netdev - [PATCH 06/16] ipv4: Add ipv4_redirect() and ipv4_sk

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Message-Id: <20120712.011116.1924700314892943604.davem@davemloft.net>
Date:	Thu, 12 Jul 2012 01:11:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH 06/16] ipv4: Add ipv4_redirect() and ipv4_sk_redirect()
 helper functions.


Signed-off-by: David S. Miller <davem@...emloft.net>
---
 include/net/route.h |    3 +++
 net/ipv4/route.c    |   28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/net/route.h b/include/net/route.h
index b140278..6ab93ee 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 f3d2565..aabece6 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;
-- 
1.7.10.4

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