xref: /openbmc/linux/net/atm/mpc.c (revision d5532ee7)
1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
2 
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/slab.h>
6 #include <linux/timer.h>
7 #include <linux/init.h>
8 #include <linux/bitops.h>
9 #include <linux/capability.h>
10 #include <linux/seq_file.h>
11 
12 /* We are an ethernet device */
13 #include <linux/if_ether.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <net/sock.h>
17 #include <linux/skbuff.h>
18 #include <linux/ip.h>
19 #include <linux/uaccess.h>
20 #include <asm/byteorder.h>
21 #include <net/checksum.h>   /* for ip_fast_csum() */
22 #include <net/arp.h>
23 #include <net/dst.h>
24 #include <linux/proc_fs.h>
25 
26 /* And atm device */
27 #include <linux/atmdev.h>
28 #include <linux/atmlec.h>
29 #include <linux/atmmpc.h>
30 /* Modular too */
31 #include <linux/module.h>
32 
33 #include "lec.h"
34 #include "mpc.h"
35 #include "resources.h"
36 
37 /*
38  * mpc.c: Implementation of MPOA client kernel part
39  */
40 
41 #if 0
42 #define dprintk(format, args...) \
43 	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
44 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
45 #else
46 #define dprintk(format, args...)					\
47 	do { if (0)							\
48 		printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
49 	} while (0)
50 #define dprintk_cont(format, args...)			\
51 	do { if (0) printk(KERN_CONT format, ##args); } while (0)
52 #endif
53 
54 #if 0
55 #define ddprintk(format, args...) \
56 	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
57 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
58 #else
59 #define ddprintk(format, args...)					\
60 	do { if (0)							\
61 		printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
62 	} while (0)
63 #define ddprintk_cont(format, args...)			\
64 	do { if (0) printk(KERN_CONT format, ##args); } while (0)
65 #endif
66 
67 #define MPOA_TAG_LEN 4
68 
69 /* mpc_daemon -> kernel */
70 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
71 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
72 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
73 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
74 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
75 static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
76 		     int action);
77 static void MPOA_cache_impos_rcvd(struct k_message *msg,
78 				  struct mpoa_client *mpc);
79 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
80 				   struct mpoa_client *mpc);
81 static void set_mps_mac_addr_rcvd(struct k_message *mesg,
82 				  struct mpoa_client *mpc);
83 
84 static const uint8_t *copy_macs(struct mpoa_client *mpc,
85 				const uint8_t *router_mac,
86 				const uint8_t *tlvs, uint8_t mps_macs,
87 				uint8_t device_type);
88 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
89 
90 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
91 static void mpoad_close(struct atm_vcc *vcc);
92 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
93 
94 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
95 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
96 				   struct net_device *dev);
97 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
98 			       unsigned long event, void *dev);
99 static void mpc_timer_refresh(void);
100 static void mpc_cache_check(unsigned long checking_time);
101 
102 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
103 	0xaa, 0xaa, 0x03,
104 	{0x00, 0x00, 0x5e},
105 	{0x00, 0x03}         /* For MPOA control PDUs */
106 };
107 static struct llc_snap_hdr llc_snap_mpoa_data = {
108 	0xaa, 0xaa, 0x03,
109 	{0x00, 0x00, 0x00},
110 	{0x08, 0x00}         /* This is for IP PDUs only */
111 };
112 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
113 	0xaa, 0xaa, 0x03,
114 	{0x00, 0x00, 0x00},
115 	{0x88, 0x4c}         /* This is for tagged data PDUs */
116 };
117 
118 static struct notifier_block mpoa_notifier = {
119 	mpoa_event_listener,
120 	NULL,
121 	0
122 };
123 
124 struct mpoa_client *mpcs = NULL; /* FIXME */
125 static struct atm_mpoa_qos *qos_head = NULL;
126 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
127 
128 
129 static struct mpoa_client *find_mpc_by_itfnum(int itf)
130 {
131 	struct mpoa_client *mpc;
132 
133 	mpc = mpcs;  /* our global linked list */
134 	while (mpc != NULL) {
135 		if (mpc->dev_num == itf)
136 			return mpc;
137 		mpc = mpc->next;
138 	}
139 
140 	return NULL;   /* not found */
141 }
142 
143 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
144 {
145 	struct mpoa_client *mpc;
146 
147 	mpc = mpcs;  /* our global linked list */
148 	while (mpc != NULL) {
149 		if (mpc->mpoad_vcc == vcc)
150 			return mpc;
151 		mpc = mpc->next;
152 	}
153 
154 	return NULL;   /* not found */
155 }
156 
157 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
158 {
159 	struct mpoa_client *mpc;
160 
161 	mpc = mpcs;  /* our global linked list */
162 	while (mpc != NULL) {
163 		if (mpc->dev == dev)
164 			return mpc;
165 		mpc = mpc->next;
166 	}
167 
168 	return NULL;   /* not found */
169 }
170 
171 /*
172  * Functions for managing QoS list
173  */
174 
175 /*
176  * Overwrites the old entry or makes a new one.
