dn_dev.c 32.3 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Device Layer
 *
 * Authors:     Steve Whitehouse <SteveW@ACM.org>
 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
 *
 * Changes:
 *          Steve Whitehouse : Devices now see incoming frames so they
 *                             can mark on who it came from.
 *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
 *                             can now have a device specific setup func.
 *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
 *          Steve Whitehouse : Fixed bug which sometimes killed timer
 *          Steve Whitehouse : Multiple ifaddr support
 *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
 *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
 *          Steve Whitehouse : Removed timer1 - it's a user space issue now
 *         Patrick Caulfield : Fixed router hello message format
 *          Steve Whitehouse : Got rid of constant sizes for blksize for
 *                             devices. All mtu based now.
 */

27
#include <linux/capability.h>
Linus Torvalds's avatar
Linus Torvalds committed
28 29 30 31 32 33 34 35 36
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/timer.h>
#include <linux/string.h>
37
#include <linux/if_addr.h>
Linus Torvalds's avatar
Linus Torvalds committed
38 39 40 41 42
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
43
#include <linux/slab.h>
Himangi Saraogi's avatar
Himangi Saraogi committed
44
#include <linux/jiffies.h>
Linus Torvalds's avatar
Linus Torvalds committed
45
#include <asm/uaccess.h>
46
#include <net/net_namespace.h>
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
50
#include <net/fib_rules.h>
51
#include <net/netlink.h>
Linus Torvalds's avatar
Linus Torvalds committed
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
#include <net/dn.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>
#include <net/dn_neigh.h>
#include <net/dn_fib.h>

#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))

static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};

extern struct neigh_table dn_neigh_table;

/*
 * decnet_address is kept in network order.
 */
70
__le16 decnet_address = 0;
Linus Torvalds's avatar
Linus Torvalds committed
71

72
static DEFINE_SPINLOCK(dndev_lock);
Linus Torvalds's avatar
Linus Torvalds committed
73
static struct net_device *decnet_default_device;
74
static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
Linus Torvalds's avatar
Linus Torvalds committed
75 76 77

static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
static void dn_dev_delete(struct net_device *dev);
78
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
Linus Torvalds's avatar
Linus Torvalds committed
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147

static int dn_eth_up(struct net_device *);
static void dn_eth_down(struct net_device *);
static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);

static struct dn_dev_parms dn_dev_list[] =  {
{
	.type =		ARPHRD_ETHER, /* Ethernet */
	.mode =		DN_DEV_BCAST,
	.state =	DN_DEV_S_RU,
	.t2 =		1,
	.t3 =		10,
	.name =		"ethernet",
	.up =		dn_eth_up,
	.down = 	dn_eth_down,
	.timer3 =	dn_send_brd_hello,
},
{
	.type =		ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
	.mode =		DN_DEV_BCAST,
	.state =	DN_DEV_S_RU,
	.t2 =		1,
	.t3 =		10,
	.name =		"ipgre",
	.timer3 =	dn_send_brd_hello,
},
#if 0
{
	.type =		ARPHRD_X25, /* Bog standard X.25 */
	.mode =		DN_DEV_UCAST,
	.state =	DN_DEV_S_DS,
	.t2 =		1,
	.t3 =		120,
	.name =		"x25",
	.timer3 =	dn_send_ptp_hello,
},
#endif
#if 0
{
	.type =		ARPHRD_PPP, /* DECnet over PPP */
	.mode =		DN_DEV_BCAST,
	.state =	DN_DEV_S_RU,
	.t2 =		1,
	.t3 =		10,
	.name =		"ppp",
	.timer3 =	dn_send_brd_hello,
},
#endif
{
	.type =		ARPHRD_DDCMP, /* DECnet over DDCMP */
	.mode =		DN_DEV_UCAST,
	.state =	DN_DEV_S_DS,
	.t2 =		1,
	.t3 =		120,
	.name =		"ddcmp",
	.timer3 =	dn_send_ptp_hello,
},
{
	.type =		ARPHRD_LOOPBACK, /* Loopback interface - always last */
	.mode =		DN_DEV_BCAST,
	.state =	DN_DEV_S_RU,
	.t2 =		1,
	.t3 =		10,
	.name =		"loopback",
	.timer3 =	dn_send_brd_hello,
}
};

148
#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
Linus Torvalds's avatar
Linus Torvalds committed
149

150
#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
Linus Torvalds's avatar
Linus Torvalds committed
151 152 153 154 155 156 157 158 159 160 161

#ifdef CONFIG_SYSCTL

static int min_t2[] = { 1 };
static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
static int min_t3[] = { 1 };
static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */

static int min_priority[1];
static int max_priority[] = { 127 }; /* From DECnet spec */

