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Commit | Line | Data |
---|---|---|
370786f9 JE |
1 | /* |
2 | * netfilter module to limit the number of parallel tcp | |
3 | * connections per IP address. | |
4 | * (c) 2000 Gerd Knorr <kraxel@bytesex.org> | |
5 | * Nov 2002: Martin Bene <martin.bene@icomedias.com>: | |
6 | * only ignore TIME_WAIT or gone connections | |
ba5dc275 | 7 | * (C) CC Computer Consultants GmbH, 2007 |
370786f9 JE |
8 | * |
9 | * based on ... | |
10 | * | |
11 | * Kernel module to match connection tracking information. | |
12 | * GPL (C) 1999 Rusty Russell (rusty@rustcorp.com.au). | |
13 | */ | |
8bee4bad | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
370786f9 JE |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/jhash.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
370786f9 | 21 | #include <linux/list.h> |
7d084877 | 22 | #include <linux/rbtree.h> |
370786f9 JE |
23 | #include <linux/module.h> |
24 | #include <linux/random.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/netfilter/nf_conntrack_tcp.h> | |
28 | #include <linux/netfilter/x_tables.h> | |
29 | #include <linux/netfilter/xt_connlimit.h> | |
30 | #include <net/netfilter/nf_conntrack.h> | |
31 | #include <net/netfilter/nf_conntrack_core.h> | |
32 | #include <net/netfilter/nf_conntrack_tuple.h> | |
5d0aa2cc | 33 | #include <net/netfilter/nf_conntrack_zones.h> |
370786f9 | 34 | |
e00b437b FW |
35 | #define CONNLIMIT_SLOTS 256U |
36 | ||
37 | #ifdef CONFIG_LOCKDEP | |
38 | #define CONNLIMIT_LOCK_SLOTS 8U | |
39 | #else | |
40 | #define CONNLIMIT_LOCK_SLOTS 256U | |
41 | #endif | |
42 | ||
7d084877 | 43 | #define CONNLIMIT_GC_MAX_NODES 8 |
1442e750 | 44 | |
370786f9 JE |
45 | /* we will save the tuples of all connections we care about */ |
46 | struct xt_connlimit_conn { | |
3e0d5149 | 47 | struct hlist_node node; |
8183e3a8 CG |
48 | struct nf_conntrack_tuple tuple; |
49 | union nf_inet_addr addr; | |
370786f9 JE |
50 | }; |
51 | ||
7d084877 FW |
52 | struct xt_connlimit_rb { |
53 | struct rb_node node; | |
54 | struct hlist_head hhead; /* connections/hosts in same subnet */ | |
55 | union nf_inet_addr addr; /* search key */ | |
56 | }; | |
57 | ||
e00b437b FW |
58 | static spinlock_t xt_connlimit_locks[CONNLIMIT_LOCK_SLOTS] __cacheline_aligned_in_smp; |
59 | ||
370786f9 | 60 | struct xt_connlimit_data { |
7d084877 FW |
61 | struct rb_root climit_root4[CONNLIMIT_SLOTS]; |
62 | struct rb_root climit_root6[CONNLIMIT_SLOTS]; | |
370786f9 JE |
63 | }; |
64 | ||
294188ae | 65 | static u_int32_t connlimit_rnd __read_mostly; |
7d084877 | 66 | static struct kmem_cache *connlimit_rb_cachep __read_mostly; |
14e1a977 | 67 | static struct kmem_cache *connlimit_conn_cachep __read_mostly; |
370786f9 | 68 | |
a34c4589 | 69 | static inline unsigned int connlimit_iphash(__be32 addr) |
370786f9 | 70 | { |
1442e750 FW |
71 | return jhash_1word((__force __u32)addr, |
72 | connlimit_rnd) % CONNLIMIT_SLOTS; | |
370786f9 JE |
73 | } |
74 | ||
75 | static inline unsigned int | |
643a2c15 JE |
76 | connlimit_iphash6(const union nf_inet_addr *addr, |
77 | const union nf_inet_addr *mask) | |
