route.c 56.5 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

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

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

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

#endif

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

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

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

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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		else if (!(neigh->nud_state & NUD_FAILED))
			m = 1;
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		read_unlock_bh(&neigh->lock);
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	}
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	return m;
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}

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static int rt6_score_route(struct rt6_info *rt, int oif,
			   int strict)
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{
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	int m, n;
		
	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;
}

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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			if (strict & RT6_LOOKUP_F_REACHABLE)
				rt6_probe(match);
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			match = rt;
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			mpri = m;
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		} else if (strict & RT6_LOOKUP_F_REACHABLE) {
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			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; \
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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) \
				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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out:
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	dst_hold(&rt->u.dst);
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	read_unlock_bh(&table->tb6_lock);
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	rt->u.dst.lastuse = jiffies;
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	rt->u.dst.__use++;

	return rt;

}

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

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

	dst_release(dst);

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	return NULL;
}

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/* 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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583 584 585 586 587 588 589 590 591 592
{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort);

	if (rt) {
593 594 595 596
		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
597
			ipv6_addr_copy(&rt->rt6i_gateway, daddr);
598
		}
L
Linus Torvalds 已提交
599

600
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
L
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601 602 603 604 605 606 607 608 609 610 611 612 613
		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);

614
	}
L
Linus Torvalds 已提交
615

616 617
	return rt;
}
L
Linus Torvalds 已提交
618

619 620 621 622 623 624 625 626 627 628 629 630 631
static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
{
	struct rt6_info *rt = ip6_rt_copy(ort);
	if (rt) {
		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
		rt->rt6i_dst.plen = 128;
		rt->rt6i_flags |= RTF_CACHE;
		rt->u.dst.flags |= DST_HOST;
		rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
	}
	return rt;
}

A
Adrian Bunk 已提交
632 633
static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
L
Linus Torvalds 已提交
634 635
{
	struct fib6_node *fn;
636
	struct rt6_info *rt, *nrt;
T
Thomas Graf 已提交
637
	int strict = 0;
L
Linus Torvalds 已提交
638
	int attempts = 3;
639
	int err;
640
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
Linus Torvalds 已提交
641

642
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
Linus Torvalds 已提交
643 644

relookup:
T
Thomas Graf 已提交
645
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
646

647
restart_2:
T
Thomas Graf 已提交
648
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
649 650

restart:
T
Thomas Graf 已提交
651
	rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);
652
	BACKTRACK(&fl->fl6_src);
653 654
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
655
		goto out;
L
Linus Torvalds 已提交
656

657
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
658
	read_unlock_bh(&table->tb6_lock);
659

660
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
Thomas Graf 已提交
661
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
662 663
	else {
#if CLONE_OFFLINK_ROUTE
T
Thomas Graf 已提交
664
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
665 666 667 668
#else
		goto out2;
#endif
	}
669

670 671
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
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672

673 674
	dst_hold(&rt->u.dst);
	if (nrt) {
675
		err = ip6_ins_rt(nrt);
676
		if (!err)
L
Linus Torvalds 已提交
677 678 679
			goto out2;
	}

680 681 682 683
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
684
	 * Race condition! In the gap, when table->tb6_lock was
685 686 687 688 689 690
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
691 692 693 694
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
695
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
696
	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
700 701

	return rt;
L
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}

T
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void ip6_route_input(struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
707
	int flags = RT6_LOOKUP_F_HAS_SADDR;
T
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	struct flowi fl = {
		.iif = skb->dev->ifindex,
		.nl_u = {
			.ip6_u = {
				.daddr = iph->daddr,
				.saddr = iph->saddr,
A
Al Viro 已提交
714
				.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
T
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715 716
			},
		},
717
 		.mark = skb->mark,
T
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718 719
		.proto = iph->nexthdr,
	};
720 721 722

	if (rt6_need_strict(&iph->daddr))
		flags |= RT6_LOOKUP_F_IFACE;
T
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723 724 725 726 727 728

	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
Linus Torvalds 已提交
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{
	struct fib6_node *fn;
731
	struct rt6_info *rt, *nrt;
T
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732
	int strict = 0;
L
Linus Torvalds 已提交
733
	int attempts = 3;
734
	int err;
735
	int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
L
Linus Torvalds 已提交
736

