route.c 67.7 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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 *
 *	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>
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#include <linux/mroute6.h>
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#include <linux/init.h>
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/nsproxy.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 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);
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static int		 ip6_dst_gc(struct dst_ops *ops);
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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
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static struct rt6_info *rt6_add_route_info(struct net *net,
					   struct in6_addr *prefix, int prefixlen,
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					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref);
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static struct rt6_info *rt6_get_route_info(struct net *net,
					   struct in6_addr *prefix, int prefixlen,
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					   struct in6_addr *gwaddr, int ifindex);
#endif

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static struct dst_ops ip6_dst_ops_template = {
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	.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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	.entries		=	ATOMIC_INIT(0),
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};

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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,
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	.entries		=	ATOMIC_INIT(0),
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};

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static struct rt6_info ip6_null_entry_template = {
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	.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,
		}
	},
	.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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static struct rt6_info ip6_prohibit_entry_template = {
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	.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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		}
	},
	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
	.rt6i_metric	= ~(u32) 0,
	.rt6i_ref	= ATOMIC_INIT(1),
};

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static struct rt6_info ip6_blk_hole_entry_template = {
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	.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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		}
	},
	.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 */
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static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops)
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{
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	return (struct rt6_info *)dst_alloc(ops);
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}

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 =
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		dev_net(dev)->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) &
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		(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK));
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}

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

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static inline struct rt6_info *rt6_device_match(struct net *net,
						    struct rt6_info *rt,
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						    struct in6_addr *saddr,
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						    int oif,
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						    int flags)
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{
	struct rt6_info *local = NULL;
	struct rt6_info *sprt;

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	if (!oif && ipv6_addr_any(saddr))
		goto out;

	for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
		struct net_device *dev = sprt->rt6i_dev;

		if (oif) {
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			if (dev->ifindex == oif)
				return sprt;
			if (dev->flags & IFF_LOOPBACK) {
				if (sprt->rt6i_idev == NULL ||
				    sprt->rt6i_idev->dev->ifindex != oif) {
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					if (flags & RT6_LOOKUP_F_IFACE && oif)
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						continue;
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					if (local && (!oif ||
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						      local->rt6i_idev->dev->ifindex == oif))
						continue;
				}
				local = sprt;
			}
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		} else {
			if (ipv6_chk_addr(net, saddr, dev,
					  flags & RT6_LOOKUP_F_IFACE))
				return sprt;
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		}
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	}
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	if (oif) {
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		if (local)
			return local;

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		if (flags & RT6_LOOKUP_F_IFACE)
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			return net->ipv6.ip6_null_entry;
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	}
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out:
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	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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	struct net *net;
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	RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
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		  __func__, 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",
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		  __func__, match);
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	net = dev_net(rt0->rt6i_dev);
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	return (match ? match : net->ipv6.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)
{
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	struct net *net = dev_net(dev);
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	struct route_info *rinfo = (struct route_info *) opt;
	struct in6_addr prefix_buf, *prefix;
	unsigned int pref;
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	unsigned long lifetime;
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	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 = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
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	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;
	}

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	rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
				dev->ifindex);
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	if (rt && !lifetime) {
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		ip6_del_rt(rt);
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		rt = NULL;
	}

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

	if (rt) {
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		if (!addrconf_finite_timeout(lifetime)) {
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			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(__net, saddr)			\
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do { \
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	if (rt == __net->ipv6.ip6_null_entry) {	\
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		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 net *net,
					     struct fib6_table *table,
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					     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(net, rt, &fl->fl6_src, fl->oif, flags);
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	BACKTRACK(net, &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;

}

561 562
struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
			    const struct in6_addr *saddr, int oif, int strict)
T
Thomas Graf 已提交
563 564 565 566 567 568 569 570 571 572
{
	struct flowi fl = {
		.oif = oif,
		.nl_u = {
			.ip6_u = {
				.daddr = *daddr,
			},
		},
	};
	struct dst_entry *dst;
573
	int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
T
Thomas Graf 已提交
574

575 576 577 578 579
	if (saddr) {
		memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
		flags |= RT6_LOOKUP_F_HAS_SADDR;
	}

580
	dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup);
T
Thomas Graf 已提交
581 582 583 584 585
	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
Linus Torvalds 已提交
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
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600
	struct fib6_table *table;
L
Linus Torvalds 已提交
601

T
Thomas Graf 已提交
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
	struct nl_info info = {
613
		.nl_net = dev_net(rt->rt6i_dev),
614
	};
615
	return __ip6_ins_rt(rt, &info);
616 617
}

618 619
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
620 621 622 623 624 625 626 627 628 629
{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
630 631 632
		struct neighbour *neigh;
		int attempts = !in_softirq();

633 634 635 636
		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
637
			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
638
		}
L
Linus Torvalds 已提交
639

640
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
L
Linus Torvalds 已提交
641 642 643 644 645 646 647 648 649 650 651
		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

652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
	retry:
		neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
		if (IS_ERR(neigh)) {
			struct net *net = dev_net(rt->rt6i_dev);
			int saved_rt_min_interval =
				net->ipv6.sysctl.ip6_rt_gc_min_interval;
			int saved_rt_elasticity =
				net->ipv6.sysctl.ip6_rt_gc_elasticity;

			if (attempts-- > 0) {
				net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
				net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;

				ip6_dst_gc(net->ipv6.ip6_dst_ops);

				net->ipv6.sysctl.ip6_rt_gc_elasticity =
					saved_rt_elasticity;
				net->ipv6.sysctl.ip6_rt_gc_min_interval =
					saved_rt_min_interval;
				goto retry;
			}

			if (net_ratelimit())
				printk(KERN_WARNING
				       "Neighbour table overflow.\n");
			dst_free(&rt->u.dst);
			return NULL;
		}
		rt->rt6i_nexthop = neigh;
L
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681

682
	}
L
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683

684 685
	return rt;
}
L
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686

687 688 689 690 691 692 693 694 695 696 697 698 699
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;
}

700 701
static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
				      struct flowi *fl, int flags)
L
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702 703
{
	struct fib6_node *fn;
704
	struct rt6_info *rt, *nrt;
T
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705
	int strict = 0;
L
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706
	int attempts = 3;
707
	int err;
708
	int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
Linus Torvalds 已提交
709

710
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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711 712

relookup:
T
Thomas Graf 已提交
713
	read_lock_bh(&table->tb6_lock);
L
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714

715
restart_2:
T
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716
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
717 718

restart:
719
	rt = rt6_select(fn, oif, strict | reachable);
720 721 722

	BACKTRACK(net, &fl->fl6_src);
	if (rt == net->ipv6.ip6_null_entry ||
723
	    rt->rt6i_flags & RTF_CACHE)
724
		goto out;
L
Linus Torvalds 已提交
725

