Commit 5b052042 authored by Li Wei's avatar Li Wei Committed by David S. Miller

ipv4: fix error handling in icmp_protocol.

Now we handle icmp errors in each transport protocol's err_handler,
for icmp protocols, that is ping_err. Since this handler only care
of those icmp errors triggered by echo request, errors triggered
by echo reply(which sent by kernel) are sliently ignored.

So wrap ping_err() with icmp_err() to deal with those icmp errors.
Signed-off-by: default avatarLi Wei <lw@cn.fujitsu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08dcdbf6
......@@ -41,6 +41,7 @@ struct net;
extern void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info);
extern int icmp_rcv(struct sk_buff *skb);
extern void icmp_err(struct sk_buff *, u32 info);
extern int icmp_init(void);
extern void icmp_out_count(struct net *net, unsigned char type);
......
......@@ -1577,7 +1577,7 @@ static const struct net_offload udp_offload = {
static const struct net_protocol icmp_protocol = {
.handler = icmp_rcv,
.err_handler = ping_err,
.err_handler = icmp_err,
.no_policy = 1,
.netns_ok = 1,
};
......
......@@ -934,6 +934,29 @@ int icmp_rcv(struct sk_buff *skb)
goto drop;
}
void icmp_err(struct sk_buff *skb, u32 info)
{
struct iphdr *iph = (struct iphdr *)skb->data;
struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
int type = icmp_hdr(skb)->type;
int code = icmp_hdr(skb)->code;
struct net *net = dev_net(skb->dev);
/*
* Use ping_err to handle all icmp errors except those
* triggered by ICMP_ECHOREPLY which sent from kernel.
*/
if (icmph->type != ICMP_ECHOREPLY) {
ping_err(skb, info);
return;
}
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ICMP, 0);
else if (type == ICMP_REDIRECT)
ipv4_redirect(skb, net, 0, 0, IPPROTO_ICMP, 0);
}
/*
* This table is the definition of how we handle ICMP.
*/
......
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