route.c 58.7 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>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <net/net_namespace.h>
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#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,
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	.local_out		=	ip6_local_out,
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	.entry_size		=	sizeof(struct rt6_info),
};

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static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
{
}

static struct dst_ops ip6_dst_blackhole_ops = {
	.family			=	AF_INET6,
	.protocol		=	__constant_htons(ETH_P_IPV6),
	.destroy		=	ip6_dst_destroy,
	.check			=	ip6_dst_check,
	.update_pmtu		=	ip6_rt_blackhole_update_pmtu,
	.entry_size		=	sizeof(struct rt6_info),
};

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struct rt6_info ip6_null_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.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);

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struct rt6_info ip6_prohibit_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.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,
			.obsolete	= -1,
			.error		= -EINVAL,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
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			.input		= dst_discard,
			.output		= dst_discard,
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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;
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	struct net_device *loopback_dev =
		dev->nd_net->loopback_dev;
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	if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
		struct inet6_dev *loopback_idev =
			in6_dev_get(loopback_dev);
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		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;
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	int m;
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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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#ifdef CONFIG_IPV6_ROUTER_PREF
		else if (neigh->nud_state & NUD_FAILED)
			m = 0;
#endif
		else
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			m = 1;
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		read_unlock_bh(&neigh->lock);
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	} else
		m = 0;
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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_use(&rt->u.dst, jiffies);
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	read_unlock_bh(&table->tb6_lock);
	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;
	}

T
Thomas Graf 已提交
580 581 582 583 584 585
	dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
	if (dst->error == 0)
		return (struct rt6_info *) dst;

	dst_release(dst);

L
Linus Torvalds 已提交
586 587 588
	return NULL;
}

589 590
EXPORT_SYMBOL(rt6_lookup);

T
Thomas Graf 已提交
591
/* ip6_ins_rt is called with FREE table->tb6_lock.
L
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592 593 594 595 596
   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.
 */

597
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
598 599
{
	int err;
T
Thomas Graf 已提交
600
	struct fib6_table *table;
L
Linus Torvalds 已提交
601

T
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602 603
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
604
	err = fib6_add(&table->tb6_root, rt, info);
T
Thomas Graf 已提交
605
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
606 607 608 609

	return err;
}

610 611
int ip6_ins_rt(struct rt6_info *rt)
{
612
	return __ip6_ins_rt(rt, NULL);
613 614
}

615 616
static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
				      struct in6_addr *saddr)
L
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{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
627 628 629 630
		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
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631
			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
632
		}
L
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633

634
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
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		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);

648
	}
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650 651
	return rt;
}
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653 654 655 656 657 658 659 660 661 662 663 664 665
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;
}

666
static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif,
A
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					    struct flowi *fl, int flags)
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{
	struct fib6_node *fn;
670
	struct rt6_info *rt, *nrt;
T
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	int strict = 0;
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	int attempts = 3;
673
	int err;
674
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
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676
	strict |= flags & RT6_LOOKUP_F_IFACE;
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relookup:
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679
	read_lock_bh(&table->tb6_lock);
L
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680

681
restart_2:
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682
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
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restart:
685
	rt = rt6_select(fn, oif, strict | reachable);
686
	BACKTRACK(&fl->fl6_src);
687 688
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
689
		goto out;
L
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690

691
	dst_hold(&rt->u.dst);
T
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692
	read_unlock_bh(&table->tb6_lock);
693

694
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
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		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
696 697
	else {
#if CLONE_OFFLINK_ROUTE
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		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
699 700 701 702
#else
		goto out2;
#endif
	}
703

704 705
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
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707 708
	dst_hold(&rt->u.dst);
	if (nrt) {
709
		err = ip6_ins_rt(nrt);
710
		if (!err)
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			goto out2;
	}

714 715 716 717
	if (--attempts <= 0)
		goto out2;

	/*
T
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	 * Race condition! In the gap, when table->tb6_lock was
719 720 721 722 723 724
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
725 726 727 728
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
729
	dst_hold(&rt->u.dst);
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730
	read_unlock_bh(&table->tb6_lock);
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out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
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	return rt;
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}