726
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
727
	read_unlock_bh(&table->tb6_lock);
728

729
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
Thomas Graf 已提交
730
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
731 732
	else {
#if CLONE_OFFLINK_ROUTE
T
Thomas Graf 已提交
733
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
734 735 736 737
#else
		goto out2;
#endif
	}
738

739
	dst_release(&rt->u.dst);
740
	rt = nrt ? : net->ipv6.ip6_null_entry;
L
Linus Torvalds 已提交
741

742 743
	dst_hold(&rt->u.dst);
	if (nrt) {
744
		err = ip6_ins_rt(nrt);
745
		if (!err)
L
Linus Torvalds 已提交
746 747 748
			goto out2;
	}

749 750 751 752
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
753
	 * Race condition! In the gap, when table->tb6_lock was
754 755 756 757 758 759
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
760 761 762 763
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
764
	dst_hold(&rt->u.dst);
T
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765
	read_unlock_bh(&table->tb6_lock);
L
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766 767 768
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
Thomas Graf 已提交
769 770

	return rt;
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}

773
static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
774 775
					    struct flowi *fl, int flags)
{
776
	return ip6_pol_route(net, table, fl->iif, fl, flags);
777 778
}

T
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779 780
void ip6_route_input(struct sk_buff *skb)
{
781
	struct ipv6hdr *iph = ipv6_hdr(skb);
782
	struct net *net = dev_net(skb->dev);
783
	int flags = RT6_LOOKUP_F_HAS_SADDR;
T
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784 785 786 787 788 789
	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
A
Al Viro 已提交
790
				.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
T
Thomas Graf 已提交
791 792
			},
		},
793
		.mark = skb->mark,
T
Thomas Graf 已提交
794 795
		.proto = iph->nexthdr,
	};
796

T
Thomas Goff 已提交
797
	if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG)
798
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
799

800
	skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input);
T
Thomas Graf 已提交
801 802
}

803
static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
T
Thomas Graf 已提交
804
					     struct flowi *fl, int flags)
L
Linus Torvalds 已提交
805
{
806
	return ip6_pol_route(net, table, fl->oif, fl, flags);
T
Thomas Graf 已提交
807 808
}

809 810
struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
				    struct flowi *fl)
T
Thomas Graf 已提交
811 812 813 814
{
	int flags = 0;

	if (rt6_need_strict(&fl->fl6_dst))
815
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
816

817 818
	if (!ipv6_addr_any(&fl->fl6_src))
		flags |= RT6_LOOKUP_F_HAS_SADDR;
819 820 821 822 823 824 825 826 827
	else if (sk) {
		unsigned int prefs = inet6_sk(sk)->srcprefs;
		if (prefs & IPV6_PREFER_SRC_TMP)
			flags |= RT6_LOOKUP_F_SRCPREF_TMP;
		if (prefs & IPV6_PREFER_SRC_PUBLIC)
			flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC;
		if (prefs & IPV6_PREFER_SRC_COA)
			flags |= RT6_LOOKUP_F_SRCPREF_COA;
	}
828

829
	return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output);
L
Linus Torvalds 已提交
830 831
}

832
EXPORT_SYMBOL(ip6_route_output);
L
Linus Torvalds 已提交
833

834 835 836 837 838 839 840 841 842 843 844 845
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;
846 847
		new->input = dst_discard;
		new->output = dst_discard;
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875

		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);

L
Linus Torvalds 已提交
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
/*
 *	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)
898
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
		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;
932
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
L
Linus Torvalds 已提交
933 934 935 936 937
	}
}

static int ipv6_get_mtu(struct net_device *dev);

938
static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu)
L
Linus Torvalds 已提交
939 940 941
{
	mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);

942 943
	if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
		mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
L
Linus Torvalds 已提交
944 945

	/*
946 947 948
	 * 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
949 950 951 952 953 954 955
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

956 957
static struct dst_entry *icmp6_dst_gc_list;
static DEFINE_SPINLOCK(icmp6_dst_lock);
958

959
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
L
Linus Torvalds 已提交
960
				  struct neighbour *neigh,
961
				  const struct in6_addr *addr)
L
Linus Torvalds 已提交
962 963 964
{
	struct rt6_info *rt;
	struct inet6_dev *idev = in6_dev_get(dev);
965
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
966 967 968 969

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

970
	rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
L
Linus Torvalds 已提交
971 972 973 974 975 976 977 978
	if (unlikely(rt == NULL)) {
		in6_dev_put(idev);
		goto out;
	}

	dev_hold(dev);
	if (neigh)
		neigh_hold(neigh);
979
	else {
L
Linus Torvalds 已提交
980
		neigh = ndisc_get_neigh(dev, addr);
981 982 983
		if (IS_ERR(neigh))
			neigh = NULL;
	}
L
Linus Torvalds 已提交
984 985 986 987 988 989 990

	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);
991
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
992
	rt->u.dst.output  = ip6_output;
L
Linus Torvalds 已提交
993 994

#if 0	/* there's no chance to use these for ndisc */
995 996
	rt->u.dst.flags   = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
				? DST_HOST
L
Linus Torvalds 已提交
997 998 999 1000 1001
				: 0;
	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
#endif

1002 1003 1004 1005
	spin_lock_bh(&icmp6_dst_lock);
	rt->u.dst.next = icmp6_dst_gc_list;
	icmp6_dst_gc_list = &rt->u.dst;
	spin_unlock_bh(&icmp6_dst_lock);
L
Linus Torvalds 已提交
1006

1007
	fib6_force_start_gc(net);
L
Linus Torvalds 已提交
1008 1009

out:
1010
	return &rt->u.dst;
L
Linus Torvalds 已提交
1011 1012
}

1013
int icmp6_dst_gc(void)
L
Linus Torvalds 已提交
1014 1015
{
	struct dst_entry *dst, *next, **pprev;
1016
	int more = 0;
L
Linus Torvalds 已提交
1017 1018

	next = NULL;
1019

1020 1021
	spin_lock_bh(&icmp6_dst_lock);
	pprev = &icmp6_dst_gc_list;
1022

L
Linus Torvalds 已提交
1023 1024 1025 1026 1027 1028
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
		} else {
			pprev = &dst->next;
1029
			++more;
L
Linus Torvalds 已提交
1030 1031 1032
		}
	}