737
	strict |= flags & RT6_LOOKUP_F_IFACE;
L
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738 739

relookup:
T
Thomas Graf 已提交
740
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
741

742
restart_2:
T
Thomas Graf 已提交
743
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
744 745

restart:
746
	rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
747
	BACKTRACK(&fl->fl6_src);
748 749
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
L
Linus Torvalds 已提交
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		goto out;

752
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
753
	read_unlock_bh(&table->tb6_lock);
754

755
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
756
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
757 758 759 760 761 762 763
	else {
#if CLONE_OFFLINK_ROUTE
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
#else
		goto out2;
#endif
	}
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764

765 766
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
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767

768 769
	dst_hold(&rt->u.dst);
	if (nrt) {
770
		err = ip6_ins_rt(nrt);
771
		if (!err)
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Linus Torvalds 已提交
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			goto out2;
	}
774

775 776 777 778
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
779
	 * Race condition! In the gap, when table->tb6_lock was
780 781 782 783 784 785
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
786 787 788 789
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
790
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
791
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
792 793 794
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
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795 796 797 798 799 800 801 802
	return rt;
}

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

	if (rt6_need_strict(&fl->fl6_dst))
803
		flags |= RT6_LOOKUP_F_IFACE;
T
Thomas Graf 已提交
804

805 806 807
	if (!ipv6_addr_any(&fl->fl6_src))
		flags |= RT6_LOOKUP_F_HAS_SADDR;

T
Thomas Graf 已提交
808
	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)
834
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
		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;
868
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
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Linus Torvalds 已提交
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
	}
}

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;
}

892
static struct dst_entry *ndisc_dst_gc_list;
A
Adrian Bunk 已提交
893
static DEFINE_SPINLOCK(ndisc_lock);
894

L
Linus Torvalds 已提交
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
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

935
	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
936 937
	rt->u.dst.next = ndisc_dst_gc_list;
	ndisc_dst_gc_list = &rt->u.dst;
938
	spin_unlock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
939 940 941 942 943 944 945 946 947 948 949 950 951

	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;
952 953 954
 	freed = 0;

	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
955
	pprev = &ndisc_dst_gc_list;
956

L
Linus Torvalds 已提交
957 958 959 960 961 962 963 964 965 966 967
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

968 969
	spin_unlock_bh(&ndisc_lock);

L
Linus Torvalds 已提交
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 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
	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;
}

/*
 *
 */

1030
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1031 1032 1033 1034 1035
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1036
	struct fib6_table *table;
L
Linus Torvalds 已提交
1037 1038
	int addr_type;

1039
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1040 1041
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1042
	if (cfg->fc_src_len)
L
Linus Torvalds 已提交
1043 1044
		return -EINVAL;
#endif
1045
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1046
		err = -ENODEV;
1047
		dev = dev_get_by_index(cfg->fc_ifindex);
L
Linus Torvalds 已提交
1048 1049 1050 1051 1052 1053 1054
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1055 1056
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1057

1058
	table = fib6_new_table(cfg->fc_table);
T
Thomas Graf 已提交
1059 1060 1061 1062 1063
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
Linus Torvalds 已提交
1064 1065 1066 1067 1068 1069 1070 1071
	rt = ip6_dst_alloc();

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

	rt->u.dst.obsolete = -1;
1072
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1073

1074 1075 1076 1077 1078
	if (cfg->fc_protocol == RTPROT_UNSPEC)
		cfg->fc_protocol = RTPROT_BOOT;
	rt->rt6i_protocol = cfg->fc_protocol;

	addr_type = ipv6_addr_type(&cfg->fc_dst);
L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084 1085 1086

	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;

1087 1088
	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
1089 1090 1091 1092
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1093 1094
	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
	rt->rt6i_src.plen = cfg->fc_src_len;
L
Linus Torvalds 已提交
1095 1096
#endif

1097
	rt->rt6i_metric = cfg->fc_metric;
L
Linus Torvalds 已提交
1098 1099 1100 1101

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1102
	if ((cfg->fc_flags & RTF_REJECT) ||
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
	    (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;
	}

