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ipv6: handle Redirect ICMP Message with no Redirected Header option 

rfc 4861 says the Redirected Header option is optional, so
the kernel should not drop the Redirect Message that has no
Redirected Header option. In this patch, the function
ip6_redirect_no_header() is introduced to deal with that
condition.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
This commit is contained in:
Duan Jiong 2013-08-22 12:07:35 +08:00 committed by David S. Miller
parent 6e1f99757a
commit c92a59eca8
3 changed files with 26 additions and 1 deletions
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2
include/net/ip6_route.h
View File

@ -135,6 +135,8 @@ extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
__be32 mtu);
extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
extern void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
u32 mark);
extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
struct netlink_callback;

4
net/ipv6/ndisc.c
View File

@ -1369,8 +1369,10 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
return;
if (!ndopts.nd_opts_rh)
if (!ndopts.nd_opts_rh) {
ip6_redirect_no_header(skb, dev_net(skb->dev), 0, 0);
return;
}
hdr = (u8 *)ndopts.nd_opts_rh;
hdr += 8;

21
net/ipv6/route.c
View File

@ -1178,6 +1178,27 @@ void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
}
EXPORT_SYMBOL_GPL(ip6_redirect);
void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
u32 mark)
{
const struct ipv6hdr *iph = ipv6_hdr(skb);
const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
struct dst_entry *dst;
struct flowi6 fl6;
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_oif = oif;
fl6.flowi6_mark = mark;
fl6.flowi6_flags = 0;
fl6.daddr = msg->dest;
fl6.saddr = iph->daddr;
dst = ip6_route_output(net, NULL, &fl6);
if (!dst->error)
rt6_do_redirect(dst, NULL, skb);
dst_release(dst);
}
void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
{
ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);