[IPV6] ADDRCONF: Support get operation of single address

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 93a40a8ade88f66d9968c304038eefef2f7b14f8..3ef3fe20283f03825e74c04cab12637430b98f03 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3165,6 +3165,62 @@ static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
        return inet6_dump_addr(skb, cb, type);
 }
 
+static int inet6_rtm_getaddr(struct sk_buff *in_skb,
+               struct nlmsghdr* nlh, void *arg)
+{
+       struct rtattr **rta = arg;
+       struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
+       struct in6_addr *addr = NULL;
+       struct net_device *dev = NULL;
+       struct inet6_ifaddr *ifa;
+       struct sk_buff *skb;
+       int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
+       int err;
+
+       if (rta[IFA_ADDRESS-1]) {
+               if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr))
+                       return -EINVAL;
+               addr = RTA_DATA(rta[IFA_ADDRESS-1]);
+       }
+       if (rta[IFA_LOCAL-1]) {
+               if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) ||
+                   (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr))))
+                       return -EINVAL;
+               addr = RTA_DATA(rta[IFA_LOCAL-1]);
+       }
+       if (addr == NULL)
+               return -EINVAL;
+
+       if (ifm->ifa_index)
+               dev = __dev_get_by_index(ifm->ifa_index);
+
+       if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL)
+               return -EADDRNOTAVAIL;
+
+       if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) {
+               err = -ENOBUFS;
+               goto out;
+       }
+
+       NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+       err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
+                               nlh->nlmsg_seq, RTM_NEWADDR, 0);
+       if (err < 0) {
+               err = -EMSGSIZE;
+               goto out_free;
+       }
+
+       err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
+       if (err > 0)
+               err = 0;
+out:
+       in6_ifa_put(ifa);
+       return err;
+out_free:
+       kfree_skb(skb);
+       goto out;
+}
+
 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
 {
        struct sk_buff *skb;
@@ -3407,7 +3463,8 @@ static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
        [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
        [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
        [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
-       [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
+       [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
+                                    .dumpit    = inet6_dump_ifaddr, },
        [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
        [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
        [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },