route.c 60.4 KB
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/*
 *	Linux INET6 implementation
 *	FIB front-end.
 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	$Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

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

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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/types.h>
#include <linux/times.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/route.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/init.h>
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <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
static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref);
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex);
#endif

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static struct dst_ops ip6_dst_ops = {
	.family			=	AF_INET6,
	.protocol		=	__constant_htons(ETH_P_IPV6),
	.gc			=	ip6_dst_gc,
	.gc_thresh		=	1024,
	.check			=	ip6_dst_check,
	.destroy		=	ip6_dst_destroy,
	.ifdown			=	ip6_dst_ifdown,
	.negative_advice	=	ip6_negative_advice,
	.link_failure		=	ip6_link_failure,
	.update_pmtu		=	ip6_rt_update_pmtu,
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	.local_out		=	ip6_local_out,
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	.entry_size		=	sizeof(struct rt6_info),
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	.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,
	.entry_size		=	sizeof(struct rt6_info),
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	.entries		=	ATOMIC_INIT(0),
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};

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

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#ifdef CONFIG_IPV6_MULTIPLE_TABLES

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

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

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

#endif

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

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

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

static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			   int how)
{
	struct rt6_info *rt = (struct rt6_info *)dst;
	struct inet6_dev *idev = rt->rt6i_idev;
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	struct net_device *loopback_dev =
		dev->nd_net->loopback_dev;
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	if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
		struct inet6_dev *loopback_idev =
			in6_dev_get(loopback_dev);
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		if (loopback_idev != NULL) {
			rt->rt6i_idev = loopback_idev;
			in6_dev_put(idev);
		}
	}
}

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

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

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

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

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

		if (local)
			return local;

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

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

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

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

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/*
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 * Default Router Selection (RFC 2461 6.3.6)
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 */
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static inline int rt6_check_dev(struct rt6_info *rt, int oif)
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{
	struct net_device *dev = rt->rt6i_dev;
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	if (!oif || dev->ifindex == oif)
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		return 2;
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	if ((dev->flags & IFF_LOOPBACK) &&
	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
		return 1;
	return 0;
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}
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static inline int rt6_check_neigh(struct rt6_info *rt)
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{
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	struct neighbour *neigh = rt->rt6i_nexthop;
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	int m;
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	if (rt->rt6i_flags & RTF_NONEXTHOP ||
	    !(rt->rt6i_flags & RTF_GATEWAY))
		m = 1;
	else if (neigh) {
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		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID)
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			m = 2;
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#ifdef CONFIG_IPV6_ROUTER_PREF
		else if (neigh->nud_state & NUD_FAILED)
			m = 0;
#endif
		else
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			m = 1;
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		read_unlock_bh(&neigh->lock);
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	} else
		m = 0;
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	return m;
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}

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

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

	if (rt6_check_expired(rt))
		goto out;

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

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

out:
	return match;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

}

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

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	dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_lookup);
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576 577 578 579 580
	if (dst->error == 0)
		return (struct rt6_info *) dst;

	dst_release(dst);

L
Linus Torvalds 已提交
581 582 583
	return NULL;
}

584 585
EXPORT_SYMBOL(rt6_lookup);

T
Thomas Graf 已提交
586
/* ip6_ins_rt is called with FREE table->tb6_lock.
L
Linus Torvalds 已提交
587 588 589 590 591
   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.
 */

592
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
593 594
{
	int err;
T
Thomas Graf 已提交
595
	struct fib6_table *table;
L
Linus Torvalds 已提交
596

T
Thomas Graf 已提交
597 598
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
599
	err = fib6_add(&table->tb6_root, rt, info);
T
Thomas Graf 已提交
600
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
601 602 603 604

	return err;
}

605 606
int ip6_ins_rt(struct rt6_info *rt)
{
607 608 609
	struct nl_info info = {
		.nl_net = &init_net,
	};
610
	return __ip6_ins_rt(rt, &info);
611 612
}

613 614
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
615 616 617 618 619 620 621 622 623 624
{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
625 626 627 628
		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
629
			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
630
		}
L
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631

632
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
L
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633 634 635 636 637 638 639 640 641 642 643 644 645
		rt->rt6i_dst.plen = 128;
		rt->rt6i_flags |= RTF_CACHE;
		rt->u.dst.flags |= DST_HOST;

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

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

646
	}
L
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647

648 649
	return rt;
}
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650

651 652 653 654 655 656 657 658 659 660 661 662 663
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;
}

664
static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif,
A
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					    struct flowi *fl, int flags)
L
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{
	struct fib6_node *fn;
668
	struct rt6_info *rt, *nrt;
T
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669
	int strict = 0;
L
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	int attempts = 3;
671
	int err;
672
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
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673

674
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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relookup:
T
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677
	read_lock_bh(&table->tb6_lock);
L
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678

679
restart_2:
T
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680
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
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restart:
683
	rt = rt6_select(fn, oif, strict | reachable);
684
	BACKTRACK(&fl->fl6_src);
685 686
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
687
		goto out;
L
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688

689
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
690
	read_unlock_bh(&table->tb6_lock);
691

692
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
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693
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
694 695
	else {
#if CLONE_OFFLINK_ROUTE
T
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696
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
697 698 699 700
#else
		goto out2;
#endif
	}
701

