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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>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-21 06:48:09 +00:00 committed by David S. Miller
parent 6bce6b4e16
commit 9c86dafe94
1 changed files with 15 additions and 6 deletions
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21
net/ipv6/ndisc.c
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@ -1341,6 +1341,19 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); 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) void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
{ {
struct net_device *dev = skb->dev; 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. * build redirect option and copy skb over to the new packet.
*/ */
memset(opt, 0, 8); if (rd_len)
*(opt++) = ND_OPT_REDIRECT_HDR; opt = ndisc_fill_redirect_hdr_option(opt, skb, rd_len);
*(opt++) = (rd_len >> 3);
opt += 6;
memcpy(opt, ipv6_hdr(skb), rd_len - 8);
msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
len, IPPROTO_ICMPV6, len, IPPROTO_ICMPV6,