xref: /openbmc/linux/net/atm/mpc.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 #include <linux/kernel.h>
2 #include <linux/string.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
5 #include <linux/bitops.h>
6 #include <linux/seq_file.h>
7 
8 /* We are an ethernet device */
9 #include <linux/if_ether.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <net/sock.h>
13 #include <linux/skbuff.h>
14 #include <linux/ip.h>
15 #include <asm/byteorder.h>
16 #include <asm/uaccess.h>
17 #include <net/checksum.h>   /* for ip_fast_csum() */
18 #include <net/arp.h>
19 #include <net/dst.h>
20 #include <linux/proc_fs.h>
21 
22 /* And atm device */
23 #include <linux/atmdev.h>
24 #include <linux/atmlec.h>
25 #include <linux/atmmpc.h>
26 /* Modular too */
27 #include <linux/config.h>
28 #include <linux/module.h>
29 
30 #include "lec.h"
31 #include "mpc.h"
32 #include "resources.h"
33 
34 /*
35  * mpc.c: Implementation of MPOA client kernel part
36  */
37 
38 #if 0
39 #define dprintk printk   /* debug */
40 #else
41 #define dprintk(format,args...)
42 #endif
43 
44 #if 0
45 #define ddprintk printk  /* more debug */
46 #else
47 #define ddprintk(format,args...)
48 #endif
49 
50 
51 
52 #define MPOA_TAG_LEN 4
53 
54 /* mpc_daemon -> kernel */
55 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64 
65 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
66 			  uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
67 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
68 
69 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
70 static void mpoad_close(struct atm_vcc *vcc);
71 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
72 
73 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
74 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
75 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
76 static void mpc_timer_refresh(void);
77 static void mpc_cache_check( unsigned long checking_time  );
78 
79 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
80 	0xaa, 0xaa, 0x03,
81 	{0x00, 0x00, 0x5e},
82 	{0x00, 0x03}         /* For MPOA control PDUs */
83 };
84 static struct llc_snap_hdr llc_snap_mpoa_data = {
85 	0xaa, 0xaa, 0x03,
86 	{0x00, 0x00, 0x00},
87 	{0x08, 0x00}         /* This is for IP PDUs only */
88 };
89 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
90 	0xaa, 0xaa, 0x03,
91 	{0x00, 0x00, 0x00},
92 	{0x88, 0x4c}         /* This is for tagged data PDUs */
93 };
94 
95 static struct notifier_block mpoa_notifier = {
96 	mpoa_event_listener,
97 	NULL,
98 	0
99 };
100 
101 #ifdef CONFIG_PROC_FS
102 extern int mpc_proc_init(void);
103 extern void mpc_proc_clean(void);
104 #endif
105 
106 struct mpoa_client *mpcs = NULL; /* FIXME */
107 static struct atm_mpoa_qos *qos_head = NULL;
108 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
109 
110 
111 static struct mpoa_client *find_mpc_by_itfnum(int itf)
112 {
113 	struct mpoa_client *mpc;
114 
115 	mpc = mpcs;  /* our global linked list */
116 	while (mpc != NULL) {
117 		if (mpc->dev_num == itf)
118 			return mpc;
119 		mpc = mpc->next;
120 	}
121 
122 	return NULL;   /* not found */
123 }
124 
125 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
126 {
127 	struct mpoa_client *mpc;
128 
129 	mpc = mpcs;  /* our global linked list */
130 	while (mpc != NULL) {
131 		if (mpc->mpoad_vcc == vcc)
132 			return mpc;
133 		mpc = mpc->next;
134 	}
135 
136 	return NULL;   /* not found */
137 }
138 
139 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
140 {
141 	struct mpoa_client *mpc;
142 
143 	mpc = mpcs;  /* our global linked list */
144 	while (mpc != NULL) {
145 		if (mpc->dev == dev)
146 			return mpc;
147 		mpc = mpc->next;
148 	}
149 
150 	return NULL;   /* not found */
151 }
152 
153 /*
154  * Functions for managing QoS list
155  */
156 
157 /*
158  * Overwrites the old entry or makes a new one.
