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 | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 101 | if (matching) { |
| 102 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| 103 | /* You cannot replace one timeout policy by another of |
| 104 | * different kind, sorry. |
| 105 | */ |
| 106 | if (matching->l3num != l3num || |
Liping Zhang | 23aaba5 | 2016-08-22 21:58:17 +0800 | [diff] [blame] | 107 | matching->l4proto->l4proto != l4num) |
| 108 | return -EINVAL; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 109 | |
Liping Zhang | 23aaba5 | 2016-08-22 21:58:17 +0800 | [diff] [blame] | 110 | return ctnl_timeout_parse_policy(&matching->data, |
| 111 | matching->l4proto, net, |
| 112 | cda[CTA_TIMEOUT_DATA]); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 113 | } |
Liping Zhang | 23aaba5 | 2016-08-22 21:58:17 +0800 | [diff] [blame] | 114 | |
| 115 | return -EBUSY; |
| 116 | } |
| 117 | |
| 118 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
| 119 | |
| 120 | /* This protocol is not supportted, skip. */ |
| 121 | if (l4proto->l4proto != l4num) { |
| 122 | ret = -EOPNOTSUPP; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 123 | goto err_proto_put; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | timeout = kzalloc(sizeof(struct ctnl_timeout) + |
| 127 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 128 | if (timeout == NULL) { |
| 129 | ret = -ENOMEM; |
| 130 | goto err_proto_put; |
| 131 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 132 | |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 133 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 134 | cda[CTA_TIMEOUT_DATA]); |
| 135 | if (ret < 0) |
| 136 | goto err; |
| 137 | |
| 138 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); |
| 139 | timeout->l3num = l3num; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 140 | timeout->l4proto = l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 141 | atomic_set(&timeout->refcnt, 1); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 142 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 143 | |
| 144 | return 0; |
| 145 | err: |
| 146 | kfree(timeout); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 147 | err_proto_put: |
| 148 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | static int |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 153 | 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] | 154 | int event, struct ctnl_timeout *timeout) |
| 155 | { |
| 156 | struct nlmsghdr *nlh; |
| 157 | struct nfgenmsg *nfmsg; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 158 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 159 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 160 | |
| 161 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 162 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 163 | if (nlh == NULL) |
| 164 | goto nlmsg_failure; |
| 165 | |
| 166 | nfmsg = nlmsg_data(nlh); |
| 167 | nfmsg->nfgen_family = AF_UNSPEC; |
| 168 | nfmsg->version = NFNETLINK_V0; |
| 169 | nfmsg->res_id = 0; |
| 170 | |
David S. Miller | 48f03bd | 2012-04-01 18:46:00 -0400 | [diff] [blame] | 171 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
| 172 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || |
| 173 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || |
| 174 | nla_put_be32(skb, CTA_TIMEOUT_USE, |
| 175 | htonl(atomic_read(&timeout->refcnt)))) |
| 176 | goto nla_put_failure; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 177 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 178 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
| 179 | struct nlattr *nest_parms; |
| 180 | int ret; |
| 181 | |
| 182 | nest_parms = nla_nest_start(skb, |
| 183 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
| 184 | if (!nest_parms) |
| 185 | goto nla_put_failure; |
| 186 | |
| 187 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); |
| 188 | if (ret < 0) |
| 189 | goto nla_put_failure; |
| 190 | |
| 191 | nla_nest_end(skb, nest_parms); |
| 192 | } |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 193 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 194 | nlmsg_end(skb, nlh); |
| 195 | return skb->len; |
| 196 | |
| 197 | nlmsg_failure: |
| 198 | nla_put_failure: |
| 199 | nlmsg_cancel(skb, nlh); |
| 200 | return -1; |
| 201 | } |
| 202 | |
| 203 | static int |