177  */
178 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
179 {
180 	struct atm_mpoa_qos *entry;
181 
182 	entry = atm_mpoa_search_qos(dst_ip);
183 	if (entry != NULL) {
184 		entry->qos = *qos;
185 		return entry;
186 	}
187 
188 	entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
189 	if (entry == NULL) {
190 		pr_info("mpoa: out of memory\n");
191 		return entry;
192 	}
193 
194 	entry->ipaddr = dst_ip;
195 	entry->qos = *qos;
196 
197 	entry->next = qos_head;
198 	qos_head = entry;
199 
200 	return entry;
201 }
202 
203 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
204 {
205 	struct atm_mpoa_qos *qos;
206 
207 	qos = qos_head;
208 	while (qos) {
209 		if (qos->ipaddr == dst_ip)
210 			break;
211 		qos = qos->next;
212 	}
213 
214 	return qos;
215 }
216 
217 /*
218  * Returns 0 for failure
219  */
220 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
221 {
222 	struct atm_mpoa_qos *curr;
223 
224 	if (entry == NULL)
225 		return 0;
226 	if (entry == qos_head) {
227 		qos_head = qos_head->next;
228 		kfree(entry);
229 		return 1;
230 	}
231 
232 	curr = qos_head;
233 	while (curr != NULL) {
234 		if (curr->next == entry) {
235 			curr->next = entry->next;
236 			kfree(entry);
237 			return 1;
238 		}
239 		curr = curr->next;
240 	}
241 
242 	return 0;
243 }
244 
245 /* this is buggered - we need locking for qos_head */
246 void atm_mpoa_disp_qos(struct seq_file *m)
247 {
248 	struct atm_mpoa_qos *qos;
249 
250 	qos = qos_head;
251 	seq_printf(m, "QoS entries for shortcuts:\n");
252 	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");
253 
254 	while (qos != NULL) {
255 		seq_printf(m, "%pI4\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
256 			   &qos->ipaddr,
257 			   qos->qos.txtp.max_pcr,
258 			   qos->qos.txtp.pcr,
259 			   qos->qos.txtp.min_pcr,
260 			   qos->qos.txtp.max_cdv,
261 			   qos->qos.txtp.max_sdu,
262 			   qos->qos.rxtp.max_pcr,
263 			   qos->qos.rxtp.pcr,
264 			   qos->qos.rxtp.min_pcr,
265 			   qos->qos.rxtp.max_cdv,
266 			   qos->qos.rxtp.max_sdu);
267 		qos = qos->next;
268 	}
269 }
270 
271 static struct net_device *find_lec_by_itfnum(int itf)
272 {
273 	struct net_device *dev;
274 	char name[IFNAMSIZ];
275 
276 	sprintf(name, "lec%d", itf);
277 	dev = dev_get_by_name(&init_net, name);
278 
279 	return dev;
280 }
281 
282 static struct mpoa_client *alloc_mpc(void)
283 {
284 	struct mpoa_client *mpc;
285 
286 	mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
287 	if (mpc == NULL)
288 		return NULL;
289 	rwlock_init(&mpc->ingress_lock);
290 	rwlock_init(&mpc->egress_lock);
291 	mpc->next = mpcs;
292 	atm_mpoa_init_cache(mpc);
293 
294 	mpc->parameters.mpc_p1 = MPC_P1;
295 	mpc->parameters.mpc_p2 = MPC_P2;
296 	memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
297 	mpc->parameters.mpc_p4 = MPC_P4;
298 	mpc->parameters.mpc_p5 = MPC_P5;
299 	mpc->parameters.mpc_p6 = MPC_P6;
300 
301 	mpcs = mpc;
302 
303 	return mpc;
304 }
305 
306 /*
307  *
308  * start_mpc() puts the MPC on line. All the packets destined
309  * to the lec underneath us are now being monitored and
310  * shortcuts will be established.
311  *
312  */
313 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
314 {
315 
316 	dprintk("(%s)\n", mpc->dev->name);
317 	if (!dev->netdev_ops)
318 		pr_info("(%s) not starting\n", dev->name);
319 	else {
320 		mpc->old_ops = dev->netdev_ops;
321 		mpc->new_ops = *mpc->old_ops;
322 		mpc->new_ops.ndo_start_xmit = mpc_send_packet;
323 		dev->netdev_ops = &mpc->new_ops;
324 	}
325 }
326 
327 static void stop_mpc(struct mpoa_client *mpc)
328 {
329 	struct net_device *dev = mpc->dev;
330 	dprintk("(%s)", mpc->dev->name);
331 
332 	/* Lets not nullify lec device's dev->hard_start_xmit */
333 	if (dev->netdev_ops != &mpc->new_ops) {
334 		dprintk_cont(" mpc already stopped, not fatal\n");
335 		return;
336 	}
337 	dprintk_cont("\n");
338 
339 	dev->netdev_ops = mpc->old_ops;
340 	mpc->old_ops = NULL;
341 
342 	/* close_shortcuts(mpc);    ??? FIXME */
343 }
344 
345 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
346 
347 static const char *mpoa_device_type_string(char type)
348 {
349 	switch (type) {
350 	case NON_MPOA:
351 		return "non-MPOA device";
352 	case MPS:
353 		return "MPS";
354 	case MPC:
355 		return "MPC";
356 	case MPS_AND_MPC:
357 		return "both MPS and MPC";
358 	}
359 
360 	return "unspecified (non-MPOA) device";
361 }
362 
363 /*
364  * lec device calls this via its netdev_priv(dev)->lane2_ops
365  * ->associate_indicator() when it sees a TLV in LE_ARP packet.
366  * We fill in the pointer above when we see a LANE2 lec initializing
367  * See LANE2 spec 3.1.5
368  *
369  * Quite a big and ugly function but when you look at it
370  * all it does is to try to locate and parse MPOA Device
371  * Type TLV.
372  * We give our lec a pointer to this function and when the
373  * lec sees a TLV it uses the pointer to call this function.
374  *
375  */
376 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
377 			    const u8 *tlvs, u32 sizeoftlvs)
378 {
379 	uint32_t type;
380 	uint8_t length, mpoa_device_type, number_of_mps_macs;
381 	const uint8_t *end_of_tlvs;
382 	struct mpoa_client *mpc;
383 
384 	mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
385 	dprintk("(%s) received TLV(s), ", dev->name);
386 	dprintk("total length of all TLVs %d\n", sizeoftlvs);
387 	mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
388 	if (mpc == NULL) {
389 		pr_info("(%s) no mpc\n", dev->name);
390 		return;
391 	}
392 	end_of_tlvs = tlvs + sizeoftlvs;
393 	while (end_of_tlvs - tlvs >= 5) {
394 		type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
395 			(tlvs[2] << 8) | tlvs[3]);
396 		length = tlvs[4];
397 		tlvs += 5;
398 		dprintk("    type 0x%x length %02x\n", type, length);
399 		if (tlvs + length > end_of_tlvs) {
400 			pr_info("TLV value extends past its buffer, aborting parse\n");
401 			return;
402 		}
403 
404 		if (type == 0) {
405 			pr_info("mpoa: (%s) TLV type was 0, returning\n",
406 				dev->name);
407 			return;
408 		}
409 
410 		if (type != TLV_MPOA_DEVICE_TYPE) {
411 			tlvs += length;
412 			continue;  /* skip other TLVs */
413 		}
414 		mpoa_device_type = *tlvs++;
415 		number_of_mps_macs = *tlvs++;
416 		dprintk("(%s) MPOA device type '%s', ",
417 			dev->name, mpoa_device_type_string(mpoa_device_type));
418 		if (mpoa_device_type == MPS_AND_MPC &&
419 		    length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
420 			pr_info("(%s) short MPOA Device Type TLV\n",
421 				dev->name);
422 			continue;
423 		}
424 		if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
425 		    length < 22 + number_of_mps_macs*ETH_ALEN) {
426 			pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
427 			continue;
428 		}
429 		if (mpoa_device_type != MPS &&
430 		    mpoa_device_type != MPS_AND_MPC) {
431 			dprintk("ignoring non-MPS device ");
432 			if (mpoa_device_type == MPC)
433 				tlvs += 20;
434 			continue;  /* we are only interested in MPSs */
435 		}
436 		if (number_of_mps_macs == 0 &&
437 		    mpoa_device_type == MPS_AND_MPC) {
438 			pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
439 			continue;  /* someone should read the spec */
440 		}
441 		dprintk_cont("this MPS has %d MAC addresses\n",
442 			     number_of_mps_macs);
443 
444 		/*
445 		 * ok, now we can go and tell our daemon
446 		 * the control address of MPS
447 		 */
448 		send_set_mps_ctrl_addr(tlvs, mpc);
449 
450 		tlvs = copy_macs(mpc, mac_addr, tlvs,
451 				 number_of_mps_macs, mpoa_device_type);
452 		if (tlvs == NULL)
453 			return;
454 	}
455 	if (end_of_tlvs - tlvs != 0)
456 		pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n",
457 			dev->name, end_of_tlvs - tlvs);
458 }
459 
460 /*
461  * Store at least advertizing router's MAC address
462  * plus the possible MAC address(es) to mpc->mps_macs.
