ipmr.c 42.7 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
/*
 *	IP multicast routing support for mrouted 3.6/3.8
 *
 *		(c) 1995 Alan Cox, <alan@redhat.com>
 *	  Linux Consultancy and Custom Driver Development
 *
 *	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.
 *
 *	Version: $Id: ipmr.c,v 1.65 2001/10/31 21:55:54 davem Exp $
 *
 *	Fixes:
 *	Michael Chastain	:	Incorrect size of copying.
 *	Alan Cox		:	Added the cache manager code
 *	Alan Cox		:	Fixed the clone/copy bug and device race.
 *	Mike McLagan		:	Routing by source
 *	Malcolm Beattie		:	Buffer handling fixes.
 *	Alexey Kuznetsov	:	Double buffer free and other fixes.
 *	SVR Anand		:	Fixed several multicast bugs and problems.
 *	Alexey Kuznetsov	:	Status, optimisations and more.
 *	Brad Parker		:	Better behaviour on mrouted upcall
 *					overflow.
 *      Carlos Picoto           :       PIMv1 Support
 *	Pavlin Ivanov Radoslavov:	PIMv2 Registers must checksum only PIM header
 *					Relax this requrement to work with older peers.
 *
 */

#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/types.h>
34
#include <linux/capability.h>
L
Linus Torvalds 已提交
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/mroute.h>
#include <linux/init.h>
51
#include <linux/if_ether.h>
L
Linus Torvalds 已提交
52 53 54
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
55
#include <net/route.h>
L
Linus Torvalds 已提交
56 57 58 59 60 61 62 63 64
#include <net/sock.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/raw.h>
#include <linux/notifier.h>
#include <linux/if_arp.h>
#include <linux/netfilter_ipv4.h>
#include <net/ipip.h>
#include <net/checksum.h>
65
#include <net/netlink.h>
L
Linus Torvalds 已提交
66 67 68 69 70 71 72 73 74 75 76 77 78 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

#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
#define CONFIG_IP_PIMSM	1
#endif

static struct sock *mroute_socket;


/* Big lock, protecting vif table, mrt cache and mroute socket state.
   Note that the changes are semaphored via rtnl_lock.
 */

static DEFINE_RWLOCK(mrt_lock);

/*
 *	Multicast router control variables
 */

static struct vif_device vif_table[MAXVIFS];		/* Devices 		*/
static int maxvif;

#define VIF_EXISTS(idx) (vif_table[idx].dev != NULL)

static int mroute_do_assert;				/* Set in PIM assert	*/
static int mroute_do_pim;

static struct mfc_cache *mfc_cache_array[MFC_LINES];	/* Forwarding cache	*/

static struct mfc_cache *mfc_unres_queue;		/* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len;		/* Size of unresolved	*/

/* Special spinlock for queue of unresolved entries */
static DEFINE_SPINLOCK(mfc_unres_lock);

/* We return to original Alan's scheme. Hash table of resolved
   entries is changed only in process context and protected
   with weak lock mrt_lock. Queue of unresolved entries is protected
   with strong spinlock mfc_unres_lock.

   In this case data path is free of exclusive locks at all.
 */

108
static struct kmem_cache *mrt_cachep __read_mostly;
L
Linus Torvalds 已提交
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153

static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local);
static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert);
static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm);

#ifdef CONFIG_IP_PIMSM_V2
static struct net_protocol pim_protocol;
#endif

static struct timer_list ipmr_expire_timer;

/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */

static
struct net_device *ipmr_new_tunnel(struct vifctl *v)
{
	struct net_device  *dev;

	dev = __dev_get_by_name("tunl0");

	if (dev) {
		int err;
		struct ifreq ifr;
		mm_segment_t	oldfs;
		struct ip_tunnel_parm p;
		struct in_device  *in_dev;

		memset(&p, 0, sizeof(p));
		p.iph.daddr = v->vifc_rmt_addr.s_addr;
		p.iph.saddr = v->vifc_lcl_addr.s_addr;
		p.iph.version = 4;
		p.iph.ihl = 5;
		p.iph.protocol = IPPROTO_IPIP;
		sprintf(p.name, "dvmrp%d", v->vifc_vifi);
		ifr.ifr_ifru.ifru_data = (void*)&p;

		oldfs = get_fs(); set_fs(KERNEL_DS);
		err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
		set_fs(oldfs);

		dev = NULL;

		if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) {
			dev->flags |= IFF_MULTICAST;

154
			in_dev = __in_dev_get_rtnl(dev);
155
			if (in_dev == NULL)
L
Linus Torvalds 已提交
156
				goto failure;
157 158 159

			ipv4_devconf_setall(in_dev);
			IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
L
Linus Torvalds 已提交
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182

			if (dev_open(dev))
				goto failure;
		}
	}
	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

#ifdef CONFIG_IP_PIMSM

static int reg_vif_num = -1;

static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
{
	read_lock(&mrt_lock);
183 184
	((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len;
	((struct net_device_stats*)netdev_priv(dev))->tx_packets++;
L
Linus Torvalds 已提交
185 186 187 188 189 190 191 192
	ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT);
	read_unlock(&mrt_lock);
	kfree_skb(skb);
	return 0;
}

static struct net_device_stats *reg_vif_get_stats(struct net_device *dev)
{
193
	return (struct net_device_stats*)netdev_priv(dev);
L
Linus Torvalds 已提交
194 195 196 197 198
}

static void reg_vif_setup(struct net_device *dev)
{
	dev->type		= ARPHRD_PIMREG;
199
	dev->mtu		= ETH_DATA_LEN - sizeof(struct iphdr) - 8;
L
Linus Torvalds 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
	dev->flags		= IFF_NOARP;
	dev->hard_start_xmit	= reg_vif_xmit;
	dev->get_stats		= reg_vif_get_stats;
	dev->destructor		= free_netdev;
}

static struct net_device *ipmr_reg_vif(void)
{
	struct net_device *dev;
	struct in_device *in_dev;

	dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg",
			   reg_vif_setup);

	if (dev == NULL)
		return NULL;

	if (register_netdevice(dev)) {
		free_netdev(dev);
		return NULL;
	}
	dev->iflink = 0;

223 224 225
	rcu_read_lock();
	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
		rcu_read_unlock();
L
Linus Torvalds 已提交
226
		goto failure;
227
	}
L
Linus Torvalds 已提交
228

229 230 231
	ipv4_devconf_setall(in_dev);
	IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
	rcu_read_unlock();
L
Linus Torvalds 已提交
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250

	if (dev_open(dev))
		goto failure;

	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}
#endif

/*
 *	Delete a VIF entry
 */
251

L
Linus Torvalds 已提交
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
static int vif_delete(int vifi)
{
	struct vif_device *v;
	struct net_device *dev;
	struct in_device *in_dev;

	if (vifi < 0 || vifi >= maxvif)
		return -EADDRNOTAVAIL;

	v = &vif_table[vifi];

	write_lock_bh(&mrt_lock);
	dev = v->dev;
	v->dev = NULL;

	if (!dev) {
		write_unlock_bh(&mrt_lock);
		return -EADDRNOTAVAIL;
	}

#ifdef CONFIG_IP_PIMSM
	if (vifi == reg_vif_num)
		reg_vif_num = -1;
#endif

	if (vifi+1 == maxvif) {
		int tmp;
		for (tmp=vifi-1; tmp>=0; tmp--) {
			if (VIF_EXISTS(tmp))
				break;
		}
		maxvif = tmp+1;
	}

	write_unlock_bh(&mrt_lock);

	dev_set_allmulti(dev, -1);

