1708 			if (ether_addr_equal(mac_to_find, bus_mac))
1709 				return priv->mcast_vcc;
1710 			break;
1711 		default:
1712 			break;
1713 		}
1714 	}
1715 
1716 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1717 	entry = lec_arp_find(priv, mac_to_find);
1718 
1719 	if (entry) {
1720 		if (entry->status == ESI_FORWARD_DIRECT) {
1721 			/* Connection Ok */
1722 			entry->last_used = jiffies;
1723 			lec_arp_hold(entry);
1724 			*ret_entry = entry;
1725 			found = entry->vcc;
1726 			goto out;
1727 		}
1728 		/*
1729 		 * If the LE_ARP cache entry is still pending, reset count to 0
1730 		 * so another LE_ARP request can be made for this frame.
1731 		 */
1732 		if (entry->status == ESI_ARP_PENDING)
1733 			entry->no_tries = 0;
1734 		/*
1735 		 * Data direct VC not yet set up, check to see if the unknown
1736 		 * frame count is greater than the limit. If the limit has
1737 		 * not been reached, allow the caller to send packet to
1738 		 * BUS.
1739 		 */
1740 		if (entry->status != ESI_FLUSH_PENDING &&
1741 		    entry->packets_flooded <
1742 		    priv->maximum_unknown_frame_count) {
1743 			entry->packets_flooded++;
1744 			pr_debug("Flooding..\n");
1745 			found = priv->mcast_vcc;
1746 			goto out;
1747 		}
1748 		/*
1749 		 * We got here because entry->status == ESI_FLUSH_PENDING
1750 		 * or BUS flood limit was reached for an entry which is
1751 		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1752 		 */
1753 		lec_arp_hold(entry);
1754 		*ret_entry = entry;
1755 		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1756 			 entry->vcc);
1757 		found = NULL;
1758 	} else {
1759 		/* No matching entry was found */
1760 		entry = make_entry(priv, mac_to_find);
1761 		pr_debug("Making entry\n");
1762 		if (!entry) {
1763 			found = priv->mcast_vcc;
1764 			goto out;
1765 		}
1766 		lec_arp_add(priv, entry);
1767 		/* We want arp-request(s) to be sent */
1768 		entry->packets_flooded = 1;
1769 		entry->status = ESI_ARP_PENDING;
1770 		entry->no_tries = 1;
1771 		entry->last_used = entry->timestamp = jiffies;
1772 		entry->is_rdesc = is_rdesc;
1773 		if (entry->is_rdesc)
1774 			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1775 				     NULL);
1776 		else
1777 			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1778 		entry->timer.expires = jiffies + (1 * HZ);
1779 		entry->timer.function = lec_arp_expire_arp;
1780 		add_timer(&entry->timer);
1781 		found = priv->mcast_vcc;
1782 	}
1783 
1784 out:
1785 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1786 	return found;
1787 }
1788 
1789 static int
lec_addr_delete(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long permanent)1790 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1791 		unsigned long permanent)
1792 {
1793 	unsigned long flags;
1794 	struct hlist_node *next;
1795 	struct lec_arp_table *entry;
1796 	int i;
1797 
1798 	pr_debug("\n");
1799 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1800 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1801 		hlist_for_each_entry_safe(entry, next,
1802 					  &priv->lec_arp_tables[i], next) {
1803 			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1804 			    (permanent ||
1805 			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1806 				lec_arp_remove(priv, entry);
1807 				lec_arp_put(entry);
1808 			}
1809 			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1810 			return 0;
1811 		}
1812 	}
1813 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1814 	return -1;
1815 }
1816 
1817 /*
1818  * Notifies:  Response to arp_request (atm_addr != NULL)
1819  */
1820 static void
lec_arp_update(struct lec_priv * priv,const unsigned char * mac_addr,const unsigned char * atm_addr,unsigned long remoteflag,unsigned int targetless_le_arp)1821 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1822 	       const unsigned char *atm_addr, unsigned long remoteflag,
1823 	       unsigned int targetless_le_arp)
1824 {
1825 	unsigned long flags;
1826 	struct hlist_node *next;
1827 	struct lec_arp_table *entry, *tmp;
1828 	int i;
1829 
1830 	pr_debug("%smac:%pM\n",
1831 		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1832 