702 703
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
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705 706
	dst_hold(&rt->u.dst);
	if (nrt) {
707
		err = ip6_ins_rt(nrt);
708
		if (!err)
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			goto out2;
	}

712 713 714 715
	if (--attempts <= 0)
		goto out2;

	/*
T
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716
	 * Race condition! In the gap, when table->tb6_lock was
717 718 719 720 721 722
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
723 724 725 726
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
727
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
728
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
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out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
Thomas Graf 已提交
732 733

	return rt;
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}

736 737 738 739 740 741
static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
{
	return ip6_pol_route(table, fl->iif, fl, flags);
}

T
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742 743
void ip6_route_input(struct sk_buff *skb)
{
744
	struct ipv6hdr *iph = ipv6_hdr(skb);
745
	int flags = RT6_LOOKUP_F_HAS_SADDR;
T
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746 747 748 749 750 751
	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
A
Al Viro 已提交
752
				.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
T
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753 754
			},
		},
755
		.mark = skb->mark,
T
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756 757
		.proto = iph->nexthdr,
	};
758 759 760

	if (rt6_need_strict(&iph->daddr))
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
761

762
	skb->dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_input);
T
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763 764 765 766
}

static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
					     struct flowi *fl, int flags)
L
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767
{
768
	return ip6_pol_route(table, fl->oif, fl, flags);
T
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769 770 771 772 773 774 775
}

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

	if (rt6_need_strict(&fl->fl6_dst))
776
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
777

778 779 780
	if (!ipv6_addr_any(&fl->fl6_src))
		flags |= RT6_LOOKUP_F_HAS_SADDR;

781
	return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output);
L
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}

784
EXPORT_SYMBOL(ip6_route_output);
L
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785

786 787 788 789 790 791 792 793 794 795 796 797
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;
798 799
		new->input = dst_discard;
		new->output = dst_discard;
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827

		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
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828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
/*
 *	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)
850
			ip6_del_rt(rt);
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		else
			dst_release(dst);
	}
	return NULL;
}

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

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

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

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

	if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
		rt6->rt6i_flags |= RTF_MODIFIED;
		if (mtu < IPV6_MIN_MTU) {
			mtu = IPV6_MIN_MTU;
			dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
		}
		dst->metrics[RTAX_MTU-1] = mtu;
884
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
L
Linus Torvalds 已提交
885 886 887 888 889 890 891 892 893
	}
}

static int ipv6_get_mtu(struct net_device *dev);

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

894 895
	if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss)
		mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss;
L
Linus Torvalds 已提交
896 897

	/*
898 899 900
	 * 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
901 902 903 904 905 906 907
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

908 909
static struct dst_entry *icmp6_dst_gc_list;
static DEFINE_SPINLOCK(icmp6_dst_lock);
910

911
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
L
Linus Torvalds 已提交
912
				  struct neighbour *neigh,
913
				  struct in6_addr *addr)
L
Linus Torvalds 已提交
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
{
	struct rt6_info *rt;
	struct inet6_dev *idev = in6_dev_get(dev);

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

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

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

	rt->rt6i_dev	  = dev;
	rt->rt6i_idev     = idev;
	rt->rt6i_nexthop  = neigh;
	atomic_set(&rt->u.dst.__refcnt, 1);
	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
940
	rt->u.dst.output  = ip6_output;
L
Linus Torvalds 已提交
941 942

#if 0	/* there's no chance to use these for ndisc */
943 944
	rt->u.dst.flags   = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
				? DST_HOST
L
Linus Torvalds 已提交
945 946 947 948 949
				: 0;
	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
#endif

950 951 952 953
	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
954 955 956 957

	fib6_force_start_gc();

out:
958
	return &rt->u.dst;
L
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959 960
}

961
int icmp6_dst_gc(int *more)
L
Linus Torvalds 已提交
962 963 964 965 966
{
	struct dst_entry *dst, *next, **pprev;
	int freed;

	next = NULL;
967
	freed = 0;
968

969 970
	spin_lock_bh(&icmp6_dst_lock);
	pprev = &icmp6_dst_gc_list;
971

L
Linus Torvalds 已提交
972 973 974 975 976 977 978 979 980 981 982
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

983
	spin_unlock_bh(&icmp6_dst_lock);
984

L
Linus Torvalds 已提交
985 986 987
	return freed;
}

988
static int ip6_dst_gc(struct dst_ops *ops)
L
Linus Torvalds 已提交
989 990 991 992 993
{
	static unsigned expire = 30*HZ;
	static unsigned long last_gc;
	unsigned long now = jiffies;

994 995
	if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) &&
	    atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size)
L
Linus Torvalds 已提交
996 997 998
		goto out;

	expire++;
999
	fib6_run_gc(expire, &init_net);
L
Linus Torvalds 已提交
1000 1001
	last_gc = now;
	if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
1002
		expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1;
L
Linus Torvalds 已提交
1003 1004

out:
1005 1006
	expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity;
	return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size);
L
Linus Torvalds 已提交
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
}

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

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

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

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

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

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

/*
 *
 */

1045
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1046 1047 1048 1049 1050
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1051
	struct fib6_table *table;
L
Linus Torvalds 已提交
1052 1053
	int addr_type;

