Commit | Line | Data |
---|---|---|
09e410de JE |
1 | /* |
2 | * xt_hashlimit - Netfilter module to limit the number of packets per time | |
3ad2f3fb | 3 | * separately for each hashbucket (sourceip/sourceport/dstip/dstport) |
1da177e4 | 4 | * |
09e410de JE |
5 | * (C) 2003-2004 by Harald Welte <laforge@netfilter.org> |
6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
1da177e4 LT |
7 | * |
8 | * Development of this code was funded by Astaro AG, http://www.astaro.com/ | |
1da177e4 LT |
9 | */ |
10 | #include <linux/module.h> | |
1da177e4 LT |
11 | #include <linux/spinlock.h> |
12 | #include <linux/random.h> | |
13 | #include <linux/jhash.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/vmalloc.h> | |
1da177e4 LT |
16 | #include <linux/proc_fs.h> |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/list.h> | |
39b46fc6 | 19 | #include <linux/skbuff.h> |
d7fe0f24 | 20 | #include <linux/mm.h> |
39b46fc6 PM |
21 | #include <linux/in.h> |
22 | #include <linux/ip.h> | |
7b21e09d | 23 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 | 24 | #include <linux/ipv6.h> |
193b23c5 | 25 | #include <net/ipv6.h> |
7b21e09d ED |
26 | #endif |
27 | ||
457c4cbc | 28 | #include <net/net_namespace.h> |
e89fc3f1 | 29 | #include <net/netns/generic.h> |
1da177e4 | 30 | |
39b46fc6 | 31 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 32 | #include <linux/netfilter_ipv4/ip_tables.h> |
39b46fc6 PM |
33 | #include <linux/netfilter_ipv6/ip6_tables.h> |
34 | #include <linux/netfilter/xt_hashlimit.h> | |
14cc3e2b | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | |
37 | MODULE_LICENSE("GPL"); | |
38 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
09e410de | 39 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
2ae15b64 | 40 | MODULE_DESCRIPTION("Xtables: per hash-bucket rate-limit match"); |
39b46fc6 PM |
41 | MODULE_ALIAS("ipt_hashlimit"); |
42 | MODULE_ALIAS("ip6t_hashlimit"); | |
1da177e4 | 43 | |
e89fc3f1 AD |
44 | struct hashlimit_net { |
45 | struct hlist_head htables; | |
46 | struct proc_dir_entry *ipt_hashlimit; | |
47 | struct proc_dir_entry *ip6t_hashlimit; | |
48 | }; | |
49 | ||
50 | static int hashlimit_net_id; | |
51 | static inline struct hashlimit_net *hashlimit_pernet(struct net *net) | |
52 | { | |
53 | return net_generic(net, hashlimit_net_id); | |
54 | } | |
55 | ||
1da177e4 | 56 | /* need to declare this at the top */ |
da7071d7 | 57 | static const struct file_operations dl_file_ops; |
1da177e4 LT |
58 | |
59 | /* hash table crap */ | |
1da177e4 | 60 | struct dsthash_dst { |
39b46fc6 PM |
61 | union { |
62 | struct { | |
63 | __be32 src; | |
64 | __be32 dst; | |
65 | } ip; | |
7b21e09d | 66 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 PM |
67 | struct { |
68 | __be32 src[4]; | |
69 | __be32 dst[4]; | |
70 | } ip6; | |
7b21e09d | 71 | #endif |
09e410de | 72 | }; |
6a19d614 AV |
73 | __be16 src_port; |
74 | __be16 dst_port; | |
1da177e4 LT |
75 | }; |
76 | ||
77 | struct dsthash_ent { | |
78 | /* static / read-only parts in the beginning */ | |
79 | struct hlist_node node; | |
80 | struct dsthash_dst dst; | |
81 | ||
82 | /* modified structure members in the end */ | |
83 | unsigned long expires; /* precalculated expiry time */ | |
84 | struct { | |
85 | unsigned long prev; /* last modification */ | |
86 | u_int32_t credit; | |
87 | u_int32_t credit_cap, cost; | |
88 | } rateinfo; | |
89 | }; | |
90 | ||
39b46fc6 | 91 | struct xt_hashlimit_htable { |
1da177e4 | 92 | struct hlist_node node; /* global list of all htables */ |
2eff25c1 | 93 | int use; |
76108cea | 94 | u_int8_t family; |
89bc7a0f | 95 | bool rnd_initialized; |
1da177e4 | 96 | |
09e410de | 97 | struct hashlimit_cfg1 cfg; /* config */ |
1da177e4 LT |
98 | |
99 | /* used internally */ | |
100 | spinlock_t lock; /* lock for list_head */ | |
101 | u_int32_t rnd; /* random seed for hash */ | |
39b46fc6 | 102 | unsigned int count; /* number entries in table */ |
1da177e4 | 103 | struct timer_list timer; /* timer for gc */ |
1da177e4 LT |
104 | |
105 | /* seq_file stuff */ | |
106 | struct proc_dir_entry *pde; | |
e89fc3f1 | 107 | struct net *net; |
1da177e4 LT |
108 | |
109 | struct hlist_head hash[0]; /* hashtable itself */ | |
110 | }; | |
111 | ||
2eff25c1 | 112 | static DEFINE_MUTEX(hashlimit_mutex); /* protects htables list */ |
e18b890b | 113 | static struct kmem_cache *hashlimit_cachep __read_mostly; |
1da177e4 | 114 | |
1d93a9cb | 115 | static inline bool dst_cmp(const struct dsthash_ent *ent, |
a47362a2 | 116 | const struct dsthash_dst *b) |
1da177e4 | 117 | { |
39b46fc6 | 118 | return !memcmp(&ent->dst, b, sizeof(ent->dst)); |
1da177e4 LT |
119 | } |
120 | ||
39b46fc6 PM |
121 | static u_int32_t |
122 | hash_dst(const struct xt_hashlimit_htable *ht, const struct dsthash_dst *dst) | |
1da177e4 | 123 | { |
e2f82ac3 ED |
124 | u_int32_t hash = jhash2((const u32 *)dst, |
125 | sizeof(*dst)/sizeof(u32), | |
126 | ht->rnd); | |
127 | /* | |
128 | * Instead of returning hash % ht->cfg.size (implying a divide) | |
129 | * we return the high 32 bits of the (hash * ht->cfg.size) that will | |
