ndisc.c 44.0 KB
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/*
 *	Neighbour Discovery for IPv6
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *	Mike Shaver		<shaver@ingenia.com>
 *
 *	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:
 *
 *	Lars Fenneberg			:	fixed MTU setting on receipt
 *						of an RA.
 *
 *	Janos Farkas			:	kmalloc failure checks
 *	Alexey Kuznetsov		:	state machine reworked
 *						and moved to net/core.
 *	Pekka Savola			:	RFC2461 validation
 *	YOSHIFUJI Hideaki @USAGI	:	Verify ND options properly
 */

/* Set to 3 to get tracing... */
#define ND_DEBUG 1

#define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
#define ND_NOPRINTK(x...) do { ; } while(0)
#define ND_PRINTK0 ND_PRINTK
#define ND_PRINTK1 ND_NOPRINTK
#define ND_PRINTK2 ND_NOPRINTK
#define ND_PRINTK3 ND_NOPRINTK
#if ND_DEBUG >= 1
#undef ND_PRINTK1
#define ND_PRINTK1 ND_PRINTK
#endif
#if ND_DEBUG >= 2
#undef ND_PRINTK2
#define ND_PRINTK2 ND_PRINTK
#endif
#if ND_DEBUG >= 3
#undef ND_PRINTK3
#define ND_PRINTK3 ND_PRINTK
#endif

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/sched.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/route.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

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#include <linux/if_addr.h>
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#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/jhash.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/icmp.h>

#include <net/flow.h>
#include <net/ip6_checksum.h>
#include <linux/proc_fs.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

static struct socket *ndisc_socket;

static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
static int ndisc_constructor(struct neighbour *neigh);
static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
static int pndisc_constructor(struct pneigh_entry *n);
static void pndisc_destructor(struct pneigh_entry *n);
static void pndisc_redo(struct sk_buff *skb);

static struct neigh_ops ndisc_generic_ops = {
	.family =		AF_INET6,
	.solicit =		ndisc_solicit,
	.error_report =		ndisc_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_connected_output,
	.hh_output =		dev_queue_xmit,
	.queue_xmit =		dev_queue_xmit,
};

static struct neigh_ops ndisc_hh_ops = {
	.family =		AF_INET6,
	.solicit =		ndisc_solicit,
	.error_report =		ndisc_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_resolve_output,
	.hh_output =		dev_queue_xmit,
	.queue_xmit =		dev_queue_xmit,
};


static struct neigh_ops ndisc_direct_ops = {
	.family =		AF_INET6,
	.output =		dev_queue_xmit,
	.connected_output =	dev_queue_xmit,
	.hh_output =		dev_queue_xmit,
	.queue_xmit =		dev_queue_xmit,
};

struct neigh_table nd_tbl = {
	.family =	AF_INET6,
	.entry_size =	sizeof(struct neighbour) + sizeof(struct in6_addr),
	.key_len =	sizeof(struct in6_addr),
	.hash =		ndisc_hash,
	.constructor =	ndisc_constructor,
	.pconstructor =	pndisc_constructor,
	.pdestructor =	pndisc_destructor,
	.proxy_redo =	pndisc_redo,
	.id =		"ndisc_cache",
	.parms = {
		.tbl =			&nd_tbl,
		.base_reachable_time =	30 * HZ,
		.retrans_time =	 1 * HZ,
		.gc_staletime =	60 * HZ,
		.reachable_time =		30 * HZ,
		.delay_probe_time =	 5 * HZ,
		.queue_len =		 3,
		.ucast_probes =	 3,
		.mcast_probes =	 3,
		.anycast_delay =	 1 * HZ,
		.proxy_delay =		(8 * HZ) / 10,
		.proxy_qlen =		64,
	},
	.gc_interval =	  30 * HZ,
	.gc_thresh1 =	 128,
	.gc_thresh2 =	 512,
	.gc_thresh3 =	1024,
};

/* ND options */
struct ndisc_options {
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	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
#ifdef CONFIG_IPV6_ROUTE_INFO
	struct nd_opt_hdr *nd_opts_ri;
	struct nd_opt_hdr *nd_opts_ri_end;
#endif
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};

#define nd_opts_src_lladdr	nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_opts_tgt_lladdr	nd_opt_array[ND_OPT_TARGET_LL_ADDR]
#define nd_opts_pi		nd_opt_array[ND_OPT_PREFIX_INFO]
#define nd_opts_pi_end		nd_opt_array[__ND_OPT_PREFIX_INFO_END]
#define nd_opts_rh		nd_opt_array[ND_OPT_REDIRECT_HDR]
#define nd_opts_mtu		nd_opt_array[ND_OPT_MTU]

#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)

/*
 * Return the padding between the option length and the start of the
 * link addr.  Currently only IP-over-InfiniBand needs this, although
 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
 * also need a pad of 2.
 */
static int ndisc_addr_option_pad(unsigned short type)
{
	switch (type) {
	case ARPHRD_INFINIBAND: return 2;
	default:                return 0;
	}
}

static inline int ndisc_opt_addr_space(struct net_device *dev)
{
	return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
}

static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
				  unsigned short addr_type)
{
	int space = NDISC_OPT_SPACE(data_len);
	int pad   = ndisc_addr_option_pad(addr_type);

	opt[0] = type;
	opt[1] = space>>3;

	memset(opt + 2, 0, pad);
	opt   += pad;
	space -= pad;

	memcpy(opt+2, data, data_len);
	data_len += 2;
	opt += data_len;
	if ((space -= data_len) > 0)
		memset(opt, 0, space);
	return opt + space;
}

static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
					    struct nd_opt_hdr *end)
{
	int type;
	if (!cur || !end || cur >= end)
		return NULL;
	type = cur->nd_opt_type;
	do {
		cur = ((void *)cur) + (cur->nd_opt_len << 3);
	} while(cur < end && cur->nd_opt_type != type);
	return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
}

static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
						 struct ndisc_options *ndopts)
{
	struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;

