route.c 55.8 KB
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/*
 *	Linux INET6 implementation
 *	FIB front-end.
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>	
 *
 *	$Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

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

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

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

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

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

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

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

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

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

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

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

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

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

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#ifdef CONFIG_IPV6_MULTIPLE_TABLES

struct rt6_info ip6_prohibit_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.dev		= &loopback_dev,
			.obsolete	= -1,
			.error		= -EACCES,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
			.input		= ip6_pkt_discard,
			.output		= ip6_pkt_discard_out,
			.ops		= &ip6_dst_ops,
			.path		= (struct dst_entry*)&ip6_prohibit_entry,
		}
	},
	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
	.rt6i_metric	= ~(u32) 0,
	.rt6i_ref	= ATOMIC_INIT(1),
};

struct rt6_info ip6_blk_hole_entry = {
	.u = {
		.dst = {
			.__refcnt	= ATOMIC_INIT(1),
			.__use		= 1,
			.dev		= &loopback_dev,
			.obsolete	= -1,
			.error		= -EINVAL,
			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
			.input		= ip6_pkt_discard,
			.output		= ip6_pkt_discard_out,
			.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);
	}	
}

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

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

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

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

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

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

	if (oif) {
		for (sprt = rt; sprt; sprt = sprt->u.next) {
			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;
					if (local && (!oif || 
						      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 int inline rt6_check_dev(struct rt6_info *rt, int oif)
{
	struct net_device *dev = rt->rt6i_dev;
	if (!oif || dev->ifindex == oif)
		return 2;
	if ((dev->flags & IFF_LOOPBACK) &&
	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
		return 1;
	return 0;
}
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static int inline rt6_check_neigh(struct rt6_info *rt)
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{
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	struct neighbour *neigh = rt->rt6i_nexthop;
	int m = 0;
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	if (rt->rt6i_flags & RTF_NONEXTHOP ||
	    !(rt->rt6i_flags & RTF_GATEWAY))
		m = 1;
	else if (neigh) {
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		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID)
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			m = 2;
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		read_unlock_bh(&neigh->lock);
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	}
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	return m;
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}

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static int rt6_score_route(struct rt6_info *rt, int oif,
			   int strict)
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{
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	int m, n;
		
	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);
	if (n > 1)
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		m |= 16;
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	else if (!n && strict & RT6_LOOKUP_F_REACHABLE)
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		return -1;
	return m;
}

static struct rt6_info *rt6_select(struct rt6_info **head, int oif,
				   int strict)
{
	struct rt6_info *match = NULL, *last = NULL;
	struct rt6_info *rt, *rt0 = *head;
	u32 metric;
	int mpri = -1;
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	RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n",
		  __FUNCTION__, head, head ? *head : NULL, oif);
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	for (rt = rt0, metric = rt0->rt6i_metric;
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	     rt && rt->rt6i_metric == metric && (!last || rt != rt0);
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	     rt = rt->u.next) {
		int m;
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		if (rt6_check_expired(rt))
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			continue;

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		last = rt;

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

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		if (m > mpri) {
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			rt6_probe(match);
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			match = rt;
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			mpri = m;
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		} else {
			rt6_probe(rt);
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		}
	}

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	if (!match &&
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	    (strict & RT6_LOOKUP_F_REACHABLE) &&
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	    last && last != rt0) {
		/* no entries matched; do round-robin */
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		static DEFINE_SPINLOCK(lock);
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		spin_lock(&lock);
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		*head = rt0->u.next;
		rt0->u.next = last->u.next;
		last->u.next = rt0;
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		spin_unlock(&lock);
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	}

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	RT6_TRACE("%s() => %p, score=%d\n",
		  __FUNCTION__, match, mpri);
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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;

	lifetime = htonl(rinfo->lifetime);
	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; \
		while (fn) { \
			if (fn->fn_flags & RTN_TL_ROOT) \
				goto out; \
			pn = fn->parent; \
			if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
				fn = fib6_lookup(pn->subtree, NULL, saddr); \
			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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	dst_hold(&rt->u.dst);
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out:
	read_unlock_bh(&table->tb6_lock);
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	rt->u.dst.lastuse = jiffies;
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	rt->u.dst.__use++;

	return rt;