130 | * give results between [0 and cfg.size-1] and same hash distribution, | |
131 | * but using a multiply, less expensive than a divide | |
132 | */ | |
133 | return ((u64)hash * ht->cfg.size) >> 32; | |
1da177e4 LT |
134 | } |
135 | ||
39b46fc6 | 136 | static struct dsthash_ent * |
a47362a2 JE |
137 | dsthash_find(const struct xt_hashlimit_htable *ht, |
138 | const struct dsthash_dst *dst) | |
1da177e4 LT |
139 | { |
140 | struct dsthash_ent *ent; | |
141 | struct hlist_node *pos; | |
142 | u_int32_t hash = hash_dst(ht, dst); | |
143 | ||
39b46fc6 PM |
144 | if (!hlist_empty(&ht->hash[hash])) { |
145 | hlist_for_each_entry(ent, pos, &ht->hash[hash], node) | |
146 | if (dst_cmp(ent, dst)) | |
1da177e4 | 147 | return ent; |
39b46fc6 | 148 | } |
1da177e4 LT |
149 | return NULL; |
150 | } | |
151 | ||
152 | /* allocate dsthash_ent, initialize dst, put in htable and lock it */ | |
153 | static struct dsthash_ent * | |
a47362a2 JE |
154 | dsthash_alloc_init(struct xt_hashlimit_htable *ht, |
155 | const struct dsthash_dst *dst) | |
1da177e4 LT |
156 | { |
157 | struct dsthash_ent *ent; | |
158 | ||
159 | /* initialize hash with random val at the time we allocate | |
160 | * the first hashtable entry */ | |
bf0857ea | 161 | if (!ht->rnd_initialized) { |
af07d241 | 162 | get_random_bytes(&ht->rnd, sizeof(ht->rnd)); |
89bc7a0f | 163 | ht->rnd_initialized = true; |
bf0857ea | 164 | } |
1da177e4 | 165 | |
39b46fc6 | 166 | if (ht->cfg.max && ht->count >= ht->cfg.max) { |
1da177e4 LT |
167 | /* FIXME: do something. question is what.. */ |
168 | if (net_ratelimit()) | |
39b46fc6 PM |
169 | printk(KERN_WARNING |
170 | "xt_hashlimit: max count of %u reached\n", | |
1da177e4 LT |
171 | ht->cfg.max); |
172 | return NULL; | |
173 | } | |
174 | ||
175 | ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC); | |
176 | if (!ent) { | |
177 | if (net_ratelimit()) | |
39b46fc6 PM |
178 | printk(KERN_ERR |
179 | "xt_hashlimit: can't allocate dsthash_ent\n"); | |
1da177e4 LT |
180 | return NULL; |
181 | } | |
39b46fc6 | 182 | memcpy(&ent->dst, dst, sizeof(ent->dst)); |
1da177e4 LT |
183 | |
184 | hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]); | |
39b46fc6 | 185 | ht->count++; |
1da177e4 LT |
186 | return ent; |
187 | } | |
188 | ||
39b46fc6 PM |
189 | static inline void |
190 | dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent) | |
1da177e4 LT |
191 | { |
192 | hlist_del(&ent->node); | |
193 | kmem_cache_free(hashlimit_cachep, ent); | |
39b46fc6 | 194 | ht->count--; |
1da177e4 LT |
195 | } |
196 | static void htable_gc(unsigned long htlong); | |
197 | ||
e89fc3f1 | 198 | static int htable_create_v0(struct net *net, struct xt_hashlimit_info *minfo, u_int8_t family) |
1da177e4 | 199 | { |
e89fc3f1 | 200 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
39b46fc6 | 201 | struct xt_hashlimit_htable *hinfo; |
1da177e4 | 202 | unsigned int size; |
39b46fc6 | 203 | unsigned int i; |
1da177e4 LT |
204 | |
205 | if (minfo->cfg.size) | |
206 | size = minfo->cfg.size; | |
207 | else { | |
4481374c | 208 | size = ((totalram_pages << PAGE_SHIFT) / 16384) / |
39b46fc6 | 209 | sizeof(struct list_head); |
4481374c | 210 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
1da177e4 LT |
211 | size = 8192; |
212 | if (size < 16) | |
213 | size = 16; | |
214 | } | |
215 | /* FIXME: don't use vmalloc() here or anywhere else -HW */ | |
39b46fc6 PM |
216 | hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) + |
217 | sizeof(struct list_head) * size); | |
1da177e4 | 218 | if (!hinfo) { |
39b46fc6 | 219 | printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n"); |
1da177e4 LT |
220 | return -1; |
221 | } | |
222 | minfo->hinfo = hinfo; | |
223 | ||
224 | /* copy match config into hashtable config */ | |
09e410de JE |
225 | hinfo->cfg.mode = minfo->cfg.mode; |
226 | hinfo->cfg.avg = minfo->cfg.avg; | |
227 | hinfo->cfg.burst = minfo->cfg.burst; | |
228 | hinfo->cfg.max = minfo->cfg.max; | |
229 | hinfo->cfg.gc_interval = minfo->cfg.gc_interval; | |
230 | hinfo->cfg.expire = minfo->cfg.expire; | |
231 | ||
ee999d8b | 232 | if (family == NFPROTO_IPV4) |
09e410de JE |
233 | hinfo->cfg.srcmask = hinfo->cfg.dstmask = 32; |
234 | else | |
235 | hinfo->cfg.srcmask = hinfo->cfg.dstmask = 128; | |
236 | ||
1da177e4 LT |
237 | hinfo->cfg.size = size; |
238 | if (!hinfo->cfg.max) | |
239 | hinfo->cfg.max = 8 * hinfo->cfg.size; | |
240 | else if (hinfo->cfg.max < hinfo->cfg.size) | |
241 | hinfo->cfg.max = hinfo->cfg.size; | |
242 | ||
243 | for (i = 0; i < hinfo->cfg.size; i++) | |
244 | INIT_HLIST_HEAD(&hinfo->hash[i]); | |
245 | ||
2eff25c1 | 246 | hinfo->use = 1; |
39b46fc6 PM |
247 | hinfo->count = 0; |
248 | hinfo->family = family; | |
89bc7a0f | 249 | hinfo->rnd_initialized = false; |
1da177e4 | 250 | spin_lock_init(&hinfo->lock); |
ee999d8b JE |
251 | hinfo->pde = proc_create_data(minfo->name, 0, |
252 | (family == NFPROTO_IPV4) ? | |
e89fc3f1 | 253 | hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit, |
ee999d8b | 254 | &dl_file_ops, hinfo); |
1da177e4 LT |
255 | if (!hinfo->pde) { |
256 | vfree(hinfo); | |
257 | return -1; | |
258 | } | |