1033
	spin_unlock_bh(&icmp6_dst_lock);
1034

1035
	return more;
L
Linus Torvalds 已提交
1036 1037
}

1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
			    void *arg)
{
	struct dst_entry *dst, **pprev;

	spin_lock_bh(&icmp6_dst_lock);
	pprev = &icmp6_dst_gc_list;
	while ((dst = *pprev) != NULL) {
		struct rt6_info *rt = (struct rt6_info *) dst;
		if (func(rt, arg)) {
			*pprev = dst->next;
			dst_free(dst);
		} else {
			pprev = &dst->next;
		}
	}
	spin_unlock_bh(&icmp6_dst_lock);
}

1057
static int ip6_dst_gc(struct dst_ops *ops)
L
Linus Torvalds 已提交
1058 1059
{
	unsigned long now = jiffies;
1060 1061 1062 1063 1064 1065 1066 1067 1068
	struct net *net = ops->dst_net;
	int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
	int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
	int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
	int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
	unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;

	if (time_after(rt_last_gc + rt_min_interval, now) &&
	    atomic_read(&ops->entries) <= rt_max_size)
L
Linus Torvalds 已提交
1069 1070
		goto out;

1071 1072 1073
	net->ipv6.ip6_rt_gc_expire++;
	fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
	net->ipv6.ip6_rt_last_gc = now;
1074 1075
	if (atomic_read(&ops->entries) < ops->gc_thresh)
		net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
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out:
1077 1078
	net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
	return (atomic_read(&ops->entries) > rt_max_size);
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}

/* 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;
}

1100
int ip6_dst_hoplimit(struct dst_entry *dst)
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1101
{
1102 1103 1104 1105 1106 1107 1108 1109
	int hoplimit = dst_metric(dst, RTAX_HOPLIMIT);
	if (hoplimit < 0) {
		struct net_device *dev = dst->dev;
		struct inet6_dev *idev = in6_dev_get(dev);
		if (idev) {
			hoplimit = idev->cnf.hop_limit;
			in6_dev_put(idev);
		} else
1110
			hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
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	}
	return hoplimit;
}

/*
 *
 */

1119
int ip6_route_add(struct fib6_config *cfg)
L
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1120 1121
{
	int err;
1122
	struct net *net = cfg->fc_nlinfo.nl_net;
L
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	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
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1126
	struct fib6_table *table;
L
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1127 1128
	int addr_type;

1129
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
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1130 1131
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1132
	if (cfg->fc_src_len)
L
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1133 1134
		return -EINVAL;
#endif
1135
	if (cfg->fc_ifindex) {
L
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1136
		err = -ENODEV;
1137
		dev = dev_get_by_index(net, cfg->fc_ifindex);
L
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1138 1139 1140 1141 1142 1143 1144
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1145 1146
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
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1147

1148
	table = fib6_new_table(net, cfg->fc_table);
T
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1149 1150 1151 1152 1153
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

1154
	rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
L
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1155 1156 1157 1158 1159 1160 1161

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

	rt->u.dst.obsolete = -1;
1162 1163 1164
	rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ?
				jiffies + clock_t_to_jiffies(cfg->fc_expires) :
				0;
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1165

1166 1167 1168 1169 1170
	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);
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	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;

1179 1180
	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
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	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1185 1186
	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
	rt->rt6i_src.plen = cfg->fc_src_len;
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#endif

1189
	rt->rt6i_metric = cfg->fc_metric;
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	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1194
	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. */
1197
		if (dev != net->loopback_dev) {
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			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
1202
			dev = 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;
	}

1217
	if (cfg->fc_flags & RTF_GATEWAY) {
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		struct in6_addr *gw_addr;
		int gwa_type;

1221 1222
		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;

1239
			grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
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1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270

			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;

1271
	if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
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1272 1273 1274 1275 1276 1277 1278 1279
		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;
		}
	}

1280
	rt->rt6i_flags = cfg->fc_flags;
L
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1281 1282

install_route:
1283 1284 1285 1286 1287
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

		nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1288
			int type = nla_type(nla);
1289 1290 1291

			if (type) {
				if (type > RTAX_MAX) {
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					err = -EINVAL;
					goto out;
				}
1295 1296

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

1301
	if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
L
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1302
		rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1303
	if (!dst_mtu(&rt->u.dst))
L
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1304
		rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1305
	if (!dst_metric(&rt->u.dst, RTAX_ADVMSS))
1306
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
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	rt->u.dst.dev = dev;
	rt->rt6i_idev = idev;
T
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	rt->rt6i_table = table;
1310

1311
	cfg->fc_nlinfo.nl_net = dev_net(dev);
1312

1313
	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
L
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out:
	if (dev)
		dev_put(dev);
	if (idev)
		in6_dev_put(idev);
	if (rt)
1321
		dst_free(&rt->u.dst);
L
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	return err;
}

1325
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
L
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1326 1327
{
	int err;
T
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1328
	struct fib6_table *table;
1329
	struct net *net = dev_net(rt->rt6i_dev);
L
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1330

1331
	if (rt == net->ipv6.ip6_null_entry)
1332 1333
		return -ENOENT;

T
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1334 1335
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
L
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1336

1337
	err = fib6_del(rt, info);
L
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1338 1339
	dst_release(&rt->u.dst);

T
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1340
	write_unlock_bh(&table->tb6_lock);
L
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1341 1342 1343 1344

	return err;
}

1345 1346
int ip6_del_rt(struct rt6_info *rt)
{
1347
	struct nl_info info = {
1348
		.nl_net = dev_net(rt->rt6i_dev),
1349
	};
1350
	return __ip6_del_rt(rt, &info);
1351 1352
}

1353
static int ip6_route_del(struct fib6_config *cfg)
L
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1354
{
T
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1355
	struct fib6_table *table;
L
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1356 1357 1358 1359
	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1360
	table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
T
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1361 1362 1363 1364
	if (table == NULL)
		return err;

	read_lock_bh(&table->tb6_lock);
L
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1365

T
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1366
	fn = fib6_locate(&table->tb6_root,
1367 1368
			 &cfg->fc_dst, cfg->fc_dst_len,
			 &cfg->fc_src, cfg->fc_src_len);
1369

L
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1370
	if (fn) {
1371
		for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1372
			if (cfg->fc_ifindex &&
L
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			    (rt->rt6i_dev == NULL ||
1374
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
L
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1375
				continue;
1376 1377
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
L
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1378
				continue;
1379
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
L
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1380 1381
				continue;
			dst_hold(&rt->u.dst);
T
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1382
			read_unlock_bh(&table->tb6_lock);
L
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1383

1384
			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
L
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1385 1386
		}
	}
T
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1387
	read_unlock_bh(&table->tb6_lock);
L
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1388 1389 1390 1391 1392 1393 1394

	return err;
}

/*
 *	Handle redirects
 */
1395 1396 1397 1398 1399
struct ip6rd_flowi {
	struct flowi fl;
	struct in6_addr gateway;
};