370786f9 | 78 | { |
643a2c15 | 79 | union nf_inet_addr res; |
370786f9 JE |
80 | unsigned int i; |
81 | ||
370786f9 JE |
82 | for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i) |
83 | res.ip6[i] = addr->ip6[i] & mask->ip6[i]; | |
84 | ||
1442e750 FW |
85 | return jhash2((u32 *)res.ip6, ARRAY_SIZE(res.ip6), |
86 | connlimit_rnd) % CONNLIMIT_SLOTS; | |
370786f9 JE |
87 | } |
88 | ||
89 | static inline bool already_closed(const struct nf_conn *conn) | |
90 | { | |
5e8fbe2a | 91 | if (nf_ct_protonum(conn) == IPPROTO_TCP) |
d2ee3f2c DW |
92 | return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT || |
93 | conn->proto.tcp.state == TCP_CONNTRACK_CLOSE; | |
370786f9 JE |
94 | else |
95 | return 0; | |
96 | } | |
97 | ||
50e0e9b1 | 98 | static int |
643a2c15 JE |
99 | same_source_net(const union nf_inet_addr *addr, |
100 | const union nf_inet_addr *mask, | |
76108cea | 101 | const union nf_inet_addr *u3, u_int8_t family) |
370786f9 | 102 | { |
ee999d8b | 103 | if (family == NFPROTO_IPV4) { |
50e0e9b1 FW |
104 | return ntohl(addr->ip & mask->ip) - |
105 | ntohl(u3->ip & mask->ip); | |
370786f9 | 106 | } else { |
643a2c15 | 107 | union nf_inet_addr lh, rh; |
370786f9 JE |
108 | unsigned int i; |
109 | ||
110 | for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i) { | |
111 | lh.ip6[i] = addr->ip6[i] & mask->ip6[i]; | |
112 | rh.ip6[i] = u3->ip6[i] & mask->ip6[i]; | |
113 | } | |
114 | ||
50e0e9b1 | 115 | return memcmp(&lh.ip6, &rh.ip6, sizeof(lh.ip6)); |
370786f9 JE |
116 | } |
117 | } | |
118 | ||
7d084877 FW |
119 | static bool add_hlist(struct hlist_head *head, |
120 | const struct nf_conntrack_tuple *tuple, | |
121 | const union nf_inet_addr *addr) | |
122 | { | |
123 | struct xt_connlimit_conn *conn; | |
124 | ||
125 | conn = kmem_cache_alloc(connlimit_conn_cachep, GFP_ATOMIC); | |
126 | if (conn == NULL) | |
127 | return false; | |
128 | conn->tuple = *tuple; | |
129 | conn->addr = *addr; | |
130 | hlist_add_head(&conn->node, head); | |
131 | return true; | |
132 | } | |
133 | ||
134 | static unsigned int check_hlist(struct net *net, | |
135 | struct hlist_head *head, | |
136 | const struct nf_conntrack_tuple *tuple, | |
308ac914 | 137 | const struct nf_conntrack_zone *zone, |
7d084877 | 138 | bool *addit) |
370786f9 | 139 | { |
3cf93c96 | 140 | const struct nf_conntrack_tuple_hash *found; |
370786f9 | 141 | struct xt_connlimit_conn *conn; |
b67bfe0d | 142 | struct hlist_node *n; |
ea781f19 | 143 | struct nf_conn *found_ct; |
7d084877 | 144 | unsigned int length = 0; |
370786f9 | 145 | |
7d084877 | 146 | *addit = true; |
76507f69 | 147 | rcu_read_lock(); |
370786f9 JE |
148 | |
149 | /* check the saved connections */ | |
15cfd528 | 150 | hlist_for_each_entry_safe(conn, n, head, node) { |
e59ea3df | 151 | found = nf_conntrack_find_get(net, zone, &conn->tuple); |
d9ec4f1e FW |
152 | if (found == NULL) { |
153 | hlist_del(&conn->node); | |
14e1a977 | 154 | kmem_cache_free(connlimit_conn_cachep, conn); |
d9ec4f1e FW |
155 | continue; |
156 | } | |
370786f9 | 157 | |
d9ec4f1e | 158 | found_ct = nf_ct_tuplehash_to_ctrack(found); |
370786f9 | 159 | |