e89fc3f1 | 259 | hinfo->net = net; |
1da177e4 | 260 | |
e6f689db | 261 | setup_timer(&hinfo->timer, htable_gc, (unsigned long )hinfo); |
1da177e4 | 262 | hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); |
1da177e4 LT |
263 | add_timer(&hinfo->timer); |
264 | ||
e89fc3f1 | 265 | hlist_add_head(&hinfo->node, &hashlimit_net->htables); |
1da177e4 LT |
266 | |
267 | return 0; | |
268 | } | |
269 | ||
e89fc3f1 AD |
270 | static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo, |
271 | u_int8_t family) | |
09e410de | 272 | { |
e89fc3f1 | 273 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
09e410de JE |
274 | struct xt_hashlimit_htable *hinfo; |
275 | unsigned int size; | |
276 | unsigned int i; | |
277 | ||
278 | if (minfo->cfg.size) { | |
279 | size = minfo->cfg.size; | |
280 | } else { | |
4481374c | 281 | size = (totalram_pages << PAGE_SHIFT) / 16384 / |
09e410de | 282 | sizeof(struct list_head); |
4481374c | 283 | if (totalram_pages > 1024 * 1024 * 1024 / PAGE_SIZE) |
09e410de JE |
284 | size = 8192; |
285 | if (size < 16) | |
286 | size = 16; | |
287 | } | |
288 | /* FIXME: don't use vmalloc() here or anywhere else -HW */ | |
289 | hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) + | |
290 | sizeof(struct list_head) * size); | |
291 | if (hinfo == NULL) { | |
292 | printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n"); | |
293 | return -1; | |
294 | } | |
295 | minfo->hinfo = hinfo; | |
296 | ||
297 | /* copy match config into hashtable config */ | |
298 | memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg)); | |
299 | hinfo->cfg.size = size; | |
300 | if (hinfo->cfg.max == 0) | |
301 | hinfo->cfg.max = 8 * hinfo->cfg.size; | |
302 | else if (hinfo->cfg.max < hinfo->cfg.size) | |
303 | hinfo->cfg.max = hinfo->cfg.size; | |
304 | ||
305 | for (i = 0; i < hinfo->cfg.size; i++) | |
306 | INIT_HLIST_HEAD(&hinfo->hash[i]); | |
307 | ||
2eff25c1 | 308 | hinfo->use = 1; |
09e410de JE |
309 | hinfo->count = 0; |
310 | hinfo->family = family; | |
89bc7a0f | 311 | hinfo->rnd_initialized = false; |
09e410de JE |
312 | spin_lock_init(&hinfo->lock); |
313 | ||
ee999d8b JE |
314 | hinfo->pde = proc_create_data(minfo->name, 0, |
315 | (family == NFPROTO_IPV4) ? | |
e89fc3f1 | 316 | hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit, |
ee999d8b | 317 | &dl_file_ops, hinfo); |
09e410de JE |
318 | if (hinfo->pde == NULL) { |
319 | vfree(hinfo); | |
320 | return -1; | |
321 | } | |
e89fc3f1 | 322 | hinfo->net = net; |
09e410de JE |
323 | |
324 | setup_timer(&hinfo->timer, htable_gc, (unsigned long)hinfo); | |
325 | hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); | |
326 | add_timer(&hinfo->timer); | |
327 | ||
e89fc3f1 | 328 | hlist_add_head(&hinfo->node, &hashlimit_net->htables); |
09e410de JE |
329 | |
330 | return 0; | |
331 | } | |
332 | ||
a47362a2 JE |
333 | static bool select_all(const struct xt_hashlimit_htable *ht, |
334 | const struct dsthash_ent *he) | |
1da177e4 LT |
335 | { |
336 | return 1; | |
337 | } | |
338 | ||
a47362a2 JE |
339 | static bool select_gc(const struct xt_hashlimit_htable *ht, |
340 | const struct dsthash_ent *he) | |
1da177e4 | 341 | { |
cbebc51f | 342 | return time_after_eq(jiffies, he->expires); |
1da177e4 LT |
343 | } |
344 | ||
39b46fc6 | 345 | static void htable_selective_cleanup(struct xt_hashlimit_htable *ht, |
a47362a2 JE |
346 | bool (*select)(const struct xt_hashlimit_htable *ht, |
347 | const struct dsthash_ent *he)) | |
1da177e4 | 348 | { |
39b46fc6 | 349 | unsigned int i; |
1da177e4 LT |
350 | |
351 | /* lock hash table and iterate over it */ | |
352 | spin_lock_bh(&ht->lock); | |
353 | for (i = 0; i < ht->cfg.size; i++) { | |
354 | struct dsthash_ent *dh; | |
355 | struct hlist_node *pos, *n; | |
356 | hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) { | |
357 | if ((*select)(ht, dh)) | |
39b46fc6 | 358 | dsthash_free(ht, dh); |
1da177e4 LT |
359 | } |
360 | } | |
361 | spin_unlock_bh(&ht->lock); | |
362 | } | |
363 | ||
364 | /* hash table garbage collector, run by timer */ | |
365 | static void htable_gc(unsigned long htlong) | |
366 | { | |
39b46fc6 | 367 | struct xt_hashlimit_htable *ht = (struct xt_hashlimit_htable *)htlong; |
1da177e4 LT |
368 | |
369 | htable_selective_cleanup(ht, select_gc); | |
370 | ||
371 | /* re-add the timer accordingly */ | |
372 | ht->timer.expires = jiffies + msecs_to_jiffies(ht->cfg.gc_interval); | |
373 | add_timer(&ht->timer); | |
374 | } | |
375 | ||
39b46fc6 | 376 | static void htable_destroy(struct xt_hashlimit_htable *hinfo) |
1da177e4 | 377 | { |
e89fc3f1 AD |
378 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(hinfo->net); |
379 | struct proc_dir_entry *parent; | |
380 | ||
967ab999 | 381 | del_timer_sync(&hinfo->timer); |
1da177e4 | 382 | |
e89fc3f1 AD |
383 | if (hinfo->family == NFPROTO_IPV4) |
384 | parent = hashlimit_net->ipt_hashlimit; | |
385 | else | |
386 | parent = hashlimit_net->ip6t_hashlimit; | |
387 | remove_proc_entry(hinfo->pde->name, parent); | |
1da177e4 LT |
388 | htable_selective_cleanup(hinfo, select_all); |
389 | vfree(hinfo); | |
390 | } | |
391 | ||
e89fc3f1 AD |
