Viewing file:  addrconf.c (45.85 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* IPv6 Address [auto]configuration
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
*
* $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 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:
*
* Janos Farkas : delete timer on ifdown
* <chexum@bankinf.banki.hu>
* Andi Kleen : kill doube kfree on module
* unload.
* Maciej W. Rozycki : FDDI support
* sekiya@USAGI : Don't send too many RS
* packets.
* yoshfuji@USAGI : Fixed interval between DAD
* packets.
*/
#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/netdevice.h>
#include <linux/if_arp.h>
#include <linux/route.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/proc_fs.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/ip.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
#include <asm/uaccess.h>
/* Set to 3 to get tracing... */
#define ACONF_DEBUG 2
#if ACONF_DEBUG >= 3
#define ADBG(x) printk x
#else
#define ADBG(x)
#endif
#ifdef CONFIG_SYSCTL
static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
#endif
int inet6_dev_count;
int inet6_ifa_count;
/*
* Configured unicast address hash table
*/
static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
static rwlock_t addrconf_hash_lock = RW_LOCK_UNLOCKED;
/* Protects inet6 devices */
rwlock_t addrconf_lock = RW_LOCK_UNLOCKED;
void addrconf_verify(unsigned long);
static struct timer_list addr_chk_timer = { function: addrconf_verify };
static int addrconf_ifdown(struct net_device *dev, int how);
static void addrconf_dad_start(struct inet6_ifaddr *ifp);
static void addrconf_dad_timer(unsigned long data);
static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
static void addrconf_rs_timer(unsigned long data);
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static struct notifier_block *inet6addr_chain;
struct ipv6_devconf ipv6_devconf =
{
0, /* forwarding */
IPV6_DEFAULT_HOPLIMIT, /* hop limit */
IPV6_MIN_MTU, /* mtu */
1, /* accept RAs */
1, /* accept redirects */
1, /* autoconfiguration */
1, /* dad transmits */
MAX_RTR_SOLICITATIONS, /* router solicits */
RTR_SOLICITATION_INTERVAL, /* rtr solicit interval */
MAX_RTR_SOLICITATION_DELAY, /* rtr solicit delay */
};
static struct ipv6_devconf ipv6_devconf_dflt =
{
0, /* forwarding */
IPV6_DEFAULT_HOPLIMIT, /* hop limit */
IPV6_MIN_MTU, /* mtu */
1, /* accept RAs */
1, /* accept redirects */
1, /* autoconfiguration */
1, /* dad transmits */
MAX_RTR_SOLICITATIONS, /* router solicits */
RTR_SOLICITATION_INTERVAL, /* rtr solicit interval */
MAX_RTR_SOLICITATION_DELAY, /* rtr solicit delay */
};
int ipv6_addr_type(struct in6_addr *addr)
{
u32 st;
st = addr->s6_addr32[0];
/* Consider all addresses with the first three bits different of
000 and 111 as unicasts.
*/
if ((st & __constant_htonl(0xE0000000)) != __constant_htonl(0x00000000) &&
(st & __constant_htonl(0xE0000000)) != __constant_htonl(0xE0000000))
return IPV6_ADDR_UNICAST;
if ((st & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000)) {
int type = IPV6_ADDR_MULTICAST;
switch((st & __constant_htonl(0x00FF0000))) {
case __constant_htonl(0x00010000):
type |= IPV6_ADDR_LOOPBACK;
break;
case __constant_htonl(0x00020000):
type |= IPV6_ADDR_LINKLOCAL;
break;
case __constant_htonl(0x00050000):
type |= IPV6_ADDR_SITELOCAL;
break;
};
return type;
}
if ((st & __constant_htonl(0xFFC00000)) == __constant_htonl(0xFE800000))
return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST);
if ((st & __constant_htonl(0xFFC00000)) == __constant_htonl(0xFEC00000))
return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST);
if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
if (addr->s6_addr32[2] == 0) {
if (addr->in6_u.u6_addr32[3] == 0)
return IPV6_ADDR_ANY;
if (addr->s6_addr32[3] == __constant_htonl(0x00000001))
return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST);
return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST);
}
if (addr->s6_addr32[2] == __constant_htonl(0x0000ffff))
return IPV6_ADDR_MAPPED;
}
return IPV6_ADDR_RESERVED;
}
static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
if (del_timer(&ifp->timer))
__in6_ifa_put(ifp);
}
enum addrconf_timer_t
{
AC_NONE,
AC_DAD,
AC_RS,
};
static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
enum addrconf_timer_t what,
unsigned long when)
{
if (!del_timer(&ifp->timer))
in6_ifa_hold(ifp);
switch (what) {
case AC_DAD:
ifp->timer.function = addrconf_dad_timer;
break;
case AC_RS:
ifp->timer.function = addrconf_rs_timer;
break;
default:;
}
ifp->timer.expires = jiffies + when;
add_timer(&ifp->timer);
}
/* Nobody refers to this device, we may destroy it. */
void in6_dev_finish_destroy(struct inet6_dev *idev)
{
struct net_device *dev = idev->dev;
BUG_TRAP(idev->addr_list==NULL);
BUG_TRAP(idev->mc_list==NULL);
#ifdef NET_REFCNT_DEBUG
printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
#endif
dev_put(dev);
if (!idev->dead) {
printk("Freeing alive inet6 device %p\n", idev);
return;
}
inet6_dev_count--;
kfree(idev);
}
static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
ASSERT_RTNL();
if (dev->mtu < IPV6_MIN_MTU)
return NULL;
ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
if (ndev) {
memset(ndev, 0, sizeof(struct inet6_dev));
ndev->lock = RW_LOCK_UNLOCKED;
ndev->dev = dev;
memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
ndev->cnf.mtu6 = dev->mtu;
ndev->cnf.sysctl = NULL;
ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
if (ndev->nd_parms == NULL) {
kfree(ndev);
return NULL;
}
inet6_dev_count++;
/* We refer to the device */
dev_hold(dev);
write_lock_bh(&addrconf_lock);
dev->ip6_ptr = ndev;
