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[NETFILTER]: Prepare {ipt,ip6t}_policy match for x_tables unification 

The IPv4 and IPv6 version of the policy match are identical besides address
comparison and the data structure used for userspace communication. Unify
the data structures to break compatiblity now (before it is released), so
we can port it to x_tables in 2.6.17.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-02-04 02:19:09 -08:00 committed by David S. Miller
parent 878c41ce57
commit 0047c65a60
4 changed files with 36 additions and 21 deletions
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22
include/linux/netfilter_ipv4/ipt_policy.h
View File

@ -27,16 +27,22 @@ struct ipt_policy_spec
reqid:1;
};
union ipt_policy_addr
{
struct in_addr a4;
struct in6_addr a6;
};
struct ipt_policy_elem
{
u_int32_t saddr;
u_int32_t smask;
u_int32_t daddr;
u_int32_t dmask;
u_int32_t spi;
u_int32_t reqid;
u_int8_t proto;
u_int8_t mode;
union ipt_policy_addr saddr;
union ipt_policy_addr smask;
union ipt_policy_addr daddr;
union ipt_policy_addr dmask;
u_int32_t spi;
u_int32_t reqid;
u_int8_t proto;
u_int8_t mode;
struct ipt_policy_spec match;
struct ipt_policy_spec invert;

22
include/linux/netfilter_ipv6/ip6t_policy.h
View File

@ -27,16 +27,22 @@ struct ip6t_policy_spec
reqid:1;
};
union ip6t_policy_addr
{
struct in_addr a4;
struct in6_addr a6;
};
struct ip6t_policy_elem
{
struct in6_addr saddr;
struct in6_addr smask;
struct in6_addr daddr;
struct in6_addr dmask;
u_int32_t spi;
u_int32_t reqid;
u_int8_t proto;
u_int8_t mode;
union ip6t_policy_addr saddr;
union ip6t_policy_addr smask;
union ip6t_policy_addr daddr;
union ip6t_policy_addr dmask;
u_int32_t spi;
u_int32_t reqid;
u_int8_t proto;
u_int8_t mode;
struct ip6t_policy_spec match;
struct ip6t_policy_spec invert;

9
net/ipv4/netfilter/ipt_policy.c
View File

@ -26,10 +26,13 @@ MODULE_LICENSE("GPL");
static inline int
match_xfrm_state(struct xfrm_state *x, const struct ipt_policy_elem *e)
{
#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
#define MATCH_ADDR(x,y,z) (!e->match.x || \
((e->x.a4.s_addr == (e->y.a4.s_addr & (z))) \
^ e->invert.x))
#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
return MATCH(saddr, x->props.saddr.a4 & e->smask) &&
MATCH(daddr, x->id.daddr.a4 & e->dmask) &&
return MATCH_ADDR(saddr, smask, x->props.saddr.a4) &&
MATCH_ADDR(daddr, dmask, x->id.daddr.a4) &&
MATCH(proto, x->id.proto) &&
MATCH(mode, x->props.mode) &&
MATCH(spi, x->id.spi) &&

4
net/ipv6/netfilter/ip6t_policy.c
View File

@ -26,8 +26,8 @@ MODULE_LICENSE("GPL");
static inline int
match_xfrm_state(struct xfrm_state *x, const struct ip6t_policy_elem *e)
{
#define MATCH_ADDR(x,y,z) (!e->match.x || \
((!ip6_masked_addrcmp(&e->x, &e->y, z)) \
#define MATCH_ADDR(x,y,z) (!e->match.x || \
((!ip6_masked_addrcmp(&e->x.a6, &e->y.a6, z)) \
^ e->invert.x))
#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))