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authorPatrick McHardy <kaber@trash.net>2006-08-22 03:43:55 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 17:55:37 -0400
commit5fa2a7601f994bdd034e871b7ea1abd6969fbb6c (patch)
tree79c5294c070494498728f7f36f1ea424bf52ad8f /net
parent91270cf81765152f6e77953440beb4d3b34a71b5 (diff)
[NETFILTER]: ip6_tables: consolidate dst and hbh matches
The matches are identical besides one looking for NEXTHDR_HOP, the other for NEXTHDR_DEST. Remove ip6t_dst.c and handle both in ip6t_hbh.c. 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/ipv6/netfilter/Makefile2
-rw-r--r--net/ipv6/netfilter/ip6t_dst.c219
-rw-r--r--net/ipv6/netfilter/ip6t_hbh.c48
3 files changed, 25 insertions, 244 deletions
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index eeeb57d4c9c5..ac1dfebde175 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -5,7 +5,7 @@
5# Link order matters here. 5# Link order matters here.
6obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o 6obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o
7obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o 7obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
8obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o ip6t_dst.o 8obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.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-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o 11obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
diff --git a/net/ipv6/netfilter/ip6t_dst.c b/net/ipv6/netfilter/ip6t_dst.c
deleted file mode 100644
index 223c335467cc..000000000000
--- a/net/ipv6/netfilter/ip6t_dst.c
+++ /dev/null
@@ -1,219 +0,0 @@
1/* Kernel module to match Hop-by-Hop and Destination parameters. */
2
3/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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/module.h>
11#include <linux/skbuff.h>
12#include <linux/ipv6.h>
13#include <linux/types.h>
14#include <net/checksum.h>
15#include <net/ipv6.h>
16
17#include <asm/byteorder.h>
18
19#include <linux/netfilter_ipv6/ip6_tables.h>
20#include <linux/netfilter_ipv6/ip6t_opts.h>
21
22#define HOPBYHOP 0
23
24MODULE_LICENSE("GPL");
25#if HOPBYHOP
26MODULE_DESCRIPTION("IPv6 HbH match");
27#else
28MODULE_DESCRIPTION("IPv6 DST match");
29#endif
30MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
31
32#if 0
33#define DEBUGP printk
34#else
35#define DEBUGP(format, args...)
36#endif
37
38/*
39 * (Type & 0xC0) >> 6
40 * 0 -> ignorable
41 * 1 -> must drop the packet
42 * 2 -> send ICMP PARM PROB regardless and drop packet
43 * 3 -> Send ICMP if not a multicast address and drop packet
44 * (Type & 0x20) >> 5
45 * 0 -> invariant
46 * 1 -> can change the routing
47 * (Type & 0x1F) Type
48 * 0 -> Pad1 (only 1 byte!)
