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| author | David S. Miller <davem@davemloft.net> | 2012-07-11 21:25:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-11 21:25:45 -0700 |
| commit | b42597e2f36e2043756aa7462faddf630962f061 (patch) | |
| tree | 67264d31f7bf3cf2f0771260a3c7fc871423231a | |
| parent | e47a185b31dd2acd424fac7dc0efb96fc5b31a33 (diff) | |
| download | linux-3.10-b42597e2f36e2043756aa7462faddf630962f061.tar.gz linux-3.10-b42597e2f36e2043756aa7462faddf630962f061.tar.bz2 linux-3.10-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.h | 3 | ||||
| -rw-r--r-- | net/ipv4/route.c | 28 |
2 files changed, 31 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h index b1402787aec..6ab93eeb866 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 f3d25656ddb..aabece6b729 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; |