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ipv6: Add ip6_redirect() and ip6_sk_redirect() helper functions. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-12 00:08:07 -07:00
parent 6e157b6ac6
commit 3a5ad2ee5e
2 changed files with 29 additions and 0 deletions
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2
include/net/ip6_route.h
View File

@ -139,6 +139,8 @@ extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
int oif, u32 mark);
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_sk_redirect(struct sk_buff *skb, struct sock *sk);
struct netlink_callback;

27
net/ipv6/route.c
View File

@ -1114,6 +1114,33 @@ void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
}
EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
{
const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
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 = iph->daddr;
fl6.saddr = iph->saddr;
fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;
dst = ip6_route_output(net, NULL, &fl6);
if (!dst->error)
rt6_do_redirect(dst, skb);
dst_release(dst);
}
EXPORT_SYMBOL_GPL(ip6_redirect);
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);
}
EXPORT_SYMBOL_GPL(ip6_sk_redirect);
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
{
struct net_device *dev = dst->dev;