Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2010 Patrick McHardy <kaber@trash.net> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
Jan Engelhardt | a7fed76 | 2011-04-21 11:05:14 +0200 | [diff] [blame] | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 9 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/gfp.h> |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 11 | #include <linux/skbuff.h> |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 12 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 13 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 14 | #include <linux/netfilter/x_tables.h> |
| 15 | #include <linux/netfilter/xt_CT.h> |
| 16 | #include <net/netfilter/nf_conntrack.h> |
Pablo Neira Ayuso | eeb4cb9 | 2012-03-23 00:02:07 +0100 | [diff] [blame] | 17 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 18 | #include <net/netfilter/nf_conntrack_helper.h> |
| 19 | #include <net/netfilter/nf_conntrack_ecache.h> |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 20 | #include <net/netfilter/nf_conntrack_timeout.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 21 | #include <net/netfilter/nf_conntrack_zones.h> |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 22 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 23 | static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct) |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 24 | { |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 25 | /* Previously seen (loopback)? Ignore. */ |
| 26 | if (skb->nfct != NULL) |
| 27 | return XT_CONTINUE; |
| 28 | |
Eric Dumazet | 27e7190 | 2013-05-22 11:10:57 +0000 | [diff] [blame] | 29 | /* special case the untracked ct : we want the percpu object */ |
| 30 | if (!ct) |
| 31 | ct = nf_ct_untracked_get(); |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 32 | atomic_inc(&ct->ct_general.use); |
| 33 | skb->nfct = &ct->ct_general; |
| 34 | skb->nfctinfo = IP_CT_NEW; |
| 35 | |
| 36 | return XT_CONTINUE; |
| 37 | } |
| 38 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 39 | static unsigned int xt_ct_target_v0(struct sk_buff *skb, |
| 40 | const struct xt_action_param *par) |
| 41 | { |
| 42 | const struct xt_ct_target_info *info = par->targinfo; |
| 43 | struct nf_conn *ct = info->ct; |
| 44 | |
| 45 | return xt_ct_target(skb, ct); |
| 46 | } |
| 47 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 48 | static unsigned int xt_ct_target_v1(struct sk_buff *skb, |
| 49 | const struct xt_action_param *par) |
| 50 | { |
| 51 | const struct xt_ct_target_info_v1 *info = par->targinfo; |
| 52 | struct nf_conn *ct = info->ct; |
| 53 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 54 | return xt_ct_target(skb, ct); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 55 | } |
| 56 | |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 57 | static u8 xt_ct_find_proto(const struct xt_tgchk_param *par) |
| 58 | { |
Jan Engelhardt | 076f783 | 2010-03-11 00:38:44 +0100 | [diff] [blame] | 59 | if (par->family == NFPROTO_IPV4) { |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 60 | const struct ipt_entry *e = par->entryinfo; |
| 61 | |
| 62 | if (e->ip.invflags & IPT_INV_PROTO) |
| 63 | return 0; |
| 64 | return e->ip.proto; |
Jan Engelhardt | 076f783 | 2010-03-11 00:38:44 +0100 | [diff] [blame] | 65 | } else if (par->family == NFPROTO_IPV6) { |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 66 | const struct ip6t_entry *e = par->entryinfo; |
| 67 | |
| 68 | if (e->ipv6.invflags & IP6T_INV_PROTO) |
| 69 | return 0; |
| 70 | return e->ipv6.proto; |
| 71 | } else |
| 72 | return 0; |
| 73 | } |
| 74 | |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 75 | static int |
| 76 | xt_ct_set_helper(struct nf_conn *ct, const char *helper_name, |
| 77 | const struct xt_tgchk_param *par) |
| 78 | { |
| 79 | struct nf_conntrack_helper *helper; |
| 80 | struct nf_conn_help *help; |
| 81 | u8 proto; |
| 82 | |
| 83 | proto = xt_ct_find_proto(par); |
| 84 | if (!proto) { |
| 85 | pr_info("You must specify a L4 protocol, and not use " |
| 86 | "inversions on it.\n"); |
| 87 | return -ENOENT; |
| 88 | } |
| 89 | |