738 739 740 741 742 743
static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
{
	return ip6_pol_route(table, fl->iif, fl, flags);
}

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void ip6_route_input(struct sk_buff *skb)
{
746
	struct ipv6hdr *iph = ipv6_hdr(skb);
747
	int flags = RT6_LOOKUP_F_HAS_SADDR;
T
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	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
A
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				.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
T
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			},
		},
757
		.mark = skb->mark,
T
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		.proto = iph->nexthdr,
	};
760 761 762

	if (rt6_need_strict(&iph->daddr))
		flags |= RT6_LOOKUP_F_IFACE;
T
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	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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769
{
770
	return ip6_pol_route(table, fl->oif, fl, flags);
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}

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

	if (rt6_need_strict(&fl->fl6_dst))
778
		flags |= RT6_LOOKUP_F_IFACE;
T
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779

780 781 782
	if (!ipv6_addr_any(&fl->fl6_src))
		flags |= RT6_LOOKUP_F_HAS_SADDR;

T
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	return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
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784 785
}

786
EXPORT_SYMBOL(ip6_route_output);
L
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787

788 789 790 791 792 793 794 795 796 797 798 799
int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
{
	struct rt6_info *ort = (struct rt6_info *) *dstp;
	struct rt6_info *rt = (struct rt6_info *)
		dst_alloc(&ip6_dst_blackhole_ops);
	struct dst_entry *new = NULL;

	if (rt) {
		new = &rt->u.dst;

		atomic_set(&new->__refcnt, 1);
		new->__use = 1;
800 801
		new->input = dst_discard;
		new->output = dst_discard;
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829

		memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
		new->dev = ort->u.dst.dev;
		if (new->dev)
			dev_hold(new->dev);
		rt->rt6i_idev = ort->rt6i_idev;
		if (rt->rt6i_idev)
			in6_dev_hold(rt->rt6i_idev);
		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

		dst_free(new);
	}

	dst_release(*dstp);
	*dstp = new;
	return (new ? 0 : -ENOMEM);
}
EXPORT_SYMBOL_GPL(ip6_dst_blackhole);

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830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
/*
 *	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)
852
			ip6_del_rt(rt);
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		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;
886
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
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Linus Torvalds 已提交
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	}
}

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;

	/*
900 901 902
	 * 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
903 904 905 906 907 908 909
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

910
static struct dst_entry *ndisc_dst_gc_list;
A
Adrian Bunk 已提交
911
static DEFINE_SPINLOCK(ndisc_lock);
912

913
struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
L
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914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
				  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 */
946 947
	rt->u.dst.flags   = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
				? DST_HOST
L
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948 949 950 951 952
				: 0;
	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
#endif

953
	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
954 955
	rt->u.dst.next = ndisc_dst_gc_list;
	ndisc_dst_gc_list = &rt->u.dst;
956
	spin_unlock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
957 958 959 960

	fib6_force_start_gc();

out:
961
	return &rt->u.dst;
L
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962 963 964 965 966 967 968 969
}

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

	next = NULL;
970
	freed = 0;
971 972

	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
973
	pprev = &ndisc_dst_gc_list;
974

L
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975 976 977 978 979 980 981 982 983 984 985
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

986 987
	spin_unlock_bh(&ndisc_lock);

L
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988 989 990 991 992 993 994 995 996 997 998 999 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
	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;
}

/*
 *
 */

1048
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1049 1050 1051 1052 1053
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1054
	struct fib6_table *table;
L
Linus Torvalds 已提交
1055 1056
	int addr_type;

1057
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1058 1059
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1060
	if (cfg->fc_src_len)
L
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1061 1062
		return -EINVAL;
#endif
1063
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1064
		err = -ENODEV;
1065
		dev = dev_get_by_index(&init_net, cfg->fc_ifindex);
L
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1066 1067 1068 1069 1070 1071 1072
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1073 1074
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1075

