Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> |
| 3 | * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> |
| 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 (or any later at your option). |
| 8 | */ |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/rculist.h> |
| 13 | #include <linux/rculist_nulls.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/timer.h> |
| 16 | #include <linux/security.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/netlink.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/slab.h> |
| 23 | |
| 24 | #include <linux/netfilter.h> |
| 25 | #include <net/netlink.h> |
| 26 | #include <net/sock.h> |
| 27 | #include <net/netfilter/nf_conntrack.h> |
| 28 | #include <net/netfilter/nf_conntrack_core.h> |
| 29 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 30 | #include <net/netfilter/nf_conntrack_l4proto.h> |
| 31 | #include <net/netfilter/nf_conntrack_tuple.h> |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 32 | #include <net/netfilter/nf_conntrack_timeout.h> |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 33 | |
| 34 | #include <linux/netfilter/nfnetlink.h> |
| 35 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
| 36 | |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 39 | MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning"); |
| 40 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 41 | static LIST_HEAD(cttimeout_list); |
| 42 | |
| 43 | static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { |
Florian Westphal | e93b5f9 | 2012-11-21 01:37:38 +0000 | [diff] [blame] | 44 | [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING, |
| 45 | .len = CTNL_TIMEOUT_NAME_MAX - 1}, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 46 | [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, |
| 47 | [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, |
| 48 | [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, |
| 49 | }; |
| 50 | |
| 51 | static int |
| 52 | ctnl_timeout_parse_policy(struct ctnl_timeout *timeout, |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 53 | struct nf_conntrack_l4proto *l4proto, |
| 54 | struct net *net, |
| 55 | const struct nlattr *attr) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 56 | { |
| 57 | int ret = 0; |
| 58 | |
| 59 | if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) { |
| 60 | struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1]; |
| 61 | |
| 62 | nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, |
| 63 | attr, l4proto->ctnl_timeout.nla_policy); |
| 64 | |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 65 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, |
| 66 | &timeout->data); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 67 | } |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | static int |
| 72 | cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb, |
| 73 | const struct nlmsghdr *nlh, |
| 74 | const struct nlattr * const cda[]) |
| 75 | { |
| 76 | __u16 l3num; |
| 77 | __u8 l4num; |
| 78 | struct nf_conntrack_l4proto *l4proto; |
| 79 | struct ctnl_timeout *timeout, *matching = NULL; |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 80 | struct net *net = sock_net(skb->sk); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 81 | char *name; |
| 82 | int ret; |
| 83 | |
| 84 | if (!cda[CTA_TIMEOUT_NAME] || |
| 85 | !cda[CTA_TIMEOUT_L3PROTO] || |
| 86 | !cda[CTA_TIMEOUT_L4PROTO] || |
| 87 | !cda[CTA_TIMEOUT_DATA]) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 91 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 92 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 93 | |
| 94 | list_for_each_entry(timeout, &cttimeout_list, head) { |
| 95 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 96 | continue; |
| 97 | |
| 98 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 99 | return -EEXIST; |
| 100 | |
| 101 | matching = timeout; |
| 102 | break; |
| 103 | } |
| 104 | |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 105 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 106 | |
| 107 | /* This protocol is not supportted, skip. */ |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 108 | if (l4proto->l4proto != l4num) { |
| 109 | ret = -EOPNOTSUPP; |
| 110 | goto err_proto_put; |
| 111 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 112 | |
| 113 | if (matching) { |
| 114 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| 115 | /* You cannot replace one timeout policy by another of |
| 116 | * different kind, sorry. |
| 117 | */ |
| 118 | if (matching->l3num != l3num || |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 119 | matching->l4proto->l4proto != l4num) { |
| 120 | ret = -EINVAL; |
| 121 | goto err_proto_put; |
| 122 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 123 | |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 124 | ret = ctnl_timeout_parse_policy(matching, l4proto, net, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 125 | cda[CTA_TIMEOUT_DATA]); |
| 126 | return ret; |
| 127 | } |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 128 | ret = -EBUSY; |
| 129 | goto err_proto_put; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | timeout = kzalloc(sizeof(struct ctnl_timeout) + |
| 133 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 134 | if (timeout == NULL) { |
| 135 | ret = -ENOMEM; |
| 136 | goto err_proto_put; |
