/*
* Neighbour Discovery for IPv6
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
* 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(x...) printk(KERN_DEBUG x)
#define ND_NOPRINTK(x...) do { ; } while(0)
#define ND_PRINTK0 ND_PRINTK
#define ND_PRINTK1 ND_NOPRINTK
#define ND_PRINTK2 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
#include <linux/module.h>
#include <linux/config.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>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.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/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 {
struct nd_opt_hdr *nd_opt_array[7];
struct nd_opt_hdr *nd_opt_piend;
};
#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_piend
#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)
static u8 *ndisc_fill_option(u8 *opt, int type, void *data, int data_len)
{
int space = NDISC_OPT_SPACE(data_len);
opt[0] = type;
opt[1] = space>>3;
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("ndisc_parse_options(): duplicated ND6 option found: type=%d\n",
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;
default:
/*
* Unknown options must be silently ignored,
* to accommodate future extension to the protocol.
*/
ND_PRINTK2(KERN_WARNING
"ndisc_parse_options(): ignored unsupported option; type=%d, len=%d\n",
nd_opt->nd_opt_type, nd_opt->nd_opt_len);
}
opt_len -= l;
nd_opt = ((void *)nd_opt) + l;
}
return ndopts;
}
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;
default:
if (dir) {
memcpy(buf, dev->broadcast, dev->addr_len);
return 0;
}
}
return -EINVAL;
}
static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
{
u32 hash_val;
hash_val = *(u32*)(pkey + sizeof(struct in6_addr) - 4);
hash_val ^= (hash_val>>16);
hash_val ^= hash_val>>8;
hash_val ^= hash_val>>3;
hash_val = (hash_val^dev->ifindex)&NEIGH_HASHMASK;
return hash_val;
}
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 = in6_dev_get(dev);
int addr_type;
if (in6_dev == NULL)
return -EINVAL;
addr_type = ipv6_addr_type(addr);
if (in6_dev->nd_parms)
neigh->parms = in6_dev->nd_parms;
if (addr_type&IPV6_ADDR_MULTICAST)
neigh->type = RTN_MULTICAST;
else
neigh->type = 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 (addr_type&IPV6_ADDR_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);
}
static int
ndisc_build_ll_hdr(struct sk_buff *skb, struct net_device *dev,
struct in6_addr *daddr, struct neighbour *neigh, int len)
{
unsigned char ha[MAX_ADDR_LEN];
unsigned char *h_dest = NULL;
if (dev->hard_header) {
if (ipv6_addr_type(daddr) & IPV6_ADDR_MULTICAST) {
ndisc_mc_map(daddr, ha, dev, 1);
h_dest = ha;
} else if (neigh) {
read_lock_bh(&neigh->lock);
if (neigh->nud_state&NUD_VALID) {
memcpy(ha, neigh->ha, dev->addr_len);
h_dest = ha;
}
read_unlock_bh(&neigh->lock);
} else {
neigh = neigh_lookup(&nd_tbl, daddr, dev);
if (neigh) {
read_lock_bh(&neigh->lock);
if (neigh->nud_state&NUD_VALID) {
memcpy(ha, neigh->ha, dev->addr_len);
h_dest = ha;
}
read_unlock_bh(&neigh->lock);
neigh_release(neigh);
}
}
if (dev->hard_header(skb, dev, ETH_P_IPV6, h_dest, NULL, len) < 0)
return 0;
}
return 1;
}
/*
* Send a Neighbour Advertisement
*/
static int ndisc_output(struct sk_buff *skb)
{
if (skb) {
struct neighbour *neigh = (skb->dst ? skb->dst->neighbour : NULL);
if (ndisc_build_ll_hdr(skb, skb->dev, &skb->nh.ipv6h->daddr, neigh, skb->len) == 0) {
kfree_skb(skb);
return -EINVAL;
}