}

struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
			    int oif, int strict)
{
	struct flowi fl = {
		.oif = oif,
		.nl_u = {
			.ip6_u = {
				.daddr = *daddr,
				/* TODO: saddr */
			},
		},
	};
	struct dst_entry *dst;
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	int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
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	dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
	if (dst->error == 0)
		return (struct rt6_info *) dst;

	dst_release(dst);

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	return NULL;
}

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

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static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
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{
	int err;
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	struct fib6_table *table;
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	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
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	err = fib6_add(&table->tb6_root, rt, info);
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	write_unlock_bh(&table->tb6_lock);
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	return err;
}

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int ip6_ins_rt(struct rt6_info *rt)
{
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	return __ip6_ins_rt(rt, NULL);
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}

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

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
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		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;
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			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
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		}
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591
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
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		rt->rt6i_dst.plen = 128;
		rt->rt6i_flags |= RTF_CACHE;
		rt->u.dst.flags |= DST_HOST;

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

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

605
	}
L
Linus Torvalds 已提交
606

607 608
	return rt;
}
L
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609

610 611 612 613 614 615 616 617 618 619 620 621 622 623 624
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;
		if (rt->rt6i_flags & RTF_REJECT)
			rt->u.dst.error = ort->u.dst.error;
		rt->u.dst.flags |= DST_HOST;
		rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
	}
	return rt;
}

A
Adrian Bunk 已提交
625 626
static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
L
Linus Torvalds 已提交
627 628
{
	struct fib6_node *fn;
629
	struct rt6_info *rt, *nrt;
T
Thomas Graf 已提交
630
	int strict = 0;
L
Linus Torvalds 已提交
631
	int attempts = 3;
632
	int err;
633
	int reachable = RT6_LOOKUP_F_REACHABLE;
L
Linus Torvalds 已提交
634

635
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
Linus Torvalds 已提交
636 637

relookup:
T
Thomas Graf 已提交
638
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
639

640
restart_2:
T
Thomas Graf 已提交
641
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
642 643

restart:
T
Thomas Graf 已提交
644
	rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);
645
	BACKTRACK(&fl->fl6_src);
646 647
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
648
		goto out;
L
Linus Torvalds 已提交
649

650
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
651
	read_unlock_bh(&table->tb6_lock);
652

653
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
Thomas Graf 已提交
654
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
655 656
	else {
#if CLONE_OFFLINK_ROUTE
T
Thomas Graf 已提交
657
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
658 659 660 661
#else
		goto out2;
#endif
	}
662

663 664
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
Linus Torvalds 已提交
665

666 667
	dst_hold(&rt->u.dst);
	if (nrt) {
668
		err = ip6_ins_rt(nrt);
669
		if (!err)
L
Linus Torvalds 已提交
670 671 672
			goto out2;
	}

673 674 675 676
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
677
	 * Race condition! In the gap, when table->tb6_lock was
678 679 680 681 682 683
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
684 685 686 687
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
688
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
689
	read_unlock_bh(&table->tb6_lock);
L
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out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
Thomas Graf 已提交
693 694

	return rt;
L
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}

T
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697 698 699 700 701 702 703 704 705
void ip6_route_input(struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
706
#ifdef CONFIG_IPV6_ROUTE_FWMARK
707
				.fwmark = skb->nfmark,
708
#endif
T
Thomas Graf 已提交
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				.flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK,
			},
		},
		.proto = iph->nexthdr,
	};
714
	int flags = rt6_need_strict(&iph->daddr) ? RT6_LOOKUP_F_IFACE : 0;
T
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	skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
}

static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
					     struct flowi *fl, int flags)
L
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{
	struct fib6_node *fn;
723
	struct rt6_info *rt, *nrt;
T
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724
	int strict = 0;
L
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725
	int attempts = 3;
726
	int err;
727
	int reachable = RT6_LOOKUP_F_REACHABLE;
L
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728

729
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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relookup:
T
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732
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
733

734
restart_2:
T
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735
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
736 737

restart:
738
	rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
739
	BACKTRACK(&fl->fl6_src);
740 741
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
L
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742 743
		goto out;