162
static int dn_forwarding_proc(struct ctl_table *, int,
Linus Torvalds's avatar
Linus Torvalds committed
163 164 165
			void __user *, size_t *, loff_t *);
static struct dn_dev_sysctl_table {
	struct ctl_table_header *sysctl_header;
166
	struct ctl_table dn_dev_vars[5];
Linus Torvalds's avatar
Linus Torvalds committed
167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212
} dn_dev_sysctl = {
	NULL,
	{
	{
		.procname = "forwarding",
		.data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = dn_forwarding_proc,
	},
	{
		.procname = "priority",
		.data = (void *)DN_DEV_PARMS_OFFSET(priority),
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_priority,
		.extra2 = &max_priority
	},
	{
		.procname = "t2",
		.data = (void *)DN_DEV_PARMS_OFFSET(t2),
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_t2,
		.extra2 = &max_t2
	},
	{
		.procname = "t3",
		.data = (void *)DN_DEV_PARMS_OFFSET(t3),
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_t3,
		.extra2 = &max_t3
	},
	{0}
	},
};

static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
	struct dn_dev_sysctl_table *t;
	int i;

213
	char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
214

215
	t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
216 217 218 219 220 221 222 223
	if (t == NULL)
		return;

	for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
		long offset = (long)t->dn_dev_vars[i].data;
		t->dn_dev_vars[i].data = ((char *)parms) + offset;
	}

224 225
	snprintf(path, sizeof(path), "net/decnet/conf/%s",
		dev? dev->name : parms->name);
Linus Torvalds's avatar
Linus Torvalds committed
226 227 228

	t->dn_dev_vars[0].extra1 = (void *)dev;

229
	t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
Linus Torvalds's avatar
Linus Torvalds committed
230 231 232 233 234 235 236 237 238 239 240
	if (t->sysctl_header == NULL)
		kfree(t);
	else
		parms->sysctl = t;
}

static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
	if (parms->sysctl) {
		struct dn_dev_sysctl_table *t = parms->sysctl;
		parms->sysctl = NULL;
241
		unregister_net_sysctl_table(t->sysctl_header);
Linus Torvalds's avatar
Linus Torvalds committed
242 243 244 245
		kfree(t);
	}
}

246
static int dn_forwarding_proc(struct ctl_table *table, int write,
Linus Torvalds's avatar
Linus Torvalds committed
247 248 249 250 251 252 253 254 255 256 257 258
				void __user *buffer,
				size_t *lenp, loff_t *ppos)
{
#ifdef CONFIG_DECNET_ROUTER
	struct net_device *dev = table->extra1;
	struct dn_dev *dn_db;
	int err;
	int tmp, old;

	if (table->extra1 == NULL)
		return -EINVAL;

259
	dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
260 261
	old = dn_db->parms.forwarding;

262
	err = proc_dointvec(table, write, buffer, lenp, ppos);
Linus Torvalds's avatar
Linus Torvalds committed
263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318

	if ((err >= 0) && write) {
		if (dn_db->parms.forwarding < 0)
			dn_db->parms.forwarding = 0;
		if (dn_db->parms.forwarding > 2)
			dn_db->parms.forwarding = 2;
		/*
		 * What an ugly hack this is... its works, just. It
		 * would be nice if sysctl/proc were just that little
		 * bit more flexible so I don't have to write a special
		 * routine, or suffer hacks like this - SJW
		 */
		tmp = dn_db->parms.forwarding;
		dn_db->parms.forwarding = old;
		if (dn_db->parms.down)
			dn_db->parms.down(dev);
		dn_db->parms.forwarding = tmp;
		if (dn_db->parms.up)
			dn_db->parms.up(dev);
	}

	return err;
#else
	return -EINVAL;
#endif
}

#else /* CONFIG_SYSCTL */
static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
}
static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
}

#endif /* CONFIG_SYSCTL */

static inline __u16 mtu2blksize(struct net_device *dev)
{
	u32 blksize = dev->mtu;
	if (blksize > 0xffff)
		blksize = 0xffff;

	if (dev->type == ARPHRD_ETHER ||
	    dev->type == ARPHRD_PPP ||
	    dev->type == ARPHRD_IPGRE ||
	    dev->type == ARPHRD_LOOPBACK)
		blksize -= 2;

	return (__u16)blksize;
}

static struct dn_ifaddr *dn_dev_alloc_ifa(void)
{
	struct dn_ifaddr *ifa;

319
	ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
320 321 322 323

	return ifa;
}

324
static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
Linus Torvalds's avatar
Linus Torvalds committed
325
{
326
	kfree_rcu(ifa, rcu);
327 328 329 330 331
}

static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
{
	struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
Linus Torvalds's avatar
Linus Torvalds committed
332 333 334 335 336 337 338 339
	unsigned char mac_addr[6];
	struct net_device *dev = dn_db->dev;

	ASSERT_RTNL();

	*ifap = ifa1->ifa_next;

	if (dn_db->dev->type == ARPHRD_ETHER) {
340
		if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
Linus Torvalds's avatar
Linus Torvalds committed
341
			dn_dn2eth(mac_addr, ifa1->ifa_local);
342
			dev_mc_del(dev, mac_addr);
Linus Torvalds's avatar
Linus Torvalds committed
343 344 345
		}
	}

346
	dn_ifaddr_notify(RTM_DELADDR, ifa1);
347
	blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
Linus Torvalds's avatar
Linus Torvalds committed
348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
	if (destroy) {
		dn_dev_free_ifa(ifa1);

		if (dn_db->ifa_list == NULL)
			dn_dev_delete(dn_db->dev);
	}
}

static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
	struct net_device *dev = dn_db->dev;
	struct dn_ifaddr *ifa1;
	unsigned char mac_addr[6];