1076
	table = fib6_new_table(cfg->fc_table);
T
Thomas Graf 已提交
1077 1078 1079 1080 1081
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
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1082 1083 1084 1085 1086 1087 1088 1089
	rt = ip6_dst_alloc();

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

	rt->u.dst.obsolete = -1;
1090
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1091

1092 1093 1094 1095 1096
	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
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1097 1098 1099 1100 1101 1102 1103 1104

	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;

1105 1106
	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
L
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1107 1108 1109 1110
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1111 1112
	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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1113 1114
#endif

1115
	rt->rt6i_metric = cfg->fc_metric;
L
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1116 1117 1118 1119

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1120
	if ((cfg->fc_flags & RTF_REJECT) ||
L
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1121 1122
	    (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
		/* hold loopback dev/idev if we haven't done so. */
1123
		if (dev != init_net.loopback_dev) {
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			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
1128
			dev = init_net.loopback_dev;
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			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;
	}

1143
	if (cfg->fc_flags & RTF_GATEWAY) {
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		struct in6_addr *gw_addr;
		int gwa_type;

1147 1148
		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;

1165
			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;

1197
	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;
		}
	}

1206
	rt->rt6i_flags = cfg->fc_flags;
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install_route:
1209 1210 1211 1212 1213
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

		nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1214
			int type = nla_type(nla);
1215 1216 1217

			if (type) {
				if (type > RTAX_MAX) {
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					err = -EINVAL;
					goto out;
				}
1221 1222

				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;
1236
	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)
1244
		dst_free(&rt->u.dst);
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	return err;
}

1248
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
L
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1249 1250
{
	int err;
T
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	struct fib6_table *table;
L
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1252

1253 1254 1255
	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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1258

1259
	err = fib6_del(rt, info);
L
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	dst_release(&rt->u.dst);

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

1267 1268
int ip6_del_rt(struct rt6_info *rt)
{
1269
	return __ip6_del_rt(rt, NULL);
1270 1271
}

1272
static int ip6_route_del(struct fib6_config *cfg)
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1273
{
T
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	struct fib6_table *table;
L
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1275 1276 1277 1278
	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1279
	table = fib6_get_table(cfg->fc_table);
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1280 1281 1282 1283
	if (table == NULL)
		return err;

	read_lock_bh(&table->tb6_lock);
L
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1284

T
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1285
	fn = fib6_locate(&table->tb6_root,
1286 1287
			 &cfg->fc_dst, cfg->fc_dst_len,
			 &cfg->fc_src, cfg->fc_src_len);
1288

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1289
	if (fn) {
1290
		for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1291
			if (cfg->fc_ifindex &&
L
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			    (rt->rt6i_dev == NULL ||
1293
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
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1294
				continue;
1295 1296
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
L
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				continue;
1298
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
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1299 1300
				continue;
			dst_hold(&rt->u.dst);
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1301
			read_unlock_bh(&table->tb6_lock);
L
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1302

1303
			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
L
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1304 1305
		}
	}
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1306
	read_unlock_bh(&table->tb6_lock);
L
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	return err;
}

/*
 *	Handle redirects
 */
1314 1315 1316 1317 1318 1319 1320 1321
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)
L
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{
1323 1324
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1325
	struct fib6_node *fn;
T
Thomas Graf 已提交
1326

L
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1327
	/*
1328 1329 1330 1331 1332 1333 1334 1335
	 * 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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	 */

T
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1338
	read_lock_bh(&table->tb6_lock);
1339
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1340
restart:
1341
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
		/*
		 * 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;
1354
		if (fl->oif != rt->rt6i_dev->ifindex)
1355
			continue;
1356
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1357 1358 1359
			continue;
		break;
	}
1360

1361
	if (!rt)
1362
		rt = &ip6_null_entry;
1363 1364
	BACKTRACK(&fl->fl6_src);
out:
1365 1366
	dst_hold(&rt->u.dst);

T
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1367
	read_unlock_bh(&table->tb6_lock);
1368

