ipv6: Do not assign non-valid address on interface.
Check the type of the address when adding a new one on interface.
- the unspecified address (::) is always disallowed (RFC4291 2.5.2)
- the loopback address is disallowed unless the interface is (one of)
loopback (RFC4291 2.5.3).
- multicast addresses are disallowed.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 84127d8..8b6875f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -578,6 +578,13 @@
struct rt6_info *rt;
int hash;
int err = 0;
+ int addr_type = ipv6_addr_type(addr);
+
+ if (addr_type == IPV6_ADDR_ANY ||
+ addr_type & IPV6_ADDR_MULTICAST ||
+ (!(idev->dev->flags & IFF_LOOPBACK) &&
+ addr_type & IPV6_ADDR_LOOPBACK))
+ return ERR_PTR(-EADDRNOTAVAIL);
rcu_read_lock_bh();
if (idev->dead) {