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ipv6 addrconf: Allow infinite prefix lifetime.

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We need to handle infinite prefix lifetime specially.
With help from original reporter "Bonitch, Joseph"
<Joseph.Bonitch@xerox.com>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2008-05-19 16:56:11 -07:00 committed by David S. Miller
parent 69cdf8f92a
commit 6f704992d3
2 changed files with 52 additions and 25 deletions
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73
net/ipv6/addrconf.c
View File

@ -1764,14 +1764,16 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
* 2) Configure prefixes with the auto flag set
*/
/* Avoid arithmetic 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)
if (valid_lft == INFINITY_LIFE_TIME)
rt_expires = ~0UL;
else if (valid_lft >= 0x7FFFFFFF/HZ) {
/* Avoid arithmetic overflow. Really, we could
* save rt_expires in seconds, likely valid_lft,
* but it would require division in fib gc, that it
* not good.
*/
rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
else
} else
rt_expires = valid_lft * HZ;
/*
@ -1779,7 +1781,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
* Avoid arithmetic overflow there as well.
* Overflow can happen only if HZ < USER_HZ.
*/
if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
if (HZ < USER_HZ && ~rt_expires && rt_expires > 0x7FFFFFFF / USER_HZ)
rt_expires = 0x7FFFFFFF / USER_HZ;
if (pinfo->onlink) {
@ -1788,17 +1790,28 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
dev->ifindex, 1);
if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
if (rt->rt6i_flags&RTF_EXPIRES) {
if (valid_lft == 0) {
ip6_del_rt(rt);
rt = NULL;
} else {
rt->rt6i_expires = jiffies + rt_expires;
}
/* Autoconf prefix route */
if (valid_lft == 0) {
ip6_del_rt(rt);
rt = NULL;
} else if (~rt_expires) {
/* not infinity */
rt->rt6i_expires = jiffies + rt_expires;
rt->rt6i_flags |= RTF_EXPIRES;
} else {
rt->rt6i_flags &= ~RTF_EXPIRES;
rt->rt6i_expires = 0;
}
} else if (valid_lft) {
int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
clock_t expires = 0;
if (~rt_expires) {
/* not infinity */
flags |= RTF_EXPIRES;
expires = jiffies_to_clock_t(rt_expires);
}
addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
dev, expires, flags);
}
if (rt)
dst_release(&rt->u.dst);
@ -2021,7 +2034,8 @@ static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
struct inet6_dev *idev;
struct net_device *dev;
int scope;
u32 flags = RTF_EXPIRES;
u32 flags;
clock_t expires;
ASSERT_RTNL();
@ -2041,8 +2055,13 @@ static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
if (valid_lft == INFINITY_LIFE_TIME) {
ifa_flags |= IFA_F_PERMANENT;
flags = 0;
} else if (valid_lft >= 0x7FFFFFFF/HZ)
valid_lft = 0x7FFFFFFF/HZ;
expires = 0;
} else {
if (valid_lft >= 0x7FFFFFFF/HZ)
valid_lft = 0x7FFFFFFF/HZ;
flags = RTF_EXPIRES;
expires = jiffies_to_clock_t(valid_lft * HZ);
}
if (prefered_lft == 0)
ifa_flags |= IFA_F_DEPRECATED;
@ -2060,7 +2079,7 @@ static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
spin_unlock_bh(&ifp->lock);
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
jiffies_to_clock_t(valid_lft * HZ), flags);
expires, flags);
/*
* Note that section 3.1 of RFC 4429 indicates
* that the Optimistic flag should not be set for
@ -3148,7 +3167,8 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
u32 prefered_lft, u32 valid_lft)
{
u32 flags = RTF_EXPIRES;
u32 flags;
clock_t expires;
if (!valid_lft || (prefered_lft > valid_lft))
return -EINVAL;
@ -3156,8 +3176,13 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
if (valid_lft == INFINITY_LIFE_TIME) {
ifa_flags |= IFA_F_PERMANENT;
flags = 0;
} else if (valid_lft >= 0x7FFFFFFF/HZ)
valid_lft = 0x7FFFFFFF/HZ;
expires = 0;
} else {
if (valid_lft >= 0x7FFFFFFF/HZ)
valid_lft = 0x7FFFFFFF/HZ;
flags = RTF_EXPIRES;
expires = jiffies_to_clock_t(valid_lft * HZ);
}
if (prefered_lft == 0)
ifa_flags |= IFA_F_DEPRECATED;
@ -3176,7 +3201,7 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
ipv6_ifa_notify(0, ifp);
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
jiffies_to_clock_t(valid_lft * HZ), flags);
expires, flags);
addrconf_verify(0);
return 0;

4
net/ipv6/route.c
View File

@ -1106,7 +1106,9 @@ int ip6_route_add(struct fib6_config *cfg)
}
rt->u.dst.obsolete = -1;
rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ?
jiffies + clock_t_to_jiffies(cfg->fc_expires) :
0;
if (cfg->fc_protocol == RTPROT_UNSPEC)
cfg->fc_protocol = RTPROT_BOOT;