[IPV6] ADDRCONF: Allow user-space to specify address lifetime

Based on MIPL2 kernel patch.

Signed-off-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 81702b9..c064188 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1869,15 +1869,21 @@ err_exit:
 /*
  *     Manual configuration of address on an interface
  */
-static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
+static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
+                         __u32 prefered_lft, __u32 valid_lft)
 {
        struct inet6_ifaddr *ifp;
        struct inet6_dev *idev;
        struct net_device *dev;
+       __u8 ifa_flags = 0;
        int scope;
 
        ASSERT_RTNL();
        
+       /* check the lifetime */
+       if (!valid_lft || prefered_lft > valid_lft)
+               return -EINVAL;
+
        if ((dev = __dev_get_by_index(ifindex)) == NULL)
                return -ENODEV;
        
@@ -1889,10 +1895,29 @@ static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
 
        scope = ipv6_addr_scope(pfx);
 
-       ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
+       if (valid_lft == INFINITY_LIFE_TIME)
+               ifa_flags |= IFA_F_PERMANENT;
+       else if (valid_lft >= 0x7FFFFFFF/HZ)
+               valid_lft = 0x7FFFFFFF/HZ;
+
+       if (prefered_lft == 0)
+               ifa_flags |= IFA_F_DEPRECATED;
+       else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
+                (prefered_lft != INFINITY_LIFE_TIME))
+               prefered_lft = 0x7FFFFFFF/HZ;
+
+       ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
+
        if (!IS_ERR(ifp)) {
+               spin_lock(&ifp->lock);
+               ifp->valid_lft = valid_lft;
+               ifp->prefered_lft = prefered_lft;
+               ifp->tstamp = jiffies;
+               spin_unlock(&ifp->lock);
+
                addrconf_dad_start(ifp, 0);
                in6_ifa_put(ifp);
+               addrconf_verify(0);
                return 0;
        }
 
@@ -1945,7 +1970,8 @@ int addrconf_add_ifaddr(void __user *arg)
                return -EFAULT;
 
        rtnl_lock();
-       err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
+       err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
+                            INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
        rtnl_unlock();
        return err;
 }
@@ -2870,6 +2896,7 @@ 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;
+       __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME;
 
        pfx = NULL;
        if (rta[IFA_ADDRESS-1]) {
@@ -2886,7 +2913,18 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
        if (pfx == NULL)
                return -EINVAL;
 
-       return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
+       if (rta[IFA_CACHEINFO-1]) {
+               struct ifa_cacheinfo *ci;
+               if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci))
+                       return -EINVAL;
+               ci = RTA_DATA(rta[IFA_CACHEINFO-1]);
+               valid_lft = ci->ifa_valid;
+               prefered_lft = ci->ifa_prefered;
+       }
+
+       return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
+                             prefered_lft, valid_lft);
+
 }
 
 /* Maximum length of ifa_cacheinfo attributes */