ipv6: support IFA_F_MANAGETEMPADDR for address deletion too

Userspace applications can use IFA_F_MANAGETEMPADDR with RTM_NEWADDR
already to indicate that the kernel should take care of temporary
address management.

This patch adds related functionality to RTM_DELADDR. By setting
IFA_F_MANAGETEMPADDR a userspace application can indicate that the kernel
should delete all related temporary addresses as well.

A corresponding patch for the "ip addr del" command has been applied to
iproute2 already.

Signed-off-by: Heiner Kallweit <heiner.kallweit@web.de>
Reviewed-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6c7fa08..fc203db 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2504,8 +2504,8 @@ static int inet6_addr_add(struct net *net, int ifindex,
        return PTR_ERR(ifp);
 }
 
-static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
-                         unsigned int plen)
+static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
+                         const struct in6_addr *pfx, unsigned int plen)
 {
        struct inet6_ifaddr *ifp;
        struct inet6_dev *idev;
@@ -2528,7 +2528,12 @@ static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *p
                        in6_ifa_hold(ifp);
                        read_unlock_bh(&idev->lock);
 
+                       if (!(ifp->flags & IFA_F_TEMPORARY) &&
+                           (ifa_flags & IFA_F_MANAGETEMPADDR))
+                               manage_tempaddrs(idev, ifp, 0, 0, false,
+                                                jiffies);
                        ipv6_del_addr(ifp);
+                       addrconf_verify_rtnl();
                        return 0;
                }
        }
@@ -2568,7 +2573,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg)
                return -EFAULT;
 
        rtnl_lock();
-       err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
+       err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
                             ireq.ifr6_prefixlen);
        rtnl_unlock();
        return err;
@@ -3743,6 +3748,7 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
        struct ifaddrmsg *ifm;
        struct nlattr *tb[IFA_MAX+1];
        struct in6_addr *pfx, *peer_pfx;
+       u32 ifa_flags;
        int err;
 
        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
@@ -3754,7 +3760,13 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
        if (pfx == NULL)
                return -EINVAL;
 
-       return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
+       ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+       /* We ignore other flags so far. */
+       ifa_flags &= IFA_F_MANAGETEMPADDR;
+
+       return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
+                             ifm->ifa_prefixlen);
 }
 
 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,