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 const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { |
Florian Westphal | e93b5f9 | 2012-11-21 01:37:38 +0000 | [diff] [blame] | 42 | [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING, |
| 43 | .len = CTNL_TIMEOUT_NAME_MAX - 1}, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 44 | [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, |
| 45 | [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, |
| 46 | [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, |
| 47 | }; |
| 48 | |
| 49 | static int |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 50 | ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto, |
| 51 | struct net *net, const struct nlattr *attr) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 52 | { |
| 53 | int ret = 0; |
| 54 | |
| 55 | if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) { |
| 56 | struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1]; |
| 57 | |
Daniel Borkmann | 130ffbc | 2013-06-12 17:54:51 +0200 | [diff] [blame] | 58 | ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, |
| 59 | attr, l4proto->ctnl_timeout.nla_policy); |
| 60 | if (ret < 0) |
| 61 | return ret; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 62 | |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 63 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 64 | } |
| 65 | return ret; |
| 66 | } |
| 67 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 68 | static int cttimeout_new_timeout(struct net *net, struct sock *ctnl, |
| 69 | struct sk_buff *skb, |
| 70 | const struct nlmsghdr *nlh, |
| 71 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 72 | { |
| 73 | __u16 l3num; |
| 74 | __u8 l4num; |
| 75 | struct nf_conntrack_l4proto *l4proto; |
| 76 | struct ctnl_timeout *timeout, *matching = NULL; |
| 77 | char *name; |
| 78 | int ret; |
| 79 | |
| 80 | if (!cda[CTA_TIMEOUT_NAME] || |
| 81 | !cda[CTA_TIMEOUT_L3PROTO] || |
| 82 | !cda[CTA_TIMEOUT_L4PROTO] || |
| 83 | !cda[CTA_TIMEOUT_DATA]) |
| 84 | return -EINVAL; |
| 85 | |
| 86 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 87 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 88 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 89 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 90 | list_for_each_entry(timeout, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 91 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 92 | continue; |
| 93 | |
| 94 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 95 | return -EEXIST; |
| 96 | |
| 97 | matching = timeout; |
| 98 | break; |
| 99 | } |
| 100 | |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 101 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 102 | |
| 103 | /* This protocol is not supportted, skip. */ |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 104 | if (l4proto->l4proto != l4num) { |
| 105 | ret = -EOPNOTSUPP; |
| 106 | goto err_proto_put; |
| 107 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 108 | |
| 109 | if (matching) { |
| 110 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| 111 | /* You cannot replace one timeout policy by another of |
| 112 | * different kind, sorry. |
| 113 | */ |
| 114 | if (matching->l3num != l3num || |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 115 | matching->l4proto->l4proto != l4num) { |
| 116 | ret = -EINVAL; |
| 117 | goto err_proto_put; |
| 118 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 119 | |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 120 | ret = ctnl_timeout_parse_policy(&matching->data, |
| 121 | l4proto, net, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 122 | cda[CTA_TIMEOUT_DATA]); |
| 123 | return ret; |
| 124 | } |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 125 | ret = -EBUSY; |
| 126 | goto err_proto_put; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | timeout = kzalloc(sizeof(struct ctnl_timeout) + |
| 130 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 131 | if (timeout == NULL) { |
| 132 | ret = -ENOMEM; |
| 133 | goto err_proto_put; |
| 134 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 135 | |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 136 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 137 | cda[CTA_TIMEOUT_DATA]); |
| 138 | if (ret < 0) |
| 139 | goto err; |
| 140 | |
| 141 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); |
| 142 | timeout->l3num = l3num; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 143 | timeout->l4proto = l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 144 | atomic_set(&timeout->refcnt, 1); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 145 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 146 | |
| 147 | return 0; |
| 148 | err: |