392 | static struct xt_hashlimit_htable *htable_find_get(struct net *net, |
393 | const char *name, | |
76108cea | 394 | u_int8_t family) |
1da177e4 | 395 | { |
e89fc3f1 | 396 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
39b46fc6 | 397 | struct xt_hashlimit_htable *hinfo; |
1da177e4 LT |
398 | struct hlist_node *pos; |
399 | ||
e89fc3f1 | 400 | hlist_for_each_entry(hinfo, pos, &hashlimit_net->htables, node) { |
39b46fc6 PM |
401 | if (!strcmp(name, hinfo->pde->name) && |
402 | hinfo->family == family) { | |
2eff25c1 | 403 | hinfo->use++; |
1da177e4 LT |
404 | return hinfo; |
405 | } | |
406 | } | |
1da177e4 LT |
407 | return NULL; |
408 | } | |
409 | ||
39b46fc6 | 410 | static void htable_put(struct xt_hashlimit_htable *hinfo) |
1da177e4 | 411 | { |
2eff25c1 PM |
412 | mutex_lock(&hashlimit_mutex); |
413 | if (--hinfo->use == 0) { | |
1da177e4 | 414 | hlist_del(&hinfo->node); |
1da177e4 LT |
415 | htable_destroy(hinfo); |
416 | } | |
2eff25c1 | 417 | mutex_unlock(&hashlimit_mutex); |
1da177e4 LT |
418 | } |
419 | ||
1da177e4 LT |
420 | /* The algorithm used is the Simple Token Bucket Filter (TBF) |
421 | * see net/sched/sch_tbf.c in the linux source tree | |
422 | */ | |
423 | ||
424 | /* Rusty: This is my (non-mathematically-inclined) understanding of | |
425 | this algorithm. The `average rate' in jiffies becomes your initial | |
426 | amount of credit `credit' and the most credit you can ever have | |
427 | `credit_cap'. The `peak rate' becomes the cost of passing the | |
428 | test, `cost'. | |
429 | ||
430 | `prev' tracks the last packet hit: you gain one credit per jiffy. | |
431 | If you get credit balance more than this, the extra credit is | |
432 | discarded. Every time the match passes, you lose `cost' credits; | |
433 | if you don't have that many, the test fails. | |
434 | ||
435 | See Alexey's formal explanation in net/sched/sch_tbf.c. | |
436 | ||
437 | To get the maximum range, we multiply by this factor (ie. you get N | |
438 | credits per jiffy). We want to allow a rate as low as 1 per day | |
439 | (slowest userspace tool allows), which means | |
440 | CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie. | |
441 | */ | |
442 | #define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24)) | |
443 | ||
444 | /* Repeated shift and or gives us all 1s, final shift and add 1 gives | |
445 | * us the power of 2 below the theoretical max, so GCC simply does a | |
446 | * shift. */ | |
447 | #define _POW2_BELOW2(x) ((x)|((x)>>1)) | |
448 | #define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2)) | |
449 | #define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4)) | |
450 | #define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8)) | |
451 | #define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16)) | |
452 | #define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1) | |
453 | ||
454 | #define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ) | |
455 | ||
456 | /* Precision saver. */ | |
457 | static inline u_int32_t | |
458 | user2credits(u_int32_t user) | |
459 | { | |
460 | /* If multiplying would overflow... */ | |
461 | if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY)) | |
462 | /* Divide first. */ | |
39b46fc6 | 463 | return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY; |
1da177e4 | 464 | |
39b46fc6 | 465 | return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE; |
1da177e4 LT |
466 | } |
467 | ||
468 | static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now) | |
469 | { | |
39b46fc6 | 470 | dh->rateinfo.credit += (now - dh->rateinfo.prev) * CREDITS_PER_JIFFY; |
1da177e4 LT |
471 | if (dh->rateinfo.credit > dh->rateinfo.credit_cap) |
472 | dh->rateinfo.credit = dh->rateinfo.credit_cap; | |
39b46fc6 PM |
473 | dh->rateinfo.prev = now; |
474 | } | |
475 | ||
09e410de JE |
476 | static inline __be32 maskl(__be32 a, unsigned int l) |
477 | { | |
1b9b70ea | 478 | return l ? htonl(ntohl(a) & ~0 << (32 - l)) : 0; |
09e410de JE |
479 | } |
480 | ||
3ed5df44 | 481 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
09e410de JE |
482 | static void hashlimit_ipv6_mask(__be32 *i, unsigned int p) |
483 | { | |
484 | switch (p) { | |
1b9b70ea | 485 | case 0 ... 31: |
09e410de JE |
486 | i[0] = maskl(i[0], p); |
487 | i[1] = i[2] = i[3] = 0; | |
488 | break; | |
1b9b70ea | 489 | case 32 ... 63: |
09e410de JE |
490 | i[1] = maskl(i[1], p - 32); |
491 | i[2] = i[3] = 0; | |
492 | break; | |
1b9b70ea | 493 | case 64 ... 95: |
09e410de JE |
494 | i[2] = maskl(i[2], p - 64); |
495 | i[3] = 0; | |
1b9b70ea | 496 | case 96 ... 127: |
09e410de JE |
497 | i[3] = maskl(i[3], p - 96); |
498 | break; | |
499 | case 128: | |
500 | break; | |
501 | } | |
502 | } | |
3ed5df44 | 503 | #endif |
09e410de | 504 | |
39b46fc6 | 505 | static int |
a47362a2 JE |
506 | hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo, |
507 | struct dsthash_dst *dst, | |
39b46fc6 PM |
508 | const struct sk_buff *skb, unsigned int protoff) |
509 | { | |
510 | __be16 _ports[2], *ports; | |
193b23c5 | 511 | u8 nexthdr; |
39b46fc6 PM |
512 | |
