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authorPatrick McHardy <kaber@trash.net>2006-03-20 21:03:40 -0500
committerDavid S. Miller <davem@davemloft.net>2006-03-20 21:03:40 -0500
commitc4b885139203d37f76662c37ae645fe8e0f4e4e5 (patch)
tree5cedf4d632b273df81bf1712b95dbc8b96cdc0e4 /net
parentf2ffd9eeda82b476c034d733be08ecf6a87d2edf (diff)
[NETFILTER]: x_tables: replace IPv4/IPv6 policy match by address family independant version
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/Kconfig10
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/ipv4/netfilter/ipt_policy.c174
-rw-r--r--net/ipv6/netfilter/Kconfig10
-rw-r--r--net/ipv6/netfilter/Makefile1
-rw-r--r--net/ipv6/netfilter/ip6t_policy.c174
-rw-r--r--net/netfilter/Kconfig10
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/xt_policy.c209
9 files changed, 220 insertions, 370 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index db783036e4d8..933ee7a9efdf 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -303,16 +303,6 @@ config IP_NF_MATCH_HASHLIMIT
303 destination IP' or `500pps from any given source IP' with a single 303 destination IP' or `500pps from any given source IP' with a single
304 IPtables rule. 304 IPtables rule.
305 305
306config IP_NF_MATCH_POLICY
307 tristate "IPsec policy match support"
308 depends on IP_NF_IPTABLES && XFRM
309 help
310 Policy matching allows you to match packets based on the
311 IPsec policy that was used during decapsulation/will
312 be used during encapsulation.
313
314 To compile it as a module, choose M here. If unsure, say N.
315
316# `filter', generic and specific targets 306# `filter', generic and specific targets
317config IP_NF_FILTER 307config IP_NF_FILTER
318 tristate "Packet filtering" 308 tristate "Packet filtering"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index e5c5b3202f02..3fe80924ac54 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -57,7 +57,6 @@ obj-$(CONFIG_IP_NF_MATCH_DSCP) += ipt_dscp.o
57obj-$(CONFIG_IP_NF_MATCH_AH_ESP) += ipt_ah.o ipt_esp.o 57obj-$(CONFIG_IP_NF_MATCH_AH_ESP) += ipt_ah.o ipt_esp.o
58obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o 58obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
59obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o 59obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
60obj-$(CONFIG_IP_NF_MATCH_POLICY) += ipt_policy.o
61 60
62# targets 61# targets
63obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o 62obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
diff --git a/net/ipv4/netfilter/ipt_policy.c b/net/ipv4/netfilter/ipt_policy.c
deleted file mode 100644
index b73f590b226b..000000000000
--- a/net/ipv4/netfilter/ipt_policy.c
+++ /dev/null
@@ -1,174 +0,0 @@
1/* IP tables module for matching IPsec policy
2 *
3 * Copyright (c) 2004,2005 Patrick McHardy, <kaber@trash.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
11#include <linux/config.h>
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <net/xfrm.h>
16
17#include <linux/netfilter_ipv4.h>
18#include <linux/netfilter_ipv4/ip_tables.h>
19#include <linux/netfilter_ipv4/ipt_policy.h>
20
21MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
22MODULE_DESCRIPTION("IPtables IPsec policy matching module");
23MODULE_LICENSE("GPL");
24
25
26static inline int
27match_xfrm_state(struct xfrm_state *x, const struct ipt_policy_elem *e)
28{
29#define MATCH_ADDR(x,y,z) (!e->match.x || \
30 ((e->x.a4.s_addr == (e->y.a4.s_addr & (z))) \
31 ^ e->invert.x))
32#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
33
34 return MATCH_ADDR(saddr, smask, x->props.saddr.a4) &&
35 MATCH_ADDR(daddr, dmask, x->id.daddr.a4) &&
36 MATCH(proto, x->id.proto) &&
