[RFC 04/12] ndisc: get rid off dev parameter in ndisc_opt_addr_space

[Alexander Aring <aar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

This patch removes the net_device parameter from ndisc_opt_addr_space
function. This can be useful for calling such functionality which
doesn't depends on dev parameter. For current existing functionality
which depends on dev parameter, we introduce ndisc_dev_opt_addr_space to have
an easy replacement for the ndisc_opt_addr_space function.

Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Alexey Kuznetsov <kuznet-v/Mj1YrvjDBInbfyfbPRSQ@public.gmane.org>
Cc: James Morris <jmorris-gx6/JNMH7DfYtjvyW6yDsg@public.gmane.org>
Cc: Hideaki YOSHIFUJI <yoshfuji-VfPWfsRibaP+Ru+s062T9g@public.gmane.org>
Cc: Patrick McHardy <kaber-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
Signed-off-by: Alexander Aring <aar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
 include/net/ndisc.h | 13 +++++++++----
 net/ipv6/ndisc.c    | 12 ++++++------
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 2d8edaa..dbc8d01 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -127,10 +127,15 @@ static inline int ndisc_addr_option_pad(unsigned short type)
 	}
 }
 
-static inline int ndisc_opt_addr_space(struct net_device *dev)
+static inline int ndisc_opt_addr_space(unsigned char addr_len, int pad)
 {
-	return NDISC_OPT_SPACE(dev->addr_len +
-			       ndisc_addr_option_pad(dev->type));
+	return NDISC_OPT_SPACE(addr_len + pad);
+}
+
+static inline int ndisc_dev_opt_addr_space(const struct net_device *dev)
+{
+	return ndisc_opt_addr_space(dev->addr_len,
+				    ndisc_addr_option_pad(dev->type));
 }
 
 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
@@ -139,7 +144,7 @@ static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
 	u8 *lladdr = (u8 *)(p + 1);
 	int lladdrlen = p->nd_opt_len << 3;
 	int prepad = ndisc_addr_option_pad(dev->type);
-	if (lladdrlen != ndisc_opt_addr_space(dev))
+	if (lladdrlen != ndisc_opt_addr_space(dev->addr_len, prepad))
 		return NULL;
 	return lladdr + prepad;
 }
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index c245895..2241f06 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -152,9 +152,9 @@ EXPORT_SYMBOL_GPL(nd_tbl);
 
 static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data)
 {
-	int pad   = ndisc_addr_option_pad(skb->dev->type);
+	int pad = ndisc_addr_option_pad(skb->dev->type);
 	int data_len = skb->dev->addr_len;
-	int space = ndisc_opt_addr_space(skb->dev);
+	int space = ndisc_opt_addr_space(data_len, pad);
 	u8 *opt = skb_put(skb, space);
 
 	opt[0] = type;
@@ -509,7 +509,7 @@ void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
 	if (!dev->addr_len)
 		inc_opt = 0;
 	if (inc_opt)
-		optlen += ndisc_opt_addr_space(dev);
+		optlen += ndisc_dev_opt_addr_space(dev);
 
 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
 	if (!skb)
@@ -574,7 +574,7 @@ void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
 	if (ipv6_addr_any(saddr))
 		inc_opt = false;
 	if (inc_opt)
-		optlen += ndisc_opt_addr_space(dev);
+		optlen += ndisc_dev_opt_addr_space(dev);
 
 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
 	if (!skb)
@@ -626,7 +626,7 @@ void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
 	}
 #endif
 	if (send_sllao)
-		optlen += ndisc_opt_addr_space(dev);
+		optlen += ndisc_dev_opt_addr_space(dev);
 
 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
 	if (!skb)
@@ -1563,7 +1563,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
 			memcpy(ha_buf, neigh->ha, dev->addr_len);
 			read_unlock_bh(&neigh->lock);
 			ha = ha_buf;
-			optlen += ndisc_opt_addr_space(dev);
+			optlen += ndisc_dev_opt_addr_space(dev);
 		} else
 			read_unlock_bh(&neigh->lock);
 
-- 
2.8.2