route.c 57.6 KB
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/*
 *	Linux INET6 implementation
 *	FIB front-end.
 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	$Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
 *
 *	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.
 */

/*	Changes:
 *
 *	YOSHIFUJI Hideaki @USAGI
 *		reworked default router selection.
 *		- respect outgoing interface
 *		- select from (probably) reachable routers (i.e.
 *		routers in REACHABLE, STALE, DELAY or PROBE states).
 *		- always select the same router if it is (probably)
 *		reachable.  otherwise, round-robin the list.
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 *	Ville Nuorvala
 *		Fixed routing subtrees.
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 */

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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/types.h>
#include <linux/times.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/route.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/init.h>
#include <linux/if_arp.h>

#ifdef 	CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif

#include <net/snmp.h>
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/tcp.h>
#include <linux/rtnetlink.h>
#include <net/dst.h>
#include <net/xfrm.h>
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#include <net/netevent.h>
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#include <net/netlink.h>
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#include <asm/uaccess.h>

#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

/* Set to 3 to get tracing. */
#define RT6_DEBUG 2

#if RT6_DEBUG >= 3
#define RDBG(x) printk x
#define RT6_TRACE(x...) printk(KERN_DEBUG x)
#else
#define RDBG(x)
#define RT6_TRACE(x...) do { ; } while (0)
#endif

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#define CLONE_OFFLINK_ROUTE 0
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static int ip6_rt_max_size = 4096;
static int ip6_rt_gc_min_interval = HZ / 2;
static int ip6_rt_gc_timeout = 60*HZ;
int ip6_rt_gc_interval = 30*HZ;
static int ip6_rt_gc_elasticity = 9;
static int ip6_rt_mtu_expires = 10*60*HZ;
static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;

static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
static struct dst_entry	*ip6_dst_check(struct dst_entry *dst, u32 cookie);
static struct dst_entry *ip6_negative_advice(struct dst_entry *);
static void		ip6_dst_destroy(struct dst_entry *);
static void		ip6_dst_ifdown(struct dst_entry *,
				       struct net_device *dev, int how);
static int		 ip6_dst_gc(void);

static int		ip6_pkt_discard(struct sk_buff *skb);
static int		ip6_pkt_discard_out(struct sk_buff *skb);
static void		ip6_link_failure(struct sk_buff *skb);
static void		ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);

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#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref);
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex);
#endif

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static struct dst_ops ip6_dst_ops = {
	.family			=	AF_INET6,
	.protocol		=	__constant_htons(ETH_P_IPV6),
	.gc			=	ip6_dst_gc,
	.gc_thresh		=	1024,
	.check			=	ip6_dst_check,
	.destroy		=	ip6_dst_destroy,
	.ifdown			=	ip6_dst_ifdown,
	.negative_advice	=	ip6_negative_advice,
	.link_failure		=	ip6_link_failure,
	.update_pmtu		=	ip6_rt_update_pmtu,
	.entry_size		=	sizeof(struct rt6_info),
};

struct rt6_info ip6_null_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.dev		= &loopback_dev,
			.obsolete	= -1,
			.error		= -ENETUNREACH,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
			.input		= ip6_pkt_discard,
			.output		= ip6_pkt_discard_out,
			.ops		= &ip6_dst_ops,
			.path		= (struct dst_entry*)&ip6_null_entry,
		}
	},
	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
	.rt6i_metric	= ~(u32) 0,
	.rt6i_ref	= ATOMIC_INIT(1),
};

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#ifdef CONFIG_IPV6_MULTIPLE_TABLES

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static int ip6_pkt_prohibit(struct sk_buff *skb);
static int ip6_pkt_prohibit_out(struct sk_buff *skb);
static int ip6_pkt_blk_hole(struct sk_buff *skb);

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struct rt6_info ip6_prohibit_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.dev		= &loopback_dev,
			.obsolete	= -1,
			.error		= -EACCES,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
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			.input		= ip6_pkt_prohibit,
			.output		= ip6_pkt_prohibit_out,
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			.ops		= &ip6_dst_ops,
			.path		= (struct dst_entry*)&ip6_prohibit_entry,
		}
	},
	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
	.rt6i_metric	= ~(u32) 0,
	.rt6i_ref	= ATOMIC_INIT(1),
};

struct rt6_info ip6_blk_hole_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.dev		= &loopback_dev,
			.obsolete	= -1,
			.error		= -EINVAL,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
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			.input		= ip6_pkt_blk_hole,
			.output		= ip6_pkt_blk_hole,
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			.ops		= &ip6_dst_ops,
			.path		= (struct dst_entry*)&ip6_blk_hole_entry,
		}
	},
	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
	.rt6i_metric	= ~(u32) 0,
	.rt6i_ref	= ATOMIC_INIT(1),
};

#endif

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/* allocate dst with ip6_dst_ops */
static __inline__ struct rt6_info *ip6_dst_alloc(void)
{
	return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
}

static void ip6_dst_destroy(struct dst_entry *dst)
{
	struct rt6_info *rt = (struct rt6_info *)dst;
	struct inet6_dev *idev = rt->rt6i_idev;

	if (idev != NULL) {
		rt->rt6i_idev = NULL;
		in6_dev_put(idev);
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	}
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}

static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			   int how)
{
	struct rt6_info *rt = (struct rt6_info *)dst;
	struct inet6_dev *idev = rt->rt6i_idev;

	if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
		struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
		if (loopback_idev != NULL) {
			rt->rt6i_idev = loopback_idev;
			in6_dev_put(idev);
		}
	}
}

static __inline__ int rt6_check_expired(const struct rt6_info *rt)
{
	return (rt->rt6i_flags & RTF_EXPIRES &&
		time_after(jiffies, rt->rt6i_expires));
}

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static inline int rt6_need_strict(struct in6_addr *daddr)
{
	return (ipv6_addr_type(daddr) &
		(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
}

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/*
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 *	Route lookup. Any table->tb6_lock is implied.
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 */

static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
						    int oif,
						    int strict)
{
	struct rt6_info *local = NULL;
	struct rt6_info *sprt;

	if (oif) {
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		for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
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			struct net_device *dev = sprt->rt6i_dev;
			if (dev->ifindex == oif)
				return sprt;
			if (dev->flags & IFF_LOOPBACK) {
				if (sprt->rt6i_idev == NULL ||
				    sprt->rt6i_idev->dev->ifindex != oif) {
					if (strict && oif)
						continue;
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					if (local && (!oif ||
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						      local->rt6i_idev->dev->ifindex == oif))
						continue;
				}
				local = sprt;
			}
		}

		if (local)
			return local;

		if (strict)
			return &ip6_null_entry;
	}
	return rt;
}

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#ifdef CONFIG_IPV6_ROUTER_PREF
static void rt6_probe(struct rt6_info *rt)
{
	struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
	/*
	 * Okay, this does not seem to be appropriate
	 * for now, however, we need to check if it
	 * is really so; aka Router Reachability Probing.
	 *
	 * Router Reachability Probe MUST be rate-limited
	 * to no more than one per minute.
	 */
	if (!neigh || (neigh->nud_state & NUD_VALID))
		return;
	read_lock_bh(&neigh->lock);
	if (!(neigh->nud_state & NUD_VALID) &&
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	    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
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		struct in6_addr mcaddr;
		struct in6_addr *target;

		neigh->updated = jiffies;
		read_unlock_bh(&neigh->lock);

		target = (struct in6_addr *)&neigh->primary_key;
		addrconf_addr_solict_mult(target, &mcaddr);
		ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
	} else
		read_unlock_bh(&neigh->lock);
}
#else
static inline void rt6_probe(struct rt6_info *rt)
{
	return;
}
#endif