159  */
160 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
161 {
162 	struct atm_mpoa_qos *entry;
163 
164 	entry = atm_mpoa_search_qos(dst_ip);
165 	if (entry != NULL) {
166 		entry->qos = *qos;
167 		return entry;
168 	}
169 
170 	entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
171 	if (entry == NULL) {
172 		printk("mpoa: atm_mpoa_add_qos: out of memory\n");
173 		return entry;
174 	}
175 
176 	entry->ipaddr = dst_ip;
177 	entry->qos = *qos;
178 
179 	entry->next = qos_head;
180 	qos_head = entry;
181 
182 	return entry;
183 }
184 
185 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
186 {
187 	struct atm_mpoa_qos *qos;
188 
189 	qos = qos_head;
190 	while( qos != NULL ){
191 		if(qos->ipaddr == dst_ip) {
192 			break;
193 		}
194 		qos = qos->next;
195 	}
196 
197 	return qos;
198 }
199 
200 /*
201  * Returns 0 for failure
202  */
203 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
204 {
205 
206 	struct atm_mpoa_qos *curr;
207 
208 	if (entry == NULL) return 0;
209 	if (entry == qos_head) {
210 		qos_head = qos_head->next;
211 		kfree(entry);
212 		return 1;
213 	}
214 
215 	curr = qos_head;
216 	while (curr != NULL) {
217 		if (curr->next == entry) {
218 			curr->next = entry->next;
219 			kfree(entry);
220 			return 1;
221 		}
222 		curr = curr->next;
223 	}
224 
225 	return 0;
226 }
227 
228 /* this is buggered - we need locking for qos_head */
229 void atm_mpoa_disp_qos(struct seq_file *m)
230 {
231 	unsigned char *ip;
232 	char ipaddr[16];
233 	struct atm_mpoa_qos *qos;
234 
235 	qos = qos_head;
236 	seq_printf(m, "QoS entries for shortcuts:\n");
237 	seq_printf(m, "IP address\n  TX:max_pcr pcr     min_pcr max_cdv max_sdu\n  RX:max_pcr pcr     min_pcr max_cdv max_sdu\n");
238 
239 	ipaddr[sizeof(ipaddr)-1] = '\0';
240 	while (qos != NULL) {
241 		ip = (unsigned char *)&qos->ipaddr;
242 		sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
243 		seq_printf(m, "%u.%u.%u.%u\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
244 				NIPQUAD(ipaddr),
245 				qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
246 				qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
247 		qos = qos->next;
248 	}
249 }
250 
251 static struct net_device *find_lec_by_itfnum(int itf)
252 {
253 	struct net_device *dev;
254 	char name[IFNAMSIZ];
255 
256 	sprintf(name, "lec%d", itf);
257 	dev = dev_get_by_name(name);
258 
259 	return dev;
260 }
261 
262 static struct mpoa_client *alloc_mpc(void)
263 {
264 	struct mpoa_client *mpc;
265 
266 	mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
267 	if (mpc == NULL)
268 		return NULL;
269 	memset(mpc, 0, sizeof(struct mpoa_client));
270 	rwlock_init(&mpc->ingress_lock);
271 	rwlock_init(&mpc->egress_lock);
272 	mpc->next = mpcs;
273 	atm_mpoa_init_cache(mpc);
274 
275 	mpc->parameters.mpc_p1 = MPC_P1;
276 	mpc->parameters.mpc_p2 = MPC_P2;
277 	memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
278 	mpc->parameters.mpc_p4 = MPC_P4;
279 	mpc->parameters.mpc_p5 = MPC_P5;
280 	mpc->parameters.mpc_p6 = MPC_P6;
281 
282 	mpcs = mpc;
283 
284 	return mpc;
285 }
286 
287 /*
288  *
289  * start_mpc() puts the MPC on line. All the packets destined
290  * to the lec underneath us are now being monitored and
291  * shortcuts will be established.
292  *
293  */
294 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
295 {
296 
297 	dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
298 	if (dev->hard_start_xmit == NULL) {
299 		printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
300 		       dev->name);
301 		return;
302 	}
303 	mpc->old_hard_start_xmit = dev->hard_start_xmit;
304 	dev->hard_start_xmit = mpc_send_packet;
305 
306 	return;
307 }
308 
309 static void stop_mpc(struct mpoa_client *mpc)
310 {
311 
312 	dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
313 
314 	/* Lets not nullify lec device's dev->hard_start_xmit */
315 	if (mpc->dev->hard_start_xmit != mpc_send_packet) {
316 		dprintk(" mpc already stopped, not fatal\n");
317 		return;
318 	}
319 	dprintk("\n");
320 	mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
321 	mpc->old_hard_start_xmit = NULL;
322 	/* close_shortcuts(mpc);    ??? FIXME */
323 
324 	return;
325 }
326 
327 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
328 
329 static const char *mpoa_device_type_string(char type)
330 {
331 	switch(type) {
332 	case NON_MPOA:
333 		return "non-MPOA device";
334 		break;
335 	case MPS:
336 		return "MPS";
337 		break;
338 	case MPC:
339 		return "MPC";
340 		break;
341 	case MPS_AND_MPC:
342 		return "both MPS and MPC";
343 		break;
344 	default:
345 		return "unspecified (non-MPOA) device";
346 		break;
347 	}
348 
349 	return ""; /* not reached */
350 }
351 
352 /*
353  * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
354  * when it sees a TLV in LE_ARP packet.
355  * We fill in the pointer above when we see a LANE2 lec initializing
356  * See LANE2 spec 3.1.5
357  *
358  * Quite a big and ugly function but when you look at it
359  * all it does is to try to locate and parse MPOA Device
360  * Type TLV.
361  * We give our lec a pointer to this function and when the
362  * lec sees a TLV it uses the pointer to call this function.
363  *
364  */
365 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
366 			    uint8_t *tlvs, uint32_t sizeoftlvs)
367 {
368 	uint32_t type;
369 	uint8_t length, mpoa_device_type, number_of_mps_macs;
370 	uint8_t *end_of_tlvs;
371 	struct mpoa_client *mpc;
372 
373 	mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
374 	dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
375 	dprintk("total length of all TLVs %d\n", sizeoftlvs);
376 	mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
377 	if (mpc == NULL) {
378 		printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
379 		return;
380 	}
381 	end_of_tlvs = tlvs + sizeoftlvs;
382 	while (end_of_tlvs - tlvs >= 5) {
383 		type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
384 		length = tlvs[4];
385 		tlvs += 5;
386 		dprintk("    type 0x%x length %02x\n", type, length);
387 		if (tlvs + length > end_of_tlvs) {
388 			printk("TLV value extends past its buffer, aborting parse\n");
389 			return;
390 		}
391 
392 		if (type == 0) {
393 			printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
394 			return;
395 		}
396 
397 		if (type != TLV_MPOA_DEVICE_TYPE) {
398 			tlvs += length;
399 			continue;  /* skip other TLVs */
400 		}
401 		mpoa_device_type = *tlvs++;
402 		number_of_mps_macs = *tlvs++;
403 		dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
404 		if (mpoa_device_type == MPS_AND_MPC &&
405 		    length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
406 			printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
407 			       dev->name);
408 			continue;
409 		}
410 		if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
411 		    && length < 22 + number_of_mps_macs*ETH_ALEN) {
412 			printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
413 				dev->name);
414 			continue;
415 		}
416 		if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
417 			dprintk("ignoring non-MPS device\n");
418 			if (mpoa_device_type == MPC) tlvs += 20;
419 			continue;  /* we are only interested in MPSs */
420 		}
421 		if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
422 			printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
423 			continue;  /* someone should read the spec */
424 		}
425 		dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
426 
427 		/* ok, now we can go and tell our daemon the control address of MPS */
428 		send_set_mps_ctrl_addr(tlvs, mpc);
429 
430 		tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
431 		if (tlvs == NULL) return;
432 	}
433 	if (end_of_tlvs - tlvs != 0)
434 		printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
435 		       dev->name, end_of_tlvs - tlvs);
436 	return;
437 }
438 
439 /*
440  * Store at least advertizing router's MAC address
441  * plus the possible MAC address(es) to mpc->mps_macs.