dev_queue_xmit(skb);
return 0;
}
return -EINVAL;
}
static inline void ndisc_flow_init(struct flowi *fl, u8 type,
struct in6_addr *saddr, struct in6_addr *daddr)
{
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;
}
static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
struct in6_addr *daddr, struct in6_addr *solicited_addr,
int router, int solicited, int override, int inc_opt)
{
struct in6_addr tmpaddr;
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct flowi fl;
struct dst_entry* dst;
struct sock *sk = ndisc_socket->sk;
struct in6_addr *src_addr;
struct nd_msg *msg;
int len;
struct sk_buff *skb;
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);
if (ifp) {
src_addr = solicited_addr;
in6_ifa_put(ifp);
} else {
if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr, 0))
return;
src_addr = &tmpaddr;
}
ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr);
dst = ndisc_dst_alloc(dev, neigh, ndisc_output);
if (!dst)
return;
err = xfrm_lookup(&dst, &fl, NULL, 0);
if (err < 0) {
dst_release(dst);
return;
}
if (inc_opt) {
if (dev->addr_len)
len += NDISC_OPT_SPACE(dev->addr_len);
else
inc_opt = 0;
}
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
1, &err);
if (skb == NULL) {
ND_PRINTK1("send_na: alloc skb failed\n");
dst_release(dst);
return;
}
skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len);
skb->h.raw = (unsigned char*) msg = (struct nd_msg *) skb_put(skb, len);
msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
msg->icmph.icmp6_code = 0;
msg->icmph.icmp6_cksum = 0;
msg->icmph.icmp6_unused = 0;
msg->icmph.icmp6_router = router;
msg->icmph.icmp6_solicited = solicited;
msg->icmph.icmp6_override = !!override;
/* Set the target address. */
ipv6_addr_copy(&msg->target, solicited_addr);
if (inc_opt)
ndisc_fill_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, dev->addr_len);
/* checksum */
msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
IPPROTO_ICMPV6,
csum_partial((__u8 *) msg,
len, 0));
skb->dst = dst;
idev = in6_dev_get(dst->dev);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
if (!err) {
ICMP6_INC_STATS(idev, Icmp6OutNeighborAdvertisements);
ICMP6_INC_STATS(idev, Icmp6OutMsgs);
}
if (likely(idev != NULL))
in6_dev_put(idev);
}
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
struct in6_addr *solicit,
struct in6_addr *daddr, struct in6_addr *saddr)
{
struct flowi fl;
struct dst_entry* dst;
struct inet6_dev *idev;
struct sock *sk = ndisc_socket->sk;
struct sk_buff *skb;
struct nd_msg *msg;
struct in6_addr addr_buf;
int len;
int err;
int send_llinfo;
if (saddr == NULL) {
if (ipv6_get_lladdr(dev, &addr_buf))
return;
saddr = &addr_buf;
}
ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr);
dst = ndisc_dst_alloc(dev, neigh, ndisc_output);
if (!dst)
return;
err = xfrm_lookup(&dst, &fl, NULL, 0);
if (err < 0) {
dst_release(dst);
return;
}
len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
send_llinfo = dev->addr_len && ipv6_addr_type(saddr) != IPV6_ADDR_ANY;
if (send_llinfo)
len += NDISC_OPT_SPACE(dev->addr_len);
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
1, &err);
if (skb == NULL) {
ND_PRINTK1("send_ns: alloc skb failed\n");
dst_release(dst);
return;
}
skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
skb->h.raw = (unsigned char*) msg = (struct nd_msg *)skb_put(skb, len);
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_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
