diff options
| -rw-r--r-- | net/ipv6/ndisc.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 539b2ec37d3..53a545f3262 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, |