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authorDavid S. Miller <davem@davemloft.net>2012-07-11 21:25:45 -0700
committerDavid S. Miller <davem@davemloft.net>2012-07-11 21:25:45 -0700
commitb42597e2f36e2043756aa7462faddf630962f061 (patch)
tree67264d31f7bf3cf2f0771260a3c7fc871423231a
parentipv4: Generalize ip_do_redirect() and hook into new dst_ops->redirect. (diff)
downloadlinux-dev-b42597e2f36e2043756aa7462faddf630962f061.tar.xz
linux-dev-b42597e2f36e2043756aa7462faddf630962f061.zip
ipv4: Add ipv4_redirect() and ipv4_sk_redirect() helper functions.
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/route.h3
-rw-r--r--net/ipv4/route.c28
2 files changed, 31 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h
index b1402787aecb..6ab93eeb8660 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -180,6 +180,9 @@ static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 s
extern void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,
int oif, u32 mark, u8 protocol, int flow_flags);
extern void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
+extern void ipv4_redirect(struct sk_buff *skb, struct net *net,
+ int oif, u32 mark, u8 protocol, int flow_flags);
+extern void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
extern void ip_rt_send_redirect(struct sk_buff *skb);
extern unsigned int inet_addr_type(struct net *net, __be32 addr);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index f3d25656ddb0..aabece6b729a 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1590,6 +1590,34 @@ void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
}
EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu);
+void ipv4_redirect(struct sk_buff *skb, struct net *net,
+ int oif, u32 mark, u8 protocol, int flow_flags)
+{
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ struct flowi4 fl4;
+ struct rtable *rt;
+
+ flowi4_init_output(&fl4, oif, mark, RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
+ protocol, flow_flags, iph->daddr, iph->saddr, 0, 0);
+ rt = __ip_route_output_key(net, &fl4);
+ if (!IS_ERR(rt)) {
+ ip_do_redirect(&rt->dst, skb);
+ ip_rt_put(rt);
+ }
+}
+EXPORT_SYMBOL_GPL(ipv4_redirect);
+
+void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+
+ return ipv4_redirect(skb, sock_net(sk), sk->sk_bound_dev_if,
+ sk->sk_mark,
+ inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
+ inet_sk_flowi_flags(sk));
+}
+EXPORT_SYMBOL_GPL(ipv4_sk_redirect);
+
static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
{
struct rtable *rt = (struct rtable *) dst;