| 149 | kfree(timeout); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 150 | err_proto_put: |
| 151 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static int |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 156 | 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] | 157 | int event, struct ctnl_timeout *timeout) |
| 158 | { |
| 159 | struct nlmsghdr *nlh; |
| 160 | struct nfgenmsg *nfmsg; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 161 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 162 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 163 | |
| 164 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 165 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 166 | if (nlh == NULL) |
| 167 | goto nlmsg_failure; |
| 168 | |
| 169 | nfmsg = nlmsg_data(nlh); |
| 170 | nfmsg->nfgen_family = AF_UNSPEC; |
| 171 | nfmsg->version = NFNETLINK_V0; |
| 172 | nfmsg->res_id = 0; |
| 173 | |
David S. Miller | 48f03bd | 2012-04-01 18:46:00 -0400 | [diff] [blame] | 174 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
| 175 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || |
| 176 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || |
| 177 | nla_put_be32(skb, CTA_TIMEOUT_USE, |
| 178 | htonl(atomic_read(&timeout->refcnt)))) |
| 179 | goto nla_put_failure; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 180 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 181 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
| 182 | struct nlattr *nest_parms; |
| 183 | int ret; |
| 184 | |
| 185 | nest_parms = nla_nest_start(skb, |
| 186 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
| 187 | if (!nest_parms) |
| 188 | goto nla_put_failure; |
| 189 | |
| 190 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); |
| 191 | if (ret < 0) |
| 192 | goto nla_put_failure; |
| 193 | |
| 194 | nla_nest_end(skb, nest_parms); |
| 195 | } |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 196 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 197 | nlmsg_end(skb, nlh); |
| 198 | return skb->len; |
| 199 | |
| 200 | nlmsg_failure: |
| 201 | nla_put_failure: |
| 202 | nlmsg_cancel(skb, nlh); |
| 203 | return -1; |
| 204 | } |
| 205 | |
| 206 | static int |
| 207 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 208 | { |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 209 | struct net *net = sock_net(skb->sk); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 210 | struct ctnl_timeout *cur, *last; |
| 211 | |
| 212 | if (cb->args[2]) |
| 213 | return 0; |
| 214 | |
| 215 | last = (struct ctnl_timeout *)cb->args[1]; |
| 216 | if (cb->args[1]) |
| 217 | cb->args[1] = 0; |
| 218 | |
| 219 | rcu_read_lock(); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 220 | list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 221 | if (last) { |
| 222 | if (cur != last) |
| 223 | continue; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 224 | |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 225 | last = NULL; |
| 226 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 227 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 228 | cb->nlh->nlmsg_seq, |
| 229 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
| 230 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { |
| 231 | cb->args[1] = (unsigned long)cur; |
| 232 | break; |
| 233 | } |
| 234 | } |
| 235 | if (!cb->args[1]) |
| 236 | cb->args[2] = 1; |
| 237 | rcu_read_unlock(); |
| 238 | return skb->len; |
| 239 | } |
| 240 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 241 | static int cttimeout_get_timeout(struct net *net, struct sock *ctnl, |
| 242 | struct sk_buff *skb, |
| 243 | const struct nlmsghdr *nlh, |
| 244 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 245 | { |
| 246 | int ret = -ENOENT; |
| 247 | char *name; |
| 248 | struct ctnl_timeout *cur; |
| 249 | |
| 250 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 251 | struct netlink_dump_control c = { |
| 252 | .dump = ctnl_timeout_dump, |
| 253 | }; |
| 254 | return netlink_dump_start(ctnl, skb, nlh, &c); |
| 255 | } |
| 256 | |
| 257 | if (!cda[CTA_TIMEOUT_NAME]) |
| 258 | return -EINVAL; |
| 259 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 260 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 261 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 262 | struct sk_buff *skb2; |
| 263 | |
| 264 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 265 | continue; |
| 266 | |
| 267 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 268 | if (skb2 == NULL) { |
| 269 | ret = -ENOMEM; |
| 270 | break; |
| 271 | } |
| 272 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 273 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 274 | nlh->nlmsg_seq, |
| 275 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 276 | IPCTNL_MSG_TIMEOUT_NEW, cur); |