744
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
745
	read_unlock_bh(&table->tb6_lock);
746

747
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
748
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
749 750 751 752 753 754 755
	else {
#if CLONE_OFFLINK_ROUTE
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
#else
		goto out2;
#endif
	}
L
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756

757 758
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
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760 761
	dst_hold(&rt->u.dst);
	if (nrt) {
762
		err = ip6_ins_rt(nrt);
763
		if (!err)
L
Linus Torvalds 已提交
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			goto out2;
	}
766

767 768 769 770
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
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	 * Race condition! In the gap, when table->tb6_lock was
772 773 774 775 776 777
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
778 779 780 781
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
782
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
783
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
784 785 786
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
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787 788 789 790 791 792 793 794
	return rt;
}

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

	if (rt6_need_strict(&fl->fl6_dst))
795
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
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	return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
L
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}


/*
 *	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)
823
			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;
857
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
L
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858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
	}
}

static int ipv6_get_mtu(struct net_device *dev);

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

	if (mtu < ip6_rt_min_advmss)
		mtu = ip6_rt_min_advmss;

	/*
	 * 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, 
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

881
static struct dst_entry *ndisc_dst_gc_list;
A
Adrian Bunk 已提交
882
static DEFINE_SPINLOCK(ndisc_lock);
883

L
Linus Torvalds 已提交
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
struct dst_entry *ndisc_dst_alloc(struct net_device *dev, 
				  struct neighbour *neigh,
				  struct in6_addr *addr,
				  int (*output)(struct sk_buff *))
{
	struct rt6_info *rt;
	struct inet6_dev *idev = in6_dev_get(dev);

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

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

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

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

#if 0	/* there's no chance to use these for ndisc */
	rt->u.dst.flags   = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST 
				? DST_HOST 
				: 0;
	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
#endif

924
	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
925 926
	rt->u.dst.next = ndisc_dst_gc_list;
	ndisc_dst_gc_list = &rt->u.dst;
927
	spin_unlock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
928 929 930 931 932 933 934 935 936 937 938 939 940

	fib6_force_start_gc();

out:
	return (struct dst_entry *)rt;
}

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

	next = NULL;
941 942 943
 	freed = 0;

	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
944
	pprev = &ndisc_dst_gc_list;
945

L
Linus Torvalds 已提交
946 947 948 949 950 951 952 953 954 955 956
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

957 958
	spin_unlock_bh(&ndisc_lock);

L
Linus Torvalds 已提交
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	return freed;
}

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

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

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

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

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

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

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

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

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

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

/*
 *
 */

1019
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1020 1021 1022 1023 1024
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1025
	struct fib6_table *table;
L
Linus Torvalds 已提交
1026 1027
	int addr_type;

1028
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1029 1030
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1031
	if (cfg->fc_src_len)
L
Linus Torvalds 已提交
1032 1033
		return -EINVAL;
#endif
1034
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1035
		err = -ENODEV;
1036
		dev = dev_get_by_index(cfg->fc_ifindex);
L
Linus Torvalds 已提交
1037 1038 1039 1040 1041 1042 1043
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1044 1045
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1046

1047
	table = fib6_new_table(cfg->fc_table);
T
Thomas Graf 已提交
1048 1049 1050 1051 1052
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
Linus Torvalds 已提交
1053 1054 1055 1056 1057 1058 1059 1060
	rt = ip6_dst_alloc();

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

	rt->u.dst.obsolete = -1;
1061
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1062

1063 1064 1065 1066 1067
	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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1068 1069 1070 1071 1072 1073 1074 1075

	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;

1076 1077
	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
L
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1078 1079 1080 1081
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1082 1083
	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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1084 1085
#endif

1086
	rt->rt6i_metric = cfg->fc_metric;
L
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1087 1088 1089 1090

