Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2012 Pablo Neira Ayuso <pablo@netfilter.org> |
| 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 (or any later at your option). |
| 7 | * |
| 8 | * This software has been sponsored by Vyatta Inc. <http://www.vyatta.com> |
| 9 | */ |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/netlink.h> |
| 15 | #include <linux/rculist.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/errno.h> |
Kevin Cernekee | 2c3184e | 2017-12-03 12:12:45 -0800 | [diff] [blame] | 20 | #include <linux/capability.h> |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 21 | #include <net/netlink.h> |
| 22 | #include <net/sock.h> |
| 23 | |
| 24 | #include <net/netfilter/nf_conntrack_helper.h> |
| 25 | #include <net/netfilter/nf_conntrack_expect.h> |
| 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
| 27 | |
| 28 | #include <linux/netfilter/nfnetlink.h> |
| 29 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 30 | #include <linux/netfilter/nfnetlink_cthelper.h> |
| 31 | |
| 32 | MODULE_LICENSE("GPL"); |
| 33 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 34 | MODULE_DESCRIPTION("nfnl_cthelper: User-space connection tracking helpers"); |
| 35 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 36 | struct nfnl_cthelper { |
| 37 | struct list_head list; |
| 38 | struct nf_conntrack_helper helper; |
| 39 | }; |
| 40 | |
| 41 | static LIST_HEAD(nfnl_cthelper_list); |
| 42 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 43 | static int |
| 44 | nfnl_userspace_cthelper(struct sk_buff *skb, unsigned int protoff, |
| 45 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 46 | { |
| 47 | const struct nf_conn_help *help; |
| 48 | struct nf_conntrack_helper *helper; |
| 49 | |
| 50 | help = nfct_help(ct); |
| 51 | if (help == NULL) |
| 52 | return NF_DROP; |
| 53 | |
Aaron Conole | e2361cb | 2016-09-21 11:35:04 -0400 | [diff] [blame] | 54 | /* rcu_read_lock()ed by nf_hook_thresh */ |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 55 | helper = rcu_dereference(help->helper); |
| 56 | if (helper == NULL) |
| 57 | return NF_DROP; |
| 58 | |
| 59 | /* This is an user-space helper not yet configured, skip. */ |
| 60 | if ((helper->flags & |
| 61 | (NF_CT_HELPER_F_USERSPACE | NF_CT_HELPER_F_CONFIGURED)) == |
| 62 | NF_CT_HELPER_F_USERSPACE) |
| 63 | return NF_ACCEPT; |
| 64 | |
| 65 | /* If the user-space helper is not available, don't block traffic. */ |
| 66 | return NF_QUEUE_NR(helper->queue_num) | NF_VERDICT_FLAG_QUEUE_BYPASS; |
| 67 | } |
| 68 | |
| 69 | static const struct nla_policy nfnl_cthelper_tuple_pol[NFCTH_TUPLE_MAX+1] = { |
| 70 | [NFCTH_TUPLE_L3PROTONUM] = { .type = NLA_U16, }, |
| 71 | [NFCTH_TUPLE_L4PROTONUM] = { .type = NLA_U8, }, |
| 72 | }; |
| 73 | |
| 74 | static int |
| 75 | nfnl_cthelper_parse_tuple(struct nf_conntrack_tuple *tuple, |
| 76 | const struct nlattr *attr) |
| 77 | { |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 78 | int err; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 79 | struct nlattr *tb[NFCTH_TUPLE_MAX+1]; |
| 80 | |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 81 | err = nla_parse_nested(tb, NFCTH_TUPLE_MAX, attr, nfnl_cthelper_tuple_pol); |
| 82 | if (err < 0) |
| 83 | return err; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 84 | |
| 85 | if (!tb[NFCTH_TUPLE_L3PROTONUM] || !tb[NFCTH_TUPLE_L4PROTONUM]) |
| 86 | return -EINVAL; |
| 87 | |
Ian Wilson | 7814657 | 2015-03-12 09:37:58 +0000 | [diff] [blame] | 88 | /* Not all fields are initialized so first zero the tuple */ |
| 89 | memset(tuple, 0, sizeof(struct nf_conntrack_tuple)); |
| 90 | |
Patrick McHardy | fe31d1a | 2012-08-19 10:16:09 +0000 | [diff] [blame] | 91 | tuple->src.l3num = ntohs(nla_get_be16(tb[NFCTH_TUPLE_L3PROTONUM])); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 92 | tuple->dst.protonum = nla_get_u8(tb[NFCTH_TUPLE_L4PROTONUM]); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int |
| 98 | nfnl_cthelper_from_nlattr(struct nlattr *attr, struct nf_conn *ct) |
| 99 | { |
Chen Gang | b18c5d1 | 2014-12-24 23:04:54 +0800 | [diff] [blame] | 100 | struct nf_conn_help *help = nfct_help(ct); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 101 | |
Pablo Neira Ayuso | 7be54ca | 2012-09-21 16:52:08 +0200 | [diff] [blame] | 102 | if (attr == NULL) |
| 103 | return -EINVAL; |
| 104 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 105 | if (help->helper->data_len == 0) |
| 106 | return -EINVAL; |
| 107 | |
Chen Gang | b18c5d1 | 2014-12-24 23:04:54 +0800 | [diff] [blame] | 108 | memcpy(help->data, nla_data(attr), help->helper->data_len); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int |
| 113 | nfnl_cthelper_to_nlattr(struct sk_buff *skb, const struct nf_conn *ct) |
| 114 | { |
| 115 | const struct nf_conn_help *help = nfct_help(ct); |
| 116 | |
| 117 | if (help->helper->data_len && |
| 118 | nla_put(skb, CTA_HELP_INFO, help->helper->data_len, &help->data)) |
| 119 | goto nla_put_failure; |
| 120 | |
| 121 | return 0; |
| 122 | |
| 123 | nla_put_failure: |
| 124 | return -ENOSPC; |
| 125 | } |
| 126 | |
| 127 | static const struct nla_policy nfnl_cthelper_expect_pol[NFCTH_POLICY_MAX+1] = { |
| 128 | [NFCTH_POLICY_NAME] = { .type = NLA_NUL_STRING, |
| 129 | .len = NF_CT_HELPER_NAME_LEN-1 }, |
| 130 | [NFCTH_POLICY_EXPECT_MAX] = { .type = NLA_U32, }, |
| 131 | [NFCTH_POLICY_EXPECT_TIMEOUT] = { .type = NLA_U32, }, |
| 132 | }; |
| 133 | |
| 134 | static int |
| 135 | nfnl_cthelper_expect_policy(struct nf_conntrack_expect_policy *expect_policy, |
| 136 | const struct nlattr *attr) |
| 137 | { |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 138 | int err; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 139 | struct nlattr *tb[NFCTH_POLICY_MAX+1]; |
| 140 | |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 141 | err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr, nfnl_cthelper_expect_pol); |
| 142 | if (err < 0) |
| 143 | return err; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 144 | |
| 145 | if (!tb[NFCTH_POLICY_NAME] || |
| 146 | !tb[NFCTH_POLICY_EXPECT_MAX] || |
| 147 | !tb[NFCTH_POLICY_EXPECT_TIMEOUT]) |
| 148 | return -EINVAL; |
| 149 | |
| 150 | strncpy(expect_policy->name, |
| 151 | nla_data(tb[NFCTH_POLICY_NAME]), NF_CT_HELPER_NAME_LEN); |
| 152 | expect_policy->max_expected = |
| 153 | ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_MAX])); |
| 154 | expect_policy->timeout = |
| 155 | ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_TIMEOUT])); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | static const struct nla_policy |
| 161 | nfnl_cthelper_expect_policy_set[NFCTH_POLICY_SET_MAX+1] = { |
| 162 | [NFCTH_POLICY_SET_NUM] = { .type = NLA_U32, }, |
| 163 | }; |
| 164 | |
| 165 | static int |
| 166 | nfnl_cthelper_parse_expect_policy(struct nf_conntrack_helper *helper, |
| 167 | const struct nlattr *attr) |
| 168 | { |
| 169 | int i, ret; |
| 170 | struct nf_conntrack_expect_policy *expect_policy; |
| 171 | struct nlattr *tb[NFCTH_POLICY_SET_MAX+1]; |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 172 | unsigned int class_max; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 173 | |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 174 | ret = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr, |
| 175 | nfnl_cthelper_expect_policy_set); |
| 176 | if (ret < 0) |
| 177 | return ret; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 178 | |
| 179 | if (!tb[NFCTH_POLICY_SET_NUM]) |
| 180 | return -EINVAL; |
| 181 | |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 182 | class_max = ntohl(nla_get_be32(tb[NFCTH_POLICY_SET_NUM])); |
| 183 | if (class_max == 0) |
| 184 | return -EINVAL; |
| 185 | if (class_max > NF_CT_MAX_EXPECT_CLASSES) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 186 | return -EOVERFLOW; |
| 187 | |
| 188 | expect_policy = kzalloc(sizeof(struct nf_conntrack_expect_policy) * |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 189 | class_max, GFP_KERNEL); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 190 | if (expect_policy == NULL) |
| 191 | return -ENOMEM; |
| 192 | |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 193 | for (i = 0; i < class_max; i++) { |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 194 | if (!tb[NFCTH_POLICY_SET+i]) |
| 195 | goto err; |
| 196 | |
| 197 | ret = nfnl_cthelper_expect_policy(&expect_policy[i], |
| 198 | tb[NFCTH_POLICY_SET+i]); |
| 199 | if (ret < 0) |
| 200 | goto err; |
| 201 | } |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 202 | |
| 203 | helper->expect_class_max = class_max - 1; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 204 | helper->expect_policy = expect_policy; |
| 205 | return 0; |
| 206 | err: |
| 207 | kfree(expect_policy); |
| 208 | return -EINVAL; |
| 209 | } |
| 210 | |
| 211 | static int |
| 212 | nfnl_cthelper_create(const struct nlattr * const tb[], |
| 213 | struct nf_conntrack_tuple *tuple) |
| 214 | { |
| 215 | struct nf_conntrack_helper *helper; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 216 | struct nfnl_cthelper *nfcth; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 217 | int ret; |
| 218 | |
| 219 | if (!tb[NFCTH_TUPLE] || !tb[NFCTH_POLICY] || !tb[NFCTH_PRIV_DATA_LEN]) |
| 220 | return -EINVAL; |
| 221 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 222 | nfcth = kzalloc(sizeof(*nfcth), GFP_KERNEL); |
| 223 | if (nfcth == NULL) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 224 | return -ENOMEM; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 225 | helper = &nfcth->helper; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 226 | |
| 227 | ret = nfnl_cthelper_parse_expect_policy(helper, tb[NFCTH_POLICY]); |
| 228 | if (ret < 0) |
Jeffy Chen | 0f0ac21 | 2017-03-21 15:07:10 +0800 | [diff] [blame] | 229 | goto err1; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 230 | |
| 231 | strncpy(helper->name, nla_data(tb[NFCTH_NAME]), NF_CT_HELPER_NAME_LEN); |
| 232 | helper->data_len = ntohl(nla_get_be32(tb[NFCTH_PRIV_DATA_LEN])); |
| 233 | helper->flags |= NF_CT_HELPER_F_USERSPACE; |
| 234 | memcpy(&helper->tuple, tuple, sizeof(struct nf_conntrack_tuple)); |
| 235 | |
| 236 | helper->me = THIS_MODULE; |
| 237 | helper->help = nfnl_userspace_cthelper; |
| 238 | helper->from_nlattr = nfnl_cthelper_from_nlattr; |
| 239 | helper->to_nlattr = nfnl_cthelper_to_nlattr; |
| 240 | |
| 241 | /* Default to queue number zero, this can be updated at any time. */ |
| 242 | if (tb[NFCTH_QUEUE_NUM]) |
| 243 | helper->queue_num = ntohl(nla_get_be32(tb[NFCTH_QUEUE_NUM])); |
| 244 | |
| 245 | if (tb[NFCTH_STATUS]) { |
| 246 | int status = ntohl(nla_get_be32(tb[NFCTH_STATUS])); |
| 247 | |
| 248 | switch(status) { |
| 249 | case NFCT_HELPER_STATUS_ENABLED: |
| 250 | helper->flags |= NF_CT_HELPER_F_CONFIGURED; |
| 251 | break; |
| 252 | case NFCT_HELPER_STATUS_DISABLED: |
| 253 | helper->flags &= ~NF_CT_HELPER_F_CONFIGURED; |
| 254 | break; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | ret = nf_conntrack_helper_register(helper); |
| 259 | if (ret < 0) |
Jeffy Chen | 0f0ac21 | 2017-03-21 15:07:10 +0800 | [diff] [blame] | 260 | goto err2; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 261 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 262 | list_add_tail(&nfcth->list, &nfnl_cthelper_list); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 263 | return 0; |
Jeffy Chen | 0f0ac21 | 2017-03-21 15:07:10 +0800 | [diff] [blame] | 264 | err2: |
| 265 | kfree(helper->expect_policy); |
| 266 | err1: |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 267 | kfree(nfcth); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | static int |
Pablo Neira Ayuso | ec38fb4 | 2017-03-21 13:32:37 +0100 | [diff] [blame] | 272 | nfnl_cthelper_update_policy_one(const struct nf_conntrack_expect_policy *policy, |