/* One reference from device */
in6_dev_hold(ndev);
write_unlock_bh(&addrconf_lock);
ipv6_mc_init_dev(ndev);
#ifdef CONFIG_SYSCTL
neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6");
addrconf_sysctl_register(ndev, &ndev->cnf);
#endif
}
return ndev;
}
static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
if ((idev = __in6_dev_get(dev)) == NULL) {
if ((idev = ipv6_add_dev(dev)) == NULL)
return NULL;
}
if (dev->flags&IFF_UP)
ipv6_mc_up(idev);
return idev;
}
static void addrconf_forward_change(struct inet6_dev *idev)
{
struct net_device *dev;
if (idev)
return;
read_lock(&dev_base_lock);
for (dev=dev_base; dev; dev=dev->next) {
read_lock(&addrconf_lock);
idev = __in6_dev_get(dev);
if (idev)
idev->cnf.forwarding = ipv6_devconf.forwarding;
read_unlock(&addrconf_lock);
}
read_unlock(&dev_base_lock);
}
/* Nobody refers to this ifaddr, destroy it */
void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
{
BUG_TRAP(ifp->if_next==NULL);
BUG_TRAP(ifp->lst_next==NULL);
#ifdef NET_REFCNT_DEBUG
printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
#endif
in6_dev_put(ifp->idev);
if (del_timer(&ifp->timer))
printk("Timer is still running, when freeing ifa=%p\n", ifp);
if (!ifp->dead) {
printk("Freeing alive inet6 address %p\n", ifp);
return;
}
inet6_ifa_count--;
kfree(ifp);
}
/* On success it returns ifp with increased reference count */
static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev *idev, struct in6_addr *addr, int pfxlen,
int scope, unsigned flags)
{
struct inet6_ifaddr *ifa;
int hash;
ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
if (ifa == NULL) {
ADBG(("ipv6_add_addr: malloc failed\n"));
return NULL;
}
memset(ifa, 0, sizeof(struct inet6_ifaddr));
ipv6_addr_copy(&ifa->addr, addr);
spin_lock_init(&ifa->lock);
init_timer(&ifa->timer);
ifa->timer.data = (unsigned long) ifa;
ifa->scope = scope;
ifa->prefix_len = pfxlen;
ifa->flags = flags | IFA_F_TENTATIVE;
read_lock(&addrconf_lock);
if (idev->dead) {
read_unlock(&addrconf_lock);
kfree(ifa);
return NULL;
}
inet6_ifa_count++;
ifa->idev = idev;
in6_dev_hold(idev);
/* For caller */
in6_ifa_hold(ifa);
/* Add to big hash table */
hash = ipv6_addr_hash(addr);
write_lock_bh(&addrconf_hash_lock);
ifa->lst_next = inet6_addr_lst[hash];
inet6_addr_lst[hash] = ifa;
in6_ifa_hold(ifa);
write_unlock_bh(&addrconf_hash_lock);
write_lock_bh(&idev->lock);
/* Add to inet6_dev unicast addr list. */
ifa->if_next = idev->addr_list;
idev->addr_list = ifa;
in6_ifa_hold(ifa);
write_unlock_bh(&idev->lock);
read_unlock(&addrconf_lock);
notifier_call_chain(&inet6addr_chain,NETDEV_UP,ifa);
return ifa;
}
/* This function wants to get referenced ifp and releases it before return */
static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
struct inet6_ifaddr *ifa, **ifap;
struct inet6_dev *idev = ifp->idev;
int hash;
hash = ipv6_addr_hash(&ifp->addr);
ifp->dead = 1;
write_lock_bh(&addrconf_hash_lock);
for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
ifap = &ifa->lst_next) {
if (ifa == ifp) {
*ifap = ifa->lst_next;
__in6_ifa_put(ifp);
ifa->lst_next = NULL;
break;
}
}
write_unlock_bh(&addrconf_hash_lock);
write_lock_bh(&idev->lock);
for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
ifap = &ifa->if_next) {
if (ifa == ifp) {
*ifap = ifa->if_next;
__in6_ifa_put(ifp);
ifa->if_next = NULL;
break;
}
}
write_unlock_bh(&idev->lock);
ipv6_ifa_notify(RTM_DELADDR, ifp);
notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
addrconf_del_timer(ifp);
in6_ifa_put(ifp);
}
/*
* Choose an apropriate source address
* should do:
* i) get an address with an apropriate scope
* ii) see if there is a specific route for the destination and use
* an address of the attached interface
* iii) don't use deprecated addresses
*/
int ipv6_get_saddr(struct dst_entry *dst,
struct in6_addr *daddr, struct in6_addr *saddr)
{
int scope;
struct inet6_ifaddr *ifp = NULL;
struct inet6_ifaddr *match = NULL;
struct net_device *dev = NULL;
struct inet6_dev *idev;
struct rt6_info *rt;
int err;
rt = (struct rt6_info *) dst;
if (rt)
dev = rt->rt6i_dev;
scope = ipv6_addr_scope(daddr);
if (rt && (rt->rt6i_flags & RTF_ALLONLINK)) {
/*
* route for the "all destinations on link" rule
* when no routers are present
*/
scope = IFA_LINK;
}
/*
* known dev
* search dev and walk through dev addresses
*/
if (dev) {
if (dev->flags & IFF_LOOPBACK)
scope = IFA_HOST;
read_lock(&addrconf_lock);
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == scope) {
if (!(ifp->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE))) {
in6_ifa_hold(ifp);
read_unlock_bh(&idev->lock);
read_unlock(&addrconf_lock);
goto out;
}
if (!match && !(ifp->flags & IFA_F_TENTATIVE)) {
match = ifp;
in6_ifa_hold(ifp);
}
}
}
read_unlock_bh(&idev->lock);
}
read_unlock(&addrconf_lock);
}
if (scope == IFA_LINK)
goto out;
/*
* dev == NULL or search failed for specified dev
*/
read_lock(&dev_base_lock);
read_lock(&addrconf_lock);
for (dev = dev_base; dev; dev=dev->next) {
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == scope) {
if (!(ifp->flags&(IFA_F_DEPRECATED|IFA_F_TENTATIVE))) {
in6_ifa_hold(ifp);
read_unlock_bh(&idev->lock);
goto out_unlock_base;
}
if (!match && !(ifp->flags&IFA_F_TENTATIVE)) {
match = ifp;
in6_ifa_hold(ifp);
}
}
}
read_unlock_bh(&idev->lock);
}
}
out_unlock_base:
read_unlock(&addrconf_lock);
read_unlock(&dev_base_lock);
out:
if (ifp == NULL) {
ifp = match;
match = NULL;
}
err = -EADDRNOTAVAIL;
if (ifp) {
ipv6_addr_copy(saddr, &ifp->addr);
err = 0;
in6_ifa_put(ifp);
}
if (match)
in6_ifa_put(match);
return err;
}
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
{
struct inet6_dev *idev;
int err = -EADDRNOTAVAIL;