/* checksum */
msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr,
daddr, len,
IPPROTO_ICMPV6,
csum_partial((__u8 *) msg,
len, 0));
/* send it! */
skb->dst = dst;
idev = in6_dev_get(dst->dev);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
if (!err) {
ICMP6_INC_STATS(idev, Icmp6OutNeighborSolicits);
ICMP6_INC_STATS(idev, Icmp6OutMsgs);
}
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;
struct sk_buff *skb;
struct icmp6hdr *hdr;
__u8 * opt;
int len;
int err;
ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr);
dst = ndisc_dst_alloc(dev, NULL, ndisc_output);
if (!dst)
return;
err = xfrm_lookup(&dst, &fl, NULL, 0);
if (err < 0) {
dst_release(dst);
return;
}
len = sizeof(struct icmp6hdr);
if (dev->addr_len)
len += NDISC_OPT_SPACE(dev->addr_len);
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
1, &err);
if (skb == NULL) {
ND_PRINTK1("send_ns: alloc skb failed\n");
dst_release(dst);
return;
}
skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
skb->h.raw = (unsigned char*) hdr = (struct icmp6hdr *) skb_put(skb, len);
hdr->icmp6_type = NDISC_ROUTER_SOLICITATION;
hdr->icmp6_code = 0;
hdr->icmp6_cksum = 0;
hdr->icmp6_unused = 0;
opt = (u8*) (hdr + 1);
if (dev->addr_len)
ndisc_fill_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
/* 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);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
if (!err) {
ICMP6_INC_STATS(idev, Icmp6OutRouterSolicits);
ICMP6_INC_STATS(idev, Icmp6OutMsgs);
}
if (likely(idev != NULL))
in6_dev_put(idev);
}
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))
saddr = &skb->nh.ipv6h->saddr;
if ((probes -= neigh->parms->ucast_probes) < 0) {
if (!(neigh->nud_state&NUD_VALID))
ND_PRINTK1("trying to ucast probe in NUD_INVALID\n");
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;
int lladdrlen = 0;
u32 ndoptlen = skb->tail - msg->opt;
struct ndisc_options ndopts;
struct net_device *dev = skb->dev;
struct inet6_ifaddr *ifp;
struct neighbour *neigh;
int addr_type = ipv6_addr_type(saddr);
if (ipv6_addr_type(&msg->target)&IPV6_ADDR_MULTICAST) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NS: target address is multicast\n");
return;
}
/*
* RFC2461 7.1.1:
* DAD has to be destined for solicited node multicast address.
*/
if (addr_type == IPV6_ADDR_ANY &&
!(daddr->s6_addr32[0] == htonl(0xff020000) &&
daddr->s6_addr32[1] == htonl(0x00000000) &&
daddr->s6_addr32[2] == htonl(0x00000001) &&
daddr->s6_addr [12] == 0xff )) {
if (net_ratelimit())
printk(KERN_DEBUG "ICMP6 NS: bad DAD packet (wrong destination)\n");
return;
}
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NS: invalid ND option, ignored.\n");
return;
}
if (ndopts.nd_opts_src_lladdr) {
lladdr = (u8*)(ndopts.nd_opts_src_lladdr + 1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NS: bad lladdr length.\n");
return;
}
/* XXX: RFC2461 7.1.1:
* If the IP source address is the unspecified address,
* there MUST NOT be source link-layer address option
* in the message.
*/
if (addr_type == IPV6_ADDR_ANY) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP6 NS: bad DAD packet (link-layer address option)\n");
return;
}
}
if ((ifp = ipv6_get_ifaddr(&msg->target, dev)) != NULL) {
if (ifp->flags & IFA_F_TENTATIVE) {
/* Address is tentative. If the source
is unspecified address, it is someone
does DAD, otherwise we ignore solicitations
until DAD timer expires.