d9ec4f1e | 160 | if (nf_ct_tuple_equal(&conn->tuple, tuple)) { |
370786f9 JE |
161 | /* |
162 | * Just to be sure we have it only once in the list. | |
163 | * We should not see tuples twice unless someone hooks | |
164 | * this into a table without "-p tcp --syn". | |
165 | */ | |
3bcc5fdf | 166 | *addit = false; |
d9ec4f1e | 167 | } else if (already_closed(found_ct)) { |
370786f9 JE |
168 | /* |
169 | * we do not care about connections which are | |
170 | * closed already -> ditch it | |
171 | */ | |
ea781f19 | 172 | nf_ct_put(found_ct); |
3e0d5149 | 173 | hlist_del(&conn->node); |
14e1a977 | 174 | kmem_cache_free(connlimit_conn_cachep, conn); |
370786f9 JE |
175 | continue; |
176 | } | |
177 | ||
ea781f19 | 178 | nf_ct_put(found_ct); |
7d084877 | 179 | length++; |
370786f9 JE |
180 | } |
181 | ||
76507f69 | 182 | rcu_read_unlock(); |
370786f9 | 183 | |
7d084877 | 184 | return length; |
370786f9 JE |
185 | } |
186 | ||
7d084877 FW |
187 | static void tree_nodes_free(struct rb_root *root, |
188 | struct xt_connlimit_rb *gc_nodes[], | |
189 | unsigned int gc_count) | |
190 | { | |
191 | struct xt_connlimit_rb *rbconn; | |
192 | ||
193 | while (gc_count) { | |
194 | rbconn = gc_nodes[--gc_count]; | |
195 | rb_erase(&rbconn->node, root); | |
196 | kmem_cache_free(connlimit_rb_cachep, rbconn); | |
197 | } | |
198 | } | |
199 | ||
200 | static unsigned int | |
201 | count_tree(struct net *net, struct rb_root *root, | |
202 | const struct nf_conntrack_tuple *tuple, | |
203 | const union nf_inet_addr *addr, const union nf_inet_addr *mask, | |
308ac914 | 204 | u8 family, const struct nf_conntrack_zone *zone) |
3bcc5fdf | 205 | { |
7d084877 FW |
206 | struct xt_connlimit_rb *gc_nodes[CONNLIMIT_GC_MAX_NODES]; |
207 | struct rb_node **rbnode, *parent; | |
208 | struct xt_connlimit_rb *rbconn; | |
14e1a977 | 209 | struct xt_connlimit_conn *conn; |
7d084877 FW |
210 | unsigned int gc_count; |
211 | bool no_gc = false; | |
212 | ||
213 | restart: | |
214 | gc_count = 0; | |
215 | parent = NULL; | |
216 | rbnode = &(root->rb_node); | |
217 | while (*rbnode) { | |
218 | int diff; | |
219 | bool addit; | |
220 | ||
221 | rbconn = container_of(*rbnode, struct xt_connlimit_rb, node); | |
222 | ||
223 | parent = *rbnode; | |
224 | diff = same_source_net(addr, mask, &rbconn->addr, family); | |
225 | if (diff < 0) { | |
226 | rbnode = &((*rbnode)->rb_left); | |
227 | } else if (diff > 0) { | |
228 | rbnode = &((*rbnode)->rb_right); | |
229 | } else { | |
230 | /* same source network -> be counted! */ | |
231 | unsigned int count; | |
e59ea3df | 232 | count = check_hlist(net, &rbconn->hhead, tuple, zone, &addit); |
7d084877 FW |
233 | |
234 | tree_nodes_free(root, gc_nodes, gc_count); | |
235 | if (!addit) | |
236 | return count; | |
237 | ||
238 | if (!add_hlist(&rbconn->hhead, tuple, addr)) | |
239 | return 0; /* hotdrop */ | |
240 | ||
241 | return count + 1; | |
242 | } | |
243 | ||
244 | if (no_gc || gc_count >= ARRAY_SIZE(gc_nodes)) | |
245 | continue; | |
246 | ||
247 | /* only used for GC on hhead, retval and 'addit' ignored */ | |
e59ea3df | 248 | check_hlist(net, &rbconn->hhead, tuple, zone, &addit); |