1400 1401
static struct rt6_info *__ip6_route_redirect(struct net *net,
					     struct fib6_table *table,
1402 1403
					     struct flowi *fl,
					     int flags)
L
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1404
{
1405 1406
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1407
	struct fib6_node *fn;
T
Thomas Graf 已提交
1408

L
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1409
	/*
1410 1411 1412 1413 1414 1415 1416 1417
	 * 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.
L
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1418 1419
	 */

T
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1420
	read_lock_bh(&table->tb6_lock);
1421
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1422
restart:
1423
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
		/*
		 * 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;
1436
		if (fl->oif != rt->rt6i_dev->ifindex)
1437
			continue;
1438
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1439 1440 1441
			continue;
		break;
	}
1442

1443
	if (!rt)
1444 1445
		rt = net->ipv6.ip6_null_entry;
	BACKTRACK(net, &fl->fl6_src);
1446
out:
1447 1448
	dst_hold(&rt->u.dst);

T
Thomas Graf 已提交
1449
	read_unlock_bh(&table->tb6_lock);
1450

1451 1452 1453 1454 1455 1456 1457 1458
	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)
{
1459
	int flags = RT6_LOOKUP_F_HAS_SADDR;
1460
	struct net *net = dev_net(dev);
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1473 1474 1475

	if (rt6_need_strict(dest))
		flags |= RT6_LOOKUP_F_IFACE;
1476

1477
	return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl,
1478
						   flags, __ip6_route_redirect);
1479 1480 1481 1482 1483 1484 1485 1486
}

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;
1487
	struct net *net = dev_net(neigh->dev);
1488 1489 1490

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

1491
	if (rt == net->ipv6.ip6_null_entry) {
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1492 1493 1494
		if (net_ratelimit())
			printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
			       "for redirect target\n");
1495
		goto out;
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1496 1497 1498 1499 1500 1501
	}

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

1502
	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);
1536
	nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev),
1537
							dst_mtu(&nrt->u.dst));
L
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1538

1539
	if (ip6_ins_rt(nrt))
L
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1540 1541
		goto out;

1542 1543 1544 1545
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

L
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1546
	if (rt->rt6i_flags&RTF_CACHE) {
1547
		ip6_del_rt(rt);
L
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1548 1549 1550 1551
		return;
	}

out:
1552
	dst_release(&rt->u.dst);
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1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
	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;
1565
	struct net *net = dev_net(dev);
L
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1566 1567
	int allfrag = 0;

1568
	rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
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	if (rt == NULL)
		return;

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

	if (pmtu < IPV6_MIN_MTU) {
		/*
1577
		 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
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1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
		 * 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;
1601
		dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606 1607 1608 1609 1610
		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.
	 */
1611
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1612
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1613 1614
	else
		nrt = rt6_alloc_clone(rt, daddr);
1615

1616
	if (nrt) {
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
		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.
		 */
1627
		dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1628 1629
		nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;

1630
		ip6_ins_rt(nrt);
L
Linus Torvalds 已提交
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641
	}
out:
	dst_release(&rt->u.dst);
}

/*
 *	Misc support functions
 */

static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
{
1642
	struct net *net = dev_net(ort->rt6i_dev);
1643
	struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
L
Linus Torvalds 已提交
1644 1645 1646 1647 1648 1649

	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));
1650
		rt->u.dst.error = ort->u.dst.error;
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667
		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
1668
		rt->rt6i_table = ort->rt6i_table;
L
Linus Torvalds 已提交
1669 1670 1671 1672
	}
	return rt;
}

1673
#ifdef CONFIG_IPV6_ROUTE_INFO
1674 1675
static struct rt6_info *rt6_get_route_info(struct net *net,
					   struct in6_addr *prefix, int prefixlen,
1676 1677 1678 1679
					   struct in6_addr *gwaddr, int ifindex)
{
	struct fib6_node *fn;
	struct rt6_info *rt = NULL;
T
Thomas Graf 已提交
1680 1681
	struct fib6_table *table;

1682
	table = fib6_get_table(net, RT6_TABLE_INFO);
T
Thomas Graf 已提交
1683 1684
	if (table == NULL)
		return NULL;
1685

T
Thomas Graf 已提交
1686 1687
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1688 1689 1690
	if (!fn)
		goto out;

1691
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
		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
1702
	write_unlock_bh(&table->tb6_lock);
1703 1704 1705
	return rt;
}

1706 1707
static struct rt6_info *rt6_add_route_info(struct net *net,
					   struct in6_addr *prefix, int prefixlen,
1708 1709 1710
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1711 1712
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_INFO,
1713
		.fc_metric	= IP6_RT_PRIO_USER,
1714 1715 1716 1717
		.fc_ifindex	= ifindex,
		.fc_dst_len	= prefixlen,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
				  RTF_UP | RTF_PREF(pref),
1718 1719 1720
		.fc_nlinfo.pid = 0,
		.fc_nlinfo.nlh = NULL,
		.fc_nlinfo.nl_net = net,
1721 1722 1723 1724
	};

	ipv6_addr_copy(&cfg.fc_dst, prefix);
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1725

1726 1727
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1728
		cfg.fc_flags |= RTF_DEFAULT;
1729

1730
	ip6_route_add(&cfg);
1731

1732
	return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1733 1734 1735
}
#endif

L
Linus Torvalds 已提交
1736
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1737
{
L
Linus Torvalds 已提交
1738
	struct rt6_info *rt;
T
Thomas Graf 已提交
1739
	struct fib6_table *table;
L
Linus Torvalds 已提交
1740

1741
	table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
T
Thomas Graf 已提交
1742 1743
	if (table == NULL)
		return NULL;
L
Linus Torvalds 已提交
1744

T
Thomas Graf 已提交
1745
	write_lock_bh(&table->tb6_lock);
1746
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1747
		if (dev == rt->rt6i_dev &&
1748
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
Linus Torvalds 已提交
1749 1750 1751 1752 1753
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1754
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1755 1756 1757 1758
	return rt;
}

struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1759 1760
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1761
{
1762 1763
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_DFLT,
1764
		.fc_metric	= IP6_RT_PRIO_USER,
1765 1766 1767
		.fc_ifindex	= dev->ifindex,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1768 1769
		.fc_nlinfo.pid = 0,
		.fc_nlinfo.nlh = NULL,
1770
		.fc_nlinfo.nl_net = dev_net(dev),
1771
	};
L
Linus Torvalds 已提交
1772