290
	if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
291
		IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
L
Linus Torvalds 已提交
292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
		ip_rt_multicast_event(in_dev);
	}

	if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER))
		unregister_netdevice(dev);

	dev_put(dev);
	return 0;
}

/* Destroy an unresolved cache entry, killing queued skbs
   and reporting error to netlink readers.
 */

static void ipmr_destroy_unres(struct mfc_cache *c)
{
	struct sk_buff *skb;
309
	struct nlmsgerr *e;
L
Linus Torvalds 已提交
310 311 312

	atomic_dec(&cache_resolve_queue_len);

S
Stephen Hemminger 已提交
313
	while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) {
314
		if (ip_hdr(skb)->version == 0) {
L
Linus Torvalds 已提交
315 316 317 318
			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
			nlh->nlmsg_type = NLMSG_ERROR;
			nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
			skb_trim(skb, nlh->nlmsg_len);
319 320 321
			e = NLMSG_DATA(nlh);
			e->error = -ETIMEDOUT;
			memset(&e->msg, 0, sizeof(e->msg));
322 323

			rtnl_unicast(skb, NETLINK_CB(skb).pid);
L
Linus Torvalds 已提交
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
		} else
			kfree_skb(skb);
	}

	kmem_cache_free(mrt_cachep, c);
}


/* Single timer process for all the unresolved queue. */

static void ipmr_expire_process(unsigned long dummy)
{
	unsigned long now;
	unsigned long expires;
	struct mfc_cache *c, **cp;

	if (!spin_trylock(&mfc_unres_lock)) {
		mod_timer(&ipmr_expire_timer, jiffies+HZ/10);
		return;
	}

	if (atomic_read(&cache_resolve_queue_len) == 0)
		goto out;

	now = jiffies;
	expires = 10*HZ;
	cp = &mfc_unres_queue;

	while ((c=*cp) != NULL) {
		if (time_after(c->mfc_un.unres.expires, now)) {
			unsigned long interval = c->mfc_un.unres.expires - now;
			if (interval < expires)
				expires = interval;
			cp = &c->next;
			continue;
		}

		*cp = c->next;

		ipmr_destroy_unres(c);
	}

	if (atomic_read(&cache_resolve_queue_len))
		mod_timer(&ipmr_expire_timer, jiffies + expires);

out:
	spin_unlock(&mfc_unres_lock);
}

/* Fill oifs list. It is called under write locked mrt_lock. */

375
static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls)
L
Linus Torvalds 已提交
376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418
{
	int vifi;

	cache->mfc_un.res.minvif = MAXVIFS;
	cache->mfc_un.res.maxvif = 0;
	memset(cache->mfc_un.res.ttls, 255, MAXVIFS);

	for (vifi=0; vifi<maxvif; vifi++) {
		if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) {
			cache->mfc_un.res.ttls[vifi] = ttls[vifi];
			if (cache->mfc_un.res.minvif > vifi)
				cache->mfc_un.res.minvif = vifi;
			if (cache->mfc_un.res.maxvif <= vifi)
				cache->mfc_un.res.maxvif = vifi + 1;
		}
	}
}

static int vif_add(struct vifctl *vifc, int mrtsock)
{
	int vifi = vifc->vifc_vifi;
	struct vif_device *v = &vif_table[vifi];
	struct net_device *dev;
	struct in_device *in_dev;

	/* Is vif busy ? */
	if (VIF_EXISTS(vifi))
		return -EADDRINUSE;

	switch (vifc->vifc_flags) {
#ifdef CONFIG_IP_PIMSM
	case VIFF_REGISTER:
		/*
		 * Special Purpose VIF in PIM
		 * All the packets will be sent to the daemon
		 */
		if (reg_vif_num >= 0)
			return -EADDRINUSE;
		dev = ipmr_reg_vif();
		if (!dev)
			return -ENOBUFS;
		break;
#endif
419
	case VIFF_TUNNEL:
L
Linus Torvalds 已提交
420 421 422 423 424
		dev = ipmr_new_tunnel(vifc);
		if (!dev)
			return -ENOBUFS;
		break;
	case 0:
425
		dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr);
L
Linus Torvalds 已提交
426 427
		if (!dev)
			return -EADDRNOTAVAIL;
428
		dev_put(dev);
L
Linus Torvalds 已提交
429 430 431 432 433
		break;
	default:
		return -EINVAL;
	}

434
	if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
L
Linus Torvalds 已提交
435
		return -EADDRNOTAVAIL;
436
	IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
L
Linus Torvalds 已提交
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471
	dev_set_allmulti(dev, +1);
	ip_rt_multicast_event(in_dev);

	/*
	 *	Fill in the VIF structures
	 */
	v->rate_limit=vifc->vifc_rate_limit;
	v->local=vifc->vifc_lcl_addr.s_addr;
	v->remote=vifc->vifc_rmt_addr.s_addr;
	v->flags=vifc->vifc_flags;
	if (!mrtsock)
		v->flags |= VIFF_STATIC;
	v->threshold=vifc->vifc_threshold;
	v->bytes_in = 0;
	v->bytes_out = 0;
	v->pkt_in = 0;
	v->pkt_out = 0;
	v->link = dev->ifindex;
	if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER))
		v->link = dev->iflink;

	/* And finish update writing critical data */
	write_lock_bh(&mrt_lock);
	dev_hold(dev);
	v->dev=dev;
#ifdef CONFIG_IP_PIMSM
	if (v->flags&VIFF_REGISTER)
		reg_vif_num = vifi;
#endif
	if (vifi+1 > maxvif)
		maxvif = vifi+1;
	write_unlock_bh(&mrt_lock);
	return 0;
}

A
Al Viro 已提交
472
static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp)
L
Linus Torvalds 已提交
473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488
{
	int line=MFC_HASH(mcastgrp,origin);
	struct mfc_cache *c;

	for (c=mfc_cache_array[line]; c; c = c->next) {
		if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp)
			break;
	}
	return c;
}

/*
 *	Allocate a multicast cache entry
 */
static struct mfc_cache *ipmr_cache_alloc(void)
{
489
	struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
S
Stephen Hemminger 已提交
490
	if (c==NULL)
L
Linus Torvalds 已提交
491 492 493 494 495 496 497
		return NULL;
	c->mfc_un.res.minvif = MAXVIFS;
	return c;
}

static struct mfc_cache *ipmr_cache_alloc_unres(void)
{
498
	struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
S
Stephen Hemminger 已提交
499
	if (c==NULL)
L
Linus Torvalds 已提交
500 501 502 503 504 505 506 507 508
		return NULL;
	skb_queue_head_init(&c->mfc_un.unres.unresolved);
	c->mfc_un.unres.expires = jiffies + 10*HZ;
	return c;
}

/*
 *	A cache entry has gone into a resolved state from queued
 */
509

L
Linus Torvalds 已提交
510 511 512
static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c)
{
	struct sk_buff *skb;
513
	struct nlmsgerr *e;
L
Linus Torvalds 已提交
514 515 516 517 518

	/*
	 *	Play the pending entries through our router
	 */

S
Stephen Hemminger 已提交
519
	while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) {
520
		if (ip_hdr(skb)->version == 0) {
L
Linus Torvalds 已提交
521 522 523
			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));

			if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) {
524 525
				nlh->nlmsg_len = (skb_tail_pointer(skb) -
						  (u8 *)nlh);
L
Linus Torvalds 已提交
526 527 528 529
			} else {
				nlh->nlmsg_type = NLMSG_ERROR;
				nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
				skb_trim(skb, nlh->nlmsg_len);
530 531 532
				e = NLMSG_DATA(nlh);
				e->error = -EMSGSIZE;
				memset(&e->msg, 0, sizeof(e->msg));
L
Linus Torvalds 已提交
533
			}
534 535

			rtnl_unicast(skb, NETLINK_CB(skb).pid);
L
Linus Torvalds 已提交
536 537 538 539 540 541 542 543 544 545 546
		} else
			ip_mr_forward(skb, c, 0);
	}
}