| 273 | struct nf_conntrack_expect_policy *new_policy, |
| 274 | const struct nlattr *attr) |
| 275 | { |
| 276 | struct nlattr *tb[NFCTH_POLICY_MAX + 1]; |
| 277 | int err; |
| 278 | |
| 279 | err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr, |
| 280 | nfnl_cthelper_expect_pol); |
| 281 | if (err < 0) |
| 282 | return err; |
| 283 | |
| 284 | if (!tb[NFCTH_POLICY_NAME] || |
| 285 | !tb[NFCTH_POLICY_EXPECT_MAX] || |
| 286 | !tb[NFCTH_POLICY_EXPECT_TIMEOUT]) |
| 287 | return -EINVAL; |
| 288 | |
| 289 | if (nla_strcmp(tb[NFCTH_POLICY_NAME], policy->name)) |
| 290 | return -EBUSY; |
| 291 | |
| 292 | new_policy->max_expected = |
| 293 | ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_MAX])); |
| 294 | new_policy->timeout = |
| 295 | ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_TIMEOUT])); |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static int nfnl_cthelper_update_policy_all(struct nlattr *tb[], |
| 301 | struct nf_conntrack_helper *helper) |
| 302 | { |
| 303 | struct nf_conntrack_expect_policy new_policy[helper->expect_class_max + 1]; |
| 304 | struct nf_conntrack_expect_policy *policy; |
| 305 | int i, err; |
| 306 | |
| 307 | /* Check first that all policy attributes are well-formed, so we don't |
| 308 | * leave things in inconsistent state on errors. |
| 309 | */ |
| 310 | for (i = 0; i < helper->expect_class_max + 1; i++) { |
| 311 | |
| 312 | if (!tb[NFCTH_POLICY_SET + i]) |
| 313 | return -EINVAL; |
| 314 | |
| 315 | err = nfnl_cthelper_update_policy_one(&helper->expect_policy[i], |
| 316 | &new_policy[i], |
| 317 | tb[NFCTH_POLICY_SET + i]); |
| 318 | if (err < 0) |
| 319 | return err; |
| 320 | } |
| 321 | /* Now we can safely update them. */ |
| 322 | for (i = 0; i < helper->expect_class_max + 1; i++) { |
| 323 | policy = (struct nf_conntrack_expect_policy *) |
| 324 | &helper->expect_policy[i]; |
| 325 | policy->max_expected = new_policy->max_expected; |
| 326 | policy->timeout = new_policy->timeout; |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int nfnl_cthelper_update_policy(struct nf_conntrack_helper *helper, |
| 333 | const struct nlattr *attr) |
| 334 | { |
| 335 | struct nlattr *tb[NFCTH_POLICY_SET_MAX + 1]; |
| 336 | unsigned int class_max; |
| 337 | int err; |
| 338 | |
| 339 | err = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr, |
| 340 | nfnl_cthelper_expect_policy_set); |
| 341 | if (err < 0) |
| 342 | return err; |
| 343 | |
| 344 | if (!tb[NFCTH_POLICY_SET_NUM]) |
| 345 | return -EINVAL; |
| 346 | |
| 347 | class_max = ntohl(nla_get_be32(tb[NFCTH_POLICY_SET_NUM])); |
| 348 | if (helper->expect_class_max + 1 != class_max) |
| 349 | return -EBUSY; |
| 350 | |
| 351 | return nfnl_cthelper_update_policy_all(tb, helper); |
| 352 | } |
| 353 | |
| 354 | static int |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 355 | nfnl_cthelper_update(const struct nlattr * const tb[], |
| 356 | struct nf_conntrack_helper *helper) |
| 357 | { |
| 358 | int ret; |
| 359 | |
| 360 | if (tb[NFCTH_PRIV_DATA_LEN]) |
| 361 | return -EBUSY; |
| 362 | |
| 363 | if (tb[NFCTH_POLICY]) { |
Pablo Neira Ayuso | ec38fb4 | 2017-03-21 13:32:37 +0100 | [diff] [blame] | 364 | ret = nfnl_cthelper_update_policy(helper, tb[NFCTH_POLICY]); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 365 | if (ret < 0) |
| 366 | return ret; |
| 367 | } |
| 368 | if (tb[NFCTH_QUEUE_NUM]) |
| 369 | helper->queue_num = ntohl(nla_get_be32(tb[NFCTH_QUEUE_NUM])); |
| 370 | |
| 371 | if (tb[NFCTH_STATUS]) { |
| 372 | int status = ntohl(nla_get_be32(tb[NFCTH_STATUS])); |
| 373 | |
| 374 | switch(status) { |
| 375 | case NFCT_HELPER_STATUS_ENABLED: |
| 376 | helper->flags |= NF_CT_HELPER_F_CONFIGURED; |
| 377 | break; |
| 378 | case NFCT_HELPER_STATUS_DISABLED: |
| 379 | helper->flags &= ~NF_CT_HELPER_F_CONFIGURED; |
| 380 | break; |
| 381 | } |
| 382 | } |
| 383 | return 0; |
| 384 | } |