| 137 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 138 | |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 139 | ret = ctnl_timeout_parse_policy(timeout, l4proto, net, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 140 | cda[CTA_TIMEOUT_DATA]); |
| 141 | if (ret < 0) |
| 142 | goto err; |
| 143 | |
| 144 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); |
| 145 | timeout->l3num = l3num; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 146 | timeout->l4proto = l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 147 | atomic_set(&timeout->refcnt, 1); |
| 148 | list_add_tail_rcu(&timeout->head, &cttimeout_list); |
| 149 | |
| 150 | return 0; |
| 151 | err: |
| 152 | kfree(timeout); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 153 | err_proto_put: |
| 154 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | static int |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 159 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 160 | int event, struct ctnl_timeout *timeout) |
| 161 | { |
| 162 | struct nlmsghdr *nlh; |
| 163 | struct nfgenmsg *nfmsg; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 164 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 165 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 166 | |
| 167 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 168 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 169 | if (nlh == NULL) |
| 170 | goto nlmsg_failure; |
| 171 | |
| 172 | nfmsg = nlmsg_data(nlh); |
| 173 | nfmsg->nfgen_family = AF_UNSPEC; |
| 174 | nfmsg->version = NFNETLINK_V0; |
| 175 | nfmsg->res_id = 0; |
| 176 | |
David S. Miller | 48f03bd | 2012-04-01 18:46:00 -0400 | [diff] [blame] | 177 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
| 178 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || |
| 179 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || |
| 180 | nla_put_be32(skb, CTA_TIMEOUT_USE, |
| 181 | htonl(atomic_read(&timeout->refcnt)))) |
| 182 | goto nla_put_failure; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 183 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 184 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
| 185 | struct nlattr *nest_parms; |
| 186 | int ret; |
| 187 | |
| 188 | nest_parms = nla_nest_start(skb, |
| 189 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
| 190 | if (!nest_parms) |
| 191 | goto nla_put_failure; |
| 192 | |
| 193 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); |
| 194 | if (ret < 0) |
| 195 | goto nla_put_failure; |
| 196 | |
| 197 | nla_nest_end(skb, nest_parms); |
| 198 | } |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 199 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 200 | nlmsg_end(skb, nlh); |
| 201 | return skb->len; |
| 202 | |
| 203 | nlmsg_failure: |
| 204 | nla_put_failure: |
| 205 | nlmsg_cancel(skb, nlh); |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | static int |
| 210 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 211 | { |
| 212 | struct ctnl_timeout *cur, *last; |
| 213 | |
| 214 | if (cb->args[2]) |
| 215 | return 0; |
| 216 | |
| 217 | last = (struct ctnl_timeout *)cb->args[1]; |
| 218 | if (cb->args[1]) |
| 219 | cb->args[1] = 0; |
| 220 | |
| 221 | rcu_read_lock(); |
| 222 | list_for_each_entry_rcu(cur, &cttimeout_list, head) { |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 223 | if (last) { |
| 224 | if (cur != last) |
| 225 | continue; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 226 | |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 227 | last = NULL; |
| 228 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 229 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 230 | cb->nlh->nlmsg_seq, |
| 231 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
| 232 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { |
| 233 | cb->args[1] = (unsigned long)cur; |
| 234 | break; |
| 235 | } |
| 236 | } |
| 237 | if (!cb->args[1]) |
| 238 | cb->args[2] = 1; |
| 239 | rcu_read_unlock(); |
| 240 | return skb->len; |
| 241 | } |
| 242 | |
| 243 | static int |
| 244 | cttimeout_get_timeout(struct sock *ctnl, struct sk_buff *skb, |
| 245 | const struct nlmsghdr *nlh, |
| 246 | const struct nlattr * const cda[]) |
| 247 | { |
| 248 | int ret = -ENOENT; |
| 249 | char *name; |
| 250 | struct ctnl_timeout *cur; |
| 251 | |
| 252 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 253 | struct netlink_dump_control c = { |
| 254 | .dump = ctnl_timeout_dump, |
| 255 | }; |
| 256 | return netlink_dump_start(ctnl, skb, nlh, &c); |
| 257 | } |
| 258 | |
| 259 | if (!cda[CTA_TIMEOUT_NAME]) |
| 260 | return -EINVAL; |
| 261 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 262 | |
| 263 | list_for_each_entry(cur, &cttimeout_list, head) { |
| 264 | struct sk_buff *skb2; |
| 265 | |
| 266 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 267 | continue; |
| 268 | |
| 269 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 270 | if (skb2 == NULL) { |
| 271 | ret = -ENOMEM; |
| 272 | break; |
| 273 | } |
| 274 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 275 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 276 | nlh->nlmsg_seq, |
| 277 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 278 | IPCTNL_MSG_TIMEOUT_NEW, cur); |
| 279 | if (ret <= 0) { |
| 280 | kfree_skb(skb2); |
| 281 | break; |
| 282 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 283 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 284 | MSG_DONTWAIT); |
| 285 | if (ret > 0) |
| 286 | ret = 0; |
| 287 | |