read_lock(&addrconf_lock);
if ((idev = __in6_dev_get(dev)) != NULL) {
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
ipv6_addr_copy(addr, &ifp->addr);
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
}
read_unlock(&addrconf_lock);
return err;
}
int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev)
{
struct inet6_ifaddr * ifp;
u8 hash = ipv6_addr_hash(addr);
read_lock_bh(&addrconf_hash_lock);
for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
!(ifp->flags&IFA_F_TENTATIVE)) {
if (dev == NULL || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST)))
break;
}
}
read_unlock_bh(&addrconf_hash_lock);
return ifp != NULL;
}
struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev)
{
struct inet6_ifaddr * ifp;
u8 hash = ipv6_addr_hash(addr);
read_lock_bh(&addrconf_hash_lock);
for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
if (ipv6_addr_cmp(&ifp->addr, addr) == 0) {
if (dev == NULL || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST))) {
in6_ifa_hold(ifp);
break;
}
}
}
read_unlock_bh(&addrconf_hash_lock);
return ifp;
}
/* Gets referenced address, destroys ifaddr */
void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
if (net_ratelimit())
printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
if (ifp->flags&IFA_F_PERMANENT) {
spin_lock_bh(&ifp->lock);
addrconf_del_timer(ifp);
ifp->flags |= IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
in6_ifa_put(ifp);
} else
ipv6_del_addr(ifp);
}
/* Join to solicited addr multicast group. */
static void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
{
struct in6_addr maddr;
if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
return;
addrconf_addr_solict_mult(addr, &maddr);
ipv6_dev_mc_inc(dev, &maddr);
}
static void addrconf_leave_solict(struct net_device *dev, struct in6_addr *addr)
{
struct in6_addr maddr;
if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
return;
addrconf_addr_solict_mult(addr, &maddr);
ipv6_dev_mc_dec(dev, &maddr);
}
static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
{
switch (dev->type) {
case ARPHRD_ETHER:
case ARPHRD_FDDI:
case ARPHRD_IEEE802_TR:
if (dev->addr_len != ETH_ALEN)
return -1;
memcpy(eui, dev->dev_addr, 3);
memcpy(eui + 5, dev->dev_addr+3, 3);
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[0] ^= 2;
return 0;
}
return -1;
}
static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
{
int err = -1;
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
memcpy(eui, ifp->addr.s6_addr+8, 8);
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
return err;
}
/*
* Add prefix route.
*/
static void
addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
unsigned long expires, unsigned flags)
{
struct in6_rtmsg rtmsg;
memset(&rtmsg, 0, sizeof(rtmsg));
memcpy(&rtmsg.rtmsg_dst, pfx, sizeof(struct in6_addr));
rtmsg.rtmsg_dst_len = plen;
rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
rtmsg.rtmsg_ifindex = dev->ifindex;
rtmsg.rtmsg_info = expires;
rtmsg.rtmsg_flags = RTF_UP|flags;
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
/* Prevent useless cloning on PtP SIT.
This thing is done here expecting that the whole
class of non-broadcast devices need not cloning.
*/
if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
ip6_route_add(&rtmsg);
}
/* Create "default" multicast route to the interface */
static void addrconf_add_mroute(struct net_device *dev)
{
struct in6_rtmsg rtmsg;
memset(&rtmsg, 0, sizeof(rtmsg));
ipv6_addr_set(&rtmsg.rtmsg_dst,
__constant_htonl(0xFF000000), 0, 0, 0);
rtmsg.rtmsg_dst_len = 8;
rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
rtmsg.rtmsg_ifindex = dev->ifindex;
rtmsg.rtmsg_flags = RTF_UP|RTF_ADDRCONF;
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
ip6_route_add(&rtmsg);
}
static void sit_route_add(struct net_device *dev)
{
struct in6_rtmsg rtmsg;
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
/* prefix length - 96 bytes "::d.d.d.d" */
rtmsg.rtmsg_dst_len = 96;
rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
rtmsg.rtmsg_ifindex = dev->ifindex;
ip6_route_add(&rtmsg);
}
static void addrconf_add_lroute(struct net_device *dev)
{
struct in6_addr addr;
ipv6_addr_set(&addr, __constant_htonl(0xFE800000), 0, 0, 0);
addrconf_prefix_route(&addr, 10, dev, 0, RTF_ADDRCONF);
}
static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
if ((idev = ipv6_find_idev(dev)) == NULL)
return NULL;
/* Add default multicast route */
addrconf_add_mroute(dev);
/* Add link local route */
addrconf_add_lroute(dev);
return idev;
}
void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
{
struct prefix_info *pinfo;
struct rt6_info *rt;
__u32 valid_lft;
__u32 prefered_lft;
int addr_type;
unsigned long rt_expires;
struct inet6_dev *in6_dev;
pinfo = (struct prefix_info *) opt;
if (len < sizeof(struct prefix_info)) {
ADBG(("addrconf: prefix option too short\n"));
return;
}
/*
* Validation checks ([ADDRCONF], page 19)
*/
addr_type = ipv6_addr_type(&pinfo->prefix);
if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
return;
valid_lft = ntohl(pinfo->valid);
prefered_lft = ntohl(pinfo->prefered);
if (prefered_lft > valid_lft) {
if (net_ratelimit())
printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
return;
}
in6_dev = in6_dev_get(dev);
if (in6_dev == NULL) {
if (net_ratelimit())
printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
return;
}
/*
* Two things going on here:
* 1) Add routes for on-link prefixes
* 2) Configure prefixes with the auto flag set
*/
/* Avoid arithemtic overflow. Really, we could
save rt_expires in seconds, likely valid_lft,
but it would require division in fib gc, that it
not good.