49 * 1 -> PadN LENGTH info (total length = length + 2)
50 * C0 | 2 -> JUMBO 4 x x x x ( xxxx > 64k )
51 * 5 -> RTALERT 2 x x
52 */
53
54static int
55match(const struct sk_buff *skb,
56 const struct net_device *in,
57 const struct net_device *out,
58 const struct xt_match *match,
59 const void *matchinfo,
60 int offset,
61 unsigned int protoff,
62 int *hotdrop)
63{
64 struct ipv6_opt_hdr _optsh, *oh;
65 const struct ip6t_opts *optinfo = matchinfo;
66 unsigned int temp;
67 unsigned int ptr;
68 unsigned int hdrlen = 0;
69 unsigned int ret = 0;
70 u8 _opttype, *tp = NULL;
71 u8 _optlen, *lp = NULL;
72 unsigned int optlen;
73
74#if HOPBYHOP
75 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP, NULL) < 0)
76#else
77 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST, NULL) < 0)
78#endif
79 return 0;
80
81 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
82 if (oh == NULL) {
83 *hotdrop = 1;
84 return 0;
85 }
86
87 hdrlen = ipv6_optlen(oh);
88 if (skb->len - ptr < hdrlen) {
89 /* Packet smaller than it's length field */
90 return 0;
91 }
92
93 DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
94
95 DEBUGP("len %02X %04X %02X ",
96 optinfo->hdrlen, hdrlen,
97 (!(optinfo->flags & IP6T_OPTS_LEN) ||
98 ((optinfo->hdrlen == hdrlen) ^
99 !!(optinfo->invflags & IP6T_OPTS_INV_LEN))));
100
101 ret = (oh != NULL) &&
102 (!(optinfo->flags & IP6T_OPTS_LEN) ||
103 ((optinfo->hdrlen == hdrlen) ^
104 !!(optinfo->invflags & IP6T_OPTS_INV_LEN)));
105
106 ptr += 2;
107 hdrlen -= 2;
108 if (!(optinfo->flags & IP6T_OPTS_OPTS)) {
109 return ret;
110 } else if (optinfo->flags & IP6T_OPTS_NSTRICT) {
111 DEBUGP("Not strict - not implemented");
112 } else {
113 DEBUGP("Strict ");
114 DEBUGP("#%d ", optinfo->optsnr);
115 for (temp = 0; temp < optinfo->optsnr; temp++) {
116 /* type field exists ? */
117 if (hdrlen < 1)
118 break;
119 tp = skb_header_pointer(skb, ptr, sizeof(_opttype),
120 &_opttype);
121 if (tp == NULL)
122 break;
123
124 /* Type check */
125 if (*tp != (optinfo->opts[temp] & 0xFF00) >> 8) {
126 DEBUGP("Tbad %02X %02X\n",
127 *tp,
128 (optinfo->opts[temp] & 0xFF00) >> 8);
129 return 0;
130 } else {
131 DEBUGP("Tok ");
132 }
133 /* Length check */
134 if (*tp) {
135 u16 spec_len;
136
137 /* length field exists ? */
138 if (hdrlen < 2)
139 break;
140 lp = skb_header_pointer(skb, ptr + 1,
141 sizeof(_optlen),
142 &_optlen);
143 if (lp == NULL)
144 break;
145 spec_len = optinfo->opts[temp] & 0x00FF;
146
147 if (spec_len != 0x00FF && spec_len != *lp) {
148 DEBUGP("Lbad %02X %04X\n", *lp,
149 spec_len);
150 return 0;
151 }
152 DEBUGP("Lok ");
153 optlen = *lp + 2;
154 } else {
155 DEBUGP("Pad1\n");
156 optlen = 1;
157 }
158
159 /* Step to the next */
160 DEBUGP("len%04X \n", optlen);
161
162 if ((ptr > skb->len - optlen || hdrlen < optlen) &&
163 (temp < optinfo->optsnr - 1)) {
164 DEBUGP("new pointer is too large! \n");
165 break;
166 }
167 ptr += optlen;
168 hdrlen -= optlen;
169 }
170 if (temp == optinfo->optsnr)
171 return ret;
172 else
173 return 0;
174 }
175
176 return 0;
177}
178
179/* Called when user tries to insert an entry of this type. */
180static int
181checkentry(const char *tablename,
182 const void *info,
183 const struct xt_match *match,
184 void *matchinfo,
185 unsigned int hook_mask)
186{
187 const struct ip6t_opts *optsinfo = matchinfo;
188
189 if (optsinfo->invflags & ~IP6T_OPTS_INV_MASK) {