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1091
	if ((cfg->fc_flags & RTF_REJECT) ||
L
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1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
	    (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
		/* hold loopback dev/idev if we haven't done so. */
		if (dev != &loopback_dev) {
			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
			dev = &loopback_dev;
			dev_hold(dev);
			idev = in6_dev_get(dev);
			if (!idev) {
				err = -ENODEV;
				goto out;
			}
		}
		rt->u.dst.output = ip6_pkt_discard_out;
		rt->u.dst.input = ip6_pkt_discard;
		rt->u.dst.error = -ENETUNREACH;
		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
		goto install_route;
	}

1114
	if (cfg->fc_flags & RTF_GATEWAY) {
L
Linus Torvalds 已提交
1115 1116 1117
		struct in6_addr *gw_addr;
		int gwa_type;

1118 1119
		gw_addr = &cfg->fc_gateway;
		ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
L
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1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
		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;

1136
			grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
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			err = -EHOSTUNREACH;
			if (grt == NULL)
				goto out;
			if (dev) {
				if (dev != grt->rt6i_dev) {
					dst_release(&grt->u.dst);
					goto out;
				}
			} else {
				dev = grt->rt6i_dev;
				idev = grt->rt6i_idev;
				dev_hold(dev);
				in6_dev_hold(grt->rt6i_idev);
			}
			if (!(grt->rt6i_flags&RTF_GATEWAY))
				err = 0;
			dst_release(&grt->u.dst);

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

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

1168
	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;
		}
	}

1177
	rt->rt6i_flags = cfg->fc_flags;
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install_route:
1180 1181 1182 1183 1184 1185 1186 1187 1188
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

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

			if (type) {
				if (type > RTAX_MAX) {
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					err = -EINVAL;
					goto out;
				}
1192 1193

				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;
1207
	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
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out:
	if (dev)
		dev_put(dev);
	if (idev)
		in6_dev_put(idev);
	if (rt)
		dst_free((struct dst_entry *) rt);
	return err;
}

1219
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
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{
	int err;
T
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1222
	struct fib6_table *table;
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1223

1224 1225 1226
	if (rt == &ip6_null_entry)
		return -ENOENT;

T
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1227 1228
	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
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1229

1230
	err = fib6_del(rt, info);
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	dst_release(&rt->u.dst);

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

1238 1239
int ip6_del_rt(struct rt6_info *rt)
{
1240
	return __ip6_del_rt(rt, NULL);
1241 1242
}

1243
static int ip6_route_del(struct fib6_config *cfg)
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1244
{
T
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	struct fib6_table *table;
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	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1250
	table = fib6_get_table(cfg->fc_table);
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	if (table == NULL)
		return err;

	read_lock_bh(&table->tb6_lock);
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T
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	fn = fib6_locate(&table->tb6_root,
1257 1258
			 &cfg->fc_dst, cfg->fc_dst_len,
			 &cfg->fc_src, cfg->fc_src_len);
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	if (fn) {
		for (rt = fn->leaf; rt; rt = rt->u.next) {
1262
			if (cfg->fc_ifindex &&
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			    (rt->rt6i_dev == NULL ||
1264
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
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				continue;
1266 1267
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
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				continue;
1269
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
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				continue;
			dst_hold(&rt->u.dst);
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			read_unlock_bh(&table->tb6_lock);
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1274
			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
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		}
	}
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	read_unlock_bh(&table->tb6_lock);
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	return err;
}

/*
 *	Handle redirects
 */
1285 1286 1287 1288 1289 1290 1291 1292
struct ip6rd_flowi {
	struct flowi fl;
	struct in6_addr gateway;
};

static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
					     struct flowi *fl,
					     int flags)
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{
1294 1295
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1296
	struct fib6_node *fn;
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	/*
1299 1300 1301 1302 1303 1304 1305 1306
	 * Get the "current" route for this destination and
	 * check if the redirect has come from approriate router.
	 *
	 * RFC 2461 specifies that redirects should only be
	 * accepted if they come from the nexthop to the target.
	 * Due to the way the routes are chosen, this notion
	 * is a bit fuzzy and one might need to check all possible
	 * routes.
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	 */

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	read_lock_bh(&table->tb6_lock);
1310
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
restart:
	for (rt = fn->leaf; rt; rt = rt->u.next) {
		/*
		 * 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;
1325
		if (fl->oif != rt->rt6i_dev->ifindex)
1326
			continue;
1327
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1328 1329 1330
			continue;
		break;
	}
1331

