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[NETFILTER]: Fix invalid module autoloading by splitting iptable_nat 

When you've enabled conntrack and NAT as a module (standard case in all
distributions), and you've also enabled the new conntrack netlink
interface, loading ip_conntrack_netlink.ko will auto-load iptable_nat.ko.
This causes a huge performance penalty, since for every packet you iterate
the nat code, even if you don't want it.

This patch splits iptable_nat.ko into the NAT core (ip_nat.ko) and the
iptables frontend (iptable_nat.ko).  Threfore, ip_conntrack_netlink.ko will
only pull ip_nat.ko, but not the frontend.  ip_nat.ko will "only" allocate
some resources, but not affect runtime performance.

This separation is also a nice step in anticipation of new packet filters
(nf-hipac, ipset, pkttables) being able to use the NAT core.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harald Welte 2005-09-26 15:25:11 -07:00 committed by David S. Miller
parent b85daee0e4
commit 188bab3ae0
5 changed files with 40 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/netfilter_ipv4/ip_nat_core.h
View File

@ -5,16 +5,14 @@
/* This header used to share core functionality between the standalone /* This header used to share core functionality between the standalone
NAT module, and the compatibility layer's use of NAT for masquerading. */ NAT module, and the compatibility layer's use of NAT for masquerading. */
extern int ip_nat_init(void);
extern void ip_nat_cleanup(void);
extern unsigned int nat_packet(struct ip_conntrack *ct, extern unsigned int ip_nat_packet(struct ip_conntrack *ct,
enum ip_conntrack_info conntrackinfo, enum ip_conntrack_info conntrackinfo,
unsigned int hooknum, unsigned int hooknum,
struct sk_buff **pskb); struct sk_buff **pskb);
extern int icmp_reply_translation(struct sk_buff **pskb, extern int ip_nat_icmp_reply_translation(struct sk_buff **pskb,
struct ip_conntrack *ct, struct ip_conntrack *ct,
enum ip_nat_manip_type manip, enum ip_nat_manip_type manip,
enum ip_conntrack_dir dir); enum ip_conntrack_dir dir);
#endif /* _IP_NAT_CORE_H */ #endif /* _IP_NAT_CORE_H */

5
net/ipv4/netfilter/Makefile
View File

@ -4,7 +4,8 @@
# objects for the standalone - connection tracking / NAT # objects for the standalone - connection tracking / NAT
ip_conntrack-objs := ip_conntrack_standalone.o ip_conntrack_core.o ip_conntrack_proto_generic.o ip_conntrack_proto_tcp.o ip_conntrack_proto_udp.o ip_conntrack_proto_icmp.o ip_conntrack-objs := ip_conntrack_standalone.o ip_conntrack_core.o ip_conntrack_proto_generic.o ip_conntrack_proto_tcp.o ip_conntrack_proto_udp.o ip_conntrack_proto_icmp.o
iptable_nat-objs := ip_nat_standalone.o ip_nat_rule.o ip_nat_core.o ip_nat_helper.o ip_nat_proto_unknown.o ip_nat_proto_tcp.o ip_nat_proto_udp.o ip_nat_proto_icmp.o ip_nat-objs := ip_nat_core.o ip_nat_helper.o ip_nat_proto_unknown.o ip_nat_proto_tcp.o ip_nat_proto_udp.o ip_nat_proto_icmp.o
iptable_nat-objs := ip_nat_rule.o ip_nat_standalone.o
ip_conntrack_pptp-objs := ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o ip_conntrack_pptp-objs := ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o
ip_nat_pptp-objs := ip_nat_helper_pptp.o ip_nat_proto_gre.o ip_nat_pptp-objs := ip_nat_helper_pptp.o ip_nat_proto_gre.o
@ -40,7 +41,7 @@ obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
# the three instances of ip_tables # the three instances of ip_tables
obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o ip_nat.o
obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
# matches # matches

