route.c 55.9 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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#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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#define RT6_SELECT_F_IFACE	0x1
#define RT6_SELECT_F_REACHABLE	0x2

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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_SELECT_F_IFACE))
		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_SELECT_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 &&
	    (strict & RT6_SELECT_F_REACHABLE) &&
	    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;
	rt = rt6_device_match(rt, fl->oif, flags & RT6_F_STRICT);
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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;
	int flags = strict ? RT6_F_STRICT : 0;

	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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		ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
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Linus Torvalds 已提交
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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);

606
	}
L
Linus Torvalds 已提交
607

608 609
	return rt;
}
L
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610

611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
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
626 627
static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
					    struct flowi *fl, int flags)
L
Linus Torvalds 已提交
628 629
{
	struct fib6_node *fn;
630
	struct rt6_info *rt, *nrt;
T
Thomas Graf 已提交
631
	int strict = 0;
L
Linus Torvalds 已提交
632
	int attempts = 3;
633
	int err;
634
	int reachable = RT6_SELECT_F_REACHABLE;
L
Linus Torvalds 已提交
635

T
Thomas Graf 已提交
636 637
	if (flags & RT6_F_STRICT)
		strict = RT6_SELECT_F_IFACE;
L
Linus Torvalds 已提交
638 639

relookup:
T
Thomas Graf 已提交
640
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
641

642
restart_2:
T
Thomas Graf 已提交
643
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
644 645

restart:
T
Thomas Graf 已提交
646
	rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);
647
	BACKTRACK(&fl->fl6_src);
648 649
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
650
		goto out;
L
Linus Torvalds 已提交
651

652
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
653
	read_unlock_bh(&table->tb6_lock);
654

655
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
T
Thomas Graf 已提交
656
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
657 658
	else {
#if CLONE_OFFLINK_ROUTE
T
Thomas Graf 已提交
659
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
660 661 662 663
#else
		goto out2;
#endif
	}
664

665 666
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
Linus Torvalds 已提交
667

668 669
	dst_hold(&rt->u.dst);
	if (nrt) {
670
		err = ip6_ins_rt(nrt);
671
		if (!err)
L
Linus Torvalds 已提交
672 673 674
			goto out2;
	}

675 676 677 678
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
679
	 * Race condition! In the gap, when table->tb6_lock was
680 681 682 683 684 685
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
686 687 688 689
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
690
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
691
	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
695 696

	return rt;
L
Linus Torvalds 已提交
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}

T
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699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
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,
				.flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK,
			},
		},
		.proto = iph->nexthdr,
	};
	int flags = 0;

	if (rt6_need_strict(&iph->daddr))
		flags |= RT6_F_STRICT;

	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;
725
	struct rt6_info *rt, *nrt;
T
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726
	int strict = 0;
L
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727
	int attempts = 3;
728
	int err;
729
	int reachable = RT6_SELECT_F_REACHABLE;
L
Linus Torvalds 已提交
730

T
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	if (flags & RT6_F_STRICT)
		strict = RT6_SELECT_F_IFACE;
L
Linus Torvalds 已提交
733 734

relookup:
T
Thomas Graf 已提交
735
	read_lock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
736

737
restart_2:
T
Thomas Graf 已提交
738
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
L
Linus Torvalds 已提交
739 740

restart:
741
	rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
742
	BACKTRACK(&fl->fl6_src);
743 744
	if (rt == &ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
L
Linus Torvalds 已提交
745 746
		goto out;

747
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
748
	read_unlock_bh(&table->tb6_lock);
749

750
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
751
		nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
752 753 754 755 756 757 758
	else {
#if CLONE_OFFLINK_ROUTE
		nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
#else
		goto out2;
#endif
	}
L
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759

760 761
	dst_release(&rt->u.dst);
	rt = nrt ? : &ip6_null_entry;
L
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762

763 764
	dst_hold(&rt->u.dst);
	if (nrt) {
765
		err = ip6_ins_rt(nrt);
766
		if (!err)
L
Linus Torvalds 已提交
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			goto out2;
	}
769