/*
 *	Bounce a cache query up to mrouted. We could use netlink for this but mrouted
 *	expects the following bizarre scheme.
 *
 *	Called under mrt_lock.
 */
547

L
Linus Torvalds 已提交
548 549 550
static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
{
	struct sk_buff *skb;
551
	const int ihl = ip_hdrlen(pkt);
L
Linus Torvalds 已提交
552 553 554 555 556 557 558 559 560 561 562
	struct igmphdr *igmp;
	struct igmpmsg *msg;
	int ret;

#ifdef CONFIG_IP_PIMSM
	if (assert == IGMPMSG_WHOLEPKT)
		skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
	else
#endif
		skb = alloc_skb(128, GFP_ATOMIC);

S
Stephen Hemminger 已提交
563
	if (!skb)
L
Linus Torvalds 已提交
564 565 566 567 568 569 570 571 572
		return -ENOBUFS;

#ifdef CONFIG_IP_PIMSM
	if (assert == IGMPMSG_WHOLEPKT) {
		/* Ugly, but we have no choice with this interface.
		   Duplicate old header, fix ihl, length etc.
		   And all this only to mangle msg->im_msgtype and
		   to set msg->im_mbz to "mbz" :-)
		 */
573 574
		skb_push(skb, sizeof(struct iphdr));
		skb_reset_network_header(skb);
575
		skb_reset_transport_header(skb);
576
		msg = (struct igmpmsg *)skb_network_header(skb);
577
		memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
L
Linus Torvalds 已提交
578 579
		msg->im_msgtype = IGMPMSG_WHOLEPKT;
		msg->im_mbz = 0;
580
		msg->im_vif = reg_vif_num;
581 582 583
		ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
		ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
					     sizeof(struct iphdr));
584
	} else
L
Linus Torvalds 已提交
585
#endif
586 587
	{

L
Linus Torvalds 已提交
588 589 590 591
	/*
	 *	Copy the IP header
	 */

592
	skb->network_header = skb->tail;
593
	skb_put(skb, ihl);
594
	skb_copy_to_linear_data(skb, pkt->data, ihl);
595 596
	ip_hdr(skb)->protocol = 0;			/* Flag to the kernel this is a route add */
	msg = (struct igmpmsg *)skb_network_header(skb);
L
Linus Torvalds 已提交
597 598 599 600 601 602 603 604 605 606 607
	msg->im_vif = vifi;
	skb->dst = dst_clone(pkt->dst);

	/*
	 *	Add our header
	 */

	igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr));
	igmp->type	=
	msg->im_msgtype = assert;
	igmp->code 	=	0;
608
	ip_hdr(skb)->tot_len = htons(skb->len);			/* Fix the length */
609
	skb->transport_header = skb->network_header;
610
	}
L
Linus Torvalds 已提交
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631

	if (mroute_socket == NULL) {
		kfree_skb(skb);
		return -EINVAL;
	}

	/*
	 *	Deliver to mrouted
	 */
	if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) {
		if (net_ratelimit())
			printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n");
		kfree_skb(skb);
	}

	return ret;
}

/*
 *	Queue a packet for resolution. It gets locked cache entry!
 */
632

L
Linus Torvalds 已提交
633 634 635 636 637
static int
ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
{
	int err;
	struct mfc_cache *c;
638
	const struct iphdr *iph = ip_hdr(skb);
L
Linus Torvalds 已提交
639 640 641

	spin_lock_bh(&mfc_unres_lock);
	for (c=mfc_unres_queue; c; c=c->next) {
642 643
		if (c->mfc_mcastgrp == iph->daddr &&
		    c->mfc_origin == iph->saddr)
L
Linus Torvalds 已提交
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
			break;
	}

	if (c == NULL) {
		/*
		 *	Create a new entry if allowable
		 */

		if (atomic_read(&cache_resolve_queue_len)>=10 ||
		    (c=ipmr_cache_alloc_unres())==NULL) {
			spin_unlock_bh(&mfc_unres_lock);

			kfree_skb(skb);
			return -ENOBUFS;
		}

		/*
		 *	Fill in the new cache entry
		 */
663 664 665
		c->mfc_parent	= -1;
		c->mfc_origin	= iph->saddr;
		c->mfc_mcastgrp	= iph->daddr;
L
Linus Torvalds 已提交
666 667 668 669 670

		/*
		 *	Reflect first query at mrouted.
		 */
		if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) {
671
			/* If the report failed throw the cache entry
L
Linus Torvalds 已提交
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
			   out - Brad Parker
			 */
			spin_unlock_bh(&mfc_unres_lock);

			kmem_cache_free(mrt_cachep, c);
			kfree_skb(skb);
			return err;
		}

		atomic_inc(&cache_resolve_queue_len);
		c->next = mfc_unres_queue;
		mfc_unres_queue = c;

		mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires);
	}

	/*
	 *	See if we can append the packet
	 */
	if (c->mfc_un.unres.unresolved.qlen>3) {
		kfree_skb(skb);
		err = -ENOBUFS;
	} else {
		skb_queue_tail(&c->mfc_un.unres.unresolved,skb);
		err = 0;
	}

	spin_unlock_bh(&mfc_unres_lock);
	return err;
}

/*
 *	MFC cache manipulation by user space mroute daemon
 */

static int ipmr_mfc_delete(struct mfcctl *mfc)
{
	int line;
	struct mfc_cache *c, **cp;

	line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);

	for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) {
		if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
			write_lock_bh(&mrt_lock);
			*cp = c->next;
			write_unlock_bh(&mrt_lock);

			kmem_cache_free(mrt_cachep, c);
			return 0;
		}
	}
	return -ENOENT;
}

static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
{
	int line;
	struct mfc_cache *uc, *c, **cp;

	line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);

	for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) {
		if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr)
			break;
	}

	if (c != NULL) {
		write_lock_bh(&mrt_lock);
		c->mfc_parent = mfc->mfcc_parent;
744
		ipmr_update_thresholds(c, mfc->mfcc_ttls);
L
Linus Torvalds 已提交
745 746 747 748 749 750
		if (!mrtsock)
			c->mfc_flags |= MFC_STATIC;
		write_unlock_bh(&mrt_lock);
		return 0;
	}

S
Stephen Hemminger 已提交
751
	if (!MULTICAST(mfc->mfcc_mcastgrp.s_addr))
L
Linus Torvalds 已提交
752 753 754 755 756 757 758 759 760
		return -EINVAL;

	c=ipmr_cache_alloc();
	if (c==NULL)
		return -ENOMEM;

	c->mfc_origin=mfc->mfcc_origin.s_addr;
	c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr;
	c->mfc_parent=mfc->mfcc_parent;
761
	ipmr_update_thresholds(c, mfc->mfcc_ttls);
L
Linus Torvalds 已提交
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
	if (!mrtsock)
		c->mfc_flags |= MFC_STATIC;

	write_lock_bh(&mrt_lock);
	c->next = mfc_cache_array[line];
	mfc_cache_array[line] = c;
	write_unlock_bh(&mrt_lock);

