Commit | Line | Data |
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0dc8c760 JE |
1 | /* |
2 | * xt_CONNMARK - Netfilter module to modify the connection mark values | |
1da177e4 | 3 | * |
0dc8c760 JE |
4 | * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> |
5 | * by Henrik Nordstrom <hno@marasystems.com> | |
6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
7 | * Jan Engelhardt <jengelh@computergmbh.de> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | #include <linux/module.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/ip.h> | |
26 | #include <net/checksum.h> | |
27 | ||
3a4fa0a2 | 28 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
2ae15b64 | 29 | MODULE_DESCRIPTION("Xtables: connection mark modification"); |
1da177e4 | 30 | MODULE_LICENSE("GPL"); |
2e4e6a17 | 31 | MODULE_ALIAS("ipt_CONNMARK"); |
73aaf935 | 32 | MODULE_ALIAS("ip6t_CONNMARK"); |
1da177e4 | 33 | |
2e4e6a17 HW |
34 | #include <linux/netfilter/x_tables.h> |
35 | #include <linux/netfilter/xt_CONNMARK.h> | |
f6180121 | 36 | #include <net/netfilter/nf_conntrack_ecache.h> |
1da177e4 LT |
37 | |
38 | static unsigned int | |
7eb35586 | 39 | connmark_tg_v0(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 | 40 | { |
7eb35586 | 41 | const struct xt_connmark_target_info *markinfo = par->targinfo; |
587aa641 PM |
42 | struct nf_conn *ct; |
43 | enum ip_conntrack_info ctinfo; | |
bf3a46aa | 44 | u_int32_t diff; |
82e91ffe | 45 | u_int32_t mark; |
bf3a46aa | 46 | u_int32_t newmark; |
1da177e4 | 47 | |
3db05fea | 48 | ct = nf_ct_get(skb, &ctinfo); |
587aa641 | 49 | if (ct) { |
90528e6f PM |
50 | switch(markinfo->mode) { |
51 | case XT_CONNMARK_SET: | |
587aa641 PM |
52 | newmark = (ct->mark & ~markinfo->mask) | markinfo->mark; |
53 | if (newmark != ct->mark) { | |
54 | ct->mark = newmark; | |
a71996fc | 55 | nf_conntrack_event_cache(IPCT_MARK, ct); |
2822b0d9 | 56 | } |
90528e6f PM |
57 | break; |
58 | case XT_CONNMARK_SAVE: | |
587aa641 | 59 | newmark = (ct->mark & ~markinfo->mask) | |
3db05fea | 60 | (skb->mark & markinfo->mask); |
587aa641 PM |
61 | if (ct->mark != newmark) { |
62 | ct->mark = newmark; | |
a71996fc | 63 | nf_conntrack_event_cache(IPCT_MARK, ct); |
90528e6f PM |
64 | } |
65 | break; | |
66 | case XT_CONNMARK_RESTORE: | |
3db05fea | 67 | mark = skb->mark; |
587aa641 | 68 | diff = (ct->mark ^ mark) & markinfo->mask; |
3db05fea | 69 | skb->mark = mark ^ diff; |
90528e6f | 70 | break; |
2521c12c | 71 | } |
1da177e4 LT |
72 | } |
73 | ||
2e4e6a17 | 74 | return XT_CONTINUE; |
1da177e4 LT |
75 | } |
76 | ||
0dc8c760 | 77 | static unsigned int |
7eb35586 | 78 | connmark_tg(struct sk_buff *skb, const struct xt_target_param *par) |
0dc8c760 | 79 | { |
7eb35586 | 80 | const struct xt_connmark_tginfo1 *info = par->targinfo; |
0dc8c760 JE |
81 | enum ip_conntrack_info ctinfo; |
82 | struct nf_conn *ct; | |
83 | u_int32_t newmark; | |
84 | ||
85 | ct = nf_ct_get(skb, &ctinfo); | |
86 | if (ct == NULL) | |
87 | return XT_CONTINUE; | |
88 | ||
89 | switch (info->mode) { | |
90 | case XT_CONNMARK_SET: | |
91 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; | |
92 | if (ct->mark != newmark) { | |
93 | ct->mark = newmark; | |
a71996fc | 94 | nf_conntrack_event_cache(IPCT_MARK, ct); |
0dc8c760 JE |
95 | } |
96 | break; | |
97 | case XT_CONNMARK_SAVE: | |
98 | newmark = (ct->mark & ~info->ctmask) ^ | |
99 | (skb->mark & info->nfmask); | |
100 | if (ct->mark != newmark) { | |
101 | ct->mark = newmark; | |
a71996fc | 102 | nf_conntrack_event_cache(IPCT_MARK, ct); |
0dc8c760 JE |
103 | } |
104 | break; | |
105 | case XT_CONNMARK_RESTORE: | |
106 | newmark = (skb->mark & ~info->nfmask) ^ | |
107 | (ct->mark & info->ctmask); | |
108 | skb->mark = newmark; | |
109 | break; | |
110 | } | |
111 | ||
112 | return XT_CONTINUE; | |
113 | } | |
114 | ||
af5d6dc2 | 115 | static bool connmark_tg_check_v0(const struct xt_tgchk_param *par) |
1da177e4 | 116 | { |
af5d6dc2 | 117 | const struct xt_connmark_target_info *matchinfo = par->targinfo; |
1da177e4 | 118 | |
2e4e6a17 | 119 | if (matchinfo->mode == XT_CONNMARK_RESTORE) { |
