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ipv4: Rearrange arguments to ip_rt_redirect() 

Pass in the SKB rather than just the IP addresses, so that policy
and other aspects can reside in ip_rt_redirect() rather then
icmp_redirect().

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-11 20:38:08 -07:00
parent d0da720f9f
commit 94206125c4
3 changed files with 27 additions and 37 deletions
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3
include/net/route.h
View File

@ -108,8 +108,7 @@ extern struct ip_rt_acct __percpu *ip_rt_acct;
struct in_device;
extern int ip_rt_init(void);
extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
__be32 src, struct net_device *dev);
extern void ip_rt_redirect(struct sk_buff *skb, __be32 new_gw);
extern void rt_cache_flush(struct net *net, int how);
extern void rt_cache_flush_batch(struct net *net);
extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);

38
net/ipv4/icmp.c
View File

@ -755,40 +755,16 @@ out_err:
static void icmp_redirect(struct sk_buff *skb)
{
const struct iphdr *iph;
if (skb->len < sizeof(struct iphdr))
goto out_err;
/*
* Get the copied header of the packet that caused the redirect
*/
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto out;
iph = (const struct iphdr *)skb->data;
switch (icmp_hdr(skb)->code & 7) {
case ICMP_REDIR_NET:
case ICMP_REDIR_NETTOS:
/*
* As per RFC recommendations now handle it as a host redirect.
*/
case ICMP_REDIR_HOST:
case ICMP_REDIR_HOSTTOS:
ip_rt_redirect(ip_hdr(skb)->saddr, iph->daddr,
icmp_hdr(skb)->un.gateway,
iph->saddr, skb->dev);
break;
if (skb->len < sizeof(struct iphdr)) {
ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
return;
}
icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway);
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
return;
out:
return;
out_err:
ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
goto out;
ip_rt_redirect(skb, icmp_hdr(skb)->un.gateway);
icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway);
}
/*

23
net/ipv4/route.c
View File

@ -1292,18 +1292,33 @@ static void ip_do_redirect(struct rtable *rt, __be32 old_gw, __be32 new_gw)
}
/* called in rcu_read_lock() section */
void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
__be32 saddr, struct net_device *dev)
void ip_rt_redirect(struct sk_buff *skb, __be32 new_gw)
{
int s, i;
const struct iphdr *iph = (const struct iphdr *) skb->data;
__be32 old_gw = ip_hdr(skb)->saddr;
__be32 daddr = iph->daddr;
__be32 saddr = iph->saddr;
struct net_device *dev = skb->dev;
struct in_device *in_dev = __in_dev_get_rcu(dev);
__be32 skeys[2] = { saddr, 0 };
int ikeys[2] = { dev->ifindex, 0 };
__be32 skeys[2] = { saddr, 0 };
struct net *net;
int s, i;
if (!in_dev)
return;
switch (icmp_hdr(skb)->code & 7) {
case ICMP_REDIR_NET:
case ICMP_REDIR_NETTOS:
case ICMP_REDIR_HOST:
case ICMP_REDIR_HOSTTOS:
break;
default:
return;
}
net = dev_net(dev);
if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) ||
ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) ||