442  * For a freshly allocated MPOA client mpc->mps_macs == 0.
443  */
444 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
445 			  uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
446 {
447 	int num_macs;
448 	num_macs = (mps_macs > 1) ? mps_macs : 1;
449 
450 	if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
451 		if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
452 		mpc->number_of_mps_macs = 0;
453 		mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
454 		if (mpc->mps_macs == NULL) {
455 			printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
456 			return NULL;
457 		}
458 	}
459 	memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
460 	tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
461 	if (mps_macs > 0)
462 		memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
463 	tlvs += mps_macs*ETH_ALEN;
464 	mpc->number_of_mps_macs = num_macs;
465 
466 	return tlvs;
467 }
468 
469 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
470 {
471 	in_cache_entry *entry;
472 	struct iphdr *iph;
473 	char *buff;
474 	uint32_t ipaddr = 0;
475 
476 	static struct {
477 		struct llc_snap_hdr hdr;
478 		uint32_t tag;
479 	} tagged_llc_snap_hdr = {
480 		{0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
481 		0
482 	};
483 
484 	buff = skb->data + mpc->dev->hard_header_len;
485 	iph = (struct iphdr *)buff;
486 	ipaddr = iph->daddr;
487 
488 	ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
489 
490 	entry = mpc->in_ops->get(ipaddr, mpc);
491 	if (entry == NULL) {
492 		entry = mpc->in_ops->add_entry(ipaddr, mpc);
493 		if (entry != NULL) mpc->in_ops->put(entry);
494 		return 1;
495 	}
496 	if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){   /* threshold not exceeded or VCC not ready */
497 		ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
498 		mpc->in_ops->put(entry);
499 		return 1;
500 	}
501 
502 	ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
503 	/* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
504 	if (iph->ttl <= 1) {
505 		ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
506 		mpc->in_ops->put(entry);
507 		return 1;
508 	}
509 	iph->ttl--;
510 	iph->check = 0;
511 	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
512 
513 	if (entry->ctrl_info.tag != 0) {
514 		ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
515 		tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
516 		skb_pull(skb, ETH_HLEN);                       /* get rid of Eth header */
517 		skb_push(skb, sizeof(tagged_llc_snap_hdr));    /* add LLC/SNAP header   */
518 		memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
519 	} else {
520 		skb_pull(skb, ETH_HLEN);                        /* get rid of Eth header */
521 		skb_push(skb, sizeof(struct llc_snap_hdr));     /* add LLC/SNAP header + tag  */
522 		memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
523 	}
524 
525 	atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
526 	ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
527 	entry->shortcut->send(entry->shortcut, skb);
528 	entry->packets_fwded++;
529 	mpc->in_ops->put(entry);
530 
531 	return 0;
532 }
533 
534 /*
535  * Probably needs some error checks and locking, not sure...
536  */
537 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
538 {
539 	int retval;
540 	struct mpoa_client *mpc;
541 	struct ethhdr *eth;
542 	int i = 0;
543 
544 	mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
545 	if(mpc == NULL) {
546 		printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
547 		goto non_ip;
548 	}
549 
550 	eth = (struct ethhdr *)skb->data;
551 	if (eth->h_proto != htons(ETH_P_IP))
552 		goto non_ip; /* Multi-Protocol Over ATM :-) */
553 
554 	while (i < mpc->number_of_mps_macs) {
555 		if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
556 			if ( send_via_shortcut(skb, mpc) == 0 )           /* try shortcut */
557 				return 0;                                 /* success!     */
558 		i++;
559 	}
560 
561  non_ip:
562 	retval = mpc->old_hard_start_xmit(skb,dev);
563 
564 	return retval;
565 }
566 
567 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
568 {
569 	int bytes_left;
570 	struct mpoa_client *mpc;
571 	struct atmmpc_ioc ioc_data;
572 	in_cache_entry *in_entry;
573 	uint32_t  ipaddr;
574 	unsigned char *ip;
575 
576 	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
577 	if (bytes_left != 0) {
578 		printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
579 		return -EFAULT;
580 	}
581 	ipaddr = ioc_data.ipaddr;
582 	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
583 		return -EINVAL;
584 
585 	mpc = find_mpc_by_itfnum(ioc_data.dev_num);
586 	if (mpc == NULL)
587 		return -EINVAL;
588 
589 	if (ioc_data.type == MPC_SOCKET_INGRESS) {
590 		in_entry = mpc->in_ops->get(ipaddr, mpc);
591 		if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
592 			printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
593 				mpc->dev->name);
594 			if (in_entry != NULL) mpc->in_ops->put(in_entry);
595 			return -EINVAL;
596 		}
597 		ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
598 		printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
599 		       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
600 		in_entry->shortcut = vcc;
601 		mpc->in_ops->put(in_entry);
602 	} else {
603 		printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
604 	}
605 
606 	vcc->proto_data = mpc->dev;
607 	vcc->push = mpc_push;
608 
609 	return 0;
610 }
611 
612 /*
613  *
614  */
615 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
616 {
617 	struct mpoa_client *mpc;
618 	in_cache_entry *in_entry;
619 	eg_cache_entry *eg_entry;