1773
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
Linus Torvalds 已提交
1774

1775
	ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1776 1777 1778 1779

	return rt6_get_dflt_router(gwaddr, dev);
}

1780
void rt6_purge_dflt_routers(struct net *net)
L
Linus Torvalds 已提交
1781 1782
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1783 1784 1785
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
1786
	table = fib6_get_table(net, RT6_TABLE_DFLT);
T
Thomas Graf 已提交
1787 1788
	if (table == NULL)
		return;
L
Linus Torvalds 已提交
1789 1790

restart:
T
Thomas Graf 已提交
1791
	read_lock_bh(&table->tb6_lock);
1792
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1793 1794
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1795
			read_unlock_bh(&table->tb6_lock);
1796
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1797 1798 1799
			goto restart;
		}
	}
T
Thomas Graf 已提交
1800
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1801 1802
}

1803 1804
static void rtmsg_to_fib6_config(struct net *net,
				 struct in6_rtmsg *rtmsg,
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
				 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;

1817
	cfg->fc_nlinfo.nl_net = net;
1818

1819 1820 1821 1822 1823
	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);
}

1824
int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
1825
{
1826
	struct fib6_config cfg;
L
Linus Torvalds 已提交
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
	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;
1839

1840
		rtmsg_to_fib6_config(net, &rtmsg, &cfg);
1841

L
Linus Torvalds 已提交
1842 1843 1844
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1845
			err = ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1846 1847
			break;
		case SIOCDELRT:
1848
			err = ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1849 1850 1851 1852 1853 1854 1855
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
1856
	}
L
Linus Torvalds 已提交
1857 1858 1859 1860 1861 1862 1863 1864

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

I
Ilpo Järvinen 已提交
1865
static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
L
Linus Torvalds 已提交
1866
{
1867
	int type;
1868
	struct dst_entry *dst = skb->dst;
1869 1870
	switch (ipstats_mib_noroutes) {
	case IPSTATS_MIB_INNOROUTES:
1871
		type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1872
		if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1873 1874
			IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
				      IPSTATS_MIB_INADDRERRORS);
1875 1876 1877 1878
			break;
		}
		/* FALLTHROUGH */
	case IPSTATS_MIB_OUTNOROUTES:
1879 1880
		IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
			      ipstats_mib_noroutes);
1881 1882
		break;
	}
1883
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
L
Linus Torvalds 已提交
1884 1885 1886 1887
	kfree_skb(skb);
	return 0;
}

1888 1889
static int ip6_pkt_discard(struct sk_buff *skb)
{
1890
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1891 1892
}

1893
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1894 1895
{
	skb->dev = skb->dst->dev;
1896
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
L
Linus Torvalds 已提交
1897 1898
}

1899 1900
#ifdef CONFIG_IPV6_MULTIPLE_TABLES

1901 1902
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
1903
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1904 1905 1906 1907 1908
}

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb->dst->dev;
1909
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1910 1911
}

1912 1913
#endif

L
Linus Torvalds 已提交
1914 1915 1916 1917 1918 1919 1920 1921
/*
 *	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)
{
1922
	struct net *net = dev_net(idev->dev);
1923
	struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1924
	struct neighbour *neigh;
L
Linus Torvalds 已提交
1925 1926 1927 1928

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

1929
	dev_hold(net->loopback_dev);
L
Linus Torvalds 已提交
1930 1931 1932 1933 1934
	in6_dev_hold(idev);

	rt->u.dst.flags = DST_HOST;
	rt->u.dst.input = ip6_input;
	rt->u.dst.output = ip6_output;
1935
	rt->rt6i_dev = net->loopback_dev;
L
Linus Torvalds 已提交
1936 1937
	rt->rt6i_idev = idev;
	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1938
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
L
Linus Torvalds 已提交
1939 1940 1941 1942
	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
	rt->u.dst.obsolete = -1;

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1943 1944 1945
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1946
		rt->rt6i_flags |= RTF_LOCAL;
1947 1948
	neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
	if (IS_ERR(neigh)) {
1949
		dst_free(&rt->u.dst);
1950 1951 1952 1953 1954 1955 1956

		/* We are casting this because that is the return
		 * value type.  But an errno encoded pointer is the
		 * same regardless of the underlying pointer type,
		 * and that's what we are returning.  So this is OK.
		 */
		return (struct rt6_info *) neigh;
L
Linus Torvalds 已提交
1957
	}
1958
	rt->rt6i_nexthop = neigh;
L
Linus Torvalds 已提交
1959 1960 1961

	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
1962
	rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1963 1964 1965 1966 1967 1968

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

	return rt;
}

1969 1970 1971 1972 1973
struct arg_dev_net {
	struct net_device *dev;
	struct net *net;
};

L
Linus Torvalds 已提交
1974 1975
static int fib6_ifdown(struct rt6_info *rt, void *arg)
{
1976 1977 1978 1979 1980
	struct net_device *dev = ((struct arg_dev_net *)arg)->dev;
	struct net *net = ((struct arg_dev_net *)arg)->net;

	if (((void *)rt->rt6i_dev == dev || dev == NULL) &&
	    rt != net->ipv6.ip6_null_entry) {
L
Linus Torvalds 已提交
1981 1982 1983 1984 1985 1986
		RT6_TRACE("deleted by ifdown %p\n", rt);
		return -1;
	}
	return 0;
}

1987
void rt6_ifdown(struct net *net, struct net_device *dev)
L
Linus Torvalds 已提交
1988
{
1989 1990 1991 1992 1993 1994
	struct arg_dev_net adn = {
		.dev = dev,
		.net = net,
	};

	fib6_clean_all(net, fib6_ifdown, 0, &adn);
1995
	icmp6_clean_all(fib6_ifdown, &adn);
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
}

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;
2008
	struct net *net = dev_net(arg->dev);
L
Linus Torvalds 已提交
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035

	/* 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) &&
2036
	    (dst_mtu(&rt->u.dst) >= arg->mtu ||
2037
	     (dst_mtu(&rt->u.dst) < arg->mtu &&
2038
	      dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
L
Linus Torvalds 已提交
2039
		rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
2040
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu);
2041
	}
L
Linus Torvalds 已提交
2042 2043 2044 2045 2046
	return 0;
}

void rt6_mtu_change(struct net_device *dev, unsigned mtu)
{
T
Thomas Graf 已提交
2047 2048 2049 2050
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
2051

2052
	fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
2053 2054
}

2055
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2056
	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
2057
	[RTA_OIF]               = { .type = NLA_U32 },
2058
	[RTA_IIF]		= { .type = NLA_U32 },
2059 2060 2061 2062 2063 2064
	[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
2065
{
2066 2067 2068
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
2069