	/*
	 *	Check to see if we resolved a queued list. If so we
	 *	need to send on the frames and tidy up.
	 */
	spin_lock_bh(&mfc_unres_lock);
	for (cp = &mfc_unres_queue; (uc=*cp) != NULL;
	     cp = &uc->next) {
		if (uc->mfc_origin == c->mfc_origin &&
		    uc->mfc_mcastgrp == c->mfc_mcastgrp) {
			*cp = uc->next;
			if (atomic_dec_and_test(&cache_resolve_queue_len))
				del_timer(&ipmr_expire_timer);
			break;
		}
	}
	spin_unlock_bh(&mfc_unres_lock);

	if (uc) {
		ipmr_cache_resolve(uc, c);
		kmem_cache_free(mrt_cachep, uc);
	}
	return 0;
}

/*
 *	Close the multicast socket, and clear the vif tables etc
 */
797

L
Linus Torvalds 已提交
798 799 800
static void mroute_clean_tables(struct sock *sk)
{
	int i;
801

L
Linus Torvalds 已提交
802 803 804
	/*
	 *	Shut down all active vif entries
	 */
S
Stephen Hemminger 已提交
805
	for (i=0; i<maxvif; i++) {
L
Linus Torvalds 已提交
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
		if (!(vif_table[i].flags&VIFF_STATIC))
			vif_delete(i);
	}

	/*
	 *	Wipe the cache
	 */
	for (i=0;i<MFC_LINES;i++) {
		struct mfc_cache *c, **cp;

		cp = &mfc_cache_array[i];
		while ((c = *cp) != NULL) {
			if (c->mfc_flags&MFC_STATIC) {
				cp = &c->next;
				continue;
			}
			write_lock_bh(&mrt_lock);
			*cp = c->next;
			write_unlock_bh(&mrt_lock);

			kmem_cache_free(mrt_cachep, c);
		}
	}

	if (atomic_read(&cache_resolve_queue_len) != 0) {
		struct mfc_cache *c;

		spin_lock_bh(&mfc_unres_lock);
		while (mfc_unres_queue != NULL) {
			c = mfc_unres_queue;
			mfc_unres_queue = c->next;
			spin_unlock_bh(&mfc_unres_lock);

			ipmr_destroy_unres(c);

			spin_lock_bh(&mfc_unres_lock);
		}
		spin_unlock_bh(&mfc_unres_lock);
	}
}

static void mrtsock_destruct(struct sock *sk)
{
	rtnl_lock();
	if (sk == mroute_socket) {
851
		IPV4_DEVCONF_ALL(MC_FORWARDING)--;
L
Linus Torvalds 已提交
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867

		write_lock_bh(&mrt_lock);
		mroute_socket=NULL;
		write_unlock_bh(&mrt_lock);

		mroute_clean_tables(sk);
	}
	rtnl_unlock();
}

/*
 *	Socket options and virtual interface manipulation. The whole
 *	virtual interface system is a complete heap, but unfortunately
 *	that's how BSD mrouted happens to think. Maybe one day with a proper
 *	MOSPF/PIM router set up we can clean this up.
 */
868

L
Linus Torvalds 已提交
869 870 871 872 873
int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen)
{
	int ret;
	struct vifctl vif;
	struct mfcctl mfc;
874

S
Stephen Hemminger 已提交
875 876
	if (optname != MRT_INIT) {
		if (sk != mroute_socket && !capable(CAP_NET_ADMIN))
L
Linus Torvalds 已提交
877 878 879
			return -EACCES;
	}

S
Stephen Hemminger 已提交
880 881 882 883 884 885 886
	switch (optname) {
	case MRT_INIT:
		if (sk->sk_type != SOCK_RAW ||
		    inet_sk(sk)->num != IPPROTO_IGMP)
			return -EOPNOTSUPP;
		if (optlen!=sizeof(int))
			return -ENOPROTOOPT;
L
Linus Torvalds 已提交
887

S
Stephen Hemminger 已提交
888 889
		rtnl_lock();
		if (mroute_socket) {
L
Linus Torvalds 已提交
890
			rtnl_unlock();
S
Stephen Hemminger 已提交
891 892 893 894 895 896 897 898 899
			return -EADDRINUSE;
		}

		ret = ip_ra_control(sk, 1, mrtsock_destruct);
		if (ret == 0) {
			write_lock_bh(&mrt_lock);
			mroute_socket=sk;
			write_unlock_bh(&mrt_lock);

900
			IPV4_DEVCONF_ALL(MC_FORWARDING)++;
S
Stephen Hemminger 已提交
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
		}
		rtnl_unlock();
		return ret;
	case MRT_DONE:
		if (sk!=mroute_socket)
			return -EACCES;
		return ip_ra_control(sk, 0, NULL);
	case MRT_ADD_VIF:
	case MRT_DEL_VIF:
		if (optlen!=sizeof(vif))
			return -EINVAL;
		if (copy_from_user(&vif,optval,sizeof(vif)))
			return -EFAULT;
		if (vif.vifc_vifi >= MAXVIFS)
			return -ENFILE;
		rtnl_lock();
		if (optname==MRT_ADD_VIF) {
			ret = vif_add(&vif, sk==mroute_socket);
		} else {
			ret = vif_delete(vif.vifc_vifi);
		}
		rtnl_unlock();
		return ret;
L
Linus Torvalds 已提交
924 925 926 927 928

		/*
		 *	Manipulate the forwarding caches. These live
		 *	in a sort of kernel/user symbiosis.
		 */
S
Stephen Hemminger 已提交
929 930 931 932 933 934 935 936 937 938 939 940 941
	case MRT_ADD_MFC:
	case MRT_DEL_MFC:
		if (optlen!=sizeof(mfc))
			return -EINVAL;
		if (copy_from_user(&mfc,optval, sizeof(mfc)))
			return -EFAULT;
		rtnl_lock();
		if (optname==MRT_DEL_MFC)
			ret = ipmr_mfc_delete(&mfc);
		else
			ret = ipmr_mfc_add(&mfc, sk==mroute_socket);
		rtnl_unlock();
		return ret;
L
Linus Torvalds 已提交
942 943 944
		/*
		 *	Control PIM assert.
		 */
S
Stephen Hemminger 已提交
945 946 947 948 949 950 951 952
	case MRT_ASSERT:
	{
		int v;
		if (get_user(v,(int __user *)optval))
			return -EFAULT;
		mroute_do_assert=(v)?1:0;
		return 0;
	}
L
Linus Torvalds 已提交
953
#ifdef CONFIG_IP_PIMSM
S
Stephen Hemminger 已提交
954 955 956 957 958 959 960 961 962 963 964
	case MRT_PIM:
	{
		int v, ret;
		if (get_user(v,(int __user *)optval))
			return -EFAULT;
		v = (v)?1:0;
		rtnl_lock();
		ret = 0;
		if (v != mroute_do_pim) {
			mroute_do_pim = v;
			mroute_do_assert = v;
L
Linus Torvalds 已提交
965
#ifdef CONFIG_IP_PIMSM_V2
S
Stephen Hemminger 已提交
966 967 968 969 970 971 972 973
			if (mroute_do_pim)
				ret = inet_add_protocol(&pim_protocol,
							IPPROTO_PIM);
			else
				ret = inet_del_protocol(&pim_protocol,
							IPPROTO_PIM);
			if (ret < 0)
				ret = -EAGAIN;
L
Linus Torvalds 已提交
974 975
#endif
		}
S
Stephen Hemminger 已提交
976 977 978
		rtnl_unlock();
		return ret;
	}
L
Linus Torvalds 已提交
979
#endif
S
Stephen Hemminger 已提交
980 981 982 983 984 985
	/*
	 *	Spurious command, or MRT_VERSION which you cannot
	 *	set.
	 */
	default:
		return -ENOPROTOOPT;
L
Linus Torvalds 已提交
986 987 988 989 990 991
	}
}

