[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 (file)
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -293,6 +293,7 @@ static inline int is_dying(struct ip_conntrack *ct)
 }
 
 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 (file)
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -313,6 +313,7 @@ enum
        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 @@ enum
        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 (file)
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -285,6 +285,7 @@ static inline int nf_ct_is_dying(struct nf_conn *ct)
 }
 
 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 (file)
--- a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -224,7 +224,7 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
        }
 
        /* 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 (file)
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -870,7 +870,7 @@ static int tcp_error(struct sk_buff *skb,
         * 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 (file)
--- a/net/ipv4/netfilter/ip_conntrack_proto_udp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
@@ -120,7 +120,7 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
         * 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 (file)
--- a/net/ipv4/netfilter/ip_conntrack_standalone.c
+++ b/net/ipv4/netfilter/ip_conntrack_standalone.c
@@ -564,6 +564,8 @@ extern unsigned int ip_ct_generic_timeout;
 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[] = {
@@ -591,6 +593,14 @@ static ctl_table ip_ct_sysctl_table[] = {
                .mode           = 0444,
                .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",
@@ -946,6 +956,7 @@ EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 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 (file)
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -235,7 +235,7 @@ icmp_error(struct sk_buff *skb, unsigned int dataoff,
        }
 
        /* 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 (file)
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -233,7 +233,7 @@ icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
                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 (file)
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -828,8 +828,9 @@ static int tcp_error(struct sk_buff *skb,
         * 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 (file)
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -134,7 +134,8 @@ static int udp_error(struct sk_buff *skb, unsigned int dataoff,
         * 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 (file)
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -455,6 +455,8 @@ extern unsigned int nf_ct_generic_timeout;
 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[] = {
@@ -482,6 +484,14 @@ static ctl_table nf_ct_sysctl_table[] = {
                .mode           = 0444,
                .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",
@@ -851,6 +861,7 @@ EXPORT_SYMBOL(nf_ct_proto_put);
 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);