2070 2071 2072
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2073

2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
	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;
2089
	cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2090 2091 2092 2093

	if (tb[RTA_GATEWAY]) {
		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
		cfg->fc_flags |= RTF_GATEWAY;
L
Linus Torvalds 已提交
2094
	}
2095 2096 2097 2098 2099 2100 2101 2102

	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
2103
	}
2104 2105 2106 2107 2108 2109 2110 2111

	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
2112
	}
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122

	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
2123
	}
2124 2125 2126 2127 2128 2129 2130

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
2131 2132
}

2133
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2134
{
2135 2136
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2137

2138 2139 2140 2141 2142
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
2143 2144
}

2145
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2146
{
2147 2148
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2149

2150 2151 2152 2153 2154
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
2155 2156
}

2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
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 */
2168
	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2169 2170 2171
	       + nla_total_size(sizeof(struct rta_cacheinfo));
}

2172 2173
static int rt6_fill_node(struct net *net,
			 struct sk_buff *skb, struct rt6_info *rt,
2174 2175
			 struct in6_addr *dst, struct in6_addr *src,
			 int iif, int type, u32 pid, u32 seq,
2176
			 int prefix, int nowait, unsigned int flags)
L
Linus Torvalds 已提交
2177 2178
{
	struct rtmsg *rtm;
2179
	struct nlmsghdr *nlh;
2180
	long expires;
2181
	u32 table;
L
Linus Torvalds 已提交
2182 2183 2184 2185 2186 2187 2188 2189

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

2190 2191
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
	if (nlh == NULL)
2192
		return -EMSGSIZE;
2193 2194

	rtm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
2195 2196 2197 2198
	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
2199
	if (rt->rt6i_table)
2200
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
2201
	else
2202 2203
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2204
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224
	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) {
2225
		NLA_PUT(skb, RTA_DST, 16, dst);
2226
		rtm->rtm_dst_len = 128;
L
Linus Torvalds 已提交
2227
	} else if (rtm->rtm_dst_len)
2228
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2229 2230
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2231
		NLA_PUT(skb, RTA_SRC, 16, src);
2232
		rtm->rtm_src_len = 128;
L
Linus Torvalds 已提交
2233
	} else if (rtm->rtm_src_len)
2234
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2235
#endif
2236 2237 2238
	if (iif) {
#ifdef CONFIG_IPV6_MROUTE
		if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2239
			int err = ip6mr_get_route(net, skb, rtm, nowait);
2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
			if (err <= 0) {
				if (!nowait) {
					if (err == 0)
						return 0;
					goto nla_put_failure;
				} else {
					if (err == -EMSGSIZE)
						goto nla_put_failure;
				}
			}
		} else
#endif
			NLA_PUT_U32(skb, RTA_IIF, iif);
	} else if (dst) {
2254
		struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst);
L
Linus Torvalds 已提交
2255
		struct in6_addr saddr_buf;
2256
		if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2257
				       dst, 0, &saddr_buf) == 0)
2258
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2259
	}
2260

L
Linus Torvalds 已提交
2261
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2262 2263
		goto nla_put_failure;

L
Linus Torvalds 已提交
2264
	if (rt->u.dst.neighbour)
2265 2266
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2267
	if (rt->u.dst.dev)
2268 2269 2270
		NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);

	NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2271

2272 2273 2274 2275 2276 2277
	if (!(rt->rt6i_flags & RTF_EXPIRES))
		expires = 0;
	else if (rt->rt6i_expires - jiffies < INT_MAX)
		expires = rt->rt6i_expires - jiffies;
	else
		expires = INT_MAX;
2278

2279 2280 2281
	if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
			       expires, rt->u.dst.error) < 0)
		goto nla_put_failure;
2282 2283 2284 2285

	return nlmsg_end(skb, nlh);

nla_put_failure:
2286 2287
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
2288 2289
}

2290
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2291 2292 2293 2294
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2295 2296
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2297 2298 2299 2300
		prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
	} else
		prefix = 0;

2301 2302
	return rt6_fill_node(arg->net,
		     arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
L
Linus Torvalds 已提交
2303
		     NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2304
		     prefix, 0, NLM_F_MULTI);
L
Linus Torvalds 已提交
2305 2306
}

2307
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2308
{
2309
	struct net *net = sock_net(in_skb->sk);
2310 2311
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
Linus Torvalds 已提交
2312
	struct sk_buff *skb;
2313
	struct rtmsg *rtm;
L
Linus Torvalds 已提交
2314
	struct flowi fl;
2315
	int err, iif = 0;
L
Linus Torvalds 已提交
2316

2317 2318 2319
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2320

2321
	err = -EINVAL;
L
Linus Torvalds 已提交
2322 2323
	memset(&fl, 0, sizeof(fl));

2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
	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
2343 2344 2345

	if (iif) {
		struct net_device *dev;
2346
		dev = __dev_get_by_index(net, iif);
L
Linus Torvalds 已提交
2347 2348
		if (!dev) {
			err = -ENODEV;
2349
			goto errout;
L
Linus Torvalds 已提交
2350 2351 2352
		}
	}

2353 2354 2355 2356 2357
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
L
Linus Torvalds 已提交
2358

2359 2360 2361
	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
2362
	skb_reset_mac_header(skb);
2363
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
L
Linus Torvalds 已提交
2364

2365
	rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl);
L
Linus Torvalds 已提交
2366 2367
	skb->dst = &rt->u.dst;

2368
	err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
Linus Torvalds 已提交
2369
			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2370
			    nlh->nlmsg_seq, 0, 0, 0);
L
Linus Torvalds 已提交
2371
	if (err < 0) {
2372 2373
		kfree_skb(skb);
		goto errout;
L
Linus Torvalds 已提交
2374 2375
	}

2376
	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
2377
errout:
L
Linus Torvalds 已提交
2378 2379 2380
	return err;
}

2381
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
2382 2383
{
	struct sk_buff *skb;
2384
	struct net *net = info->nl_net;
2385 2386 2387 2388 2389
	u32 seq;
	int err;

	err = -ENOBUFS;
	seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
2390

2391
	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2392 2393 2394
	if (skb == NULL)
		goto errout;

2395
	err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2396
				event, info->pid, seq, 0, 0, 0);
2397 2398 2399 2400 2401 2402
	if (err < 0) {
		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
2403 2404
	err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
			  info->nlh, gfp_any());
2405 2406
errout:
	if (err < 0)
2407
		rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
L
Linus Torvalds 已提交
2408 2409
}