7d084877 FW |
249 | if (hlist_empty(&rbconn->hhead)) |
250 | gc_nodes[gc_count++] = rbconn; | |
251 | } | |
252 | ||
253 | if (gc_count) { | |
254 | no_gc = true; | |
255 | tree_nodes_free(root, gc_nodes, gc_count); | |
256 | /* tree_node_free before new allocation permits | |
257 | * allocator to re-use newly free'd object. | |
258 | * | |
259 | * This is a rare event; in most cases we will find | |
260 | * existing node to re-use. (or gc_count is 0). | |
261 | */ | |
262 | goto restart; | |
263 | } | |
264 | ||
265 | /* no match, need to insert new node */ | |
266 | rbconn = kmem_cache_alloc(connlimit_rb_cachep, GFP_ATOMIC); | |
267 | if (rbconn == NULL) | |
268 | return 0; | |
14e1a977 FW |
269 | |
270 | conn = kmem_cache_alloc(connlimit_conn_cachep, GFP_ATOMIC); | |
7d084877 FW |
271 | if (conn == NULL) { |
272 | kmem_cache_free(connlimit_rb_cachep, rbconn); | |
273 | return 0; | |
274 | } | |
275 | ||
3bcc5fdf FW |
276 | conn->tuple = *tuple; |
277 | conn->addr = *addr; | |
7d084877 FW |
278 | rbconn->addr = *addr; |
279 | ||
280 | INIT_HLIST_HEAD(&rbconn->hhead); | |
281 | hlist_add_head(&conn->node, &rbconn->hhead); | |
282 | ||
283 | rb_link_node(&rbconn->node, parent, rbnode); | |
284 | rb_insert_color(&rbconn->node, root); | |
285 | return 1; | |
3bcc5fdf FW |
286 | } |
287 | ||
15cfd528 FW |
288 | static int count_them(struct net *net, |
289 | struct xt_connlimit_data *data, | |
290 | const struct nf_conntrack_tuple *tuple, | |
291 | const union nf_inet_addr *addr, | |
292 | const union nf_inet_addr *mask, | |
308ac914 DB |
293 | u_int8_t family, |
294 | const struct nf_conntrack_zone *zone) | |
15cfd528 | 295 | { |
7d084877 | 296 | struct rb_root *root; |
15cfd528 FW |
297 | int count; |
298 | u32 hash; | |
299 | ||
7d084877 | 300 | if (family == NFPROTO_IPV6) { |
15cfd528 | 301 | hash = connlimit_iphash6(addr, mask); |
7d084877 FW |
302 | root = &data->climit_root6[hash]; |
303 | } else { | |
15cfd528 | 304 | hash = connlimit_iphash(addr->ip & mask->ip); |
7d084877 FW |
305 | root = &data->climit_root4[hash]; |
306 | } | |
15cfd528 | 307 | |
e00b437b | 308 | spin_lock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]); |
7d084877 | 309 | |
e59ea3df | 310 | count = count_tree(net, root, tuple, addr, mask, family, zone); |
7d084877 | 311 | |
e00b437b | 312 | spin_unlock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]); |
15cfd528 FW |
313 | |
314 | return count; | |
315 | } | |
316 | ||
d3c5ee6d | 317 | static bool |
62fc8051 | 318 | connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par) |
370786f9 | 319 | { |
613dbd95 | 320 | struct net *net = xt_net(par); |
f7108a20 | 321 | const struct xt_connlimit_info *info = par->matchinfo; |
22c2d8bc | 322 | union nf_inet_addr addr; |
370786f9 JE |
323 | struct nf_conntrack_tuple tuple; |
324 | const struct nf_conntrack_tuple *tuple_ptr = &tuple; | |
308ac914 | 325 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; |
370786f9 JE |
326 | enum ip_conntrack_info ctinfo; |
327 | const struct nf_conn *ct; | |
7d084877 | 328 | unsigned int connections; |
370786f9 JE |
329 | |