*/
if (valid_lft >= 0x7FFFFFFF/HZ)
rt_expires = 0;
else
rt_expires = jiffies + valid_lft * HZ;
rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
if (rt->rt6i_flags&RTF_EXPIRES) {
if (pinfo->onlink == 0 || valid_lft == 0) {
ip6_del_rt(rt);
rt = NULL;
} else {
rt->rt6i_expires = rt_expires;
}
}
} else if (pinfo->onlink && valid_lft) {
addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES);
}
if (rt)
dst_release(&rt->u.dst);
/* Try to figure out our local address for this prefix */
if (pinfo->autoconf && in6_dev->cnf.autoconf) {
struct inet6_ifaddr * ifp;
struct in6_addr addr;
int plen;
plen = pinfo->prefix_len >> 3;
if (pinfo->prefix_len == 64) {
memcpy(&addr, &pinfo->prefix, 8);
if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
in6_dev_put(in6_dev);
return;
}
goto ok;
}
if (net_ratelimit())
printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
pinfo->prefix_len);
in6_dev_put(in6_dev);
return;
ok:
ifp = ipv6_get_ifaddr(&addr, dev);
if (ifp == NULL && valid_lft) {
ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
addr_type&IPV6_ADDR_SCOPE_MASK, 0);
if (ifp == NULL) {
in6_dev_put(in6_dev);
return;
}
addrconf_dad_start(ifp);
}
if (ifp && valid_lft == 0) {
ipv6_del_addr(ifp);
ifp = NULL;
}
if (ifp) {
int flags;
spin_lock(&ifp->lock);
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
ifp->tstamp = jiffies;
flags = ifp->flags;
ifp->flags &= ~IFA_F_DEPRECATED;
spin_unlock(&ifp->lock);
if (!(flags&IFA_F_TENTATIVE))
ipv6_ifa_notify((flags&IFA_F_DEPRECATED) ?
0 : RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
}
in6_dev_put(in6_dev);
}
/*
* Set destination address.
* Special case for SIT interfaces where we create a new "virtual"
* device.
*/
int addrconf_set_dstaddr(void *arg)
{
struct in6_ifreq ireq;
struct net_device *dev;
int err = -EINVAL;
rtnl_lock();
err = -EFAULT;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
goto err_exit;
dev = __dev_get_by_index(ireq.ifr6_ifindex);
err = -ENODEV;
if (dev == NULL)
goto err_exit;
if (dev->type == ARPHRD_SIT) {
struct ifreq ifr;
mm_segment_t oldfs;
struct ip_tunnel_parm p;
err = -EADDRNOTAVAIL;
if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
goto err_exit;
memset(&p, 0, sizeof(p));
p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
p.iph.saddr = 0;
p.iph.version = 4;
p.iph.ihl = 5;
p.iph.protocol = IPPROTO_IPV6;
p.iph.ttl = 64;
ifr.ifr_ifru.ifru_data = (void*)&p;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
set_fs(oldfs);
if (err == 0) {
err = -ENOBUFS;
if ((dev = __dev_get_by_name(p.name)) == NULL)
goto err_exit;
err = dev_open(dev);
}
}
err_exit:
rtnl_unlock();
return err;
}
/*
* Manual configuration of address on an interface
*/
static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
int scope;
ASSERT_RTNL();
if ((dev = __dev_get_by_index(ifindex)) == NULL)
return -ENODEV;
if (!(dev->flags&IFF_UP))
return -ENETDOWN;
if ((idev = addrconf_add_dev(dev)) == NULL)
return -ENOBUFS;
scope = ipv6_addr_scope(pfx);
if ((ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT)) != NULL) {
addrconf_dad_start(ifp);
in6_ifa_put(ifp);
return 0;
}
return -ENOBUFS;
}
static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
if ((dev = __dev_get_by_index(ifindex)) == NULL)
return -ENODEV;
if ((idev = __in6_dev_get(dev)) == NULL)
return -ENXIO;
read_lock_bh(&idev->lock);
for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->prefix_len == plen &&
(!memcmp(pfx, &ifp->addr, sizeof(struct in6_addr)))) {
in6_ifa_hold(ifp);
read_unlock_bh(&idev->lock);
ipv6_del_addr(ifp);
/* If the last address is deleted administratively,
disable IPv6 on this interface.