770 771 772 773
	if (--attempts <= 0)
		goto out2;

	/*
T
Thomas Graf 已提交
774
	 * Race condition! In the gap, when table->tb6_lock was
775 776 777 778 779 780
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->u.dst);
	goto relookup;

out:
781 782 783 784
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
785
	dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
786
	read_unlock_bh(&table->tb6_lock);
L
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787 788 789
out2:
	rt->u.dst.lastuse = jiffies;
	rt->u.dst.__use++;
T
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790 791 792 793 794 795 796 797 798 799 800
	return rt;
}

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

	if (rt6_need_strict(&fl->fl6_dst))
		flags |= RT6_F_STRICT;

	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)
826
			ip6_del_rt(rt);
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Linus Torvalds 已提交
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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;
860
		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
L
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	}
}

static int ipv6_get_mtu(struct net_device *dev);

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

	if (mtu < ip6_rt_min_advmss)
		mtu = ip6_rt_min_advmss;

	/*
	 * 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;
}

884
static struct dst_entry *ndisc_dst_gc_list;
A
Adrian Bunk 已提交
885
static DEFINE_SPINLOCK(ndisc_lock);
886

L
Linus Torvalds 已提交
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926
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

927
	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
928 929
	rt->u.dst.next = ndisc_dst_gc_list;
	ndisc_dst_gc_list = &rt->u.dst;
930
	spin_unlock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
931 932 933 934 935 936 937 938 939 940 941 942 943

	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;
944 945 946
 	freed = 0;

	spin_lock_bh(&ndisc_lock);
L
Linus Torvalds 已提交
947
	pprev = &ndisc_dst_gc_list;
948

L
Linus Torvalds 已提交
949 950 951 952 953 954 955 956 957 958 959
	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
			freed++;
		} else {
			pprev = &dst->next;
			(*more)++;
		}
	}

960 961
	spin_unlock_bh(&ndisc_lock);

L
Linus Torvalds 已提交
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 1019 1020 1021
	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;
}

/*
 *
 */

1022
int ip6_route_add(struct fib6_config *cfg)
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027
{
	int err;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
T
Thomas Graf 已提交
1028
	struct fib6_table *table;
L
Linus Torvalds 已提交
1029 1030
	int addr_type;

1031
	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
L
Linus Torvalds 已提交
1032 1033
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
1034
	if (cfg->fc_src_len)
L
Linus Torvalds 已提交
1035 1036
		return -EINVAL;
#endif
1037
	if (cfg->fc_ifindex) {
L
Linus Torvalds 已提交
1038
		err = -ENODEV;
1039
		dev = dev_get_by_index(cfg->fc_ifindex);
L
Linus Torvalds 已提交
1040 1041 1042 1043 1044 1045 1046
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

1047 1048
	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;
L
Linus Torvalds 已提交
1049

1050
	table = fib6_new_table(cfg->fc_table);
T
Thomas Graf 已提交
1051 1052 1053 1054 1055
	if (table == NULL) {
		err = -ENOBUFS;
		goto out;
	}

L
Linus Torvalds 已提交
1056 1057 1058 1059 1060 1061 1062 1063
	rt = ip6_dst_alloc();

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

	rt->u.dst.obsolete = -1;
1064
	rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
L
Linus Torvalds 已提交
1065

1066 1067 1068 1069 1070
	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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1071 1072 1073 1074 1075 1076 1077 1078

	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;

1079 1080
	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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1081 1082 1083 1084
	if (rt->rt6i_dst.plen == 128)
	       rt->u.dst.flags = DST_HOST;

#ifdef CONFIG_IPV6_SUBTREES
1085 1086
	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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1087 1088
#endif

1089
	rt->rt6i_metric = cfg->fc_metric;
L
Linus Torvalds 已提交
1090 1091 1092 1093

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
1094
	if ((cfg->fc_flags & RTF_REJECT) ||
L
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1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
	    (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;
	}

1117
	if (cfg->fc_flags & RTF_GATEWAY) {
L
Linus Torvalds 已提交
1118 1119 1120
		struct in6_addr *gw_addr;
		int gwa_type;