330 | ct = nf_ct_get(skb, &ctinfo); | |
e59ea3df | 331 | if (ct != NULL) { |
8183e3a8 | 332 | tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; |
e59ea3df FW |
333 | zone = nf_ct_zone(ct); |
334 | } else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
613dbd95 | 335 | xt_family(par), net, &tuple)) { |
370786f9 | 336 | goto hotdrop; |
e59ea3df | 337 | } |
370786f9 | 338 | |
613dbd95 | 339 | if (xt_family(par) == NFPROTO_IPV6) { |
370786f9 | 340 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
cc4fc022 JE |
341 | memcpy(&addr.ip6, (info->flags & XT_CONNLIMIT_DADDR) ? |
342 | &iph->daddr : &iph->saddr, sizeof(addr.ip6)); | |
370786f9 JE |
343 | } else { |
344 | const struct iphdr *iph = ip_hdr(skb); | |
cc4fc022 JE |
345 | addr.ip = (info->flags & XT_CONNLIMIT_DADDR) ? |
346 | iph->daddr : iph->saddr; | |
370786f9 JE |
347 | } |
348 | ||
83fc8102 | 349 | connections = count_them(net, info->data, tuple_ptr, &addr, |
613dbd95 | 350 | &info->mask, xt_family(par), zone); |
7d084877 | 351 | if (connections == 0) |
370786f9 | 352 | /* kmalloc failed, drop it entirely */ |
1cc34c30 | 353 | goto hotdrop; |
370786f9 | 354 | |
cc4fc022 JE |
355 | return (connections > info->limit) ^ |
356 | !!(info->flags & XT_CONNLIMIT_INVERT); | |
370786f9 JE |
357 | |
358 | hotdrop: | |
b4ba2611 | 359 | par->hotdrop = true; |
370786f9 JE |
360 | return false; |
361 | } | |
362 | ||
b0f38452 | 363 | static int connlimit_mt_check(const struct xt_mtchk_param *par) |
370786f9 | 364 | { |
9b4fce7a | 365 | struct xt_connlimit_info *info = par->matchinfo; |
370786f9 | 366 | unsigned int i; |
4a5a5c73 | 367 | int ret; |
370786f9 | 368 | |
7bdc6624 | 369 | net_get_random_once(&connlimit_rnd, sizeof(connlimit_rnd)); |
4656c4d6 | 370 | |
ecb2421b | 371 | ret = nf_ct_netns_get(par->net, par->family); |
4a5a5c73 | 372 | if (ret < 0) { |
8bee4bad JE |
373 | pr_info("cannot load conntrack support for " |
374 | "address family %u\n", par->family); | |
4a5a5c73 | 375 | return ret; |
370786f9 JE |
376 | } |
377 | ||
378 | /* init private data */ | |
379 | info->data = kmalloc(sizeof(struct xt_connlimit_data), GFP_KERNEL); | |
380 | if (info->data == NULL) { | |
ecb2421b | 381 | nf_ct_netns_put(par->net, par->family); |
4a5a5c73 | 382 | return -ENOMEM; |
370786f9 JE |
383 | } |
384 | ||
7d084877 FW |
385 | for (i = 0; i < ARRAY_SIZE(info->data->climit_root4); ++i) |
386 | info->data->climit_root4[i] = RB_ROOT; | |
387 | for (i = 0; i < ARRAY_SIZE(info->data->climit_root6); ++i) | |
388 | info->data->climit_root6[i] = RB_ROOT; | |
370786f9 | 389 | |
bd414ee6 | 390 | return 0; |
370786f9 JE |
391 | } |
392 | ||
7d084877 | 393 | static void destroy_tree(struct rb_root *r) |
370786f9 | 394 | { |
370786f9 | 395 | struct xt_connlimit_conn *conn; |
7d084877 | 396 | struct xt_connlimit_rb *rbconn; |
b67bfe0d | 397 | struct hlist_node *n; |
7d084877 | 398 | struct rb_node *node; |
370786f9 | 399 | |
7d084877 FW |
400 | while ((node = rb_first(r)) != NULL) { |
401 | rbconn = container_of(node, struct xt_connlimit_rb, node); | |
370786f9 | 402 | |
7d084877 FW |
403 | rb_erase(node, r); |
404 | ||