463  * For a freshly allocated MPOA client mpc->mps_macs == 0.
464  */
465 static const uint8_t *copy_macs(struct mpoa_client *mpc,
466 				const uint8_t *router_mac,
467 				const uint8_t *tlvs, uint8_t mps_macs,
468 				uint8_t device_type)
469 {
470 	int num_macs;
471 	num_macs = (mps_macs > 1) ? mps_macs : 1;
472 
473 	if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
474 		if (mpc->number_of_mps_macs != 0)
475 			kfree(mpc->mps_macs);
476 		mpc->number_of_mps_macs = 0;
477 		mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL);
478 		if (mpc->mps_macs == NULL) {
479 			pr_info("(%s) out of mem\n", mpc->dev->name);
480 			return NULL;
481 		}
482 	}
483 	memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
484 	tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
485 	if (mps_macs > 0)
486 		memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
487 	tlvs += mps_macs*ETH_ALEN;
488 	mpc->number_of_mps_macs = num_macs;
489 
490 	return tlvs;
491 }
492 
493 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
494 {
495 	in_cache_entry *entry;
496 	struct iphdr *iph;
497 	char *buff;
498 	__be32 ipaddr = 0;
499 
500 	static struct {
501 		struct llc_snap_hdr hdr;
502 		__be32 tag;
503 	} tagged_llc_snap_hdr = {
504 		{0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
505 		0
506 	};
507 
508 	buff = skb->data + mpc->dev->hard_header_len;
509 	iph = (struct iphdr *)buff;
510 	ipaddr = iph->daddr;
511 
512 	ddprintk("(%s) ipaddr 0x%x\n",
513 		 mpc->dev->name, ipaddr);
514 
515 	entry = mpc->in_ops->get(ipaddr, mpc);
516 	if (entry == NULL) {
517 		entry = mpc->in_ops->add_entry(ipaddr, mpc);
518 		if (entry != NULL)
519 			mpc->in_ops->put(entry);
520 		return 1;
521 	}
522 	/* threshold not exceeded or VCC not ready */
523 	if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
524 		ddprintk("(%s) cache_hit: returns != OPEN\n",
525 			 mpc->dev->name);
526 		mpc->in_ops->put(entry);
527 		return 1;
528 	}
529 
530 	ddprintk("(%s) using shortcut\n",
531 		 mpc->dev->name);
532 	/* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
533 	if (iph->ttl <= 1) {
534 		ddprintk("(%s) IP ttl = %u, using LANE\n",
535 			 mpc->dev->name, iph->ttl);
536 		mpc->in_ops->put(entry);
537 		return 1;
538 	}
539 	iph->ttl--;
540 	iph->check = 0;
541 	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
542 
543 	if (entry->ctrl_info.tag != 0) {
544 		ddprintk("(%s) adding tag 0x%x\n",
545 			 mpc->dev->name, entry->ctrl_info.tag);
546 		tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
547 		skb_pull(skb, ETH_HLEN);	/* get rid of Eth header */
548 		skb_push(skb, sizeof(tagged_llc_snap_hdr));
549 						/* add LLC/SNAP header   */
550 		skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
551 					sizeof(tagged_llc_snap_hdr));
552 	} else {
553 		skb_pull(skb, ETH_HLEN);	/* get rid of Eth header */
554 		skb_push(skb, sizeof(struct llc_snap_hdr));
555 						/* add LLC/SNAP header + tag  */
556 		skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
557 					sizeof(struct llc_snap_hdr));
558 	}
559 
560 	atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
561 	ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
562 	entry->shortcut->send(entry->shortcut, skb);
563 	entry->packets_fwded++;
564 	mpc->in_ops->put(entry);
565 
566 	return 0;
567 }
568 
569 /*
570  * Probably needs some error checks and locking, not sure...