620 
621 	mpc = find_mpc_by_lec(dev);
622 	if (mpc == NULL) {
623 		printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
624 		return;
625 	}
626 
627 	dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
628 	in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
629 	if (in_entry) {
630 		unsigned char *ip __attribute__ ((unused)) =
631 		    (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
632 		dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
633 		       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
634 		in_entry->shortcut = NULL;
635 		mpc->in_ops->put(in_entry);
636 	}
637 	eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
638 	if (eg_entry) {
639 		dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
640 		eg_entry->shortcut = NULL;
641 		mpc->eg_ops->put(eg_entry);
642 	}
643 
644 	if (in_entry == NULL && eg_entry == NULL)
645 		dprintk("mpoa: (%s) mpc_vcc_close:  unused vcc closed\n", dev->name);
646 
647 	return;
648 }
649 
650 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
651 {
652 	struct net_device *dev = (struct net_device *)vcc->proto_data;
653 	struct sk_buff *new_skb;
654 	eg_cache_entry *eg;
655 	struct mpoa_client *mpc;
656 	uint32_t tag;
657 	char *tmp;
658 
659 	ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
660 	if (skb == NULL) {
661 		dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
662 		mpc_vcc_close(vcc, dev);
663 		return;
664 	}
665 
666 	skb->dev = dev;
667 	if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
668 		struct sock *sk = sk_atm(vcc);
669 
670 		dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
671 		/* Pass control packets to daemon */
672 		skb_queue_tail(&sk->sk_receive_queue, skb);
673 		sk->sk_data_ready(sk, skb->len);
674 		return;
675 	}
676 
677 	/* data coming over the shortcut */
678 	atm_return(vcc, skb->truesize);
679 
680 	mpc = find_mpc_by_lec(dev);
681 	if (mpc == NULL) {
682 		printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
683 		return;
684 	}
685 
686 	if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
687 		ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
688 
689 	} else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
690 		printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
691 		printk("           mpc_push: non-tagged data unsupported, purging\n");
692 		dev_kfree_skb_any(skb);
693 		return;
694 	} else {
695 		printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
696 		dev_kfree_skb_any(skb);
697 		return;
698 	}
699 
700 	tmp = skb->data + sizeof(struct llc_snap_hdr);
701 	tag = *(uint32_t *)tmp;
702 
703 	eg = mpc->eg_ops->get_by_tag(tag, mpc);
704 	if (eg == NULL) {
705 		printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
706 		       dev->name,tag);
707 		purge_egress_shortcut(vcc, NULL);
708 		dev_kfree_skb_any(skb);
709 		return;
710 	}
711 
712 	/*
713 	 * See if ingress MPC is using shortcut we opened as a return channel.
714 	 * This means we have a bi-directional vcc opened by us.
715 	 */
716 	if (eg->shortcut == NULL) {
717 		eg->shortcut = vcc;
718 		printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
719 	}
720 
721 	skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
722 	new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
723 	dev_kfree_skb_any(skb);
724 	if (new_skb == NULL){
725 		mpc->eg_ops->put(eg);
726 		return;
727 	}
728 	skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */
729 	memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
730 	new_skb->protocol = eth_type_trans(new_skb, dev);
731 	new_skb->nh.raw = new_skb->data;
732 
733 	eg->latest_ip_addr = new_skb->nh.iph->saddr;
734 	eg->packets_rcvd++;
735 	mpc->eg_ops->put(eg);
736 
737 	memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
738 	netif_rx(new_skb);
739 
740 	return;
741 }
742 
743 static struct atmdev_ops mpc_ops = { /* only send is required */
744 	.close	= mpoad_close,
745 	.send	= msg_from_mpoad
746 };
747 
748 static struct atm_dev mpc_dev = {
749 	.ops	= &mpc_ops,
750 	.type	= "mpc",
751 	.number	= 42,
752 	.lock	= SPIN_LOCK_UNLOCKED
753 	/* members not explicitly initialised will be 0 */
754 };
755 
756 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
757 {
758 	struct mpoa_client *mpc;
759 	struct lec_priv *priv;
760 	int err;
761 
762 	if (mpcs == NULL) {
763 		init_timer(&mpc_timer);
764 		mpc_timer_refresh();
765 
766 		/* This lets us now how our LECs are doing */
767 		err = register_netdevice_notifier(&mpoa_notifier);
768 		if (err < 0) {
769 			del_timer(&mpc_timer);
770 			return err;
771 		}
772 	}
773 
774 	mpc = find_mpc_by_itfnum(arg);
775 	if (mpc == NULL) {
776 		dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
777 		mpc = alloc_mpc();
778 		if (mpc == NULL)
779 			return -ENOMEM;
780 		mpc->dev_num = arg;
781 		mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
782 	}
783 	if (mpc->mpoad_vcc) {
784 		printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
785 		return -EADDRINUSE;
786 	}
787 
788 	if (mpc->dev) { /* check if the lec is LANE2 capable */
789 		priv = (struct lec_priv *)mpc->dev->priv;
790 		if (priv->lane_version < 2) {
791 			dev_put(mpc->dev);
792 			mpc->dev = NULL;
793 		} else
794 			priv->lane2_ops->associate_indicator = lane2_assoc_ind;
795 	}
796 
797 	mpc->mpoad_vcc = vcc;
798 	vcc->dev = &mpc_dev;
799 	vcc_insert_socket(sk_atm(vcc));
800 	set_bit(ATM_VF_META,&vcc->flags);
801 	set_bit(ATM_VF_READY,&vcc->flags);
802 
803 	if (mpc->dev) {
804 		char empty[ATM_ESA_LEN];
805 		memset(empty, 0, ATM_ESA_LEN);
806 
807 		start_mpc(mpc, mpc->dev);
808 		/* set address if mpcd e.g. gets killed and restarted.