	ASSERT_RTNL();

364
	/* Check for duplicates */
365 366 367
	for (ifa1 = rtnl_dereference(dn_db->ifa_list);
	     ifa1 != NULL;
	     ifa1 = rtnl_dereference(ifa1->ifa_next)) {
Linus Torvalds's avatar
Linus Torvalds committed
368 369 370 371 372
		if (ifa1->ifa_local == ifa->ifa_local)
			return -EEXIST;
	}

	if (dev->type == ARPHRD_ETHER) {
373
		if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
Linus Torvalds's avatar
Linus Torvalds committed
374
			dn_dn2eth(mac_addr, ifa->ifa_local);
375
			dev_mc_add(dev, mac_addr);
Linus Torvalds's avatar
Linus Torvalds committed
376 377 378 379
		}
	}

	ifa->ifa_next = dn_db->ifa_list;
380
	rcu_assign_pointer(dn_db->ifa_list, ifa);
Linus Torvalds's avatar
Linus Torvalds committed
381

382
	dn_ifaddr_notify(RTM_NEWADDR, ifa);
383
	blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
Linus Torvalds's avatar
Linus Torvalds committed
384 385 386 387 388 389

	return 0;
}

static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
{
390
	struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418
	int rv;

	if (dn_db == NULL) {
		int err;
		dn_db = dn_dev_create(dev, &err);
		if (dn_db == NULL)
			return err;
	}

	ifa->ifa_dev = dn_db;

	if (dev->flags & IFF_LOOPBACK)
		ifa->ifa_scope = RT_SCOPE_HOST;

	rv = dn_dev_insert_ifa(dn_db, ifa);
	if (rv)
		dn_dev_free_ifa(ifa);
	return rv;
}


int dn_dev_ioctl(unsigned int cmd, void __user *arg)
{
	char buffer[DN_IFREQ_SIZE];
	struct ifreq *ifr = (struct ifreq *)buffer;
	struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
	struct dn_dev *dn_db;
	struct net_device *dev;
419 420
	struct dn_ifaddr *ifa = NULL;
	struct dn_ifaddr __rcu **ifap = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
421 422 423 424 425 426
	int ret = 0;

	if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
		return -EFAULT;
	ifr->ifr_name[IFNAMSIZ-1] = 0;

427
	dev_load(&init_net, ifr->ifr_name);
Linus Torvalds's avatar
Linus Torvalds committed
428

429 430 431 432 433 434 435
	switch (cmd) {
	case SIOCGIFADDR:
		break;
	case SIOCSIFADDR:
		if (!capable(CAP_NET_ADMIN))
			return -EACCES;
		if (sdn->sdn_family != AF_DECnet)
Linus Torvalds's avatar
Linus Torvalds committed
436
			return -EINVAL;
437 438 439
		break;
	default:
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
440 441 442 443
	}

	rtnl_lock();

444
	if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
445 446 447 448
		ret = -ENODEV;
		goto done;
	}

449 450 451 452
	if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
		for (ifap = &dn_db->ifa_list;
		     (ifa = rtnl_dereference(*ifap)) != NULL;
		     ifap = &ifa->ifa_next)
Linus Torvalds's avatar
Linus Torvalds committed
453 454 455 456 457 458 459 460 461
			if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
				break;
	}

	if (ifa == NULL && cmd != SIOCSIFADDR) {
		ret = -EADDRNOTAVAIL;
		goto done;
	}

462 463 464 465 466 467 468 469 470 471
	switch (cmd) {
	case SIOCGIFADDR:
		*((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
		goto rarok;

	case SIOCSIFADDR:
		if (!ifa) {
			if ((ifa = dn_dev_alloc_ifa()) == NULL) {
				ret = -ENOBUFS;
				break;
Linus Torvalds's avatar
Linus Torvalds committed
472
			}
473 474 475 476 477 478
			memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
		} else {
			if (ifa->ifa_local == dn_saddr2dn(sdn))
				break;
			dn_dev_del_ifa(dn_db, ifap, 0);
		}
Linus Torvalds's avatar
Linus Torvalds committed
479

480
		ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
Linus Torvalds's avatar
Linus Torvalds committed
481

482
		ret = dn_dev_set_ifa(dev, ifa);
Linus Torvalds's avatar
Linus Torvalds committed
483 484 485 486 487 488 489 490 491 492 493 494 495 496
	}
done:
	rtnl_unlock();

	return ret;
rarok:
	if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
		ret = -EFAULT;
	goto done;
}

struct net_device *dn_dev_get_default(void)
{
	struct net_device *dev;
497 498

	spin_lock(&dndev_lock);
Linus Torvalds's avatar
Linus Torvalds committed
499 500 501 502 503 504 505
	dev = decnet_default_device;
	if (dev) {
		if (dev->dn_ptr)
			dev_hold(dev);
		else
			dev = NULL;
	}
506 507
	spin_unlock(&dndev_lock);

Linus Torvalds's avatar
Linus Torvalds committed
508 509 510 511 512 513 514 515 516
	return dev;
}

int dn_dev_set_default(struct net_device *dev, int force)
{
	struct net_device *old = NULL;
	int rv = -EBUSY;
	if (!dev->dn_ptr)
		return -ENODEV;
517 518

	spin_lock(&dndev_lock);
Linus Torvalds's avatar
Linus Torvalds committed
519 520 521 522 523
	if (force || decnet_default_device == NULL) {
		old = decnet_default_device;
		decnet_default_device = dev;
		rv = 0;
	}
524 525
	spin_unlock(&dndev_lock);