| 277 | if (ret <= 0) { |
| 278 | kfree_skb(skb2); |
| 279 | break; |
| 280 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 281 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 282 | MSG_DONTWAIT); |
| 283 | if (ret > 0) |
| 284 | ret = 0; |
| 285 | |
| 286 | /* this avoids a loop in nfnetlink. */ |
| 287 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 288 | } |
| 289 | return ret; |
| 290 | } |
| 291 | |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 292 | static void untimeout(struct nf_conntrack_tuple_hash *i, |
| 293 | struct ctnl_timeout *timeout) |
| 294 | { |
| 295 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); |
| 296 | struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct); |
| 297 | |
| 298 | if (timeout_ext && (!timeout || timeout_ext->timeout == timeout)) |
| 299 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); |
| 300 | } |
| 301 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 302 | static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 303 | { |
| 304 | struct nf_conntrack_tuple_hash *h; |
| 305 | const struct hlist_nulls_node *nn; |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 306 | unsigned int last_hsize; |
| 307 | spinlock_t *lock; |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 308 | int i; |
| 309 | |
| 310 | local_bh_disable(); |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 311 | restart: |
| 312 | last_hsize = nf_conntrack_htable_size; |
| 313 | for (i = 0; i < last_hsize; i++) { |
| 314 | lock = &nf_conntrack_locks[i % CONNTRACK_LOCKS]; |
| 315 | nf_conntrack_lock(lock); |
| 316 | if (last_hsize != nf_conntrack_htable_size) { |
| 317 | spin_unlock(lock); |
| 318 | goto restart; |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 319 | } |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 320 | |
| 321 | hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) |
| 322 | untimeout(h, timeout); |
| 323 | spin_unlock(lock); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 324 | } |
| 325 | local_bh_enable(); |
| 326 | } |
| 327 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 328 | /* try to delete object, fail if it is still in use. */ |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 329 | static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 330 | { |
| 331 | int ret = 0; |
| 332 | |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 333 | /* We want to avoid races with ctnl_timeout_put. So only when the |
| 334 | * current refcnt is 1, we decrease it to 0. |
| 335 | */ |
| 336 | if (atomic_cmpxchg(&timeout->refcnt, 1, 0) == 1) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 337 | /* We are protected by nfnl mutex. */ |
| 338 | list_del_rcu(&timeout->head); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 339 | nf_ct_l4proto_put(timeout->l4proto); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 340 | ctnl_untimeout(net, timeout); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 341 | kfree_rcu(timeout, rcu_head); |
| 342 | } else { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 343 | ret = -EBUSY; |
| 344 | } |
| 345 | return ret; |
| 346 | } |
| 347 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 348 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
| 349 | struct sk_buff *skb, |
| 350 | const struct nlmsghdr *nlh, |
| 351 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 352 | { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 353 | struct ctnl_timeout *cur; |
| 354 | int ret = -ENOENT; |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 355 | char *name; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 356 | |
| 357 | if (!cda[CTA_TIMEOUT_NAME]) { |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 358 | list_for_each_entry(cur, &net->nfct_timeout_list, head) |
| 359 | ctnl_timeout_try_del(net, cur); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 364 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 365 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 366 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 367 | continue; |
| 368 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 369 | ret = ctnl_timeout_try_del(net, cur); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 370 | if (ret < 0) |
| 371 | return ret; |
| 372 | |
| 373 | break; |
| 374 | } |
| 375 | return ret; |
| 376 | } |
| 377 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 378 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
| 379 | struct sk_buff *skb, |
| 380 | const struct nlmsghdr *nlh, |
| 381 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 382 | { |
| 383 | __u16 l3num; |
| 384 | __u8 l4num; |
| 385 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 386 | unsigned int *timeouts; |
| 387 | int ret; |
| 388 | |
| 389 | if (!cda[CTA_TIMEOUT_L3PROTO] || |