*/
if (addr_type == IPV6_ADDR_ANY) {
if (dev->type == ARPHRD_IEEE802_TR) {
unsigned char *sadr = skb->mac.raw ;
if (((sadr[8] &0x7f) != (dev->dev_addr[0] & 0x7f)) ||
(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]))
{
addrconf_dad_failure(ifp) ;
}
} else {
addrconf_dad_failure(ifp);
}
} else
in6_ifa_put(ifp);
return;
}
if (addr_type == IPV6_ADDR_ANY) {
struct in6_addr maddr;
ipv6_addr_all_nodes(&maddr);
ndisc_send_na(dev, NULL, &maddr, &ifp->addr,
ifp->idev->cnf.forwarding, 0,
1, 1);
in6_ifa_put(ifp);
return;
}
if (addr_type & IPV6_ADDR_UNICAST) {
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
if (inc)
nd_tbl.stats.rcv_probes_mcast++;
else
nd_tbl.stats.rcv_probes_ucast++;
/*
* update / create cache entry
* for the source address
*/
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, dev);
if (neigh || !dev->hard_header) {
ndisc_send_na(dev, neigh, saddr, &ifp->addr,
ifp->idev->cnf.forwarding, 1,
1, 1);
if (neigh)
neigh_release(neigh);
}
}
in6_ifa_put(ifp);
} else if (ipv6_chk_acast_addr(dev, &msg->target)) {
struct inet6_dev *idev = in6_dev_get(dev);
/* anycast */
if (!idev) {
/* XXX: count this drop? */
return;
}
if (addr_type == IPV6_ADDR_ANY) {
struct in6_addr maddr;
ipv6_addr_all_nodes(&maddr);
ndisc_send_na(dev, NULL, &maddr, &msg->target,
idev->cnf.forwarding, 0, 0, 1);
in6_dev_put(idev);
return;
}
if (addr_type & IPV6_ADDR_UNICAST) {
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
if (inc)
nd_tbl.stats.rcv_probes_mcast++;
else
nd_tbl.stats.rcv_probes_ucast++;
/*
* update / create cache entry
* for the source address
*/
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, skb->dev);
if (neigh || !dev->hard_header) {
ndisc_send_na(dev, neigh, saddr,
&msg->target,
idev->cnf.forwarding, 1, 0, inc);
if (neigh)
neigh_release(neigh);
}
}
in6_dev_put(idev);
} else {
struct inet6_dev *in6_dev = in6_dev_get(dev);
if (in6_dev && in6_dev->cnf.forwarding &&
(addr_type & IPV6_ADDR_UNICAST ||
addr_type == IPV6_ADDR_ANY) &&
pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
if (skb->stamp.tv_sec == 0 ||
skb->pkt_type == PACKET_HOST ||
inc == 0 ||
in6_dev->nd_parms->proxy_delay == 0) {
if (inc)
nd_tbl.stats.rcv_probes_mcast++;
else
nd_tbl.stats.rcv_probes_ucast++;
if (addr_type & IPV6_ADDR_UNICAST) {
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, dev);
if (neigh) {
ndisc_send_na(dev, neigh, saddr, &msg->target,
0, 1, 0, 1);
neigh_release(neigh);
}
} else {
/* proxy should also protect against DAD */
struct in6_addr maddr;
ipv6_addr_all_nodes(&maddr);
ndisc_send_na(dev, NULL, &maddr, &msg->target,
0, 0, 0, 1);
}
} else {
struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
if (n)
pneigh_enqueue(&nd_tbl, in6_dev->nd_parms, n);
in6_dev_put(in6_dev);
return;
}
}
if (in6_dev)
in6_dev_put(in6_dev);
}
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;
int lladdrlen = 0;
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)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NA: packet too short\n");
return;
}
if (ipv6_addr_type(&msg->target)&IPV6_ADDR_MULTICAST) {
if (net_ratelimit())
printk(KERN_WARNING "NDISC NA: target address is multicast\n");
return;
}
if ((ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST) &&
msg->icmph.icmp6_solicited) {
ND_PRINTK0("NDISC: solicited NA is multicasted\n");
return;
}
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NS: invalid ND option, ignored.\n");
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
if (net_ratelimit())
printk(KERN_WARNING "NDISC NA: invalid lladdr length.\n");
return;
}
}
if ((ifp = ipv6_get_ifaddr(&msg->target, dev))) {
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_PRINTK0("%s: someone advertises our address!\n",
ifp->idev->dev->name);
in6_ifa_put(ifp);
return;
}
neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
if (neigh) {
if (neigh->flags & NTF_ROUTER) {
if (msg->icmph.icmp6_router == 0) {
/*
* Change: router to host
*/
struct rt6_info *rt;
rt = rt6_get_dflt_router(saddr, dev);
if (rt)
ip6_del_rt(rt, NULL, NULL);
}
} else {
if (msg->icmph.icmp6_router)
neigh->flags |= NTF_ROUTER;
}
neigh_update(neigh, lladdr,