| 90 | helper = nf_conntrack_helper_try_module_get(helper_name, par->family, |
| 91 | proto); |
| 92 | if (helper == NULL) { |
| 93 | pr_info("No such helper \"%s\"\n", helper_name); |
| 94 | return -ENOENT; |
| 95 | } |
| 96 | |
| 97 | help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL); |
| 98 | if (help == NULL) { |
| 99 | module_put(helper->me); |
| 100 | return -ENOMEM; |
| 101 | } |
| 102 | |
| 103 | help->helper = helper; |
| 104 | return 0; |
| 105 | } |
| 106 | |
Pablo Neira Ayuso | ee14186 | 2012-04-03 14:50:07 +0200 | [diff] [blame] | 107 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 108 | static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout) |
| 109 | { |
| 110 | typeof(nf_ct_timeout_put_hook) timeout_put; |
| 111 | |
| 112 | timeout_put = rcu_dereference(nf_ct_timeout_put_hook); |
| 113 | if (timeout_put) |
| 114 | timeout_put(timeout); |
| 115 | } |
| 116 | #endif |
| 117 | |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 118 | static int |
| 119 | xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par, |
| 120 | const char *timeout_name) |
| 121 | { |
| 122 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 123 | typeof(nf_ct_timeout_find_get_hook) timeout_find_get; |
| 124 | struct ctnl_timeout *timeout; |
| 125 | struct nf_conn_timeout *timeout_ext; |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 126 | struct nf_conntrack_l4proto *l4proto; |
| 127 | int ret = 0; |
Pablo Neira Ayuso | 0153d5a | 2012-10-11 10:49:12 +0200 | [diff] [blame] | 128 | u8 proto; |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 129 | |
| 130 | rcu_read_lock(); |
| 131 | timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook); |
| 132 | if (timeout_find_get == NULL) { |
| 133 | ret = -ENOENT; |
| 134 | pr_info("Timeout policy base is empty\n"); |
| 135 | goto out; |
| 136 | } |
| 137 | |
Pablo Neira Ayuso | 0153d5a | 2012-10-11 10:49:12 +0200 | [diff] [blame] | 138 | proto = xt_ct_find_proto(par); |
| 139 | if (!proto) { |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 140 | ret = -EINVAL; |
Pablo Neira Ayuso | 0153d5a | 2012-10-11 10:49:12 +0200 | [diff] [blame] | 141 | pr_info("You must specify a L4 protocol, and not use " |
| 142 | "inversions on it.\n"); |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 143 | goto out; |
| 144 | } |
| 145 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 146 | timeout = timeout_find_get(par->net, timeout_name); |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 147 | if (timeout == NULL) { |
| 148 | ret = -ENOENT; |
| 149 | pr_info("No such timeout policy \"%s\"\n", timeout_name); |
| 150 | goto out; |
| 151 | } |
| 152 | |
| 153 | if (timeout->l3num != par->family) { |
| 154 | ret = -EINVAL; |
| 155 | pr_info("Timeout policy `%s' can only be used by L3 protocol " |
| 156 | "number %d\n", timeout_name, timeout->l3num); |
| 157 | goto err_put_timeout; |
| 158 | } |
| 159 | /* Make sure the timeout policy matches any existing protocol tracker, |
| 160 | * otherwise default to generic. |
| 161 | */ |
Pablo Neira Ayuso | 0153d5a | 2012-10-11 10:49:12 +0200 | [diff] [blame] | 162 | l4proto = __nf_ct_l4proto_find(par->family, proto); |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 163 | if (timeout->l4proto->l4proto != l4proto->l4proto) { |
| 164 | ret = -EINVAL; |
| 165 | pr_info("Timeout policy `%s' can only be used by L4 protocol " |
| 166 | "number %d\n", |
| 167 | timeout_name, timeout->l4proto->l4proto); |
| 168 | goto err_put_timeout; |
| 169 | } |
| 170 | timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC); |
| 171 | if (timeout_ext == NULL) |
| 172 | ret = -ENOMEM; |
| 173 | |
Pablo Neira Ayuso | 403d89a | 2015-10-05 16:51:03 +0200 | [diff] [blame] | 174 | rcu_read_unlock(); |
| 175 | return ret; |
| 176 | |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 177 | err_put_timeout: |
| 178 | __xt_ct_tg_timeout_put(timeout); |
| 179 | out: |
| 180 | rcu_read_unlock(); |
| 181 | return ret; |
| 182 | #else |
| 183 | return -EOPNOTSUPP; |
| 184 | #endif |
| 185 | } |
| 186 | |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 187 | static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info) |
| 188 | { |
