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authorYOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>2013-01-21 06:48:09 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-21 13:33:14 -0500
commit9c86dafe94f03679b77d85915e65da1304005a7c (patch)
tree30e4f17c3d6475337413921fc54b772f5890ba6e /net/ipv6/ndisc.c
parent6bce6b4e16e46cc860175b9e10a283194ef9f004 (diff)
ndisc: Introduce ndisc_fill_redirect_hdr_option().
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 539b2ec37d3a..53a545f32625 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1341,6 +1341,19 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
}
+static u8 *ndisc_fill_redirect_hdr_option(u8 *opt, struct sk_buff *orig_skb,
+ int rd_len)
+{
+ memset(opt, 0, 8);
+ *(opt++) = ND_OPT_REDIRECT_HDR;
+ *(opt++) = (rd_len >> 3);
+ opt += 6;
+
+ memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8);
+
+ return opt + rd_len - 8;
+}
+
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
{
struct net_device *dev = skb->dev;
@@ -1470,12 +1483,8 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
* build redirect option and copy skb over to the new packet.
*/
- memset(opt, 0, 8);
- *(opt++) = ND_OPT_REDIRECT_HDR;
- *(opt++) = (rd_len >> 3);
- opt += 6;
-
- memcpy(opt, ipv6_hdr(skb), rd_len - 8);
+ if (rd_len)
+ opt = ndisc_fill_redirect_hdr_option(opt, skb, rd_len);
msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
len, IPPROTO_ICMPV6,