rtnetlink.c 20.0 KB
Newer Older
L
Linus Torvalds 已提交
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 27 28 29 30 31 32 33 34 35 36
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Routing netlink socket interface: protocol independent part.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	Fixes:
 *	Vitaly E. Lavrov		RTA_OK arithmetics was wrong.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/security.h>
37
#include <linux/mutex.h>
L
Linus Torvalds 已提交
38 39 40 41 42 43 44 45 46 47 48 49 50 51

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/string.h>

#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/udp.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
52
#include <net/fib_rules.h>
53
#include <net/netlink.h>
54 55 56 57
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
#include <linux/wireless.h>
#include <net/iw_handler.h>
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
L
Linus Torvalds 已提交
58

59
static DEFINE_MUTEX(rtnl_mutex);
L
Linus Torvalds 已提交
60 61 62

void rtnl_lock(void)
{
63
	mutex_lock(&rtnl_mutex);
L
Linus Torvalds 已提交
64 65
}

66
void __rtnl_unlock(void)
L
Linus Torvalds 已提交
67
{
68
	mutex_unlock(&rtnl_mutex);
L
Linus Torvalds 已提交
69
}
70

L
Linus Torvalds 已提交
71 72
void rtnl_unlock(void)
{
73 74 75
	mutex_unlock(&rtnl_mutex);
	if (rtnl && rtnl->sk_receive_queue.qlen)
		rtnl->sk_data_ready(rtnl, 0);
L
Linus Torvalds 已提交
76 77 78
	netdev_run_todo();
}

79 80 81 82 83
int rtnl_trylock(void)
{
	return mutex_trylock(&rtnl_mutex);
}

L
Linus Torvalds 已提交
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
{
	memset(tb, 0, sizeof(struct rtattr*)*maxattr);

	while (RTA_OK(rta, len)) {
		unsigned flavor = rta->rta_type;
		if (flavor && flavor <= maxattr)
			tb[flavor-1] = rta;
		rta = RTA_NEXT(rta, len);
	}
	return 0;
}

struct sock *rtnl;

struct rtnetlink_link * rtnetlink_links[NPROTO];

101
static const int rtm_min[RTM_NR_FAMILIES] =
L
Linus Torvalds 已提交
102
{
103 104 105 106
	[RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
	[RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
	[RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
	[RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
107
	[RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
108 109 110 111 112 113 114
	[RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
	[RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
	[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
	[RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
115
	[RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
L
Linus Torvalds 已提交
116 117
};

118
static const int rta_max[RTM_NR_FAMILIES] =
L
Linus Torvalds 已提交
119
{
120 121 122 123
	[RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
	[RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
	[RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
	[RTM_FAM(RTM_NEWNEIGH)]     = NDA_MAX,
124
	[RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
125 126 127 128
	[RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
	[RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
	[RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
	[RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
129
	[RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
L
Linus Torvalds 已提交
130 131 132 133 134 135 136 137 138 139 140
};

void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
{
	struct rtattr *rta;
	int size = RTA_LENGTH(attrlen);

	rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
	rta->rta_type = attrtype;
	rta->rta_len = size;
	memcpy(RTA_DATA(rta), data, attrlen);
141
	memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
L
Linus Torvalds 已提交
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
}

size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
{
	size_t ret = RTA_PAYLOAD(rta);
	char *src = RTA_DATA(rta);

	if (ret > 0 && src[ret - 1] == '\0')
		ret--;
	if (size > 0) {
		size_t len = (ret >= size) ? size - 1 : ret;
		memset(dest, 0, size);
		memcpy(dest, src, len);
	}
	return ret;
}

int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
{
	int err = 0;

163
	NETLINK_CB(skb).dst_group = group;
L
Linus Torvalds 已提交
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
	if (echo)
		atomic_inc(&skb->users);
	netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
	if (echo)
		err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
	return err;
}

int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
{
	struct rtattr *mx = (struct rtattr*)skb->tail;
	int i;