1332
	if (!rt)
1333
		rt = &ip6_null_entry;
1334 1335
	BACKTRACK(&fl->fl6_src);
out:
1336 1337
	dst_hold(&rt->u.dst);

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	read_unlock_bh(&table->tb6_lock);
1339

1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
	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)
{
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1360
	int flags = rt6_need_strict(dest) ? RT6_LOOKUP_F_IFACE : 0;
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374

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

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

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

	if (rt == &ip6_null_entry) {
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		if (net_ratelimit())
			printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
			       "for redirect target\n");
1378
		goto out;
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	}

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

	neigh_update(neigh, lladdr, NUD_STALE, 
		     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));

1421
	if (ip6_ins_rt(nrt))
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		goto out;

1424 1425 1426 1427
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

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1428
	if (rt->rt6i_flags&RTF_CACHE) {
1429
		ip6_del_rt(rt);
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		return;
	}

out:
        dst_release(&rt->u.dst);
	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) {
		/*
		 * According to RFC2460, PMTU is set to the IPv6 Minimum Link 
		 * MTU (1280) and a fragment header should always be included
		 * after a node receiving Too Big message reporting PMTU is
		 * less than the IPv6 Minimum Link MTU.
		 */
		pmtu = IPV6_MIN_MTU;
		allfrag = 1;
	}

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

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

	/* Network route.
	   Two cases are possible:
	   1. It is connected route. Action: COW
	   2. It is gatewayed route or NONEXTHOP route. Action: clone it.
	 */
1492
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1493
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1494 1495
	else
		nrt = rt6_alloc_clone(rt, daddr);
1496

1497
	if (nrt) {
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
		nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
		if (allfrag)
			nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;

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

1511
		ip6_ins_rt(nrt);
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1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
	}
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));
		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
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Thomas Graf 已提交
1547
		rt->rt6i_table = ort->rt6i_table;
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1548 1549 1550 1551
	}
	return rt;
}

1552 1553 1554 1555 1556 1557
#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
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1558 1559 1560 1561 1562
	struct fib6_table *table;

	table = fib6_get_table(RT6_TABLE_INFO);
	if (table == NULL)
		return NULL;
1563

T
Thomas Graf 已提交
1564 1565
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
	if (!fn)
		goto out;

	for (rt = fn->leaf; rt; rt = rt->u.next) {
		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
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1580
	write_unlock_bh(&table->tb6_lock);
1581 1582 1583 1584 1585 1586 1587
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_INFO,
		.fc_metric	= 1024,
		.fc_ifindex	= ifindex,
		.fc_dst_len	= prefixlen,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
				  RTF_UP | RTF_PREF(pref),
	};

	ipv6_addr_copy(&cfg.fc_dst, prefix);
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1599

1600 1601
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1602
		cfg.fc_flags |= RTF_DEFAULT;
1603

1604
	ip6_route_add(&cfg);
1605 1606 1607 1608 1609

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

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1610 1611 1612
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
{	
	struct rt6_info *rt;
T
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1613
	struct fib6_table *table;
L
Linus Torvalds 已提交
1614

T
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1615 1616 1617
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return NULL;
L
Linus Torvalds 已提交
1618

T
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1619 1620
	write_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) {
L
Linus Torvalds 已提交
1621
		if (dev == rt->rt6i_dev &&
1622
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
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1623 1624 1625 1626 1627
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1628
	write_unlock_bh(&table->tb6_lock);
L
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1629 1630 1631 1632
	return rt;
}

struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1633 1634
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1635
{
1636 1637 1638 1639 1640 1641 1642
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_DFLT,
		.fc_metric	= 1024,
		.fc_ifindex	= dev->ifindex,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
	};
L
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1643

1644
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
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1645

1646
	ip6_route_add(&cfg);
L
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1647 1648 1649 1650 1651 1652 1653

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1654 1655 1656 1657 1658 1659
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return;
L
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1660 1661

restart:
T
Thomas Graf 已提交
1662 1663
	read_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) {
L
Linus Torvalds 已提交
1664 1665
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1666
			read_unlock_bh(&table->tb6_lock);
1667
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1668 1669 1670
			goto restart;
		}
	}
T
Thomas Graf 已提交
1671
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1672 1673
}