*/
if (idev->addr_list == NULL)
addrconf_ifdown(idev->dev, 1);
return 0;
}
}
read_unlock_bh(&idev->lock);
return -EADDRNOTAVAIL;
}
int addrconf_add_ifaddr(void *arg)
{
struct in6_ifreq ireq;
int err;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
rtnl_lock();
err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
rtnl_unlock();
return err;
}
int addrconf_del_ifaddr(void *arg)
{
struct in6_ifreq ireq;
int err;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
rtnl_lock();
err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
rtnl_unlock();
return err;
}
static void sit_add_v4_addrs(struct inet6_dev *idev)
{
struct inet6_ifaddr * ifp;
struct in6_addr addr;
struct net_device *dev;
int scope;
ASSERT_RTNL();
memset(&addr, 0, sizeof(struct in6_addr));
memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
if (idev->dev->flags&IFF_POINTOPOINT) {
addr.s6_addr32[0] = __constant_htonl(0xfe800000);
scope = IFA_LINK;
} else {
scope = IPV6_ADDR_COMPATv4;
}
if (addr.s6_addr32[3]) {
ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
if (ifp) {
spin_lock_bh(&ifp->lock);
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
ipv6_ifa_notify(RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
return;
}
for (dev = dev_base; dev != NULL; dev = dev->next) {
struct in_device * in_dev = __in_dev_get(dev);
if (in_dev && (dev->flags & IFF_UP)) {
struct in_ifaddr * ifa;
int flag = scope;
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
int plen;
addr.s6_addr32[3] = ifa->ifa_local;
if (ifa->ifa_scope == RT_SCOPE_LINK)
continue;
if (ifa->ifa_scope >= RT_SCOPE_HOST) {
if (idev->dev->flags&IFF_POINTOPOINT)
continue;
flag |= IFA_HOST;
}
if (idev->dev->flags&IFF_POINTOPOINT)
plen = 10;
else
plen = 96;
ifp = ipv6_add_addr(idev, &addr, plen, flag,
IFA_F_PERMANENT);
if (ifp) {
spin_lock_bh(&ifp->lock);
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
ipv6_ifa_notify(RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
}
}
}
}
static void init_loopback(struct net_device *dev)
{
struct in6_addr addr;
struct inet6_dev *idev;
struct inet6_ifaddr * ifp;
/* ::1 */
ASSERT_RTNL();
memset(&addr, 0, sizeof(struct in6_addr));
addr.s6_addr[15] = 1;
if ((idev = ipv6_find_idev(dev)) == NULL) {
printk(KERN_DEBUG "init loopback: add_dev failed\n");
return;
}
ifp = ipv6_add_addr(idev, &addr, 128, IFA_HOST, IFA_F_PERMANENT);
if (ifp) {
spin_lock_bh(&ifp->lock);
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
ipv6_ifa_notify(RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
}
static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
{
struct inet6_ifaddr * ifp;
ifp = ipv6_add_addr(idev, addr, 10, IFA_LINK, IFA_F_PERMANENT);
if (ifp) {
addrconf_dad_start(ifp);
in6_ifa_put(ifp);
}
}
static void addrconf_dev_config(struct net_device *dev)
{
struct in6_addr addr;
struct inet6_dev * idev;
ASSERT_RTNL();
if ((dev->type != ARPHRD_ETHER) &&
(dev->type != ARPHRD_FDDI) &&
(dev->type != ARPHRD_IEEE802_TR)) {
/* Alas, we support only Ethernet autoconfiguration. */
return;
}
idev = addrconf_add_dev(dev);
if (idev == NULL)
return;
memset(&addr, 0, sizeof(struct in6_addr));
addr.s6_addr[0] = 0xFE;
addr.s6_addr[1] = 0x80;
if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
addrconf_add_linklocal(idev, &addr);
}
static void addrconf_sit_config(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
/*
* Configure the tunnel with one of our IPv4
* addresses... we should configure all of
* our v4 addrs in the tunnel
*/
if ((idev = ipv6_find_idev(dev)) == NULL) {
printk(KERN_DEBUG "init sit: add_dev failed\n");
return;
}
sit_add_v4_addrs(idev);
if (dev->flags&IFF_POINTOPOINT) {
addrconf_add_mroute(dev);
addrconf_add_lroute(dev);
} else
sit_route_add(dev);
}
int addrconf_notify(struct notifier_block *this, unsigned long event,
void * data)
{
struct net_device *dev;
dev = (struct net_device *) data;
switch(event) {
case NETDEV_UP:
switch(dev->type) {
case ARPHRD_SIT:
addrconf_sit_config(dev);
break;
case ARPHRD_LOOPBACK:
init_loopback(dev);
break;
default:
addrconf_dev_config(dev);
break;
};
break;
case NETDEV_CHANGEMTU:
if (dev->mtu >= IPV6_MIN_MTU) {
struct inet6_dev *idev;
if ((idev = __in6_dev_get(dev)) == NULL)
break;
idev->cnf.mtu6 = dev->mtu;
rt6_mtu_change(dev, dev->mtu);
break;
}
/* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
/*
* Remove all addresses from this interface.
*/
addrconf_ifdown(dev, event != NETDEV_DOWN);
break;
case NETDEV_CHANGE:
break;
};
return NOTIFY_OK;
}
static int addrconf_ifdown(struct net_device *dev, int how)
{
struct inet6_dev *idev;
struct inet6_ifaddr *ifa, **bifa;
int i;
ASSERT_RTNL();
rt6_ifdown(dev);
neigh_ifdown(&nd_tbl, dev);
idev = __in6_dev_get(dev);
if (idev == NULL)
return -ENODEV;
/* Step 1: remove reference to ipv6 device from parent device.
Do not dev_put!