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/*
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 * Default Router Selection (RFC 2461 6.3.6)
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 */
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static inline int rt6_check_dev(struct rt6_info *rt, int oif)
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{
	struct net_device *dev = rt->rt6i_dev;
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	if (!oif || dev->ifindex == oif)
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		return 2;
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	if ((dev->flags & IFF_LOOPBACK) &&
	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
		return 1;
	return 0;
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}
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static inline int rt6_check_neigh(struct rt6_info *rt)
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{
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	struct neighbour *neigh = rt->rt6i_nexthop;
	int m = 0;
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	if (rt->rt6i_flags & RTF_NONEXTHOP ||
	    !(rt->rt6i_flags & RTF_GATEWAY))
		m = 1;
	else if (neigh) {
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		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID)
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			m = 2;
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		else if (!(neigh->nud_state & NUD_FAILED))
			m = 1;
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		read_unlock_bh(&neigh->lock);
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	}
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	return m;
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}

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static int rt6_score_route(struct rt6_info *rt, int oif,
			   int strict)
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{
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	int m, n;
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	m = rt6_check_dev(rt, oif);
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	if (!m && (strict & RT6_LOOKUP_F_IFACE))
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		return -1;
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#ifdef CONFIG_IPV6_ROUTER_PREF
	m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
#endif
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	n = rt6_check_neigh(rt);
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	if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
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		return -1;
	return m;
}

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static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
				   int *mpri, struct rt6_info *match)
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{
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	int m;

	if (rt6_check_expired(rt))
		goto out;

	m = rt6_score_route(rt, oif, strict);
	if (m < 0)
		goto out;

	if (m > *mpri) {
		if (strict & RT6_LOOKUP_F_REACHABLE)
			rt6_probe(match);
		*mpri = m;
		match = rt;
	} else if (strict & RT6_LOOKUP_F_REACHABLE) {
		rt6_probe(rt);
	}

out:
	return match;
}

static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
				     struct rt6_info *rr_head,
				     u32 metric, int oif, int strict)
{
	struct rt6_info *rt, *match;
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	int mpri = -1;
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	match = NULL;
	for (rt = rr_head; rt && rt->rt6i_metric == metric;
	     rt = rt->u.dst.rt6_next)
		match = find_match(rt, oif, strict, &mpri, match);
	for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
	     rt = rt->u.dst.rt6_next)
		match = find_match(rt, oif, strict, &mpri, match);
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	return match;
}
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static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
{
	struct rt6_info *match, *rt0;
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	RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
		  __FUNCTION__, fn->leaf, oif);
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	rt0 = fn->rr_ptr;
	if (!rt0)
		fn->rr_ptr = rt0 = fn->leaf;
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	match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
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	if (!match &&
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	    (strict & RT6_LOOKUP_F_REACHABLE)) {
		struct rt6_info *next = rt0->u.dst.rt6_next;

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		/* no entries matched; do round-robin */
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		if (!next || next->rt6i_metric != rt0->rt6i_metric)
			next = fn->leaf;

		if (next != rt0)
			fn->rr_ptr = next;
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	}

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	RT6_TRACE("%s() => %p\n",
		  __FUNCTION__, match);
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	return (match ? match : &ip6_null_entry);
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}

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#ifdef CONFIG_IPV6_ROUTE_INFO
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
		  struct in6_addr *gwaddr)
{
	struct route_info *rinfo = (struct route_info *) opt;
	struct in6_addr prefix_buf, *prefix;
	unsigned int pref;
	u32 lifetime;
	struct rt6_info *rt;

	if (len < sizeof(struct route_info)) {
		return -EINVAL;
	}

	/* Sanity check for prefix_len and length */
	if (rinfo->length > 3) {
		return -EINVAL;
	} else if (rinfo->prefix_len > 128) {
		return -EINVAL;
	} else if (rinfo->prefix_len > 64) {
		if (rinfo->length < 2) {
			return -EINVAL;
		}
	} else if (rinfo->prefix_len > 0) {
		if (rinfo->length < 1) {
			return -EINVAL;
		}
	}

	pref = rinfo->route_pref;
	if (pref == ICMPV6_ROUTER_PREF_INVALID)
		pref = ICMPV6_ROUTER_PREF_MEDIUM;

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	lifetime = ntohl(rinfo->lifetime);
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	if (lifetime == 0xffffffff) {
		/* infinity */
	} else if (lifetime > 0x7fffffff/HZ) {
		/* Avoid arithmetic overflow */
		lifetime = 0x7fffffff/HZ - 1;
	}

	if (rinfo->length == 3)
		prefix = (struct in6_addr *)rinfo->prefix;
	else {
		/* this function is safe */
		ipv6_addr_prefix(&prefix_buf,
				 (struct in6_addr *)rinfo->prefix,
				 rinfo->prefix_len);
		prefix = &prefix_buf;
	}

	rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);

	if (rt && !lifetime) {
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		ip6_del_rt(rt);
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		rt = NULL;
	}

	if (!rt && lifetime)
		rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
					pref);
	else if (rt)
		rt->rt6i_flags = RTF_ROUTEINFO |
				 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);

	if (rt) {
		if (lifetime == 0xffffffff) {
			rt->rt6i_flags &= ~RTF_EXPIRES;
		} else {
			rt->rt6i_expires = jiffies + HZ * lifetime;
			rt->rt6i_flags |= RTF_EXPIRES;
		}
		dst_release(&rt->u.dst);
	}
	return 0;
}
#endif

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#define BACKTRACK(saddr) \
do { \
	if (rt == &ip6_null_entry) { \
		struct fib6_node *pn; \
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		while (1) { \
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			if (fn->fn_flags & RTN_TL_ROOT) \
				goto out; \
			pn = fn->parent; \
			if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
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				fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
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			else \
				fn = pn; \
			if (fn->fn_flags & RTN_RTINFO) \
				goto restart; \
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		} \
	} \
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} while(0)
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static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
					     struct flowi *fl, int flags)
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{
	struct fib6_node *fn;
	struct rt6_info *rt;

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	read_lock_bh(&table->tb6_lock);
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
restart:
	rt = fn->leaf;
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	rt = rt6_device_match(rt, fl->oif, flags);
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	BACKTRACK(&fl->fl6_src);
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out:
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	dst_hold(&rt->u.dst);
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	read_unlock_bh(&table->tb6_lock);
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	rt->u.dst.lastuse = jiffies;
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	rt->u.dst.__use++;

	return rt;

}

struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
			    int oif, int strict)
{
	struct flowi fl = {
		.oif = oif,
		.nl_u = {
			.ip6_u = {
				.daddr = *daddr,
			},
		},
	};
	struct dst_entry *dst;
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	int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
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	if (saddr) {
		memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
		flags |= RT6_LOOKUP_F_HAS_SADDR;
	}

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	dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
	if (dst->error == 0)
		return (struct rt6_info *) dst;

	dst_release(dst);

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	return NULL;
}

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EXPORT_SYMBOL(rt6_lookup);

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/* ip6_ins_rt is called with FREE table->tb6_lock.
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   It takes new route entry, the addition fails by any reason the
   route is freed. In any case, if caller does not hold it, it may
   be destroyed.
 */

586
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
587 588
{
	int err;
T
Thomas Graf 已提交
589
	struct fib6_table *table;
L
Linus Torvalds 已提交
590

T
Thomas Graf 已提交
591 592
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
593
	err = fib6_add(&table->tb6_root, rt, info);
T
Thomas Graf 已提交
594
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
595 596 597 598

	return err;
}

599 600
int ip6_ins_rt(struct rt6_info *rt)
{
601
	return __ip6_ins_rt(rt, NULL);
602 603
}

604 605
static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
				      struct in6_addr *saddr)
L
Linus Torvalds 已提交
606 607 608 609 610 611 612 613 614 615
{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
616 617 618 619
		if (!(rt->rt6i_flags&RTF_GATEWAY)) {
			if (rt->rt6i_dst.plen != 128 &&
			    ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
				rt->rt6i_flags |= RTF_ANYCAST;
L
Linus Torvalds 已提交
620
			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
621
		}
L
Linus Torvalds 已提交
622

