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