2410 2411 2412 2413
static int ip6_route_dev_notify(struct notifier_block *this,
				unsigned long event, void *data)
{
	struct net_device *dev = (struct net_device *)data;
2414
	struct net *net = dev_net(dev);
2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429

	if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
		net->ipv6.ip6_null_entry->u.dst.dev = dev;
		net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
		net->ipv6.ip6_prohibit_entry->u.dst.dev = dev;
		net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
		net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev;
		net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
#endif
	}

	return NOTIFY_OK;
}

L
Linus Torvalds 已提交
2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448
/*
 *	/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)
{
2449
	struct seq_file *m = p_arg;
L
Linus Torvalds 已提交
2450

2451
	seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
L
Linus Torvalds 已提交
2452 2453

#ifdef CONFIG_IPV6_SUBTREES
2454
	seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
L
Linus Torvalds 已提交
2455
#else
2456
	seq_puts(m, "00000000000000000000000000000000 00 ");
L
Linus Torvalds 已提交
2457 2458 2459
#endif

	if (rt->rt6i_nexthop) {
2460
		seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key);
L
Linus Torvalds 已提交
2461
	} else {
2462
		seq_puts(m, "00000000000000000000000000000000");
L
Linus Torvalds 已提交
2463
	}
2464 2465 2466 2467
	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
2468 2469 2470
	return 0;
}

2471
static int ipv6_route_show(struct seq_file *m, void *v)
L
Linus Torvalds 已提交
2472
{
2473 2474
	struct net *net = (struct net *)m->private;
	fib6_clean_all(net, rt6_info_route, 0, m);
2475 2476
	return 0;
}
L
Linus Torvalds 已提交
2477

2478 2479
static int ipv6_route_open(struct inode *inode, struct file *file)
{
2480
	return single_open_net(inode, file, ipv6_route_show);
2481 2482
}

2483 2484 2485 2486 2487
static const struct file_operations ipv6_route_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= ipv6_route_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2488
	.release	= single_release_net,
2489 2490
};

L
Linus Torvalds 已提交
2491 2492
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
{
2493
	struct net *net = (struct net *)seq->private;
L
Linus Torvalds 已提交
2494
	seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2495 2496 2497 2498 2499
		   net->ipv6.rt6_stats->fib_nodes,
		   net->ipv6.rt6_stats->fib_route_nodes,
		   net->ipv6.rt6_stats->fib_rt_alloc,
		   net->ipv6.rt6_stats->fib_rt_entries,
		   net->ipv6.rt6_stats->fib_rt_cache,
2500
		   atomic_read(&net->ipv6.ip6_dst_ops->entries),
2501
		   net->ipv6.rt6_stats->fib_discarded_routes);
L
Linus Torvalds 已提交
2502 2503 2504 2505 2506 2507

	return 0;
}

static int rt6_stats_seq_open(struct inode *inode, struct file *file)
{
2508
	return single_open_net(inode, file, rt6_stats_seq_show);
2509 2510
}

2511
static const struct file_operations rt6_stats_seq_fops = {
L
Linus Torvalds 已提交
2512 2513 2514 2515
	.owner	 = THIS_MODULE,
	.open	 = rt6_stats_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
2516
	.release = single_release_net,
L
Linus Torvalds 已提交
2517 2518 2519 2520 2521 2522 2523 2524 2525
};
#endif	/* CONFIG_PROC_FS */

#ifdef CONFIG_SYSCTL

static
int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
			      void __user *buffer, size_t *lenp, loff_t *ppos)
{
2526 2527
	struct net *net = current->nsproxy->net_ns;
	int delay = net->ipv6.sysctl.flush_delay;
L
Linus Torvalds 已提交
2528 2529
	if (write) {
		proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2530
		fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
L
Linus Torvalds 已提交
2531 2532 2533 2534 2535
		return 0;
	} else
		return -EINVAL;
}

2536
ctl_table ipv6_route_table_template[] = {
2537
	{
L
Linus Torvalds 已提交
2538
		.procname	=	"flush",
2539
		.data		=	&init_net.ipv6.sysctl.flush_delay,
L
Linus Torvalds 已提交
2540
		.maxlen		=	sizeof(int),
2541
		.mode		=	0200,
A
Alexey Dobriyan 已提交
2542
		.proc_handler	=	ipv6_sysctl_rtcache_flush
L
Linus Torvalds 已提交
2543 2544 2545 2546
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_THRESH,
		.procname	=	"gc_thresh",
2547
		.data		=	&ip6_dst_ops_template.gc_thresh,
L
Linus Torvalds 已提交
2548 2549
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2550
		.proc_handler	=	proc_dointvec,
L
Linus Torvalds 已提交
2551 2552 2553 2554
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MAX_SIZE,
		.procname	=	"max_size",
2555
		.data		=	&init_net.ipv6.sysctl.ip6_rt_max_size,
L
Linus Torvalds 已提交
2556 2557
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2558
		.proc_handler	=	proc_dointvec,
L
Linus Torvalds 已提交
2559 2560 2561 2562
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL,
		.procname	=	"gc_min_interval",
2563
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2564 2565
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2566 2567
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2568 2569 2570 2571
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_TIMEOUT,
		.procname	=	"gc_timeout",
2572
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_timeout,
L
Linus Torvalds 已提交
2573 2574
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2575 2576
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2577 2578 2579 2580
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_INTERVAL,
		.procname	=	"gc_interval",
2581
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_interval,
L
Linus Torvalds 已提交
2582 2583
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2584 2585
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2586 2587 2588 2589
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_ELASTICITY,
		.procname	=	"gc_elasticity",
2590
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
L
Linus Torvalds 已提交
2591 2592
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2593 2594
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2595 2596 2597 2598
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MTU_EXPIRES,
		.procname	=	"mtu_expires",
2599
		.data		=	&init_net.ipv6.sysctl.ip6_rt_mtu_expires,
L
Linus Torvalds 已提交
2600 2601
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2602 2603
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2604 2605 2606 2607
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MIN_ADVMSS,
		.procname	=	"min_adv_mss",
2608
		.data		=	&init_net.ipv6.sysctl.ip6_rt_min_advmss,
L
Linus Torvalds 已提交
2609 2610
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2611 2612
		.proc_handler	=	proc_dointvec_jiffies,
		.strategy	=	sysctl_jiffies,
L
Linus Torvalds 已提交
2613 2614 2615 2616
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
		.procname	=	"gc_min_interval_ms",
2617
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2618 2619
		.maxlen		=	sizeof(int),
		.mode		=	0644,
A
Alexey Dobriyan 已提交
2620 2621
		.proc_handler	=	proc_dointvec_ms_jiffies,
		.strategy	=	sysctl_ms_jiffies,
L
Linus Torvalds 已提交
2622 2623 2624 2625
	},
	{ .ctl_name = 0 }
};