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
				 struct fib6_config *cfg)
{
	memset(cfg, 0, sizeof(*cfg));

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

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

L
Linus Torvalds 已提交
1692 1693
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
{
1694
	struct fib6_config cfg;
L
Linus Torvalds 已提交
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
	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;
1707 1708 1709

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
Linus Torvalds 已提交
1710 1711 1712
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1713
			err = ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1714 1715
			break;
		case SIOCDELRT:
1716
			err = ip6_route_del(&cfg);
L
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1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
	};

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

1733
static int ip6_pkt_discard(struct sk_buff *skb)
L
Linus Torvalds 已提交
1734
{
1735 1736 1737 1738
	int type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
	if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED)
		IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS);

L
Linus Torvalds 已提交
1739 1740 1741 1742 1743 1744
	IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
	kfree_skb(skb);
	return 0;
}

1745
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
{
	skb->dev = skb->dst->dev;
	return ip6_pkt_discard(skb);
}

/*
 *	Allocate a dst for local (unicast / anycast) address.
 */

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

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

	dev_hold(&loopback_dev);
	in6_dev_hold(idev);

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

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1778 1779 1780
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1781 1782 1783 1784 1785 1786 1787 1788 1789
		rt->rt6i_flags |= RTF_LOCAL;
	rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
	if (rt->rt6i_nexthop == NULL) {
		dst_free((struct dst_entry *) rt);
		return ERR_PTR(-ENOMEM);
	}

	ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
	rt->rt6i_dst.plen = 128;
T
Thomas Graf 已提交
1790
	rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808

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

	return rt;
}

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

void rt6_ifdown(struct net_device *dev)
{
T
Thomas Graf 已提交
1809
	fib6_clean_all(fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
}

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) &&
            (dst_mtu(&rt->u.dst) > arg->mtu ||
             (dst_mtu(&rt->u.dst) < arg->mtu &&
	      dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
		rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
	return 0;
}

void rt6_mtu_change(struct net_device *dev, unsigned mtu)
{
T
Thomas Graf 已提交
1859 1860 1861 1862
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1863

T
Thomas Graf 已提交
1864
	fib6_clean_all(rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1865 1866
}

1867 1868 1869
static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
	[RTA_GATEWAY]           = { .minlen = sizeof(struct in6_addr) },
	[RTA_OIF]               = { .type = NLA_U32 },
1870
	[RTA_IIF]		= { .type = NLA_U32 },
1871 1872 1873 1874 1875 1876
	[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
1877
{
1878 1879 1880
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1881

1882 1883 1884
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1885

1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
	err = -EINVAL;
	rtm = nlmsg_data(nlh);
	memset(cfg, 0, sizeof(*cfg));

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

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

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

	if (tb[RTA_GATEWAY]) {
		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
		cfg->fc_flags |= RTF_GATEWAY;
L
Linus Torvalds 已提交
1905
	}
1906 1907 1908 1909 1910 1911 1912 1913

	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
1914
	}
1915 1916 1917 1918 1919 1920 1921 1922

	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
1923
	}
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933

	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
1934
	}
1935 1936 1937 1938 1939 1940 1941

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
1942 1943 1944 1945
}

int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1946 1947
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
1948

1949 1950 1951 1952 1953
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1954 1955 1956 1957
}

int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1958 1959
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
1960

1961 1962 1963 1964 1965
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1966 1967 1968
}

static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
1969 1970 1971
			 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
1972 1973
{
	struct rtmsg *rtm;
1974
	struct nlmsghdr *nlh;
L
Linus Torvalds 已提交
1975
	struct rta_cacheinfo ci;
1976
	u32 table;
L
Linus Torvalds 已提交
1977 1978 1979 1980 1981 1982 1983 1984

