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;
}
/**
* 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 ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
int router, int solicited, int override, int inc_opt)
{
struct in6_addr tmpaddr;
struct inet6_ifaddr *ifp;
const struct in6_addr *src_addr;
struct icmp6hdr icmp6h = {
.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
};
/* for anycast or proxy, solicited_addr != src_addr */
ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
if (ifp) {
src_addr = solicited_addr;
if (ifp->flags & IFA_F_OPTIMISTIC)
override = 0;
inc_opt |= ifp->idev->cnf.force_tllao;
in6_ifa_put(ifp);
} else {
if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
&tmpaddr))
return;
src_addr = &tmpaddr;
}
icmp6h.icmp6_router = router;
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;
}
in6_dev_put(idev);
}
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 in6_addr *src_addr;
struct icmp6hdr icmp6h = {
.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
};
/* for anycast or proxy, solicited_addr != src_addr */
ifp = ipv6_get_ifaddr(solicited_addr, dev, 1);
if (ifp) {
src_addr = solicited_addr;
if (ifp->flags & IFA_F_OPTIMISTIC)
override = 0;
in6_ifa_put(ifp);
} else {
if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
return;
src_addr = &tmpaddr;
}
icmp6h.icmp6_router = router;
icmp6h.icmp6_solicited = solicited;
icmp6h.icmp6_override = override;
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);
}