623
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
L
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624 625 626 627 628 629 630 631 632 633 634 635 636
		rt->rt6i_dst.plen = 128;
		rt->rt6i_flags |= RTF_CACHE;
		rt->u.dst.flags |= DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
		if (rt->rt6i_src.plen && saddr) {
			ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
			rt->rt6i_src.plen = 128;
		}
#endif

		rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);

637
	}
L
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638

639 640
	return rt;
}
L
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641

642 643 644 645 646 647 648 649 650 651 652 653 654
static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
{
	struct rt6_info *rt = ip6_rt_copy(ort);
	if (rt) {
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
		rt->rt6i_dst.plen = 128;
		rt->rt6i_flags |= RTF_CACHE;
		rt->u.dst.flags |= DST_HOST;
		rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
	}
	return rt;
}

A
Adrian Bunk 已提交
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static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
L
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657 658
{
	struct fib6_node *fn;
659
	struct rt6_info *rt, *nrt;
T
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660
	int strict = 0;
L
Linus Torvalds 已提交
661
	int attempts = 3;
662
	int err;
663
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
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664

665
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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666 667

relookup:
T
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668
	read_lock_bh(&table->tb6_lock);
L
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669

670
restart_2:
T
Thomas Graf 已提交
671
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
672 673

restart:
674
	rt = rt6_select(fn, fl->iif, strict | reachable);
675
	BACKTRACK(&fl->fl6_src);
676 677
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
678
		goto out;
L
Linus Torvalds 已提交
679

680
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
681
	read_unlock_bh(&table->tb6_lock);
682

683
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
Thomas Graf 已提交
684
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
685 686
	else {
#if CLONE_OFFLINK_ROUTE
T
Thomas Graf 已提交
687
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
688 689 690 691
#else
		goto out2;
#endif
	}
692

693 694
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
Linus Torvalds 已提交
695

696 697
	dst_hold(&rt->u.dst);
	if (nrt) {
698
		err = ip6_ins_rt(nrt);
699
		if (!err)
L
Linus Torvalds 已提交
700 701 702
			goto out2;
	}

703 704 705 706
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
707
	 * Race condition! In the gap, when table->tb6_lock was
708 709 710 711 712 713
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
714 715 716 717
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
718
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
719
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
720 721 722
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
Thomas Graf 已提交
723 724

	return rt;
L
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}

T
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void ip6_route_input(struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
730
	int flags = RT6_LOOKUP_F_HAS_SADDR;
T
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731 732 733 734 735 736
	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
A
Al Viro 已提交
737
				.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
T
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738 739
			},
		},
740
		.mark = skb->mark,
T
Thomas Graf 已提交
741 742
		.proto = iph->nexthdr,
	};
743 744 745

	if (rt6_need_strict(&iph->daddr))
		flags |= RT6_LOOKUP_F_IFACE;
T
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746 747 748 749 750 751

	skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
}

static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
					     struct flowi *fl, int flags)
L
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{
	struct fib6_node *fn;
754
	struct rt6_info *rt, *nrt;
T
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755
	int strict = 0;
L
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756
	int attempts = 3;
757
	int err;
758
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
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759

760
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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761 762

relookup:
T
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763
	read_lock_bh(&table->tb6_lock);
L
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764

765
restart_2:
T
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766
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
767 768

restart:
769
	rt = rt6_select(fn, fl->oif, strict | reachable);
770
	BACKTRACK(&fl->fl6_src);
771 772
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
L
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773 774
		goto out;

775
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
776
	read_unlock_bh(&table->tb6_lock);
777

778
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
779
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
780 781 782 783 784 785 786
	else {
#if CLONE_OFFLINK_ROUTE
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
#else
		goto out2;
#endif
	}
L
Linus Torvalds 已提交
787

788 789
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
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790

791 792
	dst_hold(&rt->u.dst);
	if (nrt) {
793
		err = ip6_ins_rt(nrt);
794
		if (!err)
L
Linus Torvalds 已提交
795 796
			goto out2;
	}
797

798 799 800 801
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
802
	 * Race condition! In the gap, when table->tb6_lock was
803 804 805 806 807 808
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
809 810 811 812
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
813
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
814
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
815 816 817
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
Thomas Graf 已提交
818 819 820 821 822 823 824 825
	return rt;
}

struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
{
	int flags = 0;

	if (rt6_need_strict(&fl->fl6_dst))
826
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
827

828 829 830
	if (!ipv6_addr_any(&fl->fl6_src))
		flags |= RT6_LOOKUP_F_HAS_SADDR;

T
Thomas Graf 已提交
831
	return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
L
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832 833
}

834
EXPORT_SYMBOL(ip6_route_output);
L
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835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857

/*
 *	Destination cache support functions
 */

static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
{
	struct rt6_info *rt;

	rt = (struct rt6_info *) dst;

	if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
		return dst;

	return NULL;
}

static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
{
	struct rt6_info *rt = (struct rt6_info *) dst;

	if (rt) {
		if (rt->rt6i_flags & RTF_CACHE)
858
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
		else
			dst_release(dst);
	}
	return NULL;
}

static void ip6_link_failure(struct sk_buff *skb)
{
	struct rt6_info *rt;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);

	rt = (struct rt6_info *) skb->dst;
	if (rt) {
		if (rt->rt6i_flags&RTF_CACHE) {
			dst_set_expires(&rt->u.dst, 0);
			rt->rt6i_flags |= RTF_EXPIRES;
		} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
			rt->rt6i_node->fn_sernum = -1;
	}
}

static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
{
	struct rt6_info *rt6 = (struct rt6_info*)dst;

	if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
		rt6->rt6i_flags |= RTF_MODIFIED;
		if (mtu < IPV6_MIN_MTU) {
			mtu = IPV6_MIN_MTU;
			dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
		}
		dst->metrics[RTAX_MTU-1] = mtu;
892
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
L
Linus Torvalds 已提交
893 894 895 896 897 898 899 900 901 902 903 904 905
	}
}

static int ipv6_get_mtu(struct net_device *dev);

static inline unsigned int ipv6_advmss(unsigned int mtu)
{
	mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);

	if (mtu < ip6_rt_min_advmss)
		mtu = ip6_rt_min_advmss;

	/*
906 907 908
	 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
	 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
	 * IPV6_MAXPLEN is also valid and means: "any MSS,
L
Linus Torvalds 已提交
909 910 911 912 913 914 915
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

916
static struct dst_entry *ndisc_dst_gc_list;
A
Adrian Bunk 已提交
917
static DEFINE_SPINLOCK(ndisc_lock);
918

919
struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
L
Linus Torvalds 已提交
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
				  struct neighbour *neigh,
				  struct in6_addr *addr,
				  int (*output)(struct sk_buff *))
{
	struct rt6_info *rt;
	struct inet6_dev *idev = in6_dev_get(dev);

	if (unlikely(idev == NULL))
		return NULL;

	rt = ip6_dst_alloc();
	if (unlikely(rt == NULL)) {
		in6_dev_put(idev);
		goto out;
	}

	dev_hold(dev);
	if (neigh)
		neigh_hold(neigh);
	else
		neigh = ndisc_get_neigh(dev, addr);

	rt->rt6i_dev	  = dev;
	rt->rt6i_idev     = idev;
	rt->rt6i_nexthop  = neigh;
	atomic_set(&rt->u.dst.__refcnt, 1);
	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
	rt->u.dst.output  = output;

#if 0	/* there's no chance to use these for ndisc */
952 953
	rt->u.dst.flags   = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
				? DST_HOST
L
Linus Torvalds 已提交
954 955 956 957 958
				: 0;
	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
#endif

959
	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
960 961
	rt->u.dst.next = ndisc_dst_gc_list;
	ndisc_dst_gc_list = &rt->u.dst;
962
	spin_unlock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
963 964 965 966

	fib6_force_start_gc();

out:
967
	return &rt->u.dst;
L
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968 969 970 971 972 973 974 975
}

int ndisc_dst_gc(int *more)
{
	struct dst_entry *dst, *next, **pprev;
	int freed;

	next = NULL;
976
	freed = 0;
977 978

	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
979
	pprev = &ndisc_dst_gc_list;
980

L
Linus Torvalds 已提交
981 982 983 984 985 986 987 988 989 990 991
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

992 993
	spin_unlock_bh(&ndisc_lock);

L
Linus Torvalds 已提交
994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	return freed;
}

static int ip6_dst_gc(void)
{
	static unsigned expire = 30*HZ;
	static unsigned long last_gc;
	unsigned long now = jiffies;

	if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
	    atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
		goto out;

	expire++;
	fib6_run_gc(expire);
	last_gc = now;
	if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
		expire = ip6_rt_gc_timeout>>1;

out:
	expire -= expire>>ip6_rt_gc_elasticity;
	return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
}

/* Clean host part of a prefix. Not necessary in radix tree,
   but results in cleaner routing tables.

   Remove it only when all the things will work!
 */

static int ipv6_get_mtu(struct net_device *dev)
{
	int mtu = IPV6_MIN_MTU;
	struct inet6_dev *idev;

	idev = in6_dev_get(dev);
	if (idev) {
		mtu = idev->cnf.mtu6;
		in6_dev_put(idev);
	}
	return mtu;
}

int ipv6_get_hoplimit(struct net_device *dev)
{
	int hoplimit = ipv6_devconf.hop_limit;
	struct inet6_dev *idev;

	idev = in6_dev_get(dev);
	if (idev) {
		hoplimit = idev->cnf.hop_limit;
		in6_dev_put(idev);
	}
	return hoplimit;
}

/*
 *
 */

1054
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1055 1056 1057 1058 1059
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1060
	struct fib6_table *table;
L
Linus Torvalds 已提交
1061 1062
	int addr_type;

1063
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1064 1065
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1066
	if (cfg->fc_src_len)
L
Linus Torvalds 已提交
1067 1068
		return -EINVAL;
#endif
1069
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1070
		err = -ENODEV;
1071
		dev = dev_get_by_index(cfg->fc_ifindex);
L
Linus Torvalds 已提交
1072 1073 1074 1075 1076 1077 1078
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1079 1080
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1081

1082
	table = fib6_new_table(cfg->fc_table);
T
Thomas Graf 已提交
1083 1084 1085 1086 1087
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
Linus Torvalds 已提交
1088 1089 1090 1091 1092 1093 1094 1095
	rt = ip6_dst_alloc();

	if (rt == NULL) {
		err = -ENOMEM;
		goto out;
	}

	rt->u.dst.obsolete = -1;
1096
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1097

1098 1099 1100 1101 1102
	if (cfg->fc_protocol == RTPROT_UNSPEC)
		cfg->fc_protocol = RTPROT_BOOT;
	rt->rt6i_protocol = cfg->fc_protocol;

	addr_type = ipv6_addr_type(&cfg->fc_dst);
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107 1108 1109 1110

	if (addr_type & IPV6_ADDR_MULTICAST)
		rt->u.dst.input = ip6_mc_input;
	else
		rt->u.dst.input = ip6_forward;

	rt->u.dst.output = ip6_output;

1111 1112
	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
L
Linus Torvalds 已提交
1113 1114 1115 1116
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1117 1118
	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
	rt->rt6i_src.plen = cfg->fc_src_len;
L
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1119 1120
#endif

1121
	rt->rt6i_metric = cfg->fc_metric;
L
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1122 1123 1124 1125

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1126
	if ((cfg->fc_flags & RTF_REJECT) ||
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	    (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
		/* hold loopback dev/idev if we haven't done so. */
		if (dev != &loopback_dev) {
			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
			dev = &loopback_dev;
			dev_hold(dev);
			idev = in6_dev_get(dev);
			if (!idev) {
				err = -ENODEV;
				goto out;
			}
		}
		rt->u.dst.output = ip6_pkt_discard_out;
		rt->u.dst.input = ip6_pkt_discard;
		rt->u.dst.error = -ENETUNREACH;
		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
		goto install_route;
	}

1149
	if (cfg->fc_flags & RTF_GATEWAY) {
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		struct in6_addr *gw_addr;
		int gwa_type;

1153 1154
		gw_addr = &cfg->fc_gateway;
		ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
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		gwa_type = ipv6_addr_type(gw_addr);

		if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
			struct rt6_info *grt;

			/* IPv6 strictly inhibits using not link-local
			   addresses as nexthop address.
			   Otherwise, router will not able to send redirects.
			   It is very good, but in some (rare!) circumstances
			   (SIT, PtP, NBMA NOARP links) it is handy to allow
			   some exceptions. --ANK
			 */
			err = -EINVAL;
			if (!(gwa_type&IPV6_ADDR_UNICAST))
				goto out;

1171
			grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
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			err = -EHOSTUNREACH;
			if (grt == NULL)
				goto out;
			if (dev) {
				if (dev != grt->rt6i_dev) {
					dst_release(&grt->u.dst);
					goto out;
				}
			} else {
				dev = grt->rt6i_dev;
				idev = grt->rt6i_idev;
				dev_hold(dev);
				in6_dev_hold(grt->rt6i_idev);
			}
			if (!(grt->rt6i_flags&RTF_GATEWAY))
				err = 0;
			dst_release(&grt->u.dst);

			if (err)
				goto out;
		}
		err = -EINVAL;
		if (dev == NULL || (dev->flags&IFF_LOOPBACK))
			goto out;
	}

	err = -ENODEV;
	if (dev == NULL)
		goto out;

1203
	if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
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		rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
		if (IS_ERR(rt->rt6i_nexthop)) {
			err = PTR_ERR(rt->rt6i_nexthop);
			rt->rt6i_nexthop = NULL;
			goto out;
		}
	}

1212
	rt->rt6i_flags = cfg->fc_flags;
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install_route:
1215 1216 1217 1218 1219 1220 1221 1222 1223
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

		nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
			int type = nla->nla_type;

			if (type) {
				if (type > RTAX_MAX) {
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					err = -EINVAL;
					goto out;
				}
1227 1228

				rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
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			}
		}
	}

	if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
		rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
	if (!rt->u.dst.metrics[RTAX_MTU-1])
		rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
	if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
	rt->u.dst.dev = dev;
	rt->rt6i_idev = idev;
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	rt->rt6i_table = table;
1242
	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
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out:
	if (dev)
		dev_put(dev);
	if (idev)
		in6_dev_put(idev);
	if (rt)
1250
		dst_free(&rt->u.dst);
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	return err;
}

1254
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
L
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{
	int err;
T
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	struct fib6_table *table;
L
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1258

1259 1260 1261
	if (rt == &ip6_null_entry)
		return -ENOENT;

T
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	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
L
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1264

1265
	err = fib6_del(rt, info);
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	dst_release(&rt->u.dst);

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	write_unlock_bh(&table->tb6_lock);
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	return err;
}

1273 1274
int ip6_del_rt(struct rt6_info *rt)
{
1275
	return __ip6_del_rt(rt, NULL);
1276 1277
}

1278
static int ip6_route_del(struct fib6_config *cfg)
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{
T
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	struct fib6_table *table;
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1281 1282 1283 1284
	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1285
	table = fib6_get_table(cfg->fc_table);
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	if (table == NULL)
		return err;

	read_lock_bh(&table->tb6_lock);
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T
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	fn = fib6_locate(&table->tb6_root,
1292 1293
			 &cfg->fc_dst, cfg->fc_dst_len,
			 &cfg->fc_src, cfg->fc_src_len);
1294

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	if (fn) {
1296
		for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1297
			if (cfg->fc_ifindex &&
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			    (rt->rt6i_dev == NULL ||
1299
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
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				continue;
1301 1302
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
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				continue;
1304
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
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				continue;
			dst_hold(&rt->u.dst);
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			read_unlock_bh(&table->tb6_lock);
L
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1308

1309
			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
L
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1310 1311
		}
	}
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	read_unlock_bh(&table->tb6_lock);
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	return err;
}

/*
 *	Handle redirects
 */
1320 1321 1322 1323 1324 1325 1326 1327
struct ip6rd_flowi {
	struct flowi fl;
	struct in6_addr gateway;
};

static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
					     struct flowi *fl,
					     int flags)
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{
1329 1330
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1331
	struct fib6_node *fn;
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L
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	/*
1334 1335 1336 1337 1338 1339 1340 1341
	 * Get the "current" route for this destination and
	 * check if the redirect has come from approriate router.
	 *
	 * RFC 2461 specifies that redirects should only be
	 * accepted if they come from the nexthop to the target.
	 * Due to the way the routes are chosen, this notion
	 * is a bit fuzzy and one might need to check all possible
	 * routes.
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	 */

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	read_lock_bh(&table->tb6_lock);
1345
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1346
restart:
1347
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
		/*
		 * Current route is on-link; redirect is always invalid.
		 *
		 * Seems, previous statement is not true. It could
		 * be node, which looks for us as on-link (f.e. proxy ndisc)
		 * But then router serving it might decide, that we should
		 * know truth 8)8) --ANK (980726).
		 */
		if (rt6_check_expired(rt))
			continue;
		if (!(rt->rt6i_flags & RTF_GATEWAY))
			continue;
1360
		if (fl->oif != rt->rt6i_dev->ifindex)
1361
			continue;
1362
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1363 1364 1365
			continue;
		break;
	}
1366

1367
	if (!rt)
1368
		rt = &ip6_null_entry;
1369 1370
	BACKTRACK(&fl->fl6_src);
out:
1371 1372
	dst_hold(&rt->u.dst);

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	read_unlock_bh(&table->tb6_lock);
1374

1375 1376 1377 1378 1379 1380 1381 1382
	return rt;
};

static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
					   struct in6_addr *src,
					   struct in6_addr *gateway,
					   struct net_device *dev)
{
1383
	int flags = RT6_LOOKUP_F_HAS_SADDR;
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1396 1397 1398

	if (rt6_need_strict(dest))
		flags |= RT6_LOOKUP_F_IFACE;
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412

	return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect);
}

void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
		  struct in6_addr *saddr,
		  struct neighbour *neigh, u8 *lladdr, int on_link)
{
	struct rt6_info *rt, *nrt = NULL;
	struct netevent_redirect netevent;

	rt = ip6_route_redirect(dest, src, saddr, neigh->dev);

	if (rt == &ip6_null_entry) {
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		if (net_ratelimit())
			printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
			       "for redirect target\n");
1416
		goto out;
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	}

	/*
	 *	We have finally decided to accept it.
	 */

1423
	neigh_update(neigh, lladdr, NUD_STALE,
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		     NEIGH_UPDATE_F_WEAK_OVERRIDE|
		     NEIGH_UPDATE_F_OVERRIDE|
		     (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
				     NEIGH_UPDATE_F_ISROUTER))
		     );

	/*
	 * Redirect received -> path was valid.
	 * Look, redirects are sent only in response to data packets,
	 * so that this nexthop apparently is reachable. --ANK
	 */
	dst_confirm(&rt->u.dst);

	/* Duplicate redirect: silently ignore. */
	if (neigh == rt->u.dst.neighbour)
		goto out;

	nrt = ip6_rt_copy(rt);
	if (nrt == NULL)
		goto out;

	nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
	if (on_link)
		nrt->rt6i_flags &= ~RTF_GATEWAY;

	ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
	nrt->rt6i_dst.plen = 128;
	nrt->u.dst.flags |= DST_HOST;

	ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
	nrt->rt6i_nexthop = neigh_clone(neigh);
	/* Reset pmtu, it may be better */
	nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
	nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));

1459
	if (ip6_ins_rt(nrt))
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1460 1461
		goto out;

1462 1463 1464 1465
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

L
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1466
	if (rt->rt6i_flags&RTF_CACHE) {
1467
		ip6_del_rt(rt);
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1468 1469 1470 1471
		return;
	}

out:
1472
	dst_release(&rt->u.dst);
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	return;
}

/*
 *	Handle ICMP "packet too big" messages
 *	i.e. Path MTU discovery
 */

void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
			struct net_device *dev, u32 pmtu)
{
	struct rt6_info *rt, *nrt;
	int allfrag = 0;

	rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
	if (rt == NULL)
		return;

	if (pmtu >= dst_mtu(&rt->u.dst))
		goto out;

	if (pmtu < IPV6_MIN_MTU) {
		/*
1496
		 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
L
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1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
		 * MTU (1280) and a fragment header should always be included
		 * after a node receiving Too Big message reporting PMTU is
		 * less than the IPv6 Minimum Link MTU.
		 */
		pmtu = IPV6_MIN_MTU;
		allfrag = 1;
	}

	/* New mtu received -> path was valid.
	   They are sent only in response to data packets,
	   so that this nexthop apparently is reachable. --ANK
	 */
	dst_confirm(&rt->u.dst);

	/* Host route. If it is static, it would be better
	   not to override it, but add new one, so that
	   when cache entry will expire old pmtu
	   would return automatically.
	 */
	if (rt->rt6i_flags & RTF_CACHE) {
		rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
		if (allfrag)
			rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
		dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
		rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
		goto out;
	}

	/* Network route.
	   Two cases are possible:
	   1. It is connected route. Action: COW
	   2. It is gatewayed route or NONEXTHOP route. Action: clone it.
	 */
1530
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1531
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1532 1533
	else
		nrt = rt6_alloc_clone(rt, daddr);
1534

1535
	if (nrt) {
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
		nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
		if (allfrag)
			nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;

		/* According to RFC 1981, detecting PMTU increase shouldn't be
		 * happened within 5 mins, the recommended timer is 10 mins.
		 * Here this route expiration time is set to ip6_rt_mtu_expires
		 * which is 10 mins. After 10 mins the decreased pmtu is expired
		 * and detecting PMTU increase will be automatically happened.
		 */
		dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
		nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;

1549
		ip6_ins_rt(nrt);
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1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567
	}
out:
	dst_release(&rt->u.dst);
}

/*
 *	Misc support functions
 */

static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
{
	struct rt6_info *rt = ip6_dst_alloc();

	if (rt) {
		rt->u.dst.input = ort->u.dst.input;
		rt->u.dst.output = ort->u.dst.output;

		memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1568
		rt->u.dst.error = ort->u.dst.error;
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		rt->u.dst.dev = ort->u.dst.dev;
		if (rt->u.dst.dev)
			dev_hold(rt->u.dst.dev);
		rt->rt6i_idev = ort->rt6i_idev;
		if (rt->rt6i_idev)
			in6_dev_hold(rt->rt6i_idev);
		rt->u.dst.lastuse = jiffies;
		rt->rt6i_expires = 0;

		ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
		rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
		rt->rt6i_metric = 0;

		memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
#ifdef CONFIG_IPV6_SUBTREES
		memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
#endif
T
Thomas Graf 已提交
1586
		rt->rt6i_table = ort->rt6i_table;
L
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1587 1588 1589 1590
	}
	return rt;
}

1591 1592 1593 1594 1595 1596
#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex)
{
	struct fib6_node *fn;
	struct rt6_info *rt = NULL;
T
Thomas Graf 已提交
1597 1598 1599 1600 1601
	struct fib6_table *table;

	table = fib6_get_table(RT6_TABLE_INFO);
	if (table == NULL)
		return NULL;
1602

T
Thomas Graf 已提交
1603 1604
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1605 1606 1607
	if (!fn)
		goto out;

