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Commit b42597e2 authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Add ipv4_redirect() and ipv4_sk_redirect() helper functions. 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e47a185b

include/net/route.h

+3 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv4/route.c

+28 −0
Original line number Diff line number Diff line
@@ -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;