| 204 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 205 | { |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 206 | struct net *net = sock_net(skb->sk); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 207 | struct ctnl_timeout *cur, *last; |
| 208 | |
| 209 | if (cb->args[2]) |
| 210 | return 0; |
| 211 | |
| 212 | last = (struct ctnl_timeout *)cb->args[1]; |
| 213 | if (cb->args[1]) |
| 214 | cb->args[1] = 0; |
| 215 | |
| 216 | rcu_read_lock(); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 217 | list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 218 | if (last) { |
| 219 | if (cur != last) |
| 220 | continue; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 221 | |
Pablo Neira Ayuso | 37bc4f8 | 2013-06-01 15:36:02 +0200 | [diff] [blame] | 222 | last = NULL; |
| 223 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 224 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 225 | cb->nlh->nlmsg_seq, |
| 226 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
| 227 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { |
| 228 | cb->args[1] = (unsigned long)cur; |
| 229 | break; |
| 230 | } |
| 231 | } |
| 232 | if (!cb->args[1]) |
| 233 | cb->args[2] = 1; |
| 234 | rcu_read_unlock(); |
| 235 | return skb->len; |
| 236 | } |
| 237 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 238 | static int cttimeout_get_timeout(struct net *net, struct sock *ctnl, |
| 239 | struct sk_buff *skb, |
| 240 | const struct nlmsghdr *nlh, |
| 241 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 242 | { |
| 243 | int ret = -ENOENT; |
| 244 | char *name; |
| 245 | struct ctnl_timeout *cur; |
| 246 | |
| 247 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 248 | struct netlink_dump_control c = { |
| 249 | .dump = ctnl_timeout_dump, |
| 250 | }; |
| 251 | return netlink_dump_start(ctnl, skb, nlh, &c); |
| 252 | } |
| 253 | |
| 254 | if (!cda[CTA_TIMEOUT_NAME]) |
| 255 | return -EINVAL; |
| 256 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 257 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 258 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 259 | struct sk_buff *skb2; |
| 260 | |
| 261 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 262 | continue; |
| 263 | |
| 264 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 265 | if (skb2 == NULL) { |
| 266 | ret = -ENOMEM; |
| 267 | break; |
| 268 | } |
| 269 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 270 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 271 | nlh->nlmsg_seq, |
| 272 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 273 | IPCTNL_MSG_TIMEOUT_NEW, cur); |
| 274 | if (ret <= 0) { |
| 275 | kfree_skb(skb2); |
| 276 | break; |
| 277 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 278 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 279 | MSG_DONTWAIT); |
| 280 | if (ret > 0) |
| 281 | ret = 0; |
| 282 | |
| 283 | /* this avoids a loop in nfnetlink. */ |
| 284 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 285 | } |
| 286 | return ret; |
| 287 | } |
| 288 | |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 289 | static void untimeout(struct nf_conntrack_tuple_hash *i, |
| 290 | struct ctnl_timeout *timeout) |
| 291 | { |
| 292 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); |
| 293 | struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct); |
| 294 | |
| 295 | if (timeout_ext && (!timeout || timeout_ext->timeout == timeout)) |
| 296 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); |
| 297 | } |
| 298 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 299 | static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 300 | { |
| 301 | struct nf_conntrack_tuple_hash *h; |
| 302 | const struct hlist_nulls_node *nn; |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 303 | unsigned int last_hsize; |
| 304 | spinlock_t *lock; |
Liping Zhang | 533e330 | 2016-08-22 21:58:18 +0800 | [diff] [blame] | 305 | int i, cpu; |
| 306 | |
| 307 | for_each_possible_cpu(cpu) { |
| 308 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); |
| 309 | |
| 310 | spin_lock_bh(&pcpu->lock); |
| 311 | hlist_nulls_for_each_entry(h, nn, &pcpu->unconfirmed, hnnode) |
| 312 | untimeout(h, timeout); |
| 313 | spin_unlock_bh(&pcpu->lock); |
| 314 | } |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 315 | |
| 316 | local_bh_disable(); |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 317 | restart: |
| 318 | last_hsize = nf_conntrack_htable_size; |
| 319 | for (i = 0; i < last_hsize; i++) { |