1833 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1834 	entry = lec_arp_find(priv, mac_addr);
1835 	if (entry == NULL && targetless_le_arp)
1836 		goto out;	/*
1837 				 * LANE2: ignore targetless LE_ARPs for which
1838 				 * we have no entry in the cache. 7.1.30
1839 				 */
1840 	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1841 		hlist_for_each_entry_safe(entry, next,
1842 					  &priv->lec_arp_empty_ones, next) {
1843 			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1844 				hlist_del(&entry->next);
1845 				del_timer(&entry->timer);
1846 				tmp = lec_arp_find(priv, mac_addr);
1847 				if (tmp) {
1848 					del_timer(&tmp->timer);
1849 					tmp->status = ESI_FORWARD_DIRECT;
1850 					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1851 					tmp->vcc = entry->vcc;
1852 					tmp->old_push = entry->old_push;
1853 					tmp->last_used = jiffies;
1854 					del_timer(&entry->timer);
1855 					lec_arp_put(entry);
1856 					entry = tmp;
1857 				} else {
1858 					entry->status = ESI_FORWARD_DIRECT;
1859 					ether_addr_copy(entry->mac_addr,
1860 							mac_addr);
1861 					entry->last_used = jiffies;
1862 					lec_arp_add(priv, entry);
1863 				}
1864 				if (remoteflag)
1865 					entry->flags |= LEC_REMOTE_FLAG;
1866 				else
1867 					entry->flags &= ~LEC_REMOTE_FLAG;
1868 				pr_debug("After update\n");
1869 				dump_arp_table(priv);
1870 				goto out;
1871 			}
1872 		}
1873 	}
1874 
1875 	entry = lec_arp_find(priv, mac_addr);
1876 	if (!entry) {
1877 		entry = make_entry(priv, mac_addr);
1878 		if (!entry)
1879 			goto out;
1880 		entry->status = ESI_UNKNOWN;
1881 		lec_arp_add(priv, entry);
1882 		/* Temporary, changes before end of function */
1883 	}
1884 	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1885 	del_timer(&entry->timer);
1886 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1887 		hlist_for_each_entry(tmp,
1888 				     &priv->lec_arp_tables[i], next) {
1889 			if (entry != tmp &&
1890 			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1891 				/* Vcc to this host exists */
1892 				if (tmp->status > ESI_VC_PENDING) {
1893 					/*
1894 					 * ESI_FLUSH_PENDING,
1895 					 * ESI_FORWARD_DIRECT
1896 					 */
1897 					entry->vcc = tmp->vcc;
1898 					entry->old_push = tmp->old_push;
1899 				}
1900 				entry->status = tmp->status;
1901 				break;
1902 			}
1903 		}
1904 	}
1905 	if (remoteflag)
1906 		entry->flags |= LEC_REMOTE_FLAG;
1907 	else
1908 		entry->flags &= ~LEC_REMOTE_FLAG;
1909 	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1910 		entry->status = ESI_VC_PENDING;
1911 		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1912 	}
1913 	pr_debug("After update2\n");
1914 	dump_arp_table(priv);
1915 out:
1916 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1917 }
1918 
1919 /*
1920  * Notifies: Vcc setup ready
1921  */
1922 static void
lec_vcc_added(struct lec_priv * priv,const struct atmlec_ioc * ioc_data,struct atm_vcc * vcc,void (* old_push)(struct atm_vcc * vcc,struct sk_buff * skb))1923 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1924 	      struct atm_vcc *vcc,
1925 	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1926 {
1927 	unsigned long flags;
1928 	struct lec_arp_table *entry;
1929 	int i, found_entry = 0;
1930 
1931 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1932 	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1933 	if (ioc_data->receive == 2) {
1934 		pr_debug("LEC_ARP: Attaching mcast forward\n");
1935 #if 0
1936 		entry = lec_arp_find(priv, bus_mac);
1937 		if (!entry) {
1938 			pr_info("LEC_ARP: Multicast entry not found!\n");
1939 			goto out;
1940 		}
1941 		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1942 		entry->recv_vcc = vcc;
1943 		entry->old_recv_push = old_push;
1944 #endif
1945 		entry = make_entry(priv, bus_mac);
1946 		if (entry == NULL)
1947 			goto out;
1948 		del_timer(&entry->timer);
1949 		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1950 		entry->recv_vcc = vcc;
1951 		entry->old_recv_push = old_push;
1952 		hlist_add_head(&entry->next, &priv->mcast_fwds);
1953 		goto out;
1954 	} else if (ioc_data->receive == 1) {
1955 		/*
1956 		 * Vcc which we don't want to make default vcc,
1957 		 * attach it anyway.