2626 2627 2628 2629 2630 2631 2632
struct ctl_table *ipv6_route_sysctl_init(struct net *net)
{
	struct ctl_table *table;

	table = kmemdup(ipv6_route_table_template,
			sizeof(ipv6_route_table_template),
			GFP_KERNEL);
2633 2634 2635

	if (table) {
		table[0].data = &net->ipv6.sysctl.flush_delay;
2636
		table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh;
2637 2638 2639 2640 2641 2642 2643 2644 2645
		table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
		table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
		table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
		table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
		table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
		table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
		table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
	}

2646 2647
	return table;
}
L
Linus Torvalds 已提交
2648 2649
#endif

2650 2651
static int ip6_route_net_init(struct net *net)
{
2652
	int ret = -ENOMEM;
2653

2654 2655 2656 2657 2658
	net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
					sizeof(*net->ipv6.ip6_dst_ops),
					GFP_KERNEL);
	if (!net->ipv6.ip6_dst_ops)
		goto out;
2659
	net->ipv6.ip6_dst_ops->dst_net = hold_net(net);
2660

2661 2662 2663 2664
	net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
					   sizeof(*net->ipv6.ip6_null_entry),
					   GFP_KERNEL);
	if (!net->ipv6.ip6_null_entry)
2665
		goto out_ip6_dst_ops;
2666 2667
	net->ipv6.ip6_null_entry->u.dst.path =
		(struct dst_entry *)net->ipv6.ip6_null_entry;
2668
	net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2669 2670 2671 2672 2673

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
					       sizeof(*net->ipv6.ip6_prohibit_entry),
					       GFP_KERNEL);
2674 2675
	if (!net->ipv6.ip6_prohibit_entry)
		goto out_ip6_null_entry;
2676 2677
	net->ipv6.ip6_prohibit_entry->u.dst.path =
		(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2678
	net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2679 2680 2681 2682

	net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
					       sizeof(*net->ipv6.ip6_blk_hole_entry),
					       GFP_KERNEL);
2683 2684
	if (!net->ipv6.ip6_blk_hole_entry)
		goto out_ip6_prohibit_entry;
2685 2686
	net->ipv6.ip6_blk_hole_entry->u.dst.path =
		(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2687
	net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2688 2689
#endif

2690 2691 2692 2693 2694 2695 2696 2697 2698
	net->ipv6.sysctl.flush_delay = 0;
	net->ipv6.sysctl.ip6_rt_max_size = 4096;
	net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
	net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
	net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
	net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;

2699 2700 2701 2702
#ifdef CONFIG_PROC_FS
	proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
	proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
#endif
2703 2704
	net->ipv6.ip6_rt_gc_expire = 30*HZ;

2705 2706 2707
	ret = 0;
out:
	return ret;
2708

2709 2710 2711 2712 2713 2714
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
out_ip6_prohibit_entry:
	kfree(net->ipv6.ip6_prohibit_entry);
out_ip6_null_entry:
	kfree(net->ipv6.ip6_null_entry);
#endif
2715
out_ip6_dst_ops:
2716
	release_net(net->ipv6.ip6_dst_ops->dst_net);
2717 2718
	kfree(net->ipv6.ip6_dst_ops);
	goto out;
2719 2720 2721 2722 2723 2724 2725 2726
}

static void ip6_route_net_exit(struct net *net)
{
#ifdef CONFIG_PROC_FS
	proc_net_remove(net, "ipv6_route");
	proc_net_remove(net, "rt6_stats");
#endif
2727 2728 2729 2730 2731
	kfree(net->ipv6.ip6_null_entry);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	kfree(net->ipv6.ip6_prohibit_entry);
	kfree(net->ipv6.ip6_blk_hole_entry);
#endif
2732
	release_net(net->ipv6.ip6_dst_ops->dst_net);
2733
	kfree(net->ipv6.ip6_dst_ops);
2734 2735 2736 2737 2738 2739 2740
}

static struct pernet_operations ip6_route_net_ops = {
	.init = ip6_route_net_init,
	.exit = ip6_route_net_exit,
};

2741 2742 2743 2744 2745
static struct notifier_block ip6_route_dev_notifier = {
	.notifier_call = ip6_route_dev_notify,
	.priority = 0,
};

2746
int __init ip6_route_init(void)
L
Linus Torvalds 已提交
2747
{
2748 2749
	int ret;

2750 2751
	ret = -ENOMEM;
	ip6_dst_ops_template.kmem_cachep =
A
Alexey Dobriyan 已提交
2752
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2753
				  SLAB_HWCACHE_ALIGN, NULL);
2754
	if (!ip6_dst_ops_template.kmem_cachep)
2755
		goto out;
2756

2757 2758
	ret = register_pernet_subsys(&ip6_route_net_ops);
	if (ret)
2759 2760
		goto out_kmem_cache;

2761 2762
	ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;

2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
	/* Registering of the loopback is done before this portion of code,
	 * the loopback reference in rt6_info will not be taken, do it
	 * manually for init_net */
	init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
	init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
	init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
  #endif
2774 2775
	ret = fib6_init();
	if (ret)
2776
		goto out_register_subsys;
2777 2778 2779

	ret = xfrm6_init();
	if (ret)
2780
		goto out_fib6_init;
2781

2782 2783 2784
	ret = fib6_rules_init();
	if (ret)
		goto xfrm6_init;
2785

2786 2787 2788 2789 2790
	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;
2791

2792
	ret = register_netdevice_notifier(&ip6_route_dev_notifier);
2793 2794
	if (ret)
		goto fib6_rules_init;
2795

2796 2797 2798 2799 2800 2801 2802 2803 2804
out:
	return ret;

fib6_rules_init:
	fib6_rules_cleanup();
xfrm6_init:
	xfrm6_fini();
out_fib6_init:
	fib6_gc_cleanup();
2805 2806
out_register_subsys:
	unregister_pernet_subsys(&ip6_route_net_ops);
2807
out_kmem_cache:
2808
	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
2809
	goto out;
L
Linus Torvalds 已提交
2810 2811 2812 2813
}

void ip6_route_cleanup(void)
{
2814
	unregister_netdevice_notifier(&ip6_route_dev_notifier);
T
Thomas Graf 已提交
2815
	fib6_rules_cleanup();
L
Linus Torvalds 已提交
2816 2817
	xfrm6_fini();
	fib6_gc_cleanup();
2818
	unregister_pernet_subsys(&ip6_route_net_ops);
2819
	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
L
Linus Torvalds 已提交
2820
}