/*
* 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 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 int ip6_dst_lookup_tail(struct sock *sk,
struct dst_entry **dst, struct flowi *fl)
{
int err;
if (*dst == NULL)
*dst = ip6_route_output(sk, fl);
if ((err = (*dst)->error))
goto out_err_release;
if (ipv6_addr_any(&fl->fl6_src)) {
err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src);
if (err)
goto out_err_release;
}
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
/*
* Here if the dst entry we've looked up
* has a neighbour entry that is in the INCOMPLETE
* state and the src address from the flow is
* marked as OPTIMISTIC, we release the found
* dst entry and replace it instead with the
* dst entry of the nexthop router
*/
if (!((*dst)->neighbour->nud_state & NUD_VALID)) {
struct inet6_ifaddr *ifp;
struct flowi fl_gw;
int redirect;
ifp = ipv6_get_ifaddr(&fl->fl6_src, (*dst)->dev, 1);
redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
if (ifp)
in6_ifa_put(ifp);
if (redirect) {
/*
* We need to get the dst entry for the
* default router instead
*/
dst_release(*dst);
memcpy(&fl_gw, fl, sizeof(struct flowi));
memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr));
*dst = ip6_route_output(sk, &fl_gw);
if ((err = (*dst)->error))
goto out_err_release;
}
}
#endif
return 0;
out_err_release:
dst_release(*dst);
*dst = NULL;
return err;
}
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);
}
}
/**
* mipv6_mn_get_bulifetime - Get lifetime for a binding update
* @home_addr: home address for BU
* @coa: care-of address for BU
* @flags: flags used for BU
*
* Returns maximum lifetime for BUs determined by the lifetime of
* care-of address and the lifetime of home address.
**/
__u32 mipv6_mn_get_bulifetime(struct in6_addr *home_addr, struct in6_addr *coa,
__u8 flags)
{
__u32 lifetime;
struct inet6_ifaddr * ifp_coa, *ifp_hoa;
ifp_hoa = ipv6_get_ifaddr(home_addr, NULL);
if(!ifp_hoa) {
DEBUG((DBG_ERROR, "home address missing"));
return 0;
}
ifp_coa = ipv6_get_ifaddr(coa, NULL);
if (!ifp_coa) {
in6_ifa_put(ifp_hoa);
DEBUG((DBG_ERROR, "care-of address missing"));
return 0;
}
if (flags & MIPV6_BU_F_HOME)
lifetime = HA_BU_DEF_LIFETIME;
else
lifetime = CN_BU_DEF_LIFETIME;
if (!(ifp_hoa->flags & IFA_F_PERMANENT)){
if (ifp_hoa->valid_lft)
lifetime = min_t(__u32, lifetime, ifp_hoa->valid_lft);
else
DEBUG((DBG_ERROR, "Zero lifetime for home address"));
}
if (!(ifp_coa->flags & IFA_F_PERMANENT)) {
if(ifp_coa->valid_lft)
lifetime = min_t(__u32, lifetime, ifp_coa->valid_lft);
else
DEBUG((DBG_ERROR, "Zero lifetime for home address"));
}
in6_ifa_put(ifp_hoa);
in6_ifa_put(ifp_coa);
DEBUG((DBG_INFO, "Lifetime for binding is %ld", lifetime));
return lifetime;
}
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);
}
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);
}
static int ip6_dst_lookup_tail(struct sock *sk,
struct dst_entry **dst, struct flowi6 *fl6)
{
struct net *net = sock_net(sk);
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
struct neighbour *n;
#endif
int err;
if (*dst == NULL)
*dst = ip6_route_output(net, sk, fl6);
if ((err = (*dst)->error))
goto out_err_release;
if (ipv6_addr_any(&fl6->saddr)) {
struct rt6_info *rt = (struct rt6_info *) *dst;
err = ip6_route_get_saddr(net, rt, &fl6->daddr,
sk ? inet6_sk(sk)->srcprefs : 0,
&fl6->saddr);
if (err)
goto out_err_release;
}
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
/*
* Here if the dst entry we've looked up
* has a neighbour entry that is in the INCOMPLETE
* state and the src address from the flow is
* marked as OPTIMISTIC, we release the found
* dst entry and replace it instead with the
* dst entry of the nexthop router
*/
rcu_read_lock();
n = dst_get_neighbour(*dst);
if (n && !(n->nud_state & NUD_VALID)) {
struct inet6_ifaddr *ifp;
struct flowi6 fl_gw6;
int redirect;
rcu_read_unlock();
ifp = ipv6_get_ifaddr(net, &fl6->saddr,
(*dst)->dev, 1);
redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
if (ifp)
in6_ifa_put(ifp);
if (redirect) {
/*
* We need to get the dst entry for the
* default router instead
*/
dst_release(*dst);
memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
*dst = ip6_route_output(net, sk, &fl_gw6);
if ((err = (*dst)->error))
goto out_err_release;
}
} else {
rcu_read_unlock();
}
#endif
return 0;
out_err_release:
if (err == -ENETUNREACH)
IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES);
dst_release(*dst);
*dst = NULL;
return err;
}
static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
struct dst_entry **dst, struct flowi6 *fl6)
{
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
struct neighbour *n;
struct rt6_info *rt;
#endif
int err;
int flags = 0;
/* The correct way to handle this would be to do
* ip6_route_get_saddr, and then ip6_route_output; however,
* the route-specific preferred source forces the
* ip6_route_output call _before_ ip6_route_get_saddr.
*
* In source specific routing (no src=any default route),
* ip6_route_output will fail given src=any saddr, though, so
* that's why we try it again later.
*/
if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
struct rt6_info *rt;
bool had_dst = *dst != NULL;
if (!had_dst)
*dst = ip6_route_output(net, sk, fl6);
rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
err = ip6_route_get_saddr(net, rt, &fl6->daddr,
sk ? inet6_sk(sk)->srcprefs : 0,
&fl6->saddr);
if (err)
goto out_err_release;
/* If we had an erroneous initial result, pretend it
* never existed and let the SA-enabled version take
* over.
*/
if (!had_dst && (*dst)->error) {
dst_release(*dst);
*dst = NULL;
}
if (fl6->flowi6_oif)
flags |= RT6_LOOKUP_F_IFACE;
}
if (!*dst)
*dst = ip6_route_output_flags(net, sk, fl6, flags);
err = (*dst)->error;
if (err)
goto out_err_release;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
/*
* Here if the dst entry we've looked up
* has a neighbour entry that is in the INCOMPLETE
* state and the src address from the flow is
* marked as OPTIMISTIC, we release the found
* dst entry and replace it instead with the
* dst entry of the nexthop router
*/
rt = (struct rt6_info *) *dst;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref(rt->dst.dev,
rt6_nexthop(rt, &fl6->daddr));
err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
rcu_read_unlock_bh();
if (err) {
struct inet6_ifaddr *ifp;
struct flowi6 fl_gw6;
int redirect;
ifp = ipv6_get_ifaddr(net, &fl6->saddr,
(*dst)->dev, 1);
redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
if (ifp)
in6_ifa_put(ifp);
if (redirect) {
/*
* We need to get the dst entry for the
* default router instead
*/
dst_release(*dst);
memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
*dst = ip6_route_output(net, sk, &fl_gw6);
err = (*dst)->error;
if (err)
goto out_err_release;
}
}
#endif
return 0;
out_err_release:
if (err == -ENETUNREACH)
IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
dst_release(*dst);
*dst = NULL;
return err;
}
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);
}
/*
* 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;
}
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);
}
}
}
}
}