Linus Torvalds's avatar
Linus Torvalds committed
526
	if (old)
Patrick Caulfield's avatar
Patrick Caulfield committed
527
		dev_put(old);
Linus Torvalds's avatar
Linus Torvalds committed
528 529 530 531 532
	return rv;
}

static void dn_dev_check_default(struct net_device *dev)
{
533
	spin_lock(&dndev_lock);
Linus Torvalds's avatar
Linus Torvalds committed
534 535 536 537 538
	if (dev == decnet_default_device) {
		decnet_default_device = NULL;
	} else {
		dev = NULL;
	}
539 540
	spin_unlock(&dndev_lock);

Linus Torvalds's avatar
Linus Torvalds committed
541 542 543 544
	if (dev)
		dev_put(dev);
}

545 546 547
/*
 * Called with RTNL
 */
Linus Torvalds's avatar
Linus Torvalds committed
548 549 550 551
static struct dn_dev *dn_dev_by_index(int ifindex)
{
	struct net_device *dev;
	struct dn_dev *dn_dev = NULL;
552 553 554

	dev = __dev_get_by_index(&init_net, ifindex);
	if (dev)
555
		dn_dev = rtnl_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
556 557 558 559

	return dn_dev;
}

560
static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
561 562 563 564
	[IFA_ADDRESS]		= { .type = NLA_U16 },
	[IFA_LOCAL]		= { .type = NLA_U16 },
	[IFA_LABEL]		= { .type = NLA_STRING,
				    .len = IFNAMSIZ - 1 },
565
	[IFA_FLAGS]		= { .type = NLA_U32 },
566 567
};

568
static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds's avatar
Linus Torvalds committed
569
{
570
	struct net *net = sock_net(skb->sk);
571
	struct nlattr *tb[IFA_MAX+1];
Linus Torvalds's avatar
Linus Torvalds committed
572
	struct dn_dev *dn_db;
573
	struct ifaddrmsg *ifm;
574 575
	struct dn_ifaddr *ifa;
	struct dn_ifaddr __rcu **ifap;
576 577
	int err = -EINVAL;

578
	if (!netlink_capable(skb, CAP_NET_ADMIN))
579 580
		return -EPERM;

581
	if (!net_eq(net, &init_net))
582
		goto errout;
583 584 585 586

	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
	if (err < 0)
		goto errout;
Linus Torvalds's avatar
Linus Torvalds committed
587

588
	err = -ENODEV;
589
	ifm = nlmsg_data(nlh);
Linus Torvalds's avatar
Linus Torvalds committed
590
	if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
591 592
		goto errout;

593
	err = -EADDRNOTAVAIL;
594 595 596
	for (ifap = &dn_db->ifa_list;
	     (ifa = rtnl_dereference(*ifap)) != NULL;
	     ifap = &ifa->ifa_next) {
597 598 599
		if (tb[IFA_LOCAL] &&
		    nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
			continue;
Linus Torvalds's avatar
Linus Torvalds committed
600

601
		if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
Linus Torvalds's avatar
Linus Torvalds committed
602 603 604 605 606 607
			continue;

		dn_dev_del_ifa(dn_db, ifap, 1);
		return 0;
	}

608 609
errout:
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
610 611
}

612
static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds's avatar
Linus Torvalds committed
613
{
614
	struct net *net = sock_net(skb->sk);
615
	struct nlattr *tb[IFA_MAX+1];
Linus Torvalds's avatar
Linus Torvalds committed
616 617
	struct net_device *dev;
	struct dn_dev *dn_db;
618
	struct ifaddrmsg *ifm;
Linus Torvalds's avatar
Linus Torvalds committed
619
	struct dn_ifaddr *ifa;
620 621
	int err;

622
	if (!netlink_capable(skb, CAP_NET_ADMIN))
623 624
		return -EPERM;

625
	if (!net_eq(net, &init_net))
626 627
		return -EINVAL;

628 629 630
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
631

632
	if (tb[IFA_LOCAL] == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
633 634
		return -EINVAL;

635
	ifm = nlmsg_data(nlh);
636
	if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
637 638
		return -ENODEV;

639
	if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
640 641 642 643
		dn_db = dn_dev_create(dev, &err);
		if (!dn_db)
			return err;
	}
644

Linus Torvalds's avatar
Linus Torvalds committed
645 646 647
	if ((ifa = dn_dev_alloc_ifa()) == NULL)
		return -ENOBUFS;

648 649 650 651 652
	if (tb[IFA_ADDRESS] == NULL)
		tb[IFA_ADDRESS] = tb[IFA_LOCAL];

	ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
	ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
653 654
	ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
					 ifm->ifa_flags;
Linus Torvalds's avatar
Linus Torvalds committed
655 656
	ifa->ifa_scope = ifm->ifa_scope;
	ifa->ifa_dev = dn_db;
657 658 659

	if (tb[IFA_LABEL])
		nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
Linus Torvalds's avatar
Linus Torvalds committed
660 661 662
	else
		memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);