| 385 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 386 | static int nfnl_cthelper_new(struct net *net, struct sock *nfnl, |
| 387 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 388 | const struct nlattr * const tb[]) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 389 | { |
| 390 | const char *helper_name; |
| 391 | struct nf_conntrack_helper *cur, *helper = NULL; |
| 392 | struct nf_conntrack_tuple tuple; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 393 | struct nfnl_cthelper *nlcth; |
| 394 | int ret = 0; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 395 | |
Kevin Cernekee | 2c3184e | 2017-12-03 12:12:45 -0800 | [diff] [blame] | 396 | if (!capable(CAP_NET_ADMIN)) |
| 397 | return -EPERM; |
| 398 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 399 | if (!tb[NFCTH_NAME] || !tb[NFCTH_TUPLE]) |
| 400 | return -EINVAL; |
| 401 | |
| 402 | helper_name = nla_data(tb[NFCTH_NAME]); |
| 403 | |
| 404 | ret = nfnl_cthelper_parse_tuple(&tuple, tb[NFCTH_TUPLE]); |
| 405 | if (ret < 0) |
| 406 | return ret; |
| 407 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 408 | list_for_each_entry(nlcth, &nfnl_cthelper_list, list) { |
| 409 | cur = &nlcth->helper; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 410 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 411 | if (strncmp(cur->name, helper_name, NF_CT_HELPER_NAME_LEN)) |
| 412 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 413 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 414 | if ((tuple.src.l3num != cur->tuple.src.l3num || |
| 415 | tuple.dst.protonum != cur->tuple.dst.protonum)) |
| 416 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 417 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 418 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 419 | return -EEXIST; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 420 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 421 | helper = cur; |
| 422 | break; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 423 | } |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 424 | |
| 425 | if (helper == NULL) |
| 426 | ret = nfnl_cthelper_create(tb, &tuple); |
| 427 | else |
| 428 | ret = nfnl_cthelper_update(tb, helper); |
| 429 | |
| 430 | return ret; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | static int |
| 434 | nfnl_cthelper_dump_tuple(struct sk_buff *skb, |
| 435 | struct nf_conntrack_helper *helper) |
| 436 | { |
| 437 | struct nlattr *nest_parms; |
| 438 | |
| 439 | nest_parms = nla_nest_start(skb, NFCTH_TUPLE | NLA_F_NESTED); |
| 440 | if (nest_parms == NULL) |
| 441 | goto nla_put_failure; |
| 442 | |
| 443 | if (nla_put_be16(skb, NFCTH_TUPLE_L3PROTONUM, |
| 444 | htons(helper->tuple.src.l3num))) |
| 445 | goto nla_put_failure; |
| 446 | |
| 447 | if (nla_put_u8(skb, NFCTH_TUPLE_L4PROTONUM, helper->tuple.dst.protonum)) |
| 448 | goto nla_put_failure; |
| 449 | |
| 450 | nla_nest_end(skb, nest_parms); |
| 451 | return 0; |
| 452 | |
| 453 | nla_put_failure: |
| 454 | return -1; |
| 455 | } |
| 456 | |
| 457 | static int |
| 458 | nfnl_cthelper_dump_policy(struct sk_buff *skb, |
| 459 | struct nf_conntrack_helper *helper) |
| 460 | { |
| 461 | int i; |
| 462 | struct nlattr *nest_parms1, *nest_parms2; |
| 463 | |
| 464 | nest_parms1 = nla_nest_start(skb, NFCTH_POLICY | NLA_F_NESTED); |
| 465 | if (nest_parms1 == NULL) |
| 466 | goto nla_put_failure; |
| 467 | |
| 468 | if (nla_put_be32(skb, NFCTH_POLICY_SET_NUM, |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 469 | htonl(helper->expect_class_max + 1))) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 470 | goto nla_put_failure; |
| 471 | |
Liping Zhang | cd402b8 | 2017-03-19 22:35:59 +0800 | [diff] [blame] | 472 | for (i = 0; i < helper->expect_class_max + 1; i++) { |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 473 | nest_parms2 = nla_nest_start(skb, |
| 474 | (NFCTH_POLICY_SET+i) | NLA_F_NESTED); |
| 475 | if (nest_parms2 == NULL) |