1125
	if (cfg->fc_flags & RTF_GATEWAY) {
L
Linus Torvalds 已提交
1126 1127 1128
		struct in6_addr *gw_addr;
		int gwa_type;

1129 1130
		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;

1147
			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;

1179
	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;
		}
	}

1188
	rt->rt6i_flags = cfg->fc_flags;
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install_route:
1191 1192 1193 1194 1195 1196 1197 1198 1199
	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;
				}
1203 1204

				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;
1218
	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;
}

1230
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
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{
	int err;
T
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	struct fib6_table *table;
L
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1235 1236 1237
	if (rt == &ip6_null_entry)
		return -ENOENT;

T
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	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
L
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1240

1241
	err = fib6_del(rt, info);
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	dst_release(&rt->u.dst);

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

1249 1250
int ip6_del_rt(struct rt6_info *rt)
{
1251
	return __ip6_del_rt(rt, NULL);
1252 1253
}

1254
static int ip6_route_del(struct fib6_config *cfg)
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{
T
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	struct fib6_table *table;
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	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1261
	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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	fn = fib6_locate(&table->tb6_root,
1268 1269
			 &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) {
1273
			if (cfg->fc_ifindex &&
L
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			    (rt->rt6i_dev == NULL ||
1275
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
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				continue;
1277 1278
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
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				continue;
1280
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
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				continue;
			dst_hold(&rt->u.dst);
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			read_unlock_bh(&table->tb6_lock);
L
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1285
			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
 */
1296 1297 1298 1299 1300 1301 1302 1303
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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{
1305 1306
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1307
	struct fib6_node *fn;
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L
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	/*
1310 1311 1312 1313 1314 1315 1316 1317
	 * 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);
1321
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
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;
1336
		if (fl->oif != rt->rt6i_dev->ifindex)
1337
			continue;
1338
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1339 1340 1341
			continue;
		break;
	}
1342

1343
	if (!rt)
1344
		rt = &ip6_null_entry;
1345 1346
	BACKTRACK(&fl->fl6_src);
out:
1347 1348
	dst_hold(&rt->u.dst);

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	read_unlock_bh(&table->tb6_lock);
1350

1351 1352 1353 1354 1355 1356 1357 1358
	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)
{
1359
	int flags = RT6_LOOKUP_F_HAS_SADDR;
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
	struct ip6rd_flowi rdfl = {
		.fl = {
			.oif = dev->ifindex,
			.nl_u = {
				.ip6_u = {
					.daddr = *dest,
					.saddr = *src,
				},
			},
		},
		.gateway = *gateway,
	};
1372 1373 1374

	if (rt6_need_strict(dest))
		flags |= RT6_LOOKUP_F_IFACE;
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388

	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");
1392
		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));

1435
	if (ip6_ins_rt(nrt))
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		goto out;

1438 1439 1440 1441
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

L
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1442
	if (rt->rt6i_flags&RTF_CACHE) {
1443
		ip6_del_rt(rt);
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1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
		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.
	 */
1506
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1507
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1508 1509
	else
		nrt = rt6_alloc_clone(rt, daddr);
1510

1511
	if (nrt) {
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
		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;

1525
		ip6_ins_rt(nrt);
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1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
	}
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));
1544
		rt->u.dst.error = ort->u.dst.error;
L
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1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561
		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
1562
		rt->rt6i_table = ort->rt6i_table;
L
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1563 1564 1565 1566
	}
	return rt;
}

1567 1568 1569 1570 1571 1572
#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
1573 1574 1575 1576 1577
	struct fib6_table *table;

	table = fib6_get_table(RT6_TABLE_INFO);
	if (table == NULL)
		return NULL;
1578

T
Thomas Graf 已提交
1579 1580
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
	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
Thomas Graf 已提交
1595
	write_unlock_bh(&table->tb6_lock);
1596 1597 1598 1599 1600 1601 1602
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
	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);
1614

1615 1616
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1617
		cfg.fc_flags |= RTF_DEFAULT;
1618

