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Date: Wed, 17 Dec 2008 09:26:22 +0100 (CET)
From: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
To: Jan Engelhardt <jengelh@...ozas.de>
cc: Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>,
ajax@...hat.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] net: Remove a noisy printk
On Tue, 16 Dec 2008, Jan Engelhardt wrote:
> Here is a patch that attempts silence both the fraction
> that wants to keep the printk and those to get rid of it.
> It trips up on the bloatmeters, though.
Based on your patch, here is another one: the printk is removed from
everywhere except the filter tables where it's controlled by the module
parameter. The checking against short packets was missing from
ip6table_raw.c, so it's added as well.
diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
index 1ea677d..9527e2a 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -19,6 +19,10 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@...filter.org>");
MODULE_DESCRIPTION("iptables filter table");
+/* Default log short RAW packets */
+static unsigned int happy_cracking = 1;
+module_param(happy_cracking, bool, 0400);
+
#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT))
@@ -94,7 +98,8 @@ ipt_local_out_hook(unsigned int hook,
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
+ if (happy_cracking && net_ratelimit())
+ /* FIXME: log process pid */
printk("iptable_filter: ignoring short SOCK_RAW "
"packet.\n");
return NF_ACCEPT;
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index da59182..773d6ed 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -132,12 +132,8 @@ ipt_local_hook(unsigned int hook,
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr)
- || ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("iptable_mangle: ignoring short SOCK_RAW "
- "packet.\n");
+ || ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- }
/* Save things which could affect route */
mark = skb->mark;
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
index fddce77..71547fa 100644
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -65,12 +65,8 @@ ipt_local_hook(unsigned int hook,
{
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("iptable_raw: ignoring short SOCK_RAW "
- "packet.\n");
+ ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- }
return ipt_do_table(skb, hook, in, out,
nf_local_out_net(in, out)->ipv4.iptable_raw);
}
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 7eb0b61..d20c0a0 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -185,11 +185,8 @@ static unsigned int ipv4_conntrack_local(unsigned int hooknum,
{
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("ipt_hook: happy cracking.\n");
+ ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- }
return nf_conntrack_in(PF_INET, hooknum, skb);
}
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index 55a2c29..a74b0e6 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -17,6 +17,10 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@...filter.org>");
MODULE_DESCRIPTION("ip6tables filter table");
+/* Default log short RAW packets */
+static unsigned int happy_cracking = 1;
+module_param(happy_cracking, bool, 0400);
+
#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT))
@@ -89,15 +93,14 @@ ip6t_local_out_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
-#if 0
/* root is playing with raw sockets. */
- if (skb->len < sizeof(struct iphdr)
- || ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("ip6t_hook: happy cracking.\n");
+ if (skb->len < sizeof(struct ipv6hdr)) {
+ if (happy_cracking && net_ratelimit())
+ /* FIXME: log process pid */
+ printk("ip6table_filter: ignoring short SOCK_RAW "
+ "packet.\n");
return NF_ACCEPT;
}
-#endif
return ip6t_do_table(skb, hook, in, out,
nf_local_out_net(in, out)->ipv6.ip6table_filter);
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index f405cea..5c93909 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -89,15 +89,9 @@ ip6t_local_hook(unsigned int hook,
u_int8_t hop_limit;
u_int32_t flowlabel, mark;
-#if 0
/* root is playing with raw sockets. */
- if (skb->len < sizeof(struct iphdr)
- || ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("ip6t_hook: happy cracking.\n");
+ if (skb->len < sizeof(struct ipv6hdr))
return NF_ACCEPT;
- }
-#endif
/* save source/dest address, mark, hoplimit, flowlabel, priority, */
memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
diff --git a/net/ipv6/netfilter/ip6table_raw.c b/net/ipv6/netfilter/ip6table_raw.c
index 92b9107..4e24ff9 100644
--- a/net/ipv6/netfilter/ip6table_raw.c
+++ b/net/ipv6/netfilter/ip6table_raw.c
@@ -54,6 +54,19 @@ ip6t_hook(unsigned int hook,
return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_raw);
}
+static unsigned int
+ip6t_local_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ /* root is playing with raw sockets. */
+ if (skb->len < sizeof(struct ipv6hdr))
+ return NF_ACCEPT;
+ return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_raw);
+}
+
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6t_hook,
@@ -63,7 +76,7 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
.owner = THIS_MODULE,
},
{
- .hook = ip6t_hook,
+ .hook = ip6t_local_hook,
.pf = PF_INET6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_FIRST,
diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 85050c0..462360e 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -245,11 +245,8 @@ static unsigned int ipv6_conntrack_local(unsigned int hooknum,
int (*okfn)(struct sk_buff *))
{
/* root is playing with raw sockets. */
- if (skb->len < sizeof(struct ipv6hdr)) {
- if (net_ratelimit())
- printk("ipv6_conntrack_local: packet too short\n");
+ if (skb->len < sizeof(struct ipv6hdr))
return NF_ACCEPT;
- }
return ipv6_conntrack_in(hooknum, skb, in, out, okfn);
}
Bests regards,
Jozsef
-
E-mail : kadlec@...ckhole.kfki.hu, kadlec@...l.kfki.hu
PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt
Address : KFKI Research Institute for Particle and Nuclear Physics
H-1525 Budapest 114, POB. 49, Hungary
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