| 189 | switch (info->flags & (XT_CT_ZONE_DIR_ORIG | |
| 190 | XT_CT_ZONE_DIR_REPL)) { |
| 191 | case XT_CT_ZONE_DIR_ORIG: |
| 192 | return NF_CT_ZONE_DIR_ORIG; |
| 193 | case XT_CT_ZONE_DIR_REPL: |
| 194 | return NF_CT_ZONE_DIR_REPL; |
| 195 | default: |
| 196 | return NF_CT_DEFAULT_ZONE_DIR; |
| 197 | } |
| 198 | } |
| 199 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 200 | static int xt_ct_tg_check(const struct xt_tgchk_param *par, |
| 201 | struct xt_ct_target_info_v1 *info) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 202 | { |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 203 | struct nf_conntrack_zone zone; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 204 | struct nf_conn *ct; |
Pablo Neira Ayuso | 4610476 | 2013-01-10 12:42:15 +0100 | [diff] [blame] | 205 | int ret = -EOPNOTSUPP; |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 206 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 207 | if (info->flags & XT_CT_NOTRACK) { |
Eric Dumazet | 27e7190 | 2013-05-22 11:10:57 +0000 | [diff] [blame] | 208 | ct = NULL; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 209 | goto out; |
| 210 | } |
| 211 | |
| 212 | #ifndef CONFIG_NF_CONNTRACK_ZONES |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 213 | if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG | |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 214 | XT_CT_ZONE_DIR_REPL | |
| 215 | XT_CT_ZONE_MARK)) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 216 | goto err1; |
| 217 | #endif |
| 218 | |
| 219 | ret = nf_ct_l3proto_try_module_get(par->family); |
| 220 | if (ret < 0) |
| 221 | goto err1; |
| 222 | |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 223 | memset(&zone, 0, sizeof(zone)); |
| 224 | zone.id = info->zone; |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 225 | zone.dir = xt_ct_flags_to_dir(info); |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 226 | if (info->flags & XT_CT_ZONE_MARK) |
| 227 | zone.flags |= NF_CT_FLAG_MARK; |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 228 | |
| 229 | ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL); |
Dan Carpenter | 1a727c6 | 2015-07-28 01:42:28 +0300 | [diff] [blame] | 230 | if (!ct) { |
| 231 | ret = -ENOMEM; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 232 | goto err2; |
Dan Carpenter | 1a727c6 | 2015-07-28 01:42:28 +0300 | [diff] [blame] | 233 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 234 | |
| 235 | ret = 0; |
| 236 | if ((info->ct_events || info->exp_events) && |
| 237 | !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events, |
Eric Leblond | 14abfa1 | 2014-01-02 10:03:45 +0100 | [diff] [blame] | 238 | GFP_KERNEL)) { |
| 239 | ret = -EINVAL; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 240 | goto err3; |
Eric Leblond | 14abfa1 | 2014-01-02 10:03:45 +0100 | [diff] [blame] | 241 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 242 | |
| 243 | if (info->helper[0]) { |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 244 | ret = xt_ct_set_helper(ct, info->helper, par); |
| 245 | if (ret < 0) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 246 | goto err3; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 247 | } |
| 248 | |
Pablo Neira Ayuso | 6cf5185 | 2012-04-27 02:00:50 +0200 | [diff] [blame] | 249 | if (info->timeout[0]) { |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 250 | ret = xt_ct_set_timeout(ct, par, info->timeout); |
| 251 | if (ret < 0) |
| 252 | goto err3; |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 253 | } |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 254 | __set_bit(IPS_CONFIRMED_BIT, &ct->status); |
| 255 | nf_conntrack_get(&ct->ct_general); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 256 | out: |
| 257 | info->ct = ct; |
| 258 | return 0; |
| 259 | |
| 260 | err3: |
Daniel Borkmann | 9cf94ea | 2015-08-31 19:11:02 +0200 | [diff] [blame] | 261 | nf_ct_tmpl_free(ct); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 262 | err2: |
| 263 | nf_ct_l3proto_module_put(par->family); |
| 264 | err1: |
| 265 | return ret; |
| 266 | } |