1054
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1055 1056
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1057
	if (cfg->fc_src_len)
L
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1058 1059
		return -EINVAL;
#endif
1060
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1061
		err = -ENODEV;
1062
		dev = dev_get_by_index(&init_net, cfg->fc_ifindex);
L
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1063 1064 1065 1066 1067 1068 1069
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1070 1071
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1072

1073
	table = fib6_new_table(&init_net, cfg->fc_table);
T
Thomas Graf 已提交
1074 1075 1076 1077 1078
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084 1085 1086
	rt = ip6_dst_alloc();

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

	rt->u.dst.obsolete = -1;
1087
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1088

1089 1090 1091 1092 1093
	if (cfg->fc_protocol == RTPROT_UNSPEC)
		cfg->fc_protocol = RTPROT_BOOT;
	rt->rt6i_protocol = cfg->fc_protocol;

	addr_type = ipv6_addr_type(&cfg->fc_dst);
L
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1094 1095 1096 1097 1098 1099 1100 1101

	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;

1102 1103
	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
L
Linus Torvalds 已提交
1104 1105 1106 1107
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1108 1109
	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
	rt->rt6i_src.plen = cfg->fc_src_len;
L
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#endif

1112
	rt->rt6i_metric = cfg->fc_metric;
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1113 1114 1115 1116

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1117
	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. */
1120
		if (dev != init_net.loopback_dev) {
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1121 1122 1123 1124
			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
1125
			dev = init_net.loopback_dev;
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			dev_hold(dev);
			idev = in6_dev_get(dev);
			if (!idev) {
				err = -ENODEV;
				goto out;
			}
		}
		rt->u.dst.output = ip6_pkt_discard_out;
		rt->u.dst.input = ip6_pkt_discard;
		rt->u.dst.error = -ENETUNREACH;
		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
		goto install_route;
	}

1140
	if (cfg->fc_flags & RTF_GATEWAY) {
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1141 1142 1143
		struct in6_addr *gw_addr;
		int gwa_type;

1144 1145
		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;

1162
			grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
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1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193

			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;

1194
	if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
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		rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
		if (IS_ERR(rt->rt6i_nexthop)) {
			err = PTR_ERR(rt->rt6i_nexthop);
			rt->rt6i_nexthop = NULL;
			goto out;
		}
	}

1203
	rt->rt6i_flags = cfg->fc_flags;
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1204 1205

install_route:
1206 1207 1208 1209 1210
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

		nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1211
			int type = nla_type(nla);
1212 1213 1214

			if (type) {
				if (type > RTAX_MAX) {
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					err = -EINVAL;
					goto out;
				}
1218 1219

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

	if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
		rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
	if (!rt->u.dst.metrics[RTAX_MTU-1])
		rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
	if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
	rt->u.dst.dev = dev;
	rt->rt6i_idev = idev;
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	rt->rt6i_table = table;
1233
	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
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1234 1235 1236 1237 1238 1239 1240

out:
	if (dev)
		dev_put(dev);
	if (idev)
		in6_dev_put(idev);
	if (rt)
1241
		dst_free(&rt->u.dst);
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1242 1243 1244
	return err;
}

1245
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
L
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1246 1247
{
	int err;
T
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1248
	struct fib6_table *table;
L
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1249

1250 1251 1252
	if (rt == &ip6_null_entry)
		return -ENOENT;

T
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1253 1254
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
L
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1255

1256
	err = fib6_del(rt, info);
L
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1257 1258
	dst_release(&rt->u.dst);

T
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1259
	write_unlock_bh(&table->tb6_lock);
L
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1260 1261 1262 1263

	return err;
}

1264 1265
int ip6_del_rt(struct rt6_info *rt)
{
1266 1267 1268
	struct nl_info info = {
		.nl_net = &init_net,
	};
1269
	return __ip6_del_rt(rt, &info);
1270 1271
}

1272
static int ip6_route_del(struct fib6_config *cfg)
L
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1273
{
T
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1274
	struct fib6_table *table;
L
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1275 1276 1277 1278
	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

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

	read_lock_bh(&table->tb6_lock);
L
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1284

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

L
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1289
	if (fn) {
1290
		for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1291
			if (cfg->fc_ifindex &&
L
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1292
			    (rt->rt6i_dev == NULL ||
1293
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
L
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1294
				continue;
1295 1296
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
L
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1297
				continue;
1298
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
L
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1299 1300
				continue;
			dst_hold(&rt->u.dst);
T
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1301
			read_unlock_bh(&table->tb6_lock);
L
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1302

1303
			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
L
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1304 1305
		}
	}
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1306
	read_unlock_bh(&table->tb6_lock);
L
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1307 1308 1309 1310 1311 1312 1313

	return err;
}

/*
 *	Handle redirects
 */
1314 1315 1316 1317 1318 1319 1320 1321
struct ip6rd_flowi {
	struct flowi fl;
	struct in6_addr gateway;
};

static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
					     struct flowi *fl,
					     int flags)
L
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{
1323 1324
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1325
	struct fib6_node *fn;
T
Thomas Graf 已提交
1326