| 390 | !cda[CTA_TIMEOUT_L4PROTO] || |
| 391 | !cda[CTA_TIMEOUT_DATA]) |
| 392 | return -EINVAL; |
| 393 | |
| 394 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 395 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 396 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
| 397 | |
| 398 | /* This protocol is not supported, skip. */ |
| 399 | if (l4proto->l4proto != l4num) { |
| 400 | ret = -EOPNOTSUPP; |
| 401 | goto err; |
| 402 | } |
| 403 | |
| 404 | timeouts = l4proto->get_timeouts(net); |
| 405 | |
| 406 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, |
| 407 | cda[CTA_TIMEOUT_DATA]); |
| 408 | if (ret < 0) |
| 409 | goto err; |
| 410 | |
| 411 | nf_ct_l4proto_put(l4proto); |
| 412 | return 0; |
| 413 | err: |
| 414 | nf_ct_l4proto_put(l4proto); |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | static int |
| 419 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, |
| 420 | u32 seq, u32 type, int event, |
| 421 | struct nf_conntrack_l4proto *l4proto) |
| 422 | { |
| 423 | struct nlmsghdr *nlh; |
| 424 | struct nfgenmsg *nfmsg; |
| 425 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
| 426 | |
| 427 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
| 428 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
| 429 | if (nlh == NULL) |
| 430 | goto nlmsg_failure; |
| 431 | |
| 432 | nfmsg = nlmsg_data(nlh); |
| 433 | nfmsg->nfgen_family = AF_UNSPEC; |
| 434 | nfmsg->version = NFNETLINK_V0; |
| 435 | nfmsg->res_id = 0; |
| 436 | |
| 437 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || |
| 438 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) |
| 439 | goto nla_put_failure; |
| 440 | |
| 441 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
| 442 | struct nlattr *nest_parms; |
| 443 | unsigned int *timeouts = l4proto->get_timeouts(net); |
| 444 | int ret; |
| 445 | |
| 446 | nest_parms = nla_nest_start(skb, |
| 447 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
| 448 | if (!nest_parms) |
| 449 | goto nla_put_failure; |
| 450 | |
| 451 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); |
| 452 | if (ret < 0) |
| 453 | goto nla_put_failure; |
| 454 | |
| 455 | nla_nest_end(skb, nest_parms); |
| 456 | } |
| 457 | |
| 458 | nlmsg_end(skb, nlh); |
| 459 | return skb->len; |
| 460 | |
| 461 | nlmsg_failure: |
| 462 | nla_put_failure: |
| 463 | nlmsg_cancel(skb, nlh); |
| 464 | return -1; |
| 465 | } |
| 466 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 467 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
| 468 | struct sk_buff *skb, |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 469 | const struct nlmsghdr *nlh, |
| 470 | const struct nlattr * const cda[]) |
| 471 | { |
| 472 | __u16 l3num; |
| 473 | __u8 l4num; |
| 474 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 475 | struct sk_buff *skb2; |
| 476 | int ret, err; |
| 477 | |
| 478 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) |
| 479 | return -EINVAL; |
| 480 | |
| 481 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 482 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 483 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
| 484 | |
| 485 | /* This protocol is not supported, skip. */ |
| 486 | if (l4proto->l4proto != l4num) { |
| 487 | err = -EOPNOTSUPP; |
| 488 | goto err; |
| 489 | } |
| 490 | |
| 491 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 492 | if (skb2 == NULL) { |
| 493 | err = -ENOMEM; |
| 494 | goto err; |
| 495 | } |
| 496 | |
| 497 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, |
| 498 | nlh->nlmsg_seq, |
| 499 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 500 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, |
| 501 | l4proto); |
| 502 | if (ret <= 0) { |
| 503 | kfree_skb(skb2); |
| 504 | err = -ENOMEM; |
| 505 | goto err; |
| 506 | } |
| 507 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
| 508 | if (ret > 0) |
| 509 | ret = 0; |
| 510 | |
| 511 | /* this avoids a loop in nfnetlink. */ |
| 512 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 513 | err: |
| 514 | nf_ct_l4proto_put(l4proto); |
| 515 | return err; |
| 516 | } |
| 517 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 518 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 519 | static struct ctnl_timeout * |
| 520 | ctnl_timeout_find_get(struct net *net, const char *name) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 521 | { |
| 522 | struct ctnl_timeout *timeout, *matching = NULL; |
| 523 | |
| 524 | rcu_read_lock(); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 525 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 526 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 527 | continue; |
| 528 | |
| 529 | if (!try_module_get(THIS_MODULE)) |
| 530 | goto err; |
| 531 | |
| 532 | if (!atomic_inc_not_zero(&timeout->refcnt)) { |