| 267 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 268 | static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par) |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 269 | { |
| 270 | struct xt_ct_target_info *info = par->targinfo; |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 271 | struct xt_ct_target_info_v1 info_v1 = { |
| 272 | .flags = info->flags, |
| 273 | .zone = info->zone, |
| 274 | .ct_events = info->ct_events, |
| 275 | .exp_events = info->exp_events, |
| 276 | }; |
| 277 | int ret; |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 278 | |
Pablo Neira Ayuso | 5474f57 | 2013-01-30 20:24:22 +0100 | [diff] [blame] | 279 | if (info->flags & ~XT_CT_NOTRACK) |
| 280 | return -EINVAL; |
| 281 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 282 | memcpy(info_v1.helper, info->helper, sizeof(info->helper)); |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 283 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 284 | ret = xt_ct_tg_check(par, &info_v1); |
| 285 | if (ret < 0) |
| 286 | return ret; |
| 287 | |
| 288 | info->ct = info_v1.ct; |
| 289 | |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par) |
| 294 | { |
Pablo Neira Ayuso | 5474f57 | 2013-01-30 20:24:22 +0100 | [diff] [blame] | 295 | struct xt_ct_target_info_v1 *info = par->targinfo; |
| 296 | |
| 297 | if (info->flags & ~XT_CT_NOTRACK) |
| 298 | return -EINVAL; |
| 299 | |
| 300 | return xt_ct_tg_check(par, par->targinfo); |
| 301 | } |
| 302 | |
| 303 | static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par) |
| 304 | { |
| 305 | struct xt_ct_target_info_v1 *info = par->targinfo; |
| 306 | |
| 307 | if (info->flags & ~XT_CT_MASK) |
| 308 | return -EINVAL; |
| 309 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 310 | return xt_ct_tg_check(par, par->targinfo); |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 311 | } |
| 312 | |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 313 | static void xt_ct_destroy_timeout(struct nf_conn *ct) |
| 314 | { |
| 315 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 316 | struct nf_conn_timeout *timeout_ext; |
| 317 | typeof(nf_ct_timeout_put_hook) timeout_put; |
| 318 | |
| 319 | rcu_read_lock(); |
| 320 | timeout_put = rcu_dereference(nf_ct_timeout_put_hook); |
| 321 | |
| 322 | if (timeout_put) { |
| 323 | timeout_ext = nf_ct_timeout_find(ct); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 324 | if (timeout_ext) { |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 325 | timeout_put(timeout_ext->timeout); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 326 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); |
| 327 | } |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 328 | } |
| 329 | rcu_read_unlock(); |
| 330 | #endif |
| 331 | } |
| 332 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 333 | static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par, |
| 334 | struct xt_ct_target_info_v1 *info) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 335 | { |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 336 | struct nf_conn *ct = info->ct; |
| 337 | struct nf_conn_help *help; |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 338 | |
Eric Dumazet | 27e7190 | 2013-05-22 11:10:57 +0000 | [diff] [blame] | 339 | if (ct && !nf_ct_is_untracked(ct)) { |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 340 | help = nfct_help(ct); |
| 341 | if (help) |
| 342 | module_put(help->helper->me); |
| 343 | |
| 344 | nf_ct_l3proto_module_put(par->family); |
| 345 | |
Pablo Neira Ayuso | 236df00 | 2012-08-28 00:53:14 +0000 | [diff] [blame] | 346 | xt_ct_destroy_timeout(ct); |
Eric Dumazet | 27e7190 | 2013-05-22 11:10:57 +0000 | [diff] [blame] | 347 | nf_ct_put(info->ct); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 348 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 349 | } |
| 350 | |
Pablo Neira Ayuso | d52ed43 | 2013-01-30 20:20:39 +0100 | [diff] [blame] | 351 | static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par) |
| 352 | { |
| 353 | struct xt_ct_target_info *info = par->targinfo; |
| 354 | struct xt_ct_target_info_v1 info_v1 = { |
| 355 | .flags = info->flags, |
| 356 | .zone = info->zone, |