| 288 | /* this avoids a loop in nfnetlink. */ |
| 289 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 290 | } |
| 291 | return ret; |
| 292 | } |
| 293 | |
| 294 | /* try to delete object, fail if it is still in use. */ |
| 295 | static int ctnl_timeout_try_del(struct ctnl_timeout *timeout) |
| 296 | { |
| 297 | int ret = 0; |
| 298 | |
| 299 | /* we want to avoid races with nf_ct_timeout_find_get. */ |
| 300 | if (atomic_dec_and_test(&timeout->refcnt)) { |
| 301 | /* We are protected by nfnl mutex. */ |
| 302 | list_del_rcu(&timeout->head); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 303 | nf_ct_l4proto_put(timeout->l4proto); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 304 | kfree_rcu(timeout, rcu_head); |
| 305 | } else { |
| 306 | /* still in use, restore reference counter. */ |
| 307 | atomic_inc(&timeout->refcnt); |
| 308 | ret = -EBUSY; |
| 309 | } |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | static int |
| 314 | cttimeout_del_timeout(struct sock *ctnl, struct sk_buff *skb, |
| 315 | const struct nlmsghdr *nlh, |
| 316 | const struct nlattr * const cda[]) |
| 317 | { |
| 318 | char *name; |
| 319 | struct ctnl_timeout *cur; |
| 320 | int ret = -ENOENT; |
| 321 | |
| 322 | if (!cda[CTA_TIMEOUT_NAME]) { |
| 323 | list_for_each_entry(cur, &cttimeout_list, head) |
| 324 | ctnl_timeout_try_del(cur); |
| 325 | |
| 326 | return 0; |
| 327 | } |
| 328 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 329 | |
| 330 | list_for_each_entry(cur, &cttimeout_list, head) { |
| 331 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 332 | continue; |
| 333 | |
| 334 | ret = ctnl_timeout_try_del(cur); |
| 335 | if (ret < 0) |
| 336 | return ret; |
| 337 | |
| 338 | break; |
| 339 | } |
| 340 | return ret; |
| 341 | } |
| 342 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 343 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 344 | static struct ctnl_timeout *ctnl_timeout_find_get(const char *name) |
| 345 | { |
| 346 | struct ctnl_timeout *timeout, *matching = NULL; |
| 347 | |
| 348 | rcu_read_lock(); |
| 349 | list_for_each_entry_rcu(timeout, &cttimeout_list, head) { |
| 350 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 351 | continue; |
| 352 | |
| 353 | if (!try_module_get(THIS_MODULE)) |
| 354 | goto err; |
| 355 | |
| 356 | if (!atomic_inc_not_zero(&timeout->refcnt)) { |
| 357 | module_put(THIS_MODULE); |
| 358 | goto err; |
| 359 | } |
| 360 | matching = timeout; |
| 361 | break; |
| 362 | } |
| 363 | err: |
| 364 | rcu_read_unlock(); |
| 365 | return matching; |
| 366 | } |
| 367 | |
| 368 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) |
| 369 | { |
| 370 | atomic_dec(&timeout->refcnt); |
| 371 | module_put(THIS_MODULE); |
| 372 | } |
| 373 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
| 374 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 375 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
| 376 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, |
| 377 | .attr_count = CTA_TIMEOUT_MAX, |
| 378 | .policy = cttimeout_nla_policy }, |
| 379 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, |
| 380 | .attr_count = CTA_TIMEOUT_MAX, |
| 381 | .policy = cttimeout_nla_policy }, |
| 382 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, |
| 383 | .attr_count = CTA_TIMEOUT_MAX, |
| 384 | .policy = cttimeout_nla_policy }, |
| 385 | }; |
| 386 | |
| 387 | static const struct nfnetlink_subsystem cttimeout_subsys = { |
| 388 | .name = "conntrack_timeout", |
| 389 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, |
| 390 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, |
| 391 | .cb = cttimeout_cb, |
| 392 | }; |
| 393 | |
| 394 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); |
| 395 | |
| 396 | static int __init cttimeout_init(void) |
| 397 | { |
| 398 | int ret; |
| 399 | |
| 400 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
| 401 | if (ret < 0) { |
| 402 | pr_err("cttimeout_init: cannot register cttimeout with " |
| 403 | "nfnetlink.\n"); |
| 404 | goto err_out; |
| 405 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 406 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 407 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); |
| 408 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); |
| 409 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 410 | return 0; |
| 411 | |
| 412 | err_out: |
| 413 | return ret; |
| 414 | } |
| 415 | |
| 416 | static void __exit cttimeout_exit(void) |
| 417 | { |
| 418 | struct ctnl_timeout *cur, *tmp; |
| 419 | |
| 420 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
| 421 | |
| 422 | nfnetlink_subsys_unregister(&cttimeout_subsys); |
| 423 | list_for_each_entry_safe(cur, tmp, &cttimeout_list, head) { |
| 424 | list_del_rcu(&cur->head); |
| 425 | /* We are sure that our objects have no clients at this point, |
| 426 | * it's safe to release them all without checking refcnt. |
| 427 | */ |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 428 | nf_ct_l4proto_put(cur->l4proto); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 429 | kfree_rcu(cur, rcu_head); |
| 430 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 431 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 432 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); |
| 433 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); |
| 434 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | module_init(cttimeout_init); |
| 438 | module_exit(cttimeout_exit); |