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
msg->icmph.icmp6_override, 1);
neigh_release(neigh);
}
}
static void ndisc_router_discovery(struct sk_buff *skb)
{
struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
struct neighbour *neigh;
struct inet6_dev *in6_dev;
struct rt6_info *rt;
int lifetime;
struct ndisc_options ndopts;
int optlen;
__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)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP RA: source address is not linklocal\n");
return;
}
if (optlen < 0) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP 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_PRINTK1("RA: can't find in6 device\n");
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);
if (net_ratelimit())
ND_PRINTK2(KERN_WARNING
"ICMP6 RA: invalid ND option, ignored.\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);
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
if (rt && lifetime == 0) {
ip6_del_rt(rt, NULL, NULL);
rt = NULL;
}
if (rt == NULL && lifetime) {
ND_PRINTK2("ndisc_rdisc: adding default router\n");
rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
if (rt == NULL) {
ND_PRINTK1("route_add failed\n");
in6_dev_put(in6_dev);
return;
}
neigh = rt->rt6i_nexthop;
if (neigh == NULL) {
ND_PRINTK1("nd: add default router: null neighbour\n");
dst_release(&rt->u.dst);
in6_dev_put(in6_dev);
return;
}
neigh->flags |= NTF_ROUTER;
/*
* If we where using an "all destinations on link" route
* delete it
*/
rt6_purge_dflt_routers(RTF_ALLONLINK);
}
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;
/*
* Update Reachable Time and Retrans Timer
*/
if (in6_dev->nd_parms) {
__u32 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;
}
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);
}
}
}
/*
* Process options.
*/
if (rt && (neigh = rt->rt6i_nexthop) != NULL) {
u8 *lladdr = NULL;
int lladdrlen;
if (ndopts.nd_opts_src_lladdr) {
lladdr = (u8*)((ndopts.nd_opts_src_lladdr)+1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
if (net_ratelimit())
ND_PRINTK2(KERN_WARNING
"ICMP6 RA: Invalid lladdr length.\n");
goto out;
}
}
neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
}
if (ndopts.nd_opts_pi) {
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) {
u32 mtu;
memcpy(&mtu, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
mtu = ntohl(mtu);
if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
if (net_ratelimit()) {
ND_PRINTK0("NDISC: router announcement with 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);
}
}
if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
if (net_ratelimit())
ND_PRINTK0(KERN_WARNING
"ICMP6 RA: got invalid option with RA");
}
out:
if (rt)
dst_release(&rt->u.dst);
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;
int lladdrlen;
if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP redirect: source address is not linklocal\n");
return;
}
optlen = skb->tail - skb->h.raw;
optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
if (optlen < 0) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP redirect: packet too small\n");
return;
}
icmph = (struct icmp6hdr *) skb->h.raw;
target = (struct in6_addr *) (icmph + 1);
dest = target + 1;
if (ipv6_addr_type(dest) & IPV6_ADDR_MULTICAST) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP redirect for multicast addr\n");
return;
}
if (ipv6_addr_cmp(dest, target) == 0) {
on_link = 1;
} else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP redirect: target address is not linklocal\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;
}
/* XXX: RFC2461 8.1:
* The IP source address of the Redirect MUST be the same as the current
* first-hop router for the specified ICMP Destination Address.
*/
if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
if (net_ratelimit())
ND_PRINTK2(KERN_WARNING
"ICMP6 Redirect: invalid ND options, rejected.\n");
in6_dev_put(in6_dev);
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
if (net_ratelimit())
ND_PRINTK2(KERN_WARNING
"ICMP6 Redirect: invalid lladdr length.\n");
in6_dev_put(in6_dev);
return;
}
}
/* passed validation tests */
/*
We install redirect only if nexthop state is valid.