| 320 | lock = &nf_conntrack_locks[i % CONNTRACK_LOCKS]; |
| 321 | nf_conntrack_lock(lock); |
| 322 | if (last_hsize != nf_conntrack_htable_size) { |
| 323 | spin_unlock(lock); |
| 324 | goto restart; |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 325 | } |
Liping Zhang | 474803d | 2016-07-03 13:18:44 +0800 | [diff] [blame] | 326 | |
| 327 | hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) |
| 328 | untimeout(h, timeout); |
| 329 | spin_unlock(lock); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 330 | } |
| 331 | local_bh_enable(); |
| 332 | } |
| 333 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 334 | /* try to delete object, fail if it is still in use. */ |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 335 | 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] | 336 | { |
| 337 | int ret = 0; |
| 338 | |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 339 | /* We want to avoid races with ctnl_timeout_put. So only when the |
| 340 | * current refcnt is 1, we decrease it to 0. |
| 341 | */ |
| 342 | if (atomic_cmpxchg(&timeout->refcnt, 1, 0) == 1) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 343 | /* We are protected by nfnl mutex. */ |
| 344 | list_del_rcu(&timeout->head); |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 345 | nf_ct_l4proto_put(timeout->l4proto); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 346 | ctnl_untimeout(net, timeout); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 347 | kfree_rcu(timeout, rcu_head); |
| 348 | } else { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 349 | ret = -EBUSY; |
| 350 | } |
| 351 | return ret; |
| 352 | } |
| 353 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 354 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
| 355 | struct sk_buff *skb, |
| 356 | const struct nlmsghdr *nlh, |
| 357 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 358 | { |
Liping Zhang | 93fac10 | 2016-08-22 21:58:16 +0800 | [diff] [blame] | 359 | struct ctnl_timeout *cur, *tmp; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 360 | int ret = -ENOENT; |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 361 | char *name; |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 362 | |
| 363 | if (!cda[CTA_TIMEOUT_NAME]) { |
Liping Zhang | 93fac10 | 2016-08-22 21:58:16 +0800 | [diff] [blame] | 364 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, |
| 365 | head) |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 366 | ctnl_timeout_try_del(net, cur); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
| 371 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 372 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 373 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 374 | continue; |
| 375 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 376 | ret = ctnl_timeout_try_del(net, cur); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 377 | if (ret < 0) |
| 378 | return ret; |
| 379 | |
| 380 | break; |
| 381 | } |
| 382 | return ret; |
| 383 | } |
| 384 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 385 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
| 386 | struct sk_buff *skb, |
| 387 | const struct nlmsghdr *nlh, |
| 388 | const struct nlattr * const cda[]) |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 389 | { |
| 390 | __u16 l3num; |
| 391 | __u8 l4num; |
| 392 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 393 | unsigned int *timeouts; |
| 394 | int ret; |
| 395 | |
| 396 | if (!cda[CTA_TIMEOUT_L3PROTO] || |
| 397 | !cda[CTA_TIMEOUT_L4PROTO] || |
| 398 | !cda[CTA_TIMEOUT_DATA]) |
| 399 | return -EINVAL; |
| 400 | |
| 401 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 402 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 403 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
| 404 | |
| 405 | /* This protocol is not supported, skip. */ |
| 406 | if (l4proto->l4proto != l4num) { |
| 407 | ret = -EOPNOTSUPP; |
| 408 | goto err; |
| 409 | } |
| 410 | |
| 411 | timeouts = l4proto->get_timeouts(net); |
| 412 | |
| 413 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, |
| 414 | cda[CTA_TIMEOUT_DATA]); |
| 415 | if (ret < 0) |
| 416 | goto err; |
| 417 | |
| 418 | nf_ct_l4proto_put(l4proto); |
| 419 | return 0; |
| 420 | err: |
| 421 | nf_ct_l4proto_put(l4proto); |
| 422 | return ret; |
| 423 | } |
| 424 | |
| 425 | static int |
| 426 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, |
