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ipv4: fix error handling in icmp_protocol.

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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: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li Wei 2013-02-21 22:18:44 +00:00 committed by David S. Miller
parent 08dcdbf6a7
commit 5b0520425e
3 changed files with 25 additions and 1 deletions
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1
include/net/icmp.h
View file

@ -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);

2
net/ipv4/af_inet.c
View file

@ -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,
};

23
net/ipv4/icmp.c
View file

@ -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.
*/