513 | memset(dst, 0, sizeof(*dst)); | |
514 | ||
515 | switch (hinfo->family) { | |
ee999d8b | 516 | case NFPROTO_IPV4: |
39b46fc6 | 517 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) |
09e410de JE |
518 | dst->ip.dst = maskl(ip_hdr(skb)->daddr, |
519 | hinfo->cfg.dstmask); | |
39b46fc6 | 520 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) |
09e410de JE |
521 | dst->ip.src = maskl(ip_hdr(skb)->saddr, |
522 | hinfo->cfg.srcmask); | |
39b46fc6 PM |
523 | |
524 | if (!(hinfo->cfg.mode & | |
525 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) | |
526 | return 0; | |
eddc9ec5 | 527 | nexthdr = ip_hdr(skb)->protocol; |
39b46fc6 | 528 | break; |
02dba025 | 529 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
ee999d8b | 530 | case NFPROTO_IPV6: |
09e410de JE |
531 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) { |
532 | memcpy(&dst->ip6.dst, &ipv6_hdr(skb)->daddr, | |
533 | sizeof(dst->ip6.dst)); | |
534 | hashlimit_ipv6_mask(dst->ip6.dst, hinfo->cfg.dstmask); | |
535 | } | |
536 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) { | |
537 | memcpy(&dst->ip6.src, &ipv6_hdr(skb)->saddr, | |
538 | sizeof(dst->ip6.src)); | |
539 | hashlimit_ipv6_mask(dst->ip6.src, hinfo->cfg.srcmask); | |
540 | } | |
39b46fc6 PM |
541 | |
542 | if (!(hinfo->cfg.mode & | |
543 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) | |
544 | return 0; | |
193b23c5 PM |
545 | nexthdr = ipv6_hdr(skb)->nexthdr; |
546 | protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); | |
547 | if ((int)protoff < 0) | |
39b46fc6 PM |
548 | return -1; |
549 | break; | |
550 | #endif | |
551 | default: | |
552 | BUG(); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | switch (nexthdr) { | |
557 | case IPPROTO_TCP: | |
558 | case IPPROTO_UDP: | |
a8d0f952 | 559 | case IPPROTO_UDPLITE: |
39b46fc6 PM |
560 | case IPPROTO_SCTP: |
561 | case IPPROTO_DCCP: | |
562 | ports = skb_header_pointer(skb, protoff, sizeof(_ports), | |
563 | &_ports); | |
564 | break; | |
565 | default: | |
566 | _ports[0] = _ports[1] = 0; | |
567 | ports = _ports; | |
568 | break; | |
569 | } | |
570 | if (!ports) | |
571 | return -1; | |
572 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SPT) | |
573 | dst->src_port = ports[0]; | |
574 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DPT) | |
575 | dst->dst_port = ports[1]; | |
576 | return 0; | |
1da177e4 LT |
577 | } |
578 | ||
1d93a9cb | 579 | static bool |
f7108a20 | 580 | hashlimit_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 581 | { |
28337ff5 | 582 | const struct xt_hashlimit_info *r = par->matchinfo; |
39b46fc6 | 583 | struct xt_hashlimit_htable *hinfo = r->hinfo; |
1da177e4 LT |
584 | unsigned long now = jiffies; |
585 | struct dsthash_ent *dh; | |
586 | struct dsthash_dst dst; | |
587 | ||
f7108a20 | 588 | if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0) |
39b46fc6 | 589 | goto hotdrop; |
1da177e4 LT |
590 | |
591 | spin_lock_bh(&hinfo->lock); | |
39b46fc6 | 592 | dh = dsthash_find(hinfo, &dst); |
1da177e4 | 593 | if (!dh) { |
39b46fc6 | 594 | dh = dsthash_alloc_init(hinfo, &dst); |
1da177e4 | 595 | if (!dh) { |
1da177e4 | 596 | spin_unlock_bh(&hinfo->lock); |
39b46fc6 | 597 | goto hotdrop; |
1da177e4 LT |
598 | } |
599 | ||
600 | dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire); | |
1da177e4 | 601 | dh->rateinfo.prev = jiffies; |
39b46fc6 PM |
602 | dh->rateinfo.credit = user2credits(hinfo->cfg.avg * |
603 | hinfo->cfg.burst); | |
604 | dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * | |
605 | hinfo->cfg.burst); | |
1da177e4 | 606 | dh->rateinfo.cost = user2credits(hinfo->cfg.avg); |
1c7628bd PM |
607 | } else { |
608 | /* update expiration timeout */ | |
609 | dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire); | |
610 | rateinfo_recalc(dh, now); | |
1da177e4 LT |
611 | } |
612 | ||
1da177e4 LT |
613 | if (dh->rateinfo.credit >= dh->rateinfo.cost) { |
614 | /* We're underlimit. */ | |
615 | dh->rateinfo.credit -= dh->rateinfo.cost; | |
616 | spin_unlock_bh(&hinfo->lock); | |
1d93a9cb | 617 | return true; |
1da177e4 LT |
618 | } |
619 | ||
601e68e1 | 620 | spin_unlock_bh(&hinfo->lock); |
1da177e4 LT |
621 | |
622 | /* default case: we're overlimit, thus don't match */ | |
1d93a9cb | 623 | return false; |
39b46fc6 PM |
624 | |
625 | hotdrop: | |
f7108a20 | 626 | *par->hotdrop = true; |
1d93a9cb | 627 | return false; |
1da177e4 LT |
628 | } |
629 | ||
ccb79bdc | 630 | static bool |
f7108a20 | 631 | hashlimit_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
09e410de | 632 | { |
f7108a20 | 633 | const struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
09e410de JE |
634 | struct xt_hashlimit_htable *hinfo = info->hinfo; |
635 | unsigned long now = jiffies; | |
636 | struct dsthash_ent *dh; | |
637 | struct dsthash_dst dst; | |
638 | ||
f7108a20 | 639 | if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0) |
09e410de JE |
640 | goto hotdrop; |
641 | ||
642 | spin_lock_bh(&hinfo->lock); | |
643 | dh = dsthash_find(hinfo, &dst); | |
644 | if (dh == NULL) { | |
645 | dh = dsthash_alloc_init(hinfo, &dst); | |
646 | if (dh == NULL) { | |
