ndisc: Move ndisc_opt_addr_space() to include/net/ndisc.h.

This also makes ndisc_opt_addr_data() and ndisc_fill_addr_option()
use ndisc_opt_addr_space().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index ec48f42db5ed..745bf741e029 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -127,13 +127,19 @@ static int ndisc_addr_option_pad(unsigned short type)
         }
 }
 
+static inline int ndisc_opt_addr_space(struct net_device *dev)
+{
+        return NDISC_OPT_SPACE(dev->addr_len +
+                               ndisc_addr_option_pad(dev->type));
+}
+
 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
                                       struct net_device *dev)
 {
         u8 *lladdr = (u8 *)(p + 1);
         int lladdrlen = p->nd_opt_len << 3;
         int prepad = ndisc_addr_option_pad(dev->type);
-        if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
+        if (lladdrlen != ndisc_opt_addr_space(dev))
                 return NULL;
         return lladdr + prepad;
 }