663 664
	err = dn_dev_insert_ifa(dn_db, ifa);
	if (err)
Linus Torvalds's avatar
Linus Torvalds committed
665
		dn_dev_free_ifa(ifa);
666 667

	return err;
Linus Torvalds's avatar
Linus Torvalds committed
668 669
}

670 671 672 673 674
static inline size_t dn_ifaddr_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
	       + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
	       + nla_total_size(2) /* IFA_ADDRESS */
675 676
	       + nla_total_size(2) /* IFA_LOCAL */
	       + nla_total_size(4); /* IFA_FLAGS */
677 678
}

679
static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
680
			     u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds's avatar
Linus Torvalds committed
681 682 683
{
	struct ifaddrmsg *ifm;
	struct nlmsghdr *nlh;
684
	u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
Linus Torvalds's avatar
Linus Torvalds committed
685

686
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
687
	if (nlh == NULL)
688
		return -EMSGSIZE;
Linus Torvalds's avatar
Linus Torvalds committed
689

690
	ifm = nlmsg_data(nlh);
Linus Torvalds's avatar
Linus Torvalds committed
691 692
	ifm->ifa_family = AF_DECnet;
	ifm->ifa_prefixlen = 16;
693
	ifm->ifa_flags = ifa_flags;
Linus Torvalds's avatar
Linus Torvalds committed
694 695
	ifm->ifa_scope = ifa->ifa_scope;
	ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
696

697 698 699 700 701
	if ((ifa->ifa_address &&
	     nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
	    (ifa->ifa_local &&
	     nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
	    (ifa->ifa_label[0] &&
702 703
	     nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
	     nla_put_u32(skb, IFA_FLAGS, ifa_flags))
704
		goto nla_put_failure;
705 706
	nlmsg_end(skb, nlh);
	return 0;
707 708

nla_put_failure:
709 710
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
Linus Torvalds's avatar
Linus Torvalds committed
711 712
}

713
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
Linus Torvalds's avatar
Linus Torvalds committed
714 715
{
	struct sk_buff *skb;
716
	int err = -ENOBUFS;
Linus Torvalds's avatar
Linus Torvalds committed
717

718
	skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
719 720 721
	if (skb == NULL)
		goto errout;

722
	err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
723 724 725 726 727 728
	if (err < 0) {
		/* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
729 730
	rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
	return;
731 732
errout:
	if (err < 0)
733
		rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
Linus Torvalds's avatar
Linus Torvalds committed
734 735
}

736
static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds's avatar
Linus Torvalds committed
737
{
738
	struct net *net = sock_net(skb->sk);
739
	int idx, dn_idx = 0, skip_ndevs, skip_naddr;
Linus Torvalds's avatar
Linus Torvalds committed
740 741 742 743
	struct net_device *dev;
	struct dn_dev *dn_db;
	struct dn_ifaddr *ifa;

744
	if (!net_eq(net, &init_net))
745 746
		return 0;

747 748 749
	skip_ndevs = cb->args[0];
	skip_naddr = cb->args[1];

750
	idx = 0;
751 752
	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
753
		if (idx < skip_ndevs)
754
			goto cont;
755 756 757 758 759 760
		else if (idx > skip_ndevs) {
			/* Only skip over addresses for first dev dumped
			 * in this iteration (idx == skip_ndevs) */
			skip_naddr = 0;
		}

761
		if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
762
			goto cont;
Linus Torvalds's avatar
Linus Torvalds committed
763

764 765
		for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
		     ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
766
			if (dn_idx < skip_naddr)
767
				continue;
Linus Torvalds's avatar
Linus Torvalds committed
768

769
			if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
770 771
					      cb->nlh->nlmsg_seq, RTM_NEWADDR,
					      NLM_F_MULTI) < 0)
Linus Torvalds's avatar
Linus Torvalds committed
772 773
				goto done;
		}
774 775
cont:
		idx++;
Linus Torvalds's avatar
Linus Torvalds committed
776 777
	}
done:
778
	rcu_read_unlock();
Linus Torvalds's avatar
Linus Torvalds committed
779 780 781 782 783 784
	cb->args[0] = idx;
	cb->args[1] = dn_idx;

	return skb->len;
}

785
static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
Linus Torvalds's avatar
Linus Torvalds committed
786
{
787
	struct dn_dev *dn_db;
Linus Torvalds's avatar
Linus Torvalds committed
788 789
	struct dn_ifaddr *ifa;
	int rv = -ENODEV;
790

791 792
	rcu_read_lock();
	dn_db = rcu_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
793 794
	if (dn_db == NULL)
		goto out;
795

796
	ifa = rcu_dereference(dn_db->ifa_list);
Linus Torvalds's avatar
Linus Torvalds committed
797 798 799 800 801
	if (ifa != NULL) {
		*addr = ifa->ifa_local;
		rv = 0;
	}
out:
802
	rcu_read_unlock();
Linus Torvalds's avatar
Linus Torvalds committed
803 804 805
	return rv;
}