L
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1327
	/*
1328 1329 1330 1331 1332 1333 1334 1335
	 * Get the "current" route for this destination and
	 * check if the redirect has come from approriate router.
	 *
	 * RFC 2461 specifies that redirects should only be
	 * accepted if they come from the nexthop to the target.
	 * Due to the way the routes are chosen, this notion
	 * is a bit fuzzy and one might need to check all possible
	 * routes.
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1336 1337
	 */

T
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1338
	read_lock_bh(&table->tb6_lock);
1339
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1340
restart:
1341
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
		/*
		 * Current route is on-link; redirect is always invalid.
		 *
		 * Seems, previous statement is not true. It could
		 * be node, which looks for us as on-link (f.e. proxy ndisc)
		 * But then router serving it might decide, that we should
		 * know truth 8)8) --ANK (980726).
		 */
		if (rt6_check_expired(rt))
			continue;
		if (!(rt->rt6i_flags & RTF_GATEWAY))
			continue;
1354
		if (fl->oif != rt->rt6i_dev->ifindex)
1355
			continue;
1356
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1357 1358 1359
			continue;
		break;
	}
1360

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

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

1369 1370 1371 1372 1373 1374 1375 1376
	return rt;
};

static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
					   struct in6_addr *src,
					   struct in6_addr *gateway,
					   struct net_device *dev)
{
1377
	int flags = RT6_LOOKUP_F_HAS_SADDR;
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1390 1391 1392

	if (rt6_need_strict(dest))
		flags |= RT6_LOOKUP_F_IFACE;
1393

1394 1395 1396
	return (struct rt6_info *)fib6_rule_lookup(&init_net,
						   (struct flowi *)&rdfl,
						   flags, __ip6_route_redirect);
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
}

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

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

	if (rt == &ip6_null_entry) {
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1409 1410 1411
		if (net_ratelimit())
			printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
			       "for redirect target\n");
1412
		goto out;
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1413 1414 1415 1416 1417 1418
	}

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

1419
	neigh_update(neigh, lladdr, NUD_STALE,
L
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1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
		     NEIGH_UPDATE_F_WEAK_OVERRIDE|
		     NEIGH_UPDATE_F_OVERRIDE|
		     (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
				     NEIGH_UPDATE_F_ISROUTER))
		     );

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

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

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

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

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

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

1455
	if (ip6_ins_rt(nrt))
L
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1456 1457
		goto out;

1458 1459 1460 1461
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

L
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1462
	if (rt->rt6i_flags&RTF_CACHE) {
1463
		ip6_del_rt(rt);
L
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1464 1465 1466 1467
		return;
	}

out:
1468
	dst_release(&rt->u.dst);
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1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
	return;
}

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

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

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

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

	if (pmtu < IPV6_MIN_MTU) {
		/*
1492
		 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
L
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1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
		 * 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;
1516
		dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
L
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1517 1518 1519 1520 1521 1522 1523 1524 1525
		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.
	 */
1526
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1527
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1528 1529
	else
		nrt = rt6_alloc_clone(rt, daddr);
1530

1531
	if (nrt) {
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541
		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.
		 */
1542
		dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
1543 1544
		nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;

1545
		ip6_ins_rt(nrt);
L
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1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
	}
out:
	dst_release(&rt->u.dst);
}

/*
 *	Misc support functions
 */

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

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

		memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1564
		rt->u.dst.error = ort->u.dst.error;
L
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1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
		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
1582
		rt->rt6i_table = ort->rt6i_table;
L
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1583 1584 1585 1586
	}
	return rt;
}

1587 1588 1589 1590 1591 1592
#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex)
{
	struct fib6_node *fn;
	struct rt6_info *rt = NULL;
T
Thomas Graf 已提交
1593 1594
	struct fib6_table *table;

1595
	table = fib6_get_table(&init_net, RT6_TABLE_INFO);
T
Thomas Graf 已提交
1596 1597
	if (table == NULL)
		return NULL;
1598

T
Thomas Graf 已提交
1599 1600
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1601 1602 1603
	if (!fn)
		goto out;

1604
	for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
		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
1615
	write_unlock_bh(&table->tb6_lock);
1616 1617 1618 1619 1620 1621 1622
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1623 1624
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_INFO,
1625
		.fc_metric	= IP6_RT_PRIO_USER,
1626 1627 1628 1629 1630 1631 1632 1633
		.fc_ifindex	= ifindex,
		.fc_dst_len	= prefixlen,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
				  RTF_UP | RTF_PREF(pref),
	};

	ipv6_addr_copy(&cfg.fc_dst, prefix);
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1634

1635 1636
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1637
		cfg.fc_flags |= RTF_DEFAULT;
1638

1639
	ip6_route_add(&cfg);
1640 1641 1642 1643 1644

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

L
Linus Torvalds 已提交
1645
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1646
{
L
Linus Torvalds 已提交
1647
	struct rt6_info *rt;
T
Thomas Graf 已提交
1648
	struct fib6_table *table;
L
Linus Torvalds 已提交
1649

1650
	table = fib6_get_table(&init_net, RT6_TABLE_DFLT);
T
Thomas Graf 已提交
1651 1652
	if (table == NULL)
		return NULL;
L
Linus Torvalds 已提交
1653