37 MATCH(mode, x->props.mode) &&
38 MATCH(spi, x->id.spi) &&
39 MATCH(reqid, x->props.reqid);
40}
41
42static int
43match_policy_in(const struct sk_buff *skb, const struct ipt_policy_info *info)
44{
45 const struct ipt_policy_elem *e;
46 struct sec_path *sp = skb->sp;
47 int strict = info->flags & IPT_POLICY_MATCH_STRICT;
48 int i, pos;
49
50 if (sp == NULL)
51 return -1;
52 if (strict && info->len != sp->len)
53 return 0;
54
55 for (i = sp->len - 1; i >= 0; i--) {
56 pos = strict ? i - sp->len + 1 : 0;
57 if (pos >= info->len)
58 return 0;
59 e = &info->pol[pos];
60
61 if (match_xfrm_state(sp->x[i].xvec, e)) {
62 if (!strict)
63 return 1;
64 } else if (strict)
65 return 0;
66 }
67
68 return strict ? 1 : 0;
69}
70
71static int
72match_policy_out(const struct sk_buff *skb, const struct ipt_policy_info *info)
73{
74 const struct ipt_policy_elem *e;
75 struct dst_entry *dst = skb->dst;
76 int strict = info->flags & IPT_POLICY_MATCH_STRICT;
77 int i, pos;
78
79 if (dst->xfrm == NULL)
80 return -1;
81
82 for (i = 0; dst && dst->xfrm; dst = dst->child, i++) {
83 pos = strict ? i : 0;
84 if (pos >= info->len)
85 return 0;
86 e = &info->pol[pos];
87
88 if (match_xfrm_state(dst->xfrm, e)) {
89 if (!strict)
90 return 1;
91 } else if (strict)
92 return 0;
93 }
94
95 return strict ? i == info->len : 0;
96}
97
98static int match(const struct sk_buff *skb,
99 const struct net_device *in,
100 const struct net_device *out,
101 const struct xt_match *match,
102 const void *matchinfo,
103 int offset,
104 unsigned int protoff,
105 int *hotdrop)
106{
107 const struct ipt_policy_info *info = matchinfo;
108 int ret;
109
110 if (info->flags & IPT_POLICY_MATCH_IN)
111 ret = match_policy_in(skb, info);
112 else
113 ret = match_policy_out(skb, info);
114
115 if (ret < 0)
116 ret = info->flags & IPT_POLICY_MATCH_NONE ? 1 : 0;
117 else if (info->flags & IPT_POLICY_MATCH_NONE)
118 ret = 0;
119
120 return ret;
121}
122
123static int checkentry(const char *tablename, const void *ip_void,
124 const struct xt_match *match,
125 void *matchinfo, unsigned int matchsize,
126 unsigned int hook_mask)
127{
128 struct ipt_policy_info *info = matchinfo;
129
130 if (!(info->flags & (IPT_POLICY_MATCH_IN|IPT_POLICY_MATCH_OUT))) {
131 printk(KERN_ERR "ipt_policy: neither incoming nor "
132 "outgoing policy selected\n");
133 return 0;
134 }
135 if (hook_mask & (1 << NF_IP_PRE_ROUTING | 1 << NF_IP_LOCAL_IN)
136 && info->flags & IPT_POLICY_MATCH_OUT) {
137 printk(KERN_ERR "ipt_policy: output policy not valid in "
138 "PRE_ROUTING and INPUT\n");
139 return 0;
140 }
141 if (hook_mask & (1 << NF_IP_POST_ROUTING | 1 << NF_IP_LOCAL_OUT)
142 && info->flags & IPT_POLICY_MATCH_IN) {
143 printk(KERN_ERR "ipt_policy: input policy not valid in "
144 "POST_ROUTING and OUTPUT\n");
145 return 0;
146 }
147 if (info->len > IPT_POLICY_MAX_ELEM) {
148 printk(KERN_ERR "ipt_policy: too many policy elements\n");
149 return 0;
150 }
151
152 return 1;
153}
154
155static struct ipt_match policy_match = {
156 .name = "policy",
157 .match = match,
158 .matchsize = sizeof(struct ipt_policy_info),
159 .checkentry = checkentry,
160 .me = THIS_MODULE,
161};
162
163static int __init init(void)
164{
165 return ipt_register_match(&policy_match);
166}
167
168static void __exit fini(void)
169{
170 ipt_unregister_match(&policy_match);
171}
172
173module_init(init);
174module_exit(fini);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 2d6f8ecbc27b..98f78759f1ab 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -133,16 +133,6 @@ config IP6_NF_MATCH_EUI64
133 133
134 To compile it as a module, choose M here. If unsure, say N. 134 To compile it as a module, choose M here. If unsure, say N.