	if (!nd_opt || opt_len < 0 || !ndopts)
		return NULL;
	memset(ndopts, 0, sizeof(*ndopts));
	while (opt_len) {
		int l;
		if (opt_len < sizeof(struct nd_opt_hdr))
			return NULL;
		l = nd_opt->nd_opt_len << 3;
		if (opt_len < l || l == 0)
			return NULL;
		switch (nd_opt->nd_opt_type) {
		case ND_OPT_SOURCE_LL_ADDR:
		case ND_OPT_TARGET_LL_ADDR:
		case ND_OPT_MTU:
		case ND_OPT_REDIRECT_HDR:
			if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
				ND_PRINTK2(KERN_WARNING
					   "%s(): duplicated ND6 option found: type=%d\n",
					   __FUNCTION__,
					   nd_opt->nd_opt_type);
			} else {
				ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
			}
			break;
		case ND_OPT_PREFIX_INFO:
			ndopts->nd_opts_pi_end = nd_opt;
			if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
				ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
			break;
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#ifdef CONFIG_IPV6_ROUTE_INFO
		case ND_OPT_ROUTE_INFO:
			ndopts->nd_opts_ri_end = nd_opt;
			if (!ndopts->nd_opts_ri)
				ndopts->nd_opts_ri = nd_opt;
			break;
#endif
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		default:
			/*
			 * Unknown options must be silently ignored,
			 * to accommodate future extension to the protocol.
			 */
			ND_PRINTK2(KERN_NOTICE
				   "%s(): ignored unsupported option; type=%d, len=%d\n",
				   __FUNCTION__,
				   nd_opt->nd_opt_type, nd_opt->nd_opt_len);
		}
		opt_len -= l;
		nd_opt = ((void *)nd_opt) + l;
	}
	return ndopts;
}

static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
				      struct net_device *dev)
{
	u8 *lladdr = (u8 *)(p + 1);
	int lladdrlen = p->nd_opt_len << 3;
	int prepad = ndisc_addr_option_pad(dev->type);
	if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
		return NULL;
	return (lladdr + prepad);
}

int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
{
	switch (dev->type) {
	case ARPHRD_ETHER:
	case ARPHRD_IEEE802:	/* Not sure. Check it later. --ANK */
	case ARPHRD_FDDI:
		ipv6_eth_mc_map(addr, buf);
		return 0;
	case ARPHRD_IEEE802_TR:
		ipv6_tr_mc_map(addr,buf);
		return 0;
	case ARPHRD_ARCNET:
		ipv6_arcnet_mc_map(addr, buf);
		return 0;
	case ARPHRD_INFINIBAND:
		ipv6_ib_mc_map(addr, buf);
		return 0;
	default:
		if (dir) {
			memcpy(buf, dev->broadcast, dev->addr_len);
			return 0;
		}
	}
	return -EINVAL;
}

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EXPORT_SYMBOL(ndisc_mc_map);

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static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
{
	const u32 *p32 = pkey;
	u32 addr_hash, i;

	addr_hash = 0;
	for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
		addr_hash ^= *p32++;

	return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
}

static int ndisc_constructor(struct neighbour *neigh)
{
	struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
	struct net_device *dev = neigh->dev;
	struct inet6_dev *in6_dev;
	struct neigh_parms *parms;
	int is_multicast = ipv6_addr_is_multicast(addr);

	rcu_read_lock();
	in6_dev = in6_dev_get(dev);
	if (in6_dev == NULL) {
		rcu_read_unlock();
		return -EINVAL;
	}

	parms = in6_dev->nd_parms;
	__neigh_parms_put(neigh->parms);
	neigh->parms = neigh_parms_clone(parms);
	rcu_read_unlock();

	neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
	if (dev->hard_header == NULL) {
		neigh->nud_state = NUD_NOARP;
		neigh->ops = &ndisc_direct_ops;
		neigh->output = neigh->ops->queue_xmit;
	} else {
		if (is_multicast) {
			neigh->nud_state = NUD_NOARP;
			ndisc_mc_map(addr, neigh->ha, dev, 1);
		} else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
			neigh->nud_state = NUD_NOARP;
			memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
			if (dev->flags&IFF_LOOPBACK)
				neigh->type = RTN_LOCAL;
		} else if (dev->flags&IFF_POINTOPOINT) {
			neigh->nud_state = NUD_NOARP;
			memcpy(neigh->ha, dev->broadcast, dev->addr_len);
		}
		if (dev->hard_header_cache)
			neigh->ops = &ndisc_hh_ops;
		else
			neigh->ops = &ndisc_generic_ops;
		if (neigh->nud_state&NUD_VALID)
			neigh->output = neigh->ops->connected_output;
		else
			neigh->output = neigh->ops->output;
	}
	in6_dev_put(in6_dev);
	return 0;
}

static int pndisc_constructor(struct pneigh_entry *n)
{
	struct in6_addr *addr = (struct in6_addr*)&n->key;
	struct in6_addr maddr;
	struct net_device *dev = n->dev;

	if (dev == NULL || __in6_dev_get(dev) == NULL)
		return -EINVAL;
	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_inc(dev, &maddr);
	return 0;
}

static void pndisc_destructor(struct pneigh_entry *n)
{
	struct in6_addr *addr = (struct in6_addr*)&n->key;
	struct in6_addr maddr;
	struct net_device *dev = n->dev;

	if (dev == NULL || __in6_dev_get(dev) == NULL)
		return;
	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_dec(dev, &maddr);
}

/*
 *	Send a Neighbour Advertisement
 */

static inline void ndisc_flow_init(struct flowi *fl, u8 type,
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			    struct in6_addr *saddr, struct in6_addr *daddr,
			    int oif)
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{
	memset(fl, 0, sizeof(*fl));
	ipv6_addr_copy(&fl->fl6_src, saddr);
	ipv6_addr_copy(&fl->fl6_dst, daddr);
	fl->proto	 	= IPPROTO_ICMPV6;
	fl->fl_icmp_type	= type;
	fl->fl_icmp_code	= 0;
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	fl->oif			= oif;
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	security_sk_classify_flow(ndisc_socket->sk, fl);
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}

static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
		   struct in6_addr *daddr, struct in6_addr *solicited_addr,
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		   int router, int solicited, int override, int inc_opt)
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{
	struct in6_addr tmpaddr;
	struct inet6_ifaddr *ifp;
	struct inet6_dev *idev;
	struct flowi fl;
	struct dst_entry* dst;
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	struct sock *sk = ndisc_socket->sk;
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	struct in6_addr *src_addr;
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	struct nd_msg *msg;
	int len;
	struct sk_buff *skb;
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	int err;