190 DEBUGP("ip6t_opts: unknown flags %X\n", optsinfo->invflags);
191 return 0;
192 }
193 return 1;
194}
195
196static struct ip6t_match opts_match = {
197#if HOPBYHOP
198 .name = "hbh",
199#else
200 .name = "dst",
201#endif
202 .match = match,
203 .matchsize = sizeof(struct ip6t_opts),
204 .checkentry = checkentry,
205 .me = THIS_MODULE,
206};
207
208static int __init ip6t_dst_init(void)
209{
210 return ip6t_register_match(&opts_match);
211}
212
213static void __exit ip6t_dst_fini(void)
214{
215 ip6t_unregister_match(&opts_match);
216}
217
218module_init(ip6t_dst_init);
219module_exit(ip6t_dst_fini);
diff --git a/net/ipv6/netfilter/ip6t_hbh.c b/net/ipv6/netfilter/ip6t_hbh.c
index 72defc816563..d32a205e3af2 100644
--- a/net/ipv6/netfilter/ip6t_hbh.c
+++ b/net/ipv6/netfilter/ip6t_hbh.c
@@ -19,15 +19,10 @@
19#include <linux/netfilter_ipv6/ip6_tables.h> 19#include <linux/netfilter_ipv6/ip6_tables.h>
20#include <linux/netfilter_ipv6/ip6t_opts.h> 20#include <linux/netfilter_ipv6/ip6t_opts.h>
21 21
22#define HOPBYHOP 1
23
24MODULE_LICENSE("GPL"); 22MODULE_LICENSE("GPL");
25#if HOPBYHOP 23MODULE_DESCRIPTION("IPv6 opts match");
26MODULE_DESCRIPTION("IPv6 HbH match");
27#else
28MODULE_DESCRIPTION("IPv6 DST match");
29#endif
30MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>"); 24MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
25MODULE_ALIAS("ip6t_dst");
31 26
32#if 0 27#if 0
33#define DEBUGP printk 28#define DEBUGP printk
@@ -71,11 +66,7 @@ match(const struct sk_buff *skb,
71 u8 _optlen, *lp = NULL; 66 u8 _optlen, *lp = NULL;
72 unsigned int optlen; 67 unsigned int optlen;
73 68
74#if HOPBYHOP 69 if (ipv6_find_hdr(skb, &ptr, match->data, NULL) < 0)
75 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP, NULL) < 0)
76#else
77 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST, NULL) < 0)
78#endif
79 return 0; 70 return 0;
80 71
81 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh); 72 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
@@ -193,26 +184,35 @@ checkentry(const char *tablename,
193 return 1; 184 return 1;
194} 185}
195 186
196static struct ip6t_match opts_match = { 187static struct xt_match opts_match[] = {
197#if HOPBYHOP 188 {
198 .name = "hbh", 189 .name = "hbh",
199#else 190 .family = AF_INET6,
200 .name = "dst", 191 .match = match,
201#endif 192 .matchsize = sizeof(struct ip6t_opts),
202 .match = match, 193 .checkentry = checkentry,
203 .matchsize = sizeof(struct ip6t_opts), 194 .me = THIS_MODULE,
204 .checkentry = checkentry, 195 .data = NEXTHDR_HOP,
205 .me = THIS_MODULE, 196 },
197 {
198 .name = "dst",
199 .family = AF_INET6,
200 .match = match,
201 .matchsize = sizeof(struct ip6t_opts),
202 .checkentry = checkentry,
203 .me = THIS_MODULE,
204 .data = NEXTHDR_DEST,
205 },
206}; 206};
207 207
208static int __init ip6t_hbh_init(void) 208static int __init ip6t_hbh_init(void)
209{ 209{
210 return ip6t_register_match(&opts_match); 210 return xt_register_matches(opts_match, ARRAY_SIZE(opts_match));
211} 211}
212 212
213static void __exit ip6t_hbh_fini(void) 213static void __exit ip6t_hbh_fini(void)
214{ 214{
215 ip6t_unregister_match(&opts_match); 215 xt_unregister_matches(opts_match, ARRAY_SIZE(opts_match));
216} 216}
217 217
218module_init(ip6t_hbh_init); 218module_init(ip6t_hbh_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 12:51:48 -0500