T
Thomas Graf 已提交
1654
	write_lock_bh(&table->tb6_lock);
1655
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1656
		if (dev == rt->rt6i_dev &&
1657
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
Linus Torvalds 已提交
1658 1659 1660 1661 1662
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1663
	write_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1664 1665 1666
	return rt;
}

F
Fred L. Templin 已提交
1667 1668
EXPORT_SYMBOL(rt6_get_dflt_router);

L
Linus Torvalds 已提交
1669
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1670 1671
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1672
{
1673 1674
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_DFLT,
1675
		.fc_metric	= IP6_RT_PRIO_USER,
1676 1677 1678 1679
		.fc_ifindex	= dev->ifindex,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
	};
L
Linus Torvalds 已提交
1680

1681
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
Linus Torvalds 已提交
1682

1683
	ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1684 1685 1686 1687 1688 1689 1690

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1691 1692 1693
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
1694
	table = fib6_get_table(&init_net, RT6_TABLE_DFLT);
T
Thomas Graf 已提交
1695 1696
	if (table == NULL)
		return;
L
Linus Torvalds 已提交
1697 1698

restart:
T
Thomas Graf 已提交
1699
	read_lock_bh(&table->tb6_lock);
1700
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
L
Linus Torvalds 已提交
1701 1702
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1703
			read_unlock_bh(&table->tb6_lock);
1704
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1705 1706 1707
			goto restart;
		}
	}
T
Thomas Graf 已提交
1708
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1709 1710
}

1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
				 struct fib6_config *cfg)
{
	memset(cfg, 0, sizeof(*cfg));

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

1724 1725
	cfg->fc_nlinfo.nl_net = &init_net;

1726 1727 1728 1729 1730
	ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
	ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
	ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
}

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

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

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
Linus Torvalds 已提交
1749 1750 1751
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1752
			err = ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1753 1754
			break;
		case SIOCDELRT:
1755
			err = ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1756 1757 1758 1759 1760 1761 1762
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
1763
	}
L
Linus Torvalds 已提交
1764 1765 1766 1767 1768 1769 1770 1771

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

I
Ilpo Järvinen 已提交
1772
static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
L
Linus Torvalds 已提交
1773
{
1774 1775 1776
	int type;
	switch (ipstats_mib_noroutes) {
	case IPSTATS_MIB_INNOROUTES:
1777
		type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1778 1779 1780 1781 1782 1783 1784 1785 1786
		if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
			IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
			break;
		}
		/* FALLTHROUGH */
	case IPSTATS_MIB_OUTNOROUTES:
		IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
		break;
	}
1787
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
L
Linus Torvalds 已提交
1788 1789 1790 1791
	kfree_skb(skb);
	return 0;
}

1792 1793
static int ip6_pkt_discard(struct sk_buff *skb)
{
1794
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1795 1796
}

1797
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1798 1799
{
	skb->dev = skb->dst->dev;
1800
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
L
Linus Torvalds 已提交
1801 1802
}

1803 1804
#ifdef CONFIG_IPV6_MULTIPLE_TABLES

1805 1806
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
1807
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1808 1809 1810 1811 1812
}

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb->dst->dev;
1813
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1814 1815
}

1816 1817
#endif

L
Linus Torvalds 已提交
1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
/*
 *	Allocate a dst for local (unicast / anycast) address.
 */

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

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

1831
	dev_hold(init_net.loopback_dev);
L
Linus Torvalds 已提交
1832 1833 1834 1835 1836
	in6_dev_hold(idev);

	rt->u.dst.flags = DST_HOST;
	rt->u.dst.input = ip6_input;
	rt->u.dst.output = ip6_output;
1837
	rt->rt6i_dev = init_net.loopback_dev;
L
Linus Torvalds 已提交
1838 1839 1840 1841 1842 1843 1844
	rt->rt6i_idev = idev;
	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
	rt->u.dst.obsolete = -1;

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1845 1846 1847
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1848 1849 1850
		rt->rt6i_flags |= RTF_LOCAL;
	rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
	if (rt->rt6i_nexthop == NULL) {
1851
		dst_free(&rt->u.dst);
L
Linus Torvalds 已提交
1852 1853 1854 1855 1856
		return ERR_PTR(-ENOMEM);
	}

	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
1857
	rt->rt6i_table = fib6_get_table(&init_net, RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873

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

	return rt;
}

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

1874
void rt6_ifdown(struct net *net, struct net_device *dev)
L
Linus Torvalds 已提交
1875
{
1876
	fib6_clean_all(net, fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
}

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

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

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

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

	/* For administrative MTU increase, there is no way to discover
	   IPv6 PMTU increase, so PMTU increase should be updated here.
	   Since RFC 1981 doesn't include administrative MTU increase
	   update PMTU increase is a MUST. (i.e. jumbo frame)
	 */
	/*
	   If new MTU is less than route PMTU, this new MTU will be the
	   lowest MTU in the path, update the route PMTU to reflect PMTU
	   decreases; if new MTU is greater than route PMTU, and the
	   old MTU is the lowest MTU in the path, update the route PMTU
	   to reflect the increase. In this case if the other nodes' MTU
	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
	   PMTU discouvery.
	 */
	if (rt->rt6i_dev == arg->dev &&
	    !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1916
	    (dst_mtu(&rt->u.dst) >= arg->mtu ||
1917
	     (dst_mtu(&rt->u.dst) < arg->mtu &&
1918
	      dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
L
Linus Torvalds 已提交
1919
		rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1920 1921
		rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
	}
L
Linus Torvalds 已提交
1922 1923 1924 1925 1926
	return 0;
}

void rt6_mtu_change(struct net_device *dev, unsigned mtu)
{
T
Thomas Graf 已提交
1927 1928 1929 1930
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1931