/*
 *	Getsock opt support for the multicast routing system.
 */
992

L
Linus Torvalds 已提交
993 994 995 996 997
int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen)
{
	int olr;
	int val;

S
Stephen Hemminger 已提交
998
	if (optname!=MRT_VERSION &&
L
Linus Torvalds 已提交
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
#ifdef CONFIG_IP_PIMSM
	   optname!=MRT_PIM &&
#endif
	   optname!=MRT_ASSERT)
		return -ENOPROTOOPT;

	if (get_user(olr, optlen))
		return -EFAULT;

	olr = min_t(unsigned int, olr, sizeof(int));
	if (olr < 0)
		return -EINVAL;
1011

S
Stephen Hemminger 已提交
1012
	if (put_user(olr,optlen))
L
Linus Torvalds 已提交
1013
		return -EFAULT;
S
Stephen Hemminger 已提交
1014
	if (optname==MRT_VERSION)
L
Linus Torvalds 已提交
1015 1016
		val=0x0305;
#ifdef CONFIG_IP_PIMSM
S
Stephen Hemminger 已提交
1017
	else if (optname==MRT_PIM)
L
Linus Torvalds 已提交
1018 1019 1020 1021
		val=mroute_do_pim;
#endif
	else
		val=mroute_do_assert;
S
Stephen Hemminger 已提交
1022
	if (copy_to_user(optval,&val,olr))
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027 1028 1029
		return -EFAULT;
	return 0;
}

/*
 *	The IP multicast ioctl support routines.
 */
1030

L
Linus Torvalds 已提交
1031 1032 1033 1034 1035 1036
int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
{
	struct sioc_sg_req sr;
	struct sioc_vif_req vr;
	struct vif_device *vif;
	struct mfc_cache *c;
1037

S
Stephen Hemminger 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
	switch (cmd) {
	case SIOCGETVIFCNT:
		if (copy_from_user(&vr,arg,sizeof(vr)))
			return -EFAULT;
		if (vr.vifi>=maxvif)
			return -EINVAL;
		read_lock(&mrt_lock);
		vif=&vif_table[vr.vifi];
		if (VIF_EXISTS(vr.vifi))	{
			vr.icount=vif->pkt_in;
			vr.ocount=vif->pkt_out;
			vr.ibytes=vif->bytes_in;
			vr.obytes=vif->bytes_out;
L
Linus Torvalds 已提交
1051 1052
			read_unlock(&mrt_lock);

S
Stephen Hemminger 已提交
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
			if (copy_to_user(arg,&vr,sizeof(vr)))
				return -EFAULT;
			return 0;
		}
		read_unlock(&mrt_lock);
		return -EADDRNOTAVAIL;
	case SIOCGETSGCNT:
		if (copy_from_user(&sr,arg,sizeof(sr)))
			return -EFAULT;

		read_lock(&mrt_lock);
		c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr);
		if (c) {
			sr.pktcnt = c->mfc_un.res.pkt;
			sr.bytecnt = c->mfc_un.res.bytes;
			sr.wrong_if = c->mfc_un.res.wrong_if;
L
Linus Torvalds 已提交
1069
			read_unlock(&mrt_lock);
S
Stephen Hemminger 已提交
1070 1071 1072 1073 1074 1075 1076 1077 1078

			if (copy_to_user(arg,&sr,sizeof(sr)))
				return -EFAULT;
			return 0;
		}
		read_unlock(&mrt_lock);
		return -EADDRNOTAVAIL;
	default:
		return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
	}
}


static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct vif_device *v;
	int ct;
	if (event != NETDEV_UNREGISTER)
		return NOTIFY_DONE;
	v=&vif_table[0];
S
Stephen Hemminger 已提交
1090
	for (ct=0;ct<maxvif;ct++,v++) {
L
Linus Torvalds 已提交
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
		if (v->dev==ptr)
			vif_delete(ct);
	}
	return NOTIFY_DONE;
}


static struct notifier_block ip_mr_notifier={
	.notifier_call = ipmr_device_event,
};

/*
 * 	Encapsulate a packet by attaching a valid IPIP header to it.
 *	This avoids tunnel drivers and other mess and gives us the speed so
 *	important for multicast video.
 */
1107

A
Al Viro 已提交
1108
static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
L
Linus Torvalds 已提交
1109
{
1110
	struct iphdr *iph;
1111
	struct iphdr *old_iph = ip_hdr(skb);
1112 1113

	skb_push(skb, sizeof(struct iphdr));
1114
	skb->transport_header = skb->network_header;
1115
	skb_reset_network_header(skb);
1116
	iph = ip_hdr(skb);
L
Linus Torvalds 已提交
1117 1118

	iph->version	= 	4;
1119 1120
	iph->tos	=	old_iph->tos;
	iph->ttl	=	old_iph->ttl;
L
Linus Torvalds 已提交
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	iph->frag_off	=	0;
	iph->daddr	=	daddr;
	iph->saddr	=	saddr;
	iph->protocol	=	IPPROTO_IPIP;
	iph->ihl	=	5;
	iph->tot_len	=	htons(skb->len);
	ip_select_ident(iph, skb->dst, NULL);
	ip_send_check(iph);

	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
	nf_reset(skb);
}

static inline int ipmr_forward_finish(struct sk_buff *skb)
{
	struct ip_options * opt	= &(IPCB(skb)->opt);

	IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS);

	if (unlikely(opt->optlen))
		ip_forward_options(skb);

	return dst_output(skb);
}

/*
 *	Processing handlers for ipmr_forward
 */

static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi)
{
1152
	const struct iphdr *iph = ip_hdr(skb);
L
Linus Torvalds 已提交
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	struct vif_device *vif = &vif_table[vifi];
	struct net_device *dev;
	struct rtable *rt;
	int    encap = 0;

	if (vif->dev == NULL)
		goto out_free;

#ifdef CONFIG_IP_PIMSM
	if (vif->flags & VIFF_REGISTER) {
		vif->pkt_out++;
		vif->bytes_out+=skb->len;
1165 1166
		((struct net_device_stats*)netdev_priv(vif->dev))->tx_bytes += skb->len;
		((struct net_device_stats*)netdev_priv(vif->dev))->tx_packets++;
L
Linus Torvalds 已提交
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 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
		ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT);
		kfree_skb(skb);
		return;
	}
#endif

	if (vif->flags&VIFF_TUNNEL) {
		struct flowi fl = { .oif = vif->link,
				    .nl_u = { .ip4_u =
					      { .daddr = vif->remote,
						.saddr = vif->local,
						.tos = RT_TOS(iph->tos) } },
				    .proto = IPPROTO_IPIP };
		if (ip_route_output_key(&rt, &fl))
			goto out_free;
		encap = sizeof(struct iphdr);
	} else {
		struct flowi fl = { .oif = vif->link,
				    .nl_u = { .ip4_u =
					      { .daddr = iph->daddr,
						.tos = RT_TOS(iph->tos) } },
				    .proto = IPPROTO_IPIP };
		if (ip_route_output_key(&rt, &fl))
			goto out_free;
	}

	dev = rt->u.dst.dev;

	if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) {
		/* Do not fragment multicasts. Alas, IPv4 does not
		   allow to send ICMP, so that packets will disappear
		   to blackhole.
		 */

		IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS);
		ip_rt_put(rt);
		goto out_free;
	}

	encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len;

	if (skb_cow(skb, encap)) {
1209
		ip_rt_put(rt);
L
Linus Torvalds 已提交
1210 1211 1212 1213 1214 1215 1216 1217
		goto out_free;
	}

	vif->pkt_out++;
	vif->bytes_out+=skb->len;

	dst_release(skb->dst);
	skb->dst = &rt->u.dst;
1218
	ip_decrease_ttl(ip_hdr(skb));
L
Linus Torvalds 已提交
1219 1220 1221 1222 1223 1224

	/* FIXME: forward and output firewalls used to be called here.
	 * What do we do with netfilter? -- RR */
	if (vif->flags & VIFF_TUNNEL) {
		ip_encap(skb, vif->local, vif->remote);
		/* FIXME: extra output firewall step used to be here. --RR */
1225 1226
		((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_packets++;
		((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_bytes+=skb->len;
L
Linus Torvalds 已提交
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
	}

	IPCB(skb)->flags |= IPSKB_FORWARDED;

	/*
	 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
	 * not only before forwarding, but after forwarding on all output
	 * interfaces. It is clear, if mrouter runs a multicasting
	 * program, it should receive packets not depending to what interface
	 * program is joined.
	 * If we will not make it, the program will have to join on all
	 * interfaces. On the other hand, multihoming host (or router, but
	 * not mrouter) cannot join to more than one interface - it will
	 * result in receiving multiple packets.
	 */
1242
	NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev,
L
Linus Torvalds 已提交
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
		ipmr_forward_finish);
	return;

out_free:
	kfree_skb(skb);
	return;
}

static int ipmr_find_vif(struct net_device *dev)
{
	int ct;
	for (ct=maxvif-1; ct>=0; ct--) {
		if (vif_table[ct].dev == dev)
			break;
	}
	return ct;
}

/* "local" means that we should preserve one skb (for local delivery) */

static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local)
{
	int psend = -1;
	int vif, ct;

	vif = cache->mfc_parent;
	cache->mfc_un.res.pkt++;
	cache->mfc_un.res.bytes += skb->len;

	/*
	 * Wrong interface: drop packet and (maybe) send PIM assert.
	 */
	if (vif_table[vif].dev != skb->dev) {
		int true_vifi;

		if (((struct rtable*)skb->dst)->fl.iif == 0) {
			/* It is our own packet, looped back.
			   Very complicated situation...

			   The best workaround until routing daemons will be
			   fixed is not to redistribute packet, if it was
			   send through wrong interface. It means, that
			   multicast applications WILL NOT work for
			   (S,G), which have default multicast route pointing
			   to wrong oif. In any case, it is not a good
			   idea to use multicasting applications on router.
			 */
			goto dont_forward;
		}

		cache->mfc_un.res.wrong_if++;
		true_vifi = ipmr_find_vif(skb->dev);

		if (true_vifi >= 0 && mroute_do_assert &&
		    /* pimsm uses asserts, when switching from RPT to SPT,
		       so that we cannot check that packet arrived on an oif.
		       It is bad, but otherwise we would need to move pretty
		       large chunk of pimd to kernel. Ough... --ANK
		     */
		    (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) &&
1303
		    time_after(jiffies,
L
Linus Torvalds 已提交
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
			       cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
			cache->mfc_un.res.last_assert = jiffies;
			ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF);
		}
		goto dont_forward;
	}

	vif_table[vif].pkt_in++;
	vif_table[vif].bytes_in+=skb->len;

	/*
	 *	Forward the frame
	 */
	for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) {
1318
		if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
L
Linus Torvalds 已提交
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
			if (psend != -1) {
				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
				if (skb2)
					ipmr_queue_xmit(skb2, cache, psend);
			}
			psend=ct;
		}
	}
	if (psend != -1) {
		if (local) {
			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2)
				ipmr_queue_xmit(skb2, cache, psend);
		} else {
			ipmr_queue_xmit(skb, cache, psend);
			return 0;
		}
	}

dont_forward:
	if (!local)
		kfree_skb(skb);
	return 0;
}


/*
 *	Multicast packets for forwarding arrive here
 */

int ip_mr_input(struct sk_buff *skb)
{
	struct mfc_cache *cache;
	int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL;

	/* Packet is looped back after forward, it should not be
	   forwarded second time, but still can be delivered locally.
	 */
	if (IPCB(skb)->flags&IPSKB_FORWARDED)
		goto dont_forward;

	if (!local) {
		    if (IPCB(skb)->opt.router_alert) {
			    if (ip_call_ra_chain(skb))
				    return 0;
1364
		    } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){
L
Linus Torvalds 已提交
1365 1366 1367 1368 1369 1370 1371 1372
			    /* IGMPv1 (and broken IGMPv2 implementations sort of
			       Cisco IOS <= 11.2(8)) do not put router alert
			       option to IGMP packets destined to routable
			       groups. It is very bad, because it means
			       that we can forward NO IGMP messages.
			     */
			    read_lock(&mrt_lock);
			    if (mroute_socket) {
1373
				    nf_reset(skb);
L
Linus Torvalds 已提交
1374 1375 1376 1377 1378 1379 1380 1381 1382
				    raw_rcv(mroute_socket, skb);
				    read_unlock(&mrt_lock);
				    return 0;
			    }
			    read_unlock(&mrt_lock);
		    }
	}

	read_lock(&mrt_lock);
1383
	cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
L
Linus Torvalds 已提交
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439

	/*
	 *	No usable cache entry
	 */
	if (cache==NULL) {
		int vif;

		if (local) {
			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
			ip_local_deliver(skb);
			if (skb2 == NULL) {
				read_unlock(&mrt_lock);
				return -ENOBUFS;
			}
			skb = skb2;
		}

		vif = ipmr_find_vif(skb->dev);
		if (vif >= 0) {
			int err = ipmr_cache_unresolved(vif, skb);
			read_unlock(&mrt_lock);

			return err;
		}
		read_unlock(&mrt_lock);
		kfree_skb(skb);
		return -ENODEV;
	}

	ip_mr_forward(skb, cache, local);

	read_unlock(&mrt_lock);

	if (local)
		return ip_local_deliver(skb);

	return 0;

dont_forward:
	if (local)
		return ip_local_deliver(skb);
	kfree_skb(skb);
	return 0;
}

#ifdef CONFIG_IP_PIMSM_V1
/*
 * Handle IGMP messages of PIMv1
 */

int pim_rcv_v1(struct sk_buff * skb)
{
	struct igmphdr *pim;
	struct iphdr   *encap;
	struct net_device  *reg_dev = NULL;

1440
	if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
L
Linus Torvalds 已提交
1441 1442
		goto drop;

1443
	pim = igmp_hdr(skb);
L
Linus Torvalds 已提交
1444

1445
	if (!mroute_do_pim ||
L
Linus Torvalds 已提交
1446
	    skb->len < sizeof(*pim) + sizeof(*encap) ||
1447
	    pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
L
Linus Torvalds 已提交
1448 1449
		goto drop;

1450 1451
	encap = (struct iphdr *)(skb_transport_header(skb) +
				 sizeof(struct igmphdr));
L
Linus Torvalds 已提交
1452 1453 1454 1455 1456 1457 1458 1459
	/*
	   Check that:
	   a. packet is really destinted to a multicast group
	   b. packet is not a NULL-REGISTER
	   c. packet is not truncated
	 */
	if (!MULTICAST(encap->daddr) ||
	    encap->tot_len == 0 ||
1460
	    ntohs(encap->tot_len) + sizeof(*pim) > skb->len)
L
Linus Torvalds 已提交
1461 1462 1463 1464 1465 1466 1467 1468 1469
		goto drop;

	read_lock(&mrt_lock);
	if (reg_vif_num >= 0)
		reg_dev = vif_table[reg_vif_num].dev;
	if (reg_dev)
		dev_hold(reg_dev);
	read_unlock(&mrt_lock);