	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);

	/* for anycast or proxy, solicited_addr != src_addr */
	ifp = ipv6_get_ifaddr(solicited_addr, dev, 1);
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	if (ifp) {
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		src_addr = solicited_addr;
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		if (ifp->flags & IFA_F_OPTIMISTIC)
			override = 0;
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		in6_ifa_put(ifp);
	} else {
		if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
			return;
		src_addr = &tmpaddr;
	}

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	ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr,
			dev->ifindex);
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	dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
	if (!dst)
		return;

	err = xfrm_lookup(&dst, &fl, NULL, 0);
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	if (err < 0)
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		return;

	if (inc_opt) {
		if (dev->addr_len)
			len += ndisc_opt_addr_space(dev);
		else
			inc_opt = 0;
	}

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	skb = sock_alloc_send_skb(sk,
				  (MAX_HEADER + sizeof(struct ipv6hdr) +
				   len + LL_RESERVED_SPACE(dev)),
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				  1, &err);

	if (skb == NULL) {
		ND_PRINTK0(KERN_ERR
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			   "ICMPv6 NA: %s() failed to allocate an skb.\n",
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			   __FUNCTION__);
		dst_release(dst);
		return;
	}

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
	ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len);

	msg = (struct nd_msg *)skb_put(skb, len);
	skb->h.raw = (unsigned char*)msg;

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	msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
	msg->icmph.icmp6_code = 0;
	msg->icmph.icmp6_cksum = 0;
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	msg->icmph.icmp6_unused = 0;
	msg->icmph.icmp6_router    = router;
	msg->icmph.icmp6_solicited = solicited;
	msg->icmph.icmp6_override  = override;
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	/* Set the target address. */
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	ipv6_addr_copy(&msg->target, solicited_addr);

	if (inc_opt)
		ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr,
				       dev->addr_len, dev->type);

	/* checksum */
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	msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
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						 IPPROTO_ICMPV6,
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						 csum_partial((__u8 *) msg,
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							      len, 0));

	skb->dst = dst;
	idev = in6_dev_get(dst->dev);
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	IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
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	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
	if (!err) {
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
	}

	if (likely(idev != NULL))
		in6_dev_put(idev);
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}
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void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
		   struct in6_addr *solicit,
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		   struct in6_addr *daddr, struct in6_addr *saddr)
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{
	struct flowi fl;
	struct dst_entry* dst;
	struct inet6_dev *idev;
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	struct sock *sk = ndisc_socket->sk;
	struct sk_buff *skb;
	struct nd_msg *msg;
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	struct in6_addr addr_buf;
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	int len;
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	int err;
	int send_llinfo;

	if (saddr == NULL) {
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		if (ipv6_get_lladdr(dev, &addr_buf,
				   (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
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			return;
		saddr = &addr_buf;
	}

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	ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr,
			dev->ifindex);
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	dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
	if (!dst)
		return;

	err = xfrm_lookup(&dst, &fl, NULL, 0);
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	if (err < 0)
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		return;

	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
	send_llinfo = dev->addr_len && !ipv6_addr_any(saddr);
	if (send_llinfo)
		len += ndisc_opt_addr_space(dev);

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	skb = sock_alloc_send_skb(sk,
				  (MAX_HEADER + sizeof(struct ipv6hdr) +
				   len + LL_RESERVED_SPACE(dev)),
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				  1, &err);
	if (skb == NULL) {
		ND_PRINTK0(KERN_ERR
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			   "ICMPv6 NA: %s() failed to allocate an skb.\n",
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			   __FUNCTION__);
		dst_release(dst);
		return;
	}

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
	ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);

	msg = (struct nd_msg *)skb_put(skb, len);
	skb->h.raw = (unsigned char*)msg;
	msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION;
	msg->icmph.icmp6_code = 0;
	msg->icmph.icmp6_cksum = 0;
	msg->icmph.icmp6_unused = 0;

	/* Set the target address. */
	ipv6_addr_copy(&msg->target, solicit);

	if (send_llinfo)
		ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
				       dev->addr_len, dev->type);

	/* checksum */
	msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr,
602
						 daddr, len,
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						 IPPROTO_ICMPV6,
604
						 csum_partial((__u8 *) msg,
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							      len, 0));
	/* send it! */
	skb->dst = dst;
	idev = in6_dev_get(dst->dev);
609
	IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
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	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
	if (!err) {
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS);
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
	}

	if (likely(idev != NULL))
		in6_dev_put(idev);
}

void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
		   struct in6_addr *daddr)
{
	struct flowi fl;
	struct dst_entry* dst;
	struct inet6_dev *idev;
	struct sock *sk = ndisc_socket->sk;
627 628
	struct sk_buff *skb;
	struct icmp6hdr *hdr;
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	__u8 * opt;
630
	int send_sllao = dev->addr_len;
631
	int len;
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	int err;

634 635 636 637 638 639 640 641 642 643 644

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	/*
	 * According to section 2.2 of RFC 4429, we must not
	 * send router solicitations with a sllao from
	 * optimistic addresses, but we may send the solicitation
	 * if we don't include the sllao.  So here we check
	 * if our address is optimistic, and if so, we
	 * supress the inclusion of the sllao.
	 */
	if (send_sllao) {
645
		struct inet6_ifaddr *ifp = ipv6_get_ifaddr(saddr, dev, 1);
646 647
		if (ifp) {
			if (ifp->flags & IFA_F_OPTIMISTIC)  {
648
				send_sllao = 0;
649
			}
650
			in6_ifa_put(ifp);
651 652 653 654 655
		} else {
			send_sllao = 0;
		}
	}
#endif
656 657
	ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr,
			dev->ifindex);
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	dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output);
	if (!dst)
		return;

	err = xfrm_lookup(&dst, &fl, NULL, 0);
664
	if (err < 0)
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		return;

	len = sizeof(struct icmp6hdr);
668
	if (send_sllao)
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		len += ndisc_opt_addr_space(dev);