1932
	fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1933 1934
}

1935
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
1936
	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
1937
	[RTA_OIF]               = { .type = NLA_U32 },
1938
	[RTA_IIF]		= { .type = NLA_U32 },
1939 1940 1941 1942 1943 1944
	[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
1945
{
1946 1947 1948
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1949

1950 1951 1952
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1953

1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968
	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;
1969
	cfg->fc_nlinfo.nl_net = skb->sk->sk_net;
1970 1971 1972 1973

	if (tb[RTA_GATEWAY]) {
		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
		cfg->fc_flags |= RTF_GATEWAY;
L
Linus Torvalds 已提交
1974
	}
1975 1976 1977 1978 1979 1980 1981 1982

	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
1983
	}
1984 1985 1986 1987 1988 1989 1990 1991

	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
1992
	}
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002

	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
2003
	}
2004 2005 2006 2007 2008 2009 2010

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
2011 2012
}

2013
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2014
{
2015
	struct net *net = skb->sk->sk_net;
2016 2017
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2018

2019 2020 2021
	if (net != &init_net)
		return -EINVAL;

2022 2023 2024 2025 2026
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
2027 2028
}

2029
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2030
{
2031
	struct net *net = skb->sk->sk_net;
2032 2033
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2034

2035 2036 2037
	if (net != &init_net)
		return -EINVAL;

2038 2039 2040 2041 2042
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
2043 2044
}

2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055
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 */
2056
	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2057 2058 2059
	       + nla_total_size(sizeof(struct rta_cacheinfo));
}

L
Linus Torvalds 已提交
2060
static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2061 2062 2063
			 struct in6_addr *dst, struct in6_addr *src,
			 int iif, int type, u32 pid, u32 seq,
			 int prefix, unsigned int flags)
L
Linus Torvalds 已提交
2064 2065
{
	struct rtmsg *rtm;
2066
	struct nlmsghdr *nlh;
2067
	long expires;
2068
	u32 table;
L
Linus Torvalds 已提交
2069 2070 2071 2072 2073 2074 2075 2076

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

2077 2078
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
	if (nlh == NULL)
2079
		return -EMSGSIZE;
2080 2081

	rtm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
2082 2083 2084 2085
	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
2086
	if (rt->rt6i_table)
2087
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
2088
	else
2089 2090
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2091
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111
	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) {
2112
		NLA_PUT(skb, RTA_DST, 16, dst);
2113
		rtm->rtm_dst_len = 128;
L
Linus Torvalds 已提交
2114
	} else if (rtm->rtm_dst_len)
2115
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2116 2117
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2118
		NLA_PUT(skb, RTA_SRC, 16, src);
2119
		rtm->rtm_src_len = 128;
L
Linus Torvalds 已提交
2120
	} else if (rtm->rtm_src_len)
2121
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2122 2123
#endif
	if (iif)
2124
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
Linus Torvalds 已提交
2125 2126
	else if (dst) {
		struct in6_addr saddr_buf;
2127 2128
		if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
				       dst, &saddr_buf) == 0)
2129
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2130
	}
2131

L
Linus Torvalds 已提交
2132
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2133 2134
		goto nla_put_failure;

L
Linus Torvalds 已提交
2135
	if (rt->u.dst.neighbour)
2136 2137
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2138
	if (rt->u.dst.dev)
2139 2140 2141
		NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);

	NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2142 2143 2144 2145 2146

	expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
	if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
			       expires, rt->u.dst.error) < 0)
		goto nla_put_failure;
2147 2148 2149 2150

	return nlmsg_end(skb, nlh);

nla_put_failure:
2151 2152
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
2153 2154
}

2155
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2156 2157 2158 2159
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2160 2161
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2162 2163 2164 2165 2166 2167
		prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
	} else
		prefix = 0;

	return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
		     NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2168
		     prefix, NLM_F_MULTI);
L
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2169 2170
}

2171
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
L
Linus Torvalds 已提交
2172
{
2173
	struct net *net = in_skb->sk->sk_net;
2174 2175
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
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2176
	struct sk_buff *skb;
2177
	struct rtmsg *rtm;
L
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2178
	struct flowi fl;
2179
	int err, iif = 0;
L
Linus Torvalds 已提交
2180

2181 2182 2183
	if (net != &init_net)
		return -EINVAL;

2184 2185 2186
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2187

2188
	err = -EINVAL;
L
Linus Torvalds 已提交
2189 2190
	memset(&fl, 0, sizeof(fl));

2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
	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
2210 2211 2212

	if (iif) {
		struct net_device *dev;
2213
		dev = __dev_get_by_index(&init_net, iif);
L
Linus Torvalds 已提交
2214 2215
		if (!dev) {
			err = -ENODEV;
2216
			goto errout;
L
Linus Torvalds 已提交
2217 2218 2219
		}
	}