1121 1122
		gw_addr = &cfg->fc_gateway;
		ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
		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;

1139
			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;

1171
	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;
		}
	}

1180
	rt->rt6i_flags = cfg->fc_flags;
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install_route:
1183 1184 1185 1186 1187 1188 1189 1190 1191
	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;
				}
1195 1196

				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;
1210
	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;
}

1222
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
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{
	int err;
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1225
	struct fib6_table *table;
L
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1226

1227 1228 1229
	if (rt == &ip6_null_entry)
		return -ENOENT;

T
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	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
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1232

1233
	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;
}

1241 1242
int ip6_del_rt(struct rt6_info *rt)
{
1243
	return __ip6_del_rt(rt, NULL);
1244 1245
}

1246
static int ip6_route_del(struct fib6_config *cfg)
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{
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	struct fib6_table *table;
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	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

1253
	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,
1260 1261
			 &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) {
1265
			if (cfg->fc_ifindex &&
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			    (rt->rt6i_dev == NULL ||
1267
			     rt->rt6i_dev->ifindex != cfg->fc_ifindex))
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				continue;
1269 1270
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
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				continue;
1272
			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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1277
			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
 */
1288 1289 1290 1291 1292 1293 1294 1295
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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{
1297 1298
	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
	struct rt6_info *rt;
1299
	struct fib6_node *fn;
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	/*
1302 1303 1304 1305 1306 1307 1308 1309
	 * 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);
1313
	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
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;
1328
		if (fl->oif != rt->rt6i_dev->ifindex)
1329
			continue;
1330
		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1331 1332 1333
			continue;
		break;
	}
1334

1335
	if (!rt)
1336
		rt = &ip6_null_entry;
1337 1338
	BACKTRACK(&fl->fl6_src);
out:
1339 1340
	dst_hold(&rt->u.dst);

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	read_unlock_bh(&table->tb6_lock);
1342

1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
	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,
	};
	int flags = rt6_need_strict(dest) ? RT6_F_STRICT : 0;

	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");
1381
		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));

1424
	if (ip6_ins_rt(nrt))
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		goto out;

1427 1428 1429 1430
	netevent.old = &rt->u.dst;
	netevent.new = &nrt->u.dst;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

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	if (rt->rt6i_flags&RTF_CACHE) {
1432
		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.
	 */
1495
	if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1496
		nrt = rt6_alloc_cow(rt, daddr, saddr);
1497 1498
	else
		nrt = rt6_alloc_clone(rt, daddr);
1499

1500
	if (nrt) {
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
		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;

1514
		ip6_ins_rt(nrt);
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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 1547 1548 1549
	}
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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		rt->rt6i_table = ort->rt6i_table;
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1551 1552 1553 1554
	}
	return rt;
}

1555 1556 1557 1558 1559 1560
#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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1561 1562 1563 1564 1565
	struct fib6_table *table;

	table = fib6_get_table(RT6_TABLE_INFO);
	if (table == NULL)
		return NULL;
1566

T
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1567 1568
	write_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	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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1583
	write_unlock_bh(&table->tb6_lock);
1584 1585 1586 1587 1588 1589 1590
	return rt;
}

static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
					   struct in6_addr *gwaddr, int ifindex,
					   unsigned pref)
{
1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
	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);
1602

1603 1604
	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
1605
		cfg.fc_flags |= RTF_DEFAULT;
1606

1607
	ip6_route_add(&cfg);
1608 1609 1610 1611 1612

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

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struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
{	
	struct rt6_info *rt;
T
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1616
	struct fib6_table *table;
L
Linus Torvalds 已提交
1617

T
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1618 1619 1620
	table = fib6_get_table(RT6_TABLE_DFLT);
	if (table == NULL)
		return NULL;
L
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1621

T
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1622 1623
	write_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) {
L
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1624
		if (dev == rt->rt6i_dev &&
1625
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
L
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1626 1627 1628 1629 1630
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->u.dst);
T
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1631
	write_unlock_bh(&table->tb6_lock);
L
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1632 1633 1634 1635
	return rt;
}

struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1636 1637
				     struct net_device *dev,
				     unsigned int pref)
L
Linus Torvalds 已提交
1638
{
1639 1640 1641 1642 1643 1644 1645
	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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1646