1619
	ip6_route_add(&cfg);
1620 1621 1622 1623 1624

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

L
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1625 1626 1627
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
{	
	struct rt6_info *rt;
T
Thomas Graf 已提交
1628
	struct fib6_table *table;
L
Linus Torvalds 已提交
1629

T
Thomas Graf 已提交
1630 1631 1632
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return NULL;
L
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1633

T
Thomas Graf 已提交
1634 1635
	write_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) {
L
Linus Torvalds 已提交
1636
		if (dev == rt->rt6i_dev &&
1637
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
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1638 1639 1640 1641 1642
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1643
	write_unlock_bh(&table->tb6_lock);
L
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1644 1645 1646 1647
	return rt;
}

struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1648 1649
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1650
{
1651 1652 1653 1654 1655 1656 1657
	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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1658

1659
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
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1660

1661
	ip6_route_add(&cfg);
L
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1662 1663 1664 1665 1666 1667 1668

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1669 1670 1671 1672 1673 1674
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return;
L
Linus Torvalds 已提交
1675 1676

restart:
T
Thomas Graf 已提交
1677 1678
	read_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) {
L
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1679 1680
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1681
			read_unlock_bh(&table->tb6_lock);
1682
			ip6_del_rt(rt);
L
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1683 1684 1685
			goto restart;
		}
	}
T
Thomas Graf 已提交
1686
	read_unlock_bh(&table->tb6_lock);
L
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1687 1688
}

1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
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
1707 1708
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
{
1709
	struct fib6_config cfg;
L
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1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
	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;
1722 1723 1724

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
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1725 1726 1727
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1728
			err = ip6_route_add(&cfg);
L
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1729 1730
			break;
		case SIOCDELRT:
1731
			err = ip6_route_del(&cfg);
L
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1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
	};

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

1748
static inline int ip6_pkt_drop(struct sk_buff *skb, int code)
L
Linus Torvalds 已提交
1749
{
1750 1751 1752 1753
	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
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1754
	IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
1755
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
L
Linus Torvalds 已提交
1756 1757 1758 1759
	kfree_skb(skb);
	return 0;
}

1760 1761 1762 1763 1764
static int ip6_pkt_discard(struct sk_buff *skb)
{
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE);
}

1765
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
1766 1767 1768 1769 1770
{
	skb->dev = skb->dst->dev;
	return ip6_pkt_discard(skb);
}

1771 1772
#ifdef CONFIG_IPV6_MULTIPLE_TABLES

1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED);
}

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb->dst->dev;
	return ip6_pkt_prohibit(skb);
}

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

1790 1791
#endif

L
Linus Torvalds 已提交
1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818
/*
 *	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;
1819 1820 1821
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1822 1823 1824 1825 1826 1827 1828 1829 1830
		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
1831
	rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849

	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
1850
	fib6_clean_all(fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
}

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
1900 1901 1902 1903
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1904

T
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1905
	fib6_clean_all(rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1906 1907
}

1908
static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
1909
	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
1910
	[RTA_OIF]               = { .type = NLA_U32 },
1911
	[RTA_IIF]		= { .type = NLA_U32 },
1912 1913 1914 1915 1916 1917
	[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
1918
{
1919 1920 1921
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1922

1923 1924 1925
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1926

1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
	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
1946
	}
1947 1948 1949 1950 1951 1952 1953 1954

	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
1955
	}
1956 1957 1958 1959 1960 1961 1962 1963

	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
1964
	}
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974

	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
1975
	}
1976 1977 1978 1979 1980 1981 1982

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
1983 1984 1985 1986
}

int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1987 1988
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
1989

1990 1991 1992 1993 1994
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1995 1996 1997 1998
}

int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1999 2000
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
2001

2002 2003 2004 2005 2006
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
2007 2008 2009
}

static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2010 2011 2012
			 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
2013 2014
{
	struct rtmsg *rtm;
2015
	struct nlmsghdr *nlh;
L
Linus Torvalds 已提交
2016
	struct rta_cacheinfo ci;
2017
	u32 table;
L
Linus Torvalds 已提交
2018 2019 2020 2021 2022 2023 2024 2025