2220 2221 2222 2223 2224
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
L
Linus Torvalds 已提交
2225

2226 2227 2228
	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
2229
	skb_reset_mac_header(skb);
2230
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
L
Linus Torvalds 已提交
2231

2232
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
L
Linus Torvalds 已提交
2233 2234
	skb->dst = &rt->u.dst;

2235
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
Linus Torvalds 已提交
2236
			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2237
			    nlh->nlmsg_seq, 0, 0);
L
Linus Torvalds 已提交
2238
	if (err < 0) {
2239 2240
		kfree_skb(skb);
		goto errout;
L
Linus Torvalds 已提交
2241 2242
	}

2243
	err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
2244
errout:
L
Linus Torvalds 已提交
2245 2246 2247
	return err;
}

2248
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
L
Linus Torvalds 已提交
2249 2250
{
	struct sk_buff *skb;
2251 2252 2253 2254 2255
	u32 seq;
	int err;

	err = -ENOBUFS;
	seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
2256

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

2261 2262
	err = rt6_fill_node(skb, rt, NULL, NULL, 0,
				event, info->pid, seq, 0, 0);
2263 2264 2265 2266 2267 2268
	if (err < 0) {
		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
2269 2270
	err = rtnl_notify(skb, &init_net, info->pid,
				RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any());
2271 2272
errout:
	if (err < 0)
2273
		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err);
L
Linus Torvalds 已提交
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294
}

/*
 *	/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)
{
2295
	struct seq_file *m = p_arg;
L
Linus Torvalds 已提交
2296

2297 2298
	seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
		   rt->rt6i_dst.plen);
L
Linus Torvalds 已提交
2299 2300

#ifdef CONFIG_IPV6_SUBTREES
2301 2302
	seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
		   rt->rt6i_src.plen);
L
Linus Torvalds 已提交
2303
#else
2304
	seq_puts(m, "00000000000000000000000000000000 00 ");
L
Linus Torvalds 已提交
2305 2306 2307
#endif

	if (rt->rt6i_nexthop) {
2308 2309
		seq_printf(m, NIP6_SEQFMT,
			   NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
L
Linus Torvalds 已提交
2310
	} else {
2311
		seq_puts(m, "00000000000000000000000000000000");
L
Linus Torvalds 已提交
2312
	}
2313 2314 2315 2316
	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
2317 2318 2319
	return 0;
}

2320
static int ipv6_route_show(struct seq_file *m, void *v)
L
Linus Torvalds 已提交
2321
{
2322 2323
	struct net *net = (struct net *)m->private;
	fib6_clean_all(net, rt6_info_route, 0, m);
2324 2325
	return 0;
}
L
Linus Torvalds 已提交
2326

2327 2328
static int ipv6_route_open(struct inode *inode, struct file *file)
{
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340
	struct net *net = get_proc_net(inode);
	if (!net)
		return -ENXIO;
	return single_open(file, ipv6_route_show, net);
}

static int ipv6_route_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct net *net = seq->private;
	put_net(net);
	return single_release(inode, file);
L
Linus Torvalds 已提交
2341 2342
}

2343 2344 2345 2346 2347
static const struct file_operations ipv6_route_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= ipv6_route_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2348
	.release	= ipv6_route_release,
2349 2350
};

L
Linus Torvalds 已提交
2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
{
	seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
		      rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
		      rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
		      rt6_stats.fib_rt_cache,
		      atomic_read(&ip6_dst_ops.entries),
		      rt6_stats.fib_discarded_routes);

	return 0;
}

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

2368
static const struct file_operations rt6_stats_seq_fops = {
L
Linus Torvalds 已提交
2369 2370 2371 2372 2373 2374
	.owner	 = THIS_MODULE,
	.open	 = rt6_stats_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = single_release,
};
2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408

static int ipv6_route_proc_init(struct net *net)
{
	int ret = -ENOMEM;
	if (!proc_net_fops_create(net, "ipv6_route",
				  0, &ipv6_route_proc_fops))
		goto out;

	if (!proc_net_fops_create(net, "rt6_stats",
				  S_IRUGO, &rt6_stats_seq_fops))
		goto out_ipv6_route;

	ret = 0;
out:
	return ret;
out_ipv6_route:
	proc_net_remove(net, "ipv6_route");
	goto out;
}

static void ipv6_route_proc_fini(struct net *net)
{
	proc_net_remove(net, "ipv6_route");
	proc_net_remove(net, "rt6_stats");
}
#else
static inline int ipv6_route_proc_init(struct net *net)
{
	return 0;
}
static inline void ipv6_route_proc_fini(struct net *net)
{
	return ;
}
L
Linus Torvalds 已提交
2409 2410 2411 2412 2413 2414 2415 2416
#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)
{
2417 2418
	struct net *net = current->nsproxy->net_ns;
	int delay = net->ipv6.sysctl.flush_delay;
L
Linus Torvalds 已提交
2419 2420
	if (write) {
		proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2421
		fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
L
Linus Torvalds 已提交
2422 2423 2424 2425 2426
		return 0;
	} else
		return -EINVAL;
}