*/
if (how == 1) {
write_lock_bh(&addrconf_lock);
dev->ip6_ptr = NULL;
idev->dead = 1;
write_unlock_bh(&addrconf_lock);
}
/* Step 2: clear hash table */
for (i=0; i<IN6_ADDR_HSIZE; i++) {
bifa = &inet6_addr_lst[i];
write_lock_bh(&addrconf_hash_lock);
while ((ifa = *bifa) != NULL) {
if (ifa->idev == idev) {
*bifa = ifa->lst_next;
ifa->lst_next = NULL;
addrconf_del_timer(ifa);
in6_ifa_put(ifa);
continue;
}
bifa = &ifa->lst_next;
}
write_unlock_bh(&addrconf_hash_lock);
}
/* Step 3: clear address list */
write_lock_bh(&idev->lock);
while ((ifa = idev->addr_list) != NULL) {
idev->addr_list = ifa->if_next;
ifa->if_next = NULL;
ifa->dead = 1;
addrconf_del_timer(ifa);
write_unlock_bh(&idev->lock);
ipv6_ifa_notify(RTM_DELADDR, ifa);
in6_ifa_put(ifa);
write_lock_bh(&idev->lock);
}
write_unlock_bh(&idev->lock);
/* Step 4: Discard multicast list */
if (how == 1)
ipv6_mc_destroy_dev(idev);
else
ipv6_mc_down(idev);
/* Shot the device (if unregistered) */
if (how == 1) {
neigh_parms_release(&nd_tbl, idev->nd_parms);
#ifdef CONFIG_SYSCTL
addrconf_sysctl_unregister(&idev->cnf);
#endif
in6_dev_put(idev);
}
return 0;
}
static void addrconf_rs_timer(unsigned long data)
{
struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
if (ifp->idev->cnf.forwarding)
goto out;
if (ifp->idev->if_flags & IF_RA_RCVD) {
/*
* Announcement received after solicitation
* was sent
*/
goto out;
}
spin_lock(&ifp->lock);
if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
struct in6_addr all_routers;
/* The wait after the last probe can be shorter */
addrconf_mod_timer(ifp, AC_RS,
(ifp->probes == ifp->idev->cnf.rtr_solicits) ?
ifp->idev->cnf.rtr_solicit_delay :
ifp->idev->cnf.rtr_solicit_interval);
spin_unlock(&ifp->lock);
ipv6_addr_all_routers(&all_routers);
ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
} else {
struct in6_rtmsg rtmsg;
spin_unlock(&ifp->lock);
printk(KERN_DEBUG "%s: no IPv6 routers present\n",
ifp->idev->dev->name);
memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
rtmsg.rtmsg_flags = (RTF_ALLONLINK | RTF_ADDRCONF |
RTF_DEFAULT | RTF_UP);
rtmsg.rtmsg_ifindex = ifp->idev->dev->ifindex;
ip6_route_add(&rtmsg);
}
out:
in6_ifa_put(ifp);
}
/*
* Duplicate Address Detection
*/
static void addrconf_dad_start(struct inet6_ifaddr *ifp)
{
struct net_device *dev;
unsigned long rand_num;
dev = ifp->idev->dev;
addrconf_join_solict(dev, &ifp->addr);
if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, RTF_ADDRCONF);
net_srandom(ifp->addr.s6_addr32[3]);
rand_num = net_random() % (ifp->idev->cnf.rtr_solicit_delay ? : 1);
spin_lock_bh(&ifp->lock);
if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
!(ifp->flags&IFA_F_TENTATIVE)) {
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
addrconf_dad_completed(ifp);
return;
}
ifp->probes = ifp->idev->cnf.dad_transmits;
addrconf_mod_timer(ifp, AC_DAD, rand_num);
spin_unlock_bh(&ifp->lock);
}
static void addrconf_dad_timer(unsigned long data)
{
struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
struct in6_addr unspec;
struct in6_addr mcaddr;
spin_lock_bh(&ifp->lock);
if (ifp->probes == 0) {
/*
* DAD was successful
*/
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
addrconf_dad_completed(ifp);
in6_ifa_put(ifp);
return;
}
ifp->probes--;
addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
spin_unlock_bh(&ifp->lock);
/* send a neighbour solicitation for our addr */
memset(&unspec, 0, sizeof(unspec));
addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
in6_ifa_put(ifp);
}
static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
{
struct net_device * dev = ifp->idev->dev;
/*
* Configure the address for reception. Now it is valid.
*/
ipv6_ifa_notify(RTM_NEWADDR, ifp);
/* If added prefix is link local and forwarding is off,
start sending router solicitations.
*/
if (ifp->idev->cnf.forwarding == 0 &&
(dev->flags&IFF_LOOPBACK) == 0 &&
(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
struct in6_addr all_routers;
ipv6_addr_all_routers(&all_routers);
/*
* If a host as already performed a random delay
* [...] as part of DAD [...] there is no need
* to delay again before sending the first RS
*/
ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
spin_lock_bh(&ifp->lock);
ifp->probes = 1;
ifp->idev->if_flags |= IF_RS_SENT;
addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
spin_unlock_bh(&ifp->lock);
}
}
#ifdef CONFIG_PROC_FS
static int iface_proc_info(char *buffer, char **start, off_t offset,
int length)
{
struct inet6_ifaddr *ifp;
int i;
int len = 0;
off_t pos=0;
off_t begin=0;
for (i=0; i < IN6_ADDR_HSIZE; i++) {
read_lock_bh(&addrconf_hash_lock);
for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
int j;
for (j=0; j<16; j++) {
sprintf(buffer + len, "%02x",
ifp->addr.s6_addr[j]);
len += 2;
}
len += sprintf(buffer + len,
" %02x %02x %02x %02x %8s\n",
ifp->idev->dev->ifindex,
ifp->prefix_len,
ifp->scope,
ifp->flags,
ifp->idev->dev->name);
pos=begin+len;
if(pos<offset) {
len=0;
begin=pos;
}
if(pos>offset+length) {
read_unlock_bh(&addrconf_hash_lock);
goto done;
}
}
read_unlock_bh(&addrconf_hash_lock);
}
done:
*start=buffer+(offset-begin);
len-=(offset-begin);
if(len>length)
len=length;
if(len<0)
len=0;
return len;
}
#endif /* CONFIG_PROC_FS */
/*
* Periodic address status verification