135 135
136config IP6_NF_MATCH_POLICY
137 tristate "IPsec policy match support"
138 depends on IP6_NF_IPTABLES && XFRM
139 help
140 Policy matching allows you to match packets based on the
141 IPsec policy that was used during decapsulation/will
142 be used during encapsulation.
143
144 To compile it as a module, choose M here. If unsure, say N.
145
146# The targets 136# The targets
147config IP6_NF_FILTER 137config IP6_NF_FILTER
148 tristate "Packet filtering" 138 tristate "Packet filtering"
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index db6073c94163..8436a1a1731f 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -9,7 +9,6 @@ obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o ip6t_dst.o
9obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o 9obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
10obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o 10obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o
11obj-$(CONFIG_IP6_NF_MATCH_AHESP) += ip6t_esp.o ip6t_ah.o 11obj-$(CONFIG_IP6_NF_MATCH_AHESP) += ip6t_esp.o ip6t_ah.o
12obj-$(CONFIG_IP6_NF_MATCH_POLICY) += ip6t_policy.o
13obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o 12obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
14obj-$(CONFIG_IP6_NF_MATCH_MULTIPORT) += ip6t_multiport.o 13obj-$(CONFIG_IP6_NF_MATCH_MULTIPORT) += ip6t_multiport.o
15obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o 14obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o
diff --git a/net/ipv6/netfilter/ip6t_policy.c b/net/ipv6/netfilter/ip6t_policy.c
deleted file mode 100644
index f2a59970e007..000000000000
--- a/net/ipv6/netfilter/ip6t_policy.c
+++ /dev/null
@@ -1,174 +0,0 @@
1/* IP tables module for matching IPsec policy
2 *
3 * Copyright (c) 2004,2005 Patrick McHardy, <kaber@trash.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
11#include <linux/config.h>
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <net/xfrm.h>
16
17#include <linux/netfilter_ipv6.h>
18#include <linux/netfilter_ipv6/ip6_tables.h>
19#include <linux/netfilter_ipv6/ip6t_policy.h>
20
21MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
22MODULE_DESCRIPTION("IPtables IPsec policy matching module");
23MODULE_LICENSE("GPL");
24
25
26static inline int
27match_xfrm_state(struct xfrm_state *x, const struct ip6t_policy_elem *e)
28{
29#define MATCH_ADDR(x,y,z) (!e->match.x || \
30 ((!ipv6_masked_addr_cmp(&e->x.a6, &e->y.a6, \
31 z)) \
32 ^ e->invert.x))
33#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
34
35 return MATCH_ADDR(saddr, smask, (struct in6_addr *)&x->props.saddr.a6) &&
36 MATCH_ADDR(daddr, dmask, (struct in6_addr *)&x->id.daddr.a6) &&
37 MATCH(proto, x->id.proto) &&
38 MATCH(mode, x->props.mode) &&
39 MATCH(spi, x->id.spi) &&
40 MATCH(reqid, x->props.reqid);
41}
42
43static int
44match_policy_in(const struct sk_buff *skb, const struct ip6t_policy_info *info)
45{
46 const struct ip6t_policy_elem *e;
47 struct sec_path *sp = skb->sp;
48 int strict = info->flags & IP6T_POLICY_MATCH_STRICT;
49 int i, pos;
50
51 if (sp == NULL)
52 return -1;
53 if (strict && info->len != sp->len)
54 return 0;
55
56 for (i = sp->len - 1; i >= 0; i--) {
57 pos = strict ? i - sp->len + 1 : 0;