af5d6dc2 | 120 | if (strcmp(par->table, "mangle") != 0) { |
90528e6f PM |
121 | printk(KERN_WARNING "CONNMARK: restore can only be " |
122 | "called from \"mangle\" table, not \"%s\"\n", | |
af5d6dc2 | 123 | par->table); |
e1931b78 | 124 | return false; |
90528e6f | 125 | } |
1da177e4 | 126 | } |
bf3a46aa HW |
127 | if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) { |
128 | printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n"); | |
e1931b78 | 129 | return false; |
bf3a46aa | 130 | } |
92f3b2b1 | 131 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
67b4af29 | 132 | printk(KERN_WARNING "can't load conntrack support for " |
92f3b2b1 | 133 | "proto=%u\n", par->family); |
67b4af29 JE |
134 | return false; |
135 | } | |
e1931b78 | 136 | return true; |
1da177e4 LT |
137 | } |
138 | ||
af5d6dc2 | 139 | static bool connmark_tg_check(const struct xt_tgchk_param *par) |
0dc8c760 | 140 | { |
92f3b2b1 | 141 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
0dc8c760 | 142 | printk(KERN_WARNING "cannot load conntrack support for " |
92f3b2b1 | 143 | "proto=%u\n", par->family); |
0dc8c760 JE |
144 | return false; |
145 | } | |
146 | return true; | |
147 | } | |
148 | ||
a2df1648 | 149 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
11078c37 | 150 | { |
92f3b2b1 | 151 | nf_ct_l3proto_module_put(par->family); |
11078c37 YK |
152 | } |
153 | ||
7ce975b9 PM |
154 | #ifdef CONFIG_COMPAT |
155 | struct compat_xt_connmark_target_info { | |
156 | compat_ulong_t mark, mask; | |
157 | u_int8_t mode; | |
158 | u_int8_t __pad1; | |
159 | u_int16_t __pad2; | |
160 | }; | |
161 | ||
0dc8c760 | 162 | static void connmark_tg_compat_from_user_v0(void *dst, void *src) |
7ce975b9 | 163 | { |
a47362a2 | 164 | const struct compat_xt_connmark_target_info *cm = src; |
7ce975b9 PM |
165 | struct xt_connmark_target_info m = { |
166 | .mark = cm->mark, | |
167 | .mask = cm->mask, | |
168 | .mode = cm->mode, | |
169 | }; | |
170 | memcpy(dst, &m, sizeof(m)); | |
171 | } | |
172 | ||
0dc8c760 | 173 | static int connmark_tg_compat_to_user_v0(void __user *dst, void *src) |
7ce975b9 | 174 | { |
a47362a2 | 175 | const struct xt_connmark_target_info *m = src; |
7ce975b9 PM |
176 | struct compat_xt_connmark_target_info cm = { |
177 | .mark = m->mark, | |
178 | .mask = m->mask, | |
179 | .mode = m->mode, | |
180 | }; | |
181 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
182 | } | |
183 | #endif /* CONFIG_COMPAT */ | |
184 | ||
d3c5ee6d | 185 | static struct xt_target connmark_tg_reg[] __read_mostly = { |
4470bbc7 PM |
186 | { |
187 | .name = "CONNMARK", | |
0dc8c760 | 188 | .revision = 0, |
92f3b2b1 | 189 | .family = NFPROTO_UNSPEC, |
0dc8c760 | 190 | .checkentry = connmark_tg_check_v0, |
d3c5ee6d | 191 | .destroy = connmark_tg_destroy, |
0dc8c760 | 192 | .target = connmark_tg_v0, |
4470bbc7 | 193 | .targetsize = sizeof(struct xt_connmark_target_info), |
7ce975b9 PM |
194 | #ifdef CONFIG_COMPAT |
195 | .compatsize = sizeof(struct compat_xt_connmark_target_info), | |
0dc8c760 JE |
196 | .compat_from_user = connmark_tg_compat_from_user_v0, |
197 | .compat_to_user = connmark_tg_compat_to_user_v0, | |
7ce975b9 | 198 | #endif |
4470bbc7 PM |
199 | .me = THIS_MODULE |
200 | }, | |
0dc8c760 JE |
201 | { |
202 | .name = "CONNMARK", | |
203 | .revision = 1, | |
92f3b2b1 | 204 | .family = NFPROTO_UNSPEC, |
0dc8c760 JE |
205 | .checkentry = connmark_tg_check, |
206 | .target = connmark_tg, | |
207 | .targetsize = sizeof(struct xt_connmark_tginfo1), | |
208 | .destroy = connmark_tg_destroy, | |
209 | .me = THIS_MODULE, | |
210 | }, | |
1da177e4 LT |
211 | }; |
212 | ||
d3c5ee6d | 213 | static int __init connmark_tg_init(void) |
1da177e4 | 214 | { |
d3c5ee6d JE |
215 | return xt_register_targets(connmark_tg_reg, |
216 | ARRAY_SIZE(connmark_tg_reg)); | |
1da177e4 LT |
217 | } |
218 | ||
d3c5ee6d | 219 | static void __exit connmark_tg_exit(void) |
1da177e4 | 220 | { |
d3c5ee6d | 221 | xt_unregister_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg)); |
1da177e4 LT |
222 | } |
223 | ||
d3c5ee6d JE |
224 | module_init(connmark_tg_init); |
225 | module_exit(connmark_tg_exit); |