806
/*
Linus Torvalds's avatar
Linus Torvalds committed
807 808 809 810 811 812 813 814 815
 * Find a default address to bind to.
 *
 * This is one of those areas where the initial VMS concepts don't really
 * map onto the Linux concepts, and since we introduced multiple addresses
 * per interface we have to cope with slightly odd ways of finding out what
 * "our address" really is. Mostly it's not a problem; for this we just guess
 * a sensible default. Eventually the routing code will take care of all the
 * nasties for us I hope.
 */
816
int dn_dev_bind_default(__le16 *addr)
Linus Torvalds's avatar
Linus Torvalds committed
817 818 819 820 821 822 823 824
{
	struct net_device *dev;
	int rv;
	dev = dn_dev_get_default();
last_chance:
	if (dev) {
		rv = dn_dev_get_first(dev, addr);
		dev_put(dev);
825
		if (rv == 0 || dev == init_net.loopback_dev)
Linus Torvalds's avatar
Linus Torvalds committed
826 827
			return rv;
	}
828
	dev = init_net.loopback_dev;
Linus Torvalds's avatar
Linus Torvalds committed
829 830 831 832 833 834
	dev_hold(dev);
	goto last_chance;
}

static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
835 836 837
	struct endnode_hello_message *msg;
	struct sk_buff *skb = NULL;
	__le16 *pktlen;
838
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
839

840
	if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
841 842
		return;

843
	skb->dev = dev;
Linus Torvalds's avatar
Linus Torvalds committed
844

845
	msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
Linus Torvalds's avatar
Linus Torvalds committed
846

847 848
	msg->msgflg  = 0x0D;
	memcpy(msg->tiver, dn_eco_version, 3);
Linus Torvalds's avatar
Linus Torvalds committed
849
	dn_dn2eth(msg->id, ifa->ifa_local);
850
	msg->iinfo   = DN_RT_INFO_ENDN;
851
	msg->blksize = cpu_to_le16(mtu2blksize(dev));
852 853 854
	msg->area    = 0x00;
	memset(msg->seed, 0, 8);
	memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
Linus Torvalds's avatar
Linus Torvalds committed
855 856 857 858 859 860

	if (dn_db->router) {
		struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
		dn_dn2eth(msg->neighbor, dn->addr);
	}

861
	msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
862 863 864 865 866
	msg->mpd     = 0x00;
	msg->datalen = 0x02;
	memset(msg->data, 0xAA, 2);

	pktlen = (__le16 *)skb_push(skb,2);
867
	*pktlen = cpu_to_le16(skb->len - 2);
Linus Torvalds's avatar
Linus Torvalds committed
868

869
	skb_reset_network_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
870 871 872 873 874 875 876 877 878 879

	dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
}


#define DRDELAY (5 * HZ)

static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
	/* First check time since device went up */
Himangi Saraogi's avatar
Himangi Saraogi committed
880
	if (time_before(jiffies, dn_db->uptime + DRDELAY))
Linus Torvalds's avatar
Linus Torvalds committed
881 882 883 884 885 886 887 888 889 890 891 892 893 894
		return 0;

	/* If there is no router, then yes... */
	if (!dn_db->router)
		return 1;

	/* otherwise only if we have a higher priority or.. */
	if (dn->priority < dn_db->parms.priority)
		return 1;

	/* if we have equal priority and a higher node number */
	if (dn->priority != dn_db->parms.priority)
		return 0;

895
	if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
Linus Torvalds's avatar
Linus Torvalds committed
896 897 898 899 900 901 902 903
		return 1;

	return 0;
}

static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
	int n;
904
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
905 906 907 908 909
	struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
	struct sk_buff *skb;
	size_t size;
	unsigned char *ptr;
	unsigned char *i1, *i2;
910
	__le16 *pktlen;
Linus Torvalds's avatar
Linus Torvalds committed
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
	char *src;

	if (mtu2blksize(dev) < (26 + 7))
		return;

	n = mtu2blksize(dev) - 26;
	n /= 7;

	if (n > 32)
		n = 32;

	size = 2 + 26 + 7 * n;

	if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
		return;

	skb->dev = dev;
	ptr = skb_put(skb, size);

	*ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
	*ptr++ = 2; /* ECO */
	*ptr++ = 0;
	*ptr++ = 0;
	dn_dn2eth(ptr, ifa->ifa_local);
	src = ptr;
	ptr += ETH_ALEN;
937
	*ptr++ = dn_db->parms.forwarding == 1 ?
Linus Torvalds's avatar
Linus Torvalds committed
938
			DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
939
	*((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
Linus Torvalds's avatar
Linus Torvalds committed
940
	ptr += 2;
941
	*ptr++ = dn_db->parms.priority; /* Priority */
Linus Torvalds's avatar
Linus Torvalds committed
942
	*ptr++ = 0; /* Area: Reserved */
943
	*((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
Linus Torvalds's avatar
Linus Torvalds committed
944 945 946 947 948 949 950 951 952 953 954 955 956 957
	ptr += 2;
	*ptr++ = 0; /* MPD: Reserved */
	i1 = ptr++;
	memset(ptr, 0, 7); /* Name: Reserved */
	ptr += 7;
	i2 = ptr++;

	n = dn_neigh_elist(dev, ptr, n);

	*i2 = 7 * n;
	*i1 = 8 + *i2;

	skb_trim(skb, (27 + *i2));