58 if (pos >= info->len)
59 return 0;
60 e = &info->pol[pos];
61
62 if (match_xfrm_state(sp->x[i].xvec, e)) {
63 if (!strict)
64 return 1;
65 } else if (strict)
66 return 0;
67 }
68
69 return strict ? 1 : 0;
70}
71
72static int
73match_policy_out(const struct sk_buff *skb, const struct ip6t_policy_info *info)
74{
75 const struct ip6t_policy_elem *e;
76 struct dst_entry *dst = skb->dst;
77 int strict = info->flags & IP6T_POLICY_MATCH_STRICT;
78 int i, pos;
79
80 if (dst->xfrm == NULL)
81 return -1;
82
83 for (i = 0; dst && dst->xfrm; dst = dst->child, i++) {
84 pos = strict ? i : 0;
85 if (pos >= info->len)
86 return 0;
87 e = &info->pol[pos];
88
89 if (match_xfrm_state(dst->xfrm, e)) {
90 if (!strict)
91 return 1;
92 } else if (strict)
93 return 0;
94 }
95
96 return strict ? i == info->len : 0;
97}
98
99static int match(const struct sk_buff *skb,
100 const struct net_device *in,
101 const struct net_device *out,
102 const struct xt_match *match,
103 const void *matchinfo,
104 int offset,
105 unsigned int protoff,
106 int *hotdrop)
107{
108 const struct ip6t_policy_info *info = matchinfo;
109 int ret;
110
111 if (info->flags & IP6T_POLICY_MATCH_IN)
112 ret = match_policy_in(skb, info);
113 else
114 ret = match_policy_out(skb, info);
115
116 if (ret < 0)
117 ret = info->flags & IP6T_POLICY_MATCH_NONE ? 1 : 0;
118 else if (info->flags & IP6T_POLICY_MATCH_NONE)
119 ret = 0;
120
121 return ret;
122}
123
124static int checkentry(const char *tablename, const void *ip_void,
125 const struct xt_match *match, void *matchinfo,
126 unsigned int matchsize, unsigned int hook_mask)
127{
128 struct ip6t_policy_info *info = matchinfo;
129
130 if (!(info->flags & (IP6T_POLICY_MATCH_IN|IP6T_POLICY_MATCH_OUT))) {
131 printk(KERN_ERR "ip6t_policy: neither incoming nor "
132 "outgoing policy selected\n");
133 return 0;
134 }
135 if (hook_mask & (1 << NF_IP6_PRE_ROUTING | 1 << NF_IP6_LOCAL_IN)
136 && info->flags & IP6T_POLICY_MATCH_OUT) {
137 printk(KERN_ERR "ip6t_policy: output policy not valid in "
138 "PRE_ROUTING and INPUT\n");
139 return 0;
140 }
141 if (hook_mask & (1 << NF_IP6_POST_ROUTING | 1 << NF_IP6_LOCAL_OUT)
142 && info->flags & IP6T_POLICY_MATCH_IN) {
143 printk(KERN_ERR "ip6t_policy: input policy not valid in "
144 "POST_ROUTING and OUTPUT\n");
145 return 0;
146 }
147 if (info->len > IP6T_POLICY_MAX_ELEM) {
148 printk(KERN_ERR "ip6t_policy: too many policy elements\n");
149 return 0;
150 }
151
152 return 1;
153}
154
155static struct ip6t_match policy_match = {
156 .name = "policy",
157 .match = match,
158 .matchsize = sizeof(struct ip6t_policy_info),
159 .checkentry = checkentry,
160 .me = THIS_MODULE,
161};
162
163static int __init init(void)
164{
165 return ip6t_register_match(&policy_match);
166}
167
168static void __exit fini(void)
169{
170 ip6t_unregister_match(&policy_match);
171}
172
173module_init(init);
174module_exit(fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index a8e5544da93e..174027809148 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -279,6 +279,16 @@ config NETFILTER_XT_MATCH_MARK
279 279
280 To compile it as a module, choose M here. If unsure, say N. 280 To compile it as a module, choose M here. If unsure, say N.