647 | spin_unlock_bh(&hinfo->lock); | |
648 | goto hotdrop; | |
649 | } | |
650 | ||
651 | dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire); | |
652 | dh->rateinfo.prev = jiffies; | |
653 | dh->rateinfo.credit = user2credits(hinfo->cfg.avg * | |
654 | hinfo->cfg.burst); | |
655 | dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * | |
656 | hinfo->cfg.burst); | |
657 | dh->rateinfo.cost = user2credits(hinfo->cfg.avg); | |
658 | } else { | |
659 | /* update expiration timeout */ | |
660 | dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire); | |
661 | rateinfo_recalc(dh, now); | |
662 | } | |
663 | ||
664 | if (dh->rateinfo.credit >= dh->rateinfo.cost) { | |
665 | /* below the limit */ | |
666 | dh->rateinfo.credit -= dh->rateinfo.cost; | |
667 | spin_unlock_bh(&hinfo->lock); | |
668 | return !(info->cfg.mode & XT_HASHLIMIT_INVERT); | |
669 | } | |
670 | ||
671 | spin_unlock_bh(&hinfo->lock); | |
672 | /* default match is underlimit - so over the limit, we need to invert */ | |
673 | return info->cfg.mode & XT_HASHLIMIT_INVERT; | |
674 | ||
675 | hotdrop: | |
f7108a20 | 676 | *par->hotdrop = true; |
09e410de JE |
677 | return false; |
678 | } | |
679 | ||
9b4fce7a | 680 | static bool hashlimit_mt_check_v0(const struct xt_mtchk_param *par) |
1da177e4 | 681 | { |
e89fc3f1 | 682 | struct net *net = par->net; |
9b4fce7a | 683 | struct xt_hashlimit_info *r = par->matchinfo; |
1da177e4 | 684 | |
1da177e4 | 685 | /* Check for overflow. */ |
39b46fc6 PM |
686 | if (r->cfg.burst == 0 || |
687 | user2credits(r->cfg.avg * r->cfg.burst) < user2credits(r->cfg.avg)) { | |
688 | printk(KERN_ERR "xt_hashlimit: overflow, try lower: %u/%u\n", | |
1da177e4 | 689 | r->cfg.avg, r->cfg.burst); |
ccb79bdc | 690 | return false; |
1da177e4 | 691 | } |
39b46fc6 PM |
692 | if (r->cfg.mode == 0 || |
693 | r->cfg.mode > (XT_HASHLIMIT_HASH_DPT | | |
694 | XT_HASHLIMIT_HASH_DIP | | |
695 | XT_HASHLIMIT_HASH_SIP | | |
696 | XT_HASHLIMIT_HASH_SPT)) | |
ccb79bdc | 697 | return false; |
1da177e4 | 698 | if (!r->cfg.gc_interval) |
ccb79bdc | 699 | return false; |
1da177e4 | 700 | if (!r->cfg.expire) |
ccb79bdc | 701 | return false; |
3ab72088 | 702 | if (r->name[sizeof(r->name) - 1] != '\0') |
ccb79bdc | 703 | return false; |
3ab72088 | 704 | |
2eff25c1 | 705 | mutex_lock(&hashlimit_mutex); |
e89fc3f1 AD |
706 | r->hinfo = htable_find_get(net, r->name, par->match->family); |
707 | if (!r->hinfo && htable_create_v0(net, r, par->match->family) != 0) { | |
2eff25c1 | 708 | mutex_unlock(&hashlimit_mutex); |
ccb79bdc | 709 | return false; |
1da177e4 | 710 | } |
2eff25c1 | 711 | mutex_unlock(&hashlimit_mutex); |
1da177e4 | 712 | |
ccb79bdc | 713 | return true; |
1da177e4 LT |
714 | } |
715 | ||
9b4fce7a | 716 | static bool hashlimit_mt_check(const struct xt_mtchk_param *par) |
09e410de | 717 | { |
e89fc3f1 | 718 | struct net *net = par->net; |
9b4fce7a | 719 | struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
09e410de JE |
720 | |
721 | /* Check for overflow. */ | |
722 | if (info->cfg.burst == 0 || | |
723 | user2credits(info->cfg.avg * info->cfg.burst) < | |
724 | user2credits(info->cfg.avg)) { | |
725 | printk(KERN_ERR "xt_hashlimit: overflow, try lower: %u/%u\n", | |
726 | info->cfg.avg, info->cfg.burst); | |
727 | return false; | |
728 | } | |
729 | if (info->cfg.gc_interval == 0 || info->cfg.expire == 0) | |
730 | return false; | |
731 | if (info->name[sizeof(info->name)-1] != '\0') | |
732 | return false; | |
9b4fce7a | 733 | if (par->match->family == NFPROTO_IPV4) { |
09e410de JE |
734 | if (info->cfg.srcmask > 32 || info->cfg.dstmask > 32) |
735 | return false; | |
736 | } else { | |
737 | if (info->cfg.srcmask > 128 || info->cfg.dstmask > 128) | |
738 | return false; | |
739 | } | |
740 | ||
2eff25c1 | 741 | mutex_lock(&hashlimit_mutex); |
e89fc3f1 AD |
742 | info->hinfo = htable_find_get(net, info->name, par->match->family); |
743 | if (!info->hinfo && htable_create(net, info, par->match->family) != 0) { | |
2eff25c1 | 744 | mutex_unlock(&hashlimit_mutex); |
09e410de JE |
745 | return false; |
746 | } | |
2eff25c1 | 747 | mutex_unlock(&hashlimit_mutex); |
09e410de JE |
748 | return true; |
749 | } | |
750 | ||
1da177e4 | 751 | static void |
6be3d859 | 752 | hashlimit_mt_destroy_v0(const struct xt_mtdtor_param *par) |
1da177e4 | 753 | { |
6be3d859 | 754 | const struct xt_hashlimit_info *r = par->matchinfo; |
1da177e4 LT |
755 | |
756 | htable_put(r->hinfo); | |
757 | } | |
758 | ||
6be3d859 | 759 | static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par) |
09e410de | 760 | { |
6be3d859 | 761 | const struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
09e410de JE |
762 | |
763 | htable_put(info->hinfo); | |
764 | } | |
765 | ||
127f15dd | 766 | #ifdef CONFIG_COMPAT |
39b46fc6 | 767 | struct compat_xt_hashlimit_info { |
127f15dd PM |
768 | char name[IFNAMSIZ]; |
769 | struct hashlimit_cfg cfg; | |
770 | compat_uptr_t hinfo; | |
771 | compat_uptr_t master; | |
772 | }; | |
773 | ||
739674fb | 774 | static void hashlimit_mt_compat_from_user(void *dst, const void *src) |
127f15dd | 775 | { |