35
net/ipv4/netfilter/ip_nat_core.c
View File

@ -74,12 +74,14 @@ ip_nat_proto_find_get(u_int8_t protonum)
return p; return p;
} }
EXPORT_SYMBOL_GPL(ip_nat_proto_find_get);
void void
ip_nat_proto_put(struct ip_nat_protocol *p) ip_nat_proto_put(struct ip_nat_protocol *p)
{ {
module_put(p->me); module_put(p->me);
} }
EXPORT_SYMBOL_GPL(ip_nat_proto_put);
/* We keep an extra hash for each conntrack, for fast searching. */ /* We keep an extra hash for each conntrack, for fast searching. */
static inline unsigned int static inline unsigned int
@ -111,6 +113,7 @@ ip_nat_cheat_check(u_int32_t oldvalinv, u_int32_t newval, u_int16_t oldcheck)
return csum_fold(csum_partial((char *)diffs, sizeof(diffs), return csum_fold(csum_partial((char *)diffs, sizeof(diffs),
oldcheck^0xFFFF)); oldcheck^0xFFFF));
} }
EXPORT_SYMBOL(ip_nat_cheat_check);
/* Is this tuple already taken? (not by us) */ /* Is this tuple already taken? (not by us) */
int int
@ -127,6 +130,7 @@ ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
invert_tuplepr(&reply, tuple); invert_tuplepr(&reply, tuple);
return ip_conntrack_tuple_taken(&reply, ignored_conntrack); return ip_conntrack_tuple_taken(&reply, ignored_conntrack);
} }
EXPORT_SYMBOL(ip_nat_used_tuple);
/* If we source map this tuple so reply looks like reply_tuple, will /* If we source map this tuple so reply looks like reply_tuple, will
* that meet the constraints of range. */ * that meet the constraints of range. */
@ -347,6 +351,7 @@ ip_nat_setup_info(struct ip_conntrack *conntrack,
return NF_ACCEPT; return NF_ACCEPT;
} }
EXPORT_SYMBOL(ip_nat_setup_info);
/* Returns true if succeeded. */ /* Returns true if succeeded. */
static int static int
@ -387,10 +392,10 @@ manip_pkt(u_int16_t proto,
} }
/* Do packet manipulations according to ip_nat_setup_info. */ /* Do packet manipulations according to ip_nat_setup_info. */
unsigned int nat_packet(struct ip_conntrack *ct, unsigned int ip_nat_packet(struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo, enum ip_conntrack_info ctinfo,
unsigned int hooknum, unsigned int hooknum,
struct sk_buff **pskb) struct sk_buff **pskb)
{ {
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned long statusbit; unsigned long statusbit;
@ -417,12 +422,13 @@ unsigned int nat_packet(struct ip_conntrack *ct,
} }
return NF_ACCEPT; return NF_ACCEPT;
} }
EXPORT_SYMBOL_GPL(ip_nat_packet);
/* Dir is direction ICMP is coming from (opposite to packet it contains) */ /* Dir is direction ICMP is coming from (opposite to packet it contains) */
int icmp_reply_translation(struct sk_buff **pskb, int ip_nat_icmp_reply_translation(struct sk_buff **pskb,
struct ip_conntrack *ct, struct ip_conntrack *ct,
enum ip_nat_manip_type manip, enum ip_nat_manip_type manip,
enum ip_conntrack_dir dir) enum ip_conntrack_dir dir)
{ {
struct { struct {
struct icmphdr icmp; struct icmphdr icmp;
@ -509,6 +515,7 @@ int icmp_reply_translation(struct sk_buff **pskb,
return 1; return 1;
} }
EXPORT_SYMBOL_GPL(ip_nat_icmp_reply_translation);
/* Protocol registration. */ /* Protocol registration. */
int ip_nat_protocol_register(struct ip_nat_protocol *proto) int ip_nat_protocol_register(struct ip_nat_protocol *proto)
@ -525,6 +532,7 @@ int ip_nat_protocol_register(struct ip_nat_protocol *proto)
write_unlock_bh(&ip_nat_lock); write_unlock_bh(&ip_nat_lock);
return ret; return ret;
} }
EXPORT_SYMBOL(ip_nat_protocol_register);
/* Noone stores the protocol anywhere; simply delete it. */ /* Noone stores the protocol anywhere; simply delete it. */
void ip_nat_protocol_unregister(struct ip_nat_protocol *proto) void ip_nat_protocol_unregister(struct ip_nat_protocol *proto)
@ -536,6 +544,7 @@ void ip_nat_protocol_unregister(struct ip_nat_protocol *proto)
/* Someone could be still looking at the proto in a bh. */ /* Someone could be still looking at the proto in a bh. */
synchronize_net(); synchronize_net();
} }
EXPORT_SYMBOL(ip_nat_protocol_unregister);
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \ #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE) defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
@ -582,7 +591,7 @@ EXPORT_SYMBOL_GPL(ip_nat_port_nfattr_to_range);
EXPORT_SYMBOL_GPL(ip_nat_port_range_to_nfattr); EXPORT_SYMBOL_GPL(ip_nat_port_range_to_nfattr);
#endif #endif
int __init ip_nat_init(void) static int __init ip_nat_init(void)
{ {
size_t i; size_t i;
@ -624,10 +633,14 @@ static int clean_nat(struct ip_conntrack *i, void *data)
return 0; return 0;
} }
/* Not __exit: called from ip_nat_standalone.c:init_or_cleanup() --RR */ static void __exit ip_nat_cleanup(void)
void ip_nat_cleanup(void)
{ {
ip_ct_iterate_cleanup(&clean_nat, NULL); ip_ct_iterate_cleanup(&clean_nat, NULL);
ip_conntrack_destroyed = NULL; ip_conntrack_destroyed = NULL;
vfree(bysource); vfree(bysource);
} }
MODULE_LICENSE("GPL");
module_init(ip_nat_init);
module_exit(ip_nat_cleanup);