281 281
282config NETFILTER_XT_MATCH_POLICY
283 tristate 'IPsec "policy" match support'
284 depends on NETFILTER_XTABLES && XFRM
285 help
286 Policy matching allows you to match packets based on the
287 IPsec policy that was used during decapsulation/will
288 be used during encapsulation.
289
290 To compile it as a module, choose M here. If unsure, say N.
291
282config NETFILTER_XT_MATCH_PHYSDEV 292config NETFILTER_XT_MATCH_PHYSDEV
283 tristate '"physdev" match support' 293 tristate '"physdev" match support'
284 depends on NETFILTER_XTABLES && BRIDGE_NETFILTER 294 depends on NETFILTER_XTABLES && BRIDGE_NETFILTER
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 746172ebc91b..9558727f5e79 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
40obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o 40obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
41obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o 41obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o
42obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o 42obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o
43obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
43obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o 44obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
44obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o 45obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
45obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o 46obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
diff --git a/net/netfilter/xt_policy.c b/net/netfilter/xt_policy.c
new file mode 100644
index 000000000000..1ec22082f04d
--- /dev/null
+++ b/net/netfilter/xt_policy.c
@@ -0,0 +1,209 @@
1/* IP tables module for matching IPsec policy
2 *
3 * Copyright (c) 2004,2005 Patrick McHardy, <kaber@trash.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
11#include <linux/config.h>
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <net/xfrm.h>
16
17#include <linux/netfilter/xt_policy.h>
18#include <linux/netfilter/x_tables.h>
19
20MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
21MODULE_DESCRIPTION("Xtables IPsec policy matching module");
22MODULE_LICENSE("GPL");
23
24static inline int
25xt_addr_cmp(const union xt_policy_addr *a1, const union xt_policy_addr *m,
26 const union xt_policy_addr *a2, unsigned short family)
27{
28 switch (family) {
29 case AF_INET:
30 return (a1->a4.s_addr ^ a2->a4.s_addr) & m->a4.s_addr;
31 case AF_INET6:
32 return ipv6_masked_addr_cmp(&a1->a6, &m->a6, &a2->a6);
33 }
34 return 0;
35}
36
37static inline int
38match_xfrm_state(struct xfrm_state *x, const struct xt_policy_elem *e,
39 unsigned short family)
40{
41#define MATCH_ADDR(x,y,z) (!e->match.x || \
42 (xt_addr_cmp(&e->x, &e->y, z, family) \
43 ^ e->invert.x))
44#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
45
46 return MATCH_ADDR(saddr, smask, (union xt_policy_addr *)&x->props.saddr) &&
47 MATCH_ADDR(daddr, dmask, (union xt_policy_addr *)&x->id.daddr.a4) &&
48 MATCH(proto, x->id.proto) &&
49 MATCH(mode, x->props.mode) &&
50 MATCH(spi, x->id.spi) &&
51 MATCH(reqid, x->props.reqid);
52}
53
54static int
55match_policy_in(const struct sk_buff *skb, const struct xt_policy_info *info,
56 unsigned short family)
57{
58 const struct xt_policy_elem *e;
59 struct sec_path *sp = skb->sp;
60 int strict = info->flags & XT_POLICY_MATCH_STRICT;
61 int i, pos;
62
63 if (sp == NULL)
64 return -1;
65 if (strict && info->len != sp->len)
66 return 0;
67
68 for (i = sp->len - 1; i >= 0; i--) {
69 pos = strict ? i - sp->len + 1 : 0;
70 if (pos >= info->len)