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

2026 2027 2028 2029 2030
	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
2031 2032 2033 2034
	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
2035
	if (rt->rt6i_table)
2036
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
2037
	else
2038 2039
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2040
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
	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) {
2061
		NLA_PUT(skb, RTA_DST, 16, dst);
L
Linus Torvalds 已提交
2062 2063
	        rtm->rtm_dst_len = 128;
	} else if (rtm->rtm_dst_len)
2064
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2065 2066
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2067
		NLA_PUT(skb, RTA_SRC, 16, src);
L
Linus Torvalds 已提交
2068 2069
	        rtm->rtm_src_len = 128;
	} else if (rtm->rtm_src_len)
2070
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2071 2072
#endif
	if (iif)
2073
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
Linus Torvalds 已提交
2074 2075 2076
	else if (dst) {
		struct in6_addr saddr_buf;
		if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2077
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2078
	}
2079

L
Linus Torvalds 已提交
2080
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2081 2082
		goto nla_put_failure;

L
Linus Torvalds 已提交
2083
	if (rt->u.dst.neighbour)
2084 2085
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2086
	if (rt->u.dst.dev)
2087 2088 2089
		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
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
	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;
2101 2102 2103 2104 2105 2106
	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
2107 2108
}

2109
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2110 2111 2112 2113
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2114 2115
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2116 2117 2118 2119 2120 2121
		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,
2122
		     prefix, NLM_F_MULTI);
L
Linus Torvalds 已提交
2123 2124 2125 2126
}

int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
{
2127 2128
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
Linus Torvalds 已提交
2129
	struct sk_buff *skb;
2130
	struct rtmsg *rtm;
L
Linus Torvalds 已提交
2131
	struct flowi fl;
2132
	int err, iif = 0;
L
Linus Torvalds 已提交
2133

2134 2135 2136
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2137

2138
	err = -EINVAL;
L
Linus Torvalds 已提交
2139 2140
	memset(&fl, 0, sizeof(fl));

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
	if (tb[RTA_SRC]) {
		if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
			goto errout;

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

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

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

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

	if (tb[RTA_OIF])
		fl.oif = nla_get_u32(tb[RTA_OIF]);
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	if (iif) {
		struct net_device *dev;
		dev = __dev_get_by_index(iif);
		if (!dev) {
			err = -ENODEV;
2166
			goto errout;
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		}
	}

2170 2171 2172 2173 2174
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
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	/* 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));
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2182
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
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	skb->dst = &rt->u.dst;

2185
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
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			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2187
			    nlh->nlmsg_seq, 0, 0);
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	if (err < 0) {
2189 2190
		kfree_skb(skb);
		goto errout;
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	}

2193
	err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2194
errout:
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	return err;
}

2198
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
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{
	struct sk_buff *skb;
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	u32 pid = 0, seq = 0;
	struct nlmsghdr *nlh = NULL;
2203 2204 2205
	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;
	}

2213 2214 2215 2216 2217 2218
	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);
2220
		goto errout;
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	}
2222 2223 2224 2225 2226

	err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
errout:
	if (err < 0)
		rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
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}

/*
 *	/proc
 */

#ifdef CONFIG_PROC_FS

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

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

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

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

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

2258 2259 2260
	arg->len += sprintf(arg->buffer + arg->len,
			    NIP6_SEQFMT " %02x ",
			    NIP6(rt->rt6i_dst.addr),
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			    rt->rt6i_dst.plen);

#ifdef CONFIG_IPV6_SUBTREES
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	arg->len += sprintf(arg->buffer + arg->len,
			    NIP6_SEQFMT " %02x ",
			    NIP6(rt->rt6i_src.addr),
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			    rt->rt6i_src.plen);
#else
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	arg->len += sprintf(arg->buffer + arg->len,
			    "00000000000000000000000000000000 00 ");
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#endif

	if (rt->rt6i_nexthop) {
2274 2275 2276
		arg->len += sprintf(arg->buffer + arg->len,
				    NIP6_SEQFMT,
				    NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
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	} else {
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		arg->len += sprintf(arg->buffer + arg->len,
				    "00000000000000000000000000000000");
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	}
	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),
2361
		.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);
}