809 		 * If we do not do it now we have to wait for the next LE_ARP
810 		 */
811 		if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
812 			send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
813 	}
814 
815 	__module_get(THIS_MODULE);
816 	return arg;
817 }
818 
819 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
820 {
821 	struct k_message mesg;
822 
823 	memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
824 
825 	mesg.type = SET_MPS_CTRL_ADDR;
826 	memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
827 	msg_to_mpoad(&mesg, mpc);
828 
829 	return;
830 }
831 
832 static void mpoad_close(struct atm_vcc *vcc)
833 {
834 	struct mpoa_client *mpc;
835 	struct sk_buff *skb;
836 
837 	mpc = find_mpc_by_vcc(vcc);
838 	if (mpc == NULL) {
839 		printk("mpoa: mpoad_close: did not find MPC\n");
840 		return;
841 	}
842 	if (!mpc->mpoad_vcc) {
843 		printk("mpoa: mpoad_close: close for non-present mpoad\n");
844 		return;
845 	}
846 
847 	mpc->mpoad_vcc = NULL;
848 	if (mpc->dev) {
849 		struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
850 		priv->lane2_ops->associate_indicator = NULL;
851 		stop_mpc(mpc);
852 		dev_put(mpc->dev);
853 	}
854 
855 	mpc->in_ops->destroy_cache(mpc);
856 	mpc->eg_ops->destroy_cache(mpc);
857 
858 	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
859 		atm_return(vcc, skb->truesize);
860 		kfree_skb(skb);
861 	}
862 
863 	printk("mpoa: (%s) going down\n",
864 		(mpc->dev) ? mpc->dev->name : "<unknown>");
865 	module_put(THIS_MODULE);
866 
867 	return;
868 }
869 
870 /*
871  *
872  */
873 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
874 {
875 
876 	struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
877 	struct k_message *mesg = (struct k_message*)skb->data;
878 	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
879 
880 	if (mpc == NULL) {
881 		printk("mpoa: msg_from_mpoad: no mpc found\n");
882 		return 0;
883 	}
884 	dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
885 	switch(mesg->type) {
886 	case MPOA_RES_REPLY_RCVD:
887 		dprintk(" mpoa_res_reply_rcvd\n");
888 		MPOA_res_reply_rcvd(mesg, mpc);
889 		break;
890 	case MPOA_TRIGGER_RCVD:
891 		dprintk(" mpoa_trigger_rcvd\n");
892 		MPOA_trigger_rcvd(mesg, mpc);
893 		break;
894 	case INGRESS_PURGE_RCVD:
895 		dprintk(" nhrp_purge_rcvd\n");
896 		ingress_purge_rcvd(mesg, mpc);
897 		break;
898 	case EGRESS_PURGE_RCVD:
899 		dprintk(" egress_purge_reply_rcvd\n");
900 		egress_purge_rcvd(mesg, mpc);
901 		break;
902 	case MPS_DEATH:
903 		dprintk(" mps_death\n");
904 		mps_death(mesg, mpc);
905 		break;
906 	case CACHE_IMPOS_RCVD:
907 		dprintk(" cache_impos_rcvd\n");
908 		MPOA_cache_impos_rcvd(mesg, mpc);
909 		break;
910 	case SET_MPC_CTRL_ADDR:
911 		dprintk(" set_mpc_ctrl_addr\n");
912 		set_mpc_ctrl_addr_rcvd(mesg, mpc);
913 		break;
914 	case SET_MPS_MAC_ADDR:
915 		dprintk(" set_mps_mac_addr\n");
916 		set_mps_mac_addr_rcvd(mesg, mpc);
917 		break;
918 	case CLEAN_UP_AND_EXIT:
919 		dprintk(" clean_up_and_exit\n");
920 		clean_up(mesg, mpc, DIE);
921 		break;
922 	case RELOAD:
923 		dprintk(" reload\n");
924 		clean_up(mesg, mpc, RELOAD);
925 		break;
926 	case SET_MPC_PARAMS:
927 		dprintk(" set_mpc_params\n");
928 		mpc->parameters = mesg->content.params;
929 		break;
930 	default:
931 		dprintk(" unknown message %d\n", mesg->type);
932 		break;
933 	}
934 	kfree_skb(skb);
935 
936 	return 0;
937 }
938 
939 /* Remember that this function may not do things that sleep */
940 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
941 {
942 	struct sk_buff *skb;
943 	struct sock *sk;
944 
945 	if (mpc == NULL || !mpc->mpoad_vcc) {
946 		printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
947 		return -ENXIO;
948 	}
949 
950 	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
951 	if (skb == NULL)
952 		return -ENOMEM;
953 	skb_put(skb, sizeof(struct k_message));
954 	memcpy(skb->data, mesg, sizeof(struct k_message));
955 	atm_force_charge(mpc->mpoad_vcc, skb->truesize);
956 
957 	sk = sk_atm(mpc->mpoad_vcc);
958 	skb_queue_tail(&sk->sk_receive_queue, skb);
959 	sk->sk_data_ready(sk, skb->len);
960 
961 	return 0;
962 }
963 
964 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
965 {
966 	struct net_device *dev;
967 	struct mpoa_client *mpc;
968 	struct lec_priv *priv;
969 
970 	dev = (struct net_device *)dev_ptr;
971 	if (dev->name == NULL || strncmp(dev->name, "lec", 3))
972 		return NOTIFY_DONE; /* we are only interested in lec:s */
973 
974 	switch (event) {
975 	case NETDEV_REGISTER:       /* a new lec device was allocated */
976 		priv = (struct lec_priv *)dev->priv;
977 		if (priv->lane_version < 2)
978 			break;
979 		priv->lane2_ops->associate_indicator = lane2_assoc_ind;
980 		mpc = find_mpc_by_itfnum(priv->itfnum);
981 		if (mpc == NULL) {
982 			dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
983 			       dev->name);
984 			mpc = alloc_mpc();
985 			if (mpc == NULL) {
986 				printk("mpoa: mpoa_event_listener: no new mpc");
987 				break;
988 			}
989 		}
990 		mpc->dev_num = priv->itfnum;
991 		mpc->dev = dev;
992 		dev_hold(dev);
993 		dprintk("mpoa: (%s) was initialized\n", dev->name);
994 		break;
995 	case NETDEV_UNREGISTER:
996 		/* the lec device was deallocated */
997 		mpc = find_mpc_by_lec(dev);
998 		if (mpc == NULL)
999 			break;
1000 		dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1001 		stop_mpc(mpc);
1002 		dev_put(mpc->dev);
1003 		mpc->dev = NULL;
1004 		break;
1005 	case NETDEV_UP:
1006 		/* the dev was ifconfig'ed up */
1007 		mpc = find_mpc_by_lec(dev);
1008 		if (mpc == NULL)
1009 			break;
1010 		if (mpc->mpoad_vcc != NULL) {
1011 			start_mpc(mpc, dev);
1012 		}
1013 		break;
1014 	case NETDEV_DOWN:
1015 		/* the dev was ifconfig'ed down */
1016 		/* this means that the flow of packets from the
1017 		 * upper layer stops
1018 		 */
1019 		mpc = find_mpc_by_lec(dev);
1020 		if (mpc == NULL)
1021 			break;
1022 		if (mpc->mpoad_vcc != NULL) {
1023 			stop_mpc(mpc);
1024 		}
1025 		break;
1026 	case NETDEV_REBOOT:
1027 	case NETDEV_CHANGE:
1028 	case NETDEV_CHANGEMTU:
1029 	case NETDEV_CHANGEADDR:
1030 	case NETDEV_GOING_DOWN:
1031 		break;
1032 	default:
1033 		break;
1034 	}
1035 
1036 	return NOTIFY_DONE;
1037 }
1038 
1039 /*
1040  * Functions which are called after a message is received from mpcd.
1041  * Msg is reused on purpose.
1042  */
1043 
1044 
1045 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1046 {
1047 	uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1048 	in_cache_entry *entry;
1049 
1050 	entry = mpc->in_ops->get(dst_ip, mpc);
1051 	if(entry == NULL){
1052 		entry = mpc->in_ops->add_entry(dst_ip, mpc);
1053 		entry->entry_state = INGRESS_RESOLVING;
1054 		msg->type = SND_MPOA_RES_RQST;
1055 		msg->content.in_info = entry->ctrl_info;
1056 		msg_to_mpoad(msg, mpc);
1057 		do_gettimeofday(&(entry->reply_wait));
1058 		mpc->in_ops->put(entry);
1059 		return;
1060 	}
1061 
1062 	if(entry->entry_state == INGRESS_INVALID){
1063 		entry->entry_state = INGRESS_RESOLVING;
1064 		msg->type = SND_MPOA_RES_RQST;
1065 		msg->content.in_info = entry->ctrl_info;
1066 		msg_to_mpoad(msg, mpc);
1067 		do_gettimeofday(&(entry->reply_wait));
1068 		mpc->in_ops->put(entry);
1069 		return;
1070 	}
1071 
1072 	printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1073 		(mpc->dev) ? mpc->dev->name : "<unknown>");
1074 	mpc->in_ops->put(entry);
1075 	return;
1076 }
1077 
1078 /*
1079  * Things get complicated because we have to check if there's an egress
1080  * shortcut with suitable traffic parameters we could use.