1470
	if (reg_dev == NULL)
L
Linus Torvalds 已提交
1471 1472
		goto drop;

1473
	skb->mac_header = skb->network_header;
L
Linus Torvalds 已提交
1474
	skb_pull(skb, (u8*)encap - skb->data);
1475
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
1476 1477 1478 1479 1480 1481
	skb->dev = reg_dev;
	skb->protocol = htons(ETH_P_IP);
	skb->ip_summed = 0;
	skb->pkt_type = PACKET_HOST;
	dst_release(skb->dst);
	skb->dst = NULL;
1482 1483
	((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len;
	((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++;
L
Linus Torvalds 已提交
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
	nf_reset(skb);
	netif_rx(skb);
	dev_put(reg_dev);
	return 0;
 drop:
	kfree_skb(skb);
	return 0;
}
#endif

#ifdef CONFIG_IP_PIMSM_V2
static int pim_rcv(struct sk_buff * skb)
{
	struct pimreghdr *pim;
	struct iphdr   *encap;
	struct net_device  *reg_dev = NULL;

1501
	if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
L
Linus Torvalds 已提交
1502 1503
		goto drop;

1504
	pim = (struct pimreghdr *)skb_transport_header(skb);
1505
	if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) ||
L
Linus Torvalds 已提交
1506
	    (pim->flags&PIM_NULL_REGISTER) ||
1507
	    (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
1508
	     csum_fold(skb_checksum(skb, 0, skb->len, 0))))
L
Linus Torvalds 已提交
1509 1510 1511
		goto drop;

	/* check if the inner packet is destined to mcast group */
1512 1513
	encap = (struct iphdr *)(skb_transport_header(skb) +
				 sizeof(struct pimreghdr));
L
Linus Torvalds 已提交
1514 1515
	if (!MULTICAST(encap->daddr) ||
	    encap->tot_len == 0 ||
1516
	    ntohs(encap->tot_len) + sizeof(*pim) > skb->len)
L
Linus Torvalds 已提交
1517 1518 1519 1520 1521 1522 1523 1524 1525
		goto drop;

	read_lock(&mrt_lock);
	if (reg_vif_num >= 0)
		reg_dev = vif_table[reg_vif_num].dev;
	if (reg_dev)
		dev_hold(reg_dev);
	read_unlock(&mrt_lock);

1526
	if (reg_dev == NULL)
L
Linus Torvalds 已提交
1527 1528
		goto drop;

1529
	skb->mac_header = skb->network_header;
L
Linus Torvalds 已提交
1530
	skb_pull(skb, (u8*)encap - skb->data);
1531
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
1532 1533 1534 1535 1536
	skb->dev = reg_dev;
	skb->protocol = htons(ETH_P_IP);
	skb->ip_summed = 0;
	skb->pkt_type = PACKET_HOST;
	dst_release(skb->dst);
1537 1538
	((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len;
	((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++;
L
Linus Torvalds 已提交
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
	skb->dst = NULL;
	nf_reset(skb);
	netif_rx(skb);
	dev_put(reg_dev);
	return 0;
 drop:
	kfree_skb(skb);
	return 0;
}
#endif

static int
ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm)
{
	int ct;
	struct rtnexthop *nhp;
	struct net_device *dev = vif_table[c->mfc_parent].dev;
1556
	u8 *b = skb_tail_pointer(skb);
L
Linus Torvalds 已提交
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
	struct rtattr *mp_head;

	if (dev)
		RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex);

	mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0));

	for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
		if (c->mfc_un.res.ttls[ct] < 255) {
			if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
				goto rtattr_failure;
			nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
			nhp->rtnh_flags = 0;
			nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
			nhp->rtnh_ifindex = vif_table[ct].dev->ifindex;
			nhp->rtnh_len = sizeof(*nhp);
		}
	}
	mp_head->rta_type = RTA_MULTIPATH;
1576
	mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
L
Linus Torvalds 已提交
1577 1578 1579 1580
	rtm->rtm_type = RTN_MULTICAST;
	return 1;

rtattr_failure:
1581
	nlmsg_trim(skb, b);
L
Linus Torvalds 已提交
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
	return -EMSGSIZE;
}

int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
{
	int err;
	struct mfc_cache *cache;
	struct rtable *rt = (struct rtable*)skb->dst;

	read_lock(&mrt_lock);
	cache = ipmr_cache_find(rt->rt_src, rt->rt_dst);

	if (cache==NULL) {
1595
		struct sk_buff *skb2;
1596
		struct iphdr *iph;
L
Linus Torvalds 已提交
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
		struct net_device *dev;
		int vif;

		if (nowait) {
			read_unlock(&mrt_lock);
			return -EAGAIN;
		}

		dev = skb->dev;
		if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) {
			read_unlock(&mrt_lock);
			return -ENODEV;
		}
1610 1611 1612 1613 1614 1615
		skb2 = skb_clone(skb, GFP_ATOMIC);
		if (!skb2) {
			read_unlock(&mrt_lock);
			return -ENOMEM;
		}

1616 1617
		skb_push(skb2, sizeof(struct iphdr));
		skb_reset_network_header(skb2);
1618 1619 1620 1621 1622
		iph = ip_hdr(skb2);
		iph->ihl = sizeof(struct iphdr) >> 2;
		iph->saddr = rt->rt_src;
		iph->daddr = rt->rt_dst;
		iph->version = 0;
1623
		err = ipmr_cache_unresolved(vif, skb2);
L
Linus Torvalds 已提交
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
		read_unlock(&mrt_lock);
		return err;
	}

	if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
		cache->mfc_flags |= MFC_NOTIFY;
	err = ipmr_fill_mroute(skb, cache, rtm);
	read_unlock(&mrt_lock);
	return err;
}

1635
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
/*
 *	The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif
 */
struct ipmr_vif_iter {
	int ct;
};

static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter,
					   loff_t pos)
{
	for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) {
S
Stephen Hemminger 已提交
1647
		if (!VIF_EXISTS(iter->ct))
L
Linus Torvalds 已提交
1648
			continue;
1649
		if (pos-- == 0)
L
Linus Torvalds 已提交
1650 1651 1652 1653 1654 1655 1656 1657
			return &vif_table[iter->ct];
	}
	return NULL;
}

static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
{
	read_lock(&mrt_lock);
1658
	return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1)
L
Linus Torvalds 已提交
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668
		: SEQ_START_TOKEN;
}

static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ipmr_vif_iter *iter = seq->private;

	++*pos;
	if (v == SEQ_START_TOKEN)
		return ipmr_vif_seq_idx(iter, 0);
1669

L
Linus Torvalds 已提交
1670
	while (++iter->ct < maxvif) {
S
Stephen Hemminger 已提交
1671
		if (!VIF_EXISTS(iter->ct))
L
Linus Torvalds 已提交
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
			continue;
		return &vif_table[iter->ct];
	}
	return NULL;
}

static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
{
	read_unlock(&mrt_lock);
}

static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN) {
1686
		seq_puts(seq,
L
Linus Torvalds 已提交
1687 1688 1689 1690 1691 1692 1693 1694
			 "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags Local    Remote\n");
	} else {
		const struct vif_device *vif = v;
		const char *name =  vif->dev ? vif->dev->name : "none";

		seq_printf(seq,
			   "%2Zd %-10s %8ld %7ld  %8ld %7ld %05X %08X %08X\n",
			   vif - vif_table,
1695
			   name, vif->bytes_in, vif->pkt_in,
L
Linus Torvalds 已提交
1696 1697 1698 1699 1700 1701
			   vif->bytes_out, vif->pkt_out,
			   vif->flags, vif->local, vif->remote);
	}
	return 0;
}