958
	pktlen = (__le16 *)skb_push(skb, 2);
959
	*pktlen = cpu_to_le16(skb->len - 2);
Linus Torvalds's avatar
Linus Torvalds committed
960

961
	skb_reset_network_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
962 963 964 965 966 967 968 969 970 971 972 973 974

	if (dn_am_i_a_router(dn, dn_db, ifa)) {
		struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
		if (skb2) {
			dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
		}
	}

	dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}

static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
975
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999

	if (dn_db->parms.forwarding == 0)
		dn_send_endnode_hello(dev, ifa);
	else
		dn_send_router_hello(dev, ifa);
}

static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
	int tdlen = 16;
	int size = dev->hard_header_len + 2 + 4 + tdlen;
	struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
	int i;
	unsigned char *ptr;
	char src[ETH_ALEN];

	if (skb == NULL)
		return ;

	skb->dev = dev;
	skb_push(skb, dev->hard_header_len);
	ptr = skb_put(skb, 2 + 4 + tdlen);

	*ptr++ = DN_RT_PKT_HELO;
1000
	*((__le16 *)ptr) = ifa->ifa_local;
Linus Torvalds's avatar
Linus Torvalds committed
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
	ptr += 2;
	*ptr++ = tdlen;

	for(i = 0; i < tdlen; i++)
		*ptr++ = 0252;

	dn_dn2eth(src, ifa->ifa_local);
	dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}

static int dn_eth_up(struct net_device *dev)
{
1013
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1014 1015

	if (dn_db->parms.forwarding == 0)
1016
		dev_mc_add(dev, dn_rt_all_end_mcast);
Linus Torvalds's avatar
Linus Torvalds committed
1017
	else
1018
		dev_mc_add(dev, dn_rt_all_rt_mcast);
Linus Torvalds's avatar
Linus Torvalds committed
1019 1020 1021 1022 1023 1024 1025 1026

	dn_db->use_long = 1;

	return 0;
}

static void dn_eth_down(struct net_device *dev)
{
1027
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1028 1029

	if (dn_db->parms.forwarding == 0)
1030
		dev_mc_del(dev, dn_rt_all_end_mcast);
Linus Torvalds's avatar
Linus Torvalds committed
1031
	else
1032
		dev_mc_del(dev, dn_rt_all_rt_mcast);
Linus Torvalds's avatar
Linus Torvalds committed
1033 1034 1035 1036 1037 1038 1039
}

static void dn_dev_set_timer(struct net_device *dev);

static void dn_dev_timer_func(unsigned long arg)
{
	struct net_device *dev = (struct net_device *)arg;
1040
	struct dn_dev *dn_db;
Linus Torvalds's avatar
Linus Torvalds committed
1041 1042
	struct dn_ifaddr *ifa;

1043 1044
	rcu_read_lock();
	dn_db = rcu_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1045 1046
	if (dn_db->t3 <= dn_db->parms.t2) {
		if (dn_db->parms.timer3) {
1047 1048 1049
			for (ifa = rcu_dereference(dn_db->ifa_list);
			     ifa;
			     ifa = rcu_dereference(ifa->ifa_next)) {
Linus Torvalds's avatar
Linus Torvalds committed
1050 1051 1052 1053 1054 1055 1056 1057
				if (!(ifa->ifa_flags & IFA_F_SECONDARY))
					dn_db->parms.timer3(dev, ifa);
			}
		}
		dn_db->t3 = dn_db->parms.t3;
	} else {
		dn_db->t3 -= dn_db->parms.t2;
	}
1058
	rcu_read_unlock();
Linus Torvalds's avatar
Linus Torvalds committed
1059 1060 1061 1062 1063
	dn_dev_set_timer(dev);
}

static void dn_dev_set_timer(struct net_device *dev)
{
1064
	struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075

	if (dn_db->parms.t2 > dn_db->parms.t3)
		dn_db->parms.t2 = dn_db->parms.t3;

	dn_db->timer.data = (unsigned long)dev;
	dn_db->timer.function = dn_dev_timer_func;
	dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);

	add_timer(&dn_db->timer);
}

Roel Kluin's avatar
Roel Kluin committed
1076
static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
Linus Torvalds's avatar
Linus Torvalds committed
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
{
	int i;
	struct dn_dev_parms *p = dn_dev_list;
	struct dn_dev *dn_db;

	for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
		if (p->type == dev->type)
			break;
	}

	*err = -ENODEV;
	if (i == DN_DEV_LIST_SIZE)
		return NULL;

	*err = -ENOBUFS;
1092
	if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
1093 1094 1095
		return NULL;

	memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1096

1097
	rcu_assign_pointer(dev->dn_ptr, dn_db);
Linus Torvalds's avatar
Linus Torvalds committed
1098 1099 1100 1101
	dn_db->dev = dev;
	init_timer(&dn_db->timer);

	dn_db->uptime = jiffies;
1102 1103 1104

	dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
	if (!dn_db->neigh_parms) {
1105
		RCU_INIT_POINTER(dev->dn_ptr, NULL);
1106 1107 1108 1109
		kfree(dn_db);
		return NULL;
	}