1647
	ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
L
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1648

1649
	ip6_route_add(&cfg);
L
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1650 1651 1652 1653 1654 1655 1656

	return rt6_get_dflt_router(gwaddr, dev);
}

void rt6_purge_dflt_routers(void)
{
	struct rt6_info *rt;
T
Thomas Graf 已提交
1657 1658 1659 1660 1661 1662
	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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1663 1664

restart:
T
Thomas Graf 已提交
1665 1666
	read_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) {
L
Linus Torvalds 已提交
1667 1668
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->u.dst);
T
Thomas Graf 已提交
1669
			read_unlock_bh(&table->tb6_lock);
1670
			ip6_del_rt(rt);
L
Linus Torvalds 已提交
1671 1672 1673
			goto restart;
		}
	}
T
Thomas Graf 已提交
1674
	read_unlock_bh(&table->tb6_lock);
L
Linus Torvalds 已提交
1675 1676
}

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
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
1695 1696
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
{
1697
	struct fib6_config cfg;
L
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1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
	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;
1710 1711 1712

		rtmsg_to_fib6_config(&rtmsg, &cfg);

L
Linus Torvalds 已提交
1713 1714 1715
		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
1716
			err = ip6_route_add(&cfg);
L
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1717 1718
			break;
		case SIOCDELRT:
1719
			err = ip6_route_del(&cfg);
L
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1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
	};

	return -EINVAL;
}

/*
 *	Drop the packet on the floor
 */

1736
static int ip6_pkt_discard(struct sk_buff *skb)
L
Linus Torvalds 已提交
1737
{
1738 1739 1740 1741
	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
1742 1743 1744 1745 1746 1747
	IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
	kfree_skb(skb);
	return 0;
}

1748
static int ip6_pkt_discard_out(struct sk_buff *skb)
L
Linus Torvalds 已提交
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 1778 1779 1780
{
	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;
1781 1782 1783
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
L
Linus Torvalds 已提交
1784 1785 1786 1787 1788 1789 1790 1791 1792
		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
1793
	rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811

	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
1812
	fib6_clean_all(fib6_ifdown, 0, dev);
L
Linus Torvalds 已提交
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 1859 1860 1861
}

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
1862 1863 1864 1865
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};
L
Linus Torvalds 已提交
1866

T
Thomas Graf 已提交
1867
	fib6_clean_all(rt6_mtu_change_route, 0, &arg);
L
Linus Torvalds 已提交
1868 1869
}

1870 1871 1872
static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
	[RTA_GATEWAY]           = { .minlen = sizeof(struct in6_addr) },
	[RTA_OIF]               = { .type = NLA_U32 },
1873
	[RTA_IIF]		= { .type = NLA_U32 },
1874 1875 1876 1877 1878 1879
	[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
1880
{
1881 1882 1883
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;
L
Linus Torvalds 已提交
1884

1885 1886 1887
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
1888

1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
	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
1908
	}
1909 1910 1911 1912 1913 1914 1915 1916

	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
1917
	}
1918 1919 1920 1921 1922 1923 1924 1925

	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
1926
	}
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936

	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
1937
	}
1938 1939 1940 1941 1942 1943 1944

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

	err = 0;
errout:
	return err;
L
Linus Torvalds 已提交
1945 1946 1947 1948
}

int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1949 1950
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
1951

1952 1953 1954 1955 1956
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_del(&cfg);
L
Linus Torvalds 已提交
1957 1958 1959 1960
}

int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
1961 1962
	struct fib6_config cfg;
	int err;
L
Linus Torvalds 已提交
1963

1964 1965 1966 1967 1968
	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	return ip6_route_add(&cfg);
L
Linus Torvalds 已提交
1969 1970 1971
}

static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
1972 1973 1974
			 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
1975 1976
{
	struct rtmsg *rtm;
1977
	struct nlmsghdr *nlh;
L
Linus Torvalds 已提交
1978
	struct rta_cacheinfo ci;
1979
	u32 table;
L
Linus Torvalds 已提交
1980 1981 1982 1983 1984 1985 1986 1987