1369 1370 1371 1372 1373 1374 1375 1376
	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)
{
1377
	int flags = RT6_LOOKUP_F_HAS_SADDR;
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1390 1391 1392

	if (rt6_need_strict(dest))
		flags |= RT6_LOOKUP_F_IFACE;
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406

	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");
1410
		goto out;
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1411 1412 1413 1414 1415 1416
	}

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

1417
	neigh_update(neigh, lladdr, NUD_STALE,
L
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1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
		     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));

1453
	if (ip6_ins_rt(nrt))
L
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1454 1455
		goto out;

1456 1457 1458 1459
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

L
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1460
	if (rt->rt6i_flags&RTF_CACHE) {
1461
		ip6_del_rt(rt);
L
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1462 1463 1464 1465
		return;
	}

out:
1466
	dst_release(&rt->u.dst);
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1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
	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) {
		/*
1490
		 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
L
Linus Torvalds 已提交
1491 1492 1493 1494 1495 1496 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
		 * 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.
	 */
1524
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1525
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1526 1527
	else
		nrt = rt6_alloc_clone(rt, daddr);
1528

1529
	if (nrt) {
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
		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;

1543
		ip6_ins_rt(nrt);
L
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1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561
	}
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));
1562
		rt->u.dst.error = ort->u.dst.error;
L
Linus Torvalds 已提交
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
		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
1580
		rt->rt6i_table = ort->rt6i_table;
L
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1581 1582 1583 1584
	}
	return rt;
}

1585 1586 1587 1588 1589 1590
#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
1591 1592 1593 1594 1595
	struct fib6_table *table;

	table = fib6_get_table(RT6_TABLE_INFO);
	if (table == NULL)
		return NULL;
1596

T
Thomas Graf 已提交
1597 1598
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1599 1600 1601
	if (!fn)
		goto out;

1602
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
		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
1613
	write_unlock_bh(&table->tb6_lock);
1614 1615 1616 1617 1618 1619 1620
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
	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);
1632

1633 1634
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1635
		cfg.fc_flags |= RTF_DEFAULT;
1636

1637
	ip6_route_add(&cfg);
1638 1639 1640 1641 1642

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

L
Linus Torvalds 已提交
1643
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1644
{
L
Linus Torvalds 已提交
1645
	struct rt6_info *rt;
T
Thomas Graf 已提交
1646
	struct fib6_table *table;
L
Linus Torvalds 已提交
1647

T
Thomas Graf 已提交
1648 1649 1650
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return NULL;
L
Linus Torvalds 已提交
1651

T
Thomas Graf 已提交
1652
	write_lock_bh(&table->tb6_lock);
1653
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1654
		if (dev == rt->rt6i_dev &&
1655
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
Linus Torvalds 已提交
1656 1657 1658 1659 1660
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1661
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1662 1663 1664
	return rt;
}

F
Fred L. Templin 已提交
1665 1666
EXPORT_SYMBOL(rt6_get_dflt_router);

L
Linus Torvalds 已提交
1667
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1668 1669
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1670
{
1671 1672 1673 1674 1675 1676 1677
	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
1678

1679
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
Linus Torvalds 已提交
1680

1681
	ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1682 1683 1684 1685 1686 1687 1688

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1689 1690 1691 1692 1693 1694
	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
1695 1696

restart:
T
Thomas Graf 已提交
1697
	read_lock_bh(&table->tb6_lock);
1698
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1699 1700
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1701
			read_unlock_bh(&table->tb6_lock);
1702
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1703 1704 1705
			goto restart;
		}
	}
T
Thomas Graf 已提交
1706
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1707 1708
}

1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
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
Linus Torvalds 已提交
1727 1728
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
{
1729
	struct fib6_config cfg;
L
Linus Torvalds 已提交
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
	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;
1742 1743 1744

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
Linus Torvalds 已提交
1745 1746 1747
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1748
			err = ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1749 1750
			break;
		case SIOCDELRT:
1751
			err = ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1752 1753 1754 1755 1756 1757 1758
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
1759
	}
L
Linus Torvalds 已提交
1760 1761 1762 1763 1764 1765 1766 1767