| 533 | module_put(THIS_MODULE); |
| 534 | goto err; |
| 535 | } |
| 536 | matching = timeout; |
| 537 | break; |
| 538 | } |
| 539 | err: |
| 540 | rcu_read_unlock(); |
| 541 | return matching; |
| 542 | } |
| 543 | |
| 544 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) |
| 545 | { |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 546 | if (atomic_dec_and_test(&timeout->refcnt)) |
| 547 | kfree_rcu(timeout, rcu_head); |
| 548 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 549 | module_put(THIS_MODULE); |
| 550 | } |
| 551 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
| 552 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 553 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
| 554 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, |
| 555 | .attr_count = CTA_TIMEOUT_MAX, |
| 556 | .policy = cttimeout_nla_policy }, |
| 557 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, |
| 558 | .attr_count = CTA_TIMEOUT_MAX, |
| 559 | .policy = cttimeout_nla_policy }, |
| 560 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, |
| 561 | .attr_count = CTA_TIMEOUT_MAX, |
| 562 | .policy = cttimeout_nla_policy }, |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 563 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
| 564 | .attr_count = CTA_TIMEOUT_MAX, |
| 565 | .policy = cttimeout_nla_policy }, |
| 566 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, |
| 567 | .attr_count = CTA_TIMEOUT_MAX, |
| 568 | .policy = cttimeout_nla_policy }, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 569 | }; |
| 570 | |
| 571 | static const struct nfnetlink_subsystem cttimeout_subsys = { |
| 572 | .name = "conntrack_timeout", |
| 573 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, |
| 574 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, |
| 575 | .cb = cttimeout_cb, |
| 576 | }; |
| 577 | |
| 578 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); |
| 579 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 580 | static int __net_init cttimeout_net_init(struct net *net) |
| 581 | { |
| 582 | INIT_LIST_HEAD(&net->nfct_timeout_list); |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | static void __net_exit cttimeout_net_exit(struct net *net) |
| 588 | { |
| 589 | struct ctnl_timeout *cur, *tmp; |
| 590 | |
| 591 | ctnl_untimeout(net, NULL); |
| 592 | |
| 593 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { |
| 594 | list_del_rcu(&cur->head); |
| 595 | nf_ct_l4proto_put(cur->l4proto); |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 596 | |
| 597 | if (atomic_dec_and_test(&cur->refcnt)) |
| 598 | kfree_rcu(cur, rcu_head); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 599 | } |
| 600 | } |
| 601 | |
| 602 | static struct pernet_operations cttimeout_ops = { |
| 603 | .init = cttimeout_net_init, |
| 604 | .exit = cttimeout_net_exit, |
| 605 | }; |
| 606 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 607 | static int __init cttimeout_init(void) |
| 608 | { |
| 609 | int ret; |
| 610 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 611 | ret = register_pernet_subsys(&cttimeout_ops); |
| 612 | if (ret < 0) |
| 613 | return ret; |
| 614 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 615 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
| 616 | if (ret < 0) { |
| 617 | pr_err("cttimeout_init: cannot register cttimeout with " |
| 618 | "nfnetlink.\n"); |
| 619 | goto err_out; |
| 620 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 621 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 622 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); |
| 623 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); |
| 624 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 625 | return 0; |
| 626 | |
| 627 | err_out: |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 628 | unregister_pernet_subsys(&cttimeout_ops); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | static void __exit cttimeout_exit(void) |
| 633 | { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 634 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
| 635 | |
| 636 | nfnetlink_subsys_unregister(&cttimeout_subsys); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 637 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 638 | unregister_pernet_subsys(&cttimeout_ops); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 639 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 640 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); |
| 641 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); |
| 642 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 4302f5e | 2015-10-05 16:51:02 +0200 | [diff] [blame] | 643 | rcu_barrier(); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | module_init(cttimeout_init); |
| 647 | module_exit(cttimeout_exit); |