netdev - [PATCHv4 net-next 05/12] ndisc: add __ndisc_opt_addr

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Message-Id: <20160615192027.4064-6-aar@pengutronix.de>
Date:	Wed, 15 Jun 2016 21:20:20 +0200
From:	Alexander Aring <aar@...gutronix.de>
To:	linux-wpan@...r.kernel.org
Cc:	kernel@...gutronix.de, marcel@...tmann.org,
	jukka.rissanen@...ux.intel.com, hannes@...essinduktion.org,
	stefan@....samsung.com, mcr@...delman.ca, werner@...esberger.net,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	Alexander Aring <aar@...gutronix.de>,
	"David S . Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: [PATCHv4 net-next 05/12] ndisc: add __ndisc_opt_addr_data function

This patch adds __ndisc_opt_addr_data as low-level function for
ndisc_opt_addr_data which doesn't depend on net_device parameter.

Cc: David S. Miller <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Reviewed-by: Stefan Schmidt <stefan@....samsung.com>
Signed-off-by: Alexander Aring <aar@...gutronix.de>
---
 include/net/ndisc.h | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 4cee826..c8962ad 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -138,17 +138,23 @@ static inline int ndisc_opt_addr_space(struct net_device *dev)
 				      ndisc_addr_option_pad(dev->type));
 }
 
-static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
-				      struct net_device *dev)
+static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
+					unsigned char addr_len, int prepad)
 {
 	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(addr_len, prepad))
 		return NULL;
 	return lladdr + prepad;
 }
 
+static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
+				      struct net_device *dev)
+{
+	return __ndisc_opt_addr_data(p, dev->addr_len,
+				     ndisc_addr_option_pad(dev->type));
+}
+
 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
 {
 	const u32 *p32 = pkey;
-- 
2.8.3