571  */
572 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
573 					 struct net_device *dev)
574 {
575 	struct mpoa_client *mpc;
576 	struct ethhdr *eth;
577 	int i = 0;
578 
579 	mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
580 	if (mpc == NULL) {
581 		pr_info("(%s) no MPC found\n", dev->name);
582 		goto non_ip;
583 	}
584 
585 	eth = (struct ethhdr *)skb->data;
586 	if (eth->h_proto != htons(ETH_P_IP))
587 		goto non_ip; /* Multi-Protocol Over ATM :-) */
588 
589 	/* Weed out funny packets (e.g., AF_PACKET or raw). */
590 	if (skb->len < ETH_HLEN + sizeof(struct iphdr))
591 		goto non_ip;
592 	skb_set_network_header(skb, ETH_HLEN);
593 	if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
594 		goto non_ip;
595 
596 	while (i < mpc->number_of_mps_macs) {
597 		if (!compare_ether_addr(eth->h_dest,
598 					(mpc->mps_macs + i*ETH_ALEN)))
599 			if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
600 				return NETDEV_TX_OK;
601 		i++;
602 	}
603 
604 non_ip:
605 	return mpc->old_ops->ndo_start_xmit(skb, dev);
606 }
607 
608 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
609 {
610 	int bytes_left;
611 	struct mpoa_client *mpc;
612 	struct atmmpc_ioc ioc_data;
613 	in_cache_entry *in_entry;
614 	__be32  ipaddr;
615 
616 	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
617 	if (bytes_left != 0) {
618 		pr_info("mpoa:Short read (missed %d bytes) from userland\n",
619 			bytes_left);
620 		return -EFAULT;
621 	}
622 	ipaddr = ioc_data.ipaddr;
623 	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
624 		return -EINVAL;
625 
626 	mpc = find_mpc_by_itfnum(ioc_data.dev_num);
627 	if (mpc == NULL)
628 		return -EINVAL;
629 
630 	if (ioc_data.type == MPC_SOCKET_INGRESS) {
631 		in_entry = mpc->in_ops->get(ipaddr, mpc);
632 		if (in_entry == NULL ||
633 		    in_entry->entry_state < INGRESS_RESOLVED) {
634 			pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
635 				mpc->dev->name);
636 			if (in_entry != NULL)
637 				mpc->in_ops->put(in_entry);
638 			return -EINVAL;
639 		}
640 		pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
641 			mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
642 		in_entry->shortcut = vcc;
643 		mpc->in_ops->put(in_entry);
644 	} else {
645 		pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
646 	}
647 
648 	vcc->proto_data = mpc->dev;
649 	vcc->push = mpc_push;
650 
651 	return 0;
652 }
653 
654 /*
655  *
656  */
657 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
658 {
659 	struct mpoa_client *mpc;
660 	in_cache_entry *in_entry;
661 	eg_cache_entry *eg_entry;
662 
663 	mpc = find_mpc_by_lec(dev);
664 	if (mpc == NULL) {
665 		pr_info("(%s) close for unknown MPC\n", dev->name);
666 		return;
667 	}
668 
669 	dprintk("(%s)\n", dev->name);
670 	in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
671 	if (in_entry) {
672 		dprintk("(%s) ingress SVC closed ip = %pI4\n",
673 			mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
674 		in_entry->shortcut = NULL;
675 		mpc->in_ops->put(in_entry);
676 	}
677 	eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
678 	if (eg_entry) {
679 		dprintk("(%s) egress SVC closed\n", mpc->dev->name);
680 		eg_entry->shortcut = NULL;
681 		mpc->eg_ops->put(eg_entry);
682 	}
683 
684 	if (in_entry == NULL && eg_entry == NULL)
685 		dprintk("(%s) unused vcc closed\n", dev->name);
686 }
687 
688 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
689 {
690 	struct net_device *dev = (struct net_device *)vcc->proto_data;
691 	struct sk_buff *new_skb;
692 	eg_cache_entry *eg;
693 	struct mpoa_client *mpc;
694 	__be32 tag;
695 	char *tmp;
696 
697 	ddprintk("(%s)\n", dev->name);
698 	if (skb == NULL) {
699 		dprintk("(%s) null skb, closing VCC\n", dev->name);
700 		mpc_vcc_close(vcc, dev);
701 		return;
702 	}
703 
704 	skb->dev = dev;
705 	if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
706 		   sizeof(struct llc_snap_hdr)) == 0) {
707 		struct sock *sk = sk_atm(vcc);
708 
709 		dprintk("(%s) control packet arrived\n", dev->name);
710 		/* Pass control packets to daemon */
711 		skb_queue_tail(&sk->sk_receive_queue, skb);
712 		sk->sk_data_ready(sk, skb->len);
713 		return;
714 	}
715 
716 	/* data coming over the shortcut */
717 	atm_return(vcc, skb->truesize);
718 
719 	mpc = find_mpc_by_lec(dev);
720 	if (mpc == NULL) {
721 		pr_info("(%s) unknown MPC\n", dev->name);
722 		return;
723 	}
724 
725 	if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
726 		   sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
727 		ddprintk("(%s) tagged data packet arrived\n", dev->name);
728 
729 	} else if (memcmp(skb->data, &llc_snap_mpoa_data,
730 			  sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
731 		pr_info("(%s) Unsupported non-tagged data packet arrived.  Purging\n",
732 			dev->name);
733 		dev_kfree_skb_any(skb);
734 		return;
735 	} else {
736 		pr_info("(%s) garbage arrived, purging\n", dev->name);
737 		dev_kfree_skb_any(skb);
738 		return;
739 	}
740 
741 	tmp = skb->data + sizeof(struct llc_snap_hdr);
742 	tag = *(__be32 *)tmp;
743 
744 	eg = mpc->eg_ops->get_by_tag(tag, mpc);
745 	if (eg == NULL) {
746 		pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
747 			dev->name, tag);
748 		purge_egress_shortcut(vcc, NULL);
749 		dev_kfree_skb_any(skb);
750 		return;
751 	}
752 
753 	/*
754 	 * See if ingress MPC is using shortcut we opened as a return channel.
755 	 * This means we have a bi-directional vcc opened by us.
756 	 */
757 	if (eg->shortcut == NULL) {
758 		eg->shortcut = vcc;
759 		pr_info("(%s) egress SVC in use\n", dev->name);
760 	}
761 
762 	skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
763 					/* get rid of LLC/SNAP header */
764 	new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
765 					/* LLC/SNAP is shorter than MAC header :( */
766 	dev_kfree_skb_any(skb);
767 	if (new_skb == NULL) {
768 		mpc->eg_ops->put(eg);
769 		return;
770 	}
771 	skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */
772 	skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
773 				eg->ctrl_info.DH_length);
774 	new_skb->protocol = eth_type_trans(new_skb, dev);
775 	skb_reset_network_header(new_skb);
776 
777 	eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
778 	eg->packets_rcvd++;
779 	mpc->eg_ops->put(eg);
780 
781 	memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
782 	netif_rx(new_skb);
783 }
784 
785 static struct atmdev_ops mpc_ops = { /* only send is required */
786 	.close	= mpoad_close,
787 	.send	= msg_from_mpoad
788 };
789 
790 static struct atm_dev mpc_dev = {
791 	.ops	= &mpc_ops,
792 	.type	= "mpc",
793 	.number	= 42,
794 	.lock	= __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
795 	/* members not explicitly initialised will be 0 */
796 };
797 
798 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
799 {
800 	struct mpoa_client *mpc;
801 	struct lec_priv *priv;
802 	int err;
803 
804 	if (mpcs == NULL) {
805 		init_timer(&mpc_timer);
806 		mpc_timer_refresh();
807 
808 		/* This lets us now how our LECs are doing */
809 		err = register_netdevice_notifier(&mpoa_notifier);
810 		if (err < 0) {
811 			del_timer(&mpc_timer);
812 			return err;
813 		}
814 	}
815 
816 	mpc = find_mpc_by_itfnum(arg);
817 	if (mpc == NULL) {
818 		dprintk("allocating new mpc for itf %d\n", arg);
819 		mpc = alloc_mpc();
820 		if (mpc == NULL)
821 			return -ENOMEM;
822 		mpc->dev_num = arg;
823 		mpc->dev = find_lec_by_itfnum(arg);
824 					/* NULL if there was no lec */
825 	}
826 	if (mpc->mpoad_vcc) {
827 		pr_info("mpoad is already present for itf %d\n", arg);
828 		return -EADDRINUSE;
829 	}
830 
831 	if (mpc->dev) { /* check if the lec is LANE2 capable */
832 		priv = netdev_priv(mpc->dev);
833 		if (priv->lane_version < 2) {
834 			dev_put(mpc->dev);
835 			mpc->dev = NULL;
836 		} else
837 			priv->lane2_ops->associate_indicator = lane2_assoc_ind;
838 	}
839 
840 	mpc->mpoad_vcc = vcc;
841 	vcc->dev = &mpc_dev;
842 	vcc_insert_socket(sk_atm(vcc));
843 	set_bit(ATM_VF_META, &vcc->flags);
844 	set_bit(ATM_VF_READY, &vcc->flags);
845 
846 	if (mpc->dev) {
847 		char empty[ATM_ESA_LEN];
848 		memset(empty, 0, ATM_ESA_LEN);
849 
850 		start_mpc(mpc, mpc->dev);
851 		/* set address if mpcd e.g. gets killed and restarted.
852 		 * If we do not do it now we have to wait for the next LE_ARP
853 		 */
854 		if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
855 			send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
856 	}
857 
858 	__module_get(THIS_MODULE);
859 	return arg;
860 }
861 
862 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
863 {
864 	struct k_message mesg;
865 
866 	memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
867 
868 	mesg.type = SET_MPS_CTRL_ADDR;
869 	memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
870 	msg_to_mpoad(&mesg, mpc);
871 }
872 
873 static void mpoad_close(struct atm_vcc *vcc)
874 {
875 	struct mpoa_client *mpc;
876 	struct sk_buff *skb;
877 
878 	mpc = find_mpc_by_vcc(vcc);
879 	if (mpc == NULL) {
880 		pr_info("did not find MPC\n");
881 		return;
882 	}
883 	if (!mpc->mpoad_vcc) {
884 		pr_info("close for non-present mpoad\n");
885 		return;
886 	}
887 
888 	mpc->mpoad_vcc = NULL;
889 	if (mpc->dev) {
890 		struct lec_priv *priv = netdev_priv(mpc->dev);
891 		priv->lane2_ops->associate_indicator = NULL;
892 		stop_mpc(mpc);
893 		dev_put(mpc->dev);
894 	}
895 
896 	mpc->in_ops->destroy_cache(mpc);
897 	mpc->eg_ops->destroy_cache(mpc);
898 
899 	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
900 		atm_return(vcc, skb->truesize);
901 		kfree_skb(skb);
902 	}
903 
904 	pr_info("(%s) going down\n",
905 		(mpc->dev) ? mpc->dev->name : "<unknown>");
906 	module_put(THIS_MODULE);
907 }
908 
909 /*
910  *
911  */
912 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
913 {
914 
915 	struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
916 	struct k_message *mesg = (struct k_message *)skb->data;
917 	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
918 
919 	if (mpc == NULL) {
920 		pr_info("no mpc found\n");
921 		return 0;
922 	}
923 	dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
924 	switch (mesg->type) {
925 	case MPOA_RES_REPLY_RCVD:
926 		dprintk_cont("mpoa_res_reply_rcvd\n");
927 		MPOA_res_reply_rcvd(mesg, mpc);
928 		break;
929 	case MPOA_TRIGGER_RCVD:
930 		dprintk_cont("mpoa_trigger_rcvd\n");
931 		MPOA_trigger_rcvd(mesg, mpc);
932 		break;
933 	case INGRESS_PURGE_RCVD:
934 		dprintk_cont("nhrp_purge_rcvd\n");
935 		ingress_purge_rcvd(mesg, mpc);
936 		break;
937 	case EGRESS_PURGE_RCVD:
938 		dprintk_cont("egress_purge_reply_rcvd\n");
939 		egress_purge_rcvd(mesg, mpc);