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

1768 1769
static inline int ip6_pkt_drop(struct sk_buff *skb, int code,
			       int ipstats_mib_noroutes)
L
Linus Torvalds 已提交
1770
{
1771 1772 1773
	int type;
	switch (ipstats_mib_noroutes) {
	case IPSTATS_MIB_INNOROUTES:
1774
		type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1775 1776 1777 1778 1779 1780 1781 1782 1783
		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;
	}
1784
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
L
Linus Torvalds 已提交
1785 1786 1787 1788
	kfree_skb(skb);
	return 0;
}

1789 1790
static int ip6_pkt_discard(struct sk_buff *skb)
{
1791
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1792 1793
}

1794
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1795 1796
{
	skb->dev = skb->dst->dev;
1797
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
L
Linus Torvalds 已提交
1798 1799
}

1800 1801
#ifdef CONFIG_IPV6_MULTIPLE_TABLES

1802 1803
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
1804
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1805 1806 1807 1808 1809
}

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb->dst->dev;
1810
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1811 1812
}

1813 1814
#endif

L
Linus Torvalds 已提交
1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
/*
 *	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);

1828
	dev_hold(init_net.loopback_dev);
L
Linus Torvalds 已提交
1829 1830 1831 1832 1833
	in6_dev_hold(idev);

	rt->u.dst.flags = DST_HOST;
	rt->u.dst.input = ip6_input;
	rt->u.dst.output = ip6_output;
1834
	rt->rt6i_dev = init_net.loopback_dev;
L
Linus Torvalds 已提交
1835 1836 1837 1838 1839 1840 1841
	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;
1842 1843 1844
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1845 1846 1847
		rt->rt6i_flags |= RTF_LOCAL;
	rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
	if (rt->rt6i_nexthop == NULL) {
1848
		dst_free(&rt->u.dst);
L
Linus Torvalds 已提交
1849 1850 1851 1852 1853
		return ERR_PTR(-ENOMEM);
	}

	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
T
Thomas Graf 已提交
1854
	rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872

	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
1873
	fib6_clean_all(fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 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
}

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) &&
1913 1914
	    (dst_mtu(&rt->u.dst) > arg->mtu ||
	     (dst_mtu(&rt->u.dst) < arg->mtu &&
1915
	      dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
L
Linus Torvalds 已提交
1916
		rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1917 1918
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
	}
L
Linus Torvalds 已提交
1919 1920 1921 1922 1923
	return 0;
}

void rt6_mtu_change(struct net_device *dev, unsigned mtu)
{
T
Thomas Graf 已提交
1924 1925 1926 1927
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1928

T
Thomas Graf 已提交
1929
	fib6_clean_all(rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1930 1931
}

1932
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
1933
	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
1934
	[RTA_OIF]               = { .type = NLA_U32 },
1935
	[RTA_IIF]		= { .type = NLA_U32 },
1936 1937 1938 1939 1940 1941
	[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
1942
{
1943 1944 1945
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1946

1947 1948 1949
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1950

1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
	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
1970
	}
1971 1972 1973 1974 1975 1976 1977 1978

	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
1979
	}
1980 1981 1982 1983 1984 1985 1986 1987

	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
1988
	}
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998

	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
1999
	}
2000 2001 2002 2003 2004 2005 2006

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
2007 2008
}

2009
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2010
{
2011
	struct net *net = skb->sk->sk_net;
2012 2013
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2014

2015 2016 2017
	if (net != &init_net)
		return -EINVAL;

2018 2019 2020 2021 2022
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
2023 2024
}

2025
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2026
{
2027
	struct net *net = skb->sk->sk_net;
2028 2029
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2030

2031 2032 2033
	if (net != &init_net)
		return -EINVAL;

2034 2035 2036 2037 2038
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
2039 2040
}

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
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 */
2052
	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2053 2054 2055
	       + nla_total_size(sizeof(struct rta_cacheinfo));
}