39b46fc6 | 776 | int off = offsetof(struct compat_xt_hashlimit_info, hinfo); |
127f15dd PM |
777 | |
778 | memcpy(dst, src, off); | |
39b46fc6 | 779 | memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off); |
127f15dd PM |
780 | } |
781 | ||
739674fb | 782 | static int hashlimit_mt_compat_to_user(void __user *dst, const void *src) |
127f15dd | 783 | { |
39b46fc6 | 784 | int off = offsetof(struct compat_xt_hashlimit_info, hinfo); |
127f15dd PM |
785 | |
786 | return copy_to_user(dst, src, off) ? -EFAULT : 0; | |
787 | } | |
788 | #endif | |
789 | ||
d3c5ee6d | 790 | static struct xt_match hashlimit_mt_reg[] __read_mostly = { |
39b46fc6 PM |
791 | { |
792 | .name = "hashlimit", | |
09e410de | 793 | .revision = 0, |
ee999d8b | 794 | .family = NFPROTO_IPV4, |
09e410de | 795 | .match = hashlimit_mt_v0, |
39b46fc6 PM |
796 | .matchsize = sizeof(struct xt_hashlimit_info), |
797 | #ifdef CONFIG_COMPAT | |
798 | .compatsize = sizeof(struct compat_xt_hashlimit_info), | |
d3c5ee6d JE |
799 | .compat_from_user = hashlimit_mt_compat_from_user, |
800 | .compat_to_user = hashlimit_mt_compat_to_user, | |
39b46fc6 | 801 | #endif |
09e410de JE |
802 | .checkentry = hashlimit_mt_check_v0, |
803 | .destroy = hashlimit_mt_destroy_v0, | |
39b46fc6 PM |
804 | .me = THIS_MODULE |
805 | }, | |
09e410de JE |
806 | { |
807 | .name = "hashlimit", | |
808 | .revision = 1, | |
ee999d8b | 809 | .family = NFPROTO_IPV4, |
09e410de JE |
810 | .match = hashlimit_mt, |
811 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), | |
812 | .checkentry = hashlimit_mt_check, | |
813 | .destroy = hashlimit_mt_destroy, | |
814 | .me = THIS_MODULE, | |
815 | }, | |
7b21e09d | 816 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 PM |
817 | { |
818 | .name = "hashlimit", | |
ee999d8b | 819 | .family = NFPROTO_IPV6, |
09e410de | 820 | .match = hashlimit_mt_v0, |
39b46fc6 | 821 | .matchsize = sizeof(struct xt_hashlimit_info), |
127f15dd | 822 | #ifdef CONFIG_COMPAT |
39b46fc6 | 823 | .compatsize = sizeof(struct compat_xt_hashlimit_info), |
d3c5ee6d JE |
824 | .compat_from_user = hashlimit_mt_compat_from_user, |
825 | .compat_to_user = hashlimit_mt_compat_to_user, | |
127f15dd | 826 | #endif |
09e410de JE |
827 | .checkentry = hashlimit_mt_check_v0, |
828 | .destroy = hashlimit_mt_destroy_v0, | |
39b46fc6 PM |
829 | .me = THIS_MODULE |
830 | }, | |
09e410de JE |
831 | { |
832 | .name = "hashlimit", | |
833 | .revision = 1, | |
ee999d8b | 834 | .family = NFPROTO_IPV6, |
09e410de JE |
835 | .match = hashlimit_mt, |
836 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), | |
837 | .checkentry = hashlimit_mt_check, | |
838 | .destroy = hashlimit_mt_destroy, | |
839 | .me = THIS_MODULE, | |
840 | }, | |
7b21e09d | 841 | #endif |
1da177e4 LT |
842 | }; |
843 | ||
844 | /* PROC stuff */ | |
1da177e4 | 845 | static void *dl_seq_start(struct seq_file *s, loff_t *pos) |
f4f6fb71 | 846 | __acquires(htable->lock) |
1da177e4 | 847 | { |
a1004d8e | 848 | struct xt_hashlimit_htable *htable = s->private; |
1da177e4 LT |
849 | unsigned int *bucket; |
850 | ||
851 | spin_lock_bh(&htable->lock); | |
852 | if (*pos >= htable->cfg.size) | |
853 | return NULL; | |
854 | ||
855 | bucket = kmalloc(sizeof(unsigned int), GFP_ATOMIC); | |
856 | if (!bucket) | |
857 | return ERR_PTR(-ENOMEM); | |
858 | ||
859 | *bucket = *pos; | |
860 | return bucket; | |
861 | } | |
862 | ||
863 | static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
864 | { | |
a1004d8e | 865 | struct xt_hashlimit_htable *htable = s->private; |
1da177e4 LT |
866 | unsigned int *bucket = (unsigned int *)v; |
867 | ||
868 | *pos = ++(*bucket); | |
869 | if (*pos >= htable->cfg.size) { | |
870 | kfree(v); | |
871 | return NULL; | |
872 | } | |
873 | return bucket; | |
874 | } | |
875 | ||
876 | static void dl_seq_stop(struct seq_file *s, void *v) | |
f4f6fb71 | 877 | __releases(htable->lock) |
1da177e4 | 878 | { |
a1004d8e | 879 | struct xt_hashlimit_htable *htable = s->private; |
1da177e4 LT |
880 | unsigned int *bucket = (unsigned int *)v; |
881 | ||
55e0d7cf ED |
882 | if (!IS_ERR(bucket)) |
883 | kfree(bucket); | |
1da177e4 LT |
884 | spin_unlock_bh(&htable->lock); |
885 | } | |
886 | ||
76108cea | 887 | static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family, |
39b46fc6 | 888 | struct seq_file *s) |
1da177e4 LT |
889 | { |
890 | /* recalculate to show accurate numbers */ | |
891 | rateinfo_recalc(ent, jiffies); | |
892 | ||
39b46fc6 | 893 | switch (family) { |
ee999d8b | 894 | case NFPROTO_IPV4: |
14d5e834 | 895 | return seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n", |
39b46fc6 | 896 | (long)(ent->expires - jiffies)/HZ, |
14d5e834 | 897 | &ent->dst.ip.src, |
39b46fc6 | 898 | ntohs(ent->dst.src_port), |
14d5e834 | 899 | &ent->dst.ip.dst, |
39b46fc6 PM |
900 | ntohs(ent->dst.dst_port), |
901 | ent->rateinfo.credit, ent->rateinfo.credit_cap, | |
902 | ent->rateinfo.cost); | |
7b21e09d | 903 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
ee999d8b | 904 | case NFPROTO_IPV6: |
5b095d98 | 905 | return seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n", |