1608
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
		if (rt->rt6i_dev->ifindex != ifindex)
			continue;
		if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
			continue;
		if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
			continue;
		dst_hold(&rt->u.dst);
		break;
	}
out:
T
Thomas Graf 已提交
1619
	write_unlock_bh(&table->tb6_lock);
1620 1621 1622 1623 1624 1625 1626
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_INFO,
		.fc_metric	= 1024,
		.fc_ifindex	= ifindex,
		.fc_dst_len	= prefixlen,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
				  RTF_UP | RTF_PREF(pref),
	};

	ipv6_addr_copy(&cfg.fc_dst, prefix);
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1638

1639 1640
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1641
		cfg.fc_flags |= RTF_DEFAULT;
1642

1643
	ip6_route_add(&cfg);
1644 1645 1646 1647 1648

	return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
}
#endif

L
Linus Torvalds 已提交
1649
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1650
{
L
Linus Torvalds 已提交
1651
	struct rt6_info *rt;
T
Thomas Graf 已提交
1652
	struct fib6_table *table;
L
Linus Torvalds 已提交
1653

T
Thomas Graf 已提交
1654 1655 1656
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return NULL;
L
Linus Torvalds 已提交
1657

T
Thomas Graf 已提交
1658
	write_lock_bh(&table->tb6_lock);
1659
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1660
		if (dev == rt->rt6i_dev &&
1661
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
Linus Torvalds 已提交
1662 1663 1664 1665 1666
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
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	write_unlock_bh(&table->tb6_lock);
L
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1668 1669 1670 1671
	return rt;
}

struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1672 1673
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1674
{
1675 1676 1677 1678 1679 1680 1681
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_DFLT,
		.fc_metric	= 1024,
		.fc_ifindex	= dev->ifindex,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
	};
L
Linus Torvalds 已提交
1682

1683
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
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1684

1685
	ip6_route_add(&cfg);
L
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1686 1687 1688 1689 1690 1691 1692

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1693 1694 1695 1696 1697 1698
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return;
L
Linus Torvalds 已提交
1699 1700

restart:
T
Thomas Graf 已提交
1701
	read_lock_bh(&table->tb6_lock);
1702
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1703 1704
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1705
			read_unlock_bh(&table->tb6_lock);
1706
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1707 1708 1709
			goto restart;
		}
	}
T
Thomas Graf 已提交
1710
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1711 1712
}

1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
				 struct fib6_config *cfg)
{
	memset(cfg, 0, sizeof(*cfg));

	cfg->fc_table = RT6_TABLE_MAIN;
	cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
	cfg->fc_metric = rtmsg->rtmsg_metric;
	cfg->fc_expires = rtmsg->rtmsg_info;
	cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
	cfg->fc_src_len = rtmsg->rtmsg_src_len;
	cfg->fc_flags = rtmsg->rtmsg_flags;

	ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
	ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
	ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
}

L
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1731 1732
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
{
1733
	struct fib6_config cfg;
L
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1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745
	struct in6_rtmsg rtmsg;
	int err;

	switch(cmd) {
	case SIOCADDRT:		/* Add a route */
	case SIOCDELRT:		/* Delete a route */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		err = copy_from_user(&rtmsg, arg,
				     sizeof(struct in6_rtmsg));
		if (err)
			return -EFAULT;
1746 1747 1748

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
Linus Torvalds 已提交
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		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1752
			err = ip6_route_add(&cfg);
L
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			break;
		case SIOCDELRT:
1755
			err = ip6_route_del(&cfg);
L
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1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
	};

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

1772 1773
static inline int ip6_pkt_drop(struct sk_buff *skb, int code,
			       int ipstats_mib_noroutes)
L
Linus Torvalds 已提交
1774
{
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
	int type;
	switch (ipstats_mib_noroutes) {
	case IPSTATS_MIB_INNOROUTES:
		type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
		if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
			IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
			break;
		}
		/* FALLTHROUGH */
	case IPSTATS_MIB_OUTNOROUTES:
		IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
		break;
	}
1788
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
L
Linus Torvalds 已提交
1789 1790 1791 1792
	kfree_skb(skb);
	return 0;
}

1793 1794
static int ip6_pkt_discard(struct sk_buff *skb)
{
1795
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1796 1797
}

1798
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1799 1800
{
	skb->dev = skb->dst->dev;
1801
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
L
Linus Torvalds 已提交
1802 1803
}

1804 1805
#ifdef CONFIG_IPV6_MULTIPLE_TABLES

1806 1807
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
1808
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1809 1810 1811 1812 1813
}

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb->dst->dev;
1814
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1815 1816 1817 1818 1819 1820 1821 1822
}

static int ip6_pkt_blk_hole(struct sk_buff *skb)
{
	kfree_skb(skb);
	return 0;
}

1823 1824
#endif

L
Linus Torvalds 已提交
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851
/*
 *	Allocate a dst for local (unicast / anycast) address.
 */

struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
				    const struct in6_addr *addr,
				    int anycast)
{
	struct rt6_info *rt = ip6_dst_alloc();

	if (rt == NULL)
		return ERR_PTR(-ENOMEM);

	dev_hold(&loopback_dev);
	in6_dev_hold(idev);

	rt->u.dst.flags = DST_HOST;
	rt->u.dst.input = ip6_input;
	rt->u.dst.output = ip6_output;
	rt->rt6i_dev = &loopback_dev;
	rt->rt6i_idev = idev;
	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
	rt->u.dst.obsolete = -1;

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1852 1853 1854
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1855 1856 1857
		rt->rt6i_flags |= RTF_LOCAL;
	rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
	if (rt->rt6i_nexthop == NULL) {
1858
		dst_free(&rt->u.dst);
L
Linus Torvalds 已提交
1859 1860 1861 1862 1863
		return ERR_PTR(-ENOMEM);
	}

	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
T
Thomas Graf 已提交
1864
	rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882

	atomic_set(&rt->u.dst.__refcnt, 1);

	return rt;
}

static int fib6_ifdown(struct rt6_info *rt, void *arg)
{
	if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
	    rt != &ip6_null_entry) {
		RT6_TRACE("deleted by ifdown %p\n", rt);
		return -1;
	}
	return 0;
}

void rt6_ifdown(struct net_device *dev)
{
T
Thomas Graf 已提交
1883
	fib6_clean_all(fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
}

struct rt6_mtu_change_arg
{
	struct net_device *dev;
	unsigned mtu;
};

static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
{
	struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
	struct inet6_dev *idev;

	/* In IPv6 pmtu discovery is not optional,
	   so that RTAX_MTU lock cannot disable it.
	   We still use this lock to block changes
	   caused by addrconf/ndisc.
	*/

	idev = __in6_dev_get(arg->dev);
	if (idev == NULL)
		return 0;

	/* For administrative MTU increase, there is no way to discover
	   IPv6 PMTU increase, so PMTU increase should be updated here.
	   Since RFC 1981 doesn't include administrative MTU increase
	   update PMTU increase is a MUST. (i.e. jumbo frame)
	 */
	/*
	   If new MTU is less than route PMTU, this new MTU will be the
	   lowest MTU in the path, update the route PMTU to reflect PMTU
	   decreases; if new MTU is greater than route PMTU, and the
	   old MTU is the lowest MTU in the path, update the route PMTU
	   to reflect the increase. In this case if the other nodes' MTU
	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
	   PMTU discouvery.
	 */
	if (rt->rt6i_dev == arg->dev &&
	    !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1923 1924
	    (dst_mtu(&rt->u.dst) > arg->mtu ||
	     (dst_mtu(&rt->u.dst) < arg->mtu &&
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929 1930 1931 1932
	      dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
		rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
	return 0;
}

void rt6_mtu_change(struct net_device *dev, unsigned mtu)
{
T
Thomas Graf 已提交
1933 1934 1935 1936
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1937

T
Thomas Graf 已提交
1938
	fib6_clean_all(rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1939 1940
}