*/
void addrconf_verify(unsigned long foo)
{
struct inet6_ifaddr *ifp;
unsigned long now = jiffies;
int i;
for (i=0; i < IN6_ADDR_HSIZE; i++) {
restart:
write_lock(&addrconf_hash_lock);
for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
unsigned long age;
if (ifp->flags & IFA_F_PERMANENT)
continue;
age = (now - ifp->tstamp) / HZ;
if (age > ifp->valid_lft) {
in6_ifa_hold(ifp);
write_unlock(&addrconf_hash_lock);
ipv6_del_addr(ifp);
goto restart;
} else if (age > ifp->prefered_lft) {
int deprecate = 0;
spin_lock(&ifp->lock);
if (!(ifp->flags&IFA_F_DEPRECATED)) {
deprecate = 1;
ifp->flags |= IFA_F_DEPRECATED;
}
spin_unlock(&ifp->lock);
if (deprecate) {
in6_ifa_hold(ifp);
write_unlock(&addrconf_hash_lock);
ipv6_ifa_notify(0, ifp);
in6_ifa_put(ifp);
goto restart;
}
}
}
write_unlock(&addrconf_hash_lock);
}
mod_timer(&addr_chk_timer, jiffies + ADDR_CHECK_FREQUENCY);
}
static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct rtattr **rta = arg;
struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
struct in6_addr *pfx;
pfx = NULL;
if (rta[IFA_ADDRESS-1]) {
if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
return -EINVAL;
pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
}
if (rta[IFA_LOCAL-1]) {
if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
return -EINVAL;
pfx = RTA_DATA(rta[IFA_LOCAL-1]);
}
if (pfx == NULL)
return -EINVAL;
return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
}
static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct rtattr **rta = arg;
struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
struct in6_addr *pfx;
pfx = NULL;
if (rta[IFA_ADDRESS-1]) {
if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
return -EINVAL;
pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
}
if (rta[IFA_LOCAL-1]) {
if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
return -EINVAL;
pfx = RTA_DATA(rta[IFA_LOCAL-1]);
}
if (pfx == NULL)
return -EINVAL;
return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
}
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
u32 pid, u32 seq, int event)
{
struct ifaddrmsg *ifm;
struct nlmsghdr *nlh;
struct ifa_cacheinfo ci;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
ifm = NLMSG_DATA(nlh);
ifm->ifa_family = AF_INET6;
ifm->ifa_prefixlen = ifa->prefix_len;
ifm->ifa_flags = ifa->flags;
ifm->ifa_scope = RT_SCOPE_UNIVERSE;
if (ifa->scope&IFA_HOST)
ifm->ifa_scope = RT_SCOPE_HOST;
else if (ifa->scope&IFA_LINK)
ifm->ifa_scope = RT_SCOPE_LINK;
else if (ifa->scope&IFA_SITE)
ifm->ifa_scope = RT_SCOPE_SITE;
ifm->ifa_index = ifa->idev->dev->ifindex;
RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
if (!(ifa->flags&IFA_F_PERMANENT)) {
ci.ifa_prefered = ifa->prefered_lft;
ci.ifa_valid = ifa->valid_lft;
if (ci.ifa_prefered != 0xFFFFFFFF) {
long tval = (jiffies - ifa->tstamp)/HZ;
ci.ifa_prefered -= tval;
if (ci.ifa_valid != 0xFFFFFFFF)
ci.ifa_valid -= tval;
}
RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
}
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
rtattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx, ip_idx;
int s_idx, s_ip_idx;
struct inet6_ifaddr *ifa;
s_idx = cb->args[0];
s_ip_idx = ip_idx = cb->args[1];
for (idx=0; idx < IN6_ADDR_HSIZE; idx++) {
if (idx < s_idx)
continue;
if (idx > s_idx)
s_ip_idx = 0;
read_lock_bh(&addrconf_hash_lock);
for (ifa=inet6_addr_lst[idx], ip_idx = 0; ifa;
ifa = ifa->lst_next, ip_idx++) {
if (ip_idx < s_ip_idx)
continue;
if (inet6_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWADDR) <= 0) {
read_unlock_bh(&addrconf_hash_lock);
goto done;
}
}
read_unlock_bh(&addrconf_hash_lock);
}
done:
cb->args[0] = idx;
cb->args[1] = ip_idx;
return skb->len;
}
static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
{
struct sk_buff *skb;
int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb) {
netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
return;
}
if (inet6_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
kfree_skb(skb);
netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
return;
}
NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
}
static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
{
{ NULL, NULL, },
{ NULL, NULL, },
{ NULL, NULL, },
{ NULL, NULL, },
{ inet6_rtm_newaddr, NULL, },
{ inet6_rtm_deladdr, NULL, },
{ NULL, inet6_dump_ifaddr, },
{ NULL, NULL, },
{ inet6_rtm_newroute, NULL, },
{ inet6_rtm_delroute, NULL, },
{ inet6_rtm_getroute, inet6_dump_fib, },
{ NULL, NULL, },
};
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
switch (event) {
case RTM_NEWADDR:
ip6_rt_addr_add(&ifp->addr, ifp->idev->dev);
break;
case RTM_DELADDR:
addrconf_leave_solict(ifp->idev->dev, &ifp->addr);
if (!ipv6_chk_addr(&ifp->addr, ifp->idev->dev))
ip6_rt_addr_del(&ifp->addr, ifp->idev->dev);
break;
}
}
#ifdef CONFIG_SYSCTL
static
int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
void *buffer, size_t *lenp)
{
int *valp = ctl->data;
int val = *valp;
int ret;
ret = proc_dointvec(ctl, write, filp, buffer, lenp);
if (write && *valp != val && valp != &ipv6_devconf_dflt.forwarding) {
struct inet6_dev *idev = NULL;
if (valp != &ipv6_devconf.forwarding) {
struct net_device *dev = dev_get_by_index(ctl->ctl_name);
if (dev) {
idev = in6_dev_get(dev);
dev_put(dev);