	RTA_PUT(skb, RTA_METRICS, 0, NULL);
	for (i=0; i<RTAX_MAX; i++) {
		if (metrics[i])
			RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
	}
	mx->rta_len = skb->tail - (u8*)mx;
	if (mx->rta_len == RTA_LENGTH(0))
		skb_trim(skb, (u8*)mx - skb->data);
	return 0;

rtattr_failure:
	skb_trim(skb, (u8*)mx - skb->data);
	return -1;
}


S
Stefan Rompf 已提交
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
static void set_operstate(struct net_device *dev, unsigned char transition)
{
	unsigned char operstate = dev->operstate;

	switch(transition) {
	case IF_OPER_UP:
		if ((operstate == IF_OPER_DORMANT ||
		     operstate == IF_OPER_UNKNOWN) &&
		    !netif_dormant(dev))
			operstate = IF_OPER_UP;
		break;

	case IF_OPER_DORMANT:
		if (operstate == IF_OPER_UP ||
		    operstate == IF_OPER_UNKNOWN)
			operstate = IF_OPER_DORMANT;
		break;
	};

	if (dev->operstate != operstate) {
		write_lock_bh(&dev_base_lock);
		dev->operstate = operstate;
		write_unlock_bh(&dev_base_lock);
		netdev_state_change(dev);
	}
}

L
Linus Torvalds 已提交
220
static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
221 222
				 int type, u32 pid, u32 seq, u32 change, 
				 unsigned int flags)
L
Linus Torvalds 已提交
223 224 225 226 227
{
	struct ifinfomsg *r;
	struct nlmsghdr  *nlh;
	unsigned char	 *b = skb->tail;

228
	nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
L
Linus Torvalds 已提交
229 230
	r = NLMSG_DATA(nlh);
	r->ifi_family = AF_UNSPEC;
231
	r->__ifi_pad = 0;
L
Linus Torvalds 已提交
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
	r->ifi_type = dev->type;
	r->ifi_index = dev->ifindex;
	r->ifi_flags = dev_get_flags(dev);
	r->ifi_change = change;

	RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);

	if (1) {
		u32 txqlen = dev->tx_queue_len;
		RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
	}

	if (1) {
		u32 weight = dev->weight;
		RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
	}

S
Stefan Rompf 已提交
249 250 251 252 253 254 255
	if (1) {
		u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
		u8 link_mode = dev->link_mode;
		RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
		RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
	}

L
Linus Torvalds 已提交
256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
	if (1) {
		struct rtnl_link_ifmap map = {
			.mem_start   = dev->mem_start,
			.mem_end     = dev->mem_end,
			.base_addr   = dev->base_addr,
			.irq         = dev->irq,
			.dma         = dev->dma,
			.port        = dev->if_port,
		};
		RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
	}

	if (dev->addr_len) {
		RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
		RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
	}

	if (1) {
		u32 mtu = dev->mtu;
		RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
	}

	if (dev->ifindex != dev->iflink) {
		u32 iflink = dev->iflink;
		RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
	}

	if (dev->qdisc_sleeping)
		RTA_PUT(skb, IFLA_QDISC,
			strlen(dev->qdisc_sleeping->ops->id) + 1,
			dev->qdisc_sleeping->ops->id);
	
	if (dev->master) {
		u32 master = dev->master->ifindex;
		RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
	}

	if (dev->get_stats) {
		unsigned long *stats = (unsigned long*)dev->get_stats(dev);
		if (stats) {
			struct rtattr  *a;
			__u32	       *s;
			int		i;
			int		n = sizeof(struct rtnl_link_stats)/4;

			a = __RTA_PUT(skb, IFLA_STATS, n*4);
			s = RTA_DATA(a);
			for (i=0; i<n; i++)
				s[i] = stats[i];
		}
	}
	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
	int idx;
	int s_idx = cb->args[0];
	struct net_device *dev;

	read_lock(&dev_base_lock);
	for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
		if (idx < s_idx)
			continue;
326 327 328 329
		if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
					  NETLINK_CB(cb->skb).pid,
					  cb->nlh->nlmsg_seq, 0,
					  NLM_F_MULTI) <= 0)
L
Linus Torvalds 已提交
330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397
			break;
	}
	read_unlock(&dev_base_lock);
	cb->args[0] = idx;