671
	skb = sock_alloc_send_skb(sk,
672 673
				  (MAX_HEADER + sizeof(struct ipv6hdr) +
				   len + LL_RESERVED_SPACE(dev)),
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				  1, &err);
	if (skb == NULL) {
		ND_PRINTK0(KERN_ERR
677
			   "ICMPv6 RS: %s() failed to allocate an skb.\n",
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			   __FUNCTION__);
		dst_release(dst);
		return;
	}

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
	ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);

686 687 688 689 690 691
	hdr = (struct icmp6hdr *)skb_put(skb, len);
	skb->h.raw = (unsigned char*)hdr;
	hdr->icmp6_type = NDISC_ROUTER_SOLICITATION;
	hdr->icmp6_code = 0;
	hdr->icmp6_cksum = 0;
	hdr->icmp6_unused = 0;
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	opt = (u8*) (hdr + 1);

695
	if (send_sllao)
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		ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
				       dev->addr_len, dev->type);

	/* checksum */
	hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len,
					   IPPROTO_ICMPV6,
					   csum_partial((__u8 *) hdr, len, 0));

	/* send it! */
	skb->dst = dst;
	idev = in6_dev_get(dst->dev);
707
	IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
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	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
	if (!err) {
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS);
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
	}

	if (likely(idev != NULL))
		in6_dev_put(idev);
}
717

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static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
{
	/*
	 *	"The sender MUST return an ICMP
	 *	 destination unreachable"
	 */
	dst_link_failure(skb);
	kfree_skb(skb);
}

/* Called with locked neigh: either read or both */

static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
{
	struct in6_addr *saddr = NULL;
	struct in6_addr mcaddr;
	struct net_device *dev = neigh->dev;
	struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
	int probes = atomic_read(&neigh->probes);

	if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev, 1))
		saddr = &skb->nh.ipv6h->saddr;

	if ((probes -= neigh->parms->ucast_probes) < 0) {
		if (!(neigh->nud_state & NUD_VALID)) {
			ND_PRINTK1(KERN_DEBUG
				   "%s(): trying to ucast probe in NUD_INVALID: "
J
Joe Perches 已提交
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				   NIP6_FMT "\n",
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747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
				   __FUNCTION__,
				   NIP6(*target));
		}
		ndisc_send_ns(dev, neigh, target, target, saddr);
	} else if ((probes -= neigh->parms->app_probes) < 0) {
#ifdef CONFIG_ARPD
		neigh_app_ns(neigh);
#endif
	} else {
		addrconf_addr_solict_mult(target, &mcaddr);
		ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
	}
}

static void ndisc_recv_ns(struct sk_buff *skb)
{
	struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
	struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
	struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
	u8 *lladdr = NULL;
	u32 ndoptlen = skb->tail - msg->opt;
	struct ndisc_options ndopts;
	struct net_device *dev = skb->dev;
	struct inet6_ifaddr *ifp;
	struct inet6_dev *idev = NULL;
	struct neighbour *neigh;
773
	struct pneigh_entry *pneigh = NULL;
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	int dad = ipv6_addr_any(saddr);
	int inc;
776
	int is_router;
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	if (ipv6_addr_is_multicast(&msg->target)) {
779
		ND_PRINTK2(KERN_WARNING
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			   "ICMPv6 NS: multicast target address");
		return;
	}

	/*
	 * RFC2461 7.1.1:
	 * DAD has to be destined for solicited node multicast address.
	 */
	if (dad &&
	    !(daddr->s6_addr32[0] == htonl(0xff020000) &&
	      daddr->s6_addr32[1] == htonl(0x00000000) &&
	      daddr->s6_addr32[2] == htonl(0x00000001) &&
	      daddr->s6_addr [12] == 0xff )) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NS: bad DAD packet (wrong destination)\n");
		return;
	}

	if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
799
		ND_PRINTK2(KERN_WARNING
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			   "ICMPv6 NS: invalid ND options\n");
		return;
	}

	if (ndopts.nd_opts_src_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
		if (!lladdr) {
			ND_PRINTK2(KERN_WARNING
				   "ICMPv6 NS: invalid link-layer address length\n");
			return;
		}

		/* RFC2461 7.1.1:
813 814
		 *	If the IP source address is the unspecified address,
		 *	there MUST NOT be source link-layer address option
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		 *	in the message.
		 */
		if (dad) {
818
			ND_PRINTK2(KERN_WARNING
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				   "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
			return;
		}
	}

	inc = ipv6_addr_is_multicast(daddr);

	if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) {
827 828 829 830

		if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
			if (dad) {
				if (dev->type == ARPHRD_IEEE802_TR) {
831 832
					const unsigned char *sadr;
					sadr = skb_mac_header(skb);
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
					if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
					    sadr[9] == dev->dev_addr[1] &&
					    sadr[10] == dev->dev_addr[2] &&
					    sadr[11] == dev->dev_addr[3] &&
					    sadr[12] == dev->dev_addr[4] &&
					    sadr[13] == dev->dev_addr[5]) {
						/* looped-back to us */
						goto out;
					}
				}