1941
static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
1942
	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
1943
	[RTA_OIF]               = { .type = NLA_U32 },
1944
	[RTA_IIF]		= { .type = NLA_U32 },
1945 1946 1947 1948 1949 1950
	[RTA_PRIORITY]          = { .type = NLA_U32 },
	[RTA_METRICS]           = { .type = NLA_NESTED },
};

static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
			      struct fib6_config *cfg)
L
Linus Torvalds 已提交
1951
{
1952 1953 1954
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1955

1956 1957 1958
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1959

1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
	err = -EINVAL;
	rtm = nlmsg_data(nlh);
	memset(cfg, 0, sizeof(*cfg));

	cfg->fc_table = rtm->rtm_table;
	cfg->fc_dst_len = rtm->rtm_dst_len;
	cfg->fc_src_len = rtm->rtm_src_len;
	cfg->fc_flags = RTF_UP;
	cfg->fc_protocol = rtm->rtm_protocol;

	if (rtm->rtm_type == RTN_UNREACHABLE)
		cfg->fc_flags |= RTF_REJECT;

	cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
	cfg->fc_nlinfo.nlh = nlh;

	if (tb[RTA_GATEWAY]) {
		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
		cfg->fc_flags |= RTF_GATEWAY;
L
Linus Torvalds 已提交
1979
	}
1980 1981 1982 1983 1984 1985 1986 1987

	if (tb[RTA_DST]) {
		int plen = (rtm->rtm_dst_len + 7) >> 3;

		if (nla_len(tb[RTA_DST]) < plen)
			goto errout;

		nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
L
Linus Torvalds 已提交
1988
	}
1989 1990 1991 1992 1993 1994 1995 1996

	if (tb[RTA_SRC]) {
		int plen = (rtm->rtm_src_len + 7) >> 3;

		if (nla_len(tb[RTA_SRC]) < plen)
			goto errout;

		nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
L
Linus Torvalds 已提交
1997
	}
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

	if (tb[RTA_OIF])
		cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);

	if (tb[RTA_PRIORITY])
		cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);

	if (tb[RTA_METRICS]) {
		cfg->fc_mx = nla_data(tb[RTA_METRICS]);
		cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
L
Linus Torvalds 已提交
2008
	}
2009 2010 2011 2012 2013 2014 2015

	if (tb[RTA_TABLE])
		cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
2016 2017 2018 2019
}

int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
2020 2021
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2022

2023 2024 2025 2026 2027
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
2028 2029 2030 2031
}

int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
2032 2033
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2034

2035 2036 2037 2038 2039
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
2040 2041
}

2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
static inline size_t rt6_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct rtmsg))
	       + nla_total_size(16) /* RTA_SRC */
	       + nla_total_size(16) /* RTA_DST */
	       + nla_total_size(16) /* RTA_GATEWAY */
	       + nla_total_size(16) /* RTA_PREFSRC */
	       + nla_total_size(4) /* RTA_TABLE */
	       + nla_total_size(4) /* RTA_IIF */
	       + nla_total_size(4) /* RTA_OIF */
	       + nla_total_size(4) /* RTA_PRIORITY */
2053
	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2054 2055 2056
	       + nla_total_size(sizeof(struct rta_cacheinfo));
}

L
Linus Torvalds 已提交
2057
static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2058 2059 2060
			 struct in6_addr *dst, struct in6_addr *src,
			 int iif, int type, u32 pid, u32 seq,
			 int prefix, unsigned int flags)
L
Linus Torvalds 已提交
2061 2062
{
	struct rtmsg *rtm;
2063
	struct nlmsghdr *nlh;
2064
	long expires;
2065
	u32 table;
L
Linus Torvalds 已提交
2066 2067 2068 2069 2070 2071 2072 2073

	if (prefix) {	/* user wants prefix routes only */
		if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
			/* success since this is not a prefix route */
			return 1;
		}
	}

2074 2075
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
	if (nlh == NULL)
2076
		return -EMSGSIZE;
2077 2078

	rtm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
2079 2080 2081 2082
	rtm->rtm_family = AF_INET6;
	rtm->rtm_dst_len = rt->rt6i_dst.plen;
	rtm->rtm_src_len = rt->rt6i_src.plen;
	rtm->rtm_tos = 0;
T
Thomas Graf 已提交
2083
	if (rt->rt6i_table)
2084
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
2085
	else
2086 2087
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2088
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
	if (rt->rt6i_flags&RTF_REJECT)
		rtm->rtm_type = RTN_UNREACHABLE;
	else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
		rtm->rtm_type = RTN_LOCAL;
	else
		rtm->rtm_type = RTN_UNICAST;
	rtm->rtm_flags = 0;
	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
	rtm->rtm_protocol = rt->rt6i_protocol;
	if (rt->rt6i_flags&RTF_DYNAMIC)
		rtm->rtm_protocol = RTPROT_REDIRECT;
	else if (rt->rt6i_flags & RTF_ADDRCONF)
		rtm->rtm_protocol = RTPROT_KERNEL;
	else if (rt->rt6i_flags&RTF_DEFAULT)
		rtm->rtm_protocol = RTPROT_RA;

	if (rt->rt6i_flags&RTF_CACHE)
		rtm->rtm_flags |= RTM_F_CLONED;

	if (dst) {
2109
		NLA_PUT(skb, RTA_DST, 16, dst);
2110
		rtm->rtm_dst_len = 128;
L
Linus Torvalds 已提交
2111
	} else if (rtm->rtm_dst_len)
2112
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2113 2114
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2115
		NLA_PUT(skb, RTA_SRC, 16, src);
2116
		rtm->rtm_src_len = 128;
L
Linus Torvalds 已提交
2117
	} else if (rtm->rtm_src_len)
2118
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2119 2120
#endif
	if (iif)
2121
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
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2122 2123 2124
	else if (dst) {
		struct in6_addr saddr_buf;
		if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2125
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2126
	}
2127

L
Linus Torvalds 已提交
2128
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2129 2130
		goto nla_put_failure;

L
Linus Torvalds 已提交
2131
	if (rt->u.dst.neighbour)
2132 2133
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2134
	if (rt->u.dst.dev)
2135 2136 2137
		NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);

	NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2138 2139 2140 2141 2142

	expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
	if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
			       expires, rt->u.dst.error) < 0)
		goto nla_put_failure;
2143 2144 2145 2146

	return nlmsg_end(skb, nlh);

nla_put_failure:
2147 2148
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
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}

2151
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
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2152 2153 2154 2155
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2156 2157
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
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		prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
	} else
		prefix = 0;

	return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
		     NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2164
		     prefix, NLM_F_MULTI);
L
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2165 2166 2167 2168
}

int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
{
2169 2170
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
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2171
	struct sk_buff *skb;
2172
	struct rtmsg *rtm;
L
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2173
	struct flowi fl;
2174
	int err, iif = 0;
L
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2175

2176 2177 2178
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
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2180
	err = -EINVAL;
L
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	memset(&fl, 0, sizeof(fl));

2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201
	if (tb[RTA_SRC]) {
		if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
			goto errout;

		ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
	}

	if (tb[RTA_DST]) {
		if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
			goto errout;

		ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
	}

	if (tb[RTA_IIF])
		iif = nla_get_u32(tb[RTA_IIF]);

	if (tb[RTA_OIF])
		fl.oif = nla_get_u32(tb[RTA_OIF]);
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	if (iif) {
		struct net_device *dev;
		dev = __dev_get_by_index(iif);
		if (!dev) {
			err = -ENODEV;
2208
			goto errout;
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		}
	}

2212 2213 2214 2215 2216
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
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2218 2219 2220 2221 2222
	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
	skb->mac.raw = skb->data;
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
L
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2224
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
L
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	skb->dst = &rt->u.dst;

2227
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
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			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2229
			    nlh->nlmsg_seq, 0, 0);
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	if (err < 0) {
2231 2232
		kfree_skb(skb);
		goto errout;
L
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	}

2235
	err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2236
errout:
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	return err;
}

2240
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
L
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{
	struct sk_buff *skb;
2243 2244
	u32 pid = 0, seq = 0;
	struct nlmsghdr *nlh = NULL;
2245 2246
	int err = -ENOBUFS;

2247 2248 2249 2250 2251 2252 2253
	if (info) {
		pid = info->pid;
		nlh = info->nlh;
		if (nlh)
			seq = nlh->nlmsg_seq;
	}

2254
	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2255 2256 2257 2258
	if (skb == NULL)
		goto errout;

	err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2259 2260 2261 2262 2263 2264
	if (err < 0) {
		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
2265 2266 2267 2268
	err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
errout:
	if (err < 0)
		rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
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}

/*
 *	/proc
 */

#ifdef CONFIG_PROC_FS

#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)

struct rt6_proc_arg
{
	char *buffer;
	int offset;
	int length;
	int skip;
	int len;
};

static int rt6_info_route(struct rt6_info *rt, void *p_arg)
{
	struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;

	if (arg->skip < arg->offset / RT6_INFO_LEN) {
		arg->skip++;
		return 0;
	}

	if (arg->len >= arg->length)
		return 0;

2300 2301 2302
	arg->len += sprintf(arg->buffer + arg->len,
			    NIP6_SEQFMT " %02x ",
			    NIP6(rt->rt6i_dst.addr),
L
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			    rt->rt6i_dst.plen);

#ifdef CONFIG_IPV6_SUBTREES
2306 2307 2308
	arg->len += sprintf(arg->buffer + arg->len,
			    NIP6_SEQFMT " %02x ",
			    NIP6(rt->rt6i_src.addr),
L
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			    rt->rt6i_src.plen);
#else
2311 2312
	arg->len += sprintf(arg->buffer + arg->len,
			    "00000000000000000000000000000000 00 ");
L
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2313 2314 2315
#endif

	if (rt->rt6i_nexthop) {
2316 2317 2318
		arg->len += sprintf(arg->buffer + arg->len,
				    NIP6_SEQFMT,
				    NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
L
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2319
	} else {
2320 2321
		arg->len += sprintf(arg->buffer + arg->len,
				    "00000000000000000000000000000000");
L
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2322 2323 2324 2325
	}
	arg->len += sprintf(arg->buffer + arg->len,
			    " %08x %08x %08x %08x %8s\n",
			    rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2326
			    rt->u.dst.__use, rt->rt6i_flags,
L
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			    rt->rt6i_dev ? rt->rt6i_dev->name : "");
	return 0;
}

static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
{
T
Thomas Graf 已提交
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	struct rt6_proc_arg arg = {
		.buffer = buffer,
		.offset = offset,
		.length = length,
	};
L
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T
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2339
	fib6_clean_all(rt6_info_route, 0, &arg);
L
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	*start = buffer;
	if (offset)
		*start += offset % RT6_INFO_LEN;

	arg.len -= offset % RT6_INFO_LEN;

	if (arg.len > length)
		arg.len = length;
	if (arg.len < 0)
		arg.len = 0;

	return arg.len;
}

static int rt6_stats_seq_show(struct seq_file *seq, void *v)
{
	seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
		      rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
		      rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
		      rt6_stats.fib_rt_cache,
		      atomic_read(&ip6_dst_ops.entries),
		      rt6_stats.fib_discarded_routes);

	return 0;
}

static int rt6_stats_seq_open(struct inode *inode, struct file *file)
{
	return single_open(file, rt6_stats_seq_show, NULL);
}

2372
static const struct file_operations rt6_stats_seq_fops = {
L
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	.owner	 = THIS_MODULE,
	.open	 = rt6_stats_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = single_release,
};
#endif	/* CONFIG_PROC_FS */

#ifdef CONFIG_SYSCTL

static int flush_delay;

static
int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
			      void __user *buffer, size_t *lenp, loff_t *ppos)
{
	if (write) {
		proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
		fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
		return 0;
	} else
		return -EINVAL;
}

ctl_table ipv6_route_table[] = {
2398 2399
	{
		.ctl_name	=	NET_IPV6_ROUTE_FLUSH,
L
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2400
		.procname	=	"flush",
2401
		.data		=	&flush_delay,
L
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2402
		.maxlen		=	sizeof(int),
2403
		.mode		=	0200,
2404
		.proc_handler	=	&ipv6_sysctl_rtcache_flush
L
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2405 2406 2407 2408
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_THRESH,
		.procname	=	"gc_thresh",
2409
		.data		=	&ip6_dst_ops.gc_thresh,
L
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2410 2411
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2412
		.proc_handler	=	&proc_dointvec,
L
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2413 2414 2415 2416
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MAX_SIZE,
		.procname	=	"max_size",
2417
		.data		=	&ip6_rt_max_size,
L
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2418 2419
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2420
		.proc_handler	=	&proc_dointvec,
L
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2421 2422 2423 2424
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL,
		.procname	=	"gc_min_interval",
2425
		.data		=	&ip6_rt_gc_min_interval,
L
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2426 2427
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2428
		.proc_handler	=	&proc_dointvec_jiffies,
L
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2429 2430 2431 2432 2433
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_TIMEOUT,
		.procname	=	"gc_timeout",
2434
		.data		=	&ip6_rt_gc_timeout,
L
Linus Torvalds 已提交
2435 2436
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2437
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2438 2439 2440 2441 2442
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_INTERVAL,
		.procname	=	"gc_interval",
2443
		.data		=	&ip6_rt_gc_interval,
L
Linus Torvalds 已提交
2444 2445
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2446
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2447 2448 2449 2450 2451
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_ELASTICITY,
		.procname	=	"gc_elasticity",
2452
		.data		=	&ip6_rt_gc_elasticity,
L
Linus Torvalds 已提交
2453 2454
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2455
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2456 2457 2458 2459 2460
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MTU_EXPIRES,
		.procname	=	"mtu_expires",
2461
		.data		=	&ip6_rt_mtu_expires,
L
Linus Torvalds 已提交
2462 2463
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2464
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2465 2466 2467 2468 2469
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MIN_ADVMSS,
		.procname	=	"min_adv_mss",
2470
		.data		=	&ip6_rt_min_advmss,
L
Linus Torvalds 已提交
2471 2472
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2473
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2474 2475 2476 2477 2478
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
		.procname	=	"gc_min_interval_ms",
2479
		.data		=	&ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2480 2481
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2482
		.proc_handler	=	&proc_dointvec_ms_jiffies,
L
Linus Torvalds 已提交
2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493
		.strategy	=	&sysctl_ms_jiffies,
	},
	{ .ctl_name = 0 }
};

#endif

void __init ip6_route_init(void)
{
	struct proc_dir_entry *p;

A
Alexey Dobriyan 已提交
2494 2495 2496
	ip6_dst_ops.kmem_cachep =
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
				  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
L
Linus Torvalds 已提交
2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507
	fib6_init();
#ifdef 	CONFIG_PROC_FS
	p = proc_net_create("ipv6_route", 0, rt6_proc_info);
	if (p)
		p->owner = THIS_MODULE;

	proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
#endif
#ifdef CONFIG_XFRM
	xfrm6_init();
#endif
T
Thomas Graf 已提交
2508 2509 2510
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_init();
#endif
L
Linus Torvalds 已提交
2511 2512 2513 2514
}

void ip6_route_cleanup(void)
{
T
Thomas Graf 已提交
2515 2516 2517
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_cleanup();
#endif
L
Linus Torvalds 已提交
2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
#ifdef CONFIG_PROC_FS
	proc_net_remove("ipv6_route");
	proc_net_remove("rt6_stats");
#endif
#ifdef CONFIG_XFRM
	xfrm6_fini();
#endif
	rt6_ifdown(NULL);
	fib6_gc_cleanup();
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
}