940 		break;
941 	case MPS_DEATH:
942 		dprintk_cont("mps_death\n");
943 		mps_death(mesg, mpc);
944 		break;
945 	case CACHE_IMPOS_RCVD:
946 		dprintk_cont("cache_impos_rcvd\n");
947 		MPOA_cache_impos_rcvd(mesg, mpc);
948 		break;
949 	case SET_MPC_CTRL_ADDR:
950 		dprintk_cont("set_mpc_ctrl_addr\n");
951 		set_mpc_ctrl_addr_rcvd(mesg, mpc);
952 		break;
953 	case SET_MPS_MAC_ADDR:
954 		dprintk_cont("set_mps_mac_addr\n");
955 		set_mps_mac_addr_rcvd(mesg, mpc);
956 		break;
957 	case CLEAN_UP_AND_EXIT:
958 		dprintk_cont("clean_up_and_exit\n");
959 		clean_up(mesg, mpc, DIE);
960 		break;
961 	case RELOAD:
962 		dprintk_cont("reload\n");
963 		clean_up(mesg, mpc, RELOAD);
964 		break;
965 	case SET_MPC_PARAMS:
966 		dprintk_cont("set_mpc_params\n");
967 		mpc->parameters = mesg->content.params;
968 		break;
969 	default:
970 		dprintk_cont("unknown message %d\n", mesg->type);
971 		break;
972 	}
973 	kfree_skb(skb);
974 
975 	return 0;
976 }
977 
978 /* Remember that this function may not do things that sleep */
979 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
980 {
981 	struct sk_buff *skb;
982 	struct sock *sk;
983 
984 	if (mpc == NULL || !mpc->mpoad_vcc) {
985 		pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
986 		return -ENXIO;
987 	}
988 
989 	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
990 	if (skb == NULL)
991 		return -ENOMEM;
992 	skb_put(skb, sizeof(struct k_message));
993 	skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
994 	atm_force_charge(mpc->mpoad_vcc, skb->truesize);
995 
996 	sk = sk_atm(mpc->mpoad_vcc);
997 	skb_queue_tail(&sk->sk_receive_queue, skb);
998 	sk->sk_data_ready(sk, skb->len);
999 
1000 	return 0;
1001 }
1002 
1003 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1004 			       unsigned long event, void *dev_ptr)
1005 {
1006 	struct net_device *dev;
1007 	struct mpoa_client *mpc;
1008 	struct lec_priv *priv;
1009 
1010 	dev = (struct net_device *)dev_ptr;
1011 
1012 	if (!net_eq(dev_net(dev), &init_net))
1013 		return NOTIFY_DONE;
1014 
1015 	if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1016 		return NOTIFY_DONE; /* we are only interested in lec:s */
1017 
1018 	switch (event) {
1019 	case NETDEV_REGISTER:       /* a new lec device was allocated */
1020 		priv = netdev_priv(dev);
1021 		if (priv->lane_version < 2)
1022 			break;
1023 		priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1024 		mpc = find_mpc_by_itfnum(priv->itfnum);
1025 		if (mpc == NULL) {
1026 			dprintk("allocating new mpc for %s\n", dev->name);
1027 			mpc = alloc_mpc();
1028 			if (mpc == NULL) {
1029 				pr_info("no new mpc");
1030 				break;
1031 			}
1032 		}
1033 		mpc->dev_num = priv->itfnum;
1034 		mpc->dev = dev;
1035 		dev_hold(dev);
1036 		dprintk("(%s) was initialized\n", dev->name);
1037 		break;
1038 	case NETDEV_UNREGISTER:
1039 		/* the lec device was deallocated */
1040 		mpc = find_mpc_by_lec(dev);
1041 		if (mpc == NULL)
1042 			break;
1043 		dprintk("device (%s) was deallocated\n", dev->name);
1044 		stop_mpc(mpc);
1045 		dev_put(mpc->dev);
1046 		mpc->dev = NULL;
1047 		break;
1048 	case NETDEV_UP:
1049 		/* the dev was ifconfig'ed up */
1050 		mpc = find_mpc_by_lec(dev);
1051 		if (mpc == NULL)
1052 			break;
1053 		if (mpc->mpoad_vcc != NULL)
1054 			start_mpc(mpc, dev);
1055 		break;
1056 	case NETDEV_DOWN:
1057 		/* the dev was ifconfig'ed down */
1058 		/* this means that the flow of packets from the
1059 		 * upper layer stops
1060 		 */
1061 		mpc = find_mpc_by_lec(dev);
1062 		if (mpc == NULL)
1063 			break;
1064 		if (mpc->mpoad_vcc != NULL)
1065 			stop_mpc(mpc);
1066 		break;
1067 	case NETDEV_REBOOT:
1068 	case NETDEV_CHANGE:
1069 	case NETDEV_CHANGEMTU:
1070 	case NETDEV_CHANGEADDR:
1071 	case NETDEV_GOING_DOWN:
1072 		break;
1073 	default:
1074 		break;
1075 	}
1076 
1077 	return NOTIFY_DONE;
1078 }
1079 
1080 /*
1081  * Functions which are called after a message is received from mpcd.
1082  * Msg is reused on purpose.
1083  */
1084 
1085 
1086 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1087 {
1088 	__be32 dst_ip = msg->content.in_info.in_dst_ip;
1089 	in_cache_entry *entry;
1090 
1091 	entry = mpc->in_ops->get(dst_ip, mpc);
1092 	if (entry == NULL) {
1093 		entry = mpc->in_ops->add_entry(dst_ip, mpc);
1094 		entry->entry_state = INGRESS_RESOLVING;
1095 		msg->type = SND_MPOA_RES_RQST;
1096 		msg->content.in_info = entry->ctrl_info;
1097 		msg_to_mpoad(msg, mpc);
1098 		do_gettimeofday(&(entry->reply_wait));
1099 		mpc->in_ops->put(entry);
1100 		return;
1101 	}
1102 
1103 	if (entry->entry_state == INGRESS_INVALID) {
1104 		entry->entry_state = INGRESS_RESOLVING;
1105 		msg->type = SND_MPOA_RES_RQST;
1106 		msg->content.in_info = entry->ctrl_info;
1107 		msg_to_mpoad(msg, mpc);
1108 		do_gettimeofday(&(entry->reply_wait));
1109 		mpc->in_ops->put(entry);
1110 		return;
1111 	}
1112 
1113 	pr_info("(%s) entry already in resolving state\n",
1114 		(mpc->dev) ? mpc->dev->name : "<unknown>");
1115 	mpc->in_ops->put(entry);
1116 }
1117 
1118 /*
1119  * Things get complicated because we have to check if there's an egress
1120  * shortcut with suitable traffic parameters we could use.