1958 		 */
1959 		pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1960 			 ATM_ESA_LEN, ioc_data->atm_addr);
1961 		entry = make_entry(priv, bus_mac);
1962 		if (entry == NULL)
1963 			goto out;
1964 		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1965 		eth_zero_addr(entry->mac_addr);
1966 		entry->recv_vcc = vcc;
1967 		entry->old_recv_push = old_push;
1968 		entry->status = ESI_UNKNOWN;
1969 		entry->timer.expires = jiffies + priv->vcc_timeout_period;
1970 		entry->timer.function = lec_arp_expire_vcc;
1971 		hlist_add_head(&entry->next, &priv->lec_no_forward);
1972 		add_timer(&entry->timer);
1973 		dump_arp_table(priv);
1974 		goto out;
1975 	}
1976 	pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1977 		 ATM_ESA_LEN, ioc_data->atm_addr);
1978 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1979 		hlist_for_each_entry(entry,
1980 				     &priv->lec_arp_tables[i], next) {
1981 			if (memcmp
1982 			    (ioc_data->atm_addr, entry->atm_addr,
1983 			     ATM_ESA_LEN) == 0) {
1984 				pr_debug("LEC_ARP: Attaching data direct\n");
1985 				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1986 					 entry->vcc ? entry->vcc->vci : 0,
1987 					 entry->recv_vcc ? entry->recv_vcc->
1988 					 vci : 0);
1989 				found_entry = 1;
1990 				del_timer(&entry->timer);
1991 				entry->vcc = vcc;
1992 				entry->old_push = old_push;
1993 				if (entry->status == ESI_VC_PENDING) {
1994 					if (priv->maximum_unknown_frame_count
1995 					    == 0)
1996 						entry->status =
1997 						    ESI_FORWARD_DIRECT;
1998 					else {
1999 						entry->timestamp = jiffies;
2000 						entry->status =
2001 						    ESI_FLUSH_PENDING;
2002 #if 0
2003 						send_to_lecd(priv, l_flush_xmt,
2004 							     NULL,
2005 							     entry->atm_addr,
2006 							     NULL);
2007 #endif
2008 					}
2009 				} else {
2010 					/*
2011 					 * They were forming a connection
2012 					 * to us, and we to them. Our
2013 					 * ATM address is numerically lower
2014 					 * than theirs, so we make connection
2015 					 * we formed into default VCC (8.1.11).
2016 					 * Connection they made gets torn
2017 					 * down. This might confuse some
2018 					 * clients. Can be changed if
2019 					 * someone reports trouble...
2020 					 */
2021 					;
2022 				}
2023 			}
2024 		}
2025 	}
2026 	if (found_entry) {
2027 		pr_debug("After vcc was added\n");
2028 		dump_arp_table(priv);
2029 		goto out;
2030 	}
2031 	/*
2032 	 * Not found, snatch address from first data packet that arrives
2033 	 * from this vcc
2034 	 */
2035 	entry = make_entry(priv, bus_mac);
2036 	if (!entry)
2037 		goto out;
2038 	entry->vcc = vcc;
2039 	entry->old_push = old_push;
2040 	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2041 	eth_zero_addr(entry->mac_addr);
2042 	entry->status = ESI_UNKNOWN;
2043 	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2044 	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2045 	entry->timer.function = lec_arp_expire_vcc;
2046 	add_timer(&entry->timer);
2047 	pr_debug("After vcc was added\n");
2048 	dump_arp_table(priv);
2049 out:
2050 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2051 }
2052 
lec_flush_complete(struct lec_priv * priv,unsigned long tran_id)2053 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2054 {
2055 	unsigned long flags;
2056 	struct lec_arp_table *entry;
2057 	int i;
2058 
2059 	pr_debug("%lx\n", tran_id);
2060 restart:
2061 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2062 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2063 		hlist_for_each_entry(entry,
2064 				     &priv->lec_arp_tables[i], next) {
2065 			if (entry->flush_tran_id == tran_id &&
2066 			    entry->status == ESI_FLUSH_PENDING) {
2067 				struct sk_buff *skb;
2068 				struct atm_vcc *vcc = entry->vcc;
2069 
2070 				lec_arp_hold(entry);
2071 				spin_unlock_irqrestore(&priv->lec_arp_lock,
2072 						       flags);
2073 				while ((skb = skb_dequeue(&entry->tx_wait)))
2074 					lec_send(vcc, skb);
2075 				entry->last_used = jiffies;
2076 				entry->status = ESI_FORWARD_DIRECT;
2077 				lec_arp_put(entry);
2078 				pr_debug("LEC_ARP: Flushed\n");
2079 				goto restart;
2080 			}
2081 		}
2082 	}
2083 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2084 	dump_arp_table(priv);
2085 }
2086 
2087 static void
lec_set_flush_tran_id(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long tran_id)2088 lec_set_flush_tran_id(struct lec_priv *priv,
2089 		      const unsigned char *atm_addr, unsigned long tran_id)
2090 {
2091 	unsigned long flags;
2092 	struct lec_arp_table *entry;