2427
ctl_table ipv6_route_table_template[] = {
2428
	{
L
Linus Torvalds 已提交
2429
		.procname	=	"flush",
2430
		.data		=	&init_net.ipv6.sysctl.flush_delay,
L
Linus Torvalds 已提交
2431
		.maxlen		=	sizeof(int),
2432
		.mode		=	0200,
2433
		.proc_handler	=	&ipv6_sysctl_rtcache_flush
L
Linus Torvalds 已提交
2434 2435 2436 2437
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_THRESH,
		.procname	=	"gc_thresh",
2438
		.data		=	&ip6_dst_ops.gc_thresh,
L
Linus Torvalds 已提交
2439 2440
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2441
		.proc_handler	=	&proc_dointvec,
L
Linus Torvalds 已提交
2442 2443 2444 2445
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MAX_SIZE,
		.procname	=	"max_size",
2446
		.data		=	&init_net.ipv6.sysctl.ip6_rt_max_size,
L
Linus Torvalds 已提交
2447 2448
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2449
		.proc_handler	=	&proc_dointvec,
L
Linus Torvalds 已提交
2450 2451 2452 2453
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL,
		.procname	=	"gc_min_interval",
2454
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2455 2456
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2457
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2458 2459 2460 2461 2462
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_TIMEOUT,
		.procname	=	"gc_timeout",
2463
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_timeout,
L
Linus Torvalds 已提交
2464 2465
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2466
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2467 2468 2469 2470 2471
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_INTERVAL,
		.procname	=	"gc_interval",
2472
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_interval,
L
Linus Torvalds 已提交
2473 2474
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2475
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2476 2477 2478 2479 2480
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_ELASTICITY,
		.procname	=	"gc_elasticity",
2481
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
L
Linus Torvalds 已提交
2482 2483
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2484
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2485 2486 2487 2488 2489
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MTU_EXPIRES,
		.procname	=	"mtu_expires",
2490
		.data		=	&init_net.ipv6.sysctl.ip6_rt_mtu_expires,
L
Linus Torvalds 已提交
2491 2492
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2493
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2494 2495 2496 2497 2498
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MIN_ADVMSS,
		.procname	=	"min_adv_mss",
2499
		.data		=	&init_net.ipv6.sysctl.ip6_rt_min_advmss,
L
Linus Torvalds 已提交
2500 2501
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2502
		.proc_handler	=	&proc_dointvec_jiffies,
L
Linus Torvalds 已提交
2503 2504 2505 2506 2507
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
		.procname	=	"gc_min_interval_ms",
2508
		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
L
Linus Torvalds 已提交
2509 2510
		.maxlen		=	sizeof(int),
		.mode		=	0644,
2511
		.proc_handler	=	&proc_dointvec_ms_jiffies,
L
Linus Torvalds 已提交
2512 2513 2514 2515 2516
		.strategy	=	&sysctl_ms_jiffies,
	},
	{ .ctl_name = 0 }
};

2517 2518 2519 2520 2521 2522 2523
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);
2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537

	if (table) {
		table[0].data = &net->ipv6.sysctl.flush_delay;
		/* table[1].data will be handled when we have
		   routes per namespace */
		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;
	}

2538 2539
	return table;
}
L
Linus Torvalds 已提交
2540 2541
#endif

2542
int __init ip6_route_init(void)
L
Linus Torvalds 已提交
2543
{
2544 2545
	int ret;

A
Alexey Dobriyan 已提交
2546 2547
	ip6_dst_ops.kmem_cachep =
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2548 2549 2550 2551
				  SLAB_HWCACHE_ALIGN, NULL);
	if (!ip6_dst_ops.kmem_cachep)
		return -ENOMEM;

2552 2553
	ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;

2554 2555 2556 2557
	ret = fib6_init();
	if (ret)
		goto out_kmem_cache;

2558 2559
	ret = ipv6_route_proc_init(&init_net);
	if (ret)
2560 2561 2562 2563
		goto out_fib6_init;

	ret = xfrm6_init();
	if (ret)
2564
		goto out_proc_init;
2565

2566 2567 2568
	ret = fib6_rules_init();
	if (ret)
		goto xfrm6_init;
2569

2570 2571 2572 2573 2574
	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;
2575

2576 2577 2578 2579 2580 2581 2582 2583
	ret = 0;
out:
	return ret;

fib6_rules_init:
	fib6_rules_cleanup();
xfrm6_init:
	xfrm6_fini();
2584 2585
out_proc_init:
	ipv6_route_proc_fini(&init_net);
2586
out_fib6_init:
2587
	rt6_ifdown(&init_net, NULL);
2588 2589 2590 2591
	fib6_gc_cleanup();
out_kmem_cache:
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
	goto out;
L
Linus Torvalds 已提交
2592 2593 2594 2595
}

void ip6_route_cleanup(void)
{
T
Thomas Graf 已提交
2596
	fib6_rules_cleanup();
2597
	ipv6_route_proc_fini(&init_net);
L
Linus Torvalds 已提交
2598
	xfrm6_fini();
2599
	rt6_ifdown(&init_net, NULL);
L
Linus Torvalds 已提交
2600 2601 2602
	fib6_gc_cleanup();
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
}