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

1985 1986 1987 1988 1989
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
	if (nlh == NULL)
		return -ENOBUFS;

	rtm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
1990 1991 1992 1993
	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
1994
	if (rt->rt6i_table)
1995
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
1996
	else
1997 1998
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
1999
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
	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) {
2020
		NLA_PUT(skb, RTA_DST, 16, dst);
L
Linus Torvalds 已提交
2021 2022
	        rtm->rtm_dst_len = 128;
	} else if (rtm->rtm_dst_len)
2023
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2024 2025
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2026
		NLA_PUT(skb, RTA_SRC, 16, src);
L
Linus Torvalds 已提交
2027 2028
	        rtm->rtm_src_len = 128;
	} else if (rtm->rtm_src_len)
2029
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2030 2031
#endif
	if (iif)
2032
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
Linus Torvalds 已提交
2033 2034 2035
	else if (dst) {
		struct in6_addr saddr_buf;
		if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2036
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2037
	}
2038

L
Linus Torvalds 已提交
2039
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2040 2041
		goto nla_put_failure;

L
Linus Torvalds 已提交
2042
	if (rt->u.dst.neighbour)
2043 2044
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2045
	if (rt->u.dst.dev)
2046 2047 2048
		NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);

	NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
L
Linus Torvalds 已提交
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059
	ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
	if (rt->rt6i_expires)
		ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
	else
		ci.rta_expires = 0;
	ci.rta_used = rt->u.dst.__use;
	ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
	ci.rta_error = rt->u.dst.error;
	ci.rta_id = 0;
	ci.rta_ts = 0;
	ci.rta_tsage = 0;
2060 2061 2062 2063 2064 2065
	NLA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);

	return nlmsg_end(skb, nlh);

nla_put_failure:
	return nlmsg_cancel(skb, nlh);
L
Linus Torvalds 已提交
2066 2067
}

2068
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2069 2070 2071 2072
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2073 2074
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2075 2076 2077 2078 2079 2080
		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,
2081
		     prefix, NLM_F_MULTI);
L
Linus Torvalds 已提交
2082 2083 2084 2085
}

int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
{
2086 2087
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
Linus Torvalds 已提交
2088
	struct sk_buff *skb;
2089
	struct rtmsg *rtm;
L
Linus Torvalds 已提交
2090
	struct flowi fl;
2091
	int err, iif = 0;
L
Linus Torvalds 已提交
2092

2093 2094 2095
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2096

2097
	err = -EINVAL;
L
Linus Torvalds 已提交
2098 2099
	memset(&fl, 0, sizeof(fl));

2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
	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
2119 2120 2121 2122 2123 2124

	if (iif) {
		struct net_device *dev;
		dev = __dev_get_by_index(iif);
		if (!dev) {
			err = -ENODEV;
2125
			goto errout;
L
Linus Torvalds 已提交
2126 2127 2128
		}
	}

2129 2130 2131 2132 2133
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
L
Linus Torvalds 已提交
2134

2135 2136 2137 2138 2139
	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
	skb->mac.raw = skb->data;
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
L
Linus Torvalds 已提交
2140

2141
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
L
Linus Torvalds 已提交
2142 2143
	skb->dst = &rt->u.dst;

2144
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
Linus Torvalds 已提交
2145
			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2146
			    nlh->nlmsg_seq, 0, 0);
L
Linus Torvalds 已提交
2147
	if (err < 0) {
2148 2149
		kfree_skb(skb);
		goto errout;
L
Linus Torvalds 已提交
2150 2151
	}

2152
	err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2153
errout:
L
Linus Torvalds 已提交
2154 2155 2156
	return err;
}

2157
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
L
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{
	struct sk_buff *skb;
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	u32 pid = 0, seq = 0;
	struct nlmsghdr *nlh = NULL;
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	int payload = sizeof(struct rtmsg) + 256;
	int err = -ENOBUFS;

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	if (info) {
		pid = info->pid;
		nlh = info->nlh;
		if (nlh)
			seq = nlh->nlmsg_seq;
	}

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	skb = nlmsg_new(nlmsg_total_size(payload), gfp_any());
	if (skb == NULL)
		goto errout;

	err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
	if (err < 0) {
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		kfree_skb(skb);
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		goto errout;
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	}
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	err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
errout:
	if (err < 0)
		rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
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}

