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

[Alexander Aring]

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 <da...@davemloft.net>
Cc: Alexey Kuznetsov <kuz...@ms2.inr.ac.ru>
Cc: James Morris <jmor...@namei.org>
Cc: Hideaki YOSHIFUJI <yoshf...@linux-ipv6.org>
Cc: Patrick McHardy <ka...@trash.net>
Signed-off-by: Alexander Aring <a...@pengutronix.de>
---
 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