1081  */
1082 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1083 {
1084 	uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1085 	unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
1086 	struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1087 	eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1088 
1089 	if(eg_entry && eg_entry->shortcut){
1090 		if(eg_entry->shortcut->qos.txtp.traffic_class &
1091 		   msg->qos.txtp.traffic_class &
1092 		   (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1093 			    if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1094 				    entry->shortcut = eg_entry->shortcut;
1095 			    else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1096 				    entry->shortcut = eg_entry->shortcut;
1097 		}
1098 	 	if(entry->shortcut){
1099 			dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(ip));
1100 			client->eg_ops->put(eg_entry);
1101 			return;
1102 		}
1103 	}
1104 	if (eg_entry != NULL)
1105 		client->eg_ops->put(eg_entry);
1106 
1107 	/* No luck in the egress cache we must open an ingress SVC */
1108 	msg->type = OPEN_INGRESS_SVC;
1109 	if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1110 	{
1111 		msg->qos = qos->qos;
1112 		printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1113     	}
1114 	else memset(&msg->qos,0,sizeof(struct atm_qos));
1115 	msg_to_mpoad(msg, client);
1116 	return;
1117 }
1118 
1119 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1120 {
1121 	unsigned char *ip;
1122 
1123 	uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1124 	in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1125 	ip = (unsigned char *)&dst_ip;
1126 	dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
1127 	ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1128 	if(entry == NULL){
1129 		printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1130 		return;
1131 	}
1132 	ddprintk(" entry_state = %d ", entry->entry_state);
1133 
1134 	if (entry->entry_state == INGRESS_RESOLVED) {
1135 		printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1136 		mpc->in_ops->put(entry);
1137 		return;
1138 	}
1139 
1140 	entry->ctrl_info = msg->content.in_info;
1141 	do_gettimeofday(&(entry->tv));
1142 	do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1143 	entry->refresh_time = 0;
1144 	ddprintk("entry->shortcut = %p\n", entry->shortcut);
1145 
1146 	if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1147 		entry->entry_state = INGRESS_RESOLVED;
1148 		mpc->in_ops->put(entry);
1149 		return; /* Shortcut already open... */
1150 	}
1151 
1152 	if (entry->shortcut != NULL) {
1153 		printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1154 		       mpc->dev->name);
1155 		mpc->in_ops->put(entry);
1156 		return;
1157 	}
1158 
1159 	check_qos_and_open_shortcut(msg, mpc, entry);
1160 	entry->entry_state = INGRESS_RESOLVED;
1161 	mpc->in_ops->put(entry);
1162 
1163 	return;
1164 
1165 }
1166 
1167 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1168 {
1169 	uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1170 	uint32_t mask = msg->ip_mask;
1171 	unsigned char *ip = (unsigned char *)&dst_ip;
1172 	in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1173 
1174 	if(entry == NULL){
1175 		printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1176 		printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1177 		return;
1178 	}
1179 
1180 	do {
1181 		dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1182 			mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1183 		write_lock_bh(&mpc->ingress_lock);
1184 		mpc->in_ops->remove_entry(entry, mpc);
1185 		write_unlock_bh(&mpc->ingress_lock);
1186 		mpc->in_ops->put(entry);
1187 		entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1188 	} while (entry != NULL);
1189 
1190 	return;
1191 }
1192 
1193 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1194 {
1195 	uint32_t cache_id = msg->content.eg_info.cache_id;
1196 	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1197 
1198 	if (entry == NULL) {
1199 		dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1200 		return;
1201 	}
1202 
1203 	write_lock_irq(&mpc->egress_lock);
1204 	mpc->eg_ops->remove_entry(entry, mpc);
1205 	write_unlock_irq(&mpc->egress_lock);
1206 
1207 	mpc->eg_ops->put(entry);
1208 
1209 	return;
1210 }
1211 
1212 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1213 {
1214 	struct sock *sk;
1215 	struct k_message *purge_msg;
1216 	struct sk_buff *skb;
1217 
1218 	dprintk("mpoa: purge_egress_shortcut: entering\n");
1219 	if (vcc == NULL) {
1220 		printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1221 		return;
1222 	}
1223 
1224 	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1225 	if (skb == NULL) {
1226 		 printk("mpoa: purge_egress_shortcut: out of memory\n");
1227 		return;
1228 	}
1229 
1230 	skb_put(skb, sizeof(struct k_message));
1231 	memset(skb->data, 0, sizeof(struct k_message));
1232 	purge_msg = (struct k_message *)skb->data;
1233 	purge_msg->type = DATA_PLANE_PURGE;
1234 	if (entry != NULL)
1235 		purge_msg->content.eg_info = entry->ctrl_info;
1236 
1237 	atm_force_charge(vcc, skb->truesize);
1238 
1239 	sk = sk_atm(vcc);
1240 	skb_queue_tail(&sk->sk_receive_queue, skb);
1241 	sk->sk_data_ready(sk, skb->len);
1242 	dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1243 
1244 	return;
1245 }
1246 
1247 /*
1248  * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1249  * of the egress shortcuts we have.
1250  */
1251 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1252 {
1253 	eg_cache_entry *entry;
1254 
1255 	dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1256 
1257 	if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1258 		printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1259 		return;
1260 	}
1261 
1262 	/* FIXME: This knows too much of the cache structure */
1263 	read_lock_irq(&mpc->egress_lock);
1264 	entry = mpc->eg_cache;
1265 	while (entry != NULL) {
1266 		purge_egress_shortcut(entry->shortcut, entry);
1267 		entry = entry->next;
1268 	}
1269 	read_unlock_irq(&mpc->egress_lock);
1270 
1271 	mpc->in_ops->destroy_cache(mpc);
1272 	mpc->eg_ops->destroy_cache(mpc);
1273 
1274 	return;
1275 }
1276 
1277 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1278 {
1279 	uint16_t holding_time;
1280 	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1281 
1282 	holding_time = msg->content.eg_info.holding_time;
1283 	dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1284 	       mpc->dev->name, entry, holding_time);