1702
static const struct seq_operations ipmr_vif_seq_ops = {
L
Linus Torvalds 已提交
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
	.start = ipmr_vif_seq_start,
	.next  = ipmr_vif_seq_next,
	.stop  = ipmr_vif_seq_stop,
	.show  = ipmr_vif_seq_show,
};

static int ipmr_vif_open(struct inode *inode, struct file *file)
{
	struct seq_file *seq;
	int rc = -ENOMEM;
	struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
1714

L
Linus Torvalds 已提交
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732
	if (!s)
		goto out;

	rc = seq_open(file, &ipmr_vif_seq_ops);
	if (rc)
		goto out_kfree;

	s->ct = 0;
	seq = file->private_data;
	seq->private = s;
out:
	return rc;
out_kfree:
	kfree(s);
	goto out;

}

1733
static const struct file_operations ipmr_vif_fops = {
L
Linus Torvalds 已提交
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752
	.owner	 = THIS_MODULE,
	.open    = ipmr_vif_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_private,
};

struct ipmr_mfc_iter {
	struct mfc_cache **cache;
	int ct;
};


static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
{
	struct mfc_cache *mfc;

	it->cache = mfc_cache_array;
	read_lock(&mrt_lock);
1753
	for (it->ct = 0; it->ct < MFC_LINES; it->ct++)
S
Stephen Hemminger 已提交
1754
		for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next)
1755
			if (pos-- == 0)
L
Linus Torvalds 已提交
1756 1757 1758 1759 1760
				return mfc;
	read_unlock(&mrt_lock);

	it->cache = &mfc_unres_queue;
	spin_lock_bh(&mfc_unres_lock);
S
Stephen Hemminger 已提交
1761
	for (mfc = mfc_unres_queue; mfc; mfc = mfc->next)
L
Linus Torvalds 已提交
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
		if (pos-- == 0)
			return mfc;
	spin_unlock_bh(&mfc_unres_lock);

	it->cache = NULL;
	return NULL;
}


static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct ipmr_mfc_iter *it = seq->private;
	it->cache = NULL;
	it->ct = 0;
1776
	return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1)
L
Linus Torvalds 已提交
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791
		: SEQ_START_TOKEN;
}

static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct mfc_cache *mfc = v;
	struct ipmr_mfc_iter *it = seq->private;

	++*pos;

	if (v == SEQ_START_TOKEN)
		return ipmr_mfc_seq_idx(seq->private, 0);

	if (mfc->next)
		return mfc->next;
1792 1793

	if (it->cache == &mfc_unres_queue)
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
		goto end_of_list;

	BUG_ON(it->cache != mfc_cache_array);

	while (++it->ct < MFC_LINES) {
		mfc = mfc_cache_array[it->ct];
		if (mfc)
			return mfc;
	}

	/* exhausted cache_array, show unresolved */
	read_unlock(&mrt_lock);
	it->cache = &mfc_unres_queue;
	it->ct = 0;
1808

L
Linus Torvalds 已提交
1809 1810
	spin_lock_bh(&mfc_unres_lock);
	mfc = mfc_unres_queue;
1811
	if (mfc)
L
Linus Torvalds 已提交
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
		return mfc;

 end_of_list:
	spin_unlock_bh(&mfc_unres_lock);
	it->cache = NULL;

	return NULL;
}

static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
{
	struct ipmr_mfc_iter *it = seq->private;

	if (it->cache == &mfc_unres_queue)
		spin_unlock_bh(&mfc_unres_lock);
	else if (it->cache == mfc_cache_array)
		read_unlock(&mrt_lock);
}

static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
{
	int n;

	if (v == SEQ_START_TOKEN) {
1836
		seq_puts(seq,
L
Linus Torvalds 已提交
1837 1838 1839 1840
		 "Group    Origin   Iif     Pkts    Bytes    Wrong Oifs\n");
	} else {
		const struct mfc_cache *mfc = v;
		const struct ipmr_mfc_iter *it = seq->private;
1841

L
Linus Torvalds 已提交
1842 1843 1844 1845 1846 1847 1848 1849 1850
		seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld",
			   (unsigned long) mfc->mfc_mcastgrp,
			   (unsigned long) mfc->mfc_origin,
			   mfc->mfc_parent,
			   mfc->mfc_un.res.pkt,
			   mfc->mfc_un.res.bytes,
			   mfc->mfc_un.res.wrong_if);

		if (it->cache != &mfc_unres_queue) {
S
Stephen Hemminger 已提交
1851 1852 1853
			for (n = mfc->mfc_un.res.minvif;
			     n < mfc->mfc_un.res.maxvif; n++ ) {
				if (VIF_EXISTS(n)
L
Linus Torvalds 已提交
1854
				   && mfc->mfc_un.res.ttls[n] < 255)
1855 1856
				seq_printf(seq,
					   " %2d:%-3d",
L
Linus Torvalds 已提交
1857 1858 1859 1860 1861 1862 1863 1864
					   n, mfc->mfc_un.res.ttls[n]);
			}
		}
		seq_putc(seq, '\n');
	}
	return 0;
}

1865
static const struct seq_operations ipmr_mfc_seq_ops = {
L
Linus Torvalds 已提交
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
	.start = ipmr_mfc_seq_start,
	.next  = ipmr_mfc_seq_next,
	.stop  = ipmr_mfc_seq_stop,
	.show  = ipmr_mfc_seq_show,
};

static int ipmr_mfc_open(struct inode *inode, struct file *file)
{
	struct seq_file *seq;
	int rc = -ENOMEM;
	struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
1877

L
Linus Torvalds 已提交
1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
	if (!s)
		goto out;

	rc = seq_open(file, &ipmr_mfc_seq_ops);
	if (rc)
		goto out_kfree;

	seq = file->private_data;
	seq->private = s;
out:
	return rc;
out_kfree:
	kfree(s);
	goto out;

}

1895
static const struct file_operations ipmr_mfc_fops = {
L
Linus Torvalds 已提交
1896 1897 1898 1899 1900 1901
	.owner	 = THIS_MODULE,
	.open    = ipmr_mfc_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_private,
};
1902
#endif
L
Linus Torvalds 已提交
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913

#ifdef CONFIG_IP_PIMSM_V2
static struct net_protocol pim_protocol = {
	.handler	=	pim_rcv,
};
#endif


/*
 *	Setup for IP multicast routing
 */
1914

L
Linus Torvalds 已提交
1915 1916 1917 1918
void __init ip_mr_init(void)
{
	mrt_cachep = kmem_cache_create("ip_mrt_cache",
				       sizeof(struct mfc_cache),
A
Alexey Dobriyan 已提交
1919
				       0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1920
				       NULL);
L
Linus Torvalds 已提交
1921 1922 1923
	init_timer(&ipmr_expire_timer);
	ipmr_expire_timer.function=ipmr_expire_process;
	register_netdevice_notifier(&ip_mr_notifier);
1924
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1925 1926
	proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops);
	proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops);
1927
#endif
L
Linus Torvalds 已提交
1928
}