	return skb->len;
}

static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
	struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
	struct rtattr    **ida = arg;
	struct net_device *dev;
	int err, send_addr_notify = 0;

	if (ifm->ifi_index >= 0)
		dev = dev_get_by_index(ifm->ifi_index);
	else if (ida[IFLA_IFNAME - 1]) {
		char ifname[IFNAMSIZ];

		if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
		                   IFNAMSIZ) >= IFNAMSIZ)
			return -EINVAL;
		dev = dev_get_by_name(ifname);
	} else
		return -EINVAL;

	if (!dev)
		return -ENODEV;

	err = -EINVAL;

	if (ifm->ifi_flags)
		dev_change_flags(dev, ifm->ifi_flags);

	if (ida[IFLA_MAP - 1]) {
		struct rtnl_link_ifmap *u_map;
		struct ifmap k_map;

		if (!dev->set_config) {
			err = -EOPNOTSUPP;
			goto out;
		}

		if (!netif_device_present(dev)) {
			err = -ENODEV;
			goto out;
		}
		
		if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
			goto out;

		u_map = RTA_DATA(ida[IFLA_MAP - 1]);

		k_map.mem_start = (unsigned long) u_map->mem_start;
		k_map.mem_end = (unsigned long) u_map->mem_end;
		k_map.base_addr = (unsigned short) u_map->base_addr;
		k_map.irq = (unsigned char) u_map->irq;
		k_map.dma = (unsigned char) u_map->dma;
		k_map.port = (unsigned char) u_map->port;

		err = dev->set_config(dev, &k_map);

		if (err)
			goto out;
	}

	if (ida[IFLA_ADDRESS - 1]) {
398 399 400
		struct sockaddr *sa;
		int len;

L
Linus Torvalds 已提交
401 402 403 404 405 406 407 408 409 410 411
		if (!dev->set_mac_address) {
			err = -EOPNOTSUPP;
			goto out;
		}
		if (!netif_device_present(dev)) {
			err = -ENODEV;
			goto out;
		}
		if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
			goto out;

412 413 414 415 416 417 418 419 420 421 422
		len = sizeof(sa_family_t) + dev->addr_len;
		sa = kmalloc(len, GFP_KERNEL);
		if (!sa) {
			err = -ENOMEM;
			goto out;
		}
		sa->sa_family = dev->type;
		memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
		       dev->addr_len);
		err = dev->set_mac_address(dev, sa);
		kfree(sa);
L
Linus Torvalds 已提交
423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459
		if (err)
			goto out;
		send_addr_notify = 1;
	}

	if (ida[IFLA_BROADCAST - 1]) {
		if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
			goto out;
		memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
		       dev->addr_len);
		send_addr_notify = 1;
	}

	if (ida[IFLA_MTU - 1]) {
		if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
			goto out;
		err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));

		if (err)
			goto out;

	}

	if (ida[IFLA_TXQLEN - 1]) {
		if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
			goto out;

		dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
	}

	if (ida[IFLA_WEIGHT - 1]) {
		if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
			goto out;

		dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
	}

S
Stefan Rompf 已提交
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475
	if (ida[IFLA_OPERSTATE - 1]) {
		if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
			goto out;

		set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
	}

	if (ida[IFLA_LINKMODE - 1]) {
		if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
			goto out;

		write_lock_bh(&dev_base_lock);
		dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
		write_unlock_bh(&dev_base_lock);
	}

L
Linus Torvalds 已提交
476 477 478 479 480 481 482 483 484 485 486
	if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
		char ifname[IFNAMSIZ];

		if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
		                   IFNAMSIZ) >= IFNAMSIZ)
			goto out;
		err = dev_change_name(dev, ifname);
		if (err)
			goto out;
	}

487 488 489 490 491 492 493 494 495 496 497
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
	if (ida[IFLA_WIRELESS - 1]) {

		/* Call Wireless Extensions.
		 * Various stuff checked in there... */
		err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
		if (err)
			goto out;
	}
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */

L
Linus Torvalds 已提交
498 499 500 501 502 503 504 505 506 507
	err = 0;

out:
	if (send_addr_notify)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);

	dev_put(dev);
	return err;
}

508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
{
	struct ifinfomsg  *ifm = NLMSG_DATA(in_nlh);
	struct rtattr    **ida = arg;
	struct net_device *dev;
	struct ifinfomsg *r;
	struct nlmsghdr  *nlh;
	int err = -ENOBUFS;
	struct sk_buff *skb;
	unsigned char	 *b;
	char *iw_buf = NULL;
	int iw_buf_len = 0;

	if (ifm->ifi_index >= 0)
		dev = dev_get_by_index(ifm->ifi_index);
	else
		return -EINVAL;
	if (!dev)
		return -ENODEV;

#ifdef CONFIG_NET_WIRELESS_RTNETLINK
	if (ida[IFLA_WIRELESS - 1]) {

		/* Call Wireless Extensions. We need to know the size before
		 * we can alloc. Various stuff checked in there... */
		err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
		if (err)
			goto out;
	}
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */

	/* Create a skb big enough to include all the data.
	 * Some requests are way bigger than 4k... Jean II */
	skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
			GFP_KERNEL);
	if (!skb)
		goto out;
	b = skb->tail;

	/* Put in the message the usual good stuff */
	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
			RTM_NEWLINK, sizeof(*r));
	r = NLMSG_DATA(nlh);
	r->ifi_family = AF_UNSPEC;
	r->__ifi_pad = 0;
	r->ifi_type = dev->type;
	r->ifi_index = dev->ifindex;
	r->ifi_flags = dev->flags;
	r->ifi_change = 0;

	/* Put the wireless payload if it exist */
	if(iw_buf != NULL)
		RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
			iw_buf + IW_EV_POINT_OFF);

	nlh->nlmsg_len = skb->tail - b;

	/* Needed ? */
	NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;

	err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
	if (err > 0)
		err = 0;
out:
	if(iw_buf != NULL)
		kfree(iw_buf);
	dev_put(dev);
	return err;

rtattr_failure:
nlmsg_failure:
	kfree_skb(skb);
	goto out;
}
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */

L
Linus Torvalds 已提交
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{
	int idx;
	int s_idx = cb->family;

	if (s_idx == 0)
		s_idx = 1;
	for (idx=1; idx<NPROTO; idx++) {
		int type = cb->nlh->nlmsg_type-RTM_BASE;
		if (idx < s_idx || idx == PF_PACKET)
			continue;
		if (rtnetlink_links[idx] == NULL ||
		    rtnetlink_links[idx][type].dumpit == NULL)
			continue;
		if (idx > s_idx)
			memset(&cb->args[0], 0, sizeof(cb->args));
		if (rtnetlink_links[idx][type].dumpit(skb, cb))
			break;
	}
	cb->family = idx;

	return skb->len;
}

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
	struct sk_buff *skb;
	int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
			       sizeof(struct rtnl_link_ifmap) +
			       sizeof(struct rtnl_link_stats) + 128);

	skb = alloc_skb(size, GFP_KERNEL);
	if (!skb)
		return;

620
	if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
L
Linus Torvalds 已提交
621 622 623
		kfree_skb(skb);
		return;
	}
624 625
	NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
	netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
L
Linus Torvalds 已提交
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
}

/* Protected by RTNL sempahore.  */
static struct rtattr **rta_buf;
static int rtattr_max;

/* Process one rtnetlink message. */

static __inline__ int
rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
{
	struct rtnetlink_link *link;
	struct rtnetlink_link *link_tab;
	int sz_idx, kind;
	int min_len;
	int family;
	int type;
	int err;

	/* Only requests are handled by kernel now */
	if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
		return 0;

	type = nlh->nlmsg_type;

	/* A control message: ignore them */
	if (type < RTM_BASE)
		return 0;

	/* Unknown message: reply with EINVAL */
	if (type > RTM_MAX)
		goto err_inval;

	type -= RTM_BASE;

	/* All the messages must have at least 1 byte length */
	if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
		return 0;

	family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
	if (family >= NPROTO) {
		*errp = -EAFNOSUPPORT;
		return -1;
	}

	link_tab = rtnetlink_links[family];
	if (link_tab == NULL)
		link_tab = rtnetlink_links[PF_UNSPEC];
	link = &link_tab[type];

	sz_idx = type>>2;
	kind = type&3;