1285 	if(entry == NULL && holding_time) {
1286 		entry = mpc->eg_ops->add_entry(msg, mpc);
1287 		mpc->eg_ops->put(entry);
1288 		return;
1289 	}
1290 	if(holding_time){
1291 		mpc->eg_ops->update(entry, holding_time);
1292 		return;
1293 	}
1294 
1295 	write_lock_irq(&mpc->egress_lock);
1296 	mpc->eg_ops->remove_entry(entry, mpc);
1297 	write_unlock_irq(&mpc->egress_lock);
1298 
1299 	mpc->eg_ops->put(entry);
1300 
1301 	return;
1302 }
1303 
1304 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1305 {
1306 	struct lec_priv *priv;
1307 	int i, retval ;
1308 
1309 	uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1310 
1311 	tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
1312 	tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
1313 	tlv[5] = 0x02;                 /* MPOA client                      */
1314 	tlv[6] = 0x00;                 /* number of MPS MAC addresses      */
1315 
1316 	memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1317 	memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1318 
1319 	dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1320 	       (mpc->dev) ? mpc->dev->name : "<unknown>");
1321 	for (i = 7; i < sizeof(tlv); i++)
1322 		dprintk("%02x ", tlv[i]);
1323 	dprintk("\n");
1324 
1325 	if (mpc->dev) {
1326 		priv = (struct lec_priv *)mpc->dev->priv;
1327 		retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1328 		if (retval == 0)
1329 			printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1330 		retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1331 		if (retval < 0)
1332 			printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1333 	}
1334 
1335 	return;
1336 }
1337 
1338 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1339 {
1340 
1341 	if(client->number_of_mps_macs)
1342 		kfree(client->mps_macs);
1343 	client->number_of_mps_macs = 0;
1344 	client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1345 	if (client->mps_macs == NULL) {
1346 		printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1347 		return;
1348 	}
1349 	client->number_of_mps_macs = 1;
1350 	memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1351 
1352 	return;
1353 }
1354 
1355 /*
1356  * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1357  */
1358 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1359 {
1360 
1361 	eg_cache_entry *entry;
1362 	msg->type = SND_EGRESS_PURGE;
1363 
1364 
1365 	/* FIXME: This knows too much of the cache structure */
1366 	read_lock_irq(&mpc->egress_lock);
1367 	entry = mpc->eg_cache;
1368 	while (entry != NULL){
1369 		    msg->content.eg_info = entry->ctrl_info;
1370 		    dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1371 		    msg_to_mpoad(msg, mpc);
1372 		    entry = entry->next;
1373 	}
1374 	read_unlock_irq(&mpc->egress_lock);
1375 
1376 	msg->type = action;
1377 	msg_to_mpoad(msg, mpc);
1378 	return;
1379 }
1380 
1381 static void mpc_timer_refresh(void)
1382 {
1383 	mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1384 	mpc_timer.data = mpc_timer.expires;
1385 	mpc_timer.function = mpc_cache_check;
1386 	add_timer(&mpc_timer);
1387 
1388 	return;
1389 }
1390 
1391 static void mpc_cache_check( unsigned long checking_time  )
1392 {
1393 	struct mpoa_client *mpc = mpcs;
1394 	static unsigned long previous_resolving_check_time;
1395 	static unsigned long previous_refresh_time;
1396 
1397 	while( mpc != NULL ){
1398 		mpc->in_ops->clear_count(mpc);
1399 		mpc->eg_ops->clear_expired(mpc);
1400 		if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1401 			mpc->in_ops->check_resolving(mpc);
1402 			previous_resolving_check_time = checking_time;
1403 		}
1404 		if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1405 			mpc->in_ops->refresh(mpc);
1406 			previous_refresh_time = checking_time;
1407 		}
1408 		mpc = mpc->next;
1409 	}
1410 	mpc_timer_refresh();
1411 
1412 	return;
1413 }
1414 
1415 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1416 {
1417 	int err = 0;
1418 	struct atm_vcc *vcc = ATM_SD(sock);
1419 
1420 	if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1421 		return -ENOIOCTLCMD;
1422 
1423 	if (!capable(CAP_NET_ADMIN))
1424 		return -EPERM;
1425 
1426 	switch (cmd) {
1427 		case ATMMPC_CTRL:
1428 			err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1429 			if (err >= 0)
1430 				sock->state = SS_CONNECTED;
1431 			break;
1432 		case ATMMPC_DATA:
1433 			err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1434 			break;
1435 		default:
1436 			break;
1437 	}
1438 	return err;
1439 }
1440 
1441 
1442 static struct atm_ioctl atm_ioctl_ops = {
1443 	.owner	= THIS_MODULE,
1444 	.ioctl	= atm_mpoa_ioctl,
1445 };
1446 
1447 static __init int atm_mpoa_init(void)
1448 {
1449 	register_atm_ioctl(&atm_ioctl_ops);
1450 
1451 #ifdef CONFIG_PROC_FS
1452 	if (mpc_proc_init() != 0)
1453 		printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1454 	else
1455 		printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1456 #endif
1457 
1458 	printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1459 
1460 	return 0;
1461 }
1462 
1463 static void __exit atm_mpoa_cleanup(void)
1464 {
1465 	struct mpoa_client *mpc, *tmp;
1466 	struct atm_mpoa_qos *qos, *nextqos;
1467 	struct lec_priv *priv;
1468 
1469 #ifdef CONFIG_PROC_FS
1470 	mpc_proc_clean();
1471 #endif
1472 
1473 	del_timer(&mpc_timer);
1474 	unregister_netdevice_notifier(&mpoa_notifier);
1475 	deregister_atm_ioctl(&atm_ioctl_ops);
1476 
1477 	mpc = mpcs;
1478 	mpcs = NULL;
1479 	while (mpc != NULL) {
1480 		tmp = mpc->next;
1481 		if (mpc->dev != NULL) {
1482 			stop_mpc(mpc);
1483 			priv = (struct lec_priv *)mpc->dev->priv;
1484 			if (priv->lane2_ops != NULL)
1485 				priv->lane2_ops->associate_indicator = NULL;
1486 		}
1487 		ddprintk("mpoa: cleanup_module: about to clear caches\n");
1488 		mpc->in_ops->destroy_cache(mpc);
1489 		mpc->eg_ops->destroy_cache(mpc);
1490 		ddprintk("mpoa: cleanup_module: caches cleared\n");
1491 		kfree(mpc->mps_macs);
1492 		memset(mpc, 0, sizeof(struct mpoa_client));
1493 		ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1494 		kfree(mpc);
1495 		ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1496 		mpc = tmp;
1497 	}
1498 
1499 	qos = qos_head;
1500 	qos_head = NULL;
1501 	while (qos != NULL) {
1502 		nextqos = qos->next;
1503 		dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1504 		kfree(qos);
1505 		qos = nextqos;
1506 	}
1507 
1508 	return;
1509 }
1510 
1511 module_init(atm_mpoa_init);
1512 module_exit(atm_mpoa_cleanup);
1513 
1514 MODULE_LICENSE("GPL");
1515