}
if (idev == NULL)
return ret;
} else
ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
addrconf_forward_change(idev);
if (*valp)
rt6_purge_dflt_routers(0);
if (idev)
in6_dev_put(idev);
}
return ret;
}
static struct addrconf_sysctl_table
{
struct ctl_table_header *sysctl_header;
ctl_table addrconf_vars[11];
ctl_table addrconf_dev[2];
ctl_table addrconf_conf_dir[2];
ctl_table addrconf_proto_dir[2];
ctl_table addrconf_root_dir[2];
} addrconf_sysctl = {
NULL,
{{NET_IPV6_FORWARDING, "forwarding",
&ipv6_devconf.forwarding, sizeof(int), 0644, NULL,
&addrconf_sysctl_forward},
{NET_IPV6_HOP_LIMIT, "hop_limit",
&ipv6_devconf.hop_limit, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_MTU, "mtu",
&ipv6_devconf.mtu6, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_ACCEPT_RA, "accept_ra",
&ipv6_devconf.accept_ra, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_ACCEPT_REDIRECTS, "accept_redirects",
&ipv6_devconf.accept_redirects, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_AUTOCONF, "autoconf",
&ipv6_devconf.autoconf, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_DAD_TRANSMITS, "dad_transmits",
&ipv6_devconf.dad_transmits, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_RTR_SOLICITS, "router_solicitations",
&ipv6_devconf.rtr_solicits, sizeof(int), 0644, NULL,
&proc_dointvec},
{NET_IPV6_RTR_SOLICIT_INTERVAL, "router_solicitation_interval",
&ipv6_devconf.rtr_solicit_interval, sizeof(int), 0644, NULL,
&proc_dointvec_jiffies},
{NET_IPV6_RTR_SOLICIT_DELAY, "router_solicitation_delay",
&ipv6_devconf.rtr_solicit_delay, sizeof(int), 0644, NULL,
&proc_dointvec_jiffies},
{0}},
{{NET_PROTO_CONF_ALL, "all", NULL, 0, 0555, addrconf_sysctl.addrconf_vars},{0}},
{{NET_IPV6_CONF, "conf", NULL, 0, 0555, addrconf_sysctl.addrconf_dev},{0}},
{{NET_IPV6, "ipv6", NULL, 0, 0555, addrconf_sysctl.addrconf_conf_dir},{0}},
{{CTL_NET, "net", NULL, 0, 0555, addrconf_sysctl.addrconf_proto_dir},{0}}
};
static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
{
int i;
struct net_device *dev = idev ? idev->dev : NULL;
struct addrconf_sysctl_table *t;
t = kmalloc(sizeof(*t), GFP_KERNEL);
if (t == NULL)
return;
memcpy(t, &addrconf_sysctl, sizeof(*t));
for (i=0; i<sizeof(t->addrconf_vars)/sizeof(t->addrconf_vars[0])-1; i++) {
t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
t->addrconf_vars[i].de = NULL;
}
if (dev) {
t->addrconf_dev[0].procname = dev->name;
t->addrconf_dev[0].ctl_name = dev->ifindex;
} else {
t->addrconf_dev[0].procname = "default";
t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
}
t->addrconf_dev[0].child = t->addrconf_vars;
t->addrconf_dev[0].de = NULL;
t->addrconf_conf_dir[0].child = t->addrconf_dev;
t->addrconf_conf_dir[0].de = NULL;
t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
t->addrconf_proto_dir[0].de = NULL;
t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
t->addrconf_root_dir[0].de = NULL;
t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
if (t->sysctl_header == NULL)
kfree(t);
else
p->sysctl = t;
}
static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
if (p->sysctl) {
struct addrconf_sysctl_table *t = p->sysctl;
p->sysctl = NULL;
unregister_sysctl_table(t->sysctl_header);
kfree(t);
}
}
#endif
/*
* Device notifier
*/
int register_inet6addr_notifier(struct notifier_block *nb)
{
return notifier_chain_register(&inet6addr_chain, nb);
}
int unregister_inet6addr_notifier(struct notifier_block *nb)
{
return notifier_chain_unregister(&inet6addr_chain,nb);
}
/*
* Init / cleanup code
*/
void __init addrconf_init(void)
{
#ifdef MODULE
struct net_device *dev;
/* This takes sense only during module load. */
rtnl_lock();
for (dev = dev_base; dev; dev = dev->next) {
if (!(dev->flags&IFF_UP))
continue;
switch (dev->type) {
case ARPHRD_LOOPBACK:
init_loopback(dev);
break;
case ARPHRD_ETHER:
case ARPHRD_FDDI:
case ARPHRD_IEEE802_TR:
addrconf_dev_config(dev);
break;
default:;
/* Ignore all other */
}
}
rtnl_unlock();
#endif
#ifdef CONFIG_PROC_FS
proc_net_create("if_inet6", 0, iface_proc_info);
#endif
addr_chk_timer.expires = jiffies + ADDR_CHECK_FREQUENCY;
add_timer(&addr_chk_timer);
rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
#ifdef CONFIG_SYSCTL
addrconf_sysctl.sysctl_header =
register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
#endif
}
#ifdef MODULE
void addrconf_cleanup(void)
{
struct net_device *dev;
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
int i;
rtnetlink_links[PF_INET6] = NULL;
#ifdef CONFIG_SYSCTL
addrconf_sysctl_unregister(&ipv6_devconf_dflt);
addrconf_sysctl_unregister(&ipv6_devconf);
#endif
rtnl_lock();
/*
* clean dev list.
*/
for (dev=dev_base; dev; dev=dev->next) {
if ((idev = __in6_dev_get(dev)) == NULL)
continue;
addrconf_ifdown(dev, 1);
}
/*
* Check hash table.
*/
write_lock_bh(&addrconf_hash_lock);
for (i=0; i < IN6_ADDR_HSIZE; i++) {
for (ifa=inet6_addr_lst[i]; ifa; ) {
struct inet6_ifaddr *bifa;
bifa = ifa;
ifa = ifa->lst_next;
printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
/* Do not free it; something is wrong.
Now we can investigate it with debugger.
*/
}
}
write_unlock_bh(&addrconf_hash_lock);
del_timer(&addr_chk_timer);
rtnl_unlock();
#ifdef CONFIG_PROC_FS
proc_net_remove("if_inet6");
#endif
}
#endif /* MODULE */
|