L
Linus Torvalds 已提交
2056
static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2057 2058 2059
			 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
2060 2061
{
	struct rtmsg *rtm;
2062
	struct nlmsghdr *nlh;
2063
	long expires;
2064
	u32 table;
L
Linus Torvalds 已提交
2065 2066 2067 2068 2069 2070 2071 2072

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

2073 2074
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
	if (nlh == NULL)
2075
		return -EMSGSIZE;
2076 2077

	rtm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
2078 2079 2080 2081
	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
2082
	if (rt->rt6i_table)
2083
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
2084
	else
2085 2086
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2087
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
	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) {
2108
		NLA_PUT(skb, RTA_DST, 16, dst);
2109
		rtm->rtm_dst_len = 128;
L
Linus Torvalds 已提交
2110
	} else if (rtm->rtm_dst_len)
2111
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2112 2113
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2114
		NLA_PUT(skb, RTA_SRC, 16, src);
2115
		rtm->rtm_src_len = 128;
L
Linus Torvalds 已提交
2116
	} else if (rtm->rtm_src_len)
2117
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2118 2119
#endif
	if (iif)
2120
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
Linus Torvalds 已提交
2121 2122 2123
	else if (dst) {
		struct in6_addr saddr_buf;
		if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2124
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2125
	}
2126

L
Linus Torvalds 已提交
2127
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2128 2129
		goto nla_put_failure;

L
Linus Torvalds 已提交
2130
	if (rt->u.dst.neighbour)
2131 2132
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2133
	if (rt->u.dst.dev)
2134 2135 2136
		NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);

	NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2137 2138 2139 2140 2141

	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;
2142 2143 2144 2145

	return nlmsg_end(skb, nlh);

nla_put_failure:
2146 2147
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
2148 2149
}

2150
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2151 2152 2153 2154
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2155 2156
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2157 2158 2159 2160 2161 2162
		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,
2163
		     prefix, NLM_F_MULTI);
L
Linus Torvalds 已提交
2164 2165
}

2166
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2167
{
2168
	struct net *net = in_skb->sk->sk_net;
2169 2170
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
Linus Torvalds 已提交
2171
	struct sk_buff *skb;
2172
	struct rtmsg *rtm;
L
Linus Torvalds 已提交
2173
	struct flowi fl;
2174
	int err, iif = 0;
L
Linus Torvalds 已提交
2175

2176 2177 2178
	if (net != &init_net)
		return -EINVAL;

2179 2180 2181
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2182

2183
	err = -EINVAL;
L
Linus Torvalds 已提交
2184 2185
	memset(&fl, 0, sizeof(fl));

2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204
	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]);
L
Linus Torvalds 已提交
2205 2206 2207

	if (iif) {
		struct net_device *dev;
2208
		dev = __dev_get_by_index(&init_net, iif);
L
Linus Torvalds 已提交
2209 2210
		if (!dev) {
			err = -ENODEV;
2211
			goto errout;
L
Linus Torvalds 已提交
2212 2213 2214
		}
	}

2215 2216 2217 2218 2219
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
L
Linus Torvalds 已提交
2220

2221 2222 2223
	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
2224
	skb_reset_mac_header(skb);
2225
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
L
Linus Torvalds 已提交
2226

2227
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
L
Linus Torvalds 已提交
2228 2229
	skb->dst = &rt->u.dst;

2230
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
Linus Torvalds 已提交
2231
			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2232
			    nlh->nlmsg_seq, 0, 0);
L
Linus Torvalds 已提交
2233
	if (err < 0) {
2234 2235
		kfree_skb(skb);
		goto errout;
L
Linus Torvalds 已提交
2236 2237
	}

2238
	err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
2239
errout:
L
Linus Torvalds 已提交
2240 2241 2242
	return err;
}

2243
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
2244 2245
{
	struct sk_buff *skb;
2246 2247
	u32 pid = 0, seq = 0;
	struct nlmsghdr *nlh = NULL;
2248 2249
	int err = -ENOBUFS;