71 return 0;
72 e = &info->pol[pos];
73
74 if (match_xfrm_state(sp->x[i].xvec, e, family)) {
75 if (!strict)
76 return 1;
77 } else if (strict)
78 return 0;
79 }
80
81 return strict ? 1 : 0;
82}
83
84static int
85match_policy_out(const struct sk_buff *skb, const struct xt_policy_info *info,
86 unsigned short family)
87{
88 const struct xt_policy_elem *e;
89 struct dst_entry *dst = skb->dst;
90 int strict = info->flags & XT_POLICY_MATCH_STRICT;
91 int i, pos;
92
93 if (dst->xfrm == NULL)
94 return -1;
95
96 for (i = 0; dst && dst->xfrm; dst = dst->child, i++) {
97 pos = strict ? i : 0;
98 if (pos >= info->len)
99 return 0;
100 e = &info->pol[pos];
101
102 if (match_xfrm_state(dst->xfrm, e, family)) {
103 if (!strict)
104 return 1;
105 } else if (strict)
106 return 0;
107 }
108
109 return strict ? i == info->len : 0;
110}
111
112static int match(const struct sk_buff *skb,
113 const struct net_device *in,
114 const struct net_device *out,
115 const struct xt_match *match,
116 const void *matchinfo,
117 int offset,
118 unsigned int protoff,
119 int *hotdrop)
120{
121 const struct xt_policy_info *info = matchinfo;
122 int ret;
123
124 if (info->flags & XT_POLICY_MATCH_IN)
125 ret = match_policy_in(skb, info, match->family);
126 else
127 ret = match_policy_out(skb, info, match->family);
128
129 if (ret < 0)
130 ret = info->flags & XT_POLICY_MATCH_NONE ? 1 : 0;
131 else if (info->flags & XT_POLICY_MATCH_NONE)
132 ret = 0;
133
134 return ret;
135}
136
137static int checkentry(const char *tablename, const void *ip_void,
138 const struct xt_match *match,
139 void *matchinfo, unsigned int matchsize,
140 unsigned int hook_mask)
141{
142 struct xt_policy_info *info = matchinfo;
143
144 if (!(info->flags & (XT_POLICY_MATCH_IN|XT_POLICY_MATCH_OUT))) {
145 printk(KERN_ERR "xt_policy: neither incoming nor "
146 "outgoing policy selected\n");
147 return 0;
148 }
149 /* hook values are equal for IPv4 and IPv6 */
150 if (hook_mask & (1 << NF_IP_PRE_ROUTING | 1 << NF_IP_LOCAL_IN)
151 && info->flags & XT_POLICY_MATCH_OUT) {
152 printk(KERN_ERR "xt_policy: output policy not valid in "
153 "PRE_ROUTING and INPUT\n");
154 return 0;
155 }
156 if (hook_mask & (1 << NF_IP_POST_ROUTING | 1 << NF_IP_LOCAL_OUT)
157 && info->flags & XT_POLICY_MATCH_IN) {
158 printk(KERN_ERR "xt_policy: input policy not valid in "
159 "POST_ROUTING and OUTPUT\n");
160 return 0;
161 }
162 if (info->len > XT_POLICY_MAX_ELEM) {
163 printk(KERN_ERR "xt_policy: too many policy elements\n");
164 return 0;
165 }
166 return 1;
167}
168
169static struct xt_match policy_match = {
170 .name = "policy",
171 .family = AF_INET,
172 .match = match,
173 .matchsize = sizeof(struct xt_policy_info),
174 .checkentry = checkentry,
175 .me = THIS_MODULE,
176};
177
178static struct xt_match policy6_match = {
179 .name = "policy",
180 .family = AF_INET6,
181 .match = match,
182 .matchsize = sizeof(struct xt_policy_info),
183 .checkentry = checkentry,
184 .me = THIS_MODULE,
185};
186
187static int __init init(void)
188{
189 int ret;
190
191 ret = xt_register_match(AF_INET, &policy_match);
192 if (ret)
193 return ret;
194 ret = xt_register_match(AF_INET6, &policy6_match);
195 if (ret)
196 xt_unregister_match(AF_INET, &policy_match);
197 return ret;
198}
199
200static void __exit fini(void)
201{
202 xt_unregister_match(AF_INET6, &policy6_match);
203 xt_unregister_match(AF_INET, &policy_match);
204}
205
206module_init(init);
207module_exit(fini);
208MODULE_ALIAS("ipt_policy");
209MODULE_ALIAS("ip6t_policy");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 09:17:53 -0500