39b46fc6 | 906 | (long)(ent->expires - jiffies)/HZ, |
38ff4fa4 | 907 | &ent->dst.ip6.src, |
39b46fc6 | 908 | ntohs(ent->dst.src_port), |
38ff4fa4 | 909 | &ent->dst.ip6.dst, |
39b46fc6 PM |
910 | ntohs(ent->dst.dst_port), |
911 | ent->rateinfo.credit, ent->rateinfo.credit_cap, | |
912 | ent->rateinfo.cost); | |
7b21e09d | 913 | #endif |
39b46fc6 PM |
914 | default: |
915 | BUG(); | |
916 | return 0; | |
917 | } | |
1da177e4 LT |
918 | } |
919 | ||
920 | static int dl_seq_show(struct seq_file *s, void *v) | |
921 | { | |
a1004d8e | 922 | struct xt_hashlimit_htable *htable = s->private; |
1da177e4 LT |
923 | unsigned int *bucket = (unsigned int *)v; |
924 | struct dsthash_ent *ent; | |
925 | struct hlist_node *pos; | |
926 | ||
39b46fc6 PM |
927 | if (!hlist_empty(&htable->hash[*bucket])) { |
928 | hlist_for_each_entry(ent, pos, &htable->hash[*bucket], node) | |
929 | if (dl_seq_real_show(ent, htable->family, s)) | |
683a04ce | 930 | return -1; |
39b46fc6 | 931 | } |
1da177e4 LT |
932 | return 0; |
933 | } | |
934 | ||
56b3d975 | 935 | static const struct seq_operations dl_seq_ops = { |
1da177e4 LT |
936 | .start = dl_seq_start, |
937 | .next = dl_seq_next, | |
938 | .stop = dl_seq_stop, | |
939 | .show = dl_seq_show | |
940 | }; | |
941 | ||
942 | static int dl_proc_open(struct inode *inode, struct file *file) | |
943 | { | |
944 | int ret = seq_open(file, &dl_seq_ops); | |
945 | ||
946 | if (!ret) { | |
947 | struct seq_file *sf = file->private_data; | |
a1004d8e | 948 | sf->private = PDE(inode)->data; |
1da177e4 LT |
949 | } |
950 | return ret; | |
951 | } | |
952 | ||
da7071d7 | 953 | static const struct file_operations dl_file_ops = { |
1da177e4 LT |
954 | .owner = THIS_MODULE, |
955 | .open = dl_proc_open, | |
956 | .read = seq_read, | |
957 | .llseek = seq_lseek, | |
958 | .release = seq_release | |
959 | }; | |
960 | ||
e89fc3f1 AD |
961 | static int __net_init hashlimit_proc_net_init(struct net *net) |
962 | { | |
963 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); | |
964 | ||
965 | hashlimit_net->ipt_hashlimit = proc_mkdir("ipt_hashlimit", net->proc_net); | |
966 | if (!hashlimit_net->ipt_hashlimit) | |
967 | return -ENOMEM; | |
968 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) | |
969 | hashlimit_net->ip6t_hashlimit = proc_mkdir("ip6t_hashlimit", net->proc_net); | |
970 | if (!hashlimit_net->ip6t_hashlimit) { | |
971 | proc_net_remove(net, "ipt_hashlimit"); | |
972 | return -ENOMEM; | |
973 | } | |
974 | #endif | |
975 | return 0; | |
976 | } | |
977 | ||
978 | static void __net_exit hashlimit_proc_net_exit(struct net *net) | |
979 | { | |
980 | proc_net_remove(net, "ipt_hashlimit"); | |
981 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) | |
982 | proc_net_remove(net, "ip6t_hashlimit"); | |
983 | #endif | |
984 | } | |
985 | ||
986 | static int __net_init hashlimit_net_init(struct net *net) | |
987 | { | |
988 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); | |
989 | ||
990 | INIT_HLIST_HEAD(&hashlimit_net->htables); | |
991 | return hashlimit_proc_net_init(net); | |
992 | } | |
993 | ||
994 | static void __net_exit hashlimit_net_exit(struct net *net) | |
995 | { | |
996 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); | |
997 | ||
998 | BUG_ON(!hlist_empty(&hashlimit_net->htables)); | |
999 | hashlimit_proc_net_exit(net); | |
1000 | } | |
1001 | ||
1002 | static struct pernet_operations hashlimit_net_ops = { | |
1003 | .init = hashlimit_net_init, | |
1004 | .exit = hashlimit_net_exit, | |
1005 | .id = &hashlimit_net_id, | |
1006 | .size = sizeof(struct hashlimit_net), | |
1007 | }; | |
1008 | ||
d3c5ee6d | 1009 | static int __init hashlimit_mt_init(void) |
1da177e4 | 1010 | { |
39b46fc6 | 1011 | int err; |
1da177e4 | 1012 | |
e89fc3f1 AD |
1013 | err = register_pernet_subsys(&hashlimit_net_ops); |
1014 | if (err < 0) | |
1015 | return err; | |
d3c5ee6d JE |
1016 | err = xt_register_matches(hashlimit_mt_reg, |
1017 | ARRAY_SIZE(hashlimit_mt_reg)); | |
39b46fc6 PM |
1018 | if (err < 0) |
1019 | goto err1; | |
1da177e4 | 1020 | |
39b46fc6 PM |
1021 | err = -ENOMEM; |
1022 | hashlimit_cachep = kmem_cache_create("xt_hashlimit", | |
1023 | sizeof(struct dsthash_ent), 0, 0, | |
20c2df83 | 1024 | NULL); |
1da177e4 | 1025 | if (!hashlimit_cachep) { |
39b46fc6 PM |
1026 | printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n"); |
1027 | goto err2; | |
1da177e4 | 1028 | } |
e89fc3f1 AD |
1029 | return 0; |
1030 | ||
39b46fc6 | 1031 | err2: |
d3c5ee6d | 1032 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
39b46fc6 | 1033 | err1: |
e89fc3f1 | 1034 | unregister_pernet_subsys(&hashlimit_net_ops); |
39b46fc6 | 1035 | return err; |
1da177e4 | 1036 | |
1da177e4 LT |
1037 | } |
1038 | ||
d3c5ee6d | 1039 | static void __exit hashlimit_mt_exit(void) |
1da177e4 | 1040 | { |
39b46fc6 | 1041 | kmem_cache_destroy(hashlimit_cachep); |
d3c5ee6d | 1042 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
e89fc3f1 | 1043 | unregister_pernet_subsys(&hashlimit_net_ops); |
1da177e4 LT |
1044 | } |
1045 | ||
d3c5ee6d JE |
1046 | module_init(hashlimit_mt_init); |
1047 | module_exit(hashlimit_mt_exit); |