2250 2251 2252 2253 2254 2255 2256
	if (info) {
		pid = info->pid;
		nlh = info->nlh;
		if (nlh)
			seq = nlh->nlmsg_seq;
	}

2257
	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2258 2259 2260 2261
	if (skb == NULL)
		goto errout;

	err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2262 2263 2264 2265 2266 2267
	if (err < 0) {
		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
2268
	err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
2269 2270
errout:
	if (err < 0)
2271
		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err);
L
Linus Torvalds 已提交
2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292
}

/*
 *	/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)
{
2293
	struct seq_file *m = p_arg;
L
Linus Torvalds 已提交
2294

2295 2296
	seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
		   rt->rt6i_dst.plen);
L
Linus Torvalds 已提交
2297 2298

#ifdef CONFIG_IPV6_SUBTREES
2299 2300
	seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
		   rt->rt6i_src.plen);
L
Linus Torvalds 已提交
2301
#else
2302
	seq_puts(m, "00000000000000000000000000000000 00 ");
L
Linus Torvalds 已提交
2303 2304 2305
#endif

	if (rt->rt6i_nexthop) {
2306 2307
		seq_printf(m, NIP6_SEQFMT,
			   NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
L
Linus Torvalds 已提交
2308
	} else {
2309
		seq_puts(m, "00000000000000000000000000000000");
L
Linus Torvalds 已提交
2310
	}
2311 2312 2313 2314
	seq_printf(m, " %08x %08x %08x %08x %8s\n",
		   rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
		   rt->u.dst.__use, rt->rt6i_flags,
		   rt->rt6i_dev ? rt->rt6i_dev->name : "");
L
Linus Torvalds 已提交
2315 2316 2317
	return 0;
}

2318
static int ipv6_route_show(struct seq_file *m, void *v)
L
Linus Torvalds 已提交
2319
{
2320 2321 2322
	fib6_clean_all(rt6_info_route, 0, m);
	return 0;
}
L
Linus Torvalds 已提交
2323

2324 2325 2326
static int ipv6_route_open(struct inode *inode, struct file *file)
{
	return single_open(file, ipv6_route_show, NULL);
L
Linus Torvalds 已提交
2327 2328
}

2329 2330 2331 2332 2333 2334 2335 2336
static const struct file_operations ipv6_route_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= ipv6_route_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

L
Linus Torvalds 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
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);
}

2354
static const struct file_operations rt6_stats_seq_fops = {
L
Linus Torvalds 已提交
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379
	.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[] = {
2380
	{
L
Linus Torvalds 已提交
2381
		.procname	=	"flush",
2382
		.data		=	&flush_delay,
L
Linus Torvalds 已提交
2383
		.maxlen		=	sizeof(int),
2384
		.mode		=	0200,
2385
		.proc_handler	=	&ipv6_sysctl_rtcache_flush
L
Linus Torvalds 已提交
2386 2387 2388 2389
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_THRESH,
		.procname	=	"gc_thresh",
2390
		.data		=	&ip6_dst_ops.gc_thresh,
L
Linus Torvalds 已提交
2391 2392
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2393
		.proc_handler	=	&proc_dointvec,
L
Linus Torvalds 已提交
2394 2395 2396 2397
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MAX_SIZE,
		.procname	=	"max_size",
2398
		.data		=	&ip6_rt_max_size,
L
Linus Torvalds 已提交
2399 2400
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2401
		.proc_handler	=	&proc_dointvec,
L
Linus Torvalds 已提交
2402 2403 2404 2405
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL,
		.procname	=	"gc_min_interval",
2406
		.data		=	&ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2407 2408
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2409
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2410 2411 2412 2413 2414
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_TIMEOUT,
		.procname	=	"gc_timeout",
2415
		.data		=	&ip6_rt_gc_timeout,
L
Linus Torvalds 已提交
2416 2417
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2418
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2419 2420 2421 2422 2423
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_INTERVAL,
		.procname	=	"gc_interval",
2424
		.data		=	&ip6_rt_gc_interval,
L
Linus Torvalds 已提交
2425 2426
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2427
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2428 2429 2430 2431 2432
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_ELASTICITY,
		.procname	=	"gc_elasticity",
2433
		.data		=	&ip6_rt_gc_elasticity,
L
Linus Torvalds 已提交
2434 2435
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2436
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2437 2438 2439 2440 2441
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MTU_EXPIRES,
		.procname	=	"mtu_expires",
2442
		.data		=	&ip6_rt_mtu_expires,
L
Linus Torvalds 已提交
2443 2444
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2445
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2446 2447 2448 2449 2450
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MIN_ADVMSS,
		.procname	=	"min_adv_mss",
2451
		.data		=	&ip6_rt_min_advmss,
L
Linus Torvalds 已提交
2452 2453
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2454
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2455 2456 2457 2458 2459
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
		.procname	=	"gc_min_interval_ms",
2460
		.data		=	&ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2461 2462
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2463
		.proc_handler	=	&proc_dointvec_ms_jiffies,
L
Linus Torvalds 已提交
2464 2465 2466 2467 2468 2469 2470
		.strategy	=	&sysctl_ms_jiffies,
	},
	{ .ctl_name = 0 }
};