4
net/ipv4/netfilter/ip_nat_helper.c
View File

@ -199,6 +199,7 @@ ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
} }
return 1; return 1;
} }
EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
/* Generic function for mangling variable-length address changes inside /* Generic function for mangling variable-length address changes inside
* NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX
@ -256,6 +257,7 @@ ip_nat_mangle_udp_packet(struct sk_buff **pskb,
return 1; return 1;
} }
EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
/* Adjust one found SACK option including checksum correction */ /* Adjust one found SACK option including checksum correction */
static void static void
@ -399,6 +401,7 @@ ip_nat_seq_adjust(struct sk_buff **pskb,
return 1; return 1;
} }
EXPORT_SYMBOL(ip_nat_seq_adjust);
/* Setup NAT on this expected conntrack so it follows master. */ /* Setup NAT on this expected conntrack so it follows master. */
/* If we fail to get a free NAT slot, we'll get dropped on confirm */ /* If we fail to get a free NAT slot, we'll get dropped on confirm */
@ -425,3 +428,4 @@ void ip_nat_follow_master(struct ip_conntrack *ct,
/* hook doesn't matter, but it has to do destination manip */ /* hook doesn't matter, but it has to do destination manip */
ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING); ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
} }
EXPORT_SYMBOL(ip_nat_follow_master);

25
net/ipv4/netfilter/ip_nat_standalone.c
View File

@ -108,8 +108,8 @@ ip_nat_fn(unsigned int hooknum,
case IP_CT_RELATED: case IP_CT_RELATED:
case IP_CT_RELATED+IP_CT_IS_REPLY: case IP_CT_RELATED+IP_CT_IS_REPLY:
if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) { if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
if (!icmp_reply_translation(pskb, ct, maniptype, if (!ip_nat_icmp_reply_translation(pskb, ct, maniptype,
CTINFO2DIR(ctinfo))) CTINFO2DIR(ctinfo)))
return NF_DROP; return NF_DROP;
else else
return NF_ACCEPT; return NF_ACCEPT;
@ -152,7 +152,7 @@ ip_nat_fn(unsigned int hooknum,
} }
IP_NF_ASSERT(info); IP_NF_ASSERT(info);
return nat_packet(ct, ctinfo, hooknum, pskb); return ip_nat_packet(ct, ctinfo, hooknum, pskb);
} }
static unsigned int static unsigned int
@ -325,15 +325,10 @@ static int init_or_cleanup(int init)
printk("ip_nat_init: can't setup rules.\n"); printk("ip_nat_init: can't setup rules.\n");
goto cleanup_nothing; goto cleanup_nothing;
} }
ret = ip_nat_init();
if (ret < 0) {
printk("ip_nat_init: can't setup rules.\n");
goto cleanup_rule_init;
}
ret = nf_register_hook(&ip_nat_in_ops); ret = nf_register_hook(&ip_nat_in_ops);
if (ret < 0) { if (ret < 0) {
printk("ip_nat_init: can't register in hook.\n"); printk("ip_nat_init: can't register in hook.\n");
goto cleanup_nat; goto cleanup_rule_init;
} }
ret = nf_register_hook(&ip_nat_out_ops); ret = nf_register_hook(&ip_nat_out_ops);
if (ret < 0) { if (ret < 0) {
@ -374,8 +369,6 @@ static int init_or_cleanup(int init)
nf_unregister_hook(&ip_nat_out_ops); nf_unregister_hook(&ip_nat_out_ops);
cleanup_inops: cleanup_inops:
nf_unregister_hook(&ip_nat_in_ops); nf_unregister_hook(&ip_nat_in_ops);
cleanup_nat:
ip_nat_cleanup();
cleanup_rule_init: cleanup_rule_init:
ip_nat_rule_cleanup(); ip_nat_rule_cleanup();
cleanup_nothing: cleanup_nothing:
@ -395,14 +388,4 @@ static void __exit fini(void)
module_init(init); module_init(init);
module_exit(fini); module_exit(fini);
EXPORT_SYMBOL(ip_nat_setup_info);
EXPORT_SYMBOL(ip_nat_protocol_register);
EXPORT_SYMBOL(ip_nat_protocol_unregister);
EXPORT_SYMBOL_GPL(ip_nat_proto_find_get);
EXPORT_SYMBOL_GPL(ip_nat_proto_put);
EXPORT_SYMBOL(ip_nat_cheat_check);
EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
EXPORT_SYMBOL(ip_nat_used_tuple);
EXPORT_SYMBOL(ip_nat_follow_master);
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");