| 357 | .ct_events = info->ct_events, |
| 358 | .exp_events = info->exp_events, |
| 359 | .ct = info->ct, |
| 360 | }; |
| 361 | memcpy(info_v1.helper, info->helper, sizeof(info->helper)); |
| 362 | |
| 363 | xt_ct_tg_destroy(par, &info_v1); |
| 364 | } |
| 365 | |
| 366 | static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par) |
| 367 | { |
| 368 | xt_ct_tg_destroy(par, par->targinfo); |
| 369 | } |
| 370 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 371 | static struct xt_target xt_ct_tg_reg[] __read_mostly = { |
| 372 | { |
| 373 | .name = "CT", |
| 374 | .family = NFPROTO_UNSPEC, |
| 375 | .targetsize = sizeof(struct xt_ct_target_info), |
| 376 | .checkentry = xt_ct_tg_check_v0, |
| 377 | .destroy = xt_ct_tg_destroy_v0, |
| 378 | .target = xt_ct_target_v0, |
| 379 | .table = "raw", |
| 380 | .me = THIS_MODULE, |
| 381 | }, |
| 382 | { |
| 383 | .name = "CT", |
| 384 | .family = NFPROTO_UNSPEC, |
| 385 | .revision = 1, |
| 386 | .targetsize = sizeof(struct xt_ct_target_info_v1), |
| 387 | .checkentry = xt_ct_tg_check_v1, |
| 388 | .destroy = xt_ct_tg_destroy_v1, |
| 389 | .target = xt_ct_target_v1, |
| 390 | .table = "raw", |
| 391 | .me = THIS_MODULE, |
| 392 | }, |
Pablo Neira Ayuso | 5474f57 | 2013-01-30 20:24:22 +0100 | [diff] [blame] | 393 | { |
| 394 | .name = "CT", |
| 395 | .family = NFPROTO_UNSPEC, |
| 396 | .revision = 2, |
| 397 | .targetsize = sizeof(struct xt_ct_target_info_v1), |
| 398 | .checkentry = xt_ct_tg_check_v2, |
| 399 | .destroy = xt_ct_tg_destroy_v1, |
| 400 | .target = xt_ct_target_v1, |
| 401 | .table = "raw", |
| 402 | .me = THIS_MODULE, |
| 403 | }, |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 404 | }; |
| 405 | |
Pablo Neira Ayuso | 10db906 | 2012-12-20 01:54:51 +0000 | [diff] [blame] | 406 | static unsigned int |
| 407 | notrack_tg(struct sk_buff *skb, const struct xt_action_param *par) |
| 408 | { |
| 409 | /* Previously seen (loopback)? Ignore. */ |
| 410 | if (skb->nfct != NULL) |
| 411 | return XT_CONTINUE; |
| 412 | |
| 413 | skb->nfct = &nf_ct_untracked_get()->ct_general; |
| 414 | skb->nfctinfo = IP_CT_NEW; |
| 415 | nf_conntrack_get(skb->nfct); |
| 416 | |
| 417 | return XT_CONTINUE; |
| 418 | } |
| 419 | |
| 420 | static int notrack_chk(const struct xt_tgchk_param *par) |
| 421 | { |
| 422 | if (!par->net->xt.notrack_deprecated_warning) { |
| 423 | pr_info("netfilter: NOTRACK target is deprecated, " |
| 424 | "use CT instead or upgrade iptables\n"); |
| 425 | par->net->xt.notrack_deprecated_warning = true; |
| 426 | } |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static struct xt_target notrack_tg_reg __read_mostly = { |
| 431 | .name = "NOTRACK", |
| 432 | .revision = 0, |
| 433 | .family = NFPROTO_UNSPEC, |
| 434 | .checkentry = notrack_chk, |
| 435 | .target = notrack_tg, |
| 436 | .table = "raw", |
| 437 | .me = THIS_MODULE, |
| 438 | }; |
| 439 | |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 440 | static int __init xt_ct_tg_init(void) |
| 441 | { |
Pablo Neira Ayuso | 10db906 | 2012-12-20 01:54:51 +0000 | [diff] [blame] | 442 | int ret; |
| 443 | |
| 444 | ret = xt_register_target(¬rack_tg_reg); |
| 445 | if (ret < 0) |
| 446 | return ret; |
| 447 | |
| 448 | ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg)); |
| 449 | if (ret < 0) { |
| 450 | xt_unregister_target(¬rack_tg_reg); |
| 451 | return ret; |
| 452 | } |
| 453 | return 0; |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | static void __exit xt_ct_tg_exit(void) |
| 457 | { |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 458 | xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg)); |
Pablo Neira Ayuso | 10db906 | 2012-12-20 01:54:51 +0000 | [diff] [blame] | 459 | xt_unregister_target(¬rack_tg_reg); |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | module_init(xt_ct_tg_init); |
| 463 | module_exit(xt_ct_tg_exit); |
| 464 | |
| 465 | MODULE_LICENSE("GPL"); |
| 466 | MODULE_DESCRIPTION("Xtables: connection tracking target"); |
| 467 | MODULE_ALIAS("ipt_CT"); |
| 468 | MODULE_ALIAS("ip6t_CT"); |
Pablo Neira Ayuso | 10db906 | 2012-12-20 01:54:51 +0000 | [diff] [blame] | 469 | MODULE_ALIAS("ipt_NOTRACK"); |
| 470 | MODULE_ALIAS("ip6t_NOTRACK"); |