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

1988 1989 1990 1991 1992
	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
1993 1994 1995 1996
	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
1997
	if (rt->rt6i_table)
1998
		table = rt->rt6i_table->tb6_id;
T
Thomas Graf 已提交
1999
	else
2000 2001
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
2002
	NLA_PUT_U32(skb, RTA_TABLE, table);
L
Linus Torvalds 已提交
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
	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) {
2023
		NLA_PUT(skb, RTA_DST, 16, dst);
L
Linus Torvalds 已提交
2024 2025
	        rtm->rtm_dst_len = 128;
	} else if (rtm->rtm_dst_len)
2026
		NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
L
Linus Torvalds 已提交
2027 2028
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
2029
		NLA_PUT(skb, RTA_SRC, 16, src);
L
Linus Torvalds 已提交
2030 2031
	        rtm->rtm_src_len = 128;
	} else if (rtm->rtm_src_len)
2032
		NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
L
Linus Torvalds 已提交
2033 2034
#endif
	if (iif)
2035
		NLA_PUT_U32(skb, RTA_IIF, iif);
L
Linus Torvalds 已提交
2036 2037 2038
	else if (dst) {
		struct in6_addr saddr_buf;
		if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2039
			NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
L
Linus Torvalds 已提交
2040
	}
2041

L
Linus Torvalds 已提交
2042
	if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2043 2044
		goto nla_put_failure;

L
Linus Torvalds 已提交
2045
	if (rt->u.dst.neighbour)
2046 2047
		NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);

L
Linus Torvalds 已提交
2048
	if (rt->u.dst.dev)
2049 2050 2051
		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
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062
	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;
2063 2064 2065 2066 2067 2068
	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
2069 2070
}

2071
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
L
Linus Torvalds 已提交
2072 2073 2074 2075
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

2076 2077
	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
L
Linus Torvalds 已提交
2078 2079 2080 2081 2082 2083
		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,
2084
		     prefix, NLM_F_MULTI);
L
Linus Torvalds 已提交
2085 2086 2087 2088
}

int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
{
2089 2090
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
L
Linus Torvalds 已提交
2091
	struct sk_buff *skb;
2092
	struct rtmsg *rtm;
L
Linus Torvalds 已提交
2093
	struct flowi fl;
2094
	int err, iif = 0;
L
Linus Torvalds 已提交
2095

2096 2097 2098
	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;
L
Linus Torvalds 已提交
2099

2100
	err = -EINVAL;
L
Linus Torvalds 已提交
2101 2102
	memset(&fl, 0, sizeof(fl));

2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
	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
2122 2123 2124 2125 2126 2127

	if (iif) {
		struct net_device *dev;
		dev = __dev_get_by_index(iif);
		if (!dev) {
			err = -ENODEV;
2128
			goto errout;
L
Linus Torvalds 已提交
2129 2130 2131
		}
	}

2132 2133 2134 2135 2136
	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}
L
Linus Torvalds 已提交
2137

2138 2139 2140 2141 2142
	/* 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
2143

2144
	rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
L
Linus Torvalds 已提交
2145 2146
	skb->dst = &rt->u.dst;

2147
	err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
L
Linus Torvalds 已提交
2148
			    RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2149
			    nlh->nlmsg_seq, 0, 0);
L
Linus Torvalds 已提交
2150
	if (err < 0) {
2151 2152
		kfree_skb(skb);
		goto errout;
L
Linus Torvalds 已提交
2153 2154
	}

2155
	err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2156
errout:
L
Linus Torvalds 已提交
2157 2158 2159
	return err;
}

2160
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;
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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;

	ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
						     sizeof(struct rt6_info),
						     0, SLAB_HWCACHE_ALIGN,
						     NULL, NULL);
	if (!ip6_dst_ops.kmem_cachep)
		panic("cannot create ip6_dst_cache");

	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);
}