| 476 | goto nla_put_failure; |
| 477 | |
| 478 | if (nla_put_string(skb, NFCTH_POLICY_NAME, |
| 479 | helper->expect_policy[i].name)) |
| 480 | goto nla_put_failure; |
| 481 | |
| 482 | if (nla_put_be32(skb, NFCTH_POLICY_EXPECT_MAX, |
| 483 | htonl(helper->expect_policy[i].max_expected))) |
| 484 | goto nla_put_failure; |
| 485 | |
| 486 | if (nla_put_be32(skb, NFCTH_POLICY_EXPECT_TIMEOUT, |
| 487 | htonl(helper->expect_policy[i].timeout))) |
| 488 | goto nla_put_failure; |
| 489 | |
| 490 | nla_nest_end(skb, nest_parms2); |
| 491 | } |
| 492 | nla_nest_end(skb, nest_parms1); |
| 493 | return 0; |
| 494 | |
| 495 | nla_put_failure: |
| 496 | return -1; |
| 497 | } |
| 498 | |
| 499 | static int |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 500 | nfnl_cthelper_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 501 | int event, struct nf_conntrack_helper *helper) |
| 502 | { |
| 503 | struct nlmsghdr *nlh; |
| 504 | struct nfgenmsg *nfmsg; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 505 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 506 | int status; |
| 507 | |
| 508 | event |= NFNL_SUBSYS_CTHELPER << 8; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 509 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 510 | if (nlh == NULL) |
| 511 | goto nlmsg_failure; |
| 512 | |
| 513 | nfmsg = nlmsg_data(nlh); |
| 514 | nfmsg->nfgen_family = AF_UNSPEC; |
| 515 | nfmsg->version = NFNETLINK_V0; |
| 516 | nfmsg->res_id = 0; |
| 517 | |
| 518 | if (nla_put_string(skb, NFCTH_NAME, helper->name)) |
| 519 | goto nla_put_failure; |
| 520 | |
| 521 | if (nla_put_be32(skb, NFCTH_QUEUE_NUM, htonl(helper->queue_num))) |
| 522 | goto nla_put_failure; |
| 523 | |
| 524 | if (nfnl_cthelper_dump_tuple(skb, helper) < 0) |
| 525 | goto nla_put_failure; |
| 526 | |
| 527 | if (nfnl_cthelper_dump_policy(skb, helper) < 0) |
| 528 | goto nla_put_failure; |
| 529 | |
| 530 | if (nla_put_be32(skb, NFCTH_PRIV_DATA_LEN, htonl(helper->data_len))) |
| 531 | goto nla_put_failure; |
| 532 | |
| 533 | if (helper->flags & NF_CT_HELPER_F_CONFIGURED) |
| 534 | status = NFCT_HELPER_STATUS_ENABLED; |
| 535 | else |
| 536 | status = NFCT_HELPER_STATUS_DISABLED; |
| 537 | |
| 538 | if (nla_put_be32(skb, NFCTH_STATUS, htonl(status))) |
| 539 | goto nla_put_failure; |
| 540 | |
| 541 | nlmsg_end(skb, nlh); |
| 542 | return skb->len; |
| 543 | |
| 544 | nlmsg_failure: |
| 545 | nla_put_failure: |
| 546 | nlmsg_cancel(skb, nlh); |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | static int |
| 551 | nfnl_cthelper_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 552 | { |
| 553 | struct nf_conntrack_helper *cur, *last; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 554 | |
| 555 | rcu_read_lock(); |
| 556 | last = (struct nf_conntrack_helper *)cb->args[1]; |
| 557 | for (; cb->args[0] < nf_ct_helper_hsize; cb->args[0]++) { |
| 558 | restart: |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 559 | hlist_for_each_entry_rcu(cur, |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 560 | &nf_ct_helper_hash[cb->args[0]], hnode) { |
| 561 | |
| 562 | /* skip non-userspace conntrack helpers. */ |
| 563 | if (!(cur->flags & NF_CT_HELPER_F_USERSPACE)) |
| 564 | continue; |
| 565 | |
| 566 | if (cb->args[1]) { |
| 567 | if (cur != last) |
| 568 | continue; |
| 569 | cb->args[1] = 0; |
| 570 | } |
| 571 | if (nfnl_cthelper_fill_info(skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 572 | NETLINK_CB(cb->skb).portid, |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 573 | cb->nlh->nlmsg_seq, |
| 574 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
| 575 | NFNL_MSG_CTHELPER_NEW, cur) < 0) { |
| 576 | cb->args[1] = (unsigned long)cur; |
| 577 | goto out; |
| 578 | } |
| 579 | } |
| 580 | } |
| 581 | if (cb->args[1]) { |
| 582 | cb->args[1] = 0; |
| 583 | goto restart; |
| 584 | } |
| 585 | out: |
| 586 | rcu_read_unlock(); |
| 587 | return skb->len; |
| 588 | } |