				/*
				 * We are colliding with another node
				 * who is doing DAD
				 * so fail our DAD process
				 */
				addrconf_dad_failure(ifp);
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				goto out;
851 852 853 854 855 856 857 858
			} else {
				/*
				 * This is not a dad solicitation.
				 * If we are an optimistic node,
				 * we should respond.
				 * Otherwise, we should ignore it.
				 */
				if (!(ifp->flags & IFA_F_OPTIMISTIC))
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					goto out;
			}
		}

		idev = ifp->idev;
	} else {
		idev = in6_dev_get(dev);
		if (!idev) {
			/* XXX: count this drop? */
			return;
		}

		if (ipv6_chk_acast_addr(dev, &msg->target) ||
872
		    (idev->cnf.forwarding &&
873
		     (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
874 875
		     (pneigh = pneigh_lookup(&nd_tbl,
					     &msg->target, dev, 0)) != NULL)) {
876
			if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
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			    skb->pkt_type != PACKET_HOST &&
			    inc != 0 &&
			    idev->nd_parms->proxy_delay != 0) {
				/*
				 * for anycast or proxy,
882 883
				 * sender should delay its response
				 * by a random time between 0 and
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				 * MAX_ANYCAST_DELAY_TIME seconds.
				 * (RFC2461) -- yoshfuji
				 */
				struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
				if (n)
					pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
				goto out;
			}
		} else
			goto out;
	}

896
	is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding);
897

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	if (dad) {
		struct in6_addr maddr;

		ipv6_addr_all_nodes(&maddr);
		ndisc_send_na(dev, NULL, &maddr, &msg->target,
903
			      is_router, 0, (ifp != NULL), 1);
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		goto out;
	}

	if (inc)
		NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
	else
		NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);

912
	/*
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	 *	update / create cache entry
	 *	for the source address
	 */
	neigh = __neigh_lookup(&nd_tbl, saddr, dev,
			       !inc || lladdr || !dev->addr_len);
	if (neigh)
919
		neigh_update(neigh, lladdr, NUD_STALE,
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920 921 922 923
			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE);
	if (neigh || !dev->hard_header) {
		ndisc_send_na(dev, neigh, saddr, &msg->target,
924
			      is_router,
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			      1, (ifp != NULL && inc), inc);
		if (neigh)
			neigh_release(neigh);
	}

out:
	if (ifp)
		in6_ifa_put(ifp);
	else
		in6_dev_put(idev);

	return;
}

static void ndisc_recv_na(struct sk_buff *skb)
{
	struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
	struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
	struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
	u8 *lladdr = NULL;
	u32 ndoptlen = skb->tail - msg->opt;
	struct ndisc_options ndopts;
	struct net_device *dev = skb->dev;
	struct inet6_ifaddr *ifp;
	struct neighbour *neigh;

	if (skb->len < sizeof(struct nd_msg)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NA: packet too short\n");
		return;
	}

	if (ipv6_addr_is_multicast(&msg->target)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NA: target address is multicast.\n");
		return;
	}

	if (ipv6_addr_is_multicast(daddr) &&
	    msg->icmph.icmp6_solicited) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NA: solicited NA is multicasted.\n");
		return;
	}
969

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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
	if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NS: invalid ND option\n");
		return;
	}
	if (ndopts.nd_opts_tgt_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
		if (!lladdr) {
			ND_PRINTK2(KERN_WARNING
				   "ICMPv6 NA: invalid link-layer address length\n");
			return;
		}
	}
	if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) {
		if (ifp->flags & IFA_F_TENTATIVE) {
			addrconf_dad_failure(ifp);
			return;
		}
		/* What should we make now? The advertisement
		   is invalid, but ndisc specs say nothing
		   about it. It could be misconfiguration, or
		   an smart proxy agent tries to help us :-)
		 */
		ND_PRINTK1(KERN_WARNING
			   "ICMPv6 NA: someone advertises our address on %s!\n",
			   ifp->idev->dev->name);
		in6_ifa_put(ifp);
		return;
	}
	neigh = neigh_lookup(&nd_tbl, &msg->target, dev);

	if (neigh) {
		u8 old_flags = neigh->flags;

		if (neigh->nud_state & NUD_FAILED)
			goto out;

1007 1008 1009 1010 1011 1012
		/*
		 * Don't update the neighbor cache entry on a proxy NA from
		 * ourselves because either the proxied node is off link or it
		 * has already sent a NA to us.
		 */
		if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
1013 1014 1015
		    ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
		    pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
			/* XXX: idev->cnf.prixy_ndp */
1016
			goto out;
1017
		}
1018

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1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
		neigh_update(neigh, lladdr,
			     msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
			     (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
			     NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
			     (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));

		if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
			/*
			 * Change: router to host
			 */
			struct rt6_info *rt;
			rt = rt6_get_dflt_router(saddr, dev);
			if (rt)
1033
				ip6_del_rt(rt);
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1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
		}

out:
		neigh_release(neigh);
	}
}

static void ndisc_recv_rs(struct sk_buff *skb)
{
	struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw;
	unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
	struct neighbour *neigh;
	struct inet6_dev *idev;
	struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
	struct ndisc_options ndopts;
	u8 *lladdr = NULL;

	if (skb->len < sizeof(*rs_msg))
		return;

	idev = in6_dev_get(skb->dev);
	if (!idev) {
		if (net_ratelimit())
			ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
		return;
	}

	/* Don't accept RS if we're not in router mode */
	if (!idev->cnf.forwarding)
		goto out;

	/*
	 * Don't update NCE if src = ::;
	 * this implies that the source node has no ip address assigned yet.
	 */
	if (ipv6_addr_any(saddr))
		goto out;

	/* Parse ND options */
	if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
		if (net_ratelimit())
			ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
		goto out;
	}

	if (ndopts.nd_opts_src_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
					     skb->dev);
		if (!lladdr)
			goto out;
	}

	neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
	if (neigh) {
		neigh_update(neigh, lladdr, NUD_STALE,
			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
		neigh_release(neigh);
	}
out:
	in6_dev_put(idev);
}

static void ndisc_router_discovery(struct sk_buff *skb)
{
1100
	struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
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	struct neighbour *neigh = NULL;
	struct inet6_dev *in6_dev;
1103
	struct rt6_info *rt = NULL;
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1104 1105 1106
	int lifetime;
	struct ndisc_options ndopts;
	int optlen;
1107
	unsigned int pref = 0;
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	__u8 * opt = (__u8 *)(ra_msg + 1);

	optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg);

	if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 RA: source address is not link-local.\n");
		return;
	}
	if (optlen < 0) {
1119
		ND_PRINTK2(KERN_WARNING
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			   "ICMPv6 RA: packet too short\n");
		return;
	}