/*
 *	/proc
 */

#ifdef CONFIG_PROC_FS

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

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

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

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

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

	for (i=0; i<16; i++) {
		sprintf(arg->buffer + arg->len, "%02x",
			rt->rt6i_dst.addr.s6_addr[i]);
		arg->len += 2;
	}
	arg->len += sprintf(arg->buffer + arg->len, " %02x ",
			    rt->rt6i_dst.plen);

#ifdef CONFIG_IPV6_SUBTREES
	for (i=0; i<16; i++) {
		sprintf(arg->buffer + arg->len, "%02x",
			rt->rt6i_src.addr.s6_addr[i]);
		arg->len += 2;
	}
	arg->len += sprintf(arg->buffer + arg->len, " %02x ",
			    rt->rt6i_src.plen);
#else
	sprintf(arg->buffer + arg->len,
		"00000000000000000000000000000000 00 ");
	arg->len += 36;
#endif

	if (rt->rt6i_nexthop) {
		for (i=0; i<16; i++) {
			sprintf(arg->buffer + arg->len, "%02x",
				rt->rt6i_nexthop->primary_key[i]);
			arg->len += 2;
		}
	} else {
		sprintf(arg->buffer + arg->len,
			"00000000000000000000000000000000");
		arg->len += 32;
	}
	arg->len += sprintf(arg->buffer + arg->len,
			    " %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 : "");
	return 0;
}

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

	arg.len -= offset % RT6_INFO_LEN;

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

	return arg.len;
}

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

	return 0;
}

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

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

#ifdef CONFIG_SYSCTL

static int flush_delay;

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

ctl_table ipv6_route_table[] = {
        {
		.ctl_name	=	NET_IPV6_ROUTE_FLUSH, 
		.procname	=	"flush",
         	.data		=	&flush_delay,
		.maxlen		=	sizeof(int),
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		.mode		=	0200,
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         	.proc_handler	=	&ipv6_sysctl_rtcache_flush
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_THRESH,
		.procname	=	"gc_thresh",
         	.data		=	&ip6_dst_ops.gc_thresh,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MAX_SIZE,
		.procname	=	"max_size",
         	.data		=	&ip6_rt_max_size,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL,
		.procname	=	"gc_min_interval",
         	.data		=	&ip6_rt_gc_min_interval,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_TIMEOUT,
		.procname	=	"gc_timeout",
         	.data		=	&ip6_rt_gc_timeout,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_INTERVAL,
		.procname	=	"gc_interval",
         	.data		=	&ip6_rt_gc_interval,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_ELASTICITY,
		.procname	=	"gc_elasticity",
         	.data		=	&ip6_rt_gc_elasticity,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MTU_EXPIRES,
		.procname	=	"mtu_expires",
         	.data		=	&ip6_rt_mtu_expires,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_MIN_ADVMSS,
		.procname	=	"min_adv_mss",
         	.data		=	&ip6_rt_min_advmss,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_jiffies,
		.strategy	=	&sysctl_jiffies,
	},
	{
		.ctl_name	=	NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
		.procname	=	"gc_min_interval_ms",
         	.data		=	&ip6_rt_gc_min_interval,
		.maxlen		=	sizeof(int),
		.mode		=	0644,
         	.proc_handler	=	&proc_dointvec_ms_jiffies,
		.strategy	=	&sysctl_ms_jiffies,
	},
	{ .ctl_name = 0 }
};

#endif

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

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	ip6_dst_ops.kmem_cachep =
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
				  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
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	fib6_init();
#ifdef 	CONFIG_PROC_FS
	p = proc_net_create("ipv6_route", 0, rt6_proc_info);
	if (p)
		p->owner = THIS_MODULE;

	proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
#endif
#ifdef CONFIG_XFRM
	xfrm6_init();
#endif
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_init();
#endif
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}

void ip6_route_cleanup(void)
{
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	fib6_rules_cleanup();
#endif
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#ifdef CONFIG_PROC_FS
	proc_net_remove("ipv6_route");
	proc_net_remove("rt6_stats");
#endif
#ifdef CONFIG_XFRM
	xfrm6_fini();
#endif
	rt6_ifdown(NULL);
	fib6_gc_cleanup();
	kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
}