1121  */
1122 static void check_qos_and_open_shortcut(struct k_message *msg,
1123 					struct mpoa_client *client,
1124 					in_cache_entry *entry)
1125 {
1126 	__be32 dst_ip = msg->content.in_info.in_dst_ip;
1127 	struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1128 	eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1129 
1130 	if (eg_entry && eg_entry->shortcut) {
1131 		if (eg_entry->shortcut->qos.txtp.traffic_class &
1132 		    msg->qos.txtp.traffic_class &
1133 		    (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1134 			if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1135 				entry->shortcut = eg_entry->shortcut;
1136 			else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1137 				entry->shortcut = eg_entry->shortcut;
1138 		}
1139 		if (entry->shortcut) {
1140 			dprintk("(%s) using egress SVC to reach %pI4\n",
1141 				client->dev->name, &dst_ip);
1142 			client->eg_ops->put(eg_entry);
1143 			return;
1144 		}
1145 	}
1146 	if (eg_entry != NULL)
1147 		client->eg_ops->put(eg_entry);
1148 
1149 	/* No luck in the egress cache we must open an ingress SVC */
1150 	msg->type = OPEN_INGRESS_SVC;
1151 	if (qos &&
1152 	    (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1153 		msg->qos = qos->qos;
1154 		pr_info("(%s) trying to get a CBR shortcut\n",
1155 			client->dev->name);
1156 	} else
1157 		memset(&msg->qos, 0, sizeof(struct atm_qos));
1158 	msg_to_mpoad(msg, client);
1159 }
1160 
1161 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1162 {
1163 	__be32 dst_ip = msg->content.in_info.in_dst_ip;
1164 	in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1165 
1166 	dprintk("(%s) ip %pI4\n",
1167 		mpc->dev->name, &dst_ip);
1168 	ddprintk("(%s) entry = %p",
1169 		 mpc->dev->name, entry);
1170 	if (entry == NULL) {
1171 		pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1172 			mpc->dev->name);
1173 		return;
1174 	}
1175 	ddprintk_cont(" entry_state = %d ", entry->entry_state);
1176 
1177 	if (entry->entry_state == INGRESS_RESOLVED) {
1178 		pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1179 		mpc->in_ops->put(entry);
1180 		return;
1181 	}
1182 
1183 	entry->ctrl_info = msg->content.in_info;
1184 	do_gettimeofday(&(entry->tv));
1185 	do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1186 	entry->refresh_time = 0;
1187 	ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1188 
1189 	if (entry->entry_state == INGRESS_RESOLVING &&
1190 	    entry->shortcut != NULL) {
1191 		entry->entry_state = INGRESS_RESOLVED;
1192 		mpc->in_ops->put(entry);
1193 		return; /* Shortcut already open... */
1194 	}
1195 
1196 	if (entry->shortcut != NULL) {
1197 		pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1198 			mpc->dev->name);
1199 		mpc->in_ops->put(entry);
1200 		return;
1201 	}
1202 
1203 	check_qos_and_open_shortcut(msg, mpc, entry);
1204 	entry->entry_state = INGRESS_RESOLVED;
1205 	mpc->in_ops->put(entry);
1206 
1207 	return;
1208 
1209 }
1210 
1211 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1212 {
1213 	__be32 dst_ip = msg->content.in_info.in_dst_ip;
1214 	__be32 mask = msg->ip_mask;
1215 	in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1216 
1217 	if (entry == NULL) {
1218 		pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1219 			mpc->dev->name, &dst_ip);
1220 		return;
1221 	}
1222 
1223 	do {
1224 		dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1225 			mpc->dev->name, &dst_ip);
1226 		write_lock_bh(&mpc->ingress_lock);
1227 		mpc->in_ops->remove_entry(entry, mpc);
1228 		write_unlock_bh(&mpc->ingress_lock);
1229 		mpc->in_ops->put(entry);
1230 		entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1231 	} while (entry != NULL);
1232 }
1233 
1234 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1235 {
1236 	__be32 cache_id = msg->content.eg_info.cache_id;
1237 	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1238 
1239 	if (entry == NULL) {
1240 		dprintk("(%s) purge for a non-existing entry\n",
1241 			mpc->dev->name);
1242 		return;
1243 	}
1244 
1245 	write_lock_irq(&mpc->egress_lock);
1246 	mpc->eg_ops->remove_entry(entry, mpc);
1247 	write_unlock_irq(&mpc->egress_lock);
1248 
1249 	mpc->eg_ops->put(entry);
1250 }
1251 
1252 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1253 {
1254 	struct sock *sk;
1255 	struct k_message *purge_msg;
1256 	struct sk_buff *skb;
1257 
1258 	dprintk("entering\n");
1259 	if (vcc == NULL) {
1260 		pr_info("vcc == NULL\n");
1261 		return;
1262 	}
1263 
1264 	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1265 	if (skb == NULL) {
1266 		pr_info("out of memory\n");
1267 		return;
1268 	}
1269 
1270 	skb_put(skb, sizeof(struct k_message));
1271 	memset(skb->data, 0, sizeof(struct k_message));
1272 	purge_msg = (struct k_message *)skb->data;
1273 	purge_msg->type = DATA_PLANE_PURGE;
1274 	if (entry != NULL)
1275 		purge_msg->content.eg_info = entry->ctrl_info;
1276 
1277 	atm_force_charge(vcc, skb->truesize);
1278 
1279 	sk = sk_atm(vcc);
1280 	skb_queue_tail(&sk->sk_receive_queue, skb);
1281 	sk->sk_data_ready(sk, skb->len);
1282 	dprintk("exiting\n");
1283 }
1284 
1285 /*
1286  * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1287  * of the egress shortcuts we have.
1288  */
1289 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1290 {
1291 	eg_cache_entry *entry;
1292 
1293 	dprintk("(%s)\n", mpc->dev->name);
1294 
1295 	if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1296 		pr_info("(%s) wrong MPS\n", mpc->dev->name);
1297 		return;
1298 	}
1299 
1300 	/* FIXME: This knows too much of the cache structure */
1301 	read_lock_irq(&mpc->egress_lock);
1302 	entry = mpc->eg_cache;
1303 	while (entry != NULL) {
1304 		purge_egress_shortcut(entry->shortcut, entry);
1305 		entry = entry->next;
1306 	}
1307 	read_unlock_irq(&mpc->egress_lock);
1308 
1309 	mpc->in_ops->destroy_cache(mpc);
1310 	mpc->eg_ops->destroy_cache(mpc);
1311 }
1312 
1313 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1314 				  struct mpoa_client *mpc)
1315 {
1316 	uint16_t holding_time;
1317 	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1318 
1319 	holding_time = msg->content.eg_info.holding_time;
1320 	dprintk("(%s) entry = %p, holding_time = %u\n",
1321 		mpc->dev->name, entry, holding_time);