| 589 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 590 | static int nfnl_cthelper_get(struct net *net, struct sock *nfnl, |
| 591 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 592 | const struct nlattr * const tb[]) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 593 | { |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 594 | int ret = -ENOENT; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 595 | struct nf_conntrack_helper *cur; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 596 | struct sk_buff *skb2; |
| 597 | char *helper_name = NULL; |
| 598 | struct nf_conntrack_tuple tuple; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 599 | struct nfnl_cthelper *nlcth; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 600 | bool tuple_set = false; |
| 601 | |
Kevin Cernekee | 2c3184e | 2017-12-03 12:12:45 -0800 | [diff] [blame] | 602 | if (!capable(CAP_NET_ADMIN)) |
| 603 | return -EPERM; |
| 604 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 605 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 606 | struct netlink_dump_control c = { |
| 607 | .dump = nfnl_cthelper_dump_table, |
| 608 | }; |
| 609 | return netlink_dump_start(nfnl, skb, nlh, &c); |
| 610 | } |
| 611 | |
| 612 | if (tb[NFCTH_NAME]) |
| 613 | helper_name = nla_data(tb[NFCTH_NAME]); |
| 614 | |
| 615 | if (tb[NFCTH_TUPLE]) { |
| 616 | ret = nfnl_cthelper_parse_tuple(&tuple, tb[NFCTH_TUPLE]); |
| 617 | if (ret < 0) |
| 618 | return ret; |
| 619 | |
| 620 | tuple_set = true; |
| 621 | } |
| 622 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 623 | list_for_each_entry(nlcth, &nfnl_cthelper_list, list) { |
| 624 | cur = &nlcth->helper; |
| 625 | if (helper_name && |
| 626 | strncmp(cur->name, helper_name, NF_CT_HELPER_NAME_LEN)) |
| 627 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 628 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 629 | if (tuple_set && |
| 630 | (tuple.src.l3num != cur->tuple.src.l3num || |
| 631 | tuple.dst.protonum != cur->tuple.dst.protonum)) |
| 632 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 633 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 634 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 635 | if (skb2 == NULL) { |
| 636 | ret = -ENOMEM; |
| 637 | break; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 638 | } |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 639 | |
| 640 | ret = nfnl_cthelper_fill_info(skb2, NETLINK_CB(skb).portid, |
| 641 | nlh->nlmsg_seq, |
| 642 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 643 | NFNL_MSG_CTHELPER_NEW, cur); |
| 644 | if (ret <= 0) { |
| 645 | kfree_skb(skb2); |
| 646 | break; |
| 647 | } |
| 648 | |
| 649 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, |
| 650 | MSG_DONTWAIT); |
| 651 | if (ret > 0) |
| 652 | ret = 0; |
| 653 | |
| 654 | /* this avoids a loop in nfnetlink. */ |
| 655 | return ret == -EAGAIN ? -ENOBUFS : ret; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 656 | } |
| 657 | return ret; |
| 658 | } |
| 659 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 660 | static int nfnl_cthelper_del(struct net *net, struct sock *nfnl, |
| 661 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 662 | const struct nlattr * const tb[]) |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 663 | { |
| 664 | char *helper_name = NULL; |
| 665 | struct nf_conntrack_helper *cur; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 666 | struct nf_conntrack_tuple tuple; |
| 667 | bool tuple_set = false, found = false; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 668 | struct nfnl_cthelper *nlcth, *n; |
| 669 | int j = 0, ret; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 670 | |
Kevin Cernekee | 2c3184e | 2017-12-03 12:12:45 -0800 | [diff] [blame] | 671 | if (!capable(CAP_NET_ADMIN)) |
| 672 | return -EPERM; |
| 673 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 674 | if (tb[NFCTH_NAME]) |