Linus Torvalds's avatar
Linus Torvalds committed
1110 1111
	if (dn_db->parms.up) {
		if (dn_db->parms.up(dev) < 0) {
1112
			neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
Linus Torvalds's avatar
Linus Torvalds committed
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
			dev->dn_ptr = NULL;
			kfree(dn_db);
			return NULL;
		}
	}

	dn_dev_sysctl_register(dev, &dn_db->parms);

	dn_dev_set_timer(dev);

	*err = 0;
	return dn_db;
}


/*
 * This processes a device up event. We only start up
 * the loopback device & ethernet devices with correct
1131
 * MAC addresses automatically. Others must be started
Linus Torvalds's avatar
Linus Torvalds committed
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
 * specifically.
 *
 * FIXME: How should we configure the loopback address ? If we could dispense
 * with using decnet_address here and for autobind, it will be one less thing
 * for users to worry about setting up.
 */

void dn_dev_up(struct net_device *dev)
{
	struct dn_ifaddr *ifa;
1142
	__le16 addr = decnet_address;
Linus Torvalds's avatar
Linus Torvalds committed
1143
	int maybe_default = 0;
1144
	struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164

	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
		return;

	/*
	 * Need to ensure that loopback device has a dn_db attached to it
	 * to allow creation of neighbours against it, even though it might
	 * not have a local address of its own. Might as well do the same for
	 * all autoconfigured interfaces.
	 */
	if (dn_db == NULL) {
		int err;
		dn_db = dn_dev_create(dev, &err);
		if (dn_db == NULL)
			return;
	}

	if (dev->type == ARPHRD_ETHER) {
		if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
			return;
1165
		addr = dn_eth2dn(dev->dev_addr);
Linus Torvalds's avatar
Linus Torvalds committed
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
		maybe_default = 1;
	}

	if (addr == 0)
		return;

	if ((ifa = dn_dev_alloc_ifa()) == NULL)
		return;

	ifa->ifa_local = ifa->ifa_address = addr;
	ifa->ifa_flags = 0;
	ifa->ifa_scope = RT_SCOPE_UNIVERSE;
	strcpy(ifa->ifa_label, dev->name);

	dn_dev_set_ifa(dev, ifa);

	/*
	 * Automagically set the default device to the first automatically
	 * configured ethernet card in the system.
	 */
	if (maybe_default) {
		dev_hold(dev);
		if (dn_dev_set_default(dev, 0))
			dev_put(dev);
	}
}

static void dn_dev_delete(struct net_device *dev)
{
1195
	struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222

	if (dn_db == NULL)
		return;

	del_timer_sync(&dn_db->timer);
	dn_dev_sysctl_unregister(&dn_db->parms);
	dn_dev_check_default(dev);
	neigh_ifdown(&dn_neigh_table, dev);

	if (dn_db->parms.down)
		dn_db->parms.down(dev);

	dev->dn_ptr = NULL;

	neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
	neigh_ifdown(&dn_neigh_table, dev);

	if (dn_db->router)
		neigh_release(dn_db->router);
	if (dn_db->peer)
		neigh_release(dn_db->peer);

	kfree(dn_db);
}

void dn_dev_down(struct net_device *dev)
{
1223
	struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
1224 1225 1226 1227 1228
	struct dn_ifaddr *ifa;

	if (dn_db == NULL)
		return;

1229
	while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
		dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
		dn_dev_free_ifa(ifa);
	}

	dn_dev_delete(dev);
}

void dn_dev_init_pkt(struct sk_buff *skb)
{
}

void dn_dev_veri_pkt(struct sk_buff *skb)
{
}

void dn_dev_hello(struct sk_buff *skb)
{
}

void dn_dev_devices_off(void)
{
	struct net_device *dev;

	rtnl_lock();
1254
	for_each_netdev(&init_net, dev)
Linus Torvalds's avatar
Linus Torvalds committed
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
		dn_dev_down(dev);
	rtnl_unlock();

}

void dn_dev_devices_on(void)
{
	struct net_device *dev;

	rtnl_lock();
1265
	for_each_netdev(&init_net, dev) {
Linus Torvalds's avatar
Linus Torvalds committed
1266 1267 1268 1269 1270 1271 1272 1273
		if (dev->flags & IFF_UP)
			dn_dev_up(dev);
	}
	rtnl_unlock();
}

int register_dnaddr_notifier(struct notifier_block *nb)
{
1274
	return blocking_notifier_chain_register(&dnaddr_chain, nb);
Linus Torvalds's avatar
Linus Torvalds committed
1275 1276 1277 1278
}

int unregister_dnaddr_notifier(struct notifier_block *nb)
{
1279
	return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
Linus Torvalds's avatar
Linus Torvalds committed
1280 1281 1282
}

#ifdef CONFIG_PROC_FS
1283
static inline int is_dn_dev(struct net_device *dev)
Linus Torvalds's avatar
Linus Torvalds committed
1284
{
1285
	return dev->dn_ptr != NULL;
Linus Torvalds's avatar
Linus Torvalds committed
1286 1287
}

1288
static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1289
	__acquires(RCU)
Linus Torvalds's avatar
Linus Torvalds committed
1290
{
1291
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
1292 1293
	struct net_device *dev;

1294
	rcu_read_lock();
Linus Torvalds's avatar
Linus Torvalds committed
1295