	/*
	 *	set the RA_RECV flag in the interface
	 */

	in6_dev = in6_dev_get(skb->dev);
	if (in6_dev == NULL) {
		ND_PRINTK0(KERN_ERR
			   "ICMPv6 RA: can't find inet6 device for %s.\n",
			   skb->dev->name);
		return;
	}
	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
		in6_dev_put(in6_dev);
		return;
	}

	if (!ndisc_parse_options(opt, optlen, &ndopts)) {
		in6_dev_put(in6_dev);
		ND_PRINTK2(KERN_WARNING
			   "ICMP6 RA: invalid ND options\n");
		return;
	}

	if (in6_dev->if_flags & IF_RS_SENT) {
		/*
		 *	flag that an RA was received after an RS was sent
		 *	out on this interface.
		 */
		in6_dev->if_flags |= IF_RA_RCVD;
	}

	/*
	 * Remember the managed/otherconf flags from most recently
	 * received RA message (RFC 2462) -- yoshfuji
	 */
	in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
				IF_RA_OTHERCONF)) |
				(ra_msg->icmph.icmp6_addrconf_managed ?
					IF_RA_MANAGED : 0) |
				(ra_msg->icmph.icmp6_addrconf_other ?
					IF_RA_OTHERCONF : 0);

1166 1167 1168
	if (!in6_dev->cnf.accept_ra_defrtr)
		goto skip_defrtr;

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	lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);

1171 1172 1173
#ifdef CONFIG_IPV6_ROUTER_PREF
	pref = ra_msg->icmph.icmp6_router_pref;
	/* 10b is handled as if it were 00b (medium) */
1174 1175
	if (pref == ICMPV6_ROUTER_PREF_INVALID ||
	    in6_dev->cnf.accept_ra_rtr_pref)
1176 1177 1178
		pref = ICMPV6_ROUTER_PREF_MEDIUM;
#endif

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	rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);

	if (rt)
		neigh = rt->rt6i_nexthop;

	if (rt && lifetime == 0) {
		neigh_clone(neigh);
1186
		ip6_del_rt(rt);
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		rt = NULL;
	}

	if (rt == NULL && lifetime) {
		ND_PRINTK3(KERN_DEBUG
			   "ICMPv6 RA: adding default router.\n");

1194
		rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref);
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		if (rt == NULL) {
			ND_PRINTK0(KERN_ERR
				   "ICMPv6 RA: %s() failed to add default route.\n",
				   __FUNCTION__);
			in6_dev_put(in6_dev);
			return;
		}

		neigh = rt->rt6i_nexthop;
		if (neigh == NULL) {
			ND_PRINTK0(KERN_ERR
				   "ICMPv6 RA: %s() got default router without neighbour.\n",
				   __FUNCTION__);
			dst_release(&rt->u.dst);
			in6_dev_put(in6_dev);
			return;
		}
		neigh->flags |= NTF_ROUTER;
1213 1214
	} else if (rt) {
		rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
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	}

	if (rt)
		rt->rt6i_expires = jiffies + (HZ * lifetime);

	if (ra_msg->icmph.icmp6_hop_limit) {
		in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
		if (rt)
			rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
	}

1226 1227
skip_defrtr:

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	/*
	 *	Update Reachable Time and Retrans Timer
	 */

	if (in6_dev->nd_parms) {
		unsigned long rtime = ntohl(ra_msg->retrans_timer);

		if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
			rtime = (rtime*HZ)/1000;
			if (rtime < HZ/10)
				rtime = HZ/10;
			in6_dev->nd_parms->retrans_time = rtime;
			in6_dev->tstamp = jiffies;
			inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
		}

		rtime = ntohl(ra_msg->reachable_time);
		if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
			rtime = (rtime*HZ)/1000;

			if (rtime < HZ/10)
				rtime = HZ/10;

			if (rtime != in6_dev->nd_parms->base_reachable_time) {
				in6_dev->nd_parms->base_reachable_time = rtime;
				in6_dev->nd_parms->gc_staletime = 3 * rtime;
				in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
				in6_dev->tstamp = jiffies;
				inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
			}
		}
	}

	/*
	 *	Process options.
	 */

	if (!neigh)
		neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr,
				       skb->dev, 1);
	if (neigh) {
		u8 *lladdr = NULL;
		if (ndopts.nd_opts_src_lladdr) {
			lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
						     skb->dev);
			if (!lladdr) {
				ND_PRINTK2(KERN_WARNING
					   "ICMPv6 RA: invalid link-layer address length\n");
				goto out;
			}
		}
		neigh_update(neigh, lladdr, NUD_STALE,
			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
			     NEIGH_UPDATE_F_ISROUTER);
	}

1286
#ifdef CONFIG_IPV6_ROUTE_INFO
1287
	if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1288 1289 1290 1291
		struct nd_opt_hdr *p;
		for (p = ndopts.nd_opts_ri;
		     p;
		     p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1292 1293
			if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
				continue;
1294 1295 1296 1297 1298 1299
			rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
				      &skb->nh.ipv6h->saddr);
		}
	}
#endif

1300
	if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
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		struct nd_opt_hdr *p;
		for (p = ndopts.nd_opts_pi;
		     p;
		     p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
			addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
		}
	}

	if (ndopts.nd_opts_mtu) {
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		__be32 n;
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		u32 mtu;