| 427 | u32 seq, u32 type, int event, |
| 428 | struct nf_conntrack_l4proto *l4proto) |
| 429 | { |
| 430 | struct nlmsghdr *nlh; |
| 431 | struct nfgenmsg *nfmsg; |
| 432 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
| 433 | |
| 434 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
| 435 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
| 436 | if (nlh == NULL) |
| 437 | goto nlmsg_failure; |
| 438 | |
| 439 | nfmsg = nlmsg_data(nlh); |
| 440 | nfmsg->nfgen_family = AF_UNSPEC; |
| 441 | nfmsg->version = NFNETLINK_V0; |
| 442 | nfmsg->res_id = 0; |
| 443 | |
| 444 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || |
| 445 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) |
| 446 | goto nla_put_failure; |
| 447 | |
| 448 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
| 449 | struct nlattr *nest_parms; |
| 450 | unsigned int *timeouts = l4proto->get_timeouts(net); |
| 451 | int ret; |
| 452 | |
| 453 | nest_parms = nla_nest_start(skb, |
| 454 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
| 455 | if (!nest_parms) |
| 456 | goto nla_put_failure; |
| 457 | |
| 458 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); |
| 459 | if (ret < 0) |
| 460 | goto nla_put_failure; |
| 461 | |
| 462 | nla_nest_end(skb, nest_parms); |
| 463 | } |
| 464 | |
| 465 | nlmsg_end(skb, nlh); |
| 466 | return skb->len; |
| 467 | |
| 468 | nlmsg_failure: |
| 469 | nla_put_failure: |
| 470 | nlmsg_cancel(skb, nlh); |
| 471 | return -1; |
| 472 | } |
| 473 | |
Pablo Neira Ayuso | 7b8002a | 2015-12-15 18:41:56 +0100 | [diff] [blame] | 474 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
| 475 | struct sk_buff *skb, |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 476 | const struct nlmsghdr *nlh, |
| 477 | const struct nlattr * const cda[]) |
| 478 | { |
| 479 | __u16 l3num; |
| 480 | __u8 l4num; |
| 481 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 482 | struct sk_buff *skb2; |
| 483 | int ret, err; |
| 484 | |
| 485 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) |
| 486 | return -EINVAL; |
| 487 | |
| 488 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
| 489 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
| 490 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
| 491 | |
| 492 | /* This protocol is not supported, skip. */ |
| 493 | if (l4proto->l4proto != l4num) { |
| 494 | err = -EOPNOTSUPP; |
| 495 | goto err; |
| 496 | } |
| 497 | |
| 498 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 499 | if (skb2 == NULL) { |
| 500 | err = -ENOMEM; |
| 501 | goto err; |
| 502 | } |
| 503 | |
| 504 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, |
| 505 | nlh->nlmsg_seq, |
| 506 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 507 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, |
| 508 | l4proto); |
| 509 | if (ret <= 0) { |
| 510 | kfree_skb(skb2); |
| 511 | err = -ENOMEM; |
| 512 | goto err; |
| 513 | } |
| 514 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
| 515 | if (ret > 0) |
| 516 | ret = 0; |
| 517 | |
| 518 | /* this avoids a loop in nfnetlink. */ |
| 519 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 520 | err: |
| 521 | nf_ct_l4proto_put(l4proto); |
| 522 | return err; |
| 523 | } |
| 524 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 525 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 526 | static struct ctnl_timeout * |
| 527 | ctnl_timeout_find_get(struct net *net, const char *name) |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 528 | { |
| 529 | struct ctnl_timeout *timeout, *matching = NULL; |
| 530 | |
| 531 | rcu_read_lock(); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 532 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 533 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
| 534 | continue; |
| 535 | |
| 536 | if (!try_module_get(THIS_MODULE)) |
| 537 | goto err; |
| 538 | |
| 539 | if (!atomic_inc_not_zero(&timeout->refcnt)) { |
| 540 | module_put(THIS_MODULE); |
| 541 | goto err; |
| 542 | } |
| 543 | matching = timeout; |
| 544 | break; |
| 545 | } |
| 546 | err: |
| 547 | rcu_read_unlock(); |
| 548 | return matching; |
| 549 | } |
| 550 | |
| 551 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) |
| 552 | { |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 553 | if (atomic_dec_and_test(&timeout->refcnt)) |
| 554 | kfree_rcu(timeout, rcu_head); |
| 555 | |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 556 | module_put(THIS_MODULE); |
