[NETFILTER]: conntrack: add sysctl to disable checksumming
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter_ipv4/ip_conntrack.h b/include/linux/netfilter_ipv4/ip_conntrack.h
index d54d7b2..5473c01 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -293,6 +293,7 @@
}
extern unsigned int ip_conntrack_htable_size;
+extern int ip_conntrack_checksum;
#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index cd9e7c0..98338ed 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -313,6 +313,7 @@
NET_NF_CONNTRACK_FRAG6_TIMEOUT=29,
NET_NF_CONNTRACK_FRAG6_LOW_THRESH=30,
NET_NF_CONNTRACK_FRAG6_HIGH_THRESH=31,
+ NET_NF_CONNTRACK_CHECKSUM=32,
};
/* /proc/sys/net/ipv4 */
@@ -492,6 +493,7 @@
NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
NET_IPV4_NF_CONNTRACK_COUNT=27,
+ NET_IPV4_NF_CONNTRACK_CHECKSUM=28,
};
/* /proc/sys/net/ipv6 */
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 916013c..dbe7a11 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -285,6 +285,7 @@
}
extern unsigned int nf_conntrack_htable_size;
+extern int nf_conntrack_checksum;
#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
index d8b14a9..23f1c50 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -224,7 +224,7 @@
}
/* See ip_conntrack_proto_tcp.c */
- if (hooknum == NF_IP_PRE_ROUTING &&
+ if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, skb->nh.iph->ihl * 4, 0)) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index 062b252..c5c2ce5 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -870,7 +870,7 @@
* and moreover root might send raw packets.
*/
/* FIXME: Source route IP option packets --RR */
- if (hooknum == NF_IP_PRE_ROUTING &&
+ if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_TCP)) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_udp.c b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
index 7089986..9b2c16b 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_udp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
@@ -120,7 +120,7 @@
* because the semantic of CHECKSUM_HW is different there
* and moreover root might send raw packets.
* FIXME: Source route IP option packets --RR */
- if (hooknum == NF_IP_PRE_ROUTING &&
+ if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_UDP)) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
diff --git a/net/ipv4/netfilter/ip_conntrack_standalone.c b/net/ipv4/netfilter/ip_conntrack_standalone.c
index f0cc7fe..6cb9b98 100644
--- a/net/ipv4/netfilter/ip_conntrack_standalone.c
+++ b/net/ipv4/netfilter/ip_conntrack_standalone.c
@@ -564,6 +564,8 @@
static int log_invalid_proto_min = 0;
static int log_invalid_proto_max = 255;
+int ip_conntrack_checksum = 1;
+
static struct ctl_table_header *ip_ct_sysctl_header;
static ctl_table ip_ct_sysctl_table[] = {
@@ -592,6 +594,14 @@
.proc_handler = &proc_dointvec,
},
{
+ .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM,
+ .procname = "ip_conntrack_checksum",
+ .data = &ip_conntrack_checksum,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
.ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
.procname = "ip_conntrack_tcp_timeout_syn_sent",
.data = &ip_ct_tcp_timeout_syn_sent,
@@ -946,6 +956,7 @@
EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
+EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 4b0d361..663a73e 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -235,7 +235,7 @@
}
/* See ip_conntrack_proto_tcp.c */
- if (hooknum == NF_IP_PRE_ROUTING &&
+ if (nf_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, dataoff, 0)) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 86c6703..ef18a7b 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -233,7 +233,7 @@
return -NF_ACCEPT;
}
- if (hooknum == NF_IP6_PRE_ROUTING &&
+ if (nf_conntrack_checksum && hooknum == NF_IP6_PRE_ROUTING &&
nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
"nf_ct_icmpv6: ICMPv6 checksum failed\n");
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 69899f2..12fb7c0 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -828,8 +828,9 @@
* and moreover root might send raw packets.
*/
/* FIXME: Source route IP option packets --RR */
- if (((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
- (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
+ if (nf_conntrack_checksum &&
+ ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
+ (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index d93edbf..ae07ebe 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -134,7 +134,8 @@
* because the semantic of CHECKSUM_HW is different there
* and moreover root might send raw packets.
* FIXME: Source route IP option packets --RR */
- if (((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
+ if (nf_conntrack_checksum &&
+ ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
(pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
if (LOG_INVALID(IPPROTO_UDP))
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 408960c..e01d20d 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -455,6 +455,8 @@
static int log_invalid_proto_min = 0;
static int log_invalid_proto_max = 255;
+int nf_conntrack_checksum = 1;
+
static struct ctl_table_header *nf_ct_sysctl_header;
static ctl_table nf_ct_sysctl_table[] = {
@@ -483,6 +485,14 @@
.proc_handler = &proc_dointvec,
},
{
+ .ctl_name = NET_NF_CONNTRACK_CHECKSUM,
+ .procname = "nf_conntrack_checksum",
+ .data = &nf_conntrack_checksum,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
.procname = "nf_conntrack_tcp_timeout_syn_sent",
.data = &nf_ct_tcp_timeout_syn_sent,
@@ -851,6 +861,7 @@
EXPORT_SYMBOL(nf_ct_l3proto_find_get);
EXPORT_SYMBOL(nf_ct_l3proto_put);
EXPORT_SYMBOL(nf_ct_l3protos);
+EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
EXPORT_SYMBOL(nf_conntrack_expect_alloc);
EXPORT_SYMBOL(nf_conntrack_expect_put);
EXPORT_SYMBOL(nf_conntrack_expect_related);