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		memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
		mtu = ntohl(n);
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		if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
			ND_PRINTK2(KERN_WARNING
				   "ICMPv6 RA: invalid mtu: %d\n",
				   mtu);
		} else if (in6_dev->cnf.mtu6 != mtu) {
			in6_dev->cnf.mtu6 = mtu;

			if (rt)
				rt->u.dst.metrics[RTAX_MTU-1] = mtu;

			rt6_mtu_change(skb->dev, mtu);
		}
	}
1329

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	if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 RA: invalid RA options");
	}
out:
	if (rt)
		dst_release(&rt->u.dst);
	else if (neigh)
		neigh_release(neigh);
	in6_dev_put(in6_dev);
}

static void ndisc_redirect_rcv(struct sk_buff *skb)
{
	struct inet6_dev *in6_dev;
	struct icmp6hdr *icmph;
	struct in6_addr *dest;
	struct in6_addr *target;	/* new first hop to destination */
	struct neighbour *neigh;
	int on_link = 0;
	struct ndisc_options ndopts;
	int optlen;
	u8 *lladdr = NULL;

	if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: source address is not link-local.\n");
		return;
	}

	optlen = skb->tail - skb->h.raw;
	optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);

	if (optlen < 0) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: packet too short\n");
		return;
	}

	icmph = (struct icmp6hdr *) skb->h.raw;
	target = (struct in6_addr *) (icmph + 1);
	dest = target + 1;

	if (ipv6_addr_is_multicast(dest)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: destination address is multicast.\n");
		return;
	}

	if (ipv6_addr_equal(dest, target)) {
		on_link = 1;
	} else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
1382
		ND_PRINTK2(KERN_WARNING
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			   "ICMPv6 Redirect: target address is not link-local.\n");
		return;
	}

	in6_dev = in6_dev_get(skb->dev);
	if (!in6_dev)
		return;
	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
		in6_dev_put(in6_dev);
		return;
	}

1395
	/* RFC2461 8.1:
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	 *	The IP source address of the Redirect MUST be the same as the current
	 *	first-hop router for the specified ICMP Destination Address.
	 */
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	if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: invalid ND options\n");
		in6_dev_put(in6_dev);
		return;
	}
	if (ndopts.nd_opts_tgt_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
					     skb->dev);
		if (!lladdr) {
			ND_PRINTK2(KERN_WARNING
				   "ICMPv6 Redirect: invalid link-layer address length\n");
			in6_dev_put(in6_dev);
			return;
		}
	}

	neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
	if (neigh) {
1419 1420
		rt6_redirect(dest, &skb->nh.ipv6h->daddr,
			     &skb->nh.ipv6h->saddr, neigh, lladdr,
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			     on_link);
		neigh_release(neigh);
	}
	in6_dev_put(in6_dev);
}

void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
			 struct in6_addr *target)
{
	struct sock *sk = ndisc_socket->sk;
	int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
	struct sk_buff *buff;
	struct icmp6hdr *icmph;
	struct in6_addr saddr_buf;
	struct in6_addr *addrp;
	struct net_device *dev;
	struct rt6_info *rt;
	struct dst_entry *dst;
	struct inet6_dev *idev;
	struct flowi fl;
	u8 *opt;
	int rd_len;
	int err;
	int hlen;
	u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;

	dev = skb->dev;

1449
	if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
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		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: no link-local address on %s\n",
			   dev->name);
1453 1454
		return;
	}
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1456 1457 1458 1459 1460 1461 1462
	if (!ipv6_addr_equal(&skb->nh.ipv6h->daddr, target) &&
	    !(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
		ND_PRINTK2(KERN_WARNING
			"ICMPv6 Redirect: target address is not link-local.\n");
		return;
	}

1463 1464
	ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr,
			dev->ifindex);
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	dst = ip6_route_output(NULL, &fl);
	if (dst == NULL)
		return;

	err = xfrm_lookup(&dst, &fl, NULL, 0);
1471
	if (err)
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		return;

	rt = (struct rt6_info *) dst;

	if (rt->rt6i_flags & RTF_GATEWAY) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 Redirect: destination is not a neighbour.\n");
		dst_release(dst);
		return;
	}
	if (!xrlim_allow(dst, 1*HZ)) {
		dst_release(dst);
		return;
	}

	if (dev->addr_len) {
		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID) {
			memcpy(ha_buf, neigh->ha, dev->addr_len);
			read_unlock_bh(&neigh->lock);
			ha = ha_buf;
			len += ndisc_opt_addr_space(dev);
		} else
			read_unlock_bh(&neigh->lock);
	}

	rd_len = min_t(unsigned int,
		     IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
	rd_len &= ~0x7;
	len += rd_len;

1503 1504 1505
	buff = sock_alloc_send_skb(sk,
				   (MAX_HEADER + sizeof(struct ipv6hdr) +
				    len + LL_RESERVED_SPACE(dev)),
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				   1, &err);
	if (buff == NULL) {
		ND_PRINTK0(KERN_ERR
			   "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
			   __FUNCTION__);
		dst_release(dst);
		return;
	}

	hlen = 0;

	skb_reserve(buff, LL_RESERVED_SPACE(dev));
	ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr,
		   IPPROTO_ICMPV6, len);

	icmph = (struct icmp6hdr *)skb_put(buff, len);
	buff->h.raw = (unsigned char*)icmph;

	memset(icmph, 0, sizeof(struct icmp6hdr));
	icmph->icmp6_type = NDISC_REDIRECT;

	/*
	 *	copy target and destination addresses
	 */

	addrp = (struct in6_addr *)(icmph + 1);
	ipv6_addr_copy(addrp, target);
	addrp++;
	ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr);

	opt = (u8*) (addrp + 1);

	/*
	 *	include target_address option
	 */

	if (ha)
		opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
					     dev->addr_len, dev->type);

	/*
	 *	build redirect option and copy skb over to the new packet.
	 */

1550
	memset(opt, 0, 8);
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	*(opt++) = ND_OPT_REDIRECT_HDR;
	*(opt++) = (rd_len >> 3);
	opt += 6;

	memcpy(opt, skb->nh.ipv6h, rd_len - 8);

	icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr,
					     len, IPPROTO_ICMPV6,
					     csum_partial((u8 *) icmph, len, 0));

	buff->dst = dst;
	idev = in6_dev_get(dst->dev);
1563
	IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
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	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output);
	if (!err) {
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS);
		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
	}

	if (likely(idev != NULL))
		in6_dev_put(idev);
}

static void pndisc_redo(struct sk_buff *skb)
{
1576
	ndisc_recv_ns(skb);
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	kfree_skb(skb);
}

int ndisc_rcv(struct sk_buff *skb)
{
	struct nd_msg *msg;

	if (!pskb_may_pull(skb, skb->len))
		return 0;

	msg = (struct nd_msg *) skb->h.raw;