| 557 | } |
| 558 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
| 559 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 560 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
| 561 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, |
| 562 | .attr_count = CTA_TIMEOUT_MAX, |
| 563 | .policy = cttimeout_nla_policy }, |
| 564 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, |
| 565 | .attr_count = CTA_TIMEOUT_MAX, |
| 566 | .policy = cttimeout_nla_policy }, |
| 567 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, |
| 568 | .attr_count = CTA_TIMEOUT_MAX, |
| 569 | .policy = cttimeout_nla_policy }, |
Pablo Neira Ayuso | 91cb498 | 2013-09-04 20:57:48 +0200 | [diff] [blame] | 570 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
| 571 | .attr_count = CTA_TIMEOUT_MAX, |
| 572 | .policy = cttimeout_nla_policy }, |
| 573 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, |
| 574 | .attr_count = CTA_TIMEOUT_MAX, |
| 575 | .policy = cttimeout_nla_policy }, |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 576 | }; |
| 577 | |
| 578 | static const struct nfnetlink_subsystem cttimeout_subsys = { |
| 579 | .name = "conntrack_timeout", |
| 580 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, |
| 581 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, |
| 582 | .cb = cttimeout_cb, |
| 583 | }; |
| 584 | |
| 585 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); |
| 586 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 587 | static int __net_init cttimeout_net_init(struct net *net) |
| 588 | { |
| 589 | INIT_LIST_HEAD(&net->nfct_timeout_list); |
| 590 | |
| 591 | return 0; |
| 592 | } |
| 593 | |
| 594 | static void __net_exit cttimeout_net_exit(struct net *net) |
| 595 | { |
| 596 | struct ctnl_timeout *cur, *tmp; |
| 597 | |
| 598 | ctnl_untimeout(net, NULL); |
| 599 | |
| 600 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { |
| 601 | list_del_rcu(&cur->head); |
| 602 | nf_ct_l4proto_put(cur->l4proto); |
Liping Zhang | b75911b | 2016-08-18 20:39:05 +0800 | [diff] [blame] | 603 | |
| 604 | if (atomic_dec_and_test(&cur->refcnt)) |
| 605 | kfree_rcu(cur, rcu_head); |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 606 | } |
| 607 | } |
| 608 | |
| 609 | static struct pernet_operations cttimeout_ops = { |
| 610 | .init = cttimeout_net_init, |
| 611 | .exit = cttimeout_net_exit, |
| 612 | }; |
| 613 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 614 | static int __init cttimeout_init(void) |
| 615 | { |
| 616 | int ret; |
| 617 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 618 | ret = register_pernet_subsys(&cttimeout_ops); |
| 619 | if (ret < 0) |
| 620 | return ret; |
| 621 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 622 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
| 623 | if (ret < 0) { |
| 624 | pr_err("cttimeout_init: cannot register cttimeout with " |
| 625 | "nfnetlink.\n"); |
| 626 | goto err_out; |
| 627 | } |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 628 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 629 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); |
| 630 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); |
| 631 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 632 | return 0; |
| 633 | |
| 634 | err_out: |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 635 | unregister_pernet_subsys(&cttimeout_ops); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | static void __exit cttimeout_exit(void) |
| 640 | { |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 641 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
| 642 | |
| 643 | nfnetlink_subsys_unregister(&cttimeout_subsys); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 644 | |
Pablo Neira | 19576c9 | 2015-12-09 14:07:40 +0100 | [diff] [blame] | 645 | unregister_pernet_subsys(&cttimeout_ops); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 646 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| 647 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); |
| 648 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); |
Liping Zhang | 146561a | 2017-03-25 08:53:12 +0800 | [diff] [blame^] | 649 | synchronize_rcu(); |
Pablo Neira Ayuso | 24de58f | 2012-02-29 02:19:19 +0100 | [diff] [blame] | 650 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | module_init(cttimeout_init); |
| 654 | module_exit(cttimeout_exit); |