679
	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
L
Linus Torvalds 已提交
680 681 682 683 684 685 686 687 688 689 690 691
		*errp = -EPERM;
		return -1;
	}

	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
		if (link->dumpit == NULL)
			link = &(rtnetlink_links[PF_UNSPEC][type]);

		if (link->dumpit == NULL)
			goto err_inval;

		if ((*errp = netlink_dump_start(rtnl, skb, nlh,
692
						link->dumpit, NULL)) != 0) {
L
Linus Torvalds 已提交
693 694
			return -1;
		}
695 696

		netlink_queue_skip(nlh, skb);
L
Linus Torvalds 已提交
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
		return -1;
	}

	memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));

	min_len = rtm_min[sz_idx];
	if (nlh->nlmsg_len < min_len)
		goto err_inval;

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
		struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);

		while (RTA_OK(attr, attrlen)) {
			unsigned flavor = attr->rta_type;
			if (flavor) {
				if (flavor > rta_max[sz_idx])
					goto err_inval;
				rta_buf[flavor-1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

	if (link->doit == NULL)
		link = &(rtnetlink_links[PF_UNSPEC][type]);
	if (link->doit == NULL)
		goto err_inval;
	err = link->doit(skb, nlh, (void *)&rta_buf[0]);

	*errp = err;
	return err;

err_inval:
	*errp = -EINVAL;
	return -1;
}

static void rtnetlink_rcv(struct sock *sk, int len)
{
737
	unsigned int qlen = 0;
738

L
Linus Torvalds 已提交
739
	do {
740
		mutex_lock(&rtnl_mutex);
741
		netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
742
		mutex_unlock(&rtnl_mutex);
L
Linus Torvalds 已提交
743 744

		netdev_run_todo();
745
	} while (qlen);
L
Linus Torvalds 已提交
746 747
}

748
static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
L
Linus Torvalds 已提交
749
{
750 751 752 753 754
	[RTM_GETLINK     - RTM_BASE] = {
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
					 .doit   = do_getlink,
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
					 .dumpit = rtnetlink_dump_ifinfo },
755 756 757 758 759 760
	[RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink		 },
	[RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all	 },
	[RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all	 },
	[RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add		 },
	[RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete		 },
	[RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info	 },
761 762 763 764
#ifdef CONFIG_FIB_RULES
	[RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule	 },
	[RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule	 },
#endif
765 766 767
	[RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all	 },
	[RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info	 },
	[RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set		 },
L
Linus Torvalds 已提交
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
};

static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
	switch (event) {
	case NETDEV_UNREGISTER:
		rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
		break;
	case NETDEV_REGISTER:
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
		break;
	case NETDEV_UP:
	case NETDEV_DOWN:
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
		break;
	case NETDEV_CHANGE:
	case NETDEV_GOING_DOWN:
		break;
	default:
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block rtnetlink_dev_notifier = {
	.notifier_call	= rtnetlink_event,
};

void __init rtnetlink_init(void)
{
	int i;

	rtattr_max = 0;
	for (i = 0; i < ARRAY_SIZE(rta_max); i++)
		if (rta_max[i] > rtattr_max)
			rtattr_max = rta_max[i];
	rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
	if (!rta_buf)
		panic("rtnetlink_init: cannot allocate rta_buf\n");

810 811
	rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
	                             THIS_MODULE);
L
Linus Torvalds 已提交
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
	if (rtnl == NULL)
		panic("rtnetlink_init: cannot initialize rtnetlink\n");
	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
	register_netdevice_notifier(&rtnetlink_dev_notifier);
	rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
	rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
}

EXPORT_SYMBOL(__rta_fill);
EXPORT_SYMBOL(rtattr_strlcpy);
EXPORT_SYMBOL(rtattr_parse);
EXPORT_SYMBOL(rtnetlink_links);
EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl);
EXPORT_SYMBOL(rtnl_lock);
827
EXPORT_SYMBOL(rtnl_trylock);
L
Linus Torvalds 已提交
828
EXPORT_SYMBOL(rtnl_unlock);