Hi,
When kernel receives a package with a wrong destination ipv4 address, it can't
increase "InAddrErrors" number correctly.
InAddrErrors is located in /proc/net/snmp.
This is a patch for fixing this problem.
Signed-off-by: Gui Jianfeng <[EMAIL PROTECTED]>
---
diff -Narup linux-2.4.35.3/net/ipv4/ip_input.c
linux-2.4.35.3-prep/net/ipv4/ip_input.c
--- linux-2.4.35.3/net/ipv4/ip_input.c 2007-09-24 06:02:58.000000000 +0800
+++ linux-2.4.35.3-prep/net/ipv4/ip_input.c 2007-09-26 01:24:08.000000000
+0800
@@ -310,8 +310,12 @@ static inline int ip_rcv_finish(struct s
* how the packet travels inside Linux networking.
*/
if (skb->dst == NULL) {
- if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))
- goto drop;
+ int err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
dev);
+ if (unlikely(err)) {
+ if (err == -EHOSTUNREACH)
+ IP_INC_STATS_BH(IpInAddrErrors);
+ }
+ goto drop;
}
#ifdef CONFIG_NET_CLS_ROUTE
diff -Narup linux-2.4.35.3/net/ipv4/route.c linux-2.4.35.3-prep/net/ipv4/route.c
--- linux-2.4.35.3/net/ipv4/route.c 2007-09-24 06:02:58.000000000 +0800
+++ linux-2.4.35.3-prep/net/ipv4/route.c 2007-09-26 01:26:15.000000000
+0800
@@ -1450,7 +1450,7 @@ int ip_route_input_slow(struct sk_buff *
*/
if ((err = fib_lookup(&key, &res)) != 0) {
if (!IN_DEV_FORWARD(in_dev))
- goto e_inval;
+ goto e_hostunreach;
goto no_route;
}
free_res = 1;
@@ -1499,7 +1499,7 @@ int ip_route_input_slow(struct sk_buff *
}
if (!IN_DEV_FORWARD(in_dev))
- goto e_inval;
+ goto e_hostunreach;
if (res.type != RTN_UNICAST)
goto martian_destination;
@@ -1668,6 +1668,11 @@ martian_destination:
"%u.%u.%u.%u, dev %s\n",
NIPQUAD(daddr), NIPQUAD(saddr), dev->name);
#endif
+
+e_hostunreach:
+ err = -EHOSTUNREACH;
+ goto done;
+
e_inval:
err = -EINVAL;
goto done;
-
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