	__skb_push(skb, skb->data-skb->h.raw);

	if (skb->nh.ipv6h->hop_limit != 255) {
		ND_PRINTK2(KERN_WARNING
			   "ICMPv6 NDISC: invalid hop-limit: %d\n",
			   skb->nh.ipv6h->hop_limit);
		return 0;
	}

	if (msg->icmph.icmp6_code != 0) {
1599
		ND_PRINTK2(KERN_WARNING
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			   "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
			   msg->icmph.icmp6_code);
		return 0;
	}

1605 1606
	memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));

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	switch (msg->icmph.icmp6_type) {
	case NDISC_NEIGHBOUR_SOLICITATION:
		ndisc_recv_ns(skb);
		break;

	case NDISC_NEIGHBOUR_ADVERTISEMENT:
		ndisc_recv_na(skb);
		break;

	case NDISC_ROUTER_SOLICITATION:
		ndisc_recv_rs(skb);
		break;

	case NDISC_ROUTER_ADVERTISEMENT:
		ndisc_router_discovery(skb);
		break;

	case NDISC_REDIRECT:
		ndisc_redirect_rcv(skb);
		break;
	};

	return 0;
}

static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;

	switch (event) {
	case NETDEV_CHANGEADDR:
		neigh_changeaddr(&nd_tbl, dev);
		fib6_run_gc(~0UL);
		break;
	case NETDEV_DOWN:
		neigh_ifdown(&nd_tbl, dev);
		fib6_run_gc(~0UL);
		break;
	default:
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block ndisc_netdev_notifier = {
	.notifier_call = ndisc_netdev_event,
};

#ifdef CONFIG_SYSCTL
static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
					 const char *func, const char *dev_name)
{
	static char warncomm[TASK_COMM_LEN];
	static int warned;
	if (strcmp(warncomm, current->comm) && warned < 5) {
		strcpy(warncomm, current->comm);
		printk(KERN_WARNING
			"process `%s' is using deprecated sysctl (%s) "
			"net.ipv6.neigh.%s.%s; "
			"Use net.ipv6.neigh.%s.%s_ms "
			"instead.\n",
			warncomm, func,
			dev_name, ctl->procname,
			dev_name, ctl->procname);
		warned++;
	}
}

int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct net_device *dev = ctl->extra1;
	struct inet6_dev *idev;
	int ret;

	if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
	    ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
		ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");

	switch (ctl->ctl_name) {
	case NET_NEIGH_RETRANS_TIME:
		ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
		break;
	case NET_NEIGH_REACHABLE_TIME:
		ret = proc_dointvec_jiffies(ctl, write,
					    filp, buffer, lenp, ppos);
		break;
	case NET_NEIGH_RETRANS_TIME_MS:
	case NET_NEIGH_REACHABLE_TIME_MS:
		ret = proc_dointvec_ms_jiffies(ctl, write,
					       filp, buffer, lenp, ppos);
		break;
	default:
		ret = -1;
	}

	if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
		if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
		    ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
			idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
		idev->tstamp = jiffies;
		inet6_ifinfo_notify(RTM_NEWLINK, idev);
		in6_dev_put(idev);
	}
	return ret;
}

static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
					int nlen, void __user *oldval,
					size_t __user *oldlenp,
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					void __user *newval, size_t newlen)
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{
	struct net_device *dev = ctl->extra1;
	struct inet6_dev *idev;
	int ret;

	if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
	    ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
		ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");

	switch (ctl->ctl_name) {
	case NET_NEIGH_REACHABLE_TIME:
		ret = sysctl_jiffies(ctl, name, nlen,
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				     oldval, oldlenp, newval, newlen);
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		break;
	case NET_NEIGH_RETRANS_TIME_MS:
	case NET_NEIGH_REACHABLE_TIME_MS:
		 ret = sysctl_ms_jiffies(ctl, name, nlen,
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					 oldval, oldlenp, newval, newlen);
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		 break;
	default:
		ret = 0;
	}

	if (newval && newlen && ret > 0 &&
	    dev && (idev = in6_dev_get(dev)) != NULL) {
		if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
		    ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
			idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
		idev->tstamp = jiffies;
		inet6_ifinfo_notify(RTM_NEWLINK, idev);
		in6_dev_put(idev);
	}

	return ret;
}

#endif

int __init ndisc_init(struct net_proto_family *ops)
{
	struct ipv6_pinfo *np;
	struct sock *sk;
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	int err;
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	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket);
	if (err < 0) {
		ND_PRINTK0(KERN_ERR
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			   "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
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			   err);
		ndisc_socket = NULL; /* For safety. */
		return err;
	}

	sk = ndisc_socket->sk;
	np = inet6_sk(sk);
	sk->sk_allocation = GFP_ATOMIC;
	np->hop_limit = 255;
	/* Do not loopback ndisc messages */
	np->mc_loop = 0;
	sk->sk_prot->unhash(sk);

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	/*
	 * Initialize the neighbour table
	 */

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	neigh_table_init(&nd_tbl);

#ifdef CONFIG_SYSCTL
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	neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH,
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			      "ipv6",
			      &ndisc_ifinfo_sysctl_change,
			      &ndisc_ifinfo_sysctl_strategy);
#endif

	register_netdevice_notifier(&ndisc_netdev_notifier);
	return 0;
}

void ndisc_cleanup(void)
{
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	unregister_netdevice_notifier(&ndisc_netdev_notifier);
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#ifdef CONFIG_SYSCTL
	neigh_sysctl_unregister(&nd_tbl.parms);
#endif
	neigh_table_clear(&nd_tbl);
	sock_release(ndisc_socket);
	ndisc_socket = NULL; /* For safety. */
}