2093 	int i;
2094 
2095 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2096 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2097 		hlist_for_each_entry(entry,
2098 				     &priv->lec_arp_tables[i], next) {
2099 			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2100 				entry->flush_tran_id = tran_id;
2101 				pr_debug("Set flush transaction id to %lx for %p\n",
2102 					 tran_id, entry);
2103 			}
2104 		}
2105 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2106 }
2107 
lec_mcast_make(struct lec_priv * priv,struct atm_vcc * vcc)2108 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2109 {
2110 	unsigned long flags;
2111 	unsigned char mac_addr[] = {
2112 		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2113 	};
2114 	struct lec_arp_table *to_add;
2115 	struct lec_vcc_priv *vpriv;
2116 	int err = 0;
2117 
2118 	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2119 	if (!vpriv)
2120 		return -ENOMEM;
2121 	vpriv->xoff = 0;
2122 	vpriv->old_pop = vcc->pop;
2123 	vcc->user_back = vpriv;
2124 	vcc->pop = lec_pop;
2125 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2126 	to_add = make_entry(priv, mac_addr);
2127 	if (!to_add) {
2128 		vcc->pop = vpriv->old_pop;
2129 		kfree(vpriv);
2130 		err = -ENOMEM;
2131 		goto out;
2132 	}
2133 	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2134 	to_add->status = ESI_FORWARD_DIRECT;
2135 	to_add->flags |= LEC_PERMANENT_FLAG;
2136 	to_add->vcc = vcc;
2137 	to_add->old_push = vcc->push;
2138 	vcc->push = lec_push;
2139 	priv->mcast_vcc = vcc;
2140 	lec_arp_add(priv, to_add);
2141 out:
2142 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2143 	return err;
2144 }
2145 
lec_vcc_close(struct lec_priv * priv,struct atm_vcc * vcc)2146 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2147 {
2148 	unsigned long flags;
2149 	struct hlist_node *next;
2150 	struct lec_arp_table *entry;
2151 	int i;
2152 
2153 	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2154 	dump_arp_table(priv);
2155 
2156 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2157 
2158 	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2159 		hlist_for_each_entry_safe(entry, next,
2160 					  &priv->lec_arp_tables[i], next) {
2161 			if (vcc == entry->vcc) {
2162 				lec_arp_remove(priv, entry);
2163 				lec_arp_put(entry);
2164 				if (priv->mcast_vcc == vcc)
2165 					priv->mcast_vcc = NULL;
2166 			}
2167 		}
2168 	}
2169 
2170 	hlist_for_each_entry_safe(entry, next,
2171 				  &priv->lec_arp_empty_ones, next) {
2172 		if (entry->vcc == vcc) {
2173 			lec_arp_clear_vccs(entry);
2174 			del_timer(&entry->timer);
2175 			hlist_del(&entry->next);
2176 			lec_arp_put(entry);
2177 		}
2178 	}
2179 
2180 	hlist_for_each_entry_safe(entry, next,
2181 				  &priv->lec_no_forward, next) {
2182 		if (entry->recv_vcc == vcc) {
2183 			lec_arp_clear_vccs(entry);
2184 			del_timer(&entry->timer);
2185 			hlist_del(&entry->next);
2186 			lec_arp_put(entry);
2187 		}
2188 	}
2189 
2190 	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2191 		if (entry->recv_vcc == vcc) {
2192 			lec_arp_clear_vccs(entry);
2193 			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2194 			hlist_del(&entry->next);
2195 			lec_arp_put(entry);
2196 		}
2197 	}
2198 
2199 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2200 	dump_arp_table(priv);
2201 }
2202 
2203 static void
lec_arp_check_empties(struct lec_priv * priv,struct atm_vcc * vcc,struct sk_buff * skb)2204 lec_arp_check_empties(struct lec_priv *priv,
2205 		      struct atm_vcc *vcc, struct sk_buff *skb)
2206 {
2207 	unsigned long flags;
2208 	struct hlist_node *next;
2209 	struct lec_arp_table *entry, *tmp;
2210 	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2211 	unsigned char *src = hdr->h_source;
2212 
2213 	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2214 	hlist_for_each_entry_safe(entry, next,
2215 				  &priv->lec_arp_empty_ones, next) {
2216 		if (vcc == entry->vcc) {
2217 			del_timer(&entry->timer);
2218 			ether_addr_copy(entry->mac_addr, src);
2219 			entry->status = ESI_FORWARD_DIRECT;
2220 			entry->last_used = jiffies;
2221 			/* We might have got an entry */
2222 			tmp = lec_arp_find(priv, src);
2223 			if (tmp) {
2224 				lec_arp_remove(priv, tmp);
2225 				lec_arp_put(tmp);
2226 			}
2227 			hlist_del(&entry->next);
2228 			lec_arp_add(priv, entry);
2229 			goto out;
2230 		}
2231 	}
2232 	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2233 out:
2234 	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2235 }
2236 
2237 MODULE_LICENSE("GPL");
2238