1322 	if (entry == NULL && holding_time) {
1323 		entry = mpc->eg_ops->add_entry(msg, mpc);
1324 		mpc->eg_ops->put(entry);
1325 		return;
1326 	}
1327 	if (holding_time) {
1328 		mpc->eg_ops->update(entry, holding_time);
1329 		return;
1330 	}
1331 
1332 	write_lock_irq(&mpc->egress_lock);
1333 	mpc->eg_ops->remove_entry(entry, mpc);
1334 	write_unlock_irq(&mpc->egress_lock);
1335 
1336 	mpc->eg_ops->put(entry);
1337 }
1338 
1339 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1340 				   struct mpoa_client *mpc)
1341 {
1342 	struct lec_priv *priv;
1343 	int i, retval ;
1344 
1345 	uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1346 
1347 	tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
1348 	tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
1349 	tlv[5] = 0x02;                 /* MPOA client                      */
1350 	tlv[6] = 0x00;                 /* number of MPS MAC addresses      */
1351 
1352 	memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1353 	memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1354 
1355 	dprintk("(%s) setting MPC ctrl ATM address to",
1356 		mpc->dev ? mpc->dev->name : "<unknown>");
1357 	for (i = 7; i < sizeof(tlv); i++)
1358 		dprintk_cont(" %02x", tlv[i]);
1359 	dprintk_cont("\n");
1360 
1361 	if (mpc->dev) {
1362 		priv = netdev_priv(mpc->dev);
1363 		retval = priv->lane2_ops->associate_req(mpc->dev,
1364 							mpc->dev->dev_addr,
1365 							tlv, sizeof(tlv));
1366 		if (retval == 0)
1367 			pr_info("(%s) MPOA device type TLV association failed\n",
1368 				mpc->dev->name);
1369 		retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1370 		if (retval < 0)
1371 			pr_info("(%s) targetless LE_ARP request failed\n",
1372 				mpc->dev->name);
1373 	}
1374 }
1375 
1376 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1377 				  struct mpoa_client *client)
1378 {
1379 
1380 	if (client->number_of_mps_macs)
1381 		kfree(client->mps_macs);
1382 	client->number_of_mps_macs = 0;
1383 	client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1384 	if (client->mps_macs == NULL) {
1385 		pr_info("out of memory\n");
1386 		return;
1387 	}
1388 	client->number_of_mps_macs = 1;
1389 }
1390 
1391 /*
1392  * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1393  */
1394 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1395 {
1396 
1397 	eg_cache_entry *entry;
1398 	msg->type = SND_EGRESS_PURGE;
1399 
1400 
1401 	/* FIXME: This knows too much of the cache structure */
1402 	read_lock_irq(&mpc->egress_lock);
1403 	entry = mpc->eg_cache;
1404 	while (entry != NULL) {
1405 		msg->content.eg_info = entry->ctrl_info;
1406 		dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1407 		msg_to_mpoad(msg, mpc);
1408 		entry = entry->next;
1409 	}
1410 	read_unlock_irq(&mpc->egress_lock);
1411 
1412 	msg->type = action;
1413 	msg_to_mpoad(msg, mpc);
1414 }
1415 
1416 static void mpc_timer_refresh(void)
1417 {
1418 	mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1419 	mpc_timer.data = mpc_timer.expires;
1420 	mpc_timer.function = mpc_cache_check;
1421 	add_timer(&mpc_timer);
1422 }
1423 
1424 static void mpc_cache_check(unsigned long checking_time)
1425 {
1426 	struct mpoa_client *mpc = mpcs;
1427 	static unsigned long previous_resolving_check_time;
1428 	static unsigned long previous_refresh_time;
1429 
1430 	while (mpc != NULL) {
1431 		mpc->in_ops->clear_count(mpc);
1432 		mpc->eg_ops->clear_expired(mpc);
1433 		if (checking_time - previous_resolving_check_time >
1434 		    mpc->parameters.mpc_p4 * HZ) {
1435 			mpc->in_ops->check_resolving(mpc);
1436 			previous_resolving_check_time = checking_time;
1437 		}
1438 		if (checking_time - previous_refresh_time >
1439 		    mpc->parameters.mpc_p5 * HZ) {
1440 			mpc->in_ops->refresh(mpc);
1441 			previous_refresh_time = checking_time;
1442 		}
1443 		mpc = mpc->next;
1444 	}
1445 	mpc_timer_refresh();
1446 }
1447 
1448 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1449 			  unsigned long arg)
1450 {
1451 	int err = 0;
1452 	struct atm_vcc *vcc = ATM_SD(sock);
1453 
1454 	if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1455 		return -ENOIOCTLCMD;
1456 
1457 	if (!capable(CAP_NET_ADMIN))
1458 		return -EPERM;
1459 
1460 	switch (cmd) {
1461 	case ATMMPC_CTRL:
1462 		err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1463 		if (err >= 0)
1464 			sock->state = SS_CONNECTED;
1465 		break;
1466 	case ATMMPC_DATA:
1467 		err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1468 		break;
1469 	default:
1470 		break;
1471 	}
1472 	return err;
1473 }
1474 
1475 static struct atm_ioctl atm_ioctl_ops = {
1476 	.owner	= THIS_MODULE,
1477 	.ioctl	= atm_mpoa_ioctl,
1478 };
1479 
1480 static __init int atm_mpoa_init(void)
1481 {
1482 	register_atm_ioctl(&atm_ioctl_ops);
1483 
1484 	if (mpc_proc_init() != 0)
1485 		pr_info("failed to initialize /proc/mpoa\n");
1486 
1487 	pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1488 
1489 	return 0;
1490 }
1491 
1492 static void __exit atm_mpoa_cleanup(void)
1493 {
1494 	struct mpoa_client *mpc, *tmp;
1495 	struct atm_mpoa_qos *qos, *nextqos;
1496 	struct lec_priv *priv;
1497 
1498 	mpc_proc_clean();
1499 
1500 	del_timer(&mpc_timer);
1501 	unregister_netdevice_notifier(&mpoa_notifier);
1502 	deregister_atm_ioctl(&atm_ioctl_ops);
1503 
1504 	mpc = mpcs;
1505 	mpcs = NULL;
1506 	while (mpc != NULL) {
1507 		tmp = mpc->next;
1508 		if (mpc->dev != NULL) {
1509 			stop_mpc(mpc);
1510 			priv = netdev_priv(mpc->dev);
1511 			if (priv->lane2_ops != NULL)
1512 				priv->lane2_ops->associate_indicator = NULL;
1513 		}
1514 		ddprintk("about to clear caches\n");
1515 		mpc->in_ops->destroy_cache(mpc);
1516 		mpc->eg_ops->destroy_cache(mpc);
1517 		ddprintk("caches cleared\n");
1518 		kfree(mpc->mps_macs);
1519 		memset(mpc, 0, sizeof(struct mpoa_client));
1520 		ddprintk("about to kfree %p\n", mpc);
1521 		kfree(mpc);
1522 		ddprintk("next mpc is at %p\n", tmp);
1523 		mpc = tmp;
1524 	}
1525 
1526 	qos = qos_head;
1527 	qos_head = NULL;
1528 	while (qos != NULL) {
1529 		nextqos = qos->next;
1530 		dprintk("freeing qos entry %p\n", qos);
1531 		kfree(qos);
1532 		qos = nextqos;
1533 	}
1534 }
1535 
1536 module_init(atm_mpoa_init);
1537 module_exit(atm_mpoa_cleanup);
1538 
1539 MODULE_LICENSE("GPL");
1540