*/
neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
if (neigh) {
neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
if (neigh->nud_state&NUD_VALID)
rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, on_link);
else
__neigh_event_send(neigh, NULL);
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;
dev = skb->dev;
if (ipv6_get_lladdr(dev, &saddr_buf)) {
ND_PRINTK1("redirect: no link_local addr for dev\n");
return;
}
ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr);
rt = rt6_lookup(&skb->nh.ipv6h->saddr, NULL, dev->ifindex, 1);
if (rt == NULL)
return;
dst = &rt->u.dst;
err = xfrm_lookup(&dst, &fl, NULL, 0);
if (err) {
dst_release(dst);
return;
}
rt = (struct rt6_info *) dst;
if (rt->rt6i_flags & RTF_GATEWAY) {
ND_PRINTK1("ndisc_send_redirect: not a neighbour\n");
dst_release(dst);
return;
}
if (!xrlim_allow(dst, 1*HZ)) {
dst_release(dst);
return;
}
if (dev->addr_len) {
if (neigh->nud_state&NUD_VALID) {
len += NDISC_OPT_SPACE(dev->addr_len);
} else {
/* If nexthop is not valid, do not redirect!
We will make it later, when will be sure,
that it is alive.
*/
dst_release(dst);
return;
}
}
rd_len = min_t(unsigned int,
IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
rd_len &= ~0x7;
len += rd_len;
buff = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
1, &err);
if (buff == NULL) {
ND_PRINTK1("ndisc_send_redirect: alloc_skb failed\n");
return;
}
hlen = 0;
skb_reserve(buff, (dev->hard_header_len + 15) & ~15);
ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr,
IPPROTO_ICMPV6, len);
buff->h.raw = (unsigned char*) icmph = (struct icmp6hdr *) skb_put(buff, len);
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 (dev->addr_len)
opt = ndisc_fill_option(opt, ND_OPT_TARGET_LL_ADDR, neigh->ha, dev->addr_len);
/*
* build redirect option and copy skb over to the new packet.
*/
memset(opt, 0, 8);
*(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);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output);
if (!err) {
ICMP6_INC_STATS(idev, Icmp6OutRedirects);
ICMP6_INC_STATS(idev, Icmp6OutMsgs);
}
if (likely(idev != NULL))
in6_dev_put(idev);
}
static void pndisc_redo(struct sk_buff *skb)
{
ndisc_rcv(skb);
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) {
if (net_ratelimit())
printk(KERN_WARNING
"ICMP NDISC: fake message with non-255 Hop Limit received: %d\n",
skb->nh.ipv6h->hop_limit);
return 0;
}
if (msg->icmph.icmp6_code != 0) {
if (net_ratelimit())
printk(KERN_WARNING "ICMP NDISC: code is not zero\n");
return 0;
}
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_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(0);
break;
default:
break;
}
return NOTIFY_DONE;
}
struct notifier_block ndisc_netdev_notifier = {
.notifier_call = ndisc_netdev_event,
};
int __init ndisc_init(struct net_proto_family *ops)
{
struct ipv6_pinfo *np;
struct sock *sk;
int err;
err = sock_create(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket);
if (err < 0) {
printk(KERN_ERR
"Failed to initialize the NDISC control socket (err %d).\n",
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);
/*
* Initialize the neighbour table
*/
neigh_table_init(&nd_tbl);
#ifdef CONFIG_SYSCTL
neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6");
#endif
register_netdevice_notifier(&ndisc_netdev_notifier);
return 0;
}
void ndisc_cleanup(void)
{
#ifdef CONFIG_SYSCTL
neigh_sysctl_unregister(&nd_tbl.parms);
#endif
neigh_table_clear(&nd_tbl);
sock_release(ndisc_socket);
ndisc_socket = NULL; /* For safety. */
}
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