405 | hlist_for_each_entry_safe(conn, n, &rbconn->hhead, node) | |
14e1a977 | 406 | kmem_cache_free(connlimit_conn_cachep, conn); |
7d084877 FW |
407 | |
408 | kmem_cache_free(connlimit_rb_cachep, rbconn); | |
370786f9 | 409 | } |
7d084877 FW |
410 | } |
411 | ||
412 | static void connlimit_mt_destroy(const struct xt_mtdtor_param *par) | |
413 | { | |
414 | const struct xt_connlimit_info *info = par->matchinfo; | |
415 | unsigned int i; | |
416 | ||
ecb2421b | 417 | nf_ct_netns_put(par->net, par->family); |
7d084877 FW |
418 | |
419 | for (i = 0; i < ARRAY_SIZE(info->data->climit_root4); ++i) | |
420 | destroy_tree(&info->data->climit_root4[i]); | |
421 | for (i = 0; i < ARRAY_SIZE(info->data->climit_root6); ++i) | |
422 | destroy_tree(&info->data->climit_root6[i]); | |
370786f9 JE |
423 | |
424 | kfree(info->data); | |
425 | } | |
426 | ||
68c07cb6 CW |
427 | static struct xt_match connlimit_mt_reg __read_mostly = { |
428 | .name = "connlimit", | |
429 | .revision = 1, | |
430 | .family = NFPROTO_UNSPEC, | |
431 | .checkentry = connlimit_mt_check, | |
432 | .match = connlimit_mt, | |
433 | .matchsize = sizeof(struct xt_connlimit_info), | |
434 | .destroy = connlimit_mt_destroy, | |
435 | .me = THIS_MODULE, | |
370786f9 JE |
436 | }; |
437 | ||
d3c5ee6d | 438 | static int __init connlimit_mt_init(void) |
370786f9 | 439 | { |
e00b437b | 440 | int ret, i; |
1442e750 FW |
441 | |
442 | BUILD_BUG_ON(CONNLIMIT_LOCK_SLOTS > CONNLIMIT_SLOTS); | |
443 | BUILD_BUG_ON((CONNLIMIT_SLOTS % CONNLIMIT_LOCK_SLOTS) != 0); | |
444 | ||
e00b437b FW |
445 | for (i = 0; i < CONNLIMIT_LOCK_SLOTS; ++i) |
446 | spin_lock_init(&xt_connlimit_locks[i]); | |
447 | ||
14e1a977 FW |
448 | connlimit_conn_cachep = kmem_cache_create("xt_connlimit_conn", |
449 | sizeof(struct xt_connlimit_conn), | |
450 | 0, 0, NULL); | |
451 | if (!connlimit_conn_cachep) | |
452 | return -ENOMEM; | |
453 | ||
7d084877 FW |
454 | connlimit_rb_cachep = kmem_cache_create("xt_connlimit_rb", |
455 | sizeof(struct xt_connlimit_rb), | |
456 | 0, 0, NULL); | |
457 | if (!connlimit_rb_cachep) { | |
458 | kmem_cache_destroy(connlimit_conn_cachep); | |
459 | return -ENOMEM; | |
460 | } | |
14e1a977 | 461 | ret = xt_register_match(&connlimit_mt_reg); |
7d084877 | 462 | if (ret != 0) { |
14e1a977 | 463 | kmem_cache_destroy(connlimit_conn_cachep); |
7d084877 FW |
464 | kmem_cache_destroy(connlimit_rb_cachep); |
465 | } | |
14e1a977 | 466 | return ret; |
370786f9 JE |
467 | } |
468 | ||
d3c5ee6d | 469 | static void __exit connlimit_mt_exit(void) |
370786f9 | 470 | { |
68c07cb6 | 471 | xt_unregister_match(&connlimit_mt_reg); |
14e1a977 | 472 | kmem_cache_destroy(connlimit_conn_cachep); |
7d084877 | 473 | kmem_cache_destroy(connlimit_rb_cachep); |
370786f9 JE |
474 | } |
475 | ||
d3c5ee6d JE |
476 | module_init(connlimit_mt_init); |
477 | module_exit(connlimit_mt_exit); | |
92f3b2b1 | 478 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
2ae15b64 | 479 | MODULE_DESCRIPTION("Xtables: Number of connections matching"); |
370786f9 JE |
480 | MODULE_LICENSE("GPL"); |
481 | MODULE_ALIAS("ipt_connlimit"); | |
482 | MODULE_ALIAS("ip6t_connlimit"); |