| 675 | helper_name = nla_data(tb[NFCTH_NAME]); |
| 676 | |
| 677 | if (tb[NFCTH_TUPLE]) { |
| 678 | ret = nfnl_cthelper_parse_tuple(&tuple, tb[NFCTH_TUPLE]); |
| 679 | if (ret < 0) |
| 680 | return ret; |
| 681 | |
| 682 | tuple_set = true; |
| 683 | } |
| 684 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 685 | list_for_each_entry_safe(nlcth, n, &nfnl_cthelper_list, list) { |
| 686 | cur = &nlcth->helper; |
| 687 | j++; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 688 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 689 | if (helper_name && |
| 690 | strncmp(cur->name, helper_name, NF_CT_HELPER_NAME_LEN)) |
| 691 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 692 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 693 | if (tuple_set && |
| 694 | (tuple.src.l3num != cur->tuple.src.l3num || |
| 695 | tuple.dst.protonum != cur->tuple.dst.protonum)) |
| 696 | continue; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 697 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 698 | found = true; |
| 699 | nf_conntrack_helper_unregister(cur); |
| 700 | kfree(cur->expect_policy); |
| 701 | |
| 702 | list_del(&nlcth->list); |
| 703 | kfree(nlcth); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 704 | } |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 705 | |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 706 | /* Make sure we return success if we flush and there is no helpers */ |
| 707 | return (found || j == 0) ? 0 : -ENOENT; |
| 708 | } |
| 709 | |
| 710 | static const struct nla_policy nfnl_cthelper_policy[NFCTH_MAX+1] = { |
| 711 | [NFCTH_NAME] = { .type = NLA_NUL_STRING, |
| 712 | .len = NF_CT_HELPER_NAME_LEN-1 }, |
| 713 | [NFCTH_QUEUE_NUM] = { .type = NLA_U32, }, |
| 714 | }; |
| 715 | |
| 716 | static const struct nfnl_callback nfnl_cthelper_cb[NFNL_MSG_CTHELPER_MAX] = { |
| 717 | [NFNL_MSG_CTHELPER_NEW] = { .call = nfnl_cthelper_new, |
| 718 | .attr_count = NFCTH_MAX, |
| 719 | .policy = nfnl_cthelper_policy }, |
| 720 | [NFNL_MSG_CTHELPER_GET] = { .call = nfnl_cthelper_get, |
| 721 | .attr_count = NFCTH_MAX, |
| 722 | .policy = nfnl_cthelper_policy }, |
| 723 | [NFNL_MSG_CTHELPER_DEL] = { .call = nfnl_cthelper_del, |
| 724 | .attr_count = NFCTH_MAX, |
| 725 | .policy = nfnl_cthelper_policy }, |
| 726 | }; |
| 727 | |
| 728 | static const struct nfnetlink_subsystem nfnl_cthelper_subsys = { |
| 729 | .name = "cthelper", |
| 730 | .subsys_id = NFNL_SUBSYS_CTHELPER, |
| 731 | .cb_count = NFNL_MSG_CTHELPER_MAX, |
| 732 | .cb = nfnl_cthelper_cb, |
| 733 | }; |
| 734 | |
| 735 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTHELPER); |
| 736 | |
| 737 | static int __init nfnl_cthelper_init(void) |
| 738 | { |
| 739 | int ret; |
| 740 | |
| 741 | ret = nfnetlink_subsys_register(&nfnl_cthelper_subsys); |
| 742 | if (ret < 0) { |
| 743 | pr_err("nfnl_cthelper: cannot register with nfnetlink.\n"); |
| 744 | goto err_out; |
| 745 | } |
| 746 | return 0; |
| 747 | err_out: |
| 748 | return ret; |
| 749 | } |
| 750 | |
| 751 | static void __exit nfnl_cthelper_exit(void) |
| 752 | { |
| 753 | struct nf_conntrack_helper *cur; |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 754 | struct nfnl_cthelper *nlcth, *n; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 755 | |
| 756 | nfnetlink_subsys_unregister(&nfnl_cthelper_subsys); |
| 757 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 758 | list_for_each_entry_safe(nlcth, n, &nfnl_cthelper_list, list) { |
| 759 | cur = &nlcth->helper; |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 760 | |
Liping Zhang | 01060ac | 2017-03-25 12:09:15 +0800 | [diff] [blame] | 761 | nf_conntrack_helper_unregister(cur); |
| 762 | kfree(cur->expect_policy); |
| 763 | kfree(nlcth); |
Pablo Neira Ayuso | 12f7a50 | 2012-05-13 21:44:54 +0200 | [diff] [blame] | 764 | } |
| 765 | } |
| 766 | |
| 767 | module_init(nfnl_cthelper_init); |
| 768 | module_exit(nfnl_cthelper_exit); |