#endif

2471
int __init ip6_route_init(void)
L
Linus Torvalds 已提交
2472
{
2473 2474
	int ret;

A
Alexey Dobriyan 已提交
2475 2476
	ip6_dst_ops.kmem_cachep =
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2477 2478 2479 2480
				  SLAB_HWCACHE_ALIGN, NULL);
	if (!ip6_dst_ops.kmem_cachep)
		return -ENOMEM;

2481 2482
	ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;

2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497
	ret = fib6_init();
	if (ret)
		goto out_kmem_cache;

#ifdef CONFIG_PROC_FS
	ret = -ENOMEM;
	if (!proc_net_fops_create(&init_net, "ipv6_route",
				  0, &ipv6_route_proc_fops))
		goto out_fib6_init;

	if (!proc_net_fops_create(&init_net, "rt6_stats",
				  S_IRUGO, &rt6_stats_seq_fops))
		goto out_proc_ipv6_route;
#endif

L
Linus Torvalds 已提交
2498
#ifdef CONFIG_XFRM
2499 2500 2501
	ret = xfrm6_init();
	if (ret)
		goto out_proc_rt6_stats;
L
Linus Torvalds 已提交
2502
#endif
T
Thomas Graf 已提交
2503
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2504 2505 2506
	ret = fib6_rules_init();
	if (ret)
		goto xfrm6_init;
T
Thomas Graf 已提交
2507
#endif
2508 2509 2510 2511 2512
	ret = -ENOBUFS;
	if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
	    __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
	    __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
		goto fib6_rules_init;
2513

2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
	ret = 0;
out:
	return ret;

fib6_rules_init:
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_cleanup();
xfrm6_init:
#endif
#ifdef CONFIG_XFRM
	xfrm6_fini();
out_proc_rt6_stats:
#endif
#ifdef CONFIG_PROC_FS
	proc_net_remove(&init_net, "rt6_stats");
out_proc_ipv6_route:
	proc_net_remove(&init_net, "ipv6_route");
out_fib6_init:
#endif
	rt6_ifdown(NULL);
	fib6_gc_cleanup();
out_kmem_cache:
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
	goto out;
L
Linus Torvalds 已提交
2538 2539 2540 2541
}

void ip6_route_cleanup(void)
{
T
Thomas Graf 已提交
2542 2543 2544
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_cleanup();
#endif
2545 2546
	proc_net_remove(&init_net, "ipv6_route");
	proc_net_remove(&init_net, "rt6_stats");
L
Linus Torvalds 已提交
2547 2548 2549 2550 2551 2552 2553
#ifdef CONFIG_XFRM
	xfrm6_fini();
